:root {
  --ink: #0a0c0f;
  --glass: rgba(10, 12, 16, 0.44);
  --glass-strong: rgba(8, 10, 13, 0.62);
  --glass-edge: rgba(255, 255, 255, 0.16);
  --mist-white: #f3f6f7;
  --accent: #f4f4f2;
  --accent-strong: #ffffff;
  --safe-t: env(safe-area-inset-top, 0px);
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-l: env(safe-area-inset-left, 0px);
  --safe-r: env(safe-area-inset-right, 0px);
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  background: #000;
  overflow: hidden;
  font-family: 'Sora', system-ui, sans-serif;
  -webkit-tap-highlight-color: transparent;
}

#stage {
  position: relative;
  width: 100vw;
  height: 100dvh;
  overflow: hidden;
  background: #050607;
  touch-action: none;
}

#webcam {
  position: absolute;
  width: 2px;
  height: 2px;
  opacity: 0;
  pointer-events: none;
  left: -9999px;
}

#canvas-base, #canvas-fog, #canvas-fx {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}
#canvas-base { z-index: 1; }
#canvas-fog { z-index: 2; }
#canvas-fx { z-index: 3; pointer-events: none; }

/* ---------- brand mark ---------- */
#brand {
  position: absolute;
  top: calc(18px + var(--safe-t));
  left: calc(18px + var(--safe-l));
  z-index: 10;
  pointer-events: none;
}
#brand-mark {
  height: 92px;
  width: auto;
  display: block;
  filter: brightness(0) invert(1) drop-shadow(0 3px 14px rgba(0,0,0,0.6));
  opacity: 0.97;
}
@media (min-width: 640px) {
  #brand-mark { height: 140px; }
}

/* ---------- instruction ---------- */
#instruction {
  position: absolute;
  left: 50%;
  bottom: calc(96px + var(--safe-b));
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-align: center;
  padding: 0 20px;
  max-width: 92vw;
  pointer-events: none;
  transition: opacity 0.5s ease;
}
#instruction-text {
  font-family: 'Fraunces', Georgia, serif;
  font-style: italic;
  font-weight: 500;
  font-size: 19px;
  color: var(--mist-white);
  text-shadow: 0 2px 14px rgba(0,0,0,0.65), 0 1px 2px rgba(0,0,0,0.5);
  letter-spacing: 0.01em;
  transition: opacity 0.35s ease, transform 0.35s ease;
}
@media (min-width: 640px) {
  #instruction-text { font-size: 22px; }
}
#tap-to-mist {
  pointer-events: auto;
  background: none;
  border: none;
  color: rgba(243,246,247,0.68);
  font-family: 'Sora', sans-serif;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(243,246,247,0.35);
  padding: 6px 8px;
  cursor: pointer;
  transition: color 0.2s ease;
}
#tap-to-mist:hover { color: var(--mist-white); }
#tap-to-mist.hidden { display: none; }

/* ---------- controls cluster ---------- */
#controls {
  position: absolute;
  right: calc(16px + var(--safe-r));
  bottom: calc(20px + var(--safe-b));
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: opacity 0.4s ease, transform 0.4s ease;
}
#controls.hidden { opacity: 0; transform: translateY(8px); pointer-events: none; }

.ctl-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 44px;
  min-width: 44px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--glass-edge);
  background: var(--glass);
  backdrop-filter: blur(14px) saturate(1.3);
  -webkit-backdrop-filter: blur(14px) saturate(1.3);
  color: var(--mist-white);
  cursor: pointer;
  transition: background 0.2s ease, transform 0.15s ease, opacity 0.2s ease;
  font-family: 'Sora', sans-serif;
  font-size: 13.5px;
  font-weight: 500;
}
.ctl-btn:not(.ctl-btn--primary) { width: 44px; padding: 0; }
.ctl-btn svg { width: 18px; height: 18px; flex: none; }
.ctl-btn:active { transform: scale(0.92); }
.ctl-btn:disabled { opacity: 0.35; pointer-events: none; }
.ctl-btn--primary {
  background: linear-gradient(180deg, var(--accent-strong), var(--accent));
  border-color: rgba(255,255,255,0.5);
  color: var(--ink);
  box-shadow: 0 4px 18px rgba(0,0,0,0.28);
}
.ctl-btn--primary svg { width: 15px; height: 15px; }
#btn-play-label { white-space: nowrap; }

@media (max-width: 560px) {
  #btn-play-label { display: none; }
  .ctl-btn--primary { padding: 0; width: 50px; height: 50px; }
  .ctl-btn { height: 46px; min-width: 46px; }
  #instruction { bottom: calc(84px + var(--safe-b)); }
}

/* ---------- replay panel ---------- */
#replay-panel {
  position: absolute;
  left: 50%;
  bottom: calc(96px + var(--safe-b));
  transform: translateX(-50%);
  z-index: 11;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 16px 22px;
  border-radius: 20px;
  background: var(--glass-strong);
  border: 1px solid var(--glass-edge);
  backdrop-filter: blur(18px) saturate(1.3);
  -webkit-backdrop-filter: blur(18px) saturate(1.3);
  max-width: 92vw;
  text-align: center;
  transition: opacity 0.4s ease, transform 0.4s ease;
}
#replay-panel.hidden { opacity: 0; transform: translate(-50%, 10px); pointer-events: none; }
#replay-caption {
  margin: 0;
  font-family: 'Fraunces', Georgia, serif;
  font-style: italic;
  font-size: 16px;
  color: var(--mist-white);
}
.replay-actions { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; }
.replay-actions button {
  border: 1px solid var(--glass-edge);
  background: rgba(255,255,255,0.06);
  color: var(--mist-white);
  font-family: 'Sora', sans-serif;
  font-size: 12.5px;
  font-weight: 500;
  padding: 9px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.2s ease;
}
.replay-actions button:hover { background: rgba(255,255,255,0.14); }
#btn-replay-play { background: linear-gradient(180deg, var(--accent-strong), var(--accent)); color: var(--ink); border-color: transparent; font-weight: 600; }

/* ---------- start screen ---------- */
#start-screen {
  position: absolute;
  inset: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(120% 120% at 50% 20%, #1b1f24 0%, #060708 70%);
  transition: opacity 0.6s ease;
  padding: 24px;
}
#start-screen.hidden { opacity: 0; pointer-events: none; }
.start-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
  text-align: center;
  max-width: 380px;
}
.start-logo {
  width: 190px;
  filter: brightness(0) invert(1);
  opacity: 0.95;
}
.start-tagline {
  margin: 0;
  font-family: 'Fraunces', Georgia, serif;
  font-style: italic;
  font-weight: 400;
  font-size: 17px;
  line-height: 1.5;
  color: rgba(243,246,247,0.82);
}
#btn-start {
  font-family: 'Sora', sans-serif;
  font-weight: 600;
  font-size: 14.5px;
  letter-spacing: 0.01em;
  color: var(--ink);
  background: linear-gradient(180deg, var(--accent-strong), var(--accent));
  border: none;
  padding: 15px 28px;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: 0 8px 26px rgba(0,0,0,0.35);
  transition: transform 0.15s ease;
}
#btn-start:active { transform: scale(0.96); }
#btn-start:disabled { opacity: 0.6; }
.start-status {
  min-height: 16px;
  margin: 0;
  font-size: 12.5px;
  color: rgba(243,246,247,0.55);
}

.hidden { display: none !important; }

@media (prefers-reduced-motion: reduce) {
  * { transition-duration: 0.001ms !important; animation-duration: 0.001ms !important; }
}