:root {
  --ink: #142033;
  --muted: #5b6878;
  --line: #d7e3ef;
  --surface: #ffffff;
  --surface-soft: #f3f8fc;
  --blue: #1677c8;
  --blue-dark: #0d568f;
  --cyan: #0a9f9a;
  --yellow: #f3b52b;
  --danger: #b64848;
  --shadow: 0 16px 42px rgba(26, 74, 111, 0.11);
  --radius: 8px;
  --max: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #edf4fa;
  font-family: "Microsoft YaHei", "PingFang SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.7;
  letter-spacing: 0;
}
a { color: var(--blue-dark); }
img { display: block; max-width: 100%; }
button, input { font: inherit; }
button { cursor: pointer; }
.skip-link { position: fixed; top: 8px; left: 8px; z-index: 99; padding: 8px 12px; background: #fff; transform: translateY(-150%); }
.skip-link:focus { transform: none; }
.container { width: min(calc(100% - 32px), var(--max)); margin: 0 auto; }
.site-header { position: sticky; top: 0; z-index: 30; border-bottom: 1px solid rgba(22, 119, 200, 0.14); background: rgba(255, 255, 255, 0.96); backdrop-filter: blur(12px); }
.header-inner { min-height: 66px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 800; text-decoration: none; white-space: nowrap; }
.brand-mark { width: 32px; height: 32px; display: grid; place-items: center; border-radius: 6px; color: #fff; background: var(--blue); font-size: 15px; }
.site-nav { display: flex; align-items: center; gap: 22px; }
.site-nav a { color: #344153; font-size: 14px; font-weight: 700; text-decoration: none; }
.site-nav a[aria-current="page"], .site-nav a:hover { color: var(--blue); }
.menu-button { display: none; width: 40px; height: 40px; border: 1px solid var(--line); border-radius: 6px; background: #fff; color: var(--ink); font-size: 20px; }
.hero { position: relative; overflow: hidden; padding: 72px 0 58px; background: #dfeefa; border-bottom: 1px solid var(--line); }
.hero::after { content: ""; position: absolute; inset: auto 0 0; height: 5px; background: linear-gradient(90deg, var(--blue), var(--cyan), var(--yellow)); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(340px, 0.75fr); align-items: center; gap: 54px; }
.eyebrow { margin: 0 0 10px; color: var(--blue-dark); font-size: 13px; font-weight: 800; text-transform: uppercase; }
h1, h2, h3 { line-height: 1.25; }
h1 { margin: 0; max-width: 780px; font-size: clamp(36px, 5vw, 62px); }
.hero-copy { max-width: 720px; margin: 22px 0 0; color: #46576a; font-size: 18px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.button { min-height: 46px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 1px solid transparent; border-radius: 6px; padding: 10px 18px; font-weight: 800; text-decoration: none; }
.button.primary { color: #fff; background: var(--blue); }
.button.secondary { color: var(--blue-dark); border-color: #9cc5e4; background: #fff; }
.button:hover { filter: brightness(0.96); }
.hero-points { display: flex; flex-wrap: wrap; gap: 12px 22px; margin: 28px 0 0; padding: 0; color: #304156; list-style: none; font-size: 14px; font-weight: 700; }
.hero-points li::before { content: "✓"; margin-right: 7px; color: var(--cyan); }
.calculator { padding: 24px; border: 1px solid #b9d7ea; border-radius: var(--radius); background: rgba(255,255,255,0.94); box-shadow: var(--shadow); }
.calculator h2 { margin: 0; font-size: 22px; }
.calculator .rate { margin: 4px 0 20px; color: var(--blue-dark); font-weight: 800; }
.field label { display: block; margin-bottom: 7px; font-size: 14px; font-weight: 800; }
.field input { width: 100%; height: 48px; border: 1px solid #b9cddd; border-radius: 6px; padding: 0 13px; background: #fff; color: var(--ink); }
.field input:focus { outline: 3px solid rgba(22, 119, 200, 0.14); border-color: var(--blue); }
.preset-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin: 10px 0 18px; }
.preset-row button { min-height: 36px; border: 1px solid var(--line); border-radius: 5px; background: var(--surface-soft); color: var(--blue-dark); font-weight: 800; }
.estimate { display: flex; align-items: end; justify-content: space-between; gap: 16px; padding: 17px; border-left: 4px solid var(--cyan); background: #edf9f7; }
.estimate span { color: var(--muted); font-size: 13px; }
.estimate strong { display: block; color: #08766f; font-size: 30px; line-height: 1.2; }
.calculator-note { margin: 13px 0 0; color: var(--muted); font-size: 12px; }
.section { padding: 68px 0; }
.section.white { background: #fff; }
.section-heading { max-width: 720px; margin-bottom: 30px; }
.section-heading h2 { margin: 0; font-size: 34px; }
.section-heading p { margin: 10px 0 0; color: var(--muted); }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.info-card { min-height: 100%; padding: 24px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: 0 8px 26px rgba(24, 61, 91, 0.06); }
.info-card .number { width: 34px; height: 34px; display: grid; place-items: center; margin-bottom: 16px; border-radius: 6px; color: #fff; background: var(--blue); font-weight: 800; }
.info-card h3 { margin: 0 0 8px; font-size: 20px; }
.info-card p { margin: 0; color: var(--muted); }
.price-table { width: 100%; border-collapse: collapse; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.price-table th, .price-table td { padding: 14px 16px; border-bottom: 1px solid var(--line); text-align: left; }
.price-table th { color: #314153; background: #eaf3fa; }
.price-table tr:last-child td { border-bottom: 0; }
.safety-band { padding: 28px; border: 1px solid #aedbd6; border-left: 5px solid var(--cyan); border-radius: var(--radius); background: #effaf8; }
.safety-band h2, .safety-band h3 { margin-top: 0; }
.safety-band p:last-child { margin-bottom: 0; }
.address-box { display: flex; align-items: center; gap: 10px; margin-top: 18px; padding: 13px; border: 1px solid var(--line); border-radius: 6px; background: #fff; }
.address-box code { min-width: 0; flex: 1; overflow-wrap: anywhere; color: var(--blue-dark); font-size: 13px; }
.copy-button { min-height: 40px; flex: 0 0 auto; border: 0; border-radius: 5px; padding: 8px 14px; color: #fff; background: var(--blue); font-weight: 800; }
.content-hero { padding: 48px 0 38px; border-bottom: 1px solid var(--line); background: #e2eff8; }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; color: var(--muted); font-size: 13px; }
.breadcrumbs a { text-decoration: none; }
.content-hero h1 { font-size: clamp(32px, 4vw, 48px); }
.content-hero p { max-width: 760px; margin: 14px 0 0; color: var(--muted); font-size: 17px; }
.article { max-width: 840px; padding: 52px 0 72px; }
.article h2 { margin: 40px 0 12px; font-size: 27px; }
.article h3 { margin: 26px 0 8px; font-size: 20px; }
.article p, .article li { color: #465568; }
.article li + li { margin-top: 8px; }
.faq-list { display: grid; gap: 12px; }
details { border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
summary { padding: 17px 19px; font-weight: 800; cursor: pointer; }
details p { margin: 0; padding: 0 19px 18px; }
.notice { padding: 18px 20px; border-left: 4px solid var(--yellow); background: #fff8e6; color: #66501e; }
.site-footer { padding: 36px 0; color: #dce8f2; background: #14283b; }
.footer-grid { display: grid; grid-template-columns: 1.2fr 0.8fr 0.8fr; gap: 36px; }
.site-footer strong { color: #fff; }
.site-footer p { margin: 9px 0 0; color: #b8c8d5; font-size: 14px; }
.site-footer nav { display: grid; gap: 8px; }
.site-footer a { color: #dce8f2; text-decoration: none; }
.footer-bottom { margin-top: 28px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,0.14); color: #9eb1c0; font-size: 13px; }

@media (max-width: 860px) {
  .menu-button { display: grid; place-items: center; }
  .site-nav { position: absolute; top: 66px; left: 0; right: 0; display: none; padding: 14px 16px 20px; border-bottom: 1px solid var(--line); background: #fff; }
  .site-nav.open { display: grid; gap: 12px; }
  .hero { padding-top: 48px; }
  .hero-grid { grid-template-columns: 1fr; gap: 34px; }
  .grid-3, .footer-grid { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .container { width: min(calc(100% - 24px), var(--max)); }
  .hero { padding: 38px 0 44px; }
  h1 { font-size: 38px; }
  .hero-copy { font-size: 16px; }
  .calculator { padding: 18px; }
  .section { padding: 48px 0; }
  .section-heading h2 { font-size: 28px; }
  .grid-2 { grid-template-columns: 1fr; }
  .preset-row { grid-template-columns: repeat(2, 1fr); }
  .estimate { align-items: flex-start; flex-direction: column; }
  .address-box { align-items: stretch; flex-direction: column; }
  .copy-button { width: 100%; }
  .price-table { font-size: 14px; }
  .price-table th, .price-table td { padding: 11px 9px; }
}