:root{font-family:system-ui,-apple-system,"Microsoft YaHei",sans-serif;color:#172b43;background:#f1f5fa;font-synthesis:none;--blue:#185dcb;--muted:#596b80;--border:#d8e1eb;--green:#187546}*{box-sizing:border-box}body{margin:0}header{height:76px;padding:0 max(24px,calc((100vw - 1140px)/2));display:flex;align-items:center;justify-content:space-between;background:#fff;border-bottom:1px solid var(--border)}a{color:var(--blue)}.brand{font-weight:800;font-size:22px;text-decoration:none;color:#172b43}.brand span{color:var(--blue);margin-left:5px}.badge,.pill{display:inline-block;padding:5px 12px;border-radius:30px;background:#e9eff7;color:#415670;font-size:14px}main{max-width:1188px;margin:32px auto;padding:0 24px 48px}main.student{max-width:640px}h1{font-size:30px;margin:6px 0 18px;line-height:1.35}h2{font-size:21px;margin:0 0 16px}h3{font-size:18px;margin:0 0 12px}p{line-height:1.65;color:var(--muted);margin:10px 0}.eyebrow{font-size:14px;font-weight:700;color:var(--blue);margin:0 0 6px}.card{background:#fff;border:1px solid var(--border);border-radius:18px;padding:26px;margin-bottom:22px}.grid{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:24px}.row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.spread{justify-content:space-between}.fields{display:grid;grid-template-columns:1fr 1fr;gap:18px}.field{display:flex;flex-direction:column;gap:8px;margin-bottom:16px}label{font-size:15px;font-weight:600}input,select,button{font:inherit;font-size:16px}input,select{border:1px solid #aebfd1;border-radius:9px;padding:11px 12px;background:white;color:inherit;max-width:100%;min-width:0}input:focus,select:focus,button:focus-visible,a:focus-visible{outline:3px solid #a7cdfc;outline-offset:2px}button,.button{border:0;border-radius:9px;min-height:46px;padding:11px 18px;font-weight:650;cursor:pointer;background:var(--blue);color:#fff;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:8px}button:hover,.button:hover{filter:brightness(.94)}button:disabled{opacity:.45;cursor:not-allowed}.secondary{background:#eaf0f7;color:#234568}.danger{background:#fff0eb;color:#a03721}.small{font-size:14px;padding:8px 12px;min-height:36px}.full{width:100%}.muted{color:var(--muted);font-size:14px}.status{font-size:15px;color:var(--green);font-weight:650}.empty{text-align:center;padding:34px 16px;background:#f7f9fc;border:1px dashed #c6d3e0;border-radius:12px}.question{border:1px solid var(--border);border-radius:12px;padding:22px;margin:16px 0;background:#fff}.question.active{border:2px solid var(--blue);background:#f7faff}.qnum{font-size:30px;font-weight:800;letter-spacing:-.5px}.timer{font-size:27px;color:var(--blue);font-weight:750;font-variant-numeric:tabular-nums}.choices{display:flex;gap:12px;margin:20px 0}.choice{flex:1;position:relative}.choice input{position:absolute;opacity:0;width:1px;height:1px}.choice span{display:flex;align-items:center;justify-content:center;border:2px solid #c2d0df;border-radius:12px;height:70px;font-size:26px;font-weight:750;background:#fff;cursor:pointer}.choice input:checked+span{background:#185dcb;color:#fff;border-color:#185dcb}.choice input:focus-visible+span{outline:3px solid #91bffc;outline-offset:2px}.choice input:disabled+span{opacity:.5;cursor:default}.submitted{color:var(--green);background:#edf8f0;border-radius:10px;padding:13px 16px;font-weight:650}.waiting{padding:20px;border-radius:12px;background:#eaf1fb;margin:18px 0}.metric{font-size:38px;font-weight:800;color:#172b43}.bar-row{display:grid;grid-template-columns:20px 1fr 45px;align-items:center;gap:12px;margin:15px 0}.bar-track{height:15px;background:#eef2f7;border-radius:5px;overflow:hidden}.bar-fill{height:100%;background:#397dde;min-width:0;transition:width .2s}.bar-row.correct .bar-fill{background:#228653}table{border-collapse:collapse;width:100%;font-size:14px}th,td{text-align:left;border-bottom:1px solid #e6ecf3;padding:12px 10px;white-space:nowrap}th{color:var(--muted);font-weight:600}.scroll{overflow:auto}.qr svg{display:block;width:210px;max-width:100%;height:auto;margin:20px auto}.qr{text-align:center}.address{display:block;overflow-wrap:anywhere;font-size:14px;margin:12px 0}details summary{cursor:pointer;font-weight:650;padding:10px 0}.history-item{display:flex;justify-content:space-between;gap:15px;border-top:1px solid #e6ecf3;padding:14px 0}.link-button{background:none;color:var(--blue);padding:5px;min-height:auto}.info{border-left:3px solid #6c9cd7;padding:5px 14px;font-size:14px}#notice{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);max-width:90vw;background:#18304a;color:#fff;padding:13px 22px;border-radius:10px;display:none;z-index:10}.error{color:#a03721;background:#fff0eb;border-radius:8px;padding:10px 14px}.gap-top{margin-top:20px}.rule{border:0;border-top:1px solid var(--border);margin:22px 0}.nowrap{white-space:nowrap}@media(max-width:820px){.grid{grid-template-columns:1fr}.grid aside{order:2}main{margin-top:22px}header{padding:0 20px}.card{padding:22px}}@media(max-width:480px){main{padding:0 14px 30px}.card{padding:20px}.fields{grid-template-columns:1fr;gap:0}h1{font-size:26px}.row.mobile-stack{align-items:stretch;flex-direction:column}.choices{gap:8px}.choice span{height:64px}.question{padding:18px}.qnum{font-size:27px}}
.session-list{display:grid;gap:10px;margin-top:8px}
.session-choice{display:flex;flex-direction:column;align-items:flex-start;gap:4px;width:100%;text-align:left;background:#fff;border:2px solid #c2d0df;border-radius:12px;padding:14px 16px;min-height:64px;box-shadow:none;color:inherit}
.session-choice strong{font-size:18px}
.session-choice span{color:var(--muted);font-size:13px;font-weight:500}
.session-choice.selected{border-color:#185dcb;background:#eaf1fb}
.label-text{display:block;margin-bottom:6px;font-weight:650}