/* SPEEDT 官网共享样式 - 高流量空气滤芯 */
:root {
  --ink: #101418;
  --ink-soft: #3d4550;
  --muted: #6b7280;
  --line: #e5e8ec;
  --bg: #f6f7f9;
  --paper: #ffffff;
  --accent: #e8651e;
  --accent-soft: #fff1ea;
  --dark: #101418;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(16,20,24,.04), 0 8px 24px rgba(16,20,24,.06);
  --maxw: 1100px;
  --font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", system-ui, -apple-system, sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
img { max-width: 100%; display: block; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ===== 顶栏导航 ===== */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: .3px; color: var(--ink); }
.brand .mark {
  width: 30px; height: 30px; border-radius: 8px;
  background: var(--ink); color: #fff;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 800;
}
.brand .logo { height: 30px; width: auto; display: block; }
.nav-links { display: flex; gap: 26px; align-items: center; }
.nav-links a { color: var(--ink-soft); font-size: 15px; font-weight: 500; }
.nav-links a:hover { color: var(--accent); }
.nav-links a.active { color: var(--accent); }
.nav-cta {
  background: var(--accent); color: #fff !important;
  padding: 8px 16px; border-radius: 9px; font-weight: 600;
}
.nav-cta:hover { background: #d2540f; color: #fff !important; }

/* ===== Hero ===== */
.hero {
  background: linear-gradient(160deg, #101418 0%, #1b222b 55%, #25303c 100%);
  color: #f5f7f9;
  padding: 84px 0 76px;
  position: relative; overflow: hidden;
}
.hero .wrap { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center; }
.hero-eyebrow { color: var(--accent); font-weight: 600; letter-spacing: 1px; font-size: 13px; text-transform: uppercase; margin-bottom: 16px; }
.hero h1 { font-size: 44px; line-height: 1.2; font-weight: 900; letter-spacing: -.5px; margin-bottom: 18px; }
.hero-sub { font-size: 18px; color: #c8d0d9; max-width: 520px; margin-bottom: 26px; }
.hero-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 26px 0 30px; }
.hero-stat { background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.12); border-radius: 12px; padding: 14px 16px; }
.hero-stat .num { font-size: 24px; font-weight: 800; color: #fff; display: block; line-height: 1.2; }
.hero-stat .lbl { font-size: 12.5px; color: #aab3be; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 22px; border-radius: 10px; font-weight: 600; font-size: 15px; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #d2540f; color: #fff; }
.btn-ghost { border: 1px solid rgba(255,255,255,.3); color: #e8edf2; }
.btn-ghost:hover { background: rgba(255,255,255,.08); color: #fff; }
.hero-img { border-radius: 16px; overflow: hidden; box-shadow: 0 20px 50px rgba(0,0,0,.4); }
.hero-img img { width: 100%; height: 100%; object-fit: cover; }

/* ===== 区块通用 ===== */
.section { padding: 72px 0; }
.section.alt { background: var(--paper); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.sec-head { text-align: center; max-width: 640px; margin: 0 auto 42px; }
.sec-head h2 { font-size: 30px; font-weight: 800; letter-spacing: -.3px; margin-bottom: 12px; }
.sec-head p { color: var(--muted); font-size: 16px; }

/* ===== 卖点卡片 ===== */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; box-shadow: var(--shadow);
}
.card .ico { width: 44px; height: 44px; border-radius: 11px; background: var(--accent-soft); display: flex; align-items: center; justify-content: center; margin-bottom: 16px; }
.card h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 14.5px; }
.card .big { color: var(--accent); font-weight: 800; font-size: 26px; display: block; margin: 4px 0 2px; }

/* ===== 参数表 ===== */
.spec-table { width: 100%; border-collapse: collapse; background: var(--paper); border-radius: 12px; overflow: hidden; box-shadow: var(--shadow); }
.spec-table th, .spec-table td { text-align: left; padding: 15px 20px; border-bottom: 1px solid var(--line); vertical-align: top; }
.spec-table th { background: #f0f2f5; font-weight: 700; color: var(--ink); font-size: 14px; }
.spec-table td { font-size: 14.5px; color: var(--ink-soft); }
.spec-table tr:last-child td { border-bottom: none; }
.spec-table td b { color: var(--ink); }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 26px; margin-bottom: 16px; box-shadow: var(--shadow); }
.faq-item .q { font-weight: 700; font-size: 16px; margin-bottom: 8px; color: var(--ink); }
.faq-item .a { color: var(--ink-soft); font-size: 15px; }

/* ===== 适配表 ===== */
.fit-card { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); margin-bottom: 20px; }
.fit-card .brand-row { background: var(--dark); color: #fff; padding: 16px 24px; font-weight: 700; font-size: 17px; }
.fit-table { width: 100%; border-collapse: collapse; }
.fit-table th, .fit-table td { padding: 13px 24px; border-bottom: 1px solid var(--line); text-align: left; }
.fit-table th { color: var(--muted); font-weight: 600; font-size: 13px; background: #f6f7f9; }
.fit-table td { font-size: 15px; }
.fit-table tr:last-child td { border-bottom: none; }

/* ===== 联系 ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.contact-panel { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 30px; box-shadow: var(--shadow); }
.contact-panel h3 { font-size: 19px; margin-bottom: 14px; }
.contact-panel p { color: var(--ink-soft); margin-bottom: 8px; }
.contact-panel .row { display: flex; justify-content: space-between; padding: 12px 0; border-bottom: 1px dashed var(--line); font-size: 15px; }
.contact-panel .row span { color: var(--muted); }
.contact-panel .row b { color: var(--ink); }
.tel-big { font-size: 26px; font-weight: 800; color: var(--accent); }

/* ===== 产品图集 ===== */
.gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.gallery-item { position: relative; border-radius: var(--radius); overflow: hidden; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow); }
.gallery-item img { width: 100%; aspect-ratio: 4/3; object-fit: cover; display: block; }
.gallery-item .tag { position: absolute; left: 12px; top: 12px; background: rgba(16,20,24,.72); color: #fff; font-size: 12px; padding: 4px 10px; border-radius: 6px; }
.gallery-cap { padding: 12px 16px; font-size: 13.5px; color: var(--ink-soft); }
@media (max-width: 900px) { .gallery { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .gallery { grid-template-columns: 1fr; } }

/* ===== 二维码 ===== */
.qr-section { margin-top: 36px; }
.qr-section .sec-head { margin-bottom: 28px; }
.qr-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; max-width: 720px; margin: 0 auto; }
.qr-card { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); text-align: center; }
.qr-card h3 { font-size: 17px; margin-bottom: 4px; }
.qr-card .sub { color: var(--muted); font-size: 13px; margin-bottom: 14px; }
.qr-card img { width: 200px; height: auto; margin: 0 auto; border-radius: 8px; border: 1px solid var(--line); }
.qr-card .tip { margin-top: 12px; font-size: 13px; color: var(--ink-soft); }
@media (max-width: 640px) { .qr-grid { grid-template-columns: 1fr; } .qr-card img { width: 220px; } }

/* ===== CTA + 页脚 ===== */
.cta-band { background: linear-gradient(120deg, #101418, #1d2933); color: #fff; text-align: center; padding: 60px 0; }
.cta-band h2 { font-size: 28px; font-weight: 800; margin-bottom: 12px; }
.cta-band p { color: #c8d0d9; margin-bottom: 24px; }
.site-footer { background: #0d1013; color: #8f97a1; padding: 34px 0; font-size: 13.5px; }
.footer-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px; }
.footer-inner a { color: #aab3be; }
.footer-inner a:hover { color: #fff; }

/* ===== 面包屑 ===== */
.crumb { font-size: 13.5px; color: var(--muted); padding: 16px 0 0; }
.crumb a { color: var(--muted); }
.crumb a:hover { color: var(--accent); }
.page-hero { background: var(--dark); color: #fff; padding: 52px 0 48px; }
.page-hero h1 { font-size: 32px; font-weight: 800; margin-bottom: 10px; }
.page-hero p { color: #c8d0d9; max-width: 620px; }

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .hero { padding: 56px 0 48px; }
  .hero .wrap { grid-template-columns: 1fr; }
  .hero h1 { font-size: 34px; }
  .hero-stats { grid-template-columns: repeat(3, 1fr); }
  .cards { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .nav-links { gap: 16px; }
  .nav-links a { font-size: 14px; }
}
@media (max-width: 560px) {
  .wrap { padding: 0 16px; }
  .hero-stats { grid-template-columns: 1fr; }
  .nav .nav-cta { display: none; }
  .section { padding: 52px 0; }
  .sec-head h2 { font-size: 25px; }
  .tel-big { font-size: 22px; }
}