:root{font-family:"Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#203047;background:#f5f7fb;font-size:14px;--blue:#155abd;--muted:#596579;--border:#e6ebf2}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:wait;opacity:.55}a{color:var(--blue);text-decoration:none}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #9bc0ff;outline-offset:3px}.demo-bar{background:#eaf1ff;color:#5e7395;font-size:13px;padding:9px max(24px,calc((100vw - 1180px)/2));display:flex;justify-content:space-between}.topbar{background:#fff;border-bottom:1px solid var(--border);min-height:88px;display:flex;align-items:center;justify-content:space-between;padding:0 max(24px,calc((100vw - 1180px)/2));gap:20px}.brand{display:flex;gap:12px;align-items:center;color:#203047;white-space:nowrap}.brand-mark{height:42px;width:42px;border-radius:13px;display:grid;place-items:center;background:var(--blue);color:#fff;font-size:23px;box-shadow:0 4px 10px #246bf322}.brand strong{font-size:20px;letter-spacing:1px}.brand small{display:block;color:var(--muted);font-size:13px;margin-top:5px}.topbar nav{display:flex;gap:8px}.nav-button{border:0;background:none;min-height:44px;border-radius:10px;padding:10px 16px;color:#63738c}.nav-button.active{background:#edf3ff;color:var(--blue);font-weight:600}.nav-button span{font-size:13px;margin-left:5px}.layout{max-width:1180px;margin:32px auto;padding:0 12px;display:grid;grid-template-columns:230px minmax(0,1fr);gap:32px}.profile-panel{background:white;border:1px solid var(--border);border-radius:16px;padding:24px;height:fit-content;position:sticky;top:24px}.eyebrow{font-size:13px;letter-spacing:1px;color:#6d84a7}.profile-panel h2{font-size:18px;margin:12px 0 8px}.profile-panel p{color:var(--muted);font-size:13px;line-height:1.8}.profile-panel label{display:block;font-size:13px;margin:28px 0 8px}.profile-panel select{width:100%;border:1px solid #dce5f2;background:#f8faff;padding:12px;border-radius:9px;color:#285eb7;min-height:44px}.side-note{display:flex;gap:12px;margin-top:29px}.side-note>span{font-size:13px;background:#f1f5fc;border-radius:7px;width:26px;height:26px;display:grid;place-items:center;color:#6e90c1;flex-shrink:0}.side-note b{font-size:13px;font-weight:500}.side-note p{font-size:13px;margin:5px 0 0;line-height:1.7}.sample-note{font-size:13px;line-height:1.9;border-top:1px solid var(--border);margin-top:30px;padding-top:20px;color:#8a97a9}.library{min-width:0}.intro{display:flex;align-items:center;justify-content:space-between;padding:25px 30px;background:#ebf2ff;border:1px solid #dfe9fd;border-radius:16px;overflow:hidden}.intro h1{font-size:25px;letter-spacing:.2px;margin:10px 0}.intro p{font-size:13px;color:#7386a6;margin:0;line-height:1.8}.intro-book{border:1px solid #bdd1f7;background:#f9fbff;border-radius:5px 12px 12px 5px;border-left:5px solid #acc7fa;transform:rotate(8deg);font-size:23px;line-height:1.3;padding:15px 24px;color:#7a9bd6;box-shadow:7px 8px 0 #dce7fc;margin:0 20px}.intro-book small{font-size:13px;white-space:nowrap}.search-row{display:flex;gap:10px;margin-top:23px}.search{background:#fff;border:1px solid #dce4ef;border-radius:12px;display:flex;align-items:center;gap:10px;flex:1;padding:0 15px;min-width:0}.search span{font-size:25px;color:#8798af}.search input{border:0;outline:none;width:100%;background:none;min-height:49px;font-size:13px}.refresh-button{background:#fff;border:1px solid var(--border);border-radius:11px;padding:0 14px;color:#75839b;font-size:17px}.refresh-button span{font-size:13px;margin-left:5px}.subjects{display:flex;gap:5px;margin-top:20px}.subject{background:transparent;border:0;color:#65758c;min-height:44px;padding:0 22px}.subject.active{color:var(--blue);font-weight:bold;border-bottom:3px solid var(--blue)}.type-tabs{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0}.type-chip{padding:9px 14px;min-height:40px;border:1px solid var(--border);background:#fff;border-radius:8px;color:#66758a;font-size:13px}.type-chip.active{color:var(--blue);background:#eaf2ff;border-color:#b7d0ff;font-weight:600}.conditions{display:flex;gap:12px;flex-wrap:wrap;background:#f0f3f8;border-radius:10px}.conditions:empty{display:none}.conditions label{display:flex;gap:6px;align-items:center;padding:10px;font-size:13px;color:#68798f}.conditions select{min-height:36px;background:white;border:1px solid #dbe3ee;border-radius:6px;color:#30445e;max-width:200px}.results-heading{display:flex;justify-content:space-between;align-items:center;margin-top:24px;margin-bottom:15px}.results-heading h2{font-size:16px;margin:0}.results-heading span{font-size:13px;color:#8a98aa}.resource-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.resource-card{border:1px solid var(--border);border-radius:13px;background:white;display:flex;gap:15px;padding:20px;text-align:left;transition:box-shadow .2s,transform .2s;min-width:0;width:100%;color:inherit}.resource-card:hover{box-shadow:0 7px 18px #26477b0c;transform:translateY(-2px);border-color:#bcd2f8}.doc-icon{flex:0 0 49px;height:64px;border-radius:5px 12px 5px 5px;background:#edf3ff;color:#5a88d5;font-size:13px;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:7px;position:relative;margin-top:3px}.doc-icon:before{content:'';position:absolute;right:0;top:0;border-left:12px solid #d8e5fb;border-top:12px solid white}.doc-icon i{width:21px;height:2px;background:currentColor;opacity:.35}.doc-icon.paper{background:#fff3e8;color:#cb8e4b}.doc-icon.experiment{background:#eaf8f5;color:#50a08f}.doc-icon.tool{background:#f2effb;color:#9584bb}.doc-icon.admission{background:#edf3f7;color:#7496ac}.card-copy{min-width:0;flex:1}.card-kicker{color:#8693a5;font-size:13px;display:flex;justify-content:space-between;gap:4px}.card-kicker .saved{color:#d69b41}.resource-card h3{font-size:14px;line-height:1.7;margin:8px 0;overflow-wrap:anywhere;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.card-meta{font-size:13px;color:#95a0ae;line-height:1.8;overflow-wrap:anywhere}.card-bottom{display:flex;justify-content:space-between;align-items:center;margin-top:14px;gap:4px}.answer-badge{font-size:13px;border-radius:4px;background:#f3f6fa;color:#718299;padding:4px 6px}.card-arrow{color:#6591d6;font-size:13px;white-space:nowrap}.empty{background:#fff;border:1px dashed #d3deed;border-radius:12px;padding:40px 20px;text-align:center;color:#7c8da4;grid-column:1/-1;line-height:1.9}.empty strong{font-size:17px;color:#405570;display:block}.empty p{font-size:13px}.primary,.secondary{min-height:44px;padding:11px 18px;border-radius:8px;border:1px solid #dce5f3;background:white;color:#42608a}.primary{color:white;background:var(--blue);border-color:var(--blue)}.library-footer{text-align:center;font-size:13px;color:#9aa7ba;margin:30px 0}.error-banner{padding:15px;background:#fff5ec;color:#926528;border-radius:10px;line-height:1.7;margin-bottom:15px}dialog{border:0;border-radius:18px;padding:0;width:min(860px,calc(100vw - 40px));max-height:90vh;box-shadow:0 25px 70px #213a6240;color:#203047}dialog::backdrop{background:#162d4d65;backdrop-filter:blur(3px)}.detail-header{display:flex;justify-content:space-between;align-items:center;padding:18px 26px;border-bottom:1px solid var(--border);color:#7a8ca6;font-size:13px}.close{border:0;background:#f4f7fb;border-radius:50%;height:36px;width:36px;font-size:23px;color:#7e8a9a}.detail-body{padding:28px;display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:26px}.detail-tag{display:inline-block;background:#edf3ff;color:#3973cc;font-size:13px;padding:5px 8px;border-radius:5px;margin:0 6px 8px 0}.detail-main h1{font-size:23px;line-height:1.6;margin:9px 0 12px;overflow-wrap:anywhere}.description{color:#7688a1;line-height:1.9;font-size:13px}.metadata{display:flex;flex-wrap:wrap;gap:8px;margin-top:17px}.metadata span{font-size:13px;color:#687f9e;border:1px solid #e1e8f3;padding:5px 7px;border-radius:4px}.detail-main h2,.detail-aside h2{font-size:14px;margin:24px 0 12px}.document{white-space:pre-wrap;overflow-wrap:anywhere;font-size:13px;line-height:2;background:#fafbfd;border:1px solid #e6ebf2;border-radius:10px;padding:20px;color:#4d607b;max-height:370px;overflow:auto}.usage{font-size:13px;line-height:1.9;color:#76859b}.detail-aside{background:#f6f8fc;border:1px solid #e8edf5;border-radius:12px;padding:18px;height:fit-content}.detail-aside h2:first-child{margin-top:0}.file-link{border:1px solid #e0e8f3;background:#fff;border-radius:8px;padding:12px;width:100%;text-align:left;display:block;margin-bottom:9px;color:#355f95}.file-link b{display:block;font-size:13px}.file-link small{display:block;overflow-wrap:anywhere;line-height:1.8;font-size:13px;color:#8c9ab0;margin-top:5px}.source{color:#8290a4;font-size:13px;line-height:1.9;overflow-wrap:anywhere}.source a{display:inline-block;margin-top:8px}.detail-actions{display:flex;gap:10px;margin-top:20px}.detail-actions button{flex:1}.no-file{font-size:13px;color:#8895a8;line-height:1.8}.toast{position:fixed;bottom:40px;left:50%;transform:translateX(-50%);padding:13px 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@media(max-width:1000px){.layout{grid-template-columns:190px minmax(0,1fr);gap:20px;padding:0 20px}.profile-panel{padding:18px}.resource-grid{grid-template-columns:1fr}.intro-book{margin-right:5px}.intro{padding:22px}.intro h1{font-size:23px}}
@media(max-width:650px){.demo-bar{padding:8px 16px;font-size:13px}.topbar{min-height:76px;padding:13px 16px;gap:8px}.brand-mark{width:36px;height:36px;font-size:20px;border-radius:10px}.brand{gap:8px}.brand strong{font-size:17px}.brand small{font-size:13px}.topbar nav{gap:2px}.nav-button{font-size:13px;padding:8px;min-height:42px}.nav-button span{display:none}.layout{display:block;margin:16px auto;padding:0 16px}.profile-panel{position:static;padding:0;border:0;background:none;display:flex;align-items:center;justify-content:space-between;margin:0 0 14px}.profile-panel .eyebrow,.profile-panel h2,.profile-panel p,.side-note,.sample-note{display:none}.profile-panel label{margin:0;font-size:13px;color:#7f8ba0}.profile-panel select{width:120px;min-height:40px;padding:9px;background:#fff}.intro{padding:20px;border-radius:12px}.intro .eyebrow{font-size:13px}.intro h1{font-size:22px;line-height:1.5;max-width:200px;margin:8px 0}.intro p{font-size:13px;max-width:210px}.intro-book{font-size:18px;margin:0;padding:13px 15px}.intro-book small{font-size:13px}.search-row{margin-top:17px}.search input{font-size:13px;min-height:46px}.refresh-button{padding:0 13px}.refresh-button span{display:none}.subjects{margin-top:12px}.subject{padding:0 22px}.type-tabs{flex-wrap:nowrap;overflow:auto;scrollbar-width:none;margin:15px -16px;padding:0 16px;gap:7px}.type-chip{white-space:nowrap;font-size:13px;padding:9px 12px}.conditions{gap:0}.conditions label{padding:8px;font-size:13px;max-width:100%}.conditions select{max-width:160px}.resource-card{padding:17px;gap:15px}.resource-card h3{font-size:15px;margin:7px 0}.card-kicker{font-size:13px}.card-meta{font-size:13px}.card-bottom{margin-top:10px}.doc-icon{flex-basis:47px}.resource-grid{gap:11px}.results-heading{margin-top:20px}.library-footer{font-size:13px}dialog{width:100vw;max-height:94dvh;margin:auto 0 0;border-radius:18px 18px 0 0}.detail-header{padding:12px 18px}.detail-body{display:block;padding:20px}.detail-main h1{font-size:22px}.detail-aside{margin-top:22px}.document{max-height:280px}.detail-actions{position:sticky;bottom:0;background:#f6f8fc;padding-top:8px}.detail-actions button{min-height:46px}}
[hidden]{display:none!important}.mine-layout{max-width:760px;margin:32px auto;padding:0 20px}.mine-heading{display:flex;align-items:center;justify-content:space-between;gap:12px}.mine-heading h1{margin:8px 0 20px}.account-card{background:#fff;border:1px solid var(--border);border-radius:16px;padding:24px;margin:18px 0}.account-card h2{font-size:16px;margin:0 0 12px}.account-card h3{font-size:19px}.account-card p,.account-card small{color:var(--muted);line-height:1.8}.identity{display:flex;align-items:center;gap:20px;background:linear-gradient(120deg,#edf4ff,#fff)}.account-avatar{display:grid;place-items:center;width:66px;height:66px;background:#dceaff;color:#155abd;font-size:28px;border-radius:20px;flex-shrink:0}.identity h2{overflow-wrap:anywhere}.identity p{margin:6px 0}.account-actions,.preference-switch{display:flex;gap:10px;flex-wrap:wrap}.record-shortcuts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.record-shortcuts button{min-height:90px;background:white;border:1px solid var(--border);border-radius:12px;color:#516783}.record-shortcuts strong{display:block;color:var(--blue);font-size:23px;margin-bottom:10px}.service-links button{display:block;width:100%;border:0;border-bottom:1px solid var(--border);background:white;min-height:52px;text-align:left;color:#405570}.account-form{padding:24px;line-height:1.9}.account-form label:not(.inline){display:block;margin:14px 0}.account-form input:not([type=checkbox]),.account-form select{display:block;width:100%;min-height:44px;border:1px solid #dce5f2;padding:10px;border-radius:8px;background:#fff;color:#203047}.account-form fieldset{border:1px solid var(--border);border-radius:8px;margin-top:18px}.account-form .inline{display:inline-flex;gap:8px;align-items:center;min-height:44px;margin-right:12px}.account-form button{margin:8px 8px 0 0}.account-form #account-error{color:#a84e25}.record-row{display:flex;align-items:center;justify-content:space-between;gap:8px;border-bottom:1px solid var(--border);padding:12px 0}.record-row button:first-child,.continue{overflow-wrap:anywhere;text-align:left;min-width:0}.record-row button:last-child{flex-shrink:0}#account-dialog{max-width:560px}.subjects{flex-wrap:wrap}@media(max-width:650px){.mine-layout{margin:20px auto;padding:0 16px}.account-card{padding:20px}.account-form{padding:20px}.record-shortcuts{gap:7px}.record-shortcuts button{font-size:13px}.identity{gap:14px}.mine-heading h1{font-size:25px}.topbar nav .nav-button{min-width:48px}}
.scenario-tabs,.active-filters{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:12px 0}.scenario-tabs>span,.active-filters>span{font-size:13px;color:#596579}.scenario-tabs:empty,.active-filters:empty{display:none}.active-filters button{min-height:36px;border:1px solid #b7d0ff;border-radius:8px;background:#eaf2ff;color:#285eb7;padding:7px 10px;font-size:13px;max-width:100%;overflow-wrap:anywhere}.active-filters #reset-filters{background:transparent;border-color:transparent}.detail-actions{flex-wrap:wrap}.detail-actions button{flex:1 1 100%}.resource-reference{font-size:13px;overflow-wrap:anywhere;color:#596579}.copy-fallback{width:100%;min-height:80px;margin-top:12px}.preference-notes{border-top:1px solid #e6ebf2;margin-top:18px;padding-top:10px}.preference-notes summary{min-height:44px;cursor:pointer;color:#526b90;padding:10px 0}.type-chip,.conditions select{min-height:44px}@media(max-width:650px){.scenario-tabs{gap:6px}.scenario-tabs .type-chip{font-size:13px}.active-filters button{min-height:44px}.subject{padding:0 18px}.profile-panel select{width:180px}.close{min-height:44px;min-width:44px}}
@media(max-width:650px){#detail{max-width:100vw}}
/* UX audit: readable helper copy, reachable controls and compact mobile discovery. */
.card-kicker,.card-meta,.source,.view-note,.library-footer,.sample-note,.description,.usage,.file-link small,.no-file,.results-heading span,.profile-panel label,.intro p,.eyebrow,.loading,.detail-header,.account-card small,.scenario-tabs>span,.active-filters>span{color:#596579}
.card-arrow,.detail-tag{color:#155abd}.answer-badge{color:#526078}.card-kicker .saved{color:#805b12}
.doc-icon{color:#155abd}.doc-icon.paper{color:#805b12}.doc-icon.experiment{color:#276c60}.doc-icon.tool{color:#68508d}.doc-icon.admission{color:#44687f}
.resource-card h3{font-size:16px;line-height:1.5}.card-bottom{flex-wrap:wrap}.card-kicker{flex-wrap:wrap}
.subject,.nav-button,.close,.conditions select,.active-filters button,.profile-panel select{min-height:44px;min-width:44px}
.danger-action{min-height:44px;padding:11px 18px;border:1px solid #d9a5a5;border-radius:8px;background:#fff;color:#9f2424}
@media(max-width:650px){.intro{padding:14px 16px}.intro .eyebrow,.intro-book{display:none}.intro h1{font-size:18px;max-width:none;margin:0 0 6px}.intro p{max-width:none}.topbar{flex-wrap:wrap}.brand small{font-size:13px}.subject{padding:0 13px}.card-meta{font-size:13px}.search input{font-size:15px}}