/* ============================================================
   PSIL Website — shared chassis (all pages load this file)
   Tokens, nav, footer, buttons, sections, ledgers, reveal motion
   ============================================================ */

:root {
  --navy-900: #07101c; --navy-800: #0d1b2e; --navy-700: #142336; --navy-600: #1a2f4a;
  --navy-500: #213a5c; --navy-300: #3d6491; --navy-200: #6b8fb5; --navy-100: #a8c0d6;
  --red-600: #a50e27; --red-500: #c41230; --red-400: #d9334f; --red-100: #fce8eb;
  --grey-900: #1a1916; --grey-800: #2e2c29; --grey-700: #4a4742; --grey-400: #9a948a;
  --grey-300: #b8b3ab; --grey-200: #d4d1cb; --grey-100: #e8e6e1; --grey-50: #f3f2ef;
  --off-white: #f8f7f4; --white: #ffffff;
  --serif: 'EB Garamond', Georgia, serif;
  --sans: 'IBM Plex Sans', 'Helvetica Neue', Arial, sans-serif;
  --mono: 'IBM Plex Mono', 'Courier New', monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { background: var(--white); color: var(--grey-900); font-family: var(--sans); font-size: 16px; line-height: 1.7; }

a { color: inherit; text-decoration: none; transition: color 150ms ease; }
p a, .body-link { color: var(--red-500); }
p a:hover, .body-link:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--red-500); outline-offset: 2px; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ── type ── */
.eyebrow {
  font-family: var(--sans); font-size: 13px; font-weight: 600;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--red-500);
}
.eyebrow.muted { color: var(--grey-400); }
h1, .h1 { font-family: var(--serif); font-weight: 400; font-size: clamp(36px, 4.4vw, 48px); line-height: 1.15; letter-spacing: -0.015em; color: var(--navy-800); }
h2, .h2 { font-family: var(--serif); font-weight: 400; font-size: clamp(26px, 3vw, 32px); line-height: 1.2; letter-spacing: -0.01em; color: var(--navy-800); }
.display { font-family: var(--serif); font-weight: 400; font-size: clamp(40px, 5.4vw, 64px); line-height: 1.1; letter-spacing: -0.02em; }
.lead { font-size: 18px; line-height: 1.65; color: var(--grey-700); max-width: 640px; }
.mono { font-family: var(--mono); }
.meta { font-family: var(--mono); font-size: 13px; color: var(--grey-400); }

/* ── sections ── */
.section { padding: 96px 0; background: var(--white); }
.section.alt { background: var(--off-white); }
.section.dark { background: var(--navy-800); }
.section-head { margin-bottom: 48px; }
.section-head .eyebrow { margin-bottom: 12px; }
.section-head .lead { margin-top: 16px; }
.section.dark h2 { color: var(--white); }
.section.dark .lead { color: var(--navy-100); }

/* ── buttons ── */
.btn {
  display: inline-block; font-family: var(--sans); font-size: 13px; font-weight: 600;
  letter-spacing: 0.08em; text-transform: uppercase; padding: 12px 28px;
  border-radius: 2px; border: 1px solid transparent; cursor: pointer;
  transition: background 150ms ease, color 150ms ease, border-color 150ms ease;
}
.btn-primary { background: var(--red-500); color: var(--white); }
.btn-primary:hover { background: var(--red-600); }
.btn-outline-light { border-color: var(--white); color: var(--white); background: transparent; }
.btn-outline-light:hover { background: var(--white); color: var(--navy-800); }
.btn-ghost { border-color: var(--navy-800); color: var(--navy-800); background: transparent; }
.btn-ghost:hover { background: var(--navy-800); color: var(--white); }
.btn-row { display: flex; gap: 16px; flex-wrap: wrap; }

/* ── nav ── */
.nav { position: sticky; top: 0; z-index: 100; background: var(--navy-800); border-bottom: 1px solid var(--navy-600); }
.nav-inner { max-width: 1200px; margin: 0 auto; padding: 0 24px; height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.lockup { display: flex; align-items: center; gap: 12px; }
.lockup .wm { font-family: var(--serif); font-weight: 400; font-size: 30px; letter-spacing: -0.02em; color: var(--white); line-height: 1; }
.lockup .rule { width: 1.5px; height: 30px; background: var(--red-500); opacity: 0.7; }
.lockup .sub { font-family: var(--sans); font-weight: 500; font-size: 9.5px; letter-spacing: 1.2px; text-transform: uppercase; color: var(--navy-100); line-height: 1.5; }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a { font-family: var(--sans); font-weight: 500; font-size: 13px; letter-spacing: 0.05em; color: var(--white); }
.nav-links a:hover, .nav-links a.active { color: var(--red-400); }
.nav-links .btn { padding: 10px 22px; }
.nav-toggle { display: none; background: none; border: 1px solid var(--navy-500); color: var(--white); font-family: var(--mono); font-size: 12px; letter-spacing: 0.1em; padding: 8px 14px; border-radius: 2px; cursor: pointer; }

/* ── hero / page header ── */
.hero { background: var(--navy-800); padding: 110px 0 100px; }
.hero .kicker { font-family: var(--mono); font-size: 13px; letter-spacing: 0.16em; color: var(--navy-100); margin-bottom: 22px; }
.hero .display { color: var(--white); max-width: 820px; margin-bottom: 24px; }
.hero .lead { color: var(--navy-100); margin-bottom: 40px; }
.page-header { background: var(--navy-800); padding: 88px 0 80px; }
.page-header .eyebrow { color: var(--red-400); margin-bottom: 14px; }
.page-header h1 { color: var(--white); margin-bottom: 14px; }
.page-header .lead { color: var(--navy-100); }

/* ── numbered ledger ── */
.ledger { display: grid; grid-template-columns: 1fr 1fr; column-gap: 64px; }
.ledger.single { grid-template-columns: 1fr; }
.ledger-row { display: grid; grid-template-columns: 52px 1fr; gap: 16px; align-items: baseline; border-top: 1px solid var(--grey-200); padding: 16px 0; }
.ledger-row .n { font-family: var(--mono); font-size: 14px; color: var(--red-500); }
.ledger-row .t { font-size: 15px; color: var(--grey-800); }

/* ── pillars ── */
.pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 48px; }
.pillar { border-top: 1px solid var(--grey-200); padding-top: 20px; }
.pillar .n { font-family: var(--mono); font-size: 15px; color: var(--red-500); margin-bottom: 14px; }
.pillar h3 { font-family: var(--serif); font-weight: 400; font-size: 22px; color: var(--navy-800); margin-bottom: 10px; }
.pillar p { font-size: 14px; line-height: 1.65; color: var(--grey-700); }

/* ── feature row (Featured Research) ── */
.feature-row { display: grid; grid-template-columns: 1fr 420px; gap: 72px; align-items: start; }
.vol-ledger { border: 1px solid var(--grey-200); border-radius: 4px; background: var(--white); box-shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.04); }
.vol-ledger .vl-head { border-bottom: 1px solid var(--grey-200); padding: 12px 20px; font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; color: var(--grey-400); }
.vol-row { padding: 16px 20px; border-bottom: 1px solid var(--grey-100); }
.vol-row:last-child { border-bottom: none; }
.vol-row .vr-meta { font-family: var(--mono); font-size: 10.5px; color: var(--grey-400); margin-bottom: 5px; }
.vol-row .vr-meta .live { color: var(--red-500); }
.vol-row .vr-title { font-family: var(--serif); font-size: 18px; color: var(--navy-800); }

/* ── cross-link band ── */
.xlink { border-top: 1px solid var(--grey-200); border-bottom: 1px solid var(--grey-200); background: var(--white); }
.xlink a { display: flex; justify-content: space-between; align-items: baseline; gap: 24px; padding: 28px 0; }
.xlink .xl-title { font-family: var(--serif); font-size: 22px; color: var(--navy-800); transition: color 150ms ease; }
.xlink a:hover .xl-title { color: var(--red-500); }
.xlink .xl-meta { font-family: var(--mono); font-size: 12px; letter-spacing: 0.08em; color: var(--grey-400); white-space: nowrap; }

/* ── subscribe band ── */
.subscribe { background: var(--navy-800); padding: 96px 0; text-align: center; }
.subscribe .eyebrow { color: var(--red-400); margin-bottom: 14px; }
.subscribe h2 { color: var(--white); margin-bottom: 14px; }
.subscribe p { color: var(--navy-100); max-width: 560px; margin: 0 auto 32px; }

/* ── founding partner band ── */
.partner-band { padding: 88px 0; background: var(--off-white); border-bottom: 1px solid var(--grey-200); }
.partner-rule { width: 64px; height: 2px; background: var(--red-500); margin-bottom: 28px; }
.partner-kicker { font-family: var(--mono); font-size: 12px; letter-spacing: 0.16em; color: var(--grey-400); margin-bottom: 18px; }
.partner-band h2 { font-size: clamp(30px, 3.6vw, 42px); max-width: 760px; margin-bottom: 18px; }
.partner-band h2 em { font-style: italic; color: var(--red-500); }
.partner-band p { color: var(--grey-700); max-width: 620px; margin-bottom: 36px; }
.cta-line { display: inline-flex; align-items: center; gap: 18px; font-family: var(--sans); font-size: 13px; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; color: var(--navy-800); }
.cta-line .stroke { position: relative; width: 64px; height: 2px; background: var(--red-500); transition: width 250ms ease; }
.cta-line .stroke::after { content: ''; position: absolute; right: -1px; top: -4px; width: 10px; height: 10px; border-top: 2px solid var(--red-500); border-right: 2px solid var(--red-500); transform: rotate(45deg) scale(0.7); }
.cta-line:hover { color: var(--red-500); }
.cta-line:hover .stroke { width: 104px; }

/* ── interactivity layer ── */
.ledger-row { transition: background 150ms ease; }
.ledger-row:hover { background: var(--grey-50); }
.section.alt .ledger-row:hover { background: var(--white); }
.pillar { transition: border-color 250ms ease; }
.pillar:hover { border-top-color: var(--red-500); }
.vol-row { transition: background 150ms ease; }
.vol-row:hover { background: var(--off-white); }
.gov-row { transition: background 150ms ease; }
.gov-row:hover { background: var(--grey-50); }
.partner-band .partner-rule { transition: width 350ms ease; }
.partner-band:hover .partner-rule { width: 104px; }

/* ── journey band (research page) ── */
.journey-band { border-top: 1px solid var(--grey-200); border-bottom: 1px solid var(--grey-200); background: var(--white); }
.jb { display: grid; grid-template-columns: 1fr 380px; gap: 64px; align-items: center; padding: 64px 0; }
.jb-title { font-family: var(--serif); font-weight: 400; font-size: 28px; letter-spacing: -0.01em; color: var(--navy-800); margin: 10px 0 6px; transition: color 150ms ease; }
.jb:hover .jb-title { color: var(--red-500); }
.jb-sub { font-size: 14px; color: var(--grey-700); }
.jb-track { position: relative; display: block; height: 2px; background: var(--grey-200); }
.jb-track .jb-fill { position: absolute; left: 0; top: 0; height: 2px; width: 0; background: var(--red-500); }
.jb-track .jb-dot { position: absolute; top: -4px; left: 0; width: 10px; height: 10px; border-radius: 50%; background: var(--red-500); box-shadow: 0 0 0 4px rgba(196,18,48,0.12); }
.jb-labels { display: flex; justify-content: space-between; font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.12em; color: var(--grey-400); margin-top: 12px; }
@media (max-width: 900px) { .jb { grid-template-columns: 1fr; gap: 32px; } }

/* ── footer ── */
.footer { background: var(--navy-800); border-top: 1px solid var(--navy-600); padding: 80px 0 36px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 48px; margin-bottom: 56px; }
.footer .tagline { font-family: var(--serif); font-size: 17px; font-style: italic; color: var(--navy-100); margin-top: 16px; max-width: 320px; }
.footer h4 { font-family: var(--sans); font-size: 11px; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: var(--navy-200); margin-bottom: 16px; }
.footer-col { display: flex; flex-direction: column; gap: 10px; }
.footer-col a { font-size: 13px; color: var(--navy-100); }
.footer-col a:hover { color: var(--white); }
.footer .legal { border-top: 1px solid var(--navy-600); padding-top: 24px; font-family: var(--mono); font-size: 12px; color: var(--navy-200); }

/* ── reveal motion (js adds .in; no-JS users see everything) ── */
@media (prefers-reduced-motion: no-preference) {
  html.js .rv { opacity: 0; transform: translateY(12px); transition: opacity 400ms ease-out, transform 400ms ease-out; }
  html.js .rv.in { opacity: 1; transform: translateY(0); }
}

/* ── responsive ── */
@media (max-width: 900px) {
  .section { padding: 64px 0; }
  .hero { padding: 80px 0 72px; }
  .pillars { grid-template-columns: 1fr; gap: 32px; }
  .ledger { grid-template-columns: 1fr; }
  .feature-row { grid-template-columns: 1fr; gap: 40px; }
  .footer-grid { grid-template-columns: 1fr; gap: 36px; }
  .nav-links { display: none; position: absolute; top: 72px; left: 0; right: 0; background: var(--navy-800); border-bottom: 1px solid var(--navy-600); flex-direction: column; align-items: flex-start; padding: 24px; gap: 20px; }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
}
@media (max-width: 600px) {
  .section { padding: 48px 0; }
  body { font-size: 15px; }
}