:root{color-scheme:dark;--bg:#091215;--panel:#101e23;--line:#26393f;--muted:#9aafb5;--text:#eaf3ef;--mint:#b9edb0;--cyan:#7dd6ec;--warn:#ffd18b}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,Segoe UI,Arial,sans-serif;font-size:14px}header{padding:24px 4vw;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:36px}a{color:inherit;text-decoration:none}header>a:last-child{margin-left:auto;font-size:13px}.brand{font-weight:800;letter-spacing:2px;line-height:1.1}.brand span{display:block;color:var(--mint);font-size:11px;letter-spacing:4px}.edition,.eyebrow{font-size:10px;letter-spacing:2px;font-weight:700;color:var(--muted)}main{max-width:1480px;margin:auto;padding:0 4vw}.intro{display:flex;justify-content:space-between;align-items:center;gap:32px;padding:38px 0 30px}h1{font-size:64px;letter-spacing:-3px;margin:6px 0 12px;font-weight:600}h1 em{font-style:normal;color:var(--mint)}h1 sup{font-size:16px;vertical-align:top;letter-spacing:0;color:var(--muted);margin:12px}p{color:var(--muted);line-height:1.65;margin:10px 0}.intro p{font-size:16px}.casepanel{width:370px;background:var(--panel);padding:22px;border:1px solid var(--line);border-radius:12px}.casepanel>label{font-size:10px;letter-spacing:2px;color:var(--muted)}select,button{font:inherit;color:var(--text);border:1px solid #385057;background:#15282e;border-radius:7px;padding:10px 12px;cursor:pointer}select{max-width:100%}button:hover{border-color:var(--mint);background:#20383d}button:focus-visible,select:focus-visible,canvas:focus-visible,summary:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}button[aria-pressed=true],button.active{color:#102118;background:var(--mint);border-color:var(--mint)}button:disabled{cursor:not-allowed;opacity:.4}.casepanel>select{display:block;width:100%;margin:12px 0}.row{display:flex;gap:8px}.row button{font-size:12px}.facts{display:flex;gap:16px;padding-top:18px;color:var(--mint);font-size:12px}nav{display:flex;gap:8px;margin-bottom:16px}nav button{flex:1;text-align:left;padding:16px;font-size:14px}nav button span{margin-right:12px;opacity:.6}.workspace{display:grid;grid-template-columns:1fr 1fr;gap:18px;align-items:start}.machine,.spectral{background:var(--panel);border:1px solid var(--line);border-radius:12px;overflow:hidden}.panelhead{display:flex;justify-content:space-between;padding:17px 18px;font-size:10px;letter-spacing:1.5px;border-bottom:1px solid var(--line);color:var(--muted)}.led{display:inline-block;width:6px;height:6px;background:var(--mint);border-radius:50%;margin-right:7px}.toolbar{padding:12px;display:flex;gap:7px;align-items:center;flex-wrap:wrap}.toolbar button,.toolbar select{font-size:11px;padding:8px}.inline{display:flex;gap:6px;align-items:center;color:var(--muted);font-size:11px}canvas{display:block;width:100%;height:auto;background:#03090c;touch-action:none;cursor:crosshair}.status{padding:12px 16px;color:var(--cyan);font-size:12px;border-top:1px solid var(--line);min-height:54px;line-height:1.5}.controls{padding:10px 16px;display:grid;grid-template-columns:1fr 1fr;gap:16px}.controls label{font-size:11px;color:var(--muted)}output{float:right;color:var(--text)}input[type=range]{display:block;width:100%;margin:12px 0 3px;accent-color:var(--cyan)}.small{font-size:11px;line-height:1.5;color:var(--warn);padding:4px 16px 16px;min-height:36px}.measurement{margin:0 14px;padding:14px;background:#0b171c;border-radius:6px;line-height:1.6;color:var(--cyan);min-height:64px;font-size:12px}.lesson{padding:24px 20px}h2{font-size:21px;margin:10px 0;font-weight:500}.lesson p{font-size:13px}.answers{display:grid;gap:7px}.answers button{text-align:left;font-size:12px}#feedback{line-height:1.6;margin-top:12px;font-size:13px}.success{color:var(--mint)}.error{color:var(--warn)}.assessment{display:grid;grid-template-columns:1fr 1fr;gap:32px;border:1px solid var(--line);border-radius:12px;padding:26px;margin:22px 0;background:linear-gradient(110deg,#172b2d,#101e23)}#summary{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}#summary span{padding:8px 10px;border:1px solid var(--line);border-radius:5px;font-size:11px;color:var(--muted)}.grades{display:flex;gap:10px;margin-bottom:14px}.grades button{width:58px;height:54px;font-size:22px}#gradeFeedback{font-size:13px;line-height:1.6;color:var(--muted)}#next{margin-top:14px}details{border-top:1px solid var(--line);padding:22px 0}summary{cursor:pointer;font-size:13px}.referencegrid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px;font-size:12px}.referencegrid a{color:var(--cyan)}h3{font-size:14px}footer{padding:26px 0 36px;display:flex;justify-content:space-between;color:var(--muted);font-size:10px;letter-spacing:1px}@media(min-width:1600px){main{padding:0 32px}}@media(max-width:950px){.workspace{grid-template-columns:1fr}.intro{align-items:start}.intro h1{font-size:52px}.casepanel{width:340px}.edition{display:none}}@media(max-width:600px){header{padding:18px 5vw}.intro{display:block;padding-top:28px}.casepanel{width:100%;margin-top:22px}main{padding:0 4vw}nav button{font-size:11px;padding:12px 6px}nav button span{display:block;margin:0 0 5px}.assessment,.referencegrid{grid-template-columns:1fr}.intro h1{font-size:54px}.assessment{padding:20px;gap:20px}footer{display:block;line-height:2.2}footer span{display:block}.toolbar{gap:5px}}

/* Compact workstation for the portal study. */
.intro{padding:22px 0 20px}.intro h1{font-size:46px;margin:5px 0}.intro p{font-size:13px;margin:4px 0}.casepanel{padding:14px 18px}.casepanel .facts{padding-top:10px}header{padding-top:16px;padding-bottom:16px}.measurement{min-height:78px}

.session-note{font-size:12px;max-width:850px;margin:0 0 14px} @media(pointer:coarse){.toolbar button,.toolbar select{min-height:44px}.controls input{min-height:30px}}

.sample-control{display:block;padding:10px 16px;font-size:12px;color:var(--muted)}.sample-control span{font-size:10px}.concept-task{margin-top:20px;padding-top:15px;border-top:1px solid var(--line)}.concept-task a{color:var(--cyan);font-size:11px}[hidden]{display:none!important}
.rights-notice{font-size:12px;line-height:1.7;color:#9aafb5;padding:0 0 28px}.rights-notice a{text-decoration:underline}