:root{--ink:#192d29;--green:#123d36;--muted:#65726e;--paper:#f5f7f4;--line:#dde4de;--red:#b52830;--yellow:#e9f09a;--white:#fff;font-family:"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);font-size:16px}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;min-height:48px;border:1px solid var(--line);border-radius:12px;background:white;color:var(--ink);padding:12px 16px;font-weight:600}button:disabled{opacity:.45;cursor:default}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #b39320;outline-offset:3px}header{max-width:900px;margin:auto;padding:22px 24px;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:9px;font-size:19px;font-weight:750}.brand small{font-weight:400;font-size:13px;color:var(--muted);border-left:1px 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var(--line);border-radius:18px;padding:24px;color:var(--ink)}dialog::backdrop{background:#09231bc0}dialog .primary{width:100%;margin-top:20px}#toast{position:fixed;bottom:105px;left:50%;transform:translateX(-50%);max-width:90%;background:var(--green);color:#fff;padding:12px 18px;border-radius:12px;z-index:20;display:none;font-size:14px}.note{font-size:13px;line-height:1.7;color:var(--muted);margin-top:22px}.loading{padding:60px 0;text-align:center}.sr{position:absolute;clip:rect(0,0,0,0);width:1px;height:1px;overflow:hidden}.sessioncontrols{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.sessioncontrols button{min-height:44px;padding:8px 12px}.source{font-size:12px;color:var(--muted)}@media(max-width:420px){header{padding:18px 18px}main{padding:12px 18px 115px}.panel{padding:18px}.question{font-size:20px}.grid{gap:9px}.topic{padding:15px 12px}.brand small{font-size:12px}.stat 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.option:disabled{opacity:1}