:root {
  --bg: #f7f6f2;
  --bg-soft: #f1eee6;
  --card: #ffffff;
  --text: #1c1917;
  --muted: #78716c;
  --line: #e7e0d4;
  --primary: #0f766e;
  --accent: #b45309;
  --hero: linear-gradient(120deg,#134e4a 0%,#0f766e 52%,#9a3412 100%);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; }
.wrap { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.topbar {
  background: var(--bg-soft);
  color: var(--muted);
  font-size: 13px;
  border-bottom: 1px solid var(--line);
}
.topbar .wrap { display: flex; justify-content: space-between; gap: 16px; padding: 8px 0; flex-wrap: wrap; }
header {
  position: sticky; top: 0; z-index: 20;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; padding: 14px 0; gap: 20px; }
.brand { display: flex; align-items: center; gap: 12px; }
.logo {
  width: 42px; height: 42px; border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff; display: grid; place-items: center; font-weight: 700; letter-spacing: 1px;
}
.brand h1 { font-size: 16px; line-height: 1.25; }
.brand p { font-size: 12px; color: var(--muted); }
nav ul { display: flex; gap: 8px; list-style: none; flex-wrap: wrap; }
nav a {
  display: block; padding: 8px 14px; border-radius: 999px; color: #334155; font-size: 14px;
}
nav a.active, nav a:hover { background: var(--primary); color: #fff; }
.hero {
  background: var(--hero);
  color: #fff; padding: 84px 0 72px; position: relative; overflow: hidden;
}
.hero::after {
  content: ""; position: absolute; inset: auto -80px -80px auto; width: 320px; height: 320px;
  background: radial-gradient(circle, rgba(255,255,255,.16), transparent 70%);
}
.hero .kicker { letter-spacing: 4px; font-size: 13px; opacity: .8; margin-bottom: 12px; }
.hero h2 { font-size: clamp(28px, 4vw, 44px); line-height: 1.25; max-width: 780px; }
.hero p { margin-top: 16px; max-width: 680px; opacity: .9; }
.btns { display: flex; gap: 12px; margin-top: 28px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; padding: 11px 20px; border-radius: 8px;
  background: var(--accent); color: #fff; font-weight: 600;
}
.btn.ghost { background: transparent; border: 1px solid rgba(255,255,255,.45); }
section { padding: 72px 0; }
.sec-title { text-align: center; margin-bottom: 36px; }
.sec-title h3 { font-size: 28px; }
.sec-title p { color: var(--muted); margin-top: 8px; }
.grid { display: grid; gap: 20px; }
.g-3 { grid-template-columns: repeat(3, 1fr); }
.g-2 { grid-template-columns: repeat(2, 1fr); }
.g-4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 24px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, .04);
}
.card h4 { margin-bottom: 8px; font-size: 18px; }
.card p, .prose p { color: #475569; }
.num { color: var(--primary); font-weight: 700; font-size: 28px; }
.prose { max-width: 860px; margin: 0 auto; }
.prose h3 { margin: 8px 0 16px; font-size: 26px; }
.prose p + p { margin-top: 14px; }
.table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 12px; overflow: hidden; }
.table th, .table td { border: 1px solid var(--line); padding: 12px 14px; text-align: left; }
.table th { background: var(--bg-soft); width: 160px; color: #334155; }
footer {
  background: #0f172a; color: #cbd5e1; padding: 36px 0 22px; font-size: 14px;
}
footer a { color: #e2e8f0; }
.foot { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.icp { margin-top: 18px; padding-top: 14px; border-top: 1px solid #1e293b; color: #94a3b8; font-size: 13px; }
@media (max-width: 860px) {
  .g-3, .g-2, .g-4 { grid-template-columns: 1fr; }
  .nav { flex-direction: column; align-items: flex-start; }
}