:root {
  --bg: #000; --label: #fff; --label-2: #b8b8bd; --label-3: #96969e;
  --tint: #ffd60a; --red: #ff665e; --green: #66db87; --hair: #38383b;
  --glass: rgba(18,18,18,.88); --spring: cubic-bezier(.32,.72,0,1);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", Inter, system-ui, sans-serif;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--label); font: 17px/1.4 var(--font); -webkit-font-smoothing: antialiased; overflow: hidden; }
button { font: inherit; -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--tint); outline-offset: 4px; }
.skip-link { position: fixed; left: 16px; top: 12px; z-index: 100; padding: 18px 24px; border-radius: 14px; background: var(--tint); color: #000; font-weight: 700; transform: translateY(-160%); }
.skip-link:focus { transform: none; }
#app { position: fixed; inset: 0; }
video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; background: #000; } /* the whole picture the camera sees, never a zoomed crop */
.glass { background: var(--glass); -webkit-backdrop-filter: blur(24px); backdrop-filter: blur(24px); border: 1px solid var(--hair); }
.top { position: absolute; z-index: 10; top: max(12px, env(safe-area-inset-top)); left: 16px; right: 16px; display: grid; grid-template-columns: auto minmax(0,1fr) auto; align-items: center; gap: 12px; min-height: 80px; padding: 6px 14px 6px 8px; border-radius: 22px; }
.back { display: inline-flex; align-items: center; gap: 9px; min-height: 64px; padding: 8px 10px; border-radius: 14px; color: var(--label); text-decoration: none; }
.back img { width: 32px; height: 32px; border-radius: 9px; }
.brand-name { font-size: 23px; font-weight: 750; letter-spacing: -.04em; }
.home-label { margin-left: 2px; padding-left: 10px; border-left: 1px solid var(--hair); font-size: 14px; color: var(--label-2); }
.mode-title { justify-self: center; margin: 0; font-size: 19px; font-weight: 600; letter-spacing: -.025em; }
.count { max-width: 220px; color: var(--label-2); font-size: 14px; font-weight: 500; font-variant-numeric: tabular-nums; text-align: right; overflow-wrap: anywhere; }
.sheet { position: absolute; z-index: 2; left: 16px; right: 16px; bottom: max(16px, env(safe-area-inset-bottom)); display: grid; gap: 18px; max-height: 50dvh; overflow-y: auto; padding: 22px; border-radius: 26px; }
.caption { margin: 0; min-height: 2.5em; font-size: clamp(24px, 3.4vw, 40px); line-height: 1.25; font-weight: 600; letter-spacing: -.025em; overflow-wrap: anywhere; text-wrap: pretty; }
.caption.warn { color: var(--red); }
.primary, .cta { display: inline-flex; align-items: center; justify-content: center; min-height: 64px; padding: 18px 28px; border: 0; border-radius: 999px; color: #000; background: var(--tint); font: 650 19px/1.3 var(--font); cursor: pointer; transition: background-color .2s, transform .2s var(--spring); }
.primary:active, .cta:active { transform: scale(.98); }
#chips { position: absolute; inset: 0; pointer-events: none; }
.chip { position: absolute; top: 34%; transform: translateX(-50%); max-width: 80vw; padding: 9px 14px; border-radius: 14px; font: 600 15px/1.3 var(--font); color: #000; background: rgba(255,255,255,.94); box-shadow: 0 4px 18px #0006; transition: opacity .4s; overflow-wrap: anywhere; }
.chip.person { background: var(--tint); }
.chip.hazard { background: var(--red); }
.chip.door, .chip.stairs { background: var(--green); }
.chip small { margin-left: 6px; font-weight: 500; }
.chip.old { opacity: 0; }
.start { position: absolute; inset: 0; z-index: 5; display: grid; align-content: center; justify-items: start; gap: 24px; padding: max(120px, calc(env(safe-area-inset-top) + 110px)) max(28px, 8vw) max(28px, env(safe-area-inset-bottom)); background: #000; overflow-y: auto; }
.start[hidden] { display: none; }
.eyebrow { margin: 0; color: var(--tint); font-size: 13px; font-weight: 650; letter-spacing: .07em; text-transform: uppercase; }
.hero-title { margin: 0; max-width: 14ch; font-size: clamp(48px, 6.5vw, 96px); line-height: 1; letter-spacing: -.06em; font-weight: 750; }
.start .intro { margin: 0; max-width: 36ch; color: var(--label-2); font-size: clamp(18px, 2vw, 24px); line-height: 1.45; text-wrap: pretty; }
.start .fine { margin: 0; max-width: 52ch; color: var(--label-3); font-size: 15px; line-height: 1.5; }
@media (hover:hover) { .primary:hover, .cta:hover { background: #ffe044; } .back:hover { background: #ffffff0c; } }
@media (max-width:700px) {
  .top { left: 12px; right: 12px; gap: 8px; padding-right: 12px; }
  .back { gap: 7px; padding-inline: 6px; }
  .back img { width: 28px; height: 28px; }
  .brand-name { display: none; }
  .home-label { margin: 0; padding: 0; border: 0; font-size: 14px; color: var(--label); }
  .mode-title { font-size: 17px; }
  .count { max-width: 100px; font-size: 12px; line-height: 1.3; }
  .sheet { left: 12px; right: 12px; padding: 18px; gap: 14px; border-radius: 24px; }
  .caption { font-size: 25px; }
  .start { padding-inline: 24px; gap: 22px; }
  .hero-title { font-size: clamp(46px, 13vw, 68px); }
  .start .intro { font-size: 18px; }
  .start .cta { width: 100%; }
  .start .fine { font-size: 14px; }
}
@media (max-height:480px) {
  .start { align-content: start; padding-top: 116px; gap: 14px; }
  .hero-title { font-size: 42px; }
  .start .intro { max-width: 60ch; font-size: 17px; }
  .sheet { max-height: 48dvh; padding: 14px; }
  .caption { font-size: 22px; min-height: 0; }
}
@media (prefers-reduced-motion:reduce) { *, *::before, *::after { transition:none !important; animation:none !important; } }

#boxes { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }

/* Proximity alarm: a red edge that pulses harder as something in the path gets closer; stairs flash orange. */
#edge { position: absolute; inset: 0; pointer-events: none; --near: 0; box-shadow: inset 0 0 calc(var(--near) * 90px) calc(var(--near) * 18px) rgba(255, 69, 58, calc(var(--near) * 0.9)); transition: box-shadow .15s; animation: edgepulse .5s ease-in-out infinite alternate; }
#edge.stairs { box-shadow: inset 0 0 120px 30px rgba(255, 159, 10, .95); }
@keyframes edgepulse { from { opacity: .65; } to { opacity: 1; } }
@media (prefers-reduced-motion: reduce) { #edge { animation: none; } }

/* Lens confirmation shares the existing right-hand status column. */
.camera-status { display: grid; justify-items: end; gap: 4px; min-width: 0; }
.lens-status { max-width: 150px; padding: 3px 8px; border: 1px solid var(--hair); border-radius: 999px; color: var(--tint); font-size: 11px; line-height: 1.3; overflow-wrap: anywhere; }
.lens-status[hidden] { display: none; }