style.css

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

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

header {
    text-align: center;
    color: white;
    margin-bottom: 40px;
    padding: 30px 20px;
}

header h1 {
    font-size: 2.5em;
    font-weight: 700;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.subtitle {
    font-size: 1.1em;
    opacity: 0.95;
}

main {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
}

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

.upload-area {
    border: 3px dashed #ddd;
    border-radius: 15px;
    padding: 60px 30px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: #fafafa;
}

.upload-area:hover {
    border-color: #667eea;
    background: #f5f5ff;
}

.upload-area.dragover {
    border-color: #667eea;
    background: #f0f0ff;
    transform: scale(1.02);
}

.upload-icon {
    width: 60px;
    height: 60px;
    color: #667eea;
    margin-bottom: 20px;
}

.upload-area h3 {
    color: #333;
    margin-bottom: 10px;
    font-size: 1.3em;
}

.upload-area p {
    color: #666;
}

.video-section {
    margin-bottom: 30px;
}

.video-container {
    margin-bottom: 30px;
}

#videoPlayer {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    display: block;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.controls {
    display: flex;
    gap: 20px;
    align-items: flex-end;
    flex-wrap: wrap;
    margin-top: 30px;
}

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

.control-group label {
    font-weight: 500;
    color: #555;
    font-size: 0.9em;
}

.control-group select {
    padding: 10px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1em;
    background: white;
    cursor: pointer;
    transition: border-color 0.3s;
}

.control-group select:hover {
    border-color: #667eea;
}

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

.process-btn {
    padding: 12px 30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    align-items: center;
    gap: 10px;
}

.process-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

.process-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.spinner {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.progress-section {
    margin: 30px 0;
}

.progress-bar {
    width: 100%;
    height: 30px;
    background: #f0f0f0;
    border-radius: 15px;
    overflow: hidden;
    margin-bottom: 15px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    transition: width 0.5s ease;
    border-radius: 15px;
}

#progressText {
    text-align: center;
    color: #666;
    font-size: 0.95em;
}

.results-section h2 {
    margin-bottom: 25px;
    color: #333;
    font-size: 1.8em;
}

.frames-list {
    display: grid;
    gap: 25px;
    margin-bottom: 30px;
}

.frame-card {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 20px;
    padding: 20px;
    background: #f9f9f9;
    border-radius: 12px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.frame-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.frame-thumbnail {
    position: relative;
}

.frame-thumbnail img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.frame-time {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 5px 10px;
    border-radius: 5px;
    font-size: 0.85em;
    font-weight: 500;
}

.frame-caption {
    display: flex;
    align-items: center;
}

.frame-caption p {
    line-height: 1.6;
    color: #444;
}

.export-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 30px;
}

.export-btn {
    padding: 10px 25px;
    background: white;
    color: #667eea;
    border: 2px solid #667eea;
    border-radius: 8px;
    font-size: 0.95em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.export-btn:hover {
    background: #667eea;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

footer {
    text-align: center;
    color: white;
    margin-top: 40px;
    padding: 20px;
    opacity: 0.9;
}

.hidden {
    display: none !important;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2em;
    }
    
    main {
        padding: 20px;
    }
    
    .controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .process-btn {
        width: 100%;
        justify-content: center;
    }
    
    .frame-card {
        grid-template-columns: 1fr;
    }
    
    .export-buttons {
        flex-direction: column;
    }
    
    .export-btn {
        width: 100%;
    }
}