/* C.A.T.S. — dark technical.
   Palette validated against surface #12151a: all six data-viz checks pass. */

:root {
  --plane: #0d0f13;
  --surface: #12151a;
  --surface-2: #171b22;
  --ink: #ffffff;
  --ink-2: #c3c2b7;
  --muted: #898781;
  --line: #22262e;
  --axis: #383c44;
  --accent: #3987e5;
  --accent-2: #d95926;
  --good: #0ca30c;
  --warn: #fab219;
  --crit: #d03b3b;
  --radius: 8px;
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--plane);
  color: var(--ink-2);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", sans-serif;
  -webkit-text-size-adjust: 100%;
}

/* ---------- chrome ---------- */

.top {
  position: sticky; top: 0; z-index: 20;
  display: flex; flex-wrap: wrap; gap: 12px 24px;
  align-items: center; justify-content: space-between;
  padding: 12px 24px;
  background: rgba(13, 15, 19, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: baseline; gap: 10px; text-decoration: none; }
.brand b { color: var(--ink); font-size: 18px; letter-spacing: 0.06em; }
.brand span { color: var(--muted); font-size: 12px; }
.top nav { display: flex; flex-wrap: wrap; gap: 4px; }
.top nav a {
  color: var(--ink-2); text-decoration: none; font-size: 14px;
  padding: 6px 12px; border-radius: 6px;
}
.top nav a:hover { background: var(--surface-2); color: var(--ink); }
.top nav a.on { background: var(--accent); color: #fff; }

main { max-width: 860px; margin: 0 auto; padding: 32px 24px 72px; }

h1 { color: var(--ink); font-size: clamp(28px, 5vw, 40px); line-height: 1.15; margin: 0 0 8px; letter-spacing: -0.01em; }
h2 { color: var(--ink); font-size: 22px; margin: 44px 0 12px; padding-top: 20px; border-top: 1px solid var(--line); }
h3 { color: var(--ink); font-size: 16px; margin: 0 0 6px; }
.lede { font-size: 19px; color: var(--ink-2); margin: 0 0 8px; }
p { margin: 0 0 14px; }
strong { color: var(--ink); }
em { color: var(--ink); font-style: italic; }
code { font-family: ui-monospace, "Cascadia Code", Consolas, monospace; font-size: 0.9em; color: var(--accent); }
ul { padding-left: 20px; }
li { margin-bottom: 6px; }

/* ---------- hero ---------- */

.hero { margin: 20px 0 8px; }
.hero img {
  display: block; width: 100%; height: auto;
  border: 1px solid var(--line); border-radius: var(--radius);
}

/* ---------- rendered design documents ---------- */

main a { color: var(--accent); text-decoration: none; border-bottom: 1px solid rgba(57,135,229,.35); }
main a:hover { color: #6da7ec; border-bottom-color: #6da7ec; }

.doc h1 { margin-bottom: 14px; }
.doc h2 { font-size: 21px; }
.doc h3 { font-size: 17px; margin: 26px 0 8px; color: var(--ink); }
.doc h4 { font-size: 15px; margin: 20px 0 6px; color: var(--ink-2); text-transform: uppercase; letter-spacing: .06em; }

.doc blockquote {
  margin: 18px 0; padding: 14px 18px;
  background: var(--surface); border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0; color: var(--ink-2);
}
.doc blockquote p:last-child, .doc blockquote table { margin-bottom: 0; }
.doc blockquote table { background: var(--plane); }

.doc hr { border: none; border-top: 1px solid var(--line); margin: 32px 0; }

pre.code {
  background: var(--plane); border: 1px solid var(--line); border-radius: 6px;
  padding: 12px 16px; overflow-x: auto;
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace; font-size: 13.5px;
  color: var(--ink-2); line-height: 1.5;
}
pre.code code { color: inherit; }

/* Long generated tables get their own scroll rather than stretching the page. */
.doc .tablewrap { overflow-x: auto; margin: 12px 0; }
.doc .tablewrap table { margin: 0; min-width: 100%; }

/* ---------- stat cards ---------- */

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin: 24px 0 8px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.card .k { color: var(--ink); font-size: 26px; font-weight: 650; line-height: 1.1; }
.card .v { color: var(--accent); font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 6px; }
.card p { color: var(--muted); font-size: 13px; margin: 0; line-height: 1.45; }

/* ---------- charts ---------- */

.chart {
  display: block; width: 100%; height: auto;
  background: var(--surface);
  border: 1px solid var(--line); border-radius: var(--radius);
  margin: 16px 0 6px; padding: 8px;
}
.chart .bar rect, .chart circle { transition: opacity .12s ease; }
.chart:hover .bar rect { opacity: .55; }
.chart .bar:hover rect { opacity: 1; }
.cap { color: var(--muted); font-size: 13.5px; margin-top: 0; }

pre.eq {
  background: var(--surface); border: 1px solid var(--line); border-left: 3px solid var(--accent);
  border-radius: 6px; padding: 12px 16px; color: var(--ink);
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace; font-size: 14px;
  overflow-x: auto;
}

/* ---------- tables ---------- */

table {
  width: 100%; border-collapse: collapse; margin: 12px 0 8px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; font-size: 14.5px;
}
th, td { padding: 9px 14px; text-align: left; border-bottom: 1px solid var(--line); }
th { color: var(--ink); font-weight: 600; font-size: 13px; text-transform: uppercase; letter-spacing: 0.05em; background: var(--surface-2); }
td { font-variant-numeric: tabular-nums; }
tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: var(--surface-2); }
td.lock { color: var(--warn); font-weight: 600; }
table.scroll { display: block; max-height: 420px; overflow-y: auto; }

/* Wide content scrolls inside its own container; the page never scrolls sideways. */
.tablewrap { overflow-x: auto; }

/* ---------- callouts ---------- */

.callout {
  background: var(--surface); border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius); padding: 16px 18px; margin: 20px 0;
}
.callout.warn { border-left-color: var(--warn); }
.callout p:last-child, .callout ul:last-child { margin-bottom: 0; }

footer {
  border-top: 1px solid var(--line); padding: 24px;
  max-width: 860px; margin: 0 auto; color: var(--muted); font-size: 13.5px;
}
footer p { margin: 0 0 6px; }
.muted { color: var(--muted); }

/* ---------- feedback widget ---------- */

#cats-fb-btn {
  position: fixed; right: 18px; bottom: 18px; z-index: 60;
  background: var(--accent); color: #fff; border: none;
  border-radius: 999px; padding: 11px 18px;
  font: 600 14px/1 system-ui, sans-serif; cursor: pointer;
  box-shadow: 0 4px 16px rgba(0, 0, 0, .45);
}
#cats-fb-btn:hover { background: #256abf; }
#cats-fb-back {
  position: fixed; inset: 0; z-index: 70;
  background: rgba(0, 0, 0, .6); display: flex;
  align-items: center; justify-content: center; padding: 20px;
}
#cats-fb-modal {
  background: var(--surface); border: 1px solid var(--axis);
  border-radius: 12px; padding: 22px; width: min(520px, 100%);
  max-height: 90vh; overflow-y: auto;
}
#cats-fb-modal h2 { margin: 0 0 4px; border: none; padding: 0; font-size: 19px; }
#cats-fb-modal p.hint { color: var(--muted); font-size: 13.5px; margin: 0 0 14px; }
#cats-fb-modal label { display: block; color: var(--ink-2); font-size: 13px; margin: 12px 0 5px; font-weight: 600; }
#cats-fb-modal select, #cats-fb-modal input, #cats-fb-modal textarea {
  width: 100%; background: var(--plane); color: var(--ink);
  border: 1px solid var(--axis); border-radius: 6px; padding: 9px 11px;
  font: 14px/1.5 system-ui, sans-serif;
}
#cats-fb-modal textarea { min-height: 110px; resize: vertical; }
#cats-fb-modal .row { display: flex; gap: 10px; justify-content: flex-end; margin-top: 18px; }
#cats-fb-modal button {
  border-radius: 6px; padding: 9px 16px; font: 600 14px/1 system-ui, sans-serif; cursor: pointer;
  border: 1px solid var(--axis); background: var(--surface-2); color: var(--ink-2);
}
#cats-fb-modal button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
#cats-fb-modal button.primary:disabled { opacity: .6; cursor: default; }
#cats-fb-status { font-size: 13.5px; margin-top: 10px; }
#cats-fb-status.ok { color: var(--good); }
#cats-fb-status.err { color: var(--crit); }

@media (max-width: 560px) {
  main { padding: 24px 16px 64px; }
  .top { padding: 10px 16px; }
  th, td { padding: 8px 10px; }
}