:root {
  --paper: #f4efe7;
  --sheet: #fffaf0;
  --ink: #1f2923;
  --muted: #5d685f;
  --moss: #587060;
  --vermilion: #c6533f;
  --sand: #d9cdb9;
  --line: rgba(31, 41, 35, 0.14);
  --shadow: 0 28px 80px rgba(31, 41, 35, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 8%, rgba(198, 83, 63, 0.08), transparent 27rem),
    repeating-linear-gradient(0deg, rgba(31, 41, 35, 0.018) 0 1px, transparent 1px 5px),
    var(--paper);
  font-family: "Avenir Next", "Gill Sans", "PingFang SC", "Hiragino Sans GB", sans-serif;
  line-height: 1.7;
}

a {
  color: inherit;
}

.shell {
  width: min(1080px, calc(100% - 36px));
  margin-inline: auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(18px);
}

.nav {
  display: flex;
  min-height: 68px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
}

.brand img {
  width: 38px;
  height: 38px;
  border-radius: 9px;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 18px;
  font-size: 14px;
  font-weight: 700;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
}

.nav-links a[aria-current="page"],
.nav-links a:hover {
  color: var(--vermilion);
}

.hero {
  padding: 92px 0 58px;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 18px;
  color: var(--vermilion);
  font-size: 13px;
  font-weight: 850;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 38px;
  height: 4px;
  border-radius: 99px;
  background: var(--vermilion);
  content: "";
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2 {
  font-family: "Iowan Old Style", "Baskerville", "Songti SC", serif;
}

h1 {
  max-width: 820px;
  margin-bottom: 22px;
  font-size: clamp(48px, 9vw, 102px);
  font-weight: 800;
  letter-spacing: -0.045em;
  line-height: 0.94;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(30px, 5vw, 50px);
  line-height: 1.05;
}

h3 {
  margin-bottom: 8px;
  font-size: 19px;
}

.lead {
  max-width: 760px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: clamp(18px, 2.4vw, 23px);
}

.meta-line {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-top: 28px;
  color: var(--muted);
  font-size: 14px;
}

.meta-line strong {
  color: var(--ink);
}

.band {
  padding: 28px 0 86px;
}

.grid {
  display: grid;
  grid-template-columns: minmax(0, 0.72fr) minmax(270px, 0.28fr);
  gap: 22px;
  align-items: start;
}

.stack {
  display: grid;
  gap: 18px;
}

.card {
  border: 1px solid var(--line);
  border-radius: 22px;
  background: color-mix(in srgb, var(--sheet) 94%, transparent);
  box-shadow: var(--shadow);
  padding: clamp(24px, 4vw, 38px);
}

.card p:last-child,
.card ul:last-child {
  margin-bottom: 0;
}

.card p,
.card li {
  color: var(--muted);
}

.card strong {
  color: var(--ink);
}

.section-number {
  display: inline-grid;
  width: 34px;
  height: 34px;
  margin-bottom: 22px;
  place-items: center;
  border: 1px solid color-mix(in srgb, var(--vermilion) 40%, transparent);
  border-radius: 50%;
  color: var(--vermilion);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 12px;
  font-weight: 800;
}

.fact-list {
  display: grid;
  gap: 15px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.fact-list li {
  border-top: 1px solid var(--line);
  padding-top: 15px;
}

.stamp {
  width: fit-content;
  margin-top: 20px;
  border: 2px solid var(--vermilion);
  border-radius: 999px;
  color: var(--vermilion);
  padding: 8px 14px;
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transform: rotate(-2deg);
}

.action {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  margin-top: 10px;
  border-radius: 12px;
  background: var(--vermilion);
  color: #fff;
  padding: 12px 18px;
  font-weight: 800;
  text-decoration: none;
}

.action:hover {
  filter: brightness(0.93);
}

.note {
  border-left: 4px solid var(--moss);
  background: rgba(88, 112, 96, 0.08);
  padding: 16px 18px;
  color: var(--muted);
}

.zh {
  margin-top: 34px;
  border-top: 1px dashed var(--sand);
  padding-top: 26px;
}

.zh-label {
  color: var(--vermilion);
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

footer {
  border-top: 1px solid var(--line);
  padding: 28px 0 44px;
  color: var(--muted);
  font-size: 14px;
}

footer .shell {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 22px;
}

@media (max-width: 760px) {
  .hero {
    padding-top: 68px;
  }

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

  .nav {
    align-items: flex-start;
    padding: 14px 0;
  }

  .nav-links {
    gap: 9px 14px;
  }
}

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