:root {
  --paper: #f4ead8;
  --paper-2: #efe0c4;
  --cream: #fff8ea;
  --ink: #3a2a1a;
  --muted: #7a6248;
  --wood: #6b3e26;
  --cinnabar: #8b1e1e;
  --line: #c9b48a;
  --max: 1080px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(ellipse at 12% 0%, rgba(255, 248, 230, 0.7), transparent 42%),
    linear-gradient(180deg, var(--paper), var(--paper-2));
  font-family: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  line-height: 1.75;
}

a { color: var(--cinnabar); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { width: min(var(--max), calc(100% - 48px)); margin: 0 auto; }

.site-head {
  position: sticky;
  top: 0;
  z-index: 8;
  background: rgba(244, 234, 216, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-head .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px 0;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  text-decoration: none;
  font-size: 20px;
  letter-spacing: 0.08em;
}
.brand img { width: 40px; height: 40px; display: block; }
.nav { display: flex; flex-wrap: wrap; gap: 8px 22px; font-size: 15px; }
.nav a { color: var(--wood); text-decoration: none; }
.nav a:hover { color: var(--cinnabar); }

.hero {
  padding: 72px 0 56px;
  text-align: center;
}
.hero img {
  width: 112px;
  height: 112px;
  margin: 0 auto 20px;
  display: block;
}
.hero h1 {
  margin: 0 auto 8px;
  font-size: clamp(36px, 6vw, 56px);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-align: center;
}
.hero .lead {
  margin: 0 auto 12px;
  max-width: none;
  font-size: 20px;
  color: var(--cinnabar);
  letter-spacing: 0.18em;
  padding-left: 0.18em;
  text-align: center;
}
.hero p {
  max-width: 36em;
  margin: 0 auto;
  color: var(--muted);
  font-size: 16px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px 16px;
  margin-top: 28px;
}

.btn-seal,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 148px;
  padding: 12px 28px;
  border: 1px solid var(--cinnabar);
  font: inherit;
  font-size: 16px;
  letter-spacing: 0.18em;
  cursor: pointer;
  text-decoration: none;
}
.btn-seal {
  background: var(--cinnabar);
  color: var(--cream);
}
.btn-seal:hover {
  background: #6e1616;
  text-decoration: none;
}
.btn-ghost {
  background: transparent;
  color: var(--cinnabar);
}
.btn-ghost:hover {
  background: rgba(139, 30, 30, 0.08);
  text-decoration: none;
}

.dl-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.dl-card {
  background: var(--cream);
  border: 1px solid var(--line);
  padding: 28px 24px 24px;
  text-align: center;
}
.dl-card .mark {
  color: var(--cinnabar);
  letter-spacing: 0.4em;
  font-size: 13px;
  margin-bottom: 10px;
}
.dl-card h3 { margin: 0 0 10px; font-size: 20px; font-weight: 600; }
.dl-card p { margin: 0 0 22px; color: var(--muted); font-size: 15px; }
.dl-card .btn-seal { width: 100%; }

.dl-hint {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(58, 42, 26, 0.42);
}
.dl-hint[hidden] { display: none !important; }
.dl-hint-paper {
  width: min(360px, 100%);
  background: var(--cream);
  border: 1px solid var(--line);
  box-shadow: 0 0 0 8px var(--paper);
  padding: 36px 28px 28px;
  text-align: center;
}
.dl-hint-title {
  margin: 0 0 8px;
  font-size: 22px;
  letter-spacing: 0.22em;
  color: var(--cinnabar);
}
.dl-hint-sub {
  margin: 0 0 28px;
  color: var(--muted);
  letter-spacing: 0.28em;
  font-size: 16px;
}
.dl-hint-ok {
  width: 100%;
  padding: 10px 18px;
  border: 1px solid var(--cinnabar);
  background: transparent;
  color: var(--cinnabar);
  font: inherit;
  letter-spacing: 0.18em;
  cursor: pointer;
}
.dl-hint-ok:hover { background: rgba(139, 30, 30, 0.08); }

.rule {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line), transparent);
  border: 0;
  margin: 0;
}

section { padding: 56px 0; }
section h2 {
  margin: 0 0 8px;
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.28em;
  text-align: center;
}
.cap {
  text-align: center;
  color: var(--muted);
  margin: 0 0 36px;
  font-size: 14px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.card {
  background: var(--cream);
  border: 1px solid var(--line);
  padding: 28px 26px 24px;
}
.card .mark {
  color: var(--cinnabar);
  letter-spacing: 0.4em;
  font-size: 13px;
  margin-bottom: 10px;
}
.card h3 { margin: 0 0 10px; font-size: 20px; font-weight: 600; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border: 1px solid var(--line);
  background: var(--cream);
}
.steps article {
  padding: 28px 20px;
  border-right: 1px solid var(--line);
}
.steps article:last-child { border-right: 0; }
.steps .n { color: var(--cinnabar); font-size: 13px; letter-spacing: 0.3em; }
.steps h3 { margin: 8px 0 8px; font-size: 18px; }
.steps p { margin: 0; color: var(--muted); font-size: 14px; }

.about {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 32px;
  align-items: start;
  background: var(--cream);
  border: 1px solid var(--line);
  padding: 36px 32px;
}
.about h3 { margin: 0 0 12px; font-size: 20px; }
.about p { margin: 0 0 12px; color: var(--muted); }
.about p:last-child { margin-bottom: 0; }
.about dl { margin: 0; }
.about dt { font-size: 12px; letter-spacing: 0.2em; color: var(--cinnabar); }
.about dd { margin: 0 0 16px; }

.legal-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.legal-links a {
  display: block;
  text-align: center;
  padding: 22px 12px;
  border: 1px solid var(--line);
  background: var(--cream);
  color: var(--wood);
  text-decoration: none;
  letter-spacing: 0.16em;
}
.legal-links a:hover {
  border-color: var(--cinnabar);
  color: var(--cinnabar);
  text-decoration: none;
}

.site-foot {
  border-top: 1px solid var(--line);
  padding: 28px 0 40px;
  text-align: center;
  font-size: 13px;
  color: var(--muted);
}
.site-foot p { margin: 0 0 6px; }
.site-foot a { color: var(--muted); }
.site-foot a:hover { color: var(--cinnabar); }

.doc {
  padding: 48px 0 72px;
  max-width: 760px;
  margin: 0 auto;
}
.doc h1 { font-size: 28px; letter-spacing: 0.12em; margin: 0 0 8px; }
.doc .meta { color: var(--muted); font-size: 14px; margin-bottom: 32px; }
.doc h2 { text-align: left; letter-spacing: 0.08em; font-size: 18px; margin: 32px 0 12px; }
.doc p { margin: 0 0 14px; text-align: justify; }
.doc ol, .doc ul { padding-left: 1.4em; color: var(--muted); }
.doc li { margin-bottom: 8px; }
.doc table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin: 12px 0 20px;
  background: var(--cream);
}
.doc th, .doc td {
  border: 1px solid var(--line);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}
.doc th { background: #efe0c4; }

@media (max-width: 860px) {
  .grid, .legal-links, .about, .steps, .dl-grid { grid-template-columns: 1fr; }
  .steps article { border-right: 0; border-bottom: 1px solid var(--line); }
  .steps article:last-child { border-bottom: 0; }
  .hero { padding-top: 48px; }
  .site-head .wrap { flex-direction: column; align-items: flex-start; }
}