:root {
  --bg: #05060a;
  --fg: #ffffff;
  --muted: rgba(255, 255, 255, .82);
  --accent: #ff7a18;
  --listen: #00d4ff;
  --ok: #36d399;
  --glass: rgba(16, 18, 28, .55);
  --stroke: rgba(255, 255, 255, .26);
  --focus: #ffd166;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
}

/* focus is ALWAYS visible (keyboard accessibility) */
:focus-visible {
  outline: 4px solid var(--focus);
  outline-offset: 3px;
  border-radius: 14px;
}

#cam {
  position: fixed; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  filter: brightness(.42) saturate(1.05);
  z-index: 0;
}

/* depth scrims over the camera: bright in the centre, dark at the edges where text/bars sit */
body::before, body::after {
  content: ""; position: fixed; left: 0; right: 0; z-index: 1; pointer-events: none;
}
body::before { top: 0; height: 34vh; background: linear-gradient(to bottom, rgba(5,6,10,.80), transparent); }
body::after { bottom: 0; height: 42vh; background: linear-gradient(to top, rgba(5,6,10,.90), transparent); }

/* tappable stage */
#stage {
  position: fixed; inset: 0; z-index: 2;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  text-align: center; padding: 8vmin 6vmin 24vmin;
  gap: 2.4vmin; cursor: pointer; user-select: none;
}

#halo {
  position: absolute; width: 60vmin; height: 60vmin; border-radius: 50%;
  background: radial-gradient(circle, rgba(255,122,24,.16), transparent 62%);
  transition: transform .25s ease, background .25s ease; pointer-events: none;
}
body[data-state="listening"] #halo { background: radial-gradient(circle, rgba(0,212,255,.34), transparent 60%); animation: pulse 1.1s ease-in-out infinite; }
body[data-state="thinking"]  #halo { background: radial-gradient(circle, rgba(255,122,24,.30), transparent 60%); animation: spin 1.4s linear infinite; }
body[data-state="speaking"]  #halo { background: radial-gradient(circle, rgba(54,211,153,.30), transparent 60%); animation: breathe 1.9s ease-in-out infinite; }
@keyframes pulse { 0%,100%{transform:scale(1.06)} 50%{transform:scale(1.20)} }
@keyframes spin { to { transform: rotate(360deg) } }
@keyframes breathe { 0%,100%{transform:scale(1.05);opacity:.88} 50%{transform:scale(1.13);opacity:1} }

/* the answer rises in when Iris starts speaking */
body[data-state="speaking"] #answer { animation: rise .42s cubic-bezier(.2,.7,.2,1); }
@keyframes rise { from{opacity:0;transform:translateY(10px)} to{opacity:1;transform:none} }

/* brand mark (the iris): the product identity, shown at idle only */
#brand {
  position: relative; z-index: 2; display: flex; justify-content: center;
  margin-bottom: 1.4vmin; filter: drop-shadow(0 6px 26px rgba(0,0,0,.6));
}
.iris-mark { width: clamp(76px, 16vmin, 124px); height: auto; display: block; animation: gaze 5.5s ease-in-out infinite; }
@keyframes gaze { 0%,100%{transform:scale(1)} 50%{transform:scale(1.045)} }
body[data-state="listening"] #brand,
body[data-state="thinking"]  #brand,
body[data-state="speaking"]  #brand { display: none; }

#status {
  position: relative; z-index: 2;
  font-size: clamp(24px, 6vmin, 48px); font-weight: 800;
  text-shadow: 0 2px 18px rgba(0,0,0,.85);
}
/* at idle, "Iris" reads as a wordmark under the mark */
body[data-state=""] #status, body:not([data-state]) #status { letter-spacing: .16em; }
#answer {
  position: relative; z-index: 2;
  font-size: clamp(20px, 4.6vmin, 34px); font-weight: 600; line-height: 1.32;
  max-width: 92vw; min-height: 1.2em; text-shadow: 0 2px 18px rgba(0,0,0,.9);
}
#hint {
  position: relative; z-index: 2;
  font-size: clamp(13px, 2.8vmin, 18px); color: var(--muted);
  text-shadow: 0 2px 12px rgba(0,0,0,.9);
}

/* top bar */
#topbar {
  position: fixed; top: max(3vmin, env(safe-area-inset-top, 0)); left: 0; right: 0;
  z-index: 4; display: flex; justify-content: space-between; padding: 0 5vmin;
}
.chip {
  min-width: 56px; min-height: 56px; padding: 0 18px;
  background: var(--glass); color: var(--fg);
  border: 2px solid var(--stroke); border-radius: 999px;
  font-size: 20px; font-weight: 800; cursor: pointer;
  backdrop-filter: blur(10px);
}
.chip[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: #1a1206; }

/* control bar (low vision / keyboard / screen reader) */
#controls {
  position: fixed; left: 0; right: 0;
  bottom: max(4vmin, env(safe-area-inset-bottom, 0)); z-index: 4;
  display: flex; align-items: flex-end; justify-content: center; gap: 4vmin;
}
.ctl {
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  min-width: 88px; min-height: 88px; padding: 12px 10px;
  background: var(--glass); color: var(--fg);
  border: 2px solid var(--stroke); border-radius: 24px;
  font-size: 16px; font-weight: 700; cursor: pointer;
  backdrop-filter: blur(12px); transition: transform .1s ease, background .15s ease;
}
.ctl:active { transform: scale(.95); }
.ctl .ic { display: flex; align-items: center; justify-content: center; }
.ctl .ic svg { width: 28px; height: 28px; display: block; }
.ctl-lbl { font-size: 15px; letter-spacing: .01em; }
.ctl.primary {
  min-width: 116px; min-height: 116px; border-radius: 50%;
  background: var(--accent); color: #1a1206; border-color: var(--accent);
  font-size: 18px; box-shadow: 0 8px 30px rgba(255,122,24,.4);
}
.ctl.primary .ic svg { width: 42px; height: 42px; }
/* idle: the primary button breathes a warm glow to invite the first tap */
body[data-state=""] .ctl.primary { animation: invite 2.6s ease-in-out infinite; }
@keyframes invite { 0%,100%{box-shadow:0 8px 30px rgba(255,122,24,.40)} 50%{box-shadow:0 10px 46px rgba(255,122,24,.66)} }

#btn-live.on { background: var(--ok); border-color: var(--ok); color: #062018; position: relative; }
/* live recording dot, pulsing like a real "on air" light */
#btn-live.on::after {
  content: ""; position: absolute; top: 12px; right: 12px;
  width: 12px; height: 12px; border-radius: 50%; background: #ff3b30;
  box-shadow: 0 0 0 0 rgba(255,59,48,.65); animation: livedot 1.5s ease-out infinite;
}
@keyframes livedot { 0%{box-shadow:0 0 0 0 rgba(255,59,48,.65)} 100%{box-shadow:0 0 0 11px rgba(255,59,48,0)} }

/* ===== accessible mode (max contrast + larger text) ===== */
body.a11y-boost { --glass: rgba(0,0,0,.92); --stroke: #ffffff; }
body.a11y-boost #cam { filter: brightness(.25); }
body.a11y-boost #status { font-size: clamp(30px, 8vmin, 60px); }
body.a11y-boost #answer { font-size: clamp(26px, 6vmin, 44px); font-weight: 800; }
body.a11y-boost .ctl, body.a11y-boost .chip { font-size: 20px; border-width: 3px; color: #fff; }
body.a11y-boost .ctl-lbl { font-weight: 900; }

/* respect the OS preferences */
@media (prefers-contrast: more) { :root { --glass: rgba(0,0,0,.9); --stroke: #fff; } }
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }