:root {
  --seo-bg: #f5f6f8;
  --seo-panel: #ffffff;
  --seo-border: #dfe3e8;
  --seo-text: #171a21;
  --seo-muted: #5f6672;
  --seo-blue: #315fc9;
  --seo-green: #167a5a;
  --seo-red: #b34040;
}

.seo-body {
  margin: 0;
  color: var(--seo-text);
  background: var(--seo-bg);
  font-family: Inter, "Microsoft YaHei", system-ui, sans-serif;
  line-height: 1.75;
}

.seo-body * { box-sizing: border-box; }
.seo-body a { color: inherit; }
.seo-shell { width: min(1120px, calc(100% - 40px)); margin-inline: auto; }

.seo-topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--seo-border);
  background: rgba(255, 255, 255, .96);
  backdrop-filter: blur(12px);
}

.seo-topbar-inner {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.seo-brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 800; }
.seo-brand img { width: 34px; height: 34px; }
.seo-nav { display: flex; align-items: center; gap: 18px; }
.seo-nav a { color: var(--seo-muted); text-decoration: none; font-size: 14px; font-weight: 600; }
.seo-nav a:hover { color: var(--seo-text); }

.seo-hero {
  min-height: 520px;
  position: relative;
  isolation: isolate;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  color: #fff;
  background-image: var(--seo-hero-image);
  background-position: center;
  background-size: cover;
}

.seo-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0;
  background: rgba(5, 8, 14, .64);
}

.seo-hero-content { padding-block: 112px 76px; }
.seo-eyebrow { margin: 0 0 10px; color: #9fb7ff; font-size: 13px; font-weight: 800; text-transform: uppercase; }
.seo-hero h1 { max-width: 850px; margin: 0; font-size: 54px; line-height: 1.18; letter-spacing: 0; }
.seo-hero-lead { max-width: 760px; margin: 22px 0 0; color: #e1e4ea; font-size: 19px; }

.seo-primary-link,
.seo-inline-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  margin-top: 28px;
  padding: 10px 18px;
  border-radius: 6px;
  color: #17223d;
  background: #fff;
  text-decoration: none;
  font-weight: 800;
}

.seo-body a.seo-primary-link,
.seo-body a.seo-inline-link { color: #17223d; }

.seo-hero h1,
.seo-hero-lead,
.seo-section-head h2,
.seo-section-head p,
.seo-feature,
.seo-use {
  max-width: 100%;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.seo-band { padding: 68px 0; border-bottom: 1px solid var(--seo-border); background: var(--seo-panel); }
.seo-band--muted { background: var(--seo-bg); }
.seo-section-head { max-width: 780px; margin-bottom: 30px; }
.seo-section-head h2 { margin: 0; font-size: 34px; line-height: 1.3; letter-spacing: 0; }
.seo-section-head p { margin: 12px 0 0; color: var(--seo-muted); }

.seo-feature-grid,
.seo-use-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.seo-feature,
.seo-use {
  min-width: 0;
  padding: 24px;
  border: 1px solid var(--seo-border);
  border-radius: 6px;
  background: var(--seo-panel);
}

.seo-feature strong,
.seo-use h3 { display: block; margin: 0 0 8px; font-size: 18px; }
.seo-feature p,
.seo-use p { margin: 0; color: var(--seo-muted); font-size: 15px; }
.seo-use a { display: inline-block; margin-top: 16px; color: var(--seo-blue); font-weight: 700; text-decoration: none; }
.seo-use a:hover { text-decoration: underline; }

.seo-steps { margin: 0; padding: 0; list-style: none; counter-reset: seo-step; }
.seo-steps li { position: relative; min-height: 80px; padding: 0 0 30px 72px; counter-increment: seo-step; }
.seo-steps li::before {
  content: counter(seo-step);
  position: absolute;
  left: 0;
  top: 0;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: #fff;
  background: var(--seo-blue);
  font-weight: 800;
}
.seo-steps strong { display: block; margin-bottom: 5px; font-size: 18px; }
.seo-steps p { margin: 0; color: var(--seo-muted); }

.seo-faq { border-top: 1px solid var(--seo-border); }
.seo-faq details { border-bottom: 1px solid var(--seo-border); padding: 19px 0; }
.seo-faq summary { cursor: pointer; font-weight: 800; }
.seo-faq p { max-width: 850px; margin: 12px 0 0; color: var(--seo-muted); }

.seo-related-section { margin: 48px 0 24px; padding: 34px 0; border-top: 1px solid var(--seo-border); }
.seo-related-section h2 { margin: 0 0 18px; font-size: 28px; }
.seo-related-links { display: flex; flex-wrap: wrap; gap: 10px; }
.seo-related-links a {
  padding: 9px 12px;
  border: 1px solid var(--seo-border);
  border-radius: 6px;
  color: var(--seo-text);
  background: var(--seo-panel);
  text-decoration: none;
  font-size: 14px;
  font-weight: 700;
}
.seo-related-links a:hover { border-color: #9ca9bd; }

.seo-cta { padding: 70px 0; color: #fff; background: #171b24; text-align: center; }
.seo-cta h2 { margin: 0; font-size: 36px; }
.seo-cta p { margin: 12px 0 0; color: #cdd2dc; }
.seo-footer { padding: 28px 0; color: var(--seo-muted); background: #fff; font-size: 13px; }
.seo-footer-inner { display: flex; justify-content: space-between; gap: 20px; }
.seo-footer nav { display: flex; flex-wrap: wrap; gap: 14px; }
.seo-footer a { text-decoration: none; }

@media (max-width: 760px) {
  .seo-shell { width: min(calc(100% - 28px), 1120px); }
  .seo-topbar-inner { min-height: 58px; }
  .seo-nav a:nth-child(2), .seo-nav a:nth-child(3) { display: none; }
  .seo-hero { min-height: 480px; }
  .seo-hero-content { padding-block: 92px 54px; }
  .seo-hero h1 { font-size: 37px; }
  .seo-hero-lead { font-size: 16px; }
  .seo-band { padding: 48px 0; }
  .seo-section-head h2 { font-size: 28px; }
  .seo-feature-grid, .seo-use-grid { grid-template-columns: 1fr; }
  .seo-footer-inner { flex-direction: column; }
}