:root {
  --ink: #183432;
  --muted: #61716d;
  --brand: #347c7a;
  --line: #dfe8e3;
  --wash: #f4f7f4;
  --paper: #ffffff;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Noto Serif SC", "Songti SC", SimSun, serif;
  line-height: 1.85;
}
a { color: var(--brand); }
img { max-width: 100%; height: auto; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(223, 232, 227, .88);
  background: rgba(255, 255, 255, .94);
  backdrop-filter: blur(12px);
}
.site-header-inner {
  width: min(1080px, calc(100% - 36px));
  min-height: 68px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand { color: var(--ink); font-size: 18px; text-decoration: none; letter-spacing: 1px; }
.header-nav { display: flex; flex-wrap: wrap; gap: 16px; font-size: 13px; }
.header-nav a { color: var(--muted); text-decoration: none; }
.hero { background: linear-gradient(140deg, #ecf3ee 0%, #f9f7f0 100%); }
.hero-inner, .content, .site-footer-inner {
  width: min(920px, calc(100% - 36px));
  margin: 0 auto;
}
.hero-inner { padding: 78px 0 66px; }
.eyebrow { margin: 0 0 14px; color: var(--brand); font: 12px/1.4 Arial, sans-serif; letter-spacing: 3px; text-transform: uppercase; }
h1 { max-width: 820px; margin: 0; font-size: clamp(34px, 6vw, 58px); font-weight: 500; line-height: 1.35; letter-spacing: 1px; }
.dek { max-width: 790px; margin: 22px 0 0; color: var(--muted); font-size: 17px; }
.updated { margin: 18px 0 0; color: #81908b; font: 12px/1.5 Arial, sans-serif; }
.content { padding: 58px 0 88px; }
.answer-box, .notice {
  margin: 0 0 38px;
  padding: 24px 26px;
  border-left: 4px solid var(--brand);
  background: var(--wash);
}
.answer-box strong { display: block; margin-bottom: 7px; }
h2 { margin: 52px 0 18px; font-size: 29px; font-weight: 500; line-height: 1.45; }
h3 { margin: 32px 0 12px; font-size: 20px; font-weight: 500; }
p { margin: 0 0 18px; }
ul, ol { margin: 0 0 22px; padding-left: 1.3em; }
li + li { margin-top: 8px; }
.facts, .cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 24px 0 36px;
}
.fact, .card { padding: 21px; border: 1px solid var(--line); background: #fff; }
.fact dt { color: #82908b; font: 12px/1.5 Arial, sans-serif; letter-spacing: 1px; }
.fact dd { margin: 8px 0 0; }
.card { color: var(--ink); text-decoration: none; }
.card strong { display: block; margin-bottom: 7px; }
.card span { color: var(--muted); font-size: 14px; }
.system-list { counter-reset: system; list-style: none; padding: 0; }
.system-list li { position: relative; padding: 21px 20px 21px 68px; border-top: 1px solid var(--line); }
.system-list li:last-child { border-bottom: 1px solid var(--line); }
.system-list li::before {
  counter-increment: system;
  content: counter(system, decimal-leading-zero);
  position: absolute;
  left: 17px;
  top: 22px;
  color: var(--brand);
  font: 15px/1.4 Arial, sans-serif;
}
.system-list strong { display: block; margin-bottom: 4px; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; margin: 22px 0 34px; }
th, td { padding: 14px 16px; border: 1px solid var(--line); text-align: left; vertical-align: top; }
th { background: var(--wash); font-weight: 500; }
.faq details { border-top: 1px solid var(--line); }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { padding: 18px 3px; cursor: pointer; font-weight: 500; }
.faq details p { padding: 0 3px 18px; color: var(--muted); }
.cta { margin-top: 52px; padding: 30px; background: var(--ink); color: #fff; }
.cta a { color: #fff; }
.site-footer { border-top: 1px solid var(--line); background: var(--wash); }
.site-footer-inner { padding: 34px 0; color: var(--muted); font-size: 13px; }
.site-footer-inner p { margin: 5px 0; }
.crumbs { margin-bottom: 24px; color: #82908b; font-size: 13px; }
.crumbs a { color: #687873; text-decoration: none; }
@media (max-width: 680px) {
  .site-header-inner { align-items: flex-start; flex-direction: column; padding: 14px 0; }
  .header-nav { gap: 10px 14px; }
  .hero-inner { padding: 56px 0 48px; }
  .content { padding-top: 42px; }
  .facts, .cards { grid-template-columns: 1fr; }
}