:root {
  color-scheme: light;
  --ink: #171815;
  --muted: #696b65;
  --line: #d8d8d0;
  --paper: #f3f2eb;
  --panel: #ebeae1;
  --signal: #ff5c35;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--paper);
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(rgba(23, 24, 21, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 24, 21, 0.045) 1px, transparent 1px),
    var(--paper);
  background-size: 32px 32px;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}

.shell {
  width: min(1120px, calc(100% - 40px));
  min-height: 100svh;
  margin: 0 auto;
  padding: 24px 0;
}

.topbar,
footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.topbar {
  padding-bottom: 20px;
  border-bottom: 1px solid var(--ink);
}

.brand {
  color: inherit;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-decoration: none;
  cursor: pointer;
}

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

.brand:active {
  transform: translateY(1px);
}

.status {
  display: inline-flex;
  gap: 9px;
  align-items: center;
  color: var(--muted);
  font-size: 13px;
}

.status i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #2a9d5b;
  box-shadow: 0 0 0 4px rgba(42, 157, 91, 0.13);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(260px, 0.8fr);
  gap: 64px;
  align-items: end;
  padding: clamp(72px, 11vw, 144px) 0 clamp(64px, 9vw, 112px);
}

.eyebrow {
  grid-column: 1 / -1;
  margin: 0 0 -38px;
  color: var(--signal);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.18em;
}

h1 {
  margin: 0;
  font-family: "Songti SC", "STSong", Georgia, serif;
  font-size: clamp(60px, 9.5vw, 128px);
  font-weight: 700;
  letter-spacing: -0.06em;
  line-height: 0.9;
}

.intro {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.75;
}

.roadmap {
  border-top: 1px solid var(--ink);
}

.section-heading {
  display: flex;
  justify-content: space-between;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.section-heading h2,
.section-heading span {
  margin: 0;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.roadmap ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.roadmap li {
  display: grid;
  grid-template-columns: 52px 1fr auto;
  gap: 20px;
  align-items: center;
  min-height: 104px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.roadmap .index,
.tag {
  color: var(--muted);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.roadmap h3 {
  margin: 0 0 6px;
  font-size: 19px;
}

.roadmap p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.done .tag {
  padding: 6px 10px;
  color: #176b3c;
  border: 1px solid rgba(23, 107, 60, 0.25);
  border-radius: 999px;
  background: rgba(42, 157, 91, 0.08);
}

footer {
  padding: 34px 0 12px;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

footer p {
  margin: 0;
}

@media (max-width: 720px) {
  .shell {
    width: min(100% - 28px, 1120px);
    padding-top: 16px;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 72px 0 64px;
  }

  .eyebrow {
    margin-bottom: -6px;
  }

  h1 {
    font-size: clamp(52px, 19vw, 82px);
  }

  .intro {
    max-width: 34rem;
  }

  .roadmap li {
    grid-template-columns: 36px 1fr;
  }

  .tag {
    grid-column: 2;
    justify-self: start;
  }

  footer {
    align-items: flex-start;
    gap: 10px;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
  }
}