/* Generated site styles. One file, no framework, no web fonts: the site loads on
   a conference wifi, reads the same in light and dark, and degrades to plain
   readable HTML if this file never arrives. */

:root {
  /* interface palette — independent of the brand palette in docs/brand.md, which
     the mark carries on its own tile so it survives on any background */
  --bg: #ffffff;
  --bg-soft: #f7f9fc;
  --bg-code: #f4f6fa;
  --bg-raised: #ffffff;
  --text: #17212e;
  --text-soft: #5a6675;
  --border: #dde3ec;
  --border-soft: #e9edf4;
  --accent: #0b5cad;
  --accent-hover: #094a8c;
  --on-accent: #ffffff;
  --bad: #b42318;
  --warn: #96590a;
  --ok: #17762f;

  /* the brand colours, used only by the hero band and the mark */
  --brand-deep: #0b3a66;
  --brand-deeper: #082944;
  --brand-pulse: #f0a02a;

  --radius: 10px;
  --radius-lg: 16px;
  --shadow: 0 1px 2px rgb(16 30 48 / 6%), 0 8px 24px -12px rgb(16 30 48 / 18%);
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --page: 74rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c1016;
    --bg-soft: #131923;
    --bg-code: #10161f;
    --bg-raised: #141b25;
    --text: #e7edf5;
    --text-soft: #97a3b3;
    --border: #29323f;
    --border-soft: #1e2632;
    --accent: #74b6f7;
    --accent-hover: #9acbfa;
    --on-accent: #071322;
    --bad: #ff8a70;
    --warn: #e3a83c;
    --ok: #52c46f;
    --shadow: 0 1px 2px rgb(0 0 0 / 40%), 0 10px 30px -14px rgb(0 0 0 / 70%);
  }
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  /* headings must clear the sticky header when an anchor is followed */
  scroll-padding-top: 5.5rem;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.68 var(--sans);
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  overflow-wrap: break-word;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }

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

.skip { position: absolute; left: -9999px; }
.skip:focus {
  left: 1rem;
  top: 0.5rem;
  z-index: 20;
  background: var(--bg);
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

/* header */

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--border-soft);
}

.topbar-inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  max-width: var(--page);
  margin: 0 auto;
  padding: 0.7rem 1.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--mono);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
}
.brand:hover { color: var(--text); text-decoration: none; }
.brand img { display: block; border-radius: 6px; }

.topbar nav {
  display: flex;
  gap: 1.35rem;
  flex-wrap: wrap;
  font-size: 0.94rem;
}

.topbar nav a {
  color: var(--text-soft);
  padding: 0.35rem 0;
  border-bottom: 2px solid transparent;
}
.topbar nav a:hover { color: var(--text); text-decoration: none; }
.topbar nav a.current {
  color: var(--text);
  font-weight: 600;
  border-bottom-color: var(--accent);
}

.topbar .repo { margin-left: auto; font-size: 0.9rem; white-space: nowrap; }

/* hero */

.hero {
  background:
    radial-gradient(70rem 22rem at 18% -8rem, color-mix(in srgb, var(--brand-pulse) 22%, transparent), transparent 70%),
    linear-gradient(160deg, var(--brand-deep), var(--brand-deeper));
  color: #eaf2fb;
  border-bottom: 1px solid var(--border-soft);
}

.hero-inner {
  display: flex;
  align-items: flex-start;
  gap: 1.75rem;
  flex-wrap: wrap;
  max-width: var(--page);
  margin: 0 auto;
  padding: 3.25rem 1.5rem 3rem;
}

.hero-mark {
  margin-top: 0.3rem;
  border-radius: 20px;
  box-shadow: 0 14px 40px -18px rgb(0 0 0 / 80%);
  flex: 0 0 auto;
}

.hero-text { min-width: 0; flex: 1 1 22rem; }

.hero h1 {
  margin: 0 0 0.5rem;
  font-family: var(--mono);
  font-size: clamp(1.9rem, 1.2rem + 2.2vw, 2.7rem);
  letter-spacing: -0.02em;
  color: #ffffff;
}

.hero-tagline {
  margin: 0;
  max-width: 46rem;
  font-size: 1.1rem;
  line-height: 1.55;
  color: #c6d8ec;
}

.hero-actions {
  display: flex;
  gap: 0.7rem;
  flex-wrap: wrap;
  margin: 1.5rem 0 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1.05rem;
  border-radius: 999px;
  border: 1px solid rgb(234 242 251 / 35%);
  color: #eaf2fb;
  font-size: 0.94rem;
  font-weight: 500;
  transition: background-color 0.12s, border-color 0.12s, transform 0.12s;
}
.btn:hover {
  background: rgb(234 242 251 / 12%);
  border-color: rgb(234 242 251 / 60%);
  color: #ffffff;
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--brand-pulse);
  border-color: var(--brand-pulse);
  color: #2b1a02;
  font-weight: 600;
}
.btn-primary:hover {
  background: #ffb648;
  border-color: #ffb648;
  color: #2b1a02;
}

/* layout */

.layout {
  display: grid;
  grid-template-columns: 14rem minmax(0, 1fr);
  gap: 3rem;
  max-width: var(--page);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 5rem;
}

.layout.no-toc { grid-template-columns: minmax(0, 1fr); }

main { min-width: 0; }
main.has-toc > * { max-width: 54rem; }
main.has-toc > .table-wrap, main.has-toc > pre { max-width: none; }

.toc {
  align-self: start;
  position: sticky;
  top: 5rem;
  order: 2;
  font-size: 0.9rem;
}

.toc-title {
  margin: 0 0 0.6rem;
  color: var(--text-soft);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.7rem;
  font-weight: 700;
}

.toc ol { margin: 0; padding: 0; list-style: none; }
.toc li { margin: 0; }
.toc a {
  display: block;
  padding: 0.3rem 0 0.3rem 0.85rem;
  border-left: 2px solid var(--border);
  color: var(--text-soft);
}
.toc a:hover { color: var(--text); text-decoration: none; border-left-color: var(--text-soft); }
.toc a.active {
  color: var(--accent);
  border-left-color: var(--accent);
  font-weight: 600;
}

@media (min-width: 861px) {
  /* the sidebar sits on the left of the grid but after the content in the source */
  .layout { grid-template-areas: "toc main"; }
  .toc { grid-area: toc; }
  main { grid-area: main; }
}

@media (max-width: 860px) {
  .layout { grid-template-columns: minmax(0, 1fr); gap: 1.75rem; padding-top: 1.75rem; }
  .toc {
    position: static;
    order: 0;
    padding-bottom: 1.25rem;
    border-bottom: 1px solid var(--border-soft);
  }
  main.has-toc > * { max-width: none; }
  .hero-inner { padding: 2.25rem 1.25rem; gap: 1.25rem; }
  /* a flex basis wider than the viewport would make the whole page scroll sideways */
  .hero-text { flex-basis: 100%; }
  .hero-mark { width: 64px; height: 64px; border-radius: 15px; }
  .topbar-inner { gap: 0.9rem 1.25rem; }
  .topbar .repo { margin-left: 0; }
}

/* prose */

h1, h2, h3, h4 { line-height: 1.25; letter-spacing: -0.015em; }
h1 { font-size: clamp(1.8rem, 1.3rem + 1.4vw, 2.25rem); margin: 0 0 0.6rem; }
h2 {
  font-size: 1.42rem;
  margin: 3rem 0 1rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px solid var(--border-soft);
}
h3 { font-size: 1.13rem; margin: 2rem 0 0.6rem; }
h4 { font-size: 1rem; margin: 1.5rem 0 0.5rem; }
h1:first-child, h2:first-child, h3:first-child { margin-top: 0; }

.subtitle {
  color: var(--text-soft);
  font-size: 1.1rem;
  line-height: 1.55;
  margin: 0 0 2rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-soft);
}

p, ul, ol { margin: 0 0 1.1rem; }
li { margin: 0.35rem 0; }
li > ul, li > ol { margin: 0.4rem 0 0.6rem; }
strong { font-weight: 650; }

hr { border: 0; border-top: 1px solid var(--border); margin: 2.5rem 0; }

.anchor {
  margin-left: 0.45rem;
  color: var(--border);
  font-weight: 400;
  text-decoration: none;
  opacity: 0;
  transition: opacity 0.12s;
}
h1:hover .anchor, h2:hover .anchor, h3:hover .anchor, h4:hover .anchor,
.anchor:focus-visible { opacity: 1; }
.anchor:hover { color: var(--accent); text-decoration: none; }

/* code */

code {
  font-family: var(--mono);
  font-size: 0.87em;
  background: var(--bg-code);
  border: 1px solid var(--border-soft);
  border-radius: 5px;
  padding: 0.12em 0.35em;
  overflow-wrap: break-word;
}

.code-block {
  position: relative;
  margin: 0 0 1.4rem;
}

pre {
  background: var(--bg-code);
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  overflow-x: auto;
  margin: 0 0 1.4rem;
  box-shadow: var(--shadow);
}

.code-block pre { margin: 0; }

pre::-webkit-scrollbar { height: 9px; }
pre::-webkit-scrollbar-track { background: transparent; }
pre::-webkit-scrollbar-thumb { background: var(--border); border-radius: 5px; }

pre code {
  background: none;
  border: 0;
  padding: 0;
  font-size: 0.82rem;
  line-height: 1.6;
  white-space: pre;
}

.copy {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  padding: 0.25rem 0.6rem;
  font: 600 0.72rem/1.6 var(--sans);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--text-soft);
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  opacity: 0.55;
  transition: opacity 0.12s, color 0.12s;
}
.code-block:hover .copy, .copy:focus-visible { opacity: 1; }
.copy:hover { color: var(--text); }
.copy[data-done="true"] { color: var(--ok); opacity: 1; }

/* tables */

.table-wrap {
  overflow-x: auto;
  margin: 0 0 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-raised);
}

table { border-collapse: collapse; width: 100%; font-size: 0.92rem; }
th, td { text-align: left; padding: 0.6rem 0.85rem; vertical-align: top; }
thead th {
  background: var(--bg-soft);
  font-weight: 650;
  font-size: 0.82rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--text-soft);
  white-space: nowrap;
}
tbody tr + tr td { border-top: 1px solid var(--border-soft); }
tbody tr:hover td { background: var(--bg-soft); }

/* rule reference */

.severity {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin: 0 0 1.75rem;
  padding: 0;
  list-style: none;
}
.severity li {
  margin: 0;
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  font-size: 0.88rem;
  color: var(--text-soft);
  background: var(--bg-soft);
  border: 1px solid var(--border-soft);
  border-radius: 999px;
  padding: 0.3rem 0.8rem;
}
.severity code {
  border: 0;
  background: none;
  padding: 0;
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
}
.severity .bad code { color: var(--bad); }
.severity .warn code { color: var(--warn); }
.severity .ok code { color: var(--ok); }
.severity .error code { color: var(--text-soft); }

.rule-search {
  display: flex;
  gap: 0.9rem;
  align-items: center;
  flex-wrap: wrap;
  position: sticky;
  top: 4.2rem;
  z-index: 4;
  margin: 0 0 2rem;
  padding: 0.75rem 0;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(8px);
}

.rule-search input {
  flex: 1 1 20rem;
  font: inherit;
  color: inherit;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.55rem 1rem;
  box-shadow: var(--shadow);
}
.rule-search input::placeholder { color: var(--text-soft); }
.rule-search .count { color: var(--text-soft); font-size: 0.88rem; font-variant-numeric: tabular-nums; }

.category { margin: 0 0 2.5rem; }
.category h2 { display: flex; align-items: baseline; gap: 0.6rem; flex-wrap: wrap; }
.category h2 code {
  background: none;
  border: 0;
  padding: 0;
  font-size: 1em;
  color: var(--text);
}
.category-count { color: var(--text-soft); font-weight: 400; font-size: 0.85rem; }

.rules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 23rem), 1fr));
  align-items: start;
  gap: 0.9rem;
}

.rule {
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  margin: 0;
  background: var(--bg-raised);
  transition: box-shadow 0.12s, transform 0.12s;
}
.rule:hover { box-shadow: var(--shadow); transform: translateY(-1px); }
.rule:target { border-left-color: var(--brand-pulse); box-shadow: var(--shadow); }

.rule h3 {
  margin: 0 0 0.5rem;
  font-family: var(--mono);
  font-size: 0.93rem;
  letter-spacing: 0;
}
.rule h3 a { color: var(--accent); }
.rule .title { font-weight: 650; margin: 0 0 0.45rem; line-height: 1.4; }
.rule .rationale { margin: 0; color: var(--text-soft); font-size: 0.93rem; }
.rule[hidden] { display: none; }
.category[hidden] { display: none; }

/* footer */

footer {
  border-top: 1px solid var(--border-soft);
  background: var(--bg-soft);
  padding: 2.25rem 1.5rem 2.75rem;
  color: var(--text-soft);
  font-size: 0.88rem;
}

.footer-inner { max-width: var(--page); margin: 0 auto; }
.footer-inner p { margin: 0 0 0.5rem; max-width: 60rem; }
.footer-inner .generated { margin: 0.9rem 0 0; font-size: 0.83rem; }
.footer-brand { font-size: 0.95rem; }