/* "How it works" (Oct 30-31): explains contactless vital signs from any camera, between the hero and "One sensing
   engine". Four options to compare; the picker at the top right switches between them (?how=1..4).
   1 is the participant video, compact; 2-4 do not show her. Prefix cvx- (checked against every web/*.css).
   Edges follow the hero's, heading type follows #two-engines. */
.cvx{--cvx-red:#df3449;--cvx-chip:#c41230;--cvx-br:#373a40;--cvx-br2:#8a8e9c;--cvx-mute:#7d8187;--cvx-panel:#f1f1f3;padding:112px 24px 0;background:#fff;color:#0a0a0a;font-family:var(--font)}
.cvx-in{position:relative;box-sizing:border-box;max-width:calc(1424px + 2 * (max(88px,50vw - 712px) - 24px));margin:0 auto;padding-inline:calc(max(88px,50vw - 712px) - 24px)}
.cvx-v[hidden]{display:none!important}
.cvx canvas{display:block;width:100%;height:100%}

/* ---------- picker (review only) ---------- */
.cvx-pick{position:absolute;top:0;right:calc(max(88px,50vw - 712px) - 24px);z-index:3;display:flex;align-items:center;gap:4px;padding:4px 4px 4px 14px;border-radius:99px;background:#f3f3f5;font:500 13px/1 var(--font);color:#55585e}
.cvx-pick>span{margin-right:6px}
.cvx-pick button{display:grid;place-items:center;width:30px;height:30px;padding:0;border:0;border-radius:50%;background:transparent;color:#111;font:500 13px/1 var(--font);cursor:pointer;transition:background .15s,color .15s}
.cvx-pick button:hover{background:#e6e6ea}
.cvx-pick button[aria-pressed="true"]{background:#111;color:#fff}
.cvx-pick button:focus-visible{outline:2px solid var(--cvx-chip);outline-offset:2px}
.cvx-pick em{min-width:9.5em;padding:0 12px 0 8px;font-style:normal;color:#111}

/* ---------- heading (same as #two-engines) ---------- */
.cvx-head{display:grid;grid-template-columns:max-content;justify-content:start;margin:0 0 64px}
.cvx-label{justify-self:start;margin:0 0 20px;padding:7px 14px;border-radius:99px;background:#f3f3f5;color:#111;font:500 14px/1.2 var(--font)}
.cvx-head h2{margin:0;font-size:clamp(26px,2.7vw,42px);font-weight:600;line-height:1.2;letter-spacing:-.6px;color:#0a0a0a}
.cvx-head p:not(.cvx-label){margin:14px 0 0;contain:inline-size;font-size:clamp(16px,1.4vw,21px);line-height:1.45;letter-spacing:-.25px;color:var(--cvx-mute);text-wrap:pretty}
.cvx-chip{position:absolute;left:16px;bottom:16px;z-index:2;padding:6px 11px;border-radius:99px;background:rgba(255,255,255,.92);color:#111;font:500 12.5px/1 var(--font);box-shadow:0 4px 14px -6px rgba(0,0,0,.25)}

/* =========================================================================================
   1 · The camera's eye, compact: copy on the left, a square viewer on the right (50/50 like #measure)
   ========================================================================================= */
.cvx-split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:80px;align-items:center}
.cvx-split .cvx-head{display:block;margin:0 0 40px}
.cvx-split .cvx-head p:not(.cvx-label){contain:none;max-width:30em}
.cvx-split .cvx-label{display:inline-block}
.cvx-fig{justify-self:end;width:100%;max-width:540px}
.cvx-stage{position:relative;aspect-ratio:1;overflow:hidden;border-radius:18px;background:#1a1714;touch-action:pan-y;user-select:none;-webkit-user-select:none}
.cvx-stage>canvas{position:absolute;inset:0}
.cvx-tag{position:absolute;top:16px;z-index:2;padding:7px 12px;border-radius:99px;font:500 12.5px/1 var(--font);pointer-events:none}
.cvx-tag.l{left:16px;background:rgba(255,255,255,.92);color:#111}
.cvx-tag.r{right:16px;background:rgba(14,14,16,.7);color:#fff;box-shadow:inset 0 0 0 1px rgba(255,255,255,.14)}
.cvx-bar{position:absolute;top:0;bottom:0;left:var(--x,50%);z-index:2;width:0}
.cvx-bar::before{content:"";position:absolute;top:0;bottom:0;left:-1px;width:2px;background:#fff;box-shadow:0 0 12px rgba(0,0,0,.25)}
.cvx-handle{position:absolute;top:50%;left:0;display:grid;place-items:center;width:44px;height:44px;margin:-22px 0 0 -22px;padding:0;border:0;border-radius:50%;background:#fff;color:#111;box-shadow:0 6px 20px -6px rgba(0,0,0,.45);cursor:ew-resize}
.cvx-handle svg{width:21px;height:21px}
.cvx-handle:focus-visible{outline:2px solid var(--cvx-chip);outline-offset:3px}
.cvx-note{margin:12px 0 0;font-size:13px;line-height:1.4;color:#9a9da3}
.cvx-facts{display:grid;gap:10px;margin:0;padding:0;list-style:none}
.cvx-dr summary{display:grid;grid-template-columns:44px minmax(0,1fr) 24px;column-gap:16px;align-items:center;padding:6px 0;list-style:none;cursor:pointer}.cvx-dr summary::-webkit-details-marker{display:none}.cvx-dr summary:focus-visible{outline:2px solid var(--cvx-chip);outline-offset:4px;border-radius:12px}.cvx-pm{width:18px;height:18px;justify-self:end;fill:none;stroke:#7d7d80;stroke-width:1.8;stroke-linecap:round;transition:transform .25s ease}.cvx-dr[open] .cvx-pm{transform:rotate(45deg)}.cvx-dr p{margin:4px 0 8px 60px;font-size:16px;line-height:1.5;letter-spacing:-.02em;color:#7d7d80;text-wrap:pretty}
.cvx-facts b{display:block;font-size:18px;line-height:1.25;font-weight:500;letter-spacing:-.02em}.cvx-ic{display:grid;place-items:center;width:44px;height:44px;border-radius:12px;background:#f3f3f5;color:#0a0a0a;font-style:normal}.cvx-ic svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}.cvx-more{display:inline-flex;margin-top:32px}
.cvx-facts span{display:block;margin-top:6px;font-size:17px;line-height:1.45;letter-spacing:-.02em;color:#7d7d80}

/* =========================================================================================
   2 · Turn it up: camera pixels of skin, the colour change amplified by a slider
   ========================================================================================= */
.cvx-amp{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:20px}
.cvx-swatch{position:relative;aspect-ratio:1;overflow:hidden;border-radius:18px;background:#d1a17a}
.cvx-swatch>canvas{position:absolute;inset:0}
.cvx-panel{display:flex;flex-direction:column;gap:28px;box-sizing:border-box;padding:clamp(24px,3vw,44px);border-radius:18px;background:var(--cvx-panel)}
.cvx-ph{display:flex;justify-content:space-between;align-items:flex-end;gap:16px}
.cvx-ph span{font:500 15px/1.2 var(--font);color:var(--cvx-mute)}
.cvx-ph strong{font:500 clamp(44px,4.4vw,72px)/.9 var(--font);letter-spacing:-.05em;font-variant-numeric:tabular-nums;transition:color .4s}
.cvx-ph strong em{margin-left:6px;font-style:normal;font-size:16px;letter-spacing:0;color:var(--cvx-mute)}
.cvx-ph strong.off{color:#c4c6cc}
.cvx-plot{position:relative;flex:1;min-height:150px;border-radius:12px;background:#fff}
.cvx-plot>canvas{position:absolute;inset:0}
.cvx-range{display:grid;grid-template-columns:auto minmax(0,1fr) 4.2em;align-items:center;gap:16px;font:500 15px/1 var(--font)}
.cvx-range output{text-align:right;font-variant-numeric:tabular-nums}
.cvx-range input{width:100%;height:28px;margin:0;background:transparent;-webkit-appearance:none;appearance:none;cursor:pointer}
.cvx-range input::-webkit-slider-runnable-track{height:4px;border-radius:4px;background:linear-gradient(90deg,#111 var(--v,0%),#d6d6db 0)}
.cvx-range input::-moz-range-track{height:4px;border-radius:4px;background:#d6d6db}
.cvx-range input::-moz-range-progress{height:4px;border-radius:4px;background:#111}
.cvx-range input::-webkit-slider-thumb{-webkit-appearance:none;width:24px;height:24px;margin-top:-10px;border-radius:50%;background:#fff;box-shadow:0 0 0 1px rgba(0,0,0,.08),0 4px 12px -3px rgba(0,0,0,.35)}
.cvx-range input::-moz-range-thumb{width:24px;height:24px;border:0;border-radius:50%;background:#fff;box-shadow:0 0 0 1px rgba(0,0,0,.08),0 4px 12px -3px rgba(0,0,0,.35)}
.cvx-range input:focus-visible{outline:2px solid var(--cvx-chip);outline-offset:4px;border-radius:4px}
.cvx-tones{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font:500 15px/1 var(--font)}
.cvx-tones>span{margin-right:8px}
.cvx-tones button{width:34px;height:34px;padding:0;border:0;border-radius:50%;background:var(--c);color:var(--t,#111);font:500 11px/1 var(--font);cursor:pointer;box-shadow:inset 0 0 0 1px rgba(0,0,0,.06);transition:box-shadow .2s}
.cvx-tones button[aria-pressed="true"]{box-shadow:0 0 0 2px #fff,0 0 0 4px #111}
.cvx-tones button:focus-visible{outline:2px solid var(--cvx-chip);outline-offset:4px}
.cvx-small{margin:-8px 0 0;font-size:14px;line-height:1.45;color:#9a9da3}

/* =========================================================================================
   3 · Where it looks: a faceless figure in points, wired to two signal cards
   ========================================================================================= */
.cvx-map{position:relative;aspect-ratio:2.25/1;overflow:hidden;border-radius:18px;background:var(--cvx-panel)}
.cvx-map>canvas{position:absolute;inset:0}
.cvx-card{position:absolute;right:5%;z-index:2;box-sizing:border-box;width:min(34%,400px);padding:20px 22px 16px;border-radius:16px;background:#fff;box-shadow:0 1px 2px rgba(0,0,0,.04),0 18px 40px -24px rgba(20,24,40,.3)}
.cvx-card-p{top:12%}
.cvx-card-b{bottom:12%}
.cvx-card p{display:flex;flex-wrap:wrap;align-items:center;gap:0 8px;margin:0;font:500 16px/1.3 var(--font)}
.cvx-card p i{width:8px;height:8px;border-radius:50%;background:var(--cvx-red)}
.cvx-card-b p i{background:var(--cvx-br)}
.cvx-card p small{flex-basis:100%;margin-top:3px;font-size:14px;font-weight:400;color:var(--cvx-mute)}
.cvx-card strong{display:block;margin-top:14px;font:500 clamp(34px,3vw,46px)/1 var(--font);letter-spacing:-.045em;font-variant-numeric:tabular-nums}
.cvx-card strong em{margin-left:5px;font-style:normal;font-size:15px;letter-spacing:0;color:var(--cvx-mute)}
.cvx-card canvas{height:40px;margin-top:10px}

/* =========================================================================================
   4 · Light and movement: two diagrams
   ========================================================================================= */
.cvx-duo{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:20px}
.cvx-dart{position:relative;aspect-ratio:4/3;overflow:hidden;border-radius:18px;background:var(--cvx-panel)}
.cvx-dart>canvas{position:absolute;inset:0}
.cvx-dc h3{display:flex;align-items:center;gap:10px;margin:28px 0 10px;font-size:28px;line-height:1.15;font-weight:500;letter-spacing:-.02em}
.cvx-dc h3 i{width:9px;height:9px;border-radius:50%;background:var(--cvx-red)}
.cvx-dc h3 i.b{background:var(--cvx-br)}
.cvx-dc p{max-width:34em;margin:0;font-size:18px;line-height:1.5;letter-spacing:-.03em;color:#7d7d80;text-wrap:pretty}

/* ---------- tablet ---------- */
@media(max-width:1100px){
 .cvx-split{gap:48px}
 .cvx-facts b{font-size:18px}.cvx-facts span{font-size:15px}
 .cvx-map{aspect-ratio:1.7/1}
 .cvx-card{width:40%;padding:16px 18px 12px}
 .cvx-dc h3{font-size:24px}.cvx-dc p{font-size:16px}
}
@media(max-width:999px){.cvx-pick em{display:none}}
@media(max-width:900px){
 .cvx-split{grid-template-columns:minmax(0,1fr);gap:40px}
 .cvx-fig{justify-self:start}
 .cvx-amp{grid-template-columns:minmax(0,1fr)}
 .cvx-swatch{aspect-ratio:16/10}
}

/* ---------- phone ---------- */
@media(max-width:760px){
 .cvx{padding:72px 6.25vw 0}
 .cvx-in{padding-inline:0}
 .cvx-pick{position:static;width:max-content;margin:0 0 28px}
 .cvx-head{display:block;margin-bottom:40px}
 .cvx-head h2{font-size:32px}
 .cvx-head p:not(.cvx-label){font-size:18px;line-height:28px;contain:none}
 .cvx-label{display:inline-block;font-size:13px;margin-bottom:18px}
 .cvx-split .cvx-head{margin-bottom:28px}
 .cvx-tag{top:12px;font-size:11.5px}.cvx-tag.l{left:12px}.cvx-tag.r{right:12px}
 .cvx-swatch{aspect-ratio:1}
 .cvx-panel{gap:22px;padding:22px}
 .cvx-plot{min-height:120px}
 .cvx-range{gap:12px;font-size:14px}
 .cvx-tones{gap:6px;font-size:14px}.cvx-tones>span{flex-basis:100%;margin:0 0 4px}
 .cvx-tones button{width:32px;height:32px}
 .cvx-map{aspect-ratio:auto;display:grid;gap:12px;padding:0 12px 12px}
 .cvx-map>canvas{position:static;height:340px;width:calc(100% + 24px);margin:0 -12px}
 .cvx-card{position:static;width:auto}
 .cvx-duo{grid-template-columns:minmax(0,1fr);gap:48px}
 .cvx-dc h3{margin-top:20px;font-size:22px}.cvx-dc p{font-size:16px}
 .cvx-dart{aspect-ratio:1}
 /* the video comes straight after the heading, the facts after it */
 .cvx-split{display:flex;flex-direction:column;align-items:stretch;gap:0}.cvx-side{display:contents}.cvx-fig{order:1}.cvx-facts{order:2;margin-top:36px}.cvx-more{order:3}
}