/**
 * Landing-page styles.
 *
 * Deliberately one small external stylesheet rather than inline CSS per page:
 * six generated pages sharing one cached file beats six copies of the same
 * bytes, and Core Web Vitals are a ranking signal.
 *
 * Readability is the whole job here — these pages exist to be read and to rank,
 * so the measure is capped, the type scale is generous and contrast clears
 * WCAG AA in both themes.
 */

:root {
  color-scheme: dark;
  --bg: #071116;
  --panel: rgba(255, 255, 255, 0.06);
  --ink: #f5fbff;
  --muted: #b3c2cd;
  --line: rgba(255, 255, 255, 0.16);
  --teal: #24d1c3;
  --blue: #57a6ff;
  --amber: #f6b64b;
  --coral: #f36d5d;
  --space: 8px;
}

@media (prefers-color-scheme: light) {
  :root {
    color-scheme: light;
    --bg: #f6f3ea;
    --panel: rgba(255, 255, 255, 0.8);
    --ink: #101820;
    --muted: #46535f;
    --line: rgba(17, 24, 39, 0.16);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  top: var(--space);
  left: var(--space);
  z-index: 10;
  transform: translateY(-200%);
  background: var(--teal);
  color: #041113;
  border-radius: var(--space);
  padding: 10px 14px;
  font-weight: 800;
}

.skip-link:focus {
  transform: translateY(0);
}

/* Visible focus everywhere — keyboard users must never lose their place. */
a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--teal);
  outline-offset: 3px;
}

.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: calc(var(--space) * 2);
  flex-wrap: wrap;
  border-bottom: 1px solid var(--line);
  padding: calc(var(--space) * 2) calc(var(--space) * 3);
}

.bar.foot {
  border-bottom: 0;
  border-top: 1px solid var(--line);
  margin-top: calc(var(--space) * 8);
  color: var(--muted);
  font-size: 0.9rem;
}

.brand {
  font-weight: 900;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.bar nav {
  display: flex;
  gap: calc(var(--space) * 2);
  font-size: 0.92rem;
  font-weight: 700;
}

main {
  max-width: 74ch;
  margin: 0 auto;
  padding: calc(var(--space) * 4) calc(var(--space) * 3) calc(var(--space) * 6);
}

.crumbs ol {
  display: flex;
  gap: var(--space);
  list-style: none;
  margin: 0 0 calc(var(--space) * 3);
  padding: 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.crumbs li + li::before {
  content: "/";
  margin-right: var(--space);
  opacity: 0.6;
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 0 0 calc(var(--space) * 2);
}

h2 {
  font-size: clamp(1.3rem, 3vw, 1.7rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: calc(var(--space) * 6) 0 calc(var(--space) * 2);
}

h3 {
  font-size: 1.02rem;
  margin: 0;
  display: inline;
}

p {
  margin: 0 0 calc(var(--space) * 2);
}

.standfirst {
  font-size: 1.2rem;
  color: var(--muted);
  margin-bottom: calc(var(--space) * 4);
}

/* Language switcher. Present only where a translation exists, so it never
   promises a language the reader would land on in English. */
.langs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space);
  margin: 0 0 calc(var(--space) * 4);
  font-size: 0.88rem;
  font-weight: 700;
}

.langs a,
.langs span {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 14px;
  text-decoration: none;
}

.langs span[aria-current] {
  border-color: var(--teal);
  color: var(--teal);
}

.langs a:hover {
  border-color: var(--teal);
}

/* ---- The live test ------------------------------------------------------ */
.tool {
  border: 1px solid var(--line);
  border-radius: calc(var(--space) * 1.5);
  background: radial-gradient(120% 120% at 50% 0%, #10151c, #05070a 70%);
  padding: calc(var(--space) * 3);
  margin: 0 0 calc(var(--space) * 5);
  color: #f5fbff;
}

.stage {
  display: grid;
  place-items: center;
  gap: calc(var(--space) * 2);
  min-height: 200px;
}

.go {
  width: 150px;
  height: 150px;
  border: 2px solid var(--blue);
  border-radius: 50%;
  background: #05070a;
  color: #fff;
  font: inherit;
  font-size: 2rem;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: transform 0.2s ease;
}

.go.small {
  width: 96px;
  height: 96px;
  font-size: 1.1rem;
}

.go:hover {
  transform: scale(1.04);
}

.go[hidden],
.caption[hidden],
.readout[hidden],
.results[hidden] {
  display: none;
}

.caption {
  color: #9aa3b4;
  font-size: 0.88rem;
  margin: 0;
}

.readout {
  width: 100%;
  text-align: center;
}

.phase {
  color: var(--teal);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  margin: 0;
}

.value {
  font-size: clamp(2.4rem, 8vw, 3.4rem);
  font-weight: 800;
  line-height: 1.1;
  margin: var(--space) 0;
  font-variant-numeric: tabular-nums;
}

.value .unit {
  font-size: 1rem;
  color: #9aa3b4;
}

.track {
  height: 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
  overflow: hidden;
}

.track span {
  display: block;
  height: 100%;
  width: 0;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--blue), var(--teal));
  transition: width 0.15s linear;
}

.results {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: calc(var(--space) * 1.5);
  margin: calc(var(--space) * 3) 0 0;
}

.results div {
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--space);
  padding: calc(var(--space) * 1.5);
}

.results dt {
  color: #9aa3b4;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.results dd {
  margin: 6px 0 0;
  font-size: 1.35rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.results dd span {
  margin-left: 5px;
  font-size: 0.7rem;
  font-weight: 700;
  color: #9aa3b4;
}

.status {
  color: #b9c3cf;
  font-size: 0.9rem;
  margin: calc(var(--space) * 2) 0 0;
}

.lead-metric {
  display: none;
}

/* ---- FAQ, links --------------------------------------------------------- */
.faq details {
  border-bottom: 1px solid var(--line);
  padding: calc(var(--space) * 2) 0;
}

.faq summary {
  cursor: pointer;
  font-weight: 700;
  list-style: none;
}

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

.faq summary::after {
  content: "+";
  float: right;
  color: var(--muted);
}

.faq details[open] summary::after {
  content: "–";
}

.faq p {
  margin: var(--space) 0 0;
  color: var(--muted);
}

.related {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: calc(var(--space) * 1.5);
}

.related a {
  display: block;
  border: 1px solid var(--line);
  border-radius: var(--space);
  padding: calc(var(--space) * 2);
  text-decoration: none;
  background: var(--panel);
}

.related a:hover {
  border-color: var(--teal);
}

.related strong {
  display: block;
}

.related span {
  color: var(--muted);
  font-size: 0.9rem;
}

.cta {
  margin-top: calc(var(--space) * 5);
  font-weight: 800;
}

.cta a {
  color: var(--teal);
}

@media (prefers-reduced-motion: reduce) {
  .go,
  .track span {
    transition: none;
  }
}