/* 模态框样式 */
/* 预览模态框 - 居中悬浮显示 */
#previewModal {
  display: none;
  position: fixed;
  z-index: 10000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

#previewModal .modal-content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  max-width: 95vw;
  max-height: 95vh;
  overflow: auto;
  text-align: center;
  animation: modalFadeIn 0.3s ease-out;
}

@keyframes modalFadeIn {
  from {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.9);
  }
  to {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}

#previewModal .modal-content > * {
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  border-radius: 20px;
}

#previewModal .modal-content img {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

#previewModal .modal-content video {
  max-width: 90vw;
  max-height: 85vh;
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

#previewModal .modal-content audio {
  width: 100%;
}

#previewModal .close-modal {
  position: fixed;
  top: 20px;
  right: 30px;
  color: #fff;
  font-size: 36px;
  font-weight: bold;
  cursor: pointer;
  z-index: 10001;
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.5);
  border-radius: 50%;
  transition: all 0.3s ease;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

#previewModal .close-modal:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: rotate(90deg);
}

/* ==================== 暗色主题 ==================== */
[data-theme="dark"] {
  --bg-color: #1a1a2e;
  --card-bg: #16213e;
  --text-color: #e8e8e8;
  --text-secondary: #a0a0a0;
  --border-color: #2d3748;
  --primary-color: #4a90d9;
  --primary-hover: #357abd;
  --danger-color: #e74c3c;
  --success-color: #27ae60;
  --warning-color: #f39c12;
  --gray: #6c757d;
  --input-bg: #1e2a3a;
  --hover-bg: #1e3a5f;
}

[data-theme="dark"] body {
  background-color: var(--bg-color);
  color: var(--text-color);
}

[data-theme="dark"] .sidebar {
  background: linear-gradient(180deg, #1a1a2e 0%, #16213e 100%);
  border-right: 1px solid var(--border-color);
}

[data-theme="dark"] .main-content {
  background-color: var(--bg-color);
}

[data-theme="dark"] header {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
}

[data-theme="dark"] .upload-panel {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
}

[data-theme="dark"] .upload-area {
  background: var(--input-bg);
  border-color: var(--border-color);
}

[data-theme="dark"] .upload-area:hover {
  border-color: var(--primary-color);
  background: var(--hover-bg);
}

[data-theme="dark"] .file-grid,
[data-theme="dark"] .file-list {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
}

[data-theme="dark"] .file-item {
  background: var(--input-bg);
  border-color: var(--border-color);
}

[data-theme="dark"] .file-item:hover {
  background: var(--hover-bg);
  border-color: var(--primary-color);
}

[data-theme="dark"] .file-row {
  border-bottom: 1px solid var(--border-color);
}

[data-theme="dark"] .file-row:hover {
  background: var(--hover-bg);
}

[data-theme="dark"] .toolbar {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
}

[data-theme="dark"] .search-input {
  background: var(--input-bg);
  border-color: var(--border-color);
  color: var(--text-color);
}

[data-theme="dark"] .search-input:focus {
  border-color: var(--primary-color);
}

[data-theme="dark"] .btn-outline {
  border-color: var(--border-color);
  color: var(--text-color);
}

[data-theme="dark"] .btn-outline:hover {
  background: var(--hover-bg);
}

[data-theme="dark"] .nav-item {
  color: var(--text-secondary);
}

[data-theme="dark"] .nav-item:hover,
[data-theme="dark"] .nav-item.active {
  background: var(--hover-bg);
  color: var(--text-color);
}

[data-theme="dark"] .folder-item {
  background: var(--input-bg);
  border-color: var(--border-color);
}

[data-theme="dark"] .folder-item:hover {
  background: var(--hover-bg);
}

[data-theme="dark"] .quota-bar {
  background: var(--input-bg);
}

[data-theme="dark"] .user-info {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
}

[data-theme="dark"] .dropdown-menu {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .dropdown-item:hover {
  background: var(--hover-bg);
}

[data-theme="dark"] #previewModal .modal-content > div {
  background: var(--card-bg) !important;
  color: var(--text-color);
}

[data-theme="dark"] input,
[data-theme="dark"] select,
[data-theme="dark"] textarea {
  background: var(--input-bg);
  border-color: var(--border-color);
  color: var(--text-color);
}

[data-theme="dark"] input:focus,
[data-theme="dark"] select:focus,
[data-theme="dark"] textarea:focus {
  border-color: var(--primary-color);
}

/* ==================== 主题切换按钮 ==================== */
.theme-toggle {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary-color);
  color: white;
  border: none;
  cursor: pointer;
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  transition: all 0.3s ease;
  z-index: 1000;
}

.theme-toggle:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
}

/* ==================== 收藏按钮样式 ==================== */
.favorite-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 18px;
  padding: 4px;
  opacity: 0.6;
  transition: all 0.2s ease;
}

.favorite-btn:hover {
  opacity: 1;
  transform: scale(1.2);
}

.favorite-btn.favorited {
  opacity: 1;
  color: #f1c40f;
}

/* ==================== 文件操作按钮组 ==================== */
.file-actions {
  display: flex;
  gap: 8px;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.file-item:hover .file-actions,
.file-row:hover .file-actions {
  opacity: 1;
}

.action-btn {
  padding: 4px 8px;
  border: none;
  background: rgba(0, 0, 0, 0.1);
  border-radius: 4px;
  cursor: pointer;
  font-size: 12px;
  transition: all 0.2s ease;
}

.action-btn:hover {
  background: var(--primary-color);
  color: white;
}

[data-theme="dark"] .action-btn {
  background: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .action-btn:hover {
  background: var(--primary-color);
}

/* ==================== 按钮样式增强 ==================== */
.btn {
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-primary {
  background: var(--primary-color);
  color: white;
  border: none;
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-color);
}

.btn-outline:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

/* 选择下拉菜单 */
.select-dropdown {
  position: relative;
  display: inline-block;
}

.select-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  background: white;
  border: 1px solid #e1e5eb;
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
  min-width: 160px;
  z-index: 100;
  margin-top: 8px;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.select-dropdown-menu .dropdown-item {
  padding: 10px 16px;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 13px;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
  border: 1px solid #dee2e6;
  border-radius: 8px;
  color: #495057;
  white-space: nowrap;
}

.select-dropdown-menu .dropdown-item:hover {
  background: linear-gradient(135deg, #4361ee 0%, #3451de 100%);
  border-color: #4361ee;
  color: white;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(67, 97, 238, 0.3);
}

.select-dropdown-menu .dropdown-item:active {
  background: linear-gradient(135deg, #3451de 0%, #2541ce 100%);
  transform: translateY(0);
  box-shadow: none;
}

/* 暗色主题适配 */
[data-theme="dark"] .select-dropdown-menu {
  background: #1e1e1e;
  border-color: #333;
}

[data-theme="dark"] .select-dropdown-menu .dropdown-item {
  background: linear-gradient(135deg, #2d2d2d 0%, #252525 100%);
  border-color: #444;
  color: #e0e0e0;
}

[data-theme="dark"] .select-dropdown-menu .dropdown-item:hover {
  background: linear-gradient(135deg, #4361ee 0%, #3451de 100%);
  border-color: #4361ee;
  color: white;
}