/* ==========================================================
   www.mpkdna.com · 超声无损检测团队官网
   风格来源：产品彩页（蓝紫渐变横幅 + 品牌蓝 #2E7BE6）
   ========================================================== */
:root{
  --blue:#2E7BE6;
  --blue-dark:#1C5FB0;
  --ink:#18191C;
  --dim:#8A8F98;
  --line:#E6E8EB;
  --bg:#F5F6F8;
  --card:#FFFFFF;
  --g1:#4C5FC4;
  --g2:#6B54B4;
  --g3:#8E4B9E;
  --radius:14px;
  --shadow:0 1px 2px rgba(16,24,40,.05),0 8px 24px rgba(16,24,40,.06);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:-apple-system,"Segoe UI","Microsoft YaHei","PingFang SC",sans-serif;
  font-size:15px;line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:none;opacity:.85}
.container{max-width:1120px;margin:0 auto;padding:0 24px}

/* ---------- 顶栏 ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.92);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;gap:14px;height:64px}
.brand{display:flex;align-items:center;gap:12px;color:var(--ink)}
.brand img{height:38px;width:auto}
.brand .b1{font-weight:700;font-size:16px;letter-spacing:.5px;line-height:1.3}
.brand .b2{font-size:11.5px;color:var(--dim);letter-spacing:1.5px}
.nav{margin-left:auto;display:flex;gap:6px}
.nav a{
  padding:8px 14px;border-radius:8px;color:#4A4F58;font-size:14px;font-weight:500;
  transition:all .18s;
}
.nav a:hover{background:#EEF4FD;color:var(--blue)}
.nav a.on{background:var(--blue);color:#fff}
@media (max-width:760px){
  .brand .b2{display:none}
  .nav a{padding:8px 9px;font-size:13px}
}

/* ---------- Hero（彩页蓝紫渐变） ---------- */
.hero{
  position:relative;color:#fff;overflow:hidden;
  background:linear-gradient(118deg,var(--g1) 0%,var(--g2) 52%,var(--g3) 100%);
}
.hero::before{
  content:"";position:absolute;inset:0;
  background:repeating-linear-gradient(115deg,rgba(255,255,255,.045) 0 2px,transparent 2px 90px);
  pointer-events:none;
}
.hero-inner{position:relative;padding:96px 0 88px}
.hero .eyebrow{
  display:inline-block;font-size:13px;letter-spacing:2.5px;
  border:1px solid rgba(255,255,255,.45);border-radius:999px;
  padding:5px 16px;margin-bottom:22px;color:rgba(255,255,255,.92);
}
.hero h1{
  margin:0 0 6px;font-size:46px;line-height:1.25;font-weight:700;letter-spacing:.5px;
}
.hero .en{font-size:13px;letter-spacing:3px;color:rgba(255,255,255,.62);margin-bottom:18px;text-transform:uppercase}
.hero p.lead{max-width:720px;font-size:16.5px;line-height:1.9;color:rgba(255,255,255,.88);margin:0 0 30px}
.hero .tags{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:34px}
.hero .tags span{
  background:rgba(255,255,255,.13);border:1px solid rgba(255,255,255,.28);
  border-radius:8px;padding:7px 14px;font-size:13.5px;
}
.btn{
  display:inline-block;border-radius:9px;padding:12px 26px;font-size:15px;font-weight:600;
  transition:all .18s;cursor:pointer;
}
.btn-light{background:#fff;color:var(--blue-dark)}
.btn-light:hover{transform:translateY(-1px);box-shadow:0 6px 18px rgba(0,0,0,.18);opacity:1}
.btn-ghost{border:1px solid rgba(255,255,255,.55);color:#fff;margin-left:12px}
.btn-ghost:hover{background:rgba(255,255,255,.12);opacity:1}
@media (max-width:760px){
  .hero-inner{padding:64px 0 60px}
  .hero h1{font-size:30px}
  .btn-ghost{margin-left:8px}
}

/* ---------- 区块通用 ---------- */
section.block{padding:72px 0}
section.block.alt{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{text-align:center;margin-bottom:44px}
.sec-head .kicker{
  color:var(--blue);font-size:12.5px;font-weight:700;letter-spacing:2.5px;
  text-transform:uppercase;margin-bottom:8px;
}
.sec-head h2{margin:0;font-size:30px;letter-spacing:-.3px}
.sec-head p{color:var(--dim);margin:10px auto 0;max-width:640px;font-size:14.5px}

/* ---------- 产品卡 ---------- */
.products{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
@media (max-width:960px){.products{grid-template-columns:1fr}}
.p-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column;
  transition:transform .2s,box-shadow .2s;
}
.p-card:hover{transform:translateY(-4px);box-shadow:0 4px 8px rgba(16,24,40,.06),0 18px 40px rgba(16,24,40,.12)}
.p-card .thumb{
  background:#0B0C0E;display:flex;align-items:center;justify-content:center;
  padding:26px;height:230px;
}
.p-card .thumb img{max-height:100%;object-fit:contain}
.p-card .body{padding:22px 22px 24px;display:flex;flex-direction:column;flex:1}
.p-card .model{
  display:inline-block;align-self:flex-start;color:var(--blue-dark);
  background:#EAF2FD;border-radius:6px;font-weight:700;font-size:13px;
  padding:3px 10px;margin-bottom:10px;letter-spacing:.5px;
}
.p-card h3{margin:0 0 8px;font-size:19px;line-height:1.45}
.p-card p{color:#5B616B;font-size:13.5px;margin:0 0 16px;flex:1}
.p-card .meta{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px}
.p-card .meta i{
  font-style:normal;font-size:12px;color:#4A4F58;background:#F2F3F5;
  border-radius:5px;padding:3px 8px;
}
.p-card .more{font-weight:600;font-size:14px}
.p-card .more .dl{margin-left:12px;font-weight:400;color:var(--dim);font-size:12.5px}

/* ---------- 应用领域 ---------- */
.apps{display:grid;grid-template-columns:repeat(7,1fr);gap:14px}
@media (max-width:960px){.apps{grid-template-columns:repeat(4,1fr)}}
@media (max-width:560px){.apps{grid-template-columns:repeat(3,1fr)}}
.app{
  background:var(--card);border:1px solid var(--line);border-radius:12px;
  padding:22px 10px 18px;text-align:center;transition:all .18s;
}
.app:hover{border-color:rgba(46,123,230,.45);box-shadow:var(--shadow);transform:translateY(-2px)}
.app img{width:42px;height:42px;margin:0 auto 10px}
.app span{font-size:13px;font-weight:600;color:#3A3F47}

/* ---------- 技术要点 ---------- */
.feats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
@media (max-width:960px){.feats{grid-template-columns:repeat(2,1fr)}}
@media (max-width:560px){.feats{grid-template-columns:1fr}}
.feat{
  background:var(--card);border:1px solid var(--line);border-radius:12px;
  padding:22px;transition:all .18s;
}
.feat:hover{border-color:rgba(46,123,230,.45);box-shadow:var(--shadow)}
.feat img{width:34px;height:34px;margin-bottom:12px}
.feat h3{margin:0 0 6px;font-size:15.5px}
.feat p{margin:0;color:#5B616B;font-size:13px;line-height:1.75}

/* ---------- 产品页 ---------- */
.p-hero{position:relative;color:#fff;overflow:hidden;
  background:linear-gradient(118deg,var(--g1) 0%,var(--g2) 55%,var(--g3) 100%);}
.p-hero::before{content:"";position:absolute;inset:0;
  background:repeating-linear-gradient(115deg,rgba(255,255,255,.045) 0 2px,transparent 2px 90px);}
.p-hero .inner{position:relative;display:flex;align-items:center;gap:44px;padding:64px 0}
.p-hero h1{margin:0 0 4px;font-size:36px;letter-spacing:.3px}
.p-hero .sub{color:rgba(255,255,255,.85);font-size:16px;margin:0 0 14px}
.p-hero .spec{display:flex;flex-wrap:wrap;gap:10px}
.p-hero .spec span{
  background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.3);
  border-radius:8px;padding:6px 13px;font-size:13.5px;
}
.p-hero .visual{margin-left:auto;flex:0 0 380px;max-width:380px}
.p-hero .visual .frame{
  background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.22);
  border-radius:16px;padding:22px;backdrop-filter:blur(2px);
}
@media (max-width:860px){
  .p-hero .inner{flex-direction:column;align-items:flex-start;padding:48px 0}
  .p-hero .visual{margin:0;max-width:100%}
  .p-hero h1{font-size:27px}
}
.crumb{font-size:13px;color:rgba(255,255,255,.7);margin-bottom:14px}
.crumb a{color:rgba(255,255,255,.85)}

/* 概述 + 特点 */
.split{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:start}
@media (max-width:860px){.split{grid-template-columns:1fr}}
.split h2{margin:0 0 14px;font-size:24px}
.split .desc{color:#4A4F58;font-size:15px;margin:0 0 18px}
.checks{list-style:none;margin:0;padding:0}
.checks li{
  position:relative;padding:0 0 12px 30px;color:#3A3F47;font-size:14.5px;
}
.checks li::before{
  content:"";position:absolute;left:0;top:3px;width:19px;height:19px;
  background:url("../icons/ic-check.svg") no-repeat center/contain;
}
.badge-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media (max-width:480px){.badge-grid{grid-template-columns:1fr}}
.badge{
  background:var(--card);border:1px solid var(--line);border-radius:12px;
  padding:18px 16px;
}
.badge img{width:28px;height:28px;margin-bottom:10px}
.badge b{display:block;font-size:14.5px;margin-bottom:4px}
.badge span{color:#5B616B;font-size:12.5px}

/* ---------- 参数表 ---------- */
.spec-table{width:100%;border-collapse:collapse;background:#fff;
  border:1px solid var(--line);border-radius:12px;overflow:hidden;
  box-shadow:var(--shadow);font-size:13.5px;}
.spec-table th,.spec-table td{padding:10px 16px;border-bottom:1px solid #F0F1F3;text-align:left;vertical-align:top}
.spec-table tr:last-child td{border-bottom:none}
.spec-table thead th{
  background:linear-gradient(118deg,var(--g1),var(--g2));color:#fff;
  font-size:13px;letter-spacing:1px;
}
.spec-table td.k{width:34%;font-weight:600;color:#2A2E35;white-space:nowrap}
.spec-table td.v{color:#4A4F58}
.spec-table tr.group td{
  background:#F0F6FE;color:var(--blue-dark);font-weight:700;font-size:12.5px;
  letter-spacing:1.5px;
}
.table-note{color:var(--dim);font-size:12.5px;margin:10px 2px 0}
.table-wrap{overflow-x:auto}

/* ---------- 模块卡（DTR500） ---------- */
.mods{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-bottom:16px}
@media (max-width:860px){.mods{grid-template-columns:1fr}}
.mod{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px 20px 18px}
.mod .tag{
  display:inline-block;background:#0B6E4F;color:#fff;border-radius:5px;
  font-size:11px;font-weight:700;letter-spacing:1px;padding:2px 9px;margin-bottom:10px;
}
.mod .tag.rx{background:var(--blue-dark)}
.mod h3{margin:0 0 4px;font-size:18px}
.mod .range{color:var(--blue);font-weight:700;font-size:13.5px;margin-bottom:8px}
.mod p{margin:0;color:#5B616B;font-size:12.5px;line-height:1.7}

/* ---------- 对比图 ---------- */
.compare{background:#fff;border:1px solid var(--line);border-radius:14px;
  box-shadow:var(--shadow);overflow:hidden;margin-bottom:22px}
.compare .cap{padding:16px 22px 0}
.compare .cap h3{margin:0 0 3px;font-size:16.5px}
.compare .cap p{margin:0;color:var(--dim);font-size:12.5px}
.compare .imgbox{padding:18px 22px 22px}
.compare .imgbox img{width:100%;border:1px solid var(--line);border-radius:8px}
.compare figcaption{margin:0}

/* ---------- 联系区 ---------- */
.contact{
  background:linear-gradient(118deg,var(--g1) 0%,var(--g2) 55%,var(--g3) 100%);
  color:#fff;position:relative;overflow:hidden;
}
.contact::before{content:"";position:absolute;inset:0;
  background:repeating-linear-gradient(115deg,rgba(255,255,255,.04) 0 2px,transparent 2px 90px);}
.contact .inner{position:relative;padding:60px 0;text-align:center}
.contact h2{margin:0 0 8px;font-size:26px}
.contact p.sub{color:rgba(255,255,255,.82);margin:0 0 28px;font-size:14.5px}
.contact-cards{display:flex;justify-content:center;gap:16px;flex-wrap:wrap}
.c-card{
  display:flex;align-items:center;gap:12px;
  background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.3);
  border-radius:12px;padding:14px 22px;min-width:220px;text-align:left;
}
.c-card img{width:26px;height:26px;filter:brightness(0) invert(1)}
.c-card .k{font-size:11.5px;color:rgba(255,255,255,.65);letter-spacing:1px}
.c-card .v{font-size:15.5px;font-weight:600;color:#fff}
.c-card .v small{font-weight:400;font-size:11.5px;color:rgba(255,255,255,.75)}

/* ---------- 页脚 ---------- */
.site-footer{background:#fff;border-top:1px solid var(--line)}
.footer-inner{
  display:flex;align-items:center;gap:14px;padding:26px 0;flex-wrap:wrap;
  color:var(--dim);font-size:13px;
}
.footer-inner img{height:30px;width:auto}
.footer-inner .right{margin-left:auto}
.footer-inner .ic{font-size:11.5px}
@media (max-width:640px){.footer-inner .right{margin-left:0}}