/* ============================================================
   北京市京讯电信器材有限公司 — 全站样式
   主色：深蓝 #0E2A57 / 强调红 #D22630 / 辅助灰蓝
   ============================================================ */

:root {
  --blue-900: #081D3D;
  --blue-800: #0E2A57;
  --blue-700: #16386F;
  --blue-600: #1D4A8F;
  --blue-100: #E8EEF7;
  --blue-50: #F4F7FC;
  --red: #D22630;
  --red-dark: #A81C25;
  --ink: #1F2733;
  --body: #3B4656;
  --muted: #6E7A8A;
  --line: #E2E8F0;
  --bg: #FFFFFF;
  --bg-soft: #F4F6FA;
  --shadow-sm: 0 1px 3px rgba(14, 42, 87, .07);
  --shadow-md: 0 6px 20px rgba(14, 42, 87, .10);
  --shadow-lg: 0 14px 40px rgba(14, 42, 87, .14);
  --radius: 10px;
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--body);
  background: var(--bg);
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ---------- 顶部信息条 ---------- */
.topbar {
  background: var(--blue-900);
  color: rgba(255, 255, 255, .82);
  font-size: 12.5px;
  line-height: 34px;
}
.topbar .container { display: flex; justify-content: space-between; align-items: center; }
.topbar-left { display: flex; gap: 26px; }
.topbar-left span, .topbar-right span { display: inline-flex; align-items: center; gap: 6px; white-space: nowrap; }
.topbar svg { flex: none; }
.topbar-right { display: flex; gap: 18px; align-items: center; }
.topbar a:hover { color: #fff; }

/* ---------- 导航 ---------- */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow .25s;
}
.header.scrolled { box-shadow: var(--shadow-md); }
.header .container { display: flex; align-items: center; justify-content: space-between; height: 72px; }

.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { flex: none; }
.brand-text { display: flex; flex-direction: column; }
.brand-name { font-size: 19px; font-weight: 700; color: var(--blue-800); letter-spacing: 1px; line-height: 1.25; }
.brand-sub { font-size: 9.5px; color: var(--muted); letter-spacing: 2.2px; text-transform: uppercase; line-height: 1.3; }

.nav { display: flex; align-items: center; gap: 4px; height: 100%; }
.nav a {
  position: relative; display: inline-flex; align-items: center; height: 100%;
  padding: 0 16px; font-size: 15px; color: var(--ink); font-weight: 500;
  transition: color .2s;
}
.nav a::after {
  content: ""; position: absolute; left: 16px; right: 16px; bottom: 0;
  height: 3px; border-radius: 2px 2px 0 0; background: var(--red);
  transform: scaleX(0); transition: transform .25s;
}
.nav a:hover { color: var(--blue-700); }
.nav a:hover::after, .nav a.active::after { transform: scaleX(1); }
.nav a.active { color: var(--blue-800); font-weight: 600; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 22px; border-radius: 6px; font-size: 14.5px; font-weight: 600;
  border: none; cursor: pointer; transition: all .22s; font-family: var(--font);
}
.btn-primary { background: var(--red); color: #fff; }
.btn-primary:hover { background: var(--red-dark); transform: translateY(-1px); box-shadow: 0 6px 16px rgba(210, 38, 48, .32); }
.btn-outline { background: transparent; color: #fff; border: 1.5px solid rgba(255, 255, 255, .65); }
.btn-outline:hover { background: rgba(255, 255, 255, .14); border-color: #fff; }
.btn-blue { background: var(--blue-800); color: #fff; }
.btn-blue:hover { background: var(--blue-700); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-ghost { background: var(--blue-50); color: var(--blue-800); border: 1px solid var(--blue-100); }
.btn-ghost:hover { background: var(--blue-100); }
.btn-sm { padding: 7px 16px; font-size: 13.5px; }

.nav-cta { margin-left: 10px; }

.menu-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.menu-toggle span { display: block; width: 24px; height: 2px; background: var(--blue-800); margin: 5px 0; transition: .25s; border-radius: 2px; }
.menu-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative; color: #fff; overflow: hidden;
  background: linear-gradient(120deg, var(--blue-900) 0%, var(--blue-800) 55%, var(--blue-700) 100%);
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, .10) 1px, transparent 1px);
  background-size: 26px 26px; opacity: .5;
}
.hero::after {
  content: ""; position: absolute; right: -140px; top: -140px; width: 520px; height: 520px;
  border-radius: 50%; border: 90px solid rgba(210, 38, 48, .16);
}
.hero .container { position: relative; z-index: 2; display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: center; padding-top: 76px; padding-bottom: 76px; }
.hero-tag {
  display: inline-flex; align-items: center; gap: 8px; font-size: 13px; letter-spacing: 1px;
  background: rgba(210, 38, 48, .18); border: 1px solid rgba(210, 38, 48, .5);
  color: #FFD9DB; padding: 5px 14px; border-radius: 100px; margin-bottom: 20px;
}
.hero h1 { font-size: 42px; line-height: 1.28; font-weight: 700; letter-spacing: 1px; margin-bottom: 18px; }
.hero h1 em { font-style: normal; color: #FF8A90; }
.hero p { font-size: 16.5px; color: rgba(255, 255, 255, .82); max-width: 560px; margin-bottom: 30px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 0; margin-top: 46px; border-top: 1px solid rgba(255, 255, 255, .18); padding-top: 26px; }
.hero-stats .stat { padding-right: 44px; margin-right: 44px; border-right: 1px solid rgba(255, 255, 255, .18); }
.hero-stats .stat:last-child { border-right: none; margin-right: 0; padding-right: 0; }
.hero-stats b { display: block; font-size: 32px; font-weight: 700; color: #fff; line-height: 1.2; }
.hero-stats b i { font-style: normal; font-size: 16px; color: #FF8A90; margin-left: 2px; }
.hero-stats span { font-size: 13px; color: rgba(255, 255, 255, .68); }

.hero-visual { position: relative; }
.hero-visual .frame {
  border-radius: 14px; overflow: hidden; box-shadow: 0 24px 60px rgba(0, 0, 0, .38);
  border: 1px solid rgba(255, 255, 255, .22); background: #fff;
}
.hero-visual img { width: 100%; height: 380px; object-fit: cover; }
.hero-badge {
  position: absolute; left: -22px; bottom: 26px; background: #fff; color: var(--blue-800);
  border-radius: 10px; padding: 12px 18px; box-shadow: var(--shadow-lg); display: flex; align-items: center; gap: 12px;
}
.hero-badge .dot { width: 40px; height: 40px; border-radius: 50%; background: var(--red); display: grid; place-items: center; flex: none; }
.hero-badge b { display: block; font-size: 14.5px; line-height: 1.3; }
.hero-badge span { font-size: 12px; color: var(--muted); }

/* ---------- 通用区块 ---------- */
.section { padding: 76px 0; }
.section-soft { background: var(--bg-soft); }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 48px; }
.section-head .kicker {
  display: inline-block; font-size: 13px; font-weight: 600; letter-spacing: 3px;
  color: var(--red); text-transform: uppercase; margin-bottom: 10px;
}
.section-head h2 { font-size: 30px; color: var(--blue-800); font-weight: 700; letter-spacing: 1px; margin-bottom: 14px; }
.section-head p { color: var(--muted); font-size: 15.5px; }
.section-head.left { text-align: left; margin-left: 0; }

/* ---------- 优势卡片 ---------- */
.adv-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.adv-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 34px 26px; text-align: center; transition: all .28s; position: relative; overflow: hidden;
}
.adv-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--red), var(--blue-700));
  transform: scaleX(0); transition: transform .3s;
}
.adv-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.adv-card:hover::before { transform: scaleX(1); }
.adv-icon {
  width: 64px; height: 64px; margin: 0 auto 18px; border-radius: 16px;
  background: var(--blue-50); display: grid; place-items: center; color: var(--blue-700);
  transition: all .28s;
}
.adv-card:hover .adv-icon { background: var(--red); color: #fff; transform: rotate(-6deg) scale(1.05); }
.adv-card h3 { font-size: 17.5px; color: var(--ink); margin-bottom: 8px; font-weight: 600; }
.adv-card p { font-size: 13.5px; color: var(--muted); line-height: 1.7; }

/* ---------- 产品分类 ---------- */
.cat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.cat-card {
  position: relative; border-radius: var(--radius); overflow: hidden; background: #fff;
  border: 1px solid var(--line); transition: all .3s; display: block;
}
.cat-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.cat-thumb { height: 170px; overflow: hidden; background: var(--blue-50); position: relative; }
.cat-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .45s; }
.cat-card:hover .cat-thumb img { transform: scale(1.07); }
.cat-thumb .ph { width: 100%; height: 100%; display: grid; place-items: center; background: linear-gradient(135deg, var(--blue-50), var(--blue-100)); }
.cat-thumb .ph svg { width: 76%; height: 76%; }
.cat-body { padding: 20px 22px 24px; }
.cat-body h3 { font-size: 17px; color: var(--ink); font-weight: 600; margin-bottom: 6px; }
.cat-body p { font-size: 13px; color: var(--muted); margin-bottom: 12px; line-height: 1.65; min-height: 44px; }
.cat-link { font-size: 13.5px; color: var(--red); font-weight: 600; display: inline-flex; align-items: center; gap: 5px; }
.cat-link:hover { gap: 9px; }
.cat-num {
  position: absolute; top: 14px; right: 14px; z-index: 2;
  background: rgba(8, 29, 61, .78); color: #fff; font-size: 12px;
  padding: 3px 10px; border-radius: 100px; letter-spacing: 1px;
}

/* ---------- 产品卡片 ---------- */
.prod-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.prod-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; transition: all .3s; display: flex; flex-direction: column;
}
.prod-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.prod-img { height: 210px; position: relative; overflow: hidden; background: var(--blue-50); }
.prod-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .45s; }
.prod-card:hover .prod-img img { transform: scale(1.06); }
.prod-img .ph { width: 100%; height: 100%; display: grid; place-items: center; background: linear-gradient(150deg, #EEF3FA, #DCE6F3); }
.prod-img .ph svg { width: 82%; height: 82%; }
.prod-brand {
  position: absolute; top: 12px; left: 12px; background: var(--red); color: #fff;
  font-size: 11.5px; font-weight: 600; padding: 3px 10px; border-radius: 4px; letter-spacing: .5px; z-index: 2;
}
.prod-brand.b-blue { background: var(--blue-800); }
.prod-brand.b-gray { background: #5A6B80; }
.prod-body { padding: 20px 22px 22px; flex: 1; display: flex; flex-direction: column; }
.prod-body h3 { font-size: 16.5px; color: var(--ink); font-weight: 600; margin-bottom: 4px; line-height: 1.45; }
.prod-model { font-size: 12.5px; color: var(--blue-600); font-family: Consolas, "Courier New", monospace; margin-bottom: 10px; letter-spacing: .3px; }
.prod-specs { font-size: 13px; color: var(--muted); line-height: 1.8; margin-bottom: 16px; flex: 1; }
.prod-specs li { position: relative; padding-left: 14px; }
.prod-specs li::before { content: ""; position: absolute; left: 0; top: 11px; width: 5px; height: 5px; border-radius: 50%; background: var(--red); }
.prod-foot { display: flex; justify-content: space-between; align-items: center; border-top: 1px dashed var(--line); padding-top: 14px; }
.prod-foot .price-hint { font-size: 12px; color: var(--muted); }

/* ---------- 应用领域 ---------- */
.app-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.app-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 22px; display: flex; align-items: center; gap: 16px; transition: all .28s;
}
.app-card:hover { border-color: var(--blue-600); box-shadow: var(--shadow-md); transform: translateY(-3px); }
.app-icon {
  width: 52px; height: 52px; flex: none; border-radius: 12px;
  background: linear-gradient(135deg, var(--blue-800), var(--blue-600));
  display: grid; place-items: center; color: #fff;
}
.app-card h3 { font-size: 16px; color: var(--ink); font-weight: 600; }
.app-card p { font-size: 12.5px; color: var(--muted); line-height: 1.6; }

/* ---------- 资质 / 数据条 ---------- */
.cert-strip { background: linear-gradient(120deg, var(--blue-900), var(--blue-700)); color: #fff; border-radius: 14px; padding: 44px 48px; display: grid; grid-template-columns: 1fr 1.4fr; gap: 44px; align-items: center; }
.cert-strip h3 { font-size: 24px; font-weight: 700; margin-bottom: 12px; letter-spacing: 1px; }
.cert-strip p { color: rgba(255, 255, 255, .78); font-size: 14.5px; }
.cert-list { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.cert-item { display: flex; gap: 12px; align-items: flex-start; background: rgba(255, 255, 255, .07); border: 1px solid rgba(255, 255, 255, .14); border-radius: 8px; padding: 14px 16px; }
.cert-item .ci { width: 34px; height: 34px; flex: none; border-radius: 8px; background: rgba(210, 38, 48, .85); display: grid; place-items: center; }
.cert-item b { font-size: 14px; display: block; line-height: 1.4; }
.cert-item span { font-size: 12px; color: rgba(255, 255, 255, .62); }

/* ---------- 新闻 ---------- */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.news-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; transition: all .3s; display: block; }
.news-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.news-body { padding: 24px 24px 22px; }
.news-date { display: inline-flex; align-items: center; gap: 7px; font-size: 12.5px; color: var(--muted); margin-bottom: 10px; }
.news-tag { font-size: 11.5px; color: var(--red); border: 1px solid rgba(210, 38, 48, .35); background: rgba(210, 38, 48, .06); padding: 1px 9px; border-radius: 4px; margin-right: 8px; }
.news-card h3 { font-size: 16.5px; color: var(--ink); font-weight: 600; line-height: 1.55; margin-bottom: 8px; transition: color .2s; }
.news-card:hover h3 { color: var(--blue-700); }
.news-card p { font-size: 13.5px; color: var(--muted); line-height: 1.75; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

/* ---------- CTA 横幅 ---------- */
.cta-band {
  position: relative; overflow: hidden; color: #fff;
  background: linear-gradient(115deg, var(--red-dark) 0%, var(--red) 45%, #E5484F 100%);
}
.cta-band::after {
  content: ""; position: absolute; right: -80px; bottom: -160px; width: 380px; height: 380px;
  border-radius: 50%; border: 70px solid rgba(255, 255, 255, .10);
}
.cta-band .container { position: relative; z-index: 2; display: flex; align-items: center; justify-content: space-between; gap: 36px; padding-top: 52px; padding-bottom: 52px; }
.cta-band h2 { font-size: 27px; font-weight: 700; margin-bottom: 8px; letter-spacing: 1px; }
.cta-band p { color: rgba(255, 255, 255, .85); font-size: 15px; }

/* ---------- 页脚 ---------- */
.footer { background: var(--blue-900); color: rgba(255, 255, 255, .72); }
.footer-main { display: grid; grid-template-columns: 1.5fr 1fr 1.2fr 1.3fr; gap: 44px; padding: 60px 0 44px; }
.footer h4 { color: #fff; font-size: 15.5px; font-weight: 600; margin-bottom: 20px; letter-spacing: 1px; position: relative; padding-bottom: 12px; }
.footer h4::after { content: ""; position: absolute; left: 0; bottom: 0; width: 28px; height: 2.5px; background: var(--red); border-radius: 2px; }
.footer .f-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.footer .f-brand .brand-name { color: #fff; }
.footer .f-brand .brand-sub { color: rgba(255, 255, 255, .45); }
.footer p { font-size: 13.5px; line-height: 1.9; }
.footer-links li { margin-bottom: 11px; }
.footer-links a { font-size: 13.5px; transition: all .2s; display: inline-flex; align-items: center; gap: 7px; }
.footer-links a::before { content: ""; width: 4px; height: 4px; background: var(--red); border-radius: 50%; flex: none; }
.footer-links a:hover { color: #fff; transform: translateX(3px); }
.footer-contact li { display: flex; gap: 11px; margin-bottom: 14px; font-size: 13.5px; line-height: 1.7; }
.footer-contact svg { flex: none; margin-top: 4px; color: var(--red); }
.footer-contact b { color: #fff; font-weight: 600; }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, .12); padding: 18px 0; font-size: 12.5px; color: rgba(255, 255, 255, .5); }
.footer-bottom .container { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

/* ---------- 页面标题（内页） ---------- */
.page-hero {
  position: relative; color: #fff; padding: 64px 0 56px; overflow: hidden;
  background: linear-gradient(115deg, var(--blue-900), var(--blue-700));
}
.page-hero::before {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, .09) 1px, transparent 1px);
  background-size: 24px 24px;
}
.page-hero .container { position: relative; z-index: 2; }
.page-hero h1 { font-size: 34px; font-weight: 700; letter-spacing: 2px; margin-bottom: 10px; }
.page-hero p { color: rgba(255, 255, 255, .75); font-size: 15px; }
.crumb { font-size: 13px; color: rgba(255, 255, 255, .6); margin-bottom: 14px; }
.crumb a:hover { color: #fff; }
.crumb i { font-style: normal; margin: 0 8px; }
.crumb b { color: #FF9BA1; font-weight: 500; }

/* ---------- 产品中心筛选 ---------- */
.filter-bar {
  display: flex; flex-wrap: wrap; gap: 10px; justify-content: center;
  margin-bottom: 40px;
}
.filter-btn {
  padding: 8px 20px; border-radius: 100px; border: 1px solid var(--line);
  background: #fff; color: var(--body); font-size: 14px; cursor: pointer;
  transition: all .22s; font-family: var(--font);
}
.filter-btn:hover { border-color: var(--blue-600); color: var(--blue-700); }
.filter-btn.active { background: var(--blue-800); border-color: var(--blue-800); color: #fff; font-weight: 600; }

.prod-section { margin-bottom: 64px; }
.prod-section:last-child { margin-bottom: 0; }
.prod-section-head { display: flex; align-items: center; gap: 16px; margin-bottom: 28px; }
.prod-section-head .bar { width: 5px; height: 26px; background: var(--red); border-radius: 3px; flex: none; }
.prod-section-head h3 { font-size: 21px; color: var(--blue-800); font-weight: 700; letter-spacing: 1px; }
.prod-section-head span { font-size: 13px; color: var(--muted); background: var(--blue-50); padding: 2px 12px; border-radius: 100px; }

/* ---------- 规格表 ---------- */
.spec-table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.spec-table { width: 100%; border-collapse: collapse; font-size: 13.5px; min-width: 640px; }
.spec-table th { background: var(--blue-800); color: #fff; font-weight: 600; padding: 12px 16px; text-align: left; white-space: nowrap; }
.spec-table td { padding: 11px 16px; border-bottom: 1px solid var(--line); color: var(--body); }
.spec-table tr:last-child td { border-bottom: none; }
.spec-table tbody tr:nth-child(even) { background: var(--blue-50); }
.spec-table tbody tr:hover { background: var(--blue-100); }
.spec-table td.mono { font-family: Consolas, monospace; color: var(--blue-700); white-space: nowrap; }

/* ---------- 关于我们 ---------- */
.about-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.about-img { border-radius: 14px; overflow: hidden; box-shadow: var(--shadow-lg); position: relative; }
.about-img img { width: 100%; height: 420px; object-fit: cover; }
.about-img .img-tag {
  position: absolute; left: 0; bottom: 0; right: 0; padding: 40px 28px 20px;
  background: linear-gradient(transparent, rgba(8, 29, 61, .92)); color: #fff;
}
.about-img .img-tag b { font-size: 18px; display: block; letter-spacing: 1px; }
.about-img .img-tag span { font-size: 12.5px; color: rgba(255, 255, 255, .75); }
.about-text h3 { font-size: 24px; color: var(--blue-800); font-weight: 700; margin-bottom: 18px; letter-spacing: 1px; }
.about-text p { margin-bottom: 16px; font-size: 15px; }
.about-quote { border-left: 4px solid var(--red); background: var(--blue-50); padding: 16px 20px; border-radius: 0 8px 8px 0; margin: 22px 0; font-size: 14.5px; color: var(--blue-800); }

/* 发展历程 */
.timeline { position: relative; padding-left: 34px; }
.timeline::before { content: ""; position: absolute; left: 8px; top: 6px; bottom: 6px; width: 2px; background: linear-gradient(var(--red), var(--blue-600)); }
.tl-item { position: relative; padding-bottom: 34px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: ""; position: absolute; left: -32px; top: 5px; width: 14px; height: 14px;
  border-radius: 50%; background: #fff; border: 3.5px solid var(--red); box-shadow: 0 0 0 4px rgba(210, 38, 48, .14);
}
.tl-year { font-size: 19px; font-weight: 700; color: var(--blue-800); margin-bottom: 4px; }
.tl-item p { font-size: 14px; color: var(--muted); line-height: 1.75; }

/* 文化价值观 */
.value-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.value-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 32px 28px; text-align: center; transition: all .28s; }
.value-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.value-card .vc-icon { width: 60px; height: 60px; margin: 0 auto 16px; border-radius: 50%; background: var(--blue-50); display: grid; place-items: center; color: var(--blue-700); }
.value-card:hover .vc-icon { background: var(--red); color: #fff; }
.value-card h3 { font-size: 17px; color: var(--ink); margin-bottom: 8px; font-weight: 600; }
.value-card p { font-size: 13.5px; color: var(--muted); }

/* 合作伙伴 */
.partner-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; }
.partner-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px 14px; text-align: center; transition: all .25s;
}
.partner-card:hover { border-color: var(--blue-600); box-shadow: var(--shadow-sm); transform: translateY(-3px); }
.partner-card b { display: block; font-size: 14.5px; color: var(--blue-800); margin-bottom: 3px; }
.partner-card span { font-size: 12px; color: var(--muted); }

/* ---------- 联系我们 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 44px; align-items: start; }
.contact-info-card { background: linear-gradient(150deg, var(--blue-800), var(--blue-900)); color: #fff; border-radius: 14px; padding: 38px 34px; }
.contact-info-card h3 { font-size: 21px; font-weight: 700; margin-bottom: 8px; letter-spacing: 1px; }
.contact-info-card > p { color: rgba(255, 255, 255, .72); font-size: 14px; margin-bottom: 28px; }
.ci-row { display: flex; gap: 15px; padding: 15px 0; border-bottom: 1px solid rgba(255, 255, 255, .12); }
.ci-row:last-child { border-bottom: none; }
.ci-row .ci-icon { width: 42px; height: 42px; flex: none; border-radius: 10px; background: rgba(210, 38, 48, .9); display: grid; place-items: center; }
.ci-row b { display: block; font-size: 12px; color: rgba(255, 255, 255, .6); font-weight: 500; margin-bottom: 3px; letter-spacing: 1px; }
.ci-row span, .ci-row a { font-size: 15px; color: #fff; font-weight: 600; line-height: 1.5; }
.ci-row a:hover { color: #FF9BA1; }

.form-card { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 36px 34px; box-shadow: var(--shadow-sm); }
.form-card h3 { font-size: 21px; color: var(--blue-800); font-weight: 700; margin-bottom: 6px; }
.form-card > p { font-size: 13.5px; color: var(--muted); margin-bottom: 26px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 13.5px; color: var(--ink); font-weight: 600; margin-bottom: 7px; }
.form-group label i { font-style: normal; color: var(--red); margin-left: 2px; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 11px 14px; border: 1.5px solid var(--line); border-radius: 8px;
  font-size: 14px; font-family: var(--font); color: var(--ink); background: #fff;
  transition: border-color .2s; outline: none;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: var(--blue-600); }
.form-group textarea { resize: vertical; min-height: 120px; }
.form-note { font-size: 12.5px; color: var(--muted); margin-top: 14px; text-align: center; }
.form-success {
  display: none; background: #EDF9F0; border: 1px solid #B8E4C6; color: #1E7A3C;
  border-radius: 8px; padding: 13px 16px; font-size: 14px; margin-bottom: 18px;
}

.map-frame { border-radius: 12px; overflow: hidden; border: 1px solid var(--line); box-shadow: var(--shadow-sm); margin-top: 24px; }
.map-frame iframe { width: 100%; height: 320px; border: 0; display: block; }

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed; right: 26px; bottom: 32px; width: 46px; height: 46px;
  border-radius: 50%; background: var(--blue-800); color: #fff; border: none;
  display: grid; place-items: center; cursor: pointer; box-shadow: var(--shadow-md);
  opacity: 0; visibility: hidden; transform: translateY(12px); transition: all .3s; z-index: 90;
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { background: var(--red); }

/* ---------- 滚动显现动画 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-d1 { transition-delay: .1s; }
.reveal-d2 { transition-delay: .2s; }
.reveal-d3 { transition-delay: .3s; }

/* ---------- 微信卡片 ---------- */
.wechat-card {
  margin-top: 28px;
  display: flex;
  align-items: center;
  gap: 36px;
  background: linear-gradient(115deg, #F1F8F3 0%, #E9F4EC 60%, #E4F0E9 100%);
  border: 1px solid #D3E5D9;
  border-radius: 14px;
  padding: 26px 34px;
  box-shadow: var(--shadow-sm);
}
.wechat-qr {
  flex: 0 0 auto;
  background: #fff;
  padding: 10px;
  border-radius: 12px;
  box-shadow: 0 8px 22px rgba(15, 60, 40, .14);
  line-height: 0;
}
.wechat-qr img { width: 186px; height: auto; border-radius: 6px; }
.wechat-text { flex: 1; min-width: 0; }
.wechat-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #07C160;
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 999px;
  letter-spacing: .5px;
}
.wechat-text h3 { margin: 13px 0 8px; font-size: 21px; color: var(--blue-900); }
.wechat-text p { color: var(--body); font-size: 15px; line-height: 1.75; }
.wechat-points { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 10px 22px; list-style: none; }
.wechat-points li {
  font-size: 14px;
  font-weight: 600;
  color: var(--blue-700);
  display: flex;
  align-items: center;
  gap: 7px;
}
.wechat-points li::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #07C160;
  flex: 0 0 auto;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .adv-grid, .cat-grid, .app-grid { grid-template-columns: repeat(2, 1fr); }
  .prod-grid, .news-grid { grid-template-columns: repeat(2, 1fr); }
  .partner-grid { grid-template-columns: repeat(3, 1fr); }
  .hero .container { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
  .about-grid, .contact-grid, .cert-strip { grid-template-columns: 1fr; }
  .footer-main { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 760px) {
  .topbar-left span:nth-child(2), .topbar-right span:nth-child(2) { display: none; }
  .nav {
    position: absolute; top: 72px; left: 0; right: 0; background: #fff;
    flex-direction: column; align-items: stretch; height: auto; padding: 8px 0;
    border-bottom: 1px solid var(--line); box-shadow: var(--shadow-md);
    display: none;
  }
  .nav.open { display: flex; }
  .nav a { height: 48px; padding: 0 24px; }
  .nav a::after { display: none; }
  .nav-cta { margin: 10px 24px 14px; }
  .menu-toggle { display: block; }
  .hero h1 { font-size: 30px; }
  .hero-stats { flex-wrap: wrap; gap: 18px; }
  .hero-stats .stat { border-right: none; padding-right: 0; margin-right: 22px; }
  .section { padding: 52px 0; }
  .section-head h2 { font-size: 24px; }
  .adv-grid, .cat-grid, .app-grid, .prod-grid, .news-grid, .value-grid, .form-row, .cert-list, .partner-grid { grid-template-columns: 1fr; }
  .cta-band .container { flex-direction: column; align-items: flex-start; }
  .footer-main { grid-template-columns: 1fr; gap: 34px; }
  .cert-strip { padding: 32px 26px; }
  .filter-bar { justify-content: flex-start; }
  .wechat-card { flex-direction: column; text-align: center; gap: 20px; padding: 24px 22px; }
  .wechat-qr img { width: 168px; }
  .wechat-points { justify-content: center; }
}

/* ===== 国产树脂（京讯树脂） ===== */
.resin-intro {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 32px;
  align-items: center;
  background: var(--blue-50);
  border: 1px solid var(--blue-100);
  border-radius: 16px;
  padding: 28px;
  margin-bottom: 36px;
}
.resin-intro-media { border-radius: 12px; overflow: hidden; box-shadow: var(--shadow-md); }
.resin-intro-media img { width: 100%; height: 100%; object-fit: cover; display: block; }
.resin-intro-text h4 { font-size: 22px; color: var(--blue-800); margin-bottom: 12px; letter-spacing: .5px; }
.resin-intro-text p { color: var(--body); line-height: 1.9; margin-bottom: 16px; }
.resin-feats { list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 10px 18px; }
.resin-feats li { position: relative; padding-left: 22px; font-size: 14.5px; color: var(--ink); }
.resin-feats li::before {
  content: ""; position: absolute; left: 2px; top: 7px;
  width: 8px; height: 8px; border-radius: 2px; background: var(--red); transform: rotate(45deg);
}
.resin-video { margin-bottom: 36px; }
.resin-video-title {
  font-size: 20px; color: var(--blue-800); margin-bottom: 16px;
  padding-left: 14px; border-left: 4px solid var(--red);
}
.video-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.video-item { margin: 0; background: #000; border-radius: 12px; overflow: hidden; box-shadow: var(--shadow-md); }
.video-item video { width: 100%; display: block; aspect-ratio: 16 / 9; background: #000; }
.video-item figcaption { color: #fff; font-size: 13.5px; padding: 10px 14px; background: var(--blue-900); }
.resin-app {
  margin-top: 36px; background: linear-gradient(120deg, var(--blue-900), var(--blue-700));
  border-radius: 16px; padding: 30px 34px; color: #fff;
}
.resin-app h4 { font-size: 19px; margin-bottom: 18px; color: #fff; }
.resin-app-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.resin-app-grid span {
  background: rgba(255,255,255,.10); border: 1px solid rgba(255,255,255,.18);
  border-radius: 8px; padding: 10px 12px; font-size: 14px; text-align: center;
}

/* 产品卡片底部按钮组 */
.prod-foot .foot-btns { display: flex; gap: 8px; flex: none; }
.prod-foot .btn-sm { padding: 6px 12px; font-size: 12.5px; }

/* 资料下载 */
.doc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.doc-item {
  display: flex; gap: 14px; align-items: center; text-decoration: none;
  background: #fff; border: 1px solid var(--line); border-radius: 12px;
  padding: 16px 18px; box-shadow: var(--shadow-sm); transition: all .22s ease;
}
.doc-item:hover { border-color: var(--blue-600); box-shadow: var(--shadow-md); transform: translateY(-3px); }
.doc-ico {
  flex: none; width: 46px; height: 46px; border-radius: 10px; display: grid; place-items: center;
  background: var(--red); color: #fff; font-size: 13px; font-weight: 700; letter-spacing: .5px;
}
.doc-item b { display: block; font-size: 15px; color: var(--blue-800); line-height: 1.45; }
.doc-item span { font-size: 12.5px; color: var(--muted); }

/* 证书展示 */
.cert-gallery { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 26px; }
.cert-fig {
  margin: 0; background: #fff; border: 1px solid var(--line); border-radius: 12px;
  overflow: hidden; box-shadow: var(--shadow-sm);
}
.cert-fig img { width: 100%; display: block; background: #fff; }
.cert-fig figcaption {
  font-size: 13.5px; color: var(--muted); padding: 12px 16px;
  border-top: 1px solid var(--line); background: #fafbfc;
}
.cert-fig figcaption b { display: block; color: var(--blue-800); font-size: 14.5px; margin-bottom: 2px; }

@media (max-width: 1080px) {
  .resin-intro { grid-template-columns: 1fr; }
  .resin-app-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 760px) {
  .resin-intro { padding: 20px; }
  .video-grid { grid-template-columns: 1fr; }
  .doc-grid { grid-template-columns: 1fr; }
  .cert-gallery { grid-template-columns: 1fr; }
  .resin-feats { grid-template-columns: 1fr; }
  .resin-app { padding: 22px; }
  .resin-app-grid { grid-template-columns: repeat(2, 1fr); }
}