/* ==========================================================================
   Caption Generator Styles
   ========================================================================== */

/* --- CSS Variables --- */
:root {
    --primary: #64B5F6;
    --primary-dark: #42A5F5;
    --secondary: #72d4b7;
    --text: #e0e0e0;
    --text-light: #b0b0c0;
    --background: #22223b;
    --card-bg: #1E1E1E;
    --border: #424242;
    --error: #f44336;
    --warning: #ff9800;
    --success: #4caf50;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Border radius */
    --border-radius: 8px;
    --border-radius-small: 4px;
    --border-radius-large: 12px;
    --border-radius-pill: 25px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.2);
    --shadow-md: 0 2px 8px rgba(0,0,0,0.3);
    --shadow-lg: 0 4px 16px rgba(0,0,0,0.4);
}

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

body {
    font-family: 'Rubik', sans-serif;
    background: var(--background);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

/* --- Container --- */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

/* --- Card Component --- */
.card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    border: 1px solid var(--border);
    transition: box-shadow var(--transition-normal);
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

/* --- Navigation --- */
.nav-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-md) var(--spacing-xl);
    background: #161628;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

.brand {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-decoration: none;
    transition: transform var(--transition-normal);
}

.brand:hover {
    transform: scale(1.05);
}

.brand img {
    height: 30px;
    width: auto;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
}

.back-link {
    color: var(--secondary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--secondary);
    border-radius: var(--border-radius-pill);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.back-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--secondary);
    transition: left var(--transition-normal);
    z-index: -1;
}

.back-link:hover::before {
    left: 0;
}

.back-link:hover {
    color: #ffffff;
    text-decoration: none;
    transform: translateY(-1px);
}

/* --- Enhanced Settings Section --- */
.settings-section {
    margin-bottom: var(--spacing-xl);
    background: linear-gradient(135deg, rgba(100, 181, 246, 0.05), rgba(114, 212, 183, 0.05));
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-large);
    border: 1px solid rgba(100, 181, 246, 0.2);
    position: relative;
    overflow: hidden;
}

.settings-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.settings-section h2 {
    color: var(--primary);
    margin-bottom: var(--spacing-xl);
    font-size: 1.8rem;
    font-weight: 700;
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.settings-section h2::before {
    content: '';
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 8px;
    mask: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><circle cx="12" cy="12" r="3"/><path d="M12 1v6m0 6v6m11-7h-6m-6 0H1m17.5-3.5L17 12l3.5 3.5M6.5 8.5L3 12l3.5 3.5"/></svg>') center/contain;
    -webkit-mask: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><circle cx="12" cy="12" r="3"/><path d="M12 1v6m0 6v6m11-7h-6m-6 0H1m17.5-3.5L17 12l3.5 3.5M6.5 8.5L3 12l3.5 3.5"/></svg>') center/contain;
}

.settings-form {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

/* --- Enhanced Form Components --- */
.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.1);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-large);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
    position: relative;
}

.form-group:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(100, 181, 246, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(100, 181, 246, 0.1);
}

.form-group.checkbox {
    flex-direction: row;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
}

.form-group label {
    font-weight: 600;
    color: var(--text);
    font-size: 1rem;
    cursor: pointer;
    transition: color var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    position: relative;
}

.form-group label:hover {
    color: var(--primary);
}

/* Label icons */
.form-group label[for="maxWordsPerSubtitle"]::before {
    content: '📝';
    font-size: 1.2rem;
}

.form-group label[for="stretchCaptions"]::before {
    content: '↔️';
    font-size: 1.2rem;
}

.form-group label[for="includePunctuation"]::before {
    content: '❗';
    font-size: 1.2rem;
}

.form-group input[type="number"],
.form-group input[type="text"],
.form-group textarea {
    padding: var(--spacing-md) var(--spacing-lg);
    border: 2px solid rgba(100, 181, 246, 0.2);
    border-radius: var(--border-radius);
    font-family: inherit;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text);
    transition: all var(--transition-normal);
    font-size: 1rem;
    font-weight: 500;
}

.form-group input[type="number"]:focus,
.form-group input[type="text"]:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(100, 181, 246, 0.3);
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

.form-group textarea {
    min-height: 100px;
    resize: vertical;
}

/* Enhanced Checkbox Styling */
.form-group.checkbox input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--primary);
    cursor: pointer;
    border-radius: 4px;
    border: 2px solid var(--primary);
    background: transparent;
    transition: all var(--transition-fast);
    position: relative;
}

.form-group.checkbox input[type="checkbox"]:checked {
    background: var(--primary);
    transform: scale(1.1);
    box-shadow: 0 2px 8px rgba(100, 181, 246, 0.4);
}

.form-group.checkbox input[type="checkbox"]:hover {
    border-color: var(--secondary);
    box-shadow: 0 0 0 3px rgba(100, 181, 246, 0.2);
}

/* Number input enhancements */
.form-group input[type="number"] {
    text-align: center;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--primary);
}

/* Form group descriptions */
.form-group-description {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-top: var(--spacing-xs);
    opacity: 0.8;
    line-height: 1.4;
}

/* --- Upload Section --- */
.upload-section {
    margin-bottom: var(--spacing-xl);
}

.upload-box {
    border: 3px dashed var(--border);
    border-radius: var(--border-radius-large);
    padding: var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    background: rgba(100, 181, 246, 0.02);
    position: relative;
    overflow: hidden;
}

.upload-box::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(100, 181, 246, 0.1) 0%, transparent 70%);
    opacity: 0;
    transition: opacity var(--transition-slow);
    pointer-events: none;
}

.upload-box:hover::before {
    opacity: 1;
}

.upload-box.dragging {
    border-color: var(--primary);
    background: rgba(100, 181, 246, 0.1);
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
}

.upload-box svg {
    width: 64px;
    height: 64px;
    margin-bottom: var(--spacing-md);
    color: var(--primary);
    transition: all var(--transition-normal);
}

.upload-box:hover svg {
    transform: translateY(-4px);
    filter: drop-shadow(0 4px 8px rgba(100, 181, 246, 0.3));
}

.upload-box h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text);
    font-weight: 600;
}

.upload-box p {
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

/* --- Button Components --- */
button {
    background: var(--primary);
    color: #ffffff;
    border: none;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-pill);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    min-width: 120px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

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 var(--transition-normal);
}

button:hover::before {
    left: 100%;
}

button:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(100, 181, 246, 0.4);
}

button:active {
    transform: translateY(-1px);
}

button:disabled {
    background: var(--border);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
    opacity: 0.6;
}

button:disabled::before {
    display: none;
}

/* --- Loading States --- */
.loading-spinner {
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #ffffff;
    animation: spin 1s linear infinite;
}

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

button.loading {
    cursor: not-allowed;
    opacity: 0.8;
    pointer-events: none;
}

/* --- Preview Section --- */
#previewSection {
    animation: fadeInUp var(--transition-slow) ease-out;
}

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

/* --- Audio Player --- */
.audio-player {
    width: 100%;
    margin: var(--spacing-md) 0;
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    outline: none;
}

.audio-player::-webkit-media-controls-panel {
    background-color: var(--card-bg);
}

/* --- Current Caption Display --- */
.current-caption {
    background: linear-gradient(135deg, rgba(100, 181, 246, 0.1), rgba(114, 212, 183, 0.1));
    padding: var(--spacing-xl);
    margin: var(--spacing-md) 0;
    border-radius: var(--border-radius-large);
    text-align: center;
    font-size: 1.5rem;
    border: 2px solid var(--primary);
    position: relative;
    min-height: 140px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.current-caption::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at center, rgba(100, 181, 246, 0.1), transparent);
    pointer-events: none;
}

.current-caption .timestamp {
    color: var(--primary);
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    opacity: 0.9;
    z-index: 1;
}

.current-caption .text {
    font-size: 1.8rem;
    font-weight: 600;
    line-height: 1.4;
    color: var(--text);
    z-index: 1;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.current-caption .no-caption {
    color: var(--text-light);
    font-size: 1.2rem;
    font-weight: 400;
    z-index: 1;
}

.progress-bar {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transition: width 0.1s linear;
    border-radius: 0 0 var(--border-radius-large) var(--border-radius-large);
    box-shadow: 0 0 8px rgba(100, 181, 246, 0.5);
}

/* --- Captions List --- */
.captions {
    margin: var(--spacing-md) 0;
    max-height: 400px;
    overflow-y: auto;
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    background: var(--card-bg);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.1);
}

.captions::-webkit-scrollbar {
    width: 8px;
}

.captions::-webkit-scrollbar-track {
    background: var(--border);
    border-radius: 4px;
}

.captions::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 4px;
    transition: background var(--transition-fast);
}

.captions::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* --- Individual Caption --- */
.caption {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border);
    transition: all var(--transition-fast);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.caption::before {
    content: '';
    position: absolute;
    left: -100%;
    top: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(100, 181, 246, 0.1), transparent);
    transition: left var(--transition-normal);
}

.caption:hover::before {
    left: 100%;
}

.caption:hover {
    background: rgba(100, 181, 246, 0.05);
    transform: translateX(4px);
}

.caption.active {
    background: rgba(100, 181, 246, 0.15);
    border-left: 4px solid var(--primary);
    transform: translateX(0);
    box-shadow: inset 0 0 20px rgba(100, 181, 246, 0.1);
}

.caption:last-child {
    border-bottom: none;
}

.caption .timestamp {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.caption .text {
    font-size: 1.1rem;
    color: var(--text);
    font-weight: 400;
    line-height: 1.5;
}

/* --- User Info Display --- */
#userInfo {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(100, 181, 246, 0.1);
    border-radius: var(--border-radius);
    border: 1px solid var(--primary);
    backdrop-filter: blur(5px);
}

#userInfo > div {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
}

#userEmail {
    font-weight: 600;
    color: var(--text);
}

#userMinutes {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* --- Help Section --- */
.help-section {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-md);
    background: rgba(114, 212, 183, 0.1);
    border-radius: var(--border-radius);
    border: 1px solid var(--secondary);
    text-align: center;
}

.help-section p {
    color: var(--text-light);
    font-size: 0.9rem;
    margin: 0;
}

.help-section strong {
    color: var(--secondary);
    font-weight: 600;
}

/* --- Login Modal --- */
.modal-overlay {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.8);
    backdrop-filter: blur(5px);
    animation: fadeIn var(--transition-normal);
}

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

.modal-content {
    background-color: var(--card-bg);
    margin: 5% auto;
    padding: var(--spacing-xl);
    border: 1px solid var(--border);
    width: 90%;
    max-width: 400px;
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-lg);
    position: relative;
    animation: slideIn var(--transition-normal);
}

@keyframes slideIn {
    from { 
        transform: translateY(-30px);
        opacity: 0;
    }
    to { 
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.modal-header h2 {
    margin: 0;
    color: var(--primary);
    font-size: 1.8rem;
    font-weight: 600;
}

.close-btn {
    color: var(--text-light);
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
    padding: 0 var(--spacing-sm);
    transition: color var(--transition-fast);
    background: none;
    border: none;
    min-width: auto;
}

.close-btn:hover {
    color: var(--primary);
    transform: scale(1.1);
}

.modal-content p {
    color: var(--text-light);
    margin-bottom: var(--spacing-lg);
    text-align: center;
    line-height: 1.6;
}

.modal-content input[type="email"],
.modal-content input[type="password"] {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border);
    border-radius: var(--border-radius);
    background: var(--background);
    color: var(--text);
    font-family: inherit;
    font-size: 1rem;
    transition: all var(--transition-normal);
    margin-bottom: var(--spacing-md);
}

.modal-content input[type="email"]:focus,
.modal-content input[type="password"]:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(100, 181, 246, 0.2);
}

/* --- Error Messages --- */
.error-message {
    display: none;
    background: rgba(244, 67, 54, 0.1);
    color: var(--error);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
    text-align: center;
    border: 1px solid rgba(244, 67, 54, 0.3);
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

/* --- Responsive Design --- */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }

    .nav-bar {
        padding: var(--spacing-md);
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }

    .brand {
        font-size: 1.5rem;
    }

    .settings-form {
        grid-template-columns: 1fr;
    }

    .settings-section {
        padding: var(--spacing-lg);
    }

    .form-group {
        padding: var(--spacing-md);
    }

    .upload-box {
        padding: var(--spacing-lg);
    }

    .upload-box svg {
        width: 48px;
        height: 48px;
    }

    .current-caption {
        padding: var(--spacing-lg);
        min-height: 120px;
    }

    .current-caption .text {
        font-size: 1.5rem;
    }

    .captions {
        max-height: 300px;
    }

    .modal-content {
        margin: 10% auto;
        padding: var(--spacing-lg);
    }

    .modal-header h2 {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: var(--spacing-sm);
    }

    .card {
        padding: var(--spacing-lg);
    }

    .current-caption .text {
        font-size: 1.3rem;
    }

    .upload-box h3 {
        font-size: 1.1rem;
    }

    button {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.9rem;
    }
}

/* --- Print Styles --- */
@media print {
    .nav-bar,
    .upload-section,
    #userInfo,
    .help-section,
    button {
        display: none;
    }

    .container {
        max-width: none;
        padding: 0;
    }

    .captions {
        max-height: none;
        overflow: visible;
        border: none;
        box-shadow: none;
    }
}

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

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border: #ffffff;
        --text-light: #ffffff;
    }
}

/* Focus styles for accessibility */
*:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* --- Additional UI Components --- */

/* Screen reader only text */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* File types info */
.file-types {
    margin-top: var(--spacing-sm);
    opacity: 0.8;
}

.file-types small {
    color: var(--text-light);
    font-size: 0.85rem;
}

/* Audio section */
.audio-section {
    margin-bottom: var(--spacing-lg);
}

.audio-label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    color: var(--text);
}

/* Captions section enhancements */
.captions-section {
    margin-top: var(--spacing-lg);
}

.captions-header {
    margin-bottom: var(--spacing-sm);
    padding: 0 var(--spacing-sm);
}

.captions-header h4 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text);
}

/* Enhanced user info card */
.user-info-card {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: linear-gradient(135deg, rgba(100, 181, 246, 0.1), rgba(114, 212, 183, 0.05));
    border-radius: var(--border-radius);
    border: 1px solid var(--primary);
    backdrop-filter: blur(5px);
}

.user-info-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
}

.user-details {
    flex-grow: 1;
}

.user-email {
    font-weight: 600;
    color: var(--text);
    margin-bottom: var(--spacing-xs);
}

.user-minutes {
    font-size: 0.9rem;
    color: var(--text-light);
}

.logout-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.85rem;
    background: rgba(244, 67, 54, 0.1);
    color: var(--error);
    border: 1px solid rgba(244, 67, 54, 0.3);
    min-width: auto;
    gap: var(--spacing-xs);
}

.logout-btn:hover {
    background: var(--error);
    color: #ffffff;
    border-color: var(--error);
}

.logout-btn svg {
    width: 14px;
    height: 14px;
}

/* Enhanced help section */
.help-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: var(--spacing-md);
}

.help-title svg {
    width: 20px;
    height: 20px;
    color: var(--secondary);
}

.help-shortcuts {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(114, 212, 183, 0.2);
}

.help-shortcuts h4 {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text);
    margin-bottom: var(--spacing-sm);
}

.shortcuts-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: var(--spacing-xs);
}

.shortcuts-list li {
    font-size: 0.85rem;
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.shortcuts-list kbd {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--border-radius-small);
    padding: 2px 6px;
    font-family: monospace;
    font-size: 0.8rem;
    color: var(--text);
    box-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

/* Modal enhancements */
.modal-footer {
    text-align: center;
    margin-top: var(--spacing-lg);
}

.modal-footer a {
    color: var(--secondary);
    font-size: 0.9rem;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.modal-footer a:hover {
    color: var(--primary);
    text-decoration: underline;
}

/* Field validation errors */
.field-error {
    font-size: 0.8rem;
    color: var(--error);
    margin-top: var(--spacing-xs);
    display: none;
}

.field-error.show {
    display: block;
}

/* Enhanced button states */
.btn-text,
.btn-spinner {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.btn-spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* Enhanced loading states */
.processing-indicator {
    display: none;
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--text-light);
}

.processing-indicator.show {
    display: block;
}

.pulse-dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary);
    margin: 0 2px;
    animation: pulse-dot 1.4s infinite ease-in-out;
}

.pulse-dot:nth-child(1) { animation-delay: -0.32s; }
.pulse-dot:nth-child(2) { animation-delay: -0.16s; }
.pulse-dot:nth-child(3) { animation-delay: 0s; }

@keyframes pulse-dot {
    0%, 80%, 100% {
        transform: scale(0.6);
        opacity: 0.5;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}

/* File upload enhancements */
.upload-box.uploading {
    pointer-events: none;
    opacity: 0.7;
    background: rgba(100, 181, 246, 0.1);
}

.upload-box.uploading::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 10px,
        rgba(100, 181, 246, 0.1) 10px,
        rgba(100, 181, 246, 0.1) 20px
    );
    animation: loading-stripes 2s linear infinite;
}

@keyframes loading-stripes {
    0% { background-position: 0 0; }
    100% { background-position: 40px 0; }
}

/* Success states */
.success-message {
    background: rgba(76, 175, 80, 0.1);
    color: var(--success);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin: var(--spacing-md) 0;
    border: 1px solid rgba(76, 175, 80, 0.3);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.success-message svg {
    width: 20px;
    height: 20px;
    color: var(--success);
}

/* --- Enhanced Create Captions Button --- */
#createCaptionsBtn {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    padding: var(--spacing-lg) var(--spacing-xl);
    font-size: 1.2rem;
    font-weight: 600;
    min-width: 200px;
    margin: var(--spacing-xl) auto;
    display: block;
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-lg);
    text-shadow: 0 1px 2px rgba(0,0,0,0.2);
    transform: scale(1);
}

#createCaptionsBtn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left var(--transition-slow);
}

#createCaptionsBtn:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--secondary) 100%);
    transform: scale(1.05) translateY(-2px);
    box-shadow: 0 8px 25px rgba(100, 181, 246, 0.4);
}

#createCaptionsBtn:hover::before {
    left: 100%;
}

#createCaptionsBtn:active {
    transform: scale(1.02) translateY(-1px);
}

#createCaptionsBtn svg {
    width: 24px;
    height: 24px;
    margin-left: var(--spacing-sm);
}

/* --- Enhanced File Select Button --- */
.file-select-btn {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    color: var(--primary);
    border: 2px solid var(--primary);
    padding: var(--spacing-lg) var(--spacing-xl);
    font-size: 1.1rem;
    font-weight: 600;
    min-width: 180px;
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.file-select-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(100, 181, 246, 0.1), transparent);
    transition: left var(--transition-normal);
}

.file-select-btn:hover {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: #ffffff;
    border-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(100, 181, 246, 0.4);
}

.file-select-btn:hover::before {
    left: 100%;
}

.file-select-btn:active {
    transform: translateY(-1px);
}

.file-select-btn svg {
    width: 28px;
    height: 28px;
    margin-bottom: var(--spacing-xs);
    transition: transform var(--transition-normal);
}

.file-select-btn:hover svg {
    transform: scale(1.1);
}

.btn-text-primary {
    font-size: 1.1rem;
    font-weight: 700;
    line-height: 1.2;
    text-align: center;
}

.btn-text-secondary {
    font-size: 0.85rem;
    font-weight: 500;
    opacity: 0.8;
    line-height: 1;
    text-align: center;
}

.file-select-btn:hover .btn-text-secondary {
    opacity: 0.9;
}

/* --- Conversion Progress Bar --- */
.conversion-progress {
    margin-top: var(--spacing-lg);
    width: 100%;
}

.progress-bar-container {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 4px;
    transition: width 0.3s ease;
    position: relative;
    overflow: hidden;
}

.progress-bar-fill::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: progress-shine 2s infinite;
}

@keyframes progress-shine {
    0% { left: -100%; }
    100% { left: 100%; }
}

.progress-text {
    text-align: center;
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--primary);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

/* --- Change File Button --- */
.change-file-btn {
    background: linear-gradient(135deg, rgba(114, 212, 183, 0.1), rgba(100, 181, 246, 0.1));
    color: var(--secondary);
    border: 2px solid var(--secondary);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 0.95rem;
    font-weight: 600;
    min-width: 180px;
    margin: var(--spacing-xl) auto;
    display: block;
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(5px);
}

.change-file-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(114, 212, 183, 0.2), transparent);
    transition: left var(--transition-normal);
}

.change-file-btn:hover {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
    color: #ffffff;
    border-color: var(--secondary);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(114, 212, 183, 0.4);
}

.change-file-btn:hover::before {
    left: 100%;
}

.change-file-btn:active {
    transform: translateY(-1px);
}

.change-file-btn svg {
    width: 20px;
    height: 20px;
    margin-left: var(--spacing-sm);
    transition: transform var(--transition-normal);
    vertical-align: middle;
}

.change-file-btn:hover svg {
    transform: scale(1.1);
}