* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #1a1a2e;
  color: #e0e0e0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

header {
  padding: 20px 0 0;
}
header h1 {
  font-size: 1.2rem;
  font-weight: 600;
  color: #fff;
}

.settings-wrap {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.actions {
  padding: 0 24px 32px;
  display: flex;
  gap: 10px;
}
.actions button {
  background: #16213e;
  border: 1px solid #333;
  color: #e0e0e0;
  padding: 8px 20px;
  border-radius: 6px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.15s;
}
.actions button:hover {
  background: #1a3a6e;
  border-color: #4a7fff;
}

.toolbar {
  padding: 12px 0;
  display: inline-flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: flex-end;
}

/* Shared field wrapper */
.tool-field {
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.tool-field > label {
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #ccc;
}
.tool-field > input[type="number"] {
  background: #16213e;
  border: 1px solid #333;
  color: #e0e0e0;
  padding: 5px 6px;
  border-radius: 4px;
  font-size: 0.8rem;
  width: 52px;
  height: 28px;
  text-align: center;
}
.tool-field > input[type="number"]:focus {
  outline: none;
  border-color: #4a7fff;
}

/* Pattern thumbnails */
.patterns {
  display: flex;
  gap: 4px;
}
.patterns button {
  width: 28px;
  height: 28px;
  border-radius: 4px;
  border: 2px solid transparent;
  cursor: pointer;
  padding: 0;
  overflow: hidden;
  transition: border-color 0.15s;
  background: #000;
}
.patterns button canvas {
  width: 100%;
  height: 100%;
  display: block;
  image-rendering: pixelated;
}
.patterns button.active {
  border-color: #4a7fff;
}
.patterns button:hover:not(.active) {
  border-color: #555;
}

/* Size lock */
.size-group {
  display: flex;
  align-items: center;
  gap: 3px;
}

.size-group input[type="number"] {
  background: #16213e;
  border: 1px solid #333;
  color: #e0e0e0;
  padding: 5px 6px;
  border-radius: 4px;
  font-size: 0.8rem;
  width: 52px;
  text-align: center;
  height: 28px;
}
.size-group input[type="number"]:focus {
  outline: none;
  border-color: #4a7fff;
}
.size-group .lock-btn {
  background: none;
  border: 1px solid #333;
  color: #888;
  width: 28px;
  height: 28px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.7rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
}
.size-group .lock-btn.locked {
  color: #4a7fff;
  border-color: #4a7fff;
}
.size-group .th-field {
  display: none;
}
.size-group.unlocked .th-field {
  display: flex;
  align-items: center;
  gap: 3px;
}

/* Color pickers */
.colors {
  display: flex;
  align-items: center;
  gap: 4px;
}
.color-pick {
  position: relative;
  width: 28px;
  height: 28px;
  border-radius: 4px;
  border: 2px solid #444;
  overflow: hidden;
  cursor: pointer;
  transition: border-color 0.15s;
}
.color-pick:hover {
  border-color: #888;
}
.color-pick input[type="color"] {
  position: absolute;
  top: -4px;
  left: -4px;
  width: calc(100% + 8px);
  height: calc(100% + 8px);
  border: none;
  cursor: pointer;
  background: none;
}
.color-pick input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; }
.color-pick input[type="color"]::-webkit-color-swatch { border: none; }

/* Toggle switch */
.toggle {
  position: relative;
  display: inline-block;
  width: 46px;
  height: 28px;
  cursor: pointer;
}
.toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}
.toggle-slider {
  position: absolute;
  inset: 0;
  background: #16213e;
  border: 1px solid #333;
  border-radius: 14px;
  transition: all 0.2s;
}
.toggle-slider::before {
  content: '';
  position: absolute;
  top: 4px;
  left: 4px;
  width: 18px;
  height: 18px;
  background: #666;
  border-radius: 50%;
  transition: all 0.2s;
}
.toggle input:checked + .toggle-slider {
  background: #1a3a6e;
  border-color: #4a7fff;
}
.toggle input:checked + .toggle-slider::before {
  transform: translateX(18px);
  background: #4a7fff;
}

.total-label {
  background: #16213e;
  border: 1px solid #333;
  color: #b0b0b0;
  padding: 5px 6px;
  border-radius: 4px;
  font-size: 0.8rem;
  height: 28px;
  line-height: 16px;
  text-align: center;
}

/* Canvas */
.canvas-wrap {
  padding: 8px 24px 16px;
  max-width: 100%;
  overflow: auto;
}
canvas#canvas {
  display: block;
  background: #000;
  image-rendering: pixelated;
  max-width: 860px;
  height: auto;
}

/* Footer / SEO */
footer {
  max-width: 600px;
  padding: 24px;
  margin: 24px 0 0;
  border-top: 1px solid #a4a4ba;

}
footer h2 {
  font-size: 0.85rem;
  font-weight: 500;
  color: #a4a4ba;
  margin-bottom: 8px;
}
footer p {
  font-size: 0.75rem;
  line-height: 1.5;
  color: #a4a4ba;
  margin-bottom: 6px;
}

a {
  color: #4a7fff;
  text-decoration: none;
}