:root {
    --bg: #0d1117; --bg2: #161b22; --bg3: #21262d; --border: #30363d;
    --text: #e6edf3; --text2: #8b949e; --accent: #58a6ff; --accent2: #3fb950;
    --code-bg: #1c2128; --tag: #d2a8ff; --param: #79c0ff; --type: #ff7b72;
    --sidebar-w: 280px; --header-h: 60px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    background: var(--bg); color: var(--text); line-height: 1.6; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

header { position: fixed; top: 0; left: 0; right: 0; height: var(--header-h);
    background: var(--bg2); border-bottom: 1px solid var(--border); z-index: 100;
    display: flex; align-items: center; padding: 0 24px; }
header h1 { font-size: 1.3rem; font-weight: 600; }
header h1 span { color: var(--accent); }
header .version { margin-left: 16px; font-size: 0.85rem; color: var(--text2);
    background: var(--bg3); padding: 2px 10px; border-radius: 12px; }

nav { position: fixed; top: var(--header-h); left: 0; bottom: 0; width: var(--sidebar-w);
    background: var(--bg2); border-right: 1px solid var(--border); overflow-y: auto;
    padding: 16px 0; z-index: 99; }
nav::-webkit-scrollbar { width: 6px; }
nav::-webkit-scrollbar-thumb { background: var(--bg3); border-radius: 3px; }
nav .section-title { font-size: 0.7rem; font-weight: 600; text-transform: uppercase;
    letter-spacing: 0.08em; color: var(--text2); padding: 16px 20px 4px; }
nav a { display: block; padding: 5px 20px 5px 28px; font-size: 0.88rem; color: var(--text2);
    border-left: 2px solid transparent; transition: all 0.15s; }
nav a:hover { color: var(--text); background: var(--bg3); text-decoration: none; }
nav a.active { color: var(--accent); border-left-color: var(--accent); background: rgba(88,166,255,0.08); }

main { margin-left: var(--sidebar-w); margin-top: var(--header-h); padding: 32px 48px 80px; max-width: 960px; }

h2 { font-size: 1.6rem; font-weight: 600; margin: 48px 0 16px; padding-bottom: 8px;
    border-bottom: 1px solid var(--border); }
h2:first-child { margin-top: 0; }
h3 { font-size: 1.2rem; font-weight: 600; margin: 32px 0 12px; color: var(--accent); }
h4 { font-size: 1rem; font-weight: 600; margin: 24px 0 8px; color: var(--tag); }
p { margin: 8px 0; color: var(--text2); }
ul, ol { margin: 8px 0 8px 24px; color: var(--text2); }
li { margin: 4px 0; }
strong { color: var(--text); font-weight: 600; }
em { color: var(--accent2); font-style: normal; }

code { font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
    font-size: 0.88em; background: var(--code-bg); padding: 2px 6px; border-radius: 4px; }
pre { background: var(--code-bg); border: 1px solid var(--border); border-radius: 8px;
    padding: 16px 20px; overflow-x: auto; margin: 12px 0; font-size: 0.85rem; line-height: 1.55; }
pre code { background: none; padding: 0; }

.kw { color: var(--type); }
.tp { color: var(--accent); }
.str { color: #a5d6ff; }
.cm { color: #8b949e; font-style: italic; }
.num { color: #79c0ff; }
.fn { color: #d2a8ff; }

.card { background: var(--bg2); border: 1px solid var(--border); border-radius: 8px;
    padding: 20px; margin: 16px 0; }
.card h4 { margin-top: 0; }

.badge { display: inline-block; font-size: 0.7rem; font-weight: 600; padding: 2px 8px;
    border-radius: 10px; margin-left: 8px; vertical-align: middle; }
.badge-class { background: rgba(88,166,255,0.15); color: var(--accent); }
.badge-enum { background: rgba(210,168,255,0.15); color: var(--tag); }
.badge-interface { background: rgba(63,185,80,0.15); color: var(--accent2); }
.badge-static { background: rgba(255,123,114,0.15); color: var(--type); }

table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 0.9rem; }
th { text-align: left; font-weight: 600; padding: 8px 12px; border-bottom: 2px solid var(--border);
    color: var(--text2); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.04em; }
td { padding: 8px 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
tr:hover td { background: var(--bg2); }

.layer-diagram { display: grid; grid-template-columns: 1fr; gap: 2px; margin: 20px 0;
    font-family: monospace; font-size: 0.85rem; text-align: center; }
.layer-diagram .layer { padding: 10px; border: 1px solid var(--border); border-radius: 4px; }
.layer-diagram .l-app { background: rgba(210,168,255,0.12); color: var(--tag); }
.layer-diagram .l-tcap { background: rgba(88,166,255,0.12); color: var(--accent); }
.layer-diagram .l-sccp { background: rgba(63,185,80,0.12); color: var(--accent2); }
.layer-diagram .l-adapt { background: rgba(255,123,114,0.12); color: var(--type); }
.layer-diagram .l-sctp { background: rgba(121,192,255,0.12); color: var(--param); }

.toc { column-count: 2; column-gap: 32px; }
.toc a { display: block; padding: 3px 0; font-size: 0.9rem; }

@media (max-width: 900px) {
    nav { display: none; }
    main { margin-left: 0; padding: 24px 16px 60px; }
}