:root{
  --brand:#3b6ef0; --brand-d:#2451c9; --brand-x:#1d3fa8;
  --brand-light:#eaf1ff; --brand-soft:#dbe7ff;
  --accent:#0ea5e9;
  --bg:#eef3fb; --bg2:#f6f9ff; --card:#fff;
  --text:#1f2733; --muted:#8a93a3; --line:#e6ebf3;
  --radius:16px;
  --shadow-sm:0 2px 8px rgba(36,81,201,.06);
  --shadow:0 6px 20px rgba(36,81,201,.10);
  --shadow-lg:0 12px 30px rgba(36,81,201,.18);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;background:linear-gradient(180deg,#e9f0ff 0%,#eef3fb 260px);background-attachment:fixed;color:var(--text);line-height:1.6;}
a{color:inherit;text-decoration:none;}

/* ---------------- 顶部导航 ---------------- */
.nav{background:linear-gradient(120deg,var(--brand),var(--brand-d));color:#fff;padding:12px 16px;position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;box-shadow:0 2px 12px rgba(36,81,201,.25);backdrop-filter:saturate(140%) blur(8px);}
.nav .brand{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:700;letter-spacing:1px;cursor:pointer;}
.nav .brand small{font-weight:400;opacity:.82;font-size:11px;margin-left:2px;}
.brand-mark{width:30px;height:30px;border-radius:9px;background:rgba(255,255,255,.18);display:flex;align-items:center;justify-content:center;font-size:17px;font-weight:800;}
.nav a.admin{color:#fff;font-size:13px;opacity:.95;border:1px solid rgba(255,255,255,.45);padding:5px 12px;border-radius:16px;white-space:nowrap;}

/* ---------------- 容器 ---------------- */
.container{max-width:100%;margin:0 auto;padding:14px 14px 40px;}
@media(min-width:768px){.container{max-width:720px;}}
@media(min-width:1024px){.container{max-width:940px;}}
@media(min-width:1280px){.container{max-width:1140px;}}
.home{padding-top:10px;}

/* ---------------- 欢迎横幅 ---------------- */
.welcome{position:relative;overflow:hidden;background:linear-gradient(135deg,var(--brand) 0%,var(--brand-d) 55%,#2f6ae0 100%);border-radius:20px;padding:22px 20px 20px;margin-bottom:18px;color:#fff;box-shadow:var(--shadow);}
.welcome::after{content:'';position:absolute;right:-40px;top:-40px;width:160px;height:160px;border-radius:50%;background:rgba(255,255,255,.12);}
.welcome::before{content:'';position:absolute;right:34px;bottom:-54px;width:120px;height:120px;border-radius:50%;background:rgba(14,165,233,.28);}
.welcome-title{font-size:21px;font-weight:800;letter-spacing:.5px;position:relative;z-index:1;}
.welcome-sub{font-size:13px;opacity:.92;margin-top:6px;line-height:1.65;position:relative;z-index:1;max-width:92%;}
.welcome-cta{display:inline-flex;align-items:center;gap:6px;margin-top:14px;background:#fff;color:var(--brand-d);font-size:13px;font-weight:700;padding:8px 16px;border-radius:20px;position:relative;z-index:1;transition:transform .15s,box-shadow .15s;}
.welcome-cta:active{transform:scale(.97);}
.welcome-cta:hover{box-shadow:0 6px 16px rgba(0,0,0,.18);}

/* ---------------- 搜索 ---------------- */
.top-search{position:relative;margin-bottom:16px;}
.top-search .search-icon{position:absolute;left:14px;top:50%;transform:translateY(-50%);font-size:14px;opacity:.55;}
.top-search input{width:100%;height:44px;border:1px solid var(--line);border-radius:22px;padding:0 16px 0 38px;outline:none;font-size:14px;background:#fff;box-shadow:0 2px 8px rgba(36,81,201,.06);}
.top-search input:focus{border-color:var(--brand);box-shadow:0 2px 12px rgba(59,110,240,.18);}

/* ---------------- 三大栏目入口 ---------------- */
.gate-row{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:18px;}
.gate-card{background:var(--card);border-radius:16px;padding:18px 8px 15px;text-align:center;box-shadow:var(--shadow-sm);border:1px solid rgba(59,110,240,.06);display:flex;flex-direction:column;align-items:center;gap:9px;transition:transform .18s,box-shadow .18s;}
.gate-card:active{transform:scale(.97);}
.gate-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);}
.gate-icon{width:58px;height:58px;border-radius:50%;background:linear-gradient(135deg,var(--brand-soft),#cfe0ff);display:flex;align-items:center;justify-content:center;font-size:30px;}
.gate-name{font-size:14px;font-weight:600;color:var(--text);}

/* ---------------- 顶部广告条 ---------------- */
.ad-strip{margin-bottom:18px;background:var(--card);border-radius:16px;padding:12px 12px 14px;box-shadow:0 4px 14px rgba(36,81,201,.08);}
.ad-strip-head{font-size:12px;color:var(--muted);margin-bottom:10px;display:flex;align-items:center;gap:6px;}
.ad-strip-head::before{content:'';width:3px;height:12px;background:var(--accent);border-radius:2px;}
.ad-strip-track{display:flex;gap:10px;overflow-x:auto;padding-bottom:4px;}
.ad-strip-track::-webkit-scrollbar{height:0;}
.ad-chip{flex:0 0 auto;display:flex;align-items:center;gap:8px;background:var(--bg2);border:1px solid var(--line);border-radius:12px;padding:8px 12px;max-width:220px;}
.ad-chip img{width:40px;height:40px;border-radius:8px;object-fit:cover;flex-shrink:0;background:var(--brand-soft);}
.ad-chip span{font-size:13px;font-weight:500;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}

/* ---------------- 栏目区 ---------------- */
.home-section{margin-bottom:30px;scroll-margin-top:64px;}
.section-header{display:flex;align-items:center;justify-content:flex-start;gap:10px;margin-bottom:16px;position:relative;}
.section-header::before{content:'';width:4px;height:18px;background:linear-gradient(180deg,var(--brand),var(--accent));border-radius:3px;flex:0 0 auto;}
.section-header::after{display:none;}
.section-icon{font-size:20px;}
.section-title{font-size:17px;font-weight:700;color:var(--brand-d);white-space:nowrap;letter-spacing:.3px;}

/* 二级分类块 */
.sub-block{margin-bottom:18px;}
.sub-head{display:flex;align-items:center;gap:8px;margin-bottom:12px;padding-left:4px;}
.sub-icon{width:30px;height:30px;border-radius:9px;background:var(--brand-light);display:flex;align-items:center;justify-content:center;font-size:16px;flex-shrink:0;}
.sub-name{font-size:15px;font-weight:700;color:var(--text);}
.sub-more{margin-left:auto;font-size:12px;color:var(--brand);background:var(--brand-light);padding:4px 10px;border-radius:12px;}

/* ---------------- 文章卡片网格 ---------------- */
.art-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:2px;}
@media(min-width:560px){.art-grid{grid-template-columns:repeat(2,1fr);gap:14px;}}
@media(min-width:900px){.art-grid{grid-template-columns:repeat(3,1fr);gap:16px;}}
.art-card{background:var(--card);border-radius:16px;overflow:hidden;box-shadow:var(--shadow-sm);border:1px solid rgba(59,110,240,.05);transition:transform .18s,box-shadow .18s;display:block;}
.art-card:active{transform:scale(.98);}
.art-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);}
.art-cover{position:relative;width:100%;padding-top:58%;background:linear-gradient(135deg,var(--brand-soft),#cfe0ff);}
.art-cover img,.art-cover .emoji{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;}
.art-cover .emoji{display:flex;align-items:center;justify-content:center;font-size:40px;color:#fff;}
.art-cover.noimg::after{content:'📄';position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:34px;}
.art-title{font-size:14.5px;font-weight:600;line-height:1.45;padding:11px 12px 4px;color:var(--text);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.art-date{font-size:11px;color:var(--muted);padding:0 12px 2px;}
.art-meta{display:flex;gap:12px;font-size:11px;color:var(--muted);padding:0 12px 11px;}
.art-meta span{display:inline-flex;align-items:center;}

/* ---------------- 信息流广告 ---------------- */
.feed-ad{position:relative;display:block;margin:10px 0 4px;border-radius:16px;overflow:hidden;box-shadow:var(--shadow-sm);min-height:96px;background:linear-gradient(135deg,var(--brand),var(--brand-d));transition:transform .18s,box-shadow .18s;}
.feed-ad:hover{transform:translateY(-2px);box-shadow:var(--shadow);}
.feed-ad img{width:100%;height:120px;object-fit:cover;display:block;}
.feed-ad-article{display:flex;align-items:center;gap:12px;padding:12px;min-height:auto;}
.feed-ad-article img{width:72px;height:72px;border-radius:10px;flex-shrink:0;}
.feed-ad-tag{position:absolute;top:8px;left:8px;background:rgba(14,165,233,.92);color:#fff;font-size:10px;padding:2px 7px;border-radius:8px;z-index:2;}
.feed-ad-title{position:relative;z-index:2;color:#fff;font-size:15px;font-weight:700;padding:10px 12px;text-shadow:0 1px 4px rgba(0,0,0,.4);}
.feed-ad-article .feed-ad-title{color:var(--text);text-shadow:none;padding:0;font-size:14px;}

/* ---------------- 面包屑 ---------------- */
.crumb{display:flex;align-items:center;flex-wrap:wrap;gap:6px;margin-bottom:14px;font-size:13px;color:var(--muted);}
.crumb-item{display:inline-flex;align-items:center;gap:4px;}
.crumb-item.active{color:var(--brand-d);font-weight:700;}
.crumb-sep{color:var(--line);}

/* ---------------- 页脚 ---------------- */
.site-foot{text-align:center;color:var(--muted);font-size:12px;margin-top:30px;padding-top:18px;border-top:1px solid var(--line);line-height:1.7;}

.empty{text-align:center;color:var(--muted);padding:40px 20px;font-size:14px;}

/* ===================================================================
   以下为文章/产品/案例/评论/推广等内页通用样式（保持兼容）
   =================================================================== */
.search{display:flex;gap:8px;margin-bottom:12px;}
.search input{flex:1;height:38px;border:1px solid var(--line);border-radius:20px;padding:0 16px;outline:none;font-size:14px;}
.search input:focus{border-color:var(--brand);}
.cates{display:flex;gap:14px;overflow-x:auto;padding:4px 0 12px;border-bottom:1px solid var(--line);margin-bottom:12px;}
.cates::-webkit-scrollbar{display:none;}
.cate{font-size:14px;color:var(--muted);white-space:nowrap;padding-bottom:4px;cursor:pointer;}
.cate.active{color:var(--text);font-weight:600;border-bottom:2px solid var(--brand);}
.card{background:var(--card);border-radius:12px;padding:14px;margin-bottom:12px;box-shadow:0 1px 6px rgba(0,0,0,.04);cursor:pointer;display:flex;gap:12px;}
.card .cover{width:96px;height:96px;border-radius:8px;object-fit:cover;background:linear-gradient(135deg,#cfe0f3,#a9c5e6);flex-shrink:0;}
.card .cover.emoji{display:flex;align-items:center;justify-content:center;font-size:30px;color:#fff;}
.card .body{flex:1;min-width:0;}
.card h3{margin:0 0 6px;font-size:16px;line-height:1.4;}
.card .summary{font-size:13px;color:var(--muted);line-height:1.5;margin:0 0 8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.card .meta{font-size:12px;color:var(--muted);display:flex;gap:10px;}
.card .meta .tag{color:var(--brand);}
.skeleton{background:#fff;border-radius:12px;padding:14px;margin-bottom:12px;}
.skeleton .bar{height:14px;background:#eef0f3;border-radius:6px;margin-bottom:8px;}
.article-wrap{max-width:760px;margin:0 auto;padding:16px;}
.article-wrap h1{font-size:22px;line-height:1.4;margin:6px 0 12px;}
.article-meta{font-size:12px;color:var(--muted);display:flex;gap:12px;margin-bottom:14px;flex-wrap:wrap;}
.article-cover{width:100%;height:200px;border-radius:12px;object-fit:cover;background:linear-gradient(135deg,#cfe0f3,#a9c5e6);margin-bottom:14px;}
.article-body{font-size:15px;line-height:1.8;color:#2c3038;}
.article-body p{margin:0 0 14px;}
.article-body img{max-width:100%;border-radius:8px;}
.comments{margin-top:24px;border-top:1px solid var(--line);padding-top:16px;}
.comments h4{font-size:15px;margin:0 0 12px;}
.cmt{display:flex;gap:10px;margin-bottom:14px;}
.cmt .avatar{width:32px;height:32px;border-radius:50%;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;font-size:13px;flex-shrink:0;}
.cmt .name{font-size:13px;color:var(--brand);margin-bottom:2px;}
.cmt .text{font-size:14px;line-height:1.5;}
.cmt .time{font-size:11px;color:var(--muted);margin-top:3px;}
.cmt-form{display:flex;gap:8px;margin:12px 0;}
.cmt-form input{flex:1;height:38px;border:1px solid var(--line);border-radius:8px;padding:0 12px;outline:none;}
.cmt-form button{height:38px;padding:0 16px;border:none;border-radius:8px;background:var(--brand);color:#fff;}
.promo-mask{position:fixed;inset:0;background:rgba(0,0,0,.5);display:none;align-items:flex-end;z-index:40;}
.promo-mask.show{display:flex;}
.promo-sheet{background:#fff;width:100%;border-radius:18px 18px 0 0;padding:20px;max-width:760px;margin:0 auto;}
.promo-sheet h3{margin:0 0 14px;font-size:17px;}
.promo-qr{text-align:center;margin-bottom:14px;}
.promo-qr img{width:200px;height:200px;border:1px solid var(--line);border-radius:12px;}
.promo-link{display:flex;gap:8px;margin-bottom:12px;}
.promo-link input{flex:1;height:40px;border:1px solid var(--line);border-radius:8px;padding:0 10px;font-size:12px;outline:none;}
.promo-link button{height:40px;padding:0 14px;border:none;border-radius:8px;background:var(--brand);color:#fff;flex-shrink:0;}
.btn-close{width:100%;height:42px;border:none;border-radius:8px;background:#f0f1f3;color:var(--text);margin-top:10px;font-size:15px;}
@media(min-width:600px){ .promo-mask{align-items:center;} .promo-sheet{border-radius:18px;} }

.tabs{display:flex;background:#fff;border-radius:12px;padding:4px;margin-bottom:12px;box-shadow:0 1px 6px rgba(0,0,0,.04);}
.tabs .tab{flex:1;text-align:center;padding:9px 0;font-size:14px;color:var(--muted);border-radius:8px;cursor:pointer;transition:.15s;}
.tabs .tab.active{background:var(--brand);color:#fff;font-weight:600;}
.card .price{color:var(--accent);font-weight:600;font-size:15px;display:flex;align-items:center;gap:6px;}
.card .price .o{color:var(--muted);font-weight:400;font-size:12px;text-decoration:line-through;}
.card .price .stock{color:var(--muted);font-weight:400;margin-left:auto;font-size:12px;}
.card .meta .badge{color:var(--brand);}
.detail-wrap{max-width:760px;margin:0 auto;padding:16px 16px 30px;}
.detail-wrap h1{font-size:22px;line-height:1.4;margin:6px 0 12px;text-align:center;}
.detail-meta{font-size:12px;color:var(--muted);display:flex;gap:12px;margin-bottom:14px;flex-wrap:wrap;justify-content:center;align-items:center;}
.detail-meta .meta-cat{display:inline-flex;align-items:center;gap:4px;background:#eef4fb;color:var(--brand);padding:3px 10px;border-radius:12px;font-weight:500;}
.detail-meta .meta-cat-seg{color:var(--brand);text-decoration:none;transition:color .15s;}
.detail-meta .meta-cat-seg:hover{color:var(--accent);text-decoration:underline;}
.detail-meta .meta-sep{color:#a9b8c8;font-weight:400;padding:0 1px;}
.detail-meta .meta-cat-empty{background:#f3f5f8;color:#9aa5b3;}
.detail-cover{width:100%;height:220px;border-radius:12px;object-fit:cover;background:linear-gradient(135deg,#cfe0f3,#a9c5e6);margin:0 auto 14px;max-width:760px;display:block;}
.detail-body{font-size:15px;line-height:1.8;color:#2c3038;}
.detail-body img{max-width:100%;border-radius:8px;}
.gallery{display:flex;gap:8px;overflow-x:auto;margin:14px 0;padding-bottom:4px;}
.gallery img{width:120px;height:120px;border-radius:8px;object-fit:cover;flex-shrink:0;}
.gallery::-webkit-scrollbar{display:none;}
.case-badge{display:inline-block;background:#eef4fb;color:var(--brand);font-size:12px;padding:3px 10px;border-radius:12px;margin-right:6px;}
.detail-price{color:var(--accent);font-weight:700;font-size:22px;display:flex;align-items:center;gap:8px;margin:0 0 14px;}
.detail-price .o{color:var(--muted);font-weight:400;font-size:14px;text-decoration:line-through;}
.detail-price .stock{color:var(--muted);font-weight:400;font-size:13px;margin-left:auto;}
.nav-cols{display:flex;gap:14px;overflow-x:auto;padding:4px 0 12px;border-bottom:1px solid var(--line);margin-bottom:12px;}
.nav-cols::-webkit-scrollbar{display:none;}
.nav-col{font-size:14px;color:var(--muted);white-space:nowrap;padding-bottom:4px;cursor:pointer;border-bottom:2px solid transparent;}
.nav-col.active{color:var(--text);font-weight:600;border-bottom-color:var(--brand);}
.section-title{font-size:16px;margin:4px 0 12px;color:var(--text);}
.detail-body h3{font-size:16px;margin:18px 0 8px;color:var(--text);}
.preface{background:#f7f9fc;border-left:3px solid var(--brand);border-radius:8px;padding:12px 14px;margin:0 0 16px;color:#4a5568;font-size:14px;line-height:1.7;}
.preface h3{font-size:14px;margin:0 0 6px;color:var(--brand);}
.toast{position:fixed;left:50%;top:50%;transform:translate(-50%,-50%);background:rgba(0,0,0,.8);color:#fff;padding:12px 20px;border-radius:10px;font-size:14px;z-index:99;opacity:0;transition:.2s;pointer-events:none;}
.toast.show{opacity:1;}
.fpage{max-width:640px;margin:0 auto;padding:18px 16px 40px;}
.fpage h2{font-size:20px;margin:8px 0 4px;}
.fpage .desc{color:var(--muted);font-size:13px;margin-bottom:18px;}
.fld{margin-bottom:16px;}
.fld label{display:block;font-size:14px;margin-bottom:6px;}
.fld label .req{color:var(--accent);margin-left:3px;}
.fld input,.fld select,.fld textarea{width:100%;border:1px solid var(--line);border-radius:8px;padding:10px 12px;font-size:14px;outline:none;box-sizing:border-box;font-family:inherit;}
.fld input:focus,.fld select:focus,.fld textarea:focus{border-color:var(--brand);}
.fld textarea{min-height:96px;resize:vertical;}
.fld .radio-group{display:flex;flex-wrap:wrap;gap:14px;}
.fld .radio-group label{display:inline-flex;align-items:center;gap:5px;font-size:14px;font-weight:400;margin:0;cursor:pointer;}
.fld .radio-group input{width:auto;}
.fsubmit{width:100%;height:46px;border:none;border-radius:23px;background:var(--accent);color:#fff;font-size:16px;font-weight:600;margin-top:8px;}
.fdone{text-align:center;padding:40px 20px;}
.fdone .check{font-size:48px;color:var(--brand);}

@media(min-width:768px){
  .gate-row{gap:16px;}
}

/* ---------------- 首页双栏布局（主栏 + 侧栏榜单） ---------------- */
.home-layout{display:grid;grid-template-columns:1fr;gap:18px;margin-bottom:18px;align-items:start;}
@media(min-width:980px){
  .home-layout{grid-template-columns:1fr 320px;gap:30px;}
  .home-side{position:sticky;top:74px;align-self:start;max-height:calc(100vh - 90px);overflow-y:auto;overscroll-behavior:contain;}
}

/* ---------------- 侧栏榜单（点赞榜 / 编辑推荐） ---------------- */
.rank-card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px 14px 16px;margin-bottom:16px;box-shadow:var(--shadow-sm);}
.rank-head{display:flex;align-items:center;gap:8px;margin-bottom:10px;padding-bottom:10px;border-bottom:1px solid var(--line);}
.rank-icon{font-size:18px;}
.rank-title{font-size:15px;font-weight:700;color:var(--brand-d);}
.rank-list{list-style:none;margin:0;padding:0;}
.rank-item{display:flex;align-items:center;gap:10px;padding:8px 0;border-bottom:1px dashed var(--line);}
.rank-item:last-child{border-bottom:none;}
.rank-no{flex:0 0 auto;width:22px;height:22px;border-radius:6px;background:var(--bg2);color:var(--muted);font-size:12px;font-weight:700;display:flex;align-items:center;justify-content:center;}
.rank-item.top .rank-no{background:linear-gradient(135deg,var(--brand),var(--brand-d));color:#fff;}
.rank-link{flex:1;min-width:0;font-size:13.5px;color:var(--text);line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.rank-link:hover{color:var(--brand);}
.rank-val{flex:0 0 auto;font-size:12px;color:var(--muted);}
.rank-item.top .rank-val{color:var(--brand);font-weight:600;}

/* ---------------- 文章详情页点赞 ---------------- */
.like-zone{display:flex;align-items:center;gap:14px;justify-content:center;margin:4px auto 6px;max-width:760px;padding:14px 12px;}
.like-btn{display:inline-flex;align-items:center;gap:8px;background:var(--brand-light);border:1px solid var(--brand-soft);color:var(--brand-d);font-size:15px;font-weight:600;padding:10px 22px;border-radius:24px;cursor:pointer;transition:transform .15s,box-shadow .15s,background .15s;font-family:inherit;}
.like-btn:hover{box-shadow:0 4px 12px rgba(59,110,240,.18);transform:translateY(-1px);}
.like-btn:active{transform:scale(.97);}
.like-btn:disabled{opacity:.8;cursor:default;}
.like-btn.active{background:linear-gradient(135deg,#ff6b6b,#e03131);border-color:#e03131;color:#fff;}
.like-btn .like-ico{font-size:18px;line-height:1;}
.like-btn .like-num{font-variant-numeric:tabular-nums;font-weight:700;}
.like-btn.pop{animation:likePop .3s ease;}
@keyframes likePop{0%{transform:scale(1);}40%{transform:scale(1.12);}100%{transform:scale(1);}}
.like-hint{font-size:12px;color:var(--muted);}

/* ==================== 列表式分类（首页 / 分类页通用） ==================== */
.home-cats-head{display:flex;align-items:center;gap:10px;margin:18px 0 12px;padding-left:12px;position:relative;font-size:17px;font-weight:700;color:var(--text);}
.home-cats-head::before{content:'';position:absolute;left:0;top:50%;transform:translateY(-50%);width:4px;height:18px;background:linear-gradient(180deg,var(--brand),var(--accent));border-radius:3px;}

/* 分组树：每个顶级栏目独立配色，同级同色、分级缩进明显 */
/* PC / 平板多列网格排布，避免单列右侧大片空白 */
.cat-tree{display:grid;grid-template-columns:1fr;gap:14px;align-items:start;margin-bottom:8px;}
@media (min-width:560px){.cat-tree{grid-template-columns:repeat(2,1fr);}}
@media (min-width:900px){.cat-tree{grid-template-columns:repeat(3,1fr);gap:16px;}}
.cat-group{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:6px;overflow:hidden;}
.cat-group>.cat-node.level0{background:color-mix(in srgb,var(--g) 9%, #fff);margin-bottom:2px;}
.cat-node{display:flex;align-items:center;gap:10px;padding:11px 12px;border-radius:10px;text-decoration:none;color:var(--text);transition:background .15s,box-shadow .15s;position:relative;}
.cat-node:hover,.cat-node:active{background:color-mix(in srgb,var(--g) 16%, #fff);}
.cat-node.active{background:color-mix(in srgb,var(--g) 22%, #fff);box-shadow:inset 0 0 0 1.5px var(--g);}
.cat-node.level0 .cat-name{font-size:16px;font-weight:800;}
.cat-node.level1 .cat-name{font-size:14px;font-weight:600;}
.cat-node.level2 .cat-name{font-size:13px;font-weight:500;color:var(--text2);}
.cat-dot{width:11px;height:11px;border-radius:50%;background:var(--g);box-shadow:0 0 0 3px color-mix(in srgb,var(--g) 22%, #fff);flex:0 0 auto;}
.cat-dot-sm{width:7px;height:7px;border-radius:50%;background:var(--g);flex:0 0 auto;}
.cat-ico{font-size:18px;flex:0 0 auto;width:24px;text-align:center;}
.cat-name{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.cat-count{flex:0 0 auto;font-size:12px;line-height:1;color:var(--muted);background:color-mix(in srgb,var(--g) 13%, #fff);padding:3px 8px;border-radius:999px;min-width:22px;text-align:center;}
.cat-arrow{flex:0 0 auto;color:var(--muted);font-size:18px;}
/* 二级容器：响应式 2~3 列网格铺开（一级标题整行在上） */
.cat-group>.cat-children{display:grid;grid-template-columns:1fr;gap:10px;margin:8px 10px 8px;align-items:start;}
@media (min-width:560px){.cat-group>.cat-children{grid-template-columns:repeat(2,1fr);}}
@media (min-width:900px){.cat-group>.cat-children{grid-template-columns:repeat(3,1fr);}}
/* 二级 branch：标题在上，三级标签在下一行换行流 */
.cat-branch{display:flex;flex-direction:column;gap:6px;}
.cat-branch>.cat-children{display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0;border-left:none;}
/* 三级 chip：紧凑标签，换行排列在所属二级下方 */
.cat-node.level2{display:inline-flex;align-items:center;gap:5px;background:color-mix(in srgb,var(--g) 12%, #fff);border:1px solid color-mix(in srgb,var(--g) 22%, #fff);border-radius:999px;padding:4px 11px;font-size:12px;font-weight:500;color:var(--text2);white-space:nowrap;}
.cat-node.level2:hover{background:color-mix(in srgb,var(--g) 20%, #fff);}
.cat-node.level2 .cat-dot,.cat-node.level2 .cat-ico,.cat-node.level2 .cat-arrow,.cat-node.level2 .cat-count{display:none;}

/* ---------------- 文章分享栏 ---------------- */
.share-bar{display:flex;align-items:center;flex-wrap:wrap;gap:8px;background:var(--card);border-radius:14px;padding:12px 14px;margin:0 auto 16px;box-shadow:0 2px 8px rgba(36,81,201,.06);max-width:760px;}
.share-label{font-size:13px;color:var(--muted);margin-right:2px;}
.share-btn{border:1px solid var(--line);background:#fff;color:var(--text);font-size:13px;padding:7px 13px;border-radius:18px;cursor:pointer;transition:.15s;}
.share-btn:active{transform:scale(.96);}
.share-btn:hover{border-color:var(--brand);color:var(--brand);}

/* ---------------- 评论区 ---------------- */
.comments{max-width:760px;margin:0 auto;padding:16px 16px 40px;border-top:1px solid var(--line);}
.cmt-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px;}
.cmt-title{font-size:16px;font-weight:700;color:var(--text);}
.cmt-title span{color:var(--brand);}
.cmt-tabs{display:flex;gap:6px;}
.cmt-tab{font-size:13px;color:var(--muted);padding:5px 12px;border-radius:14px;background:var(--bg2);cursor:pointer;}
.cmt-tab.active{background:var(--brand);color:#fff;font-weight:600;}
.cmt-list{display:flex;flex-direction:column;gap:14px;margin-bottom:16px;}
.cmt-item{display:flex;gap:10px;}
.cmt-ava{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand-d));color:#fff;display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:700;flex-shrink:0;}
.cmt-body{flex:1;min-width:0;}
.cmt-name{font-size:13px;font-weight:600;color:var(--text);margin-bottom:3px;display:flex;align-items:center;gap:6px;}
.cmt-feat{font-size:11px;color:#fff;background:linear-gradient(135deg,#f59e0b,#d97706);padding:1px 7px;border-radius:8px;font-weight:500;}
.cmt-text{font-size:14px;line-height:1.6;color:#2c3038;word-break:break-word;}
.cmt-meta{font-size:11px;color:var(--muted);margin-top:4px;}
.cmt-empty{text-align:center;color:var(--muted);font-size:13px;padding:20px;}
.cmt-form{display:flex;flex-direction:column;gap:8px;background:var(--bg2);border:1px solid var(--line);border-radius:12px;padding:12px;}
.cmt-nick{height:36px;border:1px solid var(--line);border-radius:8px;padding:0 12px;font-size:13px;outline:none;background:#fff;}
.cmt-input{border:1px solid var(--line);border-radius:8px;padding:10px 12px;font-size:14px;outline:none;font-family:inherit;min-height:64px;resize:vertical;background:#fff;}
.cmt-nick:focus,.cmt-input:focus{border-color:var(--brand);}
.cmt-submit{height:40px;border:none;border-radius:8px;background:var(--brand);color:#fff;font-size:14px;font-weight:600;cursor:pointer;}
.cmt-submit:disabled{opacity:.6;}
.cmt-tip{font-size:12px;color:var(--muted);text-align:center;margin-top:10px;}

/* ---------------- 分享弹层补充 ---------------- */
.promo-hint{font-size:12px;color:var(--muted);margin-top:10px;text-align:left;line-height:1.6;}
.share-actions{margin-top:12px;}
.btn-share-native{width:100%;height:42px;border:1px solid var(--brand);border-radius:8px;background:#fff;color:var(--brand);font-size:14px;font-weight:600;cursor:pointer;}



/* ---------------- 骨架屏加载动画 ---------------- */
.skeleton-block { background: linear-gradient(90deg, #eef0f3 25%, #f6f8fb 50%, #eef0f3 75%); background-size: 200% 100%; animation: shimmer 1.5s infinite; border-radius: 12px; }
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }
.skeleton-gate { display:grid; grid-template-columns:repeat(3,1fr); gap:12px; margin-bottom:18px; }
.skeleton-gate > div { height:80px; border-radius:16px; }
.skeleton-row { height:18px; margin-bottom:10px; width:60%; }
.skeleton-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(112px,1fr)); gap:12px; margin-bottom:20px; }
.skeleton-grid > div { height:140px; border-radius:14px; }