/* ============================================================
   AI 导航 · 编辑部风格样式表 (v5)
   纸质底色 + 白纸张 + 细线分隔 + 克制的强调色
   ============================================================ */
:root{
  --paper:#f4f2ee;
  --sheet:#fffefc;
  --ink:#1a1815;
  --ink2:#46423d;
  --muted:#847e76;
  --faint:#a8a29a;
  --line:#e2ded6;
  --line2:#cfc9be;
  --brand:#a8442a;
  --brand-2:#c4623f;
  --brand-soft:#f6ece7;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--paper);color:var(--ink2);
  font-family:var(--sans);font-size:15.5px;line-height:1.85;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
h1,h2,h3,h4,h5,h6{color:var(--ink)}
.wrap{max-width:1160px;margin:0 auto;padding:0 22px}

/* ---------- 顶栏 ---------- */
.site-head{background:var(--paper);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.site-head .wrap{display:flex;align-items:center;gap:22px;height:58px}
.brand{display:flex;align-items:center;gap:9px;font-weight:700;font-size:15.5px;letter-spacing:.01em;color:var(--ink)}
.brand .dot{
  width:24px;height:24px;border-radius:4px;background:var(--ink);color:var(--paper);
  display:grid;place-items:center;font-size:11px;font-weight:800;letter-spacing:.02em;
}
.head-nav{display:flex;gap:2px;margin-left:auto}
.head-nav a{padding:6px 11px;border-radius:4px;color:var(--muted);font-size:13.5px;transition:.15s}
.head-nav a:hover{background:#eae6df;color:var(--ink)}

/* ---------- 首页 hero ---------- */
.hero{background:var(--paper);border-bottom:1px solid var(--line);padding:56px 0 44px}
.hero h1{margin:0 0 12px;font-size:38px;line-height:1.24;letter-spacing:-.02em;font-weight:750}
.hero p{margin:0 0 26px;max-width:620px;color:var(--muted);font-size:15px;line-height:1.85}
.search-box{
  display:flex;align-items:center;gap:12px;max-width:600px;
  background:var(--sheet);border:1px solid var(--line2);border-radius:6px;padding:12px 14px;
}
.search-box .ico{font-size:12px;letter-spacing:.12em;color:var(--faint);
  border-right:1px solid var(--line);padding-right:12px;text-transform:uppercase}
.search-box input{flex:1;border:0;outline:0;background:none;color:var(--ink);
  font-size:14.5px;font-family:inherit}
.search-box input::placeholder{color:var(--faint)}
#q{width:100%}
.chips{display:flex;flex-wrap:wrap;gap:7px;margin-top:22px}
.chip{padding:5px 12px;border-radius:4px;border:1px solid var(--line2);
  font-size:13px;color:var(--ink2);background:var(--sheet);transition:.15s}
.chip:hover{border-color:var(--ink2);color:var(--ink)}
.chip.on{background:var(--ink);border-color:var(--ink);color:var(--paper)}
.chip b{font-weight:700;opacity:.55;margin-left:4px}

/* ---------- 区块 ---------- */
.section{padding:38px 0 8px}
.section-head{display:flex;align-items:baseline;gap:12px;margin-bottom:18px;
  padding-bottom:11px;border-bottom:1px solid var(--line2)}
.section-head h2{margin:0;font-size:21px;letter-spacing:-.01em;font-weight:700}
.section-head .count{font-size:12.5px;color:var(--faint)}
.section-head .more{margin-left:auto;font-size:13px;color:var(--brand)}
.section-head .more:hover{text-decoration:underline}

/* ---------- 工具卡片 ---------- */
.tgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(268px,1fr));gap:18px}
.tcard{display:block;background:var(--sheet);border:1px solid var(--line);
  border-radius:6px;overflow:hidden;transition:border-color .16s,background .16s}
.tcard:hover{border-color:var(--line2);background:#fff}
.tcard:hover .tb b{color:var(--brand)}
.tcard .thumb{display:block;aspect-ratio:16/10;background:#eeebe5;overflow:hidden;
  border-bottom:1px solid var(--line)}
.tcard .thumb img{width:100%;height:100%;object-fit:cover;object-position:top center}
.thumb.ph{display:grid;place-items:center;font-family:var(--mono);font-size:30px;
  font-weight:700;color:#b8b0a4;background:#eeebe5}
.tcard .tb{display:block;padding:13px 15px 15px}
.tcard .tb b{display:block;font-size:15px;font-weight:700;color:var(--ink);margin-bottom:3px;
  letter-spacing:-.01em;transition:color .16s}
.tcard .tb i{display:block;font-style:normal;font-size:13px;color:var(--muted);line-height:1.65;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.tcard .tb b .bdg{display:inline-block;margin-left:7px;padding:0 5px;border-radius:3px;
  font-size:10.5px;font-weight:600;font-style:normal;letter-spacing:.04em;
  color:#8a7f6d;background:#f0ece4;border:1px solid var(--line);vertical-align:2px}

/* 首页分组 */
.hgroup{margin-bottom:36px}
.hgroup .ghead{display:flex;align-items:baseline;gap:12px;margin-bottom:16px;
  padding-bottom:10px;border-bottom:1px solid var(--line)}
.hgroup .ghead b{font-size:18.5px;font-weight:700;letter-spacing:-.01em}
.hgroup .ghead i{font-style:normal;font-family:var(--mono);font-size:11.5px;color:var(--faint);
  letter-spacing:.06em}
.hgroup .ghead .gdesc{font-size:12.5px;color:var(--faint)}
.hgroup .ghead a{margin-left:auto;font-size:12.5px;color:var(--brand)}
.hgroup .ghead a:hover{text-decoration:underline}

/* 全部工具条 */
.alltools{background:var(--sheet);border:1px solid var(--line);border-radius:6px;
  padding:20px 22px;margin-bottom:34px}
.alltools h4{margin:0 0 13px;font-size:11.5px;font-weight:700;letter-spacing:.1em;
  color:var(--faint);text-transform:uppercase}
.atlist{display:flex;flex-wrap:wrap;gap:6px}
.atlist a{font-size:13px;padding:4px 10px;border-radius:4px;border:1px solid transparent;
  color:var(--ink2);transition:.15s}
.atlist a:hover{border-color:var(--line2);background:#f7f5f1}
.atlist a.on{background:var(--ink);border-color:var(--ink);color:var(--paper)}
.atlist-side{flex-direction:column;gap:0}
.atlist-side a{padding:7px 0;border-radius:0;border-bottom:1px solid var(--line);font-size:13.5px}
.atlist-side a:last-child{border-bottom:0}
.atlist-side a.on{background:none;color:var(--brand);font-weight:650;border-color:var(--line)}

/* ---------- 详情页 hero ---------- */
.hero2{padding:30px 0 34px;border-bottom:1px solid var(--line);background:var(--paper)}
.hero2 .crumb{font-size:12.5px;color:var(--faint);letter-spacing:.02em;margin-bottom:24px}
.hero2 .crumb a{color:var(--muted)}
.hero2 .crumb a:hover{color:var(--brand)}
.hero2 .crumb span{margin:0 7px;color:var(--line2)}
.hero2 .top{display:grid;grid-template-columns:minmax(0,1fr) 460px;gap:48px;align-items:center}
.hero2 .h-main{min-width:0}
.hero2 .ttl{display:flex;align-items:center;gap:18px;margin-bottom:16px}
.hero2 .logo-xl{width:68px;height:68px;flex:0 0 68px;border-radius:8px;background:var(--sheet);
  border:1px solid var(--line);object-fit:contain;padding:9px}
.hero2 .ttl-t{min-width:0}
.hero2 h1{margin:0 0 6px;font-size:36px;line-height:1.18;letter-spacing:-.025em;font-weight:780}
.hero2 .tagline{margin:0;font-size:15.5px;line-height:1.7;color:var(--muted)}
.hero2 .facts{display:flex;flex-wrap:wrap;gap:6px 20px;margin:0 0 22px;
  font-size:13px;color:var(--muted)}
.hero2 .fact b{color:var(--ink);font-weight:600}
.hero2 .cta{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.btn-white{display:inline-flex;align-items:center;gap:8px;background:var(--ink);color:var(--paper);
  font-weight:600;font-size:14.5px;padding:11px 22px;border-radius:5px;transition:.16s}
.btn-white:hover{background:#000}
.btn-ghost{display:inline-flex;align-items:center;gap:8px;color:var(--ink2);font-size:14px;
  padding:10px 16px;border-radius:5px;border:1px solid var(--line2);background:var(--sheet);transition:.16s}
.btn-ghost:hover{border-color:var(--ink2);color:var(--ink)}
.btn{display:inline-flex;align-items:center;gap:7px;background:var(--ink);color:var(--paper);
  font-weight:600;font-size:14.5px;padding:11px 22px;border-radius:5px;transition:.16s}
.btn:hover{background:#000}

/* 官网截图 */
.shot{margin:0}
.shot img{width:100%;height:auto;border:1px solid var(--line2);border-radius:5px;background:#fff}
.shot figcaption{margin-top:9px;font-size:12px;color:var(--faint);letter-spacing:.01em}
@media(max-width:1080px){
  .hero2 .top{grid-template-columns:1fr;gap:30px}
  .shot{max-width:660px}
}

/* ---------- 正文纸张 ---------- */
.art{padding:26px 0 20px}
.detail-wrap{display:grid;grid-template-columns:minmax(0,1fr) 268px;gap:40px;align-items:start}
@media(max-width:1020px){.detail-wrap{grid-template-columns:1fr;gap:26px}}
main{background:var(--sheet);border:1px solid var(--line);border-radius:6px;
  padding:10px 40px 34px}
.sec{border-top:1px solid var(--line);padding:30px 0 32px;scroll-margin-top:76px}
.sec:first-child{border-top:0;padding-top:24px}
.sec h2{display:flex;align-items:baseline;gap:12px;margin:0 0 18px;
  font-size:20px;line-height:1.5;letter-spacing:-.01em;font-weight:700}
.sec h2 .sn{font-family:var(--mono);font-size:11.5px;font-weight:600;letter-spacing:.1em;
  color:var(--brand);flex:0 0 auto;padding-top:2px}
.sec-sub{margin:-8px 0 18px;font-size:14px;color:var(--muted);line-height:1.85}
.sec p{margin:0 0 15px;font-size:15.5px;line-height:1.95;color:var(--ink2)}
.sec p:last-child{margin-bottom:0}
.sec strong{color:var(--ink);font-weight:650}

/* 功能 / 场景：细线定义列表 */
.fgrid{display:grid;grid-template-columns:1fr 1fr;gap:6px 34px}
.fcard{border-left:2px solid var(--line);padding:6px 0 8px 15px}
.fcard:hover{border-left-color:var(--brand)}
.fcard .ft{margin:0 0 3px;font-size:14.8px;font-weight:700;color:var(--ink)}
.fcard .fd{margin:0;font-size:14px;line-height:1.8;color:var(--muted)}

/* 步骤 */
.steps{counter-reset:st;margin:0;padding:0;list-style:none}
.steps li{counter-increment:st;position:relative;padding:0 0 18px 42px}
.steps li:before{content:counter(st,decimal-leading-zero);position:absolute;left:0;top:2px;
  font-family:var(--mono);font-size:12px;color:var(--faint);letter-spacing:.06em}
.steps li:last-child{padding-bottom:0}
.steps .st{display:block;font-size:14.8px;font-weight:700;color:var(--ink);margin-bottom:3px}
.steps .sd{display:block;font-size:14.2px;line-height:1.8;color:var(--muted)}

/* 表格 */
.ptable,.stable{width:100%;border-collapse:collapse;font-size:14.2px}
.ptable th,.stable th{text-align:left;padding:9px 12px 9px 0;font-size:11.5px;font-weight:700;
  color:var(--faint);letter-spacing:.08em;text-transform:uppercase;
  border-bottom:1px solid var(--line2)}
.ptable td,.stable td{padding:12px 12px 12px 0;border-bottom:1px solid var(--line);
  line-height:1.8;color:var(--ink2);vertical-align:top}
.ptable tr:last-child td,.stable tr:last-child td{border-bottom:0}
.ptable td:first-child{font-weight:650;color:var(--ink);white-space:nowrap}
.ptable .price{color:var(--brand);font-weight:650;white-space:nowrap;
  font-family:var(--mono);font-size:13.5px}
.stable td:first-child{font-family:var(--mono);font-size:13px;font-weight:600;
  color:var(--ink);white-space:nowrap}
.pnote{margin:12px 0 0;font-size:12.5px;color:var(--faint);line-height:1.7}

/* 官网入口 */
.official{border:1px solid var(--line2);border-radius:6px;padding:28px 26px;text-align:center;
  background:#faf8f4}
.official .lbl{margin:0 0 8px;font-size:12px;color:var(--faint);letter-spacing:.06em}
.official .dom{margin:0 0 18px;font-size:25px;font-weight:750;letter-spacing:-.01em;
  color:var(--ink);font-family:var(--mono)}
.official .btn{position:static}

/* FAQ */
.faq details{border-bottom:1px solid var(--line);padding:14px 0}
.faq details:last-child{border-bottom:0}
.faq details[open]{padding-bottom:18px}
.faq summary{cursor:pointer;font-weight:650;font-size:14.8px;color:var(--ink);list-style:none;
  display:flex;justify-content:space-between;gap:16px;align-items:flex-start;line-height:1.7}
.faq summary::-webkit-details-marker{display:none}
.faq summary:after{content:"＋";flex:0 0 auto;color:var(--faint);font-size:14px;font-weight:400}
.faq details[open] summary:after{content:"－"}
.faq .ans{margin:9px 0 0;font-size:14.2px;line-height:1.9;color:var(--muted)}

/* 类似工具 */
.relgrid{display:grid;grid-template-columns:1fr 1fr;gap:0 34px}
.card{display:flex;gap:12px;align-items:flex-start;padding:13px 0;
  border-bottom:1px solid var(--line)}
.relgrid .card:nth-last-child(-n+2){border-bottom:0}
.card:hover .name{color:var(--brand)}
.card .logo{width:38px;height:38px;flex:0 0 38px;border-radius:6px;border:1px solid var(--line);
  background:#fff;object-fit:contain;padding:5px}
.card .body{min-width:0;flex:1}
.card .name{margin:0 0 2px;font-size:14.5px;font-weight:700;color:var(--ink);transition:.15s;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.card .tag{margin:0;font-size:12.8px;line-height:1.65;color:var(--muted);
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.card .cat{display:none}

/* 两栏对比 */
.cmp2{display:grid;grid-template-columns:1fr 1fr;gap:0 34px;margin-top:20px}
.cmp2 .col{padding:2px 0 2px 15px;border-left:2px solid var(--line)}
.cmp2 .col.good{border-left-color:#8fae7a}
.cmp2 .col.bad{border-left-color:#cb8a63}
.cmp2 .col h5{margin:0 0 9px;font-size:12px;font-weight:700;letter-spacing:.08em;
  color:var(--faint);text-transform:uppercase}
.cmp2 .col h5 span{display:none}
.cmp2 ul{margin:0;padding-left:16px}
.cmp2 li{font-size:14px;line-height:1.8;color:var(--ink2);margin-bottom:4px}
.cmp2 li:last-child{margin-bottom:0}

/* 代码块 */
pre.code{margin:0 0 12px;padding:16px 18px;border-radius:5px;overflow-x:auto;
  background:#26231f;color:#e7e2d8;font-size:12.8px;line-height:1.9;
  font-family:var(--mono);white-space:pre-wrap;word-break:break-word}
pre.code b{color:#f0b38a;font-weight:600}
pre.code i{color:#8d857a;font-style:normal}
pre.code u{color:#a9c48a;text-decoration:none}
.codetip{margin:0;font-size:12.5px;color:var(--faint);line-height:1.75}

/* 关键词胶囊 */
.chips2{display:flex;flex-wrap:wrap;gap:6px}
.chips2 span{font-size:13px;padding:4px 11px;border-radius:4px;background:#f5f2ed;
  border:1px solid var(--line);color:var(--ink2);line-height:1.6}
.chips2 span b{color:var(--ink);font-weight:650;margin-right:6px}
.chips2 span em{font-style:normal;color:var(--faint);margin-left:6px;font-size:12px}

/* 时间线 */
.tl{margin:0;padding:0 0 0 18px;list-style:none;border-left:1px solid var(--line2)}
.tl li{position:relative;padding:0 0 16px 0;font-size:14.2px;line-height:1.85;color:var(--muted)}
.tl li:last-child{padding-bottom:0}
.tl li:before{content:"";position:absolute;left:-22px;top:9px;width:5px;height:5px;
  border-radius:50%;background:var(--brand)}
.tl b{display:block;color:var(--ink);font-size:14.2px;font-family:var(--mono);
  font-weight:600;letter-spacing:.02em;margin-bottom:1px}

/* 流程 */
.flow{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:18px}
.flow .fl{padding-left:13px;border-left:2px solid var(--line)}
.flow .fl h6{margin:0 0 3px;font-size:14px;font-weight:700;color:var(--ink)}
.flow .fl p{margin:0;font-size:13.2px;line-height:1.8;color:var(--muted)}

/* ---------- 侧栏 ---------- */
.side{position:sticky;top:78px;display:flex;flex-direction:column;gap:26px}
@media(max-width:1020px){.side{position:static;margin:6px 0 24px}}
.side-card{background:transparent;border:0;border-radius:0;padding:0}
.side-card h4{margin:0 0 10px;padding-bottom:9px;font-size:11.5px;font-weight:700;
  letter-spacing:.12em;color:var(--faint);text-transform:uppercase;
  border-bottom:1px solid var(--line2)}
.side-card .toc-link{display:block;padding:5px 0 5px 11px;border-left:1px solid var(--line);
  font-size:13.3px;line-height:1.6;color:var(--muted);transition:.15s}
.side-card .toc-link:hover{color:var(--ink);border-left-color:var(--line2)}
.side-card .toc-link.on{color:var(--brand);font-weight:650;border-left:2px solid var(--brand);
  padding-left:10px}
.catnav{display:flex;flex-direction:column}
.catnav a{display:flex;justify-content:space-between;align-items:baseline;gap:10px;
  padding:6px 0;font-size:13.3px;color:var(--muted);border-bottom:1px solid var(--line)}
.catnav a:last-child{border-bottom:0}
.catnav a:hover{color:var(--ink)}
.catnav a .n{font-family:var(--mono);font-size:11px;color:var(--faint)}
.catnav a.on{color:var(--brand);font-weight:650}
.catnav a.on .n{color:var(--brand)}
.hotlist{display:flex;flex-direction:column}
.hotlist a{display:flex;align-items:center;gap:10px;padding:7px 0;border-bottom:1px solid var(--line)}
.hotlist a:last-child{border-bottom:0}
.hotlist img{width:26px;height:26px;flex:0 0 26px;border-radius:4px;border:1px solid var(--line);
  background:#fff;object-fit:contain;padding:3px}
.hotlist .hm{display:flex;flex-direction:column;min-width:0;flex:1}
.hotlist .hn{font-size:13.3px;font-weight:600;color:var(--ink);line-height:1.5;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.hotlist .hc{font-size:11.5px;color:var(--faint);line-height:1.5;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.hotlist a:hover .hn{color:var(--brand)}
.side-cta{border:1px solid var(--line2);border-radius:6px;padding:16px 16px 15px;background:var(--sheet)}
.side-cta p{margin:0 0 12px;font-size:12.8px;line-height:1.7;color:var(--muted)}
.side-cta a{display:block;text-align:center;background:var(--ink);color:var(--paper);
  font-size:13.3px;font-weight:600;padding:9px;border-radius:4px;transition:.16s}
.side-cta a:hover{background:#000}

/* ---------- 分类页 ---------- */
.hero-sm{padding:40px 0 34px;border-bottom:1px solid var(--line);background:var(--paper)}
.hero-sm h1{margin:0 0 8px;font-size:30px;letter-spacing:-.02em;font-weight:750}
.hero-sm .tagline{margin:0;font-size:14.5px;color:var(--muted)}

/* ---------- 页脚 ---------- */
.site-foot{margin-top:44px;border-top:1px solid var(--line);padding:26px 0 34px;
  color:var(--faint);font-size:12.8px}
.site-foot .wrap{display:flex;gap:16px;flex-wrap:wrap;align-items:center}
.site-foot a{color:var(--muted)}
.site-foot a:hover{color:var(--brand)}

/* ---------- 响应式 ---------- */
@media(max-width:680px){
  body{font-size:15px}
  .hero{padding:38px 0 32px}
  .hero h1{font-size:27px}
  .hero2{padding:24px 0 26px}
  .hero2 h1{font-size:26px}
  .hero2 .logo-xl{width:54px;height:54px;flex:0 0 54px;border-radius:6px;padding:7px}
  .hero2 .ttl{gap:13px;margin-bottom:13px}
  .hero2 .facts{gap:4px 14px;font-size:12.5px}
  main{padding:6px 18px 24px}
  .sec{padding:24px 0 26px}
  .sec h2{font-size:17.5px;gap:9px}
  .fgrid,.relgrid{grid-template-columns:1fr;gap:2px}
  .relgrid .card:nth-last-child(-n+2){border-bottom:1px solid var(--line)}
  .relgrid .card:last-child{border-bottom:0}
  .cmp2{grid-template-columns:1fr;gap:16px}
  .ptable,.stable{font-size:13.5px}
  .ptable th,.stable th,.ptable td,.stable td{padding-right:8px}
  .official{padding:22px 16px}
  .official .dom{font-size:19px}
  pre.code{font-size:12px;padding:13px}
  .site-head .wrap{height:52px;gap:12px}
  .head-nav a{padding:5px 8px;font-size:12.5px}
  .tgrid{grid-template-columns:1fr}
  .alltools{padding:16px}
  .section{padding:28px 0 4px}
  .section-head h2{font-size:18px}
}