*{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#0b0d12;--bg-elev:#11141b;--card:#161a23;--card-hi:#1d222d;--card-top:#1a1f2a;
  --text:#e9ecf3;--text-2:#a8b0c2;--text-3:#6f7889;
  --line:#232936;--line-2:#2e3546;
  --accent:#5b8def;--accent-2:#8b5cf6;--accent-soft:rgba(91,141,239,.13);
  --ok:#34d399;--warn:#fbbf24;--err:#f87171;
  --r-sm:9px;--r:13px;--r-lg:18px;--r-xl:24px;
  --sh-1:0 1px 2px rgba(0,0,0,.3);
  --sh-2:0 8px 30px rgba(0,0,0,.35);
  --sh-3:0 24px 70px rgba(0,0,0,.5);
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
[data-theme=light]{
  --bg:#f6f7f9;--bg-elev:#fff;--card:#fff;--card-hi:#f4f6f9;--card-top:#fbfcfd;
  --text:#14171d;--text-2:#5a6373;--text-3:#8b95a5;
  --line:#e6e9ef;--line-2:#d8dde6;
  --accent:#2563eb;--accent-2:#7c3aed;--accent-soft:rgba(37,99,235,.09);
  --sh-1:0 1px 2px rgba(16,24,40,.05);
  --sh-2:0 6px 24px rgba(16,24,40,.08);
  --sh-3:0 20px 60px rgba(16,24,40,.12);
}
html{scroll-behavior:smooth;scroll-padding-top:90px}
body{font-family:var(--sans);background:var(--bg);color:var(--text);line-height:1.6;
  -webkit-font-smoothing:antialiased;transition:background .25s,color .25s}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer;border:none;background:none;color:inherit}
::selection{background:var(--accent);color:#fff}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--line-2);border-radius:10px;border:2px solid var(--bg)}
::-webkit-scrollbar-thumb:hover{background:var(--text-3)}

/* ============ 布局 ============ */
.layout{display:flex;min-height:100vh}
.sidebar{width:224px;flex-shrink:0;border-right:1px solid var(--line);background:var(--bg-elev);
  padding:20px 13px;position:sticky;top:0;height:100vh;overflow-y:auto;
  display:flex;flex-direction:column;gap:3px}
.main{flex:1;min-width:0;display:flex;flex-direction:column}

/* ============ 侧栏 ============ */
.brand{display:flex;align-items:center;gap:10px;padding:2px 9px 20px;font-weight:650;font-size:15px;letter-spacing:-.01em}
.brand-dot{width:10px;height:10px;border-radius:50%;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  box-shadow:0 0 0 3px var(--accent-soft),0 0 14px var(--accent)}
.nav-label{font-size:10.5px;color:var(--text-3);padding:16px 10px 7px;letter-spacing:.08em;text-transform:uppercase;font-weight:600}
.nav-item{display:flex;align-items:center;gap:9px;padding:8px 10px;border-radius:var(--r-sm);
  font-size:13.5px;color:var(--text-2);transition:all .16s;width:100%;text-align:left;position:relative;min-width:0}
.nav-item:hover{background:var(--card-hi);color:var(--text)}
.nav-item.active{background:var(--accent-soft);color:var(--accent);font-weight:550}
.nav-item.active::before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:3px;height:16px;border-radius:0 3px 3px 0;background:var(--accent)}
.nav-ico{width:18px;text-align:center;font-size:14px;flex-shrink:0}
.nav-count{margin-left:auto;font-size:11px;color:var(--text-3);background:var(--bg);
  padding:1px 7px;border-radius:20px;border:1px solid var(--line);font-variant-numeric:tabular-nums}
.sidebar-foot{margin-top:auto;padding:16px 9px 2px;border-top:1px solid var(--line);display:flex;gap:8px}

/* ============ 顶栏 ============ */
.topbar{display:flex;align-items:center;gap:12px;padding:13px 26px;
  border-bottom:1px solid var(--line);background:color-mix(in srgb,var(--bg-elev) 85%,transparent);
  backdrop-filter:blur(14px);position:sticky;top:0;z-index:30}
.crumb{font-size:13px;color:var(--text-3);display:flex;align-items:center;gap:7px;min-width:0}
.crumb a{transition:color .15s}
.crumb a:hover{color:var(--accent)}
.crumb b{color:var(--text);font-weight:550;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.crumb .sep{opacity:.4}
.spacer{flex:1}
.icon-btn{width:34px;height:34px;border-radius:var(--r-sm);border:1px solid var(--line);
  background:var(--card);display:flex;align-items:center;justify-content:center;
  font-size:15px;color:var(--text-2);transition:all .16s;flex-shrink:0}
.icon-btn:hover{color:var(--text);border-color:var(--accent);background:var(--card-hi);transform:translateY(-1px)}

/* ============ 搜索 ============ */
.searchbar{padding:22px 26px 0;position:relative;max-width:1400px;width:100%;margin:0 auto}
.searchbar input{width:100%;padding:13px 46px 13px 44px;border-radius:var(--r);
  border:1px solid var(--line);background:var(--card);color:var(--text);
  font-size:14px;outline:none;transition:all .2s;box-shadow:var(--sh-1)}
.searchbar input:focus{border-color:var(--accent);box-shadow:0 0 0 4px var(--accent-soft),var(--sh-1)}
.searchbar input::placeholder{color:var(--text-3)}
.s-ico{position:absolute;left:40px;top:50%;transform:translateY(-28%);color:var(--text-3);font-size:14px;pointer-events:none}
.s-kbd{position:absolute;right:40px;top:50%;transform:translateY(-28%);font-size:11px;color:var(--text-3);
  border:1px solid var(--line);padding:2px 7px;border-radius:5px;background:var(--bg);pointer-events:none;font-family:var(--mono)}

/* ============ 内容 ============ */
.content{padding:24px 26px 90px;flex:1;max-width:1400px;width:100%;margin:0 auto}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  padding:16px;display:flex;gap:13px;align-items:flex-start;
  transition:all .2s cubic-bezier(.4,0,.2,1);cursor:pointer;position:relative;overflow:hidden}
.card::after{content:"";position:absolute;inset:0;border-radius:var(--r);pointer-events:none;
  background:linear-gradient(135deg,var(--accent-soft),transparent 60%);opacity:0;transition:opacity .2s}
.card:hover{background:var(--card-hi);border-color:var(--line-2);transform:translateY(-3px);box-shadow:var(--sh-2)}
.card:hover::after{opacity:1}
.card:active{transform:translateY(-1px)}
.card-ico{width:40px;height:40px;border-radius:11px;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:600;
  background:linear-gradient(135deg,var(--accent-soft),rgba(139,92,246,.13));
  color:var(--accent);overflow:hidden;border:1px solid var(--line)}
.card-ico img{width:100%;height:100%;object-fit:cover}
.card-body{min-width:0;flex:1}
.card-title{font-size:14px;font-weight:560;display:flex;align-items:center;gap:7px;letter-spacing:-.005em;min-width:0}
.card-title>span:first-child{flex:1 1 auto;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.card-title>.badge-art,.card-title>.badge-link{flex:0 0 auto}
.card-desc{font-size:12px;color:var(--text-3);margin-top:4px;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:1.55}
.card-tags{display:flex;gap:5px;flex-wrap:wrap;margin-top:9px}
.tag{font-size:10.5px;padding:1.5px 8px;border-radius:20px;
  border:1px solid var(--line);color:var(--text-3);background:var(--bg);white-space:nowrap}
.badge-art{font-size:10px;padding:1px 7px;border-radius:20px;flex-shrink:0;font-weight:500;
  background:rgba(139,92,246,.14);color:#a78bfa;border:1px solid rgba(139,92,246,.28)}
.badge-link{font-size:10px;padding:1px 7px;border-radius:20px;flex-shrink:0;font-weight:500;
  background:var(--accent-soft);color:var(--accent);border:1px solid rgba(91,141,239,.28)}

/* ============ 分组 ============ */
.group{margin-bottom:34px}
.group-head{display:flex;align-items:center;gap:10px;margin-bottom:14px;min-width:0}
.group-title{font-size:14.5px;font-weight:620;letter-spacing:-.01em;display:flex;align-items:center;gap:8px;min-width:0;flex-shrink:0}
.group-n{font-size:11px;color:var(--text-3);background:var(--card);border:1px solid var(--line);
  padding:1.5px 8px;border-radius:20px;font-variant-numeric:tabular-nums}
.group-line{flex:1;height:1px;background:linear-gradient(90deg,var(--line),transparent)}

/* ============ 阅读进度条 ============ */
.progress{position:fixed;top:0;left:0;height:2.5px;z-index:100;
  background:linear-gradient(90deg,var(--accent),var(--accent-2));
  width:0;transition:width .1s linear;box-shadow:0 0 12px var(--accent)}

/* ============ 详情页通用 ============ */
.detail-wrap{max-width:1080px;margin:0 auto}

/* --- Hero --- */
.hero{position:relative;border-radius:var(--r-lg);padding:32px;margin-bottom:22px;
  background:var(--card-top);border:1px solid var(--line);overflow:hidden;box-shadow:var(--sh-1)}
.hero::before{content:"";position:absolute;top:-60%;right:-10%;width:420px;height:420px;border-radius:50%;
  background:radial-gradient(circle,var(--accent-soft),transparent 70%);pointer-events:none}
.hero::after{content:"";position:absolute;bottom:-70%;left:-5%;width:360px;height:360px;border-radius:50%;
  background:radial-gradient(circle,rgba(139,92,246,.1),transparent 70%);pointer-events:none}
.hero-inner{position:relative;z-index:1;display:flex;gap:20px;align-items:flex-start}
.hero-ico{width:64px;height:64px;border-radius:16px;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;font-size:28px;font-weight:600;
  background:linear-gradient(135deg,var(--accent-soft),rgba(139,92,246,.16));
  color:var(--accent);border:1px solid var(--line-2);box-shadow:var(--sh-1)}
.hero-main{flex:1;min-width:0}
.hero h1{font-size:26px;font-weight:680;letter-spacing:-.025em;line-height:1.25;margin-bottom:7px}
.hero-sub{font-size:14px;color:var(--text-2);line-height:1.6;max-width:640px}
.hero-tags{display:flex;gap:6px;flex-wrap:wrap;margin-top:13px}
.hero-tags .tag{font-size:11px;padding:2.5px 10px;background:var(--card);border-color:var(--line-2);color:var(--text-2)}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px;position:relative;z-index:1}

/* --- 按钮 --- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;border-radius:10px;
  font-size:13.5px;font-weight:550;transition:all .18s;white-space:nowrap;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;
  box-shadow:0 4px 14px rgba(91,141,239,.28)}
.btn:hover{filter:brightness(1.08);transform:translateY(-1.5px);box-shadow:0 7px 20px rgba(91,141,239,.38)}
.btn:active{transform:translateY(0)}
.btn-lg{padding:12px 22px;font-size:14px;border-radius:11px}
.btn-ghost{background:var(--card);color:var(--text-2);border:1px solid var(--line);box-shadow:none}
.btn-ghost:hover{background:var(--card-hi);color:var(--text);border-color:var(--line-2);
  transform:translateY(-1.5px);box-shadow:var(--sh-1);filter:none}
.btn-ok{background:linear-gradient(135deg,#10b981,#34d399);box-shadow:0 4px 14px rgba(52,211,153,.3)}

/* --- 区块卡片 --- */
.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  padding:24px;margin-bottom:16px}
.panel-head{display:flex;align-items:center;gap:9px;margin-bottom:16px;
  font-size:13px;font-weight:620;color:var(--text-2);letter-spacing:.02em;text-transform:uppercase}
.panel-head::before{content:"";width:3px;height:14px;border-radius:2px;
  background:linear-gradient(180deg,var(--accent),var(--accent-2))}
.panel p{font-size:14.5px;color:var(--text-2);line-height:1.8}
.panel p+p{margin-top:11px}

/* --- 特性列表 --- */
.feat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:11px}
.feat{display:flex;gap:11px;padding:14px;border-radius:var(--r-sm);
  background:var(--bg-elev);border:1px solid var(--line);transition:all .18s}
.feat:hover{border-color:var(--line-2);background:var(--card-hi)}
.feat-ico{width:22px;height:22px;border-radius:6px;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;font-size:11px;
  background:rgba(52,211,153,.14);color:var(--ok);font-weight:700;margin-top:1px}
.feat-txt{font-size:13.5px;color:var(--text-2);line-height:1.6}

/* --- 信息表 --- */
.meta-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:1px;
  background:var(--line);border-radius:var(--r-sm);overflow:hidden;border:1px solid var(--line)}
.meta-cell{background:var(--card);padding:13px 16px}
.meta-k{font-size:11px;color:var(--text-3);margin-bottom:3px;letter-spacing:.03em}
.meta-v{font-size:13.5px;color:var(--text);font-weight:500;word-break:break-all}
.meta-v code{font-family:var(--mono);font-size:12.5px;color:var(--accent)}

/* ============ 文章页 ============ */
.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 200px;gap:64px;align-items:start}
.article-main{min-width:0;max-width:720px}
.article-hero{margin-bottom:34px;padding-bottom:28px;border-bottom:1px solid var(--line);position:relative}
.article-hero .kicker{display:inline-flex;align-items:center;gap:6px;font-size:11px;font-weight:650;
  color:var(--accent);background:var(--accent-soft);padding:5px 12px;border-radius:20px;margin-bottom:16px;
  letter-spacing:.04em;text-transform:none;border:1px solid rgba(91,141,239,.18)}
.article-hero h1{font-size:33px;font-weight:750;letter-spacing:-.035em;line-height:1.22;margin-bottom:14px;
  text-wrap:balance}
.article-hero .lead{font-size:15.5px;color:var(--text-2);line-height:1.72;margin-bottom:18px;max-width:640px}
.article-meta{display:flex;gap:0;flex-wrap:wrap;font-size:12px;color:var(--text-3);align-items:center}
.article-meta .m{display:flex;align-items:center;gap:5px;padding:4px 11px 4px 0}
.article-meta .m:first-child{padding-left:0}
.article-meta .dot{width:1px;height:11px;border-radius:0;background:var(--line-2);opacity:.8;margin:0 11px 0 0}

/* --- 目录 --- */
.toc{position:sticky;top:88px;max-height:calc(100vh - 130px);overflow-y:auto;
  border-left:1px solid var(--line);padding-left:16px;font-size:12.5px;scrollbar-width:thin}
.toc-t{font-size:10px;font-weight:750;color:var(--text-3);letter-spacing:.12em;
  text-transform:uppercase;margin-bottom:12px}
.toc a{display:block;padding:6px 8px 6px 10px;color:var(--text-3);line-height:1.45;
  border-left:2px solid transparent;margin-left:-18px;transition:all .16s;border-radius:0 5px 5px 0;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.toc a:hover{color:var(--text-2);background:var(--card-hi)}
.toc a.h3{padding-left:24px;font-size:12px;opacity:.85}
.toc a.on{color:var(--accent);border-left-color:var(--accent);font-weight:600;background:var(--accent-soft)}
.toc a.on.h3{opacity:1}
.toc-bar{display:none}
.toc-m{display:none}
@media(max-width:1080px){.toc-d{display:none}.toc-m{display:block}}

/* --- 正文排版 --- */
.article{font-size:16px;line-height:1.9;color:var(--text-2);letter-spacing:.006em}
.article>*:first-child{margin-top:0}

/* 二级标题：上方大留白 + 渐变竖条 + 细分隔线 */
.article h2{font-size:22px;font-weight:700;letter-spacing:-.022em;line-height:1.35;
  margin:52px 0 18px;padding-left:14px;position:relative;color:var(--text);scroll-margin-top:90px}
.article h2::before{content:"";position:absolute;left:0;top:.18em;width:3.5px;height:1.05em;
  border-radius:2px;background:linear-gradient(180deg,var(--accent),var(--accent-2))}
.article h2::after{content:"";position:absolute;left:0;right:0;bottom:-9px;height:1px;
  background:linear-gradient(90deg,var(--line) 0%,transparent 85%)}
.article h2:first-child{margin-top:0}

/* 三级标题 */
.article h3{font-size:17px;font-weight:650;margin:34px 0 12px;color:var(--text);
  letter-spacing:-.012em;line-height:1.45;scroll-margin-top:90px}
.article h4{font-size:15.5px;font-weight:650;margin:24px 0 10px;color:var(--text);scroll-margin-top:90px}

/* 段落：中文需要更明确的段间距 */
.article p{margin:0 0 18px;color:var(--text-2)}
.article p+p{margin-top:0}

/* 列表 */
.article ul,.article ol{margin:0 0 18px;padding-left:22px;color:var(--text-2)}
.article li{margin:8px 0;line-height:1.85;padding-left:2px}
.article li::marker{color:var(--accent);font-weight:700}
.article li>ul,.article li>ol{margin:8px 0 4px}

/* 强调 */
.article strong{font-weight:680;color:var(--text)}
.article em{font-style:italic;color:var(--text)}

/* 链接：下划线用 background-image 实现，不截断 */
.article a{color:var(--accent);text-decoration:none;transition:color .15s;
  background-image:linear-gradient(currentColor,currentColor);
  background-size:100% 1px;background-repeat:no-repeat;background-position:0 100%;
  padding-bottom:1px}
.article a:hover{color:var(--accent-2);background-size:100% 2px}

.article hr{border:none;height:1px;margin:44px 0;
  background:linear-gradient(90deg,transparent,var(--line-2) 15%,var(--line-2) 85%,transparent)}

/* 行内代码 */
.article code{background:var(--card-hi);padding:2px 6px;border-radius:5px;
  font-family:var(--mono);font-size:13px;color:#c084fc;border:1px solid var(--line);
  font-weight:500;letter-spacing:0;white-space:nowrap}
.article td code,.article th code{white-space:normal;word-break:break-word}

/* 代码块 */
.code-wrap{position:relative;margin:22px 0;border-radius:10px;overflow:hidden;
  border:1px solid var(--line);background:var(--bg-elev);box-shadow:0 1px 3px rgba(0,0,0,.04)}
.code-bar{display:flex;align-items:center;gap:8px;padding:9px 14px;
  background:linear-gradient(180deg,var(--card-hi),var(--card));border-bottom:1px solid var(--line)}
.code-dots{display:flex;gap:5px}
.code-dots i{width:8px;height:8px;border-radius:50%;display:block}
.code-dots i:nth-child(1){background:#ff5f57}
.code-dots i:nth-child(2){background:#febc2e}
.code-dots i:nth-child(3){background:#28c840}
.code-lang{font-size:11px;color:var(--text-3);font-family:var(--mono);letter-spacing:.04em;text-transform:uppercase}
.code-copy{margin-left:auto;font-size:11.5px;color:var(--text-3);padding:3px 9px;border-radius:5px;
  border:1px solid transparent;transition:all .15s;display:flex;align-items:center;gap:5px}
.code-copy:hover{color:var(--text);background:var(--card);border-color:var(--line)}
.code-wrap pre{margin:0;padding:18px 20px;overflow-x:auto;background:transparent;
  scrollbar-width:thin}
.code-wrap pre code{background:none;border:none;padding:0;color:var(--text);
  font-size:13.5px;line-height:1.75;font-family:var(--mono);display:block;letter-spacing:0}

/* 引用 */
.article blockquote{border-left:3px solid var(--accent);background:var(--accent-soft);
  padding:16px 20px;margin:22px 0;border-radius:0 8px 8px 0;
  color:var(--text-2);font-size:14.5px;line-height:1.8;position:relative}
.article blockquote p{margin:0;color:inherit}
.article blockquote p+p{margin-top:10px}
.article blockquote strong{color:var(--text)}
.article blockquote::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;
  background:linear-gradient(180deg,var(--accent),var(--accent-2))}

/* 表格 */
.table-wrap{margin:22px 0;border-radius:10px;overflow:auto;border:1px solid var(--line);
  box-shadow:0 1px 2px rgba(0,0,0,.03)}
.article table{width:100%;border-collapse:separate;border-spacing:0;font-size:13.5px;line-height:1.6}
.article th{background:linear-gradient(180deg,var(--card-hi),var(--card));padding:12px 16px;text-align:left;
  font-weight:680;font-size:12.5px;letter-spacing:.02em;color:var(--text);
  border-bottom:1px solid var(--line-2);white-space:nowrap;position:sticky;top:0;z-index:1}
.article td{padding:12px 16px;border-bottom:1px solid var(--line);color:var(--text-2);vertical-align:top}
.article tr:last-child td{border-bottom:none}
/* 斑马纹：偶数行浅底 */
.article tbody tr:nth-child(even) td{background:rgba(0,0,0,.018)}
.article tbody tr:hover td{background:var(--accent-soft)}
.article td code{font-size:12.5px}

/* --- 上下篇 --- */
.pager{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:56px;
  padding-top:32px;border-top:1px solid var(--line)}
.pager-btn{display:flex;flex-direction:column;gap:8px;padding:18px 20px;border-radius:12px;
  background:var(--card);border:1px solid var(--line);transition:all .2s;min-width:0;text-decoration:none}
.pager-btn:hover{background:var(--card-hi);border-color:var(--accent);transform:translateY(-2px);box-shadow:var(--sh-2)}
.pager-btn.next{text-align:right;align-items:flex-end}
.pager-lbl{font-size:11px;color:var(--text-3);display:flex;align-items:center;gap:5px;
  letter-spacing:.06em;min-width:0;font-weight:600;text-transform:none}
.pager-title{font-size:14.5px;font-weight:620;color:var(--text);line-height:1.45;
  white-space:normal;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;
  overflow:hidden;max-width:100%}
.pager-empty{opacity:.35;pointer-events:none}

/* --- 相关推荐 --- */
.related{margin-top:52px;padding-top:30px;border-top:1px solid var(--line)}
.related-t{font-size:13px;font-weight:680;color:var(--text-2);margin-bottom:18px;
  display:flex;align-items:center;gap:8px;text-transform:uppercase;letter-spacing:.03em}
.related-t::before{content:"";width:3px;height:13px;border-radius:2px;
  background:linear-gradient(180deg,var(--accent),var(--accent-2))}

/* --- 回到顶部 --- */
.to-top{position:fixed;right:26px;bottom:26px;width:42px;height:42px;border-radius:50%;
  background:var(--card);border:1px solid var(--line);color:var(--text-2);
  display:flex;align-items:center;justify-content:center;font-size:16px;
  box-shadow:var(--sh-2);z-index:40;opacity:0;pointer-events:none;
  transition:all .25s;transform:translateY(10px)}
.to-top.show{opacity:1;pointer-events:auto;transform:translateY(0)}
.to-top:hover{color:var(--accent);border-color:var(--accent);transform:translateY(-2px)}

/* --- 空态 --- */
.empty{text-align:center;padding:90px 20px;color:var(--text-3)}
.empty-ico{font-size:40px;margin-bottom:14px;opacity:.4}
.empty-t{font-size:15px;margin-bottom:6px;color:var(--text-2)}
.empty-s{font-size:13px;opacity:.8}

/* --- 提示条 --- */
.toast{position:fixed;left:50%;bottom:34px;transform:translate(-50%,20px);
  background:var(--card);border:1px solid var(--line-2);color:var(--text);
  padding:11px 20px;border-radius:11px;font-size:13.5px;box-shadow:var(--sh-3);
  z-index:200;opacity:0;pointer-events:none;transition:all .25s;display:flex;align-items:center;gap:8px}
.toast.show{opacity:1;transform:translate(-50%,0)}

/* ============ 移动端 ============ */
.menu-btn{display:none}
@media(max-width:1080px){
  .article-layout{grid-template-columns:1fr;gap:0}
  .toc{display:none}
  .toc-bar{display:block;margin-bottom:22px;border:1px solid var(--line);border-radius:var(--r-sm);
    background:var(--card);overflow:hidden}
  .toc-bar summary{padding:12px 16px;font-size:13px;font-weight:600;color:var(--text-2);
    cursor:pointer;list-style:none;display:flex;align-items:center;gap:8px}
  .toc-bar summary::-webkit-details-marker{display:none}
  .toc-bar summary::after{content:"▾";margin-left:auto;transition:transform .2s}
  .toc-bar[open] summary::after{transform:rotate(180deg)}
  .toc-bar .toc{position:static;max-height:none;border-left:none;padding:0 16px 14px;display:block}
  .toc-bar .toc-m{display:block}
  .toc-bar .toc a{margin-left:0;border-left:2px solid transparent;padding-left:10px}
  .toc-bar .toc a.on{border-left-color:var(--accent)}
  .toc-bar .toc-t{display:none}
}
@media(max-width:860px){
  .sidebar{position:fixed;left:0;top:0;bottom:0;z-index:70;transform:translateX(-100%);
    transition:transform .25s cubic-bezier(.4,0,.2,1);box-shadow:var(--sh-3)}
  .sidebar.open{transform:translateX(0)}
  .menu-btn{display:flex}
  .content{padding:18px 15px 80px}
  .searchbar{padding:16px 15px 0}
  .s-ico{left:29px}.s-kbd{right:29px;display:none}
  .grid{grid-template-columns:repeat(auto-fill,minmax(158px,1fr));gap:10px}
  .card{padding:13px;gap:10px;flex-direction:column;align-items:stretch}
  .card-ico{width:34px;height:34px;font-size:15px;border-radius:9px;margin-bottom:2px}
  /* 手机上标题独占整行（徽标挤占宽度会导致标题只剩 104px），最多两行 */
  .card-title{font-size:13.5px;display:block;line-height:1.38}
  .card-title>span:first-child{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;
    overflow:hidden;white-space:normal;word-break:break-word;overflow-wrap:anywhere}
  .card-title>.badge-art,.card-title>.badge-link{display:inline-block;margin-top:5px}
  .card-desc{-webkit-line-clamp:2;font-size:11.5px}
  .topbar{padding:11px 15px}
  .hero{padding:22px 18px;border-radius:var(--r)}
  .hero-inner{gap:14px;flex-wrap:wrap}
  .hero-ico{width:52px;height:52px;font-size:23px;border-radius:13px}
  .hero h1{font-size:21px}
  .hero-sub{font-size:13.5px}
  .hero-actions{gap:8px}
  .btn{padding:9px 15px;font-size:13px}
  .btn-lg{padding:10px 17px;font-size:13.5px}
  .panel{padding:18px 16px}
  .article{font-size:15px}
  .article h2{font-size:19px;margin:30px 0 12px}
  .article h2::before{left:-10px}
  .article h3{font-size:15.5px}
  .article-hero h1{font-size:23px}
  .article-hero .lead{font-size:14px}
  .feat-grid{grid-template-columns:1fr}
  .meta-grid{grid-template-columns:1fr 1fr}
  .pager{grid-template-columns:1fr;gap:10px}
  .pager-btn.next{text-align:left;align-items:flex-start}
  .to-top{right:16px;bottom:16px;width:38px;height:38px}
  .mask{position:fixed;inset:0;background:rgba(0,0,0,.55);z-index:65;display:none;backdrop-filter:blur(2px)}
  .mask.on{display:block}
  .article-layout{gap:0}
}
@media print{
  .sidebar,.topbar,.searchbar,.toc,.toc-bar,.pager,.related,.to-top,.progress,.menu-btn{display:none!important}
  body{background:#fff;color:#000}
  .article-layout{grid-template-columns:1fr}
  .content{padding:0;max-width:none}
}

/* ============ 移动端加固 ============ */
html,body{max-width:100%;overflow-x:hidden}
@media(max-width:860px){
  /* 长英文/URL 不撑破容器 */
  .card-title>span:first-child,.card-desc,.article p,.article li,
  .hero h1,.hero-sub,.meta-v,.feat-txt,.pager-title{word-break:break-word;overflow-wrap:anywhere}
  /* 搜索框在窄屏别被键盘按钮挡住 */
  .searchbar input{font-size:16px} /* iOS 输入框 <16px 会强制放大页面 */
  /* 表格横向滚动而不是撑破页面 */
  .article table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch}
  /* 代码块横向滚动 */
  .article pre{overflow-x:auto;-webkit-overflow-scrolling:touch}
  /* 标签不换行撑破 */
  .tag{max-width:100%;overflow:hidden;text-overflow:ellipsis}
}
@media(max-width:520px){
  .grid{grid-template-columns:1fr 1fr;gap:9px}
  .card{padding:11px;gap:8px}
  .card-title{font-size:13px;gap:5px}
  .badge-art,.badge-link{font-size:9px;padding:1px 5px}
  .card-desc{font-size:11px}
  .group-title{font-size:13.5px}
  .group-n{font-size:10px}
}