/* riprap.dev — design system.
 *
 * Hand-written, token-driven, no framework and no build step. Plain CSS with no front
 * matter is copied byte-for-byte by Jekyll, so what you preview is exactly what ships.
 *
 * Two rules hold the whole file together:
 *   1. Components read tokens and never literal colours, so the dark theme costs no
 *      component rules — only the token block below is redeclared.
 *   2. Every non-obvious rule states why, and where there was a failure to avoid, names it.
 */

/* ---------------------------------------------------------------------------
 * 1. Tokens
 * ------------------------------------------------------------------------ */
:root {
  --primary: #2563eb;
  --primary-strong: #1d4ed8;
  --secondary: #7c3aed;
  --accent: #06b6d4;

  /* Three surfaces: page, band, raised. In light mode band and raised are both white; in
   * dark mode they separate into three real steps, which is what stops a dark page reading
   * as one flat sheet. */
  --surface: #f8fafc;
  --surface-alt: #ffffff;
  --surface-raised: #ffffff;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;

  --text: #1e293b;
  --text-strong: #0f172a;
  --text-muted: #64748b;

  --tag-bg: #eef2ff;
  --tag-text: #4338ca;
  --code-bg: #f1f5f9;
  --nav-bg: rgba(248, 250, 252, .85);

  --gradient-primary: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);

  --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, .05);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, .08), 0 2px 4px -2px rgba(15, 23, 42, .05);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, .1), 0 4px 6px -4px rgba(15, 23, 42, .05);

  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 20px;
  --nav-height: 70px;
  --transition: .25s ease;

  /* Reference prose is read line by line, not skimmed. 72ch lands near the top of the
   * comfortable 65–75 character measure; a fixed 760px box works out at about 85. */
  --measure: 72ch;

  --font-main: Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* Syntax highlighting needs its own scale rather than reusing the brand tokens: --accent
   * on --code-bg fails contrast in light mode, and a keyword the same colour as a link
   * reads as clickable. */
  --syn-comment: #64748b;
  --syn-keyword: #7c3aed;
  --syn-string: #0e7490;
  --syn-builtin: #1d4ed8;
  --syn-attr: #b45309;
}

[data-theme='dark'] {
  --primary: #60a5fa;
  --primary-strong: #3b82f6;
  --secondary: #a78bfa;
  --accent: #22d3ee;

  --surface: #0f172a;
  --surface-alt: #131f38;
  --surface-raised: #1e293b;
  --border: #334155;
  --border-strong: #475569;

  --text: #cbd5e1;
  --text-strong: #f1f5f9;
  --text-muted: #94a3b8;

  --tag-bg: #1e293b;
  --tag-text: #a5b4fc;
  --code-bg: #131f38;
  --nav-bg: rgba(15, 23, 42, .85);

  --gradient-primary: linear-gradient(135deg, #60a5fa 0%, #a78bfa 100%);

  /* Re-tinted to pure black at higher alpha. A slate-tinted shadow is invisible against a
   * slate surface, which is how dark themes end up with no depth at all. */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .4), 0 2px 4px -2px rgba(0, 0, 0, .3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .5), 0 4px 6px -4px rgba(0, 0, 0, .4);

  --syn-comment: #94a3b8;
  --syn-keyword: #c4b5fd;
  --syn-string: #67e8f9;
  --syn-builtin: #93c5fd;
  --syn-attr: #fbbf24;
}

/* ---------------------------------------------------------------------------
 * 2. Reset and page frame
 * ------------------------------------------------------------------------ */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  /* Anchor targets must clear the fixed navbar. riprap.dev/#license is printed into
   * adopters' terminals by the installer; landing underneath the bar is a visible bug. */
  scroll-padding-top: calc(var(--nav-height) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--surface);
  color: var(--text);
  font-family: var(--font-main);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Deliberately no `overflow-x: hidden` on body. It would swallow the overflow of a wide
 * table instead of letting it scroll in its own box, and it breaks position: sticky. Wide
 * children are constrained where they occur instead. */

img, svg { max-width: 100%; }

h1, h2, h3, h4 {
  margin: 0;
  color: var(--text-strong);
  font-weight: 700;
  line-height: 1.2;
  overflow-wrap: break-word;
}

p, ul, ol, pre, table, blockquote, figure { margin: 0; }

a { color: var(--primary); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--primary-strong); }

/* ---------------------------------------------------------------------------
 * 3. Focus, skip link, gradient text
 * ------------------------------------------------------------------------ */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: 12px;
  z-index: 1100;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  background: var(--surface-raised);
  color: var(--text-strong);
  box-shadow: var(--shadow-lg);
  text-decoration: none;
  /* Hidden by its own height rather than by a fixed negative offset. A fixed offset has to
   * out-reach the element AND its shadow: --shadow-lg extends 25px past the box, so an
   * off-screen skip link still painted a dark smudge across the top of every page. A
   * percentage transform moves the shadow with it, whatever the text size turns out to be. */
  transform: translateY(-200%);
  transition: transform var(--transition);
}
.skip-link:focus { transform: translateY(0); }

/* One implementation, with the solid fallback declared inside it. Where background-clip:
 * text is unsupported or blocked, -webkit-text-fill-color leaves the text invisible — so
 * the fallback cannot live in the callers, where it gets forgotten. */
.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--primary);
}

/* ---------------------------------------------------------------------------
 * 4. Type scale
 * ------------------------------------------------------------------------ */
.section-eyebrow {
  margin: 0 0 10px;
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
}
.section-eyebrow-dash { display: flex; align-items: center; gap: 12px; }
.section-eyebrow-dash::before {
  content: '';
  width: 32px;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-primary);
  /* The dash is a sibling of gradient text, so it must not inherit the transparent fill. */
  -webkit-text-fill-color: initial;
}

.lede {
  max-width: 62ch;
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* ---------------------------------------------------------------------------
 * 5. Containers
 * ------------------------------------------------------------------------ */
.container { width: 100%; max-width: 1160px; margin: 0 auto; padding: 0 24px; }
.prose { max-width: var(--measure); }

/* The landing page runs card grids, directory trees and tables that want the hero's full
 * width, but its paragraphs still want a reading measure. Constraining the text children
 * rather than the column keeps both, and keeps the wide blocks aligned with the hero above
 * them — a narrower column under a full-width hero reads as though the page slipped left. */
.prose-home { max-width: none; }
.prose-home > p,
.prose-home > h2,
.prose-home > h3,
.prose-home > ol,
.prose-home > blockquote,
.prose-home > ul:not(.incidents):not(.doc-links) { max-width: var(--measure); }

/* ---------------------------------------------------------------------------
 * 6. Navbar
 * ------------------------------------------------------------------------ */
.navbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 1000;
  height: var(--nav-height);
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  /* Transparent at rest and coloured once scrolled, so the bar only asserts itself when it
   * is actually overlapping content. The border is declared here rather than added later so
   * the transition has something to animate from and the page does not shift by 1px. */
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.navbar.scrolled { border-bottom-color: var(--border); box-shadow: var(--shadow-sm); }

.nav-container { display: flex; align-items: center; gap: 24px; height: 100%; }

.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: -.02em;
  text-decoration: none;
}
.nav-mark { width: 22px; height: 22px; fill: var(--primary); flex: none; }

.nav-menu {
  display: flex;
  gap: 4px;
  margin: 0 auto 0 8px;
  padding: 0;
  list-style: none;
}
.nav-link {
  position: relative;
  display: block;
  padding: 8px 10px;
  color: var(--text);
  font-size: .95rem;
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition);
}
.nav-link:hover, .nav-link.active { color: var(--text-strong); }
.nav-link::after {
  content: '';
  position: absolute;
  left: 10px;
  bottom: 2px;
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition);
}
.nav-link:hover::after, .nav-link.active::after { width: calc(100% - 20px); }

.nav-actions { display: flex; align-items: center; gap: 8px; margin-left: auto; }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-raised);
  color: var(--text);
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition);
}
.theme-toggle:hover { border-color: var(--border-strong); color: var(--text-strong); }
.icon { width: 16px; height: 16px; flex: none; }
.icon-sun, .icon-moon { fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; }
.icon-moon { display: none; }
[data-theme='dark'] .icon-sun { display: none; }
[data-theme='dark'] .icon-moon { display: block; }
.icon-source { fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 36px;
  height: 36px;
  padding: 0 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-raised);
  cursor: pointer;
}
.hamburger .bar { height: 2px; border-radius: 2px; background: var(--text); transition: var(--transition); }
.hamburger[aria-expanded='true'] .bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.hamburger[aria-expanded='true'] .bar:nth-child(2) { opacity: 0; }
.hamburger[aria-expanded='true'] .bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------------------------------------------------------------------------
 * 7. Buttons
 * ------------------------------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: .95rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.btn-sm { padding: 7px 12px; font-size: .875rem; font-weight: 500; }
.btn-primary { background: var(--gradient-primary); color: #fff; box-shadow: var(--shadow-sm); }
.btn-primary:hover { color: #fff; transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-ghost {
  border-color: var(--border);
  background: var(--surface-raised);
  color: var(--text-strong);
}
.btn-ghost:hover { border-color: var(--border-strong); color: var(--text-strong); transform: translateY(-2px); }

/* ---------------------------------------------------------------------------
 * 8. Hero and page head
 * ------------------------------------------------------------------------ */
.hero {
  padding: calc(var(--nav-height) + 72px) 0 72px;
  background: var(--surface-alt);
  border-bottom: 1px solid var(--border);
}
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
/* A grid item defaults to min-width: auto, so a track cannot shrink below its content's
 * min-content width — the terminal's longest command line was holding the whole hero 15px
 * wider than a 360px phone, and the page scrolled sideways. The scroll belongs to the
 * terminal, not the document. */
.hero-grid > * { min-width: 0; }
.hero-title {
  font-size: clamp(2.25rem, 5.5vw, 3.4rem);
  font-weight: 800;
  letter-spacing: -.03em;
}
.hero-lede {
  max-width: 52ch;
  margin-top: 18px;
  color: var(--text-muted);
  font-size: 1.1rem;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }

.hero-release {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 16px 7px 12px;
  margin-bottom: 22px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-raised);
  box-shadow: var(--shadow-sm);
  color: var(--text-strong);
  font-size: .8125rem;
  font-weight: 500;
  text-decoration: none;
  transition: border-color var(--transition), transform var(--transition);
}
.hero-release:hover { border-color: var(--border-strong); color: var(--text-strong); transform: translateY(-1px); }
.hero-release-dot { width: 7px; height: 7px; min-width: 7px; border-radius: 50%; background: var(--gradient-primary); }

.terminal {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-raised);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.terminal-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--code-bg);
}
.terminal-bar .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--border-strong); }
.terminal-title {
  margin-left: 8px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: .75rem;
}
.terminal-body {
  padding: 16px 18px;
  color: var(--text-strong);
  font-family: var(--font-mono);
  font-size: .85rem;
  line-height: 1.9;
  overflow-x: auto;
}
.terminal-prompt { color: var(--primary); user-select: none; }
.hero-aside-note { margin-top: 12px; color: var(--text-muted); font-size: .875rem; }

.page-head {
  padding: calc(var(--nav-height) + 56px) 0 40px;
  background: var(--surface-alt);
  border-bottom: 1px solid var(--border);
}
.page-head h1 { font-size: clamp(1.9rem, 4.5vw, 2.6rem); letter-spacing: -.02em; }
.page-head .lede { margin-top: 14px; }

/* ---------------------------------------------------------------------------
 * 9. Prose register
 * ------------------------------------------------------------------------ */
.prose { padding: 48px 0 72px; font-size: 1.05rem; }
/* These docs are full of strings like bin/hooks/riprap/lib/secret-patterns.local.sh. Without
 * this they push the page wider than a phone viewport. */
.prose { overflow-wrap: anywhere; }
.prose > * + * { margin-top: 20px; }

.prose h2 {
  margin-top: 48px;
  font-size: clamp(1.4rem, 1.1rem + 1.1vw, 1.75rem);
  letter-spacing: -.01em;
}
.prose h3 { margin-top: 34px; font-size: 1.15rem; }
.prose h2 + *, .prose h3 + * { margin-top: 12px; }

.prose ul, .prose ol { padding-left: 22px; }
.prose li + li { margin-top: 8px; }
.prose li::marker { color: var(--primary); }

.prose strong { color: var(--text-strong); font-weight: 600; }

.prose blockquote {
  padding: 4px 0 4px 20px;
  border-left: 3px solid var(--primary);
  color: var(--text-muted);
  font-style: italic;
}

.prose hr { margin-top: 44px; border: 0; border-top: 1px solid var(--border); }

/* Callouts are blockquotes with a kramdown attribute list, so the markdown needs no raw
 * HTML: `{: .callout .callout-warn}` on the line after the quote. */
.prose .callout {
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-left: 3px solid var(--primary);
  border-radius: var(--radius-sm);
  background: var(--surface-raised);
  box-shadow: var(--shadow-sm);
  color: var(--text);
  font-style: normal;
}
.prose .callout-warn { border-left-color: var(--secondary); }
.prose .callout > * + * { margin-top: 10px; }

/* ---------------------------------------------------------------------------
 * 10. Tables
 * ------------------------------------------------------------------------ */
.prose table { width: 100%; border-collapse: collapse; font-size: .94rem; }
.prose th, .prose td { padding: 10px 12px; border: 1px solid var(--border); vertical-align: top; text-align: left; }
.prose thead th { background: var(--code-bg); color: var(--text-strong); }
.prose td code, .prose th code { white-space: nowrap; }

/* The two-tier table is the one place asymmetry is the whole point: one row is riprap's and
 * one is yours. Matching borders make it read as two equivalent options. */
.prose .tiers tbody tr:first-child { background: var(--tag-bg); }
.prose .tiers tbody tr:first-child td:first-child { color: var(--tag-text); font-weight: 600; }
.prose .tiers tbody tr:last-child td:first-child { color: var(--text-strong); font-weight: 600; }

/* ---------------------------------------------------------------------------
 * 11. Code
 * ------------------------------------------------------------------------ */
/* Two markups reach here: a bare fence emits <pre><code>, a language-tagged fence emits
 * div.highlighter-rouge > div.highlight > pre.highlight > code. Both appear in these docs,
 * so the box is the <pre> and the wrapper divs are neutralised — otherwise every tagged
 * block gets a double frame.
 *
 * The `div` qualifier is load-bearing: kramdown puts class="highlight" on the <pre> as well
 * as on its wrapper, so an unqualified .highlight strips the border and padding from the one
 * element that is supposed to have them, and every code block renders as bare text. */
.prose div.highlighter-rouge, .prose div.highlight { margin: 0; padding: 0; border: 0; background: none; }
.prose div.highlighter-rouge + * { margin-top: 20px; }

.prose pre {
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--code-bg);
  font-family: var(--font-mono);
  font-size: .875rem;
  line-height: 1.6;
  tab-size: 2;
  overflow-x: auto;
}
/* :not(pre) > code rather than styling code and unsetting it inside pre: one rule instead
 * of two, and it cannot be defeated by kramdown tagging inline code. */
.prose :not(pre) > code {
  padding: .15em .4em;
  border-radius: 5px;
  background: var(--code-bg);
  font-family: var(--font-mono);
  font-size: .88em;
}
.prose pre code { padding: 0; background: none; font-size: inherit; }

/* Directory trees carry their meaning in the column alignment, so they must never wrap. */
.prose pre.tree, .prose .tree pre { white-space: pre; }
.tree-pair { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(320px, 100%), 1fr)); gap: 24px; }
.tree-pair h3 { margin-top: 0; font-size: 1rem; }
.tree-pair > div > * + * { margin-top: 12px; }

/* Only the Rouge classes shell, yaml and json actually emit. A full theme is 200 lines of
 * rules for tokens no page here produces. */
.prose .highlight .c, .prose .highlight .c1, .prose .highlight .cm { color: var(--syn-comment); font-style: italic; }
.prose .highlight .k, .prose .highlight .kd, .prose .highlight .kn { color: var(--syn-keyword); }
.prose .highlight .nb, .prose .highlight .nf, .prose .highlight .nv { color: var(--syn-builtin); }
.prose .highlight .s, .prose .highlight .s1, .prose .highlight .s2, .prose .highlight .se { color: var(--syn-string); }
.prose .highlight .na, .prose .highlight .nt { color: var(--syn-attr); }
.prose .highlight .o, .prose .highlight .p { color: var(--text-muted); }

/* ---------------------------------------------------------------------------
 * 12. Table of contents
 * ------------------------------------------------------------------------ */
.prose .toc {
  padding: 18px 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-raised);
  box-shadow: var(--shadow-sm);
}
.prose .toc-title {
  margin: 0 0 8px;
  color: var(--text-muted);
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.prose .toc ul { margin: 0; padding-left: 18px; list-style: none; }
.prose .toc > ul { padding-left: 0; }
.prose .toc li { margin-top: 4px; font-size: .94rem; }
.prose .toc li + li { margin-top: 4px; }
.prose .toc a { text-decoration: none; }
.prose .toc a:hover { text-decoration: underline; }

/* Heading anchors are added by site.js. Hidden until the heading is hovered or the link
 * itself is focused, so a keyboard user can still reach them. */
.heading-anchor {
  margin-left: .4em;
  color: var(--text-muted);
  font-weight: 400;
  text-decoration: none;
  opacity: 0;
  transition: opacity var(--transition);
}
h2:hover > .heading-anchor, h3:hover > .heading-anchor, .heading-anchor:focus { opacity: 1; }

/* ---------------------------------------------------------------------------
 * 13. List containers and cards
 * ------------------------------------------------------------------------ */
.prose .doc-links {
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-raised);
  box-shadow: var(--shadow-sm);
  list-style: none;
  overflow: hidden;
}
.prose .doc-links li { margin: 0; padding: 15px 20px; transition: background-color var(--transition); }
.prose .doc-links li + li { margin-top: 0; border-top: 1px solid var(--border); }
.prose .doc-links li:hover { background: var(--tag-bg); }

/* The incident list. Every card is the same three parts — the control, what happened, what
 * it cost — because the repeated shape is what shows the claim is systematic rather than a
 * collection of anecdotes. */
.prose .incidents {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(300px, 100%), 1fr));
  gap: 18px;
  padding: 0;
  list-style: none;
}
.prose .incidents li {
  margin: 0;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-raised);
  box-shadow: var(--shadow-sm);
  font-size: .96rem;
  transition: transform var(--transition), box-shadow var(--transition);
}
.prose .incidents li:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }

/* The provenance band. The four figures describe the codebase riprap was distilled from,
 * which is not what it ships — so the caption underneath is load-bearing, not decoration. */
.provenance {
  padding: 24px;
  border: 1px solid var(--border);
  border-left: 3px solid var(--primary);
  border-radius: var(--radius);
  background: var(--surface-raised);
  box-shadow: var(--shadow-sm);
}
.provenance > * + * { margin-top: 14px; }
.provenance-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(120px, 100%), 1fr));
  gap: 16px;
  padding: 0;
  list-style: none;
}
.provenance-stats li { margin: 0; }
.provenance-stats b {
  display: block;
  color: var(--text-strong);
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -.02em;
  font-variant-numeric: tabular-nums;
}
.provenance-stats span { color: var(--text-muted); font-size: .85rem; }
.provenance-note { color: var(--text-muted); font-size: .9rem; }

/* Honest limits stays the plainest thing on the page. Styling an admission makes it look
 * like a feature. */
.prose .limits { padding-left: 22px; }
.prose .limits li { color: var(--text); }

/* ---------------------------------------------------------------------------
 * 14. Footer
 * ------------------------------------------------------------------------ */
.footer {
  padding: 48px 0;
  border-top: 1px solid var(--border);
  background: var(--surface-alt);
}
.footer-content { display: flex; flex-direction: column; align-items: center; gap: 10px; text-align: center; }
.footer-brand { font-size: 1.1rem; font-weight: 800; letter-spacing: -.02em; }
.footer-note { max-width: 56ch; color: var(--text-muted); font-size: .9rem; }
.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 20px;
  margin: 6px 0 0;
  padding: 0;
  list-style: none;
  font-size: .9rem;
}
/* The organisation credit sits below the links and reads quieter than them: it is
 * attribution, not navigation, and should not compete with Licence or Source for the
 * eye. Only the name is a link, so the whole line does not look clickable. */
.footer-powered {
  margin-top: 4px;
  color: var(--text-muted);
  font-size: .85rem;
}

/* ---------------------------------------------------------------------------
 * 15. Narrow screens
 * ------------------------------------------------------------------------ */
@media (max-width: 900px) {
  /* Lead with the copy once the columns stack — the terminal is evidence, not the pitch. */
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
  .hero { padding: calc(var(--nav-height) + 48px) 0 56px; }
}

@media (max-width: 760px) {
  .nav-menu {
    position: fixed;
    inset: var(--nav-height) 0 auto 0;
    flex-direction: column;
    gap: 0;
    margin: 0;
    padding: 8px 24px 20px;
    border-bottom: 1px solid var(--border);
    background: var(--surface-alt);
    box-shadow: var(--shadow-lg);
    transform: translateY(-140%);
    transition: transform var(--transition);
  }
  .nav-menu.open { transform: translateY(0); }
  .nav-link { padding: 12px 0; }
  .nav-link::after { display: none; }
  .hamburger { display: flex; }
  .nav-source span, .nav-source { display: none; }
  .prose { padding: 32px 0 56px; }
  .prose h2 { margin-top: 40px; }

  /* A table read on a phone stops being a table: swiping sideways to follow a row is a
   * worse reading motion than scrolling down, no matter how well-signposted the scroll is.
   * Each row becomes a card instead, and each cell a labelled field — the label is each
   * column's header, copied onto a data-label attribute by site.js, since kramdown has no
   * way to attach one from plain pipe-table syntax. */
  .prose table { display: block; }
  .prose thead { display: none; }
  .prose tbody { display: block; }
  .prose tr {
    display: block;
    padding: 14px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface-alt);
    box-shadow: var(--shadow-sm);
  }
  .prose tr + tr { margin-top: 12px; }
  .prose td {
    display: block;
    padding: 7px 0;
    border: none;
    border-top: 1px solid var(--border);
  }
  /* The first cell is the row's identity (a stage, a hook) — it reads as the card's title,
   * not another labelled field. */
  .prose td:first-child { padding-top: 0; border-top: none; font-weight: 600; color: var(--text-strong); }
  .prose td::before {
    content: attr(data-label);
    display: block;
    margin-bottom: 2px;
    font-size: .72rem;
    font-weight: 600;
    letter-spacing: .05em;
    text-transform: uppercase;
    color: var(--text-muted);
  }
  .prose td:first-child::before { content: none; }
}

@media (max-width: 520px) {
  .container { padding: 0 18px; }
  .prose { font-size: 1rem; }
  .prose table { font-size: .88rem; }
  .provenance-stats b { font-size: 1.3rem; }
}

/* ---------------------------------------------------------------------------
 * 16. Reduced motion
 * ------------------------------------------------------------------------ */
/* There are no scroll-reveal animations on this site, deliberately: content that is hidden
 * until an observer fires is content that can fail to appear. Only transitions need muting.
 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}