/* obi-docs — operator's field manual
   aesthetic: editorial serif display, institutional sans body, terminal mono.
   near-black warm base, single electric-lime accent, razor borders. */

:root {
  --ink:        #e9e6de;
  --ink-dim:    #a6a69f;
  --ink-ghost:  #6b6c68;
  --paper:      #0b0d0e;
  --panel:      #121315;
  --panel-raised: #181a1d;
  --rule:       #24272a;
  --rule-hi:    #33373b;
  --signal:     #d6ff2d;
  --signal-ink: #1d1f00;
  --amber:      #f4a35b;
  --salmon:     #ff8d76;
  --azure:      #7ab6ff;
  --lilac:      #b79bff;

  --font-display: 'Fraunces', 'Iowan Old Style', 'Palatino', serif;
  --font-body:    'IBM Plex Sans', 'Helvetica Neue', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', 'Menlo', monospace;

  --side-w: 280px;
  --toc-w:  232px;
  --topbar-h: 56px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--paper); color: var(--ink);
  font-family: var(--font-body); font-weight: 400; line-height: 1.58;
  -webkit-font-smoothing: antialiased; font-feature-settings: 'ss01','ss02','ss03','cv11';
}
body { min-height: 100vh; overflow-x: hidden; }

a { color: inherit; text-decoration: none; }
a:hover { color: var(--signal); }

/* subtle film grain overlay */
.noise {
  position: fixed; inset: 0; pointer-events: none; z-index: 1; opacity: .035;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/></filter><rect width='200' height='200' filter='url(%23n)' opacity='0.9'/></svg>");
  mix-blend-mode: overlay;
}

/* topbar */
.topbar {
  position: sticky; top: 0; z-index: 40;
  height: var(--topbar-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 28px;
  background: rgba(11,13,14,.82); backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--rule);
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand .mark { width: 22px; height: 22px; color: var(--signal); }
.brand-text { font-family: var(--font-display); font-weight: 500; font-size: 17px; letter-spacing: -.01em; }
.brand-fig {
  font-family: var(--font-display); font-weight: 700;
  font-style: italic; font-variation-settings: "SOFT" 30, "WONK" 1;
  color: var(--signal);
  margin-right: 1px;
}
.topnav { display: flex; align-items: center; gap: 22px; }
.topnav a { font-family: var(--font-mono); font-size: 12px; color: var(--ink-dim);
  letter-spacing: .02em; text-transform: lowercase; }
.topnav a.active, .topnav a:hover { color: var(--ink); }
.topnav a.download {
  display: inline-flex; gap: 6px; align-items: center;
  padding: 6px 10px; border: 1px solid var(--rule);
  background: var(--panel);
}
.topnav a.download:hover { border-color: var(--signal); color: var(--signal); }

/* shell */
.shell {
  display: grid;
  grid-template-columns: var(--side-w) minmax(0, 1fr) var(--toc-w);
  min-height: calc(100vh - var(--topbar-h));
}

/* sidebar */
.sidebar {
  position: sticky; top: var(--topbar-h); align-self: start;
  height: calc(100vh - var(--topbar-h));
  overflow-y: auto;
  border-right: 1px solid var(--rule);
  padding: 28px 20px 40px 28px;
}
.side-header { display: flex; flex-direction: column; gap: 4px; margin-bottom: 24px; }
.kicker {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--ink-dim);
}
.caption { font-family: var(--font-mono); font-size: 10.5px; color: var(--ink-ghost); }

#sidenav .group { margin-bottom: 22px; }
#sidenav .group-label {
  font-family: var(--font-display); font-style: italic; font-variation-settings: "SOFT" 30;
  font-weight: 600; font-size: 13px; letter-spacing: -.01em;
  color: var(--ink-dim); padding: 4px 10px; margin-bottom: 6px;
  border-left: 1px solid var(--rule);
}
#sidenav a {
  display: flex; align-items: center; gap: 8px;
  padding: 5px 10px; margin: 1px 0;
  font-family: var(--font-mono); font-size: 12.5px;
  color: var(--ink-dim); border-left: 1px solid transparent;
  transition: color 120ms, border-color 120ms, background 120ms;
}
#sidenav a:hover { color: var(--ink); background: var(--panel); }
#sidenav a.active { color: var(--signal); border-left-color: var(--signal); background: rgba(214,255,45,.04); }
#sidenav a .dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--ink-ghost);
  display: inline-block; flex: none;
}
#sidenav a.mutating .dot { background: var(--amber); }
#sidenav a.admin .dot    { background: var(--salmon); }

/* main */
main { padding: 56px clamp(24px, 5vw, 80px) 140px; min-width: 0; }
#content { max-width: 860px; }

h1, h2, h3 { font-family: var(--font-display); color: var(--ink); letter-spacing: -.01em; }
h1 { font-weight: 500; font-size: clamp(38px, 4.6vw, 56px); line-height: 1.04;
     font-variation-settings: "opsz" 144, "SOFT" 20; margin: 0 0 8px; }
h2 { font-weight: 500; font-size: 26px; line-height: 1.18; margin: 56px 0 14px;
     font-variation-settings: "opsz" 72, "SOFT" 10;
     padding-top: 14px; border-top: 1px solid var(--rule); }
h3 { font-weight: 500; font-size: 17.5px; margin: 30px 0 10px; letter-spacing: -.005em; }
p  { color: var(--ink); margin: 0 0 14px; }
p.lede { font-size: 17.5px; color: var(--ink-dim); max-width: 64ch; }

code {
  font-family: var(--font-mono); font-size: .88em;
  background: var(--panel); padding: 1.5px 5px; border-radius: 3px;
  border: 1px solid var(--rule); color: var(--ink);
}

pre {
  position: relative;
  margin: 10px 0 22px;
  padding: 18px 18px 18px 20px;
  background: var(--panel); border: 1px solid var(--rule); border-radius: 4px;
  font-family: var(--font-mono); font-size: 12.5px; line-height: 1.62;
  overflow: auto; color: var(--ink);
}
pre .copy {
  position: absolute; top: 10px; right: 10px;
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .08em;
  background: var(--panel-raised); border: 1px solid var(--rule);
  color: var(--ink-dim); cursor: pointer; padding: 4px 8px;
  text-transform: uppercase;
}
pre .copy:hover { color: var(--signal); border-color: var(--signal); }
pre .copy.ok    { color: var(--signal); border-color: var(--signal); }

pre .k { color: var(--lilac); }
pre .s { color: var(--amber); }
pre .n { color: var(--azure); }
pre .b { color: var(--salmon); }
pre .c { color: var(--ink-ghost); }

.ep-hero {
  display: flex; flex-direction: column; gap: 18px;
  padding: 34px 34px 30px; margin: 0 0 24px;
  background:
    radial-gradient(80% 140% at 0% 0%, rgba(214,255,45,0.06), transparent 60%),
    var(--panel);
  border: 1px solid var(--rule);
  border-radius: 6px; position: relative; overflow: hidden;
}
.ep-hero::before {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background-image: repeating-linear-gradient(0deg, rgba(255,255,255,.012) 0 1px, transparent 1px 3px);
}
.ep-crumb {
  font-family: var(--font-mono); font-size: 11px; color: var(--ink-ghost);
  letter-spacing: .04em; text-transform: uppercase;
}
.ep-title {
  display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap;
  font-family: var(--font-mono); font-size: 30px; color: var(--ink); letter-spacing: -.005em;
}
.ep-title .slash { color: var(--signal); font-weight: 500; }
.ep-title .verb { font-family: var(--font-display); font-style: italic; font-weight: 600;
  font-variation-settings: "SOFT" 60, "WONK" 1; color: var(--ink-dim); font-size: 20px; }
.ep-sum { color: var(--ink-dim); max-width: 70ch; margin-top: 2px; font-size: 15px; line-height: 1.5; }

.tag {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .06em;
  padding: 3px 8px; border: 1px solid var(--rule); background: var(--panel-raised);
  color: var(--ink-dim); text-transform: uppercase;
}
.tag.admin { color: var(--salmon); border-color: rgba(255,141,118,.4); }
.tag.std   { color: var(--azure);  border-color: rgba(122,182,255,.4); }
.tag.mut   { color: var(--amber);  border-color: rgba(244,163,91,.4); }
.tag.ro    { color: var(--ink-dim); }
.tag.req   { color: var(--signal); border-color: rgba(214,255,45,.4); }

.latency-strip {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1px; border: 1px solid var(--rule); background: var(--rule);
  border-radius: 4px; overflow: hidden; margin-top: 6px;
}
.lat-cell { background: var(--panel-raised); padding: 12px 14px; }
.lat-cell .k {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .08em;
  text-transform: uppercase; color: var(--ink-ghost);
}
.lat-cell .v {
  font-family: var(--font-display); font-weight: 600; font-style: italic;
  font-variation-settings: "SOFT" 40;
  font-size: 24px; letter-spacing: -.01em; color: var(--ink);
  display: flex; align-items: baseline; gap: 6px;
}
.lat-cell .v.ok { color: var(--signal); }
.lat-cell .v .u { font-family: var(--font-mono); font-size: 11.5px;
  color: var(--ink-dim); font-style: normal; font-weight: 400; letter-spacing: .04em;
  text-transform: uppercase; }
.lat-cell .note {
  font-family: var(--font-mono); font-size: 10px; color: var(--ink-ghost);
  letter-spacing: .02em; margin-top: 2px; line-height: 1.3;
}

.params {
  width: 100%;
  border: 1px solid var(--rule);
  border-collapse: collapse;
  font-size: 13.5px;
}
.params th, .params td {
  text-align: left; padding: 11px 14px; vertical-align: top;
  border-bottom: 1px solid var(--rule);
}
.params th {
  font-family: var(--font-mono); font-size: 10.5px; color: var(--ink-ghost);
  letter-spacing: .08em; text-transform: uppercase; font-weight: 500;
  background: var(--panel);
}
.params td.p { font-family: var(--font-mono); color: var(--signal); white-space: nowrap; }
.params td.t { font-family: var(--font-mono); color: var(--ink-dim); font-size: 12px; }
.params td.d { color: var(--ink); }
.params tr:last-child td { border-bottom: none; }
.params .req-dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--signal);
  display: inline-block; margin-right: 6px; vertical-align: middle;
}
.params .opt-dot {
  width: 6px; height: 6px; border-radius: 50%; background: transparent;
  border: 1px solid var(--ink-ghost);
  display: inline-block; margin-right: 6px; vertical-align: middle;
}

.note {
  border-left: 2px solid var(--signal);
  padding: 10px 14px;
  background: rgba(214,255,45,.03);
  color: var(--ink-dim); font-size: 14px; line-height: 1.55;
  margin: 12px 0 24px;
}
.note b { color: var(--ink); font-weight: 500; }

.toc {
  position: sticky; top: var(--topbar-h); align-self: start;
  height: calc(100vh - var(--topbar-h)); overflow-y: auto;
  padding: 64px 28px 60px 0; border-left: 1px solid var(--rule);
}
.toc .toc-title {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--ink-ghost); padding-left: 16px;
  margin-bottom: 10px;
}
.toc a {
  display: block; padding: 4px 16px;
  font-family: var(--font-mono); font-size: 11.5px;
  color: var(--ink-ghost); border-left: 1px solid var(--rule);
}
.toc a.active { color: var(--signal); border-left-color: var(--signal); }
.toc a:hover { color: var(--ink); }

.hero {
  padding: 36px 40px 40px;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background:
    radial-gradient(60% 100% at 0% 0%, rgba(214,255,45,.08), transparent 55%),
    radial-gradient(40% 80% at 100% 0%, rgba(122,182,255,.04), transparent 60%),
    var(--panel);
  margin-bottom: 32px; position: relative; overflow: hidden;
}
.hero::after {
  content: 'OBI/01'; position: absolute; right: -12px; bottom: -36px;
  font-family: var(--font-display); font-weight: 700; font-size: 180px;
  color: var(--ink); opacity: .028; letter-spacing: -.02em;
  font-variation-settings: "SOFT" 80, "WONK" 1;
}
.hero .over {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--ink-dim); margin-bottom: 18px;
}
.hero h1 { max-width: 22ch; margin-bottom: 14px; }
.hero h1 em { font-style: italic; color: var(--signal);
  font-variation-settings: "SOFT" 80, "WONK" 1; }

.meta-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1px; background: var(--rule); border: 1px solid var(--rule);
  margin: 20px 0 24px;
}
.meta-grid > div { background: var(--panel-raised); padding: 14px 16px; }
.meta-grid .mk {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--ink-ghost); margin-bottom: 5px;
}
.meta-grid .mv { font-family: var(--font-mono); font-size: 12.5px; color: var(--ink); }

.ep-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px; margin: 14px 0 30px;
}
.ep-card {
  border: 1px solid var(--rule); background: var(--panel);
  padding: 16px 18px; border-radius: 4px;
  display: flex; flex-direction: column; gap: 6px; transition: border-color 120ms, transform 160ms;
}
.ep-card:hover { border-color: var(--signal); transform: translateY(-1px); }
.ep-card .name { font-family: var(--font-mono); font-size: 14.5px; color: var(--ink); }
.ep-card .name .slash { color: var(--signal); }
.ep-card .sum { font-size: 12.5px; color: var(--ink-dim); line-height: 1.5; }
.ep-card .row { display: flex; gap: 8px; margin-top: 6px; }

.rows {
  display: grid;
  grid-template-columns: 1fr;
  border: 1px solid var(--rule); border-radius: 4px; background: var(--panel);
}
.rows > .row {
  display: grid; grid-template-columns: 200px 1fr; gap: 20px;
  padding: 14px 20px; border-top: 1px solid var(--rule);
}
.rows > .row:first-child { border-top: none; }
.rows .reason {
  font-family: var(--font-mono); font-size: 12.5px; color: var(--signal);
}
.rows .desc { color: var(--ink-dim); font-size: 14px; }

.footer {
  border-top: 1px solid var(--rule); margin-top: 60px; padding-top: 20px;
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--font-mono); font-size: 11px; color: var(--ink-ghost);
}
.footer a { color: var(--ink-dim); }
.footer a:hover { color: var(--signal); }

[id^="sec-"] { scroll-margin-top: calc(var(--topbar-h) + 24px); }

@media (max-width: 1180px) {
  .shell { grid-template-columns: var(--side-w) minmax(0, 1fr); }
  .toc { display: none; }
}
@media (max-width: 820px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; border-right: none; border-bottom: 1px solid var(--rule); }
  main { padding: 32px 20px 80px; }
  .topnav a[href="#/events"], .topnav a[href="#/errors"] { display: none; }
  h1 { font-size: 38px; }
  .ep-title { font-size: 22px; }
}

.skel {
  height: 12px; background: linear-gradient(90deg, var(--panel) 0%, var(--panel-raised) 50%, var(--panel) 100%);
  background-size: 200% 100%; animation: shimmer 1.4s infinite linear;
  border-radius: 3px; margin: 8px 0;
}
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }