/* ============================================
   在线工具箱 - 侧边栏样式
   ============================================ */

/* --- 侧边栏容器 --- */

/* #sidebar 占位：JS 加载前显示骨架，避免布局跳动 */
#sidebar:not(.sidebar) {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  border-right: 1px solid var(--sidebar-border);
  z-index: var(--z-sidebar);
}

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  border-right: 1px solid var(--sidebar-border);
  z-index: var(--z-sidebar);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal);
  overflow: hidden;
}

/* --- 侧边栏头部 --- */
.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  height: 60px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--sidebar-border);
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

.sidebar-logo svg {
  width: 24px;
  height: 24px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.sidebar-close {
  display: none;
  width: 32px;
  height: 32px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.sidebar-close:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.sidebar-close svg {
  width: 20px;
  height: 20px;
}

/* --- 侧边栏导航 --- */
.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: var(--space-sm) 0;
}

.nav-list {
  padding: 0 var(--space-sm);
}

/* --- 一级菜单项 --- */
.nav-item {
  margin-bottom: 2px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 9px var(--space-md);
  border-radius: var(--radius-md);
  color: var(--sidebar-text);
  font-size: var(--text-md);
  font-weight: 500;
  transition: background var(--transition-fast), color var(--transition-fast);
  user-select: none;
  text-decoration: none;
}

.nav-link:hover {
  background: var(--color-surface-hover);
  color: var(--sidebar-text-hover);
}

.nav-link.active {
  background: var(--sidebar-active-bg);
  color: var(--color-primary);
  font-weight: 600;
}

.nav-link svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  opacity: 0.75;
}

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

.nav-arrow {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  transition: transform var(--transition-normal);
  opacity: 0.5;
}

.nav-item.open > .nav-link .nav-arrow {
  transform: rotate(90deg);
  opacity: 0.75;
}

/* --- 二级子菜单 --- */
.submenu {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal);
}

.nav-item.open > .submenu {
  max-height: 600px;
}

.submenu-list {
  padding: 2px 0 4px 0;
}

.submenu-item {
  position: relative;
}

.submenu-link {
  display: flex;
  align-items: center;
  padding: 7px var(--space-md) 7px calc(var(--space-md) + 20px + var(--space-sm));
  color: var(--sidebar-text);
  font-size: var(--text-base);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.submenu-link:hover {
  background: var(--color-surface-hover);
  color: var(--sidebar-text-hover);
}

.submenu-link.active {
  background: var(--sidebar-active-bg);
  color: var(--color-primary);
  font-weight: 500;
}

.submenu-link.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 3px;
  background: var(--color-primary);
  border-radius: 0 2px 2px 0;
}

/* --- 三级子菜单 --- */
.submenu-item.has-submenu > .submenu-link {
  padding-right: var(--space-md);
}

.submenu-link .nav-arrow {
  width: 14px;
  height: 14px;
  margin-left: auto;
  opacity: 0.4;
}

.submenu-item.open > .submenu-link .nav-arrow {
  transform: rotate(90deg);
  opacity: 0.6;
}

.sub-submenu {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal);
}

.submenu-item.open > .sub-submenu {
  max-height: 400px;
}

.sub-submenu-list {
  padding: 2px 0;
}

.sub-submenu-link {
  display: block;
  padding: 6px var(--space-md) 6px calc(var(--space-md) + 20px + var(--space-sm) + 16px);
  color: var(--sidebar-text);
  font-size: var(--text-sm);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sub-submenu-link:hover {
  background: var(--color-surface-hover);
  color: var(--sidebar-text-hover);
}

.sub-submenu-link.active {
  background: var(--sidebar-active-bg);
  color: var(--color-primary);
  font-weight: 500;
}

/* --- 侧边栏底部 --- */
.sidebar-footer {
  padding: var(--space-sm) var(--space-md);
  border-top: 1px solid var(--sidebar-border);
  flex-shrink: 0;
}

.sidebar-footer-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 8px var(--space-md);
  border-radius: var(--radius-md);
  color: var(--sidebar-text);
  font-size: var(--text-base);
  transition: background var(--transition-fast), color var(--transition-fast);
  text-decoration: none;
}

.sidebar-footer-link:hover {
  background: var(--color-surface-hover);
  color: var(--sidebar-text-hover);
}

.sidebar-footer-link svg {
  width: 18px;
  height: 18px;
  opacity: 0.7;
}

/* --- 遮罩层 --- */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: var(--z-overlay);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.sidebar-overlay.show {
  display: block;
  opacity: 1;
}

/* --- 移动端顶栏 --- */
.mobile-header {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 56px;
  background: var(--sidebar-bg);
  border-bottom: 1px solid var(--sidebar-border);
  z-index: var(--z-header);
  padding: 0 var(--space-md);
  align-items: center;
  gap: var(--space-sm);
}

.mobile-header-left {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.menu-toggle {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  transition: background var(--transition-fast);
}

.menu-toggle:hover {
  background: var(--color-surface-hover);
}

.menu-toggle svg {
  width: 22px;
  height: 22px;
}

.mobile-header-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
}

.mobile-header-right {
  margin-left: auto;
}

/* --- 主题切换按钮 --- */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast);
}

/* 侧边栏底部：图标+文字，宽度自适应 */
.sidebar-footer .theme-toggle {
  width: auto;
  height: auto;
  gap: var(--space-sm);
  padding: 8px var(--space-md);
}

/* Header / 其他位置：纯图标 40px */
.theme-toggle:not(.sidebar-footer .theme-toggle) {
  width: 40px;
  height: 40px;
}

.theme-toggle:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

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

.theme-toggle .icon-moon {
  display: block;
}

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

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

/* --- 主内容区 --- */
.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  transition: margin-left var(--transition-normal);
}

/* ============================================
   响应式 - 平板及以下 (<1024px)
   ============================================ */
@media (max-width: 1023px) {
  .sidebar {
    transform: translateX(-100%);
    box-shadow: none;
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: var(--shadow-xl);
  }

  .sidebar-close {
    display: flex;
  }

  .mobile-header {
    display: flex;
  }

  .main-content {
    margin-left: 0 !important;
    padding-top: 56px;
  }
}

/* ============================================
   响应式 - 小屏手机 (<480px)
   ============================================ */
@media (max-width: 479px) {
  .sidebar {
    width: 85vw;
    max-width: 300px;
  }

  .nav-link {
    padding: 8px var(--space-sm);
    font-size: var(--text-base);
  }

  .submenu-link {
    padding-left: calc(var(--space-sm) + 20px + var(--space-xs));
  }
}

/* --- 统一 focus-visible 焦点样式 --- */
.nav-link:focus-visible,
.submenu-link:focus-visible,
.sub-submenu-link:focus-visible,
.sidebar-footer-link:focus-visible,
.menu-toggle:focus-visible,
.theme-toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: -2px;
}