:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --ink: #18202a;
  --muted: #657386;
  --line: #dce3eb;
  --blue: #2563eb;
  --blue-dark: #173f9a;
  --mint: #0f9f8f;
  --amber: #f59e0b;
  --rose: #e85d75;
  --shadow: 0 20px 54px rgba(24, 32, 42, 0.11);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(220, 227, 235, 0.55) 1px, transparent 1px),
    linear-gradient(180deg, rgba(220, 227, 235, 0.55) 1px, transparent 1px),
    var(--bg);
  background-size: 36px 36px;
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  line-height: 1.68;
}
a { color: inherit; text-decoration: none; }
.shell { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
  min-height: 74px;
  padding: 0 max(20px, calc((100vw - 1180px) / 2));
  background: rgba(245, 247, 251, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}
.mark { display: inline-flex; align-items: center; gap: 10px; font-weight: 900; white-space: nowrap; }
.mark img { width: 34px; height: 34px; object-fit: contain; }
.topbar nav { display: flex; justify-content: center; gap: 28px; color: var(--muted); font-size: 15px; }
.topbar nav a:hover { color: var(--blue); }
.top-cta, .primary, .secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 999px;
  font-weight: 800;
}
.top-cta, .primary { color: #fff; background: var(--blue); box-shadow: 0 14px 34px rgba(37, 99, 235, 0.24); }
.top-cta:hover, .primary:hover { background: var(--blue-dark); }
.secondary { color: var(--blue); background: #fff; border: 1px solid var(--line); }

.hero { padding: 92px 0 64px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(340px, 420px); gap: 38px; align-items: stretch; }
.hero-copy {
  padding: 62px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
}
.eyebrow, .label { margin: 0 0 12px; color: var(--mint); font-weight: 900; font-size: 13px; text-transform: uppercase; letter-spacing: 0; }
h1, h2, h3 { margin: 0; letter-spacing: 0; line-height: 1.12; }
.hero h1 { max-width: 660px; font-size: clamp(44px, 5.6vw, 76px); word-break: keep-all; }
.hero-title-line { display: block; white-space: nowrap; }
.hero-copy > p:not(.eyebrow) { max-width: 680px; margin: 24px 0 0; color: var(--muted); font-size: 20px; }
.actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 32px; }
.hero-panel { display: grid; gap: 14px; }
.hero-panel div {
  min-height: 150px;
  padding: 28px;
  color: #fff;
  background: var(--ink);
  border-radius: 18px;
}
.hero-panel div:nth-child(2) { background: var(--blue); }
.hero-panel div:nth-child(3) { background: var(--mint); }
.hero-panel span { color: rgba(255,255,255,0.65); font-weight: 900; }
.hero-panel strong { display: block; margin-top: 18px; font-size: 26px; }
.hero-panel p { margin: 8px 0 0; color: rgba(255,255,255,0.78); }

section { padding: 76px 0; }
.map-section, .compare, .cta-band { background: var(--panel); border-block: 1px solid var(--line); }
h2 { font-size: clamp(30px, 4vw, 56px); }
.route { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1px; margin-top: 34px; background: var(--line); border: 1px solid var(--line); }
.route article { padding: 24px; background: var(--panel); }
.route b { display: block; font-size: 20px; }
.route span { display: block; margin-top: 10px; color: var(--muted); }

.section-title { max-width: 760px; margin-bottom: 34px; }
.guide-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.guide-card {
  display: grid;
  gap: 10px;
  min-height: 188px;
  padding: 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
}
.guide-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.guide-card span { color: var(--rose); font-weight: 900; }
.guide-card strong { font-size: 22px; line-height: 1.28; }
.guide-card em { color: var(--muted); font-style: normal; }

.compare-grid { display: grid; grid-template-columns: 0.7fr 1.3fr; gap: 42px; align-items: start; }
table { width: 100%; border-collapse: collapse; background: #fff; border: 1px solid var(--line); border-radius: 16px; overflow: hidden; }
th, td { padding: 18px; border-bottom: 1px solid var(--line); text-align: left; }
th { color: var(--blue); background: #eef4ff; }
td { color: var(--muted); }
td:first-child { color: var(--ink); font-weight: 900; }

.faq-grid { display: grid; grid-template-columns: 0.7fr 1.3fr; gap: 42px; }
.faq-list { display: grid; gap: 12px; }
details { padding: 20px 22px; background: var(--panel); border: 1px solid var(--line); border-radius: 14px; }
summary { cursor: pointer; font-weight: 900; font-size: 19px; }
details p { margin: 12px 0 0; color: var(--muted); }
.cta-band { text-align: center; }
.cta-band p { color: var(--muted); }

.footer { padding: 28px 0; color: #c9d4e5; background: #121821; }
.footer-grid { display: flex; justify-content: space-between; gap: 20px; }
.footer p { margin: 0; }
.footer nav { display: flex; gap: 18px; }

.doc-hero { padding: 72px 0 54px; color: #fff; background: linear-gradient(135deg, #172033, #173f9a 58%, #0f9f8f); }
.doc-hero h1 { max-width: 900px; font-size: clamp(36px, 6vw, 70px); }
.doc-hero p:not(.label) { max-width: 760px; color: rgba(255,255,255,0.82); font-size: 19px; }
.crumb { display: flex; gap: 10px; margin-bottom: 24px; color: rgba(255,255,255,0.7); }
.doc-layout { display: grid; grid-template-columns: 1fr 300px; gap: 48px; padding: 56px 0 84px; }
.doc-content { display: grid; gap: 24px; }
.doc-content section { padding: 28px; background: var(--panel); border: 1px solid var(--line); border-radius: 16px; }
.doc-content h2 { font-size: 30px; }
.doc-content p { color: var(--muted); font-size: 18px; }
.doc-aside { position: sticky; top: 98px; align-self: start; padding: 24px; background: #fff; border: 1px solid var(--line); border-radius: 16px; }
.doc-aside strong { font-size: 24px; }
.doc-aside p { color: var(--muted); }
.doc-aside .primary, .doc-aside .back { width: 100%; margin-top: 12px; }
.back { display: inline-flex; justify-content: center; color: var(--blue); font-weight: 900; }
.doc-faq details { margin-top: 12px; }
.more div { display: grid; gap: 12px; }
.more a { display: grid; gap: 6px; padding: 18px; background: #f8fbff; border: 1px solid var(--line); border-radius: 12px; }
.more span { color: var(--rose); font-weight: 900; }

@media (max-width: 920px) {
  .topbar { grid-template-columns: 1fr auto; }
  .topbar nav { grid-column: 1 / -1; justify-content: space-between; }
  .hero-grid, .route, .guide-grid, .compare-grid, .faq-grid, .doc-layout { grid-template-columns: 1fr; }
  .hero-copy { padding: 34px; }
  .doc-aside { position: static; }
  .footer-grid { flex-direction: column; }
}

@media (max-width: 560px) {
  .shell { width: min(100% - 28px, 1180px); }
  .top-cta { width: 100%; grid-column: 1 / -1; }
  .hero { padding-top: 42px; }
  .hero h1 { font-size: 46px; }
  .actions a { width: 100%; }
}