/* ===== 联维镁合金主题 ===== */
:root{
  --brand:#0090d8; --brand-d:#0077b6; --brand-l:#e6f4fb;
  --green:#30a030; --ink:#22303c; --muted:#6b7c8c; --line:#e5ecf2;
  --shadow:0 10px 30px rgba(0,60,110,.08); --radius:14px;
  --tile:#f2f6fa;
}
*{scroll-behavior:smooth}
body{color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:#fff}
.container,.container-xxl{max-width:1380px!important;width:100%}
a{color:var(--brand);text-decoration:none}
a:hover{color:var(--brand-d)}
img{max-width:100%}

/* ---- 头部 ---- */
.site-header{position:sticky;top:0;z-index:1030;background:#fff;border-bottom:1px solid var(--line);transition:.25s}
.home-overlay .site-header{position:fixed;left:0;right:0;border-bottom:0;background:transparent}
.home-overlay .site-header.solid{background:#fff;box-shadow:var(--shadow);border-bottom:1px solid var(--line)}
.hdr-inner{display:flex;align-items:center;height:82px;gap:24px}
.brand img{height:52px;display:block}
.home-overlay .site-header:not(.solid) .brand img{filter:brightness(0) invert(1)}
.nav-desktop{flex:1;display:flex;justify-content:center}
.nav-list{display:flex;list-style:none;margin:0;padding:0;gap:6px}
.nav-list>li{position:relative}
.nav-list>li>a{display:block;padding:10px 16px;font-size:16px;font-weight:600;color:var(--ink);border-radius:8px}
.home-overlay .site-header:not(.solid) .nav-list>li>a{color:#fff}
.nav-list>li>a.on,.nav-list>li>a:hover{color:var(--brand);background:var(--brand-l)}
.home-overlay .site-header:not(.solid) .nav-list>li>a.on,
.home-overlay .site-header:not(.solid) .nav-list>li>a:hover{color:#fff;background:rgba(0,144,216,.85)}
.nav-list .sub{position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(8px);
  min-width:170px;background:#fff;border-radius:10px;box-shadow:var(--shadow);padding:8px;
  opacity:0;visibility:hidden;transition:.2s;border:1px solid var(--line)}
.nav-list>li:hover .sub{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
.nav-list .sub a{display:block;padding:9px 14px;border-radius:8px;color:var(--ink);font-size:14px}
.nav-list .sub a:hover{background:var(--brand-l);color:var(--brand)}
.hdr-tel{display:flex;align-items:center;gap:10px;color:var(--brand);flex:0 0 auto;white-space:nowrap}
.hdr-tel i{font-size:26px}
.hdr-tel small{display:block;color:var(--muted);font-size:12px}
.hdr-tel b a{color:var(--brand);font-size:18px}
.home-overlay .site-header:not(.solid) .hdr-tel small{color:rgba(255,255,255,.85)}
.home-overlay .site-header:not(.solid) .hdr-tel b a,.home-overlay .site-header:not(.solid) .hdr-tel i{color:#fff}
.nav-toggler{display:none;border:0;background:transparent;font-size:28px;color:var(--brand)}
.home-overlay .site-header:not(.solid) .nav-toggler{color:#fff;background:rgba(10,25,40,.38);border-radius:10px;width:46px;height:40px}
.nav-mobile{display:none;flex-direction:column;background:#fff;padding:12px 20px;border-top:1px solid var(--line);box-shadow:var(--shadow)}
.nav-mobile a{padding:11px 8px;border-bottom:1px solid var(--line);color:var(--ink);font-size:15px}
.nav-mobile .nm-group{font-weight:700;color:var(--brand);padding:12px 8px 4px;font-size:15px}
.nav-mobile .nm-sub{padding-left:22px;font-size:14px;color:var(--muted)}
.nav-mobile .nm-tel{color:#fff;background:var(--brand);border-radius:10px;text-align:center;margin-top:12px;font-weight:700}
@media (max-width:1386px){
  .nav-desktop,.hdr-tel{display:none!important}
  .nav-toggler{display:block}
  .nav-mobile.show{display:flex}
  .hdr-inner{height:66px;justify-content:space-between}
}

/* ---- 首页 Banner ---- */
.hero{position:relative;height:900px;max-height:96vh;overflow:hidden}
.hero-slide{position:absolute;inset:0;background-size:cover;background-position:center top;opacity:0;transition:opacity 1s}
.hero-slide.on{opacity:1}
.hero::before{content:"";position:absolute;left:0;right:0;top:0;height:130px;z-index:2;pointer-events:none;background:linear-gradient(180deg,rgba(0,18,32,.55),rgba(0,18,32,0))}
.hero-hit{position:absolute;inset:0;z-index:1}
.hero-txt{position:absolute;inset:0;z-index:3;display:flex;align-items:center;pointer-events:none}
.hero-copy{position:relative;pointer-events:auto;margin-right:auto;max-width:720px;text-align:left;color:#fff;
  text-shadow:0 2px 18px rgba(0,12,24,.55)}
.hero-copy::before{content:"";position:absolute;z-index:-1;top:-34px;left:-46px;bottom:-40px;right:-92px;
  border-radius:26px;filter:blur(10px);
  background:linear-gradient(90deg,rgba(2,16,28,.62),rgba(2,16,28,.45) 72%,rgba(2,16,28,0) 100%)}
.hero-copy .kicker{display:inline-block;font-size:15px;letter-spacing:2px;font-weight:600;
  color:#cdeeff;border-bottom:2px solid var(--brand);padding-bottom:8px;margin-bottom:20px}
.hero-copy h2{font-size:46px;font-weight:800;line-height:1.3;margin:0 0 16px;text-wrap:balance}
.hero-copy p{font-size:18px;line-height:1.95;margin:0 0 30px;color:rgba(255,255,255,.9)}
.hero-btns{display:flex;gap:14px;justify-content:flex-start;flex-wrap:wrap}
.hero-tel{display:inline-flex;align-items:center;gap:9px;background:var(--brand);color:#fff;
  border-radius:10px;padding:14px 28px;font-size:19px;font-weight:700;transition:.25s}
.hero-tel:hover{background:var(--brand-d);color:#fff;transform:translateY(-2px)}
.hero-more{display:inline-flex;align-items:center;gap:7px;border:1px solid rgba(255,255,255,.6);
  color:#fff;border-radius:10px;padding:14px 24px;font-size:16px;transition:.25s}
.hero-more:hover{background:#fff;color:var(--brand-d);border-color:#fff}
.hero-dots{position:absolute;bottom:44px;left:50%;transform:translateX(-50%);display:flex;gap:10px;z-index:4}
.hero-dots button{width:34px;height:5px;border:0;border-radius:3px;background:rgba(255,255,255,.55)}
.hero-dots button.on{background:#fff;width:52px}
@media (max-width:1400px){.hero{height:760px}.hero-copy{max-width:640px}.hero-copy h2{font-size:40px}.hero-copy p{font-size:16px}}
@media (max-width:1100px){.hero{height:620px}.hero-copy{max-width:560px}.hero-copy h2{font-size:32px}
  .hero-copy .kicker{font-size:13px;margin-bottom:14px}.hero-copy p{margin-bottom:22px}
  .hero-tel{padding:12px 22px;font-size:17px}.hero-more{padding:12px 18px;font-size:15px}}
@media (max-width:768px){
  .hero{height:460px;max-height:70vh}
  .hero::after{content:"";position:absolute;inset:0;z-index:2;pointer-events:none;
    background:linear-gradient(0deg,rgba(0,14,26,.82),rgba(0,14,26,.38) 46%,rgba(0,14,26,0) 78%)}
  .hero-txt{align-items:flex-end;padding-bottom:64px}
  .hero-copy{margin:0;max-width:none;text-align:left}
  .hero-copy::before{display:none}
  .hero-copy h2{font-size:26px;margin-bottom:10px}
  .hero-copy .kicker{font-size:12px;letter-spacing:1px;padding-bottom:6px;margin-bottom:12px}
  .hero-copy p{font-size:14px;line-height:1.75;margin-bottom:18px;display:-webkit-box;
    -webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
  .hero-btns{justify-content:flex-start;gap:10px}
  .hero-tel{padding:10px 18px;font-size:15px}.hero-more{padding:10px 14px;font-size:13px}
  .hero-dots{bottom:22px}}

/* ---- 通用版块 ---- */
.section{padding:72px 0}
.section.alt{background:#f6fafd}
.sec-head{text-align:center;margin-bottom:44px}
.sec-head .en{color:var(--brand);font-weight:700;letter-spacing:3px;font-size:14px;text-transform:uppercase}
.sec-head h2{font-size:32px;font-weight:800;margin:6px 0 10px}
.sec-head p{color:var(--muted);margin:0}
.sec-head .bar{width:60px;height:4px;background:var(--brand);border-radius:2px;margin:14px auto 0}

/* 产品分类卡片 */
.cat-card{display:block;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:14px;text-align:center;transition:.25s;height:100%}
.cat-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:var(--brand)}
.cat-card .thumb{aspect-ratio:3/2;background:var(--tile);border-radius:10px;overflow:hidden;display:flex;align-items:center;justify-content:center;margin-bottom:14px}
.cat-card .thumb img{width:100%;height:100%;object-fit:cover;transition:.3s}
.cat-card:hover .thumb img{transform:scale(1.07)}
.cat-card h3{font-size:18px;margin:0 0 6px}
.cat-card p{color:var(--muted);font-size:13px;margin:0;min-height:20px}

/* 产品卡 */
.prod-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.25s;height:100%;display:flex;flex-direction:column}
.prod-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
/* 产品主图统一 500×500 方图，厂标/文字条烧在图里，方框一比一展示才不裁切 */
.prod-card .pimg{aspect-ratio:1/1;background:#f4f7fa;display:flex;align-items:center;justify-content:center;overflow:hidden}
.prod-card .pimg img{width:100%;height:100%;object-fit:contain;transition:.4s}
.prod-card:hover .pimg img{transform:scale(1.06)}
.prod-card .pctg{background:var(--brand);color:#fff;font-size:12px;padding:2px 10px;border-radius:0 0 8px 0}
.prod-card h4{font-size:15px;line-height:1.5;margin:0;padding:14px 16px;color:var(--ink);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:52px}

/* 新闻 */
.news-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.25s;height:100%}
.news-card:hover{box-shadow:var(--shadow);transform:translateY(-4px)}
.news-card .nimg{aspect-ratio:16/10;overflow:hidden}
.news-card .nimg img{width:100%;height:100%;object-fit:cover}
.news-card .nbody{padding:18px}
.news-card .ndate{color:var(--brand);font-size:13px;font-weight:600}
.news-card h4{font-size:16px;margin:8px 0}
.news-card p{color:var(--muted);font-size:13px;line-height:1.8;margin:0;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.news-row{display:flex;gap:14px;padding:16px 0;border-bottom:1px dashed var(--line)}
.news-row .dt{flex:0 0 62px;text-align:center;background:var(--brand-l);border-radius:10px;padding:8px 0;color:var(--brand)}
.news-row .dt b{display:block;font-size:22px;line-height:1}
.news-row .bd h4{font-size:16px;margin:0 0 6px}
.news-row .bd a{color:var(--ink)}
.news-row .ntag{display:inline-block;font-size:12px;font-weight:600;color:var(--brand);background:var(--brand-l);border-radius:6px;padding:2px 8px;margin-right:8px;vertical-align:2px}
.news-row .bd p{color:var(--muted);font-size:13px;margin:0;line-height:1.7;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
/* 列表缩略图：只有配了封面的文章才出现，比例与卡片一致 */
.news-row .th{flex:0 0 176px;align-self:flex-start;border-radius:8px;overflow:hidden;background:#f4f7fa}
.news-row .th img{display:block;width:100%;aspect-ratio:16/10;object-fit:cover;transition:.4s}
.news-row:hover .th img{transform:scale(1.05)}
@media (max-width:768px){.news-row .th{flex:0 0 108px}}

/* ---- 内页布局 ---- */
.inner-banner{position:relative;height:340px;background-size:cover;background-position:center;
  display:flex;align-items:center;margin-top:0}
.home-overlay .inner-banner{margin-top:82px}
.inner-banner::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(0,40,70,.55),rgba(0,60,100,.25))}
.inner-banner-in{position:relative;color:#fff}
.inner-banner-in h1{font-size:34px;font-weight:800;margin:0}
.inner-banner-in .crumb{margin-top:10px;font-size:14px;color:rgba(255,255,255,.9)}
.inner-banner-in .crumb a{color:#fff}
@media (max-width:768px){.inner-banner{height:220px}.inner-banner-in h1{font-size:24px}.home-overlay .inner-banner{margin-top:66px}}

.page-layout{display:flex;gap:30px;padding:50px 0}
.side-nav{flex:0 0 250px}
.side-nav .box{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.side-nav h3{background:var(--brand);color:#fff;font-size:18px;padding:16px 20px;margin:0}
.side-nav a{display:flex;justify-content:space-between;align-items:center;padding:14px 20px;border-bottom:1px solid var(--line);color:var(--ink);font-size:15px}
.side-nav a:hover,.side-nav a.on{background:var(--brand-l);color:var(--brand);font-weight:600}
.side-contact{margin-top:20px;background:linear-gradient(160deg,var(--brand),var(--brand-d));color:#fff;border-radius:var(--radius);padding:22px}
.side-contact h4{font-size:16px;margin:0 0 6px}
.side-contact .big{font-size:22px;font-weight:800}
.side-contact a{color:#fff}
.main-col{flex:1;min-width:0}
/* 窄屏：侧栏不再占宽，正文先显示、侧栏落到下方 */
@media (max-width:992px){
  .page-layout{flex-direction:column;gap:26px;padding:34px 0}
  .page-layout>.main-col{order:1;width:100%;flex:0 0 auto}
  .page-layout>.side-nav,.page-layout>.side-toc{order:2;width:100%;flex:0 0 auto}
  .side-toc .box{position:static}
}
/* 无左侧栏的单页：正文居中 + 右侧目录栏 */
.page-layout.rail-right{justify-content:center;align-items:flex-start}
.main-col.solo{flex:1 1 auto;max-width:920px}
.side-toc{flex:0 0 250px;align-self:stretch}
.side-toc .box{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:16px 20px;position:sticky;top:100px}
.side-toc h4{font-size:15px;color:var(--brand-d);margin:0 0 4px}
.side-toc .box a{display:block;font-size:14px;color:var(--ink);line-height:1.6;padding:9px 0;border-bottom:1px dashed var(--line)}
.side-toc .box a:last-child{border-bottom:0;padding-bottom:2px}
.side-toc .box a:hover{color:var(--brand)}
@media (max-width:992px){.side-toc{display:none}}

/* 详情文档化排版 */
.doc{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:38px 42px}
@media (max-width:768px){.doc{padding:22px 16px}.doc h1.title{font-size:21px}.doc .meta{gap:10px 14px}}
.main-col.solo .doc{max-width:920px;margin:0 auto}
.doc h1.title{font-size:26px;font-weight:800;line-height:1.5;margin:0 0 6px}
.doc .meta{color:var(--muted);font-size:13px;display:flex;gap:18px;flex-wrap:wrap;padding-bottom:16px;border-bottom:1px solid var(--line);margin-bottom:24px}
.article-body{font-size:16px;line-height:2;color:#2b3a46;max-width:820px}
/* 文章封面：与列表缩略图同比例，宽度跟正文对齐 */
.doc-cover{display:block;width:100%;max-width:820px;aspect-ratio:16/10;object-fit:cover;border-radius:10px;margin:0 0 24px;background:var(--tile)}
.article-body p{margin:0 0 16px;text-indent:0}
.article-body img{border-radius:10px;margin:12px 0;height:auto!important}
.article-body strong{color:var(--brand-d)}
.doc-nav{display:flex;justify-content:space-between;gap:14px;margin-top:28px;border-top:1px solid var(--line);padding-top:20px}
.doc-nav a{flex:1;padding:12px 16px;border:1px solid var(--line);border-radius:10px;color:var(--ink);font-size:14px}
.doc-nav a:hover{border-color:var(--brand);color:var(--brand)}

/* 产品详情 */
.pd-grid{display:grid;grid-template-columns:460px 1fr;gap:36px}
@media (max-width:992px){.pd-grid{grid-template-columns:1fr}}
.pd-gallery .main{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#f4f7fa;aspect-ratio:1/1;display:flex;align-items:center;justify-content:center}
.pd-gallery .main img{max-height:100%;object-fit:contain}
.pd-thumbs{display:flex;gap:10px;margin-top:12px;flex-wrap:wrap}
.pd-thumbs button{width:72px;height:72px;border:2px solid var(--line);border-radius:10px;background:#f4f7fa;padding:0;overflow:hidden}
.pd-thumbs button.on{border-color:var(--brand)}
.pd-thumbs img{width:100%;height:100%;object-fit:cover}
.pd-info h1{font-size:26px;font-weight:800;line-height:1.5;margin:0 0 14px}
.pd-info .lead{color:var(--muted);line-height:1.9;background:#f6fafd;border-radius:10px;padding:16px 18px}
.pd-attrs{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:20px 0}
@media (max-width:640px){.pd-attrs{grid-template-columns:1fr}}
.pd-attrs .kv{border:1px solid var(--line);border-radius:10px;padding:12px 14px;background:#fff}
.pd-attrs .kv .k{color:var(--brand);font-size:13px;font-weight:700}
.pd-attrs .kv .v{font-size:14px;color:#2b3a46;line-height:1.7;margin-top:4px}
.pd-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:8px}
.btn-brand{background:var(--brand);color:#fff;border:0;border-radius:10px;padding:12px 26px;font-weight:600}
.btn-brand:hover{background:var(--brand-d);color:#fff}
.btn-line{background:#fff;color:var(--brand);border:1px solid var(--brand);border-radius:10px;padding:12px 26px;font-weight:600}
.btn-line:hover{background:var(--brand-l)}

/* 列表页 */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
@media (max-width:992px){.grid-3{grid-template-columns:repeat(2,1fr)}}
@media (max-width:560px){.grid-3{grid-template-columns:1fr}}

/* 分页 */
.pager{display:flex;gap:8px;justify-content:center;margin-top:36px;flex-wrap:wrap}
.pager a,.pager span{min-width:42px;height:42px;display:flex;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:10px;padding:0 12px;color:var(--ink);background:#fff}
.pager a:hover{border-color:var(--brand);color:var(--brand)}
.pager .cur{background:var(--brand);color:#fff;border-color:var(--brand)}

/* CTA 条 */
.cta-band{background:linear-gradient(120deg,var(--brand),var(--green));color:#fff;border-radius:var(--radius);padding:44px 40px;display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}
.cta-band h3{font-size:26px;margin:0 0 6px}
.cta-band .btns{display:flex;gap:14px;flex-wrap:wrap}
.cta-band .b1,.cta-band .b2{border-radius:12px;padding:14px 30px;font-weight:700}
.cta-band .b1{background:#fff;color:var(--brand)}
.cta-band .b2{border:2px solid #fff;color:#fff}

/* 特色条（首页） */
.feature-strip{display:grid;grid-template-columns:repeat(7,1fr);gap:14px;margin-top:40px}
@media (max-width:992px){.feature-strip{grid-template-columns:repeat(4,1fr)}}
@media (max-width:560px){.feature-strip{grid-template-columns:repeat(2,1fr)}}
.feature-strip .f{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 10px;text-align:center;color:var(--ink);font-weight:600}
.feature-strip .f i{display:block;color:var(--brand);font-size:24px;margin-bottom:8px}

/* 关于区块 */
.about-flex{display:grid;grid-template-columns:1.3fr 1fr;gap:44px;align-items:center}
@media (max-width:992px){.about-flex{grid-template-columns:1fr;gap:26px}}
.about-flex img{width:100%;aspect-ratio:774/320;object-fit:cover;display:block;border-radius:var(--radius);box-shadow:var(--shadow)}
.about-flex .txt h3{font-size:24px;font-weight:800}
.about-flex .txt p{color:var(--muted);line-height:2}

/* 页脚 */
.site-footer{background:#15222e;color:#9fb0bf;padding:56px 0 24px;font-size:14px}
.site-footer h6{color:#fff;font-size:16px;margin-bottom:18px}
.site-footer a{color:#9fb0bf;display:inline-block;margin-bottom:8px}
.site-footer h6~a{display:block}
.site-footer a:hover{color:var(--brand)}
.site-footer .f-logo{margin-bottom:14px}
.site-footer .f-tel{font-size:22px;color:#fff;font-weight:800}
.site-footer .f-tel i{color:var(--brand)}
.site-footer .f-about p{line-height:1.9}
.site-footer .f-line i{color:var(--brand)}
.site-footer .f-links a{margin-right:12px}
.f-copy{border-top:1px solid #24313d;margin-top:30px;padding-top:20px;text-align:center;color:#7c8b99;font-size:13px}
.f-copy a{margin-left:10px}

/* 留言表单 */
.msg-form{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px}
.msg-form label{font-weight:600;font-size:14px;margin-bottom:6px}
.msg-form .form-control,.msg-form .form-control:focus{border:1px solid var(--line);border-radius:10px;padding:12px 14px;font-size:15px;box-shadow:none}
.msg-form .form-control:focus{border-color:var(--brand)}
.hp-field{position:absolute;left:-5000px}
.cap-row{display:flex;gap:12px;align-items:center}
.cap-row img{height:44px;border-radius:8px;cursor:pointer;border:1px solid var(--line)}

/* 悬浮 CTA */
.float-cta{position:fixed;right:16px;bottom:80px;z-index:1020;background:var(--brand);color:#fff;border-radius:30px;padding:12px 18px;font-weight:700;box-shadow:var(--shadow)}

/* 富文本正文（单页） */
.rich-body{line-height:2;color:#2b3a46;font-size:16px}
.rich-body p{margin-bottom:16px}
.rich-body img{border-radius:10px}
.article-body,.rich-body{counter-reset:sec}
.article-body h2,.article-body h3,.rich-body h2,.rich-body h3{font-size:18px;font-weight:700;color:var(--ink);line-height:1.6;margin:26px 0 12px;padding-left:12px;border-left:4px solid var(--brand);counter-increment:sec}
.article-body h2::before,.article-body h3::before,.rich-body h2::before,.rich-body h3::before{content:counter(sec) ". ";color:var(--brand-d)}
.article-body ul,.article-body ol,.rich-body ul,.rich-body ol{margin:0 0 16px;padding-left:26px}
.article-body li,.rich-body li{margin-bottom:8px}
.article-body table,.rich-body table{width:100%;border-collapse:collapse;margin:0 0 18px;font-size:15px}
.article-body th,.article-body td,.rich-body th,.rich-body td{border:1px solid var(--line);padding:9px 12px;text-align:left}
.article-body th,.rich-body th{background:var(--tile);color:var(--ink);font-weight:700}
.article-body blockquote,.rich-body blockquote{margin:0 0 16px;padding:12px 16px;background:var(--brand-l);border-left:4px solid var(--brand);border-radius:0 8px 8px 0}
.empty-tip{text-align:center;color:var(--muted);padding:80px 0}
.empty-tip i{font-size:52px;color:var(--line);display:block;margin-bottom:16px}

/* 小节锚点（目录见 .side-toc） */
.sec-head-line{font-weight:700;color:var(--brand-d);scroll-margin-top:110px}