/* ── Shared design tokens & components across all pages ── */
:root {
  --hue: 90;
  --paper: oklch(0.98 0.008 80);
  --paper-2: oklch(0.955 0.01 80);
  --paper-3: oklch(0.92 0.012 80);
  --ink: oklch(0.18 0.012 60);
  --ink-2: oklch(0.36 0.012 60);
  --ink-3: oklch(0.55 0.012 60);
  --line: oklch(0.87 0.012 var(--hue));
  --line-2: oklch(0.78 0.015 var(--hue));
  --accent: oklch(0.62 0.14 var(--hue));
  --accent-ink: oklch(0.32 0.11 var(--hue));
  --green: oklch(0.68 0.16 150);
  --red: oklch(0.65 0.2 25);
  --serif: "Instrument Serif", "Noto Serif SC", ui-serif, Georgia, serif;
  --sans: "Inter", -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Menlo, monospace;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font: inherit; color: inherit; cursor: pointer; }

.wrap { max-width: 1280px; margin: 0 auto; padding: 0 40px; }
@media (max-width: 720px) { .wrap { padding: 0 20px; } }

.mono { font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3); }
.hairline { height: 1px; background: var(--line); border: 0; }
.tag {
  display: inline-flex; align-items: center;
  font-family: var(--mono); font-size: 11px; color: var(--ink-2);
  padding: 5px 10px; border-radius: 999px; background: var(--paper-3);
  letter-spacing: 0.04em;
}

/* ── NAV ─ shared across pages ── */
.nav {
  position: sticky; top: 0; z-index: 30;
  background: color-mix(in oklab, var(--paper) 82%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.logo {
  display: flex; align-items: baseline; gap: 10px;
  font-family: var(--serif); font-size: 26px; letter-spacing: -0.01em;
}
.logo .dot { width: 7px; height: 7px; border-radius: 999px; background: var(--accent); display: inline-block; transform: translateY(-3px); }
.logo small { font-family: var(--mono); font-size: 10px; color: var(--ink-3); letter-spacing: 0.12em; text-transform: uppercase; }
.nav-links { display: flex; gap: 2px; align-items: center; }
.nav-links a {
  padding: 8px 14px; border-radius: 999px; font-size: 14px; color: var(--ink-2);
  transition: background 180ms, color 180ms;
}
.nav-links a:hover { background: var(--paper-2); color: var(--ink); }
.nav-links a.active { color: var(--ink); background: var(--paper-2); }
.nav-cta {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 16px 9px 18px; border-radius: 999px;
  background: var(--ink); color: var(--paper);
  font-size: 13px; font-weight: 500;
  transition: transform 200ms, background 200ms;
}
.nav-cta:hover { transform: translateY(-1px); background: var(--accent-ink); }
.nav-cta .arrow { width: 14px; height: 14px; transition: transform 200ms; }
.nav-cta:hover .arrow { transform: translate(2px, -2px); }
@media (max-width: 820px) { .nav-links { display: none; } }

/* ── Shared section header ── */
section.s { padding: 100px 0; }
.s-head { display: grid; grid-template-columns: 140px 1fr auto; gap: 40px; align-items: baseline; margin-bottom: 48px; }
.s-num { font-family: var(--mono); font-size: 12px; color: var(--ink-3); letter-spacing: 0.12em; }
.s-title { font-family: var(--serif); font-size: clamp(40px, 5vw, 68px); line-height: 1.02; letter-spacing: -0.015em; margin: 0; font-weight: 400; }
.s-title em { font-style: italic; color: var(--accent-ink); }
.s-kicker { font-size: 14px; color: var(--ink-3); max-width: 32ch; }
@media (max-width: 820px) {
  .s-head { grid-template-columns: 1fr; gap: 12px; }
  section.s { padding: 64px 0; }
}

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  height: 46px; padding: 0 22px; border-radius: 999px;
  border: 1px solid var(--line-2); background: transparent; color: var(--ink);
  font-size: 14px; font-weight: 500; cursor: pointer;
  transition: all 200ms;
}
.btn:hover { border-color: var(--ink); transform: translateY(-1px); }
.btn.primary { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn.primary:hover { background: var(--accent-ink); border-color: var(--accent-ink); }
.btn.accent { background: var(--accent); color: white; border-color: var(--accent); }
.btn .chev { width: 16px; height: 16px; }

/* ── Footer ── */
footer { padding: 72px 0 36px; border-top: 1px solid var(--line); margin-top: 40px; }
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 56px; }
@media (max-width: 820px) { .foot-grid { grid-template-columns: 1fr 1fr; } }
.foot-brand h4 { font-family: var(--serif); font-size: 40px; margin: 0 0 10px; letter-spacing: -0.01em; font-weight: 400; }
.foot-brand p { color: var(--ink-2); max-width: 34ch; margin: 0; }
.foot-col h5 { font-family: var(--mono); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-3); margin: 0 0 18px; }
.foot-col a { display: block; font-size: 15px; color: var(--ink-2); padding: 6px 0; transition: color 200ms, transform 200ms; }
.foot-col a:hover { color: var(--ink); transform: translateX(3px); }
.foot-bottom { display: flex; justify-content: space-between; align-items: center; padding-top: 28px; border-top: 1px solid var(--line); font-size: 13px; color: var(--ink-3); }
@media (max-width: 620px) { .foot-bottom { flex-direction: column; gap: 12px; align-items: flex-start; } }
.bigmark {
  font-family: var(--serif); font-size: clamp(120px, 22vw, 280px); line-height: 0.9;
  letter-spacing: -0.03em; color: var(--paper-3);
  user-select: none; margin: 40px 0 -40px; font-weight: 400;
}

/* ── Page intro hero (used on sub-pages) ── */
.page-hero { padding: 80px 0 40px; border-bottom: 1px solid var(--line); }
.page-hero .crumbs { display: flex; gap: 10px; align-items: center; font-family: var(--mono); font-size: 11px; color: var(--ink-3); letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 24px; }
.page-hero .crumbs a:hover { color: var(--ink); }
.page-hero h1 {
  font-family: var(--serif); font-weight: 400;
  font-size: clamp(56px, 8vw, 120px); line-height: 0.95; letter-spacing: -0.02em;
  margin: 0 0 24px;
}
.page-hero h1 em { font-style: italic; color: var(--accent-ink); }
.page-hero .lede { font-family: var(--serif); font-size: 24px; line-height: 1.3; color: var(--ink-2); max-width: 40ch; }
.page-hero .lede em { font-style: italic; color: var(--ink); }

/* chips */
.chips { display: flex; gap: 6px; flex-wrap: wrap; }