/* Layout concept: a facility floor guide. Cool "cold aisle" paper, ink text,
   cable-blue for action, safety-yellow asset tags for hard facts (pay, cost, length). */
:root {
  --bg: #edf1f2;
  --surface: #ffffff;
  --ink: #12212b;
  --muted: #4f5f69;
  --line: #ccd5da;
  --accent: #1d5fd0;
  --accent-ink: #ffffff;
  --accent-soft: #dde8fa;
  --tag: #f3c437;
  --tag-ink: #1c1a10;
  --ok: #1f7a4d;
  --warn: #9a5b00;
  --rack: #1a2a34;
  --led: #4ade80;

  --font-display: "Barlow Condensed", "Arial Narrow", "Roboto Condensed", sans-serif;
  --font-body: "Public Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --step--1: 0.8125rem;
  --step-0: 1rem;
  --step-1: 1.1875rem;
  --step-2: 1.5rem;
  --step-3: 2.125rem;
  --step-4: clamp(2.5rem, 6vw, 4.25rem);

  --radius: 6px;
  --measure: 66ch;
  --wrap: 1120px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0d151a; --surface: #142028; --ink: #e2eaee; --muted: #97a7af; --line: #263741;
    --accent: #78aaff; --accent-ink: #0b1622; --accent-soft: #1b2c44; --tag: #e7b92c; --tag-ink: #1c1a10;
    --ok: #5fcf93; --warn: #f0b04a; --rack: #0a1116; --led: #4ade80; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0d151a; --surface: #142028; --ink: #e2eaee; --muted: #97a7af; --line: #263741;
  --accent: #78aaff; --accent-ink: #0b1622; --accent-soft: #1b2c44; --tag: #e7b92c; --tag-ink: #1c1a10;
  --ok: #5fcf93; --warn: #f0b04a; --rack: #0a1116; --led: #4ade80; color-scheme: dark;
}

html:has(> body.subpage) {
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
*, *::before, *::after { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; }
[hidden] { display: none !important; }
a { color: var(--accent); text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 2px; }
h1, h2, h3 { font-family: var(--font-display); line-height: 1.05; text-wrap: balance; margin: 0; letter-spacing: 0.005em; }
h1 { font-size: var(--step-4); font-weight: 700; }
h2 { font-size: var(--step-3); font-weight: 700; }
h3 { font-size: var(--step-2); font-weight: 600; }
p { margin: 0; }

.wrap {
  max-width: var(--wrap);
  margin-inline: auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}

/* Header */
body::before {
  content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px);
  z-index: 10; background: var(--surface);
}
.site-header {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 9;
  background: var(--surface); border-bottom: 1px solid var(--line);
}
.site-header .wrap { display: flex; align-items: center; gap: 20px; padding-block: 10px; flex-wrap: wrap; }
.brand {
  display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink);
  font-family: var(--font-display); font-weight: 700; font-size: 1.45rem; letter-spacing: 0.02em; text-transform: uppercase;
}
.brand-mark { display: grid; gap: 2px; width: 18px; }
.brand-mark span { display: block; height: 4px; background: var(--ink); border-radius: 1px; position: relative; }
.brand-mark span::after { content: ""; position: absolute; right: 2px; top: 1px; width: 2px; height: 2px; background: var(--led); }
.site-nav { margin-left: auto; min-width: 0; overflow-x: auto; }
.site-nav ul { list-style: none; display: flex; gap: 4px; margin: 0; padding: 0; white-space: nowrap; }
.site-nav a {
  display: block; padding: 6px 10px; border-radius: var(--radius); color: var(--ink); text-decoration: none; font-size: 0.9375rem;
}
.site-nav a:hover { background: var(--accent-soft); }
.site-nav a[aria-current="page"] { background: var(--ink); color: var(--surface); }
@media (max-width: 720px) {
  .site-nav { margin-left: 0; width: 100%; }
}

/* Asset tag: hard facts */
.tag {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-mono); font-size: var(--step--1); font-weight: 500; letter-spacing: 0.04em; text-transform: uppercase;
  background: var(--tag); color: var(--tag-ink); padding: 2px 8px; border-radius: 3px; line-height: 1.5;
}
.tag.plain { background: transparent; color: var(--muted); border: 1px solid var(--line); }
.tag.ok { background: transparent; color: var(--ok); border: 1px solid currentColor; }
.tag.warn { background: transparent; color: var(--warn); border: 1px solid currentColor; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.eyebrow {
  font-family: var(--font-mono); font-size: var(--step--1); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted);
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font: 600 1rem/1 var(--font-body); padding: 12px 18px; border-radius: var(--radius);
  border: 2px solid var(--accent); background: var(--accent); color: var(--accent-ink); text-decoration: none; cursor: pointer;
}
.btn:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; color: var(--accent); }
.btn.small { padding: 8px 12px; font-size: 0.9375rem; }

/* Sections */
.section { padding-block: 56px; }
.section + .section { border-top: 1px solid var(--line); }
.section-head { display: grid; gap: 10px; margin-bottom: 28px; max-width: var(--measure); }
.lede { font-size: var(--step-1); color: var(--muted); max-width: 60ch; }

/* Hero */
.hero { padding-block: 48px 40px; }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); gap: 40px; align-items: center; }
.hero h1 { text-transform: uppercase; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero-copy { display: grid; gap: 18px; min-width: 0; }
.hero-actions { display: flex; gap: 10px; flex-wrap: wrap; }
@media (max-width: 820px) { .hero .wrap { grid-template-columns: 1fr; } .rack { display: none; } }

/* Rack illustration: a 12U elevation */
.rack {
  background: var(--rack); border-radius: 8px; padding: 14px 14px 18px; display: grid; gap: 4px;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.06);
}
.rack-label { font-family: var(--font-mono); font-size: 11px; color: #9fb3bd; letter-spacing: 0.08em; display: flex; justify-content: space-between; margin-bottom: 6px; }
.ru { display: grid; grid-template-columns: 22px 1fr; gap: 8px; align-items: center; }
.ru b { font: 500 10px/1 var(--font-mono); color: #6f8792; text-align: right; }
.unit { height: 18px; border-radius: 2px; background: #22343f; position: relative; display: flex; align-items: center; gap: 4px; padding-inline: 8px; }
.unit.tall { height: 40px; }
.unit.empty { background: transparent; border: 1px dashed #2f4450; }
.unit i { width: 4px; height: 4px; border-radius: 50%; background: var(--led); opacity: 0.85; }
.unit i.amber { background: #f5b83d; }
.unit .vent { flex: 1; height: 6px; background: repeating-linear-gradient(90deg, #2e4552 0 3px, transparent 3px 6px); }
@media (prefers-reduced-motion: no-preference) {
  .unit i.blink { animation: blink 2.4s infinite steps(2, jump-none); }
  .unit i.blink.d2 { animation-delay: 0.7s; }
  .unit i.blink.d3 { animation-delay: 1.3s; }
}
@keyframes blink { 50% { opacity: 0.25; } }

/* Grid cards */
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px;
  display: grid; gap: 12px; align-content: start; min-width: 0;
}
.card h3 { font-size: 1.45rem; }
.card p { color: var(--muted); }
.card-foot { margin-top: 4px; display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }

/* Route steps (a real sequence) */
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; counter-reset: s; }
.steps li { counter-increment: s; display: grid; grid-template-columns: 56px minmax(0, 1fr); gap: 16px; padding-block: 18px; border-top: 1px solid var(--line); }
.steps li::before {
  content: counter(s, decimal-leading-zero); font: 700 2rem/1 var(--font-display); color: var(--accent);
}
.steps h3 { font-size: 1.35rem; margin-bottom: 4px; }
.steps p { color: var(--muted); max-width: var(--measure); }

/* Quiz */
.finder {
  background: var(--surface); border: 1px solid var(--line); border-radius: 10px; overflow: hidden;
}
.finder-head { background: var(--ink); color: var(--surface); padding: 16px 20px; display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.finder-head h2 { font-size: 1.75rem; }
.finder-head .eyebrow { color: inherit; opacity: 0.75; }
.finder form { padding: 20px; display: grid; gap: 20px; }
.q { display: grid; gap: 8px; border: 0; padding: 0; margin: 0; min-width: 0; }
.q legend, .q > label { font-weight: 600; padding: 0; margin-bottom: 6px; }
.opts { display: flex; flex-wrap: wrap; gap: 8px; }
.opt { position: relative; }
.opt input { position: absolute; opacity: 0; inset: 0; }
.opt span {
  display: block; padding: 9px 14px; border: 1.5px solid var(--line); border-radius: var(--radius); cursor: pointer; background: var(--bg);
}
.opt input:checked + span { border-color: var(--accent); background: var(--accent-soft); color: var(--ink); font-weight: 600; }
.opt input:focus-visible + span { outline: 3px solid var(--accent); outline-offset: 2px; }
select, input[type="email"], input[type="text"], input[type="search"] {
  font: inherit; color: var(--ink); background: var(--bg); border: 1.5px solid var(--line); border-radius: var(--radius);
  padding: 10px 12px; max-width: 100%; min-width: 0;
}
select:focus, input:focus { border-color: var(--accent); outline: none; box-shadow: 0 0 0 3px var(--accent-soft); }
.finder-actions { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.form-note { font-size: var(--step--1); color: var(--muted); }
.results { border-top: 1px solid var(--line); padding: 20px; display: grid; gap: 16px; background: var(--bg); }
.results h3 { font-size: 1.6rem; }
.match { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; display: grid; gap: 10px; }
.match .why { font-size: 0.9375rem; color: var(--muted); }
.match-top { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; align-items: baseline; }
.match h4 { margin: 0; font-size: 1.15rem; }

/* Directory */
.filters { display: flex; flex-wrap: wrap; gap: 12px; align-items: end; margin-bottom: 20px; }
.filters label { display: grid; gap: 4px; font-size: var(--step--1); font-weight: 600; color: var(--muted); }
.count { font-family: var(--font-mono); font-size: var(--step--1); color: var(--muted); }
.prog { display: grid; gap: 10px; }
.prog .where { font-size: 0.9375rem; color: var(--muted); }
.facts { display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 4px 14px; margin: 0; font-size: 0.9375rem; }
.facts dt { font-family: var(--font-mono); font-size: var(--step--1); text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); padding-top: 2px; }
.facts dd { margin: 0; }

/* Article */
.article { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 48px; align-items: start; padding-block: 40px 64px; }
.article-body { display: grid; gap: 22px; min-width: 0; max-width: var(--measure); }
.article-body h2 { font-size: 2rem; margin-top: 18px; }
.article-body h3 { font-size: 1.4rem; margin-top: 6px; }
.article-body ul, .article-body ol { margin: 0; padding-left: 1.25rem; display: grid; gap: 6px; }
.aside { position: sticky; top: calc(env(safe-area-inset-top, 0px) + 80px); display: grid; gap: 16px; }
@media (max-width: 900px) { .article { grid-template-columns: minmax(0, 1fr); } .aside { position: static; } }
.aside { min-width: 0; }
.factbox { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; display: grid; gap: 12px; }
.factbox h2, .factbox h3 { font-size: 1.3rem; margin: 0; }
.callout { border-left: 4px solid var(--tag); background: var(--surface); padding: 14px 16px; border-radius: 0 var(--radius) var(--radius) 0; }
.callout.unclear { border-left-color: var(--warn); }
.page-head { padding-block: 40px 8px; display: grid; gap: 14px; }
.page-head h1 { font-size: clamp(2.25rem, 5vw, 3.5rem); }
.updated { font-family: var(--font-mono); font-size: var(--step--1); color: var(--muted); }
.crumbs { font-size: var(--step--1); color: var(--muted); }
.crumbs a { color: inherit; }

.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: 0.9375rem; }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-family: var(--font-mono); font-size: var(--step--1); text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); font-weight: 500; }
tr:last-child td { border-bottom: 0; }
td.num { font-variant-numeric: tabular-nums; white-space: nowrap; }

details.faq { border-top: 1px solid var(--line); padding-block: 14px; }
details.faq summary { cursor: pointer; font-weight: 600; font-size: 1.05rem; }
details.faq p { margin-top: 8px; color: var(--muted); }

/* Signup band */
.signup { background: var(--ink); color: var(--surface); }
.signup .wrap { padding-block: 44px; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 32px; align-items: center; }
.signup h2 { color: var(--surface); }
.signup p { opacity: 0.85; }
.signup form { display: grid; gap: 10px; }
.signup .row { display: flex; gap: 8px; flex-wrap: wrap; }
.signup .row > * { flex: 1 1 180px; }
.signup select, .signup input[type="email"] { background: var(--surface); color: var(--ink); border-color: transparent; }
.signup .consent { display: flex; gap: 8px; align-items: flex-start; font-size: var(--step--1); opacity: 0.9; }
.signup .consent input { margin-top: 4px; }
.signup .msg { font-size: 0.9375rem; }
@media (max-width: 820px) { .signup .wrap { grid-template-columns: 1fr; } }

.site-footer { padding-block: 32px 48px; font-size: var(--step--1); color: var(--muted); }
.site-footer .wrap { display: grid; gap: 12px; }
.site-footer nav { display: flex; gap: 16px; flex-wrap: wrap; }
.site-footer a { color: inherit; }
.sources { font-size: var(--step--1); color: var(--muted); display: grid; gap: 6px; }
.sources ol { padding-left: 1.2rem; margin: 0; display: grid; gap: 4px; }
.sources a { word-break: break-word; }

/* Inline sign-up (finder results, guide pages) */
.inline-signup { background: var(--surface); border: 1.5px solid var(--accent); border-radius: var(--radius); padding: 16px; display: grid; gap: 10px; }
.inline-signup h4 { margin: 0; font-size: 1.05rem; }
.inline-signup .row { display: flex; gap: 8px; flex-wrap: wrap; }
.inline-signup input[type="email"] { flex: 1 1 200px; }
.inline-signup .consent { display: flex; gap: 8px; align-items: flex-start; font-size: var(--step--1); color: var(--muted); }
.inline-signup .consent input { margin-top: 4px; }
.inline-signup .msg { font-size: 0.9375rem; }
.today { font-size: 0.9375rem; }
.match.vet { border-color: var(--ok); }
.checklist { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.checklist li { display: grid; grid-template-columns: 22px minmax(0, 1fr); gap: 10px; align-items: start; }
.checklist li::before { content: ""; width: 16px; height: 16px; border: 2px solid var(--accent); border-radius: 3px; margin-top: 4px; }
.signup a { color: inherit; }
.footer-links { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 180px), 1fr)); gap: 6px 16px; }
.article-body > *, .section-head > *, .grid > * { min-width: 0; }

/* Compact weekly-alerts form near the top of pages */
.top-signup { display: grid; gap: 8px; max-width: 520px; background: var(--surface); border: 1px solid var(--line); border-left: 4px solid var(--tag); border-radius: var(--radius); padding: 12px 14px; }
.top-signup-title { font-weight: 600; font-size: 0.9375rem; }
.top-signup .row { display: flex; gap: 8px; flex-wrap: wrap; }
.top-signup input[type="email"] { flex: 1 1 200px; padding-block: 8px; }
.top-signup .consent { display: flex; gap: 8px; align-items: flex-start; font-size: var(--step--1); color: var(--muted); }
.top-signup .consent input { margin-top: 4px; }
.top-signup .msg { font-size: var(--step--1); }
.top-signup .msg:empty { display: none; }
.hero-side { display: grid; gap: 16px; min-width: 0; align-content: center; }
.hero-side .top-signup { max-width: none; }
.top-signup.mobile-only { display: none; margin-top: 16px; }
@media (max-width: 820px) {
  .hero-side { display: none; }
  .top-signup.mobile-only { display: grid; }
}