/* ============================================================
   AVORANT — shared design system
   Noto Serif JP (display) · Hanken Grotesk (body) · IBM Plex Mono (meta)
   ============================================================ */

:root {
  /* palette */
  --mahogany: #3C0000;
  --mahogany-80: #5a1414;
  --ink: #1A2838;
  --ink-soft: #2a3a4d;
  --cream: #F4ECDD;
  --paper: #FAF5EC;
  --honeydew: #E8F7EE;
  --ash: #B8C4BB;
  --sky: #C9D6EA;

  /* semantic */
  --ground: var(--cream);
  --text: var(--mahogany);
  --blue: #1A2838;            /* Deep Space Blue — secondary accent */
  --blue-soft: #2f4a66;       /* lifted blue for labels on cream */
  --muted: rgba(60, 0, 0, 0.58);
  --faint: rgba(60, 0, 0, 0.34);
  --hair: rgba(60, 0, 0, 0.16);
  --hair-soft: rgba(60, 0, 0, 0.10);

  /* type */
  --serif: "Noto Serif JP", serif;
  --sans: "Hanken Grotesk", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;

  /* metrics */
  --gutter: clamp(22px, 5vw, 88px);
  --maxw: 1240px;
  --nav-h: 76px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--ground);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--mahogany); color: var(--cream); }

a { color: inherit; text-decoration: none; }

img { max-width: 100%; display: block; }

/* ---------- layout ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section { padding-block: clamp(72px, 11vw, 160px); }
.section--tight { padding-block: clamp(48px, 7vw, 96px); }

.rule { height: 1px; background: var(--hair); border: 0; margin: 0; }

/* ---------- type ---------- */
.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--blue-soft);
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  opacity: 0.5;
}
.eyebrow--plain::before { display: none; }

.display {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(48px, 8.5vw, 132px);
  line-height: 0.98;
  letter-spacing: -0.005em;
  margin: 0;
  text-wrap: balance;
}
h1, .h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(40px, 6vw, 84px);
  line-height: 1.02;
  letter-spacing: -0.005em;
  margin: 0;
  text-wrap: balance;
}
h2, .h2 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(28px, 3.6vw, 48px);
  line-height: 1.08;
  letter-spacing: 0.002em;
  margin: 0;
  text-wrap: balance;
}
h3, .h3 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(21px, 2vw, 27px);
  line-height: 1.2;
  margin: 0;
}
.lead {
  font-size: clamp(19px, 1.9vw, 24px);
  line-height: 1.5;
  color: var(--muted);
  font-weight: 400;
  max-width: 56ch;
  text-wrap: pretty;
}
p { text-wrap: pretty; }
.prose p { margin: 0 0 1.25em; max-width: 64ch; color: rgba(60,0,0,0.82); }
.prose p:last-child { margin-bottom: 0; }

.measure { max-width: 60ch; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 14px 24px;
  border: 1px solid var(--mahogany);
  border-radius: 0;
  background: transparent;
  color: var(--mahogany);
  cursor: pointer;
  transition: background .35s ease, color .35s ease, transform .35s ease;
}
.btn:hover { background: var(--mahogany); color: var(--cream); }
.btn--solid { background: var(--mahogany); color: var(--cream); }
.btn--solid:hover { background: var(--mahogany-80); }
.btn .arr { transition: transform .35s ease; }
.btn:hover .arr { transform: translateX(4px); }

.link-arrow {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  border-bottom: 1px solid var(--hair);
  padding-bottom: 4px;
  transition: gap .3s ease, border-color .3s ease;
}
.link-arrow:hover { gap: 15px; border-color: var(--blue-soft); }

/* ---------- nav (injected) ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: color-mix(in srgb, var(--cream) 86%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--hair-soft);
}
.nav__inner {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
/* ---------- brand lockup (animated "A" → "Avorant") ---------- */
.brand { display: inline-flex; align-items: center; }
.nav__mark {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 25px;
  letter-spacing: 0.005em;
  color: var(--mahogany);
  line-height: 1;
  white-space: nowrap;
}
.brand__a, .brand__rest { display: inline-block; vertical-align: top; }
.brand__rest {
  overflow: hidden;
  max-width: 0;
  opacity: 0;
  transition: max-width .85s cubic-bezier(.2,.7,.2,1), opacity .6s ease;
}
.brand:hover .brand__rest,
.brand:focus-visible .brand__rest { max-width: 14ch; opacity: 1; }
/* one-time reveal on load: A expands to Avorant, then settles back to A */
.brand--intro .brand__rest {
  animation: brandIntro 6s cubic-bezier(.2,.7,.2,1) .6s 1;
}
@keyframes brandIntro {
  0%   { max-width: 0;    opacity: 0; }
  24%  { max-width: 14ch; opacity: 1; }
  80%  { max-width: 14ch; opacity: 1; }
  100% { max-width: 0;    opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .brand__rest { max-width: 14ch; opacity: 1; transition: none; animation: none; }
}
.nav__links {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2.4vw, 38px);
}
.nav__link {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--mahogany);
  opacity: 0.62;
  transition: opacity .25s ease;
  position: relative;
  padding-block: 6px;
}
.nav__link:hover { opacity: 1; }
.nav__link[aria-current="page"] { opacity: 1; }
.nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--mahogany);
}
.nav__toggle { display: none; }

@media (max-width: 860px) {
  .nav__links {
    position: fixed;
    inset: var(--nav-h) 0 auto 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--cream);
    border-bottom: 1px solid var(--hair);
    padding: 8px var(--gutter) 22px;
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity .25s ease, transform .25s ease;
  }
  .nav__links.open { opacity: 1; transform: none; pointer-events: auto; }
  .nav__link { padding-block: 14px; font-size: 13px; width: 100%; border-bottom: 1px solid var(--hair-soft); }
  .nav__toggle {
    display: inline-flex;
    flex-direction: column;
    gap: 5px;
    background: none; border: 0; cursor: pointer; padding: 8px;
  }
  .nav__toggle span { width: 24px; height: 1.5px; background: var(--mahogany); transition: .3s; }
  .nav__toggle.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
  .nav__toggle.open span:nth-child(2) { opacity: 0; }
  .nav__toggle.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }
}

/* ---------- footer (injected) ---------- */
.footer {
  background: var(--ink);
  color: var(--cream);
  padding-block: clamp(56px, 8vw, 104px) 40px;
}
.footer a { color: var(--cream); }
.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px 32px;
}
@media (max-width: 860px) { .footer__grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .footer__grid { grid-template-columns: 1fr; } }
.footer__mark {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(40px, 6vw, 72px);
  letter-spacing: 0.005em;
  line-height: 0.9;
  color: var(--cream);
}
.footer__tag {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ash);
  margin-top: 18px;
  max-width: 30ch;
  line-height: 1.7;
}
.footer__col h4 {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ash);
  margin: 0 0 18px;
}
.footer__col ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 11px; }
.footer__col a {
  font-size: 15px;
  color: rgba(243,236,221,0.78);
  transition: color .25s ease;
}
.footer__col a:hover { color: var(--cream); }
.footer__base {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: clamp(48px, 7vw, 88px);
  padding-top: 26px;
  border-top: 1px solid rgba(243,236,221,0.14);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(243,236,221,0.5);
}

/* ---------- inverted section (deep space) ---------- */
.invert {
  background: var(--ink);
  color: var(--cream);
}
.invert .eyebrow { color: var(--sky); }
.invert .lead { color: rgba(243,236,221,0.72); }
.invert .prose p { color: rgba(243,236,221,0.8); }
.invert .rule { background: rgba(243,236,221,0.16); }
.invert .btn { border-color: var(--cream); color: var(--cream); }
.invert .btn:hover { background: var(--cream); color: var(--ink); }
.invert .link-arrow { border-color: rgba(243,236,221,0.3); }
.invert .link-arrow:hover { border-color: var(--cream); }

/* ---------- reveal on scroll ----------
   FOUC-safe: only hidden once <html class="js"> is set (inline head script).
   If JS is disabled or fails, content stays visible. */
html.js .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .9s cubic-bezier(.2,.7,.2,1), transform .9s cubic-bezier(.2,.7,.2,1);
}
html.js .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html.js .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- misc utilities ---------- */
.grid { display: grid; gap: clamp(24px, 4vw, 56px); }
.cols-2 { grid-template-columns: repeat(2, 1fr); }
.cols-3 { grid-template-columns: repeat(3, 1fr); }
.cols-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .cols-3, .cols-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .cols-2, .cols-3, .cols-4 { grid-template-columns: 1fr; } }

.stack { display: flex; flex-direction: column; }
.tag {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}
.num {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--blue-soft);
}