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@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
/* Guided investigation: progression is explicit and future stages stay locked. */
.stage-track{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:3px;list-style:none;margin:0;padding:22px 12px 18px;border-bottom:1px solid var(--border);background:#fcfbff}.stage-track li{min-width:0}.stage-track button{display:flex;flex-direction:column;align-items:center;gap:8px;width:100%;padding:0;background:transparent;color:#a6a0b4}.stage-track button>span{display:grid;place-items:center;width:27px;height:27px;border-radius:50%;border:1px solid #ded9e8;background:#fff;font-size:11px;font-weight:700}.stage-track small{font-size:8px;white-space:nowrap}.stage-track .passed{color:#528d78}.stage-track .passed>span{background:#eaf5ef;border-color:#c7e3d5}.stage-track .current{color:var(--purple);font-weight:700}.stage-track .current>span{background:var(--purple);border-color:var(--purple);color:#fff;box-shadow:0 0 0 4px #eee9fd}.stage-track button[aria-current=step] small{text-decoration:underline;text-underline-offset:4px}.stage-track button:disabled{opacity:.55}.stage-label{font-size:9px;color:var(--purple);font-weight:700;letter-spacing:1.2px;margin-bottom:19px}.incident-intro h2{font-size:17px}.incident-intro>p{font-size:12px;line-height:1.9;color:#716a81}.original-scene{margin:14px 0 23px;border:1px solid #ece7f5;border-radius:8px;padding:12px;font-size:10px;color:#8b7ba1}.original-scene summary{cursor:pointer}.original-scene .source-text{margin-top:16px}.stage-context{background:#f7f4fd;padding:19px;border:1px solid #e9e2f5;border-radius:10px;margin-bottom:25px}.stage-context>span{font-size:8px;letter-spacing:1.4px;font-weight:700;color:#9282ac}.stage-context p{font-size:12px;line-height:1.85;margin:9px 0 0;color:#655575}.evidence-context{background:#30283f;border-color:#30283f}.evidence-context>span{color:#c1abd7}.evidence-context p{color:#e6dfef;font-size:12px;line-height:1.9}.decision-fieldset{border:0;padding:0;margin:0;min-width:0}.decision-fieldset legend{font-family:Manrope,sans-serif;font-size:16px;font-weight:750;line-height:1.6;letter-spacing:-.3px;padding:0;margin-bottom:19px}.answer-options{display:grid;gap:11px}.answer-option{display:flex;align-items:flex-start;gap:11px;border:1px solid #e5deef;border-radius:10px;padding:15px 13px;cursor:pointer;color:#756a83;font-size:12px;line-height:1.75;transition:border-color .15s,background .15s}.answer-option:hover{border-color:#b4a0de;background:#fcfaff}.answer-option input{margin:6px 0 0;accent-color:var(--purple);flex-shrink:0}.answer-letter{display:grid;place-items:center;background:#f2edf9;color:#a18eb9;border-radius:5px;min-width:23px;height:24px;font-size:10px;font-weight:600;margin-top:1px}.answer-option:has(input:checked){background:#f6f2fe;border-color:#a58bd5;color:#59446f}.answer-option.answer-correct{background:#edf7f1;border-color:#b6d9c6;color:#42735d}.answer-option.answer-wrong{background:#fff9ec;border-color:#e9d4a8;color:#8f7445}.decision-fieldset:disabled .answer-option{cursor:default}.check-decision{margin-top:21px}.decision-feedback{padding:18px;border-radius:10px;margin-top:22px}.decision-feedback.correct{background:#edf7f1;border:1px solid #c6e2d2;color:#4b7d66}.decision-feedback.retry{background:#fff8e8;border:1px solid #edddb8;color:#907340}.decision-feedback strong{font-size:12px}.decision-feedback p{font-size:11px;line-height:1.85;margin:8px 0 0}.decision-feedback small{font-size:10px;display:block;margin-top:10px}.stage-footer{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;border-top:1px solid var(--border);padding-top:20px;margin-top:23px}.stage-footer>span{font-size:9px;color:#aa9db8}.stage-footer .locked-note{max-width:240px;font-size:9px;line-height:1.6}.guide-step{border-bottom:1px solid var(--border);padding-bottom:14px;margin-bottom:15px}.guide-step>span{font-size:8px;letter-spacing:1.3px;color:#a797b7}.guide-step strong{display:block;margin-top:9px;font-family:Manrope,sans-serif;font-size:17px;color:#695283}.guide-step p{font-size:11px;line-height:1.9;color:#8c7e9a;margin:11px 0 0}.guide-chain{display:flex;align-items:center;gap:7px;justify-content:space-between;margin:17px 0}.guide-chain span{font-size:9px;border-radius:5px;padding:7px;background:#f5f1fc;color:#9a83b6}.guide-chain b{font-size:12px;transform:rotate(-90deg);color:#b3a3c7}.optional-tutor{margin-top:18px;border-top:1px solid #eee8f6;padding-top:17px}.optional-tutor>summary{font-size:11px;color:#9a88af;cursor:pointer}.optional-tutor p{margin-top:12px}.solved-banner{padding:16px 0 20px}.solved-banner>span{width:43px;height:43px;background:#e8f4ed;display:grid;place-items:center;border-radius:50%;color:#60957d;margin-bottom:20px}.solved-banner h2{font-size:22px;line-height:1.5;margin:10px 0}.solved-banner p{font-size:12px;color:#8b7d98}.diagnosis-summary{padding:22px;background:#f9f7fd;border:1px solid #eae4f3;border-radius:10px;margin-bottom:25px}.diagnosis-summary h3{font-size:12px;color:#755d92;margin-bottom:8px}.diagnosis-summary p{font-size:12px;line-height:1.9;color:#897797;margin-bottom:20px}.diagnosis-summary p:last-child{margin:0}
@media(max-width:700px){.stage-track{padding:19px 8px 15px;gap:0}.stage-track small{font-size:7px;letter-spacing:-.3px}.stage-track button>span{width:24px;height:24px;font-size:10px}.answer-option{font-size:11px;padding:13px 11px;gap:8px}.answer-option input{margin-top:5px}.answer-letter{min-width:20px;height:22px}.decision-fieldset legend{font-size:15px}.stage-context{padding:16px}.stage-context p{font-size:11px}.guided-workbench .lesson-body{padding:19px 16px}.stage-footer .primary{width:100%;justify-content:center}.solved-banner h2{font-size:20px}}
.guided-workbench{scroll-margin-top:20px}.attempt-history{font-size:10px;color:#9786aa;margin-top:18px;border:1px solid #eee7f7;border-radius:8px;padding:12px}.attempt-history summary{cursor:pointer}.attempt-history ol{padding-left:20px}.attempt-history li{line-height:1.8;margin:10px 0}.attempt-history b{font-weight:600}