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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, 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;
    margin-bottom: 40px;
    color: white;
}

.header h1 {
    font-size: 3rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

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

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

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

.prompt-box {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
    padding: 25px;
    border-radius: 15px;
    margin-bottom: 30px;
}

.prompt-box h2 {
    margin-bottom: 15px;
    font-size: 1.5rem;
}

.prompt-box ol {
    margin-left: 20px;
    line-height: 1.6;
}

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

.input-container {
    margin-bottom: 25px;
}

.input-container label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: #555;
}

.input-container input {
    width: 100%;
    padding: 15px;
    border: 2px solid #e1e5e9;
    border-radius: 10px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.input-container input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.options-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.option-group label {
    font-weight: 600;
    color: #555;
    margin-bottom: 8px;
    display: block;
}

.option-group select {
    width: 100%;
    padding: 12px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 1rem;
    background: white;
    cursor: pointer;
}

.checkbox-container {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-weight: 600;
    color: #555;
}

.checkbox-container input {
    margin-right: 10px;
    transform: scale(1.2);
}

.generate-btn {
    width: 100%;
    padding: 18px;
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(79, 172, 254, 0.3);
}

.loading-section {
    text-align: center;
    padding: 40px;
    background: #f8f9fa;
    border-radius: 15px;
    margin: 20px 0;
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid #e1e5e9;
    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); }
}

.loading-text {
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 20px;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: #e1e5e9;
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea, #764ba2);
    width: 0%;
    animation: progress 3s ease-in-out infinite;
}

@keyframes progress {
    0% { width: 0%; }
    50% { width: 70%; }
    100% { width: 100%; }
}

.output-section {
    background: #f8f9fa;
    padding: 30px;
    border-radius: 15px;
    margin: 20px 0;
}

.output-section h3 {
    color: #28a745;
    margin-bottom: 25px;
    font-size: 1.5rem;
}

.video-container {
    margin-bottom: 25px;
    text-align: center;
}

.video-container video {
    width: 100%;
    max-width: 800px;
    border-radius: 10px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.download-section {
    text-align: center;
    margin-bottom: 25px;
}

.download-btn {
    padding: 12px 25px;
    background: #28a745;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: background 0.3s ease;
}

.download-btn:hover {
    background: #218838;
}

.transcript-section {
    margin-bottom: 25px;
}

.transcript-section h4 {
    margin-bottom: 15px;
    color: #555;
}

.transcript-container textarea {
    width: 100%;
    height: 150px;
    padding: 15px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-family: inherit;
    resize: vertical;
    background: white;
}

.playback-controls {
    display: flex;
    justify-content: center;
    gap: 10px;
}

.control-btn {
    width: 50px;
    height: 50px;
    border: none;
    border-radius: 50%;
    background: #667eea;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s ease, transform 0.2s ease;
}

.control-btn:hover {
    background: #5a6fd8;
    transform: scale(1.1);
}

.footer {
    text-align: center;
    color: white;
    opacity: 0.8;
    padding: 20px;
}

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .main-content {
        padding: 20px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .options-section {
        grid-template-columns: 1fr;
    }
}