:root {
  color: #333333;
  background: #d5f1ff;
  font-family: "Microsoft YaHei", Arial, sans-serif;
}

* { box-sizing: border-box; }

body { margin: 0; background: #d5f1ff; }

a { color: #087fbd; text-decoration: none; }
a:hover, a:focus { color: #005d96; text-decoration: underline; }

.seo-header { background: #ffffff; border-bottom: 3px solid #009cef; }
.seo-shell { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.seo-top { min-height: 88px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.seo-logo { display: block; flex: 0 0 158px; }
.seo-logo img { display: block; width: 158px; height: auto; }
.seo-nav { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px 20px; }
.seo-nav a { color: #555555; font-size: 15px; white-space: nowrap; }
.seo-nav a[aria-current="page"] { color: #009cef; font-weight: 700; }

.seo-hero { padding: 42px 0 34px; color: #ffffff; background: #009cef; }
.seo-hero h1 { margin: 0 0 12px; font-size: 32px; line-height: 1.3; font-weight: 700; }
.seo-hero p { max-width: 760px; margin: 0; font-size: 16px; line-height: 1.8; }
.seo-breadcrumb { padding: 18px 0; font-size: 14px; color: #666666; }
.seo-breadcrumb ol { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; list-style: none; }
.seo-breadcrumb li + li::before { content: "/"; margin-right: 8px; color: #999999; }

.seo-main { padding: 0 180px 54px 0; }
.seo-fixed-menu { position: fixed; top: 50%; right: 16px; z-index: 10; display: flex; flex-direction: column; gap: 10px; transform: translateY(-50%); }
.seo-fixed-entry { display: block; }
.seo-fixed-entry img { display: block; width: 150px; height: auto; }
.seo-section { margin: 0 0 24px; padding: 30px; background: #ffffff; border: 1px solid #8bd8ff; border-radius: 8px; }
.seo-section h2 { margin: 0 0 16px; color: #087fbd; font-size: 23px; line-height: 1.45; }
.seo-section h3 { margin: 22px 0 9px; font-size: 18px; line-height: 1.5; }
.seo-section p, .seo-section li { font-size: 16px; line-height: 1.9; }
.seo-section p { margin: 0 0 14px; }
.seo-section p:last-child { margin-bottom: 0; }
.seo-section ul, .seo-section ol { margin: 0; padding-left: 1.45em; }
.seo-section li + li { margin-top: 8px; }
.seo-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.seo-grid section { padding: 20px; background: #f4fbff; border-left: 4px solid #00bab7; }
.seo-grid h2 { margin-bottom: 8px; font-size: 19px; }
.seo-grid p { margin: 0; }
.seo-faq details { padding: 15px 0; border-bottom: 1px solid #c6eaff; }
.seo-faq details:last-child { border-bottom: 0; }
.seo-faq summary { cursor: pointer; color: #087fbd; font-size: 18px; font-weight: 700; line-height: 1.6; }
.seo-faq p { padding: 8px 0 0; }
.seo-topic-links { display: flex; flex-wrap: wrap; gap: 10px 18px; }

.seo-footer { padding: 32px 0; color: #4c6b7c; background: #ffffff; text-align: center; }
.seo-footer p { margin: 0 0 12px; line-height: 1.7; }
.seo-footer nav { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 18px; }

@media (max-width: 720px) {
  .seo-shell { width: min(100% - 28px, 1120px); }
  .seo-top { padding: 14px 0; align-items: flex-start; flex-direction: column; gap: 10px; }
  .seo-nav { justify-content: flex-start; gap: 8px 14px; }
  .seo-hero { padding: 30px 0 26px; }
  .seo-hero h1 { font-size: 26px; }
  .seo-main { padding-right: 0; }
  .seo-section { padding: 22px 18px; }
  .seo-grid { grid-template-columns: 1fr; }
  .seo-fixed-menu { position: static; flex-direction: row; justify-content: center; padding: 0 14px 24px; transform: none; }
  .seo-fixed-entry img { width: min(42vw, 150px); }
}