:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #5f6b7c;
  --line: #dbe3ee;
  --paper: #ffffff;
  --wash: #f4f7fb;
  --brand: #1558d6;
  --brand-soft: #eaf1ff;
  --accent: #0c8f6a;
  --shadow: 0 18px 55px rgba(30, 54, 92, 0.10);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% 0%, #e9f1ff 0, transparent 35rem),
    linear-gradient(180deg, #f8faff 0%, var(--wash) 100%);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.72;
}

a { color: var(--brand); }
a:hover { text-decoration-thickness: 2px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(219, 227, 238, 0.9);
  background: rgba(248, 250, 255, 0.88);
  backdrop-filter: blur(18px);
}

.nav {
  width: min(1040px, calc(100% - 40px));
  min-height: 68px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  color: var(--ink);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 760;
  letter-spacing: -0.02em;
}

.brand-mark {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  color: white;
  background: linear-gradient(145deg, #1f6df2, #0c8f6a);
  box-shadow: 0 7px 18px rgba(21, 88, 214, 0.24);
  font-size: 16px;
}

.nav-links { display: flex; align-items: center; gap: 20px; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: 14px; font-weight: 600; }
.nav-links a:hover { color: var(--brand); }

.hero {
  width: min(920px, calc(100% - 40px));
  margin: 0 auto;
  padding: 92px 0 54px;
  text-align: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  padding: 7px 12px;
  border: 1px solid #cfe0ff;
  border-radius: 999px;
  color: #174ea6;
  background: var(--brand-soft);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.hero h1 {
  margin: 0;
  font-size: clamp(40px, 7vw, 68px);
  line-height: 1.05;
  letter-spacing: -0.055em;
}

.hero p {
  max-width: 650px;
  margin: 22px auto 0;
  color: var(--muted);
  font-size: clamp(17px, 2.2vw, 21px);
}

.actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; margin-top: 32px; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--ink);
  background: var(--paper);
  text-decoration: none;
  font-size: 15px;
  font-weight: 700;
  box-shadow: 0 5px 18px rgba(30, 54, 92, 0.06);
}

.button.primary { border-color: var(--brand); color: #fff; background: var(--brand); }

.card-grid {
  width: min(1040px, calc(100% - 40px));
  margin: 18px auto 84px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.card {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: 0 10px 34px rgba(30, 54, 92, 0.05);
}

.card h2, .card h3 { margin: 0 0 10px; font-size: 18px; letter-spacing: -0.02em; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.card-icon { margin-bottom: 16px; font-size: 26px; }

.document-shell {
  width: min(920px, calc(100% - 40px));
  margin: 40px auto 80px;
  padding: clamp(26px, 5vw, 58px);
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.document-header { padding-bottom: 28px; border-bottom: 1px solid var(--line); }
.document-header h1 { margin: 0 0 10px; font-size: clamp(32px, 5vw, 48px); line-height: 1.15; letter-spacing: -0.04em; }
.document-header p { margin: 0; color: var(--muted); }

.notice {
  margin: 26px 0;
  padding: 16px 18px;
  border: 1px solid #cfe0ff;
  border-radius: 14px;
  color: #174ea6;
  background: #f3f7ff;
}

.toc {
  margin: 28px 0;
  padding: 18px 22px;
  border-radius: 14px;
  background: var(--wash);
}

.toc strong { display: block; margin-bottom: 8px; }
.toc ol { margin: 0; padding-left: 20px; columns: 2; column-gap: 38px; }
.toc li { margin: 3px 0; break-inside: avoid; }

.document h2 { margin: 38px 0 12px; font-size: 24px; line-height: 1.3; letter-spacing: -0.025em; scroll-margin-top: 90px; }
.document h3 { margin: 24px 0 8px; font-size: 18px; }
.document p, .document li { color: #344054; }
.document ul, .document ol { padding-left: 24px; }
.document li { margin: 7px 0; }

.summary-list { display: grid; gap: 10px; margin: 22px 0; }
.summary-item { display: flex; gap: 12px; padding: 13px 15px; border-radius: 12px; background: var(--wash); }
.summary-item b { color: var(--accent); }

table { width: 100%; margin: 18px 0; border-collapse: collapse; font-size: 15px; }
th, td { padding: 12px 14px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { background: var(--wash); font-size: 14px; }

.contact-box { margin-top: 28px; padding: 22px; border-radius: 16px; background: #f3f7ff; border: 1px solid #cfe0ff; }
.contact-box p { margin: 6px 0; }

.faq { margin: 30px 0; }
.faq details { border-bottom: 1px solid var(--line); padding: 17px 0; }
.faq summary { cursor: pointer; font-weight: 700; }
.faq details p { margin: 12px 0 0; }

.site-footer {
  width: min(1040px, calc(100% - 40px));
  margin: 0 auto;
  padding: 28px 0 42px;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

.site-footer p { margin: 0; }
.footer-links { display: flex; flex-wrap: wrap; gap: 16px; }
.footer-links a { color: var(--muted); text-decoration: none; }

@media (max-width: 760px) {
  .nav { width: min(100% - 28px, 1040px); }
  .nav-links a:first-child { display: none; }
  .hero { padding-top: 64px; }
  .card-grid { grid-template-columns: 1fr; }
  .toc ol { columns: 1; }
  .site-footer { flex-direction: column; }
  .document-shell { width: min(100% - 24px, 920px); border-radius: 18px; }
  th, td { padding: 10px 8px; }
}