:root {
  --v: #7c3aed;
  --v-dark: #5b21b6;
  --v-soft: #f5f0ff;
  --line: #ebe5f8;
  --ink: #232128;
  --muted: #6f6a7a;
  --bg: #fff;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
.seo-skip { position: absolute; left: -999px; top: 0; }
.seo-skip:focus { left: 12px; top: 12px; z-index: 99; background: #fff; padding: 8px 12px; border-radius: 8px; }
.seo-wrap { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 24px; }

.seo-header {
  position: sticky; top: 0; z-index: 40;
  background: rgba(255,255,255,.92);
  border-bottom: 1px solid rgba(235,229,248,.9);
  backdrop-filter: blur(14px);
}
.seo-nav { height: 68px; display: flex; align-items: center; gap: 24px; }
.seo-logo { display: inline-flex; align-items: center; gap: 10px; flex: none; }
.seo-logo-mark {
  width: 34px; height: 34px; border-radius: 10px; display: inline-flex;
  align-items: center; justify-content: center; color: #fff; font-weight: 800;
  background: linear-gradient(135deg, #7c3aed, #a78bfa);
  box-shadow: 0 7px 16px rgba(124,58,237,.22);
}
.seo-logo b { display: block; font-size: 15px; line-height: 1.2; }
.seo-logo small { display: block; color: var(--muted); font-size: 9px; letter-spacing: .03em; }
.seo-links { display: flex; align-items: center; gap: 22px; margin-left: 12px; font-size: 13px; color: #4f4a5c; }
.seo-links a:hover { color: var(--v); }
.seo-nav-actions { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.seo-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  min-height: 38px; padding: 0 15px; border-radius: 9px; border: 1px solid transparent;
  font-size: 13px; font-weight: 600; transition: transform .15s, box-shadow .15s, background .15s;
}
.seo-btn:hover { transform: translateY(-1px); }
.seo-btn-primary {
  color: #fff; background: linear-gradient(135deg, #7c3aed, #a855f7);
  box-shadow: 0 8px 20px rgba(124,58,237,.24);
}
.seo-btn-ghost { color: #4f2bb8; background: #f5f0ff; border-color: #e8dcff; }
.seo-btn-light { color: #5b21b6; background: #fff; }
.seo-btn-outline { color: #fff; border-color: rgba(255,255,255,.36); }
.seo-menu { display: none; }

.seo-hero {
  position: relative; overflow: hidden; padding: 64px 0 56px;
  background:
    radial-gradient(850px 400px at 12% -10%, rgba(167,139,250,.24), transparent 65%),
    radial-gradient(700px 380px at 92% 0%, rgba(96,165,250,.12), transparent 60%),
    linear-gradient(180deg, #fbfaff 0%, #fff 82%);
}
.seo-hero-grid { display: grid; grid-template-columns: minmax(0,1.22fr) minmax(280px,.78fr); gap: 44px; align-items: center; }
.seo-breadcrumb { display: flex; align-items: center; gap: 7px; margin-bottom: 14px; color: #8b8599; font-size: 11px; }
.seo-breadcrumb a:hover { color: var(--v); }
.seo-badge {
  display: inline-flex; align-items: center; gap: 6px; padding: 5px 11px; border-radius: 999px;
  color: #5b21b6; background: rgba(124,58,237,.08); border: 1px solid rgba(124,58,237,.14);
  font-size: 11px; font-weight: 700;
}
.seo-hero h1 {
  margin: 16px 0 14px; font-size: clamp(34px, 4.6vw, 52px); line-height: 1.14;
  letter-spacing: -0.035em; font-weight: 800;
}
.seo-hero h1 em {
  font-style: normal; color: var(--v);
  background: linear-gradient(120deg, #7c3aed, #b06bff 60%, #7c3aed);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.seo-sub { max-width: 690px; margin: 0; color: var(--muted); font-size: 16px; line-height: 1.9; }
.seo-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.seo-points { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; }
.seo-points span { font-size: 11px; color: #5d5768; background: rgba(255,255,255,.85); border: 1px solid var(--line); border-radius: 999px; padding: 4px 10px; }
.seo-hero-card {
  background: #fff; border: 1px solid var(--line); border-radius: 20px;
  padding: 22px; box-shadow: 0 28px 70px rgba(60,30,120,.1);
}
.seo-hero-card h2 { margin: 0 0 4px; font-size: 17px; }
.seo-hero-card > p { margin: 0 0 16px; color: var(--muted); font-size: 12px; }
.seo-mini-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 0; border-top: 1px solid #f4f0fb; font-size: 12px; }
.seo-mini-row span { color: var(--muted); }
.seo-mini-row b { color: var(--ink); font-weight: 650; }
.seo-mini-row b.green { color: #15803d; }
.seo-mini-bar { height: 6px; background: #efe9fb; border-radius: 99px; overflow: hidden; margin-top: 7px; }
.seo-mini-bar i { display: block; height: 100%; border-radius: 99px; background: linear-gradient(90deg, #8b5cf6, #c084fc); }

.seo-section { padding: 68px 0; }
.seo-section.soft { background: linear-gradient(180deg, #fbfaff, #f7f4ff); border-top: 1px solid rgba(235,229,248,.6); border-bottom: 1px solid rgba(235,229,248,.6); }
.seo-section-head { max-width: 780px; margin-bottom: 30px; }
.seo-section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.seo-kicker { color: var(--v); font-size: 11px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.seo-section h2 { margin: 6px 0 10px; font-size: clamp(25px, 3.1vw, 35px); line-height: 1.28; letter-spacing: -0.025em; }
.seo-section h3 { margin: 0 0 8px; font-size: 18px; letter-spacing: -0.01em; }
.seo-section p { margin: 0 0 12px; color: var(--muted); font-size: 14px; line-height: 1.9; }
.seo-section p:last-child { margin-bottom: 0; }
.seo-grid { display: grid; gap: 16px; }
.seo-grid-3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
.seo-grid-2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
.seo-card { background: #fff; border: 1px solid var(--line); border-radius: 15px; padding: 22px; }
.seo-card-num { display: inline-flex; width: 28px; height: 28px; border-radius: 8px; align-items: center; justify-content: center; background: #f3ecff; color: var(--v-dark); font-size: 11px; font-weight: 800; margin-bottom: 11px; }
.seo-card p { font-size: 13px; line-height: 1.8; }
.seo-table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 13px; background: #fff; }
.seo-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.seo-table th, .seo-table td { padding: 13px 16px; text-align: left; border-bottom: 1px solid #f2eef9; vertical-align: top; }
.seo-table th { background: #fbfaff; color: #4f4a5c; font-weight: 700; white-space: nowrap; }
.seo-table tr:last-child td { border-bottom: 0; }
.seo-faq { display: grid; gap: 9px; }
.seo-faq details { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 15px 18px; }
.seo-faq summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; gap: 12px; font-size: 14px; font-weight: 700; }
.seo-faq summary::-webkit-details-marker { display: none; }
.seo-faq summary::after { content: '+'; color: var(--v); font-size: 18px; line-height: 1; }
.seo-faq details[open] summary::after { transform: rotate(45deg); }
.seo-faq p { margin: 9px 0 0; font-size: 13px; line-height: 1.85; }
.seo-list { margin: 0; padding-left: 20px; color: var(--muted); font-size: 14px; line-height: 1.9; }
.seo-list li { margin-bottom: 6px; }
.seo-note { border-left: 3px solid #c4b5fd; background: #fbf9ff; border-radius: 0 9px 9px 0; padding: 12px 14px; color: #5b5570; font-size: 13px; line-height: 1.8; }
.seo-related { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 12px; }
.seo-related a { display: block; background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 16px; transition: border-color .15s, box-shadow .15s, transform .15s; }
.seo-related a:hover { border-color: rgba(124,58,237,.35); box-shadow: 0 12px 28px rgba(60,30,120,.07); transform: translateY(-1px); }
.seo-related b { display: block; margin-bottom: 4px; font-size: 14px; }
.seo-related span { color: var(--muted); font-size: 12px; }
.seo-cta-band {
  color: #fff; border-radius: 22px; padding: 38px 34px;
  background: radial-gradient(500px 260px at 85% 0%, rgba(192,132,252,.35), transparent 60%), linear-gradient(120deg, #3b1177, #5b21b6 50%, #7c3aed);
  display: flex; align-items: center; justify-content: space-between; gap: 22px; flex-wrap: wrap;
  box-shadow: 0 26px 60px rgba(60,20,120,.2);
}
.seo-cta-band h2 { margin: 0 0 6px; font-size: clamp(23px, 2.8vw, 32px); letter-spacing: -0.02em; }
.seo-cta-band p { margin: 0; color: rgba(255,255,255,.72); font-size: 13px; }

.seo-footer { background: #0f0d18; color: rgba(255,255,255,.66); padding: 44px 0 22px; }
.seo-footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 30px; }
.seo-footer h4 { margin: 0 0 9px; color: #fff; font-size: 13px; }
.seo-footer a { display: block; padding: 3px 0; font-size: 12px; color: rgba(255,255,255,.58); }
.seo-footer a:hover { color: #fff; }
.seo-footer p { margin: 8px 0 0; color: rgba(255,255,255,.46); font-size: 11px; line-height: 1.8; }
.seo-footer .seo-logo { display: inline-flex; }
.seo-footer .seo-logo-mark { width: 36px; height: 36px; font-size: 17px; }
.seo-footer .seo-logo b { font-size: 15px; }
.seo-footer .seo-logo small { font-size: 9px; }
.seo-footer-bottom { margin-top: 28px; padding-top: 16px; border-top: 1px solid rgba(255,255,255,.1); color: rgba(255,255,255,.35); font-size: 10px; display: flex; justify-content: space-between; align-items: center; gap: 10px 20px; flex-wrap: wrap; }
.seo-footer-beian { display: inline-flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.seo-footer-bottom a { color: rgba(255,255,255,.45); }
.seo-footer-bottom a:hover { color: #fff; }

@media (max-width: 900px) {
  .seo-links { display: none; }
  .seo-menu { display: inline-flex; }
  .seo-hero-grid { grid-template-columns: 1fr; gap: 28px; }
  .seo-grid-3 { grid-template-columns: 1fr 1fr; }
  .seo-related { grid-template-columns: 1fr; }
  .seo-footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 620px) {
  .seo-wrap { padding: 0 18px; }
  .seo-nav { height: 60px; gap: 12px; }
  .seo-nav-actions .seo-btn-ghost { display: none; }
  .seo-hero { padding: 38px 0 34px; }
  .seo-hero h1 { font-size: 34px; }
  .seo-sub { font-size: 14px; }
  .seo-section { padding: 44px 0; }
  .seo-grid-3, .seo-grid-2 { grid-template-columns: 1fr; }
  .seo-cta-band { padding: 28px 22px; }
  .seo-footer-grid { grid-template-columns: 1fr; gap: 22px; }
  .seo-table th, .seo-table td { padding: 10px 12px; font-size: 12px; }
}
.seo-header .seo-logo-mark { width: 34px; height: 34px; font-size: 16px; }
@media (max-width: 620px) {
  .seo-header .seo-logo-mark { width: 30px; height: 30px; font-size: 14px; }
  .seo-logo b { font-size: 14px; }
  .seo-logo small { font-size: 8px; }
}