/* =========================================================
   淄博四方给水设备有限公司 - 企业官网设计系统
   风格：蓝色科技感 / 简约大气 / 节能·环保主题
   ========================================================= */

:root {
  /* 蓝色主色系 */
  --blue-900: #061a35;
  --blue-800: #0a2540;
  --blue-700: #0d2e54;
  --blue-600: #11487f;
  --primary:  #0a6cff;
  --primary-light: #4d9fff;
  --cyan:     #00c2ff;
  --accent:   #00d68f;   /* 节能环保绿 */
  --accent-soft: #18e0a0;

  /* 中性色 */
  --white:    #ffffff;
  --bg-light: #f4f8fd;
  --bg-soft:  #eaf1fb;
  --text-dark: #14233b;
  --text-muted: #5b6b82;
  --border:   #dbe6f3;

  /* 阴影 / 圆角 */
  --shadow-sm: 0 4px 16px rgba(10, 37, 64, 0.06);
  --shadow-md: 0 12px 40px rgba(10, 37, 64, 0.10);
  --shadow-lg: 0 24px 70px rgba(10, 37, 64, 0.16);
  --radius: 16px;
  --radius-sm: 10px;

  --maxw: 1240px;
  --nav-h: 74px;
  --topbar-h: 38px;

  /* 文本主色别名（部分组件已引用，避免回退不一致） */
  --text: var(--text-dark);
  /* 间距刻度（统一节奏） */
  --sp-1: 8px;  --sp-2: 16px; --sp-3: 24px; --sp-4: 32px; --sp-5: 48px; --sp-6: 64px;
  --section-pad: 100px;
  /* 基础字号 */
  --fs-base: 16px;

  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui,
    -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* ---------- Reset ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  font-size: var(--fs-base);
  color: var(--text-dark);
  background: var(--white);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
/* 键盘可达性：清晰的焦点环 */
a:focus-visible, button:focus-visible, .btn:focus-visible,
input:focus-visible, textarea:focus-visible, select:focus-visible {
  outline: 3px solid rgba(10,108,255,.45); outline-offset: 2px; border-radius: 6px;
}
/* 锚点跳转时为固定导航留出空间 */
[id], [name] { scroll-margin-top: calc(var(--nav-h) + var(--topbar-h) + 24px); }
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
section { position: relative; }
.section-pad { padding: var(--section-pad) 0; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 28px; border-radius: 999px;
  font-size: 15px; font-weight: 600; cursor: pointer;
  border: 1.5px solid transparent; transition: all .3s ease; white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(120deg, var(--primary), var(--cyan));
  color: #fff; box-shadow: 0 10px 26px rgba(10,108,255,.32);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 16px 34px rgba(10,108,255,.42); }
.btn-ghost { border-color: rgba(255,255,255,.45); color: #fff; }
.btn-ghost:hover { background: rgba(255,255,255,.12); border-color: #fff; }
.btn-outline {
  border-color: var(--primary); color: var(--primary); background: transparent;
}
.btn-outline:hover { background: var(--primary); color: #fff; }

/* ---------- 顶部导航 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  display: flex; flex-direction: column;
  transition: all .35s ease;
  background: transparent;
}
.nav.scrolled {
  background: rgba(6,26,53,.92);
  backdrop-filter: blur(12px);
  box-shadow: 0 6px 24px rgba(0,0,0,.18);
}
.nav .container { display: flex; align-items: center; justify-content: space-between; min-height: var(--nav-h); width: 100%; }

/* ---------- 顶部滚动品牌条 ---------- */
.topbar {
  height: var(--topbar-h);
  background: linear-gradient(90deg, var(--blue-900), var(--blue-700) 55%, var(--blue-900));
  border-bottom: 1px solid rgba(255,255,255,.10);
  display: flex; align-items: center; overflow: hidden;
}
.marquee { width: 100%; overflow: hidden; -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); }
.marquee__track {
  display: inline-flex; white-space: nowrap;
  animation: marquee 26s linear infinite; will-change: transform;
}
.marquee__track span {
  color: rgba(255,255,255,.92);
  font-size: 13.5px; font-weight: 500; letter-spacing: 2px;
  padding: 0 4px;
}
.marquee__track b { color: var(--accent); font-weight: 700; margin: 0 14px; font-style: normal; }
.topbar:hover .marquee__track { animation-play-state: paused; }
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }
.brand { display: flex; align-items: center; gap: 12px; color: #fff; }
.brand .logo {
  width: 40px; height: 40px; flex: none;
  display: grid; place-items: center;
  border-radius: 10px;
  background: #006AA7;
  overflow: hidden;
  box-shadow: 0 4px 14px rgba(0,106,167,.45);
}
.brand .logo svg { width: 24px; height: 24px; }
.brand .logo img { width: 100%; height: 100%; object-fit: contain; }
.brand .name { font-size: 17px; font-weight: 700; letter-spacing: .5px; line-height: 1.2; }
.brand .name small { display: block; font-size: 11px; font-weight: 400; opacity: .8; letter-spacing: 1.5px; }

.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-links a {
  color: rgba(255,255,255,.85); padding: 9px 16px; border-radius: 8px;
  font-size: 15px; font-weight: 500; transition: all .25s ease; position: relative;
}
.nav.scrolled .nav-links a { color: rgba(255,255,255,.9); }
.nav-links a:hover { color: #fff; background: rgba(255,255,255,.10); }
.nav-links a.active { color: #fff; }
.nav-links a.active::after {
  content: ""; position: absolute; left: 16px; right: 16px; bottom: 4px; height: 2px;
  background: var(--cyan); border-radius: 2px;
}
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; flex-direction: column; gap: 5px; }
.nav-toggle span { width: 26px; height: 2px; background: #fff; border-radius: 2px; transition: .3s; }

/* ---------- Hero ---------- */
.hero {
  position: relative; min-height: 100vh; display: flex; align-items: center;
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(0,194,255,.25), transparent 60%),
    radial-gradient(900px 500px at 10% 110%, rgba(10,108,255,.30), transparent 60%),
    linear-gradient(160deg, var(--blue-900), var(--blue-700) 55%, var(--blue-600));
  color: #fff; overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; z-index: 0; }
.hero-scrim {
  position: absolute; inset: 0; z-index: 1; pointer-events: none;
  background:
    linear-gradient(105deg, rgba(5,18,42,.92) 0%, rgba(5,18,42,.80) 36%, rgba(5,18,42,.46) 64%, rgba(5,18,42,.18) 100%),
    linear-gradient(180deg, rgba(5,18,42,.34) 0%, rgba(5,18,42,0) 42%, rgba(5,18,42,.55) 100%);
}
.hero .grid-bg {
  position: absolute; inset: 0; opacity: .28; z-index: 2;
  background-image:
    linear-gradient(rgba(255,255,255,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.06) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 35%, #000 30%, transparent 75%);
}
.hero .glow { position: absolute; border-radius: 50%; filter: blur(70px); z-index: 2; }
.hero .glow.a { width: 380px; height: 380px; background: rgba(0,194,255,.18); top: 12%; right: 8%; }
.hero .glow.b { width: 300px; height: 300px; background: rgba(0,214,143,.12); bottom: 10%; left: 6%; }
.hero .container { position: relative; z-index: 3; padding-top: calc(var(--nav-h) + var(--topbar-h)); }
.hero-inner { max-width: 760px; }
.hero-tag {
  display: inline-flex; align-items: center; gap: 8px; padding: 7px 16px; border-radius: 999px;
  background: rgba(255,255,255,.10); border: 1px solid rgba(255,255,255,.22);
  font-size: 13px; letter-spacing: .5px; margin-bottom: 22px; backdrop-filter: blur(6px);
}
.hero-tag .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 12px var(--accent); }
.hero h1 {
  font-size: clamp(30px, 5vw, 50px); line-height: 1.2; font-weight: 800; letter-spacing: .5px; margin-bottom: 20px;
}
.hero h1 .grad {
  background: linear-gradient(100deg, #7fd4ff, var(--cyan));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.lead { font-size: 18px; color: rgba(255,255,255,.82); max-width: 540px; margin-bottom: 32px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 38px; margin-top: 46px; flex-wrap: wrap; }
.hero-stats .item .num {
  font-size: 34px; font-weight: 800;
  background: linear-gradient(120deg, #fff, var(--cyan)); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-stats .item .lbl { font-size: 13px; color: rgba(255,255,255,.7); letter-spacing: .5px; }

/* Hero 信任标签（厂区形象点缀） */
.hero-badges { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 40px; }
.f-badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13px; font-weight: 700; letter-spacing: .5px; padding: 9px 16px; border-radius: 999px;
  background: rgba(255,255,255,.92); color: var(--primary);
  border: 1px solid rgba(255,255,255,.55);
  box-shadow: 0 10px 24px rgba(0,0,0,.22); backdrop-filter: blur(4px);
}
.f-badge.b2 { background: linear-gradient(135deg, var(--accent), var(--accent-soft)); color: #fff; border-color: transparent; }

/* 波浪分隔 */
.wave { position: absolute; left: 0; right: 0; bottom: -1px; line-height: 0; }
.wave svg { width: 100%; height: 90px; display: block; }

/* ---------- 通用区块标题 ---------- */
.sec-head { text-align: center; max-width: 720px; margin: 0 auto 64px; }
.sec-head .eyebrow {
  display: inline-block; color: var(--primary); font-weight: 700; font-size: 14px;
  letter-spacing: 2px; margin-bottom: 12px; text-transform: uppercase;
}
.sec-head h2 { font-size: clamp(26px, 3.6vw, 36px); font-weight: 800; color: var(--text-dark); line-height: 1.3; letter-spacing: .5px; }
.sec-head p { color: var(--text-muted); font-size: 16px; margin-top: 14px; line-height: 1.8; }

/* ---------- 优势卡片 ---------- */
.adv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.adv-card {
  background: var(--white); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 34px 30px; transition: all .35s ease; position: relative; overflow: hidden;
}
.adv-card::before {
  content: ""; position: absolute; inset: 0; opacity: 0; transition: .35s;
  background: linear-gradient(160deg, rgba(10,108,255,.06), rgba(0,194,255,.04));
}
.adv-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-md); border-color: transparent; }
.adv-card:hover::before { opacity: 1; }
.adv-card .ic {
  width: 58px; height: 58px; border-radius: 14px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--primary), var(--cyan)); color: #fff; margin-bottom: 20px;
  box-shadow: 0 10px 24px rgba(10,108,255,.30);
}
.adv-card h3 { font-size: 20px; margin-bottom: 10px; position: relative; }
.adv-card p { color: var(--text-muted); font-size: 15px; position: relative; }
.adv-card.green .ic { background: linear-gradient(135deg, var(--accent), var(--accent-soft)); box-shadow: 0 10px 24px rgba(0,214,143,.30); }

/* ---------- 模拟实验台/远程监控 双卡（居中） ---------- */
.reliability-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  max-width: 960px;
  margin: 0 auto;
}
.rel-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 38px 34px;
  box-shadow: var(--shadow-sm);
  transition: all .3s ease;
  position: relative;
}
.rel-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}
.rel-card .rel-ic {
  width: 52px; height: 52px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  color: var(--white);
  margin-bottom: 20px;
}
.rel-card.blue .rel-ic {
  background: var(--primary);
  box-shadow: 0 10px 22px rgba(10,108,255,.28);
}
.rel-card.green .rel-ic {
  background: var(--accent);
  box-shadow: 0 10px 22px rgba(0,214,143,.28);
}
.rel-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 12px;
}
.rel-card p {
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.75;
}

/* ---------- 资质认证 四宫格（居中圆徽，区别于优势卡） ---------- */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  max-width: 1100px;
  margin: 0 auto;
}

/* 移动端折叠按钮（默认桌面隐藏，移动端通过 prod-collapsed/case-collapsed 容器显示） */
.collapse-toggle { display: none; }
.cert-item {
  text-align: center;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 34px 26px;
  transition: all .3s ease;
}
.cert-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}
.cert-ic {
  width: 64px; height: 64px;
  border-radius: 50%;
  display: grid; place-items: center;
  color: #fff; margin: 0 auto 18px;
  background: linear-gradient(135deg, var(--primary), var(--cyan));
  box-shadow: 0 12px 26px rgba(10,108,255,.28);
}
.cert-item:nth-child(even) .cert-ic {
  background: linear-gradient(135deg, var(--accent), var(--accent-soft));
  box-shadow: 0 12px 26px rgba(0,214,143,.28);
}
.cert-ic svg { width: 30px; height: 30px; }
.cert-item h3 { font-size: 19px; font-weight: 700; color: var(--text-dark); margin-bottom: 10px; }
.cert-item p { color: var(--text-muted); font-size: 14.5px; line-height: 1.7; }

/* ---------- 浅色区块 ---------- */
.bg-light { background: var(--bg-light); }

/* ---------- 产品预览 ---------- */
.prod-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.prod-card {
  background: var(--white); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 24px; transition: all .35s ease; position: relative; overflow: hidden;
}
.prod-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-md); }
.prod-card .pic {
  height: 188px; border-radius: 14px; margin-bottom: 20px; display: grid; place-items: center;
  background: #fff; border: 1px solid var(--border);
  position: relative; overflow: hidden; transition: border-color .35s ease;
}
.prod-card:hover .pic { border-color: rgba(10,108,255,.4); }
.prod-card .pic img { width: 100%; height: 100%; object-fit: contain; padding: 18px; display: block; }
.prod-card .pic:has(img)::after { content: none; }
.prod-card .pic:has(img) svg { display: none; }
.prod-card .pic svg { width: 46px; height: 46px; color: var(--primary-light); position: relative; z-index: 1; }
.prod-card h4 { font-size: 17px; margin-bottom: 8px; line-height: 1.4; }
.prod-card p { color: var(--text-muted); font-size: 14px; min-height: 42px; line-height: 1.65; }
.prod-card .more { color: var(--primary); font-size: 14px; font-weight: 600; display: inline-flex; align-items: center; gap: 6px; margin-top: 6px; }
.prod-card:hover .more { gap: 10px; }

/* ---------- 数据条 ---------- */
.stats-band {
  background: linear-gradient(135deg, var(--blue-800), var(--blue-600));
  color: #fff; border-radius: var(--radius); padding: 50px 40px;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; text-align: center;
  position: relative; overflow: hidden;
}
.stats-band::before {
  content: ""; position: absolute; inset: 0; opacity: .25;
  background: radial-gradient(400px 200px at 90% 0, var(--cyan), transparent 60%);
}
.stats-band .num { font-size: 46px; font-weight: 800; line-height: 1;
  background: linear-gradient(120deg, #fff, var(--cyan)); -webkit-background-clip: text; background-clip: text; color: transparent; position: relative; }
.stats-band .lbl { margin-top: 10px; color: rgba(255,255,255,.8); font-size: 15px; position: relative; }

/* ---------- CTA ---------- */
.cta {
  background:
    radial-gradient(700px 300px at 80% 0, rgba(0,194,255,.30), transparent 60%),
    linear-gradient(135deg, var(--blue-900), var(--blue-700));
  color: #fff; border-radius: 22px; padding: 60px 50px; text-align: center; position: relative; overflow: hidden;
}
.cta h2 { font-size: 34px; font-weight: 800; margin-bottom: 14px; }
.cta p { color: rgba(255,255,255,.82); max-width: 560px; margin: 0 auto 28px; font-size: 16px; }

/* ---------- 页脚 ---------- */
.footer { background: var(--blue-900); color: rgba(255,255,255,.78); padding: 64px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 36px; }
.footer .brand .name { color: #fff; }
.footer .f-about p { font-size: 14px; line-height: 1.8; margin-top: 16px; max-width: 320px; }
.footer h4 { color: #fff; font-size: 16px; margin-bottom: 18px; font-weight: 700; }
.footer ul li { margin-bottom: 11px; font-size: 14px; }
.footer ul li a:hover { color: var(--cyan); }
.footer .contact-line { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; margin-bottom: 12px; }
.footer .contact-line svg { width: 18px; height: 18px; color: var(--cyan); flex: none; margin-top: 3px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.12); margin-top: 44px; padding-top: 22px;
  text-align: center; font-size: 13px; color: rgba(255,255,255,.55);
}

/* ---------- 关于页 / 时间轴 ---------- */
.timeline { position: relative; max-width: 800px; margin: 0 auto; padding-left: 30px; }
.timeline::before { content: ""; position: absolute; left: 7px; top: 6px; bottom: 6px; width: 2px;
  background: linear-gradient(var(--primary), var(--cyan)); }
.tl-item { position: relative; padding: 0 0 38px 30px; }
.tl-item::before { content: ""; position: absolute; left: -30px; top: 4px; width: 16px; height: 16px; border-radius: 50%;
  background: #fff; border: 3px solid var(--primary); box-shadow: 0 0 0 4px rgba(10,108,255,.15); }
.tl-item .year { font-size: 22px; font-weight: 800; color: var(--primary); }
.tl-item h4 { font-size: 17px; margin: 4px 0 6px; }
.tl-item p { color: var(--text-muted); font-size: 15px; }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
.split .media {
  height: 380px; border-radius: var(--radius); position: relative; overflow: hidden;
  background: linear-gradient(160deg, var(--blue-800), var(--blue-600));
  box-shadow: var(--shadow-md);
}
.split .media::after {
  content: ""; position: absolute; inset: 0; opacity: .35;
  background:
    radial-gradient(300px 200px at 30% 20%, var(--cyan), transparent 60%),
    linear-gradient(rgba(255,255,255,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.07) 1px, transparent 1px);
  background-size: auto, 30px 30px, 30px 30px;
}
.split .media img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.split ul.check li { display: flex; gap: 12px; margin-bottom: 14px; align-items: flex-start; font-size: 15px; }
.split ul.check li svg { width: 22px; height: 22px; color: var(--accent); flex: none; margin-top: 2px; }
.split h2 { font-size: 32px; font-weight: 800; margin-bottom: 16px; }
.split p { color: var(--text-muted); margin-bottom: 16px; font-size: 15px; }

/* ---------- 产品详情页 ---------- */
.prod-hero {
  background: radial-gradient(800px 400px at 80% 0, rgba(0,194,255,.25), transparent 60%),
    linear-gradient(160deg, var(--blue-900), var(--blue-700));
  color: #fff; padding: calc(var(--nav-h) + 70px) 0 90px; text-align: center;
}
.prod-hero h1 { font-size: clamp(28px, 4vw, 42px); font-weight: 800; margin-bottom: 14px; }
.prod-hero p { color: rgba(255,255,255,.8); max-width: 620px; margin: 0 auto; font-size: 16px; }

.series-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }
.series-card {
  background: var(--white); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px; display: flex; flex-direction: column; gap: 20px; transition: all .35s ease;
}
.series-main { display: grid; grid-template-columns: 84px 1fr; gap: 24px; }
.series-photo {
  position: relative; width: 100%; aspect-ratio: 16 / 10; border-radius: 14px; overflow: hidden;
  background: var(--bg-soft); border: 1px dashed var(--border);
  display: grid; place-items: center; color: var(--text-muted); font-size: 13px;
}
.series-photo::before { content: "产品实图占位"; }
.series-photo img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; display: block; }
.series-photo:has(img) { border-style: solid; }
.series-photo:has(img)::before { content: none; }
.series-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: transparent; }
.series-card .badge {
  width: 84px; height: 84px; border-radius: 18px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--primary), var(--cyan)); color: #fff;
}
.series-card .badge svg { width: 40px; height: 40px; }
.series-card h3 { font-size: 20px; margin-bottom: 8px; }
.series-card p { color: var(--text-muted); font-size: 14.5px; margin-bottom: 14px; }
.series-card .tags { display: flex; flex-wrap: wrap; gap: 8px; }
.series-card .tags span {
  font-size: 12.5px; padding: 5px 12px; border-radius: 999px;
  background: var(--bg-soft); color: var(--blue-600); font-weight: 600;
}
.series-card.green .badge { background: linear-gradient(135deg, var(--accent), var(--accent-soft)); }
.series-card .series-more { display: inline-block; margin-top: 16px; color: var(--primary); font-weight: 600; font-size: 14px; transition: .25s; }
.series-card:hover .series-more { color: var(--accent); transform: translateX(3px); }

/* ---------- 联系页 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 44px; }
.contact-info .info-card {
  background: var(--white); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 30px; box-shadow: var(--shadow-sm); margin-bottom: 20px;
}
.contact-info .info-card .row { display: flex; gap: 16px; align-items: flex-start; }
.contact-info .info-card .ic {
  width: 46px; height: 46px; border-radius: 12px; flex: none; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--primary), var(--cyan)); color: #fff;
}
.contact-info .info-card h4 { font-size: 16px; margin-bottom: 4px; }
.contact-info .info-card p { color: var(--text-muted); font-size: 14.5px; }
.form-card {
  background: var(--white); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 36px; box-shadow: var(--shadow-sm);
}
.form-card h3 { font-size: 22px; margin-bottom: 6px; }
.form-card .sub { color: var(--text-muted); font-size: 14px; margin-bottom: 24px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 8px; }
.field input, .field textarea, .field select {
  width: 100%; padding: 13px 15px; border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  font-size: 15px; font-family: inherit; color: var(--text-dark); background: var(--bg-light); transition: .25s;
}
.field input:focus, .field textarea:focus, .field select:focus {
  outline: none; border-color: var(--primary); background: #fff; box-shadow: 0 0 0 4px rgba(10,108,255,.12);
}
.field textarea { resize: vertical; min-height: 120px; }
.field .err { color: #e23b3b; font-size: 13px; margin-top: 6px; display: none; }
.field.invalid input, .field.invalid textarea { border-color: #e23b3b; background: #fff5f5; }
.field.invalid .err { display: block; }
.form-note { font-size: 13px; color: var(--text-muted); margin-top: 8px; }
.form-success {
  display: none; padding: 16px 18px; border-radius: var(--radius-sm); margin-top: 16px;
  background: rgba(0,214,143,.12); border: 1px solid rgba(0,214,143,.4); color: #0a8a5e; font-size: 14px;
}
.map-box {
  height: 320px; border-radius: var(--radius); overflow: hidden; margin-top: 24px;
  background: linear-gradient(135deg, #e8f1fb, #d4e6f7);
  display: grid; place-items: center; color: var(--blue-600); text-align: center; border: 1px solid var(--border);
}
.map-box svg { width: 54px; height: 54px; margin-bottom: 12px; opacity: .8; }

/* ---------- 回到顶部 ---------- */
.to-top {
  position: fixed; right: 24px; bottom: 24px; width: 46px; height: 46px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--cyan)); color: #fff; border: 0; cursor: pointer;
  display: grid; place-items: center; box-shadow: var(--shadow-md); opacity: 0; visibility: hidden;
  transition: .3s; z-index: 900;
}
.to-top.show { opacity: 1; visibility: visible; }
.to-top:hover { transform: translateY(-4px); }

/* ---------- 入场动画 ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 资质认证条 ---------- */
.cert-strip { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; margin-top: 14px; }
.cert-pill {
  display: inline-flex; align-items: center; gap: 10px; padding: 13px 22px; border-radius: 999px;
  background: var(--white); border: 1px solid var(--border); box-shadow: var(--shadow-sm);
  font-size: 14.5px; font-weight: 600; color: var(--text-dark);
}
.cert-pill svg { width: 20px; height: 20px; color: var(--primary); flex: none; }
.cert-pill.green svg { color: var(--accent); }
.cert-pill small { display: block; font-size: 11.5px; color: var(--text-muted); font-weight: 500; }

/* ---------- 荣誉资质卡片 ---------- */
.honor-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.honor-card {
  background: var(--white); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px 24px; transition: all .35s ease; position: relative; overflow: hidden;
}
.honor-card::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
  background: linear-gradient(var(--primary), var(--cyan));
}
.honor-card.green::before { background: linear-gradient(var(--accent), var(--accent-soft)); }
.honor-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.honor-card .yr { font-size: 20px; font-weight: 800; color: var(--primary); }
.honor-card h4 { font-size: 16px; margin: 6px 0 8px; line-height: 1.4; }
.honor-card p { font-size: 14px; color: var(--text-muted); }

/* 专利证书展示墙（占位，替换为真实证书照片） */
.patent-gallery { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-top: 38px; }
.patent-card { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; transition: all .35s ease; }
.patent-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: rgba(10,108,255,.42); }
.patent-photo { aspect-ratio: 4 / 3; border-radius: 12px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px; margin-bottom: 14px; background: linear-gradient(160deg, #eef4fc, var(--bg-light)); border: 1px dashed rgba(10,108,255,.38); color: var(--primary); }
.patent-photo svg { width: 48px; height: 48px; opacity: .65; }
.patent-photo span { font-size: 14px; font-weight: 700; letter-spacing: 1px; }
.patent-card img { width: 100%; height: auto; object-fit: contain; border-radius: 12px; display: block; margin-bottom: 14px; background: #fff; }
.patent-img { object-fit: contain; background: #fff; border: 1px solid var(--border); }
.patent-meta b { display: block; font-size: 15px; color: var(--text-dark); }
.patent-meta small { color: var(--text-muted); font-size: 12.5px; letter-spacing: .3px; }
.patent-tip { margin-top: 16px; font-size: 13px; color: var(--text-muted); text-align: center; }

/* ---------- 产品详情页 ---------- */
.breadcrumb { padding: 26px 0 0; font-size: 14px; color: var(--text-muted); }
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb i { margin: 0 8px; font-style: normal; color: #c4d2e6; }
.breadcrumb .cur { color: var(--primary); font-weight: 600; }

.pdetail-hero { position: relative; padding: calc(var(--nav-h) + var(--topbar-h) + 26px) 0 44px; background: linear-gradient(135deg, #06204a, var(--primary)); color: #fff; overflow: hidden; }
.pdetail-hero::after { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,.06) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.06) 1px, transparent 1px); background-size: 40px 40px; -webkit-mask-image: radial-gradient(820px 320px at 82% 0%, #000, transparent 72%); mask-image: radial-gradient(820px 320px at 82% 0%, #000, transparent 72%); }
.pdetail-hero .container { position: relative; z-index: 2; }
.pdh-top { display: flex; align-items: center; gap: 22px; margin-bottom: 20px; }
.pdh-icon { width: 74px; height: 74px; border-radius: 18px; display: grid; place-items: center; background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.25); flex: none; }
.pdh-icon svg { width: 38px; height: 38px; }
.pdh-top h1 { font-size: clamp(25px, 4vw, 38px); font-weight: 800; line-height: 1.2; }
.pdh-top .en { font-size: 13px; letter-spacing: 1.5px; color: rgba(255,255,255,.72); margin-top: 5px; }
.pdh-tagline { font-size: 16px; color: rgba(255,255,255,.92); margin-bottom: 16px; }
.pdh-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.pdh-tags span { padding: 6px 14px; border-radius: 999px; background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.22); font-size: 13px; }

.pdetail-body { display: grid; grid-template-columns: 1fr 320px; gap: 42px; align-items: start; }
.pd-block { margin-bottom: 46px; }
.pd-main h3.pd-h { font-size: 22px; margin: 0 0 18px; display: flex; align-items: center; gap: 11px; }
.pd-main h3.pd-h::before { content: ""; width: 5px; height: 23px; border-radius: 3px; background: linear-gradient(var(--primary), var(--accent)); }
.pd-lead { font-size: 16px; line-height: 2; color: var(--text); }
.pd-lead + .pd-lead { margin-top: 16px; }
/* 产品详情页「产品实景」单图（白底设备图，完整呈现不裁切） */
.pd-figure {
  max-width: 760px; margin: 0 auto 6px;
  border-radius: var(--radius); overflow: hidden;
  background: #fff; border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.pd-figure img { width: 100%; height: auto; object-fit: contain; display: block; }

/* 详情页「产品实景」多图网格（2 列白底卡片，复用 .pd-figure 视觉，区别于案例页 .detail-gallery） */
.pd-figure-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin: 0; }
.pd-figure-grid .pd-figure { max-width: none; margin: 0; }
.pd-figure-grid .pd-figure img { aspect-ratio: 4 / 3; }
@media (max-width: 768px) { .pd-figure-grid { grid-template-columns: 1fr; } }

.feat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.feat-item { display: flex; gap: 14px; padding: 20px; background: #fff; border: 1px solid var(--border); border-radius: 16px; box-shadow: var(--shadow-sm); transition: .3s; }
.feat-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: rgba(10,108,255,.4); }
.feat-item .fi-ic { width: 44px; height: 44px; border-radius: 12px; flex: none; display: grid; place-items: center; background: linear-gradient(135deg, var(--primary), var(--primary-light)); color: #fff; }
.feat-item.green .fi-ic { background: linear-gradient(135deg, var(--accent), var(--accent-soft)); }
.feat-item h4 { font-size: 16px; margin-bottom: 6px; }
.feat-item p { font-size: 13.5px; color: var(--text-muted); line-height: 1.7; }

.pd-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.pd-list li { display: flex; gap: 12px; align-items: flex-start; font-size: 15px; line-height: 1.8; color: var(--text); }
.pd-list li svg { flex: none; margin-top: 3px; color: var(--primary); }

.spec-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 14px; overflow: hidden; border: 1px solid var(--border); box-shadow: var(--shadow-sm); }
.spec-table th, .spec-table td { padding: 14px 18px; text-align: left; font-size: 14.5px; border-bottom: 1px solid var(--border); }
.spec-table thead th { background: linear-gradient(135deg, var(--primary), var(--primary-light)); color: #fff; font-weight: 600; }
.spec-table tbody tr:nth-child(even) { background: var(--bg-light); }
.spec-table tbody tr:last-child td { border-bottom: none; }
.spec-table td:first-child { color: var(--text-muted); width: 38%; }

.scenario-tags, .model-list { display: flex; flex-wrap: wrap; gap: 12px; }
.scenario-tags span { padding: 10px 18px; border-radius: 12px; background: var(--bg-light); border: 1px solid var(--border); font-size: 14.5px; color: var(--text); }
.model-list span { padding: 10px 18px; border-radius: 10px; background: #fff; border: 1px dashed rgba(10,108,255,.4); font-weight: 600; color: var(--primary); font-size: 14.5px; }

/* 侧栏 */
.pd-side { position: sticky; top: calc(var(--nav-h) + var(--topbar-h) + 18px); display: grid; gap: 20px; }
.pd-card { background: #fff; border: 1px solid var(--border); border-radius: 18px; padding: 24px; box-shadow: var(--shadow-sm); }
.pd-card.cta-card { background: linear-gradient(135deg, var(--primary), var(--primary-light)); color: #fff; border: none; }
.pd-card.cta-card h4 { font-size: 19px; margin-bottom: 10px; }
.pd-card.cta-card p { font-size: 14px; color: rgba(255,255,255,.9); margin-bottom: 18px; line-height: 1.7; }
.pd-card h4.pd-card-t { font-size: 17px; margin-bottom: 14px; }
.pd-quick { display: grid; gap: 12px; }
.pd-quick .qrow { display: flex; justify-content: space-between; font-size: 14px; padding-bottom: 10px; border-bottom: 1px dashed var(--border); }
.pd-quick .qrow:last-child { border-bottom: none; padding-bottom: 0; }
.pd-quick .qrow b { color: var(--primary); }
.pd-card .btn { width: 100%; justify-content: center; }
.pd-card.cta-card .btn { background: #fff; color: var(--primary); border: none; }
.pd-card.cta-card .btn:hover { background: #eaf2ff; transform: translateY(-2px); }
.pd-related-list { display: grid; gap: 10px; }
.pd-related-list a { display: flex; align-items: center; gap: 10px; padding: 11px 14px; border-radius: 10px; background: var(--bg-light); font-size: 14px; color: var(--text); transition: .25s; }
.pd-related-list a:hover { background: rgba(10,108,255,.08); color: var(--primary); }
.pd-related-list a svg { flex: none; color: var(--primary); }

/* 相关产品 */
.related-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.related-card { display: block; background: #fff; border: 1px solid var(--border); border-radius: 16px; padding: 22px; box-shadow: var(--shadow-sm); transition: .3s; }
.related-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: rgba(10,108,255,.4); }
.related-card .rc-ic { width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center; background: linear-gradient(135deg, var(--primary), var(--primary-light)); color: #fff; margin-bottom: 14px; }
.related-card.green .rc-ic { background: linear-gradient(135deg, var(--accent), var(--accent-soft)); }
.related-card h4 { font-size: 16px; margin-bottom: 6px; }
.related-card p { font-size: 13px; color: var(--text-muted); line-height: 1.6; }
.related-card .more { display: inline-block; margin-top: 10px; font-size: 13px; color: var(--primary); font-weight: 600; }

/* ---------- 工程案例 ---------- */
.case-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.case-card {
  background: var(--white); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; transition: all .35s ease; display: block;
}
.case-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-md); border-color: transparent; }
.case-photo {
  aspect-ratio: 16 / 9; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px;
  background: linear-gradient(160deg, var(--blue-800), var(--blue-600)); color: rgba(255,255,255,.85); position: relative; overflow: hidden;
}
.case-photo::after {
  content: ""; position: absolute; inset: 0; opacity: .35;
  background:
    radial-gradient(300px 200px at 30% 20%, var(--cyan), transparent 60%),
    linear-gradient(rgba(255,255,255,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.07) 1px, transparent 1px);
  background-size: auto, 30px 30px, 30px 30px;
}
.case-photo svg { width: 46px; height: 46px; position: relative; z-index: 1; opacity: .9; }
.case-photo span { font-size: 14px; font-weight: 700; letter-spacing: 2px; position: relative; z-index: 1; }
.case-card img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; display: block; }
/* 真实照片上轻量化叠加层，避免遮挡画面、提升清晰度 */
.case-photo:has(img)::after { opacity: .12; }
.case-photo:has(img) { background: #0b2740; }
.case-body { padding: 22px 22px 26px; }
.case-tag {
  display: inline-block; font-size: 12.5px; font-weight: 700; letter-spacing: .5px;
  color: var(--primary); background: var(--bg-soft); padding: 5px 12px; border-radius: 999px; margin-bottom: 14px;
}
.case-body h4 { font-size: 18px; margin-bottom: 10px; line-height: 1.4; }
.case-body p { color: var(--text-muted); font-size: 14.5px; }
.case-tip { margin-top: 28px; font-size: 13px; color: var(--text-muted); text-align: center; }

/* ---------- 新闻动态 ---------- */
.news-list { display: grid; gap: 20px; }
.news-item {
  display: grid; grid-template-columns: 150px 1fr; gap: 30px; align-items: center;
  background: var(--white); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 32px; transition: all .35s ease;
}
.news-item:hover { box-shadow: var(--shadow-md); border-color: transparent; transform: translateY(-4px); }
.news-date {
  text-align: center; border-right: 1px dashed var(--border); padding-right: 24px;
  display: flex; flex-direction: column; align-items: center; gap: 4px;
}
.news-date .d { font-size: 34px; font-weight: 800; color: var(--primary); line-height: 1; }
.news-date .y { font-size: 13px; color: var(--text-muted); letter-spacing: 1px; }
.news-main h3 { font-size: 20px; margin-bottom: 10px; line-height: 1.4; }
.news-main p { color: var(--text-muted); font-size: 14.5px; margin-bottom: 12px; }
.news-more { display: inline-block; color: var(--primary); font-weight: 600; font-size: 14px; }

/* ---------- 详情页（案例 / 新闻） ---------- */
.detail-figure {
  position: relative; width: 100%; aspect-ratio: 16 / 9; border-radius: 14px; overflow: hidden;
  background: linear-gradient(160deg, var(--blue-800), var(--blue-600)); color: rgba(255,255,255,.88);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px; margin-bottom: 8px;
}
.detail-figure::after {
  content: ""; position: absolute; inset: 0; opacity: .35;
  background:
    radial-gradient(300px 200px at 30% 20%, var(--cyan), transparent 60%),
    linear-gradient(rgba(255,255,255,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.07) 1px, transparent 1px);
  background-size: auto, 30px 30px, 30px 30px;
}
.detail-figure svg { width: 60px; height: 60px; position: relative; z-index: 1; opacity: .9; }
.detail-figure span { position: relative; z-index: 1; font-size: 14px; font-weight: 700; letter-spacing: 2px; }
.detail-figure img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }

.detail-gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 14px 0 30px; }
.detail-gallery .g {
  aspect-ratio: 4 / 3; border-radius: 12px; background: linear-gradient(160deg, var(--blue-800), var(--blue-600));
  display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,.8); font-size: 12px; letter-spacing: 1px;
}
.detail-gallery .g img { width: 100%; height: 100%; object-fit: cover; display: block; border-radius: 12px; }

.back-link {
  display: inline-flex; align-items: center; gap: 6px; color: var(--primary); font-weight: 600; font-size: 14px;
  margin-bottom: 22px; transition: gap .25s;
}
.back-link:hover { gap: 11px; }

.case-more { display: inline-block; margin-top: 14px; color: var(--primary); font-weight: 600; font-size: 14px; }

.article-body { font-size: 15.5px; line-height: 1.95; color: var(--text-dark); }
.article-body p { margin-bottom: 16px; }
.article-body p.lead { font-size: 17px; color: var(--blue-700); font-weight: 600; line-height: 1.8; margin-bottom: 22px; }

/* 关于我们 / 资质荣誉 子导航 */
.inpage-nav { background: var(--white); border-bottom: 1px solid var(--border); position: sticky; top: calc(var(--nav-h) + var(--topbar-h)); z-index: 30; }
.inpage-nav .container { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; padding-top: 0; padding-bottom: 0; }
.inpage-nav a { position: relative; padding: 13px 26px; margin: 14px 0; font-size: 15px; font-weight: 600; letter-spacing: .5px; color: var(--text-muted); border-radius: 999px; transition: all .25s; }
.inpage-nav a:hover { color: var(--primary); background: rgba(10,108,255,.08); }
.inpage-nav a.active { color: #fff; background: linear-gradient(135deg, var(--primary), var(--accent)); box-shadow: 0 10px 22px rgba(10,108,255,.32); }

/* 首页资质荣誉入口卡 */
.honor-entry { display: grid; grid-template-columns: 1.1fr 1fr; gap: 44px; align-items: center; background: var(--white); border: 1px solid var(--border); border-radius: var(--radius); padding: 40px; box-shadow: var(--shadow-sm); }
.honor-entry .he-desc p { font-size: 16px; line-height: 1.95; color: var(--text); margin-bottom: 26px; }
.honor-entry .he-right { display: grid; grid-template-columns: 1fr; gap: 14px; }
.he-mini { display: flex; align-items: center; gap: 12px; padding: 16px 22px; background: var(--bg-light); border: 1px solid var(--border); border-radius: 14px; font-size: 16px; color: var(--text); flex-wrap: nowrap; }
.he-mini b { color: var(--primary); font-weight: 800; font-size: 19px; letter-spacing: .5px; white-space: nowrap; }
.he-mini .dot { width: 10px; height: 10px; border-radius: 50%; background: linear-gradient(135deg, var(--primary), var(--accent)); flex: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 1200px) {
  .case-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 980px) {
  .hero-inner { max-width: 100%; }
  .hero h1 { font-size: 40px; }
  .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .reliability-grid { grid-template-columns: 1fr; }
  .cert-grid { grid-template-columns: repeat(2, 1fr); }
  .prod-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-band { grid-template-columns: repeat(2, 1fr); }
  .split { grid-template-columns: 1fr; }
  .series-grid { grid-template-columns: 1fr; }
  .honor-grid { grid-template-columns: repeat(2, 1fr); }
  .patent-gallery { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; align-items: start; }
  .pdetail-body { grid-template-columns: 1fr; }
  .pd-side { position: static; }
  .related-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed; top: calc(var(--nav-h) + var(--topbar-h)); left: 0; right: 0; background: rgba(6,26,53,.97);
    flex-direction: column; align-items: stretch; gap: 0; padding: 14px 24px 24px;
    transform: translateY(-130%); transition: .35s; box-shadow: var(--shadow-md);
  }
  .nav-links.open { transform: none; }
  .nav-links a { padding: 14px 12px; border-radius: 8px; }
  .case-grid { grid-template-columns: repeat(2, 1fr); }
  .honor-entry { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .section-pad { padding: 44px 0; }
  .container { padding: 0 16px; }
  .hero { padding: 64px 0 56px; }
  .hero h1 { font-size: 28px; line-height: 1.25; }
  .hero p.lead { font-size: 14px; line-height: 1.75; }
  .hero .hero-actions { gap: 10px; flex-wrap: wrap; }
  .hero .btn { padding: 12px 20px; font-size: 14px; }
  .hero-stats { gap: 14px; padding: 14px; }
  .hero-stats .item { padding: 6px 10px; }
  .hero-stats .item .num { font-size: 22px; }
  .hero-stats .item .lbl { font-size: 12px; }
  .hero-badges { gap: 6px; }
  .hero-badges .f-badge { font-size: 11px; padding: 6px 10px; }
  .sec-head { margin-bottom: 28px; }
  .sec-head h2 { font-size: 24px; }
  .sec-head p { font-size: 14px; }
  .sec-head .eyebrow { font-size: 12px; padding: 5px 11px; }
  .prod-grid, .stats-band, .footer-grid, .honor-grid, .patent-gallery, .case-grid, .news-item, .adv-grid, .reliability-grid { grid-template-columns: 1fr; gap: 14px; }
  .cert-grid { grid-template-columns: 1fr; }
  .prod-card { padding: 14px; }
  .prod-card .pic { margin-bottom: 12px; }
  .prod-card h4 { font-size: 16px; margin-bottom: 6px; }
  .prod-card p { font-size: 13px; }
  .adv-card { padding: 20px 18px; }
  .adv-card h3 { font-size: 18px; }
  .adv-card p { font-size: 13.5px; line-height: 1.7; }
  .adv-card .ic { width: 44px; height: 44px; margin-bottom: 14px; }
  .rel-card { padding: 22px 18px; }
  .rel-card h3 { font-size: 18px; }
  .rel-card p { font-size: 13.5px; }
  .cert-item { padding: 20px 16px; }
  .cert-item .cert-ic { width: 56px; height: 56px; margin: 0 auto 12px; }
  .cert-item h4 { font-size: 17px; }
  .cert-item p { font-size: 13px; }
  .stats-band { padding: 28px 16px; gap: 16px; }
  .stats-band > div .num { font-size: 28px; }
  .stats-band > div .lbl { font-size: 13px; }
  .case-card { border-radius: 14px; }
  .case-card .case-body { padding: 16px; }
  .case-card .case-body h4 { font-size: 15px; margin-bottom: 6px; }
  .case-card .case-body p { font-size: 13px; line-height: 1.65; }
  .case-card .case-tag { font-size: 11px; padding: 3px 9px; margin-bottom: 8px; }
  .cta { padding: 36px 22px; }
  .cta h2 { font-size: 22px; }
  .cta p { font-size: 14px; }
  .series-card { text-align: center; }
  .series-main { grid-template-columns: 1fr; }
  .series-card .badge { margin: 0 auto; }
  .series-card .tags { justify-content: center; }
  .feat-grid { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .detail-gallery { grid-template-columns: 1fr; }
  .news-item { gap: 14px; padding: 20px; }
  .news-date { border-right: none; border-bottom: 1px dashed var(--border); padding: 0 0 14px; }
  .news-date .d { font-size: 26px; }
  .news-date .y { font-size: 12px; }
  .news-main h3 { font-size: 16px; margin-bottom: 8px; }
  .news-main p { font-size: 13px; line-height: 1.65; }
  .honor-entry { padding: 24px 18px; gap: 20px; }
  .honor-entry .he-right { grid-template-columns: 1fr; }
  .he-mini { padding: 12px 16px; font-size: 14px; }
  .inpage-nav .container { gap: 10px; flex-wrap: wrap; padding: 8px 16px; }
  .inpage-nav a { padding: 11px 22px; margin: 10px 0; font-size: 17px; }
  .footer { padding-top: 36px; padding-bottom: 22px; }
  .footer-grid { gap: 24px; }
  .footer-bottom { font-size: 12px; padding: 18px 12px; margin-top: 22px; }
  .btn { padding: 12px 22px; font-size: 14px; }
  .to-top { bottom: 18px; right: 18px; width: 40px; height: 40px; }
  /* 首页卡片长列表：超出的项默认隐藏，js 点击"展开更多"后显示 */
  .prod-collapsed:not(.open) .prod-card:nth-child(n+5),
  .case-collapsed:not(.open) .case-card:nth-child(n+5) { display: none; }
  .collapse-toggle { display: none; align-items: center; gap: 6px; margin-top: 22px; padding: 12px 26px; border: 1px solid var(--primary); border-radius: 999px; color: var(--primary); font-size: 14px; font-weight: 600; background: var(--white); cursor: pointer; transition: all .2s; }
  .collapse-toggle:hover { background: var(--primary); color: var(--white); }
  .collapse-toggle .ic { transition: transform .25s; }
  .collapse-toggle[aria-expanded="true"] .ic { transform: rotate(180deg); }
  .prod-collapsed .collapse-toggle,
  .case-collapsed .collapse-toggle { display: inline-flex; }
}

/* =========================================================
   中英文双语：语言切换控件 + 英文排版兼容
   ========================================================= */
.lang-switch {
  display: inline-flex; align-items: center; gap: 2px; flex: none;
  margin-left: 10px; padding: 3px; border-radius: 999px;
  background: rgba(255,255,255,.10);
  border: 1px solid rgba(255,255,255,.22);
}
.lang-btn {
  min-width: 36px; height: 28px; padding: 0 10px;
  border: 0; border-radius: 999px; background: transparent;
  color: rgba(255,255,255,.8);
  font-family: inherit; font-size: 13px; font-weight: 600; line-height: 1;
  cursor: pointer; transition: all .25s ease;
}
.lang-btn:hover { color: #fff; background: rgba(255,255,255,.16); }
.lang-btn.active { background: var(--primary); color: #fff; box-shadow: 0 2px 10px rgba(10,108,255,.4); }
.lang-btn:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }

/* 英文文案普遍更长：收紧导航间距、关键位置允许折行，避免溢出/截断/错位 */
html[lang="en"] .nav-links { gap: 2px; }
html[lang="en"] .nav-links a { font-size: 14px; padding: 9px 11px; white-space: nowrap; }
html[lang="en"] .btn { white-space: nowrap; }
html[lang="en"] .footer a,
html[lang="en"] .footer li,
html[lang="en"] .footer .contact-line span,
html[lang="en"] .prod-card h4,
html[lang="en"] .case-card h4,
html[lang="en"] .news-item h3 { overflow-wrap: break-word; word-break: break-word; }
html[lang="en"] .footer a { white-space: normal; }
html[lang="en"] .sec-head h2,
html[lang="en"] .prod-hero h1,
html[lang="en"] .hero h1 { overflow-wrap: break-word; }
html[lang="en"] .footer .contact-line { align-items: flex-start; }

/* 移动端：控件紧凑，展开面板内允许折行 */
@media (max-width: 768px) {
  .lang-switch { margin-left: 6px; padding: 2px; }
  .lang-btn { min-width: 30px; height: 26px; padding: 0 7px; font-size: 12px; }
  html[lang="en"] .nav-links a { font-size: 14px; padding: 14px 12px; white-space: normal; }
}