:root {
  --bg: #000;
  --fg: #e6e6e6;
  --text: #cfcfcf;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Arial, sans-serif;
  overflow: hidden;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: none;
}

@media (pointer: coarse) {
  canvas {
    cursor: default;
  }
}

.author {
  position: fixed;
  left: 10px;
  top: 10px;
  z-index: 6;
  font-weight: 700;
  font-size: 14px;
  color: #bfbfbf;
  user-select: none;
  letter-spacing: .2px;
}

.author .name {
  background: linear-gradient(120deg, #eee, #bbb, #ddd, #bdbdbd, #eee);
  background-size: 220% 220%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: shine 9s linear infinite;
}

@keyframes shine {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.panel {
  position: fixed;
  left: 10px;
  bottom: 10px;
  z-index: 5;
  background: #111;
  border: 1px solid #1e1e1e;
  border-radius: 10px;
  padding: 8px 10px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: #bdbdbd;
  user-select: none;
}

.sw {
  display: flex;
  gap: 6px;
}

.sw button {
  width: 26px;
  height: 18px;
  border-radius: 6px;
  border: 1px solid #2a2a2a;
  padding: 0;
  cursor: pointer;
}

.sw button[data-col="white"] { background: #e6e6e6; }
.sw button[data-col="gray"] { background: #c1c1c1; }
.sw button[data-col="lime"] { background: #bfecc0; }
.sw button[data-col="blue"] { background: #c8dfff; }

.sw button.active {
  outline: 2px solid #3a3a3a;
}

.overlay {
  position: fixed;
  inset: 0;
  z-index: 10;
  background: rgba(0, 0, 0, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.overlay .start {
  padding: 20px 50px;
  background: #1a1a1a;
  border: 2px solid #3a3a3a;
  border-radius: 12px;
  color: #fff;
  font-size: 20px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
}

.overlay .start:hover {
  background: #2a2a2a;
  border-color: #5a5a5a;
  transform: scale(1.1);
  box-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
}