/* 侧边栏样式 */
.sidebar {
  background: var(--bg-primary);
  border-right: 1px solid var(--border-light);
  overflow-y: auto;
  position: relative;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.05);
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* 侧边栏头部 */
.sidebar-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-light);
  background: var(--bg-primary);
  position: relative;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.brand-icon {
  color: var(--accent-600);
  flex-shrink: 0;
  transition: color 0.2s ease;
}

.brand-text {
  flex: 1;
  min-width: 0;
}

.brand-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.2;
}

.brand-subtitle {
  font-size: 13px;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.3;
}

/* 主题切换按钮 */
.theme-toggle {
  position: absolute;
  top: 16px;
  right: 16px;
  background: none;
  border: none;
  padding: 8px;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--accent-600);
  outline-offset: 2px;
}

.theme-toggle .moon-icon {
  display: none;
}

[data-theme="dark"] .theme-toggle .sun-icon {
  display: none;
}

[data-theme="dark"] .theme-toggle .moon-icon {
  display: block;
}

/* 搜索框 */
.sidebar-search {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-light);
}

.search-container {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 12px;
  color: var(--text-muted);
  pointer-events: none;
  z-index: 1;
}

.sidebar-search-input {
  width: 100%;
  padding: 8px 12px 8px 36px;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  font-size: 14px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  transition: all 0.2s ease;
}

.sidebar-search-input:focus {
  outline: none;
  border-color: var(--accent-500);
  box-shadow: 0 0 0 3px var(--accent-100);
}

.sidebar-search-input::placeholder {
  color: var(--text-muted);
}

/* 导航区域 */
.sidebar-nav {
  padding: 8px 0;
  flex: 1;
  overflow-y: auto;
}

.nav-section-title {
  padding: 12px 20px 8px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin: 0;
}

.nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-item {
  margin: 2px 8px;
}

.nav-link {
  display: block;
  padding: 8px 12px;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
  position: relative;
}

.nav-link:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.nav-link:focus-visible {
  outline: 2px solid var(--accent-600);
  outline-offset: 2px;
}

.nav-link.active {
  background: var(--accent-50);
  color: var(--accent-700);
  font-weight: 500;
}

.nav-link.active .nav-icon {
  color: var(--accent-600);
}

.nav-link-content {
  display: flex;
  align-items: center;
  gap: 12px;
  position: relative;
}

.nav-icon {
  color: var(--text-muted);
  flex-shrink: 0;
  transition: color 0.2s ease;
}

.nav-text-content {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.nav-title {
  font-size: 14px;
  line-height: 1.3;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text-primary);
}

.nav-subtitle {
  font-size: 11px;
  color: var(--text-muted);
  font-family: 'Monaco', 'Consolas', 'Courier New', monospace;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  opacity: 0.8;
}

.nav-description {
  font-size: 12px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-indicator {
  position: absolute;
  right: -12px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 20px;
  background: var(--accent-600);
  border-radius: 2px;
}

/* 系统信息 */
.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border-light);
  background: var(--bg-tertiary);
  margin-top: auto;
}

.system-info {
  margin-bottom: 12px;
}

.info-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.info-label {
  font-weight: 500;
}

.info-value {
  color: var(--text-primary);
  font-weight: 600;
}

.settings-button {
  width: 100%;
  padding: 8px 12px;
  background: none;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.settings-button:hover {
  background: var(--bg-primary);
  color: var(--text-primary);
  border-color: var(--border-dark);
}

.settings-button:focus-visible {
  outline: 2px solid var(--accent-600);
  outline-offset: 2px;
}

/* 移动端侧边栏 */
.sidebar-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  display: none;
}

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    top: 0;
    left: -260px;
    height: 100vh;
    z-index: 1000;
    transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 2px 0 20px rgba(0, 0, 0, 0.1);
  }

  .sidebar.open {
    left: 0;
  }

  .sidebar-backdrop {
    display: block;
  }

  .sidebar.open + .sidebar-backdrop {
    opacity: 1;
    visibility: visible;
  }
}

/* 滚动条优化 */
.sidebar::-webkit-scrollbar {
  width: 4px;
}

.sidebar::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
  background: var(--border-medium);
  border-radius: 2px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
  background: var(--border-dark);
}

/* 动画效果 */
.nav-link,
.settings-button {
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 无障碍支持 */
@media (prefers-reduced-motion: reduce) {
  .sidebar,
  .nav-link,
  .settings-button {
    transition: none;
  }
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
  .nav-link {
    border: 1px solid transparent;
  }
  
  .nav-link.active {
    border-color: var(--accent-600);
  }
  
  .nav-indicator {
    width: 4px;
  }
}