:root {
  color-scheme: dark;
  --ink: #f3f0e8;
  --muted: #a8a79f;
  --line: rgba(243, 240, 232, 0.16);
  --acid: #c8ff55;
  --paper: #10110f;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 77% 25%, rgba(200, 255, 85, 0.12), transparent 24rem),
    var(--paper);
  color: var(--ink);
  font-family: Inter, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  opacity: 0.12;
  background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(to bottom, black, transparent 82%);
}

a {
  color: inherit;
}

.shell {
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 88px;
  border-bottom: 1px solid var(--line);
}

.brand {
  font-size: 0.92rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-decoration: none;
}

.status {
  display: inline-flex;
  gap: 9px;
  align-items: center;
  color: var(--muted);
  font-size: 0.82rem;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--acid);
  box-shadow: 0 0 18px rgba(200, 255, 85, 0.7);
}

.hero {
  min-height: min(730px, calc(100vh - 88px));
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding: 80px 0 96px;
}

.eyebrow,
.section-number {
  margin: 0 0 28px;
  color: var(--acid);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.18em;
}

h1 {
  max-width: 930px;
  margin: 0;
  font-family: Georgia, "Noto Serif SC", serif;
  font-size: clamp(3.6rem, 9.6vw, 8.4rem);
  font-weight: 400;
  line-height: 0.95;
  letter-spacing: -0.055em;
}

h1 em {
  color: var(--acid);
  font-weight: 400;
}

.intro {
  max-width: 570px;
  margin: 42px 0 34px;
  color: var(--muted);
  font-size: clamp(1rem, 1.8vw, 1.2rem);
  line-height: 1.85;
}

.action {
  display: inline-flex;
  gap: 52px;
  align-items: center;
  padding: 15px 18px 15px 20px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.9rem;
  text-decoration: none;
  transition: color 180ms ease, background-color 180ms ease, border-color 180ms ease;
}

.action:hover,
.action:focus-visible {
  border-color: var(--acid);
  background: var(--acid);
  color: var(--paper);
  outline: none;
}

.next {
  display: grid;
  grid-template-columns: minmax(90px, 0.35fr) 1fr;
  gap: 36px;
  padding: 96px 0 112px;
  border-top: 1px solid var(--line);
}

.next h2 {
  margin: 0 0 24px;
  font-family: Georgia, "Noto Serif SC", serif;
  font-size: clamp(2rem, 4.5vw, 4rem);
  font-weight: 400;
  letter-spacing: -0.035em;
}

.next p:not(.section-number) {
  max-width: 640px;
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.85;
}

footer {
  display: flex;
  justify-content: space-between;
  padding: 28px 0 36px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
}

@media (max-width: 680px) {
  .shell {
    width: min(100% - 32px, 1180px);
  }

  .topbar {
    min-height: 72px;
  }

  .hero {
    min-height: calc(100svh - 72px);
    padding: 56px 0 72px;
  }

  h1 {
    font-size: clamp(3.15rem, 17vw, 5.4rem);
  }

  .intro {
    margin-top: 30px;
  }

  .next {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 72px 0 80px;
  }

  footer {
    flex-direction: column;
    gap: 8px;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}