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

:root {
    --bg-primary: #fff;
    --bg-secondary: #f5f5f5;
    --text-primary: #1a1a1a;
    --text-secondary: #666;
    --text-tertiary: #999;
    --border-color: #e5e5e5;
    --card-hover: #1a1a1a;
}

[data-theme="dark"] {
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --text-primary: #e5e5e5;
    --text-secondary: #a0a0a0;
    --text-tertiary: #666;
    --border-color: #2a2a2a;
    --card-hover: #e5e5e5;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    transition: background 0.3s, color 0.3s;
}

header {
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    background: var(--bg-primary);
    backdrop-filter: blur(10px);
    z-index: 100;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--text-primary);
    text-decoration: none;
}

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

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    transition: color 0.2s;
}

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

.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9375rem;
    transition: all 0.2s;
}

.theme-toggle:hover {
    border-color: var(--text-primary);
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.hero {
    padding: 6rem 0 4rem;
    text-align: center;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
}

.races-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
    margin: 4rem 0;
}

.race-card {
    padding: 2rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    text-decoration: none;
    color: inherit;
    transition: all 0.2s;
    background: var(--bg-primary);
}

.race-card:hover {
    border-color: var(--card-hover);
    transform: translateY(-2px);
}

.race-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.race-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 3rem;
    margin: 6rem 0;
    padding: 4rem 0;
    border-top: 1px solid var(--border-color);
}

.feature h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.feature p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

footer {
    border-top: 1px solid var(--border-color);
    padding: 3rem 0;
    text-align: center;
    color: var(--text-tertiary);
    font-size: 0.875rem;
    margin-top: 6rem;
}

/* Race pages */
.race-header {
    padding: 4rem 0 2rem;
}

.race-header h1 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.race-header .subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

.content-section {
    margin: 3rem 0;
}

.content-section h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.content-section h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin: 2rem 0 1rem;
}

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

.content-section ol {
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

.content-section ol li {
    padding: 0.25rem 0;
}

.content-section ul {
    list-style: none;
    padding: 0;
}

.content-section li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    padding-left: 1.5rem;
    position: relative;
}

.content-section ul li:before {
    content: "—";
    position: absolute;
    left: 0;
    color: var(--text-tertiary);
}

.milestone {
    padding: 2rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin: 2rem 0;
    background: var(--bg-primary);
}

.milestone-header {
    display: flex;
    align-items: baseline;
    gap: 1rem;
    margin-bottom: 1rem;
}

.level {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.milestone h3 {
    margin: 0;
}

.note {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    margin: 2rem 0;
}

.note p {
    margin: 0;
    font-size: 0.9375rem;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
}

th, td {
    text-align: left;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

th {
    font-weight: 600;
    font-size: 0.875rem;
}

td {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

pre {
    background: var(--bg-secondary);
    padding: 1rem;
    border-radius: 6px;
    font-family: "SF Mono", Monaco, monospace;
    font-size: 0.875rem;
    color: var(--text-primary);
    overflow-x: auto;
    line-height: 1.4;
}

code {
    background: var(--bg-secondary);
    padding: 0.125rem 0.375rem;
    border-radius: 3px;
    font-family: "SF Mono", Monaco, monospace;
    font-size: 0.875rem;
    color: var(--text-primary);
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .races-grid {
        grid-template-columns: 1fr;
    }
    
    .features {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}