/* ========== 侧边栏导航菜单 ========== */
.nav-menu {
  flex: 1;
  overflow-y: auto;
  padding: 4px 8px 16px;
  scrollbar-width: none; /* Firefox */
  -ms-overflow-style: none; /* IE and Edge */
}

.nav-menu::-webkit-scrollbar {
  display: none !important; /* Chrome, Safari, Opera */
  width: 0 !important;
  height: 0 !important;
}

.nav-list {
  list-style: none;
}

.nav-item.loading {
  padding: 24px 12px;
  text-align: center;
}

/* 加载动画 */
.loading-dots {
  display: flex;
  justify-content: center;
  gap: 6px;
}

.loading-dots span {
  width: 6px;
  height: 6px;
  background: var(--text-placeholder);
  border-radius: 50%;
  animation: loadingDot 1.4s infinite ease-in-out both;
}

.loading-dots span:nth-child(1) { animation-delay: -0.32s; }
.loading-dots span:nth-child(2) { animation-delay: -0.16s; }

@keyframes loadingDot {
  0%, 80%, 100% { transform: scale(0.6); opacity: 0.5; }
  40% { transform: scale(1); opacity: 1; }
}

/* 目录样式 */
.nav-dir {
  list-style: none;
  margin: 0;
}

.nav-dir-header {
  padding: 6px 12px;
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  user-select: none;
  transition: background 0.15s;
  font-size: 13px;
  color: var(--text-body);
  font-weight: 500;
  border-radius: 6px;
  margin: 1px 0;
  position: relative;
}

.nav-dir-header:hover {
  background-color: var(--bg-hover);
}

.nav-dir-toggle {
  font-size: 10px;
  transition: transform 0.15s;
  color: var(--text-placeholder);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.nav-dir.expanded > .nav-dir-header > .nav-dir-toggle {
  transform: rotate(90deg);
}

.nav-dir-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.nav-dir-name.has-readme {
  color: var(--text-body);
  cursor: pointer;
  transition: color 0.15s;
}

.nav-dir-name.has-readme:hover {
  color: var(--primary);
}

.nav-dir.active > .nav-dir-header .nav-dir-name {
  color: var(--primary);
  font-weight: 500;
}

.nav-dir.active > .nav-dir-header {
  background-color: var(--bg-active);
}

.nav-dir.active > .nav-dir-header::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 16px;
  background: var(--primary);
  border-radius: 0 2px 2px 0;
}

.nav-dir-children {
  list-style: none;
  padding: 0 0 0 20px;
  margin: 0;
}

/* 文件项样式 */
.nav-item-file {
  padding: 6px 12px;
  cursor: pointer;
  transition: all 0.15s;
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  border-radius: 6px;
  margin: 1px 0;
  position: relative;
}

.nav-item-file:hover {
  background-color: var(--bg-hover);
  color: var(--text-body);
}

.nav-item-file.active {
  background-color: var(--bg-active);
  color: var(--primary);
}

.nav-item-file.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 16px;
  background: var(--primary);
  border-radius: 0 2px 2px 0;
}

.nav-item-title {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}

.nav-file-icon {
  flex-shrink: 0;
  color: inherit;
}

.nav-item-file.active .nav-file-icon {
  color: var(--primary);
}

/* 隐藏侧边栏滚动条 */
.sidebar {
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.sidebar::-webkit-scrollbar {
  display: none !important;
  width: 0 !important;
  height: 0 !important;
}