:root {
    --primary: #667eea;
    --primary-dark: #5a6fd8;
    --secondary: #764ba2;
    --dark: #1a1a1a;
    --light: #ffffff;
    --gray: #6c757d;
    --light-gray: #f8f9fa;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

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

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--dark);
    background-color: var(--light-gray);
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

header h1 {
    font-size: 2rem;
    margin-bottom: 10px;
}

header p {
    opacity: 0.9;
}

main {
    padding: 30px;
}

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

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark);
}

.input-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-family: var(--font-family);
    font-size: 1rem;
    resize: vertical;
    min-height: 100px;
}

.input-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.btn-primary, .btn-secondary {
    display: inline-block;
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    text-decoration: none;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--box-shadow);
}

.btn-secondary {
    background-color: var(--gray);
    color: white;
}

.btn-secondary:hover {
    background-color: #5a6268;
    transform: translateY(-2px);
    box-shadow: var(--box-shadow);
}

.result-section {
    margin-top: 30px;
    border-top: 1px solid #eee;
    padding-top: 30px;
}

.result-header {
    margin-bottom: 20px;
}

.result-header h2 {
    color: var(--dark);
    font-size: 1.5rem;
}

.preview-section, .form-section, .code-section {
    margin-bottom: 30px;
    padding: 20px;
    background: var(--light-gray);
    border-radius: var(--border-radius);
}

.preview-section h3, .form-section h3, .code-section h3 {
    margin-bottom: 15px;
    color: var(--dark);
}

.preview-container {
    background: white;
    padding: 20px;
    border-radius: var(--border-radius);
    min-height: 200px;
    border: 1px solid #eee;
}

.form-container {
    background: white;
    padding: 20px;
    border-radius: var(--border-radius);
    border: 1px solid #eee;
}

.code-section textarea {
    width: 100%;
    min-height: 200px;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9rem;
    resize: vertical;
}

.embed-section {
    margin-bottom: 30px;
    padding: 20px;
    background: var(--light-gray);
    border-radius: var(--border-radius);
}

.embed-section h3 {
    margin-bottom: 15px;
    color: var(--dark);
}

.embed-section textarea {
    width: 100%;
    min-height: 200px;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9rem;
    resize: vertical;
}

.code-actions {
    margin-bottom: 10px;
    display: flex;
    justify-content: flex-end;
}

.loading {
    text-align: center;
    padding: 40px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(102, 126, 234, 0.2);
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

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

.error {
    background: #f8d7da;
    color: #721c24;
    padding: 15px;
    border-radius: var(--border-radius);
    border: 1px solid #f5c6cb;
    margin-top: 20px;
}

@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    .container {
        margin: 0;
    }
    
    header {
        padding: 20px 15px;
    }
    
    header h1 {
        font-size: 1.5rem;
    }
    
    main {
        padding: 20px 15px;
    }
    
    .preview-container, .form-container {
        padding: 10px;
    }
    
    .code-section textarea {
        min-height: 150px;
    }
}