body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: #f5f5f5;
  color: #222;
}

main {
  max-width: 1000px;
  margin: 0 auto;
  padding: 12px;
}

h1, h2 {
  text-align: center;
}

.toggle-panel {
  margin: 16px 0;
  background: white;
  border-radius: 16px;
  overflow: hidden;
}

.toggle-panel[open] {
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
}

.toggle-panel summary {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 16px;
  font-weight: bold;
  cursor: pointer;
  user-select: none;
  background: #ffffff;
  border: 2px solid #ddd;
  border-radius: 12px;
  list-style: none;
}

.toggle-panel summary::-webkit-details-marker {
  display: none;
}

.toggle-panel summary::after {
  content: "open";
  margin-left: auto;
  font-size: 12px;
  font-weight: normal;
  color: #666;
  border: 1px solid #ccc;
  border-radius: 999px;
  padding: 3px 8px;
  background: #f7f7f7;
}

.toggle-panel[open] summary::after {
  content: "close";
}

.controls {
  display: grid;
  gap: 16px;
  padding: 16px;
}

.preview-area {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.preview-card {
  background: white;
  padding: 16px;
  border-radius: 16px;
}

.tshirt {
  position: relative;
  width: 100%;
  aspect-ratio: 2449 / 2543;
}

.tshirt > * {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.shirt-color,
.print-color {
  background-color: var(--color);
  mask-repeat: no-repeat;
  mask-size: contain;
  mask-position: center;
  -webkit-mask-repeat: no-repeat;
  -webkit-mask-size: contain;
  -webkit-mask-position: center;
}

.shirt-color {
  z-index: 1;
}

.print-color {
  z-index: 2;
}

.front-shirt {
  mask-image: url("images/front-shirt-mask.png");
  -webkit-mask-image: url("images/front-shirt-mask.png");
}

.back-shirt {
  mask-image: url("images/back-shirt-mask.png");
  -webkit-mask-image: url("images/back-shirt-mask.png");
}

.front-print {
  mask-image: url("images/front-design-1.png");
  -webkit-mask-image: url("images/front-design-1.png");
}

.back-print {
  mask-image: url("images/back-design-1.png");
  -webkit-mask-image: url("images/back-design-1.png");
}

.line {
  object-fit: contain;
  pointer-events: none;
  z-index: 3;
}

.color-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(36px, 1fr));
  gap: 8px;
}

.color-button {
  width: 100%;
  aspect-ratio: 1 / 1;
  border: 2px solid #ddd;
  border-radius: 8px;
  cursor: pointer;
}

.design-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(72px, 1fr));
  gap: 10px;
}

.design-button {
  padding: 10px;
  border: 2px solid #ddd;
  border-radius: 10px;
  background: white;
  font-size: 14px;
  cursor: pointer;
}

.color-button.selected,
.design-button.selected {
  outline: 3px solid #222;
  outline-offset: 2px;
  font-weight: bold;
}

@media (max-width: 700px) {
  .preview-area {
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  .preview-card {
    padding: 8px;
    border-radius: 12px;
  }

  .preview-card h2 {
    font-size: 16px;
    margin: 0 0 8px;
  }
}

.item-type {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
}

.type-button {
  flex: 1;
  padding: 12px;
  border: 2px solid #ddd;
  border-radius: 12px;
  background: white;
  cursor: pointer;
  font-size: 16px;
}

.type-button.selected {
  background: #222;
  color: white;
}

.custom-color {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: 8px;
}

.custom-color input[type="color"] {
  width: 56px;
  height: 40px;
  padding: 0;
  border: 2px solid #ddd;
  border-radius: 8px;
  background: white;
  cursor: pointer;
}

.custom-color span {
  font-family: monospace;
  font-size: 14px;
}