/* Iron Arachne landing page.
 *
 * Every colour resolves to a token in assets/brand/colors.css, which is vendored from the
 * brand repo. No hex is restated here — a colour this page needs and the brand repo lacks
 * goes in the brand repo first. See docs/landing-page.md.
 */

/* Only the roman is declared. The page sets no display text (the wordmark is outlined inside
 * the lockup SVG) and no italics, so Cinzel Decorative and the italic file are vendored but
 * deliberately not referenced — 46KB of font instead of 127KB. GUIDELINES.md forbids
 * synthesising either, so adding italic or display copy means shipping the file, not faking it. */
@font-face {
  font-family: 'Inclusive Sans';
  src: url('assets/fonts/InclusiveSans-Variable.woff2') format('woff2-variations');
  font-weight: 300 700;
  font-style: normal;
  font-display: swap;
}

:root {
  /* Charcoal is the ground everywhere — this page has no light mode by brand decision,
   * so these are deliberately not wrapped in a prefers-color-scheme query. */
  --page-bg: var(--ia-charcoal);
  --page-ink: color-mix(in srgb, var(--ia-charcoal) 5%, white 95%);
  --page-accent: var(--ia-green);

  --measure: 34rem;
  --gutter: 1.5rem;
}

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

html {
  /* Belt and braces: the body is centred in the viewport, and an overscroll bounce
   * on a phone would otherwise expose the browser's own white behind it. */
  background: var(--page-bg);
}

body {
  margin: 0;
  padding: clamp(2rem, 8vw, 5rem) var(--gutter);
  background: var(--page-bg);
  color: var(--page-ink);
  font-family: 'Inclusive Sans', system-ui, Helvetica, sans-serif;
  font-weight: 400;
  font-size: clamp(1rem, 0.95rem + 0.3vw, 1.125rem);
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: var(--measure);
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(2.5rem, 7vw, 4rem);
}

/* Clear space is half the glyph height on all four sides. The gap above plus the
 * lockup's own padding keeps well clear of that at every width. */
.hero {
  width: 100%;
  display: flex;
  justify-content: center;
}

.lockup {
  display: block;
  height: auto;

  /* Both lockups have a documented minimum width below which the artwork stops resolving:
   * 200px horizontal, 140px stacked. The stacked mark carries the narrow end because it
   * clears its floor with far more room — at a 320px viewport it renders about 230px wide
   * against a 140px floor, where the horizontal lockup would sit almost exactly on its own. */
  width: min(72vw, 260px);
}

@media (min-width: 480px) {
  .lockup {
    width: min(70vw, 460px);
  }
}

.intro {
  width: 100%;
}

.intro p {
  margin: 0 0 1.25rem;
}

.intro p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--page-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  text-decoration-thickness: 2px;
}

/* The green is the brightest thing on the page, and the primary action is where it belongs.
 * Green on charcoal measures 10.65:1, and charcoal on green the same, so both directions pass AA. */
.button {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  border-radius: 0.25rem;
  background: var(--page-accent);
  color: var(--ia-charcoal);
  font-weight: 600;
  text-decoration: none;
}

.button:hover {
  background: var(--ia-green-acid);
}

a:focus-visible,
.button:focus-visible {
  outline: 2px solid var(--page-accent);
  outline-offset: 3px;
}

.button:focus-visible {
  /* The button is already green, so a green ring on it would be invisible. */
  outline-color: var(--page-ink);
}

@media (prefers-reduced-motion: no-preference) {
  a,
  .button {
    transition:
      background-color 120ms ease,
      text-decoration-thickness 120ms ease;
  }
}