/**
 * TOC Enhanced Styles
 * 目录组件增强样式 - 支持滚动、美化滚动条、适配主题
 */

/* ===== 核心滚动容器样式 ===== */
.widget.toc .card-content.toc-content {
  max-height: calc(100vh - 140px);
  overflow-y: auto;
  overflow-x: hidden;
  scroll-behavior: smooth;
  position: relative;
  padding-bottom: 8px;
  /* 性能优化 */
  will-change: scroll-position;
  -webkit-overflow-scrolling: touch;
}

/* ===== 滚动条美化 - Webkit 浏览器 ===== */
.widget.toc .toc-content::-webkit-scrollbar {
  width: 4px;
}

.widget.toc .toc-content::-webkit-scrollbar-track {
  background: transparent;
  border-radius: 4px;
}

.widget.toc .toc-content::-webkit-scrollbar-thumb {
  background: var(--theme, #409eff);
  border-radius: 4px;
  opacity: 0.6;
  transition: background 0.3s ease;
}

.widget.toc .toc-content::-webkit-scrollbar-thumb:hover {
  background: var(--theme, #409eff);
  opacity: 1;
}

/* ===== 滚动条美化 - Firefox ===== */
.widget.toc .toc-content {
  scrollbar-width: thin;
  scrollbar-color: var(--theme, #409eff) transparent;
}

/* ===== 渐变遮罩容器 ===== */
.widget.toc {
  position: relative;
}

/* 顶部渐变遮罩 - 表示上方有更多内容 */
.widget.toc .toc-content::before {
  content: '';
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  height: 20px;
  margin-bottom: -20px;
  background: linear-gradient(
    to bottom,
    var(--background, #fff) 0%,
    var(--background, #fff) 30%,
    transparent 100%
  );
  pointer-events: none;
  z-index: 2;
  opacity: 0;
  transition: opacity 0.3s ease;
}

/* 底部渐变遮罩 - 表示下方有更多内容 */
.widget.toc .toc-content::after {
  content: '';
  position: sticky;
  bottom: 0;
  left: 0;
  right: 0;
  height: 20px;
  margin-top: -20px;
  background: linear-gradient(
    to top,
    var(--background, #fff) 0%,
    var(--background, #fff) 30%,
    transparent 100%
  );
  pointer-events: none;
  z-index: 2;
  opacity: 0;
  transition: opacity 0.3s ease;
}

/* 显示渐变遮罩的状态类 */
.widget.toc .toc-content.can-scroll-up::before {
  opacity: 1;
}

.widget.toc .toc-content.can-scroll-down::after {
  opacity: 1;
}

/* ===== 目录项样式增强 ===== */
.widget.toc .menu-list a {
  transition: all 0.25s ease;
  border-radius: 4px;
  margin: 2px 0;
}

.widget.toc .menu-list a.is-active {
  background-color: var(--bg-e, #409eff);
  color: var(--light-a, #fff);
  font-weight: 500;
  transform: translateX(2px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.widget.toc .menu-list a:not(.is-active):hover {
  background-color: var(--bg-c, #f5f5f5);
  transform: translateX(2px);
}

/* 目录项图标动画 */
.widget.toc .menu-list a i {
  transition: transform 0.25s ease, color 0.25s ease;
}

.widget.toc .menu-list a.is-active i,
.widget.toc .menu-list a:hover i {
  transform: rotate(45deg);
  color: var(--theme, #409eff);
}

.widget.toc .menu-list a.is-active i {
  color: inherit;
}

/* ===== 响应式设计 ===== */

/* 大屏幕 - 更大的最大高度 */
@media (min-height: 900px) {
  .widget.toc .card-content.toc-content {
    max-height: calc(100vh - 120px);
  }
}

/* 平板设备 */
@media (max-width: 1023px) {
  .widget.toc .card-content.toc-content {
    max-height: calc(100vh - 120px);
  }
}

/* 移动端抽屉模式下的目录 */
.navbar-slideout .toc-content {
  max-height: calc(100vh - 300px);
  overflow-y: auto;
  scroll-behavior: smooth;
}

.navbar-slideout .toc-content::-webkit-scrollbar {
  width: 3px;
}

.navbar-slideout .toc-content::-webkit-scrollbar-thumb {
  background: var(--theme, #409eff);
  border-radius: 3px;
}

/* ===== 暗色主题适配 ===== */
html[data-theme="dark"] .widget.toc .toc-content::before,
html.dark .widget.toc .toc-content::before {
  background: linear-gradient(
    to bottom,
    var(--background, #1a1a2e) 0%,
    var(--background, #1a1a2e) 30%,
    transparent 100%
  );
}

html[data-theme="dark"] .widget.toc .toc-content::after,
html.dark .widget.toc .toc-content::after {
  background: linear-gradient(
    to top,
    var(--background, #1a1a2e) 0%,
    var(--background, #1a1a2e) 30%,
    transparent 100%
  );
}

html[data-theme="dark"] .widget.toc .menu-list a.is-active,
html.dark .widget.toc .menu-list a.is-active {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

/* ===== 动画效果 ===== */
@keyframes toc-highlight {
  0% {
    background-color: var(--bg-e, #409eff);
  }
  50% {
    background-color: var(--theme, #409eff);
  }
  100% {
    background-color: var(--bg-e, #409eff);
  }
}

.widget.toc .menu-list a.is-active.toc-flash {
  animation: toc-highlight 0.6s ease;
}

/* ===== 无内容时的样式 ===== */
.widget.toc .toc-content:empty::before,
.widget.toc .toc-content:empty::after {
  display: none;
}

/* ===== 打印样式 ===== */
@media print {
  .widget.toc .card-content.toc-content {
    max-height: none;
    overflow: visible;
  }
  
  .widget.toc .toc-content::before,
  .widget.toc .toc-content::after {
    display: none;
  }
}