/* ============================================================
 * vip3mb00332 - 北京理工大学风格 PC 端样式
 * 深蓝主题 + 中央悬浮 logo + 右侧固定竖条 + 9 大板块
 * ============================================================ */

/* === 基础重置 === */
*,*::before,*::after{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font:14px/1.6 "Microsoft YaHei","PingFang SC","Hiragino Sans GB",sans-serif;color:#333;background:#fff;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none;transition:color .2s}
a:hover{color:#1d3a7a}
img{max-width:100%;display:block;border:0}
ul,ol{list-style:none;margin:0;padding:0}
h1,h2,h3,h4,h5,h6{margin:0;font-weight:700}
button{font-family:inherit;cursor:pointer}

.container{width:1320px;max-width:96%;margin:0 auto;position:relative}

/* === 顶栏极简 === */
.bit-topbar{background:#152c64;color:#cfd8ee;font-size:13px;line-height:42px;height:42px;border-bottom:1px solid rgba(255,255,255,.08)}
.bit-topbar .container{display:flex;justify-content:space-between;align-items:center}
.bit-topbar .left,.bit-topbar .right{display:flex;gap:24px;align-items:center}
.bit-topbar a{color:#cfd8ee;font-weight:500;letter-spacing:.5px;display:inline-flex;align-items:center}
.bit-topbar a:hover{color:#fff}
.bit-topbar .search-icon{width:32px;height:32px;border-radius:50%;border:1px solid rgba(255,255,255,.35);display:inline-flex;align-items:center;justify-content:center;cursor:pointer}
.bit-topbar .search-icon svg{fill:#fff;width:14px;height:14px}
.bit-topbar .search-icon:hover{background:#fff}
.bit-topbar .search-icon:hover svg{fill:#152c64}

/* === 搜索浮层 === */
.bit-search{position:fixed;top:42px;left:0;right:0;background:#1d3a7a;padding:0;height:0;overflow:hidden;transition:height .25s ease;z-index:120}
.bit-search.on{height:80px;padding:18px 0}
.bit-search form{display:flex;width:600px;max-width:90%;margin:0 auto;background:#fff;border-radius:4px;overflow:hidden}
.bit-search input{flex:1;border:0;padding:0 16px;font-size:14px;outline:none;height:44px}
.bit-search button{background:#1d3a7a;color:#fff;border:0;padding:0 28px;font-size:14px;font-weight:700;letter-spacing:2px}

/* === 主导航：中央悬浮 logo === */
.bit-navbar{background:#1d3a7a;height:74px;position:relative;z-index:30}
.bit-navbar .container{display:flex;align-items:center;justify-content:space-between;height:100%;padding:0 12px}
.bit-nav{display:flex;align-items:center;gap:0;flex:0 0 calc(50% - 90px);justify-content:space-around}
.bit-nav.right{justify-content:space-around}
.bit-nav li{position:relative}
.bit-nav a{display:block;color:#fff;font-size:17px;font-weight:600;letter-spacing:1px;padding:0 18px;line-height:74px;white-space:nowrap;transition:all .2s}
.bit-nav a:hover,.bit-nav li.active a{color:#fff5b8}
.bit-nav .more-dots{color:#fff;font-size:24px;letter-spacing:2px;padding:0 12px;line-height:74px;cursor:pointer}

/* 中央 logo 圆盾 */
.bit-logo-shield{position:absolute;left:50%;top:6px;transform:translateX(-50%);width:160px;height:138px;z-index:40;text-align:center;pointer-events:auto}
.bit-logo-shield .shield-bg{position:absolute;left:0;top:0;right:0;bottom:0;background:#1d3a7a;clip-path:polygon(50% 0,100% 0,100% 70%,50% 100%,0 70%,0 0);border-bottom:0}
.bit-logo-shield .logo-link{position:relative;display:inline-block;padding-top:14px;z-index:2}
.bit-logo-shield img{width:96px;height:96px;margin:0 auto;border-radius:50%;background:#fff;padding:6px;object-fit:contain}
.bit-logo-shield h1{position:absolute;left:-9999px;font-size:0}

/* === Banner 大图轮播 === */
.bit-slide{position:relative;width:100%;background:#0a1840}
.bit-slide .swiper-container{width:100%;height:560px}
.bit-slide .swiper-slide{background-position:center;background-size:cover;background-repeat:no-repeat;position:relative}
.bit-slide .swiper-slide a{display:block;width:100%;height:100%}
.bit-slide .swiper-slide img{width:100%;height:100%;object-fit:cover}
.bit-slide .swiper-pagination{bottom:24px}
.bit-slide .swiper-pagination-bullet{width:10px;height:10px;background:rgba(255,255,255,.5);opacity:1}
.bit-slide .swiper-pagination-bullet-active{background:#fff}
.bit-slide .arrow{position:absolute;top:50%;transform:translateY(-50%);width:48px;height:48px;border-radius:50%;background:rgba(0,0,0,.3);color:#fff;display:flex;align-items:center;justify-content:center;font-size:24px;cursor:pointer;z-index:5;border:1px solid rgba(255,255,255,.6);transition:background .2s}
.bit-slide .arrow:hover{background:rgba(255,255,255,.25)}
.bit-slide .arrow.prev{left:64px}
.bit-slide .arrow.next{right:140px}
.bit-slide .read-more{position:absolute;left:50%;bottom:0;transform:translateX(-50%);background:#9b1c1c;color:#fff;padding:18px 44px 26px;text-align:center;clip-path:polygon(0 0,100% 0,100% 70%,50% 100%,0 70%);min-width:160px;z-index:6}
.bit-slide .read-more strong{display:block;font-size:18px;letter-spacing:4px;margin-bottom:4px}
.bit-slide .read-more span{font-size:12px;opacity:.85}

/* === 右侧固定竖条 === */
.bit-rail{position:fixed;top:160px;right:0;width:90px;background:#1d3a7a;border-radius:6px 0 0 6px;z-index:90;box-shadow:-4px 4px 16px rgba(0,0,0,.18);padding-bottom:8px}
.bit-rail .rail-logo{width:64px;height:64px;background:#fff;border-radius:50%;margin:-28px auto 14px;padding:6px;box-shadow:0 2px 8px rgba(0,0,0,.15);display:flex;align-items:center;justify-content:center}
.bit-rail .rail-logo img{width:100%;height:100%;object-fit:contain;border-radius:50%}
.bit-rail ul{padding:0 6px}
.bit-rail li{margin-bottom:6px}
.bit-rail a{display:block;text-align:center;color:#fff;background:#2a4d96;padding:11px 0;font-size:13px;font-weight:500;letter-spacing:1px;border-radius:3px;transition:all .2s}
.bit-rail a:hover,.bit-rail li.on a{background:#4a7fd6;color:#fff}
.bit-rail .rail-toggle{width:28px;height:28px;border-radius:50%;background:#fff;color:#1d3a7a;display:flex;align-items:center;justify-content:center;margin:8px auto 0;cursor:pointer;font-size:18px;box-shadow:0 1px 4px rgba(0,0,0,.15)}

/* === 通用区块 === */
.bit-section{padding:60px 0;position:relative}
.bit-section.cream{background:#f3eee2}
.bit-section.dark{background:#0c1f4a;color:#fff;background-size:cover;background-position:center}
.bit-section.deep-blue{background:linear-gradient(180deg,#1c3470 0%,#15275a 100%);color:#fff}
.bit-sec-head{text-align:center;margin-bottom:38px;position:relative}
.bit-sec-head.right-align{text-align:right;padding-right:0}
.bit-sec-head h2{font-size:30px;color:#1d3a7a;letter-spacing:6px;display:inline-block;padding:0 30px;position:relative}
.bit-sec-head.right-align h2{padding:0}
.bit-sec-head.dark h2{color:#fff}
.bit-sec-head h2::before,.bit-sec-head h2::after{content:'';position:absolute;top:50%;width:80px;height:1px;background:#7a8eb8}
.bit-sec-head h2::before{right:100%;margin-right:8px}
.bit-sec-head h2::after{left:100%;margin-left:8px}
.bit-sec-head.right-align h2::before{display:none}
.bit-sec-head.right-align h2::after{display:none}
.bit-sec-head em{display:block;font-style:normal;font-size:13px;color:#7a8eb8;letter-spacing:2px;margin-top:8px}
.bit-sec-head .more{position:absolute;right:0;top:14px;color:#1d3a7a;font-size:13px}
.bit-sec-head.dark em{color:#a8b8d8}

/* === 焦点关注 - 左大图 + 右3小卡 === */
.bit-focus{display:grid;grid-template-columns:1.05fr 1fr;gap:24px}
.bit-focus .big{position:relative;border-radius:4px;overflow:hidden;box-shadow:0 6px 20px rgba(0,0,0,.18);background:#fff;color:#fff}
.bit-focus .big .pic{height:430px;background:#dfe5f0;overflow:hidden}
.bit-focus .big .pic img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.bit-focus .big:hover .pic img{transform:scale(1.04)}
.bit-focus .big .cap{background:#fff;color:#222;padding:20px 24px;border-bottom-left-radius:4px;border-bottom-right-radius:4px;position:relative;margin-top:-50px;margin-left:24px;margin-right:24px;box-shadow:0 4px 14px rgba(0,0,0,.1)}
.bit-focus .big .cap h3{font-size:17px;line-height:1.5;color:#222;font-weight:600;margin-bottom:10px}
.bit-focus .big .cap .date{font-size:13px;color:#888;display:flex;align-items:center;gap:6px}
.bit-focus .right-list{display:flex;flex-direction:column;gap:18px}
.bit-focus .small{display:grid;grid-template-columns:170px 1fr;gap:14px;background:#fff;border-radius:3px;padding:14px;box-shadow:0 3px 12px rgba(0,0,0,.08);transition:transform .2s}
.bit-focus .small:hover{transform:translateY(-3px)}
.bit-focus .small .pic{width:170px;height:106px;background:#dfe5f0;border-radius:3px;overflow:hidden}
.bit-focus .small .pic img{width:100%;height:100%;object-fit:cover}
.bit-focus .small .info h4{font-size:15px;color:#222;line-height:1.5;font-weight:600;margin-bottom:14px;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden}
.bit-focus .small .info .date{font-size:12px;color:#888;display:flex;align-items:center;gap:5px}

/* === 北理新闻 - 8卡片 + 蓝色日期标签 === */
.bit-news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px 36px}
.bit-news-grid .news-card{position:relative;background:#fff;border-radius:3px;padding:60px 24px 26px;box-shadow:0 2px 10px rgba(0,0,0,.06);min-height:200px}
.bit-news-grid .news-card .badge{position:absolute;left:50%;transform:translateX(-50%);top:-2px;background:#2a4d96;color:#fff;text-align:center;padding:7px 14px;font-size:13px;line-height:1.2;border-radius:0 0 3px 3px;display:flex;align-items:center;gap:6px;white-space:nowrap;width:auto}
.bit-news-grid .news-card.first .badge{left:auto;right:24px;transform:none;top:-22px}
.bit-news-grid .news-card .badge .ic{display:inline-block}
.bit-news-grid .news-card .badge .d-line{display:flex;flex-direction:column;line-height:1.1;font-weight:600}
.bit-news-grid .news-card .badge .d-line span:first-child{font-size:14px}
.bit-news-grid .news-card .badge .d-line span:last-child{font-size:11px;opacity:.85}
.bit-news-grid .news-card h3{font-size:16px;color:#222;font-weight:600;line-height:1.55;margin-bottom:10px;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:3;overflow:hidden}
.bit-news-grid .news-card p{font-size:13px;color:#666;line-height:1.65;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:3;overflow:hidden}
.bit-news-grid .news-card:hover{transform:translateY(-3px);box-shadow:0 6px 18px rgba(0,0,0,.1);transition:all .25s}

/* 焦点关注变体（左大图 + 右3卡） - 复用 */

/* === 教学科研 - 4列论文封面 === */
.bit-research{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.bit-research .paper{background:#fff;padding:18px;box-shadow:0 2px 10px rgba(0,0,0,.08);border-radius:2px}
.bit-research .paper .pic{height:180px;background:#f4f4f4;margin-bottom:14px;overflow:hidden;display:flex;align-items:center;justify-content:center}
.bit-research .paper .pic img{max-width:100%;max-height:100%;object-fit:cover}
.bit-research .paper h4{font-size:15px;color:#222;line-height:1.55;margin-bottom:14px;font-weight:600;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden;min-height:48px}
.bit-research .paper .date{font-size:12px;color:#888;margin-bottom:10px;display:flex;align-items:center;gap:5px}
.bit-research .paper p{font-size:13px;color:#666;line-height:1.65;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:4;overflow:hidden}
.bit-research-arrows{display:flex;justify-content:flex-end;gap:14px;margin-top:24px}
.bit-research-arrows span{width:40px;height:40px;border-radius:50%;border:1px solid #1d3a7a;color:#1d3a7a;display:flex;align-items:center;justify-content:center;cursor:pointer}
.bit-research-arrows span:hover{background:#1d3a7a;color:#fff}

/* === 媒体北理 + 全媒体窗 双栏 === */
.bit-media-row{display:grid;grid-template-columns:1.05fr 1fr;gap:36px}
.bit-media-row .media-col h2{color:#fff}
.bit-media-row .media-col .col-head{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:24px;padding-bottom:8px;border-bottom:1px solid rgba(255,255,255,.15)}
.bit-media-row .media-col .col-head h2{font-size:26px;color:#fff;letter-spacing:4px}
.bit-media-row .media-col .col-head em{font-style:normal;font-size:12px;color:#a8b8d8;letter-spacing:1px}
.bit-media-list{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.bit-media-list .item{padding-top:14px;border-top:2px solid #5a8bd8}
.bit-media-list .item.green{border-color:#5fc26b}
.bit-media-list .item.red{border-color:#e53e3e}
.bit-media-list .item.yellow{border-color:#e6b450}
.bit-media-list .item .src{display:flex;align-items:center;justify-content:space-between;font-size:14px;color:#5a8bd8;margin-bottom:10px;font-weight:600}
.bit-media-list .item.green .src{color:#5fc26b}
.bit-media-list .item.red .src{color:#e53e3e}
.bit-media-list .item.yellow .src{color:#e6b450}
.bit-media-list .item .src .date{color:#cfd8ee;font-weight:400;font-size:12px}
.bit-media-list .item h4{color:#fff;font-size:15px;font-weight:600;line-height:1.55;margin-bottom:10px;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden}
.bit-media-list .item p{color:#cfd8ee;font-size:13px;line-height:1.6;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:5;overflow:hidden}

.bit-allmedia{position:relative}
.bit-allmedia .video{position:relative;border-radius:4px;overflow:hidden;background:#000;aspect-ratio:16/10}
.bit-allmedia .video img{width:100%;height:100%;object-fit:cover}
.bit-allmedia .video .play{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:64px;height:64px;border-radius:50%;background:rgba(255,255,255,.85);display:flex;align-items:center;justify-content:center;font-size:24px;color:#1d3a7a}
.bit-allmedia .video .date-stamp{position:absolute;left:0;bottom:0;background:rgba(0,0,0,.55);color:#fff;padding:10px 16px;font-size:13px}
.bit-allmedia .wechat{margin-top:20px;background:#fff;border-radius:4px;padding:16px 20px;display:grid;grid-template-columns:auto 1fr auto;gap:16px;align-items:center}
.bit-allmedia .wechat .ic{width:54px;height:54px;border-radius:50%;background:#7bb957;color:#fff;display:flex;align-items:center;justify-content:center;font-size:30px}
.bit-allmedia .wechat .ic::before{content:'\2709'}
.bit-allmedia .wechat .txt{color:#222;font-size:14px;line-height:1.5}
.bit-allmedia .wechat .txt h5{font-size:15px;font-weight:700;margin-bottom:4px}
.bit-allmedia .wechat .qr{width:64px;height:64px;background:#fff;padding:2px;border:1px solid #ddd}
.bit-allmedia .wechat .qr img{width:100%;height:100%}

/* === 数据北理 - 圆环 === */
.bit-stats{padding:80px 0;background:#0c1635 url("../images/star-bg.jpg") center/cover no-repeat;position:relative;color:#fff}
.bit-stats::before{content:'';position:absolute;inset:0;background:linear-gradient(180deg,rgba(12,22,53,.6) 0%,rgba(12,22,53,.85) 100%)}
.bit-stats .container{position:relative;z-index:2}
.bit-stats .stats-grid{display:flex;justify-content:center;align-items:center;flex-wrap:wrap;gap:18px;position:relative}
.bit-stats .stat-circle{width:160px;height:160px;border:1px solid rgba(255,255,255,.5);border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;background:rgba(255,255,255,.04)}
.bit-stats .stat-circle .n{font-size:38px;font-weight:700;line-height:1;letter-spacing:1px}
.bit-stats .stat-circle .lbl{font-size:13px;margin-top:8px;color:#cfd8ee}
.bit-stats .stat-circle.lg{width:200px;height:200px}
.bit-stats .stat-circle.lg .n{font-size:48px}
.bit-stats .stat-title{flex:0 0 100%;order:-1;text-align:center;margin-bottom:30px;position:static;transform:none}
.bit-stats .stat-title h2{font-size:30px;letter-spacing:4px;margin-bottom:8px;color:#fff}
.bit-stats .stat-title em{font-style:normal;font-size:13px;color:#a8b8d8}

/* === 北理专题 - 4个色块 === */
.bit-topics{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.bit-topics .topic{aspect-ratio:16/9;border-radius:3px;overflow:hidden;position:relative;background:#9b1c1c}
.bit-topics .topic img{width:100%;height:100%;object-fit:cover}
.bit-topics .topic .mask{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px;font-weight:700;text-align:center;padding:0 20px;background:rgba(0,0,0,.15)}

/* === 校务公开 双栏布局 === */
.bit-affair-row{display:grid;grid-template-columns:1fr 1.2fr;gap:60px;align-items:start}
.bit-affair-left .col-head{margin-bottom:30px}
.bit-affair-left .col-head h2{font-size:28px;color:#1d3a7a;letter-spacing:4px;text-align:center}
.bit-affair-left .col-head em{display:block;text-align:center;font-style:normal;font-size:13px;color:#888;margin-top:6px}
.bit-affair-list{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.bit-affair-list .item{background:#fff;border-radius:3px;padding:18px 22px;box-shadow:0 2px 8px rgba(0,0,0,.06)}
.bit-affair-list .item .h{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;padding-bottom:10px;border-bottom:2px solid #1d3a7a;width:75px}
.bit-affair-list .item .h h4{font-size:15px;color:#1d3a7a;font-weight:700}
.bit-affair-list .item .date{font-size:12px;color:#888;margin-bottom:8px;display:flex;align-items:center;gap:5px}
.bit-affair-list .item p{font-size:14px;color:#222;line-height:1.6;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden}
.bit-quick-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:20px;margin-top:10px}
.bit-quick-grid a{display:flex;flex-direction:column;align-items:center;justify-content:center;background:#fff;aspect-ratio:1;border-radius:3px;padding:12px;font-size:13px;color:#444;border:1px solid #f0eadb;transition:all .2s}
.bit-quick-grid a:hover{transform:translateY(-3px);box-shadow:0 6px 14px rgba(0,0,0,.08)}
.bit-quick-grid a .ic{width:48px;height:48px;border-radius:6px;border:1.5px solid currentColor;display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:600;margin-bottom:10px}
.bit-quick-grid a.c1{color:#5a8bd8}.bit-quick-grid a.c2{color:#3aa8e0}.bit-quick-grid a.c3{color:#e54d4d}.bit-quick-grid a.c4{color:#3aa8e0}.bit-quick-grid a.c5{color:#e54d4d}
.bit-quick-grid a.c6{color:#e6892b}.bit-quick-grid a.c7{color:#5a8bd8}.bit-quick-grid a.c8{color:#a3852e}.bit-quick-grid a.c9{color:#e6b450}.bit-quick-grid a.c10{color:#5fc26b}

/* === 底部宣传图墙 === */
.bit-promo-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:36px}
.bit-promo-strip .promo{aspect-ratio:16/9;border-radius:3px;overflow:hidden;position:relative;background:#9b1c1c}
.bit-promo-strip .promo img{width:100%;height:100%;object-fit:cover;opacity:.85}
.bit-promo-strip .promo span{position:absolute;left:14px;top:14px;background:#9b1c1c;color:#fff;font-size:14px;font-weight:600;padding:4px 12px;border-radius:1px;letter-spacing:1px}

/* === 友情链接 / 链接列 === */
.flinks{background:#1d3a7a;color:#cfd8ee;padding:0;border-top:0}
.flinks .container{display:grid;grid-template-columns:1.1fr 1fr 1fr;gap:48px;padding:48px 16px}
.flinks .col-links h4{color:#fff;font-size:14px;letter-spacing:2px;margin-bottom:16px;font-weight:600;padding-bottom:10px;border-bottom:1px solid rgba(255,255,255,.15)}
.flinks .col-links ul{display:flex;flex-wrap:wrap;gap:0}
.flinks .col-links li{flex:0 0 50%;line-height:2.2}
.flinks .col-links a{color:#cfd8ee;font-size:13px}
.flinks .col-links a:hover{color:#fff}
.flinks .col-logo{display:flex;align-items:center;justify-content:flex-end;flex-direction:column;gap:14px}
.flinks .col-logo .seal{width:120px;height:120px;border-radius:50%;background:#fff;padding:8px;display:flex;align-items:center;justify-content:center}
.flinks .col-logo .seal img{width:100%;height:100%;object-fit:contain;border-radius:50%}
.flinks .col-logo .badge-cer{width:60px;height:60px;background:#2a4d96;border-radius:6px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:11px;text-align:center;line-height:1.2}

/* === 页脚 320 范式三行 === */
.site-footer{background:#102357;color:#a3b3d6;padding:24px 0 28px;text-align:center;font-size:13px;line-height:2.1;border-top:1px solid rgba(255,255,255,.06)}
.site-footer .container{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:0 28px}
.site-footer p{margin:0;display:inline-flex;align-items:center;gap:6px}
.site-footer a{color:#cfd8ee}
.site-footer a:hover{color:#fff}
.site-footer .beian a{color:#cfd8ee}
.site-footer strong{color:#fff;font-weight:600}

/* === 列表页 === */
.bit-page{padding:48px 0;background:#f7f8fb;min-height:60vh}
.bit-page .container{display:grid;grid-template-columns:1fr 280px;gap:30px}
.bit-page-main{background:#fff;padding:30px 36px;border-radius:3px;box-shadow:0 2px 8px rgba(0,0,0,.05)}
.bit-crumb{font-size:13px;color:#888;margin-bottom:18px;padding-bottom:14px;border-bottom:1px solid #eee}
.bit-crumb a{color:#888}
.bit-crumb a:hover{color:#1d3a7a}
.bit-page-main h1.page-title{font-size:24px;color:#1d3a7a;margin-bottom:18px;font-weight:700}
.bit-list{margin:0}
.bit-list li{display:flex;justify-content:space-between;align-items:center;padding:16px 0;border-bottom:1px dashed #e8e8e8;gap:18px}
.bit-list li::before{content:'';width:6px;height:6px;border-radius:50%;background:#1d3a7a;flex-shrink:0}
.bit-list li a{flex:1;font-size:15px;color:#333;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.bit-list li a:hover{color:#1d3a7a}
.bit-list li .date{font-size:13px;color:#999;flex-shrink:0}
.bit-pagelist{margin-top:30px;text-align:center}
.bit-pagelist a,.bit-pagelist span{display:inline-block;padding:6px 14px;margin:0 3px;border:1px solid #e0e0e0;color:#555;font-size:13px;border-radius:2px}
.bit-pagelist .thisclass{background:#1d3a7a;color:#fff;border-color:#1d3a7a}

/* === 文章页 === */
.bit-article h1.art-title{font-size:26px;color:#222;margin-bottom:14px;line-height:1.4;font-weight:700;text-align:center}
.bit-article .meta{text-align:center;color:#999;font-size:13px;padding:10px 0 22px;border-bottom:1px solid #eee;margin-bottom:24px}
.bit-article .meta span{margin:0 10px}
.bit-article .body{font-size:15px;line-height:1.95;color:#333}
.bit-article .body p{margin:0 0 18px}
.bit-article .body img{margin:14px auto;max-width:100%;height:auto}
.bit-article .nav-pn{margin-top:34px;padding-top:18px;border-top:1px dashed #eee;font-size:14px;color:#666}
.bit-article .nav-pn p{margin:6px 0}

/* === 侧栏 === */
.bit-side{display:flex;flex-direction:column;gap:20px}
.bit-side .side-block{background:#fff;border-radius:3px;padding:18px 20px;box-shadow:0 2px 8px rgba(0,0,0,.05)}
.bit-side .side-block h3{font-size:16px;color:#1d3a7a;font-weight:700;padding-bottom:10px;border-bottom:2px solid #1d3a7a;margin-bottom:14px;letter-spacing:1px}
.bit-side ul li{padding:8px 0;border-bottom:1px dashed #eee;font-size:13px;display:flex;justify-content:space-between;gap:12px}
.bit-side ul li a{flex:1;color:#444;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.bit-side ul li a:hover{color:#1d3a7a}
.bit-side ul li .date{color:#999;font-size:12px;flex-shrink:0}

/* === 响应式：≤1200px → 移动端样式接管 === */
@media(max-width:1200px){
    .bit-rail{display:none}
    .container{width:100%;padding:0 12px}
    .bit-topbar{display:none}
    .bit-navbar{display:none}
}