/* ==================================================================
   BaiyuDown 白鱼资源下载主题  适配 Z-BlogPHP 1.7/1.8
   深色 / 浅色双模式，主色可在主题后台修改
   ================================================================== */

/* ---------- 主题变量 ---------- */
:root{
  --by-primary:#6ea8fe;
  --by-primary-soft:rgba(110,168,254,.14);
  --by-radius:12px;
  --by-radius-sm:8px;
  --by-header-h:60px;
  --by-maxw:1200px;
  --by-shadow:0 2px 12px rgba(0,0,0,.18);
  --by-transition:.22s ease;
}
html[data-theme="dark"]{
  --by-bg:#000;
  --by-bg-2:#0d0d0d;
  --by-card:#161616;
  --by-card-2:#1d1d1d;
  --by-card-hover:#202020;
  --by-border:#262626;
  --by-border-soft:#1f1f1f;
  --by-text:#ececec;
  --by-text-2:#a8a8a8;
  --by-text-3:#6f6f6f;
  --by-footer:#0c0c0c;
  --by-mask:rgba(0,0,0,.62);
  --by-input:#111;
}
html[data-theme="light"]{
  --by-bg:#f4f6f9;
  --by-bg-2:#eef1f5;
  --by-card:#fff;
  --by-card-2:#f7f9fc;
  --by-card-hover:#f2f6fc;
  --by-border:#e8ebf0;
  --by-border-soft:#eef1f5;
  --by-text:#1f2329;
  --by-text-2:#5f6672;
  --by-text-3:#9aa1ad;
  --by-footer:#fff;
  --by-mask:rgba(30,40,60,.4);
  --by-input:#f4f6f9;
  --by-shadow:0 2px 14px rgba(31,51,84,.08);
}

/* ---------- 基础重置 ---------- */
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  font-family:"MiSans","PingFang SC","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--by-bg);
  color:var(--by-text);
  line-height:1.7;
  font-size:15px;
  -webkit-font-smoothing:antialiased;
  transition:background var(--by-transition),color var(--by-transition);
}
a{color:inherit;text-decoration:none;transition:color var(--by-transition);}
img{display:block;max-width:100%;border:0;}
button{font-family:inherit;cursor:pointer;border:0;background:none;color:inherit;}
input,textarea{font-family:inherit;font-size:14px;outline:none;}
ul,ol{list-style:none;}
h1,h2,h3,h4{font-weight:600;line-height:1.4;}
.by-container{max-width:var(--by-maxw);margin:0 auto;padding:0 18px;width:100%;}
.by-main{padding:22px 0 40px;min-height:calc(100vh - 260px);}
.by-layout{display:flex;gap:22px;align-items:flex-start;}
.by-content{flex:1;min-width:0;}
.by-sidebar{width:300px;flex-shrink:0;position:sticky;top:calc(var(--by-header-h) + 14px);display:flex;flex-direction:column;gap:16px;}

/* ---------- 通用按钮 / 标签 ---------- */
.by-btn-primary{
  display:inline-block;background:var(--by-primary);color:#fff!important;
  padding:8px 20px;border-radius:var(--by-radius-sm);font-size:14px;
  text-align:center;transition:filter var(--by-transition),transform var(--by-transition);
  border:0;cursor:pointer;
}
.by-btn-primary:hover{filter:brightness(1.08);}
.by-btn-primary:active{transform:scale(.97);}
.by-btn-sm{padding:6px 16px;font-size:13px;}
.by-block{display:block;width:100%;padding:11px;font-size:15px;}
.by-tag{
  display:inline-block;padding:2px 10px;border-radius:6px;font-size:12px;
  background:var(--by-card-2);color:var(--by-text-2);margin:0 6px 6px 0;
  border:1px solid var(--by-border-soft);transition:all var(--by-transition);
}
.by-tag:hover{color:var(--by-primary);border-color:var(--by-primary);}
.by-tag-cat{color:var(--by-primary);border-color:var(--by-primary);background:var(--by-primary-soft);}
.by-circle{
  width:34px;height:34px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;
  background:var(--by-card-2);color:var(--by-text-2);border:1px solid var(--by-border);
  transition:all var(--by-transition);
}
.by-circle:hover{color:var(--by-primary);border-color:var(--by-primary);}
.by-avatar-xs{width:24px;height:24px;border-radius:50%;object-fit:cover;}

/* ==================================================================
   顶部导航
   ================================================================== */
.by-header{
  position:sticky;top:0;z-index:100;background:color-mix(in srgb,var(--by-bg) 86%,transparent);
  backdrop-filter:saturate(160%) blur(12px);border-bottom:1px solid var(--by-border-soft);
}
.by-nav{display:flex;align-items:center;height:var(--by-header-h);gap:26px;}
.by-logo{
  font-size:21px;font-weight:800;letter-spacing:1px;white-space:nowrap;
  font-family:"STKaiti","KaiTi","Songti SC",serif;position:relative;
}
.by-logo::after{content:"";position:absolute;left:0;bottom:-4px;width:100%;height:2px;background:var(--by-primary);border-radius:2px;}
.by-menu{flex:1;}
.by-menu ul{display:flex;gap:6px;flex-wrap:wrap;}
.by-menu li{position:relative;}
.by-menu>ul>li>a{
  display:block;padding:7px 13px;border-radius:8px;font-size:15px;color:var(--by-text-2);
  position:relative;white-space:nowrap;
}
.by-menu>ul>li>a:hover,.by-menu>ul>li.current>a{color:var(--by-primary);background:var(--by-primary-soft);}
.by-menu li ul{
  position:absolute;top:100%;left:0;min-width:130px;background:var(--by-card);
  border:1px solid var(--by-border);border-radius:10px;padding:6px;display:none;
  box-shadow:var(--by-shadow);z-index:50;
}
.by-menu li:hover>ul{display:block;}
.by-menu li ul a{display:block;padding:7px 12px;border-radius:6px;font-size:14px;color:var(--by-text-2);}
.by-menu li ul a:hover{background:var(--by-card-2);color:var(--by-primary);}
.by-nav-right{display:flex;align-items:center;gap:6px;margin-left:auto;}
.by-icon-btn{
  width:36px;height:36px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;
  color:var(--by-text-2);transition:all var(--by-transition);
}
.by-icon-btn:hover{color:var(--by-primary);background:var(--by-primary-soft);}
.by-icon-sun{display:none;}
html[data-theme="light"] .by-icon-moon{display:none;}
html[data-theme="light"] .by-icon-sun{display:block;}
.by-userbox{position:relative;}
.by-userbtn{display:flex;align-items:center;gap:6px;padding:4px 10px 4px 4px;border-radius:20px;background:var(--by-card-2);border:1px solid var(--by-border);}
.by-username{font-size:13px;max-width:90px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.by-userdrop{
  position:absolute;top:calc(100% + 8px);right:0;min-width:120px;background:var(--by-card);
  border:1px solid var(--by-border);border-radius:10px;padding:6px;display:none;box-shadow:var(--by-shadow);z-index:60;
}
.by-userbox:hover .by-userdrop,.by-userbox:focus-within .by-userdrop{display:block;}
.by-userdrop a{display:block;padding:8px 12px;border-radius:6px;font-size:14px;}
.by-userdrop a:hover{background:var(--by-card-2);color:var(--by-primary);}
.by-burger{display:none;flex-direction:column;gap:4px;width:34px;height:34px;align-items:center;justify-content:center;}
.by-burger span{width:20px;height:2px;background:var(--by-text);border-radius:2px;}

/* 顶部展开搜索条 */
.by-searchbar{max-height:0;overflow:hidden;transition:max-height .3s ease;border-top:1px solid transparent;}
.by-searchbar.open{max-height:80px;border-top-color:var(--by-border-soft);}
.by-searchbar form{display:flex;align-items:center;gap:10px;padding:14px 18px;color:var(--by-text-3);}
.by-searchbar input{flex:1;background:transparent;border:0;color:var(--by-text);font-size:15px;}
.by-searchbar button{padding:7px 22px;border-radius:8px;background:var(--by-primary);color:#fff;}

/* ==================================================================
   轮播横幅
   ================================================================== */
.by-banner{position:relative;border-radius:var(--by-radius);overflow:hidden;margin-bottom:20px;height:180px;background:var(--by-card-2);}
.by-banner-track{height:100%;position:relative;}
.by-banner-slide{
  position:absolute;inset:0;opacity:0;transition:opacity .6s ease;
  background-size:cover;background-position:center;display:flex;align-items:center;
}
.by-banner-slide::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(0,0,0,.62),rgba(0,0,0,.12));}
html[data-theme="light"] .by-banner-slide::before{background:linear-gradient(90deg,rgba(20,30,55,.5),rgba(20,30,55,.05));}
.by-banner-slide.active{opacity:1;z-index:1;}
.by-banner-text{position:relative;z-index:2;padding:0 38px;color:#fff;}
.by-banner-text h2{font-size:26px;font-weight:700;margin-bottom:8px;text-shadow:0 2px 8px rgba(0,0,0,.3);}
.by-banner-text p{font-size:14px;opacity:.92;}
.by-banner-prev,.by-banner-next{
  position:absolute;top:50%;transform:translateY(-50%);z-index:3;width:38px;height:38px;border-radius:50%;
  background:rgba(0,0,0,.32);color:#fff;font-size:22px;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity var(--by-transition);
}
.by-banner:hover .by-banner-prev,.by-banner:hover .by-banner-next{opacity:1;}
.by-banner-prev{left:12px;}.by-banner-next{right:12px;}
.by-banner-dots{position:absolute;bottom:12px;right:18px;z-index:3;display:flex;gap:7px;}
.by-banner-dots button{width:7px;height:7px;border-radius:50%;background:rgba(255,255,255,.45);}
.by-banner-dots button.active{background:#fff;width:18px;border-radius:4px;}

/* 排序条 */
.by-sortbar{display:flex;align-items:center;gap:12px;margin-bottom:16px;color:var(--by-text-3);font-size:14px;}
.by-sortbar em{font-style:normal;opacity:.5;}
.by-sortbar button{color:var(--by-text-2);font-size:14px;padding:2px 4px;}
.by-sortbar button.active{color:var(--by-primary);font-weight:600;}

/* ==================================================================
   文章卡片列表
   ================================================================== */
.by-post-list{display:flex;flex-direction:column;gap:14px;}
.by-post-card{
  display:flex;gap:18px;background:var(--by-card);border:1px solid var(--by-border-soft);
  border-radius:var(--by-radius);padding:16px;transition:all var(--by-transition);
}
.by-post-card:hover{background:var(--by-card-hover);transform:translateY(-2px);box-shadow:var(--by-shadow);}
.by-post-top{border-color:color-mix(in srgb,var(--by-primary) 40%,var(--by-border));}
.by-post-thumb{
  width:168px;height:118px;flex-shrink:0;border-radius:10px;overflow:hidden;background:var(--by-card-2);
  position:relative;
}
.by-post-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s ease;}
.by-post-card:hover .by-post-thumb img{transform:scale(1.06);}
.by-top-flag{
  position:absolute;left:0;top:0;background:var(--by-primary);color:#fff;font-size:11px;
  padding:2px 8px;border-bottom-right-radius:8px;
}
.by-post-body{flex:1;min-width:0;display:flex;flex-direction:column;}
.by-post-title{font-size:18px;font-weight:600;line-height:1.4;margin-bottom:8px;}
.by-post-title a{
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.by-post-title a:hover{color:var(--by-primary);}
.by-post-excerpt{
  color:var(--by-text-2);font-size:13.5px;line-height:1.6;margin-bottom:10px;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.by-post-tags{margin-bottom:auto;}
.by-post-tags .by-tag{margin-bottom:0;}
.by-post-meta{display:flex;justify-content:space-between;margin-top:10px;color:var(--by-text-3);font-size:12.5px;}

/* 归档/搜索头部 */
.by-archive-head{
  background:var(--by-card);border:1px solid var(--by-border-soft);border-radius:var(--by-radius);
  padding:26px 28px;margin-bottom:18px;
}
.by-archive-head h1{font-size:22px;margin-bottom:6px;}
.by-archive-head p{color:var(--by-text-2);font-size:14px;}
.by-search-head{margin-bottom:18px;}
.by-bigsearch{display:flex;gap:10px;background:var(--by-card);border:1px solid var(--by-border-soft);border-radius:var(--by-radius);padding:14px;}
.by-bigsearch input{flex:1;background:var(--by-input);border:1px solid var(--by-border);border-radius:8px;padding:11px 14px;color:var(--by-text);}
.by-bigsearch button{padding:0 28px;border-radius:8px;background:var(--by-primary);color:#fff;}
.by-search-stat{padding:12px 6px;color:var(--by-text-2);font-size:14px;}
.by-search-stat b{color:var(--by-primary);}
.by-empty{padding:80px 0;text-align:center;color:var(--by-text-3);background:var(--by-card);border-radius:var(--by-radius);}

/* ==================================================================
   侧边栏
   ================================================================== */
.by-widget{background:var(--by-card);border:1px solid var(--by-border-soft);border-radius:var(--by-radius);padding:18px;}
.by-widget-title{
  font-size:16px;font-weight:600;margin-bottom:14px;padding-left:10px;position:relative;
}
.by-widget-title::before,.by-block-title::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:4px;height:16px;background:var(--by-primary);border-radius:2px;
}
.by-block-title{font-size:18px;font-weight:600;margin-bottom:16px;padding-left:12px;position:relative;}
.by-block-title em{font-style:normal;font-size:13px;color:var(--by-text-3);font-weight:400;margin-left:6px;}

/* 站长卡片 */
.by-master{text-align:center;}
.by-master-avatar{width:64px;height:64px;border-radius:50%;object-fit:cover;margin:0 auto 10px;border:2px solid var(--by-border);}
.by-master-name{font-size:16px;font-weight:600;margin-bottom:4px;}
.by-master-intro{font-size:12.5px;color:var(--by-text-2);margin-bottom:12px;}
.by-master-icons{display:flex;justify-content:center;gap:10px;}

/* 迷你列表（热门） */
.by-mini-list li{margin-bottom:12px;}
.by-mini-list li:last-child{margin-bottom:0;}
.by-mini-item{display:flex;gap:10px;align-items:flex-start;}
.by-mini-item img{width:64px;height:48px;border-radius:7px;object-fit:cover;flex-shrink:0;background:var(--by-card-2);}
.by-mini-body{flex:1;min-width:0;display:flex;flex-direction:column;gap:4px;}
.by-mini-title{
  font-size:13.5px;line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.by-mini-item:hover .by-mini-title{color:var(--by-primary);}
.by-mini-meta{font-size:12px;color:var(--by-text-3);}

/* 标签云 */
.by-tagcloud{display:flex;flex-wrap:wrap;gap:8px;}
.by-tagcloud a{
  font-size:12.5px;padding:3px 10px;border-radius:6px;background:var(--by-card-2);
  color:var(--by-text-2);border:1px solid var(--by-border-soft);
}
.by-tagcloud a em{font-style:normal;color:var(--by-text-3);font-size:11px;margin-left:2px;}
.by-tagcloud a:hover{color:var(--by-primary);border-color:var(--by-primary);}

/* 最近评论 */
.by-cmt-list li{display:flex;gap:10px;padding:10px 0;border-bottom:1px dashed var(--by-border-soft);}
.by-cmt-list li:last-child{border-bottom:0;padding-bottom:0;}
.by-cmt-list li:first-child{padding-top:0;}
.by-cmt-avatar{width:34px;height:34px;border-radius:8px;object-fit:cover;flex-shrink:0;background:var(--by-card-2);}
.by-cmt-body{min-width:0;flex:1;}
.by-cmt-head{display:flex;gap:8px;align-items:baseline;font-size:12.5px;margin-bottom:2px;}
.by-cmt-head b{font-weight:600;font-size:13px;}
.by-cmt-head span{color:var(--by-text-3);font-size:12px;}
.by-cmt-text{font-size:12.5px;color:var(--by-text-2);line-height:1.5;display:block;}
a.by-cmt-text:hover{color:var(--by-primary);}

/* 看看别的 标签页 */
.by-tab-head{display:flex;gap:16px;margin-bottom:12px;border-bottom:1px solid var(--by-border-soft);}
.by-tab-head button{padding-bottom:8px;font-size:14px;color:var(--by-text-2);position:relative;}
.by-tab-head button.active{color:var(--by-primary);font-weight:600;}
.by-tab-head button.active::after{content:"";position:absolute;left:0;bottom:-1px;width:100%;height:2px;background:var(--by-primary);border-radius:2px;}
.by-rank-list{display:none;flex-direction:column;}
.by-rank-list.active{display:flex;}
.by-rank-list li{display:flex;align-items:center;gap:10px;padding:6px 0;}
.by-rank-no{
  width:18px;height:18px;border-radius:5px;background:var(--by-card-2);color:var(--by-text-3);
  font-size:12px;display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;
}
.by-rank-list li:nth-child(-n+3) .by-rank-no{background:var(--by-primary-soft);color:var(--by-primary);}
.by-rank-list a{font-size:13.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0;}
.by-rank-list a:hover{color:var(--by-primary);}

/* ==================================================================
   文章详情页
   ================================================================== */
.by-detail{background:var(--by-card);border:1px solid var(--by-border-soft);border-radius:var(--by-radius);padding:30px 34px;margin-bottom:18px;}
.by-breadcrumb{font-size:13px;color:var(--by-text-3);margin-bottom:18px;display:flex;gap:8px;flex-wrap:wrap;}
.by-breadcrumb a:hover{color:var(--by-primary);}
.by-detail-head{text-align:center;padding-bottom:20px;margin-bottom:24px;border-bottom:1px solid var(--by-border-soft);}
.by-detail-title{font-size:27px;font-weight:700;line-height:1.4;margin-bottom:14px;}
.by-detail-author{display:flex;align-items:center;justify-content:center;gap:7px;margin-bottom:10px;font-size:14px;}
.by-detail-meta{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;color:var(--by-text-3);font-size:13px;}
.by-detail-meta em{font-style:normal;opacity:.5;}

.by-detail-content{font-size:15.5px;line-height:1.9;color:var(--by-text);}
.by-detail-content p{margin:0 0 18px;}
.by-detail-content h2,.by-detail-content h3,.by-detail-content h4{margin:28px 0 14px;}
.by-detail-content h3{padding-left:11px;border-left:4px solid var(--by-primary);font-size:19px;}
.by-detail-content h2{font-size:22px;}
.by-detail-content img{border-radius:8px;margin:16px auto;}
.by-detail-content a{color:var(--by-primary);}
.by-detail-content blockquote{
  border-left:4px solid var(--by-primary);background:var(--by-card-2);padding:12px 18px;
  border-radius:0 8px 8px 0;color:var(--by-text-2);margin:16px 0;
}
.by-detail-content pre{
  background:var(--by-bg-2);border:1px solid var(--by-border);border-radius:10px;
  padding:16px;overflow-x:auto;margin:16px 0;font-size:13.5px;line-height:1.6;
}
.by-detail-content code{background:var(--by-card-2);padding:2px 6px;border-radius:5px;font-size:13.5px;}
.by-detail-content pre code{background:none;padding:0;}
.by-detail-content ul,.by-detail-content ol{padding-left:22px;margin-bottom:16px;}
.by-detail-content li{margin-bottom:6px;}
.by-detail-content table{width:100%;border-collapse:collapse;margin:16px 0;}
.by-detail-content th,.by-detail-content td{border:1px solid var(--by-border);padding:8px 12px;}

/* 附件下载区 */
.by-download{border:1px solid var(--by-border);border-radius:var(--by-radius);background:var(--by-card-2);padding:20px;margin:26px 0;}
.by-download-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:14px;flex-wrap:wrap;gap:6px;}
.by-download-head h3{font-size:17px;padding-left:11px;position:relative;}
.by-download-head h3::before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:4px;height:16px;background:var(--by-primary);border-radius:2px;}
.by-download-head span{font-size:12.5px;color:var(--by-text-3);}
.by-download-item{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  background:var(--by-card);border:1px solid var(--by-border-soft);border-radius:10px;padding:13px 16px;margin-bottom:10px;
}
.by-download-item:last-child{margin-bottom:0;}
.by-file-info{display:flex;align-items:center;gap:12px;min-width:0;}
.by-file-icon{color:var(--by-primary);display:flex;}
.by-file-meta{display:flex;flex-direction:column;min-width:0;}
.by-file-name{font-size:14.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.by-file-size{font-size:12.5px;color:var(--by-text-3);}

.by-endline{display:flex;align-items:center;gap:14px;margin:28px 0 20px;color:var(--by-text-3);font-size:13px;}
.by-endline::before,.by-endline::after{content:"";flex:1;height:1px;background:var(--by-border);}
.by-detail-tags{margin-bottom:16px;}
.by-cc{
  display:flex;gap:9px;align-items:flex-start;font-size:13px;color:var(--by-text-2);
  border-top:1px solid var(--by-border-soft);padding-top:18px;
}
.by-cc svg{flex-shrink:0;margin-top:3px;color:var(--by-text-3);}
.by-detail-foot{display:flex;align-items:center;justify-content:space-between;margin-top:18px;}
.by-useful{
  display:inline-flex;align-items:center;gap:6px;padding:6px 16px;border-radius:20px;
  background:var(--by-card-2);border:1px solid var(--by-border);color:var(--by-text-2);font-size:13.5px;
}
.by-useful.actived{color:var(--by-primary);border-color:var(--by-primary);background:var(--by-primary-soft);}
.by-detail-view{font-size:13px;color:var(--by-text-3);}

/* 相关阅读 */
.by-related{background:var(--by-card);border:1px solid var(--by-border-soft);border-radius:var(--by-radius);padding:22px 24px;margin-bottom:18px;}
.by-related-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;}
.by-related-item{display:flex;gap:12px;align-items:center;padding:10px;border-radius:10px;transition:background var(--by-transition);}
.by-related-item:hover{background:var(--by-card-2);}
.by-related-item img{width:96px;height:66px;border-radius:8px;object-fit:cover;flex-shrink:0;background:var(--by-card-2);}
.by-related-body{display:flex;flex-direction:column;gap:6px;min-width:0;}
.by-related-title{font-size:14px;line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.by-related-item:hover .by-related-title{color:var(--by-primary);}
.by-related-meta{font-size:12px;color:var(--by-text-3);}

/* 上下篇 */
.by-prevnext{display:flex;gap:14px;margin-bottom:18px;}
.by-prevnext>div{flex:1;background:var(--by-card);border:1px solid var(--by-border-soft);border-radius:10px;padding:12px 16px;min-width:0;}
.by-prevnext span{display:block;font-size:12px;color:var(--by-text-3);margin-bottom:3px;}
.by-prevnext a{font-size:14px;display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.by-prevnext a:hover{color:var(--by-primary);}
.by-next{text-align:right;}

/* ==================================================================
   独立页面 / 友链
   ================================================================== */
.by-page-banner{
  background:var(--by-card);border:1px solid var(--by-border-soft);border-radius:var(--by-radius);
  height:130px;display:flex;align-items:center;justify-content:center;margin-bottom:18px;
  background-image:linear-gradient(135deg,var(--by-card) 0%,var(--by-card-2) 100%);
}
.by-page-banner h1{font-size:26px;}
.by-page-card{background:var(--by-card);border:1px solid var(--by-border-soft);border-radius:var(--by-radius);padding:30px 34px;}
.by-links-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:22px 0;}
.by-link-card{
  display:flex;align-items:center;gap:12px;padding:14px;border-radius:10px;background:var(--by-card-2);
  border:1px solid var(--by-border-soft);transition:all var(--by-transition);
}
.by-link-card:hover{border-color:var(--by-primary);transform:translateY(-2px);}
.by-link-card img,.by-link-letter{width:42px;height:42px;border-radius:10px;object-fit:cover;flex-shrink:0;background:var(--by-primary-soft);}
.by-link-letter{display:flex;align-items:center;justify-content:center;color:var(--by-primary);font-size:20px;font-weight:700;}
.by-link-text{display:flex;flex-direction:column;min-width:0;}
.by-link-text b{font-size:14.5px;}
.by-link-text em{font-style:normal;font-size:12.5px;color:var(--by-text-3);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.by-links-empty{grid-column:1/-1;text-align:center;color:var(--by-text-3);padding:30px;}
.by-join-btn{display:block;text-align:center;padding:12px;border-radius:10px;background:var(--by-card-2);border:1px solid var(--by-border);color:var(--by-text-2);}
.by-join-btn:hover{color:var(--by-primary);border-color:var(--by-primary);}

/* ==================================================================
   评论区
   ================================================================== */
.by-comments{background:var(--by-card);border:1px solid var(--by-border-soft);border-radius:var(--by-radius);padding:24px;}
.by-cmt-form{margin-bottom:24px;}
.by-cmt-inputrow{display:flex;gap:12px;}
.by-cmt-avatar{width:40px;height:40px;flex-shrink:0;border-radius:10px;overflow:hidden;background:var(--by-card-2);color:var(--by-text-3);display:flex;align-items:center;justify-content:center;}
.by-cmt-avatar img{width:100%;height:100%;object-fit:cover;}
.by-cmt-main{flex:1;min-width:0;}
.by-cmt-main textarea{
  width:100%;background:var(--by-input);border:1px solid var(--by-border);border-radius:10px;
  padding:12px 14px;color:var(--by-text);resize:vertical;line-height:1.6;
}
.by-cmt-main textarea:focus{border-color:var(--by-primary);}
.by-cmt-fields{display:flex;gap:10px;margin-top:10px;}
.by-cmt-fields input{flex:1;min-width:0;background:var(--by-input);border:1px solid var(--by-border);border-radius:8px;padding:9px 12px;color:var(--by-text);}
.by-cmt-verify{display:flex;gap:10px;align-items:center;margin-top:10px;}
.by-cmt-verify input{width:140px;background:var(--by-input);border:1px solid var(--by-border);border-radius:8px;padding:9px 12px;color:var(--by-text);}
.by-cmt-verify img{height:38px;border-radius:8px;cursor:pointer;}
.by-cmt-bar{display:flex;align-items:center;justify-content:space-between;margin-top:10px;flex-wrap:wrap;gap:8px;}
.by-cmt-tools{display:flex;gap:6px;}
.by-cmt-tools button{font-size:13px;color:var(--by-text-2);padding:5px 12px;border-radius:7px;background:var(--by-card-2);border:1px solid var(--by-border-soft);}
.by-cmt-tools button:hover{color:var(--by-primary);border-color:var(--by-primary);}
.by-reply-tip{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--by-primary);margin-bottom:8px;}
.by-reply-tip button{font-size:12px;color:var(--by-text-3);text-decoration:underline;}

.by-cmt-list .by-cmt-item{display:flex;gap:12px;padding:16px 0;border-bottom:1px dashed var(--by-border-soft);}
.by-cmt-useravatar img{width:40px;height:40px;border-radius:10px;object-fit:cover;flex-shrink:0;background:var(--by-card-2);}
.by-cmt-content{flex:1;min-width:0;}
.by-cmt-info{display:flex;align-items:center;gap:8px;margin-bottom:4px;}
.by-cmt-info b{font-size:14px;}
.by-badge-master{background:var(--by-primary-soft);color:var(--by-primary);font-size:11px;padding:1px 7px;border-radius:5px;}
.by-floor{font-size:11.5px;color:var(--by-text-3);}
.by-cmt-text{font-size:14.5px;line-height:1.7;word-break:break-word;}
.by-cmt-foot{display:flex;gap:14px;margin-top:5px;font-size:12.5px;color:var(--by-text-3);}
.by-reply-btn{font-size:12.5px;color:var(--by-text-3);}
.by-reply-btn:hover{color:var(--by-primary);}
.by-cmt-children{
  margin-top:12px;padding:12px 14px;background:var(--by-card-2);border-radius:10px;
  display:flex;flex-direction:column;
}
.by-cmt-children .by-cmt-item{padding:10px 0;border-bottom:1px dashed var(--by-border);}
.by-cmt-children .by-cmt-item:last-child{border-bottom:0;padding-bottom:0;}
.by-cmt-empty{text-align:center;color:var(--by-text-3);padding:30px 0;}

/* ==================================================================
   分页
   ================================================================== */
.by-pagination{display:flex;justify-content:center;gap:6px;margin-top:26px;flex-wrap:wrap;}
.by-pagination a,.by-pagination span{
  min-width:36px;height:36px;padding:0 10px;display:inline-flex;align-items:center;justify-content:center;
  border-radius:8px;background:var(--by-card);border:1px solid var(--by-border-soft);font-size:14px;color:var(--by-text-2);
}
.by-pagination a:hover{color:var(--by-primary);border-color:var(--by-primary);}
.by-pagination .current{background:var(--by-primary);color:#fff;border-color:var(--by-primary);}

/* ==================================================================
   登录 / 注册弹窗
   ================================================================== */
.by-modal{
  position:fixed;inset:0;z-index:1000;display:none;align-items:center;justify-content:center;
  background:var(--by-mask);backdrop-filter:blur(3px);padding:18px;
}
.by-modal.open{display:flex;}
.by-modal-box{
  width:100%;max-width:400px;background:var(--by-card);border:1px solid var(--by-border);
  border-radius:16px;padding:28px 26px;position:relative;box-shadow:0 18px 60px rgba(0,0,0,.4);
  animation:byPop .25s ease;
}
@keyframes byPop{from{transform:translateY(16px) scale(.97);opacity:0;}to{transform:none;opacity:1;}}
.by-modal-close{position:absolute;right:16px;top:14px;font-size:24px;color:var(--by-text-3);line-height:1;}
.by-modal-title{font-size:21px;margin-bottom:4px;}
.by-modal-switch{font-size:13px;color:var(--by-primary);position:absolute;right:26px;top:32px;}
.by-auth-form{margin-top:18px;display:flex;flex-direction:column;gap:13px;}
.by-input{position:relative;display:flex;align-items:center;}
.by-input svg{position:absolute;left:13px;color:var(--by-text-3);}
.by-input input{
  width:100%;background:var(--by-input);border:1px solid var(--by-border);border-radius:10px;
  padding:11px 40px 11px 38px;color:var(--by-text);
}
.by-input input:focus{border-color:var(--by-primary);}
.by-pwd-eye{position:absolute;right:10px;color:var(--by-text-3);display:flex;}
.by-form-row{font-size:13px;}
.by-check{display:inline-flex;align-items:center;gap:6px;color:var(--by-text-2);cursor:pointer;}
.by-modal-note{font-size:12px;color:var(--by-text-3);text-align:center;}
.by-mask{display:none;}

/* 全局提示 toast */
.by-toast{
  position:fixed;top:76px;left:50%;transform:translateX(-50%);z-index:1200;
  padding:11px 22px;border-radius:10px;font-size:14px;box-shadow:var(--by-shadow);
  background:var(--by-card);border:1px solid var(--by-border);animation:byPop .25s ease;
}
.by-toast-good{border-color:#52c41a;color:#52c41a;}
.by-toast-bad{border-color:#ff6b6b;color:#ff6b6b;}

/* ==================================================================
   页脚
   ================================================================== */
.by-footer{background:var(--by-footer);border-top:1px solid var(--by-border-soft);padding:34px 0;}
.by-footer-inner{display:flex;gap:30px;align-items:flex-start;justify-content:space-between;flex-wrap:wrap;}
.by-logo-footer{font-size:22px;margin-bottom:10px;}
.by-logo-footer::after{display:none;}
.by-footer-brand p{font-size:12.5px;color:var(--by-text-3);margin-bottom:5px;}
.by-footer-mid{flex:1;min-width:240px;}
.by-footer-nav{display:flex;gap:18px;flex-wrap:wrap;margin-bottom:10px;font-size:14px;}
.by-footer-nav a:hover{color:var(--by-primary);}
.by-footer-mid p{font-size:12.5px;color:var(--by-text-3);margin-bottom:5px;}
.by-footer-icons{display:flex;gap:10px;}

/* 回到顶部 */
.by-backtop{
  position:fixed;right:24px;bottom:30px;z-index:90;width:44px;height:44px;border-radius:50%;
  background:var(--by-card);border:1px solid var(--by-border);color:var(--by-primary);
  display:flex;align-items:center;justify-content:center;box-shadow:var(--by-shadow);
  opacity:0;visibility:hidden;transition:all var(--by-transition);
}
.by-backtop.show{opacity:1;visibility:visible;}
.by-backtop:hover{background:var(--by-primary);color:#fff;}

/* 404 */
.by-404{text-align:center;padding:90px 20px;background:var(--by-card);border-radius:var(--by-radius);}
.by-404-code{font-size:88px;font-weight:800;color:var(--by-primary);line-height:1;margin-bottom:16px;}
.by-404 p{color:var(--by-text-2);margin-bottom:24px;}

/* ==================================================================
   响应式
   ================================================================== */
@media (max-width:1080px){
  .by-sidebar{width:260px;}
  .by-post-thumb{width:140px;height:100px;}
}
@media (max-width:900px){
  .by-layout{flex-direction:column;}
  .by-sidebar{width:100%;position:static;flex-direction:row;flex-wrap:wrap;}
  .by-widget{flex:1 1 280px;}
  .by-master{flex-basis:100%;}
}
@media (max-width:768px){
  .by-burger{display:flex;}
  .by-nav{gap:14px;}
  .by-menu{
    position:fixed;top:var(--by-header-h);left:0;right:0;background:var(--by-card);
    border-bottom:1px solid var(--by-border);max-height:0;overflow:hidden;transition:max-height .3s ease;z-index:99;
  }
  .by-menu.open{max-height:70vh;overflow-y:auto;}
  .by-menu>ul{flex-direction:column;padding:10px 18px;gap:0;}
  .by-menu li ul{position:static;display:block;box-shadow:none;border:0;padding-left:14px;}
  .by-banner{height:140px;}
  .by-banner-text{padding:0 22px;}
  .by-banner-text h2{font-size:20px;}
  .by-post-card{flex-direction:column;gap:12px;padding:14px;}
  .by-post-thumb{width:100%;height:180px;}
  .by-detail,.by-page-card{padding:20px 18px;}
  .by-detail-title{font-size:21px;}
  .by-related-grid{grid-template-columns:1fr;}
  .by-links-grid{grid-template-columns:repeat(2,1fr);}
  .by-prevnext{flex-direction:column;gap:10px;}
  .by-next{text-align:left;}
  .by-cmt-fields{flex-direction:column;}
  .by-username{display:none;}
}
@media (max-width:480px){
  .by-links-grid{grid-template-columns:1fr;}
  .by-post-thumb{height:150px;}
  .by-detail-meta{gap:6px;font-size:12px;}
}