/* ============================================================
   顺心机械设备公司 — https://www.detroitfdj.cn/
   官方视觉参照：Detroit Diesel 官方视觉：深黑 #141416 + 钢蓝 #4C7AA3
   主色 #4C7AA3 / 深底 #141416 / 强调 #2F5578
   ============================================================ */

:root{
  --bd-red:#4C7AA3; --bd-red-dk:#2F5578; --bd-red-lt:#E9F0F6;
  --bd-ink:#141416; --bd-ink2:#3A3A40; --bd-ink3:#6E6E78;
  --bd-line:#E2E2E6; --bd-line2:#F0F0F3;
  --bd-bg:#FFFFFF; --bd-bg-soft:#F6F6F8; --bd-bg-deep:#141416;
  --bd-safety:#4C7AA3; --bd-ok:#0A8F4C; --bd-amber:#D98A00;
  --r:2px; --r-lg:3px;
  --sh:0 1px 8px rgba(20,20,22,.06);
  --sh-l:0 14px 40px rgba(20,20,22,.12);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:76px;-webkit-text-size-adjust:100%}
body{
  font-family:"Helvetica Neue","Hiragino Kaku Gothic ProN","PingFang SC","Microsoft YaHei",Arial,sans-serif;
  font-size:15.5px;line-height:1.8;color:var(--bd-ink);background:var(--bd-bg);
  -webkit-font-smoothing:antialiased;
}
img,svg{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
.wrap{max-width:1220px;margin:0 auto;padding:0 24px}
h1,h2,h3,h4{line-height:1.28;letter-spacing:-.008em}
strong{font-weight:800}

/* ===== 顶栏 ===== */
.bd-top{background:var(--bd-ink);color:rgba(255,255,255,.68);font-size:12.5px}
.bd-top-in{display:flex;flex-wrap:wrap;gap:22px;align-items:center;padding:8px 24px}
.bd-top-i b{color:#fff;font-weight:800}
.bd-top-in .bd-top-i:last-child{margin-left:auto;color:rgba(255,255,255,.55)}
.bd-top-badge{display:inline-flex;align-items:center;gap:6px;background:var(--bd-red);
  padding:3px 10px;font-weight:800;color:#fff;letter-spacing:.04em}

/* ===== 导航 ===== */
.bd-head{position:sticky;top:0;z-index:60;background:#fff;
  box-shadow:0 1px 0 var(--bd-line),0 4px 16px rgba(20,20,22,.05)}
.bd-nav-in{display:flex;align-items:center;gap:20px;height:70px}
.bd-logo{display:flex;align-items:center;gap:12px;flex:none}
.bd-logo-mark{height:31px;width:auto}
.bd-logo-tx{border-left:1px solid var(--bd-line);padding-left:12px}
.bd-logo-tx b{display:block;font-size:14.5px;font-weight:900;color:var(--bd-ink);line-height:1.25}
.bd-logo-tx small{display:block;font-size:11px;color:var(--bd-ink3);font-weight:700;margin-top:1px}
.bd-nav{display:flex;align-items:center;gap:1px;margin-left:auto;flex-wrap:wrap}
.bd-nav a{font-size:13.5px;font-weight:700;color:var(--bd-ink2);padding:9px 11px;
  border-radius:2px;transition:.18s;white-space:nowrap}
.bd-nav a:hover{color:var(--bd-red);background:var(--bd-red-lt)}
.bd-nav a.on{color:var(--bd-red);background:var(--bd-red-lt)}
.bd-btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;font-weight:800;border-radius:2px;
  transition:.2s;border:0;cursor:pointer;font-family:inherit;font-size:14px;padding:11px 20px;line-height:1.4}
.bd-btn-primary{background:var(--bd-red);color:#fff;box-shadow:0 3px 10px #4C7AA33D}
.bd-btn-primary:hover{background:var(--bd-red-dk);transform:translateY(-1px);box-shadow:0 7px 20px #4C7AA352}
.bd-btn-ghost{background:rgba(255,255,255,.1);color:#fff;border:1px solid rgba(255,255,255,.36)}
.bd-btn-ghost:hover{background:rgba(255,255,255,.2)}
.bd-btn-light{background:#fff;color:var(--bd-ink);border:1px solid var(--bd-line)}
.bd-btn-light:hover{border-color:var(--bd-red);color:var(--bd-red);background:var(--bd-red-lt)}
.bd-btn-dark{background:var(--bd-ink);color:#fff}
.bd-btn-dark:hover{background:#000;transform:translateY(-1px)}
.bd-btn-lg{padding:14px 26px;font-size:15px}
.bd-btn-block{width:100%}
.bd-btn svg{width:16px;height:16px;fill:currentColor}
.bd-burger{display:none;width:42px;height:38px;border:0;background:none;cursor:pointer;
  flex-direction:column;justify-content:center;align-items:center;gap:5px;padding:0}
.bd-burger span{display:block;width:22px;height:2px;background:var(--bd-ink);transition:.24s}
.bd-burger.on span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.bd-burger.on span:nth-child(2){opacity:0}
.bd-burger.on span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.bd-mnav{display:none;background:#fff;border-top:1px solid var(--bd-line);box-shadow:var(--sh-l)}
.bd-mnav.on{display:block}
.bd-mnav a{display:block;padding:12px 24px;font-size:14.5px;font-weight:700;
  color:var(--bd-ink2);border-bottom:1px solid var(--bd-line2)}
.bd-mnav a:hover{background:var(--bd-red-lt);color:var(--bd-red)}
.bd-mnav .bd-tel{color:var(--bd-red);font-weight:900;text-align:center;border-bottom:0;padding:14px}

/* ===== Hero ===== */
.bd-hero{background:var(--bd-bg-deep);color:#fff;position:relative;overflow:hidden}
.bd-hero::before{content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);
  background-size:60px 60px;pointer-events:none}
.bd-hero::after{content:"";position:absolute;right:-120px;top:-120px;width:440px;height:440px;
  border:70px solid rgba(230,0,18,.1);border-radius:50%;pointer-events:none}
.bd-hero-in{position:relative;display:grid;grid-template-columns:1.35fr .9fr;
  gap:52px;align-items:center;padding:76px 24px 82px}
.bd-kicker{display:inline-block;font-size:11.5px;font-weight:800;letter-spacing:.16em;
  text-transform:uppercase;color:#9DBEDB;border-left:3px solid var(--bd-red);padding-left:10px;margin-bottom:20px}
.bd-hero h1{font-size:44px;font-weight:900;letter-spacing:-.026em;line-height:1.16;margin-bottom:16px}
.bd-hero h1 em{font-style:normal;color:#7FA8C9}
.bd-hero-en{font-size:13px;font-weight:700;letter-spacing:.07em;color:rgba(255,255,255,.5);margin-bottom:20px}
.bd-lead{font-size:16px;line-height:1.86;color:var(--bd-ink2)}
.bd-hero .bd-lead{color:rgba(255,255,255,.84);font-size:16.5px}
.bd-hero .bd-lead strong{color:#fff}
.bd-tags{display:flex;flex-wrap:wrap;gap:8px;margin:24px 0 28px}
.bd-tags li{font-size:12.5px;font-weight:800;padding:6px 13px;border-radius:2px;
  background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);color:#fff}
.bd-tags li b{color:#7FA8C9;font-weight:900}
.bd-hero-acts{display:flex;flex-wrap:wrap;gap:12px}
.bd-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:2px;margin-top:40px;
  background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.12)}
.bd-stats>div{background:rgba(0,0,0,.32);padding:16px 14px}
.bd-stats b{display:block;font-size:26px;font-weight:900;color:#fff;letter-spacing:-.02em;line-height:1.2}
.bd-stats span{font-size:11.5px;color:rgba(255,255,255,.55);font-weight:700}

/* Hero 侧栏 */
.bd-hero-panel{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.14)}
.bd-hero-panel-hd{font-size:11.5px;font-weight:900;letter-spacing:.14em;text-transform:uppercase;
  color:#9DBEDB;padding:14px 20px;border-bottom:1px solid rgba(255,255,255,.14)}
.bd-hero-panel ul{padding:6px 20px 16px}
.bd-hero-panel li{display:flex;justify-content:space-between;align-items:flex-start;gap:14px;
  padding:11px 0;border-bottom:1px solid rgba(255,255,255,.09);font-size:13.5px}
.bd-hero-panel li:last-child{border-bottom:0}
.bd-hero-panel .k{color:rgba(255,255,255,.65);font-weight:700;flex:none}
.bd-hero-panel .v{color:#fff;font-weight:900;text-align:right}
.bd-hero-panel .v small{display:block;font-size:11px;color:rgba(255,255,255,.48);font-weight:600;margin-top:1px}

/* ===== 区块通用 ===== */
.bd-sec{padding:82px 0}
.bd-sec-alt{background:var(--bd-bg-soft)}
.bd-sec-deep{background:var(--bd-ink);color:#fff}
.bd-sec-deep .bd-lead{color:rgba(255,255,255,.78)}
.bd-sec-deep .bd-h2{color:#fff}
.bd-sec-deep .bd-eyebrow{color:#9DBEDB}
.bd-h2{font-size:32px;font-weight:900;color:var(--bd-ink);margin-bottom:16px;letter-spacing:-.02em}
.bd-h3{font-size:21px;font-weight:800;color:var(--bd-ink);margin-bottom:12px}
.bd-eyebrow{font-size:11.5px;font-weight:900;letter-spacing:.16em;text-transform:uppercase;
  color:var(--bd-red);margin-bottom:12px}
.bd-sec-head{max-width:840px;margin-bottom:44px}
.bd-sec-head.center{margin-left:auto;margin-right:auto;text-align:center}
.bd-sec-head .bd-lead{font-size:16.5px}
.bd-rule{height:3px;width:52px;background:var(--bd-red);margin:0 0 20px}
.bd-sec-head.center .bd-rule{margin:0 auto 20px}

.bd-split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}
.bd-split-even{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.bd-grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.bd-grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.bd-grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}

/* ===== 卡片 ===== */
.bd-card{background:#fff;border:1px solid var(--bd-line);padding:26px 26px 28px;transition:.22s}
.bd-card:hover{border-color:var(--bd-red);box-shadow:var(--sh-l);transform:translateY(-2px)}
.bd-card h3{font-size:17px;font-weight:800;color:var(--bd-ink);margin-bottom:8px}
.bd-card h4{font-size:15.5px;font-weight:800;color:var(--bd-ink);margin-bottom:6px}
.bd-card p{font-size:13.8px;line-height:1.78;color:var(--bd-ink2)}
.bd-card .n{font-size:12px;font-weight:900;letter-spacing:.12em;color:var(--bd-red);display:block;margin-bottom:8px}
.bd-lnk{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:800;
  color:var(--bd-red);margin-top:14px}
.bd-lnk svg{width:14px;height:14px;fill:currentColor;transition:.2s}
.bd-lnk:hover svg{transform:translateX(3px)}

.bd-svc{background:#fff;border:1px solid var(--bd-line);border-top:3px solid var(--bd-ink);
  padding:28px 26px 30px;transition:.22s;display:flex;flex-direction:column}
.bd-svc:hover{border-top-color:var(--bd-red);box-shadow:var(--sh-l);transform:translateY(-3px)}
.bd-svc-ic{width:44px;height:44px;background:var(--bd-ink);color:#fff;display:grid;place-items:center;
  margin-bottom:16px;border-radius:2px}
.bd-svc-ic svg{width:22px;height:22px;fill:currentColor}
.bd-svc h3{font-size:18px;font-weight:900;color:var(--bd-ink);margin-bottom:9px}
.bd-svc p{font-size:13.8px;line-height:1.8;color:var(--bd-ink2);margin-bottom:14px}
.bd-svc-ls{margin-bottom:6px}
.bd-svc-ls li{display:flex;align-items:flex-start;gap:8px;font-size:13px;color:var(--bd-ink2);
  padding:5px 0;font-weight:600}
.bd-svc-ls svg{width:14px;height:14px;fill:var(--bd-ok);flex:none;margin-top:4px}

/* ===== 勾选清单（伪元素绘制，文字按正常文档流换行） ===== */
.bd-check li{
  position:relative;padding:7px 0 7px 27px;
  font-size:14px;line-height:1.72;color:var(--bd-ink2);font-weight:600;
}
.bd-check li::before{
  content:"";position:absolute;left:0;top:11px;
  width:14px;height:14px;border:2px solid var(--bd-red);
}
.bd-check li::after{
  content:"";position:absolute;left:4px;top:14px;
  width:6px;height:3px;border-left:2px solid var(--bd-ink);
  border-bottom:2px solid var(--bd-ink);transform:rotate(-45deg);
}
.bd-check li b{color:var(--bd-ink);font-weight:800}
.bd-check li svg{display:none}

/* ===== 事实表 ===== */
.bd-facts{border:1px solid var(--bd-line);background:#fff}
.bd-facts>div{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;
  padding:13px 18px;border-bottom:1px solid var(--bd-line2)}
.bd-facts>div:last-child{border-bottom:0}
.bd-facts .k{font-size:13px;color:var(--bd-ink3);font-weight:700;flex:none}
.bd-facts .v{font-size:14px;font-weight:800;color:var(--bd-ink);text-align:right}
.bd-facts .v small{display:block;font-size:11.5px;color:var(--bd-ink3);font-weight:600;margin-top:1px}

/* ===== 强调框 ===== */
.bd-box{background:#fff;border:1px solid var(--bd-line);border-left:3px solid var(--bd-ink);padding:24px 26px}
.bd-box-accent{background:var(--bd-red-lt);border-color:#C6DAEA;border-left-color:var(--bd-red)}
.bd-box h4{font-size:16px;font-weight:800;color:var(--bd-ink);margin-bottom:9px}
.bd-box p{font-size:14px;line-height:1.82;color:var(--bd-ink2)}
.bd-box p b{color:var(--bd-red)}

/* ===== 表格 ===== */
.bd-tbl-wrap{background:#fff;border:1px solid var(--bd-line);margin-bottom:24px}
.bd-tbl-hd{display:flex;justify-content:space-between;align-items:center;gap:16px;
  padding:15px 20px;border-bottom:1px solid var(--bd-line);flex-wrap:wrap}
.bd-tbl-hd h3{font-size:17px;font-weight:800;color:var(--bd-ink)}
.bd-tbl-hd span{font-size:11px;font-weight:800;letter-spacing:.11em;color:var(--bd-ink3);text-transform:uppercase}
.bd-tbl-scroll{overflow-x:auto}
.bd-tbl{width:100%;border-collapse:collapse;font-size:13.5px;min-width:660px}
.bd-tbl th{background:var(--bd-ink);font-size:12px;font-weight:800;color:#fff;
  text-align:left;padding:11px 14px;border-bottom:1px solid var(--bd-ink);white-space:nowrap;letter-spacing:.02em}
.bd-tbl td{padding:11px 14px;border-bottom:1px solid var(--bd-line2);color:var(--bd-ink2);line-height:1.68;vertical-align:top}
.bd-tbl tbody tr:hover{background:var(--bd-bg-soft)}
.bd-tbl tbody tr:last-child td{border-bottom:0}
.bd-tbl td b{color:var(--bd-ink);font-weight:800}
.bd-tbl td.bd-num{text-align:right;white-space:nowrap;font-variant-numeric:tabular-nums}
.bd-tbl td.bd-code{font-family:"Consolas","SF Mono",Menlo,monospace;font-size:12.5px;
  color:var(--bd-red);font-weight:700;white-space:nowrap}
.bd-tbl-note{padding:12px 20px;font-size:12.5px;color:var(--bd-ink3);line-height:1.75;
  background:#FAFAFB;border-top:1px solid var(--bd-line2)}
.bd-tbl-note b{color:var(--bd-red)}

/* ===== 机型卡 ===== */
.bd-eng{background:#fff;border:1px solid var(--bd-line);overflow:hidden;
  transition:.22s;display:flex;flex-direction:column}
.bd-eng:hover{border-color:var(--bd-red);box-shadow:var(--sh-l);transform:translateY(-2px)}
.bd-eng-hd{background:var(--bd-ink);color:#fff;padding:16px 20px;display:flex;
  justify-content:space-between;align-items:flex-start;gap:14px}
.bd-eng-hd h3{font-size:18px;font-weight:900;letter-spacing:-.008em}
.bd-eng-hd span{font-size:11.5px;font-weight:700;color:rgba(255,255,255,.66);text-align:right;flex:none}
.bd-kv{padding:16px 20px;flex:1}
.bd-eng .bd-kv dt{display:grid;grid-template-columns:88px 1fr;gap:10px;
  padding:6px 0;border-bottom:1px dashed var(--bd-line2)}
.bd-eng .bd-kv dt{font-size:12.5px;color:var(--bd-ink3);font-weight:700;margin:0}
.bd-eng .bd-kv dd{font-size:13px;color:var(--bd-ink);font-weight:700;margin:0;text-align:right}
.bd-eng-note{padding:12px 20px;font-size:12.5px;color:var(--bd-ink3);line-height:1.72;
  background:var(--bd-bg-soft);border-top:1px solid var(--bd-line2)}

/* ===== 应用卡 ===== */
.bd-app{background:#fff;border:1px solid var(--bd-line);padding:22px 22px 24px;transition:.2s}
.bd-app:hover{border-color:var(--bd-red)}
.bd-app h4{font-size:16px;font-weight:800;color:var(--bd-ink);margin-bottom:3px}
.bd-app .en{font-size:11px;font-weight:800;letter-spacing:.1em;color:var(--bd-red);
  text-transform:uppercase;margin-bottom:10px}
.bd-app p{font-size:13.5px;line-height:1.78;color:var(--bd-ink2)}

/* ===== FAQ ===== */
.bd-faq{background:#fff;border:1px solid var(--bd-line)}
.bd-faq-item{border-bottom:1px solid var(--bd-line2)}
.bd-faq-item:last-child{border-bottom:0}
.bd-faq-item summary{display:flex;align-items:flex-start;gap:14px;padding:17px 22px;cursor:pointer;
  list-style:none;font-size:15px;font-weight:700;color:var(--bd-ink);transition:.18s}
.bd-faq-item summary::-webkit-details-marker{display:none}
.bd-faq-item summary:hover{background:var(--bd-red-lt)}
.bd-faq-q{flex:1}
.bd-faq-ic{width:18px;height:18px;flex:none;position:relative;margin-top:4px}
.bd-faq-ic::before,.bd-faq-ic::after{content:"";position:absolute;background:var(--bd-red);
  transition:.24s;left:50%;top:50%}
.bd-faq-ic::before{width:14px;height:2px;transform:translate(-50%,-50%)}
.bd-faq-ic::after{width:2px;height:14px;transform:translate(-50%,-50%)}
.bd-faq-item[open] .bd-faq-ic::after{transform:translate(-50%,-50%) scaleY(0)}
.bd-faq-a{padding:0 22px 20px 54px;font-size:14px;line-height:1.86;color:var(--bd-ink2)}
.bd-faq-a p{margin-bottom:10px}

/* ===== 表单 ===== */
.bd-form{background:#fff;border:1px solid var(--bd-line);padding:30px 30px 32px}
.bd-form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:16px}
.bd-field label{display:block;font-size:13px;font-weight:800;color:var(--bd-ink);margin-bottom:7px}
.bd-field label span{color:var(--bd-red)}
.bd-field input,.bd-field select,.bd-field textarea{
  width:100%;border:1px solid var(--bd-line);border-radius:2px;padding:11px 13px;
  font-size:14px;font-family:inherit;color:var(--bd-ink);background:#fff;transition:.18s}
.bd-field input:focus,.bd-field select:focus,.bd-field textarea:focus{
  outline:0;border-color:var(--bd-red);box-shadow:0 0 0 3px rgba(230,0,18,.08)}
.bd-field textarea{min-height:104px;resize:vertical}
.bd-field input.err,.bd-field select.err,.bd-field textarea.err{border-color:var(--bd-red)}
.bd-form-note{margin-top:12px;font-size:12.5px;color:var(--bd-ink3);line-height:1.7}

/* ===== CTA 带 ===== */
.bd-cta-band{background:var(--bd-red);color:#fff;padding:52px 0;position:relative;overflow:hidden}
.bd-cta-band::before{content:"";position:absolute;right:-60px;top:-60px;width:340px;height:340px;
  border:56px solid rgba(255,255,255,.08);border-radius:50%}
.bd-cta-in{position:relative;display:flex;justify-content:space-between;align-items:center;
  gap:34px;flex-wrap:wrap}
.bd-cta-in h2{font-size:27px;font-weight:900;line-height:1.36;margin-bottom:9px}
.bd-cta-in p{font-size:14px;color:rgba(255,255,255,.78)}
.bd-cta-acts{display:flex;gap:12px;flex-wrap:wrap}

/* ===== 页头（内页） ===== */
.bd-phead{background:var(--bd-ink);color:#fff;padding:44px 0 46px;position:relative;overflow:hidden}
.bd-phead::before{content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);background-size:56px 56px}
.bd-phead::after{content:"";position:absolute;right:-80px;top:-80px;width:280px;height:280px;
  border:44px solid rgba(230,0,18,.12);border-radius:50%}
.bd-phead .wrap{position:relative}
.bd-crumb{font-size:12px;font-weight:700;color:rgba(255,255,255,.58);margin-bottom:14px}
.bd-crumb a{color:#9DBEDB}
.bd-crumb a:hover{text-decoration:underline}
.bd-phead h1{font-size:33px;font-weight:900;letter-spacing:-.022em;margin-bottom:12px}
.bd-phead .bd-lead{color:rgba(255,255,255,.8);max-width:820px;font-size:15.5px}
.bd-phead-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}
.bd-phead-tags li{font-size:12px;font-weight:800;padding:5px 12px;background:rgba(255,255,255,.1);
  border:1px solid rgba(255,255,255,.18);border-radius:2px}

/* ===== 二手回收模块 ===== */
.bd-used-hero{background:linear-gradient(135deg,#0E0E10,#141416 55%,#1C2A38);color:#fff;
  padding:70px 0 74px;position:relative;overflow:hidden}
.bd-used-hero::before{content:"";position:absolute;inset:0;
  background-image:radial-gradient(circle at 1px 1px,rgba(230,0,18,.11) 1px,transparent 0);
  background-size:26px 26px}
.bd-used-hero .wrap{position:relative}
.bd-used-hero h1{font-size:40px;font-weight:900;letter-spacing:-.024em;margin-bottom:16px}
.bd-used-hero .bd-lead{color:rgba(255,255,255,.84);max-width:880px;font-size:16.5px}
.bd-used-hero .bd-lead strong{color:#fff}

.bd-factor{background:#fff;border:1px solid var(--bd-line);border-top:3px solid var(--bd-red);
  padding:24px 24px 26px}
.bd-factor .k{font-size:16px;font-weight:900;color:var(--bd-ink);margin-bottom:4px}
.bd-factor .v{font-size:12.5px;font-weight:900;color:var(--bd-red);letter-spacing:.04em;
  display:inline-block;background:var(--bd-red-lt);padding:3px 10px;border-radius:2px;margin-bottom:12px}
.bd-factor .d{font-size:13.5px;line-height:1.8;color:var(--bd-ink2)}

.bd-grade{background:#fff;border:1px solid var(--bd-line);display:flex;align-items:stretch;transition:.2s}
.bd-grade:hover{border-color:var(--bd-red);box-shadow:var(--sh)}
.bd-grade-g{width:110px;flex:none;background:var(--bd-ink);color:#fff;padding:18px 12px;
  display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center}
.bd-grade-g b{font-size:16px;font-weight:900;line-height:1.3}
.bd-grade-g span{font-size:11px;color:rgba(255,255,255,.62);font-weight:700;margin-top:4px}
.bd-grade-b{flex:1;padding:16px 20px}
.bd-grade-b .k{font-size:13.5px;font-weight:800;color:var(--bd-ink);margin-bottom:3px}
.bd-grade-b .k b{color:var(--bd-red)}
.bd-grade-b .d{font-size:13px;color:var(--bd-ink3);line-height:1.7}

.bd-proc{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.bd-proc-item{background:#fff;border:1px solid var(--bd-line);padding:22px 20px 24px;position:relative}
.bd-proc-n{font-size:34px;font-weight:900;color:#E6E6EA;line-height:1;margin-bottom:8px;letter-spacing:-.04em}
.bd-proc-item h4{font-size:15.5px;font-weight:800;color:var(--bd-ink);margin-bottom:8px}
.bd-proc-item p{font-size:13px;line-height:1.76;color:var(--bd-ink2);margin-bottom:12px}
.bd-proc-item ul li{font-size:12.5px;color:var(--bd-ink3);padding:4px 0 4px 14px;position:relative;line-height:1.6}
.bd-proc-item ul li::before{content:"";position:absolute;left:0;top:11px;width:5px;height:5px;
  background:var(--bd-red);border-radius:50%}

.bd-hazard{background:#fff;border:1px solid var(--bd-line);border-left:3px solid var(--bd-red);
  padding:22px 24px}
.bd-hazard h4{font-size:15.5px;font-weight:800;color:var(--bd-ink);margin-bottom:8px}
.bd-hazard p{font-size:13.5px;line-height:1.8;color:var(--bd-ink2)}

.bd-trade{background:#fff;border:1px solid var(--bd-line);padding:24px 24px 26px;transition:.2s}
.bd-trade:hover{border-color:var(--bd-red);box-shadow:var(--sh-l)}
.bd-trade h4{font-size:16px;font-weight:800;color:var(--bd-red);margin-bottom:9px}
.bd-trade p{font-size:13.5px;line-height:1.8;color:var(--bd-ink2)}

.bd-tip{display:flex;gap:12px;align-items:flex-start;padding:13px 0;border-bottom:1px dashed var(--bd-line2);
  font-size:13.8px;line-height:1.76;color:var(--bd-ink2)}
.bd-tip:last-child{border-bottom:0}
.bd-tip-ic{width:22px;height:22px;flex:none;background:var(--bd-red);color:#fff;border-radius:50%;
  display:grid;place-items:center;font-size:12px;font-weight:900;margin-top:3px}

/* ===== 案例卡 ===== */
.bd-case{background:#fff;border:1px solid var(--bd-line);border-top:3px solid var(--bd-ink);
  padding:26px 26px 28px;transition:.22s}
.bd-case:hover{border-top-color:var(--bd-red);box-shadow:var(--sh-l);transform:translateY(-2px)}
.bd-case-hd{margin-bottom:12px}
.bd-case-cat{display:inline-block;font-size:11px;font-weight:900;letter-spacing:.1em;
  color:var(--bd-red);background:var(--bd-red-lt);padding:3px 10px;border-radius:2px;margin-bottom:10px}
.bd-case h3{font-size:17px;font-weight:800;color:var(--bd-ink);line-height:1.4}
.bd-case p{font-size:13.8px;line-height:1.82;color:var(--bd-ink2);margin-bottom:14px;white-space:pre-line}
.bd-case-meta{display:grid;grid-template-columns:1fr 1fr;gap:8px 16px;padding-top:14px;border-top:1px solid var(--bd-line2)}
.bd-case-meta div{display:flex;justify-content:space-between;gap:10px;font-size:12.5px}
.bd-case-meta span:first-child{color:var(--bd-ink3);font-weight:700}
.bd-case-meta span:last-child{color:var(--bd-ink);font-weight:800;text-align:right}

/* ===== 页脚 ===== */
.bd-foot{background:#0E0E10;color:rgba(255,255,255,.6);font-size:13.5px;padding:56px 0 0}
.bd-foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:36px;padding-bottom:40px}
.bd-foot h5{font-size:13px;font-weight:900;color:#fff;letter-spacing:.06em;margin-bottom:16px;text-transform:uppercase}
.bd-foot-logo{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.bd-foot-logo img{height:25px;width:auto}
.bd-foot-logo span{font-size:12px;color:rgba(255,255,255,.48);font-weight:700;
  border-left:1px solid rgba(255,255,255,.2);padding-left:10px}
.bd-foot p{line-height:1.82;margin-bottom:12px;font-size:13px}
.bd-foot-links li{padding:5px 0}
.bd-foot-links a{font-size:13px;color:rgba(255,255,255,.62);transition:.18s}
.bd-foot-links a:hover{color:#fff}
.bd-foot-links b{color:#fff;font-weight:800}
.bd-foot-bot{border-top:1px solid rgba(255,255,255,.13);padding:18px 0;display:flex;
  justify-content:space-between;gap:18px;flex-wrap:wrap;font-size:12.5px;color:rgba(255,255,255,.4)}
.bd-foot-bot a{color:rgba(255,255,255,.62)}
.bd-top-btn{position:fixed;right:22px;bottom:22px;width:44px;height:44px;border:0;border-radius:2px;
  background:var(--bd-red);color:#fff;display:grid;place-items:center;cursor:pointer;z-index:70;
  opacity:0;visibility:hidden;transition:.24s;box-shadow:0 5px 18px rgba(230,0,18,.3)}
.bd-top-btn.on{opacity:1;visibility:visible}
.bd-top-btn svg{width:20px;height:20px;fill:currentColor}

/* ===== 渐进入场（渐进增强：默认可见） ===== */
.js .reveal{opacity:0;transform:translateY(16px);transition:opacity .55s ease,transform .55s ease}
.js .reveal.in{opacity:1;transform:none}

/* ===== 响应式 ===== */
@media (max-width:1080px){
  .bd-hero-in{grid-template-columns:1fr;gap:34px;padding:56px 24px 60px}
  .bd-hero h1{font-size:36px}
  .bd-split,.bd-split-even,.bd-grid-2{grid-template-columns:1fr}
  .bd-grid-3{grid-template-columns:repeat(2,1fr)}
  .bd-proc{grid-template-columns:repeat(2,1fr)}
  .bd-foot-grid{grid-template-columns:1fr 1fr}
  .bd-nav a{padding:9px 8px;font-size:12.8px}
}
@media (max-width:860px){
  .bd-nav,.bd-head .bd-btn{display:none}
  .bd-burger{display:flex}
  .bd-sec{padding:56px 0}
  .bd-h2{font-size:26px}
  .bd-hero h1{font-size:29px}
  .bd-used-hero h1{font-size:30px}
  .bd-phead h1{font-size:25px}
  .bd-stats{grid-template-columns:repeat(2,1fr)}
  .bd-grid-3,.bd-grid-4{grid-template-columns:1fr}
  .bd-proc{grid-template-columns:1fr}
  .bd-form-row{grid-template-columns:1fr}
  .bd-cta-in h2{font-size:21px}
  .bd-foot-grid{grid-template-columns:1fr;gap:26px}
  .bd-eng .bd-kv dt{grid-template-columns:76px 1fr}
}
@media (max-width:560px){
  .wrap{padding:0 16px}
  .bd-top-in{gap:12px;font-size:11.5px}
  .bd-logo-tx small{display:none}
  .bd-hero-in{padding:44px 16px 48px}
  .bd-hero h1{font-size:25px}
  .bd-hero-en{font-size:11.5px}
  .bd-sec{padding:46px 0}
  .bd-h2{font-size:22px}
  .bd-cta-acts{width:100%}
  .bd-cta-acts .bd-btn{flex:1}
  .bd-grade{flex-direction:column}
  .bd-grade-g{width:100%;flex-direction:row;gap:10px}
  .bd-faq-a{padding-left:22px}
}