* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  color: #172033;
  background: #f7f9fc;
  line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
.container { width: min(1160px, calc(100% - 32px)); margin: 0 auto; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255,255,255,.94);
  border-bottom: 1px solid #e7ebf2;
}
.nav { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; color: #123264; }
.brand img { width: 42px; height: 42px; }
nav { display: flex; gap: 22px; flex-wrap: wrap; font-size: 15px; color: #35435b; }
nav a:hover { color: #0f58b8; }
.hero {
  min-height: 520px;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #eef5ff 0%, #ffffff 50%, #e8f0fb 100%);
  border-bottom: 1px solid #e5ecf6;
}
.hero-grid { display: grid; grid-template-columns: 1.5fr .9fr; gap: 44px; align-items: center; }
.eyebrow { margin: 0 0 10px; color: #0f58b8; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; font-size: 13px; }
h1 { margin: 0; max-width: 760px; font-size: 46px; line-height: 1.18; color: #10264d; }
h2 { margin: 0 0 14px; font-size: 28px; line-height: 1.25; color: #10264d; }
h3 { margin: 0 0 8px; font-size: 20px; color: #10264d; }
.lead { max-width: 700px; margin: 22px 0 0; font-size: 18px; color: #43536f; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 30px; }
.button { display: inline-flex; padding: 12px 22px; border-radius: 6px; background: #0f58b8; color: #fff; font-weight: 700; }
.button.ghost { background: #fff; color: #0f58b8; border: 1px solid #c8d8ee; }
.hero-panel {
  padding: 30px;
  background: #10264d;
  color: #fff;
  border-radius: 8px;
  box-shadow: 0 18px 45px rgba(16,38,77,.18);
}
.hero-panel h2 { color: #fff; }
.hero-panel ul { margin: 0; padding-left: 20px; color: #dce8fb; }
.section { padding: 72px 0; }
.section-title { margin-bottom: 24px; }
.category-grid, .video-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.category-card, .video-card, .insight-box, .article-body {
  background: #fff;
  border: 1px solid #e6ebf3;
  border-radius: 8px;
  padding: 24px;
}
.category-card span { color: #0f58b8; font-weight: 800; }
.category-card p, .video-card p, .article-list p, .insight-box p, .article-body p { color: #52617a; margin: 0; }
.two-col { display: grid; grid-template-columns: 1.4fr .8fr; gap: 28px; align-items: start; }
.article-list { display: grid; gap: 14px; }
.article-list article { padding: 20px; background: #fff; border: 1px solid #e6ebf3; border-radius: 8px; }
.article-list a { display: block; margin-bottom: 8px; font-size: 19px; font-weight: 800; color: #10264d; }
.insight-box { background: #fdfefe; border-left: 4px solid #0f58b8; }
.video-grid { grid-template-columns: repeat(3, 1fr); }
.video-thumb {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 150px;
  margin-bottom: 18px;
  border-radius: 6px;
  background: linear-gradient(135deg, #123264, #0f58b8);
  color: #fff;
  font-weight: 800;
}
.page-hero { padding: 76px 0 42px; background: #edf4ff; border-bottom: 1px solid #e1e9f5; }
.page-hero h1 { font-size: 38px; }
.article-body { max-width: 850px; margin: 40px auto 72px; }
.article-body h2 { margin-top: 30px; font-size: 24px; }
.article-body ul { color: #52617a; }
.site-footer { padding: 36px 0; background: #10264d; color: #d8e4f6; }
.footer-grid { display: grid; grid-template-columns: 1fr 1.4fr; gap: 30px; }
.site-footer strong { color: #fff; font-size: 20px; }
.site-footer p { margin: 8px 0 0; }
@media (max-width: 860px) {
  .nav, .hero-grid, .two-col, .footer-grid { grid-template-columns: 1fr; display: grid; }
  nav { gap: 12px; }
  h1 { font-size: 34px; }
  .category-grid, .video-grid { grid-template-columns: 1fr; }
  .section { padding: 46px 0; }
}