/* Ultimate Air Trap - 干净静态站样式 */
:root {
  --primary: #0071e3;
  --primary-dark: #005bb5;
  --ink: #1d1d1f;
  --muted: #86868b;
  --bg: #ffffff;
  --bg-soft: #f5f5f7;
  --line: #e5e5e7;
  --radius: 16px;
  --shadow: 0 12px 32px rgba(0, 0, 0, .08);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Roboto, sans-serif;
  color: var(--ink); background: var(--bg); line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }
.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* 顶栏 */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.86); backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; color: var(--ink); }
.brand img { height: 34px; width: auto; }
.nav { display: flex; align-items: center; gap: 22px; font-size: 14px; }
.nav a { color: var(--ink); font-weight: 500; }
.nav a:hover { color: var(--primary); }
.lang-switch {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 5px 12px; border: 1px solid var(--line); border-radius: 999px;
  font-size: 13px; color: var(--ink); font-weight: 600;
}
.lang-switch:hover { border-color: var(--primary); color: var(--primary); }

/* 按钮 */
.btn {
  display: inline-block; padding: 11px 24px; border-radius: 999px;
  background: var(--primary); color: #fff; font-weight: 600; font-size: 14px;
  transition: background .2s ease, transform .2s ease;
}
.btn:hover { background: var(--primary-dark); color: #fff; transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--primary); border: 1px solid var(--primary); }
.btn-ghost:hover { background: rgba(0,113,227,.06); color: var(--primary); }

/* Hero */
.hero { padding: 72px 0 64px; text-align: center; }
.hero h1 { font-size: 46px; line-height: 1.15; font-weight: 700; letter-spacing: -.5px; }
.hero p { margin: 16px auto 28px; max-width: 640px; color: var(--muted); font-size: 18px; }
.hero-img { margin: 34px auto 0; max-width: 760px; border-radius: 24px; overflow: hidden; box-shadow: var(--shadow); }
.badge-new {
  display: inline-block; margin-bottom: 18px; padding: 5px 14px;
  background: var(--bg-soft); border-radius: 999px; font-size: 13px; color: var(--muted); font-weight: 600;
}

/* 区块 */
.section { padding: 64px 0; }
.section-alt { background: var(--bg-soft); }
.section-head { text-align: center; margin-bottom: 40px; }
.section-head h2 { font-size: 32px; letter-spacing: -.3px; }
.section-head p { margin-top: 8px; color: var(--muted); font-size: 16px; }

/* 产品卡片 */
.product-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.product-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; transition: box-shadow .25s ease, transform .25s ease;
}
.product-card:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.product-card img { width: 100%; aspect-ratio: 3/4; object-fit: cover; background: var(--bg-soft); }
.product-card-body { padding: 20px 22px 24px; }
.product-card h3 { font-size: 20px; margin-bottom: 6px; }
.product-card p { color: var(--muted); font-size: 14px; margin-bottom: 14px; }

/* 特点 */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; }
.feature {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; transition: box-shadow .25s ease;
}
.feature:hover { box-shadow: var(--shadow); }
.feature .icon { width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center; margin-bottom: 16px; }
.feature h3 { font-size: 17px; margin-bottom: 6px; }
.feature p { color: var(--muted); font-size: 14px; }
.icon-blue { background: #e8f1ff; color: #0071e3; }
.icon-purple { background: #f3eaff; color: #7b3fe4; }
.icon-green { background: #e7f8ef; color: #1ba568; }
.icon-orange { background: #fff3e6; color: #e07b1f; }
.icon-pink { background: #ffeaf0; color: #e13e6d; }
.icon-cyan { background: #e4f7fb; color: #0e9bb5; }

/* 案例 */
.case-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.case-item { border-radius: 14px; overflow: hidden; border: 1px solid var(--line); background: #fff; }
.case-item img { width: 100%; aspect-ratio: 3/4; object-fit: cover; }
.case-item p { padding: 10px 14px; font-size: 13px; color: var(--muted); }

/* 产品详情 */
.detail-layout { display: grid; grid-template-columns: minmax(300px, 460px) 1fr; gap: 40px; align-items: start; }
.detail-gallery { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.detail-info h1 { font-size: 34px; margin-bottom: 10px; }
.detail-info .lead { color: var(--muted); font-size: 16px; margin-bottom: 22px; }
.spec-table { width: 100%; border-collapse: collapse; margin-top: 8px; font-size: 14px; }
.spec-table td { padding: 11px 14px; border-bottom: 1px solid var(--line); }
.spec-table td:first-child { color: var(--muted); width: 130px; font-weight: 600; }
.photo-strip { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px; margin-top: 22px; }
.photo-strip figure { margin: 0; }
.photo-strip img { border-radius: 12px; border: 1px solid var(--line); width: 100%; }
.photo-strip figcaption { margin-top: 6px; font-size: 12px; color: var(--muted); text-align: center; }

/* FAQ */
.faq-list { max-width: 760px; margin: 0 auto; }
.faq-item { border: 1px solid var(--line); border-radius: 12px; padding: 18px 22px; margin-bottom: 12px; background: #fff; }
.faq-item summary { font-weight: 600; cursor: pointer; font-size: 15px; }
.faq-item p { margin-top: 10px; color: #4a4a4e; font-size: 14px; }

/* 联系 */
.contact-strip { text-align: center; padding: 56px 24px; }
.contact-strip h2 { font-size: 30px; margin-bottom: 10px; }
.contact-strip p { color: var(--muted); margin-bottom: 26px; }
.contact-links { display: flex; justify-content: center; gap: 18px; flex-wrap: wrap; font-size: 14px; }
.contact-links a { color: var(--ink); font-weight: 500; }
.contact-links a:hover { color: var(--primary); }

/* 页脚 */
footer { background: var(--bg-soft); border-top: 1px solid var(--line); padding: 30px 0; text-align: center; font-size: 13px; color: var(--muted); }
footer .foot-nav { display: flex; justify-content: center; gap: 20px; flex-wrap: wrap; margin-bottom: 12px; }
footer a { color: var(--muted); }
footer a:hover { color: var(--primary); }

/* 返回 */
.back { display: inline-block; margin-bottom: 24px; font-size: 14px; }

@media (max-width: 760px) {
  .hero h1 { font-size: 32px; }
  .nav { gap: 12px; font-size: 13px; }
  .nav .hide-sm { display: none; }
  .detail-layout { grid-template-columns: 1fr; }
  .section { padding: 48px 0; }
}