:root{
  /* "SSH anomaly" identity: ocean blue (currents / cyclonic) + warm
     amber (anticyclonic / warm-core) over a sea-glass paper. */
  --paper:#f1f6fa; --paper-deep:#e2ecf3; --ink:#0e2733; --ink-soft:#294753;
  --muted:#5c7986; --accent:#1183b8; --accent-deep:#0c6191; --warm:#e07a3c;
  --rule:#d5e5ee; --code:#e6f1f7; --sidebar:#e5eff6;
  --ui:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,"Book Antiqua",Georgia,Cambria,serif;
  --nav-w:290px; --readw:748px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font:19px/1.75 var(--serif);
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
.ui{font-family:var(--ui)}
a{color:var(--accent);text-decoration:none}
a:hover{color:var(--accent-deep);text-decoration:underline;text-underline-offset:2px}
h1,h2,h3,h4{color:#142c3a;line-height:1.25;font-weight:600;letter-spacing:-.005em}
code,kbd{font-family:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;font-size:.8em;
  background:var(--code);padding:.12em .4em;border-radius:4px;border:1px solid var(--rule)}
pre{background:#f7fcfe;border:1px solid var(--rule);border-left:3px solid var(--accent);
  padding:15px 18px;border-radius:6px;overflow:auto}
pre code{background:none;border:0;padding:0;font-size:.82em;line-height:1.65;color:#2c4250}

/* ---------- layout ---------- */
.layout{display:grid;grid-template-columns:var(--nav-w) minmax(0,1fr);max-width:1300px;margin:0 auto}

/* ---------- sidebar (the spine) ---------- */
.sidebar{position:sticky;top:0;height:100vh;overflow-y:auto;background:var(--sidebar);
  border-right:1px solid var(--rule);padding:22px 16px 44px}
.side-brand{padding:4px 8px 14px;border-bottom:1px solid var(--rule);margin-bottom:12px}
.side-brand a{display:flex;align-items:center;gap:10px;color:#142c3a;font-weight:700;font-size:1.4rem;letter-spacing:.02em}
.side-brand a:hover{text-decoration:none}
.side-brand .mark{display:inline-flex;align-items:center;justify-content:center;width:31px;height:31px;
  border-radius:8px;background:var(--accent);color:#fff;font-size:1.1rem;box-shadow:0 1px 3px rgba(12,97,145,.42)}
.side-brand small{display:block;color:var(--muted);font-size:.72rem;margin-top:7px;letter-spacing:.015em}
.side-search{margin:2px 0 4px}
.side-search input{width:100%;padding:8px 10px;border:1px solid var(--rule);border-radius:7px;
  font-family:var(--ui);font-size:.84rem;background:#f9fdfe;color:var(--ink)}
.side-search input:focus{outline:2px solid #cadfef;border-color:var(--accent)}
.side-h{font-size:.68rem;text-transform:uppercase;letter-spacing:.11em;color:var(--muted);
  margin:18px 8px 6px;font-weight:700}
.sidebar ul{list-style:none;margin:0;padding:0}
.sidebar li a{display:block;padding:6px 11px;border-radius:7px;color:var(--ink-soft);font-size:.92rem;line-height:1.35}
.sidebar li a:hover{background:#d6e8f2;text-decoration:none;color:#142c3a}
.sidebar li.active a{background:var(--accent);color:#fff;box-shadow:0 1px 3px rgba(12,97,145,.35)}

/* ---------- content ---------- */
main{min-width:0;padding:0 40px}
.page{max-width:var(--readw);margin:0 auto;padding:40px 0 60px}
.banner{margin-bottom:26px;padding-bottom:18px;border-bottom:2px solid var(--rule);position:relative}
.banner:after{content:"";position:absolute;left:0;bottom:-2px;width:66px;height:2px;background:var(--warm)}
.banner h1{margin:.05em 0;font-size:2.15rem}
.lede{color:var(--muted);font-size:1.05rem;font-style:italic;margin:.4em 0 0}
.pill{display:inline-block;font-family:var(--ui);background:var(--paper-deep);color:var(--accent-deep);
  border:1px solid var(--rule);border-radius:999px;padding:2px 13px;font-size:.74rem;letter-spacing:.03em}
.content{font-size:1.02rem}
.content>p{margin:1em 0}
.content h2{margin:1.9em 0 .55em;padding-bottom:.25em;border-bottom:1px solid var(--rule);font-size:1.5rem}
.content h3{margin:1.5em 0 .4em;font-size:1.2rem;color:var(--accent-deep)}
.content h4{margin:1.2em 0 .3em;font-size:1.02rem}
.content ul,.content ol{padding-left:1.35em}
.content li{margin:.3em 0}
.content blockquote{border-left:3px solid var(--warm);margin:1.2em 0;padding:.35em 1.1em;
  color:var(--muted);background:#e8f2f8;font-style:italic;border-radius:0 6px 6px 0}
.content img{max-width:100%;border-radius:6px}
.content hr{border:0;border-top:1px solid var(--rule);margin:2em 0}

/* tables (UI font for density) */
.content table,table.cli{border-collapse:collapse;width:100%;margin:1.2em 0;font-family:var(--ui);
  font-size:.88rem;display:block;overflow:auto}
.content th,.content td,table.cli th,table.cli td{border:1px solid var(--rule);padding:8px 11px;
  text-align:left;vertical-align:top}
.content thead th,table.cli thead th{background:var(--paper-deep);color:var(--accent-deep);font-weight:600}
.content tbody tr:nth-child(even),table.cli tbody tr:nth-child(even){background:#ebf4f9}

/* cards */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(212px,1fr));gap:15px;margin:1.4em 0}
.card{display:block;background:#f9fdfe;border:1px solid var(--rule);border-radius:10px;padding:15px 17px;
  transition:box-shadow .16s,transform .16s,border-color .16s}
.card:hover{box-shadow:0 8px 22px rgba(43,44,46,.10);transform:translateY(-2px);border-color:#bdd6e6;text-decoration:none}
.card h3{margin:0 0 .35em;color:var(--accent-deep);font-size:1.06rem}
.card p{margin:0;color:var(--muted);font-size:.84rem;font-family:var(--ui);line-height:1.45}

/* prev/next pager */
.pager{display:flex;gap:16px;margin:48px 0 6px}
.pager a{flex:1;display:block;padding:13px 16px;border:1px solid var(--rule);border-radius:9px;background:#f9fdfe}
.pager a:hover{border-color:var(--accent);text-decoration:none;background:#fff}
.pager .next{text-align:right}
.pager .lbl{display:block;font-size:.68rem;text-transform:uppercase;letter-spacing:.09em;color:var(--muted)}
.pager .ttl{font-weight:600;color:var(--accent-deep)}
.pager>span{flex:1}

/* table of contents — a horizontal outline above the page content */
.toc{margin:0 0 30px;padding:13px 20px 15px;background:var(--paper-deep);
  border:1px solid var(--rule);border-left:3px solid var(--accent);border-radius:8px}
.toc-h{font-family:var(--ui);font-size:.66rem;text-transform:uppercase;letter-spacing:.11em;color:var(--muted);font-weight:700;margin:0 0 6px}
.toc ul{list-style:none;margin:0;padding-left:14px}
.toc>ul{padding-left:0;columns:2;column-gap:36px}
.toc li{break-inside:avoid}
.toc a{font-family:var(--ui);color:var(--accent);display:block;padding:3px 0;font-size:.82rem;line-height:1.35}
.toc a:hover{color:var(--accent-deep);text-decoration:underline}
.toc a.here{color:var(--accent-deep);font-weight:600}

.pagefoot{margin-top:36px;padding-top:14px;border-top:1px solid var(--rule);color:var(--muted);font-size:.8rem}
.overview{margin-top:.4em}

/* mobile floating menu button */
.menu-fab{display:none;position:fixed;left:14px;top:14px;z-index:30;width:44px;height:44px;border:0;
  border-radius:10px;background:var(--accent);color:#fff;font-size:1.3rem;cursor:pointer;box-shadow:0 3px 10px rgba(0,0,0,.22)}

@media (max-width:820px){
  .layout,.layout.with-toc{grid-template-columns:1fr}
  main{padding:0 22px}
  .menu-fab{display:block}
  .sidebar{position:fixed;left:0;top:0;width:290px;transform:translateX(-100%);transition:transform .22s;z-index:25;
    box-shadow:0 10px 40px rgba(0,0,0,.18)}
  .sidebar.open{transform:none}
  .page{padding-top:66px}
  .pager{flex-direction:column}
  .toc>ul{columns:1}
}