/**
 * Folder Assignment CSS
 * TOEIC Vocabulary List - UI v1
 *
 * フォルダ割り振りシステムのスタイル
 */

/* ==========================================
   CSS Variables - Folder Colors
   ========================================== */

:root {
  /* フォルダカラースキーム */
  --color-folder-1: #3b82f6;           /* 青 - Folder 1 */
  --color-folder-1-dark: #2563eb;      /* 青(濃) */
  --color-folder-1-bg: #dbeafe;        /* 青(背景) */

  --color-folder-2: #10b981;           /* 緑 - Folder 2 */
  --color-folder-2-dark: #059669;      /* 緑(濃) */
  --color-folder-2-bg: #d1fae5;        /* 緑(背景) */

  --color-folder-3: #f59e0b;           /* 黄 - Folder 3 */
  --color-folder-3-dark: #d97706;      /* 黄(濃) */
  --color-folder-3-bg: #fef3c7;        /* 黄(背景) */

  --color-folder-4: #8b5cf6;           /* 紫 - Folder 4 */
  --color-folder-4-dark: #7c3aed;      /* 紫(濃) */
  --color-folder-4-bg: #ede9fe;        /* 紫(背景) */

  --color-folder-5: #ef4444;           /* 赤 - Folder 5 */
  --color-folder-5-dark: #dc2626;      /* 赤(濃) */
  --color-folder-5-bg: #fee2e2;        /* 赤(背景) */
}

/* ダークモード対応 */
[data-theme="dark"] {
  --color-folder-1-bg: #1e3a8a;
  --color-folder-2-bg: #064e3b;
  --color-folder-3-bg: #78350f;
  --color-folder-4-bg: #5b21b6;
  --color-folder-5-bg: #7f1d1d;
}

/* ==========================================
   Folder Selector - ヘッダーのフォルダ選択
   ========================================== */

.folder-selector {
  /* Using card-unified class for base styles */
}

.folder-selector-buttons {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.folder-selector-btn {
  padding: 8px 16px;
  border: 2px solid var(--color-border, #e5e7eb);
  background-color: var(--color-bg-card, #ffffff);
  color: var(--color-text-secondary, #6b7280);
  border-radius: var(--radius-md, 8px);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast, 0.15s) ease;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 6px;
}

.folder-selector-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.folder-selector-btn:active {
  transform: translateY(0);
}

.folder-selector-btn.active {
  color: white;
  font-weight: 600;
}

/* 「すべて」ボタンのアクティブスタイル */
.folder-selector-btn[data-folder="all"].active {
  background-color: var(--color-primary, #3b82f6);
  border-color: var(--color-primary-dark, #2563eb);
}

/* 各フォルダボタンのホバーとアクティブスタイル */
.folder-selector-btn[data-folder="1"]:hover {
  border-color: var(--color-folder-1);
  color: var(--color-folder-1);
  background-color: var(--color-folder-1-bg);
}

.folder-selector-btn[data-folder="1"].active {
  background-color: var(--color-folder-1);
  border-color: var(--color-folder-1-dark);
}

.folder-selector-btn[data-folder="2"]:hover {
  border-color: var(--color-folder-2);
  color: var(--color-folder-2);
  background-color: var(--color-folder-2-bg);
}

.folder-selector-btn[data-folder="2"].active {
  background-color: var(--color-folder-2);
  border-color: var(--color-folder-2-dark);
}

.folder-selector-btn[data-folder="3"]:hover {
  border-color: var(--color-folder-3);
  color: var(--color-folder-3);
  background-color: var(--color-folder-3-bg);
}

.folder-selector-btn[data-folder="3"].active {
  background-color: var(--color-folder-3);
  border-color: var(--color-folder-3-dark);
}

.folder-selector-btn[data-folder="4"]:hover {
  border-color: var(--color-folder-4);
  color: var(--color-folder-4);
  background-color: var(--color-folder-4-bg);
}

.folder-selector-btn[data-folder="4"].active {
  background-color: var(--color-folder-4);
  border-color: var(--color-folder-4-dark);
}

.folder-selector-btn[data-folder="5"]:hover {
  border-color: var(--color-folder-5);
  color: var(--color-folder-5);
  background-color: var(--color-folder-5-bg);
}

.folder-selector-btn[data-folder="5"].active {
  background-color: var(--color-folder-5);
  border-color: var(--color-folder-5-dark);
}

/* フォルダアイコン */
.folder-icon {
  font-size: 16px;
}

/* フォルダクリアボタン */
.folder-clear-btn {
  padding: 6px 12px;
  border: 1px solid var(--color-border, #e5e7eb);
  background-color: var(--color-bg-card, #ffffff);
  color: var(--color-text-secondary, #6b7280);
  border-radius: var(--radius-sm, 6px);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast, 0.15s) ease;
  white-space: nowrap;
}

.folder-clear-btn:hover {
  border-color: #ef4444;
  color: #ef4444;
  background-color: #fee2e2;
}

.folder-clear-btn:active {
  transform: scale(0.95);
}

/* ==========================================
   Folder Buttons - 単語カードのボタン
   ========================================== */

.folder-buttons {
  display: flex;
  gap: 6px;
  margin-top: var(--spacing-xs, 8px);
  flex-wrap: wrap;
}

.folder-btn {
  width: 32px;
  height: 32px;
  border: 2px solid var(--color-border, #e5e7eb);
  background-color: var(--color-bg-card, #ffffff);
  color: var(--color-text-secondary, #6b7280);
  border-radius: var(--radius-sm, 6px);
  font-size: 14px;
  font-weight: bold;
  cursor: pointer;
  transition: all var(--transition-fast, 0.15s) ease;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
}

.folder-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.folder-btn:active {
  transform: translateY(0);
}

/* 各フォルダのアクティブスタイル */
.folder-btn[data-folder="1"].active {
  background-color: var(--color-folder-1);
  border-color: var(--color-folder-1-dark);
  color: white;
}

.folder-btn[data-folder="2"].active {
  background-color: var(--color-folder-2);
  border-color: var(--color-folder-2-dark);
  color: white;
}

.folder-btn[data-folder="3"].active {
  background-color: var(--color-folder-3);
  border-color: var(--color-folder-3-dark);
  color: white;
}

.folder-btn[data-folder="4"].active {
  background-color: var(--color-folder-4);
  border-color: var(--color-folder-4-dark);
  color: white;
}

.folder-btn[data-folder="5"].active {
  background-color: var(--color-folder-5);
  border-color: var(--color-folder-5-dark);
  color: white;
}

/* ==========================================
   Word Card Folder Indicators
   ========================================== */

/* 単語カードの上部にフォルダドットインジケーターを表示 */
.folder-indicators {
  display: flex;
  gap: 4px;
  margin-bottom: var(--spacing-xs, 8px);
}

.folder-indicator-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  transition: transform var(--transition-fast, 0.15s) ease;
}

.folder-indicator-dot:hover {
  transform: scale(1.3);
}

/* 各フォルダのドット色 */
.folder-indicator-dot[data-folder="1"] {
  background-color: var(--color-folder-1);
}

.folder-indicator-dot[data-folder="2"] {
  background-color: var(--color-folder-2);
}

.folder-indicator-dot[data-folder="3"] {
  background-color: var(--color-folder-3);
}

.folder-indicator-dot[data-folder="4"] {
  background-color: var(--color-folder-4);
}

.folder-indicator-dot[data-folder="5"] {
  background-color: var(--color-folder-5);
}

/* ==========================================
   Statistics - フォルダ統計表示
   ========================================== */

.folder-stats {
  display: flex;
  gap: var(--spacing-sm, 12px);
  flex-wrap: wrap;
  align-items: center;
}

.folder-stat-item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
}

.folder-stat-icon {
  font-size: 16px;
}

.folder-stat-icon[data-folder="1"] {
  color: var(--color-folder-1);
}

.folder-stat-icon[data-folder="2"] {
  color: var(--color-folder-2);
}

.folder-stat-icon[data-folder="3"] {
  color: var(--color-folder-3);
}

.folder-stat-icon[data-folder="4"] {
  color: var(--color-folder-4);
}

.folder-stat-icon[data-folder="5"] {
  color: var(--color-folder-5);
}

.folder-stat-count {
  font-weight: var(--font-weight-bold, 600);
  color: var(--color-text-primary);
}

/* ==========================================
   Responsive Design
   ========================================== */

@media (max-width: 768px) {
  .folder-selector {
    flex-direction: column;
    align-items: flex-start;
  }

  .folder-selector-buttons {
    width: 100%;
  }

  .folder-selector-btn {
    flex: 1;
    min-width: 0;
    font-size: 13px;
    padding: 6px 12px;
    justify-content: center;
  }

  .folder-buttons {
    gap: 4px;
  }

  .folder-btn {
    width: 28px;
    height: 28px;
    font-size: 12px;
  }

  .folder-stats {
    gap: var(--spacing-xs, 8px);
  }

  .folder-stat-item {
    font-size: 12px;
  }
}

@media (max-width: 480px) {
  .folder-selector-btn {
    font-size: 12px;
    padding: 5px 10px;
  }

  .folder-btn {
    width: 26px;
    height: 26px;
    font-size: 11px;
  }

  .folder-indicator-dot {
    width: 6px;
    height: 6px;
  }
}

/* ==========================================
   Animations
   ========================================== */

@keyframes folderPulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1);
  }
}

.folder-btn.just-added {
  animation: folderPulse 0.3s ease;
}

.folder-indicator-dot.just-added {
  animation: folderPulse 0.3s ease;
}

/* ==========================================
   Accessibility
   ========================================== */

/* キーボードフォーカスの強調 */
.folder-selector-btn:focus-visible,
.folder-btn:focus-visible {
  outline: 3px solid var(--color-primary-light, #eff6ff);
  outline-offset: 2px;
}

/* 動きを減らす設定 */
@media (prefers-reduced-motion: reduce) {
  .folder-selector-btn,
  .folder-btn,
  .folder-indicator-dot {
    transition: none;
    animation: none;
  }

  .folder-btn:hover,
  .folder-selector-btn:hover {
    transform: none;
  }
}

/* ==========================================
   Responsive Design
   ========================================== */

@media (max-width: 768px) {
  .folder-selector {
    flex-direction: column;
    align-items: flex-start;
  }

  .folder-selector-buttons {
    width: 100%;
  }

  .folder-selector-btn {
    flex: 0 1 auto;
    font-size: 13px;
    padding: 6px 12px;
  }

  .folder-buttons {
    gap: 3px;
  }

  .folder-btn {
    width: 28px;
    height: 28px;
    font-size: 11px;
  }
}

@media (max-width: 480px) {
  .folder-selector-btn {
    font-size: 11px;
    padding: 4px 8px;
  }

  .folder-btn {
    width: 26px;
    height: 26px;
    font-size: 10px;
  }
}