:root {
    --bg: #0a0a0a;
    --surface: #141414;
    --surface2: #1e1e1e;
    --border: #2a2a2a;
    --text: #e0e0e0;
    --text-muted: #888;
    --accent: #4fc3f7;
    --accent2: #81c784;
    --accent3: #ffb74d;
    --code-bg: #1a1a2e;
    --link: #4fc3f7;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
}
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Navigation */
nav {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 0.8rem 2rem;
    display: flex;
    align-items: center;
    gap: 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
}
nav .logo {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: -0.5px;
}
nav .nav-links { display: flex; gap: 1.5rem; }
nav .nav-links a {
    color: var(--text-muted);
    font-size: 0.9rem;
    transition: color 0.2s;
}
nav .nav-links a:hover, nav .nav-links a.active { color: var(--accent); text-decoration: none; }

/* Layout */
.container { max-width: 960px; margin: 0 auto; padding: 2rem; }
.hero {
    text-align: center;
    padding: 4rem 2rem;
    background: linear-gradient(135deg, #0a0a2e 0%, #0a1a0a 100%);
    border-bottom: 1px solid var(--border);
}
.hero h1 { font-size: 2.5rem; margin-bottom: 0.5rem; }
.hero p { color: var(--text-muted); font-size: 1.1rem; }

/* Cards */
.cards { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; margin: 2rem 0; }
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    transition: border-color 0.2s;
}
.card:hover { border-color: var(--accent); }
.card h3 { color: var(--accent); margin-bottom: 0.5rem; }
.card .lang { font-size: 0.8rem; color: var(--accent3); margin-bottom: 0.5rem; }
.card p { color: var(--text-muted); font-size: 0.9rem; }

/* Content */
.content { background: var(--surface); border-radius: 8px; padding: 2rem; margin: 1.5rem 0; border: 1px solid var(--border); }
.content h1 { font-size: 2rem; margin-bottom: 1rem; color: var(--accent); }
.content h2 { font-size: 1.5rem; margin: 2rem 0 0.8rem; color: var(--accent2); border-bottom: 1px solid var(--border); padding-bottom: 0.3rem; }
.content h3 { font-size: 1.2rem; margin: 1.5rem 0 0.5rem; color: var(--accent3); }
.content p { margin: 0.8rem 0; }
.content ul, .content ol { margin: 0.8rem 0 0.8rem 1.5rem; }
.content li { margin: 0.3rem 0; }
.content code {
    background: var(--code-bg);
    padding: 0.15rem 0.4rem;
    border-radius: 3px;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.85em;
}
.content pre {
    background: var(--code-bg);
    padding: 1rem;
    border-radius: 6px;
    overflow-x: auto;
    margin: 1rem 0;
    border: 1px solid var(--border);
}
.content pre code { background: none; padding: 0; }

/* Tables */
.content table { width: 100%; border-collapse: collapse; margin: 1rem 0; }
.content th, .content td { padding: 0.6rem 0.8rem; text-align: left; border-bottom: 1px solid var(--border); }
.content th { color: var(--accent); font-weight: 600; background: var(--surface2); }
.content tr:hover { background: var(--surface2); }

/* Badges */
.badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 3px;
    font-size: 0.75rem;
    font-weight: 600;
}
.badge-done { background: #1b5e20; color: #81c784; }
.badge-wip { background: #e65100; color: #ffb74d; }
.badge-planned { background: #1a237e; color: #7986cb; }

/* Sidebar layout */
.page-layout { display: flex; gap: 2rem; max-width: 1200px; margin: 0 auto; padding: 2rem; }
.sidebar {
    width: 240px;
    flex-shrink: 0;
    position: sticky;
    top: 60px;
    max-height: calc(100vh - 80px);
    overflow-y: auto;
}
.sidebar a {
    display: block;
    padding: 0.4rem 0.8rem;
    color: var(--text-muted);
    font-size: 0.85rem;
    border-left: 2px solid transparent;
    transition: all 0.2s;
}
.sidebar a:hover, .sidebar a.active {
    color: var(--accent);
    border-left-color: var(--accent);
    text-decoration: none;
    background: var(--surface2);
}
.sidebar h4 { color: var(--text); padding: 0.4rem 0.8rem; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.05em; margin-top: 1rem; }
.main-content { flex: 1; min-width: 0; }

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.8rem;
    border-top: 1px solid var(--border);
    margin-top: 3rem;
}

/* ASCII art */
.ascii-art {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.7rem;
    line-height: 1.2;
    color: var(--accent);
    text-align: center;
    margin: 1rem 0;
}

/* Responsive */
@media (max-width: 768px) {
    .cards { grid-template-columns: 1fr; }
    .page-layout { flex-direction: column; }
    .sidebar { width: 100%; position: static; }
    nav { flex-direction: column; gap: 0.5rem; }
}