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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #0a0a0a;
  overflow: hidden;
  color: #fff;
}

#canvas-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
}

#canvas-container canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.hint {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 18px;
  color: rgba(255, 255, 255, 0.6);
  pointer-events: none;
  opacity: 0;
  animation: fadeInOut 3s ease-in-out;
  z-index: 10;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}

@keyframes fadeInOut {
  0% { opacity: 0; transform: translate(-50%, -50%) scale(0.9); }
  20% { opacity: 1; transform: translate(-50%, -50%) scale(1); }
  80% { opacity: 1; transform: translate(-50%, -50%) scale(1); }
  100% { opacity: 0; transform: translate(-50%, -50%) scale(0.9); }
}

.ui-panel {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: rgba(20, 20, 20, 0.85);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: 16px;
  z-index: 100;
  min-width: 240px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.seed-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.seed-label {
  font-size: 11px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 1px;
}

.seed-value {
  flex: 1;
  font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
  font-size: 13px;
  color: #fff;
  word-break: break-all;
}

.btn-icon {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.7);
  width: 32px;
  height: 32px;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.btn-icon:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
}

.mode-row {
  display: flex;
  gap: 6px;
  margin-bottom: 12px;
}

.mode-btn {
  flex: 1;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.6);
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.mode-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}

.mode-btn.active {
  background: rgba(99, 102, 241, 0.2);
  border-color: rgba(99, 102, 241, 0.5);
  color: #6366f1;
}

.action-row {
  display: flex;
  gap: 8px;
}

.btn {
  flex: 1;
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: #a5b4fc;
  padding: 10px 16px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all 0.2s;
}

.btn:hover {
  background: rgba(99, 102, 241, 0.25);
  border-color: rgba(99, 102, 241, 0.5);
  color: #c7d2fe;
}

.toast {
  position: fixed;
  bottom: 100px;
  right: 24px;
  background: rgba(34, 197, 94, 0.9);
  backdrop-filter: blur(12px);
  color: #fff;
  padding: 12px 20px;
  border-radius: 8px;
  font-size: 14px;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.3s;
  pointer-events: none;
  z-index: 200;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 640px) {
  .ui-panel {
    bottom: 16px;
    right: 16px;
    left: 16px;
    min-width: auto;
  }
}