/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 40px;
    color: white;
}

.title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    font-weight: 300;
}

/* Main content */
.main-content {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    margin-bottom: 40px;
}

/* Auth pages: narrower card and centered form */
.auth-card {
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
}

.auth-card .form {
    max-width: 420px;
    margin: 0 auto;
}

.auth-card .form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 16px;
}

.auth-card label {
    text-align: left;
}

.auth-card input[type="text"],
.auth-card input[type="email"],
.auth-card input[type="password"] {
    padding: 12px 14px;
    border: 2px solid #e1e5ff;
    border-radius: 10px;
    font-size: 1rem;
}

.auth-card .btn {
    width: 100%;
    justify-content: center;
}

@media (max-width: 600px) {
    .auth-card {
        max-width: 100%;
    }
    .auth-card .form {
        max-width: 100%;
    }
}

/* Upload section */
.upload-section {
    margin-bottom: 30px;
}

.upload-area {
    border: 3px dashed #667eea;
    border-radius: 15px;
    padding: 60px 40px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: #f8f9ff;
}

.upload-area:hover,
.upload-area:focus {
    border-color: #764ba2;
    background: #f0f2ff;
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.2);
}

.upload-area.dragover {
    border-color: #764ba2;
    background: #e8ebff;
    transform: scale(1.02);
}

.upload-area.loading {
    border-color: #667eea;
    background: #f0f2ff;
}

.upload-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.upload-area h2 {
    color: #333;
    margin-bottom: 10px;
    font-size: 1.5rem;
}

.upload-area p {
    color: #666;
    margin-bottom: 5px;
}

.supported-formats {
    font-size: 0.9rem;
    color: #888;
    font-style: italic;
}

/* File info */
.file-info {
    display: flex;
    align-items: center;
    gap: 20px;
    text-align: left;
}

.file-preview img {
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.file-details h3 {
    color: #333;
    margin-bottom: 10px;
}

.file-details p {
    color: #666;
    margin-bottom: 5px;
}

/* Upload error */
.upload-error {
    background: #fdf2f2;
    border: 1px solid #fecaca;
    color: #e74c3c;
    padding: 15px;
    border-radius: 10px;
    margin-top: 15px;
}

/* Processing section */
.processing-section {
    text-align: center;
    padding: 40px;
}

.processing-indicator h3 {
    color: #333;
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.processing-indicator p {
    color: #666;
    font-size: 1rem;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

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

/* Progress bar */
.progress-bar {
    width: 100%;
    height: 8px;
    background: #e1e5ff;
    border-radius: 4px;
    overflow: hidden;
    margin: 20px 0;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea, #764ba2);
    width: 0%;
    transition: width 0.3s ease;
}

/* Steps list */
.steps-list {
    margin-top: 20px;
}

.step {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 10px 0;
    opacity: 0.5;
    transition: opacity 0.3s ease;
}

.step.active {
    opacity: 1;
    color: #667eea;
}

.step.completed {
    opacity: 0.8;
    color: #059669;
}

.step-icon {
    font-size: 1.2rem;
}

.step-text {
    font-weight: 500;
}

/* Processing states */
.processing-error {
    text-align: center;
    color: #e74c3c;
}

.processing-success {
    text-align: center;
    color: #059669;
}

.error-icon, .success-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

/* Results section */
.results-section {
    animation: fadeIn 0.5s ease-in;
}

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

.audio-controls {
    background: #f8f9ff;
    border-radius: 15px;
    padding: 30px;
    margin-bottom: 30px;
    border: 1px solid #e1e5ff;
}

.audio-controls h3 {
    color: #333;
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.voice-controls {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.voice-selection {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.voice-selection label {
    font-weight: 500;
    color: #333;
}

.voice-select {
    padding: 8px 15px;
    border: 2px solid #e1e5ff;
    border-radius: 8px;
    background: white;
    font-size: 1rem;
    cursor: pointer;
    transition: border-color 0.3s ease;
}

.voice-select:focus {
    outline: none;
    border-color: #667eea;
}

/* Audio progress */
.audio-progress {
    margin: 20px 0;
}

.time-display {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    font-size: 0.9rem;
    color: #666;
}

.audio-progress .progress-bar {
    position: relative;
    height: 6px;
    background: #e1e5ff;
    border-radius: 3px;
    cursor: pointer;
}

.audio-progress .progress-fill {
    height: 100%;
    background: #667eea;
    border-radius: 3px;
    transition: width 0.1s ease;
}

.progress-handle {
    position: absolute;
    top: 50%;
    width: 16px;
    height: 16px;
    background: #667eea;
    border: 2px solid white;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

/* Audio settings */
.audio-settings {
    display: flex;
    gap: 30px;
    margin: 20px 0;
    flex-wrap: wrap;
}

.volume-control, .speed-control {
    display: flex;
    align-items: center;
    gap: 10px;
}

.volume-control label, .speed-control label {
    font-weight: 500;
    color: #333;
    min-width: 60px;
}

.volume-slider, .speed-slider {
    width: 100px;
}

.volume-value, .speed-value {
    font-weight: 500;
    color: #667eea;
    min-width: 40px;
}

/* Download controls */
.download-controls {
    margin-top: 20px;
    text-align: center;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    min-height: 44px; /* Accessibility: minimum touch target */
}

.btn:focus {
    outline: 3px solid #667eea;
    outline-offset: 2px;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #f8f9ff;
    color: #667eea;
    border: 2px solid #e1e5ff;
}

.btn-secondary:hover:not(:disabled) {
    background: #f0f2ff;
    border-color: #667eea;
}

.btn-outline {
    background: transparent;
    color: #667eea;
    border: 2px solid #667eea;
}

.btn-outline:hover:not(:disabled) {
    background: #667eea;
    color: white;
}

.btn-icon {
    font-size: 1.1rem;
}

/* Content display */
.content-display {
    background: #f8f9ff;
    border-radius: 15px;
    padding: 30px;
    margin-bottom: 30px;
    border: 1px solid #e1e5ff;
}

.content-display h3 {
    color: #333;
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.content-text {
    line-height: 1.8;
    color: #333;
    font-size: 1.1rem;
    white-space: pre-wrap;
    max-height: 400px;
    overflow-y: auto;
    padding: 20px;
    background: white;
    border-radius: 10px;
    border: 1px solid #e1e5ff;
}

/* Actions */
.actions {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    justify-content: center;
}

/* Footer */
.footer {
    text-align: center;
    color: white;
    opacity: 0.8;
    font-size: 0.9rem;
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
    .spinner {
        animation: none;
    }
    
    .btn, .upload-area {
        transition: none;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .btn {
        border: 2px solid currentColor;
    }
    
    .upload-area {
        border-width: 4px;
    }
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .title {
        font-size: 2.5rem;
    }
    
    .main-content {
        padding: 30px 20px;
    }
    
    .upload-area {
        padding: 40px 20px;
    }
    
    .voice-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .voice-selection {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .actions {
        flex-direction: column;
    }
    
    .audio-settings {
        flex-direction: column;
        gap: 15px;
    }
    
    .file-info {
        flex-direction: column;
        text-align: center;
    }
}

/* Focus indicators for keyboard navigation */
.upload-area:focus {
    outline: 3px solid #667eea;
    outline-offset: 2px;
}

/* Error states */
.error {
    color: #e74c3c;
    background: #fdf2f2;
    border: 1px solid #fecaca;
    padding: 15px;
    border-radius: 10px;
    margin: 20px 0;
}

.success {
    color: #059669;
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    padding: 15px;
    border-radius: 10px;
    margin: 20px 0;
}

/* Hide empty validation placeholders */
.error:empty,
.success:empty {
    display: none;
}

/* Auth pages: inline, subtle field errors */
.auth-card .error {
    background: transparent;
    border: none;
    padding: 6px 0 0;
    margin: 0;
    font-size: 0.9rem;
}