/* ==========================================================================
   Replacement Boards — 品牌样式系统
   深石板蓝 + 琥珀橙 | 工业电子 B2B 基调 | 面向欧美维修市场
   ========================================================================== */

:root{
  /* 颜色 */
  --ink:#101a24;
  --ink-2:#1d2c39;
  --ink-3:#2c3e4d;
  --muted:#5c6b7a;
  --muted-2:#8494a3;
  --bg:#ffffff;
  --soft:#f5f8fa;
  --soft-2:#eef3f6;
  --line:#dfe6ec;
  --line-2:#eaeff3;

  --brand:#0e3a5c;
  --brand-2:#16527f;
  --brand-3:#1f6ba5;
  --accent:#f08a24;
  --accent-2:#d9761a;
  --accent-soft:#fdf3e7;
  --ok:#0f8a6a;
  --ok-soft:#e8f6f1;
  --warn:#a5660a;
  --warn-soft:#fdf6e3;
  --danger:#b4342a;
  --danger-soft:#fdecea;

  /* 排版 */
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;

  /* 尺寸 */
  --wrap:1180px;
  --radius:12px;
  --radius-sm:8px;
  --radius-lg:18px;
  --shadow-sm:0 1px 2px rgba(16,26,36,.06),0 1px 3px rgba(16,26,36,.05);
  --shadow:0 4px 14px rgba(16,26,36,.07),0 1px 3px rgba(16,26,36,.05);
  --shadow-lg:0 16px 40px rgba(16,26,36,.12);
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font);
  font-size:16px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
img,svg{max-width:100%;display:block;}
a{color:var(--brand-2);text-decoration:none;}
a:hover{color:var(--accent-2);}
h1,h2,h3,h4{line-height:1.28;letter-spacing:-.015em;margin:0 0 .5em;font-weight:700;color:var(--ink);}
h1{font-size:2.15rem;}
h2{font-size:1.55rem;}
h3{font-size:1.15rem;}
p{margin:0 0 1em;}
ul,ol{padding-left:1.25em;}
li{margin-bottom:.35em;}
code,kbd{font-family:var(--mono);font-size:.87em;background:var(--soft-2);border:1px solid var(--line);border-radius:5px;padding:.1em .38em;}
hr{border:0;border-top:1px solid var(--line);margin:2rem 0;}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px;}
.narrow{max-width:820px;}
.mono{font-family:var(--mono);}
.nowrap{white-space:nowrap;}
.text-muted{color:var(--muted);}
.center{text-align:center;}

/* ---------- 顶部信息条 ---------- */
.topbar{
  background:var(--ink);
  color:#b9c6d2;
  font-size:12.8px;
  letter-spacing:.01em;
}
.topbar .wrap{
  display:flex;align-items:center;justify-content:space-between;
  gap:16px;min-height:38px;flex-wrap:wrap;
}
.topbar ul{display:flex;gap:18px;list-style:none;margin:0;padding:0;flex-wrap:wrap;}
.topbar li{display:flex;align-items:center;gap:6px;margin:0;}
.topbar svg{width:14px;height:14px;flex:0 0 auto;stroke:var(--accent);}
.topbar a{color:#dce6ef;}
.topbar a:hover{color:#fff;}

/* ---------- 站点头部 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(255,255,255,.94);
  backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--line);
}
.site-header .wrap{
  display:flex;align-items:center;gap:26px;
  min-height:70px;
}
.logo{display:flex;align-items:center;gap:11px;flex:0 0 auto;color:var(--ink);}
.logo:hover{color:var(--ink);}
.logo-mark{width:38px;height:38px;flex:0 0 auto;}
.logo-text{display:flex;flex-direction:column;line-height:1.1;}
.logo-text b{font-size:16.5px;letter-spacing:-.02em;}
.logo-text span{font-size:10.5px;letter-spacing:.13em;text-transform:uppercase;color:var(--muted-2);font-weight:600;}

.main-nav{display:flex;gap:4px;margin-left:auto;flex-wrap:wrap;}
.main-nav a{
  color:var(--ink-2);font-size:14.5px;font-weight:500;
  padding:9px 12px;border-radius:8px;transition:background .15s,color .15s;
}
.main-nav a:hover{background:var(--soft-2);color:var(--brand);}
.main-nav a[aria-current="page"]{color:var(--brand);background:var(--soft-2);font-weight:600;}

.header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto;}

/* 语言切换 */
.lang-switch{position:relative;}
.lang-switch > summary{
  list-style:none;cursor:pointer;display:flex;align-items:center;gap:6px;
  border:1px solid var(--line);border-radius:8px;padding:8px 11px;
  font-size:13.5px;font-weight:600;color:var(--ink-2);background:#fff;
}
.lang-switch > summary::-webkit-details-marker{display:none;}
.lang-switch > summary:hover{border-color:var(--brand-3);color:var(--brand);}
.lang-switch ul{
  position:absolute;right:0;top:calc(100% + 6px);min-width:180px;
  background:#fff;border:1px solid var(--line);border-radius:10px;
  box-shadow:var(--shadow-lg);list-style:none;margin:0;padding:6px;z-index:70;
}
.lang-switch li{margin:0;}
.lang-switch ul a{display:block;padding:8px 11px;border-radius:7px;font-size:14px;color:var(--ink-2);}
.lang-switch ul a:hover{background:var(--soft-2);}
.lang-switch ul a[aria-current="true"]{color:var(--accent-2);font-weight:600;background:var(--accent-soft);}

/* 移动端菜单 */
.nav-toggle{display:none;background:#fff;border:1px solid var(--line);border-radius:8px;padding:9px 10px;cursor:pointer;}
.nav-toggle svg{width:18px;height:18px;stroke:var(--ink-2);}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border-radius:9px;border:1px solid transparent;
  font-size:14.8px;font-weight:600;cursor:pointer;font-family:inherit;
  transition:transform .12s,background .15s,border-color .15s,color .15s,box-shadow .15s;
  text-align:center;line-height:1.35;
}
.btn svg{width:16px;height:16px;flex:0 0 auto;}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 2px 0 var(--accent-2);}
.btn-primary:hover{background:var(--accent-2);color:#fff;transform:translateY(-1px);}
.btn-brand{background:var(--brand);color:#fff;}
.btn-brand:hover{background:var(--brand-2);color:#fff;transform:translateY(-1px);}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--ink-2);}
.btn-ghost:hover{border-color:var(--brand-3);color:var(--brand);background:#fff;}
.btn-light{background:rgba(255,255,255,.12);border-color:rgba(255,255,255,.3);color:#fff;}
.btn-light:hover{background:rgba(255,255,255,.2);color:#fff;}
.btn-sm{padding:8px 14px;font-size:13.5px;}
.btn-lg{padding:14px 28px;font-size:16px;}
.btn-block{width:100%;}

/* ---------- Hero ---------- */
.hero{
  position:relative;overflow:hidden;
  background:
    radial-gradient(900px 420px at 82% -10%,rgba(31,107,165,.42),transparent 62%),
    radial-gradient(620px 340px at 8% 108%,rgba(240,138,36,.22),transparent 66%),
    linear-gradient(150deg,#0c2336 0%,var(--brand) 52%,#12456b 100%);
  color:#fff;
}
.hero::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
  background-image:linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);
  background-size:44px 44px;
  mask-image:radial-gradient(700px 480px at 30% 40%,#000,transparent 78%);
}
.hero .wrap{position:relative;z-index:2;padding-top:62px;padding-bottom:60px;}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center;}
.hero h1{color:#fff;font-size:2.5rem;letter-spacing:-.025em;margin-bottom:16px;}
.hero .lead{color:#c3d5e4;font-size:16.8px;max-width:620px;margin-bottom:26px;}
.kicker{
  display:inline-flex;align-items:center;gap:8px;
  font-size:11.8px;letter-spacing:.15em;text-transform:uppercase;font-weight:700;
  color:#ffd7ab;border:1px solid rgba(240,138,36,.5);background:rgba(240,138,36,.13);
  border-radius:999px;padding:5px 14px;margin-bottom:18px;
}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:26px;}
.hero-stats{display:flex;gap:34px;flex-wrap:wrap;padding-top:22px;border-top:1px solid rgba(255,255,255,.16);}
.hero-stat b{display:block;font-size:1.6rem;font-weight:700;color:#fff;letter-spacing:-.02em;}
.hero-stat span{font-size:12.6px;color:#a8bccf;}

/* Hero 侧边卡片 */
.hero-card{
  background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.16);
  border-radius:var(--radius-lg);padding:24px;backdrop-filter:blur(6px);
}
.hero-card h3{color:#fff;font-size:1.02rem;margin-bottom:14px;display:flex;align-items:center;gap:8px;}
.hero-card h3 svg{width:17px;height:17px;stroke:var(--accent);}
.hero-card ul{list-style:none;padding:0;margin:0;}
.hero-card li{
  display:flex;gap:10px;align-items:flex-start;
  font-size:14px;color:#cfe0ee;padding:9px 0;border-bottom:1px solid rgba(255,255,255,.09);
}
.hero-card li:last-child{border-bottom:0;}
.hero-card li svg{width:15px;height:15px;flex:0 0 auto;margin-top:3px;stroke:#5fd3a8;}
.hero-card .price{color:#ffd7ab;font-weight:700;font-family:var(--mono);}

/* ---------- 区块 ---------- */
.section{padding:64px 0;}
.section.tight{padding:44px 0;}
.section.soft{background:var(--soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.section-head{max-width:740px;margin-bottom:36px;}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center;}
.section-head h2{font-size:1.72rem;margin-bottom:12px;}
.section-head p{color:var(--muted);font-size:16.2px;margin:0;}
.eyebrow{
  display:block;font-size:11.8px;letter-spacing:.15em;text-transform:uppercase;
  font-weight:700;color:var(--accent-2);margin-bottom:10px;
}

/* ---------- 面包屑 ---------- */
.crumbs{font-size:13.4px;color:var(--muted);padding:18px 0 0;}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:7px;margin:0;padding:0;align-items:center;}
.crumbs li{margin:0;display:flex;align-items:center;gap:7px;}
.crumbs li+li::before{content:"/";color:var(--muted-2);}
.crumbs a{color:var(--muted);}
.crumbs a:hover{color:var(--accent-2);}

/* ---------- 卡片与网格 ---------- */
.grid{display:grid;gap:22px;}
.grid-2{grid-template-columns:repeat(2,1fr);}
.grid-3{grid-template-columns:repeat(3,1fr);}
.grid-4{grid-template-columns:repeat(4,1fr);}
.grid-sidebar{grid-template-columns:1fr 340px;gap:40px;align-items:start;}

.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:24px;transition:border-color .16s,box-shadow .16s,transform .16s;
}
.card.pad-lg{padding:30px;}
.card.hoverable:hover{border-color:var(--brand-3);box-shadow:var(--shadow);transform:translateY(-2px);}
.card h3{margin-bottom:8px;font-size:1.08rem;}
.card p{color:var(--muted);font-size:14.8px;margin-bottom:0;}
.card .icon{
  width:42px;height:42px;border-radius:11px;background:var(--accent-soft);
  display:flex;align-items:center;justify-content:center;margin-bottom:14px;
}
.card .icon svg{width:21px;height:21px;stroke:var(--accent-2);}
.card.brand .icon{background:rgba(14,58,92,.07);}
.card.brand .icon svg{stroke:var(--brand-2);}

/* ---------- 产品卡 ---------- */
.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.product-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;display:flex;flex-direction:column;
  transition:border-color .16s,box-shadow .16s,transform .16s;
}
.product-card:hover{border-color:var(--brand-3);box-shadow:var(--shadow);transform:translateY(-3px);}
.product-thumb{
  background:linear-gradient(160deg,#123a5a,#0d2a42);
  aspect-ratio:16/10;display:flex;align-items:center;justify-content:center;
  position:relative;overflow:hidden;
}
.product-thumb svg{width:62%;height:auto;opacity:.92;}
.product-thumb .tag{
  position:absolute;top:12px;left:12px;
  font-size:11px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;
  background:var(--accent);color:#fff;border-radius:5px;padding:3px 8px;
}
.product-body{padding:18px 20px 20px;display:flex;flex-direction:column;flex:1;}
.product-brand{font-size:11.6px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted-2);font-weight:700;margin-bottom:6px;}
.product-body h3{font-size:1rem;margin-bottom:8px;}
.product-body h3 a{color:var(--ink);}
.product-body h3 a:hover{color:var(--accent-2);}
.product-oem{font-family:var(--mono);font-size:12.4px;color:var(--muted);margin-bottom:10px;}
.compat{display:flex;flex-wrap:wrap;gap:5px;margin-bottom:14px;}
.compat span{font-size:11.6px;background:var(--soft-2);border:1px solid var(--line);border-radius:5px;padding:2px 7px;color:var(--ink-3);}
.product-foot{margin-top:auto;padding-top:14px;border-top:1px solid var(--line-2);display:flex;align-items:center;justify-content:space-between;gap:12px;}
.price{font-family:var(--mono);font-weight:700;color:var(--ink);font-size:1.06rem;}
.price .from{font-family:var(--font);font-weight:500;font-size:11.5px;color:var(--muted-2);display:block;letter-spacing:.04em;}
.stock{font-size:12.4px;font-weight:600;display:inline-flex;align-items:center;gap:5px;}
.stock.in{color:var(--ok);}
.stock.low{color:var(--warn);}
.stock::before{content:"";width:7px;height:7px;border-radius:50%;background:currentColor;display:inline-block;}

/* ---------- 徽章 ---------- */
.badge{
  display:inline-flex;align-items:center;gap:5px;
  font-size:11.8px;font-weight:700;letter-spacing:.03em;
  border-radius:999px;padding:3px 10px;border:1px solid transparent;
}
.badge-ok{background:var(--ok-soft);color:var(--ok);border-color:rgba(15,138,106,.22);}
.badge-warn{background:var(--warn-soft);color:var(--warn);border-color:rgba(165,102,10,.22);}
.badge-danger{background:var(--danger-soft);color:var(--danger);border-color:rgba(180,52,42,.2);}
.badge-brand{background:rgba(14,58,92,.07);color:var(--brand-2);border-color:rgba(14,58,92,.16);}
.badge-muted{background:var(--soft-2);color:var(--muted);border-color:var(--line);}

/* ---------- 表格 ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:#fff;}
table.data{width:100%;border-collapse:collapse;font-size:14.4px;min-width:560px;}
table.data thead th{
  background:var(--soft);text-align:left;padding:13px 16px;
  font-size:12.4px;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-3);
  font-weight:700;border-bottom:1px solid var(--line);white-space:nowrap;
}
table.data td{padding:13px 16px;border-bottom:1px solid var(--line-2);vertical-align:top;}
table.data tbody tr:last-child td{border-bottom:0;}
table.data tbody tr:hover{background:var(--soft);}
table.data td.mono,table.data th.mono{font-family:var(--mono);font-size:13.4px;}
.tier-1{color:var(--ok);font-weight:700;}
.tier-2{color:var(--brand-2);font-weight:700;}
.tier-3{color:var(--warn);font-weight:700;}
.tier-4{color:var(--muted);font-weight:700;}

/* ---------- 型号匹配工具 ---------- */
.matcher{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);
  box-shadow:var(--shadow);overflow:hidden;
}
.matcher-head{
  background:linear-gradient(140deg,#0d2f4b,var(--brand-2));color:#fff;padding:24px 26px;
}
.matcher-head h3{color:#fff;margin-bottom:5px;font-size:1.16rem;}
.matcher-head p{color:#b9cfe1;font-size:14px;margin:0;}
.matcher-body{padding:26px;}
.field{margin-bottom:18px;}
.field label{display:block;font-size:13.6px;font-weight:600;color:var(--ink-2);margin-bottom:7px;}
.field .hint{font-size:12.4px;color:var(--muted-2);font-weight:400;margin-left:6px;}
.input,select.input,textarea.input{
  width:100%;padding:11px 14px;border:1px solid var(--line);border-radius:9px;
  font-size:15px;font-family:inherit;color:var(--ink);background:#fff;
  transition:border-color .15s,box-shadow .15s;
}
.input:focus{outline:0;border-color:var(--brand-3);box-shadow:0 0 0 3px rgba(31,107,165,.13);}
textarea.input{min-height:130px;resize:vertical;}
select.input{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%235c6b7a' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;background-size:16px;padding-right:38px;}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;}

.matcher-result{margin-top:22px;}
.result-card{
  border:1px solid var(--ok);background:var(--ok-soft);border-radius:var(--radius);
  padding:20px 22px;display:flex;gap:18px;align-items:flex-start;
}
.result-card.no{border-color:var(--warn);background:var(--warn-soft);}
.result-card .rc-icon{width:40px;height:40px;border-radius:10px;background:#fff;display:flex;align-items:center;justify-content:center;flex:0 0 auto;}
.result-card .rc-icon svg{width:21px;height:21px;stroke:var(--ok);}
.result-card.no .rc-icon svg{stroke:var(--warn);}
.result-card h4{margin-bottom:6px;font-size:1.05rem;}
.result-card p{font-size:14.4px;color:var(--ink-2);margin-bottom:10px;}
.result-card .actions{display:flex;gap:10px;flex-wrap:wrap;}

.chip-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px;}
.chip{
  font-size:13.2px;border:1px solid var(--line);background:#fff;border-radius:999px;
  padding:6px 13px;cursor:pointer;color:var(--ink-2);font-family:inherit;
  transition:border-color .14s,color .14s,background .14s;
}
.chip:hover{border-color:var(--accent);color:var(--accent-2);background:var(--accent-soft);}
.chip.active{background:var(--brand);border-color:var(--brand);color:#fff;}

/* ---------- 兼容性清单 ---------- */
.compat-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:10px;list-style:none;padding:0;margin:0;}
.compat-list li{
  display:flex;align-items:center;gap:9px;font-size:14.2px;
  background:var(--soft);border:1px solid var(--line-2);border-radius:9px;padding:10px 13px;margin:0;
}
.compat-list li svg{width:15px;height:15px;stroke:var(--ok);flex:0 0 auto;}

/* ---------- FAQ ---------- */
.faq details{
  border:1px solid var(--line);border-radius:var(--radius);background:#fff;
  margin-bottom:10px;overflow:hidden;
}
.faq summary{
  cursor:pointer;list-style:none;padding:16px 20px;font-weight:600;font-size:15.4px;
  display:flex;justify-content:space-between;align-items:center;gap:14px;color:var(--ink);
}
.faq summary::-webkit-details-marker{display:none;}
.faq summary::after{content:"+";font-size:20px;color:var(--accent);font-weight:400;line-height:1;flex:0 0 auto;}
.faq details[open] summary::after{content:"−";}
.faq details[open] summary{border-bottom:1px solid var(--line-2);background:var(--soft);}
.faq .faq-body{padding:16px 20px 18px;font-size:14.8px;color:var(--ink-2);}
.faq .faq-body p:last-child{margin-bottom:0;}

/* ---------- 内容排版（指南/文章） ---------- */
.prose{font-size:16.4px;color:var(--ink-2);}
.prose h2{margin-top:2.2rem;padding-top:.4rem;font-size:1.4rem;}
.prose h3{margin-top:1.7rem;font-size:1.12rem;color:var(--ink);}
.prose ul,.prose ol{margin-bottom:1.2em;}
.prose li{margin-bottom:.45em;}
.prose strong{color:var(--ink);font-weight:650;}
.prose blockquote{
  margin:1.4rem 0;padding:14px 20px;border-left:3px solid var(--accent);
  background:var(--accent-soft);border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  font-size:15.4px;color:var(--ink-2);
}
.prose blockquote p:last-child{margin-bottom:0;}
.prose img{border-radius:var(--radius);border:1px solid var(--line);margin:1.4rem 0;}

.callout{
  border:1px solid var(--line);border-left:3px solid var(--brand-3);
  background:var(--soft);border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  padding:16px 20px;margin:1.4rem 0;font-size:15.2px;
}
.callout.warn{border-left-color:var(--accent);background:var(--accent-soft);}
.callout.danger{border-left-color:var(--danger);background:var(--danger-soft);}
.callout.ok{border-left-color:var(--ok);background:var(--ok-soft);}
.callout h4{margin:0 0 7px;font-size:14.6px;display:flex;align-items:center;gap:8px;}
.callout h4 svg{width:16px;height:16px;flex:0 0 auto;}
.callout p:last-child,.callout ul:last-child{margin-bottom:0;}

/* 规格表 */
.spec-table{width:100%;border-collapse:collapse;font-size:14.6px;}
.spec-table th{
  text-align:left;width:38%;padding:11px 0;color:var(--muted);
  font-weight:500;vertical-align:top;border-bottom:1px solid var(--line-2);
}
.spec-table td{padding:11px 0;border-bottom:1px solid var(--line-2);color:var(--ink-2);}
.spec-table tr:last-child th,.spec-table tr:last-child td{border-bottom:0;}

/* ---------- 侧栏 ---------- */
.sidebar{position:sticky;top:90px;display:flex;flex-direction:column;gap:18px;}
.side-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;}
.side-card h4{font-size:1rem;margin-bottom:12px;display:flex;align-items:center;gap:8px;}
.side-card h4 svg{width:17px;height:17px;stroke:var(--accent-2);}
.side-card .price-lg{font-family:var(--mono);font-size:1.65rem;font-weight:700;margin-bottom:4px;}
.side-card .price-note{font-size:12.8px;color:var(--muted);margin-bottom:16px;}
.side-card ul.plain{list-style:none;padding:0;margin:0;font-size:14.2px;}
.side-card ul.plain li{display:flex;gap:9px;padding:7px 0;border-bottom:1px solid var(--line-2);color:var(--ink-2);}
.side-card ul.plain li:last-child{border-bottom:0;}
.side-card ul.plain svg{width:15px;height:15px;stroke:var(--ok);flex:0 0 auto;margin-top:4px;}

/* ---------- 流程步骤 ---------- */
.steps{counter-reset:step;display:grid;gap:0;}
.step{
  display:grid;grid-template-columns:46px 1fr;gap:20px;
  padding:22px 0;border-bottom:1px solid var(--line-2);
}
.step:last-child{border-bottom:0;}
.step::before{
  counter-increment:step;content:counter(step,decimal-leading-zero);
  font-family:var(--mono);font-size:14px;font-weight:700;color:var(--accent-2);
  background:var(--accent-soft);border:1px solid rgba(240,138,36,.28);
  width:46px;height:46px;border-radius:12px;display:flex;align-items:center;justify-content:center;
}
.step h4{margin-bottom:6px;font-size:1.04rem;}
.step p{color:var(--muted);font-size:14.8px;margin-bottom:0;}
.step .step-meta{font-size:12.8px;color:var(--muted-2);margin-top:8px;display:flex;gap:14px;flex-wrap:wrap;}

/* ---------- B2B 价格表 ---------- */
.tier-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.tier-card{
  border:1px solid var(--line);border-radius:var(--radius);padding:26px;background:#fff;
  display:flex;flex-direction:column;position:relative;
}
.tier-card.featured{border-color:var(--brand-3);box-shadow:var(--shadow);}
.tier-card.featured::before{
  content:"MOST POPULAR";position:absolute;top:-11px;left:50%;transform:translateX(-50%);
  background:var(--brand);color:#fff;font-size:10.5px;font-weight:700;letter-spacing:.1em;
  padding:4px 12px;border-radius:999px;
}
.tier-card h3{font-size:1.06rem;margin-bottom:4px;}
.tier-card .tier-qty{font-size:13.4px;color:var(--muted);margin-bottom:16px;}
.tier-card .tier-price{font-family:var(--mono);font-size:2rem;font-weight:700;color:var(--brand);line-height:1;}
.tier-card .tier-price small{font-size:.8rem;font-weight:500;color:var(--muted);font-family:var(--font);}
.tier-card ul{list-style:none;padding:0;margin:20px 0 22px;font-size:14.4px;flex:1;}
.tier-card ul li{display:flex;gap:9px;padding:6px 0;color:var(--ink-2);}
.tier-card ul li svg{width:15px;height:15px;stroke:var(--ok);flex:0 0 auto;margin-top:4px;}

/* ---------- 表单 ---------- */
.form-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:32px;box-shadow:var(--shadow-sm);}
.form-note{font-size:13.2px;color:var(--muted);margin-top:14px;}
.form-note a{text-decoration:underline;}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--ink);color:#93a4b4;font-size:14px;margin-top:0;}
.site-footer .wrap{padding-top:52px;padding-bottom:32px;}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:38px;padding-bottom:34px;border-bottom:1px solid rgba(255,255,255,.1);}
.site-footer h4{color:#fff;font-size:13.2px;letter-spacing:.08em;text-transform:uppercase;margin-bottom:14px;}
.site-footer ul{list-style:none;padding:0;margin:0;}
.site-footer li{margin-bottom:9px;}
.site-footer a{color:#93a4b4;}
.site-footer a:hover{color:#fff;}
.footer-logo{display:flex;align-items:center;gap:11px;margin-bottom:14px;}
.footer-logo b{color:#fff;font-size:16px;}
.footer-about{font-size:13.6px;line-height:1.7;color:#8395a5;max-width:330px;}
.footer-compliance{display:flex;flex-wrap:wrap;gap:9px;margin-top:18px;}
.footer-compliance span{
  font-size:11.6px;border:1px solid rgba(255,255,255,.16);border-radius:6px;
  padding:4px 9px;color:#9db0c1;
}
.footer-bottom{padding-top:24px;display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap;font-size:12.8px;color:#7a8b9a;}

/* ---------- 通用工具类 ---------- */
.mb-0{margin-bottom:0!important;}
.mb-1{margin-bottom:8px!important;}
.mb-2{margin-bottom:16px!important;}
.mb-3{margin-bottom:24px!important;}
.mt-2{margin-top:16px!important;}
.mt-3{margin-top:24px!important;}
.flex{display:flex;}
.flex-wrap{flex-wrap:wrap;}
.gap-2{gap:16px;}
.items-center{align-items:center;}
.between{justify-content:space-between;}
.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;}

/* ---------- 响应式 ---------- */
@media (max-width:1040px){
  .hero-grid{grid-template-columns:1fr;gap:34px;}
  .grid-sidebar{grid-template-columns:1fr;gap:30px;}
  .sidebar{position:static;}
  .product-grid,.grid-3,.grid-4,.tier-cards{grid-template-columns:repeat(2,1fr);}
  .footer-grid{grid-template-columns:1fr 1fr;gap:30px;}
}
@media (max-width:820px){
  .nav-toggle{display:flex;}
  .main-nav{
    position:absolute;left:0;right:0;top:100%;
    flex-direction:column;background:#fff;border-bottom:1px solid var(--line);
    padding:12px 24px 18px;gap:2px;display:none;box-shadow:var(--shadow);
  }
  .main-nav.open{display:flex;}
  .main-nav a{padding:11px 12px;font-size:15.4px;}
  .site-header .wrap{position:relative;min-height:64px;}
  .header-actions .btn{display:none;}
  .hero h1{font-size:2rem;}
  .hero .wrap{padding-top:44px;padding-bottom:44px;}
  .section{padding:48px 0;}
  .grid-2,.product-grid,.grid-3,.grid-4,.tier-cards{grid-template-columns:1fr;}
  .field-row{grid-template-columns:1fr;}
}
@media (max-width:560px){
  body{font-size:15.4px;}
  .wrap{padding:0 18px;}
  h1{font-size:1.72rem;}
  .hero h1{font-size:1.68rem;}
  .section-head h2{font-size:1.42rem;}
  .hero-stats{gap:22px;}
  .hero-stat b{font-size:1.35rem;}
  .card.pad-lg,.form-card{padding:22px;}
  .footer-grid{grid-template-columns:1fr;}
  .step{grid-template-columns:38px 1fr;gap:15px;}
  .step::before{width:38px;height:38px;font-size:12.5px;}
}

/* ---------- 打印 ---------- */
@media print{
  .site-header,.topbar,.site-footer,.hero-cta,.matcher{display:none;}
  body{font-size:11pt;}
  .card,.section{break-inside:avoid;}
}

/* ---------- 深色主题适配（预览面板/OS 偏好） ---------- */
@media (prefers-color-scheme:dark){
  :root{
    --ink:#eaf1f7;
    --ink-2:#c6d3de;
    --ink-3:#a7b7c4;
    --muted:#93a4b3;
    --muted-2:#76889a;
    --bg:#0d1620;
    --soft:#131f2b;
    --soft-2:#182634;
    --line:#22323f;
    --line-2:#1c2b38;
    --brand:#8fb9dd;
    --brand-2:#a8cbe8;
    --brand-3:#6ea6d4;
    --accent-soft:#2a2013;
    --ok-soft:#10241e;
    --warn-soft:#2a2312;
    --danger-soft:#2c1614;
    --shadow-sm:0 1px 2px rgba(0,0,0,.4);
    --shadow:0 4px 14px rgba(0,0,0,.45);
    --shadow-lg:0 16px 40px rgba(0,0,0,.55);
  }
  .site-header{background:rgba(13,22,32,.94);}
  .card,.product-card,.matcher,.side-card,.tier-card,.form-card,.table-wrap,.faq details{background:#111d28;}
  .product-thumb{background:linear-gradient(160deg,#16324a,#0c1e2e);}
  .input,select.input,textarea.input,.chip,.btn-ghost,.lang-switch>summary,.nav-toggle{background:#111d28;color:var(--ink);}
  .main-nav{background:#0d1620;}
  .lang-switch ul{background:#111d28;}
  code,kbd{background:#182634;}
  .topbar,.site-footer{background:#08111a;}
}