:root {
  --ink: #102033;
  --muted: #526173;
  --line: #dbe3ec;
  --paper: #ffffff;
  --soft: #f3f7fb;
  --navy: #0a1c33;
  --blue: #1557b0;
  --blue-soft: #eaf2fd;
  --amber: #a65d00;
  --amber-soft: #fff6e8;
  --radius: 8px;
  --shadow: 0 12px 34px rgba(16, 32, 51, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: #f7f9fc;
  color: var(--ink);
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.78;
}

a {
  color: var(--blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(10, 28, 51, 0.98);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1120px, calc(100% - 40px));
  min-height: 68px;
  margin: 0 auto;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0;
}

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.55);
  color: #fff;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 18px;
  font-size: 14px;
}

.site-nav a {
  color: #d9e7f6;
}

.hero {
  padding: 54px 0 44px;
  background: linear-gradient(135deg, #08182c 0%, #12345b 100%);
  color: #fff;
}

.hero-inner,
.container {
  width: min(960px, calc(100% - 40px));
  margin: 0 auto;
}

.eyebrow {
  margin-bottom: 10px;
  color: #9cc6f3;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.35;
}

h1 {
  max-width: 820px;
  margin-bottom: 14px;
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: clamp(30px, 5vw, 44px);
  letter-spacing: 0;
}

.hero p {
  max-width: 820px;
  margin: 0;
  color: #d9e7f6;
  font-size: 17px;
}

.breadcrumb {
  padding: 15px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumb li + li::before {
  margin-right: 7px;
  color: #9aa8b8;
  content: "/";
}

main {
  padding-bottom: 60px;
}

.content {
  width: min(960px, calc(100% - 40px));
  margin: 0 auto;
}

.section {
  padding: 34px 0 0;
}

.section h2 {
  margin-bottom: 16px;
  font-size: 26px;
}

.section h3 {
  margin: 26px 0 10px;
  font-size: 20px;
}

.section p {
  margin: 0 0 16px;
}

.answer {
  padding: 20px 22px;
  border-left: 4px solid var(--blue);
  background: var(--paper);
  box-shadow: var(--shadow);
}

.answer strong {
  color: var(--navy);
}

.notice {
  padding: 16px 18px;
  border: 1px solid #f0c982;
  border-radius: var(--radius);
  background: var(--amber-soft);
  color: #64400b;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.card {
  display: block;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: 0 6px 20px rgba(16, 32, 51, 0.05);
}

.card:hover {
  border-color: #9bbce5;
  text-decoration: none;
  transform: translateY(-1px);
}

.card h3 {
  margin: 0 0 8px;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.facts,
.compare {
  width: 100%;
  border-collapse: collapse;
  background: var(--paper);
}

.facts th,
.facts td,
.compare th,
.compare td {
  padding: 12px 14px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.facts th,
.compare th {
  background: var(--soft);
  color: #26394f;
}

.checklist {
  margin: 0;
  padding: 0;
  list-style: none;
}

.checklist li {
  position: relative;
  margin: 0 0 10px;
  padding-left: 25px;
}

.checklist li::before {
  position: absolute;
  top: 0;
  left: 0;
  color: var(--blue);
  font-weight: 800;
  content: "✓";
}

.faq {
  border-top: 1px solid var(--line);
}

.faq details {
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

.faq summary {
  cursor: pointer;
  padding: 18px 42px 18px 18px;
  color: #172b42;
  font-weight: 700;
}

.faq details p {
  margin: 0;
  padding: 0 18px 20px;
  color: var(--muted);
}

.cta {
  margin-top: 40px;
  padding: 28px;
  border-radius: var(--radius);
  background: var(--navy);
  color: #fff;
}

.cta h2 {
  margin-bottom: 10px;
}

.cta p {
  color: #d9e7f6;
}

.button {
  display: inline-block;
  margin-top: 4px;
  padding: 11px 18px;
  border-radius: 6px;
  background: #fff;
  color: var(--navy);
  font-weight: 700;
}

.button:hover {
  text-decoration: none;
}

.meta {
  color: var(--muted);
  font-size: 13px;
}

.site-footer {
  padding: 30px 0;
  background: #08182c;
  color: #bed0e4;
  font-size: 14px;
}

.footer-inner {
  display: flex;
  width: min(960px, calc(100% - 40px));
  margin: 0 auto;
  justify-content: space-between;
  gap: 24px;
}

.site-footer a {
  color: #fff;
}

@media (max-width: 760px) {
  .header-inner,
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .header-inner {
    padding: 14px 0;
  }

  .site-nav {
    justify-content: flex-start;
    gap: 10px 16px;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .facts,
  .compare {
    display: block;
    overflow-x: auto;
  }

  .hero {
    padding-top: 40px;
  }
}