:root{
  --bg:#ffffff;
  --text:#111;
  --muted:#555;
  --brand:#c30d23;
  --radius:16px;
}

*{box-sizing:border-box;}

html, body{
  margin:0;
  padding:0;
  background:var(--bg);
  color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;

  /* 不改 index.html 的前提下：禁止子页滚动，避免双滚动条 */
  overflow-y:hidden;
  overflow-x:hidden;
}

/* 卡片容器 */
.product-hero,
.product-card{
  max-width:1200px;
  margin:20px auto;
  padding:20px;
  border-radius:var(--radius);
  background:#fff;
  border:1px solid rgba(0,0,0,.08);
  box-shadow:0 10px 25px rgba(0,0,0,.06);
}

/* Hero */
.product-hero{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:20px;
  align-items:center;
}

.product-hero__image{
  border-radius:12px;
  overflow:hidden;
  border:1px solid rgba(0,0,0,.06);
  background:#fff;
}
.product-hero__image img{
  width:100%;
  display:block;
  object-fit:contain;
}

.product-hero__details h1{
  margin:0 0 10px;
  font-size: clamp(22px, 2.4vw, 34px);
  line-height:1.15;
}

.product-description{
  color:var(--muted);
  line-height:1.7;
}
.product-description p{ margin:0 0 10px; }

/* 标题 */
.product-card h2{
  margin:0 0 14px;
  font-size:20px;
}
.note{
  margin:10px 0 0;
  color:var(--muted);
  font-size:13px;
}

/* 列表条目 */
.bullets{
  list-style:none;
  padding:0;
  margin:0;
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:10px 14px;
}

.bullets li{
  background:#fafafa;
  padding:10px 12px 10px 36px;
  border-radius:12px;
  position:relative;
  border:1px solid rgba(0,0,0,.06);
  transition: transform .12s ease, box-shadow .12s ease, border-color .12s ease;
}
.bullets li:hover{
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(0,0,0,.06);
  border-color: rgba(0,0,0,.10);
}

.bullets--check li::before{
  content:"✓";
  position:absolute;
  left:12px;
  top:10px;
  color:var(--brand);
  font-weight:800;
}

.bullets--dot li::before{
  content:"";
  position:absolute;
  left:14px;
  top:18px;
  width:6px;
  height:6px;
  background:var(--brand);
  border-radius:50%;
}

/* 表格容器 */
.table-wrap{
  overflow-x:auto;
  border:1px solid rgba(0,0,0,.08);
  border-radius:12px;
  background:#fff;
}

/* 通用表格 */
.spec-table{
  width:100%;
  min-width:760px;
  border-collapse:collapse;
}

.spec-table th,
.spec-table td{
  padding:12px;
  border-bottom:1px solid rgba(0,0,0,.08);
  text-align:center;
  vertical-align:middle;
}

.spec-table thead th{
  background:var(--brand);
  color:#fff;
  position:sticky;
  top:0;
  z-index:1;
}

.spec-table tbody tr:nth-child(even){
  background:rgba(0,0,0,.02);
}

/* 传感器前端表：内容多，给一点可读性 */
.spec-table--wide td:nth-child(2){
  line-height:1.75;
}

/* CMRR 更紧凑 */
.spec-table--cmrr th,
.spec-table--cmrr td{
  padding:10px 8px;
  font-size:13px;
}

/* 最大无损差分电压：两列表更窄 */
.spec-table--narrow{
  min-width:520px;
}

/* 共模对比图 */
.figure-card{
  border:1px solid rgba(0,0,0,.08);
  border-radius:12px;
  background:#fff;
  overflow:hidden;
}

.figure-img{
  width:100%;
  height:auto;
  display:block;
}

.figure-caption{
  margin:0;
  padding:12px 14px;
  color:var(--muted);
  font-size:14px;
  line-height:1.6;
  border-top:1px solid rgba(0,0,0,.06);
  background:rgba(0,0,0,.02);
}

/* 下载区域 */
.download-desc{
  color: var(--muted);
  font-size: 14px;
  margin: 0 0 14px;
}

.btn-download{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding: 10px 18px;
  border-radius: 10px;
  background: var(--brand);
  color:#fff;
  text-decoration:none;
  font-size:14px;
  font-weight:600;
  transition: .15s ease;
}
.btn-download:hover{ opacity:.92; }

/* 响应式 */
@media(max-width:900px){
  .product-hero{ grid-template-columns:1fr; }
  .bullets{ grid-template-columns:1fr; }
}