:root{font-family:Inter,Microsoft YaHei,system-ui,sans-serif;color:#e8f3ff;background:#07152e;font-synthesis:none}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:radial-gradient(ellipse at 10% 5%,#284d86 0,transparent 45%),radial-gradient(ellipse at 90% 30%,#134b62 0,transparent 40%),linear-gradient(160deg,#07152e,#101c47 68%,#082b48)}button,select{font:inherit}button{cursor:pointer;color:inherit;border:1px solid #ffffff44;background:#fff1;padding:12px 18px;border-radius:12px}button:disabled{opacity:.45;cursor:not-allowed}button:hover:not(:disabled){background:#fff2}.shell{max-width:960px;margin:auto;padding:32px 22px 70px}.masthead{display:flex;justify-content:space-between;align-items:flex-start;gap:18px;padding:34px 8px}.eyebrow{font-size:12px;letter-spacing:.13em;font-weight:750;color:#9cd9fb}.masthead h1{font-size:40px;margin:8px 0}.masthead p,.muted{color:#cad9ee;line-height:1.7}.labmark{padding:8px 12px;border:1px solid #ffffff40;border-radius:99px;color:#b0d6f2;font-size:12px}.nav{display:flex;justify-content:space-between;align-items:center;gap:15px;margin:0 0 18px}.nav span{color:#abcee9;font-size:13px}.nav button.active{border-color:#9bd9ff}.glass{padding:26px 30px;margin:16px 0;border:1px solid #ffffff35;background:linear-gradient(145deg,#25466c9e,#0c2048d1);border-radius:22px;box-shadow:0 14px 45px #0004;-webkit-backdrop-filter:blur(15px);backdrop-filter:blur(15px)}h2{margin:6px 0 14px;font-size:23px}h3{margin:14px 0 10px}.dates{margin-top:24px}.dates h3{font-size:15px;color:#cbe5ff}.session-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:11px}.lesson{display:flex;flex-direction:column;gap:9px;text-align:left;padding:16px;background:#ffffff0e}.lesson.selected{border-color:#91d7ff;background:#3c75a744}.lesson span,.lesson small{color:#a6cde7;font-size:12px}.lesson strong{font-size:15px}.section-title{display:flex;justify-content:space-between;gap:12px;align-items:center}.count{font-size:12px;color:#bedaff}.filters{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:22px 0}.filters label{display:grid;gap:7px;font-size:13px;color:#d3e8fc}.filters select{border:1px solid #d9e9ff48;background:#163455;color:#fff;border-radius:10px;padding:11px;max-width:100%}.actions{display:flex;gap:10px;flex-wrap:wrap;justify-content:flex-end;margin-top:18px}.primary{background:linear-gradient(120deg,#5597cb,#787ecb);font-weight:700;border-color:#addcff88}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.stats div{border:1px solid #ffffff26;border-radius:14px;background:#ffffff12;padding:18px;display:grid;gap:4px;text-align:center}.stats b{font-size:26px}.stats small,.mini,footer{color:#accee8;font-size:12px}.question{font-size:clamp(20px,3vw,28px);margin:24px 0}.progress{height:7px;background:#ffffff21;border-radius:20px;margin:18px 0;overflow:hidden}.progress div{height:100%;background:#8fcefb}.topic-tags{display:flex;gap:6px;flex-wrap:wrap}.topic-tags span{font-size:12px;border:1px solid #b8e7ff55;color:#bae1ff;border-radius:20px;padding:5px 10px}.choices{display:grid;gap:10px;margin:24px 0}.choices button{display:flex;align-items:center;gap:14px;text-align:left;width:100%;min-height:56px}.choices button span{flex:1}.choices b{display:grid;place-items:center;border:1px solid #ffffff45;width:30px;height:30px;border-radius:8px}.choices .correct{background:#297b6a88;border-color:#6de5bc}.choices .incorrect{background:#86475688;border-color:#ffb1af}.reveal{padding:18px;border-radius:15px;background:#162f5799;border-left:3px solid #9ad9ff}.reveal p{line-height:1.7}.explain-opt{padding:10px 0;border-bottom:1px solid #ffffff19}.explain-opt p{margin:7px 0 0;font-size:14px;color:#c9daec}.right{color:#82e8bd;font-size:12px}.result{text-align:center}.score{font-size:75px;font-weight:900;color:#b9ebff}.miss{text-align:left;border:1px solid #ffffff3b;border-radius:10px;padding:15px;margin:10px 0}.miss small{display:block;color:#9fc9e5;margin-top:8px}.error{padding:12px;background:#86465377;border-radius:12px}.empty{padding:26px;color:#b8d8f0;text-align:center}footer{text-align:center;margin-top:25px}@media(max-width:600px){.shell{padding:12px 12px 40px}.masthead{padding:22px 2px;flex-direction:column}.masthead h1{font-size:30px}.glass{padding:18px}.filters{grid-template-columns:1fr}.stats{gap:6px}}progress.progress{display:block;width:100%;appearance:none;border:0}progress.progress::-webkit-progress-bar{background:#ffffff21}progress.progress::-webkit-progress-value{background:#8fcefb}progress.progress::-moz-progress-bar{background:#8fcefb}.course-select-wrap{margin-top:25px}.course-select-label{display:block;font-size:15px;font-weight:700;color:#cee8ff;margin-bottom:11px}.course-picker{display:block;width:100%;min-height:70px;border-radius:16px;border:1px solid #92cfff90;background:#193e64;color:#f2f8ff;padding:16px 20px;font-size:18px;font-weight:650;cursor:pointer;box-shadow:0 6px 25px #0002}.course-picker:focus-visible{outline:3px solid #8bd3ff;outline-offset:3px}.course-picker:disabled{opacity:.55;cursor:wait}.course-picker optgroup,.course-picker option{background:#143052;color:#f2f8ff;font-size:16px;font-weight:400}.course-selection-details{display:flex;flex-direction:column;gap:7px;margin-top:14px;padding:14px 17px;background:#ffffff0b;border-radius:12px;border:1px solid #ffffff22;overflow-wrap:anywhere}.course-selection-details strong{font-size:16px}.course-selection-details span{font-size:13px;color:#b4d8f1}@media(max-width:600px){.course-picker{min-height:64px;font-size:16px;padding:14px}.course-selection-details strong{font-size:15px}}