/* ============================================================
   ARCTAN RESEARCH — site stylesheet
   Brand: navy #0F1B2D · teal #2E8B8B / #4ABCBC · gold #C9A84C
   Display: Palatino · Body: system sans
   ============================================================ */

:root {
  --navy: #0F1B2D;
  --navy-deep: #0A1322;
  --panel: #16263C;
  --line: #243752;
  --teal: #2E8B8B;
  --teal-bright: #4ABCBC;
  --gold: #C9A84C;
  --gold-soft: #D8BE72;
  --text: #E9EDF3;
  --muted: #93A0B4;
  --serif: "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: "Segoe UI", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--navy);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--teal-bright); text-decoration: none; }
a:hover { color: var(--gold-soft); }
a:focus-visible { outline: 2px solid var(--gold); outline-offset: 3px; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 28px; }

/* ---------- Header ---------- */

header.site {
  border-bottom: 1px solid var(--line);
  background: rgba(15, 27, 45, 0.92);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(8px);
}

.site-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--text);
}

.brand img { height: 44px; width: 44px; }

.brand .word {
  font-family: var(--serif);
  line-height: 1.1;
}

.brand .word .a {
  display: block;
  color: var(--gold);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.32em;
}

.brand .word .r {
  display: block;
  color: var(--teal-bright);
  font-size: 11px;
  letter-spacing: 0.46em;
}

nav.main { display: flex; align-items: center; gap: 26px; flex-wrap: wrap; }

nav.main a {
  color: var(--muted);
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

nav.main a:hover, nav.main a.active { color: var(--text); }

nav.main a.active { border-bottom: 2px solid var(--gold); padding-bottom: 3px; }

.lang {
  font-size: 13px;
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 5px 12px;
  color: var(--gold-soft) !important;
  letter-spacing: 0.1em;
}
.lang:hover { border-color: var(--gold); }

/* ---------- Hero ---------- */

.hero {
  position: relative;
  overflow: hidden;
  padding: 96px 0 110px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, var(--navy) 0%, var(--navy-deep) 100%);
}

.hero svg.curve {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.5;
  pointer-events: none;
}

.hero .inner { position: relative; max-width: 760px; }

.kicker {
  font-family: var(--serif);
  color: var(--gold);
  font-size: 13px;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  margin-bottom: 22px;
}

h1 {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1.18;
  margin-bottom: 24px;
}

.hero p.lede {
  color: var(--muted);
  font-size: 19px;
  max-width: 620px;
  margin-bottom: 36px;
}

.cta-row { display: flex; gap: 16px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  font-size: 14px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 13px 26px;
  border-radius: 3px;
  transition: background 0.2s, color 0.2s;
}

.btn.gold { background: var(--gold); color: var(--navy-deep); font-weight: 600; }
.btn.gold:hover { background: var(--gold-soft); color: var(--navy-deep); }

.btn.ghost { border: 1px solid var(--teal); color: var(--teal-bright); }
.btn.ghost:hover { border-color: var(--teal-bright); color: var(--text); }

/* ---------- Sections ---------- */

section.block { padding: 84px 0; border-bottom: 1px solid var(--line); }
section.block:last-of-type { border-bottom: none; }

.eyebrow {
  font-family: var(--serif);
  color: var(--teal-bright);
  font-size: 12px;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  margin-bottom: 14px;
}

h2 {
  font-family: var(--serif);
  font-size: clamp(26px, 3.4vw, 36px);
  font-weight: 700;
  margin-bottom: 18px;
}

h2 .rule {
  display: block;
  width: 64px;
  height: 2px;
  background: var(--gold);
  margin-top: 18px;
}

h3 {
  font-family: var(--serif);
  color: var(--gold-soft);
  font-size: 20px;
  margin-bottom: 10px;
}

p + p { margin-top: 16px; }

.measure { max-width: 720px; color: var(--text); }
.measure p { color: #C9D2DF; }

/* Three-column challenge/response grid */

.grid3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-top: 44px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 2px solid var(--gold);
  padding: 30px 26px;
}

.card .tag {
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--teal-bright);
  margin-bottom: 12px;
}

.card p { color: var(--muted); font-size: 15.5px; }

.card p strong { color: var(--text); }

/* Founder */

.founder {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 48px;
  align-items: start;
  margin-top: 24px;
}

.founder .who h3 { font-size: 26px; color: var(--text); margin-bottom: 4px; }
.founder .who .role { color: var(--gold-soft); font-family: var(--serif); font-size: 15px; letter-spacing: 0.06em; }
.founder .bio p { color: #C9D2DF; }

/* ---------- Document / list pages ---------- */

.page-head { padding: 72px 0 56px; border-bottom: 1px solid var(--line); }

.doc-list { list-style: none; margin-top: 36px; }

.doc-list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}

.doc-list .meta { flex: 1 1 420px; }

.doc-list .date {
  font-family: var(--serif);
  color: var(--gold);
  font-size: 13px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.doc-list h3 { color: var(--text); margin: 4px 0 6px; }

.doc-list p { color: var(--muted); font-size: 15.5px; }

.doc-list .get { white-space: nowrap; }

.empty-note {
  margin-top: 36px;
  border: 1px dashed var(--line);
  padding: 28px;
  color: var(--muted);
  font-size: 15.5px;
}

/* Whitepaper feature panel */

.paper {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 48px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  padding: 44px;
  margin-top: 44px;
}

.paper aside {
  border-left: 1px solid var(--line);
  padding-left: 36px;
  font-size: 15px;
  color: var(--muted);
}

.paper aside .label {
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--teal-bright);
  margin-bottom: 8px;
  margin-top: 18px;
}
.paper aside .label:first-child { margin-top: 0; }

/* Contact */

.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; margin-top: 40px; }

.contact-grid .cell { background: var(--panel); border: 1px solid var(--line); padding: 32px; }

.contact-grid .cell .label {
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--teal-bright);
  margin-bottom: 10px;
}

.contact-grid .cell a.big { font-family: var(--serif); font-size: 21px; }

/* ---------- Footer ---------- */

footer.site {
  border-top: 1px solid var(--line);
  background: var(--navy-deep);
  padding: 48px 0 40px;
  margin-top: 0;
}

.foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 13.5px;
}

.foot .legal { max-width: 640px; line-height: 1.6; }

.foot .mark { height: 36px; opacity: 0.85; }

/* ---------- Motion ---------- */

@media (prefers-reduced-motion: no-preference) {
  .hero svg.curve path.s {
    stroke-dasharray: 2400;
    stroke-dashoffset: 2400;
    animation: draw 2.4s ease-out 0.2s forwards;
  }
  @keyframes draw { to { stroke-dashoffset: 0; } }
}

/* ---------- Responsive ---------- */

@media (max-width: 860px) {
  .grid3 { grid-template-columns: 1fr; }
  .founder { grid-template-columns: 1fr; gap: 24px; }
  .paper { grid-template-columns: 1fr; padding: 30px; }
  .paper aside { border-left: none; padding-left: 0; border-top: 1px solid var(--line); padding-top: 24px; }
  .contact-grid { grid-template-columns: 1fr; }
  .site-bar { flex-direction: column; align-items: flex-start; gap: 14px; }
}

/* Large mark on hero right */
.hero .hero-mark {
  position: absolute;
  right: -40px;
  top: 50%;
  transform: translateY(-50%);
  height: 420px;
  opacity: 0.9;
  pointer-events: none;
}
@media (max-width: 1100px) { .hero .hero-mark { opacity: 0.18; right: -120px; } }