/* =====================================================================
   Phase 1: Design System Foundation — Token System
   "Pocket Language Journal" — warm paper textures, sage + beige palette
   ===================================================================== */
:root {
    /* --- Surface tokens --- */
    --surface-0: #FAFAF5;
    --surface-1: #F7F4EB;
    --surface-2: #ede6d9;
    --surface-3: #e0d6c5;
    --surface-raised: #ffffff;
    --surface-overlay: rgba(0, 0, 0, 0.5);

    /* --- Ink (text) tokens --- */
    --ink-900: #2d2d2d;
    --ink-800: #3d3d3d;
    --ink-700: #555555;
    --ink-600: #666666;
    --ink-500: #757575;
    --ink-400: #8a8a8a;
    --ink-300: #b0b0b0;

    /* --- Primary (sage green) --- */
    --primary-900: #3a5a3f;
    --primary-800: #436847;
    --primary-700: #4a6b50;
    --primary-600: #5a7a60;
    --primary-500: #6a8a70;
    --primary-400: #7a9980;
    --primary-300: #9fb5a4;
    --primary-200: #c5d3c8;
    --primary-100: #e0eae2;
    --primary-50: #f0f5f1;

    /* --- Accent (warm orange) --- */
    --accent-600: #d47a0a;
    --accent-500: #f7931e;
    --accent-400: #ffad42;
    --accent-300: #ffc872;
    --accent-200: #ffe0a8;
    --accent-100: #fff4e0;

    /* --- Semantic --- */
    --color-success: #22c55e;
    --color-success-soft: #dcfce7;
    --color-warning: #f59e0b;
    --color-warning-soft: #fef3c7;
    --color-error: #ef4444;
    --color-error-soft: #fee2e2;
    --color-info: #3b82f6;
    --color-info-soft: #dbeafe;

    /* --- Gold (gamification) --- */
    --gold-600: #b8860b;
    --gold-500: #d4a021;
    --gold-400: #f0c040;
    --gold-300: #ffd966;
    --gold-200: #ffe89a;
    --gold-100: #fff8e1;

    /* --- Stat backgrounds --- */
    --color-stat-blue: #f0f9ff;
    --color-stat-green: #f0fff4;
    --color-stat-orange: #fff8f0;
    --color-stat-red: #fef2f2;
    --color-stat-yellow: #fef3c7;

    /* --- Typography --- */
    --font-display: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Type scale (1.2 ratio) */
    --text-xs: 0.694rem;
    --text-sm: 0.833rem;
    --text-base: 1rem;
    --text-lg: 1.2rem;
    --text-xl: 1.44rem;
    --text-2xl: 1.728rem;
    --text-3xl: 2.074rem;
    --text-4xl: 2.488rem;
    --text-5xl: 3rem;

    /* Line heights */
    --leading-tight: 1.2;
    --leading-normal: 1.6;
    --leading-relaxed: 1.75;

    /* Letter spacing */
    --tracking-tight: -0.02em;
    --tracking-normal: 0;
    --tracking-wide: 0.02em;
    --tracking-caps: 0.08em;
    --tracking-display: -0.04em;

    /* --- Spacing scale --- */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-7: 32px;
    --space-8: 40px;
    --space-9: 48px;
    --space-10: 64px;
    --space-11: 80px;
    --space-12: 96px;

    /* --- Radius scale --- */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
    --radius-full: 100px;

    /* --- Shadows (warm-tinted) --- */
    --shadow-sm: 0 1px 3px rgba(60, 50, 30, 0.06), 0 1px 2px rgba(60, 50, 30, 0.04);
    --shadow-md: 0 4px 12px rgba(60, 50, 30, 0.08), 0 2px 4px rgba(60, 50, 30, 0.04);
    --shadow-lg: 0 10px 30px rgba(60, 50, 30, 0.1), 0 4px 8px rgba(60, 50, 30, 0.05);
    --shadow-glow-primary: 0 0 0 4px rgba(106, 138, 112, 0.15);
    --shadow-glow-accent: 0 0 0 4px rgba(247, 147, 30, 0.15);
    --shadow-glow-error: 0 0 0 4px rgba(239, 68, 68, 0.15);
    --shadow-glow-success: 0 0 0 4px rgba(34, 197, 94, 0.15);
    --primary-emerald: #2D6A4F;
    --shadow-glass: 0 8px 32px 0 rgba(31, 38, 135, 0.07);

    /* --- Spring easing --- */
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);

    /* --- Legacy aliases (for backward compat) --- */
    --color-beige-50: var(--surface-0);
    --color-beige-100: var(--surface-1);
    --color-beige-200: var(--surface-2);
    --color-beige-300: var(--surface-3);
    --color-beige-400: #c2a987;
    --color-sage-100: var(--primary-100);
    --color-sage-200: var(--primary-200);
    --color-sage-300: var(--primary-300);
    --color-sage-400: var(--primary-400);
    --color-sage-500: var(--primary-600);
    --color-text: var(--ink-800);
    --color-text-light: var(--ink-600);
    --color-text-muted: var(--ink-500);
    --color-white: var(--surface-raised);
    --color-border: #e5e0d8;
    --color-primary: var(--primary-700);
    --color-accent: var(--accent-500);
    --font-display-legacy: var(--font-display);
    --font-body-legacy: var(--font-body);
}

/* =====================================================================
   Phase 1.2: Dark Mode
   Nature-tinted darks (green/beige undertones, not grey)
   ===================================================================== */
[data-tg-color-scheme="dark"] {
    --surface-0: #1a1f1b;
    --surface-1: #222823;
    --surface-2: #2e3630;
    --surface-3: #3b453d;
    --surface-raised: #252b26;
    --surface-overlay: rgba(0, 0, 0, 0.65);

    --ink-900: #f0f0f0;
    --ink-800: #e0e0e0;
    --ink-700: #c8c8c8;
    --ink-600: #aaaaaa;
    --ink-500: #8a8a8a;
    --ink-400: #6e6e6e;
    --ink-300: #555555;

    --primary-900: #8fc898;
    --primary-800: #7ab884;
    --primary-700: #6ea878;
    --primary-600: #5a8a62;
    --primary-500: #4a7a52;
    --primary-400: #3d6844;
    --primary-300: #305538;
    --primary-200: #2a4530;
    --primary-100: #1e3524;
    --primary-50: #162618;

    --accent-600: #ffad42;
    --accent-500: #f7931e;
    --accent-400: #d47a0a;
    --accent-300: #a86108;
    --accent-200: #3d2e10;
    --accent-100: #2d2518;

    --color-success: #4ade80;
    --color-success-soft: #1a2b1e;
    --color-warning: #fbbf24;
    --color-warning-soft: #2b2718;
    --color-error: #f87171;
    --color-error-soft: #2b1a1a;
    --color-info: #60a5fa;
    --color-info-soft: #1a2332;

    --gold-600: #b8860b;
    --gold-500: #f0c040;
    --gold-400: #d4a021;
    --gold-100: #2b2510;

    --color-stat-blue: #1a2332;
    --color-stat-green: #1a2b1e;
    --color-stat-orange: #2b2318;
    --color-stat-red: #2b1a1a;
    --color-stat-yellow: #2b2718;

    --color-border: #3a4a3d;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.35);
    --shadow-glow-primary: 0 0 0 4px rgba(110, 168, 120, 0.2);
    --primary-emerald: #4ade80;
    --shadow-glass: 0 8px 32px 0 rgba(0, 0, 0, 0.2);
}

/* Browser dark mode fallback */
@media (prefers-color-scheme: dark) {
    :root:not([data-tg-color-scheme]) {
        --surface-0: #1a1f1b;
        --surface-1: #222823;
        --surface-2: #2e3630;
        --surface-3: #3b453d;
        --surface-raised: #252b26;
        --surface-overlay: rgba(0, 0, 0, 0.65);

        --ink-900: #f0f0f0;
        --ink-800: #e0e0e0;
        --ink-700: #c8c8c8;
        --ink-600: #aaaaaa;
        --ink-500: #8a8a8a;
        --ink-400: #6e6e6e;
        --ink-300: #555555;

        --primary-900: #8fc898;
        --primary-800: #7ab884;
        --primary-700: #6ea878;
        --primary-600: #5a8a62;
        --primary-500: #4a7a52;
        --primary-400: #3d6844;
        --primary-300: #305538;
        --primary-200: #2a4530;
        --primary-100: #1e3524;
        --primary-50: #162618;

        --accent-600: #ffad42;
        --accent-500: #f7931e;
        --accent-400: #d47a0a;

        --color-success: #4ade80;
        --color-success-soft: #1a2b1e;
        --color-warning: #fbbf24;
        --color-warning-soft: #2b2718;
        --color-error: #f87171;
        --color-error-soft: #2b1a1a;
        --color-info: #60a5fa;
        --color-info-soft: #1a2332;

        --gold-500: #f0c040;
        --gold-400: #d4a021;
        --gold-100: #2b2510;

        --color-stat-blue: #1a2332;
        --color-stat-green: #1a2b1e;
        --color-stat-orange: #2b2318;
        --color-stat-red: #2b1a1a;
        --color-stat-yellow: #2b2718;

        --color-border: #3a4a3d;

        --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
        --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.25);
        --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.35);
        --shadow-glow-primary: 0 0 0 4px rgba(110, 168, 120, 0.2);
        --primary-emerald: #4ade80;
        --shadow-glass: 0 8px 32px 0 rgba(0, 0, 0, 0.2);
    }
}

/* =====================================================================
   Base Styles
   ===================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--surface-0);
    font-family: var(--font-body);
    color: var(--ink-800);
    line-height: var(--leading-normal);
    font-size: var(--text-base);
    overflow-x: hidden;
    overscroll-behavior: contain;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body.modal-open {
    overflow: hidden;
}

/* =====================================================================
   Phase 2.1: Header & Navigation
   ===================================================================== */
.header {
    background: var(--surface-raised);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 50;
    padding: var(--space-3) var(--space-7);
    transition: box-shadow 0.3s ease;
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-link {
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    cursor: pointer;
    transition: opacity 0.2s ease;
}

.logo-link:hover {
    opacity: 0.8;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-700) 100%);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: var(--text-xl);
    font-family: var(--font-display);
}

.logo-text {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--ink-900);
    letter-spacing: var(--tracking-tight);
}

/* Credit chip in header */
.credit-chip {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-1) var(--space-3);
    background: var(--gold-100);
    color: var(--gold-500);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s ease;
}

.credit-chip:hover {
    background: var(--gold-200);
}

/* Desktop nav */
.nav {
    display: flex;
    gap: var(--space-2);
}

.nav-link {
    background: var(--primary-700);
    color: white;
    padding: var(--space-3) var(--space-5);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.2s var(--ease-spring), box-shadow 0.2s ease;
    text-decoration: none;
    border: none;
    font-family: var(--font-body);
    position: relative;
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.12) 0%, transparent 60%);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.nav-link:hover {
    background: var(--primary-800);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(74, 107, 80, 0.35);
}

.nav-link:hover::before {
    opacity: 1;
}

.nav-link:active {
    transform: translateY(0) scale(0.96);
    box-shadow: 0 2px 8px rgba(74, 107, 80, 0.2);
}

.nav-link.active {
    background: var(--primary-800);
    box-shadow: 0 2px 8px rgba(74, 107, 80, 0.3);
}

.nav-link:focus-visible {
    outline: none;
    box-shadow: var(--shadow-glow-primary);
}

/* Mobile Bottom Navigation — frosted glass */
.mobile-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.82);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-top: 1px solid rgba(0, 0, 0, 0.06);
    padding: var(--space-2) var(--space-4);
    padding-bottom: calc(var(--space-2) + env(safe-area-inset-bottom, 0px));
    z-index: 100;
}

[data-tg-color-scheme="dark"] .mobile-nav,
.dark .mobile-nav {
    background: rgba(26, 31, 27, 0.85);
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.mobile-nav-inner {
    display: flex;
    justify-content: space-around;
    align-items: center;
    max-width: 400px;
    margin: 0 auto;
}

.mobile-nav-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    text-decoration: none;
    color: var(--ink-500);
    font-size: var(--text-xs);
    font-weight: 500;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    transition: color 0.2s ease, transform 0.2s var(--ease-spring);
    cursor: pointer;
    background: none;
    border: none;
    position: relative;
    font-family: var(--font-body);
}

.mobile-nav-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 20px;
    height: 3px;
    background: var(--primary-600);
    border-radius: var(--radius-full);
    transition: transform 0.25s var(--ease-spring);
}

.mobile-nav-link.active {
    color: var(--primary-700);
}

.mobile-nav-link.active::before {
    transform: translateX(-50%) scaleX(1);
}

.mobile-nav-link:active {
    transform: scale(0.85);
}

.mobile-nav-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 2px;
}

.mobile-nav-icon svg {
    width: 22px;
    height: 22px;
    stroke-width: 2;
}

/* =====================================================================
   Phase 2.2: Buttons
   4 variants: primary, secondary, ghost, accent
   WCAG AA: white on --primary-700 (#4a6b50) = 5.2:1
   ===================================================================== */
.btn-primary {
    background: var(--primary-700);
    color: white;
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.2s var(--ease-spring), box-shadow 0.2s ease;
    font-family: var(--font-body);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, transparent 60%);
    pointer-events: none;
}

.btn-primary:hover {
    background: var(--primary-800);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(74, 107, 80, 0.3);
}

.btn-primary:active {
    transform: translateY(0) scale(0.96);
    box-shadow: 0 2px 8px rgba(74, 107, 80, 0.2);
}

.btn-primary:focus-visible {
    outline: none;
    box-shadow: var(--shadow-glow-primary);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
    pointer-events: none;
}

.btn-secondary {
    flex: 1;
    padding: var(--space-3);
    border: 1px solid var(--color-border);
    background: var(--surface-raised);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--ink-600);
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s var(--ease-spring), box-shadow 0.2s ease;
    font-family: var(--font-body);
}

.btn-secondary:hover {
    background: var(--surface-1);
    border-color: var(--primary-200);
    transform: translateY(-1px);
    box-shadow: 0 3px 12px rgba(0, 0, 0, 0.08);
}

.btn-secondary:active {
    transform: translateY(0) scale(0.96);
    box-shadow: none;
}

.btn-secondary:focus-visible {
    outline: none;
    box-shadow: var(--shadow-glow-primary);
}

.btn-ghost {
    padding: var(--space-3) var(--space-5);
    border: none;
    background: transparent;
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--ink-600);
    cursor: pointer;
    transition: background 0.2s ease, transform 0.2s var(--ease-spring);
    font-family: var(--font-body);
}

.btn-ghost:hover {
    background: var(--surface-1);
    transform: translateY(-1px);
}

.btn-ghost:active {
    transform: translateY(0) scale(0.96);
}

.btn-ghost:focus-visible {
    outline: none;
    box-shadow: var(--shadow-glow-primary);
}

.btn-accent {
    background: linear-gradient(135deg, var(--accent-500), var(--accent-600));
    color: white;
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: transform 0.2s var(--ease-spring), box-shadow 0.2s ease, filter 0.2s ease;
    font-family: var(--font-body);
}

.btn-accent:hover {
    filter: brightness(1.05);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.btn-accent:active {
    transform: translateY(0) scale(0.96);
}

.btn-accent:focus-visible {
    outline: none;
    box-shadow: var(--shadow-glow-accent);
}

/* Credits CTA button */
.btn-credits-cta {
    background: linear-gradient(135deg, var(--accent-500), var(--accent-600));
    color: white;
    border: none;
}

.btn-credits-cta:hover {
    background: linear-gradient(135deg, var(--accent-600), #c06a08);
}

/* Lucide icons inside buttons */
.btn-primary svg,
.btn-secondary svg,
.btn-accent svg,
.btn-ghost svg {
    width: 18px;
    height: 18px;
    stroke-width: 2.5;
    margin-right: 6px;
    display: inline-block;
    vertical-align: text-bottom;
}

/* =====================================================================
   Main Container
   ===================================================================== */
.main {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-8) var(--space-7);
}

/* =====================================================================
   Hero Section (legacy)
   ===================================================================== */
.hero {
    margin-bottom: var(--space-8);
}

.hero-title {
    font-family: var(--font-display);
    font-size: var(--text-4xl);
    font-weight: 700;
    line-height: var(--leading-tight);
    margin-bottom: var(--space-4);
    color: var(--ink-900);
    letter-spacing: var(--tracking-tight);
}

.hero-title span {
    color: var(--primary-600);
}

.hero-subtitle {
    font-size: var(--text-lg);
    color: var(--ink-600);
    max-width: 600px;
}

/* =====================================================================
   Phase 2.8: Stats Section — Pill-shaped chip filters
   ===================================================================== */
.stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-3);
    margin-bottom: var(--space-7);
}

.stat-card {
    background: var(--surface-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    cursor: pointer;
    transition: all 0.25s var(--ease-out);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-card.active {
    border-color: var(--primary-600);
    background: var(--primary-50);
}

.stat-card:last-child {
    cursor: default;
}

.stat-card:last-child:hover {
    transform: none;
    box-shadow: none;
}

.stat-value {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--ink-900);
}

.stat-value.accent {
    color: var(--primary-600);
}

.stat-label {
    font-size: var(--text-xs);
    color: var(--ink-500);
    text-transform: uppercase;
    letter-spacing: var(--tracking-caps);
    margin-top: var(--space-1);
}

.progress-bar {
    height: 4px;
    background: var(--surface-2);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-top: var(--space-2);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-300), var(--primary-600));
    transition: width 0.5s var(--ease-out);
    border-radius: var(--radius-full);
}

/* =====================================================================
   Card Search
   ===================================================================== */
.card-search-wrapper {
    margin-bottom: 1.25rem;
    padding: 0.75rem;
    background: var(--surface-1);
    border-radius: var(--radius-xl);
    border: 1.5px solid var(--color-border);
}
.card-search-input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    border: 1.5px solid var(--primary-300);
    border-radius: var(--radius-lg);
    background: var(--surface-0) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%239ca3af' viewBox='0 0 16 16'%3E%3Cpath d='M11.742 10.344a6.5 6.5 0 1 0-1.397 1.398l3.85 3.85a1 1 0 0 0 1.415-1.414l-3.85-3.85zm-5.242.156a5 5 0 1 1 0-10 5 5 0 0 1 0 10z'/%3E%3C/svg%3E") no-repeat 0.75rem center;
    font-family: var(--font-body);
    font-size: 0.875rem;
    color: var(--ink-900);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 0 0 1px rgba(122, 153, 128, 0.1);
}
.card-search-input:focus {
    outline: none;
    border-color: var(--primary-400);
    box-shadow: 0 0 0 3px rgba(122, 153, 128, 0.15);
}
.card-search-input::placeholder {
    color: var(--ink-500);
}

/* =====================================================================
   Flashcard Grid
   ===================================================================== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-6);
}

/* Phase 2.3: Flashcards — paper texture, status bar, spring flip */
.card-container {
    perspective: 1000px;
    min-height: 280px;
    animation: card-enter 0.4s var(--ease-out) both;
}

.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.55s var(--ease-spring);
    transform-style: preserve-3d;
    cursor: pointer;
}

.card-container.flipped .card-inner {
    transform: rotateY(180deg);
}

.card-front,
.card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: var(--space-7);
    overflow: hidden;
}

/* Paper texture overlay */
.card-front::before,
.card-back::before {
    content: '';
    position: absolute;
    inset: 0;
    opacity: 0.3;
    pointer-events: none;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
    border-radius: inherit;
}

.card-front {
    background: linear-gradient(145deg, var(--surface-raised) 0%, var(--surface-1) 100%);
}

.card-back {
    background: linear-gradient(145deg, var(--primary-50) 0%, var(--surface-raised) 100%);
    transform: rotateY(180deg);
    align-items: flex-start;
    text-align: left;
    overflow-y: auto;
}

/* Status bar at bottom instead of 8px dot */
.card-status-bar {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--surface-2);
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
    overflow: hidden;
}

.card-status-bar .card-status-fill {
    height: 100%;
    width: 0%;
    transition: width 0.4s var(--ease-out), background-color 0.3s ease;
    border-radius: inherit;
}

.card-container[data-status="new"] .card-status-fill {
    width: 0%;
    background: var(--surface-3);
}

.card-container[data-status="learning"] .card-status-fill {
    width: 50%;
    background: var(--accent-500);
}

.card-container[data-status="learned"] .card-status-fill {
    width: 100%;
    background: var(--color-success);
}

/* Legacy dot status (fallback) */
.card-status {
    position: absolute;
    top: var(--space-4);
    left: var(--space-4);
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--surface-3);
    display: none;
}

.card-status.learning {
    background: var(--accent-500);
}

.card-status.learned {
    background: var(--color-success);
}

.card-label {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--ink-400);
    text-transform: uppercase;
    letter-spacing: var(--tracking-caps);
}

.card-word {
    font-family: var(--font-display);
    font-size: var(--text-3xl);
    font-weight: 700;
    color: var(--ink-900);
    margin-bottom: var(--space-2);
    letter-spacing: var(--tracking-tight);
}

.card-transcription {
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    color: var(--ink-600);
}

.card-transcription-ru {
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    color: var(--ink-500);
    margin-top: var(--space-1);
}

.card-hint {
    margin-top: var(--space-6);
    padding: var(--space-2) var(--space-4);
    background: var(--surface-1);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    color: var(--ink-500);
    text-transform: uppercase;
    letter-spacing: var(--tracking-caps);
}

/* Desktop hover lift */
@media (hover: hover) {
    .card-container:hover .card-inner {
        transform: translateY(-4px);
        box-shadow: var(--shadow-lg);
    }

    .card-container.flipped:hover .card-inner {
        transform: rotateY(180deg) translateY(-4px);
    }
}

/* Card Back Content */
.card-back-content {
    width: 100%;
}

.card-section-label {
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--ink-500);
    text-transform: uppercase;
    letter-spacing: var(--tracking-caps);
    margin-bottom: var(--space-1);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.card-section-label::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--primary-600);
}

.card-translation {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--ink-900);
    margin-bottom: var(--space-6);
}

.card-association-label {
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--primary-600);
    text-transform: uppercase;
    letter-spacing: var(--tracking-caps);
    margin-bottom: var(--space-1);
}

.card-association {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--primary-600);
    margin-bottom: var(--space-4);
}

.card-mnemonic-label {
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--ink-500);
    text-transform: uppercase;
    letter-spacing: var(--tracking-caps);
    margin-bottom: var(--space-1);
}

.card-mnemonic {
    font-size: var(--text-base);
    color: var(--ink-600);
    line-height: var(--leading-normal);
}

/* =====================================================================
   Loading & Error States
   ===================================================================== */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-10);
}

/* Phase 2.9: Bouncing dots loader */
.loading-dots {
    display: flex;
    gap: var(--space-2);
    align-items: center;
    justify-content: center;
}

.loading-dots .dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--primary-400);
    animation: bounce-dot 1.2s ease-in-out infinite;
}

.loading-dots .dot:nth-child(2) {
    animation-delay: 0.15s;
}

.loading-dots .dot:nth-child(3) {
    animation-delay: 0.3s;
}

/* Legacy spinner fallback */
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--surface-2);
    border-top-color: var(--primary-600);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@keyframes bounce-dot {

    0%,
    80%,
    100% {
        transform: translateY(0);
    }

    40% {
        transform: translateY(-12px);
    }
}

.loading-text {
    margin-top: var(--space-4);
    color: var(--ink-500);
}

.error {
    background: var(--color-error-soft);
    border: 1px solid var(--color-error);
    border-radius: var(--radius-lg);
    padding: var(--space-7);
    text-align: center;
}

.error-title {
    color: var(--color-error);
    font-weight: 600;
}

.error-details {
    color: var(--color-error);
    font-size: var(--text-sm);
    margin-top: var(--space-2);
    opacity: 0.8;
}

/* =====================================================================
   Phase 2.4: Quiz Mode — segmented progress, state animations
   ===================================================================== */
.quiz {
    max-width: 500px;
    margin: 0 auto;
}

.quiz-card {
    background: var(--surface-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-7);
    transition: box-shadow 0.3s ease, border-color 0.3s ease;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

/* State changes */
.quiz-card.state-correct {
    border-color: var(--color-success);
    box-shadow: var(--shadow-glow-success);
    animation: correct-pulse 0.6s ease;
}

.quiz-card.state-wrong {
    border-color: var(--color-error);
    box-shadow: var(--shadow-glow-error);
    animation: quiz-shake 0.5s ease;
}

/* Segmented progress bar */
.quiz-progress-bar {
    display: flex;
    gap: 3px;
    margin-bottom: var(--space-6);
}

.quiz-progress-segment {
    flex: 1;
    height: 4px;
    border-radius: var(--radius-full);
    background: var(--surface-2);
    transition: background 0.3s ease;
}

.quiz-progress-segment.correct {
    background: var(--color-success);
}

.quiz-progress-segment.wrong {
    background: var(--color-error);
}

.quiz-progress-segment.current {
    background: var(--primary-400);
}

.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-6);
}

.quiz-title {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 700;
}

.quiz-progress {
    font-size: var(--text-sm);
    color: var(--ink-500);
}

.quiz-word {
    text-align: center;
    padding: var(--space-6) 0;
}

.quiz-word-text {
    font-family: var(--font-display);
    font-size: var(--text-3xl);
    font-weight: 700;
    color: var(--primary-700);
    margin-bottom: var(--space-2);
}

.quiz-word-hint {
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    color: var(--ink-500);
}

.quiz-input {
    width: 100%;
    padding: var(--space-4);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--text-base);
    font-family: var(--font-body);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    background: var(--surface-raised);
    color: var(--ink-800);
}

.quiz-input:focus {
    outline: none;
    border-color: var(--primary-600);
    box-shadow: var(--shadow-glow-primary);
}

.quiz-actions {
    display: flex;
    gap: var(--space-3);
    margin-top: var(--space-5);
}

.quiz-feedback {
    margin-top: var(--space-5);
    text-align: center;
    padding: var(--space-4);
    border-radius: var(--radius-md);
    animation: feedback-slide 0.3s var(--ease-out);
}

.quiz-feedback.correct {
    background: var(--color-success-soft);
    color: var(--color-success);
}

.quiz-feedback.wrong {
    background: var(--color-error-soft);
    color: var(--color-error);
}

/* =====================================================================
   Responsive
   ===================================================================== */
@media (max-width: 768px) {
    .header {
        padding: var(--space-3) var(--space-4);
    }

    .header-inner {
        gap: var(--space-2);
    }

    .nav {
        display: none;
    }

    .mobile-nav {
        display: block;
        position: fixed;
        bottom: calc(env(safe-area-inset-bottom, 16px) + 20px);
        left: 50%;
        right: auto;
        transform: translateX(-50%);
        width: auto;
        min-width: 280px;
        max-width: calc(100vw - 24px);
        background: rgba(250, 247, 242, 0.85);
        /* var(--surface-0) with opacity */
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border: 1px solid rgba(255, 255, 255, 0.2);
        border-radius: var(--radius-full);
        box-shadow: 0 10px 40px rgba(60, 50, 30, 0.15);
        z-index: 100;
        padding: var(--space-2) var(--space-5);
    }

    [data-tg-color-scheme="dark"] .mobile-nav {
        background: rgba(30, 38, 32, 0.8);
        border-color: rgba(255, 255, 255, 0.08);
        box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    }

    .mobile-nav-inner {
        display: flex;
        justify-content: space-evenly;
        align-items: center;
    }

    .mobile-nav-link {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 3px;
        padding: var(--space-2) 4px;
        background: transparent;
        border: none;
        color: var(--ink-500);
        font-family: var(--font-body);
        font-size: 10px;
        font-weight: 600;
        cursor: pointer;
        transition: all 0.2s ease;
        border-radius: var(--radius-xl);
        position: relative;
        white-space: nowrap;
    }

    .mobile-nav-icon {
        width: 20px;
        height: 20px;
        stroke-width: 2;
        transition: transform 0.3s var(--ease-spring);
    }

    .mobile-nav-link.active {
        color: var(--primary-700);
    }

    .mobile-nav-link.active::before {
        content: '';
        position: absolute;
        inset: 0;
        background: var(--primary-100);
        border-radius: var(--radius-xl);
        z-index: -1;
        opacity: 0.6;
    }

    [data-tg-color-scheme="dark"] .mobile-nav-link.active {
        color: var(--primary-400);
    }

    [data-tg-color-scheme="dark"] .mobile-nav-link.active::before {
        background: var(--surface-2);
        opacity: 0.8;
    }

    .mobile-nav-link.active .mobile-nav-icon {
        transform: translateY(-2px) scale(1.1);
        stroke-width: 2.5;
    }

    .mobile-nav::after {
        content: '';
        position: absolute;
        inset: 0;
        border-radius: inherit;
        box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.3);
        pointer-events: none;
    }

    [data-tg-color-scheme="dark"] .mobile-nav::after {
        box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
    }

    .logo-icon {
        width: 32px;
        height: 32px;
        font-size: var(--text-base);
    }

    .header-mnemo {
        width: 37px;
        height: 42px;
    }

    .logo-text {
        font-size: var(--text-lg);
    }

    .hero-title {
        font-size: var(--text-2xl);
    }

    .hero-subtitle {
        font-size: var(--text-base);
    }

    .stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .stat-card {
        padding: var(--space-4);
    }

    .stat-value {
        font-size: var(--text-xl);
    }

    .card-grid {
        grid-template-columns: 1fr;
    }

    .main {
        padding: var(--space-5) var(--space-4);
        padding-bottom: calc(var(--space-11) + env(safe-area-inset-bottom, 0px));
    }
}

/* =====================================================================
   Utilities
   ===================================================================== */
.hidden {
    display: none !important;
}

/* =====================================================================
   Phase 2.6: Dashboard — Hero card, action grid
   ===================================================================== */
.dashboard {
    margin-bottom: var(--space-7);
}

.dashboard-welcome {
    background: linear-gradient(135deg, var(--primary-50), var(--surface-1));
    border-radius: var(--radius-2xl);
    padding: var(--space-8) var(--space-7);
    margin-bottom: var(--space-7);
    text-align: center;
    position: relative;
    overflow: hidden;
}

/* Paper grain texture on hero */
.dashboard-welcome::before {
    content: '';
    position: absolute;
    inset: 0;
    opacity: 0.25;
    pointer-events: none;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
}

/* Decorative gradient circle */
.dashboard-welcome::after {
    content: '';
    position: absolute;
    top: -40%;
    right: -20%;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(106, 138, 112, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.dashboard-greeting {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--ink-900);
    margin-bottom: var(--space-2);
    position: relative;
    letter-spacing: var(--tracking-tight);
}

.dashboard-subtitle {
    color: var(--ink-600);
    font-size: var(--text-base);
    position: relative;
}

/* Streak badge */
.streak-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-1) var(--space-3);
    background: linear-gradient(135deg, var(--accent-500), var(--accent-600));
    color: white;
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: 600;
    margin-top: var(--space-3);
    position: relative;
}

.streak-badge .fire {
    animation: flicker 1.5s ease-in-out infinite alternate;
}

.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    grid-auto-rows: minmax(100px, auto);
    gap: var(--space-3);
    margin-bottom: var(--space-7);
}

@media (min-width: 768px) {
    .dashboard-stats {
        grid-template-columns: repeat(4, 1fr);
        grid-auto-rows: 120px;
    }
}

.dashboard-stat {
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: var(--radius-xl);
    padding: var(--space-5);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: space-between;
    transition: transform 0.2s var(--ease-spring), box-shadow 0.2s ease, border-color 0.2s ease;
    position: relative;
    overflow: hidden;
}

[data-tg-color-scheme="dark"] .dashboard-stat {
    background: rgba(46, 54, 48, 0.5);
    border-color: rgba(255, 255, 255, 0.05);
}

.dashboard-stat::before {
    content: '';
    position: absolute;
    top: -20px;
    right: -20px;
    width: 100px;
    height: 100px;
    background: radial-gradient(circle, var(--primary-100) 0%, transparent 60%);
    opacity: 0.5;
    border-radius: 50%;
    z-index: 0;
}

[data-tg-color-scheme="dark"] .dashboard-stat::before {
    background: radial-gradient(circle, var(--primary-900) 0%, transparent 60%);
    opacity: 0.1;
}

.dashboard-stat:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-200);
}

.dashboard-stat-value {
    font-family: var(--font-display);
    font-size: var(--text-4xl);
    font-weight: 700;
    color: var(--primary-700);
    margin-bottom: var(--space-1);
    z-index: 1;
    position: relative;
}

[data-tg-color-scheme="dark"] .dashboard-stat-value {
    color: var(--primary-400);
}

.dashboard-stat-label {
    font-size: var(--text-sm);
    color: var(--ink-600);
    font-weight: 500;
    z-index: 1;
    position: relative;
}

.dashboard-section-title {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 600;
    margin-bottom: var(--space-4);
    color: var(--ink-900);
    display: flex;
    align-items: center;
    gap: var(--space-2);
    letter-spacing: var(--tracking-tight);
}

@media (max-width: 768px) {
    .dashboard-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .dashboard-greeting {
        font-size: var(--text-xl);
    }

    .dashboard-welcome {
        padding: var(--space-6);
    }
}

/* =====================================================================
   Phase 2.5: Modals — bottom-sheet mobile, centered desktop
   ===================================================================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--surface-overlay);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    padding: var(--space-4);
    animation: overlay-fade 0.25s ease;
}

.modal-overlay[role="dialog"] {
    /* accessibility — already styled */
}

.modal {
    background: var(--surface-raised);
    border-radius: var(--radius-2xl);
    max-width: 500px;
    width: 100%;
    max-height: 85vh;
    overflow-y: auto;
    padding: var(--space-6);
    animation: modal-pop 0.35s var(--ease-spring);
    position: relative;
}

/* Drag handle for mobile bottom-sheet */
.modal::before {
    content: '';
    display: none;
    width: 36px;
    height: 4px;
    background: var(--surface-3);
    border-radius: var(--radius-full);
    margin: 0 auto var(--space-4);
}

@media (max-width: 768px) {
    .modal-overlay {
        align-items: flex-end;
        padding: 0;
    }

    .modal {
        border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
        max-height: 90vh;
        animation: modal-slide-up 0.35s var(--ease-spring);
        padding-bottom: calc(var(--space-6) + env(safe-area-inset-bottom, 0px));
    }

    .modal::before {
        display: block;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-5);
}

.modal-title {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--ink-900);
}

.modal-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--surface-1);
    border: none;
    border-radius: 50%;
    font-size: var(--text-lg);
    cursor: pointer;
    color: var(--ink-500);
    transition: background 0.2s ease, color 0.2s ease;
    flex-shrink: 0;
}

.modal-close:hover {
    background: var(--surface-2);
    color: var(--ink-800);
}

.modal-close:focus-visible {
    outline: none;
    box-shadow: var(--shadow-glow-primary);
}

/* Quiz Lesson Search */
.quiz-lesson-search-wrapper {
    padding: 0 var(--space-4) var(--space-3);
}

/* Quiz Course Accordion */
.quiz-lesson-accordion {
    padding: 0 var(--space-4) var(--space-4);
}

.quiz-course-group {
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
    margin-bottom: var(--space-2);
}

.quiz-course-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    width: 100%;
    padding: var(--space-4);
    background: var(--surface-1);
    border: none;
    cursor: pointer;
    text-align: left;
    font-family: var(--font-body);
    transition: background 0.2s ease;
    -webkit-tap-highlight-color: transparent;
}

.quiz-course-header:hover {
    background: var(--surface-2);
}

.quiz-course-name {
    flex: 1;
    min-width: 0;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: var(--text-base);
    color: var(--ink-900);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.quiz-course-meta {
    font-size: var(--text-sm);
    color: var(--ink-500);
    flex-shrink: 0;
}

.quiz-course-chevron {
    flex-shrink: 0;
    color: var(--ink-400);
    transition: transform 0.3s var(--ease-spring);
}

.quiz-course-header[aria-expanded="true"] .quiz-course-chevron {
    transform: rotate(180deg);
}

.quiz-course-body {
    overflow: hidden;
    transition: max-height 0.35s ease;
}

.quiz-lesson-option {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-3) var(--space-4);
    background: var(--surface-0);
    border-top: 1px solid var(--color-border);
    cursor: pointer;
    transition: background 0.2s ease;
}

.quiz-lesson-option:hover {
    background: var(--primary-50);
}

.quiz-lesson-name {
    font-weight: 600;
    font-size: var(--text-sm);
    color: var(--ink-800);
}

.quiz-lesson-count {
    font-size: var(--text-xs);
    color: var(--ink-500);
    flex-shrink: 0;
}

[data-tg-color-scheme="dark"] .quiz-course-group {
    border-color: var(--color-border);
}

[data-tg-color-scheme="dark"] .quiz-course-header {
    background: var(--surface-2);
}

[data-tg-color-scheme="dark"] .quiz-course-header:hover {
    background: var(--surface-3);
}

[data-tg-color-scheme="dark"] .quiz-lesson-option {
    background: var(--surface-1);
    border-top-color: var(--color-border);
}

[data-tg-color-scheme="dark"] .quiz-lesson-option:hover {
    background: var(--primary-100);
}

/* =====================================================================
   Lesson Selector
   ===================================================================== */
.lesson-selector {
    margin-bottom: var(--space-7);
}

.lesson-selector-title {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 600;
    margin-bottom: var(--space-4);
    color: var(--ink-800);
}

/* Phase 2.7: Library — accent bars, frosted locks */
.courses-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.course-block {
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    position: relative;
    overflow: hidden;
    animation: view-enter 0.35s var(--ease-out) both;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-tg-color-scheme="dark"] .course-block {
    background: rgba(46, 54, 48, 0.5);
    border-color: rgba(255, 255, 255, 0.05);
}

/* Colored left-edge accent bar */
.course-block::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--primary-600);
    border-radius: var(--radius-xl) 0 0 var(--radius-xl);
}

.course-block:nth-child(2)::before {
    background: var(--accent-500);
}

.course-block:nth-child(3)::before {
    background: var(--gold-500);
}

.course-block:nth-child(4)::before {
    background: var(--color-info);
}

.course-block:nth-child(5)::before {
    background: var(--color-success);
}

.course-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.course-icon {
    font-size: var(--text-xl);
}

.course-name {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--ink-900);
}

.course-description {
    font-size: var(--text-sm);
    color: var(--ink-600);
    margin-bottom: var(--space-4);
}

.lessons-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--space-3);
}

.lesson-btn {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-4);
    background: rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
    font-family: var(--font-body);
}

[data-tg-color-scheme="dark"] .lesson-btn {
    background: rgba(46, 54, 48, 0.3);
    border-color: rgba(255, 255, 255, 0.05);
}

.lesson-btn:hover {
    background: rgba(255, 255, 255, 0.7);
    border-color: var(--primary-300);
    transform: translateY(-2px) scale(1.01);
}

[data-tg-color-scheme="dark"] .lesson-btn:hover {
    background: rgba(46, 54, 48, 0.6);
    border-color: var(--primary-600);
}

.lesson-btn.active {
    background: var(--primary-50);
    border-color: var(--primary-600);
}

.lesson-btn-name {
    font-weight: 600;
    font-size: var(--text-base);
    color: var(--ink-800);
    margin-bottom: var(--space-1);
}

.lesson-btn-count {
    font-size: var(--text-sm);
    color: var(--ink-500);
}

/* Locked lesson — frosted glass overlay instead of opacity */
.lesson-btn.locked-lesson {
    position: relative;
    cursor: not-allowed;
    background: var(--surface-1);
    border-color: var(--color-border);
}

.lesson-btn.locked-lesson::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    border-radius: inherit;
    pointer-events: none;
}

.lesson-btn.locked-lesson:hover {
    background: var(--surface-1);
    border-color: var(--color-border);
    transform: none;
    box-shadow: none;
}

.lesson-btn.locked-lesson .lesson-btn-name {
    color: var(--ink-500);
}

.lesson-btn.locked-lesson .lesson-btn-count {
    color: var(--accent-600);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.lesson-btn-count--locked {
    color: var(--accent-600);
}

.current-lesson-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    background: var(--primary-50);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-4);
    font-size: var(--text-sm);
    color: var(--primary-700);
    font-weight: 500;
}

.current-lesson-badge button {
    background: none;
    border: none;
    color: var(--primary-400);
    cursor: pointer;
    font-size: var(--text-base);
    padding: 0;
    margin-left: var(--space-1);
    transition: color 0.2s ease;
}

.current-lesson-badge button:hover {
    color: var(--primary-700);
}

/* =====================================================================
   Admin Panel
   ===================================================================== */
#view-admin {
    padding: var(--space-4) 0;
}

#view-admin .dashboard-section-title {
    margin-bottom: var(--space-4);
}

/* Subscription Badge */
.subscription-badge {
    margin: var(--space-4) auto;
    max-width: 350px;
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-lg);
    text-align: center;
    font-size: var(--text-sm);
    font-weight: 500;
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.06);
}

.subscription-badge.sub-active {
    background: var(--color-success-soft);
    color: var(--color-success);
    border-color: var(--color-success);
}

.subscription-badge.sub-inactive {
    background: var(--accent-100);
    color: var(--accent-600);
    border-color: var(--accent-500);
}

.subscription-badge .sub-days {
    display: block;
    font-size: var(--text-xs);
    color: var(--ink-500);
    margin-top: var(--space-1);
}

/* =====================================================================
   PROFILE VIEW
   ===================================================================== */

.profile-card {
    background: var(--surface-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    margin-bottom: var(--space-4);
}

[data-tg-color-scheme="dark"] .profile-card,
.dark .profile-card {
    background: var(--dark-surface-raised, rgba(26, 31, 27, 0.6));
    border-color: rgba(255, 255, 255, 0.08);
}

.profile-card-title {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--ink-900);
    margin-bottom: var(--space-4);
}

.profile-action-btn {
    width: 100%;
    margin-top: var(--space-3);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
}

/* Credits display */
.profile-credits-display {
    display: flex;
    align-items: baseline;
    gap: var(--space-2);
    margin-bottom: var(--space-2);
}

.profile-credits-value {
    font-family: var(--font-display);
    font-size: var(--text-3xl);
    font-weight: 700;
    color: var(--primary-700);
}

.profile-credits-label {
    font-size: var(--text-base);
    color: var(--ink-500);
}

/* Settings */
.profile-setting {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--color-border);
}

.profile-setting:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.profile-setting-label {
    font-size: var(--text-base);
    font-weight: 500;
    color: var(--ink-800);
}

/* Option buttons group (theme, language) */
.profile-setting-options {
    display: flex;
    gap: var(--space-1);
    background: var(--surface-sunken, rgba(0,0,0,0.04));
    border-radius: var(--radius-md);
    padding: var(--space-1);
}

[data-tg-color-scheme="dark"] .profile-setting-options,
.dark .profile-setting-options {
    background: rgba(255, 255, 255, 0.06);
}

.profile-option-btn {
    padding: var(--space-2) var(--space-3);
    border: none;
    background: none;
    border-radius: var(--radius-sm);
    font-size: var(--text-sm);
    font-weight: 500;
    font-family: var(--font-body);
    color: var(--ink-500);
    cursor: pointer;
    transition: all 0.2s var(--ease-spring);
}

.profile-option-btn.active {
    background: var(--primary-700);
    color: white;
    box-shadow: var(--shadow-sm);
}

.profile-option-btn:hover:not(.active) {
    color: var(--ink-800);
    background: rgba(0,0,0,0.04);
}

[data-tg-color-scheme="dark"] .profile-option-btn:hover:not(.active),
.dark .profile-option-btn:hover:not(.active) {
    background: rgba(255,255,255,0.06);
}

/* Toggle switch */
.profile-toggle {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 26px;
}

.profile-toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.profile-toggle-slider {
    position: absolute;
    cursor: pointer;
    inset: 0;
    background: var(--ink-300);
    border-radius: var(--radius-full);
    transition: background 0.2s ease;
}

.profile-toggle-slider::before {
    content: '';
    position: absolute;
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background: white;
    border-radius: 50%;
    transition: transform 0.2s var(--ease-spring);
}

.profile-toggle input:checked + .profile-toggle-slider {
    background: var(--primary-600);
}

.profile-toggle input:checked + .profile-toggle-slider::before {
    transform: translateX(22px);
}

/* =====================================================================
   Referral Card
   ===================================================================== */

.referral-card {
    border-color: var(--accent-300);
    position: relative;
    overflow: hidden;
}

.referral-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-500), var(--accent-300));
}

[data-tg-color-scheme="dark"] .referral-card,
.dark .referral-card {
    border-color: var(--accent-400);
}

[data-tg-color-scheme="dark"] .referral-card::before,
.dark .referral-card::before {
    background: linear-gradient(90deg, var(--accent-400), var(--accent-600));
}

.profile-card__header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-2);
}

.profile-card__icon {
    font-size: var(--text-2xl);
    line-height: 1;
}

.profile-card__header h3 {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--ink-900);
    margin: 0;
}

.referral-card__subtitle {
    font-size: var(--text-sm);
    color: var(--ink-500);
    margin: 0 0 var(--space-4);
    line-height: 1.5;
}

.referral-card__code-label {
    display: block;
    font-size: var(--text-xs);
    color: var(--ink-500);
    margin-bottom: var(--space-1);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.referral-card__code-row {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.referral-card__code {
    flex: 1;
    font-family: var(--font-mono);
    font-size: var(--text-base);
    font-weight: 500;
    color: var(--ink-800);
    background: var(--surface-2);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    letter-spacing: 0.05em;
    text-align: center;
    user-select: all;
}

[data-tg-color-scheme="dark"] .referral-card__code,
.dark .referral-card__code {
    background: rgba(255, 255, 255, 0.06);
    color: var(--ink-300);
}

.referral-card__copy-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--color-border);
    background: var(--surface-1);
    border-radius: var(--radius-md);
    color: var(--ink-500);
    cursor: pointer;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.referral-card__copy-btn:hover {
    background: var(--surface-2);
    color: var(--primary-700);
    border-color: var(--primary-700);
}

.referral-card__copy-btn:active {
    transform: scale(0.92);
}

[data-tg-color-scheme="dark"] .referral-card__copy-btn,
.dark .referral-card__copy-btn {
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(255, 255, 255, 0.1);
}

[data-tg-color-scheme="dark"] .referral-card__copy-btn:hover,
.dark .referral-card__copy-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--primary-500);
    border-color: var(--primary-500);
}

.referral-card__stats {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-4);
}

.referral-card__stat {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-3);
    background: var(--surface-1);
    border-radius: var(--radius-md);
}

[data-tg-color-scheme="dark"] .referral-card__stat,
.dark .referral-card__stat {
    background: rgba(255, 255, 255, 0.04);
}

.referral-card__stat-value {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--accent-500);
}

.referral-card__stat-label {
    font-size: var(--text-xs);
    font-weight: 500;
    color: var(--ink-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.referral-card__share-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
}

/* Modal forms */
#card-edit-modal input,
#card-edit-modal textarea,
#import-modal input,
#import-modal select {
    font-size: var(--text-sm);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

#card-edit-modal input:focus,
#card-edit-modal textarea:focus,
#import-modal input:focus,
#import-modal select:focus {
    border-color: var(--primary-600);
    outline: none;
    box-shadow: var(--shadow-glow-primary);
}

/* =====================================================================
   Form Components
   ===================================================================== */
.form-group {
    margin-bottom: var(--space-6);
}

.form-label {
    display: block;
    margin-bottom: var(--space-2);
    font-weight: 500;
    font-size: var(--text-sm);
    color: var(--ink-700);
}

.form-input {
    width: 100%;
    padding: var(--space-3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: var(--text-sm);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    background: var(--surface-raised);
    color: var(--ink-800);
}

.form-input:focus {
    border-color: var(--primary-600);
    outline: none;
    box-shadow: var(--shadow-glow-primary);
}

.form-select {
    width: 100%;
    padding: var(--space-3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: var(--text-sm);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    background: var(--surface-raised);
    color: var(--ink-800);
}

.form-select:focus {
    border-color: var(--primary-600);
    outline: none;
    box-shadow: var(--shadow-glow-primary);
}

.form-textarea {
    width: 100%;
    padding: var(--space-3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: var(--text-sm);
    resize: vertical;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    background: var(--surface-raised);
    color: var(--ink-800);
}

.form-textarea:focus {
    border-color: var(--primary-600);
    outline: none;
    box-shadow: var(--shadow-glow-primary);
}

.form-hint {
    font-size: var(--text-sm);
    color: var(--ink-500);
    margin-top: var(--space-2);
}

/* =====================================================================
   Dashboard Home Actions — 2-column action cards grid
   ===================================================================== */
.home-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
    margin-top: var(--space-7);
}

.home-action-btn {
    padding: var(--space-5) var(--space-6);
    font-size: var(--text-base);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    border-radius: var(--radius-lg);
    transition: all 0.2s var(--ease-spring);
}

/* Primary action spans full width */
.home-action-btn:first-child {
    grid-column: 1 / -1;
}

.home-action-hint {
    color: var(--ink-500);
    font-size: var(--text-sm);
    grid-column: 1 / -1;
    text-align: center;
}

@media (max-width: 480px) {
    .home-actions {
        grid-template-columns: 1fr;
    }
}

/* Display tracking */
.dashboard-greeting,
.dashboard-section-title,
.card-word,
.modal-title,
.course-name {
    letter-spacing: var(--tracking-display);
}

/* Dashboard Bento Grid */
.dashboard-bento {
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-2xl);
    padding: var(--space-6);
    margin-top: var(--space-7);
    box-shadow: var(--shadow-glass);
}

[data-tg-color-scheme="dark"] .dashboard-bento {
    background: rgba(46, 54, 48, 0.5);
    border-color: rgba(255, 255, 255, 0.05);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-tg-color-scheme]) .dashboard-bento {
        background: rgba(46, 54, 48, 0.5);
        border-color: rgba(255, 255, 255, 0.05);
    }
}

/* =====================================================================
   Admin Tabs
   ===================================================================== */
.admin-tabs {
    display: flex;
    gap: var(--space-2);
    margin-bottom: var(--space-5);
}

.admin-tab {
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    background: var(--surface-raised);
    cursor: pointer;
    font-family: var(--font-body);
    font-weight: 500;
    transition: all 0.2s ease;
    color: var(--ink-600);
}

.admin-tab.active {
    background: var(--primary-700);
    color: white;
    border-color: var(--primary-700);
}

.admin-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
}

/* =====================================================================
   Admin Stats Grid
   ===================================================================== */
.admin-stats-grid {
    display: grid;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.admin-stats-grid--3 {
    grid-template-columns: repeat(3, 1fr);
}

.admin-stats-grid--4 {
    grid-template-columns: repeat(4, 1fr);
}

.admin-stat-card {
    text-align: center;
    padding: var(--space-3);
    border-radius: var(--radius-md);
}

.admin-stat-card--blue {
    background: var(--color-stat-blue);
}

.admin-stat-card--green {
    background: var(--color-stat-green);
}

.admin-stat-card--orange {
    background: var(--color-stat-orange);
}

.admin-stat-card--red {
    background: var(--color-stat-red);
}

.admin-stat-card--yellow {
    background: var(--color-stat-yellow);
}

/* =====================================================================
   Panel Card
   ===================================================================== */
.panel-card {
    background: var(--surface-raised);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    box-shadow: var(--shadow-sm);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-4);
}

.panel-title {
    font-size: var(--text-base);
    font-weight: 600;
    margin: 0;
}

/* =====================================================================
   Credits Pack Cards
   ===================================================================== */
.credits-pack {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    background: var(--surface-raised);
    transition: all 0.2s ease;
    position: relative;
}

.credits-pack.selected {
    border-color: var(--primary-600);
    background: var(--primary-50);
}

.credits-pack-badge {
    position: absolute;
    top: -8px;
    right: 12px;
    font-size: var(--text-xs);
    font-weight: 700;
    padding: 2px 8px;
    border-radius: var(--radius-md);
    color: white;
}

.credits-pack-badge--hot {
    background: linear-gradient(135deg, var(--accent-600), var(--accent-500));
}

.credits-pack-badge--pro {
    background: linear-gradient(135deg, #6c5ce7, #a55eea);
}

/* =====================================================================
   Payment Tabs
   ===================================================================== */
.payment-tabs {
    display: flex;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.payment-tab {
    flex: 1;
    padding: var(--space-2);
    border-radius: var(--radius-md);
    border: 2px solid var(--color-border);
    background: var(--surface-raised);
    cursor: pointer;
    font-family: var(--font-body);
    font-weight: 600;
    font-size: var(--text-sm);
    color: var(--ink-500);
    transition: all 0.2s ease;
}

.payment-tab.active {
    border-color: var(--primary-600);
    background: var(--primary-50);
    color: var(--primary-700);
}

/* =====================================================================
   Empty State
   ===================================================================== */
.empty-state {
    text-align: center;
    padding: var(--space-9) var(--space-6);
    color: var(--ink-500);
}

.empty-state-icon {
    font-size: var(--text-5xl);
    margin-bottom: var(--space-4);
    animation: float 3s ease-in-out infinite;
}

.empty-state-title {
    color: var(--ink-800);
    margin-bottom: var(--space-2);
    font-size: var(--text-lg);
    font-family: var(--font-display);
}

.empty-state-text {
    font-size: var(--text-sm);
    line-height: var(--leading-normal);
    margin-bottom: var(--space-4);
}

/* =====================================================================
   Phase 2.10: Toast Notification — enhanced slide-up
   ===================================================================== */
.toast {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    font-weight: 500;
    z-index: 300;
    opacity: 0;
    transition: opacity 0.3s ease, transform 0.3s var(--ease-spring);
    pointer-events: none;
    max-width: 90%;
    box-shadow: var(--shadow-lg);
}

.toast[aria-live] {
    /* accessibility marker */
}

.toast.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.toast.success {
    background: var(--color-success);
    color: white;
}

.toast.error {
    background: var(--color-error);
    color: white;
}

/* =====================================================================
   Confirm Modal
   ===================================================================== */
.confirm-body {
    padding: var(--space-5);
}

.confirm-text {
    margin-bottom: var(--space-5);
    line-height: var(--leading-normal);
}

.confirm-actions {
    display: flex;
    gap: var(--space-3);
    justify-content: flex-end;
}

/* =====================================================================
   Create Status
   ===================================================================== */
.create-status {
    margin-bottom: var(--space-4);
    padding: var(--space-4);
    background: var(--color-info-soft);
    border-radius: var(--radius-md);
    color: var(--color-info);
}

/* =====================================================================
   Skeleton Loading — improved shimmer
   ===================================================================== */
.card-skeleton {
    background: linear-gradient(90deg, var(--surface-1) 25%, var(--surface-0) 50%, var(--surface-1) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-xl);
    height: 300px;
}

@keyframes shimmer {
    0% {
        background-position: 200% 0;
    }

    100% {
        background-position: -200% 0;
    }
}

/* =====================================================================
   Phase 3: Animations & Motion System
   ===================================================================== */

/* View enter transition */
@keyframes view-enter {
    from {
        opacity: 0;
        transform: translateY(12px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

main>section:not(.hidden) {
    animation: view-enter 0.35s var(--ease-out);
}

/* Card grid entrance */
@keyframes card-enter {
    from {
        opacity: 0;
        transform: scale(0.97) translateY(20px);
    }

    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

/* Stagger children utility */
.stagger-children>*:nth-child(1) {
    animation-delay: 0ms;
}

.stagger-children>*:nth-child(2) {
    animation-delay: 50ms;
}

.stagger-children>*:nth-child(3) {
    animation-delay: 100ms;
}

.stagger-children>*:nth-child(4) {
    animation-delay: 150ms;
}

.stagger-children>*:nth-child(5) {
    animation-delay: 200ms;
}

.stagger-children>*:nth-child(6) {
    animation-delay: 250ms;
}

.stagger-children>*:nth-child(7) {
    animation-delay: 300ms;
}

.stagger-children>*:nth-child(8) {
    animation-delay: 350ms;
}

.stagger-children>*:nth-child(9) {
    animation-delay: 400ms;
}

.stagger-children>*:nth-child(10) {
    animation-delay: 450ms;
}

.stagger-children>*:nth-child(11) {
    animation-delay: 500ms;
}

.stagger-children>*:nth-child(12) {
    animation-delay: 550ms;
}

/* Course block stagger */
.course-block:nth-child(1) {
    animation-delay: 0ms;
}

.course-block:nth-child(2) {
    animation-delay: 80ms;
}

.course-block:nth-child(3) {
    animation-delay: 160ms;
}

.course-block:nth-child(4) {
    animation-delay: 240ms;
}

.course-block:nth-child(5) {
    animation-delay: 320ms;
}

/* Quiz shake */
@keyframes quiz-shake {
    0% {
        transform: translateX(0) rotate(0);
    }

    15% {
        transform: translateX(-6px) rotate(-1deg);
    }

    30% {
        transform: translateX(5px) rotate(0.5deg);
    }

    45% {
        transform: translateX(-4px) rotate(-0.5deg);
    }

    60% {
        transform: translateX(3px) rotate(0.25deg);
    }

    75% {
        transform: translateX(-2px) rotate(0);
    }

    100% {
        transform: translateX(0) rotate(0);
    }
}

/* Correct pulse glow */
@keyframes correct-pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.3);
    }

    50% {
        box-shadow: 0 0 0 12px rgba(34, 197, 94, 0);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(34, 197, 94, 0);
    }
}

/* Feedback slide in */
@keyframes feedback-slide {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Streak fire flicker */
@keyframes flicker {
    0% {
        transform: scale(1) rotate(0deg);
    }

    50% {
        transform: scale(1.1) rotate(3deg);
    }

    100% {
        transform: scale(1) rotate(-2deg);
    }
}

/* Empty state float */
@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-8px);
    }
}

/* Nav icon bounce */
@keyframes nav-bounce {
    0% {
        transform: scale(0.8);
    }

    50% {
        transform: scale(1.05);
    }

    100% {
        transform: scale(1);
    }
}

/* Modal animations */
@keyframes overlay-fade {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes modal-pop {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes modal-slide-up {
    from {
        opacity: 0;
        transform: translateY(100%);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Modal leaving states (applied by JS) */
.modal-overlay.modal-leaving {
    animation: overlay-fade 0.2s ease reverse forwards;
}

.modal-overlay.modal-leaving .modal {
    animation: modal-pop 0.2s ease reverse forwards;
}

@media (max-width: 768px) {
    .modal-overlay.modal-leaving .modal {
        animation: modal-slide-up 0.2s ease reverse forwards;
    }
}

/* Ripple effect */
.ripple {
    position: relative;
    overflow: hidden;
}

.ripple::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    background-image: radial-gradient(circle, rgba(255, 255, 255, 0.3) 10%, transparent 10%);
    background-repeat: no-repeat;
    background-position: 50%;
    transform: scale(10);
    opacity: 0;
    transition: transform 0.4s, opacity 0.8s;
}

.ripple:active::after {
    transform: scale(0);
    opacity: 1;
    transition: 0s;
}

/* =====================================================================
   Modal Body
   ===================================================================== */
.modal-body {
    padding: var(--space-5);
}

/* =====================================================================
   Validating Screen
   ===================================================================== */
.validating {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--surface-0);
}

.validating-text {
    font-family: var(--font-display);
    color: var(--ink-500);
    margin-top: var(--space-4);
}

/* =====================================================================
   Home Action Buttons
   ===================================================================== */
.home-action-hint {
    color: var(--ink-500);
    font-size: var(--text-sm);
}

/* =====================================================================
   Create Card Container
   ===================================================================== */
.create-card-container {
    background: var(--surface-raised);
    padding: var(--space-6);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
}

/* =====================================================================
   Admin Panel Components (CSS classes replacing inline styles)
   ===================================================================== */
.admin-course-card {
    background: var(--surface-raised);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    box-shadow: var(--shadow-sm);
}

.admin-course-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-3);
}

.admin-course-name {
    font-size: var(--text-lg);
    font-weight: 600;
}

.admin-course-actions {
    display: flex;
    gap: var(--space-2);
}

.admin-course-desc {
    color: var(--ink-500);
    font-size: var(--text-sm);
    margin-bottom: var(--space-2);
}

.admin-lessons-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.admin-lesson-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-2) var(--space-3);
    background: var(--surface-0);
    border-radius: var(--radius-md);
}

.admin-lesson-name {
    font-size: var(--text-sm);
}

.admin-lesson-count {
    color: var(--ink-500);
}

.admin-btn-sm {
    font-size: var(--text-xs);
    padding: var(--space-1) var(--space-3);
}

.admin-btn-danger {
    font-size: var(--text-xs);
    padding: var(--space-1) var(--space-3);
    background: var(--color-error-soft);
    border: 1px solid var(--color-error);
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--color-error);
    font-family: var(--font-body);
}

.admin-btn-danger-sm {
    font-size: var(--text-xs);
    padding: 2px var(--space-2);
    background: var(--color-error-soft);
    border: 1px solid var(--color-error);
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--color-error);
    font-family: var(--font-body);
}

.admin-stat-value {
    font-size: var(--text-xl);
    font-weight: 700;
}

.admin-stat-value--primary {
    color: var(--primary-700);
}

.admin-stat-value--success {
    color: var(--color-success);
}

.admin-stat-value--warning {
    color: var(--color-warning);
}

.admin-stat-value--error {
    color: var(--color-error);
}

.admin-stat-value--sm {
    font-size: var(--text-lg);
}

.admin-stat-label {
    font-size: var(--text-xs);
    color: var(--ink-500);
}

.admin-stat-label--sm {
    font-size: var(--text-xs);
}

.admin-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.admin-empty {
    text-align: center;
    color: var(--ink-500);
    padding: var(--space-7);
}

/* Admin subscriber row (replacing inline styles from admin.js) */
.admin-subscriber-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--color-border);
}

.admin-subscriber-row--active {
    background: var(--color-success-soft);
    border-left-color: var(--color-success);
}

.admin-subscriber-row--expiring {
    background: var(--color-warning-soft);
    border-left-color: var(--color-warning);
}

.admin-subscriber-row--expired {
    background: var(--color-error-soft);
    border-left-color: var(--color-error);
}

.admin-subscriber-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.admin-subscriber-name {
    font-weight: 600;
    font-size: var(--text-sm);
}

.admin-subscriber-detail {
    font-size: var(--text-xs);
    color: var(--ink-500);
}

.admin-subscriber-status {
    text-align: right;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.admin-subscriber-badge {
    font-size: var(--text-sm);
    font-weight: 500;
}

.admin-subscriber-badge--active {
    color: var(--color-success);
}

.admin-subscriber-badge--expiring {
    color: var(--color-warning);
}

.admin-subscriber-badge--expired {
    color: var(--color-error);
}

.admin-subscriber-date {
    font-size: var(--text-xs);
    color: var(--ink-500);
}

/* Admin transaction row (replacing inline styles from admin.js) */
.admin-transaction-row {
    padding: var(--space-3);
    border-radius: var(--radius-md);
    border: 1px solid transparent;
}

.admin-transaction-row--paid {
    background: var(--color-success-soft);
    border-color: rgba(34, 197, 94, 0.15);
}

.admin-transaction-row--refunded {
    background: var(--color-error-soft);
    border-color: rgba(239, 68, 68, 0.15);
}

.admin-tx-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.admin-tx-name {
    font-weight: 600;
    font-size: var(--text-sm);
    color: var(--ink-800);
}

.admin-tx-detail {
    font-size: var(--text-xs);
    color: var(--ink-600);
    margin-top: 2px;
}

.admin-tx-meta {
    font-size: var(--text-xs);
    color: var(--ink-500);
    margin-top: 2px;
}

.admin-tx-status {
    text-align: right;
}

.admin-tx-badge {
    font-size: var(--text-xs);
    padding: 2px var(--space-2);
    border-radius: var(--radius-full);
    font-weight: 500;
}

.admin-tx-badge--paid {
    background: rgba(34, 197, 94, 0.1);
    color: var(--color-success);
}

.admin-tx-badge--refunded {
    background: rgba(239, 68, 68, 0.1);
    color: var(--color-error);
}

.admin-refund-btn {
    margin-top: var(--space-2);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-error);
    background: var(--surface-raised);
    color: var(--color-error);
    font-size: var(--text-xs);
    cursor: pointer;
    font-family: var(--font-body);
    transition: all 0.2s ease;
}

.admin-refund-btn:hover {
    background: var(--color-error);
    color: white;
}

/* Admin loading state */
.admin-loading {
    text-align: center;
    padding: var(--space-7);
}

.admin-loading-text {
    color: var(--ink-500);
    margin-top: var(--space-2);
}

/* Admin error state */
.admin-error {
    text-align: center;
    color: var(--color-error);
    padding: var(--space-7);
}

/* Admin form field (replacing inline styles from openAdminModal) */
.admin-form-field {
    margin-bottom: var(--space-3);
}

.admin-form-label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--space-1);
    font-size: var(--text-sm);
    color: var(--ink-700);
}

.admin-form-input {
    width: 100%;
    padding: var(--space-3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: var(--text-sm);
    background: var(--surface-raised);
    color: var(--ink-800);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.admin-form-input:focus {
    border-color: var(--primary-600);
    outline: none;
    box-shadow: var(--shadow-glow-primary);
}

/* =====================================================================
   Credits / Subscription Modal Components
   ===================================================================== */
.modal-desc {
    color: var(--ink-500);
    margin-bottom: var(--space-3);
    font-size: var(--text-sm);
    text-align: center;
}

.modal-desc--sub {
    color: var(--ink-600);
    margin-bottom: var(--space-4);
    line-height: var(--leading-normal);
    font-size: var(--text-sm);
    text-align: center;
}

.credits-balance-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
    padding: var(--space-3);
    background: var(--gold-100);
    border-radius: var(--radius-md);
}

.credits-balance-bar span:first-child {
    font-size: var(--text-xl);
}

.credits-balance-bar span:last-child {
    font-weight: 600;
}

.credits-packs-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    margin-bottom: var(--space-5);
}

.pack-radio {
    accent-color: var(--primary-700);
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.pack-info {
    flex: 1;
}

.pack-name {
    font-weight: 600;
    font-size: var(--text-base);
    color: var(--ink-800);
}

.pack-detail {
    font-size: var(--text-xs);
    color: var(--ink-500);
}

.pack-price {
    text-align: right;
}

.pack-price-value {
    font-weight: 700;
    font-size: var(--text-lg);
    color: var(--primary-700);
}

.pack-price-value--stars {
    color: var(--accent-500);
}

.pack-price-sub {
    font-size: var(--text-xs);
    color: var(--ink-500);
}

.modal-pay-btn {
    width: 100%;
    justify-content: center;
    padding: var(--space-4) var(--space-6);
    font-size: var(--text-base);
}

.modal-pay-hint {
    color: var(--ink-500);
    font-size: var(--text-xs);
    margin-top: var(--space-3);
    text-align: center;
}

.modal-oferta-hint {
    color: var(--ink-400);
    font-size: 11px;
    margin-top: var(--space-2);
    text-align: center;
    line-height: 1.4;
}

.modal-oferta-hint a {
    color: var(--primary-600);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.sub-features {
    text-align: left;
    list-style: none;
    padding: 0;
    margin-bottom: var(--space-5);
    font-size: var(--text-sm);
}

.sub-features li {
    padding: var(--space-1) 0;
}

.sub-plans-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    margin-bottom: var(--space-5);
}

/* =====================================================================
   Payment Result Modal
   ===================================================================== */
.payment-result-body {
    padding: var(--space-6);
    text-align: center;
}

.payment-result-icon {
    font-size: var(--text-5xl);
    margin-bottom: var(--space-4);
}

.payment-result-text {
    font-size: var(--text-lg);
    margin-bottom: var(--space-6);
    color: var(--ink-800);
}

/* ---- Payment Mnemo Loading ---- */
.payment-mnemo-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 16px 0;
}

.payment-mnemo-loading.hidden {
    display: none;
}

.payment-mnemo-svg {
    width: 80px;
    height: 93px;
    animation: payment-mnemo-bob 2s ease-in-out infinite;
}

.payment-mnemo-bubble {
    background: var(--surface-1);
    color: var(--ink-700);
    font-family: var(--font-body);
    font-size: var(--text-sm);
    padding: 8px 16px;
    border-radius: var(--radius-md);
    box-shadow: 0 4px 12px rgba(60, 50, 30, 0.1);
    text-align: center;
    animation: payment-bubble-in 0.35s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

[data-tg-color-scheme="dark"] .payment-mnemo-bubble {
    background: var(--surface-2);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

@keyframes payment-mnemo-bob {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
}

@keyframes payment-bubble-in {
    0% { opacity: 0; transform: scale(0.8); }
    100% { opacity: 1; transform: scale(1); }
}

/* =====================================================================
   Import Preview
   ===================================================================== */
.import-preview {
    background: var(--surface-0);
    padding: var(--space-3);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    max-height: 200px;
    overflow: auto;
}

.import-preview pre {
    white-space: pre-wrap;
    font-family: var(--font-mono);
}

/* =====================================================================
   Lesson Button Layout
   ===================================================================== */
.lesson-row {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* =====================================================================
   Card Action Buttons
   ===================================================================== */
.card-action-btn {
    position: absolute;
    top: 10px;
    z-index: 100;
    background: rgba(255, 255, 255, 0.85);
    border: none;
    border-radius: 50%;
    width: 28px;
    height: 28px;
    cursor: pointer;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s ease, transform 0.15s var(--ease-spring);
}

.card-action-btn:hover {
    background: rgba(255, 255, 255, 1);
    transform: scale(1.1);
}

[data-tg-color-scheme="dark"] .card-action-btn {
    background: rgba(0, 0, 0, 0.6);
    color: var(--ink-400);
}
[data-tg-color-scheme="dark"] .card-action-btn:hover {
    background: rgba(0, 0, 0, 0.85);
}

.card-action-btn--delete {
    right: 10px;
    color: var(--color-error);
    font-weight: bold;
}

.card-action-btn--edit {
    color: var(--color-info);
    font-weight: bold;
    font-size: var(--text-xs);
}

/* ── Card Override Editing ── */
.card-edit-btn {
    position: absolute;
    bottom: 8px;
    right: 8px;
    font-size: 0.7rem;
    color: var(--ink-500);
    background: var(--surface-1);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 4px 8px;
    cursor: pointer;
    transition: color 0.2s, border-color 0.2s;
    z-index: 2;
}
.card-edit-btn:hover {
    color: var(--primary-700);
    border-color: var(--primary-700);
}

/* Editable field highlight */
.card-field-editable {
    border: 1px dashed var(--accent-500);
    border-radius: 6px;
    padding: 6px 8px;
    cursor: pointer;
    transition: background 0.2s;
}
.card-field-editable:hover {
    background: var(--surface-1);
}

/* Inline textarea */
.card-field-textarea {
    width: 100%;
    min-height: 48px;
    padding: 8px;
    font-family: 'Inter', sans-serif;
    font-size: 0.875rem;
    color: var(--ink-900);
    background: var(--surface-0);
    border: 1px solid var(--primary-700);
    border-radius: 6px;
    resize: vertical;
    outline: none;
    box-sizing: border-box;
}
.card-field-textarea:focus {
    border-color: var(--accent-500);
    box-shadow: 0 0 0 2px rgba(234, 124, 60, 0.15);
}

/* Character counter */
.card-field-counter {
    font-size: 0.7rem;
    color: var(--ink-400);
    text-align: right;
    margin-top: 2px;
}

/* Edit actions */
.card-field-actions {
    display: flex;
    gap: 8px;
    margin-top: 6px;
}
.card-field-actions button {
    flex: 1;
    padding: 6px 0;
    font-size: 0.8rem;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
}
.card-field-save {
    background: var(--primary-700);
    color: #fff;
}
.card-field-cancel {
    background: var(--surface-2);
    color: var(--ink-700);
}

/* Custom field indicator dot */
.card-field-custom::after {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    background: var(--accent-500);
    border-radius: 50%;
    margin-left: 6px;
    vertical-align: middle;
}

/* Reset button */
.card-field-reset {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    font-size: 0.75rem;
    color: var(--ink-500);
    background: none;
    border: 1px solid var(--color-border);
    border-radius: 50%;
    cursor: pointer;
    margin-left: 4px;
    padding: 0;
    vertical-align: middle;
    transition: color 0.2s, border-color 0.2s;
}
.card-field-reset:hover {
    color: var(--accent-500);
    border-color: var(--accent-500);
}

/* Dark mode adjustments */
[data-tg-color-scheme="dark"] .card-field-textarea {
    background: var(--surface-1);
    color: var(--ink-900);
}
[data-tg-color-scheme="dark"] .card-edit-btn {
    background: var(--surface-2);
}

/* Card Audio Button */
.card-audio-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    padding: 0;
    margin-top: 4px;
    border: none;
    border-radius: 50%;
    background: transparent;
    color: var(--ink-500);
    cursor: pointer;
    transition: color 0.2s ease, transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
    -webkit-tap-highlight-color: transparent;
}

.card-audio-btn i,
.card-audio-btn svg {
    width: 20px;
    height: 20px;
}

.card-audio-btn:hover {
    color: var(--primary-700);
    transform: scale(1.15);
}

.card-audio-btn:active {
    transform: scale(0.95);
}

.card-audio-btn.playing {
    color: var(--primary-700);
    animation: audio-pulse 1s ease-in-out infinite;
}

@keyframes audio-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@media (prefers-reduced-motion: reduce) {
    .card-audio-btn.playing {
        animation: none;
        opacity: 0.7;
    }
}

[data-tg-color-scheme="dark"] .card-audio-btn {
    color: var(--ink-400);
}

[data-tg-color-scheme="dark"] .card-audio-btn:hover,
[data-tg-color-scheme="dark"] .card-audio-btn.playing {
    color: var(--primary-500);
}

/* =====================================================================
   Dashboard Stats
   ===================================================================== */
.dashboard-stat-value--primary {
    color: var(--primary-700);
}

/* =====================================================================
   SVG Progress Ring (Phase 2.8)
   ===================================================================== */
.progress-ring-container {
    display: flex;
    justify-content: center;
    margin-bottom: 0;
}

.progress-ring {
    width: 140px;
    height: 140px;
}

.progress-ring__circle-bg {
    fill: none;
    stroke: var(--surface-2);
    stroke-width: 8;
}

.progress-ring__circle-fill {
    fill: none;
    stroke: var(--primary-600);
    stroke-width: 8;
    stroke-linecap: round;
    transform: rotate(-90deg);
    transform-origin: center;
    transition: stroke-dashoffset 0.6s var(--ease-spring);
}

.progress-ring__text {
    fill: var(--ink-900);
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 700;
    text-anchor: middle;
    dominant-baseline: central;
}

.progress-ring__label {
    fill: var(--ink-500);
    font-family: var(--font-body);
    font-size: var(--text-xs);
    text-anchor: middle;
}

/* =====================================================================
   Phase 6: Accessibility — Focus visible styles
   ===================================================================== */
:focus-visible {
    outline: 2px solid var(--primary-600);
    outline-offset: 2px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--primary-600);
    outline-offset: 2px;
}

/* Inputs already have custom focus, override outline */
.form-input:focus-visible,
.form-select:focus-visible,
.form-textarea:focus-visible,
.quiz-input:focus-visible {
    outline: none;
}

/* Access denied page (replacing inline styles from core.js) */
.access-denied {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background-color: var(--surface-0);
    text-align: center;
    padding: var(--space-5);
    font-family: var(--font-display);
}

.access-denied-icon {
    font-size: var(--text-5xl);
    margin-bottom: var(--space-5);
}

.access-denied-title {
    font-size: var(--text-2xl);
    color: var(--ink-900);
    margin-bottom: var(--space-3);
}

.access-denied-msg {
    color: var(--ink-600);
    margin-bottom: var(--space-7);
    max-width: 300px;
    line-height: var(--leading-normal);
}

.access-denied-btn {
    background-color: var(--primary-700);
    color: white;
    text-decoration: none;
    padding: var(--space-4) var(--space-7);
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: var(--text-base);
    box-shadow: var(--shadow-md);
    transition: transform 0.2s var(--ease-spring);
}

.access-denied-btn:hover {
    transform: scale(1.02);
}

/* Icon Gradients */
.mobile-nav-link.active .mobile-nav-icon svg {
    stroke: url(#icon-grad);
}

/* Fallback for browsers without SVG gradient stroke support */
@supports not (stroke: url(#icon-grad)) {
    .mobile-nav-link.active .mobile-nav-icon svg {
        stroke: var(--primary-600);
    }
}

/* Course Cards 3D */
@media (hover: hover) {
    .course-block:hover {
        transform: perspective(1000px) rotateX(-1deg) rotateY(1deg) translateY(-4px);
        box-shadow: var(--shadow-lg);
    }

    .course-block::after {
        content: '';
        position: absolute;
        inset: 0;
        border-radius: inherit;
        background: linear-gradient(135deg, rgba(255,255,255,0.15) 0%, transparent 60%);
        opacity: 0;
        transition: opacity 0.3s ease;
        pointer-events: none;
    }

    .course-block:hover::after {
        opacity: 1;
    }
}

/* Micro-interactions */
.home-action-btn:hover {
    transform: translateY(-2px) scale(1.02);
}

/* Dark mode glass overrides */
[data-tg-color-scheme="dark"] .stat-card {
    background: rgba(46, 54, 48, 0.4);
    border-color: rgba(255, 255, 255, 0.05);
}

[data-tg-color-scheme="dark"] .quiz-card {
    background: rgba(46, 54, 48, 0.5);
    border-color: rgba(255, 255, 255, 0.05);
}

/* =====================================================================
   Gamification — Streak Badge, XP/Level, Heatmap, Animations
   ===================================================================== */

/* --- Streak Badge (Header) --- */
.streak-badge {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-3);
    background: var(--gold-100);
    border-radius: var(--radius-full);
    font-family: var(--font-display);
    font-weight: 600;
    font-size: var(--text-sm);
    color: var(--gold-500);
    animation: streakPulse 2s ease-in-out infinite;
    white-space: nowrap;
}

.streak-fire {
    font-size: var(--text-lg);
    animation: flicker 1.5s ease-in-out infinite alternate;
}

.streak-count {
    font-variant-numeric: tabular-nums;
}

@keyframes streakPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes flicker {
    0% { transform: scale(1) rotate(-3deg); }
    50% { transform: scale(1.15) rotate(3deg); }
    100% { transform: scale(1) rotate(-3deg); }
}

/* --- Profile Gamification --- */
.profile-gamification {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    margin-top: var(--space-4);
}

.profile-level-card {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-5);
    background: linear-gradient(135deg, var(--primary-50), var(--surface-raised));
    border-radius: var(--radius-lg);
    border: 1px solid var(--primary-100);
    box-shadow: var(--shadow-sm);
}

.level-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-700), var(--primary-500));
    color: #fff;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: var(--text-2xl);
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(74, 107, 80, 0.3);
}

.level-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    min-width: 0;
}

.level-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: var(--text-lg);
    color: var(--ink-900);
}

.xp-bar {
    width: 100%;
    height: 8px;
    background: var(--surface-2);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.xp-bar-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--primary-600), var(--gold-400));
    border-radius: var(--radius-full);
    transition: width 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.xp-text {
    font-size: var(--text-xs);
    color: var(--ink-500);
    font-variant-numeric: tabular-nums;
}

.profile-streak-card {
    display: flex;
    gap: var(--space-4);
    padding: var(--space-5);
    background: var(--surface-raised);
    border-radius: var(--radius-lg);
    border: 1px solid var(--surface-3);
    box-shadow: var(--shadow-sm);
}

.streak-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
}

.streak-label {
    font-size: var(--text-xs);
    color: var(--ink-500);
    text-transform: uppercase;
    letter-spacing: var(--tracking-caps);
}

.streak-value {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: var(--text-2xl);
    color: var(--gold-500);
}

/* --- Level Progress Inline --- */
.level-progress-inline {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.level-progress-label {
    font-size: var(--text-xs);
    color: var(--ink-500);
    white-space: nowrap;
}

/* =====================================================================
   Progress Cards (wrapping progress ring + heatmap)
   ===================================================================== */
.progress-card {
    background: var(--surface-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-5);
    margin-bottom: var(--space-5);
}

.progress-card__title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: var(--text-lg);
    color: var(--ink-900);
    margin-bottom: var(--space-3);
}

.progress-card__hint {
    font-size: var(--text-xs);
    color: var(--ink-400);
    margin-bottom: var(--space-4);
    line-height: 1.4;
}

.progress-card__body {
    display: flex;
    align-items: center;
    gap: var(--space-5);
}

.progress-card__body .progress-ring-container {
    flex-shrink: 0;
    margin-bottom: 0;
}

.progress-card__body .dashboard-stats {
    flex: 1;
    grid-template-columns: repeat(2, 1fr);
}

/* Heatmap summary stats row */
.heatmap-summary {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-4);
    flex-wrap: wrap;
}

.heatmap-summary__item {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.heatmap-summary__icon {
    font-size: var(--text-base);
}

.heatmap-summary__value {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: var(--text-base);
    color: var(--ink-900);
}

.heatmap-summary__label {
    font-size: var(--text-xs);
    color: var(--ink-400);
}

/* Month labels above heatmap grid */
.heatmap-months {
    display: flex;
    padding-left: 24px;
    margin-bottom: 2px;
}

.heatmap-month-label {
    font-size: 9px;
    color: var(--ink-400);
    text-align: left;
}

/* Today cell highlight */
.heatmap-cell--today {
    outline: 2px solid var(--primary-600);
    outline-offset: -1px;
    border-radius: 3px;
}

/* Day detail popup */
.heatmap-day-detail {
    position: relative;
    background: var(--surface-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-3) var(--space-4);
    margin-top: var(--space-3);
    box-shadow: var(--shadow-md);
    animation: fadeSlideUp 0.2s ease;
}

.heatmap-day-detail__date {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: var(--text-sm);
    color: var(--ink-900);
    margin-bottom: var(--space-1);
}

.heatmap-day-detail__stats {
    font-size: var(--text-xs);
    color: var(--ink-500);
    line-height: 1.6;
}

.heatmap-day-detail__close {
    position: absolute;
    top: var(--space-2);
    right: var(--space-3);
    background: none;
    border: none;
    font-size: var(--text-lg);
    color: var(--ink-400);
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

/* Trend mini-chart */
.heatmap-trend {
    margin-top: var(--space-4);
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-border);
}

.heatmap-trend__title {
    font-size: var(--text-xs);
    color: var(--ink-400);
    margin-bottom: var(--space-2);
}

.heatmap-trend__chart {
    height: 40px;
    display: flex;
    align-items: flex-end;
    gap: 2px;
}

.heatmap-trend__bar {
    flex: 1;
    background: var(--primary-200);
    border-radius: 2px 2px 0 0;
    min-height: 2px;
    transition: height 0.3s ease;
}

.heatmap-trend__bar--active {
    background: var(--primary-600);
}

.heatmap-trend__labels {
    display: flex;
    justify-content: space-between;
    margin-top: 2px;
}

.heatmap-trend__label {
    font-size: 8px;
    color: var(--ink-300);
}

@keyframes fadeSlideUp {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Mobile: stack ring + stats vertically */
@media (max-width: 400px) {
    .progress-card__body {
        flex-direction: column;
        align-items: stretch;
    }
    .progress-card__body .progress-ring-container {
        display: flex;
        justify-content: center;
        margin-bottom: var(--space-4);
    }
    .progress-card__body .dashboard-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* --- Heatmap --- */
.heatmap-container {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: var(--space-2);
}

.heatmap-wrapper {
    display: flex;
    gap: var(--space-1);
    min-width: max-content;
}

.heatmap-days {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding-top: 0;
}

.heatmap-day-label {
    height: 14px;
    font-size: 9px;
    color: var(--ink-400);
    display: flex;
    align-items: center;
    line-height: 1;
}

.heatmap-grid {
    display: grid;
    grid-template-rows: repeat(7, 14px);
    grid-auto-flow: column;
    gap: 2px;
}

.heatmap-cell {
    width: 14px;
    height: 14px;
    border-radius: 3px;
    transition: transform 0.15s ease;
}

.heatmap-cell:hover {
    transform: scale(1.3);
}

.heatmap-cell--0 {
    background: var(--surface-2);
}

.heatmap-cell--1 {
    background: var(--gold-100);
}

.heatmap-cell--2 {
    background: var(--gold-300);
}

.heatmap-cell--3 {
    background: var(--gold-400);
}

.heatmap-cell--4 {
    background: var(--gold-500);
}

.heatmap-cell--future {
    background: var(--surface-1);
    opacity: 0.4;
}

.heatmap-legend {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    margin-top: var(--space-3);
    justify-content: flex-end;
}

.heatmap-legend .heatmap-cell {
    width: 12px;
    height: 12px;
}

.heatmap-legend-label {
    font-size: 10px;
    color: var(--ink-400);
}

/* --- XP Popup Animation --- */
.xp-popup {
    position: fixed;
    z-index: 9999;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: var(--text-lg);
    color: var(--gold-500);
    pointer-events: none;
    animation: xpFloat 1s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
}

@keyframes xpFloat {
    0% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
    60% {
        opacity: 1;
        transform: translateY(-20px) scale(1.2);
    }
    100% {
        opacity: 0;
        transform: translateY(-40px) scale(0.9);
    }
}

/* --- Level Up Toast --- */
.level-up-toast {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 10000;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-5) var(--space-7);
    background: linear-gradient(135deg, var(--primary-700), var(--primary-900));
    color: #fff;
    border-radius: var(--radius-xl);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: levelUpIn 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.level-up-toast.level-up-leaving {
    animation: levelUpOut 0.4s ease-in forwards;
}

.level-up-icon {
    font-size: var(--text-3xl);
}

.level-up-text {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: var(--text-2xl);
}

@keyframes levelUpIn {
    0% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.5);
    }
    100% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }
}

@keyframes levelUpOut {
    0% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }
    100% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(1.3);
    }
}

/* =====================================================================
   Streak Bonus Modal
   ===================================================================== */
.streak-bonus-modal {
    text-align: center;
    padding: 2rem;
    max-width: 320px;
}
.streak-bonus-icon {
    font-size: 3rem;
    animation: streakBounce 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.streak-bonus-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.25rem;
    margin: 0.75rem 0 0.5rem;
    color: var(--gold-500);
}
.streak-bonus-text {
    color: var(--ink-700);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 1.5rem;
}
@keyframes streakBounce {
    0% { transform: scale(0.3); opacity: 0; }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); opacity: 1; }
}

/* --- Section title for heatmap --- */
.section-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: var(--text-lg);
    color: var(--ink-900);
    margin-bottom: var(--space-4);
}

/* =====================================================================
   Achievements
   ===================================================================== */
.achievements-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
    justify-items: stretch;
}
.achievement-badge {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: 0.375rem;
    padding: 0.625rem 0.25rem;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: transform 0.2s ease;
    width: 100%;
    min-height: 5rem;
    box-sizing: border-box;
    overflow: hidden;
}
.achievement-unlocked {
    background: var(--gold-50);
    border: 1.5px solid var(--gold-200);
}
.achievement-unlocked:active {
    transform: scale(0.95);
}
.achievement-locked {
    background: var(--surface-1);
    border: 1.5px solid var(--color-border);
    opacity: 0.6;
}
.achievement-icon {
    font-size: 1.75rem;
    line-height: 1;
}
.achievement-name {
    font-size: 0.6rem;
    font-weight: 600;
    color: var(--ink-700);
    line-height: 1.2;
    overflow-wrap: break-word;
    word-break: break-word;
    hyphens: auto;
    -webkit-hyphens: auto;
    max-width: 100%;
    text-align: center;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.achievements-counter {
    text-align: center;
    font-size: 0.8rem;
    color: var(--ink-500);
    margin-top: 0.5rem;
}

/* Achievement Toast */
.achievement-toast {
    position: fixed;
    top: 1rem;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--gold-500), var(--gold-600));
    color: white;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    z-index: 300;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    animation: achievementSlideIn 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.achievement-toast-icon {
    font-size: 1.75rem;
}
.achievement-toast-title {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    opacity: 0.85;
}
.achievement-toast-name {
    font-weight: 700;
    font-size: 0.95rem;
}
.achievement-toast-leaving {
    animation: achievementSlideOut 0.3s ease forwards;
}
@keyframes achievementSlideIn {
    from { transform: translateX(-50%) translateY(-100px); opacity: 0; }
    to { transform: translateX(-50%) translateY(0); opacity: 1; }
}
@keyframes achievementSlideOut {
    to { transform: translateX(-50%) translateY(-100px); opacity: 0; }
}

/* =====================================================================
   Onboarding Wizard
   ===================================================================== */
.onboarding-overlay {
    position: fixed;
    inset: 0;
    background: var(--surface-0);
    z-index: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    overflow-y: auto;
}
.onboarding-wizard {
    background: var(--surface-0);
    border-radius: var(--radius-2xl, 1.5rem);
    padding: 2rem 1.5rem;
    max-width: 400px;
    width: 100%;
    position: relative;
    animation: onboardingIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.onboarding-steps-indicator {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}
.onboarding-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--surface-3);
    transition: background 0.3s ease, transform 0.3s ease;
}
.onboarding-dot.active {
    background: var(--primary-500);
    transform: scale(1.3);
}
.onboarding-step {
    text-align: center;
    animation: fadeIn 0.3s ease;
}
.onboarding-icon {
    font-size: 3rem;
    margin-bottom: 0.75rem;
}
.onboarding-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--ink-900);
}
.onboarding-text {
    color: var(--ink-700);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 1.5rem;
}
.onboarding-textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-family: var(--font-body);
    font-size: 0.9rem;
    resize: none;
    background: var(--surface-1);
    color: var(--ink-900);
    margin-bottom: 0.5rem;
}
.onboarding-textarea:focus {
    outline: none;
    border-color: var(--primary-400);
}
.onboarding-hint {
    font-size: 0.8rem;
    color: var(--gold-600);
    font-weight: 600;
    margin-bottom: 1rem;
}
.onboarding-demo-card {
    background: var(--surface-1);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 1.25rem;
    margin-bottom: 1.5rem;
}
.onboarding-card-front strong {
    display: block;
    font-size: 1.5rem;
    font-family: var(--font-display);
    color: var(--primary-700);
}
.onboarding-transcription {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--ink-500);
}
.onboarding-srs-demo {
    background: var(--surface-1);
    border-radius: var(--radius-lg);
    padding: 1rem;
    margin-bottom: 1.5rem;
}
.onboarding-srs-step {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--primary-600);
    font-weight: 600;
}
.onboarding-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 0;
    color: var(--ink-700);
}
.onboarding-skip {
    position: absolute;
    top: 0.75rem;
    right: 1rem;
    background: none;
    border: none;
    color: var(--ink-500);
    font-size: 0.8rem;
    cursor: pointer;
    font-family: var(--font-body);
}
.onboarding-skip:hover {
    color: var(--ink-900);
}
@keyframes onboardingIn {
    from { transform: scale(0.9) translateY(20px); opacity: 0; }
    to { transform: scale(1) translateY(0); opacity: 1; }
}

/* --- Gamification Dark Mode --- */
[data-tg-color-scheme="dark"] .streak-badge {
    background: var(--gold-100);
    color: var(--gold-500);
}

[data-tg-color-scheme="dark"] .profile-level-card {
    background: linear-gradient(135deg, var(--primary-50), var(--surface-raised));
    border-color: var(--primary-200);
}

[data-tg-color-scheme="dark"] .level-badge {
    box-shadow: 0 4px 12px rgba(110, 168, 120, 0.25);
}

[data-tg-color-scheme="dark"] .profile-streak-card {
    background: var(--surface-raised);
    border-color: var(--surface-3);
}

[data-tg-color-scheme="dark"] .progress-card {
    background: var(--surface-1);
    border-color: var(--surface-3);
}

[data-tg-color-scheme="dark"] .heatmap-day-detail {
    background: var(--surface-1);
    border-color: var(--surface-3);
}

[data-tg-color-scheme="dark"] .heatmap-cell--0 {
    background: var(--surface-2);
}

[data-tg-color-scheme="dark"] .heatmap-cell--1 {
    background: var(--gold-100);
}

[data-tg-color-scheme="dark"] .heatmap-cell--future {
    background: var(--surface-1);
}

[data-tg-color-scheme="dark"] .level-up-toast {
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

/* Browser dark mode fallback for gamification */
@media (prefers-color-scheme: dark) {
    :root:not([data-tg-color-scheme]) .streak-badge {
        background: var(--gold-100);
        color: var(--gold-500);
    }

    :root:not([data-tg-color-scheme]) .profile-level-card {
        background: linear-gradient(135deg, var(--primary-50), var(--surface-raised));
        border-color: var(--primary-200);
    }

    :root:not([data-tg-color-scheme]) .profile-streak-card {
        background: var(--surface-raised);
        border-color: var(--surface-3);
    }

    :root:not([data-tg-color-scheme]) .heatmap-cell--0 {
        background: var(--surface-2);
    }

    :root:not([data-tg-color-scheme]) .heatmap-cell--1 {
        background: var(--gold-100);
    }

    :root:not([data-tg-color-scheme]) .heatmap-cell--future {
        background: var(--surface-1);
    }

    :root:not([data-tg-color-scheme]) .progress-card {
        background: var(--surface-1);
        border-color: var(--surface-3);
    }

    :root:not([data-tg-color-scheme]) .heatmap-day-detail {
        background: var(--surface-1);
        border-color: var(--surface-3);
    }
}

/* =====================================================================
   Phase 5: SRS Review Block
   ===================================================================== */
.srs-review-block {
    background: var(--surface-raised);
    border: 2px solid transparent;
    border-radius: var(--radius-xl);
    padding: var(--space-3) var(--space-4);
    text-align: center;
    margin-top: var(--space-3);
    background-image: linear-gradient(var(--surface-raised), var(--surface-raised)),
                      linear-gradient(135deg, var(--primary-500), var(--accent-500));
    background-origin: border-box;
    background-clip: padding-box, border-box;
    animation: srs-pulse 3s ease-in-out infinite;
    position: relative;
}

.srs-review-icon {
    font-size: var(--text-xl);
    margin-bottom: var(--space-1);
}

.srs-review-text {
    font-family: var(--font-body);
    font-size: var(--text-sm);
    color: var(--ink-700);
    margin-bottom: var(--space-2);
}

.srs-review-text strong {
    color: var(--primary-700);
    font-size: var(--text-base);
}

@keyframes srs-pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(106, 138, 112, 0); }
    50% { box-shadow: 0 0 20px 4px rgba(106, 138, 112, 0.15); }
}

[data-tg-color-scheme="dark"] .srs-review-block {
    background-image: linear-gradient(rgba(46, 54, 48, 0.9), rgba(46, 54, 48, 0.9)),
                      linear-gradient(135deg, var(--primary-500), var(--accent-500));
}

/* SRS Difficulty Buttons */
.quiz-actions--srs {
    display: flex;
    gap: var(--space-2);
    margin-top: var(--space-5);
    flex-wrap: wrap;
}

.srs-btn {
    flex: 1;
    min-width: 70px;
    padding: var(--space-3) var(--space-2);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: var(--text-sm);
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s var(--ease-spring), box-shadow 0.2s ease, border-color 0.2s ease;
    background: var(--surface-raised);
    color: var(--ink-800);
}

.srs-btn:active {
    transform: scale(0.95);
}

.srs-btn--again {
    border-color: var(--color-error);
    color: var(--color-error);
}

.srs-btn--again:hover {
    background: var(--color-error-soft);
}

.srs-btn--hard {
    border-color: var(--color-warning);
    color: var(--accent-600);
}

.srs-btn--hard:hover {
    background: var(--color-warning-soft);
}

.srs-btn--good {
    border-color: var(--color-success);
    color: var(--color-success);
}

.srs-btn--good:hover {
    background: var(--color-success-soft);
}

.srs-btn--easy {
    border-color: var(--color-info);
    color: var(--color-info);
}

.srs-btn--easy:hover {
    background: var(--color-info-soft);
}

/* =====================================================================
   Phase 6: Quiz Mode Selection
   ===================================================================== */
.quiz-mode-select {
    max-width: 500px;
    margin: 0 auto;
    padding: var(--space-6) 0;
}

.quiz-mode-title {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--space-6);
    color: var(--ink-900);
}

.quiz-mode-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.quiz-mode-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-6);
    background: var(--surface-raised);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: transform 0.3s var(--ease-spring), border-color 0.2s ease, box-shadow 0.2s ease;
    font-family: var(--font-body);
}

.quiz-mode-card:hover {
    border-color: var(--primary-400);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.quiz-mode-card:active {
    transform: scale(0.97);
}

.quiz-mode-icon {
    font-size: var(--text-3xl);
}

.quiz-mode-name {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--ink-900);
}

.quiz-mode-desc {
    font-size: var(--text-sm);
    color: var(--ink-500);
    text-align: center;
}

[data-tg-color-scheme="dark"] .quiz-mode-card {
    background: rgba(46, 54, 48, 0.4);
    border-color: rgba(255, 255, 255, 0.05);
}

[data-tg-color-scheme="dark"] .quiz-mode-card:hover {
    border-color: var(--primary-400);
}

[data-tg-color-scheme="dark"] .quiz-mode-title {
    color: var(--ink-300);
}

/* =====================================================================
   Phase 6: Multiple Choice Grid
   ===================================================================== */
.quiz-choice-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3);
    margin-top: var(--space-4);
}

.quiz-choice-btn {
    padding: var(--space-4) var(--space-3);
    background: var(--surface-raised);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: var(--text-base);
    font-weight: 500;
    color: var(--ink-800);
    cursor: pointer;
    transition: transform 0.2s var(--ease-spring), border-color 0.2s ease, background 0.2s ease;
    word-break: break-word;
    text-align: center;
    min-height: 56px;
}

.quiz-choice-btn:hover:not(:disabled) {
    border-color: var(--primary-400);
    transform: translateY(-1px);
}

.quiz-choice-btn:active:not(:disabled) {
    transform: scale(0.97);
}

.quiz-choice-btn:disabled {
    cursor: default;
    opacity: 0.7;
}

.quiz-choice-btn--correct {
    border-color: var(--color-success) !important;
    background: var(--color-success-soft) !important;
    color: var(--color-success) !important;
    opacity: 1 !important;
    animation: choice-correct 0.4s var(--ease-spring);
}

.quiz-choice-btn--wrong {
    border-color: var(--color-error) !important;
    background: var(--color-error-soft) !important;
    color: var(--color-error) !important;
    opacity: 1 !important;
    animation: quiz-shake 0.5s ease;
}

@keyframes choice-correct {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

[data-tg-color-scheme="dark"] .quiz-choice-btn {
    background: rgba(46, 54, 48, 0.4);
    border-color: rgba(255, 255, 255, 0.08);
    color: var(--ink-300);
}

/* =====================================================================
   Phase 6: Spelling Input
   ===================================================================== */
.quiz-spelling-input {
    letter-spacing: var(--tracking-wide);
}

/* =====================================================================
   Phase 6: Quiz Results Screen
   ===================================================================== */
.quiz-results {
    max-width: 500px;
    margin: 0 auto;
    text-align: center;
    padding: var(--space-8) 0;
}

.quiz-results-title {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--ink-900);
    margin-bottom: var(--space-7);
}

.quiz-results-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-6);
    margin-bottom: var(--space-6);
}

.quiz-result-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-4) var(--space-5);
    background: var(--surface-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.quiz-result-number {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--primary-700);
}

.quiz-result-label {
    font-size: var(--text-sm);
    color: var(--ink-500);
}

.quiz-result-xp {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--gold-500);
    margin-bottom: var(--space-7);
    animation: xp-results-pop 0.6s var(--ease-spring);
}

@keyframes xp-results-pop {
    0% { transform: scale(0.5); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

.quiz-results-actions {
    display: flex;
    gap: var(--space-3);
    justify-content: center;
}

[data-tg-color-scheme="dark"] .quiz-results-title {
    color: var(--ink-300);
}

[data-tg-color-scheme="dark"] .quiz-result-stat {
    background: rgba(46, 54, 48, 0.4);
    border-color: rgba(255, 255, 255, 0.05);
}

/* Quiz Detailed Results */
.quiz-results-details {
    margin-top: var(--space-5);
    text-align: left;
}

.quiz-details-title {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--ink-700);
    margin-bottom: var(--space-3);
}

.quiz-details-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    max-height: 300px;
    overflow-y: auto;
}

.quiz-detail-row {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-3);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    background: var(--surface-0);
}

.quiz-detail--correct {
    border-color: var(--primary-300);
    background: rgba(74, 107, 80, 0.05);
}

.quiz-detail--wrong {
    border-color: var(--accent-300);
    background: rgba(232, 135, 75, 0.05);
}

.quiz-detail-icon {
    font-size: var(--text-lg);
    font-weight: 700;
    flex-shrink: 0;
    width: 24px;
    text-align: center;
}

.quiz-detail--correct .quiz-detail-icon {
    color: var(--primary-700);
}

.quiz-detail--wrong .quiz-detail-icon {
    color: var(--accent-700);
}

.quiz-detail-content {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.quiz-detail-word {
    font-weight: 600;
    color: var(--ink-800);
}

.quiz-detail-answer {
    color: var(--ink-600);
    font-size: var(--text-sm);
}

.quiz-detail-user {
    color: var(--accent-700);
    font-size: var(--text-sm);
    font-style: italic;
}

[data-tg-color-scheme="dark"] .quiz-details-title {
    color: var(--ink-300);
}

[data-tg-color-scheme="dark"] .quiz-detail-row {
    background: rgba(46, 54, 48, 0.3);
}

[data-tg-color-scheme="dark"] .quiz-detail-word {
    color: var(--ink-300);
}

[data-tg-color-scheme="dark"] .quiz-detail-answer {
    color: var(--ink-500);
}

[data-tg-color-scheme="dark"] .quiz-detail-user {
    color: var(--accent-500);
}

/* SRS reveal button */
.srs-reveal-btn {
    margin-top: var(--space-4);
    width: 100%;
}

/* Browser dark mode fallback for SRS/Quiz components */
@media (prefers-color-scheme: dark) {
    :root:not([data-tg-color-scheme]) .srs-review-block {
        background-image: linear-gradient(rgba(46, 54, 48, 0.9), rgba(46, 54, 48, 0.9)),
                          linear-gradient(135deg, var(--primary-500), var(--accent-500));
    }

    :root:not([data-tg-color-scheme]) .quiz-mode-card {
        background: rgba(46, 54, 48, 0.4);
        border-color: rgba(255, 255, 255, 0.05);
    }

    :root:not([data-tg-color-scheme]) .quiz-choice-btn {
        background: rgba(46, 54, 48, 0.4);
        border-color: rgba(255, 255, 255, 0.08);
    }

    :root:not([data-tg-color-scheme]) .quiz-result-stat {
        background: rgba(46, 54, 48, 0.4);
        border-color: rgba(255, 255, 255, 0.05);
    }
}

/* =====================================================================
   Reduced motion — respect user preferences
   ===================================================================== */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* =====================================================================
   TOOLTIPS
   ===================================================================== */
.tooltip-trigger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--surface-2);
    color: var(--ink-400);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    padding: 0;
    margin-left: 6px;
    transition: background 0.2s ease, color 0.2s ease;
    flex-shrink: 0;
    -webkit-tap-highlight-color: transparent;
    font-family: var(--font-body);
    line-height: 1;
    vertical-align: middle;
}

.tooltip-trigger:hover,
.tooltip-trigger:focus-visible {
    background: var(--primary-100);
    color: var(--primary-700);
}

.tooltip-trigger:focus-visible {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
}

.tooltip-bubble {
    position: fixed;
    z-index: 1000;
    max-width: 250px;
    padding: 10px 14px;
    background: var(--surface-3);
    color: var(--ink-900);
    font-size: 13px;
    line-height: 1.5;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
    pointer-events: none;
    font-family: var(--font-body);
    backdrop-filter: blur(8px);
}

.tooltip-bubble.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.tooltip-bubble::before {
    content: '';
    position: absolute;
    top: -6px;
    left: 20px;
    width: 12px;
    height: 12px;
    background: var(--surface-3);
    transform: rotate(45deg);
    border-radius: 2px;
}

.tooltip-bubble--above::before {
    top: auto;
    bottom: -6px;
}

[data-tg-color-scheme="dark"] .tooltip-trigger {
    background: var(--surface-3);
    color: var(--ink-400);
}

[data-tg-color-scheme="dark"] .tooltip-trigger:hover,
[data-tg-color-scheme="dark"] .tooltip-trigger:focus-visible {
    background: var(--primary-900);
    color: var(--primary-200);
}

.srs-difficulty-hint {
    width: 100%;
    text-align: center;
    margin: 0 0 8px;
}

/* =====================================================================
   HELP ACCORDION
   ===================================================================== */
.help-section {
    margin-top: 16px;
}

.help-section-title {
    font-family: var(--font-display);
    font-size: 18px;
    font-weight: 600;
    color: var(--ink-900);
    margin-bottom: 12px;
}

.help-accordion {
    display: flex;
    flex-direction: column;
    gap: 2px;
    border-radius: var(--radius-xl);
    overflow: hidden;
    background: var(--surface-1);
    border: 1px solid var(--surface-2);
}

.help-item__header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    background: var(--surface-0);
    border: none;
    cursor: pointer;
    width: 100%;
    text-align: left;
    font-family: var(--font-body);
    font-size: 15px;
    font-weight: 500;
    color: var(--ink-900);
    transition: background 0.2s ease;
    -webkit-tap-highlight-color: transparent;
}

.help-item__header:hover {
    background: var(--surface-1);
}

.help-item__header:focus-visible {
    outline: 2px solid var(--primary-500);
    outline-offset: -2px;
}

.help-item__icon {
    font-size: 20px;
    flex-shrink: 0;
    width: 28px;
    text-align: center;
}

.help-item__title {
    flex: 1;
}

.help-item__chevron {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    color: var(--ink-400);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.help-item[aria-expanded="true"] .help-item__chevron {
    transform: rotate(90deg);
}

.help-item__body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
}

.help-item[aria-expanded="true"] .help-item__body {
    max-height: 800px;
}

.help-item__content {
    padding: 0 16px 16px;
    font-size: 14px;
    line-height: 1.7;
    color: var(--ink-700);
    white-space: pre-line;
}

[data-tg-color-scheme="dark"] .help-accordion {
    background: var(--surface-2);
    border-color: var(--surface-3);
}

[data-tg-color-scheme="dark"] .help-item__header {
    background: var(--surface-1);
}

[data-tg-color-scheme="dark"] .help-item__header:hover {
    background: var(--surface-2);
}

/* =====================================================================
   ACHIEVEMENT UNLOCK HINTS
   ===================================================================== */
.achievement-hint {
    display: none;
    font-size: 10px;
    color: var(--ink-900);
    background: var(--surface-3);
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    text-align: center;
    line-height: 1.3;
    position: absolute;
    bottom: calc(100% + 4px);
    left: 50%;
    transform: translateX(-50%);
    white-space: nowrap;
    max-width: 150px;
    white-space: normal;
    z-index: 10;
    pointer-events: none;
}

.achievement-locked {
    position: relative;
}

.achievement-locked:hover .achievement-hint,
.achievement-locked:active .achievement-hint {
    display: block;
}

/* =====================================================================
   MNEMO MASCOT
   ===================================================================== */

:root {
    --mnemo-body: var(--primary-700);
    --mnemo-body-light: var(--primary-200);
    --mnemo-glow: var(--accent-500);
    --mnemo-glow-max: var(--gold-400);
    --mnemo-blush: rgba(247, 147, 30, 0.25);
}

.mnemo-container {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    pointer-events: none;
    will-change: transform, opacity;
}

.mnemo-micro  { width: 24px; height: 28px; }
.mnemo-small  { width: 40px; height: 47px; }
.mnemo-medium { width: 80px; height: 93px; }
.mnemo-large  { width: 160px; height: 187px; }

.mnemo-container svg {
    width: 100%;
    height: 100%;
}

.mnemo-enter {
    animation: mnemo-fade-in 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

.mnemo-transition {
    opacity: 0.7;
    transition: opacity 0.15s ease;
}

.mnemo-bounce {
    animation: mnemo-bounce 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.mnemo-shake {
    animation: mnemo-shake 0.5s cubic-bezier(0.36, 0.07, 0.19, 0.97);
}

.mnemo-container:not(.mnemo-state-sleeping):not(.mnemo-state-proud) .mnemo-eye-l,
.mnemo-container:not(.mnemo-state-sleeping):not(.mnemo-state-proud) .mnemo-eye-r {
    animation: mnemo-blink 2s ease-in-out infinite;
    transform-origin: center;
    transform-box: fill-box;
}

@keyframes mnemo-blink {
    0%, 90%, 100% { transform: scaleY(1); }
    95% { transform: scaleY(0.1); }
}

.mnemo-container .mnemo-glow {
    transform-box: fill-box;
    transform-origin: center;
    animation: mnemo-pulse 2.5s ease-in-out infinite;
}

.mnemo-state-excited .mnemo-glow {
    animation: mnemo-pulse 1.2s ease-in-out infinite;
}

.mnemo-state-sleeping .mnemo-glow {
    animation: none;
    opacity: 0.15;
}

.mnemo-state-proud .mnemo-glow {
    animation: mnemo-pulse 1.8s ease-in-out infinite;
    filter: hue-rotate(-15deg) saturate(1.3);
}

.mnemo-container .mnemo-wing-l {
    transform-box: fill-box;
    transform-origin: center top;
    animation: mnemo-sway-l 3s ease-in-out infinite;
}

.mnemo-container .mnemo-wing-r {
    transform-box: fill-box;
    transform-origin: center top;
    animation: mnemo-sway-r 3s ease-in-out infinite;
    animation-delay: -1.5s;
}

.mnemo-bubble {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--surface-raised, var(--surface-1));
    color: var(--ink-700);
    font-family: var(--font-body);
    font-size: var(--text-xs);
    padding: 6px 12px;
    border-radius: var(--radius-md);
    box-shadow: 0 4px 12px rgba(60, 50, 30, 0.1);
    white-space: nowrap;
    text-align: center;
    animation: mnemo-bubble-in 0.35s cubic-bezier(0.34, 1.56, 0.64, 1) both;
    z-index: 10;
}

.mnemo-bubble::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 5px solid transparent;
    border-top-color: var(--surface-raised, var(--surface-1));
}

.mnemo-bubble-leave {
    animation: mnemo-bubble-out 0.25s ease-in forwards;
}

@keyframes mnemo-fade-in {
    from { opacity: 0; transform: scale(0.7) translateY(8px); }
    to   { opacity: 1; transform: scale(1) translateY(0); }
}

@keyframes mnemo-bounce {
    0%, 100% { transform: translateY(0) scale(1); }
    25%      { transform: translateY(-24px) scale(1.1); }
    45%      { transform: translateY(-8px) scale(1); }
    65%      { transform: translateY(-16px) scale(1.05); }
    85%      { transform: translateY(-4px) scale(1); }
}

@keyframes mnemo-shake {
    0%, 100% { transform: translateX(0); }
    15%      { transform: translateX(-6px) rotate(-4deg); }
    30%      { transform: translateX(5px) rotate(3deg); }
    45%      { transform: translateX(-4px) rotate(-2deg); }
    60%      { transform: translateX(3px) rotate(1deg); }
    75%      { transform: translateX(-2px); }
}

@keyframes mnemo-pulse {
    0%, 100% { opacity: 0.3; transform: scale(1); }
    50%      { opacity: 1; transform: scale(1.18); }
}

@keyframes mnemo-sway-l {
    0%, 100% { transform: rotate(-10deg); }
    50%      { transform: rotate(-25deg); }
}

@keyframes mnemo-sway-r {
    0%, 100% { transform: rotate(10deg); }
    50%      { transform: rotate(25deg); }
}

@keyframes mnemo-bubble-in {
    0%   { opacity: 0; transform: translateX(-50%) scale(0.5) translateY(8px); }
    70%  { opacity: 1; transform: translateX(-50%) scale(1.08) translateY(-2px); }
    100% { opacity: 1; transform: translateX(-50%) scale(1) translateY(0); }
}

@keyframes mnemo-bubble-out {
    to { opacity: 0; transform: translateX(-50%) translateY(-4px); }
}

@media (prefers-reduced-motion: reduce) {
    .mnemo-container,
    .mnemo-container .mnemo-glow,
    .mnemo-container .mnemo-wing-l,
    .mnemo-container .mnemo-wing-r,
    .mnemo-container .mnemo-eye-l,
    .mnemo-container .mnemo-eye-r,
    .mnemo-bounce,
    .mnemo-shake {
        animation: none !important;
        transition: none !important;
    }
    .mnemo-enter {
        animation: none;
        opacity: 1;
    }
}

[data-tg-color-scheme="dark"] .mnemo-container .mnemo-body {
    filter: brightness(1.15);
}

[data-tg-color-scheme="dark"] .mnemo-container .mnemo-glow {
    filter: brightness(1.3);
}

[data-tg-color-scheme="dark"] .mnemo-container .mnemo-wing-l,
[data-tg-color-scheme="dark"] .mnemo-container .mnemo-wing-r {
    opacity: 0.5;
}

[data-tg-color-scheme="dark"] .mnemo-bubble {
    background: var(--surface-2);
    color: var(--ink-800);
}

@media (prefers-color-scheme: dark) {
    .mnemo-container .mnemo-body { filter: brightness(1.15); }
    .mnemo-container .mnemo-glow { filter: brightness(1.3); }
    .mnemo-bubble { background: var(--surface-2); color: var(--ink-800); }
}

.dashboard-mnemo {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.dashboard-mnemo .mnemo-bubble {
    position: static;
    transform: none;
    animation: mnemo-bubble-in 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) both;
    animation-delay: 0.3s;
}

.dashboard-mnemo .mnemo-bubble::after {
    display: none;
}

.onboarding-mnemo {
    display: flex;
    justify-content: center;
    margin-bottom: var(--space-4);
}

.empty-state .mnemo-container {
    margin-bottom: var(--space-3);
}

.header-mnemo {
    display: inline-flex;
    margin-left: var(--space-2);
    vertical-align: middle;
    width: 45px;
    height: 52px;
    flex-shrink: 0;
}

/* ── Mnemo Float Overlay ── */
#mnemo-float-wrapper {
    position: fixed;
    bottom: calc(72px + env(safe-area-inset-bottom, 0px));
    right: 16px;
    z-index: 90;
    pointer-events: none;
    transition: bottom 0.4s var(--ease-spring),
                right 0.4s var(--ease-spring),
                opacity 0.3s ease,
                width 0.4s var(--ease-spring);
}

#mnemo-float-wrapper.mnemo-float--hidden {
    opacity: 0;
    pointer-events: none;
}

/* Size variants driven by data-float-size attribute */
#mnemo-float-wrapper[data-float-size="micro"]  #mnemo-float { width: 24px; height: 28px; }
#mnemo-float-wrapper[data-float-size="small"]  #mnemo-float { width: 40px; height: 47px; }
#mnemo-float-wrapper[data-float-size="medium"] #mnemo-float { width: 80px; height: 93px; }

/* Opacity variants driven by data-float-opacity attribute */
#mnemo-float-wrapper[data-float-opacity="dim"] { opacity: 0.55; }
#mnemo-float-wrapper[data-float-opacity="mid"] { opacity: 0.80; }

/* Speech bubble in float context: anchor to right edge so it never overflows screen */
#mnemo-float-wrapper .mnemo-bubble {
    left: auto;
    right: 0;
    transform: none;
    animation: mnemo-bubble-float-in 0.35s cubic-bezier(0.34, 1.56, 0.64, 1) both;
    max-width: calc(100vw - 32px);
    white-space: normal;
    text-align: center;
}
#mnemo-float-wrapper .mnemo-bubble::after {
    left: auto;
    right: 14px;
    transform: none;
}
#mnemo-float-wrapper .mnemo-bubble-leave {
    animation: mnemo-bubble-float-out 0.25s ease-in forwards;
}
@keyframes mnemo-bubble-float-in {
    0%   { opacity: 0; transform: scale(0.5) translateY(8px); }
    70%  { opacity: 1; transform: scale(1.08) translateY(-2px); }
    100% { opacity: 1; transform: scale(1) translateY(0); }
}
@keyframes mnemo-bubble-float-out {
    to { opacity: 0; transform: translateY(-4px); }
}

/* Bubble variant: appears below mascot (used when mascot is near top of screen) */
.mnemo-bubble--below {
    bottom: auto;
    top: 110%;
    animation: mnemo-bubble-in-below 0.35s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

.mnemo-bubble--below::after {
    top: auto;
    bottom: 100%;
    border-top-color: transparent;
    border-bottom-color: var(--surface-raised, var(--surface-1));
}

@keyframes mnemo-bubble-in-below {
    0%   { opacity: 0; transform: scale(0.5) translateY(-8px); }
    70%  { opacity: 1; transform: scale(1.08) translateY(2px); }
    100% { opacity: 1; transform: scale(1) translateY(0); }
}

/* Float wrapper: bubble below when mascot is near top of screen */
#mnemo-float-wrapper.mnemo-float--bubble-below .mnemo-bubble {
    bottom: auto;
    top: calc(100% + 4px);
    animation: mnemo-bubble-float-in-below 0.35s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}
#mnemo-float-wrapper.mnemo-float--bubble-below .mnemo-bubble::after {
    top: auto;
    bottom: 100%;
    border-top-color: transparent;
    border-bottom-color: var(--surface-raised, var(--surface-1));
}
@keyframes mnemo-bubble-float-in-below {
    0%   { opacity: 0; transform: scale(0.5) translateY(-8px); }
    70%  { opacity: 1; transform: scale(1.08) translateY(2px); }
    100% { opacity: 1; transform: scale(1) translateY(0); }
}
#mnemo-float-wrapper.mnemo-float--bubble-below .mnemo-bubble-leave {
    animation: mnemo-bubble-float-out 0.25s ease-in forwards;
}

/* Float wrapper: bubble to the left when mascot is near top-right */
#mnemo-float-wrapper.mnemo-float--bubble-left .mnemo-bubble {
    bottom: auto;
    top: 50%;
    right: calc(100% + 2px);
    left: auto;
    transform: translateY(-50%);
    text-align: center;
    max-width: 110px;
    animation: mnemo-bubble-float-in-left 0.35s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}
#mnemo-float-wrapper.mnemo-float--bubble-left .mnemo-bubble::after {
    top: 50%;
    bottom: auto;
    left: auto;
    right: -6px;
    transform: translateY(-50%) rotate(-90deg);
    border-top-color: var(--surface-raised, var(--surface-1));
    border-bottom-color: transparent;
}
@keyframes mnemo-bubble-float-in-left {
    0%   { opacity: 0; transform: translateY(-50%) scale(0.5) translateX(8px); }
    70%  { opacity: 1; transform: translateY(-50%) scale(1.08) translateX(-2px); }
    100% { opacity: 1; transform: translateY(-50%) scale(1) translateX(0); }
}
#mnemo-float-wrapper.mnemo-float--bubble-left .mnemo-bubble-leave {
    animation: mnemo-bubble-float-out 0.25s ease-in forwards;
}