/* ==========================================================================
   VoiceTutor AI - Modern Dark / Glassmorphism Design System
   ========================================================================== */

:root {
    --bg-dark: #0b0f19;
    --bg-card: rgba(18, 26, 43, 0.75);
    --bg-card-hover: rgba(28, 39, 64, 0.85);
    --bg-panel: rgba(13, 19, 33, 0.9);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-highlight: rgba(99, 102, 241, 0.4);
    
    /* Brand Colors & Gradients */
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --accent-cyan: #06b6d4;
    --accent-emerald: #10b981;
    --accent-amber: #f59e0b;
    --accent-rose: #f43f5e;
    
    /* Text Colors */
    --text-main: #f3f4f6;
    --text-muted: #9ca3af;
    --text-dim: #6b7280;
    
    /* Shadows & Effects */
    --glass-shadow: 0 20px 40px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.1);
    --glow-primary: 0 0 25px rgba(99, 102, 241, 0.4);
    --glow-emerald: 0 0 25px rgba(16, 185, 129, 0.4);
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --font-main: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-heading: 'Outfit', sans-serif;
}

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

body {
    background: var(--bg-dark);
    background-image: 
        radial-gradient(circle at 15% 15%, rgba(99, 102, 241, 0.15) 0%, transparent 40%),
        radial-gradient(circle at 85% 85%, rgba(6, 182, 212, 0.12) 0%, transparent 40%),
        radial-gradient(circle at 50% 50%, rgba(139, 92, 246, 0.08) 0%, transparent 60%);
    background-attachment: fixed;
    color: var(--text-main);
    font-family: var(--font-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    line-height: 1.6;
}

.app-container {
    width: 100%;
    max-width: 1380px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 28px;
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--glass-shadow);
}

.logo {
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    color: #fff;
    box-shadow: var(--glow-primary);
}

.logo-text h1 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.logo-text h1 span {
    background: linear-gradient(135deg, #818cf8, #c084fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-text p {
    font-size: 0.82rem;
    color: var(--text-muted);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 18px;
}

.sync-badge {
    background: rgba(6, 182, 212, 0.12);
    border: 1px solid rgba(6, 182, 212, 0.3);
    color: var(--accent-cyan);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.sync-badge:hover {
    background: rgba(6, 182, 212, 0.25);
    transform: translateY(-1px);
}

.sync-badge.synced {
    background: rgba(16, 185, 129, 0.15);
    border-color: rgba(16, 185, 129, 0.4);
    color: var(--accent-emerald);
}

.volume-config, .voice-config, .speed-config {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.88rem;
    color: var(--text-muted);
}

.styled-range {
    accent-color: var(--accent-cyan);
    width: 80px;
    cursor: pointer;
}

.volume-val-badge {
    font-size: 0.8rem;
    color: var(--accent-cyan);
    font-weight: 600;
    min-width: 75px;
}

.styled-select {
    background: rgba(0, 0, 0, 0.4);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    outline: none;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s ease;
}

.styled-select:hover {
    border-color: var(--primary);
}

.speed-btns {
    display: flex;
    background: rgba(0, 0, 0, 0.4);
    padding: 4px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

.speed-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 6px 12px;
    font-size: 0.8rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.speed-btn.active, .speed-btn:hover {
    background: var(--primary);
    color: #fff;
    font-weight: 600;
}

/* ==========================================================================
   Stats Bar
   ========================================================================== */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.stat-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    padding: 16px 20px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: var(--glass-shadow);
}

.stat-card i {
    font-size: 1.8rem;
}

.stat-value {
    display: block;
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-main);
}

.stat-label {
    font-size: 0.82rem;
    color: var(--text-muted);
}

.text-amber { color: var(--accent-amber); }
.text-emerald { color: var(--accent-emerald); }
.text-cyan { color: var(--accent-cyan); }

/* ==========================================================================
   Main Content Layout
   ========================================================================== */
.main-content {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 20px;
}

/* Sidebar */
.sidebar-panel {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    box-shadow: var(--glass-shadow);
}

.panel-header h3 {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 10px;
}

.category-tabs {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.tab-btn {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-muted);
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    text-align: left;
    font-size: 0.88rem;
    font-family: inherit;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all 0.2s ease;
}

.tab-btn:hover {
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-main);
}

.tab-btn.active {
    background: rgba(99, 102, 241, 0.15);
    border-color: var(--border-highlight);
    color: #fff;
    font-weight: 600;
}

.topic-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    overflow-y: auto;
    max-height: 480px;
    padding-right: 4px;
}

.topic-item {
    padding: 12px;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
}

.topic-item:hover {
    border-color: rgba(99, 102, 241, 0.3);
    transform: translateX(3px);
}

.topic-item.active {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(139, 92, 246, 0.15));
    border-color: var(--primary);
}

.topic-item-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-main);
}

.topic-item-subtitle {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* Workspace */
.workspace-panel {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.mode-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    padding: 12px 20px;
    border-radius: var(--radius-md);
}

.mode-buttons {
    display: flex;
    gap: 8px;
}

.mode-btn {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-muted);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.88rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.mode-btn.active {
    background: var(--primary-gradient);
    color: #fff;
    font-weight: 600;
    box-shadow: var(--glow-primary);
}

.mode-info {
    font-size: 0.82rem;
    color: var(--accent-cyan);
}

/* Vocab Module */
.vocab-module-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-highlight);
    border-radius: var(--radius-lg);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    box-shadow: var(--glass-shadow);
}

.vocab-toolbar {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.search-box {
    position: relative;
    width: 100%;
}

.search-box i {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.search-box input {
    width: 100%;
    padding: 12px 16px 12px 46px;
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: #fff;
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
}

.search-box input:focus {
    border-color: var(--primary);
}

.vocab-filter-btns {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.filter-chip {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.82rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.filter-chip:hover, .filter-chip.active {
    background: rgba(99, 102, 241, 0.2);
    border-color: var(--primary);
    color: #fff;
    font-weight: 600;
}

.flashcard-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.flashcard {
    position: relative;
    width: 100%;
    max-width: 540px;
    min-height: 260px;
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.9), rgba(15, 23, 42, 0.95));
    border: 1px solid var(--border-highlight);
    border-radius: var(--radius-xl);
    padding: 32px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4), var(--glow-primary);
    transition: all 0.3s ease;
    user-select: none;
    cursor: pointer;
}

.card-tag {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--accent-cyan);
    background: rgba(6, 182, 212, 0.1);
    padding: 4px 12px;
    border-radius: 12px;
    margin-bottom: 12px;
}

.card-word {
    font-family: var(--font-heading);
    font-size: 2.8rem;
    font-weight: 700;
    color: #fff;
    letter-spacing: -1px;
}

.card-ipa {
    font-size: 1.1rem;
    color: var(--accent-emerald);
    margin-top: 4px;
}

.card-audio-btn {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    color: #fff;
    margin-top: 16px;
    cursor: pointer;
    box-shadow: var(--glow-primary);
    transition: all 0.2s ease;
}

.card-audio-btn:hover {
    transform: scale(1.1);
}

.card-flip-hint {
    font-size: 0.8rem;
    color: var(--text-dim);
    margin-top: 16px;
}

.card-side.card-back {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.card-pos {
    font-size: 0.88rem;
    color: var(--accent-amber);
}

.card-cn {
    font-size: 1.5rem;
    font-weight: 600;
    color: #fff;
}

.card-example-box {
    background: rgba(0, 0, 0, 0.4);
    border-radius: var(--radius-md);
    padding: 12px 18px;
    margin-top: 10px;
    width: 100%;
}

.ex-en {
    font-size: 1rem;
    font-weight: 500;
    color: var(--accent-cyan);
}

.ex-cn {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 2px;
}

.flashcard-controls {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}

/* Modal Dialog */
.modal-backdrop {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(12px);
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-card {
    background: var(--bg-panel);
    border: 1px solid var(--border-highlight);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 520px;
    padding: 24px;
    box-shadow: var(--glass-shadow);
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 1.1rem;
    color: #fff;
}

.modal-close-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.6rem;
    cursor: pointer;
}

.modal-tip {
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.sync-input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sync-input-group label {
    font-size: 0.85rem;
    color: var(--accent-cyan);
}

.sync-input-group input {
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border-color);
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    color: #fff;
    font-family: inherit;
    outline: none;
}

.modal-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* Custom Text Card */
.custom-input-card {
    background: var(--bg-card);
    border: 1px solid var(--border-highlight);
    border-radius: var(--radius-lg);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.custom-input-card h4 {
    font-size: 1rem;
    color: var(--text-main);
}

.custom-input-card textarea {
    width: 100%;
    height: 100px;
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 12px;
    color: var(--text-main);
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
    resize: vertical;
}

.custom-actions {
    display: flex;
    gap: 10px;
}

/* Banner & Sentences */
.topic-banner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.8), rgba(15, 23, 42, 0.9));
    border: 1px solid var(--border-color);
    padding: 20px 24px;
    border-radius: var(--radius-lg);
}

.topic-banner h2 {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    color: #fff;
}

.topic-subtitle {
    font-size: 0.88rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.progress-indicator {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 6px;
}

.progress-indicator span {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.progress-bar {
    width: 140px;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 20%;
    background: var(--primary-gradient);
    border-radius: 3px;
    transition: width 0.3s ease;
}

.sentence-card {
    position: relative;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    box-shadow: var(--glass-shadow);
}

.blur-overlay {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(11, 15, 25, 0.92);
    backdrop-filter: blur(12px);
    border-radius: var(--radius-lg);
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
}

.blur-content {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.blur-icon {
    font-size: 2.5rem;
    color: var(--accent-cyan);
}

.ipa-line {
    font-family: var(--font-main);
    font-size: 0.95rem;
    color: var(--accent-cyan);
    letter-spacing: 0.5px;
}

.target-sentence {
    font-family: var(--font-heading);
    font-size: 1.65rem;
    font-weight: 600;
    line-height: 1.4;
    color: #fff;
}

.cn-translation {
    font-size: 1.05rem;
    color: var(--text-muted);
}

.vocab-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 6px;
}

.chip {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.82rem;
    color: var(--text-muted);
}

.chip strong {
    color: var(--accent-cyan);
}

/* Controls */
.audio-control-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
}

.control-btn {
    border: none;
    font-family: inherit;
    font-size: 0.9rem;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.primary-play {
    background: var(--primary-gradient);
    color: #fff;
    font-weight: 600;
    box-shadow: var(--glow-primary);
}

.primary-play:hover {
    transform: translateY(-2px);
}

.slow-play {
    background: rgba(245, 158, 11, 0.15);
    border: 1px solid rgba(245, 158, 11, 0.3);
    color: var(--accent-amber);
}

.slow-play:hover {
    background: rgba(245, 158, 11, 0.25);
}

.icon-only {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-main);
    padding: 10px 14px;
}

.icon-only:hover {
    background: rgba(255, 255, 255, 0.12);
}

/* Recording Card */
.recording-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    box-shadow: var(--glass-shadow);
}

.recording-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.recording-header h3 {
    font-size: 1.05rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.browser-mic-badge {
    font-size: 0.78rem;
    color: var(--accent-emerald);
    background: rgba(16, 185, 129, 0.1);
    padding: 4px 10px;
    border-radius: 12px;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.mic-workspace {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px 0;
    gap: 16px;
}

.record-trigger-btn {
    position: relative;
    background: transparent;
    border: none;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    outline: none;
}

.mic-icon-circle {
    width: 76px;
    height: 76px;
    border-radius: 50%;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: #fff;
    box-shadow: var(--glow-primary);
    transition: all 0.3s ease;
}

.record-trigger-btn:hover .mic-icon-circle {
    transform: scale(1.06);
}

.record-trigger-btn.recording .mic-icon-circle {
    background: linear-gradient(135deg, #f43f5e 0%, #e11d48 100%);
    box-shadow: 0 0 30px rgba(244, 63, 94, 0.6);
    animation: pulseMic 1.2s infinite alternate;
}

@keyframes pulseMic {
    0% { transform: scale(1); }
    100% { transform: scale(1.12); }
}

.record-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* Audio Waves */
.recording-waves {
    display: flex;
    align-items: center;
    gap: 4px;
    height: 24px;
}

.wave-bar {
    width: 4px;
    height: 100%;
    background: var(--accent-rose);
    border-radius: 2px;
    animation: waveMotion 1s infinite ease-in-out alternate;
}

.wave-bar:nth-child(2) { animation-delay: 0.2s; }
.wave-bar:nth-child(3) { animation-delay: 0.4s; }
.wave-bar:nth-child(4) { animation-delay: 0.6s; }
.wave-bar:nth-child(5) { animation-delay: 0.8s; }

@keyframes waveMotion {
    0% { height: 6px; }
    100% { height: 24px; }
}

/* Evaluation Results */
.result-panel {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-highlight);
    border-radius: var(--radius-md);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.result-header {
    display: flex;
    align-items: center;
    gap: 16px;
}

.score-badge {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    box-shadow: var(--glow-primary);
}

.score-badge.high-score {
    background: linear-gradient(135deg, #10b981, #059669);
    box-shadow: var(--glow-emerald);
}

.score-number {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
}

.score-unit {
    font-size: 0.8rem;
}

.score-meta h4 {
    font-size: 1.1rem;
    color: #fff;
}

.score-meta p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.speech-comparison {
    background: rgba(0, 0, 0, 0.4);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
}

.comparison-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.diff-text {
    font-size: 1.1rem;
    line-height: 1.5;
}

.word-correct { color: #34d399; font-weight: 600; }
.word-missed { color: #f87171; text-decoration: line-through; opacity: 0.85; }
.word-extra { color: #fbbf24; }

.dialogue-script-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.script-header h3 {
    font-size: 1rem;
    color: var(--text-main);
}

.script-lines {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.script-line-item {
    padding: 12px 16px;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.script-line-item:hover {
    border-color: rgba(99, 102, 241, 0.3);
    background: rgba(255, 255, 255, 0.03);
}

.script-line-item.active {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.15);
}

.line-en { font-weight: 500; color: #fff; font-size: 0.92rem; }
.line-cn { font-size: 0.8rem; color: var(--text-muted); }

/* Buttons */
.btn {
    padding: 10px 18px;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.btn-primary {
    background: var(--primary-gradient);
    color: #fff;
    box-shadow: var(--glow-primary);
}

.btn-primary:hover { opacity: 0.95; transform: translateY(-1px); }
.btn-secondary { background: rgba(255, 255, 255, 0.08); color: var(--text-main); }
.btn-outline { background: transparent; border: 1px solid var(--border-highlight); color: var(--text-main); }
.btn-outline:hover { background: rgba(99, 102, 241, 0.1); }

.hidden { display: none !important; }

/* Toast Notification */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 300;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    background: var(--bg-panel);
    border: 1px solid var(--border-highlight);
    padding: 12px 20px;
    border-radius: var(--radius-md);
    color: #fff;
    box-shadow: var(--glass-shadow);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    animation: fadeInToast 0.3s ease;
}

@keyframes fadeInToast {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Mobile & Touch Responsiveness (<768px) */
@media (max-width: 768px) {
    .app-container { padding: 12px; gap: 14px; }
    .app-header { flex-direction: column; gap: 14px; align-items: stretch; padding: 16px; }
    .header-actions { flex-wrap: wrap; justify-content: space-between; gap: 10px; }
    .main-content { grid-template-columns: 1fr; }
    .stats-bar { grid-template-columns: 1fr; }
    .flashcard { min-height: 220px; padding: 20px; }
    .card-word { font-size: 2.2rem; }
    .mode-bar { flex-direction: column; gap: 10px; align-items: stretch; }
    .mode-buttons { overflow-x: auto; padding-bottom: 4px; }
}