:root {
  --navy: #1b3a5c;
  --navy-dark: #102a43;
  --orange: #ff6633;
  --paper: #f8fafc;
  --line: #cbd5e1;
  --text: #263746;
  --muted: #64748b;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  font-family: "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
  background-color: #fff;
  background-image: linear-gradient(rgba(27,58,92,.045) 1px, transparent 1px), linear-gradient(90deg, rgba(27,58,92,.045) 1px, transparent 1px);
  background-size: 30px 30px;
  line-height: 1.7;
}
a { color: inherit; }
.site-header { background: #fff; border-bottom: 2px solid var(--navy); }
.nav { max-width: 1180px; min-height: 82px; margin: auto; padding: 14px 24px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.logo { width: 168px; display: block; }
.nav-links { display: flex; gap: 24px; align-items: center; font-weight: 700; }
.nav-links a { text-decoration: none; }
.nav-links a:hover { color: var(--orange); }
.hero { background: var(--navy); color: #fff; padding: 72px 24px; text-align: center; }
.hero-inner, .container { max-width: 1180px; margin: auto; }
.eyebrow { color: #ffd0bf; font-weight: 700; letter-spacing: .08em; }
h1 { margin: 10px auto 18px; max-width: 980px; font-size: clamp(34px, 5vw, 62px); line-height: 1.15; }
.hero p { max-width: 820px; margin: 0 auto; font-size: 20px; color: #e2e8f0; }
.section { padding: 68px 24px; }
.section h2 { color: var(--navy); font-size: clamp(28px, 3vw, 40px); text-align: center; margin: 0 0 12px; }
.section-lead { max-width: 850px; margin: 0 auto 36px; text-align: center; color: var(--muted); font-size: 18px; }
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.case-card { display: flex; flex-direction: column; background: #fff; border: 1px solid var(--line); box-shadow: 4px 4px 0 var(--navy); text-decoration: none; transition: transform .18s ease, box-shadow .18s ease; }
.case-card:hover { transform: translateY(-4px); box-shadow: 7px 7px 0 var(--navy); }
.case-card img { width: 100%; aspect-ratio: 16/10; object-fit: cover; border-bottom: 1px solid var(--line); }
.case-card-body { padding: 22px; flex: 1; }
.case-card h2 { text-align: left; font-size: 22px; margin: 0 0 8px; }
.case-card p { color: var(--muted); margin: 0 0 14px; }
.case-link { color: var(--orange); font-weight: 700; }
.breadcrumbs { max-width: 1180px; margin: auto; padding: 18px 24px; color: var(--muted); font-size: 14px; }
.breadcrumbs a { color: var(--navy); }
.case-video { width: 100%; max-height: 680px; display: block; background: #e5e7eb; border: 2px solid var(--navy); box-shadow: 8px 8px 0 var(--navy); }
.fact-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 36px; }
.fact { background: #fff; border: 1px solid var(--line); padding: 20px; }
.fact strong { display: block; color: var(--navy); margin-bottom: 6px; }
.content-grid { display: grid; grid-template-columns: 1.4fr .8fr; gap: 32px; align-items: start; }
.panel { background: #fff; border: 1px solid var(--line); padding: 30px; }
.panel h2 { text-align: left; font-size: 28px; }
.panel h3 { color: var(--navy); margin-top: 26px; }
.check-list { padding-left: 22px; }
.check-list li { margin: 10px 0; }
.quote { border-left: 5px solid var(--orange); margin: 0; padding: 22px; background: #fff7ed; font-size: 18px; }
.quote cite { display: block; margin-top: 14px; color: var(--navy); font-style: normal; font-weight: 700; }
.notice { background: #eef4fa; border: 1px solid #b8c9dc; padding: 20px; color: #334155; }
.cta { text-align: center; background: var(--navy); color: #fff; padding: 62px 24px; }
.cta h2 { font-size: 34px; margin: 0 0 10px; }
.btn { display: inline-block; margin-top: 20px; padding: 14px 28px; background: var(--orange); color: #fff; text-decoration: none; font-weight: 700; }
.footer { background: var(--navy-dark); color: #cbd5e1; padding: 28px 24px; text-align: center; }
.footer a { color: #fff; }
.case-card-link { color: inherit; text-decoration: none; display: block; }
@media (max-width: 850px) {
  .nav { min-height: 66px; }
  .logo { width: 126px; }
  .nav-links { gap: 12px; font-size: 14px; }
  .hero { padding: 52px 20px; }
  .hero p { font-size: 17px; }
  .section { padding: 48px 18px; }
  .case-grid, .fact-grid, .content-grid { grid-template-columns: 1fr; }
  .case-video { box-shadow: 4px 4px 0 var(--navy); }
}