:root {
  --navy: #073553;
  --blue: #126782;
  --orange: #e85f00;
  --ink: #172033;
  --text: #344054;
  --muted: #667085;
  --line: #dce3ea;
  --soft: #f4f7f9;
  --paper: #ffffff;
  --container: 1120px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei UI", system-ui, sans-serif;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--blue); text-underline-offset: 3px; }
a:hover { color: var(--orange); }
a:focus-visible { outline: 3px solid var(--orange); outline-offset: 3px; }
img { display: block; max-width: 100%; }
.container { width: min(calc(100% - 36px), var(--container)); margin-inline: auto; }
.skip-link { position: fixed; top: 10px; left: 10px; z-index: 100; padding: 9px 13px; color: #fff; background: var(--navy); transform: translateY(-160%); }
.skip-link:focus { transform: none; }

.site-header { position: sticky; top: 0; z-index: 20; border-bottom: 1px solid var(--line); background: rgba(255,255,255,.96); backdrop-filter: blur(10px); }
.nav { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--navy); font-weight: 900; text-decoration: none; }
.brand img { width: 38px; height: 38px; }
.nav-links { display: flex; align-items: center; flex-wrap: wrap; gap: 10px 18px; font-size: 14px; font-weight: 800; }
.nav-links a { color: var(--navy); text-decoration: none; }
.nav-links .contact-link { padding: 8px 13px; color: #fff; background: var(--navy); }

.breadcrumb { padding-top: 24px; color: var(--muted); font-size: 14px; }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: 7px; margin: 0; padding: 0; list-style: none; }
.hero { padding: clamp(42px, 7vw, 84px) 0 52px; border-bottom: 1px solid var(--line); background: linear-gradient(115deg, #fff 0 64%, var(--soft) 64%); }
.kicker { margin: 0 0 12px; color: var(--orange); font-size: 14px; font-weight: 900; letter-spacing: .08em; }
h1 { max-width: 980px; margin: 0; color: var(--navy); font-size: clamp(34px, 5.2vw, 64px); line-height: 1.08; letter-spacing: -.035em; text-wrap: balance; }
.answer { max-width: 850px; margin: 24px 0 0; padding-left: 18px; border-left: 5px solid var(--orange); color: var(--text); font-size: clamp(18px, 2.1vw, 22px); text-wrap: pretty; }
.answer strong { color: var(--navy); }
.quick-links { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }
.quick-links a { padding: 9px 13px; border: 1px solid var(--line); color: var(--navy); background: #fff; font-weight: 800; text-decoration: none; }

.section { padding: clamp(48px, 7vw, 82px) 0; }
.section.soft { background: var(--soft); }
.section.dark { color: #fff; background: var(--navy); }
.section.dark h2, .section.dark h3, .section.dark a { color: #fff; }
.section.dark .muted { color: #d9e5ec; }
.section-head { display: grid; grid-template-columns: minmax(220px, .7fr) minmax(0, 1.3fr); gap: 36px; align-items: start; margin-bottom: 34px; }
h2 { margin: 0; color: var(--navy); font-size: clamp(28px, 4vw, 44px); line-height: 1.18; letter-spacing: -.025em; text-wrap: balance; }
.section-head p { margin: 5px 0 0; color: var(--text); font-size: 17px; }
h3 { margin: 0 0 8px; color: var(--navy); font-size: 20px; line-height: 1.35; }
p { text-wrap: pretty; }
.muted { color: var(--muted); }

.fact-list { margin: 0; border-top: 1px solid var(--line); }
.fact-row { display: grid; grid-template-columns: minmax(150px, .42fr) minmax(0, 1.58fr); gap: 24px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.fact-row dt { color: var(--navy); font-weight: 900; }
.fact-row dd { margin: 0; color: var(--text); }
.fact-row code { overflow-wrap: anywhere; }

.split { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 42px; }
.rule-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.rule-list li { position: relative; padding: 17px 0 17px 34px; border-bottom: 1px solid var(--line); }
.rule-list li::before { position: absolute; left: 0; top: 17px; color: var(--orange); font-weight: 900; content: "✓"; }
.number-list { margin: 0; padding: 0; list-style: none; counter-reset: steps; }
.number-list li { position: relative; min-height: 60px; padding: 0 0 26px 66px; counter-increment: steps; }
.number-list li::before { position: absolute; left: 0; top: 0; width: 46px; height: 46px; display: grid; place-items: center; color: #fff; background: var(--navy); font-weight: 900; content: counter(steps, decimal-leading-zero); }
.number-list li + li::after { position: absolute; left: 22px; top: -26px; width: 1px; height: 26px; background: var(--line); content: ""; }

.comparison { width: 100%; border-collapse: collapse; border-top: 2px solid var(--navy); }
.comparison th, .comparison td { padding: 14px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.comparison th { color: var(--navy); background: var(--soft); font-size: 14px; }
.comparison td:first-child { color: var(--navy); font-weight: 850; }

.link-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.link-block { min-height: 170px; padding: 24px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); color: inherit; text-decoration: none; }
.link-block:hover { color: inherit; background: var(--soft); }
.link-block p { margin: 0; color: var(--muted); }
.link-block .label { display: block; margin-top: 20px; color: var(--orange); font-size: 13px; font-weight: 900; }
.article-list { margin: 0; padding: 0; list-style: none; border-top: 2px solid var(--navy); }
.article-list li { border-bottom: 1px solid var(--line); }
.article-list a { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 18px; padding: 19px 4px; color: var(--navy); font-weight: 850; text-decoration: none; }
.article-list a:hover { background: var(--soft); }
.article-list time { color: var(--muted); font-size: 13px; font-weight: 650; }

.faq { border-top: 2px solid var(--navy); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { padding: 20px 38px 20px 0; color: var(--navy); font-size: 18px; font-weight: 900; cursor: pointer; }
.faq p { max-width: 850px; margin: -3px 0 22px; color: var(--text); }

.contact-panel { display: grid; grid-template-columns: .75fr 1.25fr; gap: 44px; align-items: start; }
.contact-panel address { font-style: normal; }
.contact-lines { display: grid; gap: 10px; }
.contact-lines code { padding: 2px 5px; color: var(--navy); background: var(--soft); }
.notice { padding: 16px 18px; border-left: 4px solid var(--orange); background: #fff7ef; color: #713800; }
.site-footer { padding: 30px 0 40px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.footer-grid { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }

@media (max-width: 860px) {
  .nav { align-items: flex-start; padding: 14px 0; }
  .nav-links { justify-content: flex-end; }
  .nav-links a:not(.contact-link) { display: none; }
  .hero { background: linear-gradient(#fff, var(--soft)); }
  .section-head, .split, .contact-panel { grid-template-columns: 1fr; gap: 24px; }
  .fact-row { grid-template-columns: 1fr; gap: 5px; }
  .link-grid { grid-template-columns: 1fr; }
  .comparison { display: block; overflow-x: auto; white-space: normal; }
  .article-list a { grid-template-columns: 1fr; gap: 4px; }
}

@media (max-width: 520px) {
  .brand span { max-width: 150px; line-height: 1.2; }
  h1 { font-size: 36px; }
  .container { width: min(calc(100% - 28px), var(--container)); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}