:root{
  --marine:#1f2a5e; --marine2:#2c3a80; --accent:#4f46e5; --accent2:#6366f1;
  --bg:#f6f7fb; --panel:#ffffff; --line:#e6e8f0; --ink:#1a2233; --muted:#6b7280;
  --ok:#0f9d58; --warn:#e8a13a; --danger:#e5484d;
  --radius:14px; --shadow:0 1px 3px rgba(20,30,70,.06),0 8px 24px rgba(20,30,70,.06);
  --sidebar:280px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Segoe UI",Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.6}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
code{background:#eef0f7;padding:.12em .4em;border-radius:6px;font-size:.88em;font-family:"Cascadia Code",Consolas,monospace}
pre{background:#0f1530;color:#e7ebff;padding:16px 18px;border-radius:12px;overflow:auto;font-size:.86rem;line-height:1.5}
pre code{background:none;color:inherit;padding:0}

/* Layout */
.layout{display:flex;min-height:100vh}
.sidebar{width:var(--sidebar);flex:0 0 var(--sidebar);background:linear-gradient(180deg,var(--marine),var(--marine2));color:#dfe4f5;position:sticky;top:0;height:100vh;overflow-y:auto;padding:22px 0}
.brand{display:flex;align-items:center;gap:12px;padding:0 22px 18px;border-bottom:1px solid rgba(255,255,255,.12);margin-bottom:14px}
.brand .logo{width:38px;height:38px;border-radius:10px;background:linear-gradient(135deg,#6d78ff,#a6b0ff);display:flex;align-items:center;justify-content:center;font-weight:800;color:#12163a}
.brand b{font-size:1.05rem;color:#fff;letter-spacing:.3px}
.brand small{display:block;color:#aeb8e6;font-weight:400;font-size:.72rem}
.nav-group{padding:12px 14px 4px 22px;font-size:.7rem;text-transform:uppercase;letter-spacing:.12em;color:#8b96cf}
.sidebar a{display:block;color:#cfd6f2;padding:8px 22px;font-size:.92rem;border-left:3px solid transparent}
.sidebar a:hover{background:rgba(255,255,255,.06);text-decoration:none}
.sidebar a.active{background:rgba(255,255,255,.10);border-left-color:#8f9bff;color:#fff;font-weight:600}
.sidebar .sub{padding-left:38px;font-size:.86rem;color:#aeb8e6}

.main{flex:1;min-width:0;display:flex;flex-direction:column}
.topbar{background:var(--panel);border-bottom:1px solid var(--line);padding:14px 34px;display:flex;align-items:center;gap:14px;position:sticky;top:0;z-index:5}
.topbar .crumb{color:var(--muted);font-size:.9rem}
.topbar .badge{margin-left:auto;background:#eef0ff;color:var(--accent);padding:4px 12px;border-radius:999px;font-size:.76rem;font-weight:600}
.content{padding:34px 40px 80px;max-width:1080px;width:100%}

/* Typo */
h1{font-size:2rem;margin:.2em 0 .3em;letter-spacing:-.01em}
h2{font-size:1.4rem;margin:1.8em 0 .5em;padding-bottom:.3em;border-bottom:2px solid var(--line)}
h3{font-size:1.12rem;margin:1.4em 0 .4em;color:var(--marine)}
.lead{font-size:1.12rem;color:#455}
.hr{height:1px;background:var(--line);margin:26px 0;border:0}

/* Cards */
.grid{display:grid;gap:16px}
.grid.c2{grid-template-columns:repeat(2,1fr)}
.grid.c3{grid-template-columns:repeat(3,1fr)}
@media(max-width:900px){.grid.c2,.grid.c3{grid-template-columns:1fr}}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;box-shadow:var(--shadow)}
.card h3{margin-top:0;display:flex;align-items:center;gap:10px}
.card .ic{width:34px;height:34px;border-radius:9px;display:inline-flex;align-items:center;justify-content:center;font-size:1.1rem;background:#eef2ff}
.card p{margin:.4em 0;color:#445}
.card ul{margin:.4em 0;padding-left:1.1em}
.card li{margin:.2em 0}

.tag{display:inline-block;font-size:.72rem;font-weight:600;padding:2px 9px;border-radius:999px;background:#eef0ff;color:var(--accent);margin:2px 4px 2px 0}
.tag.g{background:#e7f7ee;color:var(--ok)} .tag.o{background:#fdf1e0;color:#b9791f} .tag.p{background:#f0ecfe;color:#7c3aed} .tag.b{background:#e8f0ff;color:#2563eb}

/* Callouts */
.callout{border-left:4px solid var(--accent);background:#f2f4ff;padding:12px 16px;border-radius:0 10px 10px 0;margin:16px 0}
.callout.warn{border-color:var(--warn);background:#fff8ec}
.callout.ok{border-color:var(--ok);background:#eefaf1}
.callout b{color:var(--marine)}

/* Tables */
table{width:100%;border-collapse:collapse;margin:14px 0;background:var(--panel);border:1px solid var(--line);border-radius:12px;overflow:hidden;font-size:.92rem}
th,td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--line);vertical-align:top}
th{background:#f2f4fb;font-size:.78rem;text-transform:uppercase;letter-spacing:.05em;color:#5a6486}
tr:last-child td{border-bottom:0}
td code{white-space:nowrap}

/* Mermaid */
.mermaid{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:18px;margin:16px 0;text-align:center;overflow:auto}

/* Hero (home) */
.hero{background:linear-gradient(135deg,#20296b,#3a49a6);color:#fff;border-radius:18px;padding:38px 40px;margin-bottom:24px}
.hero h1{color:#fff;font-size:2.3rem;margin:0 0 .2em}
.hero p{color:#d6dcff;font-size:1.12rem;max-width:760px}
.hero .pills{margin-top:18px}
.hero .pill{display:inline-block;background:rgba(255,255,255,.14);color:#fff;padding:6px 14px;border-radius:999px;font-size:.82rem;margin:4px 6px 0 0}
.foot{color:var(--muted);font-size:.82rem;margin-top:40px;border-top:1px solid var(--line);padding-top:16px}
.kbd{font-family:monospace;background:#eef0f7;border:1px solid #d6dae8;border-bottom-width:2px;border-radius:6px;padding:1px 6px;font-size:.85em}