/* railbed.io content pages (about, contact, security, legal, 404). Values mirror
   design-system/tokens/tokens.css (marketing scale, DESIGN.md §4–5); copied to site/public by
   scripts/build-site.py. */
:root {
  color-scheme: light;
  --bg-page: #F6F5F1;
  --bg-surface: #FFFFFF;
  --bg-subtle: #EFEEE9;
  --text-strong: #0E0E0D;
  --text: #2E2D2A;
  --text-body: #5A5955;
  --text-muted: #6A6964;
  --border: #E2E0DA;
  --border-strong: #D6D4CD;
  --ink-hover: #2A2A28;
  --focus-ring: #1F7A4D;
  --font-serif: 'Newsreader', Georgia, 'Times New Roman', serif;
  --font-sans: 'Geist', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --radius-xs: 4px;
  --touch-target: 48px;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg-page);
  color: var(--text-strong);
  font: 400 16px/1.55 var(--font-sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: var(--text-strong); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { text-decoration-color: var(--text-muted); }
:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 2px; border-radius: 2px; }
.skip { position: absolute; left: 16px; top: -48px; padding: 8px 12px; background: var(--text-strong); color: #FFFFFF; border-radius: var(--radius-xs); z-index: 10; }
.skip:focus { top: 12px; }

/* Header */
.top { max-width: 1200px; margin: 0 auto; padding: 22px 20px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand { font: 400 28px/1 var(--font-serif); letter-spacing: -0.02em; text-decoration: none; color: var(--text-strong); }
.top__nav { display: flex; align-items: center; gap: 10px; }
.top__link { font-size: 15px; text-decoration: none; padding: 8px 10px; }
.top__link:hover { opacity: .6; }
.btn { height: 40px; padding: 0 16px; border-radius: var(--radius-xs); display: inline-flex; align-items: center; font-size: 15px; font-weight: 500; text-decoration: none; transition: background-color .2s; white-space: nowrap; }
.btn--line { border: 1px solid var(--text-strong); font-weight: 400; }
.btn--line:hover { background: var(--bg-subtle); }
.btn--ink { background: var(--text-strong); color: #FFFFFF; }
.btn--ink:hover { background: var(--ink-hover); }

/* Document */
.doc { max-width: 720px; margin: 0 auto; padding: 56px 20px 120px; }
.crumbs { display: flex; gap: 8px; font-size: 14px; color: var(--text-muted); margin-bottom: 28px; }
.crumbs a { color: var(--text-muted); text-decoration: none; }
.crumbs a:hover { color: var(--text-strong); }
h1 { font: 400 56px/1.06 var(--font-serif); letter-spacing: -0.028em; margin: 0; text-wrap: balance; }
.doc__meta { margin: 16px 0 0; font-size: 14px; color: var(--text-muted); }
.toc { margin: 40px 0 0; padding: 20px 0; border-top: 1px solid var(--text-strong); border-bottom: 1px solid var(--border); }
.toc__label { margin: 0 0 10px; font-size: 13px; color: var(--text-muted); }
.toc ol { margin: 0; padding-left: 22px; columns: 2; column-gap: 32px; font-size: 15px; line-height: 1.8; }
.toc li { break-inside: avoid; color: var(--text-muted); }
.toc a { text-decoration: none; }
.toc a:hover { text-decoration: underline; }
.prose { margin-top: 40px; }
.prose > :first-child { margin-top: 0; }
.prose h2 { font: 400 30px/1.12 var(--font-serif); letter-spacing: -0.022em; margin: 56px 0 16px; text-wrap: balance; scroll-margin-top: 24px; }
.prose h3 { font: 500 18px/1.35 var(--font-sans); letter-spacing: -0.01em; margin: 32px 0 10px; scroll-margin-top: 24px; }
.prose p, .prose li { font-size: 17px; line-height: 1.65; color: var(--text-body); text-wrap: pretty; }
.prose p { margin: 0 0 16px; }
.prose ul, .prose ol { margin: 0 0 20px; padding-left: 22px; }
.prose li { margin: 0 0 8px; padding-left: 4px; }
.prose strong { color: var(--text); font-weight: 500; }
.prose code { font: 400 15px/1 'Geist Mono', ui-monospace, SFMono-Regular, Menlo, monospace; background: var(--bg-subtle); padding: 2px 5px; border-radius: var(--radius-xs); color: var(--text); }
.prose a { color: var(--text-strong); overflow-wrap: anywhere; }

/* Contact: each purpose reads as a row */
.page--contact .prose h2 { font: 500 18px/1.35 var(--font-sans); letter-spacing: -0.01em; margin: 0; padding-top: 24px; border-top: 1px solid var(--border); }
.page--contact .prose h2 + p { margin-top: 8px; }
.page--contact .prose p + h2 { margin-top: 28px; }

/* Footer */
.foot { max-width: 1200px; margin: 0 auto; padding: 56px 20px 40px; border-top: 1px solid var(--border); }
.foot__top { display: flex; justify-content: space-between; gap: 48px; flex-wrap: wrap; }
.foot__brand p { margin: 12px 0 0; max-width: 280px; font-size: 15px; color: var(--text-muted); }
.foot__cols { display: flex; gap: 72px; flex-wrap: wrap; }
.foot__cols div { display: flex; flex-direction: column; gap: 12px; font-size: 15px; }
.foot__cols a { text-decoration: none; }
.foot__cols a:hover { opacity: .6; }
.foot__label { margin: 0 0 2px; color: var(--text-muted); }
.foot__legal { margin-top: 56px; padding-top: 20px; border-top: 1px solid var(--border); display: flex; justify-content: space-between; gap: 8px 24px; flex-wrap: wrap; font-size: 14px; color: var(--text-muted); }

@media (max-width: 720px) {
  .top__link { display: none; }
  h1 { font-size: 40px; line-height: 1.08; }
  .doc { padding-top: 32px; }
  .toc ol { columns: 1; }
  .prose h2 { font-size: 26px; margin-top: 44px; }
  .foot__cols { gap: 40px; }
}
@media (max-width: 400px) {
  .top { padding: 16px; }
  .btn { padding: 0 12px; font-size: 14px; }
  .brand { font-size: 26px; }
  .doc, .foot { padding-left: 16px; padding-right: 16px; }
}
@media (any-pointer: coarse) {
  .btn, .top__link { min-height: var(--touch-target); }
  .foot__cols a { display: inline-flex; align-items: center; min-height: var(--touch-target); }
  .foot__cols div { gap: 4px; }
}