:root{color:#182235;font-synthesis:none;text-rendering:optimizelegibility;--navy:#0b1739;--blue:#315bea;--blue-soft:#edf2ff;--line:#dfe5ef;--muted:#63708a;--green:#147a5a;--red:#b73b45;background:#f4f7fb;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{min-width:320px;min-height:100vh;margin:0}button,select,input{font:inherit}button{cursor:pointer}button:focus-visible,select:focus-visible,input:focus-visible,a:focus-visible{outline-offset:2px;outline:3px solid #8eabff}.app-shell{min-height:100vh}.app-header{background:var(--navy);color:#fff;z-index:20;justify-content:space-between;align-items:center;height:72px;padding:0 34px;display:flex;position:sticky;top:0;box-shadow:0 3px 14px #07102a22}.brand{align-items:center;gap:12px;display:flex}.brand-mark{background:linear-gradient(145deg,#6d8eff,#315bea);border-radius:11px;place-items:center;width:38px;height:38px;font-size:20px;font-weight:800;display:grid}.brand strong,.brand small{display:block}.brand strong{letter-spacing:.04em}.brand small{color:#aebadc;margin-top:1px}.header-actions{gap:8px;display:flex}.exam-switcher{color:#aebadc;align-items:center;gap:7px;font-size:12px;display:flex}.exam-switcher select{color:#fff;background:#152344;border-color:#415075;width:auto;min-width:104px;padding:8px 30px 8px 10px}.ghost-button{color:#fff;background:#152344;border:1px solid #415075;border-radius:9px;padding:9px 14px}.ghost-button:hover{background:#24345b}.ghost-button.danger{color:#ffc8ca}.progress-track{z-index:19;background:#dce3f1;height:4px;position:sticky;top:72px}.progress-track div{background:linear-gradient(90deg,#315bea,#6f8eff);height:100%;transition:width .25s}.pool-bar{z-index:18;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background:#f4f7fbef;border-bottom:1px solid #e1e7f0;padding:10px 18px;position:sticky;top:76px}.pool-selector{background:#e5eaf3;border-radius:12px;grid-template-columns:repeat(3,1fr);gap:6px;width:min(980px,100%);margin:auto;padding:5px;display:grid}.pool-selector button{color:#4d5a73;background:0 0;border:0;border-radius:8px;padding:9px 12px;font-weight:750}.pool-selector button span{color:#6b7890;background:#fff9;border-radius:999px;margin-left:5px;padding:2px 6px;font-size:11px}.pool-selector button.active{color:#fff;background:var(--blue);box-shadow:0 3px 10px #315bea33}.pool-selector button.active span{color:var(--blue);background:#fff}.pool-selector button:disabled{opacity:.42;cursor:not-allowed}.exam-main{width:min(980px,100% - 36px);margin:36px auto 64px}.question-meta{justify-content:space-between;align-items:flex-end;gap:24px;margin-bottom:16px;display:flex}.eyebrow{text-transform:uppercase;color:var(--blue);letter-spacing:.1em;font-size:12px;font-weight:800}.question-meta h1{color:var(--navy);margin:5px 0 0;font-size:clamp(19px,3vw,25px)}.badges{flex-wrap:wrap;justify-content:flex-end;gap:7px;display:flex}.badges span{white-space:nowrap;color:#43506b;background:#e8edf6;border-radius:999px;padding:6px 10px;font-size:12px}.badges .scope-badge.relevant{color:#126447;background:#dff5eb}.badges .scope-badge.older{color:#76500d;background:#fff0d3}.case-study-button{white-space:nowrap;color:#2549bb;background:#edf2ff;border:1px solid #8aa2ec;border-radius:999px;padding:6px 11px;font-size:12px;font-weight:750}.case-study-button:hover{background:#dfe8ff}.question-card{border:1px solid var(--line);background:#fff;border-radius:18px;overflow:hidden;box-shadow:0 12px 34px #24345b0d}.prompt{white-space:pre-line;border-bottom:1px solid var(--line);padding:clamp(24px,5vw,44px);font-size:17px;line-height:1.7}.section-heading{text-transform:uppercase;letter-spacing:.09em;color:var(--muted);margin-bottom:14px;font-size:12px;font-weight:800}.source-visuals{border-bottom:1px solid var(--line);background:#fbfcff;padding:24px clamp(24px,5vw,44px)}.image-stack,.answer-images{gap:12px;display:grid}.image-button{width:100%;color:var(--muted);background:#fff;border:1px solid #d9e0ec;border-radius:12px;padding:8px;display:block}.image-button img{object-fit:contain;background:#fff;width:100%;max-height:620px;display:block}.image-button span{padding:7px 4px 2px;font-size:12px;display:block}.response-section{padding:clamp(24px,5vw,44px)}.choices{border:0;gap:10px;margin:0;padding:0;display:grid}.choices legend{clip:rect(0 0 0 0);width:1px;height:1px;position:absolute;overflow:hidden}.choice{cursor:pointer;border:1px solid #dce3ef;border-radius:12px;grid-template-columns:auto 34px 1fr;align-items:center;gap:11px;padding:15px 16px;line-height:1.45;transition:border-color .15s,background .15s,transform .15s;display:grid}.choice:hover{border-color:#99adee;transform:translateY(-1px)}.choice.selected{border-color:var(--blue);background:var(--blue-soft)}.choice input{width:18px;height:18px;accent-color:var(--blue)}.choice-letter{color:#4b5872;background:#eef1f7;border-radius:8px;place-items:center;width:30px;height:30px;font-weight:800;display:grid}.choice.selected .choice-letter{background:var(--blue);color:#fff}.response-grid,.ordering{gap:10px;display:grid}.response-row,.order-row{border:1px solid #dde4ef;border-radius:12px;grid-template-columns:minmax(220px,1fr) minmax(230px,.8fr);align-items:center;gap:16px;padding:14px;display:grid}.row-label{line-height:1.45}select{color:#182235;background:#fff;border:1px solid #bbc5d6;border-radius:9px;width:100%;padding:11px 36px 11px 12px}.text-answer{color:#182235;background:#fff;border:1px solid #bbc5d6;border-radius:9px;width:100%;padding:11px 12px}.segmented{justify-content:flex-end;gap:6px;display:flex}.segmented label{text-align:center;cursor:pointer;border:1px solid #cbd3e0;border-radius:9px;min-width:76px;padding:9px 13px}.segmented label.active{color:#fff;background:var(--blue);border-color:var(--blue)}.segmented input{opacity:0;position:absolute}.order-row{grid-template-columns:38px 1fr auto}.order-number{background:var(--navy);color:#fff;border-radius:50%;place-items:center;width:34px;height:34px;font-weight:800;display:grid}.order-buttons{gap:5px;display:flex}.order-buttons button{background:#f6f8fc;border:1px solid #c6cfde;border-radius:8px;width:38px;height:38px}.order-buttons button:disabled{opacity:.35;cursor:default}.answer-panel{border-top:1px solid var(--line);background:#f8fbff;padding:clamp(24px,5vw,44px)}.answer-panel.correct{background:#f3fbf7;border-top-color:#b9e4d3}.answer-panel.incorrect{background:#fff8f8;border-top-color:#f0c6ca}.answer-panel.unresolved{background:#fffaf0;border-top-color:#ead4a5}.result-line{align-items:flex-start;gap:14px;display:flex}.result-line p{color:var(--muted);margin:4px 0 0}.result-icon{background:var(--navy);color:#fff;border-radius:50%;flex:0 0 34px;place-items:center;width:34px;height:34px;font-weight:900;display:grid}.correct .result-icon{background:var(--green)}.incorrect .result-icon{background:var(--red)}.unresolved .result-icon{background:#a66c00}.verified-answer{border-left:4px solid var(--blue);background:#fffa;margin:22px 0 18px;padding:10px 16px}.verified-answer span{text-transform:uppercase;letter-spacing:.08em;color:var(--blue);font-size:11px;font-weight:800}.verified-answer p{margin:5px 0;font-weight:700;line-height:1.5}.answer-images{margin:18px 0}.answer-panel details{border-top:1px solid #d8dfeb;padding-top:16px}.answer-panel summary{cursor:pointer;font-weight:800}.explanation{white-space:pre-line;line-height:1.65}.verification-note{background:#fff1cd;border:1px solid #ebd394;border-radius:9px;padding:12px 14px;font-size:14px;line-height:1.45}.syllabus-detail{background:#fff;border:1px solid #cfd9ea;border-radius:10px;margin-top:18px;padding:15px 16px;line-height:1.5}.syllabus-detail.relevant{border-left:4px solid var(--green)}.syllabus-detail.older{border-left:4px solid #a66c00}.syllabus-detail p,.syllabus-detail ul{margin:8px 0 0}.syllabus-detail ul{padding-left:20px}.syllabus-detail code{color:#415170;background:#edf1f7;border-radius:5px;padding:2px 5px;font-size:11px}.classification-meta{color:var(--muted);margin-top:9px;font-size:12px}.reference-list{flex-wrap:wrap;gap:8px;margin-top:16px;display:flex}.reference-list a{color:#264fc5;background:#fff;border:1px solid #d5ddea;border-radius:8px;padding:7px 10px;font-size:13px;text-decoration:none}.navigation{grid-template-columns:1fr auto 1fr;align-items:center;gap:12px;margin-top:20px;display:grid}.navigation button{border-radius:11px;min-height:48px;padding:0 18px;font-weight:750}.secondary-button{color:#35415a;background:#fff;border:1px solid #cfd7e4;justify-self:start}.secondary-button:disabled{opacity:.45;cursor:default}.show-button{color:var(--blue);background:0 0;border:0}.primary-button{color:#fff;background:var(--blue);border:1px solid var(--blue);justify-self:end;box-shadow:0 5px 14px #315bea33}.primary-button:hover{background:#234bcc}.keyboard-hint{text-align:center;color:#7b879e;margin-top:14px;font-size:12px}.keyboard-hint kbd{background:#fff;border:1px solid #ced6e2;border-bottom-width:2px;border-radius:5px;padding:2px 6px}.keyboard-hint span{padding:0 7px}.picker{z-index:30;background:#fff;border:1px solid #d8dfeb;border-radius:15px;width:min(460px,100% - 40px);max-height:calc(100vh - 104px);padding:18px;position:fixed;top:84px;right:20px;overflow:auto;box-shadow:0 20px 60px #07102a33}.picker-header{justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:14px;display:flex}.picker-header strong,.picker-header span{display:block}.picker-header span{color:var(--muted);margin-top:3px;font-size:13px}.picker-header button{color:var(--muted);background:0 0;border:0;font-size:26px}.question-grid{grid-template-columns:repeat(10,1fr);gap:5px;display:grid}.question-grid button{aspect-ratio:1;color:#526078;background:#f8f9fc;border:1px solid #dce2ed;border-radius:7px;padding:0;font-size:11px}.question-grid button.current{color:#fff;background:var(--blue);border-color:var(--blue)}.question-grid button.q-answered:not(.current){background:#e8edff;border-color:#9eb0ee}.question-grid button.q-revealed:not(.current){background:#fff0d3;border-color:#e8c57a}.question-grid button.q-correct:not(.current){background:#dff5eb;border-color:#83ceb0}.case-study-backdrop{z-index:42;background:#07102a66;justify-content:flex-end;display:flex;position:fixed;inset:0}.case-study-backdrop>div{width:min(720px,94vw);height:100%}.case-study-panel{background:#f7f9fd;width:100%;height:100%;padding:24px;overflow:auto;box-shadow:-18px 0 55px #07102a44}.case-study-header{z-index:2;color:#fff;background:var(--navy);justify-content:space-between;align-items:flex-start;gap:18px;margin:-24px -24px 18px;padding:22px 24px 18px;display:flex;position:sticky;top:-24px}.case-study-header span{color:#9fb1df;text-transform:uppercase;letter-spacing:.08em;font-size:11px;font-weight:800}.case-study-header h2{margin:4px 0 0;font-size:21px}.case-study-header button{color:#fff;background:#ffffff12;border:1px solid #fff5;border-radius:50%;flex:0 0 40px;width:40px;height:40px;font-size:25px}.case-study-pages{color:var(--muted);font-size:13px}.case-study-images{gap:15px;display:grid}.case-study-images .image-button img{max-height:none}.lightbox{z-index:50;background:#07102aeb;place-items:center;padding:30px;display:grid;position:fixed;inset:0}.lightbox img{object-fit:contain;background:#fff;border-radius:8px;max-width:96vw;max-height:92vh;box-shadow:0 20px 80px #0008}.lightbox button{color:#fff;z-index:2;background:#ffffff1f;border:1px solid #fff5;border-radius:50%;width:44px;height:44px;font-size:28px;position:fixed;top:18px;right:24px}@media (width<=720px){.app-header{padding:0 16px}.brand small,.exam-switcher span{display:none}.exam-switcher select{min-width:94px}.ghost-button{padding:8px 10px}.exam-main{width:min(100% - 20px,980px);margin-top:22px}.pool-bar{padding:8px 10px}.pool-selector button{padding:8px 5px;font-size:13px}.question-meta{flex-direction:column;align-items:flex-start;gap:10px}.badges{justify-content:flex-start}.response-row{grid-template-columns:1fr;gap:10px}.segmented{justify-content:stretch}.segmented label{flex:1}.navigation{grid-template-columns:1fr 1fr}.show-button{grid-area:2/1/auto/-1}.question-grid{grid-template-columns:repeat(8,1fr)}.prompt{font-size:16px}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition:none!important}}