/* ============================================================
   龙讯科技 · 房车二次改装官网  —  共享样式
   吉林省龙讯科技有限公司 · Swift Loong
   ============================================================ */
:root {
  --navy-900: #071a30;
  --navy-800: #0b2545;
  --navy-700: #13315c;
  --blue-600: #0b5fff;
  --blue-500: #2b7cff;
  --blue-100: #e8f1ff;
  --cyan-400: #22d3ee;
  --amber-500: #f59e0b;
  --green-500: #10b981;
  --ink-900: #101828;
  --ink-600: #475467;
  --ink-400: #98a2b3;
  --bg-soft: #f5f8fc;
  --line: #e4ebf3;
  --radius: 14px;
  --shadow-sm: 0 2px 10px rgba(11, 37, 69, .06);
  --shadow-md: 0 10px 30px rgba(11, 37, 69, .10);
  --shadow-lg: 0 20px 50px rgba(7, 26, 48, .16);
  --font: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, -apple-system, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: var(--font); color: var(--ink-900); background: #fff; line-height: 1.7; font-size: 16px; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img, svg { display: block; max-width: 100%; }
.container { width: min(1520px, 94%); margin: 0 auto; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { width: 42px; height: 42px; border-radius: 10px;
  background: linear-gradient(135deg, var(--navy-800), var(--blue-600));
  display: flex; align-items: center; justify-content: center; color: #fff;
  font-weight: 800; font-size: 18px; letter-spacing: -1px; }
.brand-logo { height: 46px; width: auto; display: block; }
.brand-mark-img { width: 44px; height: 44px; object-fit: contain; display: block; }
.brand-text b { display: block; font-size: 18px; line-height: 1.25; color: var(--navy-800); }
.brand-text span { display: block; font-size: 11px; color: var(--ink-400); letter-spacing: .12em; }
.nav-links { display: flex; align-items: center; gap: 34px; }
.nav-links a { font-size: 15px; color: var(--ink-600); font-weight: 500; padding: 6px 2px; border-bottom: 2px solid transparent; transition: .2s; }
.nav-links a:hover, .nav-links a.active { color: var(--blue-600); border-bottom-color: var(--blue-600); }
.nav-cta { background: var(--blue-600); color: #fff !important; padding: 10px 22px !important; border-radius: 8px; border: none !important; }
.nav-cta:hover { background: var(--navy-800); }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--navy-800); margin: 5px 0; transition: .3s; }

/* ---------- 按钮 ---------- */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 13px 30px; border-radius: 10px;
  font-size: 15px; font-weight: 600; transition: .25s; cursor: pointer; border: none; }
.btn-primary { background: linear-gradient(135deg, var(--blue-600), var(--navy-700)); color: #fff; box-shadow: 0 8px 20px rgba(11, 95, 255, .30); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(11, 95, 255, .4); }
.btn-ghost { background: rgba(255,255,255,.12); color: #fff; border: 1px solid rgba(255,255,255,.45); backdrop-filter: blur(4px); }
.btn-ghost:hover { background: rgba(255,255,255,.22); }
.btn-light { background: #fff; color: var(--navy-800); }
.btn-light:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-line { background: #fff; color: var(--navy-800); border: 1.5px solid var(--line); box-shadow: var(--shadow-sm); }
.btn-line:hover { border-color: var(--blue-600); color: var(--blue-600); transform: translateY(-2px); }
.act-row { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }

/* ---------- 通用区块 ---------- */
.section { padding: 90px 0; }
.section-soft { background: var(--bg-soft); }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.eyebrow { display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: .18em; color: var(--blue-600);
  background: var(--blue-100); border-radius: 100px; padding: 6px 18px; margin-bottom: 16px; }
.eyebrow.on-dark { color: var(--cyan-400); background: rgba(34, 211, 238, .12); }
.section-head h2 { font-size: 34px; color: var(--navy-800); line-height: 1.3; margin-bottom: 14px; }
.section-head p { color: var(--ink-600); font-size: 16px; }

/* ---------- 首页 Hero ---------- */
.hero { position: relative; background: linear-gradient(160deg, var(--navy-900) 0%, var(--navy-800) 45%, #0d3a7a 100%);
  color: #fff; overflow: hidden; }
.hero::before { content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(rgba(43, 124, 255, .25) 1px, transparent 1px);
  background-size: 34px 34px; opacity: .5; }
.hero-inner { position: relative; display: grid; grid-template-columns: 1fr 1.08fr; gap: 64px; align-items: center; padding: 100px 0 116px; }
.hero h1 { font-size: 52px; line-height: 1.24; font-weight: 800; margin-bottom: 22px; }
.hero h1 .grad { background: linear-gradient(90deg, var(--cyan-400), #7dd3fc); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.lead { font-size: 17px; color: rgba(255,255,255,.78); margin-bottom: 36px; max-width: 520px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 44px; margin-top: 52px; flex-wrap: wrap; }
.hero-stats .stat b { display: block; font-size: 30px; font-weight: 800; color: #fff; }
.hero-stats .stat b em { font-style: normal; color: var(--cyan-400); }
.hero-stats .stat span { font-size: 13px; color: rgba(255,255,255,.6); }
.hero-visual { position: relative; }
.hero-stage { position: relative; background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.14);
  border-radius: 20px; padding: 18px; backdrop-filter: blur(8px); box-shadow: var(--shadow-lg); overflow: hidden; }
.hero-slides { position: relative; aspect-ratio: 3 / 2; border-radius: 14px; overflow: hidden;
  background: linear-gradient(160deg, #06152b, #0e2a55); }
.hero-slide { position: absolute; inset: 0; opacity: 0; transition: opacity .8s ease; display: flex; align-items: center; justify-content: center; }
.hero-slide.active { opacity: 1; }
.hero-slide svg { width: 100%; height: 100%; }
.hero-caption { position: absolute; left: 18px; right: 18px; bottom: 14px; display: flex; align-items: center;
  justify-content: space-between; color: #fff; font-size: 12.5px; letter-spacing: .04em;
  background: linear-gradient(180deg, transparent, rgba(0,0,0,.55)); padding: 14px 8px 4px; margin: -14px -8px -4px;
  border-radius: 0 0 14px 14px; pointer-events: none; }
.hero-caption b { font-weight: 700; font-size: 14px; }
.hero-caption span { color: rgba(255,255,255,.7); }
.hero-dots { position: absolute; bottom: 12px; left: 50%; transform: translateX(-50%);
  display: flex; gap: 8px; z-index: 4; }
.hero-dots button { width: 26px; height: 4px; border-radius: 4px; background: rgba(255,255,255,.3); border: none; cursor: pointer; padding: 0; transition: .3s; }
.hero-dots button.active { background: var(--cyan-400); width: 38px; }
.hero-arrows { position: absolute; top: 50%; transform: translateY(-50%); width: 100%;
  display: flex; justify-content: space-between; padding: 0 10px; z-index: 4; pointer-events: none; }
.hero-arrows button { width: 36px; height: 36px; border-radius: 50%; background: rgba(255,255,255,.85); color: var(--navy-800);
  border: none; cursor: pointer; font-size: 18px; font-weight: 700; pointer-events: auto;
  display: flex; align-items: center; justify-content: center; box-shadow: var(--shadow-md); transition: .2s; }
.hero-arrows button:hover { background: #fff; transform: scale(1.08); }
.hero-badge { position: absolute; background: #fff; color: var(--navy-800); border-radius: 12px;
  padding: 10px 16px; font-size: 13px; font-weight: 700; box-shadow: var(--shadow-md); display: flex; align-items: center; gap: 8px; z-index: 3; }
.hero-badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--green-500); animation: pulse 1.6s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .35; } }
.hero-badge.b1 { top: -14px; right: 6%; }
.hero-badge.b2 { bottom: -16px; left: -4%; }

/* ---------- 产品卡 ---------- */
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.product-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 26px 28px; transition: .3s; position: relative; overflow: hidden; display: flex; flex-direction: column; }
.product-card::after { content: ""; position: absolute; left: 0; top: 0; width: 100%; height: 4px;
  background: linear-gradient(90deg, var(--blue-600), var(--cyan-400)); transform: scaleX(0); transform-origin: left; transition: .3s; }
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: transparent; }
.product-card:hover::after { transform: scaleX(1); }
.product-icon { width: 78px; height: 78px; border-radius: 16px; background: var(--blue-100);
  display: flex; align-items: center; justify-content: center; margin-bottom: 20px; }
.product-card h3 { font-size: 19px; color: var(--navy-800); margin-bottom: 6px; }
.product-card .en { font-size: 11px; letter-spacing: .1em; color: var(--ink-400); text-transform: uppercase; margin-bottom: 12px; }
.product-card p { font-size: 14px; color: var(--ink-600); flex: 1; }
.product-card .tags { display: flex; flex-wrap: wrap; gap: 6px; margin: 16px 0 18px; }
.tag { font-size: 12px; color: var(--blue-600); background: var(--blue-100); padding: 3px 10px; border-radius: 100px; font-weight: 600; }
.product-card .more { font-size: 14px; font-weight: 600; color: var(--blue-600); display: inline-flex; align-items: center; gap: 6px; }
.product-card .more:hover { gap: 10px; }

/* ---------- 优势区 ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.adv-card { background: #fff; border-radius: var(--radius); padding: 32px 28px; box-shadow: var(--shadow-sm); border: 1px solid var(--line); transition: .3s; }
.adv-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
.adv-num { font-size: 40px; font-weight: 800; color: var(--blue-100); line-height: 1; margin-bottom: 10px;
  -webkit-text-stroke: 1.4px var(--blue-600); }
.adv-card h3 { font-size: 18px; color: var(--navy-800); margin-bottom: 10px; }
.adv-card p { font-size: 14px; color: var(--ink-600); }

/* ---------- 应用场景 ---------- */
.scene-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.scene { position: relative; border-radius: var(--radius); overflow: hidden; min-height: 240px;
  display: flex; align-items: flex-end; padding: 26px; transition: .3s; }
.scene:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.scene .veil { position: absolute; inset: 0; }
.scene .txt { position: relative; color: #fff; }
.scene .txt h3 { font-size: 20px; margin-bottom: 6px; }
.scene .txt p { font-size: 13px; opacity: .85; }
.scene-1 .veil { background: linear-gradient(180deg, rgba(7,26,48,.15), rgba(7,26,48,.85)); }
.scene-2 .veil { background: linear-gradient(180deg, rgba(7,26,48,.15), rgba(7,26,48,.85)); }
.scene-3 .veil { background: linear-gradient(180deg, rgba(7,26,48,.15), rgba(7,26,48,.85)); }

/* ---------- 应用场景 · 内嵌产品宣传片 ---------- */
.scene-video { margin-bottom: 34px; }
.scene-video .sv-frame { position: relative; border-radius: 20px; overflow: hidden;
  background: var(--navy-900); border: 1px solid var(--line); box-shadow: var(--shadow-lg); }
.scene-video .sv-player { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover;
  background: var(--navy-900); }
.scene-video .sv-meta { display: flex; align-items: center; justify-content: space-between;
  gap: 30px; margin-top: 22px; }
.scene-video .sv-eyebrow { display: inline-block; font-size: 12px; font-weight: 700;
  letter-spacing: .16em; color: var(--blue-600); }
.scene-video .sv-txt h3 { font-size: 22px; color: var(--navy-800); margin: 4px 0 6px; }
.scene-video .sv-txt p { font-size: 14.5px; color: var(--ink-600); max-width: 940px; }
.scene-video .sv-meta .btn { flex: none; }
@media (max-width: 980px) {
  .scene-video .sv-meta { flex-direction: column; align-items: flex-start; gap: 16px; }
}
@media (max-width: 640px) {
  .scene-video .sv-frame { border-radius: 14px; }
  .scene-video .sv-txt h3 { font-size: 19px; }
}

/* ---------- 深色 CTA 横幅 ---------- */
.cta-band { background: linear-gradient(120deg, var(--navy-800), #0d3a7a 60%, #0b5fff); border-radius: 20px;
  padding: 64px 56px; color: #fff; display: grid; grid-template-columns: 1.3fr .7fr; gap: 40px; align-items: center;
  position: relative; overflow: hidden; }
.cta-band::before { content: ""; position: absolute; right: -80px; top: -80px; width: 300px; height: 300px;
  border-radius: 50%; background: radial-gradient(circle, rgba(34,211,238,.35), transparent 70%); }
.cta-band h2 { font-size: 30px; margin-bottom: 12px; }
.cta-band p { color: rgba(255,255,255,.78); font-size: 15px; }
.cta-band .act { text-align: right; position: relative; }

/* ---------- 产品详情页 ---------- */
.page-hero { background: linear-gradient(160deg, var(--navy-900), var(--navy-800) 60%, #0d3a7a); color: #fff; padding: 74px 0 84px; }
.page-hero h1 { font-size: 38px; margin-bottom: 12px; }
.page-hero .crumb { font-size: 13px; color: rgba(255,255,255,.55); margin-bottom: 22px; }
.page-hero .crumb a { color: rgba(255,255,255,.75); }
.page-hero .crumb a:hover { color: #fff; }
.page-hero p.lead { max-width: 660px; color: rgba(255,255,255,.78); font-size: 16px; }

.product-block { padding: 80px 0; }
.product-block:nth-child(even) { background: var(--bg-soft); }
.pb-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 76px; align-items: center; }
.pb-layout.reverse .pb-visual { order: 2; }
.pb-visual .frame { background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 34px; box-shadow: var(--shadow-md); }
.pb-info .eyebrow { margin-bottom: 14px; }
.pb-info h2 { font-size: 30px; color: var(--navy-800); margin-bottom: 8px; }
.pb-info .sub { color: var(--ink-400); font-size: 13px; letter-spacing: .08em; margin-bottom: 18px; text-transform: uppercase; }
.pb-info p.desc { color: var(--ink-600); font-size: 15px; margin-bottom: 22px; }
.feature-list { display: grid; gap: 14px; margin-bottom: 26px; }
.feature-list li { display: flex; gap: 12px; align-items: flex-start; font-size: 14.5px; color: var(--ink-600); }
.feature-list .fi { flex: none; width: 24px; height: 24px; border-radius: 7px; background: var(--blue-100); color: var(--blue-600);
  display: flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 800; margin-top: 2px; }
.feature-list b { color: var(--ink-900); }

/* 参数表 */
.spec-wrap { margin-top: 60px; }
.spec-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); }
.spec-table caption { caption-side: top; text-align: left; font-size: 22px; color: var(--navy-800); font-weight: 700; padding-bottom: 18px; }
.spec-table th { background: var(--navy-800); color: #fff; text-align: left; padding: 13px 22px; font-size: 14px; }
.spec-table td { padding: 12px 22px; border-bottom: 1px solid var(--line); font-size: 14px; color: var(--ink-600); }
.spec-table tr:nth-child(even) td { background: #fafcff; }
.spec-table td:first-child { font-weight: 600; color: var(--navy-700); width: 220px; }

/* ---------- 关于页 ---------- */
.about-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 60px; align-items: start; }
.about-grid .prose p { color: var(--ink-600); font-size: 15.5px; margin-bottom: 18px; text-align: justify; }
.fact-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px; box-shadow: var(--shadow-sm); }
.fact-card h3 { font-size: 17px; color: var(--navy-800); margin-bottom: 20px; }
.fact-list li { display: flex; justify-content: space-between; padding: 11px 0; border-bottom: 1px dashed var(--line); font-size: 14px; }
.fact-list li:last-child { border-bottom: none; }
.fact-list .k { color: var(--ink-400); }
.fact-list .v { font-weight: 600; color: var(--navy-800); }
.timeline { position: relative; margin-top: 20px; }
.timeline::before { content: ""; position: absolute; left: 7px; top: 6px; bottom: 6px; width: 2px; background: var(--line); }
.tl-item { position: relative; padding-left: 34px; margin-bottom: 30px; }
.tl-item::before { content: ""; position: absolute; left: 0; top: 6px; width: 16px; height: 16px; border-radius: 50%;
  background: #fff; border: 4px solid var(--blue-600); }
.tl-item b { display: block; color: var(--blue-600); font-size: 15px; margin-bottom: 4px; }
.tl-item p { font-size: 14px; color: var(--ink-600); }

/* ---------- 联系页 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.contact-item { display: flex; gap: 16px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.contact-item:last-child { border-bottom: none; }
.contact-item .ci { flex: none; width: 48px; height: 48px; border-radius: 12px; background: var(--blue-100);
  color: var(--blue-600); display: flex; align-items: center; justify-content: center; }
.contact-item h4 { font-size: 16px; color: var(--navy-800); margin-bottom: 4px; }
.contact-item p { font-size: 14px; color: var(--ink-600); }
.coop-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 44px; }
.coop-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 22px; text-align: center; transition: .3s; }
.coop-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.coop-card .ic { width: 58px; height: 58px; margin: 0 auto 16px; border-radius: 14px; background: linear-gradient(135deg, var(--blue-600), var(--cyan-400));
  color: #fff; display: flex; align-items: center; justify-content: center; }
.coop-card h4 { font-size: 16px; color: var(--navy-800); margin-bottom: 8px; }
.coop-card p { font-size: 13px; color: var(--ink-600); }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--navy-900); color: rgba(255,255,255,.72); padding: 64px 0 0; margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 44px; padding-bottom: 48px; }
.footer-grid h4 { color: #fff; font-size: 15px; margin-bottom: 18px; }
.footer-grid p, .footer-grid a { font-size: 13.5px; line-height: 2.1; }
.footer-grid a:hover { color: var(--cyan-400); }
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 18px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.08); padding: 20px 0; display: flex; justify-content: space-between;
  font-size: 12.5px; color: rgba(255,255,255,.4); flex-wrap: wrap; gap: 8px; }

/* ---------- 微信优先联系卡 ---------- */
.wx-card { display:flex; gap:24px; align-items:center; background:linear-gradient(135deg,var(--navy-800),var(--navy-700));
  border-radius:var(--radius); padding:26px 28px; margin-bottom:18px; box-shadow:0 12px 30px rgba(11,37,69,.18); }
.wx-qr img { display:block; width:180px; height:auto; border-radius:10px; background:#fff; padding:6px; }
.wx-eyebrow { display:inline-block; font-size:11px; letter-spacing:.14em; color:#22d3ee;
  border:1px solid rgba(34,211,238,.45); padding:4px 10px; border-radius:999px; margin-bottom:10px; }
.wx-info h3 { color:#fff; font-size:22px; margin-bottom:8px; }
.wx-info p { color:rgba(255,255,255,.78); font-size:14px; line-height:1.7; }
.wx-badge { margin-top:12px; display:inline-block; font-size:12.5px; color:#22d3ee;
  background:rgba(34,211,238,.12); border:1px solid rgba(34,211,238,.35); padding:6px 12px; border-radius:8px; }
@media (max-width:720px){ .wx-card{flex-direction:column; text-align:center;} .wx-qr img{width:200px;} }

/* ---------- 系列内子导航 ---------- */
.sub-nav { display:flex; flex-wrap:wrap; gap:10px; margin-bottom:22px; padding:10px 12px;
  background:rgba(11,95,255,.06); border:1px solid rgba(11,95,255,.14); border-radius:12px; }
.sub-nav a { font-size:13px; font-weight:600; color:var(--navy-700); padding:7px 14px;
  border-radius:999px; background:#fff; border:1px solid rgba(11,37,69,.10); transition:.18s; }
.sub-nav a:hover { border-color:var(--blue-600); color:var(--blue-600); }
.sub-nav a.on { background:linear-gradient(135deg,var(--blue-600),var(--navy-700)); color:#fff; border-color:transparent; }
.section section-soft .sub-nav { background:rgba(11,95,255,.05); }

/* ---------- 工厂实拍 ---------- */
.factory-banner { margin:0 0 22px; background:#fff; border:1px solid var(--line); border-radius:16px; overflow:hidden; box-shadow:var(--shadow-md); }
.factory-banner img { display:block; width:100%; max-height:560px; object-fit:cover; }
.factory-banner figcaption { padding:12px 16px; font-size:13px; color:var(--ink-600); border-top:1px solid var(--line); }
.factory-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:22px; }
.factory-item { margin:0; background:#fff; border:1px solid var(--line); border-radius:16px; overflow:hidden; box-shadow:var(--shadow-md); }
.factory-item img { display:block; width:100%; height:100%; min-height:280px; object-fit:cover; }
.factory-item figcaption { padding:12px 16px; font-size:13px; color:var(--ink-600); border-top:1px solid var(--line); }
@media (max-width:1100px){ .factory-grid{grid-template-columns:repeat(2,1fr);} }
@media (max-width:860px){ .factory-grid{grid-template-columns:1fr;} .factory-item img{min-height:0;} .factory-banner img{max-height:320px;} }

.factory-cta { display:flex; flex-wrap:wrap; align-items:center; gap:18px; margin-top:26px; }
.factory-cta .hint { margin-top:0; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .scene-grid, .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .hero-inner { grid-template-columns: 1fr; padding: 70px 0 80px; }
  .pb-layout, .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .pb-layout.reverse .pb-visual { order: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .cta-band { grid-template-columns: 1fr; text-align: left; }
  .cta-band .act { text-align: left; }
}
@media (max-width: 640px) {
  .grid-4, .scene-grid, .grid-3, .coop-cards { grid-template-columns: 1fr; }
  .hero h1 { font-size: 32px; }
  .section { padding: 64px 0; }
  .section-head h2 { font-size: 26px; }
  .nav-links { position: absolute; top: 72px; left: 0; right: 0; background: #fff; flex-direction: column;
    gap: 0; padding: 0; border-bottom: 1px solid var(--line); display: none; box-shadow: var(--shadow-md); }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 15px 6%; border-bottom: 1px solid var(--line); width: 100%; }
  .nav-links .nav-cta { margin: 14px 6%; text-align: center; justify-content: center; }
  .nav-toggle { display: block; }
  .spec-table td:first-child { width: 120px; }
  .footer-grid { grid-template-columns: 1fr; }
}

/* ---------- 动画 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ---------- 宽屏 / 超宽屏适配 ---------- */
@media (min-width: 1600px) {
  .container { width: min(1680px, 92%); }
  .hero-inner { grid-template-columns: 1fr 1.12fr; gap: 76px; padding: 112px 0 128px; }
  .hero h1 { font-size: 58px; }
  .hero p.lead { font-size: 18px; max-width: 580px; }
  .section { padding: 108px 0; }
  .section-head { max-width: 820px; margin-bottom: 64px; }
  .section-head h2 { font-size: 40px; }
  .pb-layout { gap: 96px; }
  .pb-info h2 { font-size: 34px; }
  .spec-table td, .spec-table th { padding-top: 15px; padding-bottom: 15px; }
}
@media (min-width: 1920px) {
  .container { width: min(1880px, 90%); }
  .grid-4 { gap: 30px; }
  .scene-grid, .grid-3 { gap: 30px; }
}

/* ============================================================
   产品专项页（DCDC 等）
   ============================================================ */

/* ----- 锚点导航条 ----- */
.chip-nav { position: sticky; top: 72px; z-index: 40; background: rgba(255,255,255,.94);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.chip-nav .container { display: flex; gap: 10px; align-items: center; overflow-x: auto; padding: 14px 0; }
.chip-nav a { flex: none; font-size: 14px; font-weight: 600; color: var(--ink-600); padding: 8px 18px;
  border-radius: 100px; background: var(--bg-soft); border: 1px solid var(--line); transition: .25s; }
.chip-nav a:hover { color: var(--blue-600); border-color: var(--blue-600); background: #fff; }
.chip-nav a.hot { background: linear-gradient(135deg, var(--blue-600), var(--navy-700)); color: #fff; border-color: transparent; }

/* ----- 型号卡 ----- */
.model-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.model-card { position: relative; background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 32px 28px 30px; box-shadow: var(--shadow-sm); transition: .3s; overflow: hidden; }
.model-card::after { content: ""; position: absolute; left: 0; top: 0; height: 4px; width: 100%;
  background: linear-gradient(90deg, var(--blue-600), var(--cyan-400)); transform: scaleX(0); transform-origin: left; transition: .35s; }
.model-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: transparent; }
.model-card:hover::after { transform: scaleX(1); }
.model-card .mc-tag { display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: .1em;
  color: var(--blue-600); background: var(--blue-100); padding: 4px 12px; border-radius: 100px; margin-bottom: 16px; }
.model-card h3 { font-size: 26px; color: var(--navy-800); letter-spacing: .01em; margin-bottom: 6px; }
.model-card .mc-sub { font-size: 12px; letter-spacing: .08em; color: var(--ink-400); text-transform: uppercase; margin-bottom: 16px; }
.model-card p { font-size: 14px; color: var(--ink-600); margin-bottom: 18px; }
.model-card .mc-list { display: grid; gap: 9px; }
.model-card .mc-list li { display: flex; gap: 9px; font-size: 13.5px; color: var(--ink-600); align-items: flex-start; }
.model-card .mc-list .fi { flex: none; width: 18px; height: 18px; border-radius: 5px; background: var(--blue-100);
  color: var(--blue-600); font-size: 10px; font-weight: 800; display: flex; align-items: center; justify-content: center; margin-top: 2px; }
.model-card.flagship { border-color: rgba(11,95,255,.35); box-shadow: 0 12px 32px rgba(11,95,255,.14); }

/* ----- 小字提示 ----- */
.hint { font-size: 13px; color: var(--ink-400); margin-top: 14px; line-height: 1.75; }
.hint b { color: var(--ink-600); }

/* ----- 产品中心里的型号快捷入口 ----- */
.model-chips { display: flex; flex-wrap: wrap; gap: 10px; margin: 4px 0 26px; }
.mchip { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 700;
  color: var(--navy-800); background: #fff; border: 1.5px solid var(--line); border-radius: 100px;
  padding: 9px 18px; transition: .25s; }
.mchip em { font-style: normal; font-size: 11px; font-weight: 700; color: var(--blue-600);
  background: var(--blue-100); padding: 2px 8px; border-radius: 100px; }
.mchip:hover { border-color: var(--blue-600); color: var(--blue-600); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.mchip.hot { background: linear-gradient(135deg, var(--blue-600), var(--navy-700)); color: #fff; border-color: transparent; }
.mchip.hot em { background: rgba(255,255,255,.22); color: #fff; }
.mchip.hot:hover { color: #fff; }

/* ----- 双表并排 ----- */
.split-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: start; }
.split-2 .spec-table td:first-child { width: 168px; }

/* ----- 数据小卡 ----- */
.kpi-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; margin-bottom: 46px; }
.kpi { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 24px; box-shadow: var(--shadow-sm); }
.kpi b { display: block; font-size: 30px; font-weight: 800; color: var(--navy-800); line-height: 1.1; }
.kpi b em { font-style: normal; font-size: 15px; color: var(--blue-600); margin-left: 3px; }
.kpi span { display: block; font-size: 13px; color: var(--ink-400); margin-top: 8px; }

/* ----- 安装调试视频 ----- */
.video-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.video-card { position: relative; background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow-sm); cursor: pointer; transition: .3s; text-align: left;
  padding: 0; border-width: 1px; display: block; width: 100%; font: inherit; }
.video-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.video-card .poster { position: relative; aspect-ratio: 16 / 9; overflow: hidden;
  background: linear-gradient(150deg, #0a1f3d, #12325e 55%, #0d3a7a); }
.video-card .poster svg { width: 100%; height: 100%; display: block; }
.video-card .play { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; }
.video-card .play i { width: 74px; height: 74px; border-radius: 50%; background: rgba(255,255,255,.92);
  display: flex; align-items: center; justify-content: center; box-shadow: 0 10px 30px rgba(0,0,0,.3); transition: .3s; }
.video-card .play i::before { content: ""; width: 0; height: 0; border-style: solid;
  border-width: 13px 0 13px 22px; border-color: transparent transparent transparent var(--blue-600); margin-left: 6px; }
.video-card:hover .play i { transform: scale(1.1); background: #fff; }
.video-card .no { position: absolute; left: 20px; top: 20px; font-size: 12px; font-weight: 800; letter-spacing: .12em;
  color: #fff; background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.3);
  padding: 5px 12px; border-radius: 100px; backdrop-filter: blur(4px); }
.video-card .time { position: absolute; right: 20px; bottom: 18px; font-size: 12px; color: rgba(255,255,255,.85);
  background: rgba(0,0,0,.45); padding: 4px 10px; border-radius: 6px; }
.video-card .vc-body { padding: 24px 26px 26px; }
.video-card .vc-body h3 { font-size: 18px; color: var(--navy-800); margin-bottom: 8px; }
.video-card .vc-body p { font-size: 13.5px; color: var(--ink-600); }
.video-card .vc-body .vc-meta { margin-top: 12px; font-size: 12px; color: var(--ink-400); letter-spacing: .04em; }

/* ----- 视频弹窗 ----- */
.video-modal { position: fixed; inset: 0; z-index: 200; display: none; align-items: center; justify-content: center;
  background: rgba(4,10,22,.86); backdrop-filter: blur(6px); padding: 4vh 4vw; }
.video-modal.open { display: flex; }
.video-modal .vm-box { width: min(1180px, 100%); background: #0a1424; border-radius: 16px; overflow: hidden;
  border: 1px solid rgba(255,255,255,.14); box-shadow: 0 30px 80px rgba(0,0,0,.6); }
.video-modal .vm-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 16px 22px;
  border-bottom: 1px solid rgba(255,255,255,.1); }
.video-modal .vm-head h4 { color: #fff; font-size: 16px; font-weight: 600; }
.video-modal .vm-close { background: rgba(255,255,255,.12); border: none; color: #fff; width: 36px; height: 36px;
  border-radius: 9px; cursor: pointer; font-size: 18px; line-height: 1; }
.video-modal .vm-close:hover { background: rgba(255,255,255,.24); }
.video-modal .vm-stage { position: relative; aspect-ratio: 16 / 9; background: #060d1a; }
.video-modal video { width: 100%; height: 100%; display: block; background: #060d1a; }
.video-modal .vm-empty { position: absolute; inset: 0; display: none; flex-direction: column; align-items: center;
  justify-content: center; gap: 14px; text-align: center; padding: 30px; color: rgba(255,255,255,.72); }
.video-modal .vm-empty.show { display: flex; }
.video-modal .vm-empty .ve-ic { width: 62px; height: 62px; border-radius: 16px; background: rgba(255,255,255,.1);
  display: flex; align-items: center; justify-content: center; }
.video-modal .vm-empty h5 { color: #fff; font-size: 17px; font-weight: 600; }
.video-modal .vm-empty p { font-size: 13.5px; max-width: 560px; line-height: 1.8; }
.video-modal .vm-empty code { background: rgba(255,255,255,.12); padding: 3px 9px; border-radius: 6px;
  font-size: 12.5px; color: #7dd3fc; }

@media (max-width: 1024px) {
  .model-grid { grid-template-columns: 1fr; }
  .video-grid { grid-template-columns: 1fr; }
  .split-2 { grid-template-columns: 1fr; gap: 26px; }
  .kpi-row { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .kpi-row { grid-template-columns: 1fr; }
  .chip-nav { top: 72px; }
  .chip-nav .container { gap: 8px; }
  .chip-nav a { padding: 7px 14px; font-size: 13px; }
}

/* ============================================================
   1688 官方店铺 · 采购入口 & 产品总览卡
   ============================================================ */
.nav-links a.nav-shop { color: var(--blue-600); display: inline-flex; align-items: center; gap: 5px; }
.nav-links a.nav-shop::after { content: "↗"; font-size: 12px; opacity: .85; }

.shop-band { display: grid; grid-template-columns: 1.45fr .55fr; gap: 34px; align-items: center;
  background: linear-gradient(120deg, var(--navy-800), #123a72 58%, #0b5fff); border-radius: 20px;
  padding: 42px 48px; color: #fff; position: relative; overflow: hidden; }
.shop-band::before { content: ""; position: absolute; right: -70px; bottom: -100px; width: 320px; height: 320px;
  background: radial-gradient(circle, rgba(34,211,238,.38), transparent 70%); }
.shop-band h2 { font-size: 29px; margin-bottom: 12px; }
.shop-band p { color: rgba(255,255,255,.82); font-size: 14.5px; }
.shop-band .sb-actions { display: flex; flex-direction: column; gap: 12px; align-items: flex-end; position: relative; }
.shop-band .sb-note { font-size: 12.5px; color: rgba(255,255,255,.62); text-align: right; line-height: 1.7; }
.shop-tag { display: inline-flex; align-items: center; gap: 7px; font-size: 12.5px; font-weight: 700;
  color: var(--blue-600); background: rgba(11,95,255,.08); border: 1px solid rgba(11,95,255,.22);
  padding: 5px 13px; border-radius: 999px; margin-bottom: 14px; }
.shop-row { display: flex; gap: 10px; flex-wrap: wrap; }

.ov-card { display: flex; flex-direction: column; }
.ov-thumb { height: 150px; border-radius: 13px; background: linear-gradient(150deg, #eef4fd, #dde8f8);
  display: flex; align-items: center; justify-content: center; margin-bottom: 18px; overflow: hidden; }
.ov-thumb svg { width: 100%; height: 100%; }
.ov-kv { display: grid; gap: 8px; margin: 14px 0 18px; }
.ov-kv div { display: flex; justify-content: space-between; gap: 12px; font-size: 13px; color: var(--ink-600);
  border-bottom: 1px dashed var(--line); padding-bottom: 7px; }
.ov-kv div b { color: var(--navy-800); font-weight: 700; }
.ov-actions { display: flex; gap: 10px; margin-top: auto; flex-wrap: wrap; }
.ov-actions .btn { padding: 10px 18px; font-size: 14px; }

@media (max-width: 1024px) {
  .shop-band { grid-template-columns: 1fr; padding: 32px 28px; }
  .shop-band .sb-actions { align-items: flex-start; }
  .shop-band .sb-note { text-align: left; }
}
@media (max-width: 640px) {
  .ov-actions { flex-direction: column; }
  .ov-actions .btn { width: 100%; text-align: center; }
}

/* ============================================================
   库伦计 Blue Shunt 系列 · 两代大类 & 型号矩阵
   ============================================================ */
.gen-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }

.table-wrap { width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }
.table-wrap .spec-table { min-width: 820px; margin-bottom: 0; }

.mx-badge { display: inline-block; font-size: 11.5px; font-weight: 800; letter-spacing: .06em;
  padding: 3px 10px; border-radius: 7px; white-space: nowrap; }
.mx-badge.g1 { background: rgba(100,116,139,.14); color: #475569; }
.mx-badge.g2 { background: rgba(11,95,255,.11); color: var(--blue-600); }
.mx-cell { display: flex; align-items: center; gap: 10px; }
.mx-cell b { font-weight: 700; color: var(--navy-800); }
.spec-table tr.hot-row td { background: rgba(11,95,255,.055); }
.spec-table td .dim { color: var(--ink-400); font-size: 12.5px; }

.legend { display: flex; flex-wrap: wrap; gap: 10px 22px; margin-top: 20px; }
.legend span { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--ink-500); }
.legend i { width: 10px; height: 10px; border-radius: 3px; display: inline-block; }

@media (max-width: 900px) {
  .gen-grid { grid-template-columns: 1fr; }
}

/* ---------- CiDC 系列徽标 ---------- */
.mc-tag.ci { background: linear-gradient(135deg,#f59e0b,#fbbf24); color:#3b1d00; }
.fi.pending { display:inline-flex; align-items:center; justify-content:center;
  width:18px; height:18px; border-radius:50%; background:rgba(245,158,11,.15);
  color:#f59e0b; font-weight:800; font-size:14px; line-height:1; flex-shrink:0; }

/* ---------- CiDC 系列徽标 ---------- */
.mc-tag.ci { background: linear-gradient(135deg,#f59e0b,#fbbf24); color:#3b1d00; }
.fi.pending { display:inline-flex; align-items:center; justify-content:center;
  width:18px; height:18px; border-radius:50%; background:rgba(245,158,11,.15);
  color:#f59e0b; font-weight:800; font-size:14px; line-height:1; flex-shrink:0; }