:root {
  --bg: #0b1020;
  --panel: rgba(255, 255, 255, 0.06);
  --text: rgba(255, 255, 255, 0.9);
  --muted: rgba(255, 255, 255, 0.65);
  --wire: rgba(255, 255, 255, 0.35);
  --bulb-off: #d8d8d8;
  --bulb-on: #ffe27a;
  --glow: rgba(255, 216, 90, 0.92);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: radial-gradient(1200px 700px at 50% 30%, #18224a, var(--bg));
  color: var(--text);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
}

.app {
  width: min(720px, calc(100vw - 32px));
  padding: 24px;
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.04));
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.45);
}

.title {
  margin: 0 0 6px;
  font-size: 18px;
  letter-spacing: 0.2px;
}

.subtitle {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 13px;
}

.stage {
  position: relative;
  height: 280px;
  border-radius: 14px;
  background: rgba(0, 0, 0, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.10);
  display: grid;
  place-items: center;
  overflow: hidden;
}

.stage::after {
  content: "";
  position: absolute;
  inset: -40%;
  background: radial-gradient(circle at 50% 55%, rgba(255, 216, 90, 0.28), transparent 55%);
  opacity: 0;
  filter: blur(18px);
  transition: opacity 220ms ease;
  pointer-events: none;
}

.stage.lit::after {
  opacity: 1;
}

.wire {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 70px;
  background: linear-gradient(180deg, transparent, var(--wire));
  border-radius: 999px;
}

.bulb {
  position: relative;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #ffffff, var(--bulb-off) 55%, #b8b8b8 100%);
  box-shadow: inset 0 -10px 18px rgba(0, 0, 0, 0.25);
  transition: transform 160ms ease, box-shadow 200ms ease, filter 220ms ease;
  will-change: transform, box-shadow, filter;
  cursor: pointer;
}

.bulb::before {
  content: "";
  position: absolute;
  inset: -70px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--glow) 0%, rgba(255, 216, 90, 0.35) 35%, transparent 70%);
  opacity: 0;
  filter: blur(14px);
  transition: opacity 220ms ease;
  pointer-events: none;
  mix-blend-mode: screen;
}

.bulb::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -26px;
  transform: translateX(-50%);
  width: 54px;
  height: 40px;
  border-radius: 10px 10px 12px 12px;
  background: linear-gradient(180deg, #8f959c, #5a6168);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35);
}

.bulb.on {
  background: radial-gradient(circle at 35% 30%, #ffffff, var(--bulb-on) 55%, #d9b64d 100%);
  box-shadow:
    0 0 40px rgba(255, 216, 90, 0.55),
    0 0 90px rgba(255, 216, 90, 0.30),
    0 0 160px rgba(255, 216, 90, 0.18),
    inset 0 -10px 18px rgba(0, 0, 0, 0.20);
  filter:
    saturate(1.35)
    brightness(1.08)
    drop-shadow(0 0 20px rgba(255, 216, 90, 0.55))
    drop-shadow(0 0 60px rgba(255, 216, 90, 0.25));
  transform: translateY(-2px);
}

.bulb.on::before {
  opacity: 1;
}

.bulb:focus-visible {
  outline: 2px solid rgba(255, 216, 90, 0.55);
  outline-offset: 6px;
}

.controls {
  margin-top: 16px;
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
}

button {
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 600;
  letter-spacing: 0.2px;
  transition: transform 120ms ease, background 160ms ease, border-color 160ms ease;
}

button:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.24);
}

button:active {
  transform: translateY(1px);
}

button.primary {
  border-color: rgba(255, 216, 90, 0.35);
  background: rgba(255, 216, 90, 0.16);
}

.status {
  margin-top: 10px;
  text-align: center;
  font-size: 13px;
  color: var(--muted);
}