/* Trust Standard Protocol — static freeze stylesheet.
   CSP-clean: no inline styles anywhere; self-hosted system fonts only. */

:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --surface-2: #fbfcfe;
  --ink: #0a1422;
  --ink-soft: #36424f;
  --muted: #66717f;
  --line: #e2e7ee;
  --line-strong: #cbd3de;
  --navy: #0a1422;
  --gold: #9a6c12;
  --gold-bright: #f0b83e;
  --green: #157347;
  --green-bg: #e6f4ec;
  --red: #b02a37;
  --red-bg: #fbe9eb;
  --amber: #8a6d1a;
  --amber-bg: #fbf3dd;
  --radius: 12px;
  --maxw: 1080px;
  --mono: ui-monospace, "SFMono-Regular", "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--gold); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(246, 248, 251, 0.88);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex; align-items: center; gap: 28px;
  height: 62px; max-width: var(--maxw); margin: 0 auto; padding: 0 24px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--ink); letter-spacing: .2px; }
.brand img { width: 26px; height: 26px; display: block; }
.brand:hover { text-decoration: none; }
.nav-links { display: flex; gap: 22px; margin-left: auto; align-items: center; }
.nav-links a { color: var(--ink-soft); font-size: 15px; font-weight: 500; }
.nav-links a:hover { color: var(--ink); text-decoration: none; }
.nav-cta {
  background: var(--navy); color: #fff !important; padding: 8px 16px;
  border-radius: 999px; font-size: 14px; font-weight: 600;
}
.nav-cta:hover { background: #16243a; text-decoration: none; }

/* ---------- Generic blocks ---------- */
main { display: block; }
section { padding: 64px 0; border-top: 1px solid var(--line); }
section:first-of-type { border-top: none; }
.sec-num { font-family: var(--mono); font-size: 13px; color: var(--gold); letter-spacing: 1px; }
h1 { font-size: clamp(30px, 5vw, 46px); line-height: 1.1; letter-spacing: -0.5px; margin: 14px 0 18px; }
h2 { font-size: clamp(23px, 3.2vw, 31px); line-height: 1.15; letter-spacing: -0.3px; margin: 8px 0 16px; }
h3 { font-size: 18px; margin: 0 0 8px; }
p { color: var(--ink-soft); margin: 0 0 16px; max-width: 68ch; }
.lead { font-size: 19px; color: var(--ink-soft); }
.muted { color: var(--muted); }
small, .small { font-size: 13.5px; }

.badge {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 12.5px; letter-spacing: .3px;
  color: var(--gold); background: var(--surface);
  border: 1px solid var(--line-strong); border-radius: 999px;
  padding: 5px 13px; text-transform: none;
}
.badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--gold-bright); }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 600; font-size: 15px; padding: 11px 20px;
  border-radius: 999px; border: 1px solid transparent; cursor: pointer;
}
.btn-primary { background: var(--navy); color: #fff; }
.btn-primary:hover { background: #16243a; text-decoration: none; }
.btn-ghost { background: var(--surface); color: var(--ink); border-color: var(--line-strong); }
.btn-ghost:hover { border-color: var(--ink); text-decoration: none; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 8px; }

/* ---------- Hero ---------- */
.hero { padding: 72px 0 56px; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 48px; align-items: start; }
@media (max-width: 860px) { .hero-grid { grid-template-columns: 1fr; gap: 32px; } }

/* ---------- Cards ---------- */
.cards { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px;
}
.card h3 { display: flex; align-items: center; gap: 9px; }
.card p { font-size: 15px; margin: 0; }
.card .k { font-family: var(--mono); font-size: 12px; color: var(--gold); }

/* two-column proves / not-proves */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 760px) { .split { grid-template-columns: 1fr; } }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.panel.good { border-left: 3px solid var(--green); }
.panel.warn { border-left: 3px solid var(--red); }
.panel h3 { font-size: 15px; text-transform: uppercase; letter-spacing: .6px; color: var(--muted); }
.ticklist { list-style: none; margin: 0; padding: 0; }
.ticklist li { position: relative; padding: 7px 0 7px 26px; font-size: 15px; color: var(--ink-soft); border-top: 1px solid var(--line); }
.ticklist li:first-child { border-top: none; }
.ticklist li::before { position: absolute; left: 0; top: 7px; font-weight: 700; }
.panel.good .ticklist li::before { content: "\2713"; color: var(--green); }
.panel.warn .ticklist li::before { content: "\2715"; color: var(--red); }

/* ---------- Code / JSON ---------- */
pre, code, .mono { font-family: var(--mono); }
pre.code {
  background: #0b1422; color: #d8e2ef; border-radius: var(--radius);
  padding: 18px 20px; overflow-x: auto; font-size: 13.5px; line-height: 1.55;
  border: 1px solid #1c2a3e;
}
pre.code .key { color: #9ec5ff; }
pre.code .str { color: #f0b83e; }
pre.code .muted { color: #6b7c93; }
code.inline { background: #eef1f6; border: 1px solid var(--line); border-radius: 5px; padding: 1px 6px; font-size: 0.9em; color: var(--ink); }

/* field defs */
.deflist { display: grid; grid-template-columns: max-content 1fr; gap: 6px 18px; align-items: baseline; }
.deflist dt { font-family: var(--mono); font-size: 13.5px; color: var(--gold); }
.deflist dd { margin: 0; font-size: 15px; color: var(--ink-soft); }

/* timeline */
.timeline { border-left: 2px solid var(--line-strong); margin: 8px 0 0; padding: 0; list-style: none; }
.timeline li { position: relative; padding: 0 0 18px 22px; }
.timeline li::before { content: ""; position: absolute; left: -7px; top: 4px; width: 12px; height: 12px; border-radius: 50%; background: var(--gold-bright); border: 2px solid var(--bg); }
.timeline .date { font-family: var(--mono); font-size: 13px; color: var(--gold); display: block; }

/* stats */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px,1fr)); gap: 16px; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.stat .n { font-size: 34px; font-weight: 700; color: var(--navy); letter-spacing: -1px; }
.stat .lab { font-size: 14px; color: var(--ink-soft); margin-top: 4px; }
.stat a { font-size: 12.5px; }

/* ---------- Demo / verifier widget ---------- */
.demo { background: var(--surface); border: 1px solid var(--line-strong); border-radius: 16px; padding: 22px; }
.demo h3 { font-size: 14px; text-transform: uppercase; letter-spacing: .6px; color: var(--muted); margin-bottom: 14px; }
label.fld { display: block; font-size: 12px; font-weight: 600; letter-spacing: .4px; text-transform: uppercase; color: var(--muted); margin: 12px 0 5px; }
input.fld, textarea.fld {
  width: 100%; font-family: var(--mono); font-size: 13.5px; color: var(--ink);
  background: var(--surface-2); border: 1px solid var(--line-strong); border-radius: 9px;
  padding: 10px 12px; resize: vertical;
}
input.fld:focus, textarea.fld:focus { outline: 2px solid var(--gold-bright); outline-offset: 1px; border-color: var(--gold); }
textarea.fld { min-height: 96px; line-height: 1.5; }

.digestbox { font-family: var(--mono); font-size: 12.5px; word-break: break-all; background: var(--surface-2); border: 1px solid var(--line); border-radius: 8px; padding: 9px 11px; color: var(--ink-soft); }
.digestbox .lab { display: block; font-size: 11px; text-transform: uppercase; letter-spacing: .5px; color: var(--muted); margin-bottom: 3px; }
.match { color: var(--green); } .nomatch { color: var(--red); }

.pill { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; font-size: 14px; padding: 7px 15px; border-radius: 999px; font-family: var(--mono); }
.pill .dot { width: 9px; height: 9px; border-radius: 50%; }
.pill.valid { background: var(--green-bg); color: var(--green); } .pill.valid .dot { background: var(--green); }
.pill.invalid { background: var(--red-bg); color: var(--red); } .pill.invalid .dot { background: var(--red); }
.pill.malformed { background: var(--amber-bg); color: var(--amber); } .pill.malformed .dot { background: var(--amber); }
.pill.idle { background: #eef1f6; color: var(--muted); } .pill.idle .dot { background: var(--muted); }

.btn-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.btn-sm { font-size: 13px; padding: 7px 13px; border-radius: 8px; border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink); cursor: pointer; font-weight: 600; }
.btn-sm:hover { border-color: var(--ink); }
.btn-sm.danger { color: var(--red); border-color: #e3b4ba; }
.btn-sm.danger:hover { border-color: var(--red); }

.checks { list-style: none; margin: 12px 0 0; padding: 0; }
.checks li { display: flex; gap: 9px; align-items: baseline; font-size: 13.5px; padding: 6px 0; border-top: 1px solid var(--line); }
.checks li:first-child { border-top: none; }
.checks .st { font-family: var(--mono); font-size: 11px; font-weight: 700; padding: 1px 7px; border-radius: 5px; flex: none; }
.st.passed { background: var(--green-bg); color: var(--green); }
.st.failed { background: var(--red-bg); color: var(--red); }
.st.skipped { background: #eef1f6; color: var(--muted); }
.checks .ct { color: var(--ink-soft); }

.tabs { display: inline-flex; gap: 4px; background: #eef1f6; border-radius: 10px; padding: 4px; margin-bottom: 6px; }
.tab { border: none; background: transparent; font-weight: 600; font-size: 14px; color: var(--muted); padding: 7px 16px; border-radius: 7px; cursor: pointer; }
.tab[aria-selected="true"] { background: var(--surface); color: var(--ink); box-shadow: 0 1px 2px rgba(10,20,34,.08); }

.verifier-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; align-items: start; }
@media (max-width: 820px) { .verifier-grid { grid-template-columns: 1fr; } }

.note { background: var(--surface-2); border: 1px solid var(--line); border-left: 3px solid var(--gold-bright); border-radius: 10px; padding: 16px 18px; }
.note p { margin: 0 0 8px; font-size: 14.5px; } .note p:last-child { margin: 0; }
.parse-err { color: var(--red); font-family: var(--mono); font-size: 13px; white-space: pre-wrap; }
.hidden { display: none !important; }

/* steps */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px,1fr)); gap: 16px; counter-reset: step; }
.step { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.step .n { font-family: var(--mono); font-size: 12px; color: var(--gold); }

/* spec layout */
.doc { display: grid; grid-template-columns: 220px 1fr; gap: 40px; align-items: start; }
@media (max-width: 900px) { .doc { grid-template-columns: 1fr; } .toc { position: static !important; } }
.toc { position: sticky; top: 80px; font-size: 14px; }
.toc ol { list-style: none; margin: 0; padding: 0; counter-reset: toc; }
.toc li { margin: 0; }
.toc a { display: block; color: var(--muted); padding: 4px 0; border-left: 2px solid var(--line); padding-left: 12px; }
.toc a:hover { color: var(--ink); border-color: var(--gold); text-decoration: none; }
.doc-body section { border: none; padding: 0 0 38px; }
.doc-body h2 { scroll-margin-top: 80px; }
table.spec { width: 100%; border-collapse: collapse; font-size: 14.5px; margin: 6px 0 14px; }
table.spec th, table.spec td { text-align: left; padding: 9px 12px; border: 1px solid var(--line); vertical-align: top; }
table.spec th { background: var(--surface-2); font-size: 13px; }
table.spec td code { font-family: var(--mono); font-size: 13px; color: var(--gold); }

/* footer */
.site-footer { border-top: 1px solid var(--line); padding: 40px 0; background: var(--surface); }
.foot { display: flex; flex-wrap: wrap; gap: 18px 30px; align-items: center; }
.foot .brand { font-size: 15px; }
.foot-links { display: flex; gap: 20px; flex-wrap: wrap; }
.foot-links a { color: var(--ink-soft); font-size: 14px; }
.foot .copy { color: var(--muted); font-size: 13px; margin-left: auto; max-width: 46ch; text-align: right; }
@media (max-width: 640px) { .foot .copy { margin-left: 0; text-align: left; } }

/* ---------- spacing utilities (CSP-clean; no inline styles) ---------- */
.mt-2 { margin-top: 12px; }
.mt-3 { margin-top: 14px; }
.mt-16 { margin-top: 16px; }
.mt-4 { margin-top: 18px; }
.mt-5 { margin-top: 20px; }
.mt-6 { margin-top: 22px; }
.mb-0 { margin-bottom: 0; }
.narrow { max-width: 62ch; }
.stack-sm { display: grid; gap: 9px; margin-top: 12px; }
.row-mid { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-top: 14px; }