:root{color:#172033;background:#f4f7fb;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-synthesis:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh}button{font:inherit}.app-shell{width:min(1180px,calc(100% - 32px));margin:0 auto;padding:32px 0 56px}.topbar,.exam-picker,.exam-header,.result-band{display:grid;gap:20px}.topbar{grid-template-columns:1fr auto;align-items:start;margin-bottom:28px}.eyebrow{margin:0 0 8px;color:#5d6b82;font-size:.78rem;font-weight:800;letter-spacing:0;text-transform:uppercase}h1,h2{margin:0;color:#111827;line-height:1.08}h1{max-width:780px;font-size:clamp(2rem,4vw,4.4rem)}h2{font-size:clamp(1.45rem,2vw,2.1rem)}.status-pill,.set-count,.level{display:inline-flex;align-items:center;border:1px solid #d7dfeb;border-radius:999px;background:#fff;color:#42526a;font-size:.84rem;font-weight:800;min-height:34px;padding:0 14px;white-space:nowrap}.status-pill.live{border-color:#96d6bd;background:#e8f8f0;color:#16633f}.exam-picker{grid-template-columns:minmax(0,1fr) 330px;align-items:start}.panel,.start-panel,.question-card{border:1px solid #dbe3ef;border-radius:8px;background:#fff;box-shadow:0 16px 40px #1f293714}.panel,.start-panel{padding:24px}.panel-heading,.exam-header,.result-band{grid-template-columns:1fr auto;align-items:center}.set-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:14px;margin-top:22px}.set-card{display:grid;min-height:190px;gap:12px;border:1px solid #dbe3ef;border-radius:8px;background:#fbfdff;color:#172033;padding:18px;text-align:left;cursor:pointer;transition:border-color .2s ease,box-shadow .2s ease,transform .2s ease}.set-card:hover,.set-card.selected{border-color:#376fd0;box-shadow:0 12px 26px #376fd029;transform:translateY(-2px)}.set-card strong{font-size:1.12rem}.set-card span:not(.level),.set-card small,.start-panel p,.muted,.notice{color:#64748b;line-height:1.55}.level{width:max-content;border-color:#fad7a1;background:#fff5df;color:#925d05}.start-panel{position:sticky;top:20px}.primary-button,.ghost-button{display:inline-flex;align-items:center;justify-content:center;min-height:46px;border-radius:8px;border:0;padding:0 18px;font-weight:850;cursor:pointer}.primary-button{width:100%;margin-top:18px;background:#2663c7;color:#fff}.primary-button:disabled{background:#a9b7ca;cursor:not-allowed}.ghost-button{border:1px solid #d7dfeb;background:#fff;color:#172033}.exam-board{display:grid;gap:20px}.exam-header{grid-template-columns:auto 1fr auto;border-bottom:1px solid #d7dfeb;padding-bottom:18px}.progress-box{display:grid;justify-items:end;gap:2px}.progress-box span,.result-band strong{color:#2663c7;font-size:2rem;font-weight:900}.progress-box small{color:#64748b}.result-band{border:1px solid #b7e4cd;border-radius:8px;background:#edf9f2;padding:22px}.question-list{display:grid;gap:16px}.question-card{display:grid;gap:18px;padding:22px}.question-title{display:grid;gap:8px}.question-title span{color:#5d6b82;font-size:.82rem;font-weight:800}.question-title strong{color:#111827;font-size:1.16rem}.option-list{display:grid;gap:10px}.option-button{display:grid;grid-template-columns:34px 1fr;align-items:center;min-height:52px;border:1px solid #dbe3ef;border-radius:8px;background:#fff;color:#172033;padding:9px 12px;text-align:left;cursor:pointer}.option-button span{display:inline-grid;width:26px;height:26px;place-items:center;border-radius:50%;background:#eef3f9;color:#42526a;font-size:.82rem;font-weight:900}.option-button.chosen{border-color:#2663c7;background:#eef5ff}.option-button.correct{border-color:#31a66a;background:#edf9f2}.option-button.wrong{border-color:#dc4c4c;background:#fff0f0}.explanation{margin:0;border-left:4px solid #2663c7;background:#f4f8ff;color:#42526a;padding:12px 14px;line-height:1.5}.submit-button{justify-self:end;width:min(260px,100%)}@media(max-width:780px){.app-shell{width:min(100% - 24px,1180px);padding-top:20px}.topbar,.exam-picker,.exam-header,.result-band{grid-template-columns:1fr}.start-panel{position:static}.progress-box{justify-items:start}}