:root {
  --bg: #404040;
  --panel: #e8e8e8;
  --text: #333;
  --muted: #666;
  --accent: #555;
  --border: #ccc;
  --disabled: #999;
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, Arial, Helvetica, sans-serif;
}

header {
  padding: 12px 18px;
  text-align: center;
}

h1 {
  margin: 0;
  font-weight: 600;
  color: white;
}

main {
  display: flex;
  gap: 16px;
  padding: 12px;
  align-items: flex-start;
  justify-content: center;
}

#left {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

#canvas-container {
  background: #ddd;
  padding: 8px;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

canvas {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--border);
  background: #fff;
}

#controls {
  width: 320px;
  background: var(--panel);
  border-radius: 10px;
  padding: 14px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  border: 1px solid var(--border);
}

#controls h2 {
  margin: 0 0 8px 0;
  font-size: 18px;
  color: var(--text);
}

.control-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 8px 0;
}

.control-row label {
  flex: 1;
  font-size: 13px;
  color: var(--muted);
}

.control-row input[type="range"] {
  flex: 1;
}

.control-row select, 
.control-row input[type="file"], 
.control-row button {
  flex: 1;
  padding: 8px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.control-row select:hover,
.control-row button:hover {
  background: #f9f9f9;
  border-color: var(--accent);
}

.control-row button:active {
  background: #e9e9e9;
  transform: translateY(1px);
}

.control-row input[type="file"] {
  cursor: pointer;
}

.control-row input[type="file"]:hover {
  background: #f9f9f9;
}

.buttons {
  justify-content: space-between;
}

.control-footer {
  margin-top: 10px;
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}

/* Disabled state for dither controls */
.control-row.disabled {
  opacity: 0.5;
  pointer-events: none;
}

.control-row.disabled label {
  color: var(--disabled);
}

.control-row.disabled input {
  opacity: 0.5;
}