:root{
  --c1:#af9d23; --c1d:#7c6f13; --c2:#7cc73d; --ink:#2d2c25; --mut:#7e7b6d; --bg:#ffffff; --surf:#fdfdfc; --line:#e9e9e7;
  --radius:12px; --maxw:1080px; --serif:"Iowan Old Style","Palatino Linotype","Songti SC",serif; --sans:-apple-system,BlinkMacSystemFont,"Helvetica Neue","Microsoft YaHei",sans-serif;
  --shadow:0 2px 10px rgba(15,23,42,.05);
}

*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);line-height:1.75;font-size:16px;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:var(--c1);text-decoration:none}a:hover{color:var(--c1d)}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}
h1,h2,h3,h4{line-height:1.3;margin:0 0 .5em;font-weight:800;letter-spacing:-.01em}
p{margin:0 0 1em}.mut{color:var(--mut)}
.btn{display:inline-block;background:linear-gradient(135deg,var(--c1),var(--c1d));color:#fff!important;padding:12px 26px;border-radius:var(--radius);font-weight:700;box-shadow:0 6px 18px var(--btnsh,rgba(21,20,60,.16));transition:transform .16s,box-shadow .16s;border:0;cursor:pointer}
.btn:hover{transform:translateY(-2px);box-shadow:0 10px 26px rgba(21,20,60,.2)}
.btn-sec{display:inline-block;border:1.5px solid var(--c1);color:var(--c1)!important;padding:11px 24px;border-radius:var(--radius);font-weight:700;background:transparent;transition:.16s}
.btn-sec:hover{background:color-mix(in srgb,var(--c1) 8%,transparent)}
.tag{display:inline-block;background:var(--surf);border:1px solid var(--line);color:var(--ink);padding:4px 13px;border-radius:999px;font-size:13px;margin:0 7px 9px 0;transition:.15s}
.tag:hover{border-color:var(--c1);color:var(--c1)}
.pill{display:inline-block;background:color-mix(in srgb,var(--c1) 12%,var(--surf));color:var(--c1d);font-size:12px;font-weight:700;padding:3px 11px;border-radius:999px}
/* 顶部导航 */
.topbar{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--surf) 92%,transparent);backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--line)}
.topbar-in{display:flex;align-items:center;gap:20px;height:64px}
.logo{display:flex;align-items:center;gap:10px;color:var(--ink);font-size:19px;font-weight:800;white-space:nowrap}
.logo:hover{color:var(--c1)}
.logo-mark{width:38px;height:38px;border-radius:11px;background:linear-gradient(135deg,var(--c1),var(--c1d));color:#fff;display:inline-flex;align-items:center;justify-content:center;box-shadow:0 4px 12px rgba(21,20,60,.18)}
.logo-mark svg{width:22px;height:22px}
.logo small{display:block;font-size:11px;color:var(--mut);font-weight:500;letter-spacing:.02em}
.main-nav{flex:1}
.main-nav ul{display:flex;gap:4px;list-style:none;margin:0;padding:0;flex-wrap:wrap;align-items:center}
.main-nav a{display:block;padding:8px 13px;color:var(--ink);font-weight:600;font-size:15px;border-radius:9px;transition:.15s}
.main-nav a:hover{background:var(--bg);color:var(--c1)}
.nav-search form{display:flex}
.nav-search input{border:1px solid var(--line);border-right:0;border-radius:999px 0 0 999px;padding:9px 15px;font-size:14px;background:var(--bg);color:var(--ink);width:150px;outline:none}
.nav-search button{border:0;background:var(--c1);color:#fff;border-radius:0 999px 999px 0;padding:0 16px;font-weight:700;cursor:pointer}
.nav-toggle{display:none;background:none;border:0;width:34px;height:34px;cursor:pointer;color:var(--ink);position:relative}
.nav-toggle:before{content:"";position:absolute;left:7px;right:7px;top:13px;height:2px;background:var(--ink);box-shadow:0 7px 0 var(--ink),0 -7px 0 var(--ink)}
/* 区块标题 */
.section{padding:50px 0}.band{background:var(--surf);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-label{font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--c2);font-weight:800;margin-bottom:8px}
.sec-title{font-size:28px;margin-bottom:6px;letter-spacing:-.02em}.sec-sub{color:var(--mut);margin-bottom:26px;max-width:680px}
/* 分类卡 */
.cats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.cat-card{display:block;background:var(--surf);border:1px solid var(--line);border-radius:var(--radius);padding:26px;transition:.2s;color:var(--ink);position:relative;overflow:hidden}
.cat-card:hover{transform:translateY(-4px);box-shadow:0 16px 36px rgba(15,23,42,.1);border-color:var(--c1)}
.cat-ic{width:54px;height:54px;border-radius:14px;background:color-mix(in srgb,var(--c1) 13%,transparent);display:flex;align-items:center;justify-content:center;color:var(--c1);margin-bottom:14px}
.cat-ic svg{width:26px;height:26px}
.cat-card h3{font-size:19px}.cat-card p{color:var(--mut);font-size:14px;margin:0}.cat-cta{color:var(--c1);font-weight:700;font-size:14px;margin-top:12px}
/* 工具/文章行与卡 */
.tools-list{display:grid;gap:12px}
.tool-row{display:flex;align-items:center;justify-content:space-between;gap:16px;background:var(--surf);border:1px solid var(--line);border-radius:var(--radius);padding:15px 20px;color:var(--ink);transition:.16s}
.tool-row:hover{border-color:var(--c1);box-shadow:var(--shadow)}
.tool-row h4{margin:0;font-size:16px}.tool-row span{color:var(--mut);font-size:13px}.tool-arrow{color:var(--c1);font-size:22px;font-weight:800;transition:transform .16s}
.tool-row:hover .tool-arrow{transform:translateX(3px)}
.post-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.pcard{display:block;background:var(--surf);border:1px solid var(--line);border-radius:var(--radius);padding:20px;color:var(--ink);transition:.18s}
.pcard:hover{border-color:var(--c1);box-shadow:var(--shadow)}
.pcard h3{font-size:17px;margin:8px 0 6px}.pcard .meta{font-size:12.5px;color:var(--mut)}
.entry-card{display:block;background:var(--surf);border:1px solid var(--line);border-radius:var(--radius);padding:22px 24px;margin-bottom:14px;color:var(--ink);transition:.16s}
.entry-card:hover{border-color:var(--c1);box-shadow:var(--shadow)}
.entry-card h2{font-size:20px;margin:8px 0}.entry-card p{color:var(--mut);margin:0;font-size:14.5px}
.entry-meta{list-style:none;display:flex;gap:14px;padding:0;margin:0;font-size:12.5px;color:var(--mut);flex-wrap:wrap}
.pager{display:flex;gap:7px;flex-wrap:wrap;margin:26px 0}.pager a{padding:6px 13px;border:1px solid var(--line);border-radius:8px;color:var(--ink);font-size:14px;transition:.14s}
.pager a:hover{border-color:var(--c1);color:var(--c1)}
/* 内页 */
.crumb{font-size:13px;color:var(--mut);padding:24px 0}.crumb a{color:var(--c1)}
.layout{display:grid;grid-template-columns:1fr 300px;gap:34px;padding:10px 0 50px}
.article-body{font-size:16.5px}.article-body h1{font-size:32px;margin:.2em 0 .35em;letter-spacing:-.02em}
.article-body h2{font-size:23px;margin:1.6em 0 .6em;padding-top:.2em;display:flex;align-items:center}
.article-body h3{font-size:18px;margin:1.2em 0 .4em}
.article-body table{border-collapse:collapse;width:100%;margin:1.1em 0;font-size:14.5px}
.article-body th,.article-body td{border:1px solid var(--line);padding:9px 12px;text-align:left}
.article-body th{background:color-mix(in srgb,var(--c1) 8%,var(--surf));font-weight:700}
.article-body tbody tr:hover{background:color-mix(in srgb,var(--c1) 4%,var(--surf))}
.article-body blockquote{margin:1em 0;padding:10px 18px;border-left:4px solid var(--c1);background:var(--surf);border-radius:0 var(--radius) var(--radius) 0;color:var(--mut)}
.toc{background:var(--surf);border:1px solid var(--line);border-radius:var(--radius);padding:16px 20px;margin:1.2em 0;font-size:14.5px}
.toc b{display:block;margin-bottom:6px}.toc ol{margin:0;padding-left:20px}.toc a{color:var(--ink)}
.toc a:hover{color:var(--c1)}
.takeaway{background:color-mix(in srgb,var(--c1) 9%,var(--surf));border:1px solid color-mix(in srgb,var(--c1) 30%,var(--line));border-radius:var(--radius);padding:16px 20px;margin:1.1em 0}
.takeaway b{color:var(--c1d)}.takeaway p{margin:0}
ol.steps{list-style:none;counter-reset:s;padding:0;margin:1em 0}ol.steps li{counter-increment:s;position:relative;padding:0 0 18px 48px}
ol.steps li:before{content:counter(s);position:absolute;left:0;top:0;width:32px;height:32px;border-radius:10px;background:linear-gradient(135deg,var(--c1),var(--c1d));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;box-shadow:0 4px 10px rgba(21,20,60,.15)}
ol.steps b{font-size:16.5px}.scene-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:1em 0}
.scard{background:var(--surf);border:1px solid var(--line);border-radius:var(--radius);padding:18px;transition:.16m}.scard:hover{border-color:var(--c1)}
.scard h3{font-size:16px}
.mistake{border-left:4px solid var(--c2);padding:4px 0 4px 16px;margin:1em 0;background:color-mix(in srgb,var(--c2) 5%,var(--surf));border-radius:0 var(--radius) var(--radius) 0}
ul.tips{padding-left:20px}ul.tips li{margin:.5em 0}
.faq details,.faq .faqitem{background:var(--surf);border:1px solid var(--line);border-radius:var(--radius);padding:13px 18px;margin:10px 0;transition:.15s}
.faq details:hover,.faq .faqitem:hover{border-color:var(--c1)}
.faq summary{font-weight:700;cursor:pointer;list-style:none}.faq summary:before{content:"+ ";color:var(--c1);font-weight:800}
.related{margin:2em 0 1em;padding:20px;background:var(--surf);border:1px solid var(--line);border-radius:var(--radius)}
.related ul{margin:0;padding-left:20px}.related li{margin:.35em 0}
.side-box{background:var(--surf);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;margin-bottom:18px;box-shadow:0 2px 10px rgba(15,23,42,.04)}
.side-tt{font-weight:800;margin-bottom:12px;padding-bottom:8px;border-bottom:2px solid var(--c1);display:flex;align-items:center}
.rank-list{list-style:none;margin:0;padding:0}.rank-list li{display:flex;gap:10px;align-items:baseline;padding:7px 0;border-bottom:1px dashed var(--line);font-size:14.5px}
.rank-list .rk{flex-shrink:0;width:22px;height:22px;border-radius:6px;background:var(--c1);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-size:12px;font-weight:800}
.rank-list a{color:var(--ink)}
.meta-line{font-size:13.5px;color:var(--mut);margin:.2em 0 1.4em}
.byline{display:flex;align-items:center;gap:12px;margin:6px 0 18px}
.byline .av{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--c1),var(--c1d));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800}
.byline small{color:var(--mut)}
/* v3c 分栏骨架 */
.layout.sk-single{grid-template-columns:1fr}
.layout.sk-sider{grid-template-columns:1fr 300px}
.layout.sk-sidel{grid-template-columns:300px 1fr}
.layout.sk-three{grid-template-columns:220px 1fr 240px;gap:26px}
.layout.sk-mag{grid-template-columns:1fr 300px}
.layout.sk-topband{grid-template-columns:1fr}
.sk-main{min-width:0}.sk-side{min-width:0}
/* v3c 作者大卡 / 迷你头像 / 已核验徽标 */
.editor-card{display:grid;grid-template-columns:116px 1fr;gap:26px;align-items:center}
.editor-card .av-big{width:116px;height:116px;border-radius:26px;overflow:hidden;background:linear-gradient(135deg,var(--c1),var(--c1d));display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow)}
.editor-card .av-big svg{width:100%;height:100%}
.verified{display:inline-flex;align-items:center;gap:5px;font-size:12.5px;color:#2f9e63;font-weight:700;vertical-align:middle;margin-left:8px}
.verified svg{width:15px;height:15px;flex-shrink:0}
.av-mini{width:42px;height:42px;border-radius:50%;overflow:hidden;flex-shrink:0;background:linear-gradient(135deg,var(--c1),var(--c1d))}
.av-mini svg{width:100%;height:100%}
/* v3c 栏目内链矩阵 */
.colmatrix{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.colmatrix-col{background:var(--surf);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px}
.colmatrix-col h3{font-size:16px;margin-bottom:8px}
.colmatrix-col a{display:block;padding:6px 0;border-bottom:1px dashed var(--line);font-size:14px;color:var(--ink)}
.colmatrix-col a:hover{color:var(--c1)}
/* 正文内交互工具 .vtool */
.vtool{border:1.5px solid var(--c1);border-radius:calc(var(--radius) + 4px);overflow:hidden;margin:1.6em 0;box-shadow:var(--shadow);background:var(--surf)}
.vtool-h{background:linear-gradient(135deg,var(--c1),var(--c1d));color:#fff;font-weight:800;padding:12px 18px;font-size:15.5px;display:flex;align-items:center}
.vtool-b{padding:18px}
.vtool label{display:block;font-weight:700;font-size:14px;margin:0 0 6px}
.vtool input[type=text],.vtool input[type=number],.vtool input[type=date],.vtool select,.vtool textarea{width:100%;border:1px solid var(--line);border-radius:9px;padding:10px 12px;font-size:14.5px;font-family:inherit;background:var(--bg);color:var(--ink);margin-bottom:10px}
.vtool button{background:var(--c1);color:#fff;border:0;border-radius:9px;padding:9px 18px;font-weight:700;cursor:pointer;font-size:14px;margin:2px 6px 2px 0;transition:.15s}
.vtool button:hover{background:var(--c1d)}.vtool button.vt-ghost{background:transparent;color:var(--c1);border:1.5px solid var(--c1)}
.vt-controls{display:flex;gap:9px;align-items:center;flex-wrap:wrap;margin-bottom:12px}
.vt-controls select{width:auto;margin:0}.vt-controls input[type=number]{width:130px;margin:0}
.vt-results{list-style:none;margin:10px 0 0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:9px}
.vt-results li{margin:0}.vt-results button{width:100%;background:var(--bg);color:var(--ink);border:1px solid var(--line);margin:0;padding:9px;font-weight:600}
.vt-results button:hover{border-color:var(--c1);color:var(--c1)}
.vt-label{font-weight:700;margin-bottom:8px}
.vt-pick{font-size:26px;font-weight:800;color:var(--c1);text-align:center;padding:22px;background:var(--bg);border-radius:var(--radius);margin-top:6px;min-height:78px}
.vt-conv{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.vt-conv input{max-width:150px}.vt-eq{font-size:22px;font-weight:800}.vt-note{color:var(--mut);font-size:13px;margin-top:8px}
.vt-fields{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-bottom:8px}.vt-fields label{font-size:13.5px;color:var(--mut)}
.vt-answer{font-size:22px;font-weight:800;margin-top:10px}.vt-answer p{font-size:14px;font-weight:500;color:var(--mut);margin:4px 0 0}
.vt-stats{display:flex;gap:8px;flex-wrap:wrap;margin-top:6px}.vt-stats span{background:var(--bg);border:1px solid var(--line);border-radius:999px;padding:5px 13px;font-size:13px}
.vt-keywords{width:100%;color:var(--mut);font-size:13px;margin-top:8px}
.vt-meter{height:10px;background:var(--bg);border-radius:999px;overflow:hidden;margin:10px 0}.vt-meter i{display:block;height:100%;width:50%;background:var(--mut)}
.vt-meter i.bad{background:#d64545}.vt-meter i.mid{background:#e0a32e}.vt-meter i.good{background:#2f9e63}
.vt-rules{list-style:none;margin:8px 0 0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:6px;font-size:13.5px;color:var(--mut)}
.vt-rules li{position:relative;padding-left:15px}.vt-rules li:before{content:"";position:absolute;left:0;top:.55em;width:6px;height:6px;border:1.5px solid var(--c2);border-radius:50%}
.vt-rules li.ok{color:#2f9e63}.vt-rules li.ok:before{background:#2f9e63;border-color:#2f9e63}
.vt-check{list-style:none;margin:0 0 10px;padding:0}.vt-check li{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:8px 0;border-bottom:1px dashed var(--line)}
.vt-check label{display:flex;gap:9px;align-items:center;font-weight:500;margin:0;cursor:pointer}.vt-x{background:none!important;color:var(--mut)!important;border:0!important;font-size:20px;margin:0!important;padding:0 4px!important}
.vt-progress{display:flex;align-items:center;gap:12px}.vt-progress i{display:block;height:8px;background:var(--c1);border-radius:999px;min-width:4px}
.vt-swatches{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin-top:10px}.vt-sw{height:74px;border-radius:10px;display:flex;align-items:flex-end;padding:7px;cursor:pointer}.vt-sw b{font-size:11px;color:#fff;text-shadow:0 1px 2px rgba(0,0,0,.5)}
.vt-pgroup{margin-bottom:9px}.vt-pgroup>span{font-weight:700;font-size:13.5px;display:block;margin-bottom:5px}
.vt-chips{display:flex;gap:7px;flex-wrap:wrap}.vt-chip{background:var(--bg);color:var(--ink);border:1px solid var(--line)!important;margin:0!important;font-weight:600;padding:6px 12px!important;font-size:13px!important}
.vt-chip.on{background:var(--c1)!important;color:#fff!important;border-color:var(--c1)!important}
.vt-tablewrap{overflow:auto;max-height:340px;border:1px solid var(--line);border-radius:var(--radius)}
.vtool table{border-collapse:collapse;width:100%;font-size:13.5px}.vtool th,.vtool td{padding:8px 11px;border-bottom:1px solid var(--line);text-align:left;white-space:nowrap}.vtool th{background:var(--bg);position:sticky;top:0}
.vt-range{display:grid;grid-template-columns:120px 1fr 34px;align-items:center;gap:12px;margin-bottom:9px}
.vt-qtitle{font-weight:700}.vt-opts{list-style:none;margin:6px 0;padding:0}.vt-opts button{background:var(--bg);color:var(--ink);border:1px solid var(--line);text-align:left;width:100%;font-weight:500}
.vt-opts button.right{background:#e6f6ec;border-color:#2f9e63;color:#1d7a49}.vt-opts button.wrong{background:#fdeaea;border-color:#d64545;color:#b02a2a}.vt-why{font-size:13.5px;color:var(--mut);margin:4px 0}
/* CTA & 页脚 */
.cta{background:linear-gradient(135deg,var(--c1),var(--c1d));color:#fff;text-align:center;padding:56px 20px;border-radius:calc(var(--radius) + 4px);margin:46px auto;max-width:calc(var(--maxw) - 44px);box-shadow:0 18px 44px rgba(21,20,60,.18);position:relative;overflow:hidden}
.cta:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 18% 20%,rgba(255,255,255,.18),transparent 45%)}
.cta h2{color:#fff;font-size:28px;position:relative}.cta p{opacity:.92;position:relative}.cta .btn{background:#fff;color:var(--c1d)!important;position:relative}
.footer{background:var(--surf);border-top:1px solid var(--line);padding:44px 0 26px;margin-top:20px;color:var(--mut);font-size:14px}
.footer-in{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:30px}.footer h4{color:var(--ink);font-size:15px;margin-bottom:10px}.footer a{display:block;color:var(--mut);padding:3px 0}
.footer a:hover{color:var(--c1)}.footer-bar{border-top:1px solid var(--line);margin-top:26px;padding-top:18px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:13px}
.gotop{position:fixed;right:24px;bottom:24px;width:46px;height:46px;border-radius:50%;border:0;background:linear-gradient(135deg,var(--c1),var(--c1d));color:#fff;cursor:pointer;opacity:0;pointer-events:none;transition:.25s;z-index:60;box-shadow:0 8px 20px rgba(21,20,60,.25);display:flex;align-items:center;justify-content:center}
.gotop.show{opacity:1;pointer-events:auto}.gotop:hover{transform:translateY(-3px)}
/* 博客窄栏 */
.narrow{max-width:760px;margin:0 auto;padding:0 22px}
.blog-hero{padding:54px 0 10px;border-bottom:1px solid var(--line);margin-bottom:8px}
.blog-hero h1{font-family:var(--serif);font-size:40px;letter-spacing:-.01em}
.feed{padding:26px 0}.feed-item{display:grid;grid-template-columns:120px 1fr;gap:22px;padding:24px 0;border-bottom:1px solid var(--line)}
.feed-date{font-family:var(--serif);color:var(--c1);font-weight:700}.feed-item h2{font-family:var(--serif);font-size:23px;margin:0 0 6px}
.feed-item p{color:var(--mut);margin:0}
.prose{max-width:720px;margin:0 auto;padding:18px 0 50px;font-size:17.5px}
.prose .article-body{font-family:var(--sans)}.prose h1{font-family:var(--serif);font-size:36px}
.prose h2{font-family:var(--serif)}
.tagcloud{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0}
.archive{list-style:none;margin:0;padding:0}.archive li{display:flex;justify-content:space-between;padding:7px 0;border-bottom:1px dashed var(--line)}
.tocside{position:sticky;top:84px}
@media(max-width:900px){
 .cats-grid,.scene-grid{grid-template-columns:1fr}.post-grid{grid-template-columns:1fr}.layout{grid-template-columns:1fr}
 .footer-in{grid-template-columns:1fr}.nav-search{display:none}.nav-toggle{display:block;margin-left:auto}
 .main-nav{display:none;flex-basis:100%}.main-nav.on{display:block}.topbar-in{flex-wrap:wrap;height:auto;padding:10px 0}
 .main-nav ul{flex-direction:column}.vt-results{grid-template-columns:1fr 1fr}.feed-item{grid-template-columns:1fr;gap:6px}
 .layout.sk-three,.layout.sk-sider,.layout.sk-sidel,.layout.sk-mag{grid-template-columns:1fr}
 .colmatrix{grid-template-columns:1fr}.editor-card{grid-template-columns:1fr}
}
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