:root {
  --paper: #f3ecdf;
  --silk: #fbf8f2;
  --ink: #2c241b;
  --muted: #6f6256;
  --ochre: #8c6244;
  --line: #e4d3bc;
  --cinnabar: #9d3b32;
  --seal: #7c2f2a;
  --shadow: 0 16px 40px rgba(44, 36, 27, 0.06);
  --max: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(157, 59, 50, 0.06), transparent 32%),
    var(--paper);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

img { max-width: 100%; display: block; }

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

a:hover { color: var(--cinnabar); }

.skip {
  position: absolute;
  left: 16px;
  top: -40px;
  padding: 8px 12px;
  background: var(--seal);
  color: #fff;
  z-index: 10;
}

.skip:focus { top: 12px; }

.wrap {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  background: rgba(243, 236, 223, 0.92);
  border-bottom: 1px solid rgba(228, 211, 188, 0.9);
  backdrop-filter: blur(10px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.brand img {
  width: 36px;
  height: 36px;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}

.nav a {
  color: var(--ink);
  text-decoration: none;
  font-size: 15px;
}

.nav a:hover { color: var(--cinnabar); }

.hero {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: center;
  padding: 56px 0 28px;
}

.kicker {
  margin: 0 0 10px;
  color: var(--cinnabar);
  letter-spacing: 0.42em;
  font-size: 14px;
}

h1, h2, h3 {
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-weight: 700;
  line-height: 1.25;
}

h1 {
  margin: 0;
  font-size: 56px;
  letter-spacing: 0.08em;
}

.lead {
  margin: 18px 0 0;
  max-width: 38em;
  color: var(--muted);
  font-size: 17px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid var(--seal);
  background: var(--seal);
  color: #fff;
  text-decoration: none;
}

.btn.ghost {
  background: transparent;
  color: var(--seal);
}

.btn:hover { color: #fff; background: var(--cinnabar); border-color: var(--cinnabar); }

.btn.ghost:hover { color: var(--cinnabar); background: transparent; }

.hero-card {
  background: var(--silk);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  padding: 28px 24px;
  text-align: center;
}

.hero-card img {
  width: min(280px, 100%);
  height: auto;
  margin: 0 auto 14px;
}

.hero-card p {
  margin: 0;
  color: var(--ochre);
  letter-spacing: 0.08em;
  font-size: 15px;
}

.section { padding: 28px 0 12px; }

.section h2 {
  margin: 0 0 8px;
  font-size: 32px;
  letter-spacing: 0.06em;
}

.section-note {
  margin: 0 0 22px;
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.card {
  background: var(--silk);
  border: 1px solid var(--line);
  padding: 22px 20px 18px;
}

.card h3 {
  margin: 0 0 8px;
  font-size: 22px;
}

.card p { margin: 0; color: var(--muted); }

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.steps li {
  background: var(--silk);
  border: 1px solid var(--line);
  padding: 20px;
}

.steps strong {
  display: block;
  margin-bottom: 6px;
  color: var(--cinnabar);
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-size: 18px;
}

.faq { display: grid; gap: 12px; }

.faq details {
  background: var(--silk);
  border: 1px solid var(--line);
  padding: 14px 18px;
}

.faq summary {
  cursor: pointer;
  font-weight: 700;
}

.faq p { margin: 10px 0 0; color: var(--muted); }

.site-footer {
  margin-top: 36px;
  border-top: 1px solid var(--line);
  padding: 22px 0 32px;
  color: var(--muted);
  font-size: 14px;
}

.site-footer p { margin: 0; }

@media (max-width: 860px) {
  .hero, .grid, .steps { grid-template-columns: 1fr; }
  h1 { font-size: 40px; }
  .hero { padding-top: 32px; gap: 24px; }
  .header-inner { align-items: flex-start; flex-direction: column; padding: 12px 0; }
  .hero-card img { width: min(240px, 100%); }
}

@media (max-width: 420px) {
  .wrap { width: min(var(--max), calc(100% - 24px)); }
  h1 { font-size: 34px; }
  .section h2 { font-size: 28px; }
}