:root {
  color-scheme: light;
  --canvas: #f2f2f2;
  --surface: #ffffff;
  --surface-alt: #f8f8f8;
  --border: #d8d8d8;
  --border-strong: #a9b2b1;
  --ink: #1a1a1a;
  --ink-soft: #5a5a5a;
  --red: #d82c2c;
  --red-dark: #b82424;
  --red-soft: #faeaea;
  --blue: #0033a0;
  --blue-soft: #e5ebff;
  --font-body: "Avenir Next", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { background: var(--canvas); }

body {
  min-width: 320px;
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(255,255,255,.16);
  background: rgba(26,26,26,.97);
}

.nav-shell {
  width: min(1280px, calc(100% - 48px));
  min-height: 72px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 32px;
}

.brand {
  width: fit-content;
  display: inline-grid;
  grid-template-columns: 42px auto;
  align-items: center;
  gap: 12px;
  color: #fff;
  text-decoration: none;
}

.brand img {
  display: block;
  width: 42px;
  height: 42px;
  border-radius: 8px;
}

.brand-copy { display: grid; gap: 1px; }
.brand-name { font-size: 14px; font-weight: 750; letter-spacing: .06em; text-transform: uppercase; }
.brand-edition { color: #a9b2b1; font-family: var(--font-mono); font-size: 10px; letter-spacing: .08em; text-transform: uppercase; }

.nav-links { display: flex; align-items: center; gap: 24px; }
.nav-links a {
  padding: 8px 0;
  border-bottom: 2px solid transparent;
  color: #d8d8d8;
  font-size: 12px;
  font-weight: 650;
  letter-spacing: .04em;
  text-decoration: none;
  text-transform: uppercase;
  transition: color .2s cubic-bezier(.16,1,.3,1), border-color .2s cubic-bezier(.16,1,.3,1);
}
.nav-links a:hover, .nav-links a:focus-visible, .nav-links a[aria-current="page"] { color: #fff; border-color: var(--red); outline: none; }

.page-shell {
  width: min(1280px, calc(100% - 48px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(260px, .72fr) minmax(0, 1.7fr);
  gap: clamp(48px, 8vw, 112px);
  padding: clamp(56px, 8vw, 112px) 0 88px;
}

.page-intro { position: sticky; top: 128px; align-self: start; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
  color: var(--red);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.eyebrow::before { width: 32px; height: 2px; background: var(--red); content: ""; }

h1 {
  max-width: 9ch;
  margin: 0;
  font-size: clamp(42px, 6vw, 76px);
  font-weight: 750;
  letter-spacing: -.055em;
  line-height: .94;
}

.intro-copy { max-width: 34ch; margin: 28px 0 0; color: var(--ink-soft); }

.edition-note {
  margin-top: 36px;
  padding-top: 18px;
  border-top: 1px solid var(--border-strong);
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .03em;
}

.content { min-width: 0; background: var(--surface); border-top: 8px solid var(--red); }

.content-section {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 24px;
  padding: 38px clamp(26px, 5vw, 64px);
  border-bottom: 1px solid var(--border);
}

.content-section:last-child { border-bottom: 0; }
.section-index { color: var(--red); font-family: var(--font-mono); font-size: 12px; font-weight: 700; }
.section-body { max-width: 72ch; }

h2 { margin: -7px 0 14px; font-size: clamp(20px, 2.2vw, 28px); line-height: 1.18; letter-spacing: -.025em; }
p { margin: 0 0 14px; color: var(--ink-soft); }
p:last-child { margin-bottom: 0; }
strong { color: var(--ink); }
code { padding: 2px 5px; border: 1px solid var(--border); border-radius: 4px; background: var(--surface-alt); color: var(--ink); font-family: var(--font-mono); font-size: .88em; }

.callout { margin-top: 20px; padding: 18px 20px; border-left: 4px solid var(--blue); background: var(--blue-soft); color: #00256f; }
.callout strong { color: #00256f; }

.check-list { margin: 8px 0 0; padding: 0; list-style: none; }
.check-list li { position: relative; padding: 14px 0 14px 28px; border-top: 1px solid var(--border); color: var(--ink-soft); }
.check-list li::before { position: absolute; top: 20px; left: 2px; width: 9px; height: 9px; background: var(--red); content: ""; }

.text-link { color: var(--blue); font-weight: 700; text-underline-offset: 4px; }
.text-link:hover, .text-link:focus-visible { color: var(--red); outline: none; }

.site-footer { border-top: 1px solid var(--border); background: var(--surface); }
.footer-shell {
  width: min(1280px, calc(100% - 48px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 32px;
  padding: 28px 0;
  color: var(--ink-soft);
  font-size: 12px;
}
.footer-shell a { color: var(--blue); font-weight: 700; text-decoration: none; }

@media (max-width: 768px) {
  .nav-shell, .page-shell, .footer-shell { width: min(100% - 32px, 680px); }
  .nav-shell { grid-template-columns: 1fr; gap: 12px; padding: 14px 0; }
  .nav-links { gap: 18px; }
  .page-shell { grid-template-columns: 1fr; gap: 40px; padding: 48px 0 64px; }
  .page-intro { position: static; }
  h1 { max-width: 11ch; font-size: clamp(40px, 14vw, 58px); }
  .content-section { grid-template-columns: 1fr; gap: 10px; padding: 30px 24px; }
  .footer-shell { grid-template-columns: 1fr; gap: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
}