*{box-sizing:border-box}html,body{height:100%;margin:0}body{font-family:Arial,"Noto Sans",sans-serif;background:#f4f6f9;color:#1d2939;font-size:14px;overflow:hidden}.topbar{height:54px;background:#fff;border-bottom:2px solid #28557f;display:flex;align-items:center;gap:12px;padding:6px 16px}.title{flex:1;text-align:center;font-size:17px;font-weight:700;color:#28557f;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chip{background:#eef4fa;border:1px solid #c6d5e4;border-radius:5px;padding:6px 9px;font-size:12px;white-space:nowrap}.chip a{color:#175f94}.workspace{height:calc(100vh - 54px);display:flex}.main{flex:1;min-width:0;background:#fff;display:flex;flex-direction:column;border-right:2px solid #c5ccd4}.sections{padding:7px 12px;background:#fafcff;border-bottom:1px solid #dce3eb;display:flex;gap:7px;overflow-x:auto}.section{border:1px solid #337ab7;color:#337ab7;background:#fff;padding:7px 12px;border-radius:4px;font-weight:700;white-space:nowrap;cursor:pointer}.section.active{background:#337ab7;color:#fff}.qhead{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;background:#fafafa;border-bottom:1px solid #ddd;color:#28557f;font-weight:700}.qbody{flex:1;overflow:auto;padding:20px;line-height:1.65}.stem{font-size:17px;white-space:normal;margin-bottom:18px}.stem .line{margin:3px 0}.passage{background:#fffaf0;border:1px solid #eedba8;border-left:4px solid #e7a33f;padding:14px;margin-bottom:18px;border-radius:4px;white-space:pre-wrap}.figure{margin:14px 0}.figure img,.option img{display:block;max-width:100%;height:auto;object-fit:contain}.options{display:grid;gap:9px}.option{display:flex;align-items:flex-start;gap:10px;border:1px solid #d8dde4;border-radius:5px;padding:11px;background:#fff;cursor:pointer;min-height:48px;font-size:16px}.option:hover,.option.selected{border-color:#2877c3;background:#eef6ff}.option.correct{border-color:#2f9e44;background:#edf9ef}.option.wrong{border-color:#d64545;background:#fff0f0}.radio{margin-top:5px}.answer{margin-top:16px;border:1px solid #9fd3aa;border-left:5px solid #3a9b50;background:#effaf1;padding:12px;border-radius:4px}.source-link{display:inline-block;margin-top:15px;color:#17689d}.bottom{padding:9px 14px;background:#edf3fa;border-top:1px solid #c8d7e6;display:flex;gap:8px;justify-content:space-between}.group{display:flex;gap:8px}.btn{border:1px solid #337ab7;background:#fff;color:#28689e;padding:8px 13px;border-radius:4px;font-weight:700;cursor:pointer}.btn.primary{background:#337ab7;color:#fff}.btn.answerbtn{background:#e8a53a;border-color:#d89122;color:#fff}.side{width:292px;min-width:292px;background:#fafafa;display:flex;flex-direction:column}.timer{padding:13px 14px;background:#fff;border-bottom:1px solid #ddd;color:#c23131;font-size:16px;font-weight:700}.current-section{padding:8px 14px;background:#e7f3ff;color:#28557f;font-weight:700}.palette-title{padding:11px 14px 5px;font-weight:700}.palette{padding:8px 13px;display:grid;grid-template-columns:repeat(5,1fr);gap:8px;overflow:auto;align-content:start}.qbtn{height:38px;border:1px solid #bcc5ce;background:#fff;border-radius:4px;cursor:pointer;font-weight:700}.qbtn.answered{background:#4daf5c;color:#fff;border-color:#398b45}.qbtn.marked,.qbtn.marked-answered{background:#8f46b6;color:#fff;border-radius:50%}.qbtn.not-answered{background:#df504c;color:#fff;border-color:#cf4541}.qbtn.current{outline:2px solid #155887}.legend{margin-top:auto;padding:10px 14px;border-top:1px solid #ddd;display:grid;grid-template-columns:1fr 1fr;gap:7px;font-size:12px}.legend span b{display:inline-grid;place-items:center;width:22px;height:22px;border:1px solid #bbb;margin-right:5px}.side-actions{padding:8px 12px;display:grid;grid-template-columns:1fr 1fr;gap:7px;border-top:1px solid #ddd}.notice{padding:12px;border:1px solid #e2c777;background:#fff9df;border-radius:4px;margin-bottom:14px}.doc-page{border-bottom:1px solid #ddd;margin-bottom:25px;padding-bottom:20px}.doc-page img{display:block;max-width:100%;height:auto}.modal{display:none;position:fixed;inset:0;background:rgba(0,0,0,.6);z-index:10;align-items:center;justify-content:center}.modal.open{display:flex}.modal-card{background:#fff;width:min(950px,94vw);height:min(86vh,900px);display:flex;flex-direction:column;border-radius:6px;overflow:hidden}.modal-head{background:#28557f;color:#fff;padding:12px 16px;display:flex;justify-content:space-between;font-weight:700}.modal-head button{border:0;background:none;color:#fff;font-size:22px;cursor:pointer}.modal-body{padding:18px;overflow:auto}.allq{padding:15px 0;border-bottom:1px solid #ddd}.index-shell{max-width:1200px;margin:30px auto;padding:0 20px}.index-shell h1{color:#28557f}.filters{display:flex;gap:10px;flex-wrap:wrap;margin:20px 0}.filters input,.filters select{padding:11px;border:1px solid #b9c8d8;border-radius:5px;font:inherit}.filters input{flex:1;min-width:250px}.paper-list{list-style:none;padding:0}.paper-list li{background:#fff;border:1px solid #d9e1ea;border-radius:5px;margin:8px 0}.paper-list a{display:block;padding:14px;text-decoration:none;color:#175f94}.paper-list small{display:block;color:#657486;margin-top:5px}.collection-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:12px}.collection-grid a{padding:18px;background:#fff;border:1px solid #d9e1ea;border-radius:5px;text-decoration:none;color:#175f94}.scan-note{color:#6a4c00}.hidden{display:none!important}
@media(max-width:850px){.topbar{height:auto;min-height:76px;flex-wrap:wrap}.title{order:-1;flex-basis:100%;font-size:14px}.workspace{height:calc(100dvh - 76px)}.side{width:210px;min-width:210px}.palette{grid-template-columns:repeat(4,1fr)}.qbody{padding:14px}.btn{padding:7px 9px;font-size:11px}.bottom{flex-wrap:wrap}}
@media(max-width:600px){body{height:auto;min-height:100dvh;overflow:auto}.workspace{display:block;height:auto}.main{height:80dvh;border-right:0}.side{width:100%;height:auto}.palette{max-height:190px;grid-template-columns:repeat(6,1fr)}.legend{margin-top:0}.stem,.option{font-size:15px}.bottom{position:sticky;bottom:0}.chip{font-size:10px}.modal-card{height:92dvh}.figure img,.option img{max-height:55vh}}