/* ===== 代加工·汽车新能源代工 · 高端科技风 ===== */
:root{
  --bg:#0a0e17;
  --bg-soft:#0f1623;
  --panel:#121b2b;
  --panel-2:#162133;
  --line:#22304a;
  --txt:#e6edf6;
  --txt-dim:#9fb0c7;
  --txt-mute:#6b7d97;
  --brand:#2fe6c4;
  --brand-2:#3aa0ff;
  --accent:#ff8a3a;
  --h2-inset:0px;          /* 面包屑与 H2 左缘对齐控制 */
  --maxw:1200px;
  --main-w:760px;
  --toc-w:240px;
  --radius:14px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:
    radial-gradient(1200px 600px at 80% -10%, rgba(58,160,255,.12), transparent 60%),
    radial-gradient(900px 500px at -10% 10%, rgba(47,230,196,.10), transparent 55%),
    var(--bg);
  color:var(--txt);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  line-height:1.75;font-size:16px;
}
a{color:var(--brand-2);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
code{background:var(--panel-2);padding:2px 6px;border-radius:6px;font-size:.9em;color:#bfe9ff}
pre{background:var(--panel-2);padding:14px 16px;border-radius:10px;overflow:auto;border:1px solid var(--line)}
pre code{padding:0;background:none}
blockquote{
  margin:18px 0;padding:12px 16px;border-left:3px solid var(--brand);
  background:linear-gradient(90deg,rgba(47,230,196,.08),transparent);
  border-radius:0 8px 8px 0;color:var(--txt-dim)
}
table.data{border-collapse:collapse;width:100%;margin:20px 0;font-size:14.5px;background:var(--panel)}
table.data th,table.data td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
table.data th{background:var(--panel-2);color:var(--txt);font-weight:600}
table.data tr:nth-child(even) td{background:rgba(255,255,255,.02)}

/* ===== 顶部导航 ===== */
.site-header{position:fixed;top:0;left:0;right:0;z-index:50;
  background:rgba(10,14,23,.82);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line)}
.nav-inner{max-width:var(--maxw);margin:0 auto;display:flex;align-items:center;gap:22px;
  padding:0 20px;height:62px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--txt);font-size:17px;white-space:nowrap}
.brand .logo{width:30px;height:30px;border-radius:8px;background:linear-gradient(135deg,var(--brand),var(--brand-2));display:inline-block}
.nav-links{display:flex;gap:6px;margin-left:auto;align-items:center}
.nav-links>li{position:relative;list-style:none}
.nav-links>li>a{padding:9px 13px;border-radius:8px;color:var(--txt-dim);font-size:14.5px;display:block}
.nav-links>li>a:hover{color:var(--txt);background:var(--panel);text-decoration:none}
.nav-links .has-sub>.sub{display:none;position:absolute;top:100%;left:0;min-width:200px;
  background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:6px;margin-top:6px;
  box-shadow:0 12px 30px rgba(0,0,0,.4)}
.nav-links .has-sub:hover>.sub{display:block}
.nav-links .sub a{display:block;padding:8px 12px;border-radius:7px;color:var(--txt-dim);font-size:14px}
.nav-links .sub a:hover{background:var(--panel-2);color:var(--txt)}
.nav-toggle{display:none;margin-left:auto;background:none;border:1px solid var(--line);color:var(--txt);
  border-radius:8px;padding:8px 12px;font-size:18px;cursor:pointer}

/* ===== 容器 / 布局 ===== */
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}
main{padding-top:90px}
.layout-body{display:grid;grid-template-columns:minmax(0,var(--main-w)) var(--toc-w);
  gap:32px;justify-content:center;padding:18px 0 60px}
.breadcrumb{grid-column:1 / 2;grid-row:1;margin:0 0 14px;font-size:13.5px;color:var(--txt-mute);padding-left:var(--h2-inset)}
.breadcrumb a{color:var(--txt-dim)}
.breadcrumb .sep{margin:0 8px;color:var(--txt-mute)}
.breadcrumb .cur{color:var(--txt)}
.article-main{grid-column:1;grid-row:2;min-width:0}
.toc-aside{grid-column:2;grid-row:2;position:sticky;top:82px;max-height:calc(100vh - 100px);overflow:auto}
.toc-aside .toc-title{font-size:13px;color:var(--txt-mute);text-transform:uppercase;letter-spacing:.08em;margin-bottom:10px}
.toc-aside ul{list-style:none;margin:0;padding:0;border-left:2px solid var(--line)}
.toc-aside li a{display:block;padding:6px 12px;color:var(--txt-dim);font-size:13.5px;border-left:2px solid transparent;margin-left:-2px}
.toc-aside li a:hover,.toc-aside li a.active{color:var(--brand);border-left-color:var(--brand);text-decoration:none}
.toc-aside li.lv3 a{padding-left:24px;font-size:13px}

/* ===== 正文排版 ===== */
h1{font-size:30px;line-height:1.3;margin:0 0 18px;letter-spacing:-.01em}
.article-main h2{font-size:22px;margin:34px 0 12px;padding-top:6px;border-top:1px solid var(--line)}
.article-main h3{font-size:18px;margin:24px 0 10px;color:var(--txt)}
.article-main p{margin:12px 0;color:#d6e0ee}
.article-main ul,.article-main ol{padding-left:22px;color:#d6e0ee}
.article-main li{margin:6px 0}
.tag-row{margin:6px 0 18px;display:flex;flex-wrap:wrap;gap:8px}
.tag-text{display:inline-block;background:var(--panel-2);border:1px solid var(--line);color:var(--txt-dim);
  font-size:12.5px;padding:3px 10px;border-radius:999px}
.update-time{font-size:13px;color:var(--txt-mute);margin:2px 0 18px}
.byline{font-size:13px;color:var(--txt-mute);margin:-10px 0 18px}
.byline a{color:var(--brand-2)}
.abstract{background:linear-gradient(135deg,rgba(58,160,255,.10),rgba(47,230,196,.08));
  border:1px solid var(--line);border-radius:12px;padding:16px 18px;margin:0 0 22px;color:#dbe7f5}
.abstract b{color:var(--brand)}
.case-box{background:rgba(255,193,84,.08);border:1px solid rgba(255,193,84,.35);border-radius:12px;
  padding:14px 16px;margin:22px 0;color:#f0e2c0}
.case-box .label{font-weight:700;color:#ffc154;margin-bottom:6px;font-size:14px}

/* ===== FAQ ===== */
.faq-block{margin:30px 0}
.faq-block h2{font-size:22px;margin:0 0 14px}
.faq-block details{border:1px solid var(--line);border-radius:10px;margin:10px 0;background:var(--panel);overflow:hidden}
.faq-block summary{padding:13px 16px;cursor:pointer;font-weight:600;color:var(--txt);list-style:none}
.faq-block summary::-webkit-details-marker{display:none}
.faq-block summary::before{content:"+";color:var(--brand);margin-right:10px;font-weight:700}
.faq-block details[open] summary::before{content:"−"}
.faq-block details[open] summary{border-bottom:1px solid var(--line)}
.faq-block .faq-a{padding:12px 16px;color:#d6e0ee}

/* ===== 产品参数 ===== */
.spec-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:18px 0}
.spec-card{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:12px 14px}
.spec-card .k{font-size:12.5px;color:var(--txt-mute)}
.spec-card .v{font-size:15px;color:var(--txt);font-weight:600;margin-top:3px}
.related-list{list-style:none;padding:0;margin:14px 0}
.related-list li{padding:10px 14px;background:var(--panel);border:1px solid var(--line);border-radius:10px;margin:8px 0}

/* ===== 列表页分类 ===== */
.list-layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:28px;padding:18px 0 60px}
.cat-side .cat-title{font-size:13px;color:var(--txt-mute);margin:0 0 10px;text-transform:uppercase;letter-spacing:.08em}
ul.category-list{list-style:none;margin:0;padding:0}
ul.category-list li a{display:block;padding:10px 14px;border-radius:9px;color:var(--txt-dim);border:1px solid transparent}
ul.category-list li a:hover,ul.category-list li a.active{background:var(--panel);border-color:var(--line);color:var(--txt);text-decoration:none}
.cat-content h1{margin:0 0 6px}
.cat-content .cat-desc{color:var(--txt-dim);margin:0 0 20px}
.item-card{display:block;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:18px 20px;margin:14px 0;transition:.2s}
.item-card:hover{border-color:var(--brand);transform:translateY(-2px);text-decoration:none}
.item-card h3{margin:0 0 8px;color:var(--txt);font-size:18px}
.item-card p{margin:0;color:var(--txt-dim);font-size:14px}
.item-card .meta{margin-top:10px;font-size:12.5px;color:var(--txt-mute)}

/* ===== 首页 ===== */
.hero{padding:80px 0 50px;text-align:left}
.hero h1{font-size:42px;line-height:1.2;margin:0 0 16px;background:linear-gradient(120deg,#fff,var(--brand));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{font-size:18px;color:var(--txt-dim);max-width:680px}
.hero .cta{margin-top:26px;display:flex;gap:14px;flex-wrap:wrap}
.btn{padding:12px 22px;border-radius:10px;font-weight:600;display:inline-block;cursor:pointer;border:1px solid var(--line)}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#04121a;border:none}
.btn-ghost{background:transparent;color:var(--txt)}
.section{padding:46px 0}
.section h2{font-size:26px;margin:0 0 6px}
.section .sub{color:var(--txt-dim);margin:0 0 24px}
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px}
.feature-card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:22px;transition:.2s}
.feature-card:hover{border-color:var(--brand)}
.feature-card h3{margin:0 0 8px;font-size:18px}
.feature-card p{margin:0;color:var(--txt-dim);font-size:14px}
.stat-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:16px;margin-top:26px}
.stat{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:18px;text-align:center}
.stat .num{font-size:28px;font-weight:800;color:var(--brand)}
.stat .lab{font-size:13px;color:var(--txt-dim);margin-top:4px}
.pill-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
.pill{background:var(--panel-2);border:1px solid var(--line);padding:8px 14px;border-radius:999px;color:var(--txt-dim);font-size:14px}

/* ===== 页脚 ===== */
.site-footer{border-top:1px solid var(--line);background:var(--bg-soft);padding:36px 0 28px;margin-top:40px}
.footer-inner{max-width:var(--maxw);margin:0 auto;padding:0 20px;display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:30px}
.footer-inner h4{font-size:14px;color:var(--txt);margin:0 0 12px}
.footer-inner a,.footer-inner p{color:var(--txt-dim);font-size:13.5px;display:block;margin:6px 0}
.footer-bottom{max-width:var(--maxw);margin:24px auto 0;padding:16px 20px 0;border-top:1px solid var(--line);color:var(--txt-mute);font-size:12.5px}

/* ===== 悬浮胶囊 ===== */
.float-capsule{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:60;
  display:flex;flex-direction:column;gap:10px}
.float-capsule button{width:48px;height:48px;border-radius:24px;border:1px solid var(--line);
  background:var(--panel);color:var(--txt);cursor:pointer;display:flex;align-items:center;justify-content:center;
  box-shadow:0 8px 24px rgba(0,0,0,.4);transition:.2s}
.float-capsule button:hover{border-color:var(--brand);color:var(--brand)}
.float-capsule .ic{font-size:20px;line-height:1}
.float-capsule .lbl{font-size:10px;margin-top:2px}
.wx-modal{position:fixed;inset:0;background:rgba(0,0,0,.7);display:none;align-items:center;justify-content:center;z-index:80}
.wx-modal.open{display:flex}
.wx-modal .wx-box{position:relative;background:#fff;border-radius:12px;padding:8px;line-height:0}
.wx-modal img{width:300px;height:500px;object-fit:contain;display:block;border-radius:8px}
.wx-modal .close{position:absolute;top:-14px;right:-14px;width:32px;height:32px;border-radius:50%;
  background:#fff;border:none;color:#222;font-size:18px;cursor:pointer;line-height:1}

/* ===== 响应式 ===== */
@media (max-width:900px){
  .layout-body{grid-template-columns:1fr}
  .breadcrumb{grid-column:1;grid-row:1}
  .article-main{grid-column:1;grid-row:2}
  .toc-aside{grid-column:1;grid-row:3;position:static;max-height:none;margin-top:24px}
  .list-layout{grid-template-columns:1fr}
  .spec-grid{grid-template-columns:1fr}
  .nav-toggle{display:block}
  .nav-links{display:none;position:absolute;top:62px;left:0;right:0;flex-direction:column;
    background:var(--panel);border-bottom:1px solid var(--line);padding:10px}
  .nav-links.open{display:flex}
  .nav-links .has-sub>.sub{position:static;display:none;box-shadow:none;border:none;background:var(--panel-2);margin:4px 0}
  .nav-links .has-sub.open>.sub{display:block}
  .footer-inner{grid-template-columns:1fr}
}