:root {
  --ink: #111719;
  --paper: #f4f6f5;
  --white: #fff;
  --steel: #5f8991;
  --steel-dark: #18292e;
  --mist: #e3e9e8;
  --line: rgba(17, 23, 25, .16);
  --muted: #586467;
  --page: min(1280px, calc(100% - 96px));
  --ease: cubic-bezier(.22, 1, .36, 1);
}

* { box-sizing: border-box; letter-spacing: 0; }
html { scroll-behavior: smooth; color-scheme: light; }
body { margin: 0; overflow-x: hidden; background: var(--paper); color: var(--ink); font-family: "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif; font-size: 16px; line-height: 1.75; }
button, input, textarea, select { font: inherit; }
a { color: inherit; }
img { display: block; width: 100%; }
:focus-visible { outline: 3px solid #79a6ae; outline-offset: 4px; }
.skip-link { position: fixed; top: 12px; left: 16px; z-index: 100; padding: 9px 14px; background: var(--white); transform: translateY(-160%); }
.skip-link:focus { transform: none; }
.page-width { width: var(--page); margin-inline: auto; }

.nav-header { position: fixed; inset: 0 0 auto; z-index: 50; border-bottom: 1px solid var(--line); background: rgba(244, 246, 245, .92); color: var(--ink); backdrop-filter: blur(16px) saturate(120%); }
.nav-inner { width: var(--page); min-height: 72px; display: flex; align-items: center; margin-inline: auto; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-symbol { width: 38px; height: 38px; display: grid; position: relative; place-items: center; border: 1px solid currentColor; font-size: 14px; font-weight: 900; }
.brand-symbol i { width: 7px; height: 7px; position: absolute; right: -4px; bottom: -4px; background: #7fa5ab; }
.brand-name { font-size: 18px; font-weight: 800; }
.nav-inner nav { display: flex; gap: 34px; margin-left: auto; }
.nav-inner nav a, .nav-action { position: relative; font-size: 15px; font-weight: 600; text-decoration: none; }
.nav-inner nav a[aria-current="page"]::after { content: ""; position: absolute; right: 0; bottom: -11px; left: 0; height: 2px; background: var(--steel); }
.nav-action { margin-left: 34px; padding-left: 28px; border-left: 1px solid var(--line); }
.nav-action span { margin-left: 8px; color: var(--steel); }
.menu-button, .mobile-menu { display: none; }

.page-main { padding-top: 72px; }
.page-hero { min-height: 520px; display: grid; position: relative; align-items: end; overflow: hidden; background: var(--steel-dark); color: var(--white); }
.page-hero::before { content: ""; position: absolute; inset: 0; opacity: .18; background-image: linear-gradient(rgba(255,255,255,.28) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.28) 1px, transparent 1px); background-size: 80px 80px; mask-image: linear-gradient(to right, transparent, #000); }
.page-hero-inner { position: relative; z-index: 1; padding-block: 112px 78px; }
.eyebrow { margin: 0 0 22px; color: #bed3d6; font-size: 15px; font-weight: 700; }
.page-hero h1 { max-width: 950px; margin: 0; font-size: clamp(48px, 6vw, 88px); line-height: 1.08; text-wrap: balance; }
.page-hero p:last-child { max-width: 760px; margin: 34px 0 0; color: #dbe5e5; font-size: 19px; line-height: 1.9; }

.section { padding-block: 112px; }
.section + .section { border-top: 1px solid var(--line); }
.section-intro { display: grid; grid-template-columns: minmax(0, .9fr) minmax(320px, .55fr); gap: 80px; align-items: start; margin-bottom: 72px; }
.section-intro h2 { max-width: 760px; margin: 0; font-size: 48px; line-height: 1.22; text-wrap: balance; }
.section-intro p { margin: 6px 0 0; color: var(--muted); font-size: 17px; }

.service-detail { display: grid; grid-template-columns: minmax(220px, .4fr) minmax(0, 1fr); border-top: 1px solid var(--line); }
.service-detail > header { position: sticky; top: 108px; align-self: start; padding: 42px 48px 48px 0; }
.service-detail > header span { color: var(--steel); font-size: 15px; font-weight: 700; }
.service-detail > header h2 { margin: 14px 0 20px; font-size: 34px; line-height: 1.3; }
.service-detail > header p { margin: 0; color: var(--muted); }
.service-detail > header a { width:max-content; display:inline-flex; gap:8px; align-items:center; margin-top:24px; padding-bottom:5px; border-bottom:1px solid var(--line); font-weight:700; text-decoration:none; }
.service-detail > header a b { color:var(--steel); font-weight:400; }
.service-detail-body { border-left: 1px solid var(--line); }
.service-summary { min-height: 340px; display: grid; grid-template-columns: minmax(0, 1fr) minmax(280px, .8fr); gap: 56px; align-items: end; padding: 48px 0 48px 56px; }
.service-summary p { margin: 0; font-size: 26px; font-weight: 600; line-height: 1.65; }
.service-summary img { height: 260px; object-fit: cover; filter: saturate(.78) contrast(1.02); }
.service-columns { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); }
.service-columns section { min-height: 310px; padding: 38px 32px 44px; }
.service-columns section + section { border-left: 1px solid var(--line); }
.service-columns h3 { margin: 0 0 24px; font-size: 19px; }
.service-columns ul { margin: 0; padding: 0; list-style: none; }
.service-columns li { position: relative; padding: 12px 0 12px 18px; border-top: 1px solid var(--line); color: var(--muted); }
.service-columns li::before { content: ""; width: 6px; height: 6px; position: absolute; top: 24px; left: 0; background: var(--steel); }
.service-boundary { margin: 0; padding: 26px 56px; border-top: 1px solid var(--line); background: var(--mist); font-size: 15px; }

.updates-toolbar { display: flex; align-items: end; justify-content: space-between; margin-bottom: 48px; }
.filter-list { display: flex; gap: 8px; flex-wrap: wrap; }
.filter-list button { min-height: 44px; padding: 8px 18px; border: 1px solid var(--line); border-radius: 0; background: transparent; color: var(--muted); cursor: pointer; }
.filter-list button.active { border-color: var(--steel-dark); background: var(--steel-dark); color: var(--white); }
.updates-list { border-top: 1px solid var(--line); }
.update-row { display: grid; grid-template-columns: 180px minmax(0, 1fr) 32px; gap: 44px; align-items: center; min-height: 190px; padding-block: 28px; border-bottom: 1px solid var(--line); text-decoration: none; transition: padding .35s var(--ease), background .35s var(--ease); }
.update-row:hover { padding-inline: 22px; background: var(--white); }
.update-row img { width: 180px; height: 128px; object-fit: cover; filter: saturate(.75); }
.update-row span { color: var(--steel); font-size: 14px; font-weight: 700; }
.update-row h2 { margin: 8px 0 10px; font-size: 28px; line-height: 1.35; }
.update-row p { margin: 0; color: var(--muted); }
.update-row b { font-size: 24px; font-weight: 400; transition: transform .3s var(--ease); }
.update-row:hover b { transform: translateX(6px); }
.empty-state { padding: 72px 0; color: var(--muted); text-align: center; }

.facts { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--line); }
.fact { min-height: 130px; padding: 28px 0; border-bottom: 1px solid var(--line); }
.fact:nth-child(odd) { padding-right: 42px; }
.fact:nth-child(even) { padding-left: 42px; border-left: 1px solid var(--line); }
.fact span { display: block; margin-bottom: 10px; color: var(--muted); font-size: 14px; }
.fact strong { font-size: 20px; overflow-wrap: anywhere; }
.principles { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); }
.principles article { min-height: 260px; padding: 38px 38px 50px 0; }
.principles article + article { padding-left: 38px; border-left: 1px solid var(--line); }
.principles h3 { margin: 0 0 24px; font-size: 24px; }
.principles p { margin: 0; color: var(--muted); }

.contact-grid { display: grid; grid-template-columns: minmax(0, .9fr) minmax(380px, .7fr); gap: 96px; }
.contact-lines { border-top: 1px solid var(--line); }
.contact-line { display: grid; grid-template-columns: 140px minmax(0, 1fr); gap: 24px; padding-block: 28px; border-bottom: 1px solid var(--line); }
.contact-line span { color: var(--muted); font-size: 14px; }
.contact-line strong, .contact-line a { font-size: 18px; overflow-wrap: anywhere; }
.contact-checklist { padding: 42px; background: var(--steel-dark); color: var(--white); }
.contact-checklist h2 { margin: 0 0 28px; font-size: 28px; }
.contact-checklist ol { margin: 0; padding: 0; list-style: none; counter-reset: item; }
.contact-checklist li { counter-increment: item; display: grid; grid-template-columns: 42px minmax(0, 1fr); gap: 16px; padding: 18px 0; border-top: 1px solid rgba(255,255,255,.18); }
.contact-checklist li::before { content: counter(item); color: #a9c5c9; font-weight: 700; }
.notice { margin-top: 24px; color: var(--muted); font-size: 14px; }

.article-shell { display: grid; grid-template-columns: minmax(0, 760px) minmax(220px, 300px); gap: 96px; align-items: start; padding-block: 100px; }
.article-body h1 { margin: 14px 0 30px; font-size: 52px; line-height: 1.25; }
.article-summary { padding-bottom: 30px; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 20px; }
.article-cover { max-height: 520px; margin: 42px 0; object-fit: cover; }
.article-prose p { margin: 0 0 24px; font-size: 17px; line-height: 2; white-space: pre-line; }
.article-aside { position: sticky; top: 112px; padding-top: 22px; border-top: 1px solid var(--line); }
.article-aside h2 { margin: 0 0 20px; font-size: 18px; }
.article-aside a { display: block; padding: 13px 0; border-bottom: 1px solid var(--line); overflow-wrap: anywhere; }

.detail-page-hero h1 { max-width: 1060px; }
.structured-detail { display: grid; grid-template-columns: minmax(230px, .42fr) minmax(0, 1fr); padding-bottom: 0; }
.structured-detail > header { position: sticky; top: 96px; align-self: start; padding: 38px 48px 72px 0; }
.structured-detail > header > span { color: var(--steel); font-size: 15px; font-weight: 700; }
.structured-detail > header h2 { margin: 14px 0 18px; font-size: 34px; line-height: 1.3; }
.structured-detail > header p { margin: 0; color: var(--muted); }
.structured-detail > header a { display: inline-flex; gap: 8px; align-items: center; margin-top: 28px; padding-bottom: 5px; border-bottom: 1px solid var(--line); font-weight: 700; text-decoration: none; }
.structured-detail > header a b { color: var(--steel); font-weight: 400; }
.structured-detail > header a + a { display:flex; margin-top:14px; }
.structured-detail-body { border-left: 1px solid var(--line); }
.structured-lead { min-height: 380px; display: grid; grid-template-columns: minmax(0, 1.12fr) minmax(300px, .88fr); gap: 56px; align-items: center; padding: 54px 0 54px 58px; }
.structured-lead p { margin: 0; font-size: 28px; font-weight: 650; line-height: 1.65; }
.structured-lead img { height: 300px; object-fit: cover; filter: saturate(.76) contrast(1.03); }
.structured-columns { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); }
.structured-columns section { min-height: 330px; padding: 40px 30px 48px; }
.structured-columns section + section { border-left: 1px solid var(--line); }
.structured-columns h3 { margin: 0 0 26px; font-size: 20px; }
.structured-columns ul { margin: 0; padding: 0; list-style: none; }
.structured-columns li { position: relative; padding: 13px 0 13px 18px; border-top: 1px solid var(--line); color: var(--muted); }
.structured-columns li::before { content: ""; width: 6px; height: 6px; position: absolute; top: 25px; left: 0; background: var(--steel); }
.structured-boundary { margin: 0; padding: 28px 58px; border-top: 1px solid var(--line); background: var(--mist); font-size: 15px; }
.guide-result { display: grid; grid-template-columns: 150px minmax(0, 1fr); gap: 32px; padding: 34px 58px; border-top: 1px solid var(--line); }
.guide-result span { color: var(--steel); font-weight: 700; }
.guide-result p { margin: 0; font-size: 19px; font-weight: 600; }

.footer { padding-block: 64px 28px; background: #0f181a; color: var(--white); }
.footer-main { display: flex; align-items: center; }
.footer-nav { display: flex; gap: 28px; margin-left: auto; }
.footer-nav a { color: #c7d2d2; font-size: 14px; text-decoration: none; }
.footer-bottom { display: flex; gap: 22px; flex-wrap: wrap; margin-top: 48px; padding-top: 24px; border-top: 1px solid rgba(255,255,255,.15); color: #aebcbc; font-size: 14px; }
.footer-bottom a { text-decoration: none; }
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 900px) {
  :root { --page: min(100% - 40px, 720px); }
  .nav-inner { min-height: 64px; }
  .nav-inner nav, .nav-action { display: none; }
  .menu-button { width: 44px; height: 44px; display: grid; margin-left: auto; place-content: center; gap: 7px; border: 0; background: transparent; }
  .menu-button span { width: 23px; height: 2px; background: currentColor; }
  .mobile-menu { display: none; padding: 18px 20px 26px; border-top: 1px solid var(--line); background: var(--paper); }
  .mobile-menu.open { display: grid; }
  .mobile-menu a { padding: 13px 0; border-bottom: 1px solid var(--line); font-weight: 600; text-decoration: none; }
  .page-main { padding-top: 64px; }
  .page-hero { min-height: 460px; }
  .page-hero-inner { padding-block: 90px 56px; }
  .page-hero h1 { font-size: 40px; line-height: 1.14; }
  .page-hero p:last-child { font-size: 17px; }
  .section { padding-block: 78px; }
  .section-intro, .contact-grid, .article-shell { grid-template-columns: 1fr; gap: 42px; }
  .section-intro { margin-bottom: 48px; }
  .section-intro h2 { font-size: 36px; }
  .service-detail { grid-template-columns: 1fr; }
  .service-detail > header { position: static; padding-right: 0; }
  .service-detail-body { border-left: 0; }
  .service-summary { min-height: 0; grid-template-columns: 1fr; padding: 30px 0; }
  .service-summary p { font-size: 22px; }
  .service-summary img { height: 240px; }
  .service-columns { grid-template-columns: 1fr; }
  .service-columns section { min-height: 0; padding-inline: 0; }
  .service-columns section + section { border-top: 1px solid var(--line); border-left: 0; }
  .service-boundary { padding-inline: 20px; }
  .updates-toolbar { display: block; }
  .filter-list { margin-top: 24px; }
  .update-row { grid-template-columns: 112px minmax(0, 1fr); gap: 20px; min-height: 150px; }
  .update-row img { width: 112px; height: 100px; }
  .update-row h2 { font-size: 20px; }
  .update-row p, .update-row b { display: none; }
  .facts, .principles { grid-template-columns: 1fr; }
  .fact:nth-child(n) { padding-inline: 0; border-left: 0; }
  .principles article:nth-child(n) { min-height: 0; padding: 30px 0; border-top: 1px solid var(--line); border-left: 0; }
  .article-shell { padding-block: 70px; }
  .article-body h1 { font-size: 38px; }
  .article-aside { position: static; }
  .structured-detail { grid-template-columns: 1fr; padding-bottom: 0; }
  .structured-detail > header { position: static; padding: 0 0 46px; }
  .structured-detail-body { border-left: 0; }
  .structured-lead { min-height: 0; grid-template-columns: 1fr; gap: 30px; padding: 38px 0; }
  .structured-lead p { font-size: 23px; }
  .structured-lead img { height: 250px; }
  .structured-columns { grid-template-columns: 1fr; }
  .structured-columns section { min-height: 0; padding: 32px 0; }
  .structured-columns section + section { border-top: 1px solid var(--line); border-left: 0; }
  .structured-boundary { padding: 24px 20px; }
  .guide-result { grid-template-columns: 1fr; gap: 10px; padding: 28px 20px; }
  .footer-main { align-items: flex-start; }
  .footer-nav { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px 24px; }
  .footer-bottom { display: block; }
  .footer-bottom span, .footer-bottom a { display: block; margin-top: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}