/* ============================================
    中文大师 — Midnight Ocean Theme
    Coral · Lavender · Teal · Deep Navy
    ============================================ */

/* === CSS Variables (match themes.css) === */
:root {
    --primary:       #ff6b6b;
    --primary-dark:  #ef4444;
    --primary-light: #fca5a5;
    --secondary:     #a78bfa;
    --accent:        #06b6d4;
    --success:       #10b981;
    --warning:       #f59e0b;
    --danger:        #f43f5e;
    --bg-dark:       #0f172a;
    --bg-card:       #1e293b;
    --bg-hover:      #334155;
    --bg-input:      #0f172a;
    --text-primary:   #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted:     #64748b;
    --border:         rgba(148, 163, 184, 0.1);
    --gradient-primary: linear-gradient(135deg, #ff6b6b 0%, #ef4444 100%);
    --gradient-dark:    linear-gradient(180deg, #0f172a 0%, #1e293b 40%, #334155 100%);
    --gradient-card:    linear-gradient(180deg, #1e293b 0%, #263548 100%);
    --font-cn: 'Noto Sans SC', 'Microsoft YaHei', 'PingFang SC', 'SimHei', sans-serif;
    --font-en: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    --spacing-xs: 4px;  --spacing-sm: 8px;  --spacing-md: 16px;
    --spacing-lg: 24px; --spacing-xl: 32px; --spacing-2xl: 48px; --spacing-3xl: 64px;
    --radius-sm: 4px;  --radius-md: 8px;  --radius-lg: 12px;
    --radius-xl: 16px; --radius-full: 9999px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: var(--font-en);
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.7;
    min-height: 100vh; min-height: 100dvh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* === MIDNIGHT OCEAN GRID PATTERN — subtle slate lines === */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    opacity: 0.06;
    background-image:
        linear-gradient(rgba(148, 163, 184, 0.5) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148, 163, 184, 0.5) 1px, transparent 1px);
    background-size: 60px 60px;
    background-position: center center;
}

/* Global focus-visible */
:focus-visible {
    outline: 2px solid var(--color-secondary);
    outline-offset: 3px;
    border-radius: 2px;
}
a:focus-visible, button:focus-visible, [tabindex]:focus-visible {
    outline: 2px solid var(--color-secondary);
    outline-offset: 3px;
}

/* Skip to content */
.skip-to-content {
    position: fixed;
    top: -100%;
    left: var(--spacing-md);
    z-index: 100000;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--gradient-primary);
    color: white;
    font-weight: 600;
    font-size: 14px;
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: top 0.3s ease;
}
.skip-to-content:focus { top: var(--spacing-md); }

/* Hardware acceleration — only on currently-animating / tilted elements */
.tilt-active,
.ambient-orb,
.ink-particle {
    will-change: transform, opacity;
}
/* content-visibility is defined in responsive.css with contain-intrinsic-size */

/* === OCEAN WASH TEXTURE OVERLAY === */
.ink-texture {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    pointer-events: none; z-index: 0;
    opacity: 0.03;
    background-image:
        radial-gradient(ellipse at 20% 50%, #a78bfa 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, #06b6d4 0%, transparent 40%),
        radial-gradient(ellipse at 50% 80%, #ff6b6b 0%, transparent 45%);
}

/* === SLATE DIVIDER === */
.ink-brush-divider {
    width: 100%; height: 2px;
    background: linear-gradient(90deg, transparent, rgba(255, 107, 107, 0.2), rgba(255, 107, 107, 0.06), transparent);
    margin: var(--spacing-lg) 0;
    position: relative;
}

/* === LOADING SCREEN === */
.loading-screen {
    background: var(--gradient-dark);
    position: fixed; top: 0; left: 0;
    width: 100%; height: 100%;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    z-index: 99999;
    transform-origin: center center;
}
.loading-screen.fade-out { opacity: 0; visibility: hidden; }
.loading-logo {
    display: flex; align-items: center; justify-content: center;
    gap: 8px; margin-bottom: 40px;
}
.loading-logo .chinese-char {
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 64px; font-weight: 700;
    display: inline-block;
    animation: loadCharFloat 2s ease-in-out infinite;
    background: linear-gradient(180deg, #f8fafc 0%, #ff6b6b 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 0 24px rgba(255, 107, 107, 0.3));
}
.loading-logo .chinese-char:nth-child(2) { animation-delay: 0.2s; }
.loading-logo .chinese-char:nth-child(3) { animation-delay: 0.4s; }
.loading-logo .chinese-char:nth-child(4) { animation-delay: 0.6s; }

@keyframes loadCharFloat {
    0%, 100% { transform: translateY(0) scale(1); }
    30%  { transform: translateY(-16px) scale(1.06); }
    60%  { transform: translateY(0) scale(1); }
}

/* === APP LAYOUT === */
#app { display: flex; min-height: 100vh; min-height: 100dvh; position: relative; z-index: 1; }

/* === NAVIGATION === */
.main-nav {
    width: 260px; min-width: 260px;
    background: var(--bg-card);
    border-right: 1px solid rgba(148, 163, 184, 0.08);
    display: flex; flex-direction: column;
    position: fixed; top: 0; left: 0; bottom: 0;
    z-index: 100;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    overflow-y: auto;
}
.main-nav.hidden { transform: translateX(-100%); visibility: hidden; }
.nav-header {
    padding: 20px 18px 14px;
    display: flex;
    flex-direction: column;
    align-items: center;
    border-bottom: 1px solid rgba(148, 163, 184, 0.08);
    position: relative;
}
.nav-logo {
    display: flex; align-items: center; gap: var(--spacing-sm);
    margin-bottom: 12px;
}
.logo-icon {
    width: 38px; height: 38px;
    display: flex; align-items: center; justify-content: center;
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 20px; font-weight: 900;
    color: #ff6b6b;
    border: 2px solid rgba(255, 107, 107, 0.3);
    border-radius: var(--radius-md);
    background: rgba(255, 107, 107, 0.08);
}
.logo-text-group { display: flex; flex-direction: column; }
.logo-text-cn {
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 17px; font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}
.logo-text-en {
    font-size: 10px; font-weight: 500;
    color: var(--text-muted);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

/* Pinyin toggle controls in nav */
.nav-toggle-controls {
    display: flex;
    gap: 6px;
    justify-content: center;
    width: 100%;
}
.nav-toggle-controls .toggle-btn {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 6px 14px;
    border-radius: var(--radius-full);
    background: rgba(148, 163, 184, 0.06);
    border: 1px solid rgba(148, 163, 184, 0.15);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.25s ease;
    font-size: 12px;
    font-weight: 500;
    font-family: inherit;
}
.nav-toggle-controls .toggle-btn:hover {
    background: rgba(148, 163, 184, 0.12);
    color: var(--text-primary);
    border-color: rgba(148, 163, 184, 0.25);
}
.nav-toggle-controls .toggle-btn.active {
    background: rgba(255, 107, 107, 0.15);
    color: #fca5a5;
    border-color: rgba(255, 107, 107, 0.35);
}
.nav-toggle-controls .toggle-btn .toggle-icon { font-weight: 700; font-size: 13px; }
.nav-toggle-controls .toggle-btn .toggle-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Nav Sections */
.nav-section-label {
    padding: var(--spacing-lg) var(--spacing-lg) var(--spacing-xs);
    font-size: 10px; font-weight: 600;
    text-transform: uppercase; letter-spacing: 0.12em;
    color: var(--text-muted);
}
.nav-links { padding: var(--spacing-xs); }
.nav-link {
    display: flex; align-items: center; gap: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    margin: 2px 4px;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-size: 14px; font-weight: 500;
    transition: all 0.2s ease;
    position: relative;
    cursor: pointer;
    color: var(--text-secondary);
}
.nav-link:hover { color: var(--text-primary); background: rgba(148, 163, 184, 0.06); }
.nav-link.active {
    color: #fca5a5;
    background: rgba(255, 107, 107, 0.1);
}
.nav-link.active::before {
    content: '';
    position: absolute; left: 0; top: 50%;
    transform: translateY(-50%);
    width: 3px; height: 20px;
    background: #ff6b6b;
    border-radius: 0 2px 2px 0;
}
.nav-icon { display: flex; align-items: center; opacity: 0.7; }
.nav-link.active .nav-icon { opacity: 1; }
.nav-text { font-size: 14px; }

/* Nav Footer */
.nav-footer {
    margin-top: auto;
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid rgba(148, 163, 184, 0.06);
}
.nav-footer-top { margin-bottom: var(--spacing-md); }
.user-info {
    display: flex; align-items: center; gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}
.user-info:hover { background: rgba(148, 163, 184, 0.05); }
.user-avatar {
    width: 32px; height: 32px;
    border-radius: var(--radius-md);
    background: var(--gradient-primary);
    color: white;
    display: flex; align-items: center; justify-content: center;
    font-weight: 600; font-size: 14px;
}
.user-name-label { font-size: 14px; color: var(--text-secondary); }
.user-level { margin-bottom: var(--spacing-sm); }
.level-row {
    display: flex; justify-content: space-between;
    align-items: center; margin-bottom: 6px;
}
.level-badge { font-size: 12px; font-weight: 600; }
.xp-text { font-size: 11px; color: var(--text-muted); }
.xp-bar {
    height: 4px; border-radius: 2px;
    background: rgba(148, 163, 184, 0.08); overflow: hidden;
}
.xp-fill {
    height: 100%; border-radius: 2px;
    background: var(--gradient-secondary);
    transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}
.streak-display {
    display: flex; align-items: center; gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    font-size: 13px;
}
.streak-icon { font-size: 16px; }
.streak-count { font-weight: 700; }
.streak-label { font-size: 12px; color: var(--text-muted); }

/* === MAIN CONTENT === */
.main-content {
    flex: 1; margin-left: 240px;
    padding: var(--spacing-xl);
    min-height: 100vh; min-height: 100dvh;
    position: relative; z-index: 1;
    max-width: calc(100% - 240px);
}

/* === MODULE VISIBILITY === */
.module { display: none !important; visibility: hidden; }
.module.active { display: block !important; visibility: visible; }
/* === BRUSH-DECORATED SECTION HEADERS === */
.section-header-brush {
    position: relative;
    display: inline-block;
    padding-bottom: var(--spacing-sm);
}
.section-header-brush::after {
    content: '';
    position: absolute; bottom: 0; left: 0;
    width: 100%; height: 2px;
    background: linear-gradient(90deg, rgba(255, 107, 107, 0.3), transparent);
}

/* === STATS GRID === */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
}
.stats-card {
    background: var(--bg-card);
    border: 1px solid rgba(148, 163, 184, 0.06);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1),
                border-color 0.3s ease,
                box-shadow 0.3s ease;
    cursor: default;
    position: relative;
    overflow: hidden;
    contain: layout style;
}
.stats-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(255, 107, 107, 0.3), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
}
.stats-card:hover::before { opacity: 1; }
.stats-card:hover:not(.tilt-active) {
    transform: translateY(-4px);
    border-color: rgba(148, 163, 184, 0.14);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}
.stats-icon { font-size: 28px; margin-bottom: var(--spacing-sm); }
.stats-value {
    font-size: 32px; font-weight: 700;
    margin-bottom: var(--spacing-xs);
    /* Transition set in animations.css */
}
.stats-card:hover .stats-value { transform: scale(1.08); }
.stats-label { font-size: 13px; color: var(--text-secondary); }

/* === DASHBOARD INSIGHT ROW === */
.dashboard-insight-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}
.card-lift {
    background: var(--bg-card);
    border: 1px solid rgba(148, 163, 184, 0.06);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    /* Transitions set in animations.css (loads after) */
}
.card-lift:hover:not(.tilt-active) {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
    border-color: rgba(148, 163, 184, 0.12);
}

/* Daily Goal */
.daily-goal-section {
    display: flex; flex-direction: column; align-items: center;
    margin-bottom: var(--spacing-lg);
}
.daily-goal-section h2,
.daily-goal-section h3 {
    font-size: 18px; font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    text-align: center;
}
.quick-actions h2,
.smart-review-section h2,
.smart-review-section h3,
.recent-activity h2,
.recent-activity h3,
.analytics-dashboard h2,
.skills-overview h3 {
    font-size: 18px; font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}
.section-desc {
    font-size: 13px; color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}
.goal-progress { display: flex; align-items: center; gap: var(--spacing-xl); justify-content: center; }
.goal-ring { position: relative; width: 100px; height: 100px; flex-shrink: 0; }
.goal-ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.goal-ring .goal-bg {
    fill: none;
    stroke: rgba(148, 163, 184, 0.08);
    stroke-width: 6;
}
.goal-ring .goal-fill {
    fill: none;
    stroke: url(#goal-gradient);
    stroke-width: 6;
    stroke-linecap: round;
    transition: stroke-dashoffset 0.8s ease;
}
.goal-text {
    position: absolute; inset: 0;
    display: flex; align-items: center; justify-content: center;
    font-size: 22px; font-weight: 700;
    line-height: 1;
}
.goal-percent-sign { font-size: 14px; color: var(--text-muted); }
.goal-details { display: flex; flex-direction: column; gap: var(--spacing-sm); }
.goal-item {
    display: flex; align-items: center; gap: var(--spacing-sm);
    background: rgba(148, 163, 184, 0.03);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 13px;
}
.goal-icon { font-size: 16px; }

/* Quick Actions */
.quick-actions { margin-bottom: var(--spacing-lg); text-align: center; }
.action-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
    justify-content: center;
}
.action-card {
    background: var(--bg-card);
    border: 1px solid rgba(148, 163, 184, 0.06);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    cursor: pointer;
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
.action-card:hover:not(.tilt-active) {
    transform: translateY(-3px);
    border-color: rgba(255, 107, 107, 0.25);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.25);
}
.action-icon { font-size: 24px; margin-bottom: var(--spacing-xs); }
.action-card h3 { font-size: 15px; font-weight: 600; margin-bottom: 2px; }
.action-card p { font-size: 12px; color: var(--text-secondary); }

/* Smart Review */
.smart-review-section {
    margin-bottom: var(--spacing-lg);
    text-align: center;
}
.review-actions { display: flex; flex-direction: column; gap: var(--spacing-sm); align-items: center; }
.review-stats { margin-top: var(--spacing-md); }

/* Recent Activity */
.recent-activity { margin-top: var(--spacing-2xl); text-align: center; }
.activity-list {
    background: var(--bg-card);
    border: 1px solid rgba(148, 163, 184, 0.06);
    border-radius: var(--radius-lg);
    overflow: hidden;
}
.activity-empty {
    padding: var(--spacing-2xl);
    text-align: center;
    color: var(--text-secondary);
}
.activity-empty-icon { font-size: 40px; margin-bottom: var(--spacing-md); }
.activity-item {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid rgba(148, 163, 184, 0.04);
    display: flex; align-items: center; gap: var(--spacing-md);
    font-size: 14px;
    transition: background 0.2s ease;
}
.activity-item:last-child { border-bottom: none; }
.activity-item:hover { background: rgba(148, 163, 184, 0.03); }
.activity-icon { font-size: 18px; }
.activity-time { font-size: 12px; color: var(--text-muted); margin-left: auto; }

/* === DASHBOARD SECTION HEADERS === */
.dashboard-section-header {
    text-align: center;
    margin-bottom: var(--spacing-md);
}
.dashboard-section-header h2 {
    font-size: 18px; font-weight: 600;
    color: var(--text-primary);
    display: inline-block;
    position: relative;
}

/* === HERO BANNER === */
.dashboard-hero {
    background: linear-gradient(135deg, rgba(255, 107, 107, 0.06) 0%, rgba(167, 139, 250, 0.04) 50%, rgba(6, 182, 212, 0.03) 100%);
    border: 1px solid rgba(148, 163, 184, 0.07);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl) var(--spacing-2xl);
    margin-bottom: 0;
    text-align: left;
    position: relative;
    overflow: hidden;
}
.dashboard-hero::after {
    content: '';
    position: absolute;
    top: -40px; right: -20px;
    width: 160px; height: 160px;
    background: radial-gradient(circle, rgba(255, 107, 107, 0.08) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}
.hero-top-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}
.hero-greeting { flex: 1; }
.hero-greeting .greeting-row { justify-content: flex-start; margin-bottom: 2px; }
.hero-greeting .greeting { font-size: 28px; }
.hero-greeting .greeting-subtitle { text-align: left; font-size: 14px; }
.hero-metrics {
    display: flex;
    gap: var(--spacing-lg);
    flex-shrink: 0;
}
.hero-metric {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: rgba(148, 163, 184, 0.04);
    border: 1px solid rgba(148, 163, 184, 0.06);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    min-width: 80px;
}
.hero-metric-icon { font-size: 18px; margin-bottom: 2px; }
.hero-metric-value { font-size: 20px; font-weight: 700; color: var(--text-primary); }
.hero-metric-label { font-size: 10px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.04em; }
.hero-level-bar {
    background: rgba(148, 163, 184, 0.04);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
}
.hero-level-info {
    display: flex; align-items: center; gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}
.hero-level-badge {
    font-size: 12px; font-weight: 700; color: var(--color-primary);
    background: rgba(255, 107, 107, 0.12);
    padding: 2px 10px; border-radius: var(--radius-full);
}
.hero-level-title {
    font-size: 13px; font-weight: 500; color: var(--text-secondary);
}
.hero-xp-bar { margin-bottom: 4px; }
.hero-xp-text { font-size: 11px; color: var(--text-muted); }

/* === DASHBOARD SNAPSHOT (stats + goal side-by-side) === */
.dashboard-snapshot {
    display: grid;
    grid-template-columns: 1.6fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    align-items: start;
}
.dashboard-snapshot .dashboard-grid {
    margin-bottom: 0;
    grid-template-columns: repeat(2, 1fr);
}

/* Stats trend indicator */
.stats-trend {
    display: inline-block;
    font-size: 11px; font-weight: 600;
    margin-top: 2px;
    padding: 1px 6px;
    border-radius: var(--radius-full);
}
.stats-trend.up { color: #10b981; background: rgba(16, 185, 129, 0.12); }
.stats-trend.down { color: #ff6b6b; background: rgba(255, 107, 107, 0.12); }
.stats-trend.neutral { color: var(--text-muted); background: rgba(148, 163, 184, 0.08); }

/* Snapshot daily goal - compact */
.dashboard-snapshot .daily-goal-section {
    margin-bottom: 0;
    padding: var(--spacing-lg);
}
.dashboard-snapshot .daily-goal-section h3 {
    font-size: 15px; font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}
.dashboard-snapshot .goal-progress { gap: var(--spacing-lg); }
.dashboard-snapshot .goal-ring { width: 80px; height: 80px; }
.dashboard-snapshot .goal-text { font-size: 18px; }

/* === WEEKLY CHART === */
.weekly-chart-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-lg) var(--spacing-xl);
}
.weekly-chart {
    flex: 1;
    display: flex;
    align-items: flex-end;
    justify-content: space-around;
    height: 140px;
    gap: 6px;
    padding: 0 4px;
}
.weekly-bar-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
    min-width: 0;
}
.weekly-bar {
    width: 100%;
    max-width: 48px;
    border-radius: 6px 6px 2px 2px;
    transition: height 0.6s cubic-bezier(0.34, 1.56, 0.64, 1), filter 0.2s ease;
    min-height: 4px;
    position: relative;
    transform-origin: bottom;
    animation: weeklyBarGrow 0.7s cubic-bezier(0.34, 1.56, 0.64, 1) backwards;
}
@keyframes weeklyBarGrow {
    0%   { transform: scaleY(0); opacity: 0; }
    60%  { opacity: 1; }
    100% { transform: scaleY(1); opacity: 1; }
}
.weekly-bar-wrap:nth-child(1) .weekly-bar { animation-delay: 0.05s; }
.weekly-bar-wrap:nth-child(2) .weekly-bar { animation-delay: 0.12s; }
.weekly-bar-wrap:nth-child(3) .weekly-bar { animation-delay: 0.19s; }
.weekly-bar-wrap:nth-child(4) .weekly-bar { animation-delay: 0.26s; }
.weekly-bar-wrap:nth-child(5) .weekly-bar { animation-delay: 0.33s; }
.weekly-bar-wrap:nth-child(6) .weekly-bar { animation-delay: 0.40s; }
.weekly-bar-wrap:nth-child(7) .weekly-bar { animation-delay: 0.47s; }
.weekly-bar:hover { filter: brightness(1.15); }
.weekly-bar.active { background: linear-gradient(180deg, #ff6b6b, #ef4444); }
.weekly-bar.active::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    box-shadow: 0 0 0 0 rgba(255, 107, 107, 0.5);
    animation: todayPulse 2.4s ease-in-out infinite;
    pointer-events: none;
}
@keyframes todayPulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(255, 107, 107, 0.45); }
    50%      { box-shadow: 0 0 14px 4px rgba(255, 107, 107, 0.18); }
}
.weekly-bar.inactive { background: rgba(148, 163, 184, 0.12); }
.weekly-bar.has-activity { background: linear-gradient(180deg, rgba(167, 139, 250, 0.7), rgba(167, 139, 250, 0.4)); }
.weekly-bar-label {
    font-size: 10px;
    color: var(--text-muted);
    margin-top: 6px;
    text-align: center;
    white-space: nowrap;
}
.weekly-bar-value {
    font-size: 10px;
    color: var(--text-secondary);
    margin-bottom: 4px;
    text-align: center;
}
.weekly-summary {
    flex-shrink: 0;
    min-width: 120px;
    text-align: center;
}
.weekly-summary-num {
    font-size: 28px; font-weight: 700;
    color: var(--text-primary);
}
.weekly-summary-label {
    font-size: 12px; color: var(--text-muted);
    margin-top: 2px;
}
.weekly-summary-avg {
    font-size: 13px; color: var(--text-secondary);
    margin-top: var(--spacing-sm);
}

/* === SKILLS OVERVIEW === */
.skills-overview h3 {
    font-size: 15px; font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}
.skills-overview .category-row {
    margin-bottom: var(--spacing-sm);
}
.skills-overview .category-row-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 2px;
}
.skills-overview .category-name {
    font-size: 13px;
    color: var(--text-secondary);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.skills-overview .category-icon {
    font-size: 13px;
    line-height: 1;
}
.skills-overview .category-accuracy {
    font-size: 14px; font-weight: 700;
}
.skills-overview .category-bar {
    height: 6px;
    background: rgba(148, 163, 184, 0.08);
    border-radius: 3px;
    margin: 4px 0 2px;
    overflow: hidden;
}
.skills-overview .category-fill {
    height: 100%;
    border-radius: 3px;
}
.skills-overview .category-stats {
    font-size: 11px;
    color: var(--text-muted);
}
.skills-grid { display: flex; flex-direction: column; gap: var(--spacing-sm); margin-bottom: var(--spacing-md); }
.skills-empty {
    text-align: center;
    padding: var(--spacing-lg) var(--spacing-md);
    color: var(--text-muted);
    font-size: 13px;
}
.skills-empty-icon { font-size: 28px; margin-bottom: var(--spacing-sm); opacity: 0.7; }
.skills-empty p { margin: 0; }

.skills-stat-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}
.skills-stat-pill {
    background: rgba(148, 163, 184, 0.04);
    border: 1px solid rgba(148, 163, 184, 0.06);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm);
    text-align: center;
}
.skills-stat-pill .pill-value {
    font-size: 16px; font-weight: 700;
    color: var(--text-primary);
}
.skills-stat-pill .pill-label {
    font-size: 10px; color: var(--text-muted);
    margin-top: 2px;
}

/* === PROVERB CARD === */
.proverb-section {
    margin-bottom: var(--spacing-lg);
}
.proverb-card {
    background: linear-gradient(135deg, rgba(167, 139, 250, 0.06), rgba(255, 107, 107, 0.04));
    border: 1px solid rgba(167, 139, 250, 0.12);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg) var(--spacing-xl);
    text-align: center;
    position: relative;
    overflow: hidden;
}
.proverb-card::before {
    content: '\201C';
    font-size: 80px;
    line-height: 1;
    position: absolute;
    top: 6px; left: 18px;
    opacity: 0.10;
    color: var(--color-secondary);
    pointer-events: none;
    font-family: 'Noto Serif SC', Georgia, serif;
    font-weight: 700;
}
.proverb-card::after {
    content: '\201D';
    font-size: 80px;
    line-height: 1;
    position: absolute;
    bottom: 6px; right: 18px;
    opacity: 0.10;
    color: var(--color-secondary);
    pointer-events: none;
    font-family: 'Noto Serif SC', Georgia, serif;
    font-weight: 700;
}
.proverb-attribution {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: var(--spacing-md);
    letter-spacing: 0.04em;
    font-style: italic;
}
.proverb-chinese {
    font-size: 22px; font-weight: 700;
    font-family: 'Noto Sans SC', serif;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
}
.proverb-pinyin {
    font-size: 13px;
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: var(--spacing-sm);
}
.proverb-meaning {
    font-size: 13px;
    color: var(--text-muted);
    max-width: 500px;
    margin: 0 auto;
}

/* === MODULE HEADERS === */
.module-header {
    margin-bottom: var(--spacing-2xl);
    text-align: center;
}
.module-header h1 {
    font-size: 32px; font-weight: 700;
    margin-bottom: var(--spacing-xs);
}
.module-subtitle {
    font-size: 15px;
    color: var(--text-secondary);
}

/* === EXERCISE TYPE CARDS === */
.listening-menu, .reading-menu, .speaking-menu {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: var(--spacing-md);
    margin: 0 auto;
    justify-items: center;
}
.exercise-type-card, .vocab-mode-card, .game-card {
    background: var(--bg-card);
    border: 1px solid rgba(148, 163, 184, 0.06);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    cursor: pointer;
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
}
.exercise-type-card:hover:not(.tilt-active), .vocab-mode-card:hover:not(.tilt-active), .game-card:hover:not(.tilt-active) {
    transform: translateY(-4px);
    border-color: rgba(255, 107, 107, 0.2);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}
.exercise-type-card::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(255, 107, 107, 0.25), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
}
.exercise-type-card:hover::before { opacity: 1; }
.type-icon, .mode-icon {
    font-size: 32px; margin-bottom: var(--spacing-md);
}
.exercise-type-card h3, .vocab-mode-card h3, .game-card h3 {
    font-size: 17px; font-weight: 600;
    margin-bottom: var(--spacing-xs);
}
.exercise-type-card p, .vocab-mode-card p, .game-card p {
    font-size: 13px; color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}
.type-difficulty {
    font-size: 11px;
    padding: 3px 12px;
    border-radius: var(--radius-full);
    display: inline-block;
    font-weight: 500;
    letter-spacing: 0.03em;
}
.type-difficulty.easy {
    background: rgba(74, 140, 111, 0.12);
    color: var(--color-accent);
}
.type-difficulty.medium {
    background: rgba(196, 179, 138, 0.12);
    color: var(--color-warning);
}
.type-difficulty.hard {
    background: rgba(255, 107, 107, 0.12);
    color: var(--color-danger);
}

/* === EXERCISE CONTAINER === */
.exercise-container { display: none; }
.exercise-container:not(.hidden) { display: block; }
.exercise-container.hidden { display: none; }
.exercise-header {
    display: flex; align-items: center; gap: var(--spacing-md);
    padding-bottom: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    border-bottom: 1px solid rgba(148, 163, 184, 0.06);
}
.back-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: none; border: 1px solid rgba(148, 163, 184, 0.1);
    border-radius: var(--radius-md);
    cursor: pointer; font-size: 14px;
    transition: all 0.2s ease;
    color: var(--text-secondary);
}
.back-btn:hover { background: rgba(148, 163, 184, 0.06); color: var(--text-primary); }
.exercise-title { font-size: 18px; font-weight: 600; flex: 1; }
.exercise-progress { font-size: 14px; color: var(--text-muted); }
.exercise-body { margin-bottom: var(--spacing-xl); }
.exercise-controls {
    display: flex; gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

/* === BUTTONS === */
.btn {
    padding: 10px 24px;
    border: none; border-radius: var(--radius-md);
    font-size: 14px; font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    letter-spacing: 0.02em;
    position: relative;
    overflow: hidden;
}
.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 2px 12px rgba(255, 107, 107, 0.25);
}
.btn-primary:hover {
    box-shadow: 0 4px 20px rgba(255, 107, 107, 0.35);
    transform: translateY(-1px);
}
.btn-primary:active { transform: scale(0.97); }
.btn-secondary {
    background: rgba(148, 163, 184, 0.06);
    color: var(--text-primary);
    border: 1px solid rgba(148, 163, 184, 0.1);
}
.btn-secondary:hover { background: rgba(148, 163, 184, 0.12); }
.btn-success { background: var(--gradient-success); color: white; }
.btn-danger { background: var(--color-danger); color: white; }
.btn-sm { padding: 6px 16px; font-size: 13px; }
.btn-lg { padding: 14px 32px; font-size: 16px; }

/* === INPUT FIELDS === */
.input-field {
    background: var(--bg-input);
    border: 2px solid rgba(148, 163, 184, 0.1);
    border-radius: var(--radius-md);
    padding: 10px 16px;
    font-size: 14px;
    font-family: var(--font-en);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    width: 100%;
    color: var(--text-primary);
}
.input-field:focus {
    outline: none;
    border-color: rgba(255, 107, 107, 0.4);
    box-shadow: 0 0 0 3px rgba(255, 107, 107, 0.2);
}
.input-field.correct {
    border-color: rgba(93, 148, 107, 0.5);
    box-shadow: 0 0 0 3px rgba(93, 148, 107, 0.08);
}
.input-field.incorrect {
    border-color: rgba(192, 90, 64, 0.5);
    box-shadow: 0 0 0 3px rgba(192, 90, 64, 0.08);
}

/* === FLASHCARDS === */
.flashcard {
    background: var(--bg-card);
    border: 1px solid rgba(148, 163, 184, 0.08);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    text-align: center;
    cursor: pointer;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.4s ease;
    min-height: 280px;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    transform-style: preserve-3d;
    position: relative;
}
.flashcard:hover:not(.tilt-active) {
    transform: translateY(-4px);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.35);
}
.flashcard.flipped { transform: rotateY(180deg); }
.flashcard-front, .flashcard-back {
    backface-visibility: hidden;
    position: absolute;
    inset: 0;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    padding: var(--spacing-xl);
}
.flashcard-back { transform: rotateY(180deg); }
.flashcard-character {
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 72px; font-weight: 700;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}
.flashcard-pinyin {
    font-size: 18px; color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}
.flashcard-meaning { font-size: 20px; font-weight: 500; }

/* === MATCHING CARDS === */
.matching-card {
    background: var(--bg-card);
    border: 1px solid rgba(148, 163, 184, 0.08);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    font-size: 14px;
}
.matching-card:hover:not(.tilt-active) {
    border-color: rgba(255, 107, 107, 0.25);
    transform: translateY(-2px);
}
.matching-card.selected {
    border-color: rgba(255, 107, 107, 0.5);
    background: rgba(255, 107, 107, 0.08);
}
.matching-card.flipped {
    background: var(--color-primary); color: white;
    border-color: var(--color-primary);
}
.matching-card.matched {
    background: var(--color-success); color: white;
    border-color: var(--color-success);
}

/* === LISTENING === */
.audio-btn {
    background: var(--bg-card);
    border: 1px solid rgba(148, 163, 184, 0.1);
    border-radius: var(--radius-full);
    width: 48px; height: 48px;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; font-size: 20px;
    transition: all 0.2s ease;
    color: var(--color-primary);
}
.audio-btn:hover {
    background: rgba(255, 107, 107, 0.1);
    transform: scale(1.05);
}
.listening-input {
    background: var(--bg-input);
    border: 2px solid rgba(148, 163, 184, 0.1);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    font-size: 16px; width: 100%;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    color: var(--text-primary);
}
.listening-input:focus {
    outline: none;
    border-color: rgba(255, 107, 107, 0.4);
    box-shadow: 0 0 0 3px rgba(255, 107, 107, 0.2);
}
.listening-option {
    background: var(--bg-card);
    border: 1px solid rgba(148, 163, 184, 0.08);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    cursor: pointer;
    display: flex; align-items: center; gap: var(--spacing-md);
    transition: all 0.2s ease;
    font-size: 14px;
    color: var(--text-primary);
}
.listening-option:hover { border-color: rgba(255, 107, 107, 0.25); }
.listening-option.selected { border-color: rgba(255, 107, 107, 0.5); background: rgba(255, 107, 107, 0.06); }
.option-letter {
    background: var(--bg-tertiary);
    width: 28px; height: 28px;
    display: flex; align-items: center; justify-content: center;
    border-radius: var(--radius-sm);
    font-weight: 600; font-size: 13px;
    flex-shrink: 0;
    color: var(--text-primary);
}

/* === READING === */
.reading-passage {
    background: var(--bg-card);
    border: 1px solid rgba(148, 163, 184, 0.06);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    font-size: 16px; line-height: 2;
    font-family: 'Noto Sans SC', sans-serif;
    color: var(--text-primary);
}
.reading-passage .word {
    cursor: pointer; padding: 2px 4px;
    border-radius: var(--radius-sm);
    transition: background 0.2s ease;
}
.reading-passage .word:hover { background: rgba(148, 163, 184, 0.08); }
.reading-question h3 { font-size: 18px; font-weight: 600; margin-bottom: var(--spacing-md); }

/* === GRAMMAR === */
.grammar-pattern {
    background: var(--bg-card);
    border: 1px solid rgba(148, 163, 184, 0.08);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 24px; text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}
.grammar-explanation h3 { font-size: 18px; margin-bottom: var(--spacing-sm); }
.grammar-examples { list-style: none; }
.grammar-examples li {
    background: rgba(148, 163, 184, 0.03);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}
.grammar-lesson-item {
    background: var(--bg-card);
    border: 1px solid rgba(148, 163, 184, 0.06);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    cursor: pointer;
    display: flex; align-items: center; gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    transition: all 0.3s ease;
}
.grammar-lesson-item:hover:not(.tilt-active) {
    border-color: rgba(255, 107, 107, 0.2);
    transform: translateX(6px);
}
.grammar-lesson-number {
    background: var(--color-primary);
    width: 36px; height: 36px;
    border-radius: var(--radius-md);
    display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 14px; flex-shrink: 0;
    color: white;
}

/* === SPEAKING === */
.speaking-text {
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 48px; text-align: center;
    margin-bottom: var(--spacing-md);
    font-weight: 700;
    color: var(--text-primary);
}
.speaking-pinyin {
    font-size: 18px; text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--text-secondary);
}

/* === ACHIEVEMENTS === */
.achievements-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    justify-content: center;
}
.achievement-card {
    background: var(--bg-card);
    border: 1px solid rgba(148, 163, 184, 0.06);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all 0.3s ease;
}
.achievement-card:hover:not(.tilt-active) {
    border-color: rgba(196, 179, 138, 0.3);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}
.achievement-card.locked {
    background: rgba(148, 163, 184, 0.015);
    opacity: 0.5;
}
.achievement-icon { font-size: 40px; margin-bottom: var(--spacing-md); }
.achievement-card h3 { font-size: 16px; font-weight: 600; margin-bottom: var(--spacing-xs); }
.achievement-card p { font-size: 13px; color: var(--text-secondary); }
.achievement-date { font-size: 12px; color: var(--text-muted); margin-top: var(--spacing-sm); }

/* === CHINESE SEAL STAMP === */
.chinese-seal {
    display: inline-flex; align-items: center; justify-content: center;
    width: 56px; height: 56px;
    border: 3px solid #ff6b6b;
    border-radius: var(--radius-sm);
    color: #ff6b6b;
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 14px; font-weight: 900;
    transform: rotate(-5deg);
    opacity: 0.85;
}

/* === MODAL === */
.modal {
    position: fixed; inset: 0;
    display: flex; align-items: center; justify-content: center;
    z-index: 10000;
}
.modal.hidden { display: none; }
.modal-overlay {
    position: absolute; inset: 0;
    background: rgba(0, 0, 0, 0.75);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
}
.modal-content {
    position: relative;
    background: var(--bg-secondary);
    border: 1px solid rgba(148, 163, 184, 0.08);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    max-width: 560px; width: 90%;
    max-height: 80vh; max-height: 80dvh; overflow-y: auto;
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
    color: var(--text-primary);
}
.modal-close {
    position: sticky; top: 8px; right: 8px;
    z-index: 10; float: right;
    background: rgba(255, 255, 255, 0.08); border: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 24px; cursor: pointer;
    width: 44px; height: 44px; min-width: 44px; min-height: 44px;
    display: flex; align-items: center; justify-content: center;
    border-radius: var(--radius-full);
    transition: all 0.2s ease;
    color: var(--text-secondary);
}
.modal-close:hover { background: rgba(148, 163, 184, 0.15); color: var(--text-primary); }

/* === TOAST === */
.toast-container {
    position: fixed; top: var(--spacing-lg); right: var(--spacing-lg);
    z-index: 10001; display: flex; flex-direction: column;
    gap: var(--spacing-sm); pointer-events: none;
}
.toast {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: 14px; font-weight: 500;
    color: white;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    pointer-events: auto;
    min-width: 240px;
}

/* === SITE FOOTER === */
.site-footer {
    margin-left: 240px;
    margin-top: var(--spacing-3xl);
    padding: var(--spacing-lg) var(--spacing-2xl) var(--spacing-xl);
    border-top: 1px solid rgba(148, 163, 184, 0.06);
    max-width: calc(100% - 240px);
}
.footer-content {
    display: flex; justify-content: center; gap: var(--spacing-xl);
    align-items: center; font-size: 13px; flex-wrap: wrap;
}
.footer-brand { color: var(--text-muted); text-align: center; }
.footer-links { display: flex; gap: var(--spacing-lg); }
.footer-links a {
    color: var(--text-muted); text-decoration: none;
    transition: color 0.2s ease;
}
.footer-links a:hover { color: var(--text-primary); }

/* === MOBILE NAV === */
.mobile-nav-toggle {
    display: none;
    position: fixed; top: var(--spacing-md); right: var(--spacing-md);
    z-index: 200;
    width: 44px; height: 44px;
    background: var(--bg-card);
    border: 1px solid rgba(148, 163, 184, 0.1);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 20px;
    color: var(--text-primary);
    align-items: center; justify-content: center;
}
.mobile-nav-overlay {
    display: none;
    position: fixed; inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
    -webkit-backdrop-filter: blur(2px);
    backdrop-filter: blur(2px);
}

/* === SELECTION === */
::selection {
    background: rgba(255, 107, 107, 0.25);
    color: var(--text-primary);
}

/* === GSAP READY === */
.gsap-reveal { opacity: 0; transform: translateY(30px); }
.gsap-reveal-left { opacity: 0; transform: translateX(-30px); }
.gsap-reveal-right { opacity: 0; transform: translateX(30px); }
.gsap-reveal-scale { opacity: 0; transform: scale(0.92); }
.gsap-reveal-visible { opacity: 1 !important; transform: none !important; }