:root {
    --primary: #0099ff;
    --text: #1a1a1b;
    --muted: #5f6368;
    --border: #e8eaed;
    --bg: #ffffff;
}

body {
    font-family: 'Inter', -apple-system, system-ui, sans-serif;
    color: var(--text);
    line-height: 1.6;
    margin: 0;
    scroll-behavior: smooth;
}

.header {
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    background: white;
    z-index: 100;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

.logo { height: 40px; }

.layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 60px;
    margin: 48px auto;
}

.sidebar {
    position: sticky;
    top: 100px;
    height: fit-content;
}

.sidebar h4 {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--muted);
    letter-spacing: 0.05em;
    margin-bottom: 12px;
}

.sidebar ul {
    list-style: none;
    padding: 0;
    margin-bottom: 32px;
}

.sidebar a {
    text-decoration: none;
    color: var(--text);
    font-size: 0.9rem;
    display: block;
    padding: 6px 0;
}

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

.content h1 { font-size: 2.5rem; margin-top: 0; }
.content h2 { font-size: 1.5rem; margin-top: 3rem; border-bottom: 1px solid var(--border); padding-bottom: 8px; }
.content h3 { font-size: 1.1rem; margin-top: 1.5rem; color: var(--primary); }
.content p, .content li { margin-bottom: 1.2rem; }

.meta-info { color: var(--muted); font-size: 0.9rem; margin-bottom: 32px; }

@media (max-width: 850px) {
    .layout { grid-template-columns: 1fr; }
    .sidebar { display: none; }
}