/*
 * Sentinel Glasshouse — shared design system.
 *
 * Restrained. Monospace for hashes. Sans for prose. Two color tiers:
 *   - tier-3  (purple): cryptographic / R3 attestation accents
 *   - tier-2  (cyan):   informational R2 accents and links
 * Plus semantic green (ok), amber (warn), red (fail).
 *
 * No gradients (except one strict ring on the cryptographic seal).
 * No animations except the cursor blink in the verifier and the dot
 * pulse next to the live counter.
 */

:root {
  --bg:        #0b0f1a;
  --bg-2:      #0f1422;
  --panel:     #0f1422;
  --panel-2:   #131a2c;
  --line:      rgba(255,255,255,0.08);
  --line-2:    rgba(255,255,255,0.14);
  --text:      #e8ecf3;
  --text-mid:  #9aa3b2;
  --text-low:  #5a6273;
  --tier-3:    #a78bfa;
  --tier-2:    #7dd3fc;
  --ok:        #4ade80;
  --warn:      #fbbf24;
  --fail:      #f87171;
  --link:      #7dd3fc;

  --mono: ui-monospace, "SF Mono", "Menlo", "Consolas", "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px dotted rgba(125, 211, 252, 0.35);
}
a:hover { border-bottom-color: var(--link); }

code, pre, .mono { font-family: var(--mono); }
pre {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 14px 16px;
  font-size: 12.5px;
  overflow-x: auto;
  white-space: pre;
}

/* ── Layout ────────────────────────────────────────────────────────── */

.shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 28px;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  color: var(--text-mid);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}
.topbar .brand a {
  color: var(--text);
  border: 0;
  font-weight: 700;
}
.topbar nav { display: flex; gap: 24px; }
.topbar nav a {
  color: var(--text-mid);
  border: 0;
}
.topbar nav a:hover { color: var(--text); }
.topbar nav a.active { color: var(--text); }

.bottombar {
  margin-top: auto;
  padding: 18px 28px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--text-low);
}
.bottombar .key {
  word-break: break-all;
  max-width: 60%;
  text-align: right;
}

main { padding: 32px 28px; max-width: 1200px; margin: 0 auto; width: 100%; }

/* ── Headings ──────────────────────────────────────────────────────── */

h1, h2, h3 { color: var(--text); margin: 28px 0 12px; }
h1 { font-size: 28px; font-weight: 700; letter-spacing: -0.01em; }
h2 { font-size: 18px; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase; color: var(--text); border-bottom: 1px solid var(--line); padding-bottom: 8px; }
h3 { font-size: 14px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-mid); }

p { margin: 12px 0; max-width: 76ch; }
p.lead { font-size: 17px; color: var(--text); max-width: 76ch; }

dl.facts {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 8px 18px;
  margin: 20px 0;
  font-size: 13.5px;
}
dl.facts dt {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--text-low);
  text-transform: uppercase;
  padding-top: 2px;
}
dl.facts dd {
  margin: 0;
  font-family: var(--mono);
  color: var(--text);
  word-break: break-all;
}

/* ── Cards ─────────────────────────────────────────────────────────── */

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 18px 20px;
  margin: 14px 0;
}
.card.dense { padding: 14px 16px; }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 14px;
  margin: 20px 0;
}

.chooser-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 24px;
  text-decoration: none;
  color: inherit;
  border-bottom: 1px solid var(--line);
  transition: border-color 0.15s, background 0.15s;
  display: block;
}
.chooser-card:hover { border-color: var(--line-2); background: var(--panel-2); }
.chooser-card h3 {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text);
  letter-spacing: 0.08em;
}
.chooser-card .path {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--tier-2);
  margin-bottom: 12px;
}
.chooser-card p {
  margin: 0;
  font-size: 13.5px;
  color: var(--text-mid);
}

/* ── Mini AEP card (used in stream + reference) ───────────────────── */

.aep-mini {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 14px;
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  font-family: var(--mono);
  font-size: 12px;
  margin: 6px 0;
}
.aep-mini .boundary { color: var(--text); font-weight: 600; }
.aep-mini .tier {
  font-size: 10px;
  letter-spacing: 0.08em;
  padding: 2px 6px;
  border-radius: 3px;
  background: rgba(167,139,250,0.14);
  color: var(--tier-3);
}
.aep-mini .tier.r2 { background: rgba(125,211,252,0.14); color: var(--tier-2); }
.aep-mini .tier.r1 { background: rgba(154,163,178,0.14); color: var(--text-mid); }
.aep-mini .actor { color: var(--text-mid); font-size: 11px; }
.aep-mini .actor.human::before { content: "human · "; color: var(--warn); }
.aep-mini .actor.machine::before { content: "machine · "; }
.aep-mini .time { color: var(--text-low); font-size: 11px; text-align: right; }
.aep-mini .sig {
  grid-column: 1 / -1;
  margin-top: 4px;
  font-size: 10px;
  color: var(--text-low);
  word-break: break-all;
}

/* ── Seal (functional sigil) ──────────────────────────────────────── */

.seal { width: 160px; height: 160px; }
.seal-meta {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text-low);
  margin-top: 6px;
  text-align: center;
  letter-spacing: 0.08em;
}

/* ── Tables (catalogue, telemetry) ────────────────────────────────── */

table.dense {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 12.5px;
  margin: 12px 0;
}
table.dense th, table.dense td {
  text-align: left;
  padding: 8px 12px;
  border-bottom: 1px solid var(--line);
}
table.dense th {
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-low);
  font-weight: 600;
}
table.dense td.num { text-align: right; }
table.dense tr:hover td { background: var(--panel-2); }

/* ── Counters strip ───────────────────────────────────────────────── */

.counters {
  display: flex;
  gap: 36px;
  flex-wrap: wrap;
  padding: 18px 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  margin: 12px 0 28px;
}
.counter { font-family: var(--mono); }
.counter .k {
  display: block;
  font-size: 10px;
  letter-spacing: 0.15em;
  color: var(--text-low);
  text-transform: uppercase;
}
.counter .v {
  display: block;
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  margin-top: 4px;
}
.counter .v.tier-3 { color: var(--tier-3); }
.counter .v.tier-2 { color: var(--tier-2); }
.counter .v.ok { color: var(--ok); }
.counter .v.fail { color: var(--fail); }

.live-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ok);
  margin-right: 8px;
  vertical-align: middle;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(74,222,128,0.6); }
  70%  { box-shadow: 0 0 0 8px rgba(74,222,128,0); }
  100% { box-shadow: 0 0 0 0 rgba(74,222,128,0); }
}

/* ── Verify surface ───────────────────────────────────────────────── */

.verify-row {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 24px;
  margin: 16px 0 28px;
}
@media (max-width: 980px) { .verify-row { grid-template-columns: 1fr; } }

textarea.aep-input {
  width: 100%;
  min-height: 240px;
  background: var(--bg-2);
  color: var(--text);
  border: 1px solid var(--line-2);
  border-radius: 6px;
  padding: 12px;
  font-family: var(--mono);
  font-size: 12.5px;
  resize: vertical;
}
textarea.aep-input:focus {
  outline: none;
  border-color: var(--tier-2);
}

.btn {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  padding: 8px 14px;
  border-radius: 6px;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--line-2);
  cursor: pointer;
  text-transform: uppercase;
}
.btn:hover { background: var(--panel); border-color: var(--text-mid); }
.btn.primary { background: var(--tier-3); color: var(--bg); border-color: var(--tier-3); }
.btn.primary:hover { opacity: 0.92; }

.verdict {
  padding: 14px 16px;
  border-radius: 6px;
  font-family: var(--mono);
  font-size: 13px;
  border: 1px solid;
  margin: 14px 0;
}
.verdict.ok { border-color: var(--ok); color: var(--ok); background: rgba(74,222,128,0.06); }
.verdict.fail { border-color: var(--fail); color: var(--fail); background: rgba(248,113,113,0.06); }
.verdict.idle { border-color: var(--line); color: var(--text-mid); background: var(--panel); }

.step {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-mid);
  padding: 6px 0;
  border-bottom: 1px dashed var(--line);
}
.step:last-child { border-bottom: none; }
.step .label { color: var(--text-low); margin-right: 10px; min-width: 130px; display: inline-block; }
.step .val { color: var(--text); }
.step .val.ok { color: var(--ok); }
.step .val.fail { color: var(--fail); }
.step .val.short { word-break: break-all; }

/* ── Spec sections (reference page) ──────────────────────────────── */

article.spec h2 {
  margin-top: 48px;
  scroll-margin-top: 80px;
}
article.spec h3 { margin-top: 24px; scroll-margin-top: 80px; }
article.spec p { font-size: 14.5px; }
article.spec ul, article.spec ol { padding-left: 22px; }
article.spec li { margin: 6px 0; }

.toc {
  position: sticky;
  top: 60px;
  font-family: var(--mono);
  font-size: 11.5px;
  padding: 16px 0;
  border-left: 1px solid var(--line);
  padding-left: 18px;
}
.toc h3 { margin: 0 0 10px; font-size: 10px; color: var(--text-low); }
.toc ul { list-style: none; padding: 0; margin: 0; }
.toc li { margin: 6px 0; }
.toc a { color: var(--text-mid); border: 0; }
.toc a:hover { color: var(--text); }

.spec-layout {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 36px;
}
@media (max-width: 900px) { .spec-layout { grid-template-columns: 1fr; } .toc { display: none; } }

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }