:root {
    --bg: #ffffff;
    --fg: #111827;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --muted: #6b7280;
    --border: #e5e7eb;
    --card-bg: #f9fafb;
    --code-bg: #111827;
    --code-fg: #e5e7eb;
    --nav-bg: rgba(255, 255, 255, 0.8);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0d1117;
        --fg: #f9fafb;
        --muted: #9ca3af;
        --border: #30363d;
        --card-bg: #161b22;
        --nav-bg: rgba(13, 17, 23, 0.8);
    }
}

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

html {
    scroll-smooth: always;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg);
    color: var(--fg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s;
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: var(--nav-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo span {
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 2rem;
    font-size: 0.875rem;
    font-weight: 500;
}

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

.nav-links a.active {
    color: var(--accent);
}

/* Layout */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 8rem 2rem 4rem;
}

section {
    padding: 4rem 0;
}

/* Hero */
.hero {
    padding: 4rem 0 8rem;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

.hero h1 span {
    color: var(--accent);
}

.hero p {
    font-size: 1.25rem;
    color: var(--muted);
    max-width: 600px;
    margin-bottom: 2.5rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    font-weight: 600;
    transition: all 0.2s;
    cursor: pointer;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-outline {
    border: 1px solid var(--border);
    color: var(--fg);
}

.btn-outline:hover {
    background: var(--card-bg);
}

/* Cards */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    padding: 2rem;
    border-radius: 12px;
    transition: border-color 0.2s, transform 0.2s;
}

.card:hover {
    border-color: var(--accent);
}

.card h3 {
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

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

.card-icon {
    width: 48px;
    height: 48px;
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    font-weight: bold;
}

/* Content */
.prose h2 {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 2rem;
}

.prose h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 3rem 0 1rem;
}

.prose p {
    margin-bottom: 1.5rem;
    color: var(--fg);
}

/* Code */
pre {
    background: var(--code-bg);
    color: var(--code-fg);
    padding: 1.5rem;
    border-radius: 12px;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    margin: 2rem 0;
    border: 1px solid var(--border);
}

code {
    font-family: var(--font-mono);
    background: rgba(0,0,0,0.05);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
}

pre code {
    background: transparent;
    padding: 0;
}

.pattern-box {
    background: #000;
    color: #4ade80;
    padding: 1rem;
    border-radius: 8px;
    font-family: var(--font-mono);
    letter-spacing: 0.5rem;
    text-align: center;
    margin: 1.5rem 0;
}

/* Callout */
.callout {
    border-left: 4px solid var(--accent);
    background: rgba(59, 130, 246, 0.05);
    padding: 1.5rem;
    border-radius: 0 8px 8px 0;
    margin: 2rem 0;
}

.callout h4 {
    color: var(--accent);
    margin-bottom: 0.5rem;
}

/* Footer */
footer {
    border-top: 1px solid var(--border);
    padding: 4rem 2rem;
    background: var(--card-bg);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-section h4 {
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--fg);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.75rem;
    font-size: 0.875rem;
    color: var(--muted);
}

.footer-section ul li a:hover {
    color: var(--accent);
}

.copyright {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    text-align: center;
    font-size: 0.875rem;
    color: var(--muted);
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    .nav-links {
        display: none;
    }
}