*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; }
body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: system-ui, -apple-system, sans-serif;
  background: #0a0a0a;
  color: #fafafa;
  overflow: hidden;
}

canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.ui {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 10;
}

button {
  background: rgba(0, 220, 190, 0.12);
  border: 1px solid rgba(0, 220, 190, 0.35);
  color: #00dcc0;
  padding: 9px 22px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  font-family: system-ui, -apple-system, sans-serif;
  letter-spacing: 0.06em;
  transition: background 0.2s, border-color 0.2s, transform 0.1s;
  backdrop-filter: blur(6px);
}

button:hover {
  background: rgba(0, 220, 190, 0.22);
  border-color: rgba(0, 220, 190, 0.6);
}

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

.hint {
  position: fixed;
  bottom: 22px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 13px;
  color: rgba(0, 220, 190, 0.3);
  pointer-events: none;
  letter-spacing: 0.07em;
  z-index: 10;
  white-space: nowrap;
}