/* タブナビゲーション用スタイル */
.tab-container {
  display: flex;
  gap: 0;
  margin-bottom: 0;
  padding: 0 20px;
  width: 100%;
  max-width: 960px;
  box-sizing: border-box;
  position: relative;
}

/* タブボタンの基本スタイル */
.tab-container .nav-tab-btn {
  padding: 0px 16px 3px 16px;
  background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
  border: 2px solid #dee2e6;
  border-bottom: none;
  border-radius: 0 0 12px 12px;
  cursor: pointer;
  font-size: 14px;
  transition: all 0.3s ease;
  position: relative;
  color: #495057;
  font-weight: 500;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  overflow: hidden;
  margin-top: 0;
  transform: translateY(-2px);
  height: auto;
  line-height: normal;
  min-height: auto;
}

.tab-container .nav-tab-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: left 0.5s;
}

.tab-container .nav-tab-btn:hover::before {
  left: 100%;
}

.tab-container .nav-tab-btn:hover {
  color: #FFD700;
  background: linear-gradient(135deg, #f1f3f4 0%, #e8eaed 100%);
  transform: translateY(-4px);
  border-color: #adb5bd;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

/* 一括汎用タブ（落ち着いた赤系） */
.tab-container .nav-tab-btn.nav-tab-origin {
  background: linear-gradient(135deg, #a94442 0%, #8b2635 100%);
  border-color: #7a1e2a;
  color: white;
  box-shadow: 0 2px 8px rgba(169, 68, 66, 0.3);
}

.tab-container .nav-tab-btn.nav-tab-origin:hover {
  background: linear-gradient(135deg, #c05553 0%, #a94442 100%);
  box-shadow: 0 4px 12px rgba(169, 68, 66, 0.4);
}

/* シンプル横並べタブ（落ち着いたオレンジ系） */
.tab-container .nav-tab-btn.nav-tab-row {
  background: linear-gradient(135deg, #d68910 0%, #b8860b 100%);
  border-color: #a67c00;
  color: white;
  box-shadow: 0 2px 8px rgba(214, 137, 16, 0.3);
}

.tab-container .nav-tab-btn.nav-tab-row:hover {
  background: linear-gradient(135deg, #e6a23c 0%, #d68910 100%);
  box-shadow: 0 4px 12px rgba(214, 137, 16, 0.4);
}

/* 単一画像リサイズタブ（明るいオレンジ系） */
.tab-container .nav-tab-btn.nav-tab-simple {
  background: linear-gradient(135deg, #ff8c42 0%, #ff6b35 100%);
  border-color: #e55a2b;
  color: white;
  box-shadow: 0 2px 8px rgba(255, 107, 53, 0.3);
}

.tab-container .nav-tab-btn.nav-tab-simple:hover {
  background: linear-gradient(135deg, #ffa726 0%, #ff8c42 100%);
  box-shadow: 0 4px 12px rgba(255, 107, 53, 0.4);
}

/* サムネイル生成タブ（落ち着いた緑系） */
.tab-container .nav-tab-btn.nav-tab-thumbnail {
  background: linear-gradient(135deg, #5cb85c 0%, #449d44 100%);
  border-color: #3d8b3d;
  color: white;
  box-shadow: 0 2px 8px rgba(92, 184, 92, 0.3);
}

.tab-container .nav-tab-btn.nav-tab-thumbnail:hover {
  background: linear-gradient(135deg, #67c23a 0%, #5cb85c 100%);
  box-shadow: 0 4px 12px rgba(92, 184, 92, 0.4);
}

/* 画像トリミングタブ（落ち着いた紫系） */
.tab-container .nav-tab-btn.nav-tab-trim {
  background: linear-gradient(135deg, #8e44ad 0%, #7d3c98 100%);
  border-color: #6c3483;
  color: white;
  box-shadow: 0 2px 8px rgba(142, 68, 173, 0.3);
}

.tab-container .nav-tab-btn.nav-tab-trim:hover {
  background: linear-gradient(135deg, #9b59b6 0%, #8e44ad 100%);
  box-shadow: 0 4px 12px rgba(142, 68, 173, 0.4);
}

/* URL検出タブ（落ち着いたオレンジ系） */
.tab-container .nav-tab-btn.nav-tab-url {
  background: linear-gradient(135deg, #e57373 0%, #d32f2f 100%);
  border-color: #c62828;
  color: white;
  box-shadow: 0 2px 8px rgba(229, 115, 115, 0.3);
}

.tab-container .nav-tab-btn.nav-tab-url:hover {
  background: linear-gradient(135deg, #ef5350 0%, #e57373 100%);
  box-shadow: 0 4px 12px rgba(229, 115, 115, 0.4);
}

/* アクティブ状態 */
.tab-container .nav-tab-btn.nav-tab-active {
  color: white;
  font-weight: bold;
  padding: 8px 16px 14px 16px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  border-width: 2px;
  transform: translateY(0);
  z-index: 10;
}

/* アクティブタブの白色下線 */
.tab-container .nav-tab-btn.nav-tab-active::after {
  content: '';
  position: absolute;
  bottom: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 2px;
  background: white;
  border-radius: 1px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

/* 非アクティブタブの下線を追加 */
.tab-container .nav-tab-btn:not(.nav-tab-active)::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: #dee2e6;
  border-radius: 0 0 2px 2px;
}

/* 改行→brタグタブ（落ち着いた紫系） */
.tab-container .nav-tab-btn.nav-tab-brTag {
  background: linear-gradient(135deg, #6f4e7c 0%, #5a4a6a 100%);
  border-color: #4a3d5a;
  color: white;
  box-shadow: 0 2px 8px rgba(111, 78, 124, 0.3);
}

.tab-container .nav-tab-btn.nav-tab-brTag:hover {
  background: linear-gradient(135deg, #8b6f9e 0%, #6f4e7c 100%);
  box-shadow: 0 4px 12px rgba(111, 78, 124, 0.4);
}

/* 改行整理タブ（落ち着いたオレンジ系） */
.tab-container .nav-tab-btn.nav-tab-brRemove {
  background: linear-gradient(135deg, #ff9800 0%, #f57c00 100%);
  border-color: #ef6c00;
  color: white;
  box-shadow: 0 2px 8px rgba(255, 152, 0, 0.3);
}

.tab-container .nav-tab-btn.nav-tab-brRemove:hover {
  background: linear-gradient(135deg, #ffb74d 0%, #ff9800 100%);
  box-shadow: 0 4px 12px rgba(255, 152, 0, 0.4);
}

/* テキスト装飾タブ（落ち着いた青系） */
.tab-container .nav-tab-btn.nav-tab-decorationGUI {
  background: linear-gradient(135deg, #2196F3 0%, #1976D2 100%);
  border-color: #1565C0;
  color: white;
  box-shadow: 0 2px 8px rgba(33, 150, 243, 0.3);
}

.tab-container .nav-tab-btn.nav-tab-decorationGUI:hover {
  background: linear-gradient(135deg, #42A5F5 0%, #2196F3 100%);
  box-shadow: 0 4px 12px rgba(33, 150, 243, 0.4);
}

/* 装飾変換タブ（落ち着いたピンク系） */
.tab-container .nav-tab-btn.nav-tab-decorationTag {
  background: linear-gradient(135deg, #e91e63 0%, #c2185b 100%);
  border-color: #ad1457;
  color: white;
  box-shadow: 0 2px 8px rgba(233, 30, 99, 0.3);
}

.tab-container .nav-tab-btn.nav-tab-decorationTag:hover {
  background: linear-gradient(135deg, #f06292 0%, #e91e63 100%);
  box-shadow: 0 4px 12px rgba(233, 30, 99, 0.4);
}

/* ダウンロードタブ（落ち着いた青系） */
.tab-container .nav-tab-btn.nav-tab-download {
  background: linear-gradient(135deg, #1976D2 0%, #1565C0 100%);
  border-color: #0d47a1;
  color: white;
  box-shadow: 0 2px 8px rgba(25, 118, 210, 0.3);
}

.tab-container .nav-tab-btn.nav-tab-download:hover {
  background: linear-gradient(135deg, #2196F3 0%, #1976D2 100%);
  box-shadow: 0 4px 12px rgba(25, 118, 210, 0.4);
}