/* FEXLINK Research Knowledge Hub - A2 candidate styles (brand tokens V3) */
:root{--blue:#002FA7;--yellow:#FFFF00;--red:#FF0000;--gray050:#F7F8FA;--gray100:#E5E5E5;--gray300:#B2B2B2;--gray500:#7F7F7F;--text:#111111;--maxw:1080px}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--text);line-height:1.7;background:#fff}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.site-header{border-bottom:1px solid var(--gray100);background:#fff;position:sticky;top:0;z-index:10}
.header-inner{display:flex;align-items:center;gap:20px;flex-wrap:wrap;padding-top:14px;padding-bottom:14px}
.brand{display:inline-flex;align-items:center;gap:8px;font-weight:700;font-size:18px;color:var(--blue)}
.brand img{height:44px;width:auto;object-fit:contain;border-radius:4px;display:block;flex:none}
.main-nav{display:flex;gap:16px;flex-wrap:wrap}
.main-nav a{color:var(--text);font-size:15px}
.main-nav a[aria-current=page]{color:var(--blue);font-weight:600}
.header-side{margin-left:auto;display:flex;gap:18px;align-items:center;flex-wrap:wrap}
.lang-switch{display:flex;gap:10px;font-size:14px}
.lang-switch a{color:var(--gray500)}
.lang-switch a[aria-current=true]{color:var(--blue);font-weight:600}
.return-links{display:flex;gap:12px;align-items:center;font-size:14px}
.return-group-label{color:var(--gray500)}
.return-link{color:var(--blue)}
.hero{padding:56px 0 32px;border-bottom:1px solid var(--gray100)}
.hero h1{font-size:32px;margin:0 0 16px;color:var(--blue)}
.lead{font-size:17px;color:#333;max-width:760px}
.stats{display:flex;gap:36px;flex-wrap:wrap;margin-top:28px}
.stat{display:flex;flex-direction:column}
.stat-num{font-size:30px;font-weight:700;color:var(--blue);line-height:1.2}
.stat-label{font-size:14px;color:var(--gray500)}
.block{padding:36px 0;border-bottom:1px solid var(--gray100)}
.block:last-child{border-bottom:0}
.block h2{font-size:22px;margin:0 0 20px}
.block-head{display:flex;justify-content:space-between;align-items:baseline;flex-wrap:wrap;gap:12px}
.more-link{font-size:15px}
.topic-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:14px}
.topic-card{display:flex;justify-content:space-between;align-items:center;padding:14px 16px;background:var(--gray050);border:1px solid var(--gray100);border-radius:10px;color:var(--text)}
.topic-card:hover{border-color:var(--blue);text-decoration:none}
.topic-name{font-weight:600}
.topic-count{color:var(--blue);font-weight:700}
.card-list{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}
.card{padding:18px;border:1px solid var(--gray100);border-radius:12px;display:flex;flex-direction:column;gap:8px}
.card-title{font-size:17px;font-weight:600}
.card-meta{display:flex;gap:8px;flex-wrap:wrap}
.tag{font-size:12px;background:#eaf0ff;color:var(--blue);border-radius:999px;padding:2px 10px}
.tag-alt{background:var(--gray050);color:var(--gray500)}
.card-topic{font-size:14px;color:var(--gray500)}
.count{font-size:14px;color:var(--gray500);font-weight:400}
.mini-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px}
.mini-col h3{font-size:16px;margin:0 0 10px}
.mini-list{list-style:none;padding:0;margin:0;font-size:14px}
.mini-list li{margin:6px 0}
.topic-block{padding:26px 0}
.topic-block h2{border-left:4px solid var(--blue);padding-left:12px}
.article{max-width:820px;margin:0 auto}
.article h1{font-size:30px;line-height:1.35;margin:18px 0 20px}
.meta-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px 24px;margin:0 0 16px;padding:16px;background:var(--gray050);border-radius:10px}
.meta-item{margin:0}
.meta-item dt{font-size:12px;color:var(--gray500)}
.meta-item dd{margin:2px 0 0;font-size:14px}
.tag-row{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:22px}
.article-body h2{font-size:21px;margin:30px 0 12px;padding-left:10px;border-left:3px solid var(--blue)}
.article-body h3{font-size:17px;margin:22px 0 10px}
.article-body p{margin:12px 0}
.article-body ul,.article-body ol{padding-left:22px}
.article-body code{background:var(--gray050);padding:2px 5px;border-radius:4px;font-size:90%}
.article-body pre{background:var(--gray050);padding:14px;border-radius:8px;overflow:auto}
.article-body table{border-collapse:collapse;width:100%;font-size:14px}
.article-body th,.article-body td{border:1px solid var(--gray100);padding:8px;text-align:left}
.boundary,.disclaimer{margin-top:20px;padding:14px 16px;border-radius:8px;font-size:14px}
.boundary{background:#fff8e1;border:1px solid #ffe082}
.disclaimer{background:var(--gray050);border:1px solid var(--gray100);color:var(--gray500)}
.back-link{margin-top:26px}
.related ul{list-style:none;padding:0}
.related li{margin:8px 0}
.breadcrumb{font-size:14px;color:var(--gray500);padding:20px 0 0}
.page-head{padding:40px 0 24px;border-bottom:1px solid var(--gray100)}
.page-head h1{font-size:30px;margin:0 0 14px;color:var(--blue)}
.prose{max-width:820px}
.lang-links .lang-switch{font-size:15px}
.return-links-block{margin-top:12px}
.site-footer{border-top:1px solid var(--gray100);background:var(--gray050);margin-top:20px}
.footer-inner{padding:26px 20px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.footer-note{font-size:13px;color:var(--gray500);margin:0;max-width:640px}
@media (max-width:720px){
.header-side{margin-left:0;width:100%}
.hero{padding:36px 0 24px}
.hero h1{font-size:25px}
.stats{gap:22px}
.stat-num{font-size:25px}
.card-list{grid-template-columns:1fr}
.article h1{font-size:24px}
.page-head h1,.block h2,.hero h1{word-break:break-word}
}