/* ============================================================
   工具箱导航 前台样式
   首页：容器1600px，PC一排8个(卡片200x100,图标55x55)，移动端一排2个(图标25x25)
   内页：主内容1200px + 右侧栏400px，简介容器 #f5f5f6
   ============================================================ */
*{margin:0;padding:0;box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:#f6f7f9;color:#24292f;font-size:16px;line-height:1.7;
}
a{color:inherit;text-decoration:none}
img{display:block}
:root{--blue:#2f6bff;--blue-dark:#1f55d6;--ink:#24292f;--muted:#8a929c;--line:#e7eaef;--card:#fff}

/* ---------- 顶部导航（分类栏） ---------- */
.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:100}
.sh-inner{max-width:1600px;margin:0 auto;padding:0 20px;height:56px;display:flex;align-items:center;gap:24px}
.site-logo{font-size:19px;font-weight:800;color:var(--blue);white-space:nowrap}
.cat-nav{display:flex;align-items:center;gap:4px;overflow-x:auto;scrollbar-width:none;flex:1}
.cat-nav::-webkit-scrollbar{display:none}
.cat-item{display:inline-block;padding:6px 14px;border-radius:8px;color:#4b5563;font-size:14px;white-space:nowrap;transition:all .15s}
.cat-item:hover{background:#eef3ff;color:var(--blue)}
.cat-item.active{background:var(--blue);color:#fff;font-weight:600}

/* 顶部站内搜索框 */
.site-search{position:relative;display:flex;align-items:stretch;flex-shrink:0;width:300px;height:36px;padding:0;gap:0;overflow:hidden;border:1px solid var(--line);border-radius:6px;background:#f6f8fb;transition:border-color .15s,background .15s}
.site-search-input{flex:1;min-width:0;width:auto;height:100%;padding:0 10px;border:none;background:transparent;font-size:14px;color:var(--ink);outline:none;-webkit-appearance:none;appearance:none}
.site-search-input::placeholder{color:#aab2bd}
.site-search:focus-within{border-color:var(--blue);background:#fff}
.site-search-btn{flex:none;display:inline-flex;align-items:center;justify-content:center;height:100%;padding:0 18px;border:none;border-radius:0;background:var(--blue);color:#fff;font-size:14px;line-height:1;cursor:pointer;white-space:nowrap;transition:background .15s}
.site-search-btn:hover{background:var(--blue-dark)}
.search-empty{text-align:center;color:var(--muted);padding:48px 0;line-height:2}
@media(max-width:768px){.site-search{width:172px;height:34px;padding:0}.site-search-input{padding:0 8px;font-size:13px}.site-search-btn{padding:0 12px;font-size:13px}}

/* ---------- 页面容器 ---------- */
.page-container{max-width:1600px;margin:0 auto;padding:20px 20px 60px}
.page-hero{padding:26px 0 20px}
.page-hero h1{font-size:26px;font-weight:800}
.page-hero>p{color:var(--muted);margin-top:6px;font-size:14px}

/* ---------- 工具卡片网格 ---------- */
.tool-grid{display:grid;grid-template-columns:repeat(6,250px);justify-content:space-between;gap:16px 10px}
.tool-card{
  display:flex;align-items:flex-start;gap:8px;width:250px;height:68px;padding:6px;
  background:var(--card);border:1px solid var(--line);border-radius:6px;
  transition:transform .15s,box-shadow .15s,border-color .15s;overflow:hidden;
}
.tool-card:hover{transform:translateY(-3px);box-shadow:0 10px 24px -12px rgba(31,60,120,.28);border-color:#d5e0ff}
.tool-icon{flex:none;background:#eef3ff;color:var(--blue);border-radius:10px;overflow:hidden;
  display:inline-flex;align-items:center;justify-content:center;font-weight:700}
.tool-icon img{width:100%;height:100%;object-fit:cover}
.tool-icon-55{width:55px;height:55px;font-size:22px}
.tool-icon-25{width:25px;height:25px;border-radius:6px;font-size:13px}
.tc-body{display:flex;flex-direction:column;min-width:0;height:100%;flex:1}
.tc-head{display:flex;align-items:flex-start;min-width:0}
.tc-title{font-size:14px;font-weight:600;line-height:1.25;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:var(--ink)}
.tc-desc{flex:1;margin-top:3px;font-size:12px;color:#7b848f;line-height:1.45;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.tc-meta{display:none}
.tc-views{white-space:nowrap}

/* ---------- 内页：主内容1200 + 右栏400 ---------- */
.article-wrap{max-width:1620px;margin:0 auto;display:flex;gap:20px;align-items:flex-start}
.article-main{flex:1;min-width:0;max-width:1200px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:34px 40px 44px}
.article-side{width:400px;flex:none;position:sticky;top:76px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px 12px}
.side-title{font-size:14px;font-weight:700;padding:0 4px 10px;border-bottom:1px solid var(--line);margin-bottom:10px}
.side-card{display:flex;align-items:center;gap:8px;padding:8px 4px;border-radius:8px}
.side-card:hover{background:#f2f6ff}
.side-icon{width:34px;height:34px;border-radius:8px;font-size:14px;flex:none}
.sc-body{min-width:0}
.sc-title{display:block;font-size:12.5px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sc-meta{display:block;font-size:11.5px;color:var(--muted);margin-top:1px}
.side-empty{font-size:12px;color:var(--muted);text-align:center;padding:12px 0}

/* ---------- 文章页头部 ---------- */
.art-title{text-align:center;font-size:28px;font-weight:800;line-height:1.4;color:var(--ink)}
.art-divider{height:1px;background:var(--line);margin:18px auto 22px}
.art-intro{background:#f5f5f6;border-radius:10px;padding:14px 18px;font-size:14px;color:#5a6470;line-height:1.8}
.art-content{margin-top:24px;color:#333a42;font-size:15.5px;line-height:1.9;word-break:break-word}
.art-content p{margin:0 0 16px}
.art-content a{color:var(--blue);border-bottom:1px solid rgba(47,107,255,.35)}
.art-content a:hover{color:var(--blue-dark)}
.art-content h2,.art-content h3{margin:22px 0 12px;font-weight:700}
/* UEditor 插入内容的移动端自适应：图片/视频/表格不得超出正文容器。
   UEditor 常给图片写内联 width/height，用 !important 强制宽度封顶并按比例还原高度。 */
.art-content img{max-width:100% !important;height:auto !important;border-radius:8px;box-sizing:border-box;}
.art-content video{max-width:100%;height:auto;border-radius:8px;}
.art-content iframe{max-width:100%;border-radius:8px;}
.art-content table{max-width:100%;display:block;overflow-x:auto;}
.art-content pre{max-width:100%;white-space:pre-wrap;word-break:break-word;}
.art-content embed,.art-content object{max-width:100%;}
@media (max-width:768px){
  .art-content{font-size:15px;line-height:1.85;}
}
.art-sec-title{font-size:20px;font-weight:800;margin:34px 0 16px;padding-left:12px;border-left:4px solid var(--blue)}

/* ---------- FAQ 五种版式 ---------- */
.art-faq{margin-top:8px}
.faq-item{margin-bottom:12px}
.faq-q{font-weight:600;font-size:15px;display:flex;gap:8px;align-items:baseline}
.faq-no{flex:none;width:22px;height:22px;border-radius:50%;background:var(--blue);color:#fff;font-size:12px;
  display:inline-flex;align-items:center;justify-content:center;transform:translateY(4px)}
.faq-a{color:#5a6470;font-size:14px;line-height:1.8;padding:8px 0 0 30px}
.faq-a p{margin:0}
/* v2 手风琴 */
.faq-v2 .faq-item{border:1px solid var(--line);border-radius:10px;overflow:hidden;margin-bottom:8px}
.faq-v2 summary{cursor:pointer;padding:12px 16px;font-weight:600;list-style:none;background:#fafbfc}
.faq-v2 summary::-webkit-details-marker{display:none}
.faq-v2 summary::before{content:"+";margin-right:8px;color:var(--blue);font-weight:700}
.faq-v2 details[open] summary::before{content:"−"}
.faq-v2 .faq-a{padding:10px 16px 12px}
/* v3 双栏 */
.faq-v3 .art-faq,.faq-v3.faq-grid-wrap{--faqcols:2}
.faq-v3 .faq-list{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.faq-v3 .faq-item{background:#fafbfd;border:1px solid var(--line);border-radius:10px;padding:14px 16px;margin:0}
.faq-v3 .faq-a{padding:6px 0 0}
/* v4 左侧蓝条 */
.faq-v4 .faq-item{border-left:3px solid var(--blue);background:#f8faff;border-radius:0 10px 10px 0;padding:12px 16px}
.faq-v4 .faq-a{padding:6px 0 0}
/* v5 序号方块+分割线 */
.faq-v5 .faq-item{padding:14px 0;border-bottom:1px dashed var(--line);margin:0}
.faq-v5 .faq-no{border-radius:6px}
.faq-v5 .faq-item:last-child{border-bottom:none}

/* ---------- 标签 ---------- */
.art-tags{margin-top:30px;padding-top:20px;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.at-label{font-size:13px;color:var(--muted);margin-right:4px}
.at-chip{font-size:12.5px;background:#eef3ff;color:var(--blue);padding:5px 12px;border-radius:999px;transition:all .15s}
.at-chip:hover{background:var(--blue);color:#fff}

/* ---------- 列表页 SEO H1+P ---------- */
.list-head{padding:24px 4px 18px}
.list-head h1{font-size:24px;font-weight:800}
.list-head h1 em{font-style:normal;color:var(--blue)}
.list-head p{color:var(--muted);font-size:13.5px;margin-top:6px}

/* ---------- 分页（蓝色激活态） ---------- */
.pagination{display:flex;justify-content:center;gap:8px;flex-wrap:wrap;margin:34px 0 10px}
.pg-btn{min-width:36px;height:36px;padding:0 12px;display:inline-flex;align-items:center;justify-content:center;
  background:#fff;border:1px solid var(--line);border-radius:8px;font-size:13.5px;color:#4b5563}
.pg-btn:hover{border-color:var(--blue);color:var(--blue)}
.pg-btn.active{background:var(--blue);border-color:var(--blue);color:#fff;font-weight:600}
.pg-dots{height:36px;display:inline-flex;align-items:center;color:var(--muted)}

/* ---------- 页脚 ---------- */
.site-footer{border-top:1px solid var(--line);background:#fff;padding:22px 20px;text-align:center;color:var(--muted);font-size:13px}

/* ---------- 布局变体：确保每个文章页面排版不同 ---------- */
/* v1 默认：左对齐紧凑 */
.layout-1 .art-content{font-size:15.5px;line-height:1.9}
/* v2 大字号宽松 */
.layout-2 .art-content{font-size:16.5px;line-height:2.05;letter-spacing:.2px}
.layout-2 .art-intro{border-left:4px solid var(--blue);border-radius:0 10px 10px 0;background:#f5f5f6}
.layout-2 .art-title{font-size:30px}
/* v3 居中窄栏 */
.layout-3 .art-content{max-width:860px;margin-left:auto;margin-right:auto;font-size:15.5px}
.layout-3 .art-intro{text-align:center;background:#f5f5f6;border:1px solid #ececef}
.layout-3 .art-sec-title{text-align:center;border-left:none;padding-left:0}
.layout-3 .art-sec-title::after{content:"";display:block;width:44px;height:3px;border-radius:2px;background:var(--blue);margin:10px auto 0}
/* v4 杂志风：衬线标题+浅色段落背景 */
.layout-4 .art-title{font-size:26px;letter-spacing:.5px}
.layout-4 .art-content p:nth-child(even){background:#fafbfd;border-radius:10px;padding:12px 16px;margin:0 0 14px}
.layout-4 .art-content{font-size:15px;line-height:1.85}
/* v5 深色标题+无卡片感 */
.layout-5 .article-main{background:#fff;border-radius:14px}
.layout-5 .art-title{color:#111;font-size:29px}
.layout-5 .art-content{font-size:15.5px;line-height:2;color:#2b3138}
.layout-5 .art-sec-title{border-left-color:#111}
.layout-5 .at-chip{background:#111;color:#fff}
.layout-5 .at-chip:hover{background:var(--blue)}

/* ============================================================
   响应式：移动端一排两个工具，图标25x25，图标在左标题在右
   ============================================================ */
@media (max-width:1600px){
  .tool-grid{grid-template-columns:repeat(6,1fr);gap:16px 14px}
  .tool-card{width:auto;min-width:0;height:68px}
}
@media (max-width:1200px){
  .tool-grid{grid-template-columns:repeat(4,1fr)}
}
@media (max-width:900px){
  .tool-grid{grid-template-columns:repeat(3,1fr)}
}
@media (max-width:768px){
  .page-container{padding:14px 12px 40px}
  .sh-inner{padding:0 12px;gap:12px}
  .site-logo{font-size:16px}

  /* 移动端：一排两个，图标25x25，图标在左、标题在右 */
  .tool-grid{grid-template-columns:repeat(2,1fr);gap:10px}
  .ti-pc{display:none}
  .tool-card{display:block;height:auto;min-height:84px;padding:10px}
  .tc-body{display:block;height:auto}
  .tc-head{display:flex;align-items:center;gap:8px}
  .tc-title{flex:1;min-width:0;font-size:14px}
  .tc-desc{margin-top:7px;font-size:13px}
  .tc-meta{margin-top:7px;font-size:12px}

  .article-wrap{flex-direction:column}
  .article-main{padding:22px 16px 30px;max-width:none;width:100%}
  .article-side{width:100%;position:static}
  .art-title{font-size:22px}
  .faq-v3 .faq-list{grid-template-columns:1fr}
}

/* ===== 内容页：400 站点预览图 / 唯一出站跳转按钮 / FAQ首句 ===== */
/* 入口区用 flex 列布局严格居中：全局 img{display:block} 会让 text-align 居中失效 */
.art-entry{display:flex;flex-direction:column;align-items:center;margin:22px 0 30px;}
.art-entry .art-preview{width:100%;margin:0 auto 16px;display:flex;justify-content:center;}
.art-preview{display:flex;justify-content:center;}
.art-preview img{margin:0 auto;}
.art-preview img{width:auto;height:auto;max-width:400px;max-height:400px;border:1px solid var(--line);border-radius:14px;background:#fff;padding:8px;box-shadow:0 10px 28px -20px rgba(15,23,42,.35);}
.art-meta{margin:12px auto 0;display:flex;justify-content:center;flex-wrap:wrap;gap:8px 22px;font-size:13px;color:#8b91a0;}
.art-meta .meta-item{display:inline-flex;align-items:center;white-space:nowrap;}
.art-meta .visit-num{color:var(--blue);font-weight:700;font-size:15px;margin:0 3px;}
.jump-btn{display:inline-block;padding:13px 36px;border-radius:10px;background:var(--blue);color:#fff;font-size:16px;font-weight:700;box-shadow:0 10px 22px -12px rgba(48,80,220,.65);transition:all .2s;}
.jump-btn:hover{filter:brightness(1.06);transform:translateY(-1px);color:#fff;}
.jump-note{margin:10px auto 0;max-width:520px;font-size:12.5px;color:#9aa0ae;line-height:1.7;}
.faq-lead{color:#1f2430;font-weight:700;}
@media(max-width:768px){
  .art-preview img{max-width:100%;max-height:60vh;width:auto;height:auto;}
  .jump-btn{padding:12px 26px;font-size:15px;min-height:46px}
  .art-meta{gap:6px 14px;font-size:13px}
}

/* ===== 移动端可读性/可访问性增强：正文≥16px、辅助≥12px、触摸目标≥44px ===== */
@media (max-width:768px){
  body{font-size:16px}
  .site-logo{font-size:17px}
  .cat-item{display:inline-flex;align-items:center;min-height:40px;padding:8px 14px;font-size:14px}
  .art-content,.layout-1 .art-content,.layout-2 .art-content,.layout-3 .art-content,.layout-4 .art-content,.layout-5 .art-content{font-size:16px !important;line-height:1.85}
  .art-content img{max-width:100% !important;height:auto !important}
  .art-intro{font-size:14px}
  .faq-a{font-size:14px}
  .jump-note{font-size:13px}
  .art-meta{font-size:13px}
  .sc-title{font-size:13px}
  .sc-meta{font-size:12px}
  .at-chip{font-size:13px;min-height:38px;display:inline-flex;align-items:center}
}

/* ===== Category aggregation: top ranking + SEO long copy ===== */
.cat-rank{background:#fff;border:1px solid #eef0f3;border-radius:10px;padding:16px 18px;margin:18px 0 8px}
.cat-rank-h{font-size:18px;line-height:1.4;margin:0 0 12px;color:#1f2733}
.rank-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 22px}
.rank-item{display:flex;align-items:center;gap:10px;min-width:0}
.rank-no{flex:0 0 24px;width:24px;height:24px;border-radius:6px;background:#f0f3f8;color:#8a929c;font-size:13px;font-weight:700;display:inline-flex;align-items:center;justify-content:center}
.rank-no.rank-top{background:#2f6bff;color:#fff}
.rank-item:nth-child(2) .rank-no.rank-top{background:#3f7bff}
.rank-item:nth-child(3) .rank-no.rank-top{background:#6f97ff}
.rank-link{display:flex;align-items:baseline;gap:8px;min-width:0;flex:1;padding:4px 0;border-bottom:1px dashed #f0f1f4}
.rank-link:hover .rank-name{color:#2f6bff}
.rank-name{font-size:15px;font-weight:600;color:#1f2733;white-space:nowrap}
.rank-desc{font-size:13px;color:#9aa1ab;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0}
.cat-seo{background:#fff;border:1px solid #eef0f3;border-radius:10px;padding:20px 22px;margin:22px 0 8px}
.cat-seo-h{font-size:19px;line-height:1.4;margin:0 0 12px;color:#1f2733}
.cat-seo-text p{font-size:15px;line-height:1.9;color:#444c56;margin:0 0 10px}
.cat-seo-text p:last-child{margin-bottom:0}
@media (max-width:768px){
  .cat-rank{padding:14px;margin:14px 0 6px;border-radius:8px}
  .cat-rank-h{font-size:17px}
  .rank-list{grid-template-columns:1fr;gap:6px}
  .rank-link{padding:6px 0}
  .rank-name{font-size:15px}
  .cat-seo{padding:16px;border-radius:8px;margin:16px 0 6px}
  .cat-seo-h{font-size:18px}
  .cat-seo-text p{font-size:15px;line-height:1.85}
}
/* ===== Visible breadcrumb ===== */
.breadcrumb{margin:0 0 6px}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;align-items:center;gap:0;margin:0;padding:0;font-size:13px;color:#9aa1ab}
.breadcrumb li{display:inline-flex;align-items:center;min-width:0}
.breadcrumb li+li::before{content:"/";margin:0 7px;color:#c4cad3}
.breadcrumb a{color:#5a6470;text-decoration:none}
.breadcrumb a:hover{color:#2f6bff}
.breadcrumb .bc-cur{color:#9aa1ab;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:60vw}

/* ===== Article: prev / next + related ===== */
.art-postnav{margin-top:26px;padding-top:22px;border-top:1px solid #eef0f3;display:grid;grid-template-columns:1fr 1fr;gap:14px}
.pn-item{display:flex;flex-direction:column;gap:6px;min-width:0;padding:14px 16px;border:1px solid #eef0f3;border-radius:10px;background:#fafbfd}
.pn-next{align-items:flex-end;text-align:right}
.pn-dir{font-size:12.5px;color:#9aa1ab;line-height:1}
.pn-title{font-size:14.5px;font-weight:600;color:#1f2733;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
a.pn-title:hover{color:#2f6bff}
.pn-none{color:#b6bcc6;font-weight:400}
.pn-item.is-empty{background:transparent;border-style:dashed;min-height:64px}
.art-related{margin-top:28px}
.rel-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px 22px}
.rel-list li{min-width:0}
.rel-list a{display:block;padding:10px 12px;border-radius:8px;background:#f7f9fc;border:1px solid transparent;color:#33404f;font-size:14.5px;line-height:1.5;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.rel-list a:hover{color:#2f6bff;background:#eef3ff;border-color:#dbe6ff}

/* ===== List page: sort + filter toolbar ===== */
.list-tools{display:flex;align-items:center;gap:12px;margin:10px 0 14px;flex-wrap:wrap}
.sort-tabs{display:inline-flex;border:1px solid #e6e9ee;border-radius:8px;overflow:hidden;background:#fff}
.sort-tab{appearance:none;-webkit-appearance:none;border:0;background:transparent;padding:0 16px;font-size:14px;color:#5a6470;cursor:pointer;min-height:38px}
.sort-tab+.sort-tab{border-left:1px solid #e6e9ee}
.sort-tab.active{background:#2f6bff;color:#fff;font-weight:600}
.list-filter{flex:1;min-width:200px;height:38px;border:1px solid #e6e9ee;border-radius:8px;padding:0 12px;font-size:14px;background:#fff;color:#1f2733}
.list-filter:focus{outline:none;border-color:#2f6bff;box-shadow:0 0 0 2px rgba(47,107,255,.12)}
.list-filter-empty{color:#9aa1ab;font-size:14px;padding:30px 0;text-align:center}

@media (max-width:768px){
  .breadcrumb{margin-bottom:4px}
  .breadcrumb ol{font-size:12.5px}
  .breadcrumb .bc-cur{max-width:52vw}
  .art-postnav{grid-template-columns:1fr;gap:10px;margin-top:22px;padding-top:18px}
  .pn-next{align-items:flex-start;text-align:left}
  .pn-item{padding:12px 14px;min-height:0}
  .pn-item.is-empty{min-height:48px}
  .pn-title{font-size:14px}
  .art-related{margin-top:24px}
  .rel-list{grid-template-columns:1fr;gap:8px}
  .rel-list a{font-size:14px;padding:11px 12px;white-space:normal;min-height:44px;display:flex;align-items:center}
  .list-tools{gap:8px;margin:8px 0 12px}
  .sort-tabs{width:100%}
  .sort-tab{flex:1;padding:0 10px;min-height:44px;font-size:14px}
  .list-filter{flex-basis:100%;min-width:100%;order:2;height:44px;font-size:16px}
}