:root {
  --bg: #050608;
  --bg2: #0b1020;
  --text: #e8ecff;
  --accent: #7c5cff;
  --accent2: #00d4ff;
  --glow: rgba(124, 92, 255, 0.45);
}

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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: Arial, Helvetica, sans-serif;
  background:
    radial-gradient(circle at center, rgba(124, 92, 255, 0.12), transparent 35%),
    radial-gradient(circle at 20% 20%, rgba(0, 212, 255, 0.10), transparent 25%),
    linear-gradient(135deg, var(--bg), var(--bg2));
  color: var(--text);
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: radial-gradient(circle, rgba(255,255,255,0.10), transparent 40%);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

body.flash::before {
  opacity: 1;
}

.center {
  text-align: center;
  z-index: 2;
}

h1 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  letter-spacing: 0.5px;
}

p {
  opacity: 0.8;
  margin-bottom: 1.8rem;
}

button {
  width: 180px;
  height: 180px;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  color: white;
  font-size: 1.1rem;
  font-weight: bold;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  box-shadow: 0 0 25px var(--glow), inset 0 0 20px rgba(255,255,255,0.12);
  transition: transform 0.15s ease, box-shadow 0.2s ease, filter 0.2s ease;
  position: relative;
}

button:hover {
  transform: scale(1.05);
  filter: brightness(1.05);
  box-shadow: 0 0 40px rgba(124, 92, 255, 0.7), 0 0 80px rgba(0, 212, 255, 0.18);
}

button:active {
  transform: scale(0.96);
}

.pulse {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  background:
    radial-gradient(circle at center, rgba(124, 92, 255, 0.24), transparent 30%),
    radial-gradient(circle at center, rgba(0, 212, 255, 0.14), transparent 45%);
  transition: opacity 0.25s ease, transform 0.35s ease;
  transform: scale(0.95);
}

.pulse.active {
  opacity: 1;
  transform: scale(1.02);
}