:root {
  --bg-color: #f5f5f7;
  --text-color: #1d1d1f;
  --text-secondary: #86868b;
  --text-description: #424245;
  --control-bg: white;
  --control-border: #d2d2d7;
  --canvas-shadow: rgba(0, 0, 0, 0.1);
  --accent-color: #0071e3;
  --accent-focus: rgba(0, 113, 227, 0.1);
  --loading-bg: white;
}

/* Use data-effective-theme for the actual color application */
[data-effective-theme="dark"] {
  --bg-color: #161617;
  --text-color: #f5f5f7;
  --text-secondary: #a1a1a6;
  --text-description: #d2d2d7;
  --control-bg: #2d2d2f;
  --control-border: #424245;
  --canvas-shadow: rgba(0, 0, 0, 0.5);
  --loading-bg: #161617;
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2rem;
  margin: 0;
  transition:
    background-color 0.3s,
    color 0.3s;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background:
    radial-gradient(
      ellipse 70% 55% at 8% 12%,
      rgba(0, 140, 255, 0.07) 0%,
      transparent 65%
    ),
    radial-gradient(
      ellipse 55% 65% at 92% 80%,
      rgba(130, 50, 230, 0.06) 0%,
      transparent 65%
    ),
    radial-gradient(
      ellipse 50% 45% at 78% 8%,
      rgba(255, 90, 50, 0.05) 0%,
      transparent 60%
    ),
    radial-gradient(
      ellipse 60% 50% at 28% 90%,
      rgba(10, 190, 110, 0.05) 0%,
      transparent 60%
    );
}

body[data-effective-theme="dark"]::before {
  background:
    radial-gradient(
      ellipse 70% 55% at 8% 12%,
      rgba(0, 160, 255, 0.13) 0%,
      transparent 65%
    ),
    radial-gradient(
      ellipse 55% 65% at 92% 80%,
      rgba(140, 60, 255, 0.11) 0%,
      transparent 65%
    ),
    radial-gradient(
      ellipse 50% 45% at 78% 8%,
      rgba(255, 100, 50, 0.09) 0%,
      transparent 60%
    ),
    radial-gradient(
      ellipse 60% 50% at 28% 90%,
      rgba(20, 210, 120, 0.08) 0%,
      transparent 60%
    );
}

h1 {
  margin-top: 1rem;
  margin-bottom: 1.5rem;
  font-weight: 600;
}

.theme-container {
  position: absolute;
  top: 1rem;
  right: 1rem;
}

.theme-cycle-btn {
  background: var(--control-bg);
  border: 1px solid var(--control-border);
  padding: 0.5rem 0.8rem;
  border-radius: 12px;
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
  transition: all 0.2s;
  color: var(--text-color);
}

.theme-cycle-btn:hover {
  border-color: var(--accent-color);
  transform: translateY(-1px);
}

.theme-label {
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.controls {
  margin-bottom: 1rem;
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}

select,
button,
input[type="range"] {
  padding: 0.5rem 1rem;
  font-size: 1rem;
  border-radius: 8px;
  border: 1px solid var(--control-border);
  background-color: var(--control-bg);
  color: var(--text-color);
  cursor: pointer;
}

select:focus,
button:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 4px var(--accent-focus);
}

canvas {
  background-color: white;
  box-shadow: 0 10px 30px var(--canvas-shadow);
  border-radius: 12px;
  max-width: 100%;
  height: auto;
  cursor: crosshair;
  touch-action: none;
}

.status {
  margin-top: 1rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.description {
  margin-top: 1.5rem;
  max-width: 600px;
  text-align: center;
  line-height: 1.5;
  color: var(--text-description);
}

#loading {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--loading-bg);
  color: var(--text-color);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 100;
  font-weight: 500;
}