/* ===== リセット ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ===== 基本 ===== */
body {
  font-family: 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
  background: #f0ece8;
  color: #333;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ===== ヘッダー ===== */
header {
  background: #fff;
  border-bottom: 1px solid #e0d8d0;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
  z-index: 10;
}

h1 {
  font-size: 1.1rem;
  font-weight: 700;
  color: #c05070;
  letter-spacing: 0.03em;
}

.header-actions {
  display: flex;
  gap: 8px;
}

/* ===== ヘッダーボタン ===== */
#random-btn,
#export-btn {
  background: #fff;
  border: 1.5px solid #d0c8c0;
  border-radius: 20px;
  padding: 6px 16px;
  font-size: 0.82rem;
  color: #555;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

#random-btn:hover,
#export-btn:hover {
  background: #faf8f6;
  border-color: #b0a8a0;
}

#export-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ===== メインレイアウト ===== */
main {
  display: grid;
  grid-template-columns: auto 1fr;
  flex: 1;
  overflow: hidden;
}

/* ===== プレビューパネル（左） ===== */
.preview-panel {
  background: #fff;
  border-right: 1px solid #e0d8d0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  flex-shrink: 0;
}

#preview {
  position: relative;
  width: 318px;
  height: 598px;
  background: #f8f6f4;
  border-radius: 8px;
  overflow: hidden;
}

.layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: block;
}

/* ===== 操作パネル（右） ===== */
.controls-panel {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: #faf8f6;
}

/* ===== タブバー ===== */
#tab-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  padding: 12px 14px;
  background: #fff;
  border-bottom: 1px solid #e8e4e0;
  flex-shrink: 0;
}

.tab-btn {
  background: #f0ece8;
  border: 1.5px solid #ddd8d2;
  border-radius: 20px;
  padding: 5px 14px;
  font-size: 0.78rem;
  cursor: pointer;
  color: #666;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  white-space: nowrap;
}

.tab-btn:hover {
  background: #e8e4e0;
  border-color: #c0b8b0;
}

.tab-btn.active {
  background: #c05070;
  border-color: #c05070;
  color: #fff;
  font-weight: 600;
}

/* ===== オプションパネル（flex列） ===== */
#option-panel {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

/* ===== オプショングリッド ===== */
.options-grid {
  padding: 14px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(82px, 1fr));
  gap: 8px;
  align-content: start;
}

/* ===== オプションボタン ===== */
.option-btn {
  background: #fff;
  border: 2px solid #e0dcd8;
  border-radius: 10px;
  padding: 6px 6px 5px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
  position: relative;
}

.option-btn:hover {
  border-color: #b8b0a8;
  transform: translateY(-1px);
}

.option-btn.selected {
  border-color: #c05070;
  background: #fff5f7;
}

.option-btn.selected::after {
  content: '✓';
  position: absolute;
  top: 3px;
  right: 5px;
  font-size: 0.65rem;
  color: #c05070;
  font-weight: bold;
}

/* サムネイル画像 */
.option-btn .thumb {
  width: 100%;
  aspect-ratio: 159 / 299;
  object-fit: contain;
  display: block;
  border-radius: 4px;
}

/* 「なし」オプション */
.option-btn.option-none .thumb-placeholder {
  width: 100%;
  aspect-ratio: 159 / 299;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f5f3f1;
  border-radius: 4px;
  color: #aaa;
  font-size: 1.4rem;
}

.option-btn span {
  font-size: 0.62rem;
  color: #888;
  text-align: center;
  line-height: 1.2;
}

/* ===== スクロールバー（Chrome） ===== */
#option-panel::-webkit-scrollbar {
  width: 6px;
}
#option-panel::-webkit-scrollbar-track {
  background: transparent;
}
#option-panel::-webkit-scrollbar-thumb {
  background: #d0c8c0;
  border-radius: 3px;
}

/* ===== カラーセクション ===== */
.color-section {
  border-top: 1px solid #e8e4e0;
  padding: 12px 14px 16px;
  background: #fff;
  flex-shrink: 0;
}

.color-section-title {
  font-size: 0.72rem;
  font-weight: 700;
  color: #999;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.color-slot {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.color-slot:last-child {
  margin-bottom: 0;
}

.color-slot-label {
  font-size: 0.72rem;
  color: #666;
  white-space: nowrap;
  min-width: 72px;
}

.color-swatches {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

.swatch {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.1s, border-color 0.1s;
  outline: none;
  box-shadow: 0 0 0 1px rgba(0,0,0,0.15);
  padding: 0;
}

.swatch:hover {
  transform: scale(1.2);
}

.swatch.active {
  border-color: #c05070;
  box-shadow: 0 0 0 1px #c05070;
}

/* カスタムカラーピッカー */
.color-picker {
  width: 28px;
  height: 28px;
  padding: 0;
  border: 2px solid #e0dcd8;
  border-radius: 50%;
  cursor: pointer;
  background: none;
  overflow: hidden;
  outline: none;
  transition: border-color 0.1s;
}

.color-picker:hover {
  border-color: #b0a8a0;
}

/* ===== レスポンシブ（モバイル） ===== */
@media (max-width: 680px) {
  body {
    overflow: auto;
  }

  main {
    grid-template-columns: 1fr;
    overflow: visible;
  }

  .preview-panel {
    border-right: none;
    border-bottom: 1px solid #e0d8d0;
    padding: 16px;
  }

  #preview {
    width: 200px;
    height: 377px;
  }

  .controls-panel {
    min-height: 420px;
    overflow: visible;
  }

  #option-panel {
    overflow-y: visible;
  }
}

/* ===== ローディングオーバーレイ ===== */
#loading-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(240, 236, 232, 0.92);
  z-index: 9999;
  align-items: center;
  justify-content: center;
}

.loading-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  color: #666;
  font-size: 14px;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid #ddd;
  border-top-color: #e88fa0;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}