:root {
    --primary: #6366F1;
    --primary-light: #818CF8;
    --primary-dark: #4F46E5;
    --primary-gradient: linear-gradient(135deg, #6366F1 0%, #8B5CF6 100%);
    --primary-soft: rgba(99, 102, 241, 0.08);
    --danger: #EF4444;
    --danger-light: #F87171;
    --success: #10B981;
    --warning: #F59E0B;
    --bg: #F8FAFC;
    --surface: #FFFFFF;
    --surface-elevated: #FFFFFF;
    --text: #0F172A;
    --text-secondary: #64748B;
    --text-muted: #94A3B8;
    --border: #E2E8F0;
    --border-light: #F1F5F9;
    --radius-sm: 10px;
    --radius: 16px;
    --radius-lg: 24px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -2px rgba(0,0,0,0.04);
    --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);
    --shadow-xl: 0 25px 50px -12px rgba(99, 102, 241, 0.25);
    --max-width: 900px;
    --sidebar-width: 240px;
}

/* ===== Theme: Dark ===== */
[data-theme="dark"] {
    --bg: #0F172A;
    --surface: #1E293B;
    --surface-elevated: #334155;
    --text: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    --border: #334155;
    --border-light: #1E293B;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.3), 0 2px 4px -2px rgba(0,0,0,0.2);
    --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.4), 0 8px 10px -6px rgba(0,0,0,0.3);
}

/* ===== Theme: Warm ===== */
[data-theme="warm"] {
    --primary: #D97706;
    --primary-light: #F59E0B;
    --primary-dark: #B45309;
    --primary-gradient: linear-gradient(135deg, #D97706 0%, #F59E0B 100%);
    --primary-soft: rgba(217, 119, 6, 0.08);
    --bg: #FFFBEB;
    --surface: #FFFFFF;
    --border: #FDE68A;
    --border-light: #FEF3C7;
}

/* ===== Theme: Green ===== */
[data-theme="green"] {
    --primary: #059669;
    --primary-light: #10B981;
    --primary-dark: #047857;
    --primary-gradient: linear-gradient(135deg, #059669 0%, #10B981 100%);
    --primary-soft: rgba(5, 150, 105, 0.08);
    --bg: #ECFDF5;
    --surface: #FFFFFF;
    --border: #A7F3D0;
    --border-light: #D1FAE5;
}

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

body {
    font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    padding-bottom: 80px;
    transition: background 0.3s ease, color 0.3s ease;
}

/* ===== Desktop Layout ===== */
.desktop-layout {
    display: flex;
    min-height: 100vh;
}

.desktop-sidebar {
    display: none;
    width: var(--sidebar-width);
    background: var(--surface);
    border-right: 1px solid var(--border);
    flex-shrink: 0;
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 60;
    flex-direction: column;
    padding: 20px 0;
}

.desktop-sidebar .sidebar-logo {
    padding: 0 20px 20px;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary);
    border-bottom: 1px solid var(--border-light);
    margin-bottom: 12px;
}

.desktop-sidebar .sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 0 12px;
    flex: 1;
}

.desktop-sidebar .sidebar-nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    border: none;
    background: none;
    color: var(--text-secondary);
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
    font-weight: 500;
}

.desktop-sidebar .sidebar-nav-item:hover {
    background: var(--primary-soft);
    color: var(--primary);
}

.desktop-sidebar .sidebar-nav-item.active {
    background: var(--primary-soft);
    color: var(--primary);
    font-weight: 600;
}

.desktop-sidebar .sidebar-nav-item .nav-icon {
    font-size: 1.3rem;
    width: 24px;
    text-align: center;
}

.desktop-sidebar .sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border-light);
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.help-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--border-light);
    color: var(--text-muted);
    font-size: 0.8rem;
    text-decoration: none;
    transition: all 0.2s;
    flex-shrink: 0;
}

.help-link:hover {
    background: var(--primary-soft);
    color: var(--primary);
}

.desktop-main {
    flex: 1;
    margin-left: 0;
    width: 100%;
}

.page {
    display: none;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    animation: fadeIn 0.3s ease;
}
.page.active { display: block; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== Header ===== */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-light);
    gap: 12px;
}

header h1 {
    font-size: 1.4rem;
    font-weight: 700;
    flex: 1;
    letter-spacing: -0.3px;
}

.back-btn {
    background: var(--surface);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1.2rem;
    color: var(--text-secondary);
    padding: 8px 14px;
    cursor: pointer;
    flex-shrink: 0;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
}

.back-btn:hover {
    border-color: var(--primary-light);
    color: var(--primary);
    background: var(--primary-soft);
}

.session-info {
    flex: 1;
    text-align: center;
    min-width: 0;
}

.session-info .student-name {
    font-weight: 600;
    font-size: 1rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.session-info .subject-name {
    font-size: 0.85rem;
    margin-top: 2px;
}

.icon-btn {
    background: var(--surface);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 10px 16px;
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
    font-weight: 500;
}

.icon-btn:hover, .icon-btn.active {
    background: var(--primary-soft);
    border-color: var(--primary-light);
    color: var(--primary);
}

/* ===== Bottom Nav ===== */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    height: 64px;
    background: rgba(255,255,255,0.92);
    border-top: 1px solid var(--border);
    padding-bottom: env(safe-area-inset-bottom);
    z-index: 50;
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
}

.bottom-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    min-width: 64px;
    height: 100%;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 0.7rem;
    cursor: pointer;
    transition: color 0.2s;
    position: relative;
}

.bottom-nav-item .nav-icon {
    font-size: 1.4rem;
    transition: transform 0.2s ease;
}

.bottom-nav-item.active {
    color: var(--primary);
}

.bottom-nav-item.active .nav-icon {
    transform: translateY(-2px);
}

.bottom-nav-item.active::after {
    content: '';
    position: absolute;
    bottom: 6px;
    width: 20px;
    height: 3px;
    background: var(--primary);
    border-radius: 2px;
}

/* ===== Search ===== */
.search-section {
    margin-bottom: 20px;
}

.search-bar {
    display: flex;
    align-items: center;
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    padding: 12px 16px;
    gap: 10px;
    transition: all 0.2s;
}

.search-bar:focus-within {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 4px var(--primary-soft);
}

.search-bar input {
    flex: 1;
    border: none;
    background: none;
    font-size: 1rem;
    outline: none;
    color: var(--text);
}

.search-icon {
    font-size: 1.1rem;
    color: var(--text-muted);
}

.clear-search {
    background: var(--border-light);
    border: none;
    color: var(--text-muted);
    font-size: 0.85rem;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
    transition: all 0.2s;
}

.clear-search:hover {
    background: var(--border);
    color: var(--text-secondary);
}

.student-count {
    margin-top: 8px;
    font-size: 0.85rem;
    color: var(--text-muted);
    padding-left: 4px;
}

/* ===== Student Cards ===== */
.students-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.student-card {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px;
    background: var(--surface);
    border-radius: var(--radius);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.student-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--primary);
    border-radius: var(--radius) 0 0 var(--radius);
    opacity: 0;
    transition: opacity 0.2s;
}

.student-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
    border-color: var(--border);
}

.student-card:active {
    transform: scale(0.98);
}

.student-card.selected {
    border-color: var(--primary);
    background: var(--primary-soft);
}

.student-card.selected::before {
    opacity: 1;
}

.student-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 1.2rem;
    flex-shrink: 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.12);
}

.student-info {
    flex: 1;
    min-width: 0;
}

.student-info .student-name {
    font-weight: 600;
    font-size: 1.05rem;
    margin-bottom: 6px;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 6px;
}

.trial-badge {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--danger);
    background: rgba(239, 68, 68, 0.1);
    padding: 2px 8px;
    border-radius: 10px;
    border: 1px solid var(--danger-light);
}

.student-subjects {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.subject-tag {
    font-size: 0.75rem;
    padding: 3px 10px;
    border-radius: 12px;
    font-weight: 500;
}

.student-menu-btn {
    background: none;
    border: none;
    font-size: 1.4rem;
    color: var(--text-muted);
    padding: 8px;
    cursor: pointer;
    flex-shrink: 0;
    transition: color 0.2s;
    border-radius: 8px;
}

.student-menu-btn:hover {
    color: var(--primary);
    background: var(--primary-soft);
}

.select-indicator {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 2px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 0.85rem;
    flex-shrink: 0;
    transition: all 0.2s;
}

.student-card.selected .select-indicator {
    background: var(--primary);
    border-color: var(--primary);
}

/* ===== FAB Button ===== */
.fab-btn {
    position: fixed;
    right: 20px;
    bottom: 84px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--primary-gradient);
    color: white;
    border: none;
    font-size: 1.8rem;
    font-weight: 300;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 40;
    transition: all 0.2s ease;
}

.fab-btn:hover {
    transform: scale(1.08);
    box-shadow: var(--shadow-xl);
}

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

/* ===== Group Action Bar ===== */
.group-action-bar {
    position: fixed;
    bottom: 64px;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 24px;
    background: rgba(255,255,255,0.95);
    border-top: 1px solid var(--border);
    box-shadow: 0 -4px 20px rgba(0,0,0,0.06);
    z-index: 45;
    backdrop-filter: blur(10px);
}

.group-action-bar span {
    font-weight: 600;
    color: var(--text);
    font-size: 0.95rem;
}

.group-action-bar .primary-btn {
    width: auto;
    padding: 10px 24px;
    font-size: 0.9rem;
    margin-bottom: 0;
}

/* ===== Subject Grid ===== */
.subjects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.subject-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 32px 16px;
    background: var(--surface);
    border-radius: var(--radius);
    border: 2px solid var(--border);
    cursor: pointer;
    transition: all 0.25s ease;
    box-shadow: var(--shadow-sm);
}

.subject-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
    border-color: var(--subject-color, var(--primary));
}

.subject-card:active {
    transform: scale(0.96);
}

.subject-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    transition: transform 0.2s ease;
}

.subject-card:hover .subject-icon {
    transform: scale(1.1);
}

.subject-name-text {
    font-weight: 600;
    color: var(--text);
    font-size: 0.95rem;
}

/* ===== Record Section ===== */
.record-section {
    text-align: center;
    padding: 32px 0;
}

.record-btn {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    border: none;
    background: var(--primary-gradient);
    color: white;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin: 0 auto 16px;
    box-shadow: var(--shadow-xl);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.record-btn::after {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    border: 2px solid var(--primary-light);
    opacity: 0;
    transition: all 0.3s;
}

.record-btn:hover {
    transform: scale(1.05);
}

.record-btn:hover::after {
    opacity: 0.5;
    inset: -8px;
}

.record-btn.recording {
    background: linear-gradient(135deg, #EF4444 0%, #DC2626 100%);
    animation: pulse-ring 2s ease-out infinite;
}

@keyframes pulse-ring {
    0% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4); }
    70% { box-shadow: 0 0 0 30px rgba(239, 68, 68, 0); }
    100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); }
}

.record-icon { font-size: 2.2rem; }
.record-text { font-size: 1rem; font-weight: 600; }
.record-status { color: var(--text-muted); font-size: 0.9rem; margin-top: 4px; }
.record-hint { color: var(--text-muted); font-size: 0.8rem; margin-top: 8px; text-align: center; padding: 0 20px; }

/* 长按录音视觉反馈 */
.record-btn.recording-active {
    transform: scale(1.15);
    box-shadow: 0 0 0 20px rgba(99, 102, 241, 0.3), var(--shadow-xl);
}

.record-btn.recording-active .record-icon {
    animation: micShake 0.5s ease-in-out infinite;
}

@keyframes micShake {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

/* 录音波纹效果 */
.record-btn.recording::before {
    content: '';
    position: absolute;
    inset: -10px;
    border-radius: 50%;
    border: 2px solid rgba(239, 68, 68, 0.3);
    animation: recordRipple 1.5s ease-out infinite;
}

@keyframes recordRipple {
    0% { transform: scale(1); opacity: 1; }
    100% { transform: scale(1.5); opacity: 0; }
}

/* 长按提示 */
.long-press-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 4px;
    opacity: 0.7;
}

@media (hover: none) and (pointer: coarse) {
    .long-press-hint {
        display: block;
    }
}

@media (hover: hover) {
    .long-press-hint {
        display: none;
    }
}

/* ===== Transcript ===== */
.transcript-section {
    margin-bottom: 20px;
}

.transcript-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.transcript-header label {
    font-weight: 600;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 6px;
}

.clear-btn {
    background: var(--border-light);
    border: none;
    color: var(--text-muted);
    font-size: 0.85rem;
    cursor: pointer;
    padding: 6px 12px;
    border-radius: 8px;
    transition: all 0.2s;
}

.clear-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

#transcript {
    width: 100%;
    min-height: 200px;
    padding: 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
    resize: vertical;
    font-family: inherit;
    line-height: 1.7;
    background: var(--surface);
    transition: all 0.2s;
    color: var(--text);
}

#transcript:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 4px var(--primary-soft);
}

#transcript::placeholder {
    color: var(--text-muted);
}

/* ===== Buttons ===== */
.primary-btn {
    width: 100%;
    padding: 16px;
    border: none;
    border-radius: var(--radius-sm);
    background: var(--primary-gradient);
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
    position: relative;
    overflow: hidden;
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.primary-btn:active {
    transform: translateY(0);
}

.secondary-btn {
    width: 100%;
    padding: 14px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-bottom: 10px;
}

.secondary-btn:hover {
    background: var(--bg);
    border-color: var(--primary-light);
    color: var(--primary);
}

.danger-btn {
    width: 100%;
    padding: 14px;
    border: 1.5px solid var(--danger-light);
    border-radius: var(--radius-sm);
    background: rgba(239, 68, 68, 0.05);
    color: var(--danger);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-top: 10px;
}

.danger-btn:hover {
    background: rgba(239, 68, 68, 0.1);
}

/* ===== Form ===== */
.form-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

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

.form-group label {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text);
}

.form-group input[type="text"],
.form-group input[type="password"] {
    padding: 14px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    background: var(--surface);
    transition: all 0.2s;
    color: var(--text);
    width: 100%;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 4px var(--primary-soft);
}

.form-group input::placeholder {
    color: var(--text-muted);
}

/* Subject Checkboxes */
.subject-checkboxes {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.subject-checkbox-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s;
    user-select: none;
}

.subject-checkbox-item:has(input:checked) {
    border-color: var(--subject-color, var(--primary));
    background: var(--primary-soft);
}

.subject-checkbox-item input {
    display: none;
}

.check-box {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.subject-checkbox-item input:checked + .check-box {
    border-color: var(--subject-color, var(--primary));
    background: var(--subject-color, var(--primary));
}

.check-mark {
    width: 10px;
    height: 10px;
    border-radius: 2px;
    opacity: 0;
    transition: opacity 0.2s;
}

.subject-checkbox-item input:checked + .check-box .check-mark {
    opacity: 1;
}

.subject-label {
    font-size: 0.95rem;
    color: var(--text);
}

/* ===== Settings ===== */
.settings-sections {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.settings-group {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 20px;
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
}

.settings-group h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 8px;
}

.manage-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-light);
    gap: 12px;
}

.manage-item:last-child {
    border-bottom: none;
}

.manage-item-info {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1;
    min-width: 0;
}

.color-dot {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    flex-shrink: 0;
}

.manage-item-name {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text);
}

.manage-item-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.color-picker {
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    padding: 0;
    background: none;
    overflow: hidden;
}

.delete-btn {
    background: none;
    border: none;
    font-size: 1.1rem;
    cursor: pointer;
    padding: 6px;
    opacity: 0.5;
    transition: all 0.2s;
    border-radius: 6px;
}

.delete-btn:hover {
    opacity: 1;
    background: rgba(239, 68, 68, 0.1);
}

/* ===== History ===== */
.history-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* 日期分组样式 */
.history-date-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.history-date-label {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 4px;
    position: relative;
}

.history-date-label::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}

.date-label-text {
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text);
    white-space: nowrap;
}

.date-label-count {
    font-size: 0.8rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.history-date-items {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.history-item {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 16px;
    border: 1px solid var(--border-light);
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: var(--shadow-sm);
}

.history-item:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow);
    transform: translateY(-1px);
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.history-subject {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text);
}

.history-date {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.history-summary {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.history-actions {
    display: flex;
    gap: 12px;
    margin-top: 12px;
}

.history-view-btn, .history-delete-btn {
    background: none;
    border: none;
    font-size: 0.85rem;
    cursor: pointer;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    transition: all 0.2s;
    font-weight: 500;
}

.history-view-btn {
    color: var(--primary);
    background: var(--primary-soft);
}

.history-view-btn:hover {
    background: rgba(99, 102, 241, 0.15);
}

.history-delete-btn {
    color: var(--danger);
    background: rgba(239, 68, 68, 0.08);
}

.history-delete-btn:hover {
    background: rgba(239, 68, 68, 0.15);
}

/* History Detail in Bottom Sheet */
.history-detail {
    max-height: 70vh;
    overflow-y: auto;
}

.history-detail .detail-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-light);
}

.history-detail .detail-header h3 {
    font-size: 1.1rem;
}

/* ===== Modal ===== */
.modal {
    display: none;
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(4px);
    z-index: 100;
    align-items: flex-end;
    justify-content: center;
    padding: 0;
}

.modal.active { display: flex; }

.modal-content {
    background: var(--surface);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    width: 100%;
    max-width: 560px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    animation: slideUp 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideUp {
    from { transform: translateY(100%); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.modal-content header {
    padding: 20px 24px 16px;
    border-bottom: 1px solid var(--border-light);
    margin-bottom: 0;
    position: sticky;
    top: 0;
    background: var(--surface);
    z-index: 1;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-content header h2 {
    font-size: 1.2rem;
    font-weight: 700;
}

.close-btn {
    background: var(--bg);
    border: none;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    font-size: 1.25rem;
    cursor: pointer;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.close-btn:hover {
    background: var(--border);
    color: var(--text);
}

.modal-body {
    padding: 24px;
}

.modal footer {
    padding: 0 24px 24px;
    position: sticky;
    bottom: 0;
    background: var(--surface);
}

/* ===== Bottom Sheet ===== */
.bottom-sheet {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 200;
}

.bottom-sheet.active {
    display: block;
}

.bottom-sheet::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(2px);
}

.bottom-sheet-content {
    position: relative;
    background: var(--surface);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    padding: 20px;
    animation: slideUp 0.3s ease;
    max-height: 80vh;
    overflow-y: auto;
}

.action-sheet button {
    width: 100%;
    padding: 16px;
    background: none;
    border: none;
    border-bottom: 1px solid var(--border-light);
    font-size: 1rem;
    cursor: pointer;
    text-align: center;
    color: var(--text);
    transition: background 0.2s;
    font-weight: 500;
}

.action-sheet button:hover {
    background: var(--bg);
}

.action-sheet button.danger {
    color: var(--danger);
}

.action-sheet button:last-child {
    border-bottom: none;
    color: var(--text-muted);
    margin-top: 8px;
    background: var(--bg);
    border-radius: var(--radius-sm);
    font-weight: 500;
}

/* ===== Feedback Content ===== */
.feedback-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
    padding: 12px 16px;
    background: var(--primary-soft);
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
    text-align: center;
    border: 1.5px solid var(--primary-light);
    letter-spacing: 0.5px;
}

.feedback-section {
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-light);
}

.feedback-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.feedback-section h3 {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
    letter-spacing: 0.5px;
}

.feedback-content {
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--text);
    padding: 12px;
    background: var(--bg);
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    transition: border-color 0.2s;
    white-space: pre-wrap;
}

.feedback-content:hover {
    border-color: var(--primary-light);
}

.feedback-content:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--surface);
}

.feedback-edit-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 6px;
    text-align: right;
}

/* ===== Empty State ===== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: 16px;
    opacity: 0.7;
}

.empty-state p {
    font-size: 1rem;
    margin-bottom: 16px;
}

/* ===== Help Modal ===== */
#help-modal h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
    margin: 20px 0 12px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--primary-light);
    display: inline-block;
}

#help-modal h3:first-child {
    margin-top: 0;
}

#help-modal ol {
    margin: 12px 0 12px 24px;
    color: var(--text-secondary);
}

#help-modal li {
    margin-bottom: 8px;
    line-height: 1.7;
}

#help-modal a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

#help-modal .hint {
    background: linear-gradient(135deg, #FEF3C7 0%, #FDE68A 100%);
    padding: 14px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    color: #92400E;
    margin-top: 12px;
    border: 1px solid #FCD34D;
}

/* ===== Toast ===== */
.toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text);
    color: white;
    padding: 14px 28px;
    border-radius: 50px;
    font-size: 0.9rem;
    z-index: 1000;
    animation: fadeInUp 0.3s ease;
    white-space: nowrap;
    box-shadow: var(--shadow-lg);
    font-weight: 500;
}

/* ===== Loading ===== */
#loading-overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(248, 250, 252, 0.95);
    backdrop-filter: blur(8px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    transition: opacity 0.3s;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* ===== Animations ===== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateX(-50%) translateY(20px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

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

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ===== Theme Selector ===== */
.theme-selector {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.theme-option {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.9rem;
    font-weight: 500;
}

.theme-option:hover {
    border-color: var(--primary-light);
}

.theme-option.active {
    border-color: var(--primary);
    background: var(--primary-soft);
}

.theme-dot {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: 2px solid var(--border);
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
    .page { padding: 16px; }
    header { margin-bottom: 20px; }
    header h1 { font-size: 1.2rem; }
    .record-btn { width: 140px; height: 140px; }
    .record-section { padding: 24px 0; }
    .modal-content { border-radius: var(--radius-lg) var(--radius-lg) 0 0; }
    .subjects-grid { gap: 12px; }
    .subject-card { padding: 24px 12px; }
}

@media (min-width: 641px) {
    .modal {
        align-items: center;
        padding: 20px;
    }
    .modal-content {
        border-radius: var(--radius-lg);
        max-height: 85vh;
    }
}

/* Desktop wide screen */
@media (min-width: 1024px) {
    body {
        padding-bottom: 0;
    }
    .bottom-nav {
        display: none !important;
    }
    .desktop-sidebar {
        display: flex;
    }
    .desktop-main {
        margin-left: var(--sidebar-width);
    }
    .page {
        max-width: 1000px;
        padding: 32px 40px;
    }
    .fab-btn {
        right: 40px;
        bottom: 40px;
    }
    .group-action-bar {
        bottom: 0;
        left: var(--sidebar-width);
    }
    .students-list {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    .student-card {
        margin-bottom: 0;
    }
    .subjects-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    /* ===== 1. 侧边栏悬停效果和活跃状态高亮增强 ===== */
    .desktop-sidebar .sidebar-nav-item {
        padding: 10px 16px;
        border-radius: 8px;
        transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        position: relative;
    }
    .desktop-sidebar .sidebar-nav-item:hover {
        background: var(--primary-soft);
        color: var(--primary);
        transform: translateX(4px);
        box-shadow: var(--shadow-sm);
    }
    .desktop-sidebar .sidebar-nav-item.active {
        background: var(--primary-soft);
        color: var(--primary);
        font-weight: 600;
        box-shadow: inset 3px 0 0 var(--primary);
        border-radius: 0 8px 8px 0;
    }
    .desktop-sidebar .sidebar-nav-item.active:hover {
        transform: translateX(2px);
    }

    /* ===== 2. 录音页面双列布局 ===== */
    .record-page-layout {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 24px;
        align-items: start;
    }
    .record-page-left {
        display: flex;
        flex-direction: column;
        gap: 20px;
    }
    .record-page-right {
        display: flex;
        flex-direction: column;
        gap: 20px;
    }

    /* ===== 3. 设置页面双列布局 + 保存按钮横跨两列 ===== */
    .settings-sections {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
    .settings-group {
        margin-bottom: 0;
    }
    .settings-sections > .primary-btn,
    .settings-sections > .hint-text {
        grid-column: 1 / -1;
    }

    /* ===== 4. 历史反馈页面双列网格 ===== */
    .history-list {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    /* 日期分组在双列网格中横跨两列 */
    .history-date-group {
        grid-column: 1 / -1;
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
    /* 日期分组标签横跨两列 */
    .history-date-label {
        grid-column: 1 / -1;
    }

    /* ===== 5. 学生卡片悬停上浮效果 ===== */
    .student-card {
        transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .student-card:hover {
        box-shadow: var(--shadow-lg);
        transform: translateY(-4px);
        border-color: var(--primary-light);
    }
    .student-card:active {
        transform: translateY(-1px);
        box-shadow: var(--shadow);
    }

    /* ===== 6. 按钮自适应宽度 ===== */
    .primary-btn, .secondary-btn {
        width: auto;
        display: inline-block;
        padding: 14px 32px;
    }
    .page .primary-btn,
    .page .secondary-btn {
        width: auto;
        min-width: 120px;
    }

    /* ===== 7. 弹窗居中且最大宽度640px ===== */
    .modal {
        align-items: center;
        padding: 40px 20px;
    }
    .modal-content {
        max-width: 640px;
        border-radius: var(--radius-lg);
        animation: modalFadeIn 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

    /* ===== 8. 文本输入框更高 ===== */
    #transcript {
        min-height: 280px;
        font-size: 1.05rem;
    }
    textarea.feedback-input,
    textarea {
        min-height: 280px;
    }

    /* ===== 9. 搜索栏更宽 ===== */
    .search-bar {
        max-width: 600px;
    }
    .search-bar input {
        font-size: 1rem;
    }

    /* ===== 10. 日期分组的 .history-date-label 横跨两列（已在上方第4项中实现） ===== */

    /* 电脑端优化：录音按钮缩小 */
    .record-btn {
        width: 120px;
        height: 120px;
    }
    .record-icon { font-size: 1.8rem; }
    .record-text { font-size: 0.9rem; }

    /* 电脑端优化：录音区域和输入区域并排 */
    .record-section {
        padding: 20px 0;
    }

    /* 电脑端优化：快捷回复区域更宽 */
    .quick-replies-content,
    .student-templates-content {
        max-height: 240px;
    }

    /* 电脑端：历史卡片悬停效果 */
    .history-item:hover {
        transform: translateY(-2px);
        box-shadow: var(--shadow-lg);
    }
}

/* ===== Hint Text ===== */
.hint-text {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 6px;
}

/* ===== Advanced Settings ===== */
.advanced-settings {
    margin-top: 12px;
}

.advanced-settings summary {
    color: var(--text-muted);
    font-size: 0.85rem;
    cursor: pointer;
    user-select: none;
    padding: 4px 0;
    list-style: none;
}

.advanced-settings summary::-webkit-details-marker {
    display: none;
}

.advanced-settings summary::before {
    content: '▸';
    margin-right: 6px;
    display: inline-block;
    transition: transform 0.2s;
}

.advanced-settings[open] summary::before {
    transform: rotate(90deg);
}

.advanced-content {
    margin-top: 10px;
    padding: 16px;
    background: var(--bg);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-light);
}

.advanced-content label {
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text-secondary);
    display: block;
}

.advanced-content input {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    background: var(--surface);
    transition: all 0.2s;
}

.advanced-content input:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 4px var(--primary-soft);
}

/* ===== Welcome Banner ===== */
.welcome-banner {
    background: var(--primary-gradient);
    border-radius: var(--radius);
    padding: 20px;
    color: white;
    margin-bottom: 20px;
    box-shadow: var(--shadow-lg);
}

.welcome-banner h2 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.welcome-banner p {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* ===== Quick Replies ===== */
.quick-replies-section,
.student-templates-section {
    margin-bottom: 16px;
    background: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--border-light);
    overflow: hidden;
}

.quick-replies-header,
.student-templates-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: var(--primary-soft);
    border-bottom: 1px solid var(--border-light);
}

.quick-replies-header label,
.student-templates-header label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--primary-dark);
}

.quick-replies-content,
.student-templates-content {
    padding: 12px 16px;
    max-height: 200px;
    overflow-y: auto;
    transition: max-height 0.3s ease;
}

.quick-replies-content.collapsed,
.student-templates-content.collapsed {
    max-height: 0;
    padding-top: 0;
    padding-bottom: 0;
    overflow: hidden;
}

.quick-reply-category {
    margin-bottom: 10px;
}

.quick-reply-category:last-child {
    margin-bottom: 0;
}

.quick-reply-cat-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    display: inline-block;
    padding: 2px 8px;
    background: var(--bg);
    border-radius: 4px;
    margin-bottom: 6px;
}

.quick-reply-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.quick-reply-tag {
    padding: 8px 14px;
    background: var(--bg);
    border: 1.5px solid var(--border);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 500;
    font-family: inherit;
    line-height: 1.4;
}

.quick-reply-tag:hover {
    border-color: var(--primary-light);
    background: var(--primary-soft);
    color: var(--primary);
    transform: translateY(-1px);
}

.student-template-tag {
    background: linear-gradient(135deg, rgba(99,102,241,0.05), rgba(139,92,246,0.05));
    border-color: rgba(99,102,241,0.2);
}

.student-template-tag:hover {
    background: var(--primary-soft);
    border-color: var(--primary-light);
}

/* ===== Quick Tips ===== */
.quick-tips {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 16px;
    border: 1px solid var(--border-light);
    margin-bottom: 20px;
}

.quick-tips h4 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text);
}

.quick-tips ul {
    list-style: none;
    padding: 0;
}

.quick-tips li {
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding: 4px 0;
    padding-left: 20px;
    position: relative;
}

.quick-tips li::before {
    content: '•';
    position: absolute;
    left: 6px;
    color: var(--primary);
    font-weight: 700;
}

/* ===== Copy Success Animation ===== */
.copy-success {
    animation: copyPulse 0.5s ease;
}

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

/* ===== Recording Timer ===== */
.recording-timer {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--danger);
    font-variant-numeric: tabular-nums;
    margin-top: 8px;
}

/* ===== Network Tip ===== */
.network-tip {
    display: flex;
    gap: 12px;
    padding: 16px;
    background: linear-gradient(135deg, #FEF3C7 0%, #FDE68A 100%);
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    border: 1px solid #FCD34D;
    animation: fadeIn 0.3s ease;
}

.network-tip .tip-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.network-tip .tip-content {
    flex: 1;
}

.network-tip .tip-title {
    font-weight: 700;
    font-size: 0.95rem;
    color: #92400E;
    margin-bottom: 4px;
}

.network-tip .tip-desc {
    font-size: 0.85rem;
    color: #B45309;
    line-height: 1.6;
}

/* ===== API Key Status ===== */
.api-key-status {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    padding: 4px 10px;
    border-radius: 20px;
    font-weight: 500;
    margin-top: 8px;
}

.api-key-status.valid {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
}

.api-key-status.invalid {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

/* ===== Style Options ===== */
.style-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.style-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 14px 10px;
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
    position: relative;
}

.style-option input {
    position: absolute;
    opacity: 0;
}

.style-option:hover {
    border-color: var(--primary-light);
    background: var(--primary-soft);
}

.style-option.active {
    border-color: var(--primary);
    background: var(--primary-soft);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.style-option .style-icon {
    font-size: 1.6rem;
}

.style-option .style-name {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text);
}

.style-option .style-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 1.4;
}

/* ===== Toggle Switch ===== */
.toggle-label {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    font-size: 0.95rem;
    color: var(--text);
    font-weight: 500;
}

.toggle-label input {
    display: none;
}

.toggle-switch {
    width: 44px;
    height: 24px;
    background: var(--border);
    border-radius: 12px;
    position: relative;
    transition: background 0.2s;
    flex-shrink: 0;
}

.toggle-switch::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    top: 2px;
    left: 2px;
    transition: transform 0.2s;
    box-shadow: 0 1px 3px rgba(0,0,0,0.15);
}

.toggle-label input:checked + .toggle-switch {
    background: var(--primary);
}

.toggle-label input:checked + .toggle-switch::after {
    transform: translateX(20px);
}

/* ===== Editable Feedback ===== */
.feedback-content {
    color: var(--text);
    line-height: 1.8;
    white-space: pre-wrap;
    font-size: 0.95rem;
    padding: 10px;
    border-radius: 8px;
    border: 1.5px solid transparent;
    transition: all 0.2s;
    min-height: 40px;
}

.feedback-content:hover {
    border-color: var(--border);
    background: rgba(255,255,255,0.5);
}

.feedback-content:focus {
    outline: none;
    border-color: var(--primary-light);
    background: var(--surface);
    box-shadow: 0 0 0 3px var(--primary-soft);
}

.feedback-edit-hint {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 6px;
    text-align: right;
}

/* ===== Enhanced Animations ===== */

/* Page transition */
.page {
    animation: pageEnter 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes pageEnter {
    from { opacity: 0; transform: translateY(16px) scale(0.98); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

/* Staggered list items */
.students-list .student-card {
    animation: slideInUp 0.4s ease backwards;
}

.students-list .student-card:nth-child(1) { animation-delay: 0.02s; }
.students-list .student-card:nth-child(2) { animation-delay: 0.04s; }
.students-list .student-card:nth-child(3) { animation-delay: 0.06s; }
.students-list .student-card:nth-child(4) { animation-delay: 0.08s; }
.students-list .student-card:nth-child(5) { animation-delay: 0.10s; }
.students-list .student-card:nth-child(6) { animation-delay: 0.12s; }
.students-list .student-card:nth-child(7) { animation-delay: 0.14s; }
.students-list .student-card:nth-child(8) { animation-delay: 0.16s; }
.students-list .student-card:nth-child(9) { animation-delay: 0.18s; }
.students-list .student-card:nth-child(10) { animation-delay: 0.20s; }

@keyframes slideInUp {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Subject cards stagger */
.subjects-grid .subject-card {
    animation: popIn 0.35s ease backwards;
}

.subjects-grid .subject-card:nth-child(1) { animation-delay: 0.03s; }
.subjects-grid .subject-card:nth-child(2) { animation-delay: 0.06s; }
.subjects-grid .subject-card:nth-child(3) { animation-delay: 0.09s; }
.subjects-grid .subject-card:nth-child(4) { animation-delay: 0.12s; }
.subjects-grid .subject-card:nth-child(5) { animation-delay: 0.15s; }
.subjects-grid .subject-card:nth-child(6) { animation-delay: 0.18s; }

@keyframes popIn {
    from { opacity: 0; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1); }
}

/* Record button pulse when not recording */
.record-btn:not(.recording) {
    animation: gentlePulse 3s ease-in-out infinite;
}

@keyframes gentlePulse {
    0%, 100% { box-shadow: var(--shadow-xl); }
    50% { box-shadow: 0 25px 50px -12px rgba(99, 102, 241, 0.4); }
}

/* Button press effect */
.primary-btn, .secondary-btn, .record-btn, .subject-card, .student-card {
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* FAB bounce on page load */
.fab-btn {
    animation: fabBounce 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes fabBounce {
    0% { transform: scale(0) rotate(-45deg); opacity: 0; }
    60% { transform: scale(1.1) rotate(5deg); }
    100% { transform: scale(1) rotate(0); opacity: 1; }
}

/* Toast slide in */
.toast {
    animation: toastSlide 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes toastSlide {
    from { transform: translateX(-50%) translateY(30px); opacity: 0; }
    to { transform: translateX(-50%) translateY(0); opacity: 1; }
}

/* Loading shimmer */
#loading-overlay {
    animation: fadeIn 0.2s ease;
}

.loading-spinner {
    animation: spin 0.8s linear infinite, fadeIn 0.3s ease;
}

/* Settings groups stagger */
.settings-group {
    animation: slideInUp 0.4s ease backwards;
}

.settings-group:nth-child(1) { animation-delay: 0.03s; }
.settings-group:nth-child(2) { animation-delay: 0.06s; }
.settings-group:nth-child(3) { animation-delay: 0.09s; }
.settings-group:nth-child(4) { animation-delay: 0.12s; }
.settings-group:nth-child(5) { animation-delay: 0.15s; }
.settings-group:nth-child(6) { animation-delay: 0.18s; }

/* History items stagger */
.history-list .history-item {
    animation: slideInUp 0.35s ease backwards;
}

.history-list .history-item:nth-child(1) { animation-delay: 0.02s; }
.history-list .history-item:nth-child(2) { animation-delay: 0.04s; }
.history-list .history-item:nth-child(3) { animation-delay: 0.06s; }
.history-list .history-item:nth-child(4) { animation-delay: 0.08s; }
.history-list .history-item:nth-child(5) { animation-delay: 0.10s; }

/* Quick reply tags hover */
.quick-reply-tag {
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.quick-reply-tag:active {
    transform: scale(0.95);
}

/* Modal backdrop fade */
.modal {
    animation: backdropFade 0.2s ease;
}

@keyframes backdropFade {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Search bar focus glow */
.search-bar {
    transition: all 0.25s ease;
}

.search-bar:focus-within {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.12);
}

/* Class timer section */
.class-timer-section {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
    margin-bottom: 20px;
    border: 2px solid var(--border);
    box-shadow: var(--shadow-sm);
    animation: slideInUp 0.4s ease;
}

.class-timer-display {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    font-variant-numeric: tabular-nums;
    letter-spacing: 2px;
    line-height: 1;
    margin-bottom: 4px;
}

.class-timer-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.class-timer-controls {
    display: flex;
    gap: 8px;
    justify-content: center;
}

.timer-btn {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    border: 1.5px solid var(--border);
    background: var(--surface);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
}

.timer-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.timer-start {
    border-color: var(--success);
    color: var(--success);
    background: rgba(16, 185, 129, 0.05);
}

.timer-start:hover {
    background: rgba(16, 185, 129, 0.1);
}

.timer-pause {
    border-color: var(--warning);
    color: var(--warning);
    background: rgba(245, 158, 11, 0.05);
}

.timer-pause:hover {
    background: rgba(245, 158, 11, 0.1);
}

.timer-stop {
    border-color: var(--danger);
    color: var(--danger);
    background: rgba(239, 68, 68, 0.05);
}

.timer-stop:hover {
    background: rgba(239, 68, 68, 0.1);
}

/* Bottom nav item hover */
.bottom-nav-item {
    transition: all 0.2s ease;
}

.bottom-nav-item:hover {
    color: var(--primary-light);
}

.bottom-nav-item:hover .nav-icon {
    transform: translateY(-2px);
}

/* Sidebar nav item hover */
.sidebar-nav-item {
    position: relative;
    overflow: hidden;
}

.sidebar-nav-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 0;
    background: var(--primary);
    border-radius: 0 2px 2px 0;
    transition: height 0.25s ease;
}

.sidebar-nav-item:hover::before,
.sidebar-nav-item.active::before {
    height: 60%;
}

/* Welcome banner animation */
.welcome-banner {
    animation: bannerSlide 0.5s ease;
}

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

/* Network tip shake on show */
.network-tip {
    animation: tipShake 0.5s ease;
}

@keyframes tipShake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-4px); }
    40% { transform: translateX(4px); }
    60% { transform: translateX(-2px); }
    80% { transform: translateX(2px); }
}

/* Style option checkmark animation */
.style-option.active {
    animation: selectPop 0.3s ease;
}

@keyframes selectPop {
    0% { transform: scale(1); }
    50% { transform: scale(1.03); }
    100% { transform: scale(1); }
}

/* Theme option hover glow */
.theme-option {
    transition: all 0.25s ease;
}

.theme-option:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

/* Manage item hover */
.manage-item {
    transition: background 0.2s ease;
}

.manage-item:hover {
    background: var(--bg);
    border-radius: 8px;
}

/* Feedback section entrance */
.feedback-section {
    animation: slideInUp 0.35s ease backwards;
}

.feedback-section:nth-child(1) { animation-delay: 0.05s; }
.feedback-section:nth-child(2) { animation-delay: 0.10s; }
.feedback-section:nth-child(3) { animation-delay: 0.15s; }
.feedback-section:nth-child(4) { animation-delay: 0.20s; }

/* Input focus ring animation */
input:focus, textarea:focus, select:focus {
    transition: all 0.2s ease;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ===== Speech Recognition Settings ===== */
.speech-provider-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.speech-config-field {
    margin-top: 10px;
}

.speech-config-field label {
    font-size: 0.85rem;
    color: var(--text-muted);
    display: block;
    margin-bottom: 4px;
}

.speech-config-field input {
    width: 100%;
    padding: 10px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    background: var(--surface);
    color: var(--text);
    transition: all 0.2s;
}

.speech-config-field input:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 4px var(--primary-soft);
}

.speech-engine-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.75rem;
    background: var(--primary-soft);
    color: var(--primary);
    margin-left: 8px;
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}