:root {
  color-scheme: light;
  --ink: #20272d;
  --muted: #667078;
  --paper: #f6f5f1;
  --white: #ffffff;
  --soft: #edf2f1;
  --line: #d9dedc;
  --brand: #15586d;
  --brand-dark: #0e4050;
  --accent: #9b473d;
  --notice: #f7eedc;
  --max: 1160px;
}

* { box-sizing: border-box; }
html { overflow-x: hidden; scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 0;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}
a { color: var(--brand-dark); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--accent); }
img, svg { display: block; max-width: 100%; height: auto; }
button, input { font: inherit; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.skip-link { position: absolute; top: -80px; left: 16px; z-index: 100; padding: 10px 16px; background: var(--ink); color: #fff; }
.skip-link:focus { top: 12px; }

.site-header { position: sticky; top: 0; z-index: 30; border-bottom: 1px solid var(--line); background: #fff; }
.header-inner { width: min(var(--max), calc(100% - 40px)); min-height: 70px; margin: 0 auto; display: flex; align-items: center; gap: 26px; }
.brand { display: inline-flex; align-items: center; gap: 10px; flex: 0 0 auto; color: var(--ink); font-weight: 800; font-size: 20px; text-decoration: none; letter-spacing: .02em; }
.brand img { width: 36px; height: 36px; }
.main-nav { margin-left: auto; display: flex; align-items: center; gap: 2px; }
.main-nav a { padding: 10px 11px 8px; border-bottom: 2px solid transparent; color: #30383d; text-decoration: none; font-size: 14px; font-weight: 650; }
.main-nav a:hover, .main-nav a[aria-current="page"] { border-bottom-color: var(--brand); color: var(--brand-dark); }
.search-link { margin-left: 5px; border: 1px solid var(--line); border-radius: 3px; }
.main-nav .search-link:hover { border-color: var(--brand); }
.menu-toggle { display: none; margin-left: auto; border: 1px solid var(--line); border-radius: 3px; background: #fff; padding: 8px 11px; color: var(--ink); }

.page-shell { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; padding: 24px 0 68px; }
.breadcrumb { margin: 0 0 20px; color: var(--muted); font-size: 14px; }
.breadcrumb ol { display: flex; gap: 7px; flex-wrap: wrap; list-style: none; margin: 0; padding: 0; }
.breadcrumb li:not(:last-child)::after { content: "/"; margin-left: 7px; color: #a5adae; }
.breadcrumb a { color: var(--muted); }

.home-intro { border-bottom: 1px solid var(--line); background: #fff; padding: 58px 0 54px; }
.home-intro-inner { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(300px, .7fr); gap: 64px; align-items: start; }
.section-label { margin: 0 0 10px; color: var(--accent); font-size: 13px; font-weight: 800; letter-spacing: .08em; }
.home-intro h1 { max-width: 720px; margin: 0; font-size: clamp(36px, 5vw, 54px); line-height: 1.18; letter-spacing: -.035em; }
.home-intro-copy > p:not(.section-label) { max-width: 720px; margin: 20px 0 0; color: #4d585f; font-size: 18px; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 18px; margin-top: 28px; }
.button { display: inline-flex; justify-content: center; align-items: center; min-height: 44px; padding: 9px 17px; border: 1px solid var(--brand); border-radius: 3px; background: var(--brand); color: #fff; font-weight: 750; text-decoration: none; }
.button:hover { border-color: var(--brand-dark); background: var(--brand-dark); color: #fff; }
.text-link { font-weight: 700; }
.home-start { border-left: 3px solid var(--brand); padding: 3px 0 3px 24px; }
.home-start h2 { margin: 0 0 14px; font-size: 21px; }
.home-start ul { margin: 0; padding: 0; list-style: none; }
.home-start li { padding: 13px 0; border-top: 1px solid var(--line); }
.home-start li:last-child { border-bottom: 1px solid var(--line); }
.home-start strong, .home-start span { display: block; }
.home-start strong { margin-bottom: 3px; font-size: 14px; }
.home-start span { color: var(--muted); font-size: 14px; }

.home-section { padding: 54px 0; }
.home-section.alt { border-block: 1px solid var(--line); background: var(--soft); }
.section-inner { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 24px; }
.section-heading h2, .page-hero h1 { margin: 0; line-height: 1.22; letter-spacing: -.02em; }
.section-heading h2 { font-size: clamp(27px, 3.5vw, 37px); }
.section-heading p { max-width: 600px; margin: 0; color: var(--muted); }
.card-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.card { min-width: 0; border: 1px solid var(--line); border-top: 3px solid var(--brand); border-radius: 4px; background: var(--white); padding: 21px; }
.card h2, .card h3 { margin: 0 0 9px; line-height: 1.4; overflow-wrap: anywhere; }
.card h2 { font-size: 19px; }
.card h3 { font-size: 18px; }
.card p { margin: 0; color: var(--muted); }
.card-link { display: block; color: var(--ink); text-decoration: none; }
.card-link:hover h2, .card-link:hover h3 { color: var(--accent); }
.card-category, .list-label { display: block; margin-bottom: 8px; color: var(--muted); font-size: 12px; font-weight: 750; }
.category-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.category-item { min-width: 0; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #fff; padding: 22px; }
.category-item h2, .category-item h3 { margin: 0 0 7px; font-size: 18px; line-height: 1.4; }
.category-item p { margin: 0; color: var(--muted); }
.category-item .row-link { display: inline-block; margin-top: 13px; }
.home-links { display: grid; grid-template-columns: .8fr 1.2fr; gap: 60px; }
.home-links h2 { margin: 0; font-size: 32px; line-height: 1.3; }
.home-links ul { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.home-links li { display: grid; grid-template-columns: 180px 1fr; gap: 18px; padding: 15px 0; border-bottom: 1px solid var(--line); }
.home-links li a { font-weight: 750; }
.home-links li span { color: var(--muted); }

.page-hero { margin-bottom: 30px; border-bottom: 1px solid var(--line); padding: 28px 0 30px; }
.page-hero h1 { max-width: 850px; font-size: clamp(31px, 4.5vw, 48px); overflow-wrap: anywhere; }
.page-hero p:not(.section-label) { max-width: 760px; margin: 14px 0 0; color: var(--muted); font-size: 17px; }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 28px; align-items: start; }
.article { min-width: 0; border: 1px solid var(--line); border-top: 4px solid var(--brand); border-radius: 3px; background: #fff; padding: clamp(27px, 4.5vw, 52px); }
.article-category { display: inline-block; margin-bottom: 11px; color: var(--accent); font-size: 13px; font-weight: 800; }
.article h1 { margin: 0; font-size: clamp(30px, 4.2vw, 45px); line-height: 1.22; letter-spacing: -.025em; overflow-wrap: anywhere; }
.article .lede { margin: 18px 0 28px; color: #48545b; font-size: 18px; }
.article-section { padding: 27px 0; border-top: 1px solid var(--line); }
.article-section h2 { margin: 0 0 12px; font-size: 24px; line-height: 1.4; }
.article-section p { margin: 0 0 14px; }
.article-section p:last-child { margin-bottom: 0; }
.article-section ul, .article-section ol { margin: 12px 0 0; padding-left: 23px; }
.article-section li + li { margin-top: 8px; }
.notice { margin-top: 14px; border-left: 3px solid #c17a3e; background: var(--notice); padding: 16px 18px; color: #55452f; }
.side-panel { position: sticky; top: 92px; display: grid; gap: 16px; }
.side-panel .card { border-top-width: 2px; padding: 18px; }
.side-panel ul { margin: 0; padding: 0; list-style: none; }
.side-panel li + li { margin-top: 9px; }
.side-panel a { overflow-wrap: anywhere; }
.faq details { border-top: 1px solid var(--line); padding: 15px 0; }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; font-weight: 750; }
.faq p { margin-top: 9px; color: var(--muted); }

.list-stack { display: grid; gap: 12px; }
.list-row { display: grid; grid-template-columns: 1fr auto; gap: 22px; align-items: center; border: 1px solid var(--line); border-left: 3px solid var(--brand); background: #fff; padding: 18px 20px; }
.list-row h2, .list-row h3 { margin: 0; font-size: 19px; overflow-wrap: anywhere; }
.list-row p { margin: 6px 0 0; color: var(--muted); font-size: 14px; }
.row-link { white-space: nowrap; font-size: 14px; font-weight: 750; }
.pagination { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 28px; }
.pagination a, .pagination span { display: grid; place-items: center; min-width: 38px; min-height: 38px; border: 1px solid var(--line); border-radius: 2px; background: #fff; text-decoration: none; }
.pagination [aria-current="page"] { border-color: var(--brand); background: var(--brand); color: #fff; }
.empty-state { border: 1px solid var(--line); background: #fff; padding: 30px; color: var(--muted); }
.empty-state h2 { margin: 0 0 6px; color: var(--ink); font-size: 20px; }
.empty-state p { margin: 0 0 10px; }

.content-panel { border: 1px solid var(--line); background: #fff; padding: clamp(25px, 4.5vw, 46px); }
.content-panel h2 { margin-top: 30px; }
.content-panel h2:first-child { margin-top: 0; }
.about-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0; padding: 0; }
.about-grid > div { padding: 30px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.about-grid > div:nth-child(2n) { border-right: 0; }
.about-grid > div:nth-last-child(-n+2) { border-bottom: 0; }
.about-grid h2 { margin: 0 0 9px; }
.about-grid p, .about-grid ul { margin: 0; }
.service-list { border-top: 1px solid var(--line); }
.service-list section { display: grid; grid-template-columns: minmax(180px, .35fr) 1fr; gap: 28px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.service-list h2, .service-list p { margin: 0; }
.service-list h2 { font-size: 22px; }
.service-list p { color: var(--muted); }
.entity-panel { max-width: 760px; }
.entity-panel dl { margin: 0; }
.entity-panel dl > div { display: grid; grid-template-columns: 150px 1fr; gap: 20px; padding: 17px 0; border-bottom: 1px solid var(--line); }
.entity-panel dl > div:first-child { padding-top: 0; }
.entity-panel dl > div:last-child { padding-bottom: 0; border-bottom: 0; }
.entity-panel dt { color: var(--muted); font-weight: 700; }
.entity-panel dd { margin: 0; font-weight: 750; }
.topic-directory { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.topic-group { border-top: 3px solid var(--brand); background: #fff; padding: 24px; }
.topic-group h2 { margin: 0 0 8px; font-size: 22px; }
.topic-group p { margin: 0; color: var(--muted); }
.topic-group ul { margin: 18px 0 0; padding: 15px 0 0; border-top: 1px solid var(--line); list-style: none; }
.topic-group li + li { margin-top: 8px; }
.plain-section { margin-top: 38px; border-top: 1px solid var(--line); padding-top: 24px; }
.plain-section h2 { margin: 0 0 14px; }
.inline-links { display: flex; flex-wrap: wrap; gap: 10px 18px; }
.reading-steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); margin-bottom: 34px; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.reading-steps > div { border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 20px; }
.reading-steps strong, .reading-steps span { display: block; }
.reading-steps strong { margin-bottom: 5px; font-size: 19px; }
.reading-steps span { color: var(--muted); }
.search-form { display: grid; grid-template-columns: 1fr auto; gap: 10px; margin: 0 0 20px; }
.search-form input { min-width: 0; border: 1px solid #aeb8b9; border-radius: 3px; background: #fff; padding: 11px 13px; }
.search-status { min-height: 30px; color: var(--muted); }
.unavailable-page { grid-column: 1 / -1; max-width: 760px; margin: 28px auto 40px; }
.unavailable-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 18px; margin-top: 26px; padding-top: 24px; border-top: 1px solid var(--line); }
.not-found { max-width: 760px; margin: 34px auto 20px; border-top: 4px solid var(--brand); background: #fff; padding: clamp(32px, 6vw, 64px); }
.not-found h1 { margin: 0; font-size: clamp(32px, 5vw, 48px); line-height: 1.25; }
.not-found > p:not(.section-label) { color: var(--muted); }

.site-footer { border-top: 4px solid var(--brand); background: #242c31; color: #dbe0e2; }
.footer-inner { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; gap: 40px; padding: 38px 0; }
.footer-brand { color: #fff; font-size: 20px; font-weight: 850; }
.footer-inner p { margin: 7px 0 0; color: #b8c0c4; }
.footer-links { display: flex; justify-content: flex-end; align-items: flex-start; gap: 10px 16px; flex-wrap: wrap; }
.footer-links a { color: #e2e7e9; }
.footer-bottom { display: flex; justify-content: center; gap: 8px 16px; flex-wrap: wrap; border-top: 1px solid rgba(255,255,255,.12); padding: 16px 20px; color: #abb5ba; font-size: 13px; }
.footer-bottom a { color: #d7dddf; }

@media (max-width: 980px) {
  .home-intro-inner { grid-template-columns: 1fr; gap: 34px; }
  .home-start { max-width: 720px; }
  .card-grid, .topic-directory { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .category-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .article-layout { grid-template-columns: 1fr; }
  .side-panel { position: static; grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .main-nav { position: absolute; top: 69px; left: 0; right: 0; display: none; flex-direction: column; align-items: stretch; border-bottom: 1px solid var(--line); background: #fff; padding: 12px 20px 18px; }
  .main-nav[data-open="true"] { display: flex; }
  .main-nav a { padding: 10px 12px; border-bottom: 0; border-left: 2px solid transparent; }
  .main-nav a:hover, .main-nav a[aria-current="page"] { border-left-color: var(--brand); }
  .menu-toggle { display: inline-flex; }
  .home-links { grid-template-columns: 1fr; gap: 22px; }
}

@media (max-width: 680px) {
  .header-inner, .page-shell, .section-inner, .home-intro-inner, .footer-inner { width: min(100% - 28px, var(--max)); }
  .header-inner { min-height: 64px; }
  .main-nav { top: 63px; }
  .home-intro { padding: 42px 0 38px; }
  .home-intro h1 { font-size: 36px; line-height: 1.24; }
  .home-intro-copy > p:not(.section-label) { font-size: 16px; }
  .home-start { padding-left: 18px; }
  .home-section { padding: 42px 0; }
  .section-heading { align-items: flex-start; flex-direction: column; gap: 8px; }
  .card-grid, .category-list, .topic-directory, .reading-steps, .side-panel, .footer-inner, .about-grid { grid-template-columns: 1fr; }
  .category-list, .reading-steps { border-left: 0; }
  .category-item, .reading-steps > div { border-left: 1px solid var(--line); }
  .about-grid > div { border-right: 0; border-bottom: 1px solid var(--line); padding: 24px; }
  .about-grid > div:nth-last-child(-n+2) { border-bottom: 1px solid var(--line); }
  .about-grid > div:last-child { border-bottom: 0; }
  .home-links li { grid-template-columns: 1fr; gap: 3px; }
  .article { padding: 26px 20px; }
  .article h1 { font-size: 31px; }
  .article .lede { font-size: 17px; }
  .article-section h2 { font-size: 22px; }
  .page-hero { padding: 22px 0 25px; }
  .page-hero h1 { font-size: 33px; }
  .list-row { grid-template-columns: 1fr; gap: 9px; }
  .row-link { white-space: normal; }
  .service-list section, .entity-panel dl > div { grid-template-columns: 1fr; gap: 5px; }
  .search-form { grid-template-columns: 1fr; }
  .footer-links { justify-content: flex-start; }
  .footer-bottom { justify-content: flex-start; }
}