:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-strong: #f0f3f8;
  --text: #1f2937;
  --muted: #667085;
  --line: #d9e0ea;
  --brand: #274060;
  --brand-2: #375a7f;
  --accent: #d89933;
  --radius: 22px;
  --shadow: 0 18px 50px rgba(34, 48, 74, 0.12);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.72;
}
a { color: inherit; text-decoration: none; }
img, video { max-width: 100%; display: block; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  max-width: 1180px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  padding: 16px 22px 10px;
}
.brand-logo, .footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  color: var(--brand);
  letter-spacing: 0.02em;
}
.brand-logo img, .footer-logo img { width: 42px; height: 42px; }
.domain-pill {
  color: var(--muted);
  background: var(--surface-strong);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 14px;
}
.main-nav {
  max-width: 1180px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0 22px 12px;
}
.main-nav a {
  padding: 8px 12px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 14px;
}
.main-nav a:hover, .main-nav a.active { background: var(--brand); color: #fff; }
.search-bar {
  max-width: 1180px;
  margin: 0 auto 14px;
  padding: 0 22px;
  display: grid;
  grid-template-columns: auto minmax(200px, 1fr) auto;
  gap: 10px;
  align-items: center;
}
.search-bar label { font-weight: 700; color: var(--brand); }
.search-bar input {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 12px 16px;
  font-size: 15px;
  background: #fff;
}
.search-bar button, .btn {
  border: 0;
  border-radius: 999px;
  background: var(--brand);
  color: #fff;
  padding: 12px 18px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(39,64,96,0.18);
}
.btn.secondary { background: #fff; color: var(--brand); border: 1px solid var(--line); box-shadow: none; }
#siteSearchTip { grid-column: 2 / 4; margin: 0; color: var(--muted); font-size: 13px; }
main { max-width: 1180px; margin: 0 auto; padding: 26px 22px 70px; }
.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 30px;
  align-items: center;
  padding: 42px;
  border-radius: calc(var(--radius) + 8px);
  background: linear-gradient(135deg, #ffffff 0%, #eef3f9 100%);
  box-shadow: var(--shadow);
}
.eyebrow { color: var(--accent); font-weight: 800; margin: 0 0 10px; }
h1 { font-size: clamp(34px, 5vw, 60px); line-height: 1.12; margin: 0 0 18px; color: var(--brand); }
h2 { font-size: clamp(26px, 3.5vw, 38px); line-height: 1.25; color: var(--brand); margin: 0 0 14px; }
h3 { font-size: 20px; color: var(--brand); margin: 0 0 10px; }
p { margin: 0 0 14px; }
.hero-lead { font-size: 18px; color: var(--muted); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 24px 0; }
.hero-points { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 10px; padding: 0; margin: 0; list-style: none; }
.hero-points li { background: #fff; padding: 13px; border: 1px solid var(--line); border-radius: 16px; }
.hero-media figure { margin: 0; position: relative; overflow: hidden; border-radius: var(--radius); box-shadow: var(--shadow); }
.hero-media figcaption { padding: 10px 12px; background: #fff; font-size: 13px; color: var(--muted); }
.section { padding: 58px 0 0; }
.section-head { max-width: 760px; margin-bottom: 24px; }
.section-head p { color: var(--muted); }
.card-grid, .video-grid, .review-grid, .scenario-grid, .process-grid, .update-list, .contact-grid {
  display: grid;
  gap: 18px;
}
.card-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
.video-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
.review-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
.scenario-grid { grid-template-columns: repeat(4, minmax(0,1fr)); }
.process-grid { grid-template-columns: repeat(4, minmax(0,1fr)); }
.contact-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
.feature-card, .video-card, .review-card, .scenario-card, .process-card, .update-card, .contact-card, .plain-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: 0 12px 28px rgba(34, 48, 74, 0.07);
}
.card-icon {
  width: 44px; height: 44px;
  display: grid; place-items: center;
  border-radius: 14px;
  background: var(--surface-strong);
  color: var(--brand);
  font-weight: 900;
  margin-bottom: 14px;
}
.text-link { color: var(--brand-2); font-weight: 800; }
.video-card { padding: 0; overflow: hidden; }
.video-card figure { margin: 0; position: relative; background: #dbe4ef; }
.video-shell { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; background: #dbe4ef; }
.play-badge {
  position: absolute;
  inset: 50% auto auto 50%;
  transform: translate(-50%, -50%) scale(0.9);
  width: 64px;
  height: 64px;
  border-radius: 999px;
  border: 0;
  background: rgba(255,255,255,0.9);
  color: var(--brand);
  font-size: 24px;
  opacity: 0;
  transition: opacity .2s ease, transform .2s ease;
  cursor: pointer;
}
.video-card:hover .play-badge, .video-card:focus-within .play-badge, .video-card.is-active .play-badge {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}
.video-card figcaption { padding: 9px 14px; font-size: 12px; color: var(--muted); background: #fff; }
.video-body { padding: 20px; }
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
.tag-row span {
  background: #eef3f9;
  color: var(--brand);
  border-radius: 999px;
  padding: 5px 10px;
  font-size: 13px;
  font-weight: 700;
}
.video-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin: 12px 0 16px;
}
.video-stats div { border: 1px solid var(--line); border-radius: 14px; padding: 10px; }
.video-stats dt { font-size: 12px; color: var(--muted); }
.video-stats dd { margin: 0; font-weight: 800; color: var(--brand); }
.update-list { grid-template-columns: repeat(2, minmax(0,1fr)); }
.update-card time { color: var(--accent); font-weight: 800; }
.faq-list { display: grid; gap: 12px; }
details { background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 16px 18px; }
summary { cursor: pointer; font-weight: 800; color: var(--brand); }
details p { margin-top: 10px; color: var(--muted); }
.stars { color: var(--accent); letter-spacing: 2px; margin-bottom: 8px; }
.review-card span { display: block; color: var(--muted); font-size: 14px; }
.breadcrumb { display: flex; gap: 8px; flex-wrap: wrap; color: var(--muted); margin: 4px 0 22px; font-size: 14px; }
.breadcrumb a { color: var(--brand); font-weight: 700; }
.page-hero { padding: 34px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); margin-bottom: 26px; }
.check-list { padding-left: 20px; }
.check-list li { margin: 8px 0; }
.cta-band {
  margin-top: 42px;
  padding: 30px;
  border-radius: var(--radius);
  background: var(--brand);
  color: #fff;
  display: flex;
  gap: 18px;
  justify-content: space-between;
  align-items: center;
}
.cta-band h2 { color: #fff; }
.cta-band .btn { background: #fff; color: var(--brand); box-shadow: none; }
.site-footer { background: #172336; color: #dce4ef; padding: 44px 22px 20px; }
.footer-grid { max-width: 1180px; margin: 0 auto; display: grid; grid-template-columns: 1.2fr .8fr .9fr; gap: 26px; }
.footer-logo { color: #fff; }
.site-footer h2 { color: #fff; font-size: 20px; }
.footer-links { list-style: none; padding: 0; margin: 0; columns: 2; }
.footer-links li { margin-bottom: 8px; }
.safe-note { color: #ffd89d; }
.copyright { max-width: 1180px; margin: 28px auto 0; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.14); color: #a9b4c3; font-size: 14px; }
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding: 28px; }
  .card-grid, .video-grid, .review-grid, .scenario-grid, .process-grid, .update-list, .contact-grid, .footer-grid { grid-template-columns: 1fr 1fr; }
  .search-bar { grid-template-columns: 1fr; }
  #siteSearchTip { grid-column: 1; }
}
@media (max-width: 640px) {
  .header-inner { align-items: flex-start; flex-direction: column; }
  .main-nav { overflow-x: auto; flex-wrap: nowrap; }
  .hero-points, .card-grid, .video-grid, .review-grid, .scenario-grid, .process-grid, .update-list, .contact-grid, .footer-grid { grid-template-columns: 1fr; }
  h1 { font-size: 34px; }
  main { padding-inline: 16px; }
  .cta-band { flex-direction: column; align-items: flex-start; }
}

.contact-form { display: grid; gap: 14px; }
.contact-form label { display: grid; gap: 8px; font-weight: 800; color: var(--brand); }
.contact-form input, .contact-form textarea { width: 100%; border: 1px solid var(--line); border-radius: 16px; padding: 12px 14px; font: inherit; }