:root {
    --bg: #111318;
    --panel: #161a22;
    --muted: #8b93a7;
    --text: #e9eefc;
    --accent: #6ea8ff;
    --accent-2: #78f5cf;
    --ring: 0 0 0 3px rgba(110, 168, 255, .25);
    --radius: 16px;
    --border: #20273a;
}

* { box-sizing: border-box; }

html, body {
    height: 100%;
    margin: 0;
}

body {
    color: var(--text);
    background:
        radial-gradient(1200px 800px at 20% -10%, #1c2333 0%, rgba(28, 35, 51, 0) 60%),
        radial-gradient(1000px 700px at 120% 20%, #0e3b2f40 0%, rgba(14, 59, 47, 0) 55%),
        var(--bg);
    font: 500 16px/1.5 system-ui, -apple-system, Segoe UI, Roboto, Inter, Arial, sans-serif;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Header */
.site-header {
    position: sticky;
    top: 0;
    flex-shrink: 0;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    background: linear-gradient(180deg, #141923f5, #0f141bf5);
    border-bottom: 1px solid var(--border);
    backdrop-filter: saturate(130%) blur(10px);
    box-shadow: 0 4px 24px rgba(0, 0, 0, .35);
    z-index: 10;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    text-decoration: none;
    font-weight: 800;
}

.brand-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--accent-2);
    box-shadow: 0 0 18px rgba(120, 245, 207, .75), 0 0 2px rgba(120, 245, 207, 1);
}

.site-nav {
    display: flex;
    gap: 10px;
}

.nav-link {
    padding: 8px 12px;
    border-radius: 10px;
    color: var(--text);
    text-decoration: none;
    border: 1px solid #2b3142;
    background: #0d1117;
    font-weight: 600;
    font-size: 14px;
}

.nav-link:hover { filter: brightness(1.05); }

.nav-primary {
    border-color: #345fb3;
    background: linear-gradient(180deg, #2a69d0, #214ea6);
}

/* Layout */
.layout {
    flex: 1;
    min-height: 0;
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 16px;
    padding: 16px 24px;
}

.sidebar {
    background: linear-gradient(180deg, #141923, #10141b);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, .35), inset 0 1px 0 rgba(255, 255, 255, .04);
    overflow: auto;
    display: flex;
    flex-direction: column;
}

.content {
    background: linear-gradient(180deg, #141923, #10141b);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px 28px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, .35), inset 0 1px 0 rgba(255, 255, 255, .04);
    overflow: auto;
}

/* Search */
.search-wrap {
    padding: 4px 4px 8px;
    position: sticky;
    top: 0;
    background: inherit;
    z-index: 1;
}

#search {
    width: 100%;
    padding: 9px 12px;
    border-radius: 10px;
    border: 1px solid #29324a;
    background: #0d1117;
    color: var(--text);
    outline: none;
    font-size: 14px;
}

#search:focus {
    border-color: #36507e;
    box-shadow: var(--ring);
}

/* Nav groups */
.nav-group { margin-top: 10px; }

.nav-group-title {
    font-size: 10px;
    font-weight: 700;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--muted);
    margin: 6px 8px 4px;
}

.nav-group-list {
    display: grid;
    gap: 4px;
}

.nav-item {
    display: block;
    padding: 8px 12px;
    border-radius: 8px;
    color: var(--text);
    text-decoration: none;
    font-size: 14px;
    transition: .12s background, .12s border-color;
    border: 1px solid transparent;
}

.nav-item:hover {
    background: #12192a;
    border-color: #253050;
}

.nav-item.active {
    border-color: #345fb3;
    background: linear-gradient(180deg, #1b2a44, #142135);
}

/* Content title area */
#page-title {
    font-size: 26px;
    font-weight: 800;
    margin: 0 0 4px;
    color: var(--text);
}

.meta-row {
    color: var(--muted);
    font-size: 13px;
    margin: 0 0 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

/* Prose */
.prose h1 { display: none; } /* page-title element handles h1 */

.prose h2 {
    font-size: 17px;
    font-weight: 700;
    margin: 1.4em 0 0.4em;
    color: #cfe0ff;
    padding-bottom: 6px;
    border-bottom: 1px solid var(--border);
}

.prose h3 {
    font-size: 15px;
    font-weight: 700;
    margin: 1.2em 0 0.3em;
    color: #b8ccf0;
}

.prose p {
    margin: 0.6em 0;
    color: #cfd7ea;
    line-height: 1.65;
}

.prose ul {
    margin: 0.5em 0 0.8em 1.2em;
    color: #cfd7ea;
}

.prose li {
    margin: 4px 0;
    line-height: 1.6;
}

.prose strong { color: var(--text); }

.prose em { color: #a8b8d8; }

.prose hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 1.2em 0;
}

.prose code {
    padding: 0.1em 0.35em;
    border-radius: 5px;
    background: #0d1117;
    border: 1px solid #2b3142;
    font-size: 13px;
}

.prose pre {
    padding: 12px 16px;
    border-radius: 10px;
    background: #0d1117;
    border: 1px solid #2b3142;
    overflow: auto;
}

/* Mobile */
@media (max-width: 820px) {
    .layout {
        grid-template-columns: 1fr;
        overflow: auto;
    }

    body { overflow: auto; }

    .sidebar { order: 2; }
    .content { order: 1; }
}