/* Temporal Ledger — design tokens, reset, typography, layout primitives.
   Shared by every page on how-long-until-i.com. */
:root {
  --ink: #0B0D12;
  --surface: #12151D;
  --surface-2: #171B24;
  --hairline: rgba(255, 255, 255, 0.08);
  --hairline-strong: rgba(255, 255, 255, 0.16);
  --gold: #E8B44C;
  --gold-bg: color-mix(in srgb, var(--gold) 14%, transparent);
  --gold-ink: #1a1206;
  --text: #F2EFE8;
  --muted: #9AA0AC;
  --faint: #6c7280;
  --success: #6FCF97;
  --success-bg: color-mix(in srgb, var(--success) 14%, transparent);
  --warning: #E07A5F;
  --warning-bg: color-mix(in srgb, var(--warning) 14%, transparent);
  --grid-lived: #39424f;
  --grid-beyond: #181d26;

  --radius: 16px;
  --radius-sm: 10px;
  --maxw-calc: 720px;
  --maxw-hub: 960px;

  --font-display: "Fraunces", Georgia, "Times New Roman", serif;
  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
}

* { box-sizing: border-box; }
html { color-scheme: dark; }
body {
  margin: 0;
  background: var(--ink);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.mono, .num, code {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

h1, h2, h3 { font-family: var(--font-display); letter-spacing: -0.01em; margin: 0 0 0.5em; }
h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); line-height: 1.15; }
h2 { font-size: 1.4rem; line-height: 1.25; }
h3 { font-size: 1.1rem; line-height: 1.3; }
p { margin: 0 0 1em; color: var(--text); }
a { color: var(--gold); text-decoration: none; }
a:hover { text-decoration: underline; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: 8px; top: -48px; z-index: 100;
  background: var(--gold); color: var(--gold-ink); padding: 10px 16px;
  border-radius: var(--radius-sm); font-weight: 600; transition: top .15s;
}
.skip-link:focus { top: 8px; }

:focus-visible { outline: 2px solid var(--gold); outline-offset: 3px; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

/* ---------- header ---------- */
.site-header {
  max-width: var(--maxw-hub); margin: 0 auto; padding: 18px 20px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
}
.brand {
  font-family: var(--font-display); font-size: 1.2rem; font-weight: 600; color: var(--text);
  display: inline-flex; align-items: center; gap: 8px;
}
.brand:hover { text-decoration: none; }
.brand .hg { color: var(--gold); font-size: 1.3rem; }
.site-nav { display: flex; gap: 18px; flex-wrap: wrap; }
.site-nav a { color: var(--muted); font-size: 0.88rem; font-weight: 500; }
.site-nav a:hover, .site-nav a.active { color: var(--gold); text-decoration: none; }

/* ---------- footer ---------- */
.site-footer {
  max-width: var(--maxw-hub); margin: 40px auto 0; padding: 28px 20px 48px;
  border-top: 1px solid var(--hairline); font-size: 0.82rem; color: var(--faint);
}
.site-footer .footer-links { display: flex; gap: 14px; flex-wrap: wrap; margin: 0 0 14px; }
.site-footer .footer-links a { color: var(--muted); }
.site-footer p { color: var(--faint); font-size: 0.8rem; margin: 0 0 8px; }
.site-footer .privacy-line { color: var(--muted); }
.site-footer .safety-line { color: var(--muted); }
.site-footer .safety-line b { color: var(--text); }

/* ---------- breadcrumb ---------- */
.breadcrumb {
  max-width: var(--maxw-calc); margin: 0 auto; padding: 0 20px; font-size: 0.8rem; color: var(--faint);
  display: flex; gap: 6px; flex-wrap: wrap;
}
.breadcrumb a { color: var(--muted); }
.breadcrumb .sep { color: var(--faint); }

/* ---------- page containers ---------- */
main.calc-main { max-width: var(--maxw-calc); margin: 0 auto; padding: 8px 20px 48px; }
main.hub-main { max-width: var(--maxw-hub); margin: 0 auto; padding: 8px 20px 48px; }

.page-hero { padding: 14px 0 20px; }
.page-hero h1 { margin-bottom: 10px; }
.page-hero .dek { color: var(--muted); font-size: 1rem; max-width: 42rem; }

/* ---------- answer capsule ---------- */
.answer-capsule {
  background: var(--surface); border: 1px solid var(--hairline); border-left: 3px solid var(--gold);
  border-radius: var(--radius-sm); padding: 14px 18px; margin: 0 0 22px; font-size: 0.94rem; color: var(--text);
}
.answer-capsule strong { color: var(--gold); }

/* ---------- panel / card shell ---------- */
.panel {
  background: var(--surface); border: 1px solid var(--hairline); border-radius: var(--radius); padding: 22px;
}