:root {
  color-scheme: light;
  --ink: #203036;
  --muted: #5c6b6e;
  --paper: #f8f6f1;
  --white: #fff;
  --line: #d9dedb;
  --accent: #986047;
  --accent-dark: #75472f;
  --soft: #edf1ef;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 16px/1.75 -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif; }
a { color: inherit; text-underline-offset: .2em; }
a:hover { color: var(--accent-dark); }
button { font: inherit; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
.skip-link { position: absolute; top: -80px; left: 12px; z-index: 30; padding: 8px 12px; background: var(--white); }
.skip-link:focus { top: 12px; }
.container { width: min(1120px, calc(100% - 48px)); margin-inline: auto; }
.site-header { position: relative; z-index: 10; background: var(--white); border-bottom: 1px solid var(--line); }
.header-inner { min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: inline-flex; flex-direction: column; text-decoration: none; line-height: 1.05; min-width: 128px; }
.brand-name { font-size: 24px; font-weight: 800; letter-spacing: .1em; }
.brand-note { margin-top: 7px; color: var(--muted); font-size: 10px; letter-spacing: .23em; }
.site-nav { display: flex; align-items: center; gap: clamp(12px, 2vw, 28px); }
.site-nav a { font-size: 14px; font-weight: 600; text-decoration: none; white-space: nowrap; }
.site-nav a[aria-current="page"] { color: var(--accent-dark); border-bottom: 2px solid var(--accent); }
.nav-toggle { display: none; padding: 8px 12px; color: var(--ink); background: var(--white); border: 1px solid var(--line); border-radius: 4px; }
.eyebrow { margin: 0 0 14px; color: var(--accent-dark); font-size: 12px; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
.operator-name { margin: 0 0 10px; font-size: clamp(16px, 2vw, 20px); font-weight: 700; }
.hero { padding: clamp(70px, 11vw, 150px) 0 90px; border-bottom: 1px solid var(--line); }
.hero-inner { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(230px, .6fr); align-items: end; gap: 70px; }
.hero h1 { max-width: 800px; margin: 0; font-size: clamp(44px, 6.1vw, 78px); line-height: 1.15; letter-spacing: -.045em; }
.hero .lead { max-width: 700px; margin: 30px 0 0; color: var(--muted); font-size: clamp(17px, 2vw, 20px); }
.hero-aside { padding-left: 24px; border-left: 2px solid var(--accent); }
.hero-aside strong { display: block; font-size: 18px; }
.hero-aside p { margin: 8px 0 0; color: var(--muted); font-size: 14px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button { display: inline-block; padding: 11px 22px; border: 1px solid var(--ink); border-radius: 3px; background: var(--ink); color: var(--white); font-size: 14px; font-weight: 700; text-decoration: none; transition: background .15s, color .15s; }
.button:hover { background: var(--accent-dark); border-color: var(--accent-dark); color: var(--white); }
.button.secondary { background: transparent; color: var(--ink); }
.button.secondary:hover { background: var(--ink); color: var(--white); }
.section { padding: 76px 0; }
.section-tight { padding: 48px 0; }
.section-alt { background: var(--white); }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 30px; }
h2 { margin: 0; font-size: clamp(27px, 3.2vw, 38px); line-height: 1.3; letter-spacing: -.02em; }
h3 { margin: 0; font-size: 21px; line-height: 1.4; }
p { margin-top: 0; }
.section-intro { max-width: 690px; color: var(--muted); }
.text-link { color: var(--accent-dark); font-size: 14px; font-weight: 700; }
.card-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.card { min-height: 260px; display: flex; flex-direction: column; padding: 28px; background: var(--white); border: 1px solid var(--line); border-radius: 4px; text-decoration: none; transition: transform .15s, border-color .15s; }
.card:hover { transform: translateY(-3px); border-color: var(--accent); color: var(--ink); }
.card-index { margin-bottom: 28px; color: var(--accent-dark); font-size: 12px; font-weight: 800; letter-spacing: .15em; }
.card h3 { margin-bottom: 10px; }
.card p { color: var(--muted); font-size: 14px; }
.card-more { margin-top: auto; color: var(--accent-dark); font-size: 13px; font-weight: 800; }
.detail-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 15px; }
.detail-list > div { padding: 23px; border-top: 2px solid var(--ink); }
.detail-list strong { display: block; margin-bottom: 7px; }
.detail-list p { margin: 0; color: var(--muted); font-size: 14px; }
.notice { padding: 24px 28px; background: var(--soft); border-left: 3px solid var(--accent); }
.notice p:last-child { margin-bottom: 0; }
.page-hero { padding: 68px 0 58px; border-bottom: 1px solid var(--line); }
.page-hero h1 { margin: 0; font-size: clamp(36px, 4.8vw, 58px); line-height: 1.18; }
.page-hero p:last-child { max-width: 740px; margin: 18px 0 0; color: var(--muted); font-size: 18px; }
.article-stack { display: grid; gap: 20px; }
.article { padding: clamp(25px, 4vw, 48px); background: var(--white); border: 1px solid var(--line); border-radius: 4px; scroll-margin-top: 24px; }
.article-head { display: flex; justify-content: space-between; align-items: start; gap: 20px; margin-bottom: 24px; }
.article-number { color: var(--accent-dark); font-size: 13px; font-weight: 800; white-space: nowrap; }
.article .summary { max-width: 760px; color: var(--muted); font-size: 17px; }
.meta { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 25px; padding: 0; list-style: none; }
.meta li { padding: 4px 11px; background: var(--soft); color: var(--ink); border-radius: 2px; font-size: 12px; }
.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; padding: 24px 0 0; border-top: 1px solid var(--line); }
.steps h4 { margin: 0 0 8px; font-size: 15px; }
.steps p { margin: 0; color: var(--muted); font-size: 14px; }
.article-note { margin: 23px 0 0; color: var(--muted); font-size: 13px; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.panel { padding: 30px; background: var(--white); border: 1px solid var(--line); }
.panel h3 { margin-bottom: 12px; }
.panel p:last-child { margin-bottom: 0; }
.content-narrow { max-width: 850px; }
.prose { padding: 55px 0 85px; }
.prose h2 { margin: 42px 0 13px; font-size: 23px; }
.prose h3 { margin: 28px 0 10px; font-size: 17px; }
.prose p, .prose li { color: #3d4c50; }
.prose ul, .prose ol { padding-left: 1.5em; }
.prose .intro { font-size: 18px; }
.prose .date { color: var(--muted); font-size: 13px; }
.toc { padding: 20px 25px; background: var(--white); border: 1px solid var(--line); }
.toc strong { display: block; margin-bottom: 7px; }
.toc ol { margin: 0; columns: 2; }
.site-footer { padding: 54px 0 28px; background: var(--ink); color: #e8eeeb; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 45px; }
.site-footer .brand { color: var(--white); }
.site-footer .brand-note, .site-footer p { color: #bed0ce; }
.site-footer p, .site-footer a { font-size: 13px; }
.site-footer a:hover { color: var(--white); }
.footer-heading { margin: 0 0 12px; color: var(--white); font-size: 14px; font-weight: 700; }
.footer-links { display: grid; gap: 7px; }
.footer-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; margin-top: 42px; padding-top: 18px; border-top: 1px solid #506064; font-size: 12px; }
.footer-bottom a { color: #e8eeeb; }

@media (max-width: 800px) {
  .nav-toggle { display: inline-block; }
  .site-nav { display: none; position: absolute; top: 100%; left: 0; right: 0; padding: 15px 24px 22px; background: var(--white); border-bottom: 1px solid var(--line); box-shadow: 0 12px 20px #20303614; }
  .site-nav.is-open { display: grid; gap: 0; }
  .site-nav a { padding: 9px 0; }
  .hero-inner { grid-template-columns: 1fr; gap: 35px; }
  .card-grid, .steps, .detail-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .container { width: min(100% - 32px, 1120px); }
  .header-inner { min-height: 70px; }
  .brand-name { font-size: 21px; }
  .hero { padding: 70px 0; }
  .hero h1 { font-size: 42px; }
  .section { padding: 56px 0; }
  .section-heading { align-items: start; flex-direction: column; }
  .card-grid, .steps, .detail-list, .two-col, .footer-grid { grid-template-columns: 1fr; }
  .card { min-height: 225px; }
  .article-head { flex-direction: column-reverse; gap: 10px; }
  .toc ol { columns: 1; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .button, .card { transition: none; }
}