/* 
 * Lixor Web App Styles
 * Real-time translation and lecture summarization platform
 * 
 * CSS Organization:
 * 1. CSS Variables & Root
 * 2. Base Styles & Reset
 * 3. Layout Components
 * 4. UI Components
 * 5. Interactive Elements
 * 6. Modals & Overlays
 * 7. Responsive Design
 * 8. Utility Classes
 */

/* ========================================
   1. CSS VARIABLES & ROOT
   ======================================== */
:root {
    /* Color Palette */
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #4b5563;
    --secondary-dark: #374151;
    --accent-color: #3b82f6;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    
    /* Background Colors */
    --light-bg: #f3f4f6;
    --dark-bg: #1f2937;
    
    /* Text Colors */
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-light: #f9fafb;
    
    /* Border & UI Colors */
    --border-color: #e5e7eb;
    --bubble-original: #e3f2fd;
    --bubble-translated: #e8f5e9;
    --bubble-student: #fff3e0;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    
    /* Transitions */
    --transition: all 0.3s ease;
    
    /* Font Settings */
    --main-font-size: 1rem;
    --main-font-family: inherit;

    /* Profile / login dark theme (shared with profile selection UI) */
    --profile-screen-bg: #141414;
    --profile-surface: #1f1f1f;
    --profile-input-bg: #2a2a2a;
    --profile-input-border: #444;
    --profile-text-muted: #b3b3b3;
    --profile-label: #aaa;
    --profile-divider: #333;
    --profile-card-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
}

/* ========================================
   2. BASE STYLES & RESET
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--text-primary);
    background-color: var(--light-bg);
    min-height: 100vh;
    line-height: 1.5;
}

/* ========================================
   3. LAYOUT COMPONENTS
   ======================================== */

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 1440px;
    margin: 0 auto;
    background-color: white;
    box-shadow: var(--shadow-lg);
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background-color: white;
    box-shadow: var(--shadow-sm);
    border-bottom: 1px solid var(--border-color);
    min-height: 80px;
}

.header-left {
    flex: 0 0 auto;
}

.header-center {
    flex: 1;
    display: flex;
    justify-content: center;
}

.header-right {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* 세션 종료 버튼을 헤더 상단에 맞춤 */
.header-right-session-actions {
    align-self: flex-start;
    padding-top: 0;
    margin-top: 0;
}

/* Translation Toggle Icon (Header) */
.translation-toggle-icon {
    display: flex;
    align-items: center;
}

.translation-toggle-label-icon {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    background: transparent;
    border: 2px solid var(--border-color);
}

.translation-toggle-label-icon:hover {
    background-color: var(--light-bg);
    border-color: var(--primary-color);
}

.translation-toggle-label-icon input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.translation-toggle-label-icon i {
    font-size: 1.25rem;
    color: #94a3b8;
    transition: all 0.3s ease;
}

/* Off state (default) - gray border, gray icon */
.translation-toggle-label-icon:not(:has(input:checked)) {
    background: transparent;
    border-color: var(--border-color);
}

.translation-toggle-label-icon:not(:has(input:checked)) i {
    color: #94a3b8;
}

.translation-toggle-label-icon:not(:has(input:checked)):hover i {
    color: var(--primary-color);
}

/* On state (checked) - primary color background, white icon */
.translation-toggle-label-icon:has(input:checked) {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.translation-toggle-label-icon:has(input:checked) i {
    color: white;
}

.translation-toggle-label-icon:has(input:checked):hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
}

.translation-toggle-label-icon:has(input:checked):hover i {
    color: white;
}

.logo {
    display: flex;
    flex-direction: column;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-container.logo-only {
    gap: 0;
}

.university-logo {
    height: 50px;
    width: auto;
    max-width: 200px;
    object-fit: contain;
    border-radius: var(--radius-sm);
    transition: opacity 0.3s ease;
}

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

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
}

.tagline {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Tab Navigation */
.tab-navigation {
    display: flex;
    gap: 0.5rem;
    background-color: #f8fafc;
    padding: 0.25rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.tab-button {
    background: transparent;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tab-button:hover {
    background-color: white;
    color: var(--text-primary);
}

.tab-button.active {
    background-color: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-sm);
}

.tab-button i {
    font-size: 0.875rem;
}

/* Logout Button */
.logout-button {
    background-color: var(--danger-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logout-button:hover {
    background-color: #dc2626;
    transform: translateY(-1px);
}

/* Main Content Layout */
.main-content {
    display: flex;
    flex: 1;
    height: calc(100vh - 80px);
    flex-direction: column;
    background-color: #f8fafc;
}

@media (max-width: 992px) {
    .main-content {
        height: calc(100vh - 60px);
    }
}

/* Login View (matches profile selection dark theme) */
.login-view {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    width: 100%;
    min-height: 0;
    background: var(--profile-screen-bg);
}

.login-container {
    max-width: 500px;
    width: 100%;
    background: var(--profile-surface);
    border-radius: 12px;
    box-shadow: var(--profile-card-shadow);
    padding: 3rem;
    text-align: center;
}

.login-header {
    margin-bottom: 2rem;
}

.login-header h2 {
    font-size: 2rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: 0.5rem;
}

.login-header p {
    color: var(--profile-text-muted);
    font-size: 1rem;
}

.login-form-container {
    margin-bottom: 2rem;
}

.login-form {
    text-align: left;
    margin-bottom: 1.5rem;
}

/* Override global .form-group card styles — login uses flat fields like .pf-field */
.login-form .form-group {
    margin-bottom: 1.25rem;
    background: transparent;
    padding: 0;
    border: none;
    border-radius: 0;
    transition: none;
}

.login-form .form-group:hover {
    background: transparent;
    border-color: transparent;
    transform: none;
    box-shadow: none;
}

.login-form .form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    font-size: 0.85rem;
    color: var(--profile-label);
}

.login-form .form-group label::before {
    display: none;
    content: none;
}

.login-form .form-group input {
    width: 100%;
    padding: 0.65rem 0.75rem;
    border: 1px solid var(--profile-input-border);
    border-radius: 6px;
    background: var(--profile-input-bg);
    color: #fff;
    font-size: 1rem;
    font-weight: 400;
    cursor: text;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
    transform: none;
}

.login-form .form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
    transform: none;
}

.login-form .form-group input:hover {
    border-color: var(--profile-input-border);
}

.login-form .form-group input:hover:focus {
    border-color: var(--primary-color);
}

.login-submit {
    width: 100%;
    padding: 0.875rem;
    font-size: 1rem;
    font-weight: 600;
}

/* Login options removed */

.demo-section {
    border-top: 1px solid var(--profile-divider);
    padding-top: 2rem;
}

.demo-section h3 {
    margin-bottom: 1rem;
    color: var(--profile-text-muted);
    font-size: 1.125rem;
}

.demo-button-large {
    background: transparent;
    color: #fff;
    border: 2px solid #555;
    padding: 1.5rem 2rem;
    border-radius: 6px;
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease, transform 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    box-shadow: none;
}

.demo-button-large:hover {
    transform: translateY(-2px);
    background: #333;
    border-color: #fff;
    box-shadow: none;
}

.demo-button-large i {
    font-size: 1.5rem;
}

.demo-button-large small {
    font-size: 0.875rem;
    opacity: 0.9;
    font-weight: 400;
}

/* ===== Profile Selection View (Netflix-style) ===== */
.profile-view {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--profile-screen-bg);
    padding: 2rem;
    position: relative;
}

.profile-container {
    text-align: center;
    max-width: 720px;
    width: 100%;
}

.profile-title {
    color: #fff;
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 2rem;
}

.profile-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
}

.profile-card {
    width: 120px;
    cursor: pointer;
    text-align: center;
    transition: transform 0.15s ease;
}

.profile-card:hover {
    transform: scale(1.08);
}

.profile-card:hover .profile-avatar {
    outline: 3px solid #fff;
}

.profile-avatar {
    width: 100px;
    height: 100px;
    border-radius: 12px;
    margin: 0 auto 0.6rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.4rem;
    font-weight: 700;
    color: #fff;
    outline: 3px solid transparent;
    transition: outline-color 0.15s ease;
}

.profile-card-name {
    color: #b3b3b3;
    font-size: 0.9rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.profile-card:hover .profile-card-name {
    color: #fff;
}

.profile-card-major {
    color: #666;
    font-size: 0.75rem;
    margin-top: 2px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* "Add profile" card */
.profile-card--add .profile-avatar {
    background: transparent;
    border: 3px dashed #555;
    font-size: 2.2rem;
    color: #888;
}

.profile-card--add:hover .profile-avatar {
    border-color: #fff;
    color: #fff;
    outline: none;
}

/* Delete button on profile card */
.profile-card-delete {
    background: none;
    border: none;
    color: #666;
    font-size: 0.75rem;
    cursor: pointer;
    margin-top: 4px;
    padding: 2px 6px;
    border-radius: 4px;
    transition: color 0.15s, background 0.15s;
}

.profile-card-delete:hover {
    color: #e50914;
    background: rgba(229, 9, 20, 0.15);
}

/* Profile creation form overlay */
.profile-form-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.profile-form-card {
    background: var(--profile-surface);
    border-radius: 12px;
    padding: 2rem 2.5rem;
    width: 360px;
    max-width: 90vw;
    box-shadow: var(--profile-card-shadow);
}

.profile-form-card h3 {
    color: #fff;
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
}

.pf-field {
    margin-bottom: 1.25rem;
    text-align: left;
}

.pf-field label {
    display: block;
    color: var(--profile-label);
    font-size: 0.85rem;
    margin-bottom: 0.4rem;
}

.pf-field input {
    width: 100%;
    padding: 0.65rem 0.75rem;
    border: 1px solid var(--profile-input-border);
    border-radius: 6px;
    background: var(--profile-input-bg);
    color: #fff;
    font-size: 0.95rem;
    transition: border-color 0.15s;
}

.pf-field input:focus {
    outline: none;
    border-color: var(--primary-color, #2563eb);
}

.pf-buttons {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.pf-cancel {
    flex: 1;
    padding: 0.6rem;
    border: 1px solid #555;
    border-radius: 6px;
    background: transparent;
    color: #ccc;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background 0.15s;
}

.pf-cancel:hover {
    background: #333;
}

.pf-submit {
    flex: 1;
    padding: 0.6rem;
    border: none;
    border-radius: 6px;
    background: var(--primary-color, #2563eb);
    color: #fff;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: filter 0.15s;
}

.pf-submit:hover {
    filter: brightness(1.15);
}

/* Avatar palette — 8 distinct colours */
.profile-avatar--0 { background: #e50914; }
.profile-avatar--1 { background: #0071eb; }
.profile-avatar--2 { background: #46d369; }
.profile-avatar--3 { background: #f5a623; }
.profile-avatar--4 { background: #b9090b; }
.profile-avatar--5 { background: #6b5ce7; }
.profile-avatar--6 { background: #00c8d8; }
.profile-avatar--7 { background: #ff6f91; }

/* Tab Content */
.tab-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.tab-panel {
    display: none;
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
}

.tab-panel.active {
    display: flex;
    flex-direction: column;
}

/* Session Tab */
.session-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    height: 100%;
}

#session-tab.tab-panel.active {
    padding-bottom: 9rem;
}

/* Session tab: fixed microphone status (above floating control bar) */
.session-mic-status-bar {
    position: fixed;
    left: 50%;
    transform: translateX(-50%);
    width: min(1200px, calc(100% - 24px));
    z-index: 998;
    bottom: 16px;
    padding: 0.5rem 0.85rem 0.55rem;
    background: rgba(248, 250, 252, 0.98);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.session-mic-status-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-width: 0;
}

.session-mic-icon {
    color: var(--primary-color);
    flex-shrink: 0;
}

.mic-status-text {
    flex: 1;
    min-width: 0;
    line-height: 1.35;
}

.mic-status-refresh-btn {
    flex-shrink: 0;
    border: none;
    background: transparent;
    cursor: pointer;
    color: var(--primary-color);
    font-size: 1.05rem;
    line-height: 1;
    padding: 0.2rem 0.4rem;
    border-radius: 6px;
}

.mic-status-refresh-btn:hover {
    background: var(--light-bg);
}

.mic-level-meter-track {
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    margin-top: 0.4rem;
    overflow: hidden;
}

.mic-level-meter-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--success-color), var(--primary-color));
    border-radius: 2px;
}

.mic-status-os-hint {
    margin: 0.35rem 0 0;
    font-size: 0.72rem;
    color: var(--text-secondary);
    line-height: 1.35;
}

/* Session Control Bar - Modern Production Design */
.session-control-bar {
    position: fixed;
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
    width: min(1200px, calc(100% - 24px));
    height: 64px;
    background: rgba(255, 255, 255, 0.96);
    border: 1px solid rgba(229, 231, 235, 0.9);
    box-shadow: 0 12px 30px rgba(17, 24, 39, 0.12);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    z-index: 1000;
    gap: 1.5rem;
    border-radius: 16px;
    backdrop-filter: blur(10px);
}

.control-bar-left {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 1rem;
    min-width: 0;
    overflow: hidden;
    justify-content: flex-start;
}

.control-bar-right {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-width: 0;
    flex-shrink: 0;
    justify-content: flex-end;
    height: 100%;
    margin: 0;
    padding: 0;
    align-content: center;
}

.session-info-compact {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: transparent;
    padding: 0;
    border-radius: 0;
    border: none;
    backdrop-filter: none;
    max-width: none;
    flex-shrink: 1;
    min-width: 0;
}

.session-title-compact {
    font-weight: 600;
    color: var(--text-primary);
    max-width: 180px;
    font-size: 0.85rem;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex-shrink: 1;
    letter-spacing: 0.1px;
}

.session-code-compact {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
    background: #f1f5f9;
    padding: 0.35rem 0.6rem;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    letter-spacing: 0.2px;
    flex-shrink: 0;
}

.session-code-compact span[data-i18n] {
    color: var(--text-secondary);
    font-weight: 400;
}

.session-timer-compact {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
    background: #f1f5f9;
    padding: 0.35rem 0.6rem;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    letter-spacing: 0.2px;
    flex-shrink: 0;
}

.session-timer-compact span[data-i18n] {
    color: var(--text-secondary);
    font-weight: 400;
}

/* QR Display - Clean & Minimal */
.qr-display-compact {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: white;
    box-shadow: 0 1px 2px rgba(17, 24, 39, 0.06);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
    cursor: pointer;
}

.qr-display-compact:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 20px rgba(17, 24, 39, 0.12);
}

.qr-display-compact img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 4px;
}

/* Recording Controls Container */
.recording-controls-compact {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
    height: 100%;
    margin: 0;
    padding: 0;
    background: transparent;
    border-radius: 0;
    border: none;
}

/* Record Toggle Button (Primary action) */
.record-toggle-button {
    height: 40px;
    padding: 0 14px;
    border-radius: 999px;
    border: 1px solid transparent;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    line-height: 1;
    transition: all 0.2s ease;
    user-select: none;
    white-space: nowrap;
}

.record-toggle-button i {
    font-size: 0.95rem;
}

.record-toggle-start {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 1px 2px rgba(17, 24, 39, 0.08);
}

.record-toggle-start:hover:not(:disabled) {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 10px 20px rgba(37, 99, 235, 0.18);
}

.record-toggle-stop {
    background: var(--danger-color);
    color: white;
    box-shadow: 0 1px 2px rgba(17, 24, 39, 0.08);
}

.record-toggle-stop:hover:not(:disabled) {
    background: #dc2626;
    transform: translateY(-1px);
    box-shadow: 0 10px 20px rgba(239, 68, 68, 0.18);
}

.record-toggle-button:active:not(:disabled) {
    transform: translateY(0);
}

.record-toggle-button:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.record-toggle-button:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.18);
}

/* End Session Button - Text Only Style */
.end-session-compact {
    background: transparent !important;
    color: var(--danger-color) !important;
    border: 1px solid rgba(239, 68, 68, 0.35) !important;
    padding: 0 0.75rem !important;
    border-radius: 999px !important;
    font-size: 0.8rem !important;
    font-weight: 600 !important;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    height: 38px;
    margin: 0 !important;
    letter-spacing: 0.2px;
}

/* Hide icon, show only text */
.end-session-compact i {
    display: none !important;
}

.end-session-compact span {
    display: inline !important;
}

.end-session-compact:hover {
    background: rgba(239, 68, 68, 0.08) !important;
    border-color: rgba(239, 68, 68, 0.5) !important;
    transform: translateY(-1px);
    box-shadow: 0 10px 20px rgba(239, 68, 68, 0.10);
}

.end-session-compact:active {
    transform: translateY(0);
}

/* Questions Lock Button - Modern Toggle Design */
.lock-questions-button {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    cursor: pointer;
    display: flex !important;
    visibility: visible !important;
    opacity: 1 !important;
    align-items: center;
    justify-content: center;
    background: white;
    color: var(--text-secondary);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    margin-right: 0;
    font-size: 1rem;
    z-index: 10;
    flex-shrink: 0;
}

/* Icon wrapper for smooth transitions */
.lock-questions-button .lock-icon-wrapper {
    position: relative;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Open state icon (comment dots) */
.lock-questions-button .lock-icon-open {
    position: absolute;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 1;
    transform: scale(1) rotate(0deg);
}

/* Closed state icon (comment slash) */
.lock-questions-button .lock-icon-closed {
    position: absolute;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
    transform: scale(0.5) rotate(-90deg);
}

/* Status indicator dot */
.lock-questions-button .lock-status-dot {
    position: absolute;
    bottom: 4px;
    right: 4px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #16a34a;
    box-shadow: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Hover state - Open */
.lock-questions-button:hover:not(:disabled) {
    background: #f8fafc;
    border-color: rgba(37, 99, 235, 0.35);
    transform: translateY(-1px);
    box-shadow: 0 10px 20px rgba(17, 24, 39, 0.10);
}

/* ===== LOCKED STATE ===== */
.lock-questions-button.locked {
    background: white;
    border-color: rgba(239, 68, 68, 0.35);
    color: var(--danger-color);
}

/* Switch icons on locked state */
.lock-questions-button.locked .lock-icon-open {
    opacity: 0;
    transform: scale(0.5) rotate(90deg);
}

.lock-questions-button.locked .lock-icon-closed {
    opacity: 1;
    transform: scale(1) rotate(0deg);
}

/* Status dot - locked (red) */
.lock-questions-button.locked .lock-status-dot {
    background: #ef4444;
    box-shadow: none;
}

/* Hover state - Locked */
.lock-questions-button.locked:hover:not(:disabled) {
    background: rgba(239, 68, 68, 0.06);
    border-color: rgba(239, 68, 68, 0.55);
    transform: translateY(-1px);
    box-shadow: 0 10px 20px rgba(239, 68, 68, 0.10);
}

/* Disabled state */
.lock-questions-button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

/* Click animation */
.lock-questions-button:active:not(:disabled) {
    transform: scale(0.95);
}

.session-creation-area {
    background: white;
    border-radius: var(--radius-md);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    text-align: center;
}

.creation-header {
    margin-bottom: 2rem;
}

.creation-header h2 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.creation-header p {
    color: var(--text-secondary);
    font-size: 1rem;
}

.create-session-button {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 1.25rem 1.75rem;
    border-radius: 16px;
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 10px 24px rgba(37, 99, 235, 0.18);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    max-width: 400px;
    margin: 0 auto;
}

.create-session-button:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 14px 30px rgba(37, 99, 235, 0.22);
}

.create-session-button i {
    font-size: 1.4rem;
}

.button-text {
    font-size: 1.125rem;
    font-weight: 600;
}


/* Account Tab */
.account-container {
    flex: 1;
}

/* Logout button in account tab */
.logout-button-account {
    width: 100%;
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    box-shadow: 0 2px 4px rgba(239, 68, 68, 0.2);
}

.logout-button-account:hover {
    background: linear-gradient(135deg, #dc2626, #b91c1c);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(239, 68, 68, 0.3);
}

.logout-button-account:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(239, 68, 68, 0.2);
}

.logout-button-account i {
    font-size: 1rem;
}

.account-header {
    margin-bottom: 2rem;
}

.account-header h2 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.account-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.account-card {
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.card-header {
    background: #f8fafc;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.card-header i {
    color: var(--primary-color);
    font-size: 1.125rem;
}

.card-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.card-content {
    padding: 1.5rem;
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid #e2e8f0;
    background: white;
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
    transition: all 0.3s ease;
}

.info-item:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.info-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.info-item label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.info-item span {
    color: var(--text-secondary);
    font-weight: 500;
    background: #f1f5f9;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
}

.tier-badge {
    background: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
}

.toggle-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
}

.toggle-item label {
    font-weight: 500;
    color: var(--text-primary);
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
}

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

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--primary-color);
}

input:checked + .slider:before {
    transform: translateX(26px);
}

.link-item {
    padding: 0.75rem 0;
    border-bottom: 1px solid #f1f5f9;
}

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

.link-item a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.link-item a:hover {
    color: var(--primary-dark);
}

/* Settings Tab */
.settings-container {
    flex: 1;
    display: flex;
    gap: 2rem;
    min-height: 600px;
}

.settings-sidebar {
    width: 280px;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    padding: 0;
    overflow: hidden;
}

.settings-menu {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.settings-menu-item {
    background: transparent;
    border: none;
    padding: 1rem 1.5rem;
    border-radius: 0;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 1rem;
    text-align: left;
    justify-content: flex-start;
    width: 100%;
    border-bottom: 1px solid #f1f5f9;
    position: relative;
}

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

.settings-menu-item:hover {
    background-color: #f8fafc;
    color: var(--text-primary);
    transform: translateX(2px);
}

.settings-menu-item.active {
    background: linear-gradient(135deg, var(--primary-color), #3b82f6);
    color: white;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

.settings-menu-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: white;
    border-radius: 0 2px 2px 0;
}

.settings-menu-item i {
    font-size: 1.1rem;
    width: 20px;
    opacity: 0.8;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    flex-shrink: 0;
    margin-left: 0;
}

.settings-menu-item.active i {
    opacity: 1;
}

.settings-content {
    flex: 1;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    padding: 2.5rem;
    overflow-y: auto;
}

.settings-panel {
    display: none;
    animation: fadeInUp 0.3s ease;
}

.settings-panel.active {
    display: block;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.settings-panel h3 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2rem;
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 0.75rem;
    position: relative;
}

.settings-panel h3::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), #3b82f6);
    border-radius: 2px;
}

.settings-group {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* New Translation Language Addition Section */
.settings-group h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

.preset-language-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.preset-lang-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
}

.preset-lang-btn:hover {
    border-color: var(--primary-color);
    background: #f8fafc;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.preset-lang-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.preset-lang-btn .flag {
    font-size: 1.5rem;
    line-height: 1;
}

.preset-lang-btn .lang-name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.custom-language-selector {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.custom-language-selector select {
    flex: 1;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    background: white;
    transition: all 0.2s ease;
}

.custom-language-selector select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Font Settings Styles */
.font-size-control {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: 0.5rem;
}

.font-size-control input[type="range"] {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: #e2e8f0;
    outline: none;
    -webkit-appearance: none;
}

.font-size-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.font-size-control input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.font-size-value {
    min-width: 60px;
    text-align: center;
    font-weight: 600;
    color: var(--primary-color);
    background: #f1f5f9;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
}

.font-preview {
    margin-top: 1rem;
    padding: 1rem;
    background: #f8fafc;
    border-radius: var(--radius-md);
    border: 2px solid var(--border-color);
}

.preview-text {
    font-size: 1.2rem;
    font-weight: 600;
    color: #1a1a1a;
    line-height: 1.5;
    transition: all 0.3s ease;
}

.secondary-button {
    background: #6b7280;
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.secondary-button:hover {
    background: #4b5563;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.secondary-button:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

/* Font Family Options */
.font-family-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

.font-family-option:hover {
    background: #f1f5f9;
}

.font-family-option input[type="radio"] {
    margin: 0;
}

.font-family-option label {
    cursor: pointer;
    font-weight: 500;
    color: var(--text-primary);
}

/* Responsive font settings */
@media (max-width: 768px) {
    .font-size-control {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }
    
    .font-size-value {
        text-align: center;
    }
}
    color: var(--text-primary);
    transition: border-color 0.2s ease;
}

.custom-language-selector select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.add-lang-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 1.25rem;
}

.add-lang-btn:hover:not(:disabled) {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.add-lang-btn:disabled {
    background: var(--secondary-color);
    cursor: not-allowed;
    opacity: 0.6;
}

.add-lang-btn:active:not(:disabled) {
    transform: translateY(0);
}

/* Responsive design for language addition section */
@media (max-width: 768px) {
    .preset-language-buttons {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }
    
    .preset-lang-btn {
        padding: 0.75rem 0.5rem;
    }
    
    .preset-lang-btn .flag {
        font-size: 1.25rem;
    }
    
    .preset-lang-btn .lang-name {
        font-size: 0.75rem;
    }
    
    .custom-language-selector {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .add-lang-btn {
        width: 100%;
        height: 44px;
    }
}

@media (max-width: 480px) {
    .preset-language-buttons {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }
    
    .preset-lang-btn {
        padding: 0.5rem 0.25rem;
    }
    
    .preset-lang-btn .flag {
        font-size: 1rem;
    }
    
    .preset-lang-btn .lang-name {
        font-size: 0.7rem;
    }
}

.support-item {
    margin-bottom: 1.5rem;
}

.support-button {
    background: linear-gradient(135deg, #f8fafc, #f1f5f9);
    color: var(--text-primary);
    border: 2px solid #e2e8f0;
    padding: 1.25rem 1.5rem;
    border-radius: var(--radius-lg);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 1rem;
    width: 100%;
    text-align: left;
    position: relative;
    overflow: hidden;
}

.support-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left 0.5s ease;
}

.support-button:hover::before {
    left: 100%;
}

.support-button:hover {
    background: linear-gradient(135deg, var(--primary-color), #3b82f6);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.3);
    border-color: var(--primary-color);
}

.support-button i {
    font-size: 1.1rem;
    opacity: 0.8;
}

.support-button:hover i {
    opacity: 1;
}

/* Secondary Button for Settings */
.secondary-button {
    background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
    color: var(--text-primary);
    border: 2px solid #cbd5e1;
    padding: 0.875rem 1.5rem;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    margin-top: 1rem;
}

.secondary-button:hover {
    background: linear-gradient(135deg, var(--primary-color), #3b82f6);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
}

.secondary-button i {
    font-size: 1rem;
}

/* Dashboard View */
.dashboard-view {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    padding: 2rem;
}

.dashboard-container {
    max-width: 800px;
    width: 100%;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 3rem;
    text-align: center;
}

.dashboard-header {
    margin-bottom: 3rem;
}

.dashboard-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.dashboard-header p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin: 0;
}

.dashboard-actions {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Primary Action - Create Session */
.primary-action {
    margin-bottom: 1rem;
}

.create-session-button {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    padding: 2rem 3rem;
    border-radius: var(--radius-lg);
    font-size: 1.25rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.3);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
}

.create-session-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(37, 99, 235, 0.4);
}

.create-session-button i {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.button-text {
    font-size: 1.25rem;
    font-weight: 600;
}


/* Quick Tools */
.quick-tools {
    text-align: left;
}

.quick-tools h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    text-align: center;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.tool-button {
    background: white;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.tool-button:hover {
    border-color: var(--primary-color);
    background-color: #f8fafc;
    transform: translateY(-1px);
}

.tool-button i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

/* Account Section */
.account-section {
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
}

/* Session View */
.session-view {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: white;
}

.session-header {
    background: white;
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
}

.session-info h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 0.5rem 0;
}

.session-meta {
    display: flex;
    gap: 2rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.session-code, .session-timer {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.session-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.qr-button {
    background: var(--success-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.qr-button:hover {
    background: #0da271;
    transform: translateY(-1px);
}

.minimize-button {
    background: var(--secondary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.minimize-button:hover {
    background: var(--secondary-dark);
    transform: translateY(-1px);
}

/* Session Settings Panel */
.session-settings-panel {
    background: #f8fafc;
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem 2rem;
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.setting-group {
    background: white;
    padding: 1.5rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.setting-group h4 {
    font-size: 1rem;
    font-weight: 600;
}

/* 음성인식 훈련 섹션 스타일 */
#voice-training-section {
    margin-top: 2rem;
    border-top: 2px solid var(--border-color);
    padding-top: 2rem;
}

#voice-training-section h4 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.training-controls {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.dictionary-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.dictionary-list {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.dictionary-header {
    background: var(--background-light);
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.dictionary-header h5 {
    margin: 0;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
}

.dictionary-search {
    position: relative;
    display: flex;
    align-items: center;
}

.dictionary-search input {
    padding: 0.5rem 2rem 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    width: 200px;
}

.dictionary-search i {
    position: absolute;
    right: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.dictionary-items {
    max-height: 400px;
    overflow-y: auto;
}

.dictionary-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1.5rem;
    border-bottom: 1px solid var(--border-light);
    transition: background-color 0.2s ease;
}

.dictionary-item:hover {
    background: var(--background-light);
}

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

.dictionary-term {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex: 1;
}

.dictionary-term-text {
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.dictionary-term-arrow {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.dictionary-term-corrected {
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    color: var(--success-color);
    font-weight: 500;
}

.dictionary-term-category {
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: var(--background-light);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    margin-left: 0.5rem;
}

.dictionary-item-actions {
    display: flex;
    gap: 0.5rem;
}

.dictionary-item-actions button {
    padding: 0.25rem 0.5rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.edit-term-btn {
    background: var(--warning-color);
    color: white;
}

.edit-term-btn:hover {
    background: #d97706;
}

.delete-term-btn {
    background: var(--error-color);
    color: white;
}

.delete-term-btn:hover {
    background: #dc2626;
}

.dictionary-empty {
    padding: 2rem;
    text-align: center;
    color: var(--text-secondary);
    font-style: italic;
}

/* 용어 추가/편집 모달 */
.term-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.term-modal.show {
    display: flex;
}

.term-modal-content {
    background: white;
    padding: 2rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    width: 90%;
    max-width: 500px;
}

.term-modal h3 {
    margin: 0 0 1.5rem 0;
    color: var(--text-primary);
}

.term-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.term-form .form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.term-form label {
    font-weight: 500;
    color: var(--text-primary);
}

.term-form input {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
}

.term-form-actions {
    display: flex;
    gap: 0.75rem;
    justify-content: flex-end;
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.term-form-actions button {
    padding: 0.75rem 1.75rem;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 80px;
    position: relative;
    overflow: hidden;
}

.term-form-actions button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.term-form-actions button:hover::before {
    left: 100%;
}

.term-form-actions .cancel-btn {
    background: #f8f9fa;
    color: #6c757d;
    border: 1px solid #dee2e6;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.term-form-actions .cancel-btn:hover {
    background: #e9ecef;
    color: #495057;
    border-color: #adb5bd;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.term-form-actions .save-btn {
    background: linear-gradient(135deg, var(--primary-color), #4f46e5);
    color: white;
    box-shadow: 0 2px 4px rgba(79, 70, 229, 0.3);
}

.term-form-actions .save-btn:hover {
    background: linear-gradient(135deg, var(--primary-dark), #3730a3);
    transform: translateY(-1px);
    box-shadow: 0 6px 12px rgba(79, 70, 229, 0.4);
}

.term-form-actions .save-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(79, 70, 229, 0.3);
}

.setting-group h4 i {
    color: var(--primary-color);
}

/* QR Modal */
.qr-modal-content {
    text-align: center;
    max-width: 400px;
}

.qr-instructions {
    margin-top: 1rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Mobile QR Button */
.mobile-qr-button {
    background: transparent;
    border: none;
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 1.25rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
}

.mobile-qr-button:hover {
    background-color: var(--light-bg);
    color: var(--primary-color);
}

.mobile-qr-button i {
    font-size: 1.25rem;
}

/* Mobile QR Display */
.mobile-qr-display {
    width: 200px;
    height: 200px;
    background-color: #f8f9fa;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    position: relative;
    overflow: hidden;
}

.mobile-qr-display .qr-image {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    border-radius: var(--radius-sm);
}

/* Sidebar (Legacy - keeping for compatibility) */
.sidebar {
    width: 300px;
    background-color: white;
    border-right: 1px solid var(--border-color);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    overflow-y: auto;
    position: relative;
    transition: width 0.3s ease;
}

/* Sidebar Sections */
.sidebar-section {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: #fafafa;
    overflow: hidden;
}

.section-header {
    background-color: #f3f4f6;
    padding: 1rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.2s ease;
}

.section-header:hover {
    background-color: #e5e7eb;
}

.section-header h2 {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-header h2 i {
    font-size: 0.875rem;
    color: var(--primary-color);
}

.toggle-icon {
    color: var(--text-secondary);
    transition: transform 0.3s ease;
}

.section-content {
    padding: 1rem;
    background-color: white;
}

/* Sidebar Collapse Functionality */
.sidebar.collapsed {
    width: 50px;
    padding: 10px;
}

.sidebar.collapsed .section-content {
    display: none !important;
}

.sidebar.collapsed .section-header {
    padding: 0.5rem;
    justify-content: center;
}

.sidebar.collapsed .section-header h2 {
    display: none;
}

.sidebar.collapsed .toggle-icon {
    display: none;
}

.toggle-sidebar-button {
    position: absolute;
    right: -15px;
    top: 20px;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background-color: white;
    border: 1px solid var(--border-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    transition: transform 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.sidebar.collapsed .toggle-sidebar-button {
    transform: rotate(180deg);
}

/* Settings Section - Special Styling */
.settings-section {
    margin-top: auto;
    border: 2px solid var(--primary-color);
    background-color: #f0f9ff;
}

.settings-section .section-header {
    background-color: var(--primary-color);
    color: white;
}

.settings-section .section-header h2 {
    color: white;
}

.settings-section .section-header h2 i {
    color: white;
}

.settings-section .section-header .toggle-icon {
    color: white;
}

/* Transcript Container */
.transcript-container {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 96px; /* Space for floating control bar */
    display: flex;
    flex-direction: column;
    min-height: 0;
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    overflow-x: hidden;
    overflow-y: auto;
}

/* Recording Status Banner (깜박이는 점만) */
.recording-status-banner {
    position: absolute;
    top: 8px;
    right: 12px;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    padding: 0;
    background: rgba(239, 68, 68, 0.92);
    color: white;
    border-radius: 50%;
    font-size: 0;
    box-shadow: 0 2px 8px rgba(239, 68, 68, 0.35);
    animation: recording-pulse 2s ease-in-out infinite;
}

.recording-status-banner .recording-dot {
    width: 10px;
    height: 10px;
    background: white;
    border-radius: 50%;
    animation: recording-blink 1s ease-in-out infinite;
}

.recording-status-banner .recording-text {
    display: none;
}

@keyframes recording-blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

@keyframes recording-pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.02); }
}

/* ========================================
   4. UI COMPONENTS
   ======================================== */

/* Buttons */
button {
    cursor: pointer;
    font-weight: 500;
    border: none;
    transition: var(--transition);
    font-size: 0.875rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.primary-button {
    background-color: var(--primary-color);
    color: white;
}

.primary-button:hover {
    background-color: var(--primary-dark);
}

/* Settings > 자막: 멀티 오버레이 메뉴용 클래스가 아닌 앱 설정 패널용 버튼 */
#overlay-save-quick-start {
    width: 100%;
    box-sizing: border-box;
}

.secondary-button {
    background-color: white;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.secondary-button:hover {
    background-color: var(--light-bg);
}

.control-button {
    padding: 0.625rem 1.25rem;
    font-weight: 500;
    font-size: 0.875rem;
}

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

.start:hover:not(:disabled) {
    background-color: #0da271;
}

.stop {
    background-color: var(--danger-color);
    color: white;
}

.stop:hover:not(:disabled) {
    background-color: #dc2626;
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Special Button Styles */
.multi-translation-button {
    background-color: var(--secondary-color);
    color: white;
    margin-right: 10px;
}

.multi-translation-button:hover {
    background-color: var(--secondary-dark);
}

#create-session {
    background-color: var(--primary-color);
    color: white;
}

#create-session:hover:not(:disabled) {
    background-color: var(--primary-dark);
}

#login-button {
    background-color: white;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

#login-button:hover {
    background-color: var(--light-bg);
}

/* Demo Button Styling */
.demo-button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
    width: 100%;
    text-align: center;
    display: flex;
    align-items: center;
    gap: 8px;
    margin-right: 15px;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.demo-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.demo-button:active {
    transform: translateY(0);
}

.demo-button i {
    font-size: 16px;
}

/* Settings Section Button Styles */
.settings-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.settings-section .demo-button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    color: white;
    font-weight: 500;
}

.settings-section .demo-button:hover {
    background: linear-gradient(135deg, #5a67d8 0%, #6b46c1 100%);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.settings-section #login-button {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
    width: 100%;
}

.settings-section #login-button:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.settings-section #logout-button {
    background: var(--danger-color);
    color: white;
    border: none;
    padding: 10px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
    width: 100%;
}

.settings-section #logout-button:hover {
    background: #dc2626;
    transform: translateY(-1px);
}

/* User Profile Section */
.user-controls {
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

#user-profile {
    display: flex;
    align-items: center;
    gap: 10px;
}

#user-name {
    font-weight: 500;
    color: var(--text-primary);
}

#logout-button {
    background-color: transparent;
    color: var(--danger-color);
    border: 1px solid var(--danger-color);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

#logout-button:hover {
    background-color: var(--danger-color);
    color: white;
}

/* Form Elements */
.form-group {
    margin-bottom: 1.5rem;
    background: #f8fafc;
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    border: 1px solid #e2e8f0;
    transition: all 0.3s ease;
}

.form-group:hover {
    background: #f1f5f9;
    border-color: var(--primary-color);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.form-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.form-group label::before {
    content: '';
    width: 4px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 2px;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
    border: 2px solid #e2e8f0;
    font-size: 1rem;
    font-weight: 500;
    background-color: white;
    transition: all 0.3s ease;
    cursor: pointer;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
    transform: translateY(-1px);
}

.form-group input:hover,
.form-group select:hover {
    border-color: var(--primary-color);
}

/* Language Selection */
.language-selection {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.language-selection label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.language-selection select {
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    font-size: 1rem;
    background-color: white;
    color: var(--text-primary);
}

/* Session Management */
.session-info, .language-controls, .language-selection {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

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

.session-details {
    margin-bottom: 15px;
}

.session-details p {
    margin: 5px 0;
}

/* Session Mode Styles */
.session-mode-container {
    margin: 15px 0;
    padding: 10px;
    background-color: #f5f5f5;
    border-radius: 5px;
}

.session-mode-container label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.session-mode-container select {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background-color: white;
    font-size: 14px;
}

.mode-description {
    margin-top: 5px;
    font-size: 12px;
    color: #666;
    font-style: italic;
}

/* ASR Provider Styles */
.asr-provider-container {
    margin-top: 15px;
    padding: 10px;
    border-top: 1px solid var(--border-color);
    background-color: #f5f5f5;
    border-radius: 5px;
}

.asr-provider-container label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.asr-provider-container select {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background-color: white;
    font-size: 14px;
}

/* Translation Provider Styles */
.translation-provider-container {
    margin-top: 15px;
    padding: 10px;
    border-top: 1px solid var(--border-color);
    background-color: #f5f5f5;
    border-radius: 5px;
}

.translation-provider-container label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.translation-provider-container select {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background-color: white;
    font-size: 14px;
}

.provider-status {
    margin-top: 5px;
    font-size: 12px;
    min-height: 16px;
}

.status-success {
    color: #28a745;
}

.status-error {
    color: #dc3545;
}

.status-info {
    color: #17a2b8;
}

/* QR Code Container */
.qr-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: white;
    padding: 15px;
    border-radius: var(--radius-sm);
    margin: 15px 0;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.qr-container img {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: 4px;
    min-width: 200px;
    min-height: 200px;
}

/* End Session Button */
#end-session {
    margin-top: 15px;
    background-color: var(--danger-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    width: 100%;
    transition: background-color 0.3s ease;
}

#end-session:hover {
    background-color: #d32f2f;
}

/* Recording Controls - Removed, now in control bar */

/* Recording Status Indicator */
.recording-status {
    display: none; /* Hide the recognition status */
    padding: 5px 10px;
    border-radius: 20px;
    font-size: 14px;
    margin-left: 10px;
    transition: var(--transition);
    color: var(--text-secondary);
}

.recording-status.active {
    background-color: #ffebee;
    color: var(--danger-color);
    animation: pulse 1.5s infinite;
}

.recording-status.warning {
    background-color: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
}

.recording-status.error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.recording-status.success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.6; }
    100% { opacity: 1; }
}

/* Chat Container - merged into transcript-container */

/* Collapsible live transcript panel (session tab; default collapsed) */
.live-transcript-panel {
    flex-shrink: 0;
    background: #fff;
    border-bottom: 1px solid var(--border-color);
}

.live-transcript-panel-toggle {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 1rem;
    background: #f8fafc;
    border: none;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: left;
    gap: 0.5rem;
    transition: background 0.15s ease;
}

.live-transcript-panel-toggle:hover {
    background: #f1f5f9;
}

.live-transcript-panel-toggle:focus-visible {
    outline: none;
    box-shadow: inset 0 0 0 2px rgba(37, 99, 235, 0.35);
}

.live-transcript-chevron {
    flex-shrink: 0;
    font-size: 0.7rem;
    color: var(--text-secondary);
    transition: transform 0.2s ease;
}

.live-transcript-panel--collapsed .live-transcript-chevron {
    transform: rotate(-90deg);
}

.live-transcript-panel-body {
    overflow: hidden;
    transition: max-height 0.28s ease, opacity 0.2s ease;
    max-height: 140px;
    opacity: 1;
}

.live-transcript-panel--collapsed .live-transcript-panel-body {
    max-height: 0;
    opacity: 0;
    pointer-events: none;
}

.live-transcript-panel .transcript-display-container {
    border-bottom: none;
}

/* Real-time Transcript Display */
.transcript-display-container {
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--border-color);
    background-color: white;
    flex-shrink: 0;
}

.transcript-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.live-transcript {
    width: 100%;
    min-height: 2.5rem;
    max-height: 3.5rem;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background-color: var(--light-bg);
    font-family: inherit;
    font-size: 0.875rem;
    line-height: 1.4;
    color: var(--text-primary);
    resize: none;
    outline: none;
    transition: border-color 0.2s ease;
}

.live-transcript:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.1);
}

.live-transcript::placeholder {
    color: var(--text-secondary);
    font-style: italic;
}

/* Active Recording State */
.live-transcript.recording {
    border-color: var(--success-color);
    background-color: #f0fdf4;
}

/* Processing State */
.live-transcript.processing {
    border-color: var(--warning-color);
    background-color: #fffbeb;
}

.chat-box {
    flex: 1;
    padding: 0.75rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    background-color: var(--light-bg);
}

/* Chat Bubbles */
.chat-bubble {
    position: relative;
    padding: 12px 16px;
    border-radius: 18px;
    margin: 10px 0;
    max-width: 80%;
    box-shadow: var(--shadow-sm);
    animation: fade-in 0.3s ease;
    line-height: 1.4;
    font-size: var(--main-font-size, 1rem);
    font-family: var(--main-font-family, inherit);
}

.chat-bubble p {
    margin: 0;
}

.chat-bubble .timestamp {
    font-size: 11px;
    color: var(--text-secondary);
    margin-top: 5px;
    text-align: right;
}

.chat-bubble .language-indicator {
    position: absolute;
    top: -8px;
    right: 10px;
    background-color: var(--primary-color);
    color: white;
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 10px;
}

.chat-bubble.original {
    background-color: var(--bubble-original);
    align-self: flex-start;
    margin-right: auto;
}

.chat-bubble.translation {
    background-color: var(--bubble-translated);
    align-self: flex-start;
    margin-right: auto;
    border-left: 4px solid var(--success-color);
}

.chat-bubble.instructor {
    background-color: var(--bubble-original);
}

.chat-bubble.student {
    background-color: var(--bubble-student);
    align-self: flex-end;
    margin-left: auto;
}

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

/* ========================================
   5. INTERACTIVE ELEMENTS
   ======================================== */

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 9999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    justify-content: center;
    align-items: center;
}

.modal-content {
    background-color: white;
    padding: 2rem;
    border-radius: var(--radius-md);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    position: relative;
    animation: modalFadeIn 0.3s ease;
    z-index: 10001;
}

/* Session creation modal: keep inputs clean and calm */
#session-creation-modal .modal-content {
    max-width: 520px;
}

#session-creation-modal .form-group {
    background: transparent;
    padding: 0;
    border: none;
    border-radius: 0;
    transition: none;
}

#session-creation-modal .form-group:hover {
    background: transparent;
    border-color: transparent;
    transform: none;
    box-shadow: none;
}

#session-creation-modal .form-group label::before {
    display: none;
}

#session-creation-modal .form-group label {
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

#session-creation-modal .form-group input,
#session-creation-modal .form-group select {
    padding: 0.75rem 0.9rem;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: text;
    transform: none;
}

#session-creation-modal .form-group select {
    cursor: pointer;
}

#session-creation-modal .form-group input:focus,
#session-creation-modal .form-group select:focus {
    outline: none;
    border-color: rgba(37, 99, 235, 0.6);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

@keyframes modalFadeIn {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

.close-button {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
}

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

.modal h2 {
    margin-bottom: 1rem;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.modal p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.modal select {
    width: 100%;
    padding: 0.625rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
    font-size: 1rem;
}

/* Auth Options in Modals */
.auth-options {
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.auth-options p {
    margin: 8px 0;
    color: var(--text-secondary);
}

.auth-options a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.auth-options a:hover {
    text-decoration: underline;
}

/* Login modal: same dark theme as profile / main login view */
#login-modal .modal-content {
    background-color: var(--profile-surface);
    border-radius: 12px;
    box-shadow: var(--profile-card-shadow);
}

#login-modal .modal-content h2 {
    color: #fff;
}

#login-modal .form-group {
    background: transparent;
    padding: 0;
    border: none;
    border-radius: 0;
    transition: none;
}

#login-modal .form-group:hover {
    background: transparent;
    border-color: transparent;
    transform: none;
    box-shadow: none;
}

#login-modal .form-group label::before {
    display: none;
}

#login-modal .form-group label {
    color: var(--profile-label);
    font-weight: 500;
    font-size: 0.85rem;
    margin-bottom: 0.4rem;
}

#login-modal .form-group input {
    width: 100%;
    padding: 0.65rem 0.75rem;
    border: 1px solid var(--profile-input-border);
    border-radius: 6px;
    background: var(--profile-input-bg);
    color: #fff;
    font-size: 1rem;
    font-weight: 500;
    cursor: text;
    transform: none;
    transition: border-color 0.15s ease;
}

#login-modal .form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

#login-modal .form-group input:hover {
    border-color: var(--primary-color);
}

#login-modal .close-button {
    color: var(--profile-text-muted);
}

#login-modal .close-button:hover {
    color: #fff;
}

#login-modal .auth-options {
    border-top-color: var(--profile-divider);
}

#login-modal .auth-options p {
    color: var(--profile-text-muted);
}

/* Password Hint */
.password-hint {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
    margin-bottom: 0;
}

/* Notifications */
#notification-container {
    position: fixed;
    top: 20px;
    left: 20px;
    right: auto;
    z-index: 10060;
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-width: 300px;
}

.notification {
    padding: 15px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    color: white;
    position: relative;
    animation: slide-in 0.3s ease-out;
    transition: opacity 0.5s ease;
}

.notification-close {
    position: absolute;
    top: 5px;
    right: 8px;
    cursor: pointer;
    font-size: 18px;
    opacity: 0.7;
}

.notification-close:hover {
    opacity: 1;
}

.notification.info {
    background-color: var(--primary-color);
}

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

.notification.warning {
    background-color: var(--warning-color);
}

.notification.error {
    background-color: var(--danger-color);
}

.notification.fade-out {
    opacity: 0;
}

@keyframes slide-in {
    from { transform: translateX(-100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* Custom Confirmation Dialog */
.dialog-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10050;
    opacity: 0;
    transition: opacity 0.3s ease;
    padding: max(1rem, env(safe-area-inset-top, 0px)) max(1rem, env(safe-area-inset-right, 0px)) max(1rem, env(safe-area-inset-bottom, 0px)) max(1rem, env(safe-area-inset-left, 0px));
    box-sizing: border-box;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.dialog-overlay.show {
    opacity: 1;
}

.custom-dialog {
    background-color: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: min(400px, calc(100vw - 2rem));
    max-height: min(90vh, calc(100dvh - 2rem));
    overflow-x: hidden;
    overflow-y: auto;
    box-sizing: border-box;
    position: relative;
    flex-shrink: 0;
    margin: auto;
}

.dialog-content {
    padding: 1.5rem;
}

.dialog-content p {
    margin-bottom: 1.5rem;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--text-primary);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.dialog-buttons {
    display: flex;
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: 10px;
}

.dialog-button {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    border: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

.cancel-button {
    background-color: var(--light-bg);
    color: var(--text-secondary);
}

.cancel-button:hover {
    background-color: var(--border-color);
}

/* ========================================
   6. RESPONSIVE DESIGN
   ======================================== */
@media (max-width: 992px) {
    .app-header {
        flex-direction: row;
        gap: 0.5rem;
        padding: 0.5rem 1rem;
        min-height: 60px;
        flex-wrap: wrap;
    }
    
    .header-left {
        flex: 0 0 auto;
        order: 1;
    }
    
    .header-center {
        order: 3;
        flex: 1 1 100%;
        min-width: 100%;
    }
    
    .logo-container {
        flex-direction: row;
        gap: 0.5rem;
        text-align: left;
    }
    
    .logo-text h1 {
        font-size: 1.2rem;
    }
    
    .logo-text .tagline {
        font-size: 0.7rem;
    }
    
    .university-logo {
        height: 30px;
        max-width: 120px;
    }
    
    .header-right {
        order: 2;
        flex: 0 0 auto;
    }
    
    .translation-toggle-icon {
        margin-left: auto;
    }
    
    .tab-navigation {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.25rem;
    }
    
    .tab-button {
        padding: 0.4rem 0.8rem;
        font-size: 0.75rem;
    }
    
    .tab-button i {
        font-size: 0.9rem;
    }
    
    .login-container {
        padding: 2rem;
    }
    
    .tab-panel {
        padding: 0.5rem;
    }
    
    .session-control-bar {
        flex-direction: row;
        bottom: 12px;
        width: calc(100% - 16px);
        height: 60px;
        padding: 0 0.75rem;
        gap: 0.5rem;
        flex-wrap: nowrap;
        overflow: hidden;
        border-radius: 14px;
    }
    
    .transcript-container {
        bottom: 88px;
    }
    
    .control-bar-left {
        flex: 1;
        min-width: 0;
        overflow: hidden;
        justify-content: flex-start;
    }
    
    .control-bar-right {
        flex: 0 0 auto;
        flex-shrink: 0;
        justify-content: flex-end;
        gap: 0.4rem;
        overflow: visible;
    }
    
    .session-info-compact {
        gap: 0.5rem;
        font-size: 0.7rem;
    }
    
    .session-title-compact {
        max-width: 120px;
        font-size: 0.75rem;
    }
    
    .session-code-compact,
    .session-timer-compact {
        font-size: 0.65rem;
        padding: 0.2rem 0.4rem;
    }
    
    .end-session-compact {
        height: 34px;
        font-size: 0.65rem !important;
        padding: 0 0.5rem !important;
    }
    
    .end-session-compact span {
        display: inline !important;
    }
    
    .lock-questions-button {
        width: 36px;
        height: 36px;
        font-size: 0.9rem;
    }
    
    .lock-questions-button .lock-status-dot {
        width: 6px;
        height: 6px;
        bottom: 3px;
        right: 3px;
    }
    
    .record-toggle-button {
        height: 36px;
        padding: 0 12px;
        font-size: 0.8rem;
        gap: 6px;
    }

    .enter-multi-translation-btn {
        height: 36px;
        padding: 0 12px;
        font-size: 0.8rem;
    }
    
    .qr-display-compact {
        width: 42px;
        height: 42px;
    }
    
    .session-info-compact {
        gap: 0.5rem;
    }
    
    .session-title-compact {
        max-width: 100px;
        font-size: 0.7rem;
    }
    
    .session-code-compact,
    .session-timer-compact {
        font-size: 0.6rem;
        padding: 0.25rem 0.4rem;
    }
    
    .account-cards {
        grid-template-columns: 1fr;
    }
    
    .settings-container {
        flex-direction: row;
        gap: 1rem;
        min-height: auto;
    }
    
    .settings-sidebar {
        width: 240px;
        min-width: 200px;
        flex-shrink: 0;
        border-radius: var(--radius-md);
    }
    
    .settings-menu {
        flex-direction: column;
        overflow-y: auto;
        overflow-x: hidden;
        gap: 0;
        max-height: 600px;
    }
    
    .settings-menu-item {
        white-space: normal;
        flex-shrink: 0;
        padding: 0.75rem 1rem;
        border-bottom: 1px solid #f1f5f9;
        border-right: none;
    }
    
    .settings-menu-item:last-child {
        border-bottom: none;
    }
    
    .settings-menu-item.active::before {
        display: block;
    }
    
    .settings-content {
        padding: 1.5rem;
        min-width: 0;
        flex: 1;
    }
    
    .form-group {
        padding: 1rem;
    }
}

@media (max-width: 768px) {
    .app-header {
        min-height: 50px;
        padding: 0.4rem 0.8rem;
    }
    
    .main-content {
        height: calc(100vh - 50px);
    }
    
    .session-control-bar {
        bottom: 10px;
        width: calc(100% - 12px);
        height: 56px;
        padding: 0 0.6rem;
        gap: 0.4rem;
        border-radius: 14px;
    }
    
    .transcript-container {
        bottom: 84px;
    }
    
    .control-bar-left {
        flex: 1;
        min-width: 0;
        overflow: hidden;
    }
    
    .control-bar-right {
        flex: 0 0 auto;
        flex-shrink: 0;
        gap: 0.3rem;
    }
    
    .session-info-compact {
        gap: 0.4rem;
        font-size: 0.65rem;
    }
    
    .session-title-compact {
        max-width: 100px;
        font-size: 0.7rem;
    }
    
    .session-code-compact,
    .session-timer-compact {
        font-size: 0.6rem;
        padding: 0.15rem 0.3rem;
    }
    
    .end-session-compact {
        height: 30px;
        font-size: 0.6rem !important;
        padding: 0 0.4rem !important;
    }
    
    .end-session-compact span {
        display: inline !important;
    }
    
    .lock-questions-button {
        width: 32px;
        height: 32px;
        font-size: 0.85rem;
    }
    
    .lock-questions-button .lock-status-dot {
        width: 5px;
        height: 5px;
        bottom: 2px;
        right: 2px;
    }
    
    .record-toggle-button {
        height: 34px;
        padding: 0 10px;
        font-size: 0.8rem;
        gap: 6px;
    }

    .enter-multi-translation-btn {
        height: 34px;
        padding: 0 10px;
        font-size: 0.78rem;
    }

    .record-toggle-label {
        display: none;
    }
    
    .qr-display-compact {
        width: 38px;
        height: 38px;
    }
    
    .login-container {
        padding: 1.5rem;
    }
    
    .login-header h2 {
        font-size: 1.5rem;
    }
    
    .demo-button-large {
        padding: 1.25rem 1.5rem;
        font-size: 1rem;
    }
    
    .session-meta {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .recording-controls {
        flex-wrap: wrap;
        padding: 0.75rem 1rem;
    }
    
    .control-button {
        flex: 1;
        min-width: 120px;
    }
    
    .account-cards {
        gap: 1rem;
    }
    
    .account-card {
        margin-bottom: 0;
    }
    
    .settings-content {
        padding: 1rem;
    }
    
    .settings-panel h3 {
        font-size: 1.25rem;
    }
}

/* ========================================
   7. UTILITY CLASSES
   ======================================== */

/* Environment Indicator Styles */
#env-indicator {
    font-size: 10px;
    font-weight: bold;
    padding: 2px 6px;
    border-radius: 4px;
    display: inline-block;
    margin-top: 5px;
}

.env-dev {
    background-color: var(--warning-color);
    color: white;
}

.env-test {
    background-color: var(--accent-color);
    color: white;
}

.env-prod {
    display: none; /* Hide in production */
}

/* ========================================
   8. FEEDBACK AND PRIVACY MODAL STYLES
   ======================================== */

/* Privacy Policy Modal Styles */
.privacy-modal-content {
    max-width: 800px;
    max-height: 80vh;
    overflow-y: auto;
}

.privacy-content {
    line-height: 1.6;
}

.privacy-content section {
    margin-bottom: 2rem;
}

.privacy-content h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.1rem;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

.privacy-content ul {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.privacy-content li {
    margin-bottom: 0.5rem;
}

.privacy-content strong {
    color: var(--text-primary);
}

.privacy-footer {
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-secondary);
}

/* Feedback Modal Styles */
#feedback-form textarea {
    resize: vertical;
    min-height: 120px;
}

#feedback-form .form-group {
    margin-bottom: 1.5rem;
}

#feedback-form label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

#feedback-form input,
#feedback-form select,
#feedback-form textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

#feedback-form input:focus,
#feedback-form select:focus,
#feedback-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.1);
}

/* FAQ Modal Styles */
.faq-modal-content {
    max-width: 900px;
    max-height: 85vh;
    overflow-y: auto;
}

.faq-content {
    line-height: 1.6;
}

.faq-section {
    margin-bottom: 2.5rem;
    background: #f8fafc;
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    border: 1px solid #e2e8f0;
}

.faq-section h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

.faq-item {
    margin-bottom: 1.5rem;
    background: white;
    padding: 1.25rem;
    border-radius: var(--radius-md);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
    border-left: 4px solid var(--primary-color);
}

.faq-item:last-child {
    margin-bottom: 0;
}

.faq-item h4 {
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    font-size: 1rem;
    font-weight: 600;
}

.faq-item p {
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.5;
}

.faq-contact {
    margin-top: 2rem;
    padding: 1.5rem;
    background: linear-gradient(135deg, #f8fafc, #f1f5f9);
    border-radius: var(--radius-lg);
    border: 1px solid #e2e8f0;
    text-align: center;
}

.faq-contact h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.faq-contact ul {
    list-style: none;
    padding: 0;
    margin: 1rem 0;
}

.faq-contact li {
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
}

.faq-contact a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.faq-contact a:hover {
    text-decoration: underline;
}

/* Bug Report and Tech Support Modal Styles */
.bug-report-modal-content,
.tech-support-modal-content {
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    padding: 2rem;
}

#bug-report-form,
#tech-support-form {
    max-width: 100%;
}

#bug-report-form .form-group,
#tech-support-form .form-group {
    margin-bottom: 1.25rem;
}

#bug-report-form label,
#tech-support-form label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

#bug-report-form input,
#bug-report-form select,
#bug-report-form textarea,
#tech-support-form input,
#tech-support-form select,
#tech-support-form textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

#bug-report-form input:focus,
#bug-report-form select:focus,
#bug-report-form textarea:focus,
#tech-support-form input:focus,
#tech-support-form select:focus,
#tech-support-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.1);
}

#bug-report-form textarea,
#tech-support-form textarea {
    resize: vertical;
    min-height: 60px;
}

#bug-environment {
    background-color: white;
    color: var(--text-primary);
    cursor: text;
}

/* Mobile responsive adjustments for new modals */
@media (max-width: 768px) {
    .privacy-modal-content,
    .faq-modal-content,
    .bug-report-modal-content,
    .tech-support-modal-content {
        max-width: 95%;
        max-height: 90vh;
        padding: 1.5rem;
    }
    
    .privacy-content h3,
    .faq-section h3 {
        font-size: 1rem;
    }
    
    .privacy-content section,
    .faq-section {
        margin-bottom: 1.5rem;
        padding: 1rem;
    }
    
    .faq-item {
        padding: 1rem;
    }
    
    .faq-contact {
        padding: 1rem;
    }
    
    #bug-report-form .form-group,
    #tech-support-form .form-group {
        margin-bottom: 1rem;
    }
    
    #bug-report-form textarea,
    #tech-support-form textarea {
        min-height: 50px;
    }
}

/* ========================================
   LOADING OVERLAY STYLES
   ======================================== */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    border-radius: var(--border-radius-lg);
}

.loading-content {
    text-align: center;
    color: var(--text-primary);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 16px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-content p {
    margin: 0;
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Disabled button styles */
button:disabled {
    opacity: 0.6;
    cursor: not-allowed !important;
}

button:disabled:hover {
    transform: none !important;
    box-shadow: none !important;
}

/* --- Overlay Settings --- */

.overlay-preset-lang-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
}

.overlay-preset-lang-btn:hover {
    border-color: var(--primary-color);
    background: #f8fafc;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.overlay-preset-lang-btn .flag {
    font-size: 1.5rem;
    line-height: 1;
}

.overlay-preset-lang-btn .lang-name {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.overlay-lang-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.overlay-lang-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.6rem 1rem;
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.overlay-lang-label {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
}

.overlay-lang-remove-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border: none;
    border-radius: 4px;
    background: transparent;
    color: #dc2626;
    cursor: pointer;
    transition: color 0.15s, transform 0.15s;
    font-size: 1.1rem;
}

.overlay-lang-remove-btn:hover {
    color: #b91c1c;
    transform: scale(1.1);
}

.overlay-empty-hint {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-style: italic;
    margin: 0;
}

/* --- Session tab: header switch profile (no session) vs end session --- */
.header-switch-profile-btn {
    display: none;
    align-items: center;
    justify-content: center;
    width: 2.75rem;
    height: 2.75rem;
    min-width: 2.75rem;
    min-height: 2.75rem;
    padding: 0;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    line-height: 1;
    box-shadow: none;
}
.header-switch-profile-btn:hover {
    background: var(--light-bg);
}
.header-switch-profile-btn .header-switch-profile-avatar {
    width: 2.25rem;
    height: 2.25rem;
    border-radius: 6px;
    margin: 0;
    font-size: 1rem;
    font-weight: 700;
}

/* --- Session tab: header end session, large QR, creation actions --- */
.header-end-session-btn {
    display: none;
    align-items: center;
    justify-content: center;
    width: 2.75rem;
    height: 2.75rem;
    min-width: 2.75rem;
    min-height: 2.75rem;
    padding: 0;
    background: var(--danger-color);
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    cursor: pointer;
    font-weight: 700;
    line-height: 1;
}
.header-end-session-btn:hover {
    filter: brightness(1.05);
}

.session-creation-actions {
    display: grid;
    grid-template-columns: repeat(3, minmax(220px, 1fr));
    gap: 1rem;
    align-items: stretch;
    width: min(100%, 980px);
    margin: 0 auto;
}

.session-creation-actions .create-session-button {
    width: 100%;
    max-width: none;
    margin: 0;
}

.quick-start-button {
    font-size: 1rem;
    font-weight: 600;
    padding: 0.85rem 1.5rem;
}
.quick-start-multi {
    background: linear-gradient(135deg, #0ea5e9, #2563eb);
}
.quick-start-caption {
    background: linear-gradient(135deg, #14b8a6, #0d9488);
}

@media (max-width: 980px) {
    .session-creation-actions {
        grid-template-columns: 1fr;
    }
}

.session-title-above-qr {
    flex-shrink: 0;
    text-align: center;
    padding: 0.75rem 1rem 0.25rem;
    width: 100%;
}
.session-title-above-qr .session-title-compact {
    display: -webkit-box;
    max-width: none;
    font-size: 1.05rem;
    font-weight: 700;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.session-timer-below-qr {
    flex-shrink: 0;
    text-align: center;
    padding: 0.5rem 1rem 1rem;
    width: 100%;
}
.session-timer-below-qr .session-timer-compact {
    display: inline-flex;
    align-items: center;
}

.session-main-qr {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0.25rem 0.5rem 0.5rem;
    flex: 1 1 auto;
    min-height: 0;
    max-height: min(50vh, 260px);
    max-height: min(50dvh, 260px);
    overflow: hidden;
}
.session-main-qr-img {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
}

.enter-multi-translation-btn {
    height: 40px;
    padding: 0 14px;
    border-radius: 12px;
    border: 1px solid rgba(37, 99, 235, 0.28);
    background: #fff;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary-dark, #1d4ed8);
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    box-shadow: 0 1px 2px rgba(17, 24, 39, 0.06);
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
    flex-shrink: 0;
    white-space: nowrap;
}
.enter-multi-translation-btn:hover {
    border-color: var(--primary-color);
    background: #eff6ff;
    color: var(--primary-dark, #1d4ed8);
    box-shadow: 0 1px 3px rgba(37, 99, 235, 0.12);
}
.enter-multi-translation-btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}
.enter-multi-translation-btn i {
    font-size: 0.95rem;
}

@media (max-height: 560px) {
    .session-main-qr {
        max-height: min(38vh, 200px);
        max-height: min(38dvh, 200px);
    }
}

/* --- Multi-translation overlay --- */
.multi-translation-overlay {
    position: fixed;
    inset: 0;
    z-index: 10050;
    flex-direction: column;
    --multi-font-scale: 1;
}
.multi-translation-overlay.multi-theme-dark {
    background: #0f172a;
    color: #f8fafc;
}
.multi-translation-overlay.multi-theme-light {
    background: #f1f5f9;
    color: #0f172a;
}

.multi-overlay-inner {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
}

.multi-overlay-control-bar {
    flex-shrink: 0;
    padding: 0.35rem 0.75rem;
    background: rgba(0, 0, 0, 0.35);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}
.multi-translation-overlay.multi-theme-light .multi-overlay-control-bar {
    background: #e2e8f0;
    border-top-color: rgba(15, 23, 42, 0.1);
}
.multi-control-bar-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.4rem 0.6rem;
    min-height: 2.25rem;
    width: 100%;
    justify-content: space-between;
}
.multi-toolbar-left {
    flex-shrink: 0;
}
.multi-toolbar-right {
    flex: 1;
    min-width: 0;
    display: flex;
    justify-content: flex-end;
}
.multi-toolbar-right-inner {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.4rem 0.6rem;
    justify-content: flex-end;
    min-width: 0;
}
.multi-preset-lang-group {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    min-width: 0;
}
.multi-preset-overflow-wrap {
    position: relative;
    display: none;
    flex-shrink: 0;
}
.multi-preset-lang-popover {
    position: absolute;
    right: 0;
    bottom: calc(100% + 6px);
    top: auto;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    padding: 0.5rem;
    min-width: 3rem;
    background: #1e293b;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 45;
}
.multi-translation-overlay.multi-theme-light .multi-preset-lang-popover {
    background: #fff;
    border-color: rgba(15, 23, 42, 0.12);
}
@media (min-width: 769px) {
    .multi-preset-overflow-wrap {
        display: none !important;
    }
}
@media (max-width: 768px) {
    .multi-preset-lang-scroll--wide {
        display: none !important;
    }
    .multi-preset-overflow-wrap {
        display: block;
    }
}
.multi-preset-lang-scroll {
    display: flex;
    flex-wrap: nowrap;
    align-items: center;
    gap: 0.25rem;
    max-width: min(42vw, 320px);
    overflow-x: auto;
    padding: 0.1rem 0;
    scrollbar-width: thin;
}
.multi-preset-lang-btn {
    flex: 0 0 auto;
    border: 1px solid rgba(255, 255, 255, 0.15);
    background: rgba(255, 255, 255, 0.06);
    border-radius: 6px;
    padding: 0.25rem 0.5rem;
    font-size: 1.35rem;
    line-height: 1;
    cursor: pointer;
    color: inherit;
}
.multi-preset-lang-btn:hover {
    background: rgba(255, 255, 255, 0.12);
}
.multi-translation-overlay.multi-theme-light .multi-preset-lang-btn {
    border-color: rgba(15, 23, 42, 0.15);
    background: rgba(255, 255, 255, 0.85);
}
.multi-translation-overlay.multi-theme-light .multi-preset-lang-btn:hover {
    background: #fff;
}
.multi-layout-picker-wrap {
    position: relative;
}
.multi-layout-popover {
    position: absolute;
    bottom: calc(100% + 6px);
    left: 0;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    padding: 0.5rem;
    background: #0f172a;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 20;
    min-width: 9rem;
}
.multi-layout-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0.5rem;
    border: 1px solid transparent;
    border-radius: 6px;
    background: transparent;
    color: #e2e8f0;
    cursor: pointer;
    font-size: 0.85rem;
    width: 100%;
    text-align: left;
}
.multi-layout-option:hover {
    background: rgba(255, 255, 255, 0.06);
}
.multi-layout-option.active {
    border-color: var(--primary-color);
    background: rgba(59, 130, 246, 0.15);
}
.multi-layout-thumb {
    display: block;
    width: 52px;
    height: 34px;
    border-radius: 4px;
    flex-shrink: 0;
    border: 1px solid rgba(148, 163, 184, 0.35);
}
.multi-thumb-a {
    background:
        linear-gradient(#64748b, #64748b) 4px 6px / 14px 22px no-repeat,
        linear-gradient(#475569, #475569) 19px 6px / 14px 22px no-repeat,
        linear-gradient(#475569, #475569) 34px 6px / 14px 22px no-repeat,
        #1e293b;
}
.multi-thumb-b {
    background:
        linear-gradient(#64748b, #64748b) 4px 4px / 44px 8px no-repeat,
        linear-gradient(#475569, #475569) 4px 14px / 21px 16px no-repeat,
        linear-gradient(#475569, #475569) 27px 14px / 21px 16px no-repeat,
        #1e293b;
}
.multi-thumb-c {
    background:
        linear-gradient(#64748b, #64748b) 5px 4px / 12px 26px no-repeat,
        linear-gradient(#475569, #475569) 20px 4px / 12px 26px no-repeat,
        linear-gradient(#475569, #475569) 35px 4px / 12px 26px no-repeat,
        #1e293b;
}
/* D: up to four full-width horizontal bands stacked top→bottom */
.multi-thumb-d {
    background:
        linear-gradient(#64748b, #64748b) 4px 5px / 44px 5px no-repeat,
        linear-gradient(#475569, #475569) 4px 12px / 44px 5px no-repeat,
        linear-gradient(#475569, #475569) 4px 19px / 44px 5px no-repeat,
        linear-gradient(#475569, #475569) 4px 26px / 44px 5px no-repeat,
        #1e293b;
}
.multi-layout-label {
    font-weight: 600;
}

.multi-lang-modal {
    position: fixed;
    inset: 0;
    z-index: 10060;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}
.multi-lang-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
}
.multi-lang-modal-panel {
    position: relative;
    width: min(420px, 100%);
    max-height: min(72vh, 560px);
    display: flex;
    flex-direction: column;
    background: #0f172a;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}
.multi-lang-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.multi-lang-modal-header h3 {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
}
.multi-lang-modal-close {
    border: none;
    background: transparent;
    color: #94a3b8;
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
}
.multi-lang-search {
    margin: 0.5rem 1rem;
    padding: 0.45rem 0.65rem;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.06);
    color: #f8fafc;
    font-size: 0.9rem;
}
.multi-lang-list {
    flex: 1;
    overflow-y: auto;
    padding: 0 0.5rem 0.75rem;
    min-height: 0;
}
.multi-lang-row {
    display: block;
    width: 100%;
    text-align: left;
    padding: 0.55rem 0.65rem;
    margin: 0.15rem 0;
    border: none;
    border-radius: 6px;
    background: transparent;
    color: #e2e8f0;
    cursor: pointer;
    font-size: 0.9rem;
}
.multi-lang-row:hover {
    background: rgba(255, 255, 255, 0.08);
}

.multi-lang-modal.multi-lang-modal--light .multi-lang-modal-panel {
    background: #fff;
    border-color: rgba(15, 23, 42, 0.12);
    color: #0f172a;
}
.multi-lang-modal.multi-lang-modal--light .multi-lang-modal-header {
    border-bottom-color: rgba(15, 23, 42, 0.08);
}
.multi-lang-modal.multi-lang-modal--light .multi-lang-modal-close {
    color: #64748b;
}
.multi-lang-modal.multi-lang-modal--light .multi-lang-search {
    background: #f8fafc;
    border-color: rgba(15, 23, 42, 0.12);
    color: #0f172a;
}
.multi-lang-modal.multi-lang-modal--light .multi-lang-row {
    color: #0f172a;
}
.multi-lang-modal.multi-lang-modal--light .multi-lang-row:hover {
    background: rgba(15, 23, 42, 0.06);
}

.multi-grid-band {
    flex: 1 1 0;
    min-height: 0;
    display: flex;
    flex-direction: column;
}
.multi-empty-hint {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #94a3b8;
    font-size: 0.95rem;
    padding: 1rem;
}

.multi-overlay-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0.75rem;
    gap: 0.5rem;
    background: rgba(0, 0, 0, 0.25);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    flex-wrap: wrap;
}

.multi-toolbar-left,
.multi-toolbar-right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.multi-overlay-icon-btn {
    background: transparent;
    border: none;
    color: #e2e8f0;
    font-size: 1.1rem;
    cursor: pointer;
    padding: 0.35rem 0.5rem;
    border-radius: var(--radius-sm);
}
.multi-overlay-icon-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}
.multi-translation-overlay.multi-theme-light .multi-overlay-icon-btn {
    color: #0f172a;
}
.multi-translation-overlay.multi-theme-light .multi-overlay-icon-btn:hover {
    background: rgba(15, 23, 42, 0.08);
}

.multi-cc-toggle.multi-cc-active {
    background: rgba(14, 165, 233, 0.35);
    color: #38bdf8;
}
.multi-translation-overlay.multi-theme-light .multi-cc-toggle.multi-cc-active {
    background: rgba(14, 165, 233, 0.18);
    color: #0284c7;
}

.multi-toolbar-btn {
    padding: 0.35rem 0.65rem;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.06);
    color: #f1f5f9;
    cursor: pointer;
    font-size: 0.85rem;
}
.multi-translation-overlay.multi-theme-light .multi-toolbar-btn {
    border-color: rgba(15, 23, 42, 0.2);
    background: #fff;
    color: #0f172a;
}

.layout-pill {
    min-width: 2rem;
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: transparent;
    color: #cbd5e1;
    cursor: pointer;
    font-weight: 600;
}
.layout-pill.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
}

.multi-tts-wrap {
    position: relative;
    flex-shrink: 0;
}
.multi-tts-popover {
    position: absolute;
    right: 0;
    bottom: calc(100% + 6px);
    top: auto;
    padding: 0.5rem 0.65rem;
    min-width: 12rem;
    max-width: min(90vw, 18rem);
    background: #1e293b;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 35;
}
.multi-tts-popover-inner {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}
.multi-tts-popover-heading {
    font-size: 0.75rem;
    color: #94a3b8;
}
.multi-tts-select {
    width: 100%;
    max-width: 100%;
    padding: 0.35rem 0.45rem;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    background: rgba(255, 255, 255, 0.06);
    color: #f1f5f9;
    font-size: 0.85rem;
    box-sizing: border-box;
}
/* Dark overlay: solid control + option colors so native dropdown list stays readable */
.multi-translation-overlay.multi-theme-dark .multi-tts-popover {
    color-scheme: dark;
}
.multi-translation-overlay.multi-theme-dark .multi-tts-select {
    background-color: #0f172a;
    color: #f8fafc;
    border-color: rgba(148, 163, 184, 0.45);
}
.multi-translation-overlay.multi-theme-dark .multi-tts-select option {
    background-color: #0f172a;
    color: #f8fafc;
}
.multi-translation-overlay.multi-theme-light .multi-tts-popover {
    color-scheme: light;
    background: #fff;
    border-color: rgba(15, 23, 42, 0.12);
}
.multi-translation-overlay.multi-theme-light .multi-tts-popover-heading {
    color: #64748b;
}
.multi-translation-overlay.multi-theme-light .multi-tts-select {
    background: #fff;
    color: #0f172a;
    border: 1px solid rgba(15, 23, 42, 0.15);
}
.multi-translation-overlay.multi-theme-light .multi-tts-select option {
    background-color: #fff;
    color: #0f172a;
}

.multi-menu-dropdown {
    position: absolute;
    right: 0;
    bottom: 100%;
    top: auto;
    margin-bottom: 6px;
    margin-top: 0;
    background: #1e293b;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-md);
    min-width: 200px;
    z-index: 40;
    box-shadow: var(--shadow-lg);
}
.multi-translation-overlay.multi-theme-light .multi-menu-dropdown {
    background: #fff;
    border-color: rgba(15, 23, 42, 0.12);
}
.multi-menu-font-controls {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    font-size: 0.85rem;
}
.multi-translation-overlay.multi-theme-light .multi-menu-font-controls {
    border-bottom-color: rgba(15, 23, 42, 0.1);
}
.multi-menu-font-label {
    flex: 1;
    min-width: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: #94a3b8;
}
.multi-translation-overlay.multi-theme-light .multi-menu-font-label {
    color: #64748b;
}
.multi-menu-font-controls .multi-menu-font-btn {
    width: auto;
    min-width: 2.25rem;
    min-height: 2rem;
    padding: 0.25rem 0.5rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.08);
    color: #e2e8f0;
    cursor: pointer;
    font-size: 1rem;
    line-height: 1.2;
}
.multi-translation-overlay.multi-theme-light .multi-menu-font-controls .multi-menu-font-btn {
    border-color: rgba(15, 23, 42, 0.2);
    background: #f1f5f9;
    color: #0f172a;
}
.multi-menu-font-controls .multi-menu-font-btn:hover {
    filter: brightness(1.1);
}
.multi-menu-action-btn {
    display: block;
    width: 100%;
    text-align: left;
    padding: 0.6rem 0.85rem;
    border: none;
    background: none;
    color: #e2e8f0;
    cursor: pointer;
    font-size: 0.9rem;
}
.multi-translation-overlay.multi-theme-light .multi-menu-action-btn {
    color: #0f172a;
}
.multi-menu-action-btn:hover {
    background: rgba(255, 255, 255, 0.08);
}
.multi-translation-overlay.multi-theme-light .multi-menu-action-btn:hover {
    background: rgba(15, 23, 42, 0.06);
}
.multi-menu-action-btn--danger {
    color: #fca5a5 !important;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    margin-top: 0.15rem;
    padding-top: 0.65rem;
}
.multi-translation-overlay.multi-theme-light .multi-menu-action-btn--danger {
    color: #b91c1c !important;
    border-top-color: rgba(15, 23, 42, 0.1);
}
.multi-menu-action-btn--danger:hover {
    background: rgba(248, 113, 113, 0.15) !important;
}
.multi-translation-overlay.multi-theme-light .multi-menu-action-btn--danger:hover {
    background: rgba(220, 38, 38, 0.1) !important;
}

.multi-menu-wrap {
    position: relative;
    z-index: 40;
}

.multi-overlay-stage {
    flex: 1;
    min-height: 0;
    padding: 0.5rem;
    overflow: auto;
}

.multi-grid-root {
    min-height: 200px;
    height: 100%;
}

.multi-grid-root.layout-a {
    display: flex;
    flex-direction: column;
    gap: 8px;
    height: 100%;
}

.multi-grid-row {
    display: grid;
    gap: 8px;
    min-height: 0;
    align-content: stretch;
}

.multi-grid-root.layout-b {
    display: flex;
    flex-direction: column;
    gap: 8px;
    height: 100%;
}
.multi-b-source-strip {
    flex: 0 0 clamp(7rem, 22vh, 14rem);
    min-height: 7rem;
    flex-shrink: 0;
    overflow: hidden;
}
.multi-b-source-strip .multi-cell {
    min-height: 0;
    height: 100%;
    max-height: 100%;
    display: flex;
    flex-direction: column;
    padding: 0.4rem 0.5rem;
    overflow: hidden;
}
.multi-b-source-strip .multi-cell-body {
    flex: 1 1 0;
    min-height: 0;
    overflow-x: hidden;
    overflow-y: auto;
    scrollbar-gutter: stable;
    font-size: calc(clamp(1rem, 2.2vw, 1.4rem) * var(--multi-font-scale, 1));
}
.multi-b-trans-area {
    flex: 1 1 0;
    min-height: 0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
.multi-source-strip {
    flex: 0 0 auto;
}
.multi-trans-grid {
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
    overflow: auto;
}

.multi-grid-root.layout-c .multi-columns-scroll {
    display: flex;
    flex-direction: row;
    gap: 10px;
    overflow-x: auto;
    height: 100%;
    align-items: stretch;
    padding-bottom: 8px;
}
.multi-column {
    flex: 0 0 min(320px, 85vw);
    display: flex;
    flex-direction: column;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    min-height: 120px;
}
.multi-translation-overlay.multi-theme-light .multi-column {
    background: rgba(255, 255, 255, 0.95);
    border-color: rgba(15, 23, 42, 0.12);
}
.multi-grid-root.layout-c {
    overflow-x: hidden;
}
/* D: column of bands (same band model as A; one cell per row, max 4) */
.multi-grid-root.layout-d {
    overflow-x: hidden;
}
.multi-grid-root.layout-d .multi-grid-row {
    grid-template-columns: 1fr;
}
.multi-column.multi-c-col {
    flex: 1 1 0;
    min-width: 0;
    max-width: none;
    min-height: 0;
}
.multi-column.multi-c-col .multi-cell {
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
}
.multi-column.multi-c-col .multi-cell-body {
    flex: 1 1 0;
    min-height: 0;
    overflow-x: hidden;
    overflow-y: auto;
    scrollbar-gutter: stable;
}
.multi-col-head {
    padding: 0.35rem 0.5rem;
    font-size: 0.8rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    color: #94a3b8;
}
.multi-col-body {
    flex: 1;
    padding: 0.5rem;
    overflow: auto;
    font-size: 0.95rem;
}

.multi-cell {
    position: relative;
    display: flex;
    flex-direction: column;
    min-height: 0;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 8px;
    padding: 0.5rem;
}
.multi-translation-overlay.multi-theme-light .multi-cell {
    background: #fff;
    border-color: rgba(15, 23, 42, 0.12);
}
.multi-translation-overlay.multi-theme-light .multi-cell-source {
    border-color: rgba(37, 99, 235, 0.45);
}
.multi-cell-source {
    border-color: rgba(59, 130, 246, 0.45);
}
.multi-lang-tag {
    font-size: 0.75rem;
    color: #94a3b8;
    flex-shrink: 0;
}
.multi-cell-body {
    margin-top: 0.35rem;
    flex: 1 1 0;
    min-height: 0;
    font-size: calc(clamp(1.1rem, 2.2vw, 1.65rem) * var(--multi-font-scale, 1));
    line-height: 1.45;
    overflow-x: hidden;
    overflow-y: auto;
    scrollbar-gutter: stable;
}
.multi-source-interim {
    color: #94a3b8;
    font-style: italic;
}
.multi-source-line,
.multi-trans-line {
    margin: 0.2rem 0;
}
.multi-cell-close {
    position: absolute;
    top: 4px;
    right: 6px;
    border: none;
    background: transparent;
    color: #94a3b8;
    cursor: pointer;
    font-size: 1.1rem;
    line-height: 1;
}
.multi-cell-close:hover {
    color: #f87171;
}

.multi-student-q {
    padding: 0.35rem 0;
    border-bottom: 1px dashed rgba(255, 255, 255, 0.1);
    color: #fef08a;
    font-size: 0.9rem;
}

.multi-float-back {
    position: fixed;
    right: 16px;
    bottom: 96px;
    z-index: 10040;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    border: none;
    background: var(--primary-color);
    color: #fff;
    font-size: 1.25rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
}
.multi-float-back:hover {
    filter: brightness(1.08);
}