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

:root {
    --primary-color: #61dafb;
    --secondary-color: #20232a;
    --text-color: #333;
    --bg-color: #ffffff;
    --border-color: #e0e0e0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
        sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

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

/* Header */
.site-header {
    background-color: var(--secondary-color);
    color: white;
    padding: 1rem 0;
    margin-bottom: 2rem;
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-title {
    font-size: 1.5rem;
    font-weight: bold;
}

.main-nav {
    display: flex;
    gap: 2rem;
}

.main-nav a {
    color: white;
    text-decoration: none;
    transition: color 0.3s;
}

.main-nav a:hover {
    color: var(--primary-color);
}

/* Hero */
.hero {
    text-align: center;
    padding: 3rem 0;
    margin-bottom: 3rem;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.hero p {
    font-size: 1.2rem;
    color: #666;
}

/* Content Grid */
.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.card {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    transition: box-shadow 0.3s;
}

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

.card h3 {
    margin-bottom: 0.5rem;
}

.card h3 a {
    color: var(--secondary-color);
    text-decoration: none;
}

.card h3 a:hover {
    color: var(--primary-color);
}

.card p {
    color: #666;
    font-size: 0.95rem;
}

/* Page Content */
.page-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 0;
}

.page-content h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.page-content h2 {
    font-size: 1.5rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.page-content h3 {
    font-size: 1.2rem;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}

.page-content p {
    margin-bottom: 1rem;
}

.page-content ul, .page-content ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

.page-content li {
    margin-bottom: 0.5rem;
}

.page-content code {
    background-color: #f5f5f5;
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

.page-content pre {
    background-color: #f5f5f5;
    padding: 1rem;
    border-radius: 5px;
    overflow-x: auto;
    margin-bottom: 1rem;
}

.page-content pre code {
    background-color: transparent;
    padding: 0;
}

/* Internal Links */
.internal-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.internal-link:hover {
    text-decoration: underline;
}

/* Footer */
.site-footer {
    background-color: #f5f5f5;
    padding: 2rem 0;
    margin-top: 4rem;
    text-align: center;
    color: #666;
}

/* Lab Badge */
.lab-badge {
    display: inline-block;
    background-color: #ff9800;
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 3px;
    font-size: 0.75rem;
    margin-left: 0.5rem;
}

/* Breadcrumb */
.breadcrumb {
    margin-bottom: 1rem;
    font-size: 0.9rem;
    color: #666;
}

.breadcrumb a {
    color: var(--primary-color);
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}