:root{
  --bg:#f6f9fc;
  --surface:#ffffff;
  --card:#ffffff;
  --text:#0b1c2d;
  --muted:#5b6f86;
  --accent:#1f78c8;      /* industrial blue */
  --accent2:#4da3ff;     /* light blue */
  --accent3:#0b4f8a;     /* deep blue */
  --border:rgba(11,28,45,.10);
  --shadow: 0 10px 30px rgba(11,28,45,.10);
  --radius: 18px;
  --max: 1120px;
}




*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  background: radial-gradient(1000px 600px at 80% -10%, rgba(31,120,200,.08), transparent 60%),
              radial-gradient(1000px 600px at -10% 20%, rgba(77,163,255,.06), transparent 60%),
              #f6f9fc;
  color: var(--text);
  line-height:1.55;
}

a{color:inherit;text-decoration:none}
a:hover{opacity:.95}
.container{max-width:var(--max); margin:0 auto; padding:0 20px}
.small{font-size:.95rem;color:var(--muted)}
.kicker{letter-spacing:.14em; text-transform:uppercase; font-size:.78rem; color:var(--muted)}
h1,h2,h3{margin:0 0 10px}
h1{font-size:clamp(2rem, 4.2vw, 3.25rem); line-height:1.1}
h2{font-size:clamp(1.35rem, 2.6vw, 2rem)}
h3{font-size:1.1rem}
p{margin:0 0 14px;color:var(--muted)}

.header{
  position: sticky;
  top:0;
  z-index:50;
  background: rgba(246,249,252,.92);
  backdrop-filter: blur(10px);
  border-bottom:1px solid var(--border);
}
.navbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:14px 0;
}
.brand{
  display:flex;
  align-items:center;
  gap:10px;
  font-weight:800;
  letter-spacing:.02em;
}
.brand-badge{
  width:34px;height:34px;border-radius:10px;
  background: linear-gradient(135deg, #1f78c8, #4da3ff);
  box-shadow: var(--shadow);
}
.navlinks{
  display:flex;
  align-items:center;
  gap:14px;
  flex-wrap:wrap;
  justify-content:flex-end;
}
.navlinks a{
  padding:8px 10px;
  border-radius:12px;
  color:var(--muted);
  border:1px solid transparent;
}
.navlinks a.active, .navlinks a:hover{
  color:var(--text);
  border-color: var(--border);
  background: rgba(31,120,200,.04);
}
.lang{
  display:flex; gap:8px; align-items:center;
}
.lang a{
  padding:7px 10px;border-radius:12px;border:1px solid var(--border);
  color:var(--muted);
}
.lang a.active{color:var(--text); background: rgba(31,120,200,.06)}
.burger{
  display:none;
  padding:8px 10px;
  border:1px solid var(--border);
  border-radius:12px;
  background: rgba(31,120,200,.04);
  color:var(--text);
}
.mobile{
  display:none;
  padding:8px 0 16px;
}
.mobile a{
  display:block;
  padding:10px 12px;
  border-radius:12px;
  border:1px solid var(--border);
  margin-top:10px;
  color:var(--muted);
  background: rgba(31,120,200,.03);
}

.hero{
  padding:74px 0 44px;
}
.hero-grid{
  display:grid;
  grid-template-columns: 1.2fr .8fr;
  gap:22px;
  align-items:stretch;
}
.hero-card{
  background: rgba(31,120,200,.03);
  border:1px solid var(--border);
  border-radius: var(--radius);
  padding:26px;
  box-shadow: var(--shadow);
}
.hero-art{
  border-radius: var(--radius);
  border:1px solid var(--border);
  background:
    radial-gradient(450px 260px at 20% 15%, rgba(31,120,200,.26), transparent 55%),
    radial-gradient(450px 260px at 75% 35%, rgba(77,163,255,.18), transparent 55%),
    linear-gradient(180deg, rgba(31,120,200,.06), rgba(255,255,255,.01));
  display:flex;
  flex-direction:column;
  justify-content:space-between;
  padding:18px;
}
.hero-art .tag{
  display:inline-flex;
  gap:8px;
  align-items:center;
  width:max-content;
  padding:8px 10px;
  border-radius: 999px;
  border:1px solid var(--border);
  color:var(--muted);
  font-size:.9rem;
  background: rgba(31,120,200,.04);
}
.hero-art .spec{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap:10px;
  margin-top:12px;
}
.pill{
  padding:10px 12px;
  border-radius: 14px;
  border:1px solid var(--border);
  background: rgba(31,120,200,.03);
}
.pill b{display:block;color:var(--text); font-size:1rem}
.pill span{display:block;color:var(--muted); font-size:.9rem}

.actions{display:flex; gap:12px; flex-wrap:wrap; margin-top:18px}
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 14px;
  border-radius: 14px;
  border:1px solid var(--border);
  background: rgba(31,120,200,.04);
  color:var(--text);
  font-weight:650;
}
.btn.primary{
  border-color: transparent;
  background: linear-gradient(135deg, #1f78c8, #4da3ff);
  color:#ffffff;
}
.btn:hover{transform: translateY(-1px)}
.section{padding:48px 0}
.grid-3{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap:16px;
}
.card{
  padding:18px;
  background: rgba(31,120,200,.03);
  border:1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.card .icon{
  width:38px;height:38px;border-radius:14px;
  background: linear-gradient(135deg, rgba(31,120,200,.30), rgba(11,79,138,.18));
  border:1px solid var(--border);
  margin-bottom:10px;
}
.grid-2{
  display:grid;
  grid-template-columns: repeat(2, 1fr);
  gap:16px;
}
.tiles{
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  gap:12px;
}
.tile{
  min-height:120px;
  padding:14px;
  border-radius: var(--radius);
  border:1px solid var(--border);
  background:
    radial-gradient(220px 160px at 20% 20%, rgba(31,120,200,.20), transparent 55%),
    radial-gradient(220px 160px at 75% 45%, rgba(77,163,255,.14), transparent 55%),
    rgba(31,120,200,.03);
  box-shadow: var(--shadow);
  display:flex;
  flex-direction:column;
  justify-content:space-between;
}
.tile .title{font-weight:750}
.tile .subtitle{color:var(--muted); font-size:.92rem}
.tile:hover{transform: translateY(-2px)}

.page-hero{
  padding:54px 0 18px;
}
.breadcrumb{color:var(--muted); font-size:.9rem}
.split{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap:16px;
  align-items:start;
}
/* Full-width single card layout inside the container */
.split.full{
  grid-template-columns: 1fr;
}

.product{
  display:grid;
  grid-template-columns: .9fr 1.1fr;
  gap:16px;
  align-items:stretch;
  margin-top:16px;
}
.product .media{
  border-radius: var(--radius);
  border:1px solid var(--border);
  background:
    radial-gradient(260px 200px at 20% 30%, rgba(31,120,200,.20), transparent 55%),
    radial-gradient(260px 200px at 75% 55%, rgba(77,163,255,.14), transparent 55%),
    rgba(31,120,200,.03);
  min-height:220px;
  display:flex;
  padding:16px;
  flex-direction:column;
  justify-content:flex-end;
}
.product ul{margin:10px 0 0 18px; color:var(--muted)}
.product li{margin:6px 0}
.form{
  display:grid;
  gap:10px;
}
.input, textarea{
  width:100%;
  padding:12px 12px;
  border-radius: 14px;
  border:1px solid var(--border);
  background: rgba(31,120,200,.03);
  color:var(--text);
  outline:none;
}
textarea{min-height:120px; resize:vertical}
.footer{
  padding:30px 0;
  border-top:1px solid var(--border);
  color:var(--muted);
  font-size:.95rem;
}
.footer a{color:var(--muted); text-decoration:underline}
.note{
  padding:12px 14px;
  border:1px dashed rgba(255,255,255,.25);
  border-radius: var(--radius);
  background: rgba(31,120,200,.03);
  color:var(--muted);
}

@media (max-width: 980px){
  .hero-grid{grid-template-columns:1fr}
  .tiles{grid-template-columns: repeat(2, 1fr)}
  .grid-3{grid-template-columns:1fr}
  .grid-2{grid-template-columns:1fr}
  .split{grid-template-columns:1fr}
  .product{grid-template-columns:1fr}
  .navlinks{display:none}
  .burger{display:inline-flex}
  .mobile{display:block}
}

/* Product image normalization */
.product img,
.product .media img{
  max-width: 360px;
  max-height: 260px;      /* shorter visual height */
  width: 100%;
  height: auto;
  object-fit: contain;
  margin: 8px 0 12px 0;
  border-radius: 14px;
}


/* Header logo optimization */
header .brand img{
  height: 44px;           /* larger primary logo */
  margin-right: 10px;     /* tighter spacing */
}
header .brand img:last-child{
  height: 32px;           /* slogan/logo mark */
  margin-right: 0;
}

/* Center product hero image (cdc_damper) */
.media-img{
  display:flex;
  justify-content:center;
  align-items:center;
  width:100%;
  margin-bottom:10px;
}

.media-img img{
  display:block;
  max-width:420px;     /* 你想要更大就改这里，比如 520px */
  width:100%;
  height:auto;
  object-fit:contain;
  border-radius:18px;
}