:root {
  --ink: #18201e;
  --forest: #173b36;
  --forest-soft: #47655f;
  --paper: #f7f8f5;
  --line: #d8dfda;
  --signal: #ca6a49;
  --muted: #697570;
  --display: "Songti SC", "STSong", "Noto Serif CJK SC", serif;
  --body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--body);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

.site-header,
main,
footer {
  width: min(1080px, calc(100% - 48px));
  margin-inline: auto;
}

.site-header {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--forest);
  font-size: 19px;
  font-weight: 750;
  letter-spacing: -0.03em;
  text-decoration: none;
}

.brand-mark {
  width: 24px;
  height: 24px;
  display: inline-flex;
  align-items: flex-end;
  justify-content: center;
  gap: 2px;
  padding: 5px;
  border-radius: 50%;
  background: var(--forest);
}

.brand-mark i {
  width: 3px;
  display: block;
  border-radius: 2px;
  background: var(--paper);
}

.brand-mark i:nth-child(1) { height: 6px; }
.brand-mark i:nth-child(2) { height: 12px; }
.brand-mark i:nth-child(3) { height: 9px; }

.pilot-badge {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.12em;
}

.hero {
  min-height: 680px;
  padding: clamp(80px, 12vh, 128px) 0 56px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.eyebrow {
  margin: 0 0 20px;
  color: var(--forest-soft);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.22em;
}

h1,
h2,
p {
  text-wrap: pretty;
}

h1,
h2 {
  font-family: var(--display);
  font-weight: 700;
  letter-spacing: -0.04em;
}

h1 {
  max-width: 820px;
  margin: 0;
  font-size: clamp(54px, 7.4vw, 94px);
  line-height: 1.08;
}

.hero-copy {
  max-width: 570px;
  margin: 30px 0 70px;
  color: var(--muted);
  font-size: clamp(16px, 1.8vw, 19px);
}

.evidence-path {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border-top: 1px solid var(--line);
}

.evidence-path div {
  min-width: 0;
  position: relative;
  padding: 20px 0 0;
}

.evidence-path div:not(:last-child)::after {
  content: "";
  width: 5px;
  height: 5px;
  position: absolute;
  top: -3px;
  right: 26px;
  border-radius: 50%;
  background: var(--signal);
}

.evidence-path span,
.evidence-path strong {
  display: block;
}

.evidence-path span {
  margin-bottom: 8px;
  color: var(--signal);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.evidence-path strong {
  color: var(--forest);
  font-size: 16px;
}

.status {
  margin: 0;
  padding: clamp(64px, 9vw, 104px) 0;
  display: grid;
  grid-template-columns: 130px minmax(0, 1fr) 280px;
  gap: 42px;
  align-items: start;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.status .eyebrow {
  margin-top: 8px;
}

.status h2 {
  max-width: 600px;
  margin: 0;
  color: var(--forest);
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.2;
}

.status > p:last-child {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 14px;
}

footer {
  padding: 42px 0 56px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
}

footer strong {
  color: var(--forest);
  font-size: 17px;
}

footer p,
.footer-meta {
  color: var(--muted);
  font-size: 12px;
}

footer p {
  margin: 3px 0 0;
}

.footer-meta {
  display: flex;
  gap: 20px;
}

.brand:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--signal) 60%, transparent);
  outline-offset: 6px;
}

@media (max-width: 760px) {
  .site-header,
  main,
  footer {
    width: min(100% - 32px, 1080px);
  }

  .site-header {
    min-height: 68px;
  }

  .hero {
    min-height: auto;
    padding: 72px 0 40px;
  }

  h1 {
    font-size: clamp(46px, 14vw, 66px);
  }

  .hero-copy {
    margin: 26px 0 54px;
  }

  .evidence-path {
    grid-template-columns: 1fr;
  }

  .evidence-path div {
    display: grid;
    grid-template-columns: 42px 1fr;
    align-items: center;
    padding: 14px 0;
    border-bottom: 1px solid var(--line);
  }

  .evidence-path div::after {
    display: none;
  }

  .evidence-path span {
    margin: 0;
  }

  .status {
    padding: 58px 0;
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .status .eyebrow,
  .status > p:last-child {
    margin-top: 0;
  }

  footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .footer-meta {
    gap: 6px;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}