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

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #ffffff;
    --bg-light: #f9fafb;
    --border-color: #e5e7eb;
    --link-color: #2563eb;
    --link-hover: #1d4ed8;
    --max-width: 900px;
    --spacing: 1.5rem;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-light);
    padding: 2rem 1rem;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    background: var(--bg-color);
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: white;
    padding: 2rem var(--spacing);
    text-align: center;
}

header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.subtitle {
    font-size: 1rem;
    opacity: 0.9;
    margin-top: 0.5rem;
}

.breadcrumb {
    margin-top: 1rem;
    text-align: left;
}

.breadcrumb a {
    color: white;
    text-decoration: none;
    opacity: 0.9;
    font-size: 0.9rem;
    transition: opacity 0.2s;
}

.breadcrumb a:hover {
    opacity: 1;
    text-decoration: underline;
}

.nav-links {
    display: flex;
    gap: 1rem;
    padding: var(--spacing);
    background: var(--bg-light);
    border-bottom: 1px solid var(--border-color);
    justify-content: center;
    flex-wrap: wrap;
}

.nav-link {
    color: var(--link-color);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: all 0.2s;
    font-weight: 500;
}

.nav-link:hover {
    background: var(--primary-color);
    color: white;
}

main {
    padding: var(--spacing);
}

.landing-content {
    text-align: center;
    padding: 2rem var(--spacing);
}

.landing-content > p {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 2rem;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.card {
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.card h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.card p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
}

.btn {
    display: inline-block;
    background: var(--primary-color);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    transition: background 0.2s;
}

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

.content h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.last-updated {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 2rem;
    font-style: italic;
}

section {
    margin-bottom: 2.5rem;
}

section h2 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

section p {
    margin-bottom: 1rem;
    color: var(--text-color);
}

section ul {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

section li {
    margin-bottom: 0.75rem;
    color: var(--text-color);
}

section li strong {
    color: var(--text-color);
    font-weight: 600;
}

a {
    color: var(--link-color);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

footer {
    background: var(--bg-light);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing);
    text-align: center;
    color: var(--text-light);
    font-size: 0.9rem;
}

footer p {
    margin-bottom: 0.5rem;
}

footer a {
    color: var(--link-color);
    margin: 0 0.5rem;
}

@media (max-width: 768px) {
    body {
        padding: 1rem 0.5rem;
    }
    
    header {
        padding: 1.5rem 1rem;
    }
    
    header h1 {
        font-size: 1.5rem;
    }
    
    main {
        padding: 1rem;
    }
    
    .content h1 {
        font-size: 1.75rem;
    }
    
    section h2 {
        font-size: 1.25rem;
    }
    
    .card-grid {
        grid-template-columns: 1fr;
    }
    
    .nav-links {
        flex-direction: column;
        align-items: stretch;
    }
    
    .nav-link {
        text-align: center;
    }
}