:root{font-family:"Microsoft YaHei",system-ui,sans-serif;color:#172033;background:#f3f6fa;line-height:1.65}*{box-sizing:border-box}body{margin:0;min-height:100vh}.shell{width:min(760px,calc(100% - 28px));margin:32px auto}.card{background:#fff;border:1px solid #dfe6ef;border-radius:14px;padding:clamp(20px,5vw,38px);box-shadow:0 8px 30px rgba(25,50,90,.07)}h1{font-size:1.55rem;margin:0 0 22px}h2{font-size:1.22rem;margin:0 0 18px}.muted{color:#667085}.notice{padding:14px 16px;background:#f1f7ff;border-left:4px solid #3978d4;border-radius:6px;margin:18px 0}.error{color:#a52222;background:#fff0f0;padding:10px;border-radius:6px}.actions{display:flex;gap:12px;justify-content:flex-end;margin-top:24px}.btn{border:0;border-radius:8px;padding:11px 23px;font-size:1rem;cursor:pointer}.primary{background:#2467c9;color:#fff}.primary:disabled{opacity:.45;cursor:not-allowed}.secondary{background:#e9eef5;color:#263247}.field{margin:18px 0}.field>label,.legend{display:block;font-weight:600;margin-bottom:8px}.options{display:grid;gap:9px}.option{display:flex;align-items:flex-start;gap:9px;padding:10px 12px;border:1px solid #d9e1eb;border-radius:8px;cursor:pointer}.option:has(input:checked){border-color:#3978d4;background:#f2f7ff}.image-wrap{display:flex;justify-content:center;align-items:center;width:min(88vw,560px,62vh);aspect-ratio:1/1;margin-inline:auto;background:#f8fafc;border-radius:10px;padding:16px;overflow:hidden}.stimulus{width:100%;height:100%;object-fit:contain}.progress{height:7px;background:#e6ebf2;border-radius:9px;overflow:hidden;margin-bottom:18px}.progress>span{display:block;height:100%;background:#3978d4}.confidence{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}.confidence label{text-align:center;padding:8px 3px;border:1px solid #d9e1eb;border-radius:7px}.confidence label:has(input:checked){background:#eaf2ff;border-color:#3978d4}.confidence input{display:block;margin:0 auto 4px}.saving{font-size:.9rem;color:#667085;text-align:right;min-height:1.5em}.timer{font-size:2.3rem;font-weight:700;text-align:center;color:#2467c9;margin:26px}.center{text-align:center}@media(max-width:540px){.shell{margin:12px auto;width:min(100% - 16px,760px)}.card{padding:20px 16px}.image-wrap{width:min(calc(100vw - 48px),68vh);padding:10px}.actions{justify-content:stretch}.btn{flex:1}}