* { margin:0; padding:0; box-sizing:border-box; }
:root {
  --primary:#0f766e; --primary-deep:#115e59; --accent:#0d9488;
  --dark:#134e4a; --text:#334155; --muted:#64748b;
  --bg:#f0fdfa; --border:#ccfbf1; --panel:#fff;
}
body { font-family:"Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif; background:var(--bg); color:var(--text); line-height:1.75; }
.container { max-width:1600px; margin:0 auto; padding:0 28px; }
a { color:var(--primary); text-decoration:none; }
a:hover { text-decoration:underline; }
.btn { display:inline-flex; align-items:center; justify-content:center; min-height:42px; padding:0 18px; border-radius:10px; font-weight:600; border:0; cursor:pointer; }
.btn-primary { background:linear-gradient(90deg,var(--primary-deep),var(--accent)); color:#fff; }
.header { background:linear-gradient(105deg,#042f2e,#0f766e 50%,#14b8a6); color:#ccfbf1; position:sticky; top:0; z-index:20; }
.header .container { display:flex; align-items:center; justify-content:space-between; min-height:70px; gap:16px; }
.logo { display:flex; gap:12px; align-items:center; color:#fff; text-decoration:none; }
.logo:hover, .logo:focus { text-decoration:none; color:#fff; }
.logo > span:not(.logo-mark) { display:flex; flex-direction:column; justify-content:center; gap:1px; line-height:1.15; }
.logo-mark { width:40px; height:40px; border-radius:12px; background:linear-gradient(135deg,#5eead4,#0f766e); display:flex; align-items:center; justify-content:center; font-weight:800; color:#042f2e; }
.logo b { display:block; font-size:16px; line-height:1.2; margin:0; } .logo small { display:block; font-size:11px; line-height:1.2; margin:0; opacity:.8; }
.nav { display:flex; gap:16px; list-style:none; flex-wrap:wrap; }
.nav a { color:#99f6e4; font-size:14px; text-decoration:none; }
.nav a:hover { color:#fff; }
.hero { padding:52px 0 32px; text-align:center; background:
  radial-gradient(ellipse 80% 60% at 50% -20%, rgba(45,212,191,.35), transparent),
  linear-gradient(180deg,#ecfdf5,var(--bg)); }
.hero-kicker { font-size:13px; letter-spacing:.04em; color:var(--primary); font-weight:700; margin-bottom:8px; }
.hero h1 { font-size:clamp(28px,3.2vw,42px); color:var(--dark); font-weight:800; }
.hero p { margin:12px auto 0; max-width:820px; color:var(--muted); }
.search-box { margin:22px auto 0; max-width:560px; }
.search-box input { width:100%; height:48px; border:1px solid var(--border); border-radius:12px; padding:0 16px; font-size:15px; background:#fff; outline:none; box-shadow:0 8px 24px rgba(15,118,110,.08); }
.search-box input:focus { border-color:var(--accent); }
.search-hint { margin-top:10px; font-size:13px; color:#b45309; }
.section { padding:22px 0; }
.section h2 { font-size:22px; color:var(--dark); margin-bottom:14px; display:flex; align-items:baseline; gap:10px; }
.section h2 .count { font-size:13px; color:var(--muted); font-weight:500; }
.grid { display:grid; grid-template-columns:repeat(3,1fr); gap:14px; }
.card { background:var(--panel); border:1px solid var(--border); border-radius:14px; padding:18px; transition:.2s; display:block; color:inherit; text-decoration:none; }
.card:hover { transform:translateY(-2px); box-shadow:0 12px 28px rgba(15,118,110,.1); text-decoration:none; }
.card .cat { font-size:12px; color:var(--primary); font-weight:700; }
.card b { display:block; margin:6px 0 2px; color:var(--dark); font-size:18px; }
.card .sub { display:block; font-size:13px; color:var(--muted); margin-bottom:6px; }
.card p { font-size:13px; color:var(--muted); }
.breadcrumb { padding:16px 0 0; font-size:13px; color:var(--muted); }
.breadcrumb a { color:var(--primary-deep); }
.article-wrap { display:grid; grid-template-columns:1fr 300px; gap:24px; padding:20px 0 40px; }
.article { background:#fff; border:1px solid var(--border); border-radius:16px; padding:32px; }
.term-badge { display:inline-block; font-size:12px; font-weight:700; color:var(--primary); background:#ccfbf1; padding:4px 10px; border-radius:8px; margin-bottom:12px; }
.article h1 { font-size:28px; color:var(--dark); line-height:1.35; margin-bottom:10px; }
.article .meta { font-size:13px; color:var(--muted); margin-bottom:22px; }
.article h2 { font-size:20px; margin:24px 0 10px; color:var(--dark); }
.article h3 { font-size:16px; margin:14px 0 6px; color:var(--dark); }
.article ul,.article ol { padding-left:20px; margin:8px 0 14px; }
.article li { margin:6px 0; }
.article p { margin:10px 0; }
.faq-item { background:#f8fafc; border:1px solid #e2e8f0; border-radius:12px; padding:14px 16px; margin:10px 0; }
.side .card { margin-bottom:12px; }
.cta-box { background:#ecfdf5; border:1px solid #99f6e4; border-radius:14px; padding:16px; margin-top:24px; }
.friend-links { background:#fff; border-top:1px solid var(--border); padding:24px 0; }
.friend-links-title { font-size:15px; font-weight:700; color:var(--dark); margin-bottom:12px; }
.friend-links-list { list-style:none; display:flex; flex-wrap:wrap; gap:10px 18px; }
.friend-links-list a { color:var(--muted); font-size:13px; }
.footer { background:#042f2e; color:#94a3b8; padding:36px 0 0; margin-top:20px; }
.footer-grid { display:grid; grid-template-columns:2fr 1fr 1fr; gap:20px; padding-bottom:24px; }
.footer b,.footer h4 { color:#e2e8f0; display:block; margin-bottom:10px; }
.footer a { color:#5eead4; display:block; margin:6px 0; font-size:14px; }
.footer-copy { border-top:1px solid #134e4a; text-align:center; padding:16px 0 24px; font-size:13px; }
.page-404 { padding:70px 0; text-align:center; }
.page-404-box { max-width:640px; margin:0 auto; background:#fff; border:1px solid var(--border); border-radius:16px; padding:40px 24px; }
.page-404-code { font-size:72px; font-weight:800; color:var(--primary); }
@media (max-width:1000px) {
  .grid,.article-wrap,.footer-grid { grid-template-columns:1fr; }
  .nav { display:none; }
}