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

:root {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --code-bg: #1e293b;
    --code-text: #e2e8f0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

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

/* Header */
header {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 20px 0;
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Main */
main {
    padding: 40px 0;
}

.generator-section {
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    margin-bottom: 40px;
}

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

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

.control-group label {
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.control-group select,
.control-group input {
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    background-color: var(--card-bg);
    transition: border-color 0.2s;
}

.control-group select:focus,
.control-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Data Types */
.data-types {
    margin-bottom: 30px;
}

.data-types h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
}

.checkbox-grid label {
    display: flex;
    align-items: center;
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: background-color 0.2s;
}

.checkbox-grid label:hover {
    background-color: var(--bg-color);
}

.checkbox-grid input[type="checkbox"] {
    margin-right: 8px;
    width: 18px;
    height: 18px;
    cursor: pointer;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
}

.primary-btn,
.secondary-btn {
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

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

.primary-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

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

.secondary-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(100, 116, 139, 0.3);
}

/* Output Section */
.output-section {
    margin-bottom: 20px;
}

.output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.output-header h3 {
    font-size: 1.2rem;
    color: var(--text-primary);
}

.output-actions {
    display: flex;
    gap: 10px;
}

.icon-btn {
    padding: 8px 12px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    font-size: 1.2rem;
    transition: background-color 0.2s, border-color 0.2s;
}

.icon-btn:hover {
    background-color: var(--border-color);
    border-color: var(--secondary-color);
}

.output-box {
    background-color: var(--code-bg);
    color: var(--code-text);
    padding: 20px;
    border-radius: 8px;
    min-height: 200px;
    max-height: 400px;
    overflow-y: auto;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    white-space: pre-wrap;
}

/* Stats */
.stats {
    text-align: right;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Features */
.features {
    margin-bottom: 40px;
}

.features h2 {
    font-size: 1.8rem;
    margin-bottom: 25px;
    text-align: center;
    color: var(--text-primary);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.feature-card {
    background-color: var(--card-bg);
    padding: 25px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.feature-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 15px;
}

.feature-card h4 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Usage */
.usage {
    background-color: var(--card-bg);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.usage h2 {
    font-size: 1.8rem;
    margin-bottom: 25px;
    text-align: center;
}

.usage-examples {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
}

.example {
    padding: 20px;
    background-color: var(--bg-color);
    border-radius: 8px;
}

.example h4 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.example p {
    color: var(--text-secondary);
}

/* Footer */
footer {
    background-color: var(--code-bg);
    color: var(--code-text);
    padding: 30px 0;
    text-align: center;
    margin-top: 60px;
}

/* Loading State */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* Success Message */
.success-message {
    position: fixed;
    top: 20px;
    right: 20px;
    background-color: var(--success-color);
    color: white;
    padding: 15px 20px;
    border-radius: 6px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Responsive */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.5rem;
    }
    
    .tagline {
        font-size: 1rem;
    }
    
    .generator-section {
        padding: 20px;
    }
    
    .controls {
        grid-template-columns: 1fr;
    }
    
    .checkbox-grid {
        grid-template-columns: 1fr;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .usage-examples {
        grid-template-columns: 1fr;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #0f172a;
        --card-bg: #1e293b;
        --text-primary: #e2e8f0;
        --text-secondary: #94a3b8;
        --border-color: #334155;
        --code-bg: #0f172a;
    }
    
    .control-group select,
    .control-group input {
        background-color: var(--bg-color);
        color: var(--text-primary);
    }
    
    .icon-btn {
        background-color: var(--code-bg);
        color: var(--text-primary);
    }
}

/* Scrollbar Style */
.output-box::-webkit-scrollbar {
    width: 8px;
}

.output-box::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
}

.output-box::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.3);
    border-radius: 4px;
}

.output-box::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.5);
}