.atlas-heading{display:flex;align-items:center;justify-content:space-between;gap:20px}.atlas-heading h1{margin:8px 0 12px}.atlas-practice{font-size:14px;color:var(--blue);font-weight:600}.atlas-intro{font-size:16px;line-height:1.6;color:var(--muted);margin:0 0 24px}.atlas-app button{font-family:inherit;font-size:14px;font-weight:600;border:1px solid var(--line);background:white;color:var(--ink);border-radius:var(--radius-sm);padding:11px 15px;min-height:44px;cursor:pointer}.atlas-app button:disabled{opacity:.45;cursor:wait}.atlas-app button:focus-visible,.atlas-app select:focus-visible,.atlas-app input:focus-visible{outline:3px solid var(--blue);outline-offset:3px}.atlas-controls{display:flex;justify-content:space-between;gap:12px;margin-bottom:14px;flex-wrap:wrap}.atlas-tabs,.atlas-views{display:flex;gap:6px}.atlas-tabs button[aria-pressed=true]{background:var(--ink);border-color:var(--ink);color:#fff}.atlas-layout{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(320px,1fr);gap:22px;align-items:start}.atlas-stage{background:var(--paper);border:1px solid var(--line);position:relative;border-radius:var(--radius-md);overflow:hidden;min-width:0}#atlas-canvas{width:100%;height:640px;max-height:76vh;min-height:380px}#atlas-canvas canvas{display:block;touch-action:none;width:100%;height:100%}.atlas-loading{position:absolute;inset:30% 30px auto;text-align:center;padding:24px;background:#ffffffed;border:1px solid var(--line);border-radius:var(--radius-sm);z-index:2;font-size:16px;line-height:1.6}.atlas-loading[hidden]{display:none}.atlas-loading p{font-size:14px;color:var(--muted)}.atlas-loading a{display:block;margin-top:18px;color:var(--blue);font-size:14px}.atlas-orientation{position:absolute;top:17px;left:20px;font-size:12px;letter-spacing:2px;color:#536779;pointer-events:none}.atlas-navigation{position:absolute;top:12px;right:12px;display:flex;gap:5px}.atlas-navigation button{font:22px system-ui;width:42px;padding:4px;min-height:42px;background:#ffffffdb}.atlas-selection{position:absolute;bottom:14px;left:18px;right:18px;text-align:center;background:#ffffffde;border:1px solid var(--line);margin:0;border-radius:var(--radius-sm);padding:10px 12px;color:var(--ink);font-size:14px;pointer-events:none}.atlas-info{padding:24px;border:1px solid var(--line);background:white;border-top:3px solid var(--teal);border-radius:var(--radius-md)}.atlas-info label[for="structure-select"]{display:block;font-size:14px;font-weight:650}.atlas-info select{width:100%;margin-top:8px;font:14px system-ui;padding:12px 9px;min-height:44px;border:1px solid #bfcedb;border-radius:5px;background:#fff;color:var(--ink)}.atlas-detail{margin-top:25px}.atlas-detail h2{font-size:28px;line-height:1.17;margin:9px 0;overflow-wrap:anywhere}.structure-nb{font-size:16px;color:var(--muted);margin:0 0 22px}.atlas-detail .eyebrow{font-size:12px}.atlas-detail dl{margin:0;padding-top:16px;border-top:1px solid var(--line)}.atlas-detail dt{font-size:14px;font-weight:700;color:var(--teal);margin:15px 0 5px}.atlas-detail dd{font-size:16px;line-height:1.6;margin:0}.atlas-detail h3{font-size:17px;margin:24px 0 12px}.exercise-links{display:flex;flex-direction:column;gap:8px}.exercise-links a{font-size:15px;font-weight:650;text-decoration:none;padding:12px 14px;background:var(--tint);border:1px solid var(--line);border-radius:var(--radius-sm);color:var(--teal)}.exercise-links a:hover{border-color:var(--teal)}.exercise-links span{display:block;font-weight:400;font-size:12px;color:var(--muted);margin-top:5px}.anatomy-reference{display:inline-block;margin-top:20px;font-size:13px;color:var(--muted)}.atlas-isolation{margin-top:24px;border-top:1px solid var(--line);padding-top:18px}.atlas-isolation label{display:flex;align-items:center;gap:9px;font-size:14px;font-weight:600}.atlas-isolation input{width:19px;height:19px;accent-color:var(--teal)}.atlas-isolation p{font-size:13px;line-height:1.6;color:var(--muted);margin-bottom:0}.bone-description{font-size:16px;line-height:1.7}.atlas-status{font-size:13px;color:var(--muted)}.atlas-sources{margin-top:24px;border-top:1px solid var(--line);padding-top:18px;font-size:14px;color:var(--muted);line-height:1.8}.atlas-sources summary{cursor:pointer;font-weight:600;color:var(--ink)}.atlas-sources a{color:var(--blue)}
@media(max-width:780px){.atlas-layout{grid-template-columns:1fr}.atlas-info{padding:22px}#atlas-canvas{height:530px;max-height:70vh;min-height:360px}.atlas-heading h1{font-size:34px}.atlas-views button{font-size:13px;padding:10px}.atlas-loading{inset:28% 20px auto}.atlas-detail h2{font-size:25px}.atlas-navigation button{width:40px}.atlas-selection{font-size:13px}}

.atlas-tabs{flex-wrap:wrap}#atlas-exercise[hidden],#atlas-explore[hidden]{display:none}#atlas-exercise h2{font-size:1.5rem;margin:16px 0 10px}#atlas-exercise p{line-height:1.5}.assembly-instructions{padding:12px;background:var(--tint);border-radius:var(--radius-sm);font-size:.9rem}.assembly-bank{display:flex;flex-wrap:wrap;gap:7px;margin-top:14px}.assembly-piece{font:inherit;font-size:.9rem;padding:9px 11px;min-height:44px;border:1px solid var(--line);border-radius:var(--radius-sm);background:#fff;color:var(--ink);cursor:pointer}.assembly-piece[aria-pressed=true]{background:var(--ink);color:white;border-color:var(--ink)}.assembly-piece:focus-visible,#atlas-exercise button:focus-visible{outline:3px solid var(--blue);outline-offset:2px}.assembly-keyboard{border:1px solid var(--line);padding:10px;border-radius:var(--radius-sm)}.assembly-keyboard summary{cursor:pointer}.assembly-keyboard label{margin:12px 0}.assembly-count{font-weight:700}.assembly-answer{display:flex;align-items:center;flex-wrap:wrap;gap:7px;padding:10px;margin:8px 0;border:1px solid var(--line);border-radius:var(--radius-sm)}.assembly-answer span{flex:1 1 100%;font-weight:600;font-size:.9rem}.assembly-answer.correct{background:var(--success-bg);border-color:var(--success);color:#165732}.assembly-answer.wrong{background:var(--error-bg);border-color:var(--error);color:#98372e}.assembly-answer small{font-size:.875rem}.assembly-actions{display:flex;flex-wrap:wrap;gap:7px;margin:14px 0}#atlas-exercise button:not(.assembly-piece){font:inherit;font-size:.9rem;min-height:44px;padding:8px 12px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--paper);color:var(--ink);cursor:pointer}#atlas-exercise button:disabled{opacity:.55;cursor:default}#atlas-exercise #assembly-check{background:var(--teal);color:#fff}.assembly-notes{font-size:.9rem;border-top:1px solid var(--line);padding-top:14px}.assembly-notes summary{cursor:pointer}#assembly-status{min-height:44px}#assembly-ready{font-size:.875rem;color:var(--muted)}

@media(min-width:781px){.atlas-stage{position:sticky;top:12px}}