:root{color-scheme:light;--canvas:#f3f4ef;--panel:#fff;--ink:#172d2c;--muted:#64716a;--line:#dfe4da;--teal:#1f4b4c;--teal-soft:#e6eeea;--amber:#d99a42;--font:'Manrope',sans-serif;--serif:'Fraunces',serif}
*{box-sizing:border-box}body{margin:0;background:var(--canvas);color:var(--ink);font-family:var(--font);font-size:13px;-webkit-font-smoothing:antialiased}html[lang=ar]{--font:'IBM Plex Sans Arabic',sans-serif;--serif:'IBM Plex Sans Arabic',sans-serif}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;color:inherit}button,a{touch-action:manipulation}button{border:1px solid var(--line);background:white;border-radius:8px;min-height:36px;padding:7px 12px}button:hover{background:var(--teal-soft)}button:active{transform:translateY(1px)}:focus-visible{outline:2px solid #388581;outline-offset:3px}a{color:inherit;text-decoration:none}button:disabled{cursor:wait;opacity:.5}[hidden]{display:none!important}.skip-link{position:fixed;top:-80px;z-index:99;background:white;padding:12px}.skip-link:focus{top:6px}.site-header{height:68px;display:flex;align-items:center;gap:40px;padding:0 34px;border-bottom:1px solid var(--line);background:#fbfcf8}.brand{font-weight:800;font-size:21px;letter-spacing:-.7px;display:flex;align-items:center;gap:9px}.brand-eye{font-size:33px;color:var(--teal);line-height:1}.site-header nav{display:flex;gap:26px;font-size:12px;font-weight:650}.site-header>button{margin-inline-start:auto;background:transparent}.app-embedded .site-header{display:none}main{padding:26px 28px 12px;max-width:1920px;margin:auto}.page-heading{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:24px}.eyebrow,.tiny-label{font-size:9px;letter-spacing:1.55px;font-weight:750;color:var(--muted)}.eyebrow{margin:0 0 9px}h1{font-family:var(--serif);font-size:clamp(25px,2.6vw,37px);font-weight:500;letter-spacing:-1px;line-height:1.15;margin:0}.intro{color:var(--muted);margin:9px 0 0;font-size:12px}.heading-actions{display:flex;gap:14px;align-items:center}.quiet{background:transparent;border:0;font-size:11px;color:var(--muted)}.practice-link{display:flex;gap:18px;align-items:center;border-radius:9px;background:var(--teal);color:white;padding:13px 17px;font-size:11px;font-weight:650}.practice-link:hover{background:#153e3d}.workspace{display:grid;grid-template-columns:232px minmax(0,1fr) 278px;gap:14px;align-items:stretch;height:calc(100dvh - 242px);min-height:630px;max-height:980px}.app-embedded .workspace{height:calc(100dvh - 174px);min-height:580px}.panel{background:var(--panel);border:1px solid var(--line);border-radius:14px;min-width:0;overflow:auto;scrollbar-width:thin;scrollbar-color:#cbd6cf transparent}.parts-panel{display:flex;flex-direction:column;padding:22px 16px 14px}.instrument-id{border-bottom:1px solid var(--line);padding-bottom:20px;margin-bottom:18px}.instrument-id h2{font-size:19px;letter-spacing:-.6px;line-height:1.35;margin:10px 0}.edition{font-size:10px;line-height:1.6;color:var(--muted);display:block}.section-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}h3{font-size:12px;margin:0;font-weight:750}.count{font-size:10px;color:var(--muted);background:#f2f5ef;border-radius:5px;padding:3px 7px}.search{display:flex;align-items:center;gap:7px;background:#f5f7f2;border:1px solid var(--line);border-radius:7px;padding:0 9px;margin-bottom:14px}.search svg{width:15px;fill:none;stroke:var(--muted);stroke-width:1.6;flex-shrink:0}.search input{width:100%;border:0;outline:0;background:transparent;min-height:34px;font-size:10px;color:var(--ink)}.part-list{display:flex;flex-direction:column;gap:3px}.part-row{display:flex;align-items:center;gap:8px;min-width:0}.part-select{border:0;flex:1;min-width:0;display:flex;align-items:center;gap:9px;text-align:start;padding:10px 7px;font-size:10px;line-height:1.5;background:transparent}.part-select[aria-pressed=true]{background:var(--teal-soft);color:var(--teal);font-weight:750}.dot{display:inline-block;flex:0 0 7px;width:7px;height:7px;border-radius:50%;background:var(--part-color,#788b99)}.part-select small{color:#827090;margin-inline-start:auto;font-size:9px}.part-visible{border:0;padding:4px;min-width:27px;min-height:32px;color:#798980;background:transparent;display:grid;place-items:center}.part-visible svg{width:14px;height:14px;fill:none;stroke:currentColor;stroke-width:1.5}.part-visible[aria-pressed=false]{opacity:.35}.part-footer{display:flex;align-items:center;gap:7px;padding-top:18px;margin-top:auto;font-size:9px;color:var(--muted);line-height:1.6}.concept-dot{background:#a28ac0}
.stage{position:relative;isolation:isolate;overflow:hidden;min-width:0;border:1px solid #c7d3cc;border-radius:14px;background:radial-gradient(ellipse at 50% 40%,#e9eeea 0%,#d6e0d9 60%,#bacbc1 100%)}.stage-canvas{position:absolute;inset:0;z-index:0}.stage canvas{display:block;width:100%;height:100%;touch-action:none}.mode-bar{position:absolute;top:16px;inset-inline:16px;display:flex;gap:3px;background:rgba(255,255,255,.8);border:1px solid #ffffffa8;box-shadow:0 3px 15px #294d3910;border-radius:10px;padding:4px;z-index:3;backdrop-filter:blur(12px)}.mode-bar button{flex:1;min-width:0;display:flex;align-items:center;justify-content:center;gap:6px;font-size:10px;border:0;min-height:37px;padding:7px 5px;background:transparent;white-space:nowrap}.mode-bar button[aria-pressed=true]{background:var(--teal);color:white;box-shadow:0 2px 4px #294d3920}.mode-index{font-size:8px;opacity:.55}.stage-caption{position:absolute;top:85px;inset-inline-start:22px;font-size:9px;color:#4b6257;display:flex;align-items:center;gap:7px;z-index:2;pointer-events:none}.status-dot{width:5px;height:5px;border-radius:50%;background:#579580}.stage-bottom{position:absolute;bottom:16px;inset-inline:12px;display:flex;flex-direction:column;align-items:center;gap:11px;z-index:3;pointer-events:none}.gesture-hint{font-size:9px;color:#536e60;margin:0}.view-tools{display:flex;align-items:center;gap:3px;background:#ffffffdc;border:1px solid #ffffffb0;border-radius:10px;padding:5px;backdrop-filter:blur(12px);pointer-events:auto;box-shadow:0 4px 15px #294d3910}.view-tools button{border:0;background:transparent;padding:6px 10px;font-size:10px;min-height:31px}.view-tools button:hover{background:var(--teal-soft)}.view-tools #zoomIn,.view-tools #zoomOut{font-size:18px;padding-inline:8px}.tool-divider{height:17px;width:1px;background:var(--line);margin:0 4px}.reset-button{color:var(--teal);font-weight:700}.loading{position:absolute;inset:0;z-index:4;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:18px;background:#dfe8e1ef;text-align:center;padding:24px}.loading strong{font-weight:550;font-size:13px}.loader-ring{width:28px;height:28px;border:2px solid #b4c7be;border-top-color:var(--teal);border-radius:50%;animation:turn 1s linear infinite}@keyframes turn{to{transform:rotate(360deg)}}.model-label{position:absolute;z-index:2;padding:7px 10px;border-radius:7px;max-width:210px;font-size:10px;font-weight:650;background:#fffffff0;box-shadow:0 3px 15px #294d391a;border:1px solid #cad9cf;pointer-events:none;transform:translate(-50%,-150%);text-align:center}.model-label:after{content:'';position:absolute;width:1px;height:12px;background:#8ca395;top:100%;left:50%}.light-legend{position:absolute;top:110px;inset-inline-start:22px;z-index:2;display:flex;flex-direction:column;gap:7px;font-size:9px;color:#456054;pointer-events:none}.light-legend>span{display:flex;align-items:center;gap:7px}.light-legend i{width:17px;height:2px;display:block}.amber-line{background:#d49335}.cyan-line{background:#389cb3}.light-legend small{max-width:180px;line-height:1.6;opacity:.8}
.controls-panel{padding:22px 19px}.inspector{padding-bottom:18px;border-bottom:1px solid var(--line)}.inspector h2{font-family:var(--serif);font-weight:500;font-size:24px;letter-spacing:-.5px;line-height:1.25;margin:10px 0}.inspector p{font-size:11px;color:var(--muted);line-height:1.8;margin:0}.selection-actions{display:flex;gap:6px;margin-top:12px}.selection-actions button{min-height:30px;padding:5px 11px;font-size:10px}.selection-actions button:first-child{background:var(--teal);color:white;border-color:var(--teal)}.selection-actions button[aria-pressed=true]{background:var(--teal-soft)}.selection-actions button:last-child{margin-inline-start:auto;font-size:18px}.control-section{padding:19px 0;border-bottom:1px solid var(--line)}.control-section h3{margin-bottom:15px}.toggle-row{display:flex;justify-content:space-between;align-items:center;margin:10px 0;font-size:10px}.toggle-row input{appearance:none;width:29px;height:17px;background:#d5dcd4;border-radius:20px;cursor:pointer;position:relative;border:0;margin:0}.toggle-row input:before{content:'';position:absolute;width:11px;height:11px;top:3px;left:3px;background:white;border-radius:50%;box-shadow:0 1px 2px #0002;transition:transform 150ms ease-out}.toggle-row input:checked{background:var(--teal)}.toggle-row input:checked:before{transform:translateX(12px)}.range-heading{display:flex;justify-content:space-between;align-items:center;gap:8px;font-size:10px;margin-top:17px;margin-bottom:6px}.range-heading output{font-size:10px;color:var(--teal);font-variant-numeric:tabular-nums;direction:ltr;font-weight:700}input[type=range]{width:100%;height:21px;margin:0;accent-color:var(--teal);cursor:pointer}.range-ends{display:flex;justify-content:space-between;font-size:8px;color:var(--muted)}.angle-stops{display:flex;gap:4px;margin-top:4px}.angle-stops button{flex:1;font-size:9px;min-height:26px;padding:3px;background:#f7f9f5}.micro-note{font-size:9px;line-height:1.7;color:var(--muted);margin:8px 0 0}.control-section select{width:100%;padding:9px 10px;border:1px solid var(--line);border-radius:7px;background:#f7f9f5;font-size:10px;color:var(--ink)}.lesson-card{margin-top:20px;background:#eef3eb;border:1px solid #e0e8da;border-radius:10px;padding:15px}.lesson-top{display:flex;align-items:center;justify-content:space-between;gap:5px}.lesson-top .tiny-label{font-size:8px;letter-spacing:.8px}.lesson-top>span:last-child{font-size:9px;color:var(--muted);white-space:nowrap}.lesson-card h3{font-size:13px;line-height:1.5;margin-top:12px}.lesson-card p{font-size:10px;line-height:1.75;color:var(--muted);margin:8px 0 13px}.lesson-card button{display:flex;align-items:center;justify-content:space-between;width:100%;background:white;font-size:10px;border-color:#d5e0ce;font-weight:650}.page-footer{display:flex;justify-content:space-between;font-size:9px;color:var(--muted);padding:13px 1px;gap:15px}.page-footer>span:last-child{font-size:8px;letter-spacing:1px}.mobile-panel-switch{display:none}dialog{width:min(560px,calc(100% - 32px));padding:27px;border:1px solid var(--line);border-radius:16px;color:var(--ink);background:#fcfdf9;box-shadow:0 20px 90px #142c3b40}dialog::backdrop{background:#152d2c66;backdrop-filter:blur(4px)}.dialog-heading{display:flex;align-items:center;justify-content:space-between;gap:20px}.dialog-heading h2{font-family:var(--serif);font-weight:500;font-size:25px;margin:0}.dialog-heading button{font-size:24px;border:0;background:transparent}dialog>p{font-size:12px;line-height:1.9;color:var(--muted)}.source-item{padding:14px 0;border-top:1px solid var(--line)}.source-item a{font-weight:650;color:var(--teal);font-size:12px;text-decoration:underline;text-underline-offset:3px}.source-item p{font-size:11px;color:var(--muted);line-height:1.7;margin-bottom:0}
.streak-inset{position:absolute;inset-inline-end:20px;top:84px;z-index:2;width:120px;text-align:center;pointer-events:none}.streak-screen{height:96px;border-radius:9px;background:#203b3c;display:grid;place-items:center;border:1px solid #19312f;box-shadow:0 3px 10px #213c3215}.streak-screen i{display:block;width:3px;height:64px;border-radius:50%;background:#ffe4b4;box-shadow:0 0 6px #ffcc7788}.streak-inset>span{display:block;font-size:9px;margin-top:6px;color:#4e675b;line-height:1.5}.part-select{font-size:11px}.mode-bar button{font-size:11px}.range-heading,.toggle-row{font-size:11px}.inspector p{font-size:12px}.view-tools button{font-size:11px}
@media(min-width:1600px){.workspace{grid-template-columns:260px minmax(0,1fr) 310px}.part-select{font-size:12px}.controls-panel{padding:24px}.range-heading,.toggle-row{font-size:12px}.inspector p{font-size:12px}}
@media(max-width:1150px){main{padding:20px 18px 8px}.workspace{grid-template-columns:196px minmax(0,1fr) 238px;gap:10px}.parts-panel{padding:18px 12px}.controls-panel{padding:18px 14px}.mode-index{display:none}.mode-bar{inset-inline:10px;top:12px}.view-tools button{padding-inline:7px;font-size:9px}.intro{font-size:11px}.heading-actions{gap:3px}.quiet{font-size:10px}.page-heading{gap:12px}}
@media(max-width:900px){.workspace,.app-embedded .workspace{height:auto;max-height:none;min-height:0;display:grid;grid-template-columns:1fr;gap:12px}.stage{height:60dvh;min-height:420px;max-height:720px;grid-row:1}.mobile-panel-switch{display:flex;background:#e4ebe1;border-radius:9px;padding:4px;gap:4px;grid-row:2}.mobile-panel-switch button{flex:1;border:0;background:transparent;font-size:12px}.mobile-panel-switch button[aria-pressed=true]{background:white;box-shadow:0 1px 4px #172d2c12}.workspace[data-mobile-panel=parts] .controls-panel,.workspace[data-mobile-panel=controls] .parts-panel{display:none}.panel{max-height:none;overflow:visible}.parts-panel{padding:20px}.part-list{display:grid;grid-template-columns:1fr 1fr}.part-select{font-size:12px;min-height:44px}.controls-panel{padding:22px;display:grid;grid-template-columns:1fr 1fr;gap:20px}.inspector{grid-column:1/-1}.control-section{padding-top:0}.lesson-card{margin-top:0}.range-heading,.toggle-row{font-size:12px}.inspector p{font-size:12px}.mode-bar{inset-inline:16px;top:16px}.mode-bar button{font-size:12px}.view-tools button{font-size:11px;min-height:38px}.stage-caption{font-size:11px}.gesture-hint{font-size:10px}.intro{font-size:12px}.page-heading{align-items:flex-start}.heading-actions{flex-direction:column;align-items:flex-end;gap:4px}.heading-actions .quiet{order:2}.site-header{padding:0 20px}.light-legend{font-size:11px}.tiny-label{font-size:10px}}
@media(max-width:540px){main{padding:17px 12px 6px}.site-header{height:56px;padding:0 15px;gap:24px}.brand{font-size:19px}.site-header nav{font-size:11px;gap:14px}.site-header>button{font-size:11px;padding:5px 9px}.page-heading{display:block;margin-bottom:17px}.eyebrow{font-size:8px}h1{font-size:29px}.intro{font-size:11px}.heading-actions{margin-top:15px;flex-direction:row;justify-content:space-between;align-items:center;gap:8px}.heading-actions .quiet{order:0;padding-inline:0}.practice-link{font-size:10px;padding:10px 12px;gap:8px}.stage{height:57dvh;min-height:400px}.mode-bar{inset-inline:9px;top:10px}.mode-bar button{font-size:10px;padding:7px 3px}.stage-caption{top:72px;inset-inline-start:16px;font-size:9px}.light-legend{top:97px;inset-inline-start:16px;font-size:9px}.light-legend small{max-width:140px}.view-tools{gap:0;padding:3px}.view-tools button{font-size:9px;padding-inline:7px;min-height:38px}.tool-divider{margin-inline:2px}.stage-bottom{inset-inline:8px;bottom:12px}.gesture-hint{font-size:8px}.part-list{grid-template-columns:1fr}.part-select{font-size:12px}.part-visible{min-height:44px;min-width:40px}.controls-panel{display:block}.control-section{padding:20px 0}.lesson-card{margin-top:20px}.inspector h2{font-size:27px}.micro-note{font-size:11px}.angle-stops button{min-height:36px;font-size:11px}.toggle-row{min-height:28px}.range-heading{margin-top:22px}.control-section select{font-size:12px;min-height:44px}.lesson-card p{font-size:12px}.lesson-card button{font-size:12px;min-height:42px}.page-footer{font-size:8px;line-height:1.7}.page-footer>span:last-child{display:none}dialog{padding:20px}.model-label{font-size:11px}.search input{font-size:12px;min-height:42px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}.loader-ring{animation:none}}
@media(max-width:540px){.streak-inset{width:87px;inset-inline-end:14px;top:82px}.streak-screen{height:73px}.streak-screen i{height:51px}.streak-inset>span{font-size:8px}.mode-bar button{font-size:10px}}
.part-tools{border-bottom:1px solid var(--line);padding:14px 0 18px}.part-tools summary{display:flex;align-items:center;justify-content:space-between;font-size:11px;font-weight:700;cursor:pointer;list-style:none;min-height:32px}.part-tools summary::-webkit-details-marker{display:none}.part-tools[open] summary{margin-bottom:12px}.part-color-row{display:flex;justify-content:space-between;align-items:center;font-size:11px}.part-color-row input{width:38px;height:29px;padding:2px;border:1px solid var(--line);border-radius:6px;background:white;cursor:pointer}.restore-part,.restore-assembly{width:100%;margin-top:12px;font-size:10px;background:#f6f8f3}.light-styles{display:flex;gap:4px;margin-top:10px}.light-styles button{flex:1;padding:5px 3px;font-size:10px;min-height:32px;background:#f7f9f5}.light-styles button[aria-pressed=true]{background:var(--teal);color:white;border-color:var(--teal)}.alignment-note{position:absolute;top:113px;inset-inline-start:20px;max-width:220px;color:#805c26;background:#fff5dfeb;padding:8px 11px;font-size:10px;line-height:1.6;border-radius:7px;pointer-events:none}.streak-screen i{width:4px;background:linear-gradient(90deg,#ffe4b422,#fff0cddd 38%,#fff9e4 50%,#fff0cddd 62%,#ffe4b422);filter:blur(.15px);box-shadow:0 0 5px #ffcc7777,0 0 12px #ffcc7733}
@media(max-width:900px){.part-tools{grid-column:1/-1}.part-tools summary,.part-color-row{font-size:12px}.part-tools .micro-note{font-size:11px}.light-styles button,.restore-part,.restore-assembly{min-height:40px;font-size:11px}}
.interaction-tools{display:flex;gap:3px;background:#ffffffcf;border:1px solid #fff9;border-radius:8px;padding:3px;pointer-events:auto;backdrop-filter:blur(10px)}.interaction-tools button{font-size:10px;min-height:29px;padding:5px 11px;border:0;background:transparent}.interaction-tools button[aria-pressed=true]{background:#dce9df;color:#163e35;font-weight:750}.stage[data-dragging=hold],.stage[data-dragging=sleeve]{box-shadow:inset 0 0 0 2px #78a99a66}.stage[data-dragging=part]{box-shadow:inset 0 0 0 2px #d99a4266}
@media(max-width:540px){.interaction-tools button{font-size:9px;padding:5px 9px;min-height:32px}.stage-bottom{gap:7px}.stage{min-height:440px}}
#beamAim{display:block;color:#76501e;font-size:9px;line-height:1.5;margin-top:3px}#beamAim:empty{display:none}
.patient-hud{position:absolute;z-index:3;top:110px;inset-inline-start:18px;max-width:calc(100% - 36px)}.patient-view-switch{display:flex;gap:4px;padding:4px;border-radius:10px;background:#ffffffed}.patient-view-switch button{font-size:10px;border:0}.patient-view-switch button[aria-pressed=true]{background:var(--teal);color:white}.patient-hud p{font-size:10px;background:#fff7e8e8;color:#705525;border-radius:6px;padding:7px 10px;max-width:245px}.patient-hud p[data-aligned=true]{background:#edf7eeed;color:#245f45}.patient-controls h2{font-family:var(--serif);font-size:24px;font-weight:500;margin:12px 0}.patient-controls .toggle-row{margin-top:16px}.patient-case{margin-top:18px;border-top:1px solid var(--line);padding-top:14px}.patient-case summary{cursor:pointer;font-weight:700;font-size:12px;margin-bottom:14px}.patient-case>label{display:block;font-size:11px;margin-bottom:8px}.examiner-mask{position:absolute;inset:0;z-index:1;background:radial-gradient(circle at center,transparent 0,transparent 33%,#19302b55 49%,#172b28e8 72%);pointer-events:none}.patient-inset{position:absolute;inset-inline-end:16px;bottom:65px;width:135px;height:150px;border:1px solid #ffffffa8;border-radius:10px;z-index:2;pointer-events:none;overflow:hidden}.patient-inset span{position:absolute;bottom:4px;inset-inline:0;text-align:center;font-size:9px;color:var(--ink);background:#f3f6ecdd;padding:4px}.stage[data-patient=true] .stage-bottom{bottom:18px}.stage[data-patient=true] .gesture-hint{padding:7px 10px;background:#ffffffe0;border-radius:7px}.parts-panel[inert]{opacity:.48}.patient-controls{padding-top:0}
@media(max-width:540px){.patient-hud{top:95px;inset-inline-start:12px}.patient-view-switch button{font-size:10px;padding:6px 9px}.patient-hud p{font-size:9px;max-width:230px}.patient-inset{width:90px;height:108px;bottom:50px;inset-inline-end:10px}.mode-bar button{font-size:9px}.patient-controls{padding-top:0}}
.patient-guide{display:none}.workspace[data-session=patient] .patient-guide{display:block}.workspace[data-session=patient] .parts-panel>:not(.patient-guide){display:none}.patient-guide h2{font-family:var(--serif);font-size:25px;font-weight:500;line-height:1.35;margin:18px 0 28px}.patient-guide ol{padding-inline-start:21px}.patient-guide li{padding-inline-start:6px;margin-bottom:28px;color:var(--teal);font-size:12px}.patient-guide li p{font-size:11px;line-height:1.8;color:var(--muted);margin-top:9px}.patient-guide .micro-note{border-top:1px solid var(--line);padding-top:20px}.examiner-mask{background:radial-gradient(circle at center,transparent 0,transparent 33%,#19302b33 49%,#172b2890 72%)}
.workspace[data-session=patient] .control-section:has(#explode),.workspace[data-session=patient] .lesson-card{display:none}