:root {
  --ink: #15202b;
  --muted: #5a6675;
  --line: #d9e0e8;
  --bg: #f4f6f8;
  --card: #fff;
  --accent: #0d6b66;
  --accent-2: #c45c26;
  --soft: #e7f3f2;
  --shadow: 0 16px 40px rgba(21, 32, 43, 0.07);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(900px 420px at 0% -5%, #dff0ee 0%, transparent 55%),
    radial-gradient(700px 360px at 100% 0%, #efe8e1 0%, transparent 50%),
    var(--bg);
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
header.top {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(10px);
  background: rgba(244,246,248,.88);
  border-bottom: 1px solid var(--line);
}
.top__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 14px 0;
}
.brand {
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-weight: 700; font-size: 20px; letter-spacing: .04em; color: var(--ink);
}
nav { display: flex; flex-wrap: wrap; gap: 14px; font-size: 14px; }
nav a { color: var(--muted); }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 10px 16px; border-radius: 10px; font-weight: 600; font-size: 14px;
  border: 1px solid transparent;
}
.btn--primary { background: var(--accent); color: #fff; }
.btn--primary:hover { text-decoration: none; filter: brightness(1.05); }
.btn--ghost { background: #fff; border-color: var(--line); color: var(--ink); }
.hero { padding: 48px 0 20px; }
.hero__badge {
  display: inline-block; padding: 4px 12px; border-radius: 999px;
  background: var(--soft); color: var(--accent); font-size: 12px; font-weight: 700;
  letter-spacing: .08em;
}
.crumb {
  margin: 10px 0 0; font-size: 13px; color: var(--muted);
}
.crumb a { color: var(--muted); }
h1 {
  margin: 16px 0 12px;
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-size: clamp(26px, 4.5vw, 40px);
  line-height: 1.25; font-weight: 700;
}
.hero__desc { max-width: 820px; color: var(--muted); font-size: 16px; margin: 0 0 22px; }
.hero__ctas { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 20px; }
.kw-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.kw {
  padding: 6px 12px; border-radius: 999px; background: #fff;
  border: 1px solid var(--line); color: var(--muted); font-size: 13px;
}
.kw--hot { border-color: #c9e4e2; background: var(--soft); color: var(--accent); font-weight: 600; }
section.block { padding: 28px 0; }
h2 {
  margin: 0 0 8px;
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-size: 26px; font-weight: 700;
}
.lead { color: var(--muted); margin: 0 0 18px; max-width: 860px; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 16px;
  padding: 20px 22px; box-shadow: var(--shadow);
}
.card h3 { margin: 0 0 8px; font-size: 18px; font-family: "Songti SC", "STSong", "SimSun", serif; }
.card p { margin: 0 0 12px; color: var(--muted); font-size: 14px; }
.card ul { margin: 0; padding-left: 18px; font-size: 14px; }
.card li { margin: 4px 0; }
.card a.more {
  display: inline-block; margin-top: 10px; font-size: 13px; font-weight: 600;
}
.feat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.feat {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 18px 20px;
}
.feat h3 { margin: 0 0 6px; font-size: 16px; }
.feat p { margin: 0; color: var(--muted); font-size: 14px; }
.feat a.more { display: inline-block; margin-top: 10px; font-size: 13px; font-weight: 600; }
.tag {
  display: inline-block; margin-bottom: 8px; font-size: 11px; font-weight: 700;
  letter-spacing: .06em; color: var(--accent-2);
}
.prose {
  background: var(--card); border: 1px solid var(--line); border-radius: 16px;
  padding: 22px 24px; box-shadow: var(--shadow); max-width: 920px;
}
.prose p { margin: 0 0 14px; color: #2b3442; font-size: 15px; }
.prose h2 {
  margin: 28px 0 12px;
  font-size: 20px;
  padding-top: 8px;
  border-top: 1px dashed var(--line);
}
.prose h2:first-child { margin-top: 0; border-top: none; padding-top: 0; }
.prose h3 {
  margin: 18px 0 8px;
  font-size: 16px;
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-weight: 700;
}
.prose ul, .prose ol { margin: 0 0 14px; padding-left: 20px; }
.prose li { margin: 6px 0; color: #2b3442; font-size: 15px; }
.prose .note {
  margin: 16px 0;
  padding: 12px 14px;
  border-radius: 10px;
  background: var(--soft);
  border: 1px solid #c9e4e2;
  color: #245652;
  font-size: 14px;
}
.article-wide { max-width: 920px; }
.steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 0 0 16px;
}
.steps li {
  position: relative;
  padding: 12px 12px 12px 48px;
  margin: 0 0 10px;
  background: #f8fafb;
  border: 1px solid var(--line);
  border-radius: 12px;
}
.steps li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 12px; top: 12px;
  width: 26px; height: 26px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 13px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.related { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.related a {
  padding: 8px 12px; border-radius: 10px; background: #fff;
  border: 1px solid var(--line); font-size: 13px; color: var(--ink);
}
.related a:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.faq-list a {
  display: block; background: var(--card); border: 1px solid var(--line);
  border-radius: 12px; padding: 14px 16px; margin-bottom: 10px;
  color: var(--ink); font-weight: 600;
}
.faq-list a:hover { border-color: var(--accent); text-decoration: none; }
.faq-list a span { display: block; margin-top: 4px; font-weight: 400; color: var(--muted); font-size: 13px; }
footer.site {
  margin-top: 24px; padding: 28px 0 48px; border-top: 1px solid var(--line);
  color: var(--muted); font-size: 13px;
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
}
.cta-bar {
  margin: 20px 0 0; padding: 22px 24px; border-radius: 16px;
  background: linear-gradient(120deg, #0d6b66, #164e63);
  color: #fff; display: flex; flex-wrap: wrap; align-items: center;
  justify-content: space-between; gap: 14px;
}
.cta-bar p { margin: 0; opacity: .92; }
.cta-bar .btn--primary { background: #fff; color: var(--accent); }
@media (max-width: 900px) {
  .cards, .feat-grid { grid-template-columns: 1fr; }
  nav { display: none; }
}