/* =========================================================
   台前幕后百科 · 独立样式（仿 baike.so.com，主蓝 #009ad6）
   ========================================================= */
:root{
  --bk:#009ad6; --bk-h:#0086bb; --bk-d:#006f99;
  --bk-l:#7fd0ec; --bk-bg:#e6f6fb; --bk-bg2:#f0f9fc;
  --ink:#1f2d36; --sub:#5b6470; --mut:#93a0ad; --line:#e8edf0;
  --red:#ff4d4f;
}
.bk-body{background:#f4f6f8;color:var(--ink);font-family:"PingFang SC","Microsoft YaHei",sans-serif;}
.bk-wrap{max-width:1200px;margin:0 auto;padding:0 20px;box-sizing:border-box;}
a{color:inherit;text-decoration:none;}

/* ---------- 独立顶部：品牌 + 搜索 ---------- */
.bk-topbar{background:#fff;border-bottom:1px solid var(--line);}
.bk-top-inner{display:flex;align-items:center;gap:22px;height:74px;}
.bk-brand{display:flex;align-items:center;gap:11px;flex-shrink:0;}
.bk-brand .bm{width:42px;height:42px;border-radius:11px;background:linear-gradient(135deg,#2fb3e0,#006f99);color:#fff;font-size:23px;font-weight:800;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 12px rgba(0,122,170,.28);}
.bk-brand .bt{line-height:1.15;}
.bk-brand .bt b{display:block;font-size:19px;font-weight:800;color:var(--ink);letter-spacing:1px;}
.bk-brand .bt span{font-size:11.5px;color:var(--mut);letter-spacing:2px;}

.bk-searchbar{flex:1;display:flex;align-items:stretch;max-width:620px;}
.bk-searchbar input{flex:1;height:44px;border:2px solid var(--bk);border-right:none;border-radius:22px 0 0 22px;padding:0 20px;font-size:14.5px;color:var(--ink);outline:none;background:#fff;}
.bk-searchbar input::placeholder{color:#aab4bd;}
.bk-btn-in{height:44px;padding:0 20px;background:var(--bk);color:#fff;font-size:15px;font-weight:700;border:none;cursor:pointer;white-space:nowrap;display:flex;align-items:center;}
.bk-btn-in:hover{background:var(--bk-h);}
.bk-btn-q{height:44px;padding:0 22px;margin-left:10px;background:#fff;color:var(--bk);font-size:15px;font-weight:700;border:2px solid var(--bk);border-radius:22px;cursor:pointer;white-space:nowrap;display:flex;align-items:center;}
.bk-btn-q:hover{background:var(--bk-bg2);}

.bk-top-right{display:flex;align-items:center;gap:16px;flex-shrink:0;margin-left:auto;}
.bk-top-right .lk{font-size:13.5px;color:var(--sub);}
.bk-top-right .lk:hover{color:var(--bk);}
.bk-login{padding:7px 18px;border-radius:8px;border:1.5px solid var(--bk);color:var(--bk);font-size:13.5px;font-weight:600;}
.bk-login:hover{background:var(--bk-bg2);}
.bk-reg{padding:8px 18px;border-radius:8px;background:var(--bk);color:#fff;font-size:13.5px;font-weight:600;}
.bk-reg:hover{background:var(--bk-h);}
.bk-user{position:relative;}
.bk-avatar{width:40px;height:40px;border-radius:50%;object-fit:cover;cursor:pointer;border:2px solid transparent;}
.bk-avatar:hover{border-color:var(--bk);}
.bk-udrop{display:none;position:absolute;top:50px;right:0;width:198px;background:#fff;border-radius:12px;box-shadow:0 14px 44px rgba(15,40,52,.2);overflow:hidden;z-index:1001;}
.bk-user:hover .bk-udrop{display:block;}
.bk-user::after{content:'';position:absolute;left:-12px;right:-12px;top:38px;height:16px;}
.bk-udrop-h{background:linear-gradient(135deg,#2fb3e0,#006f99);padding:14px 18px;}
.bk-udrop-h .n{color:#fff;font-size:15px;font-weight:700;}
.bk-udrop-h .s{color:#cfeaf5;font-size:11.5px;margin-top:2px;}
.bk-udrop a{display:flex;align-items:center;gap:11px;padding:11px 18px;font-size:13.5px;color:#3c434e;border-bottom:1px solid #f3f5f7;}
.bk-udrop a:hover{background:var(--bk-bg2);color:var(--bk);}
.bk-udrop a .i{width:18px;text-align:center;color:#a6aeb8;}

/* ---------- 蓝色子导航 ---------- */
.bk-subnav{background:linear-gradient(90deg,#0086bb,#009ad6);box-shadow:0 2px 8px rgba(0,110,150,.22);position:sticky;top:0;z-index:900;}
.bk-sub-inner{display:flex;align-items:center;height:50px;gap:4px;}
.bk-sub-inner a{padding:9px 22px;font-size:15px;color:#dff4fb;border-radius:8px;white-space:nowrap;position:relative;}
.bk-sub-inner a:hover{color:#fff;background:rgba(255,255,255,.12);}
.bk-sub-inner a.active{color:#fff;font-weight:700;background:rgba(255,255,255,.18);}
.bk-sub-inner .sp{flex:1;}
.bk-sub-create{background:#fff;color:var(--bk)!important;font-weight:700;}
.bk-sub-create:hover{background:var(--bk-bg2)!important;}

/* ---------- 首页 Hero ---------- */
.bk-hero{margin-top:22px;border-radius:16px;overflow:hidden;position:relative;background:linear-gradient(115deg,#0a5f86 0%,#009ad6 58%,#2fb3e0 100%);color:#fff;padding:40px 44px;display:flex;align-items:center;gap:30px;}
.bk-hero::after{content:'';position:absolute;right:-60px;top:-60px;width:300px;height:300px;border-radius:50%;background:radial-gradient(circle,rgba(255,255,255,.18),transparent 70%);}
.bk-hero-l{flex:1;position:relative;z-index:2;}
.bk-hero h1{font-size:34px;font-weight:800;letter-spacing:2px;margin:0 0 12px;}
.bk-hero p{font-size:15px;line-height:1.8;color:#e3f5fc;margin:0 0 22px;max-width:560px;}
.bk-counters{display:flex;gap:34px;}
.bk-counter b{display:block;font-size:28px;font-weight:800;line-height:1;}
.bk-counter span{font-size:12.5px;color:#cdebf7;margin-top:7px;display:block;letter-spacing:1px;}
.bk-hero-r{flex-shrink:0;position:relative;z-index:2;font-size:120px;line-height:1;filter:drop-shadow(0 10px 22px rgba(0,40,60,.3));}

/* ---------- 首页主布局 ---------- */
.bk-layout{display:grid;grid-template-columns:1fr 300px;gap:24px;margin-top:26px;align-items:start;}
.bk-mod-title{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:800;margin:0 0 16px;}
.bk-mod-title::before{content:'';width:5px;height:19px;border-radius:3px;background:var(--bk);}
.bk-mod-title .more{margin-left:auto;font-size:13px;font-weight:500;color:var(--mut);}
.bk-mod-title .more:hover{color:var(--bk);}

/* 推荐词条卡片 */
.bk-rec-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;}
.bk-rec-card{background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;display:flex;transition:.2s;}
.bk-rec-card:hover{box-shadow:0 10px 26px rgba(20,70,90,.12);transform:translateY(-2px);border-color:#cfe9f3;}
.bk-rec-cover{width:88px;height:88px;flex-shrink:0;background:linear-gradient(135deg,#cdeef9,#9fd6ee);color:var(--bk-d);font-size:30px;font-weight:800;display:flex;align-items:center;justify-content:center;overflow:hidden;}
.bk-rec-cover img{width:100%;height:100%;object-fit:cover;}
.bk-rec-body{padding:11px 13px;min-width:0;flex:1;}
.bk-rec-body h4{font-size:14.5px;font-weight:700;margin:0 0 5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.bk-rec-body p{font-size:12px;color:var(--mut);line-height:1.55;margin:0;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.bk-rec-body .mv{font-size:11px;color:#b3bcc5;margin-top:6px;}

/* 侧栏 */
.bk-side-box{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 18px;margin-bottom:18px;}
.bk-side-box h3{font-size:15px;font-weight:800;margin:0 0 13px;display:flex;align-items:center;gap:8px;}
.bk-side-box h3 i{color:var(--bk);}
.bk-bulletin a{display:block;font-size:13px;color:var(--sub);line-height:1.5;padding:7px 0;border-bottom:1px dashed #eef1f4;}
.bk-bulletin a:last-child{border-bottom:none;}
.bk-bulletin a:hover{color:var(--bk);}
.bk-hottags{display:flex;flex-wrap:wrap;gap:8px;}
.bk-hottags a{font-size:12.5px;padding:5px 11px;border-radius:6px;background:var(--bk-bg2);color:var(--bk-d);}
.bk-hottags a:nth-child(3n+1){background:#eafaf0;color:#1c9e63;}
.bk-hottags a:nth-child(3n+2){background:#fff3e8;color:#e07a2e;}
.bk-hottags a:hover{filter:brightness(.97);}

/* 分类网格 */
.bk-cat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:4px;}
.bk-cat-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 16px;display:flex;flex-direction:column;gap:9px;transition:.2s;}
.bk-cat-card:hover{border-color:var(--bk);box-shadow:0 8px 20px rgba(0,120,160,.12);transform:translateY(-2px);}
.bk-cat-ic{width:42px;height:42px;border-radius:10px;background:var(--bk-bg);color:var(--bk);font-size:20px;font-weight:800;display:flex;align-items:center;justify-content:center;}
.bk-cat-card h4{font-size:14.5px;font-weight:700;margin:0;}
.bk-cat-card span{font-size:12px;color:var(--mut);}

/* 最新词条（多列名单） */
.bk-latest-cols{display:grid;grid-template-columns:repeat(3,1fr);gap:0 26px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px 24px;}
.bk-latest-cols a{font-size:13.5px;color:var(--sub);padding:8px 0;display:flex;align-items:center;gap:8px;border-bottom:1px dashed #eef1f4;white-space:nowrap;overflow:hidden;}
.bk-latest-cols a i{color:var(--bk-l);font-size:11px;}
.bk-latest-cols a:hover{color:var(--bk);}

/* 排行榜 */
.bk-rank-list a{display:flex;align-items:center;gap:12px;padding:10px 0;border-bottom:1px solid #f1f4f6;}
.bk-rank-list a:last-child{border-bottom:none;}
.bk-rank-no{width:22px;height:22px;border-radius:6px;background:#eef1f4;color:#9aa3ac;font-size:12.5px;font-weight:800;display:flex;align-items:center;justify-content:center;flex-shrink:0;}
.bk-rank-list a:nth-child(1) .bk-rank-no,.bk-rank-list a:nth-child(2) .bk-rank-no,.bk-rank-list a:nth-child(3) .bk-rank-no{background:var(--red);color:#fff;}
.bk-rank-info{flex:1;min-width:0;}
.bk-rank-info h4{font-size:14px;margin:0;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.bk-rank-info span{font-size:11.5px;color:var(--mut);}
.bk-rank-views{font-size:12px;color:var(--mut);flex-shrink:0;}

/* 新手教程 */
.bk-tutorial{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:26px 24px;}
.bk-tut-step{display:flex;gap:13px;align-items:flex-start;}
.bk-tut-ic{width:40px;height:40px;border-radius:50%;background:var(--bk-bg2);color:var(--bk);display:flex;align-items:center;justify-content:center;font-size:17px;flex-shrink:0;}
.bk-tut-step h5{font-size:14px;font-weight:700;margin:0 0 4px;}
.bk-tut-step p{font-size:12px;color:var(--mut);line-height:1.5;margin:0;}

/* CTA */
.bk-cta{margin:28px 0 10px;border-radius:16px;background:linear-gradient(135deg,#f0f9fc,#e0f3fa);border:1px solid #cde9f4;padding:32px;text-align:center;}
.bk-cta h3{font-size:20px;font-weight:800;margin:0 0 8px;}
.bk-cta p{font-size:13.5px;color:var(--sub);margin:0 0 18px;}
.bk-btn-primary{display:inline-block;padding:11px 30px;border-radius:9px;background:var(--bk);color:#fff;font-size:15px;font-weight:700;}
.bk-btn-primary:hover{background:var(--bk-h);}

/* ---------- 详情页 ---------- */
.bk-entry-hero{position:relative;border-radius:0;margin:0;color:#fff;overflow:hidden;}
.bk-entry-hero .eh-bg{position:absolute;inset:0;background-size:cover;background-position:center;}
.bk-entry-hero .eh-mask{position:absolute;inset:0;background:linear-gradient(120deg,rgba(6,70,96,.92),rgba(0,130,180,.78));}
.bk-entry-hero .eh-inner{position:relative;z-index:2;padding:38px 0 30px;}
.bk-entry-hero h1{font-size:33px;font-weight:800;margin:0 0 10px;display:flex;align-items:center;gap:16px;flex-wrap:wrap;}
.bk-entry-hero .eh-sub{font-size:15px;color:#dff2f9;max-width:760px;line-height:1.7;margin:0;}
.bk-entry-hero .eh-actions{margin-top:18px;display:flex;gap:12px;}
.bk-eh-btn{padding:8px 18px;border-radius:8px;background:rgba(255,255,255,.16);color:#fff;font-size:13.5px;border:1px solid rgba(255,255,255,.3);}
.bk-eh-btn:hover{background:rgba(255,255,255,.28);}
.bk-eh-btn.solid{background:#fff;color:var(--bk);border-color:#fff;font-weight:700;}

.bk-crumb-bar{background:#fff;border-bottom:1px solid var(--line);font-size:13px;color:var(--mut);}
.bk-crumb-bar .bk-wrap{padding-top:11px;padding-bottom:11px;}
.bk-crumb-bar a{color:var(--sub);}
.bk-crumb-bar a:hover{color:var(--bk);}

.bk-detail-layout{display:grid;grid-template-columns:1fr 300px;gap:24px;margin:24px 0 10px;align-items:start;}
.bk-article{background:#fff;border:1px solid var(--line);border-radius:12px;padding:28px 32px;min-width:0;}

/* 概述正文（在信息框前） */
.bk-lead p{font-size:15px;line-height:1.95;color:#33424c;margin:0 0 14px;}

/* 信息框表 */
.bk-info-sec{margin:8px 0 24px;}
.bk-sec-h{display:flex;align-items:center;gap:11px;font-size:19px;font-weight:800;margin:0 0 15px;}
.bk-sec-h::before{content:'';width:6px;height:21px;border-radius:3px;background:var(--bk);}
.bk-info-table{width:100%;border-collapse:collapse;border:1px solid #e6ebef;border-radius:8px;overflow:hidden;}
.bk-info-table td{border:1px solid #e6ebef;padding:9px 14px;font-size:13.5px;}
.bk-info-table td.k{background:var(--bk-bg2);color:var(--bk-d);font-weight:700;width:14%;white-space:nowrap;}
.bk-info-table td.v{width:36%;color:#33424c;}
/* 四列信息框（k v k v，自动两两成行） */
.bk-info-grid{display:grid;grid-template-columns:128px 1fr 128px 1fr;border:1px solid #e6ebef;border-radius:8px;overflow:hidden;}
.bk-info-grid .k{background:var(--bk-bg2);color:var(--bk-d);font-weight:700;padding:10px 14px;border:1px solid #e6ebef;font-size:13.5px;display:flex;align-items:center;white-space:nowrap;}
.bk-info-grid .v{padding:10px 14px;border:1px solid #e6ebef;color:#33424c;font-size:13.5px;display:flex;align-items:center;line-height:1.5;}

/* 目录 */
.bk-toc-box{background:var(--bk-bg2);border:1px solid #d3edf6;border-radius:10px;padding:18px 22px;margin-bottom:28px;display:flex;gap:22px;}
.bk-toc-label{flex-shrink:0;display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--bk-d);font-weight:800;font-size:15px;width:52px;border-right:1px solid #c4e4f0;padding-right:18px;}
.bk-toc-label i{font-size:22px;margin-bottom:5px;}
.bk-toc-grid{flex:1;display:grid;grid-template-columns:repeat(3,1fr);gap:4px 18px;}
.bk-toc-grid a{font-size:13.5px;color:#3a5563;padding:5px 0;}
.bk-toc-grid a b{color:var(--bk);margin-right:7px;}
.bk-toc-grid a:hover{color:var(--bk);}

/* 章节 */
.bk-section{margin-bottom:30px;}
.bk-section-h{display:flex;align-items:center;gap:11px;margin:0 0 14px;}
.bk-section-h::before{content:'';width:6px;height:21px;border-radius:3px;background:var(--bk);}
.bk-section-h h2{font-size:19px;font-weight:800;margin:0;}
.bk-section-h .edit{margin-left:auto;font-size:12.5px;color:var(--mut);}
.bk-section-h .edit:hover{color:var(--bk);}
.bk-section p{font-size:15px;line-height:1.95;color:#33424c;margin:0 0 13px;}
.bk-fig{float:right;width:300px;margin:4px 0 16px 22px;background:#f6f8fa;border:1px solid var(--line);border-radius:10px;overflow:hidden;}
.bk-fig img{width:100%;display:block;}
.bk-fig figcaption{font-size:12px;color:var(--mut);text-align:center;padding:8px;}
.bk-article-foot{clear:both;margin-top:34px;padding-top:20px;border-top:1px solid var(--line);display:flex;gap:12px;flex-wrap:wrap;align-items:center;}
.bk-article-foot span{font-size:13px;color:var(--mut);}
.bk-sm-btn{padding:7px 16px;border-radius:8px;border:1px solid var(--line);color:var(--sub);font-size:13px;}
.bk-sm-btn:hover{border-color:var(--bk);color:var(--bk);}
.bk-sm-btn.primary{background:var(--bk);color:#fff;border-color:var(--bk);}

/* 详情侧栏 */
.bk-side-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 20px;margin-bottom:18px;}
.bk-side-card h3{font-size:15px;font-weight:800;margin:0 0 14px;display:flex;align-items:center;gap:8px;}
.bk-side-card h3::before{content:'';width:4px;height:15px;border-radius:2px;background:var(--bk);}
.bk-stat-row{display:flex;justify-content:space-between;font-size:13px;color:var(--sub);padding:7px 0;border-bottom:1px dashed #eef1f4;}
.bk-stat-row b{color:var(--ink);font-weight:700;}
.bk-side-list a{display:block;font-size:13px;color:var(--sub);padding:7px 0;border-bottom:1px dashed #eef1f4;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.bk-side-list a:hover{color:var(--bk);}

/* ---------- 列表页 ---------- */
.bk-list-head{background:#fff;border:1px solid var(--line);border-radius:12px;padding:24px 28px;margin:24px 0 18px;}
.bk-list-head h1{font-size:22px;font-weight:800;margin:0 0 16px;}
.bk-list-head h1 em{color:var(--bk);font-style:normal;}
.bk-list-search{display:flex;max-width:560px;}
.bk-list-search input{flex:1;height:40px;border:1.5px solid var(--line);border-radius:20px 0 0 20px;padding:0 18px;font-size:14px;outline:none;}
.bk-list-search input:focus{border-color:var(--bk);}
.bk-list-search button{height:40px;padding:0 22px;background:var(--bk);color:#fff;border:none;border-radius:0 20px 20px 0;font-size:14px;cursor:pointer;}
.bk-list-count{font-size:13px;color:var(--mut);margin-top:13px;}
.bk-list-count b{color:var(--bk);}
.bk-result{display:block;background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px 26px;margin-bottom:14px;transition:.2s;}
.bk-result:hover{border-color:var(--bk);box-shadow:0 8px 22px rgba(0,120,160,.1);}
.bk-result h3{font-size:16.5px;font-weight:700;margin:0 0 8px;color:var(--bk-d);}
.bk-result:hover h3{color:var(--bk);}
.bk-result p{font-size:13.5px;color:var(--sub);line-height:1.7;margin:0 0 10px;}
.bk-result-meta{display:flex;gap:20px;font-size:12px;color:var(--mut);}
.bk-pager{margin:22px 0;text-align:center;}
.bk-pager a,.bk-pager span{display:inline-block;min-width:34px;height:34px;line-height:34px;padding:0 8px;margin:0 4px;border-radius:8px;border:1px solid var(--line);font-size:13px;color:var(--sub);}
.bk-pager .cur{background:var(--bk);color:#fff;border-color:var(--bk);}
.bk-pager a:hover{border-color:var(--bk);color:var(--bk);}
.bk-empty{background:#fff;border:1px solid var(--line);border-radius:12px;padding:48px 30px;text-align:center;color:var(--sub);}
.bk-empty .ei{font-size:54px;color:#c3cfd8;margin-bottom:14px;}
.bk-empty h4{font-size:16px;margin:0 0 8px;color:var(--ink);}
.bk-empty p{font-size:13px;margin:0 0 20px;}

/* ---------- 编辑页 ---------- */
.bk-edit-layout{display:grid;grid-template-columns:1fr 300px;gap:24px;margin:24px 0;align-items:start;}
.bk-edit-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:28px 32px;}
.bk-field{margin-bottom:20px;}
.bk-field label{display:block;font-size:14px;font-weight:700;margin-bottom:8px;color:var(--ink);}
.bk-field label .req{color:var(--red);}
.bk-input,.bk-select{width:100%;height:42px;border:1.5px solid var(--line);border-radius:8px;padding:0 14px;font-size:14px;box-sizing:border-box;outline:none;color:var(--ink);background:#fff;}
.bk-input:focus,.bk-select:focus,.bk-textarea:focus{border-color:var(--bk);box-shadow:0 0 0 3px rgba(0,154,214,.1);}
.bk-textarea{width:100%;border:1.5px solid var(--line);border-radius:8px;padding:12px 14px;font-size:14px;box-sizing:border-box;outline:none;line-height:1.7;resize:vertical;font-family:inherit;color:var(--ink);}
.bk-grid2{display:grid;grid-template-columns:1fr 1fr;gap:18px;}
.bk-hint{font-size:12.5px;color:var(--mut);margin-top:7px;line-height:1.6;}
.bk-edit-foot{display:flex;gap:14px;margin-top:8px;}
.bk-edit-foot .bk-btn-primary{border:none;cursor:pointer;font-family:inherit;padding:12px 34px;font-size:15px;}
.bk-edit-foot .cancel{padding:12px 26px;border-radius:9px;border:1.5px solid var(--line);color:var(--sub);font-size:15px;}
.bk-edit-foot .cancel:hover{border-color:var(--bk);color:var(--bk);}
.bk-help-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 20px;margin-bottom:18px;}
.bk-help-card h3{font-size:15px;font-weight:800;margin:0 0 12px;}
.bk-help-card ul{margin:0;padding-left:18px;}
.bk-help-card li{font-size:13px;color:var(--sub);line-height:1.8;}
.bk-help-card p{font-size:13px;color:var(--sub);line-height:1.7;margin:0 0 8px;}
.bk-help-code{background:var(--bk-bg2);border:1px solid #d3edf6;border-radius:8px;padding:11px 14px;font-size:12.5px;color:var(--bk-d);line-height:1.8;font-family:Consolas,monospace;margin:8px 0;}

/* ---------- 历史版本 ---------- */
.bk-history-head{background:#fff;border:1px solid var(--line);border-radius:12px;padding:22px 28px;margin:24px 0 18px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;}
.bk-history-head h1{font-size:21px;font-weight:800;margin:0;}
.bk-history-head .acts{display:flex;gap:10px;}
.bk-history-item{display:flex;gap:16px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 24px;margin-bottom:14px;}
.bk-history-dot{flex-shrink:0;width:52px;height:52px;border-radius:50%;background:var(--bk-bg);color:var(--bk-d);font-size:13px;font-weight:800;display:flex;align-items:center;justify-content:center;}
.bk-history-info h4{font-size:15px;font-weight:700;margin:0 0 5px;}
.bk-history-info p{font-size:13px;color:var(--sub);margin:0 0 6px;line-height:1.6;}
.bk-history-time{font-size:12px;color:var(--mut);}

/* ---------- 页脚 ---------- */
.bk-footer{margin-top:40px;background:#fff;border-top:1px solid var(--line);}
.bk-footer-band{background:#fafbfc;border-bottom:1px solid #eef0f3;}
.bk-footer-inner{max-width:1200px;margin:0 auto;padding:32px 20px;display:grid;grid-template-columns:repeat(3,1fr) 150px;gap:24px;box-sizing:border-box;}
.bk-footer-col h5{font-size:15px;font-weight:800;color:var(--bk-d);margin:0 0 13px;}
.bk-footer-col a{display:block;padding:4px 0;font-size:13px;color:#6b7280;}
.bk-footer-col a:hover{color:var(--bk);}
.bk-footer-qr{display:flex;flex-direction:column;align-items:center;gap:8px;}
.bk-footer-qr img{width:116px;height:116px;border:1px solid var(--line);border-radius:8px;background:#fff;padding:4px;box-sizing:border-box;}
.bk-footer-qr span{font-size:11.5px;color:var(--mut);text-align:center;}
.bk-footer-copy{background:#f3f5f8;}
.bk-footer-copy-inner{max-width:1200px;margin:0 auto;padding:14px 20px;display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;box-sizing:border-box;}
.bk-footer-copy .cl{display:flex;gap:16px;flex-wrap:wrap;}
.bk-footer-copy .cl a{font-size:12px;color:#8a929e;}
.bk-footer-copy .cr{font-size:12px;color:#9aa1ac;}

/* =========================================================
   v2 首页（1:1 复刻 baike.so 版式，主蓝）
   ========================================================= */
/* ---- 全站模块顶导航 ---- */
.bk-gnav{background:#f3f5f8;border-bottom:1px solid var(--line);}
.bk-gnav-inner{display:flex;align-items:center;height:38px;gap:2px;}
.bk-gnav a{font-size:13px;color:var(--sub);padding:6px 10px;border-radius:6px;white-space:nowrap;}
.bk-gnav a:hover{background:#e7eaef;color:var(--ink);}
.bk-gnav a.cur{background:var(--bk);color:#fff;font-weight:600;}
.bk-gnav-sp{flex:1;}
.bk-gnav-back{color:var(--mut);}

/* ---- Hero2 ---- */
.bk-hero2{background:#eef1f4;border-bottom:1px solid var(--line);}
.bk-hero2-inner{display:flex;align-items:center;gap:30px;padding-top:32px;padding-bottom:32px;}
.bk-hero2-l{flex:1;min-width:0;}
.bk-hero2-title{display:inline-block;background:#2b3a52;color:#fff;font-size:29px;font-weight:800;letter-spacing:2px;padding:12px 22px;border-radius:6px;}
.bk-hero2-sub{margin-top:15px;font-size:15.5px;color:#e08a2e;font-weight:600;}
.bk-hero2-cum{margin-top:18px;display:flex;align-items:center;gap:6px;flex-wrap:wrap;}
.bk-hero2-cum .tag{font-size:13px;color:var(--sub);margin-right:6px;}
.bk-hero2-cum .num{display:inline-flex;align-items:center;justify-content:center;width:33px;height:41px;background:#2b3a52;color:#7fd0ec;font-size:20px;font-weight:800;border-radius:5px;}
.bk-hero2-cum .ci{font-size:14px;color:var(--sub);margin-left:4px;}
.bk-hero2-r{flex-shrink:0;width:350px;}
.bk-hero2-svg{width:350px;height:auto;display:block;}

/* ---- Main2 ---- */
.bk-main2{display:grid;grid-template-columns:1fr 300px;gap:24px;margin:26px 0 10px;align-items:start;}

/* 大家在关注 */
.bk-focus{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px 22px 14px;}
.bk-focus-h{font-size:17px;font-weight:800;margin:0 0 14px;}
.bk-focus-viewport{position:relative;height:168px;}
.bk-focus-slide{position:absolute;inset:0;display:flex;gap:18px;opacity:0;pointer-events:none;transition:opacity .4s;}
.bk-focus-slide.on{opacity:1;pointer-events:auto;}
.bk-focus-cover{width:168px;height:168px;flex-shrink:0;border-radius:10px;overflow:hidden;background:linear-gradient(135deg,#cdeef9,#9fd6ee);}
.bk-focus-cover img{width:100%;height:100%;object-fit:cover;}
.bk-focus-cover .ph{display:flex;width:100%;height:100%;align-items:center;justify-content:center;font-size:52px;font-weight:800;color:var(--bk-d);}
.bk-focus-tx{min-width:0;flex:1;}
.bk-focus-tx h4{font-size:19px;font-weight:800;margin:5px 0 10px;color:var(--ink);}
.bk-focus-tx p{font-size:13.5px;line-height:1.8;color:var(--sub);margin:0;display:-webkit-box;-webkit-line-clamp:5;-webkit-box-orient:vertical;overflow:hidden;}
.bk-focus-ctl{display:flex;align-items:center;justify-content:flex-end;gap:10px;margin-top:10px;}
.bk-focus-ctl .arr{width:28px;height:24px;border:1px solid var(--line);background:#fff;border-radius:5px;color:var(--sub);cursor:pointer;font-size:15px;line-height:1;}
.bk-focus-ctl .arr:hover{border-color:var(--bk);color:var(--bk);}
.bk-focus-ctl .dots i{display:inline-block;width:8px;height:8px;border-radius:50%;background:#d4dbe1;margin:0 3px;cursor:pointer;}
.bk-focus-ctl .dots i.on{background:var(--bk);}

/* 参与编辑条 */
.bk-reward-bar{display:flex;align-items:center;gap:10px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:15px 20px;margin-top:16px;}
.bk-reward-bar .t{font-size:17px;font-weight:800;color:var(--ink);}
.bk-reward-bar .d{font-size:13.5px;color:var(--sub);}
.bk-reward-bar .r{margin-left:auto;font-size:12.5px;color:var(--mut);}

/* 图文频道 */
.bk-tw{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 22px 0;margin-top:16px;}
.bk-tw-h{font-size:17px;font-weight:800;margin:0 0 12px;}
.bk-tw-master{display:none;}
.bk-tw-cols{display:grid;grid-template-columns:repeat(3,1fr);gap:0 30px;}
.bk-tw-col a{display:block;font-size:14px;color:var(--sub);padding:9px 0;border-bottom:1px dashed #eef1f4;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.bk-tw-col a:hover{color:var(--bk);}
.bk-tw-change{margin:12px -22px 0;background:var(--bk-bg2);color:var(--bk-d);text-align:center;font-size:13px;padding:10px;cursor:pointer;border-radius:0 0 12px 12px;}
.bk-tw-change:hover{background:#d7eff8;}

/* 编辑精选 */
.bk-feat{margin-top:28px;}
.bk-feat-h{display:flex;align-items:center;font-size:18px;font-weight:800;margin:0 0 16px;}
.bk-feat-h::before{content:'';width:5px;height:19px;border-radius:3px;background:var(--bk);margin-right:11px;}
.bk-feat-h .more{margin-left:auto;font-size:13px;font-weight:500;}
.bk-feat-h .more a{color:var(--mut);}
.bk-feat-h .more a:hover{color:var(--bk);}
.bk-feat-cards{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.bk-feat-card{display:flex;gap:14px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px;}
.bk-feat-card .img{width:118px;height:96px;flex-shrink:0;border-radius:9px;overflow:hidden;background:linear-gradient(135deg,#cdeef9,#9fd6ee);display:block;}
.bk-feat-card .img img{width:100%;height:100%;object-fit:cover;}
.bk-feat-card .img .ph{display:flex;width:100%;height:100%;align-items:center;justify-content:center;font-size:40px;font-weight:800;color:var(--bk-d);}
.bk-feat-card .tx{min-width:0;flex:1;}
.bk-feat-card .tx h4{font-size:15px;font-weight:800;margin:0 0 7px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.bk-feat-card .tx p{font-size:12.5px;line-height:1.65;color:var(--mut);margin:0 0 8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.bk-feat-card .viewall{font-size:12.5px;color:var(--bk);font-weight:600;}
.bk-feat-links{margin-top:16px;display:grid;grid-template-columns:1fr 1fr;gap:0 30px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 22px;}
.bk-feat-links a{font-size:13.5px;color:var(--sub);padding:8px 0;display:flex;gap:8px;white-space:nowrap;overflow:hidden;}
.bk-feat-links a i{color:var(--bk-l);}
.bk-feat-links a:hover{color:var(--bk);}

/* 分类网格2 */
.bk-sec-h .cnt{margin-left:auto;font-size:13px;font-weight:500;color:var(--mut);}
.bk-cat-grid2{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;}
.bk-cat-card2{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 16px;display:flex;flex-direction:column;gap:8px;transition:.2s;}
.bk-cat-card2:hover{border-color:var(--bk);transform:translateY(-2px);box-shadow:0 8px 20px rgba(0,120,160,.12);}
.bk-cat-card2 .ic{width:42px;height:42px;border-radius:10px;background:var(--bk-bg);color:var(--bk);font-size:20px;font-weight:800;display:flex;align-items:center;justify-content:center;}
.bk-cat-card2 .nm{font-size:14.5px;font-weight:700;}
.bk-cat-card2 .cn{font-size:12px;color:var(--mut);}

/* 侧栏2 */
.bk-side2{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 18px;margin-bottom:18px;}
.bk-side2 h3{font-size:15px;font-weight:800;margin:0 0 13px;}
.bk-bulletin2 a{display:block;font-size:13px;color:var(--sub);line-height:1.5;padding:8px 0;border-bottom:1px dashed #eef1f4;}
.bk-bulletin2 a:last-child{border-bottom:none;}
.bk-bulletin2 a:hover{color:var(--bk);}
.bk-hotpills{display:flex;flex-direction:column;gap:9px;}
.bk-hotpills .pill{font-size:13px;padding:8px 12px;border-radius:7px;line-height:1.3;}
.bk-hotpills .pill.a{background:var(--bk-bg2);color:var(--bk-d);}
.bk-hotpills .pill.b{background:#e6f6fb;color:var(--bk);}
.bk-hotpills .pill:hover{filter:brightness(.97);}

/* 新手教程2（卡片） */
.bk-tut2{background:#fff;border:1px solid var(--line);border-radius:12px;padding:26px 28px;margin-top:30px;}
.bk-tut2-h{font-size:18px;font-weight:800;margin:0 0 22px;color:var(--ink);}
.bk-tut2-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.bk-tut2-step{display:flex;gap:13px;align-items:flex-start;}
.bk-tut2-step .ic{width:44px;height:44px;border-radius:50%;background:var(--bk-bg2);color:var(--bk);display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0;}
.bk-tut2-step h5{font-size:14.5px;font-weight:700;margin:0 0 5px;}
.bk-tut2-step p{font-size:12.5px;color:var(--mut);line-height:1.5;margin:0;}

/* CTA2 */
.bk-cta2{margin:28px 0 12px;border-radius:16px;background:linear-gradient(135deg,#f0f9fc,#e0f3fa);border:1px solid #cde9f4;padding:34px;text-align:center;}
.bk-cta2 h3{font-size:20px;font-weight:800;margin:0 0 8px;}
.bk-cta2 p{font-size:13.5px;color:var(--sub);margin:0 0 18px;}
.bk-btn-primary2{display:inline-block;padding:11px 30px;border-radius:9px;background:var(--bk);color:#fff;font-size:15px;font-weight:700;}
.bk-btn-primary2:hover{background:var(--bk-h);}

@media (max-width:980px){
  .bk-main2{grid-template-columns:1fr;}
  .bk-cat-grid2,.bk-tut2-grid{grid-template-columns:repeat(2,1fr);}
  .bk-feat-cards{grid-template-columns:1fr;}
  .bk-hero2-r{display:none;}
}
@media (max-width:680px){
  .bk-tw-cols,.bk-feat-links{grid-template-columns:1fr;}
  .bk-focus-cover{width:120px;height:120px;}
  .bk-focus-viewport{height:150px;}
}

/* ---------- 响应式 ---------- */
@media (max-width:980px){
  .bk-layout,.bk-detail-layout,.bk-edit-layout{grid-template-columns:1fr;}
  .bk-cat-grid,.bk-tutorial{grid-template-columns:repeat(2,1fr);}
  .bk-rec-grid{grid-template-columns:1fr;}
  .bk-hero{flex-direction:column;text-align:left;}
  .bk-hero-r{display:none;}
  .bk-top-right .lk{display:none;}
  .bk-footer-inner{grid-template-columns:1fr 1fr;}
  .bk-footer-qr{grid-column:1/-1;}
  .bk-fig{float:none;width:100%;margin:0 0 16px;}
}
@media (max-width:680px){
  .bk-latest-cols{grid-template-columns:1fr;}
  .bk-toc-grid{grid-template-columns:1fr 1fr;}
  .bk-grid2{grid-template-columns:1fr;}
  .bk-searchbar{max-width:none;}
  .bk-btn-q{display:none;}
}