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

:root {
    /* ===== Design Tokens (from DESIGN.md / SKILL.md) ===== */

    /* Typography - din-round -> Nunito (free rounded equivalent) */
    --font-family-primary: 'Nunito', 'din-round', sans-serif;
    --font-size-xs: 13px;
    --font-size-sm: 15px;
    --font-size-md: 17px;   /* base */
    --font-size-lg: 19px;
    --font-size-xl: 32px;
    --font-size-2xl: 48px;
    --font-size-3xl: 64px;
    --font-weight-base: 500;
    --font-weight-bold: 700;
    --font-weight-heavy: 800;
    --line-height-base: 1.5;

    /* Spacing scale */
    --space-1: 8px;
    --space-2: 12px;
    --space-3: 16px;
    --space-4: 24px;
    --space-5: 40px;
    --space-6: 64px;

    /* Radius + motion */
    --radius-xs: 12px;
    --radius-sm: 16px;
    --radius-pill: 999px;
    --motion-instant: 200ms;
    --easing: cubic-bezier(0.4, 0, 0.2, 1);

    /* ===== Semantic Color Tokens (Duolingo brand) ===== */
    --color-brand: #58cc02;        /* Duolingo green */
    --color-brand-hover: #61E002;
    --color-brand-shadow: #58a700; /* darker green for 3D button base */
    --color-accent: #1cb0f6;       /* sky blue */
    --color-accent-shadow: #1899d6;
    --color-feather-green: #89e219;
    --color-danger: #ff4b4b;
    --color-danger-shadow: #ea2b2b;
    --color-gold: #ffc800;

    --color-text-primary: #3c3c3c;
    --color-text-secondary: #777777;
    --color-text-inverse: #ffffff;
    --color-surface-base: #ffffff;
    --color-surface-muted: #f7f7f7;
    --color-border: #e5e5e5;
    --color-border-strong: #afafaf;

    --color-focus-ring: #1cb0f6;

    /* Aliases for legacy class usage across the codebase */
    --primary-color: var(--color-brand);
    --primary-dark: var(--color-brand-shadow);
    --secondary-color: var(--color-accent);
    --accent-color: var(--color-feather-green);
    --dark-color: #4b4b4b;
    --light-color: var(--color-surface-muted);
    --success-color: var(--color-brand);
    --text-color: var(--color-text-primary);
    --muted-color: var(--color-text-secondary);
    --border-radius: var(--radius-xs);
    --transition: all var(--motion-instant) var(--easing);
    --shadow: 0 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.12);
}

body {
    font-family: var(--font-family-primary);
    line-height: var(--line-height-base);
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-base);
    color: var(--color-text-primary);
    background-color: var(--color-surface-base);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Global focus-visible ring (WCAG 2.2 AA, keyboard-first) */
:focus-visible {
    outline: 3px solid var(--color-focus-ring);
    outline-offset: 2px;
    border-radius: 4px;
}
/* Remove outline only when focus-visible is supported and not active via keyboard */
:focus:not(:focus-visible) {
    outline: none;
}

/* Respect reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
        scroll-behavior: auto !important;
    }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation - clean white header, Duolingo style */
.navbar {
    background-color: var(--color-surface-base);
    padding: var(--space-2) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 2px solid var(--color-border);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand h1 {
    color: var(--color-brand);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-heavy);
    letter-spacing: -0.5px;
}

/* Brand link (logo + name, clickable, goes home) */
.brand-link {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
    color: var(--color-brand);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-heavy);
    letter-spacing: -0.5px;
    line-height: 1;
    transition: var(--transition);
}
.brand-link:hover { color: var(--color-brand-shadow); transform: translateY(-1px); }
.brand-flag svg { display: block; border-radius: 3px; box-shadow: 0 1px 2px rgba(0,0,0,0.08); }
.brand-name { font-family: var(--font-family-primary); }

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--space-1);
}

.nav-menu a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: var(--transition);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-xs);
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-menu a:hover {
    background-color: var(--color-surface-muted);
    color: var(--color-text-primary);
}

.nav-menu a.active {
    color: var(--color-accent);
    background-color: rgba(28, 176, 246, 0.1);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    background: none;
    border: none;
    padding: var(--space-1);
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--color-text-secondary);
    margin: 3px 0;
    border-radius: 2px;
    transition: var(--transition);
}

/* Hero Section - clean light Duolingo style */
.hero {
    background: var(--color-surface-base);
    color: var(--color-text-primary);
    padding: var(--space-6) 0;
    text-align: center;
}

.hero-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-heavy);
    margin-bottom: var(--space-3);
    color: var(--color-text-primary);
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-5);
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-bold);
}

.hero-buttons {
    display: flex;
    gap: var(--space-3);
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons - chunky 3D Duolingo style */
.btn {
    padding: var(--space-2) var(--space-4);
    border: none;
    border-radius: var(--radius-xs);
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: filter var(--motion-instant) var(--easing),
                transform var(--motion-instant) var(--easing);
    font-family: var(--font-family-primary);
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-heavy);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    line-height: 1.2;
}

.btn-primary {
    background-color: var(--color-brand);
    color: var(--color-text-inverse);
    box-shadow: 0 4px 0 var(--color-brand-shadow);
}

.btn-primary:hover {
    background-color: var(--color-brand-hover);
    filter: brightness(1.02);
}

.btn-primary:active {
    transform: translateY(4px);
    box-shadow: 0 0 0 var(--color-brand-shadow);
}

.btn-secondary {
    background-color: var(--color-surface-base);
    color: var(--color-accent);
    box-shadow: 0 4px 0 var(--color-border);
    border: 2px solid var(--color-border);
}

.btn-secondary:hover {
    background-color: var(--color-surface-muted);
}

.btn-secondary:active {
    transform: translateY(4px);
    box-shadow: 0 0 0 var(--color-border);
}

.btn:disabled,
.btn[aria-disabled="true"] {
    background-color: var(--color-border);
    color: var(--color-text-secondary);
    box-shadow: 0 4px 0 var(--color-border-strong);
    cursor: not-allowed;
    pointer-events: none;
}

.btn-large {
    padding: var(--space-3) var(--space-5);
    font-size: var(--font-size-lg);
}

.btn-block {
    width: 100%;
    display: block;
}

/* Features Section */
.features {
    padding: var(--space-6) 0;
    background: var(--color-surface-muted);
}

.section-title {
    text-align: center;
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-heavy);
    margin-bottom: var(--space-5);
    color: var(--color-text-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-4);
}

.feature-card {
    background: var(--color-surface-base);
    padding: var(--space-4);
    border-radius: var(--radius-sm);
    text-align: center;
    transition: var(--transition);
    border: 2px solid var(--color-border);
    border-bottom-width: 4px;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-border-strong);
}

.feature-card i {
    font-size: 3rem;
    color: var(--color-brand);
    margin-bottom: var(--space-3);
}

.feature-card h3 {
    margin-bottom: var(--space-2);
    color: var(--color-text-primary);
    font-weight: var(--font-weight-heavy);
}

.feature-card p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
}

/* JLPT Levels */
.jlpt-levels {
    background-color: var(--color-surface-base);
    padding: var(--space-6) 0;
}

.levels-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-4);
    margin-top: var(--space-4);
}

.level-card {
    background: var(--color-surface-base);
    padding: var(--space-4);
    border-radius: var(--radius-sm);
    border: 2px solid var(--color-border);
    border-bottom-width: 4px;
    transition: var(--transition);
}

.level-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-border-strong);
}

.level-card.n5 {
    border-top: 6px solid var(--color-brand);
}

.level-card.n4 {
    border-top: 6px solid var(--color-accent);
}

.level-card h3 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-heavy);
    margin-bottom: var(--space-1);
    color: var(--color-text-primary);
}

.level-card p {
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-bold);
}

.level-card ul {
    list-style: none;
    margin: var(--space-3) 0;
}

.level-card ul li {
    padding: var(--space-1) 0;
    padding-left: var(--space-4);
    position: relative;
    font-weight: var(--font-weight-bold);
}

.level-card ul li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-brand);
    font-weight: var(--font-weight-heavy);
}

/* CTA Section */
.cta {
    background: var(--color-brand);
    color: var(--color-text-inverse);
    padding: var(--space-6) 0;
    text-align: center;
}

.cta h2 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-heavy);
    margin-bottom: var(--space-3);
}

.cta p {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-4);
    font-weight: var(--font-weight-bold);
}

.cta .btn-large {
    background: var(--color-surface-base);
    color: var(--color-brand);
    box-shadow: 0 4px 0 rgba(0, 0, 0, 0.15);
}

/* Page Header */
.page-header {
    background: var(--color-surface-muted);
    color: var(--color-text-primary);
    padding: var(--space-5) 0;
    text-align: center;
    border-bottom: 2px solid var(--color-border);
}

.page-header h1 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-heavy);
    margin-bottom: var(--space-1);
    color: var(--color-text-primary);
}

.page-header p {
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-bold);
}

/* Content Section */
.content-section {
    padding: 3rem 0;
    min-height: 60vh;
    background: white;
}

/* Content section spacing handled above; filter/card styles defined later */


/* Footer */
.footer {
    background-color: var(--color-surface-muted);
    color: var(--color-text-primary);
    padding: var(--space-5) 0 var(--space-3);
    margin-top: var(--space-6);
    border-top: 2px solid var(--color-border);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-4);
    margin-bottom: var(--space-4);
}

.footer-section h3 {
    margin-bottom: var(--space-2);
    color: var(--color-text-primary);
    font-weight: var(--font-weight-heavy);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--space-1);
}

.footer-section a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: var(--transition);
    font-weight: var(--font-weight-bold);
}

.footer-section a:hover {
    color: var(--color-accent);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-sm);
}

/* Login Page */
.login-container {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--color-surface-muted);
    padding: var(--space-3);
}

.login-box {
    background: var(--color-surface-base);
    padding: var(--space-5);
    border-radius: var(--radius-sm);
    border: 2px solid var(--color-border);
    border-bottom-width: 4px;
    width: 100%;
    max-width: 420px;
}

.login-box h2 {
    text-align: center;
    color: var(--color-text-primary);
    margin-bottom: var(--space-4);
    font-weight: var(--font-weight-heavy);
}

.form-group {
    margin-bottom: var(--space-3);
}

.form-group label {
    display: block;
    margin-bottom: var(--space-1);
    color: var(--color-text-primary);
    font-weight: var(--font-weight-bold);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: var(--space-2);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xs);
    font-family: var(--font-family-primary);
    font-size: var(--font-size-md);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(28, 176, 246, 0.2);
}

.error-message {
    color: var(--color-danger);
    margin-top: var(--space-2);
    text-align: center;
    font-weight: var(--font-weight-bold);
    display: none;
}

.back-link {
    display: block;
    text-align: center;
    margin-top: var(--space-3);
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: var(--font-weight-bold);
}

.back-link:hover {
    color: var(--color-accent);
}

/* Charts */
.chart-tabs {
    display: flex;
    gap: var(--space-1);
    margin-bottom: var(--space-4);
    border-bottom: 2px solid var(--color-border);
}

.tab-btn {
    padding: var(--space-2) var(--space-4);
    border: none;
    background: transparent;
    cursor: pointer;
    font-family: var(--font-family-primary);
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-heavy);
    color: var(--color-text-secondary);
    border-bottom: 3px solid transparent;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tab-btn:hover {
    color: var(--color-text-primary);
}

.tab-btn.active {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}

.chart-table {
    width: 100%;
    background: var(--color-surface-base);
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 2px solid var(--color-border);
}

.chart-table table {
    width: 100%;
    border-collapse: collapse;
}

.chart-table th,
.chart-table td {
    padding: var(--space-2);
    text-align: center;
    border: 1px solid var(--color-border);
}

.chart-table th {
    background: var(--color-surface-muted);
    color: var(--color-text-primary);
    font-weight: var(--font-weight-heavy);
}

.chart-table .character {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
}

.chart-table .romaji {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}

/* Resources Categories */
.category-section {
    margin-bottom: 3rem;
}

.category-section h2 {
    color: var(--dark-color);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid var(--primary-color);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.7);
}

.modal-content {
    background-color: white;
    margin: 5% auto;
    padding: 2rem;
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 800px;
    max-height: 80vh;
    overflow-y: auto;
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover {
    color: var(--primary-color);
}

/* Quiz Styles */
.quiz-question {
    margin-bottom: 2rem;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.quiz-option {
    padding: 1rem;
    border: 2px solid var(--accent-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.quiz-option:hover {
    background: var(--secondary-color);
}

.quiz-option.selected {
    background: var(--accent-color);
    border-color: var(--primary-color);
}

.quiz-option.correct {
    background: #4CAF50;
    color: white;
    border-color: #4CAF50;
}

.quiz-option.incorrect {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.quiz-result {
    text-align: center;
    padding: 2rem;
}

.quiz-score {
    font-size: 3rem;
    color: var(--primary-color);
    margin: 1rem 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 64px;
        flex-direction: column;
        background-color: var(--color-surface-base);
        width: 100%;
        text-align: center;
        transition: left var(--motion-instant) var(--easing);
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.08);
        border-bottom: 2px solid var(--color-border);
        padding: var(--space-3) 0;
        gap: 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu a {
        display: block;
        padding: var(--space-2) var(--space-3);
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .features-grid,
    .notes-grid,
    .vocab-grid,
    .practice-grid,
    .listening-grid,
    .resources-grid {
        grid-template-columns: 1fr;
    }

    .filter-bar {
        flex-direction: column;
    }

    .filter-btn,
    .search-input {
        width: 100%;
    }

    .chart-tabs {
        flex-direction: column;
    }

    .tab-btn {
        border-bottom: 2px solid var(--accent-color);
    }

    .tab-btn.active {
        border-left: 3px solid var(--primary-color);
    }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }

.hidden {
    display: none;
}

/* Filter Bar */
.filter-bar {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    align-items: center;
}

.filter-btn {
    padding: var(--space-1) var(--space-3);
    border: 2px solid var(--color-border);
    border-bottom-width: 3px;
    background: var(--color-surface-base);
    color: var(--color-text-secondary);
    border-radius: var(--radius-xs);
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-family-primary);
    font-weight: var(--font-weight-heavy);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.filter-btn:hover {
    background: var(--color-surface-muted);
    border-color: var(--color-border-strong);
}

.filter-btn.active {
    background: rgba(28, 176, 246, 0.1);
    color: var(--color-accent);
    border-color: var(--color-accent);
}

.search-input {
    padding: var(--space-2) var(--space-3);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xs);
    flex: 1;
    min-width: 200px;
    font-family: var(--font-family-primary);
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-base);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-accent);
}

/* Grid Layouts */
.notes-grid,
.vocab-grid,
.practice-grid,
.listening-grid,
.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-4);
}

/* Card Styles */
.card {
    background: var(--color-surface-base);
    padding: var(--space-4);
    border-radius: var(--radius-sm);
    border: 2px solid var(--color-border);
    border-bottom-width: 4px;
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-4px);
    border-color: var(--color-border-strong);
}

.card h3 {
    color: var(--color-text-primary);
    margin-bottom: var(--space-1);
    font-weight: var(--font-weight-heavy);
}

.card .badge {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    background: var(--light-color);
    color: var(--dark-color);
    border-radius: 20px;
    font-size: 0.85rem;
    margin-right: 0.5rem;
}

/* ===== Notes Browser ===== */
.breadcrumb {
    margin-bottom: 1.5rem;
    font-size: 1rem;
    color: var(--muted-color);
}
.breadcrumb a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb .sep { margin: 0 0.5rem; color: var(--muted-color); }

.lessons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: var(--space-4);
}

.lesson-card {
    background: var(--color-surface-base);
    border: 2px solid var(--color-border);
    border-bottom-width: 4px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}
.lesson-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-border-strong);
}

/* Cover image area (top of the box) */
.lesson-cover {
    position: relative;
    width: 100%;
    aspect-ratio: 4 / 3;
    background: var(--color-surface-muted);
    overflow: hidden;
}
.lesson-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
    display: block;
    transition: transform var(--motion-instant) var(--easing);
}
.lesson-card:hover .lesson-cover img {
    transform: scale(1.04);
}
.lesson-cover-empty {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-border-strong);
    font-size: 2.5rem;
}

/* Number badge on the cover */
.lesson-badge {
    position: absolute;
    top: var(--space-2);
    left: var(--space-2);
    min-width: 34px;
    height: 34px;
    padding: 0 var(--space-1);
    border-radius: var(--radius-xs);
    background: var(--color-brand);
    box-shadow: 0 2px 0 var(--color-brand-shadow);
    color: var(--color-text-inverse);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-heavy);
}

/* Details below the cover */
.lesson-body {
    padding: var(--space-3);
}
.lesson-body h3 {
    margin: 0 0 var(--space-1);
    color: var(--color-text-primary);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-heavy);
}
.lesson-body p {
    margin: 0;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    display: flex;
    align-items: center;
    gap: var(--space-1);
}
.lesson-body p i { color: var(--color-accent); }

.empty-msg {
    text-align: center;
    color: var(--muted-color);
    padding: 3rem 1rem;
    font-size: 1.05rem;
}

/* Image stack for a lesson */
.images-stack {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}
.note-page {
    margin: 0;
    background: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}
.note-page img {
    width: 100%;
    display: block;
    cursor: zoom-in;
    transition: var(--transition);
}
.note-page figcaption {
    padding: 0.7rem 1rem;
    color: var(--muted-color);
    font-size: 0.9rem;
    border-top: 1px solid #eef2f7;
}

/* Lightbox */
.lightbox {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.92);
    z-index: 3000;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}
.lightbox.open { display: flex; }
.lightbox-img {
    max-width: 95%;
    max-height: 92vh;
    border-radius: 6px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.5);
}
.lightbox-close {
    position: absolute;
    top: 20px;
    right: 30px;
    color: white;
    font-size: 2.5rem;
    cursor: pointer;
    line-height: 1;
}
.lightbox-close:hover { color: var(--accent-color); }

/* ===== Vocabulary ===== */
/* Lesson box (row style, matches Notes browse) */
.vocab-lesson-card {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
}
.vocab-lesson-num {
    width: 52px;
    height: 52px;
    flex-shrink: 0;
    border-radius: var(--radius-xs);
    background: var(--color-brand);
    box-shadow: 0 3px 0 var(--color-brand-shadow);
    color: var(--color-text-inverse);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-heavy);
}
.vocab-lesson-card .lesson-body { flex: 1; }
.vocab-lesson-card .lesson-arrow {
    color: var(--color-text-secondary);
    transition: var(--transition);
}
.vocab-lesson-card:hover .lesson-arrow {
    color: var(--color-brand);
    transform: translateX(4px);
}

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

.vocab-card {
    position: relative;
    background: var(--color-surface-base);
    border: 2px solid var(--color-border);
    border-bottom-width: 4px;
    border-radius: var(--radius-sm);
    padding: var(--space-3);
    transition: var(--transition);
}
.vocab-card:hover {
    transform: translateY(-3px);
    border-color: var(--color-border-strong);
}
.vocab-word {
    font-size: 1.6rem;
    font-weight: var(--font-weight-heavy);
    color: var(--color-text-primary);
    margin-bottom: 2px;
}
.vocab-reading {
    color: var(--color-accent);
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-1);
}
.vocab-meaning {
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-bold);
}

/* Source label shown on search results (which level/lesson the word is from) */
.vocab-source {
    margin-top: var(--space-2);
    padding-top: var(--space-1);
    border-top: 1px dashed var(--color-border);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-heavy);
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Category tags */
.cat-tag {
    position: absolute;
    top: var(--space-2);
    right: var(--space-2);
    font-size: 11px;
    font-weight: var(--font-weight-heavy);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 2px 8px;
    border-radius: var(--radius-pill);
    color: #fff;
}
.cat-noun { background: #1cb0f6; }
.cat-verb { background: #58cc02; }
.cat-adj { background: #ff9600; }
.cat-adv { background: #ce82ff; }
.cat-phrase { background: #ff4b4b; }
.cat-particle { background: #2b70c9; }
.cat-counter { background: #00b8a3; }
.cat-other { background: #afafaf; }


/* ===== Listening tracks ===== */
.track-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    max-width: 760px;
    margin: 0 auto;
}

.track-item {
    background: var(--color-surface-base);
    border: 2px solid var(--color-border);
    border-bottom-width: 4px;
    border-radius: var(--radius-sm);
    padding: var(--space-3);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    flex-wrap: wrap;
    transition: var(--transition);
}
.track-item:hover {
    border-color: var(--color-border-strong);
}

.track-info {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    min-width: 160px;
}
.track-num {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
    border-radius: var(--radius-xs);
    background: var(--color-brand);
    box-shadow: 0 2px 0 var(--color-brand-shadow);
    color: var(--color-text-inverse);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-heavy);
}
.track-name {
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
}

.track-item audio {
    flex: 1;
    min-width: 240px;
    height: 40px;
}

@media (max-width: 600px) {
    .track-item audio { width: 100%; flex-basis: 100%; }
}

/* ===== Resource cards (PDFs grid) ===== */
.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: var(--space-3);
    align-items: stretch;
}

.resource-card {
    background: var(--color-surface-base);
    border: 2px solid var(--color-border);
    border-bottom-width: 4px;
    border-radius: var(--radius-sm);
    padding: var(--space-4) var(--space-3);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
    transition: var(--transition);
    height: 100%;
}
.resource-card:hover {
    transform: translateY(-3px);
    border-color: var(--color-border-strong);
}

.resource-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-xs);
    background: #fee2e2;
    color: #dc2626;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    flex-shrink: 0;
}

.resource-title {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-heavy);
    color: var(--color-text-primary);
    margin: 0;
    line-height: 1.3;
    word-break: break-word;
    /* Reserve room for ~3 lines so cards align nicely */
    min-height: calc(1.3em * 2);
}

.resource-card .badge {
    background: var(--color-surface-muted);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    font-size: 0.72rem;
    font-weight: var(--font-weight-heavy);
    padding: 2px 10px;
    border-radius: var(--radius-pill);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.resource-card .badge:not(.badge-muted) {
    background: rgba(28, 176, 246, 0.1);
    color: var(--color-accent);
    border-color: transparent;
}

.resource-actions {
    margin-top: auto;
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
    width: 100%;
    padding-top: var(--space-2);
}
.resource-actions .btn {
    flex: 1;
    min-width: 0;
    padding: var(--space-2) var(--space-2);
    font-size: var(--font-size-sm);
    text-align: center;
}
.resource-actions .btn i { margin-right: 4px; }

@media (max-width: 480px) {
    .resource-actions { flex-direction: column; }
    .resource-actions .btn { width: 100%; }
}

/* ===== Animations ===== */
@keyframes fade-up {
    from { opacity: 0; transform: translateY(18px); }
    to { opacity: 1; transform: none; }
}
@keyframes fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}
@keyframes float-soft {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
}
@keyframes pulse-soft {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.04); }
}

/* Hero gentle entrance */
.hero-title { animation: fade-up 0.7s var(--easing) both; }
.hero-subtitle { animation: fade-up 0.7s var(--easing) 0.1s both; }
.hero-buttons { animation: fade-up 0.7s var(--easing) 0.2s both; }

/* Brand subtle hover */
.brand-link:hover .brand-flag { animation: pulse-soft 0.5s var(--easing); }

/* Scroll reveal — JS toggles .is-visible */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.6s var(--easing), transform 0.6s var(--easing); }
.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
    .reveal { opacity: 1; transform: none; transition: none; }
    .hero-title, .hero-subtitle, .hero-buttons { animation: none; }
}

/* ===== Stats numbers row ===== */
.stats-section {
    background: var(--color-surface-base);
    padding: var(--space-5) 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}
.stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--space-4);
    text-align: center;
}
.stat-num {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-heavy);
    color: var(--color-brand);
    line-height: 1;
}
.stat-label {
    margin-top: 0.5rem;
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ===== How it works ===== */
.how-section { padding: var(--space-6) 0; background: var(--color-surface-muted); }
.how-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-4);
    margin-top: var(--space-4);
}
.how-step {
    background: var(--color-surface-base);
    border: 2px solid var(--color-border);
    border-bottom-width: 4px;
    border-radius: var(--radius-sm);
    padding: var(--space-4);
    transition: var(--transition);
}
.how-step:hover { transform: translateY(-4px); border-color: var(--color-border-strong); }
.how-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-xs);
    background: var(--color-brand);
    color: var(--color-text-inverse);
    font-weight: var(--font-weight-heavy);
    font-size: var(--font-size-lg);
    box-shadow: 0 3px 0 var(--color-brand-shadow);
    margin-bottom: var(--space-2);
}
.how-step h3 { color: var(--color-text-primary); margin-bottom: 0.5rem; }
.how-step p { color: var(--color-text-secondary); font-weight: var(--font-weight-bold); margin-bottom: 0.8rem; }
.how-link {
    color: var(--color-accent);
    font-weight: var(--font-weight-heavy);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    transition: var(--transition);
}
.how-link:hover { gap: 0.7rem; color: var(--color-brand); }

/* ===== Kana preview ===== */
.kana-preview-section { padding: var(--space-6) 0; }
.section-sub { text-align: center; color: var(--color-text-secondary); margin-bottom: var(--space-4); font-weight: var(--font-weight-bold); }
.kana-preview-grid {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: var(--space-3);
    max-width: 720px;
    margin: 0 auto;
}
.kana-card {
    aspect-ratio: 1;
    background: var(--color-surface-base);
    border: 2px solid var(--color-border);
    border-bottom-width: 4px;
    border-radius: var(--radius-sm);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}
.kana-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-brand);
    background: rgba(88, 204, 2, 0.05);
}
.kana-card:hover .kana-char { animation: float-soft 1.2s var(--easing) infinite; color: var(--color-brand); }
.kana-char { font-size: 2.4rem; font-weight: var(--font-weight-heavy); color: var(--color-text-primary); }
.kana-romaji { color: var(--color-text-secondary); font-weight: var(--font-weight-bold); font-size: var(--font-size-sm); margin-top: 0.25rem; }
@media (max-width: 520px) {
    .kana-preview-grid { grid-template-columns: repeat(5, 1fr); gap: var(--space-1); }
    .kana-char { font-size: 1.6rem; }
}

/* ===== FAQ ===== */
.faq-section { padding: var(--space-6) 0; background: var(--color-surface-muted); }
.faq-list { max-width: 760px; margin: 0 auto; display: flex; flex-direction: column; gap: var(--space-2); }
.faq-item {
    background: var(--color-surface-base);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 0;
    overflow: hidden;
    transition: var(--transition);
}
.faq-item[open] { border-color: var(--color-brand); }
.faq-item summary {
    list-style: none;
    cursor: pointer;
    padding: var(--space-3) var(--space-4);
    font-weight: var(--font-weight-heavy);
    color: var(--color-text-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
    content: "+";
    font-size: 1.4rem;
    line-height: 1;
    color: var(--color-text-secondary);
    transition: transform 0.25s ease;
}
.faq-item[open] summary::after { content: "−"; color: var(--color-brand); }
.faq-item p {
    padding: 0 var(--space-4) var(--space-3);
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-bold);
    margin: 0;
    animation: fade-in 0.3s ease;
}

/* ============================================================
   Practice Tools page
   ============================================================ */
.tool-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}
.tool-tab {
    background: var(--color-surface-base);
    border: 2px solid var(--color-border);
    border-bottom-width: 4px;
    border-radius: var(--radius-xs);
    padding: 0.7rem 1.1rem;
    font-family: var(--font-family-primary);
    font-weight: var(--font-weight-heavy);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: var(--transition);
}
.tool-tab i { margin-right: 0.4rem; }
.tool-tab:hover { transform: translateY(-2px); border-color: var(--color-border-strong); }
.tool-tab.active {
    background: var(--color-brand);
    color: var(--color-text-inverse);
    border-color: var(--color-brand-shadow);
}

.tool-panel { display: none; animation: fade-in 0.3s ease; }
.tool-panel.active { display: block; }

.tool-card {
    background: var(--color-surface-base);
    border: 2px solid var(--color-border);
    border-bottom-width: 4px;
    border-radius: var(--radius-sm);
    padding: var(--space-4);
}
.tool-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-heavy);
    color: var(--color-text-primary);
    margin: 0 0 0.4rem;
}
.tool-title i { color: var(--color-brand); margin-right: 0.4rem; }
.tool-desc {
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-3);
}
.tool-desc code {
    background: var(--color-surface-muted);
    padding: 1px 6px;
    border-radius: 6px;
    font-size: 0.9em;
}

/* ---------- Sandbox ---------- */
.sandbox-controls {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    gap: var(--space-3);
    margin-bottom: var(--space-3);
}
.sb-field { display: flex; flex-direction: column; gap: 0.3rem; font-weight: var(--font-weight-heavy); font-size: var(--font-size-sm); color: var(--color-text-secondary); }
.sb-field input[type="text"] {
    width: 90px;
    font-size: 1.6rem;
    text-align: center;
    padding: 0.3rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xs);
    font-family: var(--font-family-primary);
}
.sb-field input[type="range"] { width: 140px; }
.sb-field input[type="color"] { width: 48px; height: 38px; border: 2px solid var(--color-border); border-radius: var(--radius-xs); background: none; cursor: pointer; }
.sb-toggle { display: inline-flex; align-items: center; gap: 0.4rem; font-weight: var(--font-weight-heavy); font-size: var(--font-size-sm); color: var(--color-text-secondary); cursor: pointer; }

.sandbox-wrap {
    display: flex;
    justify-content: center;
    margin: 0 auto var(--space-3);
}
#sandboxCanvas {
    width: 100%;
    max-width: 420px;
    aspect-ratio: 1 / 1;
    height: auto;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    touch-action: none;
    background: #fff;
    cursor: crosshair;
}
.sandbox-actions { display: flex; flex-wrap: wrap; gap: var(--space-2); justify-content: center; }
.quick-chars { display: flex; flex-wrap: wrap; gap: 0.5rem; justify-content: center; margin-top: var(--space-3); }
.quick-char {
    min-width: 44px;
    height: 44px;
    font-size: 1.4rem;
    border: 2px solid var(--color-border);
    border-bottom-width: 3px;
    border-radius: var(--radius-xs);
    background: var(--color-surface-base);
    cursor: pointer;
    transition: var(--transition);
}
.quick-char:hover { border-color: var(--color-brand); transform: translateY(-2px); background: rgba(88,204,2,0.06); }

/* ---------- Converter / Numbers ---------- */
.tool-textarea {
    width: 100%;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xs);
    padding: var(--space-3);
    font-family: var(--font-family-primary);
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-bold);
    resize: vertical;
    margin-bottom: var(--space-3);
}
.tool-textarea:focus, .quiz-answer:focus, .tool-select:focus { outline: none; border-color: var(--color-brand); }
.converter-out {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-3);
}
.conv-block {
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xs);
    overflow: hidden;
}
.conv-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--color-surface-muted);
    padding: 0.5rem 0.9rem;
    font-weight: var(--font-weight-heavy);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.conv-result {
    padding: var(--space-3);
    font-size: 1.8rem;
    font-weight: var(--font-weight-heavy);
    color: var(--color-text-primary);
    min-height: 64px;
    word-break: break-word;
}
.mini-btn {
    background: none;
    border: none;
    color: var(--color-accent);
    font-weight: var(--font-weight-heavy);
    font-size: 0.78rem;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.mini-btn:hover { color: var(--color-brand); }

/* ---------- Phrase flashcard ---------- */
.phrase-controls, .quiz-controls {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    align-items: center;
    margin-bottom: var(--space-3);
}
.tool-select {
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xs);
    padding: 0.6rem 0.9rem;
    font-family: var(--font-family-primary);
    font-weight: var(--font-weight-heavy);
    color: var(--color-text-primary);
    background: var(--color-surface-base);
    cursor: pointer;
}
.flashcard {
    perspective: 1200px;
    max-width: 460px;
    margin: 0 auto;
    cursor: pointer;
}
.flashcard-inner {
    position: relative;
    width: 100%;
    min-height: 220px;
    transform-style: preserve-3d;
    transition: transform 0.5s var(--easing);
}
.flashcard-inner.flipped { transform: rotateY(180deg); }
.flashcard-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: var(--space-4);
    border: 2px solid var(--color-border);
    border-bottom-width: 4px;
    border-radius: var(--radius-sm);
    background: var(--color-surface-base);
    text-align: center;
}
.flashcard-back { transform: rotateY(180deg); background: rgba(88,204,2,0.05); border-color: var(--color-brand); }
.fc-jp { font-size: 2.2rem; font-weight: var(--font-weight-heavy); color: var(--color-text-primary); }
.fc-reading { color: var(--color-text-secondary); font-weight: var(--font-weight-bold); }
.fc-hint { margin-top: 0.6rem; font-size: var(--font-size-xs); color: var(--color-text-muted, #999); text-transform: uppercase; letter-spacing: 0.5px; }
.fc-en { font-size: 1.5rem; font-weight: var(--font-weight-heavy); color: var(--color-brand); }
.fc-romaji { color: var(--color-text-secondary); font-weight: var(--font-weight-bold); }
.phrase-counter { text-align: center; margin-top: var(--space-2); font-weight: var(--font-weight-heavy); color: var(--color-text-secondary); }

/* ---------- Quiz ---------- */
.quiz-stage { text-align: center; margin-bottom: var(--space-3); }
.quiz-kana {
    font-size: 5rem;
    font-weight: var(--font-weight-heavy);
    color: var(--color-text-primary);
    line-height: 1.1;
}
.quiz-answer {
    width: 220px;
    max-width: 80%;
    text-align: center;
    font-size: 1.4rem;
    padding: 0.6rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xs);
    font-family: var(--font-family-primary);
    font-weight: var(--font-weight-heavy);
    margin-top: var(--space-2);
}
.quiz-feedback { min-height: 1.6em; margin-top: var(--space-2); font-weight: var(--font-weight-heavy); }
.quiz-feedback.good { color: var(--color-brand); }
.quiz-feedback.bad { color: #e53935; }
.quiz-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    margin-bottom: var(--space-3);
}
.qstat { text-align: center; }
.qstat-num { display: block; font-size: var(--font-size-xl); font-weight: var(--font-weight-heavy); color: var(--color-brand); line-height: 1; }
.qstat-label { font-size: var(--font-size-xs); font-weight: var(--font-weight-heavy); color: var(--color-text-secondary); text-transform: uppercase; letter-spacing: 0.5px; }

@media (max-width: 600px) {
    .quiz-kana { font-size: 3.6rem; }
    .conv-result { font-size: 1.5rem; }
    .quiz-stats { gap: var(--space-3); }
}

/* ============================================================
   Speaker / pronunciation buttons (site-wide)
   ============================================================ */
.speak-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    flex-shrink: 0;
    border: 2px solid var(--color-border);
    border-radius: 50%;
    background: var(--color-surface-base);
    color: var(--color-accent);
    cursor: pointer;
    font-size: 0.85rem;
    transition: var(--transition);
    padding: 0;
}
.speak-btn:hover {
    border-color: var(--color-accent);
    background: rgba(28, 176, 246, 0.1);
    transform: translateY(-1px);
}
.speak-btn:active { transform: translateY(0); }
.speak-btn.speaking {
    color: var(--color-text-inverse);
    background: var(--color-accent);
    border-color: var(--color-accent);
    animation: pulse-soft 0.6s var(--easing);
}
.speak-btn.speak-unsupported { opacity: 0.4; cursor: not-allowed; }
.speak-btn-lg { width: 48px; height: 48px; font-size: 1.1rem; }

/* Clickable kana cards/characters give a hint they're tappable */
.kana-card[data-speak], .character[data-speak] { cursor: pointer; }
.character[data-speak]:hover { color: var(--color-accent); }

/* Vocab card word + speaker on one row */
.vocab-word-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
}
.vocab-word-row .vocab-word { margin-bottom: 0; }

/* Converter / number result header actions */
.conv-head-actions { display: inline-flex; align-items: center; gap: 0.5rem; }
.conv-head-actions .speak-btn { width: 28px; height: 28px; font-size: 0.72rem; }

/* Quiz kana + speaker row, and the Check button row */
.quiz-kana-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
}
.quiz-btn-row { margin-top: var(--space-2); }

/* Phrase flashcard speaker spacing */
.flashcard-face .speak-btn-lg { margin-top: 0.4rem; }

/* Level buttons inline group (used inside .filter-bar with other controls) */
.level-buttons { display: inline-flex; flex-wrap: wrap; gap: var(--space-2); }

/* Homepage Irodori path card — distinct from JLPT cards */
.level-card.irodori {
    background: linear-gradient(135deg, rgba(28, 176, 246, 0.05), rgba(255,255,255,0));
}
.level-card.irodori h3 { color: var(--color-accent); }

/* Stacked filter bar: search on top, level buttons below */
.filter-bar-stack {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
}
.filter-bar-stack .search-input {
    width: 100%;
    max-width: none;
}
.filter-bar-stack .level-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

/* Vocabulary search romaji hint */
.search-hint {
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-bold);
    margin-left: 0.5rem;
    font-size: 0.95em;
}
.search-hint span[lang="ja"] {
    color: var(--color-brand);
    font-weight: var(--font-weight-heavy);
}


/* ================================================================
   NIHONGODOYA — JAPANESE THEME OVERRIDES
   All rules here cascade after the base styles above.
   ================================================================ */

/* ── New color tokens (override the Duolingo palette) ── */
:root {
    --color-brand:         #C0392B;   /* Torii vermillion — 弁柄 */
    --color-brand-hover:   #D4453B;
    --color-brand-shadow:  #922B21;
    --color-accent:        #2C5F8A;   /* Ai-iro indigo — 藍色 */
    --color-accent-shadow: #1E4066;
    --color-feather-green: #F4A7B3;   /* Sakura — 薄桜 */
    --color-danger:        #C0392B;
    --color-danger-shadow: #A93226;
    --color-gold:          #D4AC0D;   /* Yamabuki gold — 山吹色 */
    --color-sakura:        #F4A7B3;
    --color-sakura-deep:   #E8829A;
    --color-text-primary:  #1A1A2E;   /* Sumi ink — 墨 */
    --color-text-secondary:#6B5E52;   /* Warm brown */
    --color-surface-base:  #FDFAF6;   /* Washi paper — 和紙 */
    --color-surface-muted: #F4EDE3;   /* Warm cream */
    --color-border:        #E8DDD4;
    --color-border-strong: #C8BBAF;
    --color-focus-ring:    #2C5F8A;
    --primary-color:       var(--color-brand);
    --primary-dark:        var(--color-brand-shadow);
    --secondary-color:     var(--color-accent);
    --accent-color:        var(--color-sakura);
    --success-color:       var(--color-brand);
    --text-color:          var(--color-text-primary);
    --muted-color:         var(--color-text-secondary);
}

/* ── Base background ── */
body { background-color: var(--color-surface-base); }

/* ================================================================
   HERO — Night sky with falling sakura
   ================================================================ */
.hero {
    background: linear-gradient(160deg, #0D1B2A 0%, #1A0A2E 55%, #0A1E2E 100%);
    position: relative;
    overflow: hidden;
    min-height: 460px;
    display: flex;
    align-items: center;
    padding: 5rem 0;
}
.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 25% 80%, rgba(244,167,179,0.14) 0%, transparent 55%),
        radial-gradient(ellipse at 78% 25%, rgba(44,95,138,0.18)   0%, transparent 50%);
    z-index: 1;
    pointer-events: none;
}
.hero .container    { position: relative; z-index: 3; }
.hero-content       { position: relative; z-index: 3; }
.hero-title         { color: #ffffff; text-shadow: 0 2px 20px rgba(0,0,0,0.4); }
.hero-subtitle      { color: rgba(255,255,255,0.82); }

/* ── Sakura petals ── */
@keyframes sakura-fall {
    0%   { transform: translateY(-20px)  rotate(0deg)   translateX(0);                          opacity: 0.9; }
    50%  { transform: translateY(50vh)   rotate(200deg) translateX(var(--drift, 50px));          opacity: 0.6; }
    100% { transform: translateY(110vh)  rotate(420deg) translateX(calc(var(--drift, 50px) * 1.5)); opacity: 0; }
}

.sakura-container {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
    z-index: 2;
}

.petal {
    position: absolute;
    top: -15px;
    left: var(--left, 50%);
    width:  var(--size, 10px);
    height: calc(var(--size, 10px) * 0.85);
    background: radial-gradient(ellipse at 35% 35%, #ffe0ea, #FFB7C5 60%, #f48fa5);
    border-radius: 150% 0 150% 0;
    animation: sakura-fall var(--dur, 8s) ease-in-out var(--delay, 0s) infinite;
    transform-origin: center;
    box-shadow: inset 0 1px 2px rgba(255,255,255,0.3);
}

/* ── Torii silhouette ── */
.hero-torii {
    position: absolute;
    right: 3%;
    bottom: 0;
    opacity: 0.10;
    pointer-events: none;
    z-index: 2;
    filter: drop-shadow(0 0 30px rgba(192,57,43,0.3));
}

/* ================================================================
   PAGE HEADERS — dark Japanese ink gradient
   ================================================================ */
.page-header {
    background: linear-gradient(135deg, #0D1B2A 0%, #1A0A2E 100%);
    border-bottom: 3px solid #C0392B;
    position: relative;
    overflow: hidden;
}
.page-header::after {
    content: '桜';
    position: absolute;
    right: 8%;
    bottom: -0.6rem;
    font-size: 7rem;
    line-height: 1;
    color: rgba(255,183,197,0.07);
    pointer-events: none;
    font-weight: 900;
}
.page-header h1 { color: #ffffff; }
.page-header p  { color: rgba(255,255,255,0.72); }

/* ================================================================
   STATS ROW — dark with sakura numbers
   ================================================================ */
.stats-section {
    background: linear-gradient(135deg, #0D1B2A, #1A0A2E);
    border-top: none;
    border-bottom: none;
}
.stat-num   { color: #FFB7C5; }
.stat-label { color: rgba(255,255,255,0.6); }

/* ================================================================
   CTA SECTION — deep indigo
   ================================================================ */
.cta {
    background: linear-gradient(135deg, #1A0A2E 0%, #0D1B2A 100%);
    position: relative;
    overflow: hidden;
}
.cta::before {
    content: '鳥居';
    position: absolute;
    left: 5%;
    bottom: -1rem;
    font-size: 8rem;
    color: rgba(255,255,255,0.04);
    pointer-events: none;
    font-weight: 900;
}
.cta .btn-large {
    background: #ffffff;
    color: #C0392B;
    box-shadow: 0 4px 0 rgba(0,0,0,0.2);
}
.cta .btn-large:hover { background: #FFF0F2; }

/* ================================================================
   FOOTER — warm with sakura accent stripe
   ================================================================ */
.footer { position: relative; }
.footer::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, #922B21, #C0392B, #F4A7B3, #C0392B, #922B21);
}

/* ================================================================
   NAVIGATION
   ================================================================ */
.brand-link       { color: #C0392B; }
.brand-link:hover { color: #922B21; }
.nav-brand h1     { color: #C0392B; }
.nav-menu a.active {
    color: #C0392B;
    background-color: rgba(192,57,43,0.09);
}
.footer-section a:hover { color: #C0392B; }
.back-link:hover        { color: #C0392B; }

/* ================================================================
   CARDS & LEVEL CARDS
   ================================================================ */
.feature-card i           { color: #C0392B; }
.level-card.n5            { border-top-color: #C0392B; }
.level-card.n4            { border-top-color: #2C5F8A; }
.level-card.irodori {
    background: linear-gradient(135deg, rgba(244,167,179,0.08), transparent);
    border-top: 6px solid #E8829A;
}
.level-card.irodori h3    { color: #E8829A; }
.level-card ul li::before { color: #C0392B; }

/* ── Lesson / vocab / track number badges ── */
.lesson-badge     { background: #C0392B; box-shadow: 0 2px 0 #922B21; }
.vocab-lesson-num { background: #C0392B; box-shadow: 0 3px 0 #922B21; }
.track-num        { background: #C0392B; box-shadow: 0 2px 0 #922B21; }
.how-num          { background: #C0392B; box-shadow: 0 3px 0 #922B21; }

/* ================================================================
   VOCABULARY
   ================================================================ */
.vocab-reading                        { color: #2C5F8A; }
.vocab-source                         { color: #2C5F8A; }
.lesson-body p i                      { color: #C0392B; }
.vocab-lesson-card:hover .lesson-arrow{ color: #C0392B; }
.breadcrumb a                         { color: #C0392B; }
.search-hint span[lang="ja"]          { color: #C0392B; }

/* ================================================================
   FILTERS & TABS
   ================================================================ */
.filter-btn.active {
    background: rgba(192,57,43,0.09);
    color:  #C0392B;
    border-color: #C0392B;
}
.tab-btn.active { color: #C0392B; border-bottom-color: #C0392B; }
.tool-tab.active { background: #C0392B; border-color: #922B21; }

/* ================================================================
   FORMS & INPUTS
   ================================================================ */
.search-input:focus { border-color: #C0392B; }
.tool-textarea:focus, .quiz-answer:focus, .tool-select:focus { border-color: #C0392B; }
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
    border-color: #2C5F8A;
    box-shadow: 0 0 0 3px rgba(44,95,138,0.2);
}

/* ================================================================
   INTERACTIVE ELEMENTS
   ================================================================ */

/* Kana cards */
.kana-card:hover {
    border-color: #C0392B;
    background: rgba(192,57,43,0.04);
}
.kana-card:hover .kana-char { color: #C0392B; }

/* Quick-char buttons */
.quick-char:hover { border-color: #C0392B; background: rgba(192,57,43,0.05); }

/* Speak buttons */
.speak-btn        { color: #2C5F8A; }
.speak-btn:hover  { border-color: #2C5F8A; background: rgba(44,95,138,0.1); }
.speak-btn.speaking { background: #2C5F8A; border-color: #2C5F8A; }

/* Mini copy button */
.mini-btn       { color: #2C5F8A; }
.mini-btn:hover { color: #C0392B; }

/* FAQ */
.faq-item[open]                { border-color: #C0392B; }
.faq-item[open] summary::after { color: #C0392B; }

/* Flashcard */
.flashcard-back { background: rgba(192,57,43,0.04); border-color: #C0392B; }
.fc-en          { color: #C0392B; }

/* Quiz */
.quiz-option.correct { background: #2C5F8A; border-color: #2C5F8A; }
.quiz-feedback.good  { color: #2C5F8A; }
.quiz-score          { color: #C0392B; }
.qstat-num           { color: #C0392B; }

/* How-section links */
.how-link       { color: #2C5F8A; }
.how-link:hover { color: #C0392B; }

/* Resource badge */
.resource-card .badge:not(.badge-muted) {
    background: rgba(192,57,43,0.08);
    color: #C0392B;
}

/* Category section heading accent */
.category-section h2 { border-bottom-color: #C0392B; }

/* Close button */
.close:hover       { color: #C0392B; }
.lightbox-close:hover { color: #FFB7C5; }

/* Category tag — verb (was green, now vermillion) */
.cat-verb { background: #C0392B; }

/* ================================================================
   SUBTLE JAPANESE TEXTURE — seigaiha hint on muted sections
   ================================================================ */
.features::before, .how-section::before, .faq-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 50% 0%, rgba(192,57,43,0.03) 0, transparent 60%);
    pointer-events: none;
}
.features, .how-section, .faq-section { position: relative; }


/* ================================================================
   JAPANESE THEME v2 — Light & Bright (overrides dark palette)
   ================================================================ */

/* ── HERO: airy sakura-pink gradient ── */
.hero {
    background: linear-gradient(150deg, #fff5f8 0%, #fffaf0 45%, #f5f2ff 100%);
    min-height: 480px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    padding: 4rem 0;
}
.hero::before {
    /* Subtle seigaiha hint */
    background: none;
}
.hero .container  { position: relative; z-index: 3; }
.hero-content     { position: relative; z-index: 3; }
.hero-title       { color: #1A1A2E; text-shadow: none; }
.hero-subtitle    { color: #6B5E52; }

/* Deeper pink petals — visible on light bg */
.petal {
    background: radial-gradient(ellipse at 35% 35%, #ffb0ca, #FF6B9D 60%, #e0507a);
    opacity: 0.7;
}

/* ── Sticker patches layout ── */
.jp-patches {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
    z-index: 2;
}

@keyframes jp-float {
    0%, 100% { transform: translateY(0px)   rotate(var(--rot, 0deg)); }
    50%       { transform: translateY(-12px) rotate(var(--rot, 0deg)); }
}

.jp-sticker {
    position: absolute;
    filter: drop-shadow(2px 4px 12px rgba(0,0,0,0.12));
    animation: jp-float var(--dur, 5s) ease-in-out var(--delay, 0s) infinite;
}

/* Position each sticker */
.jp-sticker--tl   { top: 6%;    left: 1%;   --rot: -12deg; --dur: 5s;   --delay: 0s; }
.jp-sticker--tr2  { top: 4%;    right: 8%;  --rot:  10deg; --dur: 6s;   --delay: 2s; }
.jp-sticker--tr   { top: 3%;    right: 0%;  --rot:   6deg; --dur: 7s;   --delay: 1s; }
.jp-sticker--dora { top: 2%;    right: 16%; --rot:  -6deg; --dur: 5.5s; --delay: 3s; }
.jp-sticker--cat  { bottom: 4%; left: 1%;   --rot:  10deg; --dur: 6.5s; --delay: 1.5s; }
.jp-sticker--sushi{ bottom: 3%; right: 1%;  --rot:  -8deg; --dur: 5.8s; --delay: 0.8s; }
.jp-sticker--chop { top: 40%;   left: 2%;   --rot: -15deg; --dur: 7s;   --delay: 2.5s; }

/* Hide edge stickers on small screens to keep text readable */
@media (max-width: 900px) {
    .jp-sticker--tr, .jp-sticker--chop { display: none; }
}
@media (max-width: 640px) {
    .jp-sticker--tl, .jp-sticker--tr2, .jp-sticker--dora,
    .jp-sticker--cat, .jp-sticker--sushi { opacity: 0.35; }
}

/* ── PAGE HEADERS: warm sakura tint ── */
.page-header {
    background: linear-gradient(135deg, #fff0f6 0%, #fff5ee 100%);
    border-bottom: 3px solid #C0392B;
    position: relative;
    overflow: hidden;
}
.page-header::after {
    content: '桜';
    color: rgba(192,57,43,0.07);
}
.page-header h1 { color: #1A1A2E; }
.page-header p  { color: #6B5E52; }

/* ── STATS SECTION: warm cream with red numbers ── */
.stats-section {
    background: linear-gradient(135deg, #fff5f8, #fffaf0);
    border-top: 1px solid #E8DDD4;
    border-bottom: 1px solid #E8DDD4;
}
.stat-num   { color: #C0392B; }
.stat-label { color: #6B5E52; }

/* ── CTA: rich vermillion ── */
.cta {
    background: linear-gradient(135deg, #C0392B 0%, #8B2220 100%);
    position: relative;
    overflow: hidden;
}
.cta::before {
    content: '桜';
    position: absolute;
    right: 5%;
    bottom: -1rem;
    font-size: 10rem;
    color: rgba(255,255,255,0.06);
    pointer-events: none;
    font-weight: 900;
}
.cta h2, .cta p { color: #ffffff; }
.cta .btn-large {
    background: #ffffff;
    color: #C0392B;
    box-shadow: 0 4px 0 rgba(0,0,0,0.2);
}
.cta .btn-large:hover { background: #FFF0F2; }


/* ================================================================
   RESOURCE CARDS — Enhanced (with description + badges row)
   ================================================================ */
.resource-card {
    gap: var(--space-2);
}
.resource-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 2px;
}
.resource-desc {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
    margin: 0;
    flex-grow: 1;
}

/* ================================================================
   LISTENING BANNER (top of page)
   ================================================================ */
.listening-banner {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
    padding: var(--space-3) var(--space-4);
    background: linear-gradient(135deg, rgba(192,57,43,0.06), rgba(244,167,179,0.08));
    border-left: 4px solid #C0392B;
    border-radius: 12px;
}
.listening-banner i {
    font-size: 1.8rem;
    color: #C0392B;
    flex-shrink: 0;
}
.listening-banner strong {
    color: var(--color-text-primary);
    font-weight: 800;
    font-size: 1.05rem;
    display: block;
    margin-bottom: 2px;
}
.listening-banner p {
    margin: 0;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}
@media (max-width: 600px) {
    .listening-banner { flex-direction: column; text-align: center; }
}