:root {
  --ink: #17243c;
  --muted: #5b6577;
  --paper: #f4f6f8;
  --white: #ffffff;
  --line: #d8dee4;
  --brand: #007bb7;
  --brand-dark: #005f91;
  --teal: #148f8b;
  --coral: #d7654d;
  --night: #101d33;
  --max: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  line-height: 1.75;
  letter-spacing: 0;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
:focus-visible { outline: 3px solid #49b7c7; outline-offset: 3px; }
.container { width: min(calc(100% - 40px), var(--max)); margin: 0 auto; }

.site-header { background: var(--night); border-bottom: 1px solid rgba(255,255,255,.18); }
.nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  gap: 28px;
}
.logo { margin-right: auto; }
.logo img { width: 142px; }
.nav a:not(.logo) { color: rgba(255,255,255,.84); font-size: 14px; }
.nav a[aria-current="page"] { color: #72d5df; font-weight: 700; }
.nav .nav-cta { padding: 7px 15px; color: var(--white); background: var(--brand); }

.breadcrumb { padding: 18px 0 0; color: var(--muted); font-size: 13px; }
.breadcrumb a { color: var(--brand-dark); }
.page-hero { padding: 54px 0 66px; background: var(--white); border-bottom: 1px solid var(--line); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(280px, .6fr); gap: 64px; align-items: end; }
.kicker { margin: 0 0 12px; color: var(--brand-dark); font-size: 13px; font-weight: 700; }
h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 850px; margin-bottom: 20px; font-size: 46px; line-height: 1.22; letter-spacing: 0; }
.hero-grid > * { min-width: 0; }
h1, h2, h3, p, li, td { overflow-wrap: anywhere; }
.lede { max-width: 790px; margin-bottom: 0; color: var(--muted); font-size: 18px; }
.answer-box { padding: 22px; color: var(--white); background: var(--night); border-left: 4px solid #4bc2ca; }
.answer-box strong { display: block; margin-bottom: 6px; color: #7edbe0; }
.answer-box p { margin: 0; }

.section { padding: 74px 0; }
.section-white { background: var(--white); }
.section-dark { color: var(--white); background: var(--night); }
.section-head { max-width: 800px; margin-bottom: 34px; }
.section-head h2 { margin-bottom: 12px; font-size: 32px; line-height: 1.3; }
.section-head p { color: var(--muted); }
.section-dark .section-head p { color: rgba(255,255,255,.72); }
.direct-answer { margin: 0 0 28px; padding: 20px 22px; background: #eaf5f8; border-left: 4px solid var(--brand); font-size: 17px; }

.grid-2, .grid-3, .grid-4 { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.panel { min-height: 100%; padding: 25px; background: var(--white); border: 1px solid var(--line); border-radius: 4px; }
.panel h3 { margin-bottom: 9px; font-size: 19px; }
.panel p:last-child, .panel ul:last-child { margin-bottom: 0; }
.panel-label { display: block; margin-bottom: 12px; color: var(--teal); font-size: 12px; font-weight: 700; }
.section-dark .panel { background: #172844; border-color: rgba(255,255,255,.16); }
.section-dark .panel p, .section-dark .panel li { color: rgba(255,255,255,.76); }

.fact-table { width: 100%; border-collapse: collapse; background: var(--white); }
.fact-table th, .fact-table td { padding: 15px 17px; text-align: left; vertical-align: top; border: 1px solid var(--line); }
.fact-table th { width: 24%; background: #edf3f5; }
.steps { counter-reset: step; display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line); }
.step { min-height: 190px; padding: 24px; background: var(--white); border-right: 1px solid var(--line); }
.step:last-child { border-right: 0; }
.step::before { counter-increment: step; content: "0" counter(step); display: block; margin-bottom: 22px; color: var(--coral); font-weight: 700; }
.step h3 { font-size: 18px; }
.check-list { margin: 0; padding-left: 20px; }
.check-list li { margin-bottom: 8px; }
.notice { padding: 18px 20px; background: #fff4ed; border-left: 4px solid var(--coral); }

.link-band { padding: 34px 0; background: #e8f1f4; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.link-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.link-grid a { min-height: 88px; padding: 17px; background: var(--white); border: 1px solid var(--line); }
.link-grid strong { display: block; color: var(--brand-dark); }
.link-grid span { color: var(--muted); font-size: 13px; }

.faq-list { border-top: 1px solid var(--line); }
details { padding: 18px 4px; border-bottom: 1px solid var(--line); }
summary { cursor: pointer; font-weight: 700; }
details p { max-width: 850px; margin: 12px 0 0; color: var(--muted); }

.contact { padding: 54px 0; color: var(--white); background: #0f755f; }
.contact-inner { display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.contact h2 { margin-bottom: 8px; font-size: 28px; }
.contact p { margin-bottom: 0; color: rgba(255,255,255,.8); }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 9px 18px; color: var(--white); background: var(--brand); font-weight: 700; }
.contact .button { color: var(--ink); background: var(--white); }

footer { padding: 34px 0; color: #cbd4df; background: #0b1526; font-size: 13px; }
.footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 38px; }
.footer-grid strong { display: block; margin-bottom: 9px; color: var(--white); }
.footer-links { display: grid; gap: 6px; }
.footer-note { margin-top: 26px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.14); }

@media (max-width: 880px) {
  .nav { gap: 16px; }
  .nav a:not(.logo):not(.nav-cta) { display: none; }
  .hero-grid { grid-template-columns: 1fr; gap: 28px; }
  .grid-3, .grid-4, .link-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .step:nth-child(2) { border-right: 0; }
  .step:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
}

@media (max-width: 600px) {
  .container { width: min(calc(100% - 28px), var(--max)); }
  .nav { min-height: 64px; }
  .logo img { width: 126px; }
  .nav .nav-cta { font-size: 13px; }
  .page-hero { padding: 38px 0 50px; }
  h1 { font-size: 34px; }
  .lede { font-size: 16px; }
  .section { padding: 58px 0; }
  .section-head h2 { font-size: 27px; }
  .grid-2, .grid-3, .grid-4, .link-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .step, .step:nth-child(2) { border-right: 0; border-bottom: 1px solid var(--line); }
  .step:last-child { border-bottom: 0; }
  .fact-table th, .fact-table td { display: block; width: 100%; }
  .fact-table tr { display: block; margin-bottom: 12px; }
  .contact-inner { align-items: flex-start; flex-direction: column; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
}