/*
 * Sixteenths — marketing and legal site.
 *
 * Palette and type lifted from app/src/theme/tokens.ts (the DARK theme) and
 * DESIGN-BRIEF.md §3, so the site and the app read as one thing. The display
 * is a steel tape measure; the result sits on blade stock.
 *
 * Fonts are self-hosted, not pulled from Google. The app ships with "no
 * account, no ads and no tracking" on the store page — a site that leaks every
 * visitor to a third party while saying that would be a lie by omission.
 */

/* ── fonts (SIL OFL, see /OFL.txt) ─────────────────────────────────────────── */

@font-face {
  font-family: 'Barlow Condensed';
  src: url('fonts/barlow-condensed-600.woff2') format('woff2');
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Barlow Condensed';
  src: url('fonts/barlow-condensed-700.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Space Mono';
  src: url('fonts/space-mono-400.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Space Mono';
  src: url('fonts/space-mono-700.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

/* ── tokens ────────────────────────────────────────────────────────────────── */

:root {
  --bg: #3a3a38;
  --bg-deep: #262623;
  --bg-black: #191917;
  --surface: #2e2e2b;
  --surface-alt: #4c4c48;
  --ink: #ffffff;
  --ink-muted: #c9c7be;
  --ink-dim: #8e8d87;
  --rule: #4c4c48;
  --accent: #f5c518;
  --on-accent: #191917;
  --pass: #7fd69a;
  --fail: #ff6b4a;
  --warn: #e6a54a;

  --display: 'Barlow Condensed', 'Helvetica Neue', Arial, sans-serif;
  --label: 'Space Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  /* Long prose reads better in the reader's own UI face than in a condensed
     display face. The legal pages are long. */
  --prose: ui-sans-serif, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    Helvetica, Arial, sans-serif;

  --wide: 1120px;
  --narrow: 720px;
  --pad: clamp(20px, 5vw, 56px);
}

/* ── base ─────────────────────────────────────────────────────────────────── */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--prose);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--ink);
}

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

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--on-accent);
  padding: 12px 20px;
  font: 700 14px var(--label);
  z-index: 50;
}

.skip:focus {
  left: 0;
}

.wrap {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 0 var(--pad);
}

.wrap--narrow {
  max-width: var(--narrow);
}

/* ── the tape rule ────────────────────────────────────────────────────────── */
/*
 * Three layers of the same repeating gradient at three heights: minor tick
 * every 32px, mid every 64px, major every 128px, all anchored to the baseline.
 * Cheaper than the 40 hand-placed spans the store screenshots use, and it
 * reflows at any width.
 */

.tick {
  height: 18px;
  background-repeat: repeat-x;
  background-position: bottom left;
  background-image: repeating-linear-gradient(90deg, var(--accent) 0 2px, transparent 2px 32px),
    repeating-linear-gradient(90deg, var(--accent) 0 2px, transparent 2px 64px),
    repeating-linear-gradient(90deg, var(--accent) 0 2px, transparent 2px 128px);
  background-size: 100% 7px, 100% 11px, 100% 18px;
}

.tick--dark {
  background-image: repeating-linear-gradient(90deg, var(--on-accent) 0 2px, transparent 2px 32px),
    repeating-linear-gradient(90deg, var(--on-accent) 0 2px, transparent 2px 64px),
    repeating-linear-gradient(90deg, var(--on-accent) 0 2px, transparent 2px 128px);
}

/* ── header ───────────────────────────────────────────────────────────────── */

.site-head {
  border-bottom: 1px solid var(--rule);
  background: var(--bg-deep);
  position: sticky;
  top: 0;
  z-index: 20;
}

.site-head__in {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 68px;
  flex-wrap: wrap;
  padding-block: 10px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  text-decoration: none;
  font: 700 24px/1 var(--display);
  letter-spacing: 0.02em;
}

.brand:hover {
  color: var(--accent);
}

.brand svg {
  width: 30px;
  height: 30px;
  border-radius: 6px;
  flex: none;
}

.nav {
  display: flex;
  align-items: center;
  gap: clamp(14px, 3vw, 30px);
  font: 700 12px var(--label);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.nav a {
  color: var(--ink-muted);
  text-decoration: none;
}

.nav a:hover,
.nav a[aria-current='page'] {
  color: var(--accent);
}

/* ── hero ─────────────────────────────────────────────────────────────────── */

.hero {
  background: var(--bg-deep);
  padding: clamp(48px, 8vw, 92px) 0 0;
  border-bottom: 1px solid var(--rule);
}

.hero__grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(32px, 6vw, 72px);
  align-items: center;
}

@media (max-width: 900px) {
  .hero__grid {
    grid-template-columns: 1fr;
  }
}

.eyebrow {
  font: 700 12px var(--label);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 18px;
}

.hero h1 {
  font: 700 clamp(44px, 7vw, 82px)/0.98 var(--display);
  letter-spacing: 0.005em;
  margin: 0 0 22px;
  text-wrap: balance;
}

.hero__sub {
  font-size: clamp(17px, 2vw, 20px);
  color: var(--ink-muted);
  margin: 0 0 32px;
  max-width: 46ch;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  margin-bottom: 26px;
}

.hero__note {
  font: 400 13px/1.6 var(--label);
  color: var(--ink-dim);
  margin: 0;
  max-width: 48ch;
}

/* ── buttons ──────────────────────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 26px;
  border-radius: 3px;
  border: 1px solid transparent;
  font: 600 19px/1 var(--display);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.12s ease, background 0.12s ease, color 0.12s ease;
}

.btn--primary {
  background: var(--accent);
  color: var(--on-accent);
  border-bottom: 3px solid #b08f00;
}

.btn--primary:hover {
  color: var(--on-accent);
  transform: translateY(-1px);
}

.btn--ghost {
  border: 1px solid var(--surface-alt);
  color: var(--ink);
  background: transparent;
}

.btn--ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn[aria-disabled='true'] {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}

/* ── the blade: a scaled-down copy of the app's result display ────────────── */

.blade {
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 6px;
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.4);
}

.blade__status {
  display: flex;
  justify-content: space-between;
  padding: 12px 18px 8px;
  font: 700 11px var(--label);
  letter-spacing: 0.08em;
  color: var(--accent);
}

.blade__status .awake {
  color: var(--pass);
}

.blade__rows {
  padding: 0 18px 12px;
}

.blade__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 7px 0;
  border-bottom: 1px solid var(--rule);
  gap: 16px;
}

.blade__row span:first-child {
  font: 400 15px var(--label);
  color: var(--ink-muted);
}

.blade__row span:last-child {
  font: 700 10px var(--label);
  letter-spacing: 0.12em;
  color: var(--ink-dim);
}

.blade__chips {
  display: flex;
  gap: 6px;
  padding: 4px 18px 16px;
}

.chip {
  flex: 1;
  padding: 7px 9px;
  border-radius: 2px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

/* Solid = entered. Hairline + "=" = computed. Luminance-first, so the
   distinction survives without relying on hue. DESIGN-BRIEF §3. */
.chip--entered {
  background: var(--accent);
  color: var(--on-accent);
}

.chip--computed {
  border: 1px solid var(--accent);
  color: var(--ink);
}

.chip__label {
  font: 700 9px var(--label);
  letter-spacing: 0.1em;
}

.chip--computed .chip__label {
  color: var(--accent);
}

.chip__val {
  font: 700 18px/1 var(--display);
  white-space: nowrap;
}

.blade__work {
  padding: 0 18px 8px;
  font: 400 13px var(--label);
  color: var(--ink-dim);
}

.blade__result {
  background: var(--accent);
  color: var(--on-accent);
  border-top: 3px solid var(--on-accent);
  border-bottom: 3px solid var(--on-accent);
  padding: 10px 0 0;
}

.blade__result .tick {
  margin: 0 16px;
  height: 18px;
}

.blade__meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 6px 18px 0;
  font: 700 11px var(--label);
  letter-spacing: 0.06em;
}

.blade__figure {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 0 18px 12px;
}

.blade__figure b {
  font: 700 clamp(38px, 5vw, 56px)/0.95 var(--display);
  white-space: nowrap;
}

.blade__figure i {
  font: 700 22px var(--label);
  font-style: normal;
  margin-top: 6px;
}

.blade__foot {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  flex-wrap: wrap;
}

.tag {
  font: 700 10px var(--label);
  letter-spacing: 0.08em;
  border: 1px solid var(--ink-dim);
  color: var(--ink-dim);
  padding: 4px 6px;
  border-radius: 2px;
}

.blade__foot em {
  font: 400 12px var(--label);
  font-style: normal;
  color: var(--ink-dim);
}

/* ── sections ─────────────────────────────────────────────────────────────── */

.section {
  padding: clamp(56px, 9vw, 104px) 0;
  border-bottom: 1px solid var(--rule);
}

.section--deep {
  background: var(--bg-deep);
}

.section__head {
  max-width: 62ch;
  margin-bottom: clamp(32px, 5vw, 52px);
}

.section h2 {
  font: 700 clamp(32px, 4.4vw, 50px)/1.05 var(--display);
  margin: 0 0 16px;
  text-wrap: balance;
}

.section__head p {
  color: var(--ink-muted);
  margin: 0;
  font-size: clamp(16px, 1.8vw, 19px);
}

/* ── three pillars ────────────────────────────────────────────────────────── */

.pillars {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: clamp(24px, 3vw, 40px);
}

.pillar {
  border-top: 3px solid var(--accent);
  padding-top: 22px;
}

.pillar h3 {
  font: 700 25px/1.15 var(--display);
  margin: 0 0 10px;
  letter-spacing: 0.01em;
}

.pillar p {
  margin: 0;
  color: var(--ink-muted);
  font-size: 16px;
}

.pillar code {
  font: 400 15px var(--label);
  color: var(--accent);
  background: rgba(245, 197, 24, 0.1);
  padding: 1px 5px;
  border-radius: 2px;
  white-space: nowrap;
}

/* ── feature cards ────────────────────────────────────────────────────────── */

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.feature {
  background: var(--bg);
  padding: clamp(24px, 3vw, 34px);
}

.section--deep .feature {
  background: var(--bg-deep);
}

.feature__label {
  font: 700 11px var(--label);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 14px;
}

.feature h3 {
  font: 600 26px/1.15 var(--display);
  margin: 0 0 12px;
}

.feature p {
  margin: 0;
  color: var(--ink-muted);
  font-size: 15.5px;
  line-height: 1.6;
}

/* ── code report strip ────────────────────────────────────────────────────── */

.report {
  border: 1px solid var(--rule);
  border-radius: 4px;
  overflow: hidden;
  background: var(--surface);
  font-family: var(--label);
  max-width: 560px;
}

.report__head {
  background: var(--surface-alt);
  padding: 12px 18px;
  font: 700 11px var(--label);
  letter-spacing: 0.14em;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.report__row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 14px;
  align-items: baseline;
  padding: 11px 18px;
  border-top: 1px solid var(--rule);
  font-size: 13px;
}

.report__row b {
  font-weight: 400;
  color: var(--ink);
}

.report__row span {
  color: var(--ink-dim);
  font-size: 11px;
  letter-spacing: 0.06em;
}

.report__row .verdict {
  font-weight: 700;
  font-size: 11px;
  letter-spacing: 0.1em;
}

.verdict--pass {
  color: var(--pass);
}
.verdict--fail {
  color: var(--fail);
}
.verdict--warn {
  color: var(--warn);
}

/* ── disclosure / note block ──────────────────────────────────────────────── */

.note {
  border-left: 3px solid var(--warn);
  background: rgba(230, 165, 74, 0.07);
  padding: 20px 24px;
  margin: 32px 0 0;
  font-size: 15.5px;
  color: var(--ink-muted);
}

.note strong {
  color: var(--ink);
}

/* ── legal / prose pages ──────────────────────────────────────────────────── */

.doc {
  padding: clamp(40px, 6vw, 72px) 0 clamp(56px, 8vw, 96px);
}

.doc__head {
  border-bottom: 1px solid var(--rule);
  padding-bottom: 28px;
  margin-bottom: 40px;
}

.doc h1 {
  font: 700 clamp(38px, 6vw, 60px)/1 var(--display);
  margin: 0 0 16px;
}

.doc__dates {
  font: 400 13px var(--label);
  color: var(--ink-dim);
  margin: 0;
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.doc__lede {
  font-size: 19px;
  color: var(--ink-muted);
  margin: 0 0 40px;
}

.doc h2 {
  font: 700 clamp(24px, 3vw, 32px)/1.15 var(--display);
  margin: 48px 0 14px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
}

.doc h2:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.doc h3 {
  font: 600 21px/1.25 var(--display);
  margin: 30px 0 10px;
  color: var(--ink);
  letter-spacing: 0.01em;
}

.doc p,
.doc li {
  color: var(--ink-muted);
}

.doc li {
  margin-bottom: 8px;
}

.doc ul,
.doc ol {
  padding-left: 22px;
}

.doc strong {
  color: var(--ink);
}

.doc table {
  width: 100%;
  border-collapse: collapse;
  margin: 22px 0;
  font-size: 15px;
}

.doc th,
.doc td {
  text-align: left;
  padding: 12px 14px;
  border: 1px solid var(--rule);
  vertical-align: top;
  color: var(--ink-muted);
}

.doc th {
  background: var(--surface);
  color: var(--ink);
  font: 700 11px var(--label);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* A table of rows and columns is unreadable below ~520px. Let it scroll in its
   own box rather than forcing the page body sideways. */
.scroller {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.toc {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 22px 26px;
  margin-bottom: 44px;
}

.toc p {
  font: 700 11px var(--label);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin: 0 0 12px;
}

.toc ol {
  margin: 0;
  padding-left: 20px;
  columns: 2;
  column-gap: 32px;
  font-size: 15px;
}

@media (max-width: 620px) {
  .toc ol {
    columns: 1;
  }
}

.toc li {
  margin-bottom: 6px;
  break-inside: avoid;
}

.toc a {
  text-decoration: none;
}

.toc a:hover {
  text-decoration: underline;
}

/* ── FAQ ──────────────────────────────────────────────────────────────────── */

.faq details {
  border-bottom: 1px solid var(--rule);
  padding: 4px 0;
}

.faq summary {
  cursor: pointer;
  padding: 18px 0;
  font: 600 22px/1.25 var(--display);
  color: var(--ink);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: '+';
  font: 400 26px var(--label);
  color: var(--accent);
  flex: none;
  line-height: 1;
}

.faq details[open] summary::after {
  content: '\2212';
}

.faq summary:hover {
  color: var(--accent);
}

.faq details > *:not(summary) {
  margin: 0 0 18px;
  color: var(--ink-muted);
  max-width: 68ch;
  font-size: 16px;
}

/* ── contact strip ────────────────────────────────────────────────────────── */

.contact {
  display: grid;
  /* 200px, not 240: three of these have to fit the 720px prose column, or the
     third wraps and leaves a bare grid cell showing the gap colour. */
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2px;
  background: var(--rule);
  border: 1px solid var(--rule);
  margin-bottom: 8px;
}

.contact div {
  background: var(--bg);
  padding: 26px;
}

.section--deep .contact div {
  background: var(--bg-deep);
}

.contact p:first-child {
  font: 700 11px var(--label);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 10px;
}

.contact p:last-child {
  margin: 0;
  color: var(--ink-muted);
  font-size: 15.5px;
}

.contact a {
  font-family: var(--label);
  font-size: 15px;
  word-break: break-word;
}

/* ── footer ───────────────────────────────────────────────────────────────── */

.site-foot {
  background: var(--bg-black);
  padding: clamp(40px, 6vw, 64px) 0 40px;
}

.site-foot .tick {
  margin-bottom: 36px;
  opacity: 0.5;
}

.site-foot__grid {
  display: flex;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
  align-items: flex-start;
}

.site-foot__links {
  display: flex;
  gap: clamp(16px, 3vw, 32px);
  flex-wrap: wrap;
  font: 700 12px var(--label);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.site-foot__links a {
  color: var(--ink-muted);
  text-decoration: none;
}

.site-foot__links a:hover {
  color: var(--accent);
}

.site-foot__legal {
  color: var(--ink-dim);
  font-size: 14px;
  max-width: 58ch;
  margin: 28px 0 0;
  line-height: 1.6;
}

.site-foot__legal a {
  color: var(--ink-muted);
}