/* Sencor AI — verification infrastructure
   Static stylesheet. No framework, no build step.
   Design intent: institutional authority (SWIFT, not Stripe).
   Restraint, hairlines, serif display, monospace data.
   Palette: Brand Guidelines v1.1 — dark (Near Black) default,
   Sencor Blue + Sencor/Warm Gold accents. */

:root {
  --ink:        #F7FAFC;   /* off-white body text on dark    */
  --ink-soft:   #AEB9CC;   /* secondary text                 */
  --ink-faint:  #8590A4;   /* captions, sources              */
  --paper:      #1A2028;   /* page background (Near Black)    */
  --panel:      #1F2A3D;   /* raised panels (deep-blue tint)  */
  --line:       #2E3A52;   /* hairline rules on dark          */
  --line-soft:  #262F44;
  --accent:     #ECC94B;   /* Warm Gold — links/accents (8.1:1 on Near Black) */
  --accent-deep:#D69E2E;   /* Sencor Gold                     */
  --blue:       #2B6CB0;   /* Sencor Blue — fills, logo       */
  --gold:       #D69E2E;   /* Sencor Gold — borders, bands    */
  --ok:         #48BB78;   /* status "running" dot            */

  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --serif: Georgia, "Times New Roman", "Iowan Old Style", serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --maxw: 1080px;
  --pad: clamp(20px, 5vw, 56px);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a { color: var(--accent); text-decoration: none; }
a:hover { color: #F6E05E; text-decoration: underline; text-underline-offset: 2px; }

/* skip-to-content link (visible on keyboard focus) — WCAG 2.4.1 */
.skip-link {
  position: absolute; left: 12px; top: -48px;
  z-index: 100;
  background: var(--blue); color: #F7FAFC;
  font-family: var(--mono); font-size: 13px; letter-spacing: 0.02em;
  padding: 9px 16px; border-radius: 6px;
  border: 1px solid var(--gold);
  transition: top 0.15s ease;
}
.skip-link:focus {
  top: 12px; color: #F7FAFC; text-decoration: none;
  outline: 2px solid var(--gold); outline-offset: 2px;
}

/* visible focus ring for keyboard users across interactive elements */
a:focus-visible, .skip-link:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px;
}

/* ---------- eyebrow / labels ---------- */
.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 18px;
}

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.topbar .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px; gap: 20px;
}
.brand {
  display: inline-flex; align-items: center; gap: 11px;
  font-family: var(--mono);
  font-weight: 600;
  letter-spacing: 0.34em;
  font-size: 15px;
  color: var(--ink);
  text-transform: uppercase;
}
.brand:hover { text-decoration: none; color: var(--ink); }
.brand-mark { display: block; width: 28px; height: 28px; flex: 0 0 auto; }
.nav { display: flex; align-items: center; gap: 26px; }
.nav a {
  color: var(--ink-soft);
  font-size: 14.5px;
  letter-spacing: 0.01em;
}
.nav a:hover { color: var(--ink); text-decoration: none; }

/* live status chip */
.status {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.04em;
  color: var(--ink-soft);
  border: 1px solid var(--line); border-radius: 999px;
  padding: 5px 12px; background: var(--panel); white-space: nowrap;
}
.status .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 0 0 rgba(72,187,120,0.6);
  animation: pulse 2.2s infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(72,187,120,0.55); }
  70%  { box-shadow: 0 0 0 7px rgba(72,187,120,0); }
  100% { box-shadow: 0 0 0 0 rgba(72,187,120,0); }
}
main:focus { outline: none; }
.status[data-state="unknown"] .dot { background: var(--ink-faint); animation: none; }

/* ---------- hero ---------- */
.hero { padding: clamp(56px, 11vw, 128px) 0 clamp(40px, 7vw, 80px); }
.hero h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(34px, 6vw, 60px);
  line-height: 1.06;
  letter-spacing: -0.012em;
  margin: 0 0 24px;
  max-width: 16ch;
}
.hero .lede {
  font-size: clamp(18px, 2.4vw, 22px);
  color: var(--ink-soft);
  max-width: 52ch;
  margin: 0 0 40px;
}
.hero-meta { display: flex; flex-wrap: wrap; gap: 40px 56px; align-items: flex-end; }

.stat .figure {
  font-family: var(--mono);
  font-size: clamp(40px, 7vw, 64px);
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--ink);
  line-height: 1;
}
.stat .caption { max-width: 30ch; color: var(--ink-soft); font-size: 15px; margin-top: 10px; }
.stat .source { font-family: var(--mono); font-size: 11.5px; color: var(--ink-faint); margin-top: 8px; letter-spacing: 0.02em; }

/* ---------- generic section ---------- */
section { padding: clamp(48px, 8vw, 92px) 0; border-top: 1px solid var(--line); }
section.flush-top { border-top: none; }
.section-head { margin-bottom: 44px; max-width: 60ch; }
.section-head h2 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(26px, 4vw, 38px);
  letter-spacing: -0.01em;
  margin: 0;
  line-height: 1.12;
}

/* prose blocks */
.prose p { max-width: 64ch; color: var(--ink); margin: 0 0 22px; }
.prose p:last-child { margin-bottom: 0; }
.prose .lead-term { font-weight: 600; }

/* numbered argument grid (What Sencor Is) */
.argblock {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.argblock .cell {
  background: var(--panel);
  padding: clamp(24px, 3vw, 36px);
}
.argblock .cell h3 {
  font-family: var(--mono);
  font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--accent); margin: 0 0 14px; font-weight: 600;
}
.argblock .cell p { margin: 0; color: var(--ink); font-size: 16px; line-height: 1.6; max-width: 46ch; }
.argblock .cell .num {
  font-family: var(--mono); font-size: 12px; color: var(--ink-faint); float: right;
}

/* ---------- papers ---------- */
.papers { border-top: 1px solid var(--line); }
.paper {
  display: grid;
  grid-template-columns: 56px 1fr auto;
  gap: 4px 22px;
  align-items: baseline;
  padding: 20px 4px;
  border-bottom: 1px solid var(--line-soft);
}
.paper .pn { font-family: var(--mono); color: var(--ink-faint); font-size: 14px; }
.paper .pt { font-family: var(--serif); font-size: 19px; font-weight: 600; line-height: 1.25; }
.paper .pd { grid-column: 2; color: var(--ink-soft); font-size: 15px; max-width: 64ch; }
.paper .doi {
  font-family: var(--mono); font-size: 12.5px; white-space: nowrap;
  align-self: start;
}
.paper.forthcoming .pt { color: var(--ink-soft); }
.paper.forthcoming .doi { color: var(--ink-faint); }
.note-inline { font-family: var(--mono); font-size: 12px; color: var(--ink-faint); margin-top: 16px; }

/* ---------- patents ---------- */
.coverage {
  display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px;
}
.coverage span {
  font-family: var(--mono); font-size: 13px;
  border: 1px solid var(--line); border-radius: 4px;
  padding: 7px 12px; color: var(--ink-soft); background: var(--panel);
}
.callout {
  font-family: var(--mono); font-size: 14px; color: var(--ink);
  border-left: 2px solid var(--accent); padding: 4px 0 4px 18px; margin: 0 0 24px;
}

/* ---------- about ---------- */
.company-line { font-size: clamp(18px, 2.2vw, 21px); max-width: 56ch; color: var(--ink); }
.founder { font-family: var(--mono); font-size: 14px; color: var(--ink-faint); margin-top: 22px; letter-spacing: 0.02em; }

/* ---------- legal page body ---------- */
.legal { padding: clamp(48px, 8vw, 88px) 0 64px; }
.legal h1 {
  font-family: var(--serif); font-weight: 600;
  font-size: clamp(28px, 5vw, 42px); margin: 0 0 8px; letter-spacing: -0.01em;
}
.legal .updated { font-family: var(--mono); font-size: 12px; color: var(--ink-faint); margin: 0 0 40px; letter-spacing: 0.03em; }
.legal h2 {
  font-family: var(--serif); font-size: 22px; font-weight: 600;
  margin: 40px 0 12px; padding-top: 8px;
}
.legal h3 { font-size: 16px; margin: 26px 0 8px; }
.legal p, .legal li { max-width: 70ch; color: var(--ink); }
.legal ul { padding-left: 20px; }
.legal li { margin: 6px 0; }
.legal .kv { font-family: var(--mono); font-size: 14px; line-height: 1.9; }
.legal .back { font-family: var(--mono); font-size: 13px; }
.legal address { font-style: normal; }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 48px 0 64px;
  margin-top: 24px;
}
.site-footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 24px 40px; }
.site-footer .copy { font-family: var(--mono); font-size: 13px; color: var(--ink-faint); letter-spacing: 0.02em; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 18px 24px; }
.site-footer nav a { color: var(--ink-soft); font-size: 14px; }
.site-footer nav a:hover { color: var(--ink); text-decoration: none; }
.ai-disclosure {
  font-family: var(--mono); font-size: 11.5px; color: var(--ink-faint);
  border-top: 1px solid var(--line-soft); margin-top: 28px; padding-top: 18px;
  max-width: 80ch;
}

/* ---------- responsive ---------- */
@media (max-width: 720px) {
  body { font-size: 16px; }
  .nav { gap: 16px; }
  .nav a.hide-sm { display: none; }
  .argblock { grid-template-columns: 1fr; }
  .paper { grid-template-columns: 40px 1fr; }
  .paper .doi { grid-column: 2; white-space: normal; }
  .hero-meta { gap: 28px; }
  .topbar .wrap { gap: 10px; }
  .status .label-full { display: none; }
}
@media (max-width: 480px) {
  .brand { letter-spacing: 0.22em; font-size: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  .status .dot { animation: none; }
  html { scroll-behavior: auto; }
}

/* ===================================================================
   Content-layer components (landing CTAs, content pages, research,
   patents). Extends the v1.1 system above — same palette, same idiom.
   =================================================================== */

/* nav: mark the current page */
.nav a[aria-current="page"] { color: var(--ink); }

/* ---------- call-to-action buttons ---------- */
.cta-row { display: flex; flex-wrap: wrap; gap: 14px 16px; margin: 4px 0 0; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 14px; letter-spacing: 0.02em;
  padding: 11px 20px; border-radius: 6px;
  border: 1px solid var(--line);
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}
.btn:hover { text-decoration: none; }
.btn-primary {
  background: var(--blue); color: #F7FAFC; border-color: var(--blue);
}
.btn-primary:hover { background: #2c74bd; color: #fff; border-color: var(--gold); }
.btn-ghost { background: transparent; color: var(--accent); }
.btn-ghost:hover { color: #F6E05E; border-color: var(--gold); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

/* ---------- generic content section lede ---------- */
.prose .lead { font-size: clamp(17px, 2vw, 20px); color: var(--ink-soft); max-width: 60ch; }
.prose h3 {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--accent);
  margin: 30px 0 12px; font-weight: 600;
}
.prose strong { font-weight: 600; color: var(--ink); }
.prose ul { padding-left: 20px; max-width: 64ch; color: var(--ink); margin: 0 0 22px; }
.prose li { margin: 8px 0; }

/* teaser cards on the landing page (research / patents) */
.teaser-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.teaser { background: var(--panel); padding: clamp(24px, 3vw, 36px); display: flex; flex-direction: column; }
.teaser h3 { font-family: var(--serif); font-size: 21px; font-weight: 600; margin: 0 0 12px; color: var(--ink); }
.teaser p { color: var(--ink-soft); font-size: 15.5px; margin: 0 0 20px; max-width: 46ch; }
.teaser .more { font-family: var(--mono); font-size: 13px; margin-top: auto; }

/* ---------- research page: papers with subtitle + summary ---------- */
.paper .ps {
  grid-column: 2; font-family: var(--serif); font-style: italic;
  color: var(--ink-soft); font-size: 15.5px; margin-top: 2px;
}
.paper .pd { margin-top: 6px; }
.movement-note { color: var(--ink-soft); max-width: 60ch; margin: 0 0 24px; }

/* transliteration disclosure — "Also in N languages" per paper */
.paper .langs { grid-column: 2; margin-top: 12px; }
.paper .langs > summary {
  font-family: var(--mono); font-size: 12.5px; color: var(--ink-faint);
  cursor: pointer; list-style: none; display: inline-flex;
  align-items: baseline; gap: 7px; transition: color .15s ease;
}
.paper .langs > summary::-webkit-details-marker { display: none; }
.paper .langs > summary::before {
  content: "\25B8"; /* ▸ */ font-size: 10px; color: var(--ink-faint);
  transition: color .15s ease;
}
.paper .langs[open] > summary::before { content: "\25BE"; /* ▾ */ }
.paper .langs > summary:hover,
.paper .langs > summary:hover::before,
.paper .langs[open] > summary { color: var(--accent); }
.paper .langs > summary:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px;
}
.paper .langs .lang-list {
  display: flex; flex-wrap: wrap; gap: 6px 16px;
  margin-top: 12px; max-width: 64ch;
}
.paper .langs .lang-list a {
  font-family: var(--mono); font-size: 12.5px; color: var(--ink-soft);
  white-space: nowrap;
}
.paper .langs .lang-list a:hover { color: var(--accent); text-decoration: none; }

/* ---------- patents page: function groups ---------- */
.pgroup { margin-top: 40px; }
.pgroup:first-of-type { margin-top: 0; }
.pgroup-head {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--accent);
  margin: 0 0 4px; font-weight: 600;
}
.patent-list { border-top: 1px solid var(--line); }
.patent {
  display: grid; grid-template-columns: 72px 1fr; gap: 4px 22px;
  padding: 18px 4px; border-bottom: 1px solid var(--line-soft); align-items: baseline;
}
.patent .pc { font-family: var(--mono); font-size: 13px; color: var(--accent); font-weight: 600; letter-spacing: 0.02em; }
.patent .pbody { color: var(--ink-soft); font-size: 15.5px; max-width: 70ch; }
.patent .pbody strong { color: var(--ink); font-weight: 600; }

/* wave intro band */
.wave-head { margin: 0 0 28px; }
.wave-head h2 { font-family: var(--serif); font-weight: 600; font-size: clamp(24px, 3.4vw, 32px); margin: 0 0 6px; letter-spacing: -0.01em; }
.wave-head .eyebrow { margin-bottom: 10px; }

@media (max-width: 720px) {
  .teaser-grid { grid-template-columns: 1fr; }
  .patent { grid-template-columns: 56px 1fr; }
}