/* Article collection: shared Youthce shell, cool blue-gray surfaces. */
.library-page{background:#08090a;color:#f0f1f3}
.library-page .wrap{width:min(1000px,calc(100% - 64px));margin-inline:auto}
.library-page [hidden]{display:none!important}
.library-content{padding-top:36px;padding-bottom:80px}
.library-breadcrumb{display:flex;gap:16px;color:#858b96;font-size:12px}
.library-breadcrumb a:hover{color:#fff}
.library-intro{padding:44px 0 42px}
.library-eyebrow{font-size:11px;letter-spacing:.16em;color:#929cac;margin:0 0 19px}
.library-intro h1{font-size:clamp(38px,4.1vw,54px);font-weight:500;line-height:1.2;letter-spacing:-.04em;margin:0}
.library-intro>p:last-child{color:#a6aab3;font-size:15px;line-height:1.9;margin:22px 0 0}
.library-tools{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:18px;border-block:1px solid #2b2d33;padding:20px 0}
.library-filters{display:flex;flex-wrap:wrap;gap:5px}
.library-filters button{border:0;border-radius:5px;background:transparent;color:#a6aab3;padding:10px 12px;font:inherit;font-size:13px;cursor:pointer}
.library-filters button:hover{background:#181c24;color:#fff}
.library-filters button[aria-pressed=true]{background:#ebedf1;color:#101218}
.library-search{display:flex;align-items:center;gap:10px;background:#101115;border:1px solid #30343e;border-radius:6px;padding:10px 12px;color:#8d96a6;flex:1;max-width:275px;min-width:205px}
.library-search input{width:100%;min-width:0;border:0;background:transparent;color:#edf0f5;font:inherit;font-size:13px;outline:none}
.library-search:focus-within{border-color:#899bbd}
.library-search input::placeholder{color:#7f8795}
.result-bar{display:flex;justify-content:space-between;align-items:center;min-height:66px;color:#858e9e;font-size:12px}
.result-bar button{border:0;border-bottom:1px solid #5c6576;background:none;color:#bac2d0;font:inherit;cursor:pointer;padding:3px 0}
.doc-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.doc-card{display:flex;flex-direction:column;min-width:0;min-height:238px;padding:23px;background:#101115;border:1px solid #2b2d33;border-radius:8px;transition:border-color .18s,background .18s}
.doc-card:hover{border-color:#64758f;background:#141820}
.doc-meta{display:flex;justify-content:space-between;gap:12px;align-items:center;color:#8c98ab;font-size:11px;min-height:20px}
.doc-badge{color:#b8c6e1;font-size:10px;border:1px solid #354258;border-radius:3px;padding:1px 5px}
.doc-card h2{font-size:18px;font-weight:500;line-height:1.65;margin:17px 0 11px;letter-spacing:-.02em;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.doc-summary{color:#969eac;font-size:13px;line-height:1.9;margin:0 0 25px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.doc-foot{margin-top:auto;display:flex;justify-content:space-between;gap:16px;align-items:center;padding-top:17px;border-top:1px solid #252a34;font-size:11px;color:#808c9e}
.doc-foot>span:first-child{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.doc-foot>span:last-child{flex-shrink:0;color:#bac4d4}
.library-page button:focus-visible,.library-page a:focus-visible{outline:2px solid #96b1dc;outline-offset:4px}
.state-box{text-align:center;padding:80px 20px;color:#939dab;min-height:260px;font-size:15px}
.state-box h2{font-size:23px;font-weight:500;color:#eceff4}
.path-box{margin-top:42px;border-block:1px solid #2b2d33;padding:22px 0;color:#a6aebc;font-size:13px}
.path-box summary{cursor:pointer;list-style:none;font-size:15px;color:#d3dae5;display:flex;justify-content:space-between}
.path-box summary::-webkit-details-marker{display:none}
.path-box[open] summary{margin-bottom:22px}
.path-form{display:flex;gap:12px;margin:18px 0}
.path-form input,.ai-input input{flex:1;min-width:0;padding:12px;border:1px solid #303846;border-radius:5px;background:#11151c;color:#edf0f5;font:inherit}
.path-form button,.ai-input button,.ai-quick button{border:1px solid #354154;border-radius:5px;padding:10px 16px;background:#1c2533;color:#e0e7f2;font:inherit;cursor:pointer}
.path-steps{display:grid;gap:12px;padding:0;list-style:none}
.path-step{display:flex;gap:16px;padding:16px;border:1px solid #2b303a;border-radius:6px}
.path-num{color:#8aa2c8}
.path-why{color:#919dad;font-size:13px;line-height:1.8}
.path-title{font-weight:500;color:#e2e8f1}
.reader{max-width:800px;margin:0 auto;padding:46px 0 75px}
.back-link{display:inline-block;color:#9aa7bb;font-size:13px}
.r-cat{font-size:12px;color:#92a6c6;margin:30px 0 18px}
.reader h1{font-size:clamp(28px,3.2vw,44px);font-weight:500;line-height:1.45;letter-spacing:-.03em;margin:0 0 24px}
.r-meta{display:flex;flex-wrap:wrap;gap:13px;color:#8994a5;font-size:12px;padding-bottom:30px;border-bottom:1px solid #2b3039}
.r-meta a{color:#bdc9db}
.article-body{font-size:16px;line-height:2;color:#c0c6d0;margin-top:32px;overflow-wrap:anywhere}
.article-body img,.article-body video{max-width:100%;height:auto;border-radius:6px}
.article-body h2,.article-body h3{color:#edf0f5;margin-top:2em}
.article-body a{color:#a5bde3;text-decoration:underline;text-underline-offset:4px}
.article-body pre{overflow:auto;padding:20px;background:#10151f}
.article-body blockquote{margin:24px 0;padding:2px 24px;border-left:2px solid #758cad;background:#111720}
.article-body table{display:block;overflow:auto;max-width:100%;border-collapse:collapse}
.article-body td,.article-body th{border:1px solid #343d4c;padding:10px}
.article-excerpt{padding:26px 30px;background:#101319;border:1px solid #29313e;border-radius:8px}
.excerpt-label{color:#8294ae;font-size:12px;margin:0 0 10px}
.article-excerpt .button{font-size:13px;margin-top:22px;color:#11151d;text-decoration:none;min-height:44px;padding:12px 20px}
.r-nav{display:flex;gap:24px;border-top:1px solid #2b303a;margin-top:50px;padding-top:25px}
.r-nav:has(>span:first-child):has(>span:last-child){display:none}
.r-nav>a{flex:1;color:#d4dce8}
.r-nav .lab{font-size:12px;color:#8796ad;margin-bottom:10px}.r-nav .ti{font-size:14px}.r-nav .next{text-align:right}
.rel-box{margin-top:40px;padding:24px;border:1px solid #2c3441;border-radius:6px}.rel-h{font-size:15px}.rel-chips{display:flex;flex-wrap:wrap;gap:14px;margin-top:16px}.rel-q{font-size:13px;color:#aebfda}
.ai-fab{position:fixed;right:32px;bottom:30px;z-index:30;background:#e7edf6;color:#141c29;border:0;border-radius:24px;padding:14px 20px;cursor:pointer}
.ai-panel{display:none;position:fixed;right:24px;bottom:24px;width:min(380px,calc(100vw - 48px));z-index:40;border:1px solid #3c485e;border-radius:12px;background:#101620;box-shadow:0 12px 50px #0008;font-size:13px}
.ai-panel.open{display:block}.ai-head,.ai-quick,.ai-input{display:flex;align-items:center;gap:12px;padding:16px}.ai-head{justify-content:space-between;border-bottom:1px solid #2b3444}.ai-head button{background:transparent;border:0;color:#dbe3f0;cursor:pointer}.ai-body{max-height:300px;min-height:120px;overflow:auto;padding:16px;overscroll-behavior:contain}.ai-hint{color:#8e9bb0;line-height:1.8}.ai-msg{padding:12px;margin:8px 0;border-radius:6px;background:#1c2637;white-space:pre-wrap;line-height:1.8}.ai-msg.u{background:#28364c}.ai-quick button{font-size:12px;padding:8px}
@media(max-width:1000px){.library-tools{align-items:stretch}.library-search{max-width:none}.library-filters{width:100%}.doc-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:600px){.library-page .container,.library-page .wrap{width:calc(100% - 40px)}.library-content{padding-top:24px}.library-intro{padding:32px 0}.doc-grid{grid-template-columns:1fr}.doc-card{min-height:220px}.library-filters{gap:3px}.library-filters button{font-size:12px;padding:9px}.reader{padding-top:32px}.article-excerpt{padding:20px}.path-form{flex-direction:column}}
@media(prefers-reduced-motion:reduce){.doc-card{transition:none}}

.path-step .st,.path-step .sr{display:block}.path-step .sr{color:#8e9bad;margin-top:8px;line-height:1.8}.path-step .sgo{margin-left:auto;white-space:nowrap}

/* The guide is an authored series, distinct from topical categories. */
.guide-card{border-color:#354258}
.library-filters button[data-category="B 端设计指南"]{color:#bacdec}
.library-filters button[data-category="B 端设计指南"][aria-pressed=true]{color:#111927;background:#bdcee7}
.doc-card h2{-webkit-line-clamp:3}

.library-intro{padding:32px 0 28px}.result-bar{gap:18px}.result-bar .library-search{margin-left:auto;max-width:275px}

.library-filters .filter-count{display:inline-flex;align-items:center;justify-content:center;min-width:23px;height:19px;margin-left:7px;padding:0 5px;border-radius:4px;background:#27364c;color:#c4d4ef;font-size:10px;font-variant-numeric:tabular-nums;line-height:1;vertical-align:middle}
.library-filters button[aria-pressed=true] .filter-count{background:#526989;color:#fff}