:root {
  color-scheme: light;
  --navy: #073f83;
  --ink: #102b47;
  --muted: #60758b;
  --line: #c7dceb;
  --cyan: #20b7dc;
  --blue: #0878df;
  --surface: #ffffff;
  --page-bg: #edf7fc;
  --shadow: 0 18px 42px rgba(20, 73, 116, .14);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--page-bg); font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif; line-height: 1.6; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.site-shell { width: min(1320px, calc(100% - 32px)); margin: 0 auto; }
.brochure-header { display: flex; align-items: center; justify-content: space-between; min-height: 76px; }
.brand { display: inline-flex; align-items: center; gap: 12px; }
.brand-mark { display: grid; width: 38px; height: 38px; place-items: center; color: #fff; background: var(--navy); border-radius: 10px; font-size: 14px; font-weight: 900; }
.brand-copy strong, .brand-copy small { display: block; }
.brand-copy strong { color: var(--navy); font-size: 16px; }
.brand-copy small { color: var(--muted); font-size: 10px; letter-spacing: .08em; }
.header-label { color: var(--navy); font-size: 13px; font-weight: 800; }
.brochure-intro { display: flex; align-items: end; justify-content: space-between; gap: 24px; padding: clamp(28px, 5vw, 58px) clamp(20px, 5vw, 64px); color: #fff; background: linear-gradient(130deg, #062e61, var(--navy)); border-radius: 8px; box-shadow: var(--shadow); }
.eyebrow { display: block; margin-bottom: 10px; color: #8edff1; font-size: 11px; font-weight: 800; letter-spacing: .14em; }
.brochure-intro h1 { max-width: 720px; margin: 0 0 8px; font-size: clamp(28px, 4vw, 48px); line-height: 1.22; }
.brochure-intro p { margin: 0; color: #c7e6f7; font-size: 16px; }
.download-link, .page-nav a { border: 1px solid rgba(255,255,255,.35); border-radius: 999px; font-size: 13px; font-weight: 800; }
.download-link { flex: 0 0 auto; padding: 10px 16px; color: var(--navy); background: #fff; }
.page-nav { display: flex; flex-wrap: wrap; gap: 10px; padding: 20px 0; }
.page-nav a { padding: 7px 13px; color: var(--navy); background: #fff; border-color: var(--line); }
.page-nav a:hover, .page-nav a:focus-visible { color: #fff; background: var(--blue); border-color: var(--blue); }
.page-nav .home-link { margin-left: auto; color: var(--blue); background: transparent; }
.brochure-content { display: grid; gap: 34px; padding-bottom: 38px; }
.page-section { padding: clamp(18px, 3vw, 28px); background: var(--surface); border: 1px solid var(--line); border-radius: 8px; box-shadow: var(--shadow); }
.section-heading { display: flex; align-items: center; gap: 10px; margin-bottom: 18px; }
.section-heading span { display: grid; width: 34px; height: 34px; place-items: center; color: #fff; background: var(--blue); border-radius: 50%; font-size: 12px; font-weight: 900; }
.section-heading h2 { margin: 0; color: var(--navy); font-size: clamp(18px, 2vw, 24px); }
.desktop-page { display: block; overflow: hidden; background: #fff; border: 1px solid var(--line); border-radius: 5px; }
.desktop-page img { width: 100%; height: auto; }
.mobile-panels { display: none; }
.brochure-footer { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 18px 34px; padding: 20px 4px 28px; color: var(--muted); font-size: 13px; }
.footer-company, .footer-contact { display: grid; gap: 2px; min-width: 0; }
.footer-company strong, .footer-contact strong { color: var(--navy); font-weight: 800; }
.footer-contact { text-align: right; }
.footer-contact span { color: var(--muted); }
.brochure-footer a { color: var(--blue); font-weight: 800; }

@media (max-width: 720px) {
  .site-shell { width: min(100% - 20px, 520px); }
  .brochure-header { min-height: 64px; }
  .brand-copy small { display: none; }
  .header-label { font-size: 12px; }
  .brochure-intro { display: block; padding: 27px 20px 24px; border-radius: 7px; }
  .brochure-intro h1 { font-size: 29px; }
  .brochure-intro p { font-size: 14px; }
  .download-link { display: inline-flex; margin-top: 18px; }
  .page-nav { position: sticky; z-index: 3; top: 0; padding: 12px 0; background: rgba(237,247,252,.94); backdrop-filter: blur(12px); }
  .page-nav .home-link { margin-left: 0; }
  .brochure-content { gap: 24px; }
  .page-section { padding: 14px; }
  .section-heading { margin: 2px 2px 14px; }
  .section-heading h2 { font-size: 17px; }
  .desktop-page { display: none; }
  .mobile-panels { display: grid; gap: 14px; }
  .mobile-panels figure { margin: 0; overflow: hidden; background: #fff; border: 1px solid var(--line); border-radius: 5px; box-shadow: 0 10px 24px rgba(20, 73, 116, .12); }
  .mobile-panels img { width: 100%; height: auto; }
  .brochure-footer { grid-template-columns: 1fr; gap: 10px; padding: 16px 4px 24px; font-size: 12px; }
  .footer-contact { text-align: left; }
}