/* 05 b2b-trade — 冷纸白 / 墨蓝 / 信号橙 / 样本册 */
:root{
  --paper:#f5f4f0; --card:#fdfcfa; --sunk:#eae8e2; --sunk2:#dedbd3;
  --ink:#16202b; --ink2:#4a5561; --ink3:#818b96;
  --line:rgba(22,32,43,.12); --line2:rgba(22,32,43,.07);
  --accent:oklch(.58 .15 42); --accent-soft:oklch(.95 .04 42);
  --deep:#101a24;
  --ease:cubic-bezier(.22,.61,.36,1);
  --step:clamp(56px,8vw,116px); --max:1220px;
}
*,*::before,*::after{box-sizing:border-box}
body{margin:0;background:var(--paper);color:var(--ink);
  font:400 clamp(14.5px,1vw,16px)/1.65 ui-sans-serif,"PingFang SC","Microsoft YaHei",sans-serif;
  -webkit-font-smoothing:antialiased;font-feature-settings:"tnum"}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4,p,ul,figure,table{margin:0}
ul{padding:0;list-style:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--max);margin:0 auto;padding-inline:clamp(18px,4.5vw,56px)}
.mono{font-family:ui-monospace,"SF Mono",Consolas,monospace;font-size:11px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--ink3)}
.num{font-variant-numeric:tabular-nums}
.sec{padding-block:var(--step)}
h1{font-size:clamp(1.95rem,4.6vw,3.7rem);line-height:1.08;letter-spacing:-.026em;font-weight:600}
h2{font-size:clamp(1.4rem,2.7vw,2.15rem);line-height:1.2;letter-spacing:-.018em;font-weight:600}
h3{font-size:15px;font-weight:600;letter-spacing:-.006em}
.lede{color:var(--ink2);font-size:clamp(14.5px,1.15vw,16.5px);line-height:1.72;max-width:58ch}

/* 顶栏 */
.top{background:var(--deep);color:#e9eef3;font-size:12px}
.top .wrap{display:flex;align-items:center;gap:18px;height:34px}
.top a{color:#a9b6c2}
.top a:hover{color:#fff}
.top .r{margin-left:auto;display:flex;gap:16px;align-items:center}
.top .r span{color:#6d7d8c}
header{position:sticky;top:0;z-index:50;background:rgba(245,244,240,.92);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line)}
.hd{display:flex;align-items:center;gap:34px;height:66px}
.logo{display:flex;align-items:baseline;gap:9px;font-weight:700;font-size:16px;letter-spacing:-.015em}
.logo em{font-style:normal;color:var(--accent);font-size:11px;letter-spacing:.16em;font-weight:600}
.hd nav{display:flex;gap:26px}
.hd nav a{font-size:14px;color:var(--ink2);padding:4px 0;position:relative}
.hd nav a::after{content:"";position:absolute;left:0;bottom:0;height:2px;width:0;background:var(--accent);transition:width .26s var(--ease)}
.hd nav a:hover,.hd nav a[aria-current]{color:var(--ink)}
.hd nav a:hover::after,.hd nav a[aria-current]::after{width:100%}
.hd .right{margin-left:auto;display:flex;align-items:center;gap:12px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:40px;padding:0 18px;
  border-radius:3px;font-size:13.5px;font-weight:550;border:1px solid transparent;cursor:pointer;
  transition:background .18s,color .18s,border-color .18s}
.btn-p{background:var(--accent);color:#fff}
.btn-p:hover{background:oklch(.53 .15 42)}
.btn-g{background:transparent;border-color:var(--line);color:var(--ink)}
.btn-g:hover{background:var(--sunk)}
.btn-lg{height:46px;padding:0 24px;font-size:14.5px}
@media(max-width:900px){.hd nav{display:none}.top .r{display:none}}

/* 首屏 */
.hero{padding-block:clamp(40px,6vw,76px) clamp(32px,4vw,56px);border-bottom:1px solid var(--line)}
.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:clamp(28px,5vw,64px);align-items:center}
@media(max-width:940px){.hero-grid{grid-template-columns:1fr}}
.kicker{display:inline-flex;align-items:center;gap:9px;border:1px solid var(--line);border-radius:2px;
  padding:5px 11px;font-size:12px;color:var(--ink2);background:var(--card)}
.kicker b{color:var(--accent);font-weight:600}
.hero h1{margin-top:20px}
.hero h1 span{color:var(--accent)}
.hero .lede{margin-top:20px}
.hero-cta{display:flex;gap:10px;flex-wrap:wrap;margin-top:28px}
.hero-facts{display:grid;grid-template-columns:repeat(3,1fr);gap:0;margin-top:40px;border-top:1px solid var(--line)}
.fact{padding:16px 16px 0 0;border-right:1px solid var(--line2)}
.fact:last-child{border-right:0}
.fact b{display:block;font-size:clamp(1.35rem,2.4vw,1.85rem);font-weight:620;letter-spacing:-.02em}
.fact span{display:block;font-size:12px;color:var(--ink3);margin-top:4px}
@media(max-width:620px){.hero-facts{grid-template-columns:1fr}.fact{border-right:0;border-bottom:1px solid var(--line2);padding:14px 0}}

/* 主视觉 */
.visual{position:relative;aspect-ratio:4/3.4;border:1px solid var(--line);background:
  repeating-linear-gradient(135deg,var(--sunk) 0 2px,transparent 2px 12px),var(--card);overflow:hidden}
.visual .plate{position:absolute;inset:auto 0 0 0;height:52%;background:linear-gradient(180deg,transparent,rgba(22,32,43,.06))}
.visual .stack{position:absolute;left:8%;bottom:10%;display:grid;gap:8px;width:56%}
.visual .bar{height:9px;background:var(--deep);opacity:.82;border-radius:1px}
.visual .bar:nth-child(2){width:82%;opacity:.6}
.visual .bar:nth-child(3){width:64%;opacity:.4}
.visual .tag{position:absolute;top:14px;right:14px;font-family:ui-monospace,monospace;font-size:10px;
  letter-spacing:.14em;color:var(--ink3);border:1px solid var(--line);padding:4px 7px;background:var(--card)}
.visual .dim{position:absolute;left:8%;top:16%;display:flex;align-items:center;gap:8px;color:var(--ink3);
  font:500 10px/1 ui-monospace,monospace}
.visual .dim::before{content:"";width:64px;height:1px;background:var(--ink3);display:block;position:relative}

/* 资质带 */
.certs{border-bottom:1px solid var(--line);background:var(--card)}
.certs .wrap{display:flex;align-items:center;gap:clamp(18px,4vw,52px);padding-block:18px;flex-wrap:wrap}
.certs b{font-size:12.5px;color:var(--ink2);display:flex;align-items:center;gap:8px}
.certs b::before{content:"";width:14px;height:14px;border:1.5px solid var(--accent);border-radius:50%;
  display:block;background:radial-gradient(circle,var(--accent) 30%,transparent 32%)}

/* 产品卡 */
.cat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:clamp(26px,3.6vw,44px)}
@media(max-width:900px){.cat-grid{grid-template-columns:1fr 1fr}}
@media(max-width:580px){.cat-grid{grid-template-columns:1fr}}
.cat{border:1px solid var(--line);background:var(--card);display:flex;flex-direction:column;
  transition:border-color .2s var(--ease)}
.cat:hover{border-color:rgba(22,32,43,.32)}
.cat .thumb{aspect-ratio:16/10;background:
  repeating-linear-gradient(45deg,var(--sunk2) 0 1px,transparent 1px 9px),var(--sunk);
  position:relative;border-bottom:1px solid var(--line2)}
.cat .thumb::after{content:attr(data-code);position:absolute;left:11px;bottom:9px;
  font:500 10px/1 ui-monospace,monospace;letter-spacing:.12em;color:var(--ink3)}
.cat .body{padding:16px 16px 18px;display:grid;gap:9px;flex:1}
.cat .body p{font-size:12.5px;color:var(--ink3);line-height:1.6}
.cat .spec{display:grid;grid-template-columns:auto 1fr;gap:4px 12px;font-size:12px;margin-top:4px}
.cat .spec dt{color:var(--ink3);font-family:ui-monospace,monospace;font-size:11px;letter-spacing:.04em}
.cat .spec dd{margin:0;color:var(--ink2);font-variant-numeric:tabular-nums}
.cat .go{margin-top:auto;font-size:12.5px;color:var(--accent);display:flex;align-items:center;gap:6px}
.cat:hover .go{gap:10px}
.cat .go::after{content:"→";transition:transform .2s}

/* 能力条 */
.cap{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);margin-top:clamp(26px,3.6vw,44px);
  border:1px solid var(--line)}
.cap div{background:var(--card);padding:clamp(18px,2.4vw,26px)}
.cap b{display:block;font-size:clamp(1.3rem,2.2vw,1.7rem);font-weight:620;letter-spacing:-.02em}
.cap span{display:block;font-size:12px;color:var(--ink3);margin-top:5px}
@media(max-width:740px){.cap{grid-template-columns:1fr 1fr}}

/* 信任双栏 */
.trust{display:grid;grid-template-columns:1fr 1fr;gap:clamp(26px,5vw,64px);align-items:start}
@media(max-width:880px){.trust{grid-template-columns:1fr}}
.spec-table{width:100%;border-collapse:collapse;font-size:13px;border:1px solid var(--line);background:var(--card)}
.spec-table th,.spec-table td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--line2)}
.spec-table th{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--ink3);font-weight:500;background:var(--sunk)}
.spec-table tr:last-child td{border-bottom:0}
.spec-table td:first-child{color:var(--ink2)}
.spec-table td:last-child{font-variant-numeric:tabular-nums}

/* 流程 */
.flow-steps{display:grid;grid-template-columns:repeat(5,1fr);gap:0;margin-top:clamp(24px,3.4vw,40px);
  border-top:1px solid var(--line)}
.fs{padding:18px 14px 0 0;border-right:1px solid var(--line2);position:relative}
.fs:last-child{border-right:0}
.fs em{font:500 10px/1 ui-monospace,monospace;color:var(--accent);font-style:normal;letter-spacing:.14em}
.fs h3{margin:10px 0 6px;font-size:13.5px}
.fs p{font-size:12px;color:var(--ink3)}
@media(max-width:880px){.flow-steps{grid-template-columns:1fr 1fr}.fs{border-bottom:1px solid var(--line2);padding-bottom:16px}}

/* 询盘 CTA */
.cta{background:var(--deep);color:#e9eef3;border-block:1px solid rgba(255,255,255,.08)}
.cta .wrap{display:grid;grid-template-columns:1.2fr .8fr;gap:32px;align-items:center;padding-block:clamp(36px,5vw,60px)}
@media(max-width:800px){.cta .wrap{grid-template-columns:1fr}}
.cta h2{color:#fff}
.cta p{color:#a9b6c2;margin-top:12px;font-size:14px}
.cta .actions{display:flex;gap:10px;flex-wrap:wrap;justify-content:flex-end}
@media(max-width:800px){.cta .actions{justify-content:flex-start}}
.cta .btn-g{border-color:rgba(255,255,255,.24);color:#fff}
.cta .btn-g:hover{background:rgba(255,255,255,.08)}

/* 页脚 */
footer{padding-block:clamp(38px,5vw,60px) 26px;font-size:13px}
.foot{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:28px}
@media(max-width:820px){.foot{grid-template-columns:1fr 1fr}}
footer h4{font-size:11px;text-transform:uppercase;letter-spacing:.1em;color:var(--ink3);font-weight:600;margin-bottom:12px}
footer li+li{margin-top:8px}
footer a{color:var(--ink2)}
footer a:hover{color:var(--accent)}
.foot-base{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-top:34px;padding-top:18px;
  border-top:1px solid var(--line);font-size:12px;color:var(--ink3)}

/* 内页 */
.page-head{padding-block:clamp(36px,5vw,64px) clamp(24px,3vw,36px);border-bottom:1px solid var(--line)}
.page-head h1{font-size:clamp(1.7rem,3.6vw,2.7rem)}
.page-head .lede{margin-top:14px}
.breadcrumb{display:flex;gap:8px;font-size:12px;color:var(--ink3);margin-bottom:14px}
.breadcrumb a:hover{color:var(--accent)}

/* 产品目录：左筛选 + 右列表 */
.catalog{display:grid;grid-template-columns:220px 1fr;gap:clamp(20px,3.5vw,44px);padding-block:clamp(28px,4vw,48px)}
@media(max-width:860px){.catalog{grid-template-columns:1fr}}
.filter{position:sticky;top:96px;align-self:start}
.filter h4{font-size:11px;text-transform:uppercase;letter-spacing:.1em;color:var(--ink3);margin-bottom:12px}
.filter ul{display:grid;gap:2px;margin-bottom:22px}
.filter a{display:flex;justify-content:space-between;gap:8px;padding:7px 9px;font-size:13px;color:var(--ink2);
  border-radius:2px;transition:.16s}
.filter a:hover{background:var(--sunk);color:var(--ink)}
.filter a[aria-current]{background:var(--ink);color:var(--paper)}
.filter a span{color:inherit;opacity:.55;font-variant-numeric:tabular-nums;font-size:11.5px}
.p-list{display:grid;gap:12px}
.prow{display:grid;grid-template-columns:150px 1fr auto;gap:18px;align-items:center;padding:14px;
  border:1px solid var(--line);background:var(--card);transition:border-color .18s}
.prow:hover{border-color:rgba(22,32,43,.3)}
.prow .ph{aspect-ratio:4/3;background:repeating-linear-gradient(45deg,var(--sunk2) 0 1px,transparent 1px 8px),var(--sunk);
  border:1px solid var(--line2)}
.prow .info{display:grid;gap:6px;min-width:0}
.prow .info p{font-size:12.5px;color:var(--ink3)}
.prow .kv{display:flex;gap:16px;flex-wrap:wrap;font-size:12px;color:var(--ink2);font-variant-numeric:tabular-nums}
.prow .kv b{color:var(--ink3);font-weight:400;font-family:ui-monospace,monospace;font-size:11px;letter-spacing:.04em}
.prow .side{text-align:right;display:grid;gap:8px;justify-items:end}
@media(max-width:700px){.prow{grid-template-columns:1fr}.prow .ph{aspect-ratio:16/7}.prow .side{justify-items:start;text-align:left}}

/* 表单 */
.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
@media(max-width:640px){.form-grid{grid-template-columns:1fr}}
.field{display:grid;gap:6px}
.field label{font-size:12.5px;color:var(--ink2)}
.field label i{color:var(--accent);font-style:normal}
.field input,.field select,.field textarea{background:var(--card);border:1px solid var(--line);border-radius:2px;
  color:var(--ink);font:inherit;font-size:14px;padding:10px 12px;min-height:42px;transition:border-color .16s,box-shadow .16s}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--accent);
  box-shadow:0 0 0 3px var(--accent-soft)}
.field.full{grid-column:1/-1}
.field .hint{font-size:11.5px;color:var(--ink3)}
.info-box{border:1px solid var(--line);background:var(--card);padding:20px;display:grid;gap:14px}
.info-box .r{display:grid;gap:3px}
.info-box .r b{font-family:ui-monospace,monospace;font-size:14px;font-weight:500;letter-spacing:-.01em}
.info-box .r span{font-size:11.5px;color:var(--ink3)}

:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
@media(prefers-reduced-motion:reduce){*{transition-duration:.01ms!important;animation-duration:.01ms!important}}