* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* ===== 色系主題 ===== */
/* 淺色主題（預設） */
:root {
  --bg-primary: #f0f2f5;
  --bg-card: #ffffff;
  --bg-header: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --bg-input: #f8f9fa;
  --text-primary: #333333;
  --text-secondary: #666666;
  --text-muted: #999999;
  --border-color: #e9ecef;
  --accent-color: #667eea;
  --accent-hover: #5a6fd6;
  --danger-color: #dc3545;
  --success-color: #28a745;
  --shadow: 0 8px 30px rgba(0,0,0,0.08);
  --shadow-hover: 0 12px 40px rgba(0,0,0,0.12);
}

/* 深色主題 */
[data-theme="dark"] {
  --bg-primary: #1a1a2e;
  --bg-card: #16213e;
  --bg-header: linear-gradient(135deg, #0f3460 0%, #533483 100%);
  --bg-input: #1a1a2e;
  --text-primary: #eaeaea;
  --text-secondary: #b0b0b0;
  --text-muted: #707070;
  --border-color: #2a2a4a;
  --accent-color: #e94560;
  --accent-hover: #d63851;
  --danger-color: #e94560;
  --success-color: #4ecca3;
  --shadow: 0 8px 30px rgba(0,0,0,0.3);
  --shadow-hover: 0 12px 40px rgba(0,0,0,0.4);
}

/* 粉色主題 */
[data-theme="pink"] {
  --bg-primary: #fff0f5;
  --bg-card: #ffffff;
  --bg-header: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --bg-input: #fff5f8;
  --text-primary: #4a4a4a;
  --text-secondary: #7a7a7a;
  --text-muted: #aaaaaa;
  --border-color: #fce4ec;
  --accent-color: #f5576c;
  --accent-hover: #e4455a;
  --danger-color: #f5576c;
  --success-color: #4caf50;
  --shadow: 0 8px 30px rgba(245,87,108,0.1);
  --shadow-hover: 0 12px 40px rgba(245,87,108,0.15);
}

/* 淺棕色主題 */
[data-theme="brown"] {
  --bg-primary: #f5f0e8;
  --bg-card: #fffef9;
  --bg-header: linear-gradient(135deg, #8d6e63 0%, #a1887f 100%);
  --bg-input: #faf7f2;
  --text-primary: #4e342e;
  --text-secondary: #795548;
  --text-muted: #a1887f;
  --border-color: #d7ccc8;
  --accent-color: #8d6e63;
  --accent-hover: #795548;
  --danger-color: #c62828;
  --success-color: #558b2f;
  --shadow: 0 8px 30px rgba(141,110,99,0.1);
  --shadow-hover: 0 12px 40px rgba(141,110,99,0.15);
}

body {
  font-family: 'Microsoft JhengHei', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--bg-primary);
  min-height: 100vh;
  padding: 20px;
  transition: background 0.3s, color 0.3s;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

/* ===== 頂部工具列 ===== */
.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 16px;
}

.header {
  text-align: left;
}

.header-title {
  font-size: 1.8rem;
  color: var(--text-primary);
  font-weight: 800;
  margin: 0;
  line-height: 1.2;
}

.header-subtitle {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin: 4px 0 0 0;
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.header-buttons {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* 電腦與行動裝置按鈕可見度控制 */
.desktop-only {
  display: inline-block !important;
}
.mobile-only {
  display: none !important;
}

.header-title-container {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 管理後台按鈕與教師分享頂部按鈕 */
.admin-top-btn,
.teacher-share-top-btn {
  flex: none !important;
  max-width: none !important;
  padding: 8px 14px !important;
  font-size: 13px !important;
  border: 1.5px solid var(--accent-color) !important;
  background: transparent !important;
  color: var(--accent-color) !important;
  border-radius: 20px !important;
  white-space: nowrap;
  font-weight: 700;
  transition: all 0.25s ease;
}
.admin-top-btn:hover,
.teacher-share-top-btn:hover {
  background: var(--accent-color) !important;
  color: white !important;
  box-shadow: 0 3px 10px rgba(102,126,234,0.35);
}
.admin-top-btn.active,
.teacher-share-top-btn.active {
  background: var(--accent-color) !important;
  color: white !important;
  box-shadow: 0 3px 10px rgba(102,126,234,0.35);
}

.status-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.online-count {
  font-size: 13px;
  font-weight: bold;
  color: var(--danger-color);
  white-space: nowrap;
}

/* 連線狀態 */
.connection-status {
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: bold;
}

.connection-status.connected {
  background: var(--success-color);
  color: white;
}

.connection-status.disconnected {
  background: var(--danger-color);
  color: white;
}

/* 色系切換按鈕 */
.theme-switcher {
  display: flex;
  gap: 6px;
}

.theme-btn {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 3px solid transparent;
  cursor: pointer;
  transition: transform 0.2s, border-color 0.2s;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}

.theme-btn:hover {
  transform: scale(1.15);
}

.theme-btn.active {
  border-color: var(--text-primary);
  transform: scale(1.1);
}

.theme-btn.light { background: linear-gradient(135deg, #667eea, #764ba2); }
.theme-btn.dark { background: linear-gradient(135deg, #0f3460, #533483); }
.theme-btn.pink { background: linear-gradient(135deg, #f093fb, #f5576c); }
.theme-btn.brown { background: linear-gradient(135deg, #8d6e63, #a1887f); }

/* 重設按鈕 */
.reset-btn {
  padding: 8px 16px;
  background: var(--danger-color);
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: bold;
  font-size: 13px;
  transition: opacity 0.2s;
  display: flex;
  align-items: center;
  gap: 5px;
}

.reset-btn:hover {
  opacity: 0.85;
}

/* ===== 主要內容 ===== */
.main-content {
  display: block;
}

/* ===== 卡片樣式 ===== */
.panel-card {
  background: var(--bg-card);
  border-radius: 16px;
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: background 0.3s, box-shadow 0.3s;
  display: none; /* 預設隱藏 */
}

.panel-card.active {
  display: block; /* 被選中時顯示 */
}

.panel-card:hover {
  box-shadow: var(--shadow-hover);
}

.panel-header {
  padding: 14px 18px;
  background: var(--bg-header);
  color: white;
  font-weight: bold;
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: default; /* 移除收合手勢指標 */
  user-select: none;
  font-size: 1rem;
}

.panel-header .icon {
  font-size: 1.1rem;
}

.panel-header .title {
  flex: 1;
}

.panel-header .collapse-icon {
  transition: transform 0.3s;
  font-size: 0.7rem;
  opacity: 0.8;
}

.panel-card.collapsed .panel-header .collapse-icon {
  transform: rotate(-90deg);
}

.panel-body {
  padding: 16px;
  overflow-y: auto;
  transition: max-height 0.3s ease, padding 0.3s ease, opacity 0.3s ease;
}

.panel-card.collapsed .panel-body {
  max-height: 0;
  padding: 0 16px;
  opacity: 0;
  overflow: hidden;
}

/* ===== 問題區域 ===== */
.question-input-group {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}

.question-input {
  flex: 1;
  min-width: 0;
  padding: 10px 14px;
  border: 2px solid var(--border-color);
  border-radius: 10px;
  font-size: 14px;
  outline: none;
  background: var(--bg-input);
  color: var(--text-primary);
  transition: border-color 0.2s, background 0.3s;
}

.question-input:focus {
  border-color: var(--accent-color);
}

.ask-btn {
  padding: 10px 18px;
  background: var(--accent-color);
  color: white;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-weight: bold;
  font-size: 14px;
  transition: background 0.2s;
  white-space: nowrap;
}

.ask-btn:hover {
  background: var(--accent-hover);
}

.question-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(280px, 100%), 1fr));
  gap: 14px;
  margin-top: 16px;
}

.question-list li:only-child {
  grid-column: 1 / -1;
  text-align: center;
}

.question-item {
  padding: 12px;
  background: var(--bg-input);
  border-radius: 10px;
  margin-bottom: 8px;
  border-left: 4px solid var(--accent-color);
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
}

.question-item:hover {
  transform: translateX(4px);
}

[data-theme="dark"] .question-item:hover { background: #1e2a4a; }
[data-theme="pink"] .question-item:hover { background: #fff0f3; }
[data-theme="brown"] .question-item:hover { background: #f0ebe3; }

.question-item .user {
  font-weight: bold;
  color: var(--accent-color);
  font-size: 11px;
  margin-bottom: 4px;
}

.question-item .text {
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.4;
}

.linkified {
  color: var(--accent-color);
  text-decoration: underline;
  word-break: break-all;
  font-weight: 500;
  transition: color 0.2s ease;
}

.linkified:hover {
  color: var(--accent-hover);
}


/* ===== 測驗區域 ===== */
.quiz-controls {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.quiz-input {
  width: 100%;
  padding: 10px 14px;
  border: 2px solid var(--border-color);
  border-radius: 10px;
  font-size: 14px;
  outline: none;
  background: var(--bg-input);
  color: var(--text-primary);
  transition: border-color 0.2s, background 0.3s;
}

.quiz-input:focus {
  border-color: var(--accent-color);
}

/* 預設選項 */
.preset-options {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.preset-label {
  font-size: 12px;
  color: var(--text-muted);
}

.preset-btns {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.preset-btn {
  padding: 5px 10px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  color: var(--text-primary);
}

.preset-btn:hover {
  border-color: var(--accent-color);
  background: var(--bg-card);
}

.options-container {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.option-input {
  display: flex;
  align-items: center;
  gap: 8px;
}

.option-label {
  width: 26px;
  height: 26px;
  background: var(--accent-color);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 12px;
  flex-shrink: 0;
}

.option-input input {
  flex: 1;
  padding: 8px 12px;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  font-size: 13px;
  outline: none;
  background: var(--bg-input);
  color: var(--text-primary);
  transition: border-color 0.2s, background 0.3s;
}

.option-input input:focus {
  border-color: var(--accent-color);
}

.remove-option-btn {
  width: 24px;
  height: 24px;
  border: none;
  background: var(--danger-color);
  color: white;
  border-radius: 50%;
  cursor: pointer;
  font-size: 11px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: opacity 0.2s;
}

.remove-option-btn:hover {
  opacity: 0.8;
}

.add-option-btn {
  width: 100%;
  padding: 10px;
  background: var(--bg-input);
  color: var(--text-secondary);
  border: 2px dashed var(--border-color);
  border-radius: 10px;
  cursor: pointer;
  font-size: 13px;
  font-weight: bold;
  transition: border-color 0.2s, color 0.2s;
}

.add-option-btn:hover {
  border-color: var(--accent-color);
  color: var(--accent-color);
}

.start-quiz-btn, .end-quiz-btn {
  width: 100%;
  padding: 12px;
  background: var(--success-color);
  color: white;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-weight: bold;
  font-size: 14px;
  transition: opacity 0.2s;
}

.end-quiz-btn {
  background: var(--danger-color);
}

.start-quiz-btn:hover, .end-quiz-btn:hover {
  opacity: 0.85;
}

.quiz-status {
  padding: 12px;
  background: var(--bg-input);
  border-radius: 10px;
  text-align: center;
  color: var(--text-primary);
  font-weight: bold;
  border: 2px solid var(--border-color);
}

.quiz-results {
  margin-top: 12px;
}

.result-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.result-label {
  width: 28px;
  font-weight: bold;
  color: var(--accent-color);
  font-size: 13px;
}

.result-progress {
  flex: 1;
  height: 24px;
  background: var(--bg-input);
  border-radius: 12px;
  overflow: hidden;
}

.result-fill {
  height: 100%;
  background: var(--bg-header);
  transition: width 0.3s;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 8px;
  color: white;
  font-size: 11px;
  font-weight: bold;
  min-width: 30px;
}

/* ===== 圖片上傳區域 ===== */
.upload-zone {
  border: 2px dashed var(--border-color);
  border-radius: 10px;
  padding: 12px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  background: var(--bg-input);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.upload-zone:hover {
  border-color: var(--accent-color);
}

.upload-zone.dragover {
  border-color: var(--accent-color);
  background: var(--bg-primary);
}

.upload-icon {
  font-size: 24px;
  margin-bottom: 0;
}

.upload-text {
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.2;
}

#imageInput {
  display: none;
}

.image-preview {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.preview-item {
  position: relative;
  cursor: pointer;
  transition: transform 0.2s;
}

.preview-item:hover {
  transform: scale(1.05);
}

.preview-item img {
  width: 140px;
  height: 140px;
  object-fit: cover;
  border-radius: 10px;
  border: 2px solid var(--border-color);
}

.preview-item:hover img {
  border-color: var(--accent-color);
}

/* ===== 彈出視窗 ===== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--bg-card);
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  max-width: 600px;
  width: 90%;
  max-height: 85vh;
  overflow: hidden;
  transform: scale(0.85);
  transition: transform 0.3s, background 0.3s;
}

.modal-overlay.active .modal-content {
  transform: scale(1);
}

.modal-header {
  padding: 14px 18px;
  background: var(--bg-header);
  color: white;
  font-weight: bold;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1rem;
}

.modal-close {
  width: 28px;
  height: 28px;
  border: none;
  background: rgba(255, 255, 255, 0.2);
  color: white;
  border-radius: 50%;
  cursor: pointer;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.modal-close:hover {
  background: rgba(255, 255, 255, 0.35);
}

.modal-body {
  padding: 20px;
  max-height: calc(85vh - 50px);
  overflow-y: auto;
}

/* 問題彈出視窗 */
.question-modal .question-user {
  font-size: 13px;
  color: var(--accent-color);
  margin-bottom: 10px;
  font-weight: bold;
}

.question-modal .question-text {
  font-size: 18px;
  line-height: 1.6;
  color: var(--text-primary);
  white-space: pre-wrap;
  word-break: break-word;
}

/* 圖片彈出視窗 */
.image-modal .modal-content {
  max-width: 90vw;
}

.image-modal .modal-body {
  padding: 0;
  text-align: center;
  background: #000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.image-modal .image-zoom-container {
  width: 100%;
  height: calc(85vh - 60px);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  touch-action: none;
  cursor: grab;
  position: relative;
}

.image-modal .image-zoom-container:active {
  cursor: grabbing;
}

#imageCanvasWrapper {
  display: inline-block;
  position: relative;
  transition: transform 0.1s ease-out;
}

.image-modal .modal-image {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  display: block;
  user-select: none;
  -webkit-user-drag: none;
}

.image-modal .zoom-controls {
  position: absolute;
  bottom: 160px;
  right: 15px;
  display: flex;
  flex-direction: row;
  align-items: flex-end;
  gap: 8px;
  z-index: 10;
}

.image-modal .zoom-buttons-container {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: rgba(0, 0, 0, 0.6);
  padding: 6px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(5px);
  align-items: center;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.image-modal .draw-settings-panel {
  display: none;
  flex-direction: column;
  gap: 8px;
  background: rgba(0, 0, 0, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 10px;
  border-radius: 8px;
  align-items: center;
  backdrop-filter: blur(5px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.5);
}

.image-modal .zoom-btn {
  width: 36px;
  height: 36px;
  border: none;
  background: rgba(255,255,255,0.9);
  border-radius: 8px;
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, color 0.2s;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  color: #333;
}

.image-modal .zoom-btn:hover {
  background: white;
}

.image-modal .zoom-btn.active {
  background: var(--accent-color);
  color: white;
}

/* Color Dots inside modal */
.image-modal .color-dot {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid white;
  box-shadow: 0 0 0 1px rgba(255,255,255,0.4);
  cursor: pointer;
  padding: 0;
  transition: transform 0.1s;
}

.image-modal .color-dot:hover {
  transform: scale(1.15);
}

.image-modal .color-dot.active {
  box-shadow: 0 0 0 2px var(--accent-color);
}

.image-modal .zoom-info {
  position: absolute;
  bottom: 80px;
  left: 15px;
  background: rgba(0,0,0,0.6);
  color: white;
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 12px;
  z-index: 10;
}

.image-modal .image-info {
  padding: 14px 18px;
  background: var(--bg-card);
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.image-modal .image-user {
  color: var(--accent-color);
  font-weight: bold;
  font-size: 13px;
}

.image-modal .image-filename {
  color: var(--text-muted);
  font-size: 12px;
}

.image-modal .download-btn {
  padding: 8px 16px;
  background: var(--accent-color);
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: bold;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: background 0.2s;
  font-size: 13px;
}

.image-modal .download-btn:hover {
  background: var(--accent-hover);
}

/* ===== 確認彈出視窗 ===== */
.confirm-modal .modal-content {
  max-width: 320px;
  border-radius: 20px;
  border: none;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
}

.confirm-modal .modal-body {
  text-align: center;
  padding: 24px 20px;
}

.confirm-modal .confirm-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  width: 100%;
}

.confirm-modal .confirm-btn {
  flex: 1;
  padding: 12px 20px;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  font-weight: bold;
  font-size: 15px;
  transition: opacity 0.2s, background-color 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  outline: none;
}

.confirm-modal .confirm-btn:hover {
  opacity: 0.9;
}

.confirm-modal .confirm-btn.cancel {
  background: #e8eaed;
  color: #3c4043;
}

[data-theme="dark"] .confirm-modal .confirm-btn.cancel {
  background: #2a2a4a;
  color: #b0b0b0;
}

.confirm-modal .confirm-btn.confirm {
  background: var(--accent-color);
  color: white;
}

.confirm-modal .confirm-btn.confirm:hover {
  background: var(--accent-hover);
}

/* 密碼輸入框特別設計 */
.confirm-modal .question-input {
  width: 100% !important;
  text-align: center;
  font-size: 18px !important;
  letter-spacing: 4px;
  margin-bottom: 20px;
  border: 2px solid var(--accent-color) !important;
  border-radius: 12px !important;
  padding: 12px 14px !important;
  background: var(--bg-input) !important;
  color: var(--text-primary) !important;
  outline: none;
  transition: border-color 0.2s;
}

.confirm-modal .question-input:focus {
  border-color: var(--accent-hover) !important;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.25);
}

[data-theme="dark"] .confirm-modal .question-input:focus {
  box-shadow: 0 0 0 3px rgba(233, 69, 96, 0.25);
}

/* ===== RWD ===== */
@media (max-width: 900px) {
  .main-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  /* top-bar layout */
  .top-bar {
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
    margin-bottom: 16px;
  }
  
  .header {
    text-align: center;
  }
  
  .header-title-container {
    display: block !important;
    text-align: center;
  }
  
  .desktop-only {
    display: none !important;
  }
  
  .mobile-only {
    display: inline-block !important;
  }
  
  .header-title {
    font-size: 1.5rem;
  }
  
  .header-subtitle {
    font-size: 0.85rem;
  }
  
  .top-actions {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
    width: 100%;
  }
  
  .status-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 0 4px;
    box-sizing: border-box;
  }
  
  .header-buttons {
    display: flex;
    width: 100%;
    gap: 10px;
    box-sizing: border-box;
  }
  
  .header-buttons .menu-tab {
    flex: 1;
    justify-content: center;
    padding: 10px 14px !important;
    font-size: 13px !important;
    border-radius: 20px !important;
    white-space: nowrap;
  }
  
  .theme-switcher {
    display: none !important;
  }

  /* 功能選單水平滾動 */
  .function-menu {
    display: flex;
    overflow-x: auto;
    overflow-y: hidden;
    white-space: nowrap;
    justify-content: flex-start !important;
    gap: 8px !important;
    padding: 8px !important;
    border-radius: 12px !important;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none; /* Firefox */
  }
  
  .function-menu::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Opera */
  }
  
  .function-menu .menu-tab {
    flex: 0 0 auto !important;
    width: auto !important;
    max-width: none !important;
    padding: 10px 16px !important;
    font-size: 14px !important;
    white-space: nowrap !important;
  }
}

@media (max-width: 480px) {
  body {
    padding: 12px;
  }
  
  .header-title {
    font-size: 1.3rem;
  }
  
  .panel-header {
    padding: 12px 14px;
    font-size: 0.9rem;
  }
  
  .panel-body {
    padding: 12px;
  }
  
  .theme-btn {
    width: 24px;
    height: 24px;
  }
  
  .modal-content {
    max-width: 95vw !important;
  }
  
  #focusGameOverlayContent {
    padding: 16px 12px !important;
  }
  
  .character-crossword-container {
    grid-template-columns: repeat(3, 64px) !important;
    grid-template-rows: repeat(3, 64px) !important;
    gap: 8px !important;
  }
  
  .character-crossword-cell {
    font-size: 24px !important;
  }
  
  .character-crossword-container .chinese-writing-grid {
    width: 64px !important;
    height: 64px !important;
  }
  
  .character-crossword-container .char-test-input-box {
    font-size: 32px !important;
  }
  
  .image-info {
    padding: 15px 15px 25px 15px !important;
  }
}

/* ===== 功能選單與滾動導覽包裝層 ===== */
.function-menu-wrapper {
  position: relative;
  width: 100%;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
}

.function-menu {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  gap: 10px;
  width: 100%;
  background: var(--bg-card);
  padding: 10px;
  border-radius: 14px;
  box-shadow: var(--shadow);
  overflow-x: auto;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none; /* Firefox 隱藏粗糙滾動條 */
}

.function-menu::-webkit-scrollbar {
  display: none; /* Chrome / Safari / Edge 隱藏滾動條 */
}

.menu-tab {
  flex-shrink: 0 !important;
  white-space: nowrap !important;
  padding: 11px 18px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: bold;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

/* 左右滑動導覽箭頭按鈕 (.nav-scroll-btn) */
.nav-scroll-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 15;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: bold;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.2s ease, background-color 0.2s ease, color 0.2s ease;
  user-select: none;
}

.nav-scroll-btn.visible {
  opacity: 1;
  pointer-events: auto;
}

.nav-scroll-btn:hover {
  background: var(--accent-color);
  color: #ffffff;
  border-color: var(--accent-color);
  transform: translateY(-50%) scale(1.1);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

.nav-scroll-btn:active {
  transform: translateY(-50%) scale(0.95);
}

.left-scroll-btn {
  left: -12px;
}

.right-scroll-btn {
  right: -12px;
}

.menu-tab:hover {
  background: var(--bg-input);
  color: var(--accent-color);
}

.menu-tab.active {
  background: var(--accent-color);
  color: white;
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

[data-theme="dark"] .menu-tab.active {
  box-shadow: 0 4px 12px rgba(233, 69, 96, 0.4);
}

[data-theme="pink"] .menu-tab.active {
  box-shadow: 0 4px 12px rgba(245, 87, 108, 0.3);
}

[data-theme="brown"] .menu-tab.active {
  box-shadow: 0 4px 12px rgba(141, 110, 99, 0.3);
}

/* 隱藏區塊收合功能圖示 */
.panel-header .collapse-icon {
  display: none !important;
}

/* ===== 提問卡片化樣式 ===== */
.question-item.card-style {
  padding: 16px;
  background: var(--bg-card);
  border-radius: 12px;
  margin-bottom: 0;
  border-left: 4px solid var(--accent-color);
  border-top: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
  cursor: pointer;
  transition: all 0.2s ease;
  display: block;
}

.question-item.card-style:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.question-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  font-size: 13px;
}

.question-card-header .header-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.question-card-header .question-badge {
  background: var(--bg-primary);
  color: var(--accent-color);
  padding: 2px 8px;
  border-radius: 20px;
  font-weight: bold;
  font-size: 11px;
}

.question-card-header .question-badge.admin-badge {
  background: #fff0f1;
  color: var(--danger-color);
}

[data-theme="dark"] .question-card-header .question-badge.admin-badge {
  background: #3a1c22;
}

.question-card-header .user {
  font-weight: bold;
  color: var(--text-secondary);
}

.question-card-header .time {
  color: var(--text-muted);
  font-size: 11px;
}

.question-item.card-style .text {
  font-size: 15px;
  line-height: 1.5;
  color: var(--text-primary);
  word-break: break-word;
  white-space: pre-wrap;
}

/* 管理員卡片特別處理 */
.question-item.card-style.admin-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ===== 選擇題答題選項樣式 ===== */
.answer-options-container {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 24px;
  margin-bottom: 24px;
  justify-content: center;
}

.answer-option {
  padding: 14px 36px;
  font-size: 18px;
  font-weight: bold;
  background: var(--accent-color);
  color: white;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
}

.answer-option:hover {
  opacity: 0.9;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(102, 126, 234, 0.25);
}

[data-theme="dark"] .answer-option:hover {
  box-shadow: 0 6px 16px rgba(233, 69, 96, 0.3);
}

[data-theme="pink"] .answer-option:hover {
  box-shadow: 0 6px 16px rgba(245, 87, 108, 0.25);
}

[data-theme="brown"] .answer-option:hover {
  box-shadow: 0 6px 16px rgba(141, 110, 99, 0.25);
}

/* ===== 教師建置指南樣式 ===== */
.guide-header {
  text-align: center;
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 2px dashed var(--border-color);
}
.guide-header h1 {
  font-size: 1.8rem;
  color: var(--accent-color);
  margin-bottom: 8px;
  font-weight: 800;
}
.guide-header p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}
.step-card {
  background: var(--bg-input);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 20px;
  border-left: 5px solid var(--accent-color);
}
.step-title {
  font-size: 1.1rem;
  font-weight: bold;
  color: var(--text-primary);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.step-num {
  background: var(--accent-color);
  color: white;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: bold;
}
.step-card ol {
  padding-left: 20px;
  color: var(--text-secondary);
  line-height: 1.6;
}
.step-card li {
  margin-bottom: 8px;
}
.step-img-box {
  margin: 16px 0 24px 0;
  text-align: center;
}
.step-img,
#panel-guide img {
  max-width: 100% !important;
  width: auto !important;
  height: auto !important;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 15px rgba(0,0,0,0.08);
  display: inline-block;
  margin: 0 auto;
}
.tool-box {
  background: var(--bg-card);
  border: 2px solid var(--accent-color);
  border-radius: 16px;
  padding: 24px;
  margin: 30px 0;
  box-shadow: 0 8px 24px rgba(102, 126, 234, 0.08);
}
.tool-title {
  font-size: 1.2rem;
  font-weight: bold;
  color: var(--accent-color);
  margin-bottom: 16px;
  text-align: center;
}
.generator-group {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
}
.generator-input {
  flex: 1;
  padding: 12px 16px;
  border: 2px solid var(--border-color);
  border-radius: 10px;
  font-size: 14px;
  outline: none;
  background: var(--bg-input);
  color: var(--text-primary);
  transition: border-color 0.2s;
}
.generator-input:focus {
  border-color: var(--accent-color);
}
.generator-btn {
  padding: 12px 24px;
  background: var(--accent-color);
  color: white;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-weight: bold;
  font-size: 15px;
  transition: background 0.2s;
  white-space: nowrap;
}
.generator-btn:hover {
  background: var(--accent-hover);
}
.result-group {
  display: none;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
}
.result-item {
  margin-bottom: 16px;
}
.result-label {
  font-weight: bold;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 6px;
  display: block;
}
.result-field {
  display: flex;
  gap: 8px;
}
.result-url {
  flex: 1;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 13px;
  color: var(--text-primary);
  outline: none;
}
.copy-btn {
  padding: 10px 16px;
  background: #e8eaed;
  color: #3c4043;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: bold;
  font-size: 13px;
  transition: background 0.2s;
}
.copy-btn:hover {
  background: #dcdfe3;
}
[data-theme="dark"] .copy-btn {
  background: #2a2a4a;
  color: #b0b0b0;
}
[data-theme="dark"] .copy-btn:hover {
  background: #33335c;
}
.alert-tip {
  background: rgba(102, 126, 234, 0.08);
  border-left: 4px solid var(--accent-color);
  color: var(--text-primary);
  padding: 12px 16px;
  border-radius: 0 8px 8px 0;
  font-size: 13px;
  line-height: 1.5;
  margin-top: 12px;
}

/* ===== 懸浮倒數計時器 ===== */
.floating-timer {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1000;
  background: var(--bg-card);
  border-radius: 20px;
  box-shadow: 0 15px 50px rgba(0,0,0,0.2);
  border: 1px solid var(--border-color);
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  backdrop-filter: blur(12px);
}

[data-theme="dark"] .floating-timer {
  box-shadow: 0 15px 50px rgba(0,0,0,0.45);
}

.timer-expanded-content {
  width: 380px;
  padding: 24px;
}

.timer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
}

.timer-drag-handle {
  font-size: 14px;
  font-weight: bold;
  color: var(--text-secondary);
  cursor: move;
  user-select: none;
}

.local-style-select {
  font-size: 12px;
  padding: 4px 8px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  color: var(--text-primary);
  outline: none;
}

.timer-min-btn {
  background: none;
  border: none;
  font-size: 18px;
  font-weight: bold;
  cursor: pointer;
  color: var(--text-secondary);
  line-height: 1;
  padding: 2px 8px;
  border-radius: 4px;
}
.timer-min-btn:hover {
  background: var(--border-color);
}

.timer-body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 110px;
}

/* 1. 翻頁風格 (Flip Style) */
.flip-style {
  display: flex;
  align-items: center;
  gap: 10px;
}

.flip-unit {
  position: relative;
  width: 65px;
  height: 90px;
  background: #1e1e24;
  color: #fff;
  border-radius: 12px;
  font-size: 60px;
  font-weight: bold;
  text-align: center;
  line-height: 90px;
  box-shadow: 0 6px 12px rgba(0,0,0,0.3);
  font-family: 'Courier New', monospace;
  overflow: hidden;
}

.flip-unit::after {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 100%;
  height: 1px;
  background: rgba(0, 0, 0, 0.4);
  z-index: 2;
}

.flip-unit .digit {
  display: block;
  width: 100%;
  height: 100%;
}

@keyframes flipAnim {
  0% {
    transform: rotateX(0deg);
  }
  50% {
    transform: rotateX(-90deg);
    opacity: 0.3;
  }
  100% {
    transform: rotateX(0deg);
  }
}

.flip-unit.flipping .digit {
  animation: flipAnim 0.3s ease-in-out;
}

.flip-colon {
  font-size: 56px;
  font-weight: bold;
  color: var(--text-primary);
  animation: blinkColon 1s infinite;
}

@keyframes blinkColon {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* 2. LED 數位風格 (Digital Style) */
.digital-style {
  width: 100%;
}

.led-display {
  font-family: 'Courier New', Courier, monospace;
  font-size: 56px;
  color: #ff3b30;
  background: #000;
  padding: 16px 24px;
  border-radius: 12px;
  text-shadow: 0 0 15px #ff3b30, 0 0 25px #ff3b30;
  letter-spacing: 4px;
  text-align: center;
  box-shadow: inset 0 0 15px rgba(0,0,0,0.8);
  border: 2px solid #222;
}

/* 3. 簡約圓環風格 (Ring Style) */
.ring-style {
  position: relative;
  width: 180px;
  height: 180px;
}

.ring-svg {
  width: 180px;
  height: 180px;
  transform: rotate(-90deg);
}

.ring-bg {
  fill: none;
  stroke: var(--border-color);
  stroke-width: 8;
}

.ring-fg {
  fill: none;
  stroke: var(--accent-color);
  stroke-width: 8;
  stroke-linecap: round;
  stroke-dasharray: 251.32; /* 2 * PI * r = 2 * 3.14159 * 40 = 251.32 */
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 0.3s linear;
}

.ring-text {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  font-weight: bold;
  color: var(--text-primary);
  font-family: monospace;
}

/* 最小化狀態樣式 */
.timer-minimized-content {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px 16px;
  background: var(--accent-color);
  color: white;
  border-radius: 30px;
  font-weight: bold;
  font-size: 14px;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(0,0,0,0.2);
  transition: transform 0.2s;
  user-select: none;
}

.timer-minimized-content:hover {
  transform: scale(1.05);
  background: var(--accent-hover);
}

/* ===== 心情符號回饋 (Reactions) ===== */
.reactions-bar {
  display: flex;
  gap: 10px;
  margin-top: 10px;
  align-items: center;
}

.reaction-btn {
  display: inline-flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  gap: 4px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 4px 10px;
  cursor: pointer;
  transition: transform 0.2s, background 0.2s, border-color 0.2s;
  user-select: none;
  min-width: 42px;
}

.reaction-btn:hover {
  transform: translateY(-2px);
  background: rgba(0,0,0,0.02);
  border-color: var(--accent-color);
}

.reaction-btn:active {
  transform: translateY(0) scale(0.95);
}

.reaction-btn .reaction-count {
  font-size: 11px;
  font-weight: bold;
  color: var(--text-secondary);
  line-height: 1;
}

.reaction-btn .reaction-emoji {
  font-size: 13px;
}

/* ===== 群組資料夾 (Group Folders) ===== */
.folder-card {
  border-left: 5px solid var(--accent-color) !important;
  margin-bottom: 12px;
  padding: 12px 16px;
  border-radius: 12px;
  background: var(--bg-card);
  box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

.folder-card-header {
  user-select: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: bold;
}

.folder-card-header:hover {
  opacity: 0.85;
}

.folder-toggle-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
  font-weight: bold;
  transition: background 0.2s;
}

.folder-toggle-btn:hover {
  background: rgba(0,0,0,0.05);
  color: var(--text-primary);
}

.folder-image-card {
  width: 100%;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 14px;
  margin-bottom: 14px;
  background: var(--bg-card);
  box-shadow: 0 4px 12px rgba(0,0,0,0.04);
}

/* Select Folder dropdown inside admin list */
.folder-select {
  padding: 4px 8px;
  font-size: 12px;
  border-radius: 6px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  cursor: pointer;
  outline: none;
  transition: border-color 0.2s;
}

.folder-select:hover {
  border-color: var(--accent-color);
}

/* In-viewport placement for YouTube player to bypass browser autoplay throttling */
#canonPlayer {
  position: fixed !important;
  right: 0 !important;
  bottom: 0 !important;
  width: 200px !important;
  height: 200px !important;
  opacity: 0.001 !important;
  pointer-events: none !important;
  z-index: -1 !important;
}

/* Modal Navigation Buttons */
.modal-nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 100;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.2s;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  user-select: none;
}

.modal-nav-btn:active {
  transform: translateY(-50%) scale(0.92);
}

.question-modal .modal-nav-btn {
  background: var(--bg-input);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.question-modal .modal-nav-btn:hover {
  background: var(--border-color);
}

.image-modal .modal-nav-btn {
  background: rgba(0, 0, 0, 0.6);
  color: white;
}

.image-modal .modal-nav-btn:hover {
  background: rgba(0, 0, 0, 0.85);
}
/* ===== 影片專用樣式 ===== */
.preview-item.video-item {
  position: relative;
}

.preview-item.video-item::after {
  content: '▶';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 40px;
  height: 40px;
  background: rgba(0, 0, 0, 0.75);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  padding-left: 3px; /* 微調三角形對齊 */
  box-shadow: 0 4px 10px rgba(0,0,0,0.3);
  transition: background 0.2s, transform 0.2s;
  pointer-events: none;
  z-index: 2;
}

.preview-item.video-item:hover::after {
  background: var(--accent-color);
  transform: translate(-50%, -50%) scale(1.1);
}

/* 廣播播放器與一般影片容器樣式 */
#broadcastPlayerContainer iframe,
#broadcastPlayerContainer video,
#videoPlayerContainer iframe,
#videoPlayerContainer video {
  width: 100%;
  height: 100%;
  border: none;
  object-fit: contain;
}

/* ===== 教師分享區 (Teacher Share Area) ===== */
.share-creation-box .preset-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  transition: all 0.2s;
}
.share-creation-box .preset-btn.active-share-type {
  background: var(--accent-color) !important;
  color: white !important;
  border-color: var(--accent-color) !important;
}

.share-item-card {
  width: 100%;
  padding: 12px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  box-sizing: border-box;
}

.share-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text-muted);
}

.share-item-content-text {
  font-size: 14px;
  color: var(--text-primary);
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-all;
}

.share-item-content-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent-color);
  text-decoration: none;
  font-weight: bold;
  font-size: 14px;
  word-break: break-all;
}
.share-item-content-link:hover {
  text-decoration: underline;
}

.share-item-content-image {
  max-width: 140px;
  max-height: 140px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  cursor: zoom-in;
  transition: transform 0.2s;
  object-fit: cover;
}
.share-item-content-image:hover {
  transform: scale(1.02);
}

.share-copy-btn {
  padding: 4px 8px;
  background: var(--accent-color);
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
  font-weight: bold;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: opacity 0.2s;
  height: 26px;
  line-height: 1;
}
.share-copy-btn:hover {
  opacity: 0.9;
}

/* ===== 後台摺疊區塊樣式 (Collapsible Admin Sections) ===== */
.admin-section-collapsible {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  margin-bottom: 16px !important;
  overflow: hidden;
  transition: box-shadow 0.3s ease;
}

.admin-section-collapsible:hover {
  box-shadow: var(--shadow-hover);
}

.admin-section-collapsible .admin-section-header {
  padding: 14px 18px;
  background: var(--bg-header-gradient, linear-gradient(135deg, rgba(0, 122, 255, 0.05), rgba(0, 122, 255, 0.02)));
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
  border-bottom: 1px solid var(--border-color);
}

.admin-section-collapsible .admin-section-header h3 {
  margin: 0 !important;
  color: var(--text-primary);
  font-size: 15px;
  font-weight: bold;
}

.admin-section-collapsible .admin-section-header .collapse-icon {
  font-size: 12px;
  color: var(--text-secondary);
  transition: transform 0.3s ease;
}

/* 展開狀態 */
.admin-section-collapsible.collapsed .admin-section-header .collapse-icon {
  transform: rotate(-90deg);
}

.admin-section-collapsible .admin-section-body {
  padding: 16px;
  max-height: 3000px; /* 大到足以容納任何內容區塊 */
  opacity: 1;
  transition: max-height 0.5s ease, opacity 0.3s ease, padding 0.5s ease;
  overflow: visible; /* 允許選單/下拉式選單正常彈出 */
}

/* 折疊狀態 */
.admin-section-collapsible.collapsed .admin-section-body {
  max-height: 0;
  padding: 0 16px;
  opacity: 0;
  overflow: hidden;
  pointer-events: none; /* 摺疊時不接收任何滑鼠點擊事件 */
}

/* ===== 彈出視窗留言區樣式 ===== */
.comments-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 8px 4px;
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.02);
  border: 1px dashed var(--border-color);
}

.comment-item {
  padding: 8px 12px;
  border-radius: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  box-shadow: 0 2px 4px rgba(0,0,0,0.02);
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.comment-item .comment-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
}

.comment-item .comment-user {
  font-weight: bold;
  color: var(--accent-color);
}

.comment-item .comment-time {
  color: var(--text-muted);
  font-size: 10px;
}

.comment-item .comment-text {
  font-size: 13px;
  color: var(--text-primary);
  word-break: break-all;
  white-space: pre-wrap;
  line-height: 1.4;
}

/* 在黑底 (如圖片/影片 modal 的 info 區) 留言樣式微調 */
.image-info .comments-list {
  background: rgba(255, 255, 255, 0.05);
  border: 1px dashed rgba(255, 255, 255, 0.15);
}

.image-info .comment-item {
  background: #1c1c1e;
  border: 1px solid #2c2c2e;
}

.image-info .comment-item .comment-user {
  color: #64d2ff;
}

.image-info .comment-item .comment-time {
  color: #8e8e93;
}

.image-info .comment-item .comment-text {
  color: #fff;
}

/* 資料夾拖曳排序視覺樣式 */
.draggable-folder {
  cursor: grab;
  user-select: none;
}
.draggable-folder:active {
  cursor: grabbing;
}
.draggable-folder.dragging {
  opacity: 0.5;
  background: rgba(var(--accent-color-rgb, 0, 122, 255), 0.08) !important;
  border: 1px dashed var(--accent-color) !important;
}

/* 舒爾特方格按鈕點選反饋 */
.schulte-btn:active {
  transform: scale(0.9) !important;
  background: var(--accent-color) !important;
  color: white !important;
  border-color: var(--accent-color) !important;
}

/* 遊戲大廳選擇尺寸卡片選中樣式 */
.grid-size-card.active {
  border: 2px solid var(--accent-color) !important;
  background: rgba(var(--accent-color-rgb, 0, 122, 255), 0.05) !important;
}

/* 動畫效果：倒數跳動 */
@keyframes countdownPulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.15); }
  100% { transform: scale(1); }
}

#focusCountdownNumber {
  animation: countdownPulse 1s infinite;
}

/* OpenCode 修改：專注力遊戲求救提示高亮動畫 */
.schulte-btn.focus-help-highlight {
  animation: focusHelpPulse 1.25s ease-in-out;
  border-color: #ffcc00 !important;
  background: rgba(255, 204, 0, 0.32) !important;
  color: #5a3b00 !important;
  box-shadow: 0 0 0 6px rgba(255, 204, 0, 0.22), 0 0 28px rgba(255, 204, 0, 0.75) !important;
  transform: scale(1.14) !important;
  z-index: 3;
}

@keyframes focusHelpPulse {
  0%, 100% { transform: scale(1); }
  35%, 70% { transform: scale(1.16); }
}

/* OpenCode 修改：位置序列記憶遊戲格子狀態 */
.memory-cell.memory-sequence-highlight {
  background: rgba(52, 199, 89, 0.8) !important;
  border-color: #34c759 !important;
  box-shadow: 0 0 0 6px rgba(52, 199, 89, 0.18), 0 0 24px rgba(52, 199, 89, 0.65) !important;
  transform: scale(1.08);
}

.memory-cell.memory-correct {
  background: rgba(52, 199, 89, 0.22) !important;
  border-color: #34c759 !important;
  opacity: 0.65;
}

.memory-cell.memory-wrong {
  background: rgba(255, 59, 48, 0.18) !important;
  border-color: #ff3b30 !important;
  animation: memoryWrongShake 0.32s ease-in-out;
}

@keyframes memoryWrongShake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

@keyframes rankBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* 一字千金：字力測驗 九宮格與注音直排樣式 */
.chinese-writing-grid {
  width: 90px;
  height: 90px;
  border: 2px solid rgba(220, 50, 50, 0.4);
  border-radius: 8px;
  position: relative;
  background: #fff8f8;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 6px rgba(0,0,0,0.05);
  transition: border-color 0.3s, box-shadow 0.3s, background-color 0.3s;
}

/* OpenCode 修改：一字千金未填寫輸入框之醒目螢光框提醒 */
.chinese-writing-grid.unfilled-fluorescent-highlight {
  border-color: #ff2d55 !important;
  background: rgba(255, 45, 85, 0.12) !important;
  animation: fluorescentPulse 1.2s infinite ease-in-out !important;
  z-index: 5;
}

@keyframes fluorescentPulse {
  0%, 100% {
    box-shadow: 0 0 0 4px rgba(255, 45, 85, 0.5), 0 0 22px rgba(255, 45, 85, 0.85), inset 0 0 12px rgba(255, 45, 85, 0.35);
    border-color: #ff2d55;
  }
  50% {
    box-shadow: 0 0 0 7px rgba(255, 204, 0, 0.75), 0 0 30px rgba(255, 204, 0, 0.95), inset 0 0 16px rgba(255, 204, 0, 0.5);
    border-color: #ffcc00;
  }
}

.chinese-writing-grid::before {
  content: '';
  position: absolute;
  top: 33.33%;
  bottom: 33.33%;
  left: 0;
  right: 0;
  border-top: 1px dashed rgba(220, 50, 50, 0.25);
  border-bottom: 1px dashed rgba(220, 50, 50, 0.25);
  pointer-events: none;
}

.chinese-writing-grid::after {
  content: '';
  position: absolute;
  left: 33.33%;
  right: 33.33%;
  top: 0;
  bottom: 0;
  border-left: 1px dashed rgba(220, 50, 50, 0.25);
  border-right: 1px dashed rgba(220, 50, 50, 0.25);
  pointer-events: none;
}

.zhuyin-text {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: "DFKai-SB", "BiauKai", "Kaiti", serif;
  font-size: 26px;
  color: #b32424;
  letter-spacing: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
}

/* 一字千金輸入框 placeholder 樣式，避免文字太大與直排換行 */
.char-test-input-box::placeholder {
  font-size: 16px;
  font-weight: normal;
  color: var(--text-muted, #999);
  font-family: system-ui, -apple-system, sans-serif;
  letter-spacing: 0;
}

/* 一字千金：字字珠璣 十字選字佈局 */
.character-crossword-container {
  display: grid;
  grid-template-columns: repeat(3, 80px);
  grid-template-rows: repeat(3, 80px);
  gap: 12px;
  justify-content: center;
  align-content: center;
  margin: 15px auto;
}

.character-crossword-cell {
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  font-size: 32px;
  font-weight: bold;
  background: var(--bg-card, #fff);
  border: 1px solid var(--border-color, #ccc);
  color: var(--text-primary, #333);
  font-family: "DFKai-SB", "BiauKai", "Kaiti", serif;
  box-sizing: border-box;
  box-shadow: 0 2px 6px rgba(0,0,0,0.03);
}

.character-crossword-cell.empty {
  border: none;
  background: transparent;
  box-shadow: none;
}

.character-crossword-cell.surrounding {
  background: #fdf5f5;
  border: 2px solid rgba(220, 50, 50, 0.3);
  color: #b32424;
}

/* ===== 抽人轉盤樣式 ===== */
.lucky-wheel-container {
  display: flex;
  gap: 28px;
  align-items: flex-start;
  justify-content: center;
  flex-wrap: wrap;
  margin: 10px 0;
}

.wheel-display-area {
  flex: 1;
  max-width: 460px;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

/* 轉盤右側指針 */
.wheel-pointer {
  display: none; /* 指針改由 Canvas 繪製 */
}

.wheel-pointer::after {
  display: none;
}

.wheel-winner-banner {
  margin-top: 24px;
  font-size: 24px;
  font-weight: bold;
  color: var(--success-color);
  background: rgba(76, 217, 100, 0.1);
  padding: 12px 28px;
  border-radius: 40px;
  border: 2.5px solid var(--success-color);
  box-shadow: 0 4px 15px rgba(76, 217, 100, 0.2);
  text-align: center;
  animation: popIn 0.35s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.winner-name {
  color: #ff2d55;
  font-size: 28px;
  margin-left: 6px;
  text-shadow: 0 0 10px rgba(255, 45, 85, 0.2);
}

.wheel-control-panel {
  width: 330px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 8px 24px var(--shadow-color);
  box-sizing: border-box;
}

.wheel-control-panel h3 {
  margin: 0;
  font-size: 16px;
  font-weight: bold;
  color: var(--text-primary);
}

.control-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.control-header .badge {
  background: var(--accent-color);
  color: white;
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: bold;
}

.results-history ul li {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border-color);
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.results-history ul li:last-child {
  border-bottom: none;
}

@media (max-width: 768px) {
  .wheel-display-area {
    max-width: 320px;
  }
  .wheel-control-panel {
    width: 100%;
  }
  /* 行動端白板左右留出邊距，並加上圓角與陰影，清晰呈現白板範圍 */
  #panel-whiteboard {
    margin-left: 0 !important;
    margin-right: 0 !important;
    border-radius: 16px !important;
    overflow: hidden !important;
    box-shadow: 0 4px 16px rgba(0,0,0,0.06) !important;
  }
  /* 隱藏白板說明文字，釋放高度空間防止遮擋與擠壓工具列 */
  .whiteboard-instructions {
    display: none !important;
  }
  /* 行動端白板卡片高度優化：與手機螢幕高度自適應，開頁即一屏顯示完整工具列 */
  #panel-whiteboard > .panel-body {
    height: calc(100vh - 190px) !important;
    min-height: 330px !important;
  }
}

@media (max-width: 480px) {
  /* 手機版白板左右保持邊距與圓角 */
  #panel-whiteboard {
    margin-left: 0 !important;
    margin-right: 0 !important;
    border-radius: 14px !important;
  }
  /* 超窄手機高度一屏化適應 */
  #panel-whiteboard > .panel-body {
    height: calc(100vh - 185px) !important;
    min-height: 320px !important;
  }
}

/* 留言數量通知徽章 (只保留純紅色數字圓標，與紅框標註 100% 一致) */
.card-comment-badge {
  position: absolute;
  top: 6px;
  right: 6px;
  z-index: 10;
  background: #ff3b30;
  color: #ffffff;
  font-size: 11px;
  font-weight: 800;
  line-height: 1;
  padding: 3px 6px;
  min-width: 18px;
  height: 18px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 6px rgba(255, 59, 48, 0.4);
  border: 1.5px solid #ffffff;
  cursor: pointer;
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.2s ease;
  user-select: none;
}

.card-comment-badge:hover {
  transform: scale(1.15);
  box-shadow: 0 4px 10px rgba(255, 59, 48, 0.5);
}

.card-comment-badge:active {
  transform: scale(0.95);
}