:root{--navy:#172b46;--deep:#0c192b;--ink:#1e293b;--muted:#526174;--paper:#f4f6f8;--line:#dce4ea;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none;color-scheme:light}
*{box-sizing:border-box}body{margin:0;min-width:320px;font-size:16px;line-height:1.55}button{font:inherit;cursor:pointer}a{color:inherit;text-underline-offset:4px}button:disabled{cursor:wait}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #6c8cb0;outline-offset:5px}::selection{background:#d5e3f0;color:#172b46}[hidden]{display:none!important}.skip-link{position:absolute;top:-100px;left:16px;padding:9px 14px;background:var(--navy);color:white;z-index:20}.skip-link:focus{top:12px}.shell{width:min(1120px,calc(100% - 40px));margin-inline:auto}
.site-header{border-bottom:1px solid var(--line)}.nav{min-height:76px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:inline-flex;align-items:center;gap:11px;font-size:1.04rem;font-weight:750;letter-spacing:-.025em;text-decoration:none;white-space:nowrap}.brand-mark{display:grid;place-items:center;flex:0 0 40px;width:40px;height:40px;border-radius:10px;background:var(--navy);color:#f4f6f8;font-size:.72rem;font-weight:800;letter-spacing:-.03em}.nav-links{display:flex;align-items:center;gap:3px}.nav-links a{padding:9px 12px;border-radius:8px;color:var(--muted);font-size:.9rem;font-weight:650;text-decoration:none;white-space:nowrap}.nav-links a:hover,.nav-links a[aria-current=page]{background:#e5edf2;color:var(--navy)}
.workspace{width:min(1440px,calc(100% - 40px));margin:0 auto;padding:24px 0 40px}.intro{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:18px}.intro>div{min-width:0}.intro h1{margin:0 0 7px;font-size:clamp(1.8rem,3vw,2.35rem);font-weight:750;letter-spacing:-.03em;line-height:1.2}.intro p{margin:0;color:var(--muted);font-size:1rem}.camera-stage{position:relative;display:grid;place-items:center;width:100%;aspect-ratio:16/9;overflow:hidden;border-radius:12px;background:var(--deep)}.camera-stage>video,.camera-stage>canvas{position:absolute;inset:0;width:100%;height:100%;transform:scaleX(-1)}.camera-stage video{object-fit:cover}.camera-stage canvas{pointer-events:none}.camera-placeholder{display:grid;justify-items:center;gap:16px;padding:24px;text-align:center}.camera-placeholder p{margin:0;color:#bdcada;font-size:.94rem}.start-button{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:50px;padding:13px 22px;border:0;border-radius:8px;background:#f4f6f8;color:var(--navy);font-weight:700;transition:background .15s}.start-button:hover{background:#dae5ef}.start-button:disabled{color:#5b6b7e;background:#dce5ed}.start-button:focus-visible{outline-color:#b4c9df}.live-label{position:absolute;top:18px;left:18px;display:flex;align-items:center;gap:7px;padding:5px 9px;border-radius:5px;background:rgba(12,25,43,.85);color:#f4f6f8;font-size:.78rem}.live-label>span{width:6px;height:6px;border-radius:50%;background:#c7ded4}.camera-bar{display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:62px;padding-block:10px}.camera-bar p{margin:0;color:var(--muted);font-size:.88rem}.camera-bar p[data-error=true]{color:#84372d}.stop-button{flex:0 0 auto;display:inline-flex;align-items:center;gap:9px;min-height:48px;padding:11px 17px;border:1px solid var(--navy);border-radius:8px;background:var(--navy);color:#f6f4ef;font-size:.9rem;font-weight:650}.stop-button:hover{background:#294361}.stop-button:focus-visible{outline-color:var(--focus)}.method{border-top:1px solid var(--line);padding-top:16px;color:var(--muted);font-size:.86rem}.method summary{width:fit-content;cursor:pointer;color:var(--navy);padding:4px 0}.method>div{max-width:73ch;margin-top:14px;line-height:1.65}.method p{margin:0 0 12px}.technical-credit{font-size:.8rem}.site-footer{border-top:1px solid var(--line)}.footer-inner{display:flex;justify-content:space-between;align-items:center;gap:16px;min-height:76px;color:var(--muted);font-size:.85rem}.footer-inner a{text-decoration:none}.footer-inner a:hover{text-decoration:underline}
@media(max-width:680px){.shell,.workspace{width:calc(100% - 32px)}.nav{flex-direction:column;align-items:flex-start;gap:10px;padding-block:13px}.nav-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:2px;width:100%}.nav-links a{padding:7px 8px;font-size:.82rem;text-align:center}.workspace{padding-top:27px;padding-bottom:30px}.intro{margin-bottom:20px}.intro p{max-width:29ch}.camera-stage{aspect-ratio:4/5}.camera-bar{gap:12px;min-height:72px}.camera-bar p{font-size:.82rem}.live-label{left:12px;top:12px}.stop-button{min-height:44px;padding:9px 12px;font-size:.82rem}.footer-inner{align-items:flex-start;flex-direction:column;gap:7px;padding-block:21px;min-height:0}.camera-placeholder p{max-width:23ch;font-size:.87rem}}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}
/* The live inset uses the same tracked hands as the main camera. */
.tracking-view{--panel-width:264px;--panel-gap:clamp(12px,1.5vw,18px);position:relative;display:grid}
.tracking-view>.camera-stage{grid-area:1/1;min-height:460px}
.tracking-view .camera-placeholder{justify-self:stretch;margin:0}
.maneuver-panel{position:relative;grid-area:1/1;justify-self:end;align-self:start;margin:var(--panel-gap);width:var(--panel-width);overflow:hidden;border-radius:12px;background:#f6f4ef;box-shadow:0 8px 28px rgba(23,43,70,.16);color:var(--navy)}
.maneuver-panel:not([hidden]){animation:panel-reveal 200ms cubic-bezier(.16,1,.3,1) both}
.maneuver-header{display:flex;justify-content:space-between;align-items:center;gap:8px;height:46px;padding:0 12px}
.maneuver-header h2{margin:0;font-size:13px;font-weight:600;line-height:1.3;letter-spacing:-.01em;white-space:nowrap}
.maneuver-header .stop-button{gap:5px;min-height:28px;margin:0;padding:5px 7px;border:1px solid #bdc6c9;border-radius:5px;background:transparent;color:var(--navy);font-size:10px;font-weight:400;line-height:1.5;white-space:nowrap}
.maneuver-header .stop-button svg{width:10px;height:10px}
.hand-inset{position:relative;height:140px;background-color:#eef0ec;background-image:linear-gradient(#dfe4df 1px,transparent 1px),linear-gradient(90deg,#dfe4df 1px,transparent 1px);background-size:22px 22px;background-position:center}
.hand-inset canvas{display:block;width:100%;height:100%;pointer-events:none}
.hand-inset #inset-empty{position:absolute;inset:12px;display:grid;place-content:center;margin:0;color:var(--muted);font-size:11px;text-align:center}
.gesture-feedback{display:grid;grid-template-columns:14px minmax(0,1fr) 14px;align-items:center;gap:7px;min-height:56px;padding:9px 14px;background:#e4e9e5;color:var(--navy);transition:background-color 150ms ease-out,color 150ms ease-out}
.gesture-feedback p,.gesture-space{grid-area:1/2;margin:0;min-width:0;font-size:12px;font-weight:600;line-height:1.5;text-align:center}
.gesture-space{display:grid;visibility:hidden;pointer-events:none;user-select:none}
.gesture-space>span{grid-area:1/1;min-width:0}
.gesture-check{grid-area:1/1;visibility:hidden}
.gesture-feedback[data-state=recognized]{background:#eee1d3;color:#6b452b}
.gesture-feedback[data-state=recognized] .gesture-check{visibility:visible}
.maneuver-anatomy{padding:10px 12px 12px}
.privacy-method{margin-top:12px;padding-top:10px}
.method summary{min-height:44px;display:list-item;align-content:center}
.method>div{margin-top:8px}
.anatomy summary{font-weight:600}
.camera-bar:has(#camera-status:empty){min-height:24px;padding:0}
.tracking-check{margin-bottom:20px}
.tracking-check button:disabled{cursor:default;opacity:.55}
.tracking-check [data-sample-status]{margin-top:12px}
@keyframes panel-reveal{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}
@media(hover:hover){.maneuver-header .stop-button:hover{background:#e4e9e5}}
/* Keep the camera and its feedback together on phones. The panel remains in
   the same grid cell, so longer text can grow the stage rather than escape it. */
@media(max-width:720px), (max-width:1000px) and (max-height:500px){
  .tracking-view{--panel-width:184px;--panel-gap:8px}
  .tracking-view>.camera-stage{aspect-ratio:4/3;min-height:460px}
  .maneuver-panel{width:var(--panel-width);border-radius:10px}
  .maneuver-header{height:44px;padding:0 8px;justify-content:flex-end}
  .maneuver-header h2{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
  .maneuver-header .stop-button{min-height:44px;padding:8px 10px;font-size:12px;gap:7px}
  .maneuver-header .stop-button svg{width:12px;height:12px}
  .hand-inset{height:76px}
  .gesture-feedback{position:relative;grid-template-columns:minmax(0,1fr);gap:0;padding:6px 7px;min-height:44px}
  .gesture-feedback p,.gesture-space{grid-area:1/1;font-size:11px;line-height:1.5}
  .gesture-feedback[data-state=recognized] p{padding-inline:12px}
  .gesture-check{position:absolute;left:7px;top:50%;transform:translateY(-50%);width:12px;height:12px}
  .maneuver-anatomy{padding:4px 8px 2px}
  .live-label{top:12px;left:12px}
}
@media(max-width:540px){
  .intro{align-items:flex-start;gap:12px}
  .intro h1{font-size:1.95rem}
  .intro p{max-width:29ch;font-size:.88rem}
  .tracking-view{--panel-width:clamp(168px,47vw,184px)}
  .tracking-view>.camera-stage{aspect-ratio:3/5;min-height:500px}
}
@media(pointer:coarse){.maneuver-header{height:54px}.maneuver-header .stop-button{min-height:44px}}
@media(max-width:1000px) and (max-height:500px) and (orientation:landscape){
  .tracking-view>.camera-stage{aspect-ratio:16/9;min-height:460px}
}
@media(max-width:1000px) and (max-height:500px) and (pointer:coarse), (max-width:720px) and (pointer:coarse){.maneuver-header{height:44px}}
@media(prefers-reduced-motion:reduce){.maneuver-panel:not([hidden]){animation:none}}

.tracking-check label{display:block;margin-bottom:6px;color:var(--navy)}
.tracking-check select{display:block;max-width:100%;min-height:42px;margin-bottom:12px;padding:8px 12px;border:1px solid var(--line);border-radius:6px;background:var(--paper);color:var(--navy);font:inherit}
.tracking-check select:focus-visible{outline:3px solid var(--focus);outline-offset:3px}