/* The 408 site: a dark "film" for the story (after flycrooked.com) and a light spec sheet for reading (after itsua.com).
   Space Grotesk reads, Barlow Condensed shouts, JetBrains Mono labels, Fraunces only in the wordmark. Fonts self-hosted (OFL). */
@font-face { font-family: "Space Grotesk"; font-weight: 300 700; font-display: swap; src: url("/fonts/space-grotesk-latin.woff2") format("woff2"); }
@font-face { font-family: "JetBrains Mono"; font-weight: 100 800; font-display: swap; src: url("/fonts/jetbrains-mono-latin.woff2") format("woff2"); }
@font-face { font-family: "Barlow Condensed"; font-weight: 700; font-display: swap; src: url("/fonts/barlow-condensed-bold-latin.woff2") format("woff2"); }
@font-face { font-family: "The 408 Wordmark"; font-weight: 100 900; font-display: block; src: url("/fonts/fraunces-wordmark.woff2") format("woff2"); }

:root {
  --sans: "Space Grotesk", -apple-system, "Segoe UI", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --display: "Barlow Condensed", "Arial Narrow", "Helvetica Neue", sans-serif;
  --wordmark: "The 408 Wordmark", "Iowan Old Style", Georgia, serif;
  --gutter: clamp(1.125rem, 4vw, 2.5rem);
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);

  /* the spec sheet: paper by day */
  --bg: #ffffff; --bg-2: #f6f6f3; --s1: #ffffff; --s2: #f1f1ed;
  --ink: #0e1012; --ink-2: #3a3e45; --ink-3: #5f636a;
  --line: #e2e2dc; --line-2: #c9c9c1;
  --brand: #5b45a8;           /* lavender, deepened for paper: links, Fred */
  --brand-soft: rgba(91, 69, 168, 0.10);
  --light: #9a6410; --light-soft: rgba(154, 100, 16, 0.12);   /* amber: a light is on */
  --ok: #047857; --warn: #b45309; --alert: #b42318;

  /* the film: always night */
  --night: #050507; --night-2: #0d0d12; --night-line: #26262e;
  --cream: #eceadf; --cream-hi: #fffdf7; --cream-2: #b9b6aa;
  --neon: #d6bbff; --neon-glow: rgba(214, 187, 255, 0.45);
  --amber: #ffd080;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0b0f; --bg-2: #111117; --s1: #111117; --s2: #1a1a22;
    --ink: #eceadf; --ink-2: #c9c6ba; --ink-3: #9d9a8f;
    --line: #24242c; --line-2: #34343e;
    --brand: #d6bbff; --brand-soft: rgba(214, 187, 255, 0.14);
    --light: #ffd080; --light-soft: rgba(255, 208, 128, 0.14);
    --ok: #6ee7a8; --warn: #ffb347; --alert: #ff8a7a;
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0; min-height: 100vh; min-height: 100dvh; display: flex; flex-direction: column;
  background: var(--bg); color: var(--ink);
  font: 400 1.0625rem/1.6 var(--sans);
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}
main { flex: 1; }
p { margin: 0; }
a { color: var(--brand); text-underline-offset: 0.2em; text-decoration-thickness: 1px; }
.wrap { width: 100%; max-width: 76rem; margin: 0 auto; padding-inline: max(var(--gutter), env(safe-area-inset-left, 0px)) max(var(--gutter), env(safe-area-inset-right, 0px)); }

/* labels: mono, tracked, never below 13 px */
.label, .eyebrow { font: 500 0.8125rem/1.3 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3); }

/* header: wordmark left, bracketed index right, hairline below */
.site-head { position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.site-head .wrap { display: flex; align-items: stretch; justify-content: space-between; gap: 1rem; min-height: 56px; }
.brand { display: flex; align-items: center; gap: 0.75rem; text-decoration: none; color: var(--ink); min-width: 0; }
.wordmark { font: 620 1.375rem/1 var(--wordmark); letter-spacing: -0.01em; font-variant-numeric: lining-nums; color: var(--ink); text-decoration: none; white-space: nowrap; }
.brand .tag { font: 500 0.8125rem/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3); white-space: nowrap; }
.brand .tag::before { content: "— "; }
.site-head nav { display: flex; }
.index { display: flex; align-items: stretch; margin: 0; padding: 0; list-style: none; }
.index li { display: flex; }
.index a { display: flex; align-items: center; min-height: 44px; height: 100%; padding: 0 1rem; border-left: 1px solid var(--line);
  font: 500 0.8125rem/1 var(--mono); letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-3); text-decoration: none; white-space: nowrap; }
.index a:hover, .index a[aria-current="page"] { color: var(--ink); }
.index a[aria-current="page"] { font-weight: 700; }
.index .n { color: var(--ink-3); font-weight: 400; margin-right: 0.45em; }
@media (max-width: 56rem) { .brand .tag { display: none; } }
@media (max-width: 34rem) { .index a { padding: 0 0.7rem; } .index .n { display: none; } .wordmark { font-size: 1.25rem; } }
@media (max-width: 23rem) { .site-head .wrap { gap: 0.5rem; } .index a { padding: 0 0.45rem; letter-spacing: 0; } .wordmark { font-size: 1.125rem; } }  /* 320 px: otherwise the nav covers the wordmark */

/* the film: night, condensed two-tone headlines, mono eyebrows, receipts */
.film { background: var(--night); color: var(--cream); position: relative; overflow: hidden; isolation: isolate; color-scheme: dark; }
.film a { color: var(--cream-hi); }
.film .eyebrow { color: var(--cream-2); letter-spacing: 0.14em; }
.shout { margin: 0; font: 700 clamp(3rem, 11.5vw, 7.75rem)/0.88 var(--display); text-transform: uppercase; letter-spacing: 0.005em; color: var(--cream-hi); text-wrap: balance; }
.shout .hi { display: block; color: var(--neon); text-shadow: 0 0 0.35em var(--neon-glow); }
.film .sub { font-size: 1.125rem; line-height: 1.55; color: var(--cream-2); max-width: 34rem; }
.film .sub b { color: var(--cream-hi); font-weight: 500; }
.btn { display: inline-flex; align-items: center; gap: 0.6rem; min-height: 44px; padding: 0 1.15rem; border: 1px solid rgba(236, 234, 223, 0.38);
  font: 500 0.8125rem/1 var(--mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--cream-hi); text-decoration: none; transition: border-color 160ms var(--ease), background 160ms var(--ease); }
.btn:hover { border-color: var(--neon); background: rgba(214, 187, 255, 0.08); }
.btn.solid { background: var(--neon); border-color: var(--neon); color: #120c22; }
.btn.solid:hover { background: var(--cream-hi); border-color: var(--cream-hi); }
.hero { min-height: min(calc(100svh - 57px), 54rem); display: grid; align-content: end; padding-block: 5rem 3rem; }
.hero .inner { position: relative; z-index: 2; display: grid; gap: 1.4rem; }
.hero .actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 0.4rem; }
.scroll-cue { position: absolute; left: 50%; bottom: 1.2rem; transform: translateX(-50%); z-index: 2; font: 500 0.8125rem/1 var(--mono); letter-spacing: 0.2em; text-transform: uppercase; color: var(--cream-2); }
.glow { position: absolute; z-index: 0; border-radius: 50%; pointer-events: none; background: radial-gradient(circle, var(--neon-glow) 0%, transparent 62%); opacity: 0.55; }
.hero-fred { position: absolute; z-index: 1; right: max(var(--gutter), 4vw); top: 12%; width: clamp(9rem, 26vw, 19rem); filter: drop-shadow(0 0 2.2rem rgba(214, 187, 255, 0.35)); }
.hero-fred + .glow, .glow.fred { right: -6vw; top: 0; width: 55vw; height: 55vw; max-width: 44rem; max-height: 44rem; }
@media (max-width: 40rem) { .hero-fred { position: relative; right: auto; top: auto; width: 8.5rem; margin-bottom: 0.5rem; } .hero { align-content: center; } }

.beat { border-top: 1px solid var(--night-line); padding-block: clamp(4rem, 12vh, 8rem); }
.beat .inner { display: grid; gap: 2rem; align-items: center; }
@media (min-width: 60rem) { .beat .inner { grid-template-columns: 1.35fr 1fr; gap: 4rem; } .beat .shout { font-size: clamp(3rem, 6.6vw, 6.25rem); } }
.beat .copy { display: grid; gap: 1.2rem; }
.receipt { margin: 0; border: 1px solid var(--night-line); background: var(--night-2); padding: 1.1rem 1.25rem 1.2rem; display: grid; gap: 0.2rem; font: 400 0.9375rem/1.55 var(--mono); color: var(--cream); }
.receipt .rh { display: flex; justify-content: space-between; gap: 1rem; font-size: 0.8125rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--cream-2); padding-bottom: 0.6rem; margin-bottom: 0.45rem; border-bottom: 1px solid var(--night-line); }
.receipt .r { display: grid; grid-template-columns: 9.5rem 1fr; gap: 1rem; }
.receipt .k { color: var(--cream-2); }
.receipt dt, .receipt dd { margin: 0; }
@media (max-width: 30rem) { .receipt .r { grid-template-columns: 7.5rem 1fr; gap: 0.75rem; } }
.receipt .bad { color: #ff8a7a; } .receipt .ok { color: #6ee7a8; } .receipt .hi { color: var(--neon); }
.finale { text-align: left; }

/* the spec sheet */
.spec { border-top: 1px solid var(--line); padding-block: clamp(3.5rem, 9vw, 6rem); }
.spec + .spec { background: var(--bg-2); }
.spec-head { display: grid; gap: 0.9rem; margin-bottom: 2.25rem; }
@media (min-width: 48rem) { .spec-head { grid-template-columns: 1fr auto; align-items: end; } .spec-head .label { grid-column: 1 / -1; } }
.slash { margin: 0; font: 500 clamp(2.5rem, 7vw, 4.75rem)/0.95 var(--sans); letter-spacing: -0.045em; color: var(--ink); }
.more { font: 500 0.8125rem/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-2); }

.rows { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--ink); }
.rows li { border-bottom: 1px solid var(--line); }
.rows a { display: grid; grid-template-columns: 3rem 1fr auto; gap: 0.25rem 1rem; align-items: baseline; padding: 1.15rem 0.25rem; color: var(--ink); text-decoration: none; transition: background 160ms var(--ease); }
.rows a:hover { background: var(--brand-soft); }
.rows .n { font: 500 0.8125rem/1.6 var(--mono); color: var(--ink-3); }
.rows .t { font: 500 clamp(1.125rem, 2.2vw, 1.375rem)/1.3 var(--sans); letter-spacing: -0.015em; }
.rows .d { grid-column: 2; font-size: 0.9375rem; color: var(--ink-2); }
.rows .rule { grid-column: 2; font: 500 0.8125rem/1.4 var(--mono); letter-spacing: 0.06em; text-transform: uppercase; color: var(--brand); }
.rows .go { grid-column: 3; grid-row: 1; font: 500 1rem/1 var(--mono); color: var(--ink-3); }
.rows a:hover .go { color: var(--brand); }

.grid4 { display: grid; grid-template-columns: repeat(auto-fit, minmax(10.5rem, 1fr)); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.grid4 > div { border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 1.25rem 1.25rem 1.4rem; display: grid; gap: 0.8rem; align-content: start; background: var(--s1); }
.grid4 h3 { margin: 0; font: 600 0.8125rem/1.3 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }
.grid4 h3.code { color: var(--ink); } .grid4 h3.model { color: var(--brand); } .grid4 h3.guard { color: var(--ok); }
.grid4 ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.5rem; }
.grid4 li { display: flex; justify-content: space-between; gap: 1rem; font-size: 0.9375rem; color: var(--ink-2); border-bottom: 1px dashed var(--line); padding-bottom: 0.45rem; }
.grid4 li:last-child { border-bottom: 0; }
.grid4 li b { font: 500 0.8125rem/1.6 var(--mono); color: var(--ink-3); white-space: nowrap; }

.abstract { display: grid; gap: 1rem; }
@media (min-width: 60rem) { .abstract { grid-template-columns: 1fr 19rem; gap: 4rem; } .abstract aside { border-left: 1px solid var(--line); padding-left: 1.5rem; } }
.abstract aside p { font-size: 0.9375rem; color: var(--ink-2); margin-top: 0.6rem; }
.ruleset { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--ink); }
.ruleset li { display: grid; grid-template-columns: 3rem 1fr; gap: 0.3rem 1rem; padding: 1.25rem 0.25rem; border-bottom: 1px solid var(--line); }
.ruleset .n { font: 500 0.8125rem/1.7 var(--mono); color: var(--ink-3); }
.ruleset b { font: 500 1.25rem/1.3 var(--sans); letter-spacing: -0.015em; }
.ruleset p { grid-column: 2; color: var(--ink-2); max-width: 62ch; }

/* small pages (404, security) */
.page { padding-block: clamp(3.5rem, 10vw, 7rem); display: grid; gap: 1.2rem; }
.page .lede { font-size: 1.125rem; color: var(--ink-2); max-width: 40rem; }

/* footer */
.site-foot { border-top: 1px solid var(--line); padding-block: 1.75rem 2.25rem; }
.site-foot .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.75rem 1.5rem; font: 400 0.8125rem/1.5 var(--mono); color: var(--ink-3); letter-spacing: 0.02em; }
.site-foot a { color: var(--ink-2); }

/* small text links get a 44 px hit area without moving the layout */
.more, .back a, .site-foot a { position: relative; }
.more::after, .back a::after, .site-foot a::after { content: ""; position: absolute; inset: -16px -6px; }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }