:root{--blue:#2858ef;--ink:#111827;--muted:#7d8490;--line:#eceef1;--paper:#f7f9fc}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:white;color:var(--ink);font:16px/1.7 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}a{color:inherit;text-decoration:none}a:hover{color:var(--blue)}a:focus-visible{outline:2px solid var(--blue);outline-offset:4px}button,input,select,textarea{font:inherit}.site-width{width:min(1100px,calc(100% - 48px));margin-inline:auto}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.breadcrumb-band{background:linear-gradient(#f5f8fd,#fbfcff);padding:32px 0 20px}.breadcrumbs{display:flex;gap:10px;align-items:center;flex-wrap:wrap;font-size:12px;color:#8a909a}.breadcrumbs>span:last-child{max-width:70%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.guide-intro{border-bottom:1px solid #f5f5f6;padding:17px 0 33px;color:#606a7a;font-size:16px}.listing{width:min(864px,calc(100% - 48px));margin:auto;padding:26px 0 76px;min-height:560px}.category-tabs{display:flex;gap:32px;border-bottom:1px solid var(--line);overflow-x:auto;scrollbar-width:none}.category-tabs a{font-size:17px;color:#626b7a;font-weight:600;white-space:nowrap;padding:13px 2px 17px;border-bottom:3px solid transparent}.category-tabs a[aria-current]{color:#2358cd;border-bottom-color:#2358cd}.article-row{padding:30px 0;border-bottom:1px solid var(--line)}.article-row h2{font-size:20px;line-height:1.6;font-weight:700;margin:0 0 8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.article-meta{font-size:12px;color:#8b919c;line-height:1.8}.article-row p{font-size:14px;color:#626b79;line-height:1.9;margin:10px 0 0;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;overflow-wrap:anywhere}.tag-heading{border-bottom:1px solid var(--line);padding:10px 0 24px}.tag-heading h2{font-size:25px;margin:0 0 10px}.tag-heading p{font-size:14px;color:#626b79;margin:0 0 10px}.tag-heading>span{font-size:12px;color:var(--muted)}.pagination{display:flex;flex-wrap:wrap;gap:8px;margin-top:30px;font-size:13px;align-items:center}.pagination a,.pagination span{min-width:36px;min-height:36px;display:grid;place-items:center;padding:5px 12px;border-radius:8px;border:1px solid var(--line)}.pagination [aria-current]{background:var(--blue);color:#fff;border-color:var(--blue)}.pagination .ellipsis{border:0;padding-inline:2px;min-width:20px}.empty-state{text-align:center;padding:65px 20px;color:var(--muted)}.empty-state h2{font-size:20px;color:var(--ink)}.empty-state p{font-size:14px}.site-footer{background:#0e1726;color:#f5f6f8;padding:40px 0 26px}.footer-inner{display:flex;flex-wrap:wrap;justify-content:space-between;gap:28px}.footer-brand{font-size:18px;font-weight:700}.site-footer p{font-size:12px;color:#8d96a7;margin:6px 0 0}.footer-links{display:flex;gap:28px;font-size:12px;align-items:flex-start;padding-top:4px}.site-footer small{width:100%;border-top:1px solid #273141;color:#7d8799;padding-top:20px;font-size:11px}.site-footer a:hover{color:#a7bfff}
.detail-page{background:#f6f6f6}
.detail-container{width:min(1024px,calc(100% - 124px));margin:36px auto 64px max(24px,calc((100% - 1100px)/2));padding:28px 36px 52px;background:#fff}
.detail-container .breadcrumb-band,.listing .breadcrumb-band{padding:12px 16px;border-radius:7px;margin-bottom:36px;background:#f7f7f7}
.detail-container .breadcrumbs,.listing .breadcrumbs{width:100%;margin:0;gap:12px}
.detail-container .breadcrumbs>span:last-child{max-width:70%}
.detail-layout{display:block}
.article-main{min-width:0}
.article-heading>.eyebrow{display:none}
.article-heading h1{font-size:28px;line-height:1.5;margin:0 0 14px;color:#2929d9;overflow-wrap:anywhere}
.article-meta{display:flex;gap:12px;flex-wrap:wrap;font-size:12px;color:var(--muted)}
.article-summary{margin:18px 0 24px;color:#454b54}
.article-summary strong{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
.article-summary p{margin:0;font-size:16px;line-height:1.9;overflow-wrap:anywhere}.sources a{color:var(--blue);text-decoration:underline;text-underline-offset:3px}
.table-scroll{overflow-x:auto;margin:24px 0;max-width:100%}
table{border-collapse:collapse;width:100%;font-size:14px}th,td{border:1px solid var(--line);padding:12px 16px;text-align:left;min-width:100px}th{background:var(--paper);font-weight:600}
pre{overflow-x:auto;background:var(--paper);padding:16px}
.toc{margin:24px 0;border:1px solid #e5e8f2;border-radius:8px;background:#fafbff;font-size:13px}
.toc summary{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;cursor:pointer;font-weight:600;list-style:none}
.toc summary::-webkit-details-marker{display:none}.toc details[open]>summary>span{transform:rotate(180deg)}
.toc nav{display:flex;flex-direction:column;gap:12px;padding:0 16px 16px;font-size:13px;color:#647084;overflow-wrap:anywhere}
.toc nav p{margin:0}.toc-h3{padding-left:14px;font-size:12px}.toc a.active{color:var(--blue)}
.toc summary:focus-visible{outline:2px solid var(--blue);outline-offset:3px}
.sources,.faq-section{margin-top:38px;padding-top:24px;border-top:1px solid var(--line)}
.sources h2,.faq-section h2,.related h2{font-size:20px;color:#15171c}
.sources ul{padding-left:22px;font-size:14px;line-height:1.9;overflow-wrap:anywhere}.sources li{margin:8px 0}.sources li::marker{color:#303bde}.sources a{color:#737985;text-decoration-style:dashed}.sources h2{color:#2929d9}
.faq-section h3{font-size:16px}.faq-section p{color:#454b54}
.detail-tags{display:flex;gap:14px 24px;align-items:center;flex-wrap:wrap;margin:36px 0;font-size:12px}
.detail-tags a{display:inline-flex;align-items:center;gap:7px;padding:5px 16px;background:#6268f5;color:#fff;border-radius:20px;line-height:1.5;overflow-wrap:anywhere}
.detail-tags a:hover{background:#454be2}.detail-tags svg{width:13px;height:13px;fill:none;stroke:currentColor;stroke-width:1.5;flex-shrink:0}
.related{margin:36px 0}.related h2{font-size:18px;font-weight:500;margin:0 0 16px;color:#4a505b}
.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.related-card{display:flex;flex-direction:column;gap:12px;min-width:0;padding:16px;border:1px solid #a5abe0;border-radius:6px;color:#454b54;transition:border-color .15s,box-shadow .15s}
.related-card:hover{border-color:#575fe8;box-shadow:0 3px 12px #4349be12;color:inherit}
.related-card h3{font-size:13px;line-height:1.7;font-weight:600;margin:0;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.related-card p{font-size:12px;line-height:1.8;color:#747982;margin:0;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.related-card>span{margin-top:auto;font-size:10px;color:#7b818d}
.adjacent{display:grid;grid-template-columns:1fr 1fr;gap:48px;margin:32px 0 0;padding:24px 0 0;border-top:1px dashed #d4d7e5}
.adjacent>div{min-width:0}.adjacent>div+div{text-align:right}
.adjacent a{display:flex;flex-direction:column;align-items:flex-start;gap:12px;font-size:12px;line-height:1.8;color:#4b55c5;overflow-wrap:anywhere}
.adjacent>div+div a{align-items:flex-end}.adjacent a>span{max-width:260px}
.adjacent small{display:flex;align-items:center;gap:8px;color:#717680;font-size:11px;font-weight:400;line-height:1.5}
.adjacent svg{width:13px;height:13px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}
.breadcrumb-home{width:15px;height:15px;fill:currentColor;vertical-align:-2px;margin-right:8px}
.article-heading .article-meta svg{width:14px;height:14px;fill:none;stroke:currentColor;stroke-width:1.3;vertical-align:-2px;margin-right:5px}
.preview-banner{padding:10px 24px;background:#fff3d6;color:#805b12;text-align:center;font-size:13px}.preview-banner a{margin-left:20px;text-decoration:underline}
@media(max-width:700px){
 .site-width{width:calc(100% - 40px)}.breadcrumb-band{padding:18px 0 12px}.category-tabs::-webkit-scrollbar{display:none}
 .site-footer{padding:30px 0 24px}.footer-inner{display:block}.footer-links{gap:22px;flex-wrap:wrap;margin:26px 0}.site-footer small{display:block}
 .detail-page{background:#fafafa}
 .detail-container{width:100%;margin:0;padding:18px 18px 100px;background:transparent}
 .detail-container .breadcrumb-band{display:none}
 .article-heading h1{font-size:14px;line-height:1.5;margin:0 0 6px}
 .article-meta{font-size:11px;line-height:1.7;gap:5px 8px}
 .article-summary{margin:12px 0 18px}.article-summary p{font-size:12px;line-height:1.75}
 .toc{margin:16px 0;font-size:12px}.toc summary{padding:10px 12px}.toc nav{font-size:12px;padding:0 12px 12px;gap:10px}.toc-h3{font-size:11px}
 .sources,.faq-section{margin-top:24px;padding-top:18px}.sources h2,.faq-section h2,.related h2{font-size:15px}.sources ul,.faq-section h3,.faq-section p{font-size:12px}
 .detail-tags{gap:7px;font-size:11px}.detail-tags a{padding:3px 9px}.detail-tags>span{width:100%}
 .adjacent{grid-template-columns:1fr;gap:18px;margin:24px 0;padding:20px 0}.adjacent a,.related>a{font-size:12px}
 .detail-page .site-footer{display:none}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

.pagination .disabled{color:#b1b6bf;background:#fafbfc}

/* Article listing: Figma PC articles and 390 × 844 mobile articles. */
.breadcrumb-band{padding:10px 0;background:#f7f8fb}
.breadcrumb-band .breadcrumbs{margin-bottom:0;color:#5354da}
.listing-page{background:#f6f6f6}
.listing{width:min(1200px,calc(100% - 48px));background:#fff;padding:40px 48px 64px;margin:36px auto 64px}
.guide-banner{position:relative;overflow:hidden;border-radius:26px;background:#ededed;padding:28px 26px 40px;margin:0 0 12px}
.guide-banner::after{content:'';position:absolute;right:-24px;top:-36px;width:88px;height:100px;border:2px dashed #8989e9;border-radius:50%;transform:rotate(-30deg);pointer-events:none}
.guide-badge{display:inline-block;position:relative;z-index:1;border-radius:20px;padding:4px 12px;background:#3030ed;color:#fff;font-size:12px;line-height:1.8}
.guide-banner h1{font-size:36px;line-height:1.4;margin:26px 0 20px;color:#101010}
.guide-banner h1::after{content:'';display:block;width:48px;height:3px;margin-top:6px;background:#3434ed}
.guide-banner p{padding:0;border:0;font-size:14px;color:#30343b;margin:0;line-height:1.9}
.guide-count{font-size:12px;color:#737783;display:block;margin-top:8px}
.category-tabs{gap:24px;align-items:center;border:0;padding:8px 0;overflow-y:hidden}
.category-label{font-size:14px;white-space:nowrap;flex-shrink:0}
.category-tabs a{font-size:14px;padding:6px 12px;border:0;border-radius:8px;font-weight:500;color:#242838}
.category-tabs a[aria-current]{background:#5757ec;color:#fff}
.article-row{padding:20px 12px 0;border:0}
.article-row h2{font-size:22px;line-height:1.55;margin-bottom:4px;color:#2929d9}
.article-row .article-meta{font-size:12px;gap:8px;color:#71747b}
.article-row p{margin:5px 0 0;font-size:14px;line-height:1.95;color:#292c33}
.listing .pagination{justify-content:center}
.mobile-actions{display:none}
@media(max-width:1150px){.listing{padding:30px}}
@media(max-width:700px){
 .listing-page{background:linear-gradient(180deg,#b2d8ff 0,#eef5ff 130px,#f6f9ff 420px);min-height:100vh}
 .listing-page .breadcrumb-band,.listing-page .site-footer{display:none}
 .listing{width:100%;margin:0;background:transparent;padding:32px 28px 100px;min-height:100vh}
 .guide-banner{background:transparent;padding:0;margin:0;border-radius:0;overflow:visible}
 .guide-banner>*,.guide-banner::after{display:none}
 .listing-page .guide-banner h1{display:block}
 .listing-page .guide-banner h1{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
 .listing-page .tag-guide-banner{display:block;background:transparent;padding:0;margin-bottom:16px;border-radius:0}
 .listing-page .tag-guide-banner>p,.listing-page .tag-guide-banner>.guide-count{display:block}
 .listing-page .tag-guide-banner h1{position:static;clip:auto;width:auto;height:auto;font-size:20px;margin:0 0 8px}
 .listing-page .tag-guide-banner .guide-badge,.listing-page .guide-banner::after{display:none}
 .category-tabs{gap:8px;padding:0 0 18px;margin-right:-28px;min-height:54px}
 .category-label{font-size:13px}
 .category-tabs a{position:relative;overflow:visible;flex-shrink:0;padding:7px 9px;font-size:13px;border-radius:9px;line-height:1.6}
 .category-tabs a[aria-current]::after{content:'';position:absolute;top:100%;left:calc(50% - 10px);border:10px solid transparent;border-top-color:#5757ec;border-bottom:0}
 .article-row{padding:12px 0 0}
 .article-row h2{font-size:14px;line-height:1.5;margin:0 0 5px}
 .article-row .article-meta{font-size:11px;gap:5px;line-height:1.6}
 .article-row p{font-size:12px;line-height:1.75;margin:4px 0 0;-webkit-line-clamp:5}
 .mobile-actions{position:fixed;bottom:0;left:0;right:0;z-index:20;display:flex;justify-content:center;gap:60px;background:#fff;border-radius:18px 18px 0 0;box-shadow:0 -3px 18px #2333550a;padding:8px 20px calc(8px + env(safe-area-inset-bottom))}
 .mobile-actions button,.mobile-actions>a{display:flex;flex-direction:column;align-items:center;gap:1px;border:0;background:transparent;color:#383c44;font-size:11px;cursor:pointer;min-width:64px;min-height:44px}
 .mobile-actions button>span,.mobile-actions>a>span{font-size:23px;line-height:1.2}
 .mobile-actions button:focus-visible,.mobile-actions>a:focus-visible{outline:2px solid var(--blue);outline-offset:2px}
 /* 空的状态提示节点也会参与 flex gap；固定定位可避免未点击时把两个按钮推偏。 */
 .mobile-actions>.share-status{position:absolute}
 .share-status:not(:empty){position:absolute;bottom:100%;left:50%;transform:translateX(-50%);padding:8px 16px;background:#182338;color:#fff;border-radius:8px;font-size:12px;white-space:nowrap;margin-bottom:8px}
 .listing .pagination{font-size:12px;gap:4px}
 .listing .pagination a,.listing .pagination span{min-width:28px;min-height:30px;padding:4px 7px}
}.toc-trigger{display:none}
.article-main{display:grid;grid-template-columns:minmax(0,1fr) 200px;column-gap:32px}
.article-main>:not(.toc){grid-column:1;min-width:0}
.article-main>.toc{grid-column:2;grid-row:1 / span 10;align-self:start;position:sticky;top:24px;margin:0;max-height:calc(100vh - 48px);overflow-y:auto}
.article-heading h1{text-align:left}
.toc summary{list-style:none}.toc summary::-webkit-details-marker{display:none}
.toc-dialog{padding:0;border:0;border-radius:18px 18px 0 0;width:100%;max-width:700px;max-height:75vh;margin:auto auto 0;color:var(--ink);background:#fff;box-shadow:0 -8px 40px #18233820}
.toc-dialog::backdrop{background:#10182766}
.toc-dialog>header{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;border-bottom:1px solid var(--line)}
.toc-dialog h2{font-size:16px;margin:0}.toc-dialog button{border:0;background:transparent;font-size:25px;cursor:pointer;min-width:40px;min-height:40px;color:inherit}
.toc-dialog .toc{display:block;position:static;max-height:none;margin:0;border:0;background:white;overflow:visible}
.toc-dialog .toc summary{display:none}.toc-dialog .toc nav{padding:18px;gap:16px;font-size:14px}
.toc-open{overflow:hidden}
.sources>summary{display:flex;justify-content:space-between;align-items:center;cursor:pointer;list-style:none;gap:12px}
.sources>summary::-webkit-details-marker{display:none}.sources>summary h2{margin:0}.sources[open]>summary>span{transform:rotate(180deg)}
@media(max-width:950px) and (min-width:701px){.detail-container{width:calc(100% - 48px);margin:28px auto 48px;padding:24px}.article-main{grid-template-columns:minmax(0,1fr) 170px;column-gap:22px}}
@media(max-width:700px){
 .article-main{display:block}.article-heading h1{text-align:left}
 .article-main>.toc{position:static;max-height:none;margin:16px 0}
 .js-toc .article-main>.toc{display:none}
 .js-toc .toc-trigger{display:block;position:fixed;right:16px;top:76px;z-index:20;border:0;border-radius:20px;padding:9px 14px;background:#4545e8;color:white;font-size:12px;box-shadow:0 2px 12px #2929d933;cursor:pointer}
 .js-toc .article-heading h1{padding-right:58px}
 .listing .pagination .page-number,.listing .pagination .page-last{display:none}
 .sources>summary{min-height:40px}
 .sources>summary:focus-visible,.toc-trigger:focus-visible{outline:2px solid var(--blue);outline-offset:3px}
}

@media(max-width:700px){.detail-container{margin:0}.related-grid{grid-template-columns:1fr;gap:12px}.related-card{padding:14px}.related-card h3{font-size:14px}.related-card p{font-size:12px}.related h2{font-size:16px}.adjacent{gap:20px}.adjacent>div+div{text-align:left}.adjacent>div+div a{align-items:flex-start}.detail-tags{gap:10px;margin:26px 0}.detail-tags a{padding:5px 12px}.related-card>span{font-size:11px}}

/* No empty directory column; controls stay inside the white reading surface. */
.article-main.without-toc{grid-template-columns:minmax(0,1fr)}
.sources li.reference-text{list-style:none}
.detail-tags svg{display:none}
@media(max-width:700px){
 body:has(.mobile-actions){padding-bottom:calc(68px + env(safe-area-inset-bottom,0px))}
 html{scroll-padding-bottom:calc(84px + env(safe-area-inset-bottom,0px))}
 .detail-page,.detail-container{background:#fff}
 .detail-container{padding-bottom:32px}
 .mobile-actions{height:calc(68px + env(safe-area-inset-bottom,0px));padding:8px 20px calc(8px + env(safe-area-inset-bottom,0px));gap:48px;align-items:center}
 .mobile-actions button,.mobile-actions>a{padding:0;line-height:1.5;justify-content:center;gap:4px;flex:0 0 72px;height:52px}
 .mobile-actions svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}
}