:root {
  /* Color Theme */
  --bg-color: #f8f9fa;
  --panel-bg: #ffffff;
  --border-color: #e1e4e8;
  --text-color: #24292e;
  --text-secondary: #586069;
  --accent-color: #0366d6;
  --hover-bg: #f6f8fa;
  --folder-icon: #79b8ff;
  --file-default: #959da5;
  --shadow-color: rgba(0, 0, 0, 0.05);
  
  /* File type colors */
  --js-color: #f1e05a;
  --html-color: #e34c26;
  --css-color: #563d7c;
  --ts-color: #2b7489;
  --py-color: #3572A5;
  --md-color: #083fa1;
  --json-color: #40a9ff;
}

/* Dark theme support */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #0d1117;
    --panel-bg: #161b22;
    --border-color: #30363d;
    --text-color: #c9d1d9;
    --text-secondary: #8b949e;
    --accent-color: #58a6ff;
    --hover-bg: #1f2428;
    --folder-icon: #79b8ff;
    --file-default: #8b949e;
    --shadow-color: rgba(0, 0, 0, 0.3);
  }
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  margin: 0;
  padding: 0;
  line-height: 1.5;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

h1 {
  font-size: 1.75rem;
  margin-bottom: 1.5rem;
  color: var(--text-color);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.75rem;
}

/* File Tree */
.file-tree {
  background-color: var(--panel-bg);
  border-radius: 6px;
  box-shadow: 0 1px 3px var(--shadow-color);
  margin-bottom: 2rem;
  overflow: hidden;
}

.file-tree-header {
  background-color: var(--hover-bg);
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  font-weight: 600;
}

.tree-controls {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background-color: var(--hover-bg);
  border-bottom: 1px solid var(--border-color);
}

.tree-control-btn {
  background-color: transparent;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.25rem 0.75rem;
  font-size: 0.8rem;
  color: var(--text-color);
  cursor: pointer;
  transition: background-color 0.2s;
}

.tree-control-btn:hover {
  background-color: var(--hover-bg);
}

/* Tree List */
.tree-list {
  list-style: none;
  margin: 0;
  padding: 0.5rem 0;
}

.tree-list ul {
  list-style: none;
  margin: 0;
  padding-left: 1.5rem;
  border-left: 1px dotted var(--border-color);
  margin-left: 0.5rem;
}

/* 确保文件夹内容在文件夹名称下方 */
.tree-item {
  margin: 0;
  padding: 0;
  display: block; /* 改为块级元素 */
  position: relative;
}

.tree-item:before {
  content: "";
  position: absolute;
  left: -1rem;
  top: 0.7rem;
  width: 0.5rem;
  height: 1px;
  background-color: var(--border-color);
}

/* Remove connection lines from root level */
#file-tree-root > ul {
  border-left: none;
}

#file-tree-root > ul > .tree-item:before {
  display: none;
}

.item-content {
  display: flex;
  align-items: center;
  padding: 0.25rem 1rem;
  cursor: pointer;
  width: 100%;
  box-sizing: border-box;
}

.directory-item > .item-content {
  cursor: pointer;
}

.directory-item > .item-content:hover {
  background-color: var(--hover-bg);
}

.file-item > .item-content:hover {
  background-color: var(--hover-bg);
}

/* 文件夹子元素容器 */
.directory-children {
  width: 100%;
  overflow: hidden; /* 包含子元素的动画 */
}

/* Ensure folder stays visible */
.directory-item {
  position: relative;
}

.toggle {
  width: 16px;
  height: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-right: 0.25rem;
  color: var(--text-secondary);
  font-size: 0.75rem;
  user-select: none;
}

/* 更新图标样式以适配图片图标 */
.icon {
  margin-right: 0.5rem;
  width: 16px;
  height: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.folder-icon, .file-icon {
  vertical-align: middle;
  object-fit: contain;
}

.folder-name {
  color: var(--text-color);
  font-weight: 500;
}

.file-link {
  color: var(--text-color);
  text-decoration: none;
  display: inline-block;
  flex-grow: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-link:hover {
  color: var(--accent-color);
  text-decoration: underline;
}

/* Loading and Error states */
#loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  color: var(--text-secondary);
}

.loading-spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--border-color);
  border-radius: 50%;
  border-top-color: var(--accent-color);
  animation: spin 1s linear infinite;
  margin-right: 0.5rem;
}

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

#error {
  display: none;
  background-color: #ffebe9;
  border: 1px solid #ffc1ba;
  color: #b62324;
  padding: 1rem;
  margin: 1rem 0;
  border-radius: 6px;
}

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }
}