/* UDI home site. Plain CSS, no build step. */

@font-face {
  font-family: "Montserrat";
  src: url("../fonts/montserrat-regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Montserrat";
  src: url("../fonts/montserrat-bold.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
/* Metric-matched fallback so text does not jump when Montserrat arrives. */
@font-face {
  font-family: "Montserrat Fallback";
  src: local("Arial"), local("Helvetica Neue"), local("Helvetica");
  size-adjust: 112%;
  ascent-override: 86%;
  descent-override: 22%;
  line-gap-override: 0%;
}

:root {
  color-scheme: light dark;

  --font: "Montserrat", "Montserrat Fallback", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;

  /* Palette from the brand README */
  --green: #0F2B28;
  --gold: #D9A430;
  --mint: #7FC4B8;
  --teal: #1F6F64;
  --dark-gold: #8A5F10;
  --ink: #14211F;
  --offwhite: #EEF3F2;

  /* Light mode surfaces and text */
  --bg: #FFFFFF;
  --bg-alt: #EEF3F2;
  --text: #14211F;
  --muted: #3F5653;
  --link: #1F6F64;
  --num: #1F6F64;
  --focus: #1F6F64;
  --card: #FFFFFF;
  --card-line: #6B8C86;
  --frame: #FFFFFF;
  --frame-line: #6B8C86;
  --header-bg: #FFFFFF;
  --header-line: #D3E0DD;
  --chip-bg: #EEF3F2;

  --max: 1120px;
  --gutter: 16px;
  --radius: 16px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0A1F1D;
    --bg-alt: #133430;
    --text: #EEF3F2;
    --muted: #B9CECA;
    --link: #7FC4B8;
    --num: #D9A430;
    --focus: #7FC4B8;
    --card: #0F2B28;
    --card-line: #4F8A80;
    --frame: #FFFFFF;
    --frame-line: #7FC4B8;
    --header-bg: #0F2B28;
    --header-line: #2A524C;
    --chip-bg: #1B433E;
  }
}

/* Surfaces that stay deep green in both modes */
.on-green {
  --bg: #0F2B28;
  --text: #EEF3F2;
  --muted: #C4D7D3;
  --link: #7FC4B8;
  --focus: #7FC4B8;
  background: var(--bg);
  color: var(--text);
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 1.125rem;
  line-height: 1.6;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; }

h1, h2, h3 {
  font-weight: 700;
  line-height: 1.2;
  margin: 0;
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(1.75rem, 1rem + 4vw, 3.5rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.625rem, 1.2rem + 2vw, 2.5rem); overflow-wrap: normal; hyphens: manual; }
h3 { font-size: 1.25rem; overflow-wrap: normal; hyphens: manual; }
p { margin: 0 0 1em; }

a { color: var(--link); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }

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

.wrap {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* Skip link */
.skip-link {
  position: absolute;
  left: 8px;
  top: 8px;
  z-index: 10;
  padding: 12px 16px;
  min-height: 44px;
  background: var(--gold);
  color: var(--ink);
  font-weight: 700;
  border-radius: 8px;
  transform: translateY(-200%);
}
.skip-link:focus { transform: none; outline: 3px solid var(--ink); outline-offset: 2px; }
@media (prefers-color-scheme: dark) {
  .skip-link:focus { outline-color: #FFFFFF; }
}

/* Header (static, not sticky) */
.site-header {
  background: var(--header-bg);
  border-bottom: 1px solid var(--header-line);
}
.header-row {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 72px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  color: var(--text);
  text-decoration: none;
  margin-right: auto;
}
.brand img { display: block; }
.brand-name { font-weight: 700; font-size: 1.25rem; letter-spacing: 0.02em; }
.header-nav { display: none; gap: 8px; }
.header-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 12px;
  color: var(--text);
  text-decoration: none;
  font-size: 1rem;
}
.header-nav a:hover { text-decoration: underline; text-underline-offset: 6px; }

/* Buttons and links */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  border: 2px solid transparent;
  border-radius: 12px;
  font-family: inherit;
  font-weight: 700;
  font-size: 1rem;
  text-decoration: none;
  transition: background-color 0.15s ease, color 0.15s ease;
}
.btn-primary { background: var(--gold); color: var(--ink); }
.btn-primary:hover { background: #E6B544; text-decoration: none; }
.btn-quiet {
  min-height: 44px;
  padding: 0 18px;
  border-color: currentColor;
  color: var(--text);
}
.btn-quiet:hover { background: var(--chip-bg); }
.text-link {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  font-weight: 700;
  color: var(--text);
  text-underline-offset: 6px;
  text-decoration-thickness: 2px;
  text-decoration-color: var(--gold);
}
.text-link:hover { text-decoration-color: var(--mint); }

/* Hero */
.hero {
  position: relative;
  overflow: hidden;
  padding-block: 48px 64px;
}
.hero::before {
  content: "";
  position: absolute;
  right: -300px;
  top: 60%;
  width: 720px;
  height: 720px;
  transform: translateY(-50%);
  background: url("../img/star-motif.svg") center / contain no-repeat;
  pointer-events: none;
}
.hero-grid { position: relative; display: grid; gap: 28px; }
.hero-logo img { display: block; width: 240px; height: auto; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 20px;
  padding: 6px 14px;
  min-height: 32px;
  border: 1px solid var(--mint);
  border-radius: 999px;
  color: var(--mint);
  font-size: 0.875rem;
  font-weight: 700;
  line-height: 1.2;
}
.chip-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--gold); flex: none; }
.lede {
  max-width: 34ch;
  margin: 20px 0 28px;
  font-size: 1.1875rem;
  color: var(--text);
}
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 24px; }
.hero-actions .btn-primary { width: 100%; }

/* Sections */
.section { padding-block: 56px; }
.s-a { background: var(--bg); }
.s-b { background: var(--bg-alt); }
.section h2 { margin-bottom: 20px; }
.lead { max-width: 60ch; margin-bottom: 32px; font-size: 1.125rem; color: var(--muted); }
.big { max-width: 56ch; margin: 0; font-size: 1.25rem; line-height: 1.6; }

/* Gaps */
.gaps, .stats, .chips, .footer-links { list-style: none; margin: 0; padding: 0; }
.gaps { display: grid; gap: 28px; margin-bottom: 48px; }
.gaps h3 { margin-bottom: 8px; color: var(--text); }
.gaps p { margin: 0; color: var(--muted); }
.gaps li { padding-left: 20px; border-left: 4px solid var(--gold); }

/* Figures (numerals): open, unboxed, unlike the cards */
.stats-title { margin-bottom: 20px; }
.stats { display: grid; gap: 28px; margin-bottom: 56px; }
.stat-tag { margin: 0; font-size: 0.875rem; font-weight: 700; color: var(--muted); }
.stat-num { margin: 0; font-size: clamp(3rem, 2rem + 5vw, 4.5rem); font-weight: 700; line-height: 1.05; color: var(--num); letter-spacing: -0.03em; }
.stat-cap { margin: 4px 0 0; max-width: 24ch; }
.src-link { display: inline-flex; align-items: center; min-height: 44px; font-size: 1rem; }

/* Diagrams */
.diagram { margin-top: 48px; }
.diagram:first-of-type { margin-top: 0; }
.diagram h3 { margin-bottom: 8px; }
.caption { max-width: 62ch; margin-bottom: 20px; color: var(--muted); }
.frame {
  overflow-x: auto;
  padding: 12px;
  background: var(--frame);
  border: 1px solid var(--frame-line);
  border-radius: var(--radius);
  -webkit-overflow-scrolling: touch;
}
.frame img { display: block; width: 100%; min-width: 860px; max-width: none; height: auto; }
.hint { margin: 8px 0 0; font-size: 0.875rem; color: var(--muted); }
.diagram details { margin-top: 12px; }
.diagram summary {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  cursor: pointer;
  font-weight: 700;
  color: var(--link);
  list-style: none;
}
.diagram summary::-webkit-details-marker { display: none; }
.diagram summary::before {
  content: "";
  flex: none;
  width: 0;
  height: 0;
  border-left: 7px solid currentColor;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
}
.diagram details[open] summary::before {
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 7px solid currentColor;
  border-bottom: 0;
}
.diagram details > p { max-width: 62ch; color: var(--muted); }
.textalt { max-width: 62ch; margin: 0 0 8px; padding-left: 1.5em; }
.textalt li { margin-bottom: 8px; }
.open-full { margin: 0; }
.open-full a { display: inline-flex; align-items: center; min-height: 44px; font-weight: 700; }

/* Coming-soon cards */
.cards { display: grid; gap: 24px; align-items: start; }
.card {
  padding: 24px 20px;
  background: var(--card);
  border: 2px dashed var(--card-line);
  border-radius: var(--radius);
}
.card-head { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; margin-bottom: 16px; }
.card-head h3 { font-size: 1.5rem; }
.badge {
  display: inline-block;
  padding: 4px 12px;
  background: var(--gold);
  color: var(--ink);
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 700;
  line-height: 1.4;
}
.card p { color: var(--text); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.chips li {
  padding: 6px 14px;
  background: var(--chip-bg);
  border-radius: 999px;
  font-size: 1rem;
  font-weight: 700;
}
.members { margin: 0 0 16px; }
.members > div { padding: 14px 0; border-top: 1px solid var(--card-line); }
.members > div:first-child { border-top: 0; padding-top: 0; }
.members dt { margin-bottom: 4px; font-weight: 700; }
.members dd { margin: 0; color: var(--muted); font-size: 1rem; }
.members strong { color: var(--text); }
.card-link { margin: 0; }
.card-link a { display: inline-flex; align-items: center; min-height: 44px; font-weight: 700; }

/* Closing band */
.band { padding-block: 64px; }
.band h2 { margin-bottom: 16px; }
.band .lead { color: var(--muted); margin-bottom: 28px; }

/* Footer */
.site-footer { padding-block: 48px 40px; border-top: 1px solid #2A524C; }
.footer-grid { display: grid; gap: 28px; }
.site-footer img { display: block; width: 220px; height: auto; }
.footer-links { display: flex; flex-wrap: wrap; gap: 4px 24px; margin-bottom: 12px; }
.footer-links a { display: inline-flex; align-items: center; min-height: 44px; font-weight: 700; }
.fine { max-width: 56ch; margin: 0; font-size: 1rem; color: var(--muted); }
.fine strong { color: var(--text); }

/* 720px and up */
@media (min-width: 720px) {
  :root { --gutter: 32px; }
  .header-nav { display: flex; }
  .hero { padding-block: 72px 88px; }
  .hero-actions .btn-primary { width: auto; }
  .section { padding-block: 80px; }
  .stats { grid-template-columns: repeat(3, 1fr); gap: 24px; }
  .frame { padding: 20px; }
  .frame img { min-width: 0; }
  .hint { display: none; }
  .card { padding: 32px; }
  .members > div { display: grid; grid-template-columns: 11rem 1fr; gap: 16px; }
  .members dt { margin: 0; }
  .band { padding-block: 80px; }
  .footer-grid { grid-template-columns: auto 1fr; align-items: center; gap: 56px; }
}

/* 1040px and up */
@media (min-width: 1040px) {
  .hero-grid { grid-template-columns: 1.3fr 1fr; align-items: center; gap: 48px; }
  .hero-logo { grid-column: 2; grid-row: 1; justify-self: center; }
  .hero-logo img { width: 360px; }
  .hero-text { grid-column: 1; grid-row: 1; }
  .gaps { grid-template-columns: repeat(3, 1fr); gap: 32px; }
  .stats { gap: 40px; }
  .cards { grid-template-columns: 1fr 1fr; gap: 32px; }
  .members > div { display: block; }
  .members dt { margin-bottom: 4px; }
}

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