:root{--paper:#fbfaf7;--white:#fff;--ink:#292725;--muted:#8a8580;--line:#e9e5df;--accent:#902b3e;--accent-soft:#f5e9ec;--green:#43775a;--font:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font);font-size:14px}button,input,textarea,select{font:inherit}button,a,input,textarea,select{outline-offset:3px}button{cursor:pointer}button{border:0;background:none;color:inherit}a{color:var(--accent);text-decoration:none}button:hover{filter:brightness(.94)}button:disabled{opacity:.45;cursor:default}button:focus-visible,a:focus-visible{outline:2px solid var(--accent)}.topbar{height:72px;background:var(--white);border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 28px;gap:45px}.brand{display:flex;align-items:center;gap:12px;color:var(--ink);font-size:20px;font-weight:650;white-space:nowrap}.brand-icon{display:grid;place-items:center;width:35px;height:35px;border-radius:9px;background:var(--accent);color:#fff6eb;font-family:serif;font-size:22px}.brand-divider{padding:0 10px;color:#cec6bd;font-size:18px;font-weight:300}.brand small{font-size:13px;font-weight:450;color:var(--muted)}nav{height:100%;display:flex;gap:24px}.nav-button{height:100%;position:relative;padding:0 4px;color:var(--muted);font-weight:600}.nav-button.active{color:var(--accent)}.nav-button.active:after{position:absolute;bottom:0;left:0;right:0;height:3px;background:var(--accent);content:''}.top-actions{margin-left:auto;display:flex;gap:18px;align-items:center;font-size:12px}.local-status{color:var(--muted);display:flex;align-items:center;gap:7px}.local-status i{width:6px;height:6px;border-radius:50%;background:#77907c}.quiet-button{color:#68635e;font-size:12px;padding:9px 2px}.workspace{display:grid;grid-template-columns:264px minmax(430px,1fr) 370px;height:calc(100dvh - 72px);max-width:1900px;margin:auto}.sidebar{display:flex;flex-direction:column;border-right:1px solid var(--line);background:#f7f5f1;min-height:0}.sidebar-heading{display:flex;align-items:center;justify-content:space-between;padding:26px 22px 19px}.sidebar-heading strong{font-size:14px}.sidebar-heading span{font-size:11px;color:var(--muted)}.search-box{display:flex;align-items:center;border:1px solid var(--line);border-radius:7px;background:#fff;gap:8px;padding:0 11px;height:38px}.sidebar>.search-box{margin:0 18px}.search-box span{font-size:22px;color:#a29a91;line-height:1}.search-box input{width:100%;min-width:0;border:0;background:transparent;font-size:12px;height:100%;outline:none;color:var(--ink)}.scope-tabs{display:flex;gap:4px;margin:14px 18px 12px;background:#ece9e4;border-radius:6px;padding:3px}.scope-tabs button{flex:1;font-size:11px;border-radius:4px;padding:6px 0;color:#77716b}.scope-tabs button.selected{background:white;color:var(--accent);box-shadow:0 1px 3px #00000009}.tree{overflow:auto;flex:1;padding:0 10px 20px;scrollbar-width:thin}.tree details{margin:3px 0}.tree summary{list-style:none;font-weight:550;font-size:12px;color:#5f5953;padding:13px 10px;display:flex;align-items:center;gap:7px;cursor:pointer}.tree summary::-webkit-details-marker{display:none}.tree summary:before{content:'›';color:#b8afa5;transform:rotate(0);font-size:15px}.tree details[open]>summary:before{transform:rotate(90deg)}.tree summary small{margin-left:auto;color:#a89f96;font-size:10px;font-weight:400}.topic-link{width:100%;display:flex;gap:8px;align-items:center;text-align:left;padding:10px 12px 10px 23px;font-size:12px;line-height:1.6;color:#736d66;border-radius:6px}.topic-link:hover{background:#ece8e1}.topic-link.active{background:var(--accent-soft);color:var(--accent);font-weight:600}.topic-link .dot{width:4px;height:4px;border-radius:50%;background:#c4bbb0;flex-shrink:0}.topic-link.active .dot{background:var(--accent)}.topic-link .topic-title{flex:1}.topic-link .star{font-size:11px;color:var(--accent)}.sidebar-footer{padding:14px 20px;display:flex;justify-content:space-between;border-top:1px solid var(--line);font-size:10px;color:var(--muted)}.sidebar-footer button{font-size:10px;padding:0}.content-panel{overflow:auto;padding:30px 38px 60px;scrollbar-width:thin;min-width:0}.breadcrumb{font-size:11px;color:var(--muted);display:flex;gap:8px;align-items:center;margin-bottom:22px}.breadcrumb b{font-weight:400;color:#bfb7af}.topic-header{display:flex;justify-content:space-between;gap:12px;align-items:flex-start}.topic-header h1{font-size:25px;line-height:1.5;letter-spacing:.5px;margin:0;font-weight:620}.favorite-button{font-size:22px;padding:4px 8px;color:#bdb4aa}.favorite-button.saved{color:var(--accent)}.topic-meta{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:13px 0 25px;color:var(--muted);font-size:11px}.badge{font-size:10px;padding:4px 7px;border:1px solid var(--line);border-radius:4px;color:#82766b;background:#fff}.badge.closed{color:var(--accent);border-color:#e8cfd5;background:#fbf3f5}.badge.open{color:#647e6b;background:#f0f5ef;border-color:#d9e4d7}.topic-tabs{display:flex;gap:24px;border-bottom:1px solid var(--line);margin-bottom:23px}.topic-tabs button{padding:0 0 12px;color:var(--muted);font-size:13px;border-bottom:2px solid transparent}.topic-tabs button.selected{color:var(--accent);border-color:var(--accent);font-weight:600}.reading{font-size:15px;line-height:2.05;color:#474039;word-break:break-word}.reading p{margin:0 0 18px}.source-caption{display:flex;gap:10px;align-items:center;font-size:11px;color:var(--muted);margin-top:20px;padding-top:18px;border-top:1px solid var(--line)}.source-caption button{color:var(--accent);font-size:11px;padding:0}.note-area{margin-top:32px}.section-label{display:flex;align-items:center;justify-content:space-between;margin:0 0 12px}.section-label h2{font-size:13px;margin:0;font-weight:600}.section-label span{font-size:10px;color:var(--muted)}textarea{resize:vertical;width:100%;min-height:105px;border:1px solid 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9px;font-weight:550}.ref-meta{font-size:10px;color:#a39a90;margin-bottom:20px;line-height:1.8}.ref-page{margin:0 0 24px}.ref-page-label{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);font-size:10px;color:#a69b91;padding-bottom:7px;margin-bottom:12px}.ref-page-label a{font-size:10px}.ref-text{font-family:var(--font);font-size:12px;line-height:2;color:#74685d;white-space:pre-wrap;word-break:break-word}.ref-text mark,.search-hit mark{background:#f8e9bc;color:inherit}.ref-results-title{font-size:11px;color:#91867b;margin:0 0 17px}.search-hit{display:block;width:100%;padding:15px 0;text-align:left;border-bottom:1px solid var(--line)}.search-hit strong{display:block;font-size:12px;line-height:1.7;color:#67554a;margin-bottom:6px}.search-hit p{font-size:11px;line-height:1.9;margin:0;color:#928375}.search-hit small{font-size:10px;color:var(--muted)}.ref-toolbar{display:flex;gap:10px;margin-bottom:20px}.small-button{font-size:11px;border:1px solid var(--line);border-radius:5px;padding:7px 10px;background:white}.question-card{border:1px solid var(--line);border-radius:9px;background:white;padding:21px 23px;margin:0 0 16px}.question-card-header{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:12px}.question-card-header strong{font-size:12px;font-weight:550}.question-card-header span{font-size:10px;color:var(--muted)}.question-prompt{font-size:14px;line-height:2.2;color:#4a4038;margin:0 0 13px;word-break:break-word}.blank-marker{display:inline-block;min-width:36px;text-align:center;padding:0 4px;margin:0 3px;border-bottom:1px solid #b37886;color:var(--accent);font-size:11px}.blank-inputs{display:flex;flex-wrap:wrap;gap:9px;margin:17px 0}.blank-field{display:flex;align-items:center;gap:5px;flex:1;min-width:140px}.blank-field label{font-size:10px;color:#9d8f80}.answer{width:100%;padding:9px 10px;border:1px solid var(--line);border-radius:5px;font-size:12px;background:#fdfcf9}.answer.correct{border-color:#97b79b;background:#f2f8f0}.answer.wrong{border-color:#c9949f;background:#fdf3f4}.question-actions{display:flex;gap:10px;align-items:center;margin-top:12px}.primary-button{background:var(--accent);color:#fff;border-radius:6px;padding:10px 16px;font-size:12px;font-weight:500}.secondary-button{background:white;border:1px solid var(--line);border-radius:6px;padding:9px 15px;font-size:12px;color:#74695f}.answer-feedback{padding:15px;margin-top:16px;background:#f8f6f2;border-radius:6px;font-size:12px;color:#776b60;line-height:1.9}.answer-feedback strong{font-weight:550;color:#5b4a41}.answer-feedback p{margin:5px 0}.answer-feedback ol{margin:8px 0;padding-left:22px}.feedback-source{font-size:10px;margin-top:12px;color:#a1968b}.filter-row{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin:0 0 20px}.filter-row button{font-size:11px;border:1px solid var(--line);border-radius:5px;padding:7px 10px}.filter-row button.selected{color:var(--accent);background:var(--accent-soft);border-color:#ead2d8}.filter-row span{margin-left:auto;font-size:10px;color:var(--muted)}.empty-state{font-size:13px;color:var(--muted);line-height:2;padding:24px 0}.loading-state{padding:50px 20px;color:var(--muted);text-align:center}.exam-title{margin:0;font-size:25px;font-weight:600}.exam-subtitle{font-size:12px;color:var(--muted);line-height:1.9;margin:13px 0 27px}.exam-choices{display:grid;gap:14px}.exam-choice{padding:24px;border:1px solid var(--line);border-radius:9px;background:white;display:flex;gap:20px;align-items:center}.exam-choice-icon{width:43px;height:43px;background:var(--accent-soft);display:grid;place-items:center;border-radius:10px;color:var(--accent);font-size:18px}.exam-choice div:nth-child(2){flex:1}.exam-choice h3{font-size:15px;margin:0 0 8px;font-weight:550}.exam-choice p{margin:0;font-size:11px;color:var(--muted);line-height:1.8}.exam-note{font-size:11px;color:#9a8e83;line-height:2;margin:25px 0}.exam-toolbar{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:20px;padding:16px 18px;border:1px solid var(--line);background:white;border-radius:7px}.exam-timer{color:var(--accent);font-size:22px;letter-spacing:1px;font-variant-numeric:tabular-nums}.exam-timer small{font-size:10px;letter-spacing:0;margin-right:8px;color:var(--muted)}.exam-toolbar span{font-size:11px;color:var(--muted)}.exam-steps{display:flex;gap:8px;margin-bottom:20px;align-items:center;font-size:11px}.exam-steps button{padding:7px 10px;border-radius:4px;background:#efede8;color:#888078}.exam-steps button.selected{background:var(--accent-soft);color:var(--accent)}.exam-steps span{margin-left:auto;color:var(--muted)}.answer-sheet{display:flex;gap:5px;flex-wrap:wrap;margin-bottom:20px}.answer-sheet button{width:28px;height:28px;border:1px solid var(--line);border-radius:4px;background:white;font-size:10px;color:#9b9187}.answer-sheet button.answered{background:#eaf2e8;color:var(--green);border-color:#d5e5d0}.answer-sheet button.active{border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}.exam-pagination{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-top:20px}.locked-reference{display:flex;height:70%;justify-content:center;flex-direction:column;align-items:center;text-align:center;color:#9a8d81;font-size:12px;line-height:2}.locked-reference span{font-size:32px;margin-bottom:14px;color:#cabaaa}.score-row{display:flex;gap:14px;margin:25px 0}.score-card{flex:1;border:1px solid var(--line);border-radius:8px;background:white;padding:20px}.score-card p{font-size:11px;color:var(--muted);margin:0 0 12px}.score-card strong{font-size:25px;color:var(--accent);font-weight:550}.score-card small{font-size:11px;color:var(--muted)}.self-grade{display:flex;align-items:center;gap:10px;font-size:11px;margin-top:12px}.self-grade input{width:64px;padding:7px;border:1px solid var(--line);border-radius:4px}.history-row{padding:15px 0;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;font-size:12px}.history-row small{color:var(--muted);font-size:10px}.history-row button{font-size:11px;color:var(--accent)}dialog{border:1px solid var(--line);border-radius:12px;max-width:640px;width:calc(100% - 40px);padding:35px;color:var(--ink);box-shadow:0 20px 80px #33261e22}dialog::backdrop{background:#29211b44;backdrop-filter:blur(3px)}.modal-close{position:absolute;right:15px;top:12px;font-size:24px;color:#b7a99c}.modal-title{font-size:20px;margin:0 0 17px;font-weight:600}.modal-description{font-size:12px;color:#87786a;line-height:2}.modal-actions{display:flex;gap:10px;margin-top:20px}.toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:#3c322c;color:white;font-size:12px;padding:13px 21px;border-radius:7px;opacity:0;pointer-events:none;transition:opacity .2s;z-index:20}.toast.show{opacity:1}.ref-more{width:100%;margin:10px 0;padding:10px;color:var(--accent);font-size:12px}.source-select-label{font-size:10px;color:var(--muted)}.offline-footer{padding:14px 0;font-size:10px;color:#aba095;line-height:1.9}.exam-mode-badge{font-size:11px;color:var(--accent)}.reference-body iframe{border:0;width:100%;height:calc(100dvh - 250px)}.record-summary{font-size:12px;color:var(--muted);line-height:2}.record-item{padding:14px 0;border-bottom:1px solid var(--line);font-size:12px;line-height:1.8}.record-item button{font-size:11px;color:var(--accent);padding:0}.warning-banner{background:#fff3d8;color:#8a6830;font-size:11px;line-height:1.8;padding:12px;border-radius:6px;margin-bottom:18px}.question-origin{font-size:10px;color:#a09386;margin-bottom:13px}.source-ref-name{white-space:normal;font-size:11px}.point-list{margin:8px 0;padding-left:22px;font-size:13px;line-height:2}.type-heading{font-size:12px;color:#9b8a7b;margin:24px 0 14px}.split-hint{font-size:10px;color:var(--muted);margin:15px 0}.inline-link{color:var(--accent);font-size:11px}.topic-empty{padding:22px 12px;font-size:12px;color:var(--muted);line-height:1.9}
@media(min-width:1600px){.workspace{grid-template-columns:285px minmax(500px,1fr) 440px}.content-panel{padding-left:55px;padding-right:55px}.reference-body{padding:28px}}
@media(max-width:1180px){.workspace{grid-template-columns:235px minmax(390px,1fr) 310px}.content-panel{padding:26px 25px}.topbar{padding:0 20px;gap:28px}.top-actions{gap:12px}.local-status{display:none}.reference-body{padding:18px}.topic-header h1{font-size:23px}}
@media(max-width:980px){.workspace{grid-template-columns:210px minmax(0,1fr)}.reference-panel{grid-column:2;height:450px;border-top:1px solid var(--line);border-left:0}.content-panel{min-height:calc(100dvh - 72px);overflow:visible}.sidebar{grid-row:1/3;max-height:calc(100dvh - 72px);position:sticky;top:0}.workspace{height:auto}.topbar{gap:22px}.top-actions{gap:8px}.brand small{display:none}.reference-body iframe{height:300px}}
@media(max-width:640px){.topbar{height:60px;padding:0 14px;gap:18px}.brand{font-size:17px;gap:8px}.brand-icon{width:29px;height:29px;font-size:19px}.brand-divider{display:none}nav{gap:14px}.nav-button{font-size:12px}.top-actions{gap:8px}.quiet-button{font-size:10px}.workspace{display:flex;flex-direction:column}.sidebar{position:static;max-height:none;border-bottom:1px solid var(--line)}.sidebar-heading,.sidebar-footer{display:none}.sidebar>.search-box{margin:14px 14px 0}.scope-tabs{margin:10px 14px}.tree{max-height:200px;padding-bottom:10px}.tree summary{padding:9px 10px}.topic-link{padding-top:7px;padding-bottom:7px}.content-panel{padding:22px 20px 35px;min-height:500px}.reference-panel{height:430px;flex-shrink:0}.topic-header h1{font-size:22px}.question-card{padding:18px}.exam-choice{padding:18px;gap:12px}.exam-choice-icon{display:none}.reading{font-size:14px}.score-row{gap:8px}.score-card{padding:15px}.top-actions #recordsBtn{display:none}}