/* H2 */
.md-sidebar--secondary > .md-nav > .md-nav__list > .md-nav__item > .md-nav__link {
  color: #333 !important;
  font-weight: 600;
}

/* H3 */
.md-sidebar--secondary nav.md-nav > .md-nav__list > .md-nav__item > nav.md-nav > .md-nav__list > .md-nav__item > .md-nav__link {
  color: #555 !important;
}

/* H4 */
.md-sidebar--secondary nav.md-nav > .md-nav__list > .md-nav__item > nav.md-nav > .md-nav__list > .md-nav__item > nav.md-nav > .md-nav__list > .md-nav__item > .md-nav__link {
  color: #777 !important;
}

/* H5 */
.md-sidebar--secondary nav.md-nav > .md-nav__list > .md-nav__item > nav.md-nav > .md-nav__list > .md-nav__item > nav.md-nav > .md-nav__list > .md-nav__item > nav.md-nav > .md-nav__list > .md-nav__item > .md-nav__link {
  color: #999 !important;
}

/* 加入平滑过渡动画（所有标题） */
.md-sidebar--secondary .md-nav__link {
  transition: color 0.3s ease, transform 0.2s ease;
}

/* H2 hover */
.md-sidebar--secondary > .md-nav > .md-nav__list > .md-nav__item > .md-nav__link:hover {
  color: #ff6b6b !important; /* 更亮的红色 */
  transform: scale(1.05);
}

/* H3 hover */
.md-sidebar--secondary nav.md-nav > .md-nav__list > .md-nav__item > nav.md-nav > .md-nav__list > .md-nav__item > .md-nav__link:hover {
  color: #ffb347 !important; /* 更亮的橙色 */
  transform: scale(1.05);
}

/* H4 hover */
.md-sidebar--secondary nav.md-nav > .md-nav__list > .md-nav__item > nav.md-nav > .md-nav__list > .md-nav__item > nav.md-nav > .md-nav__list > .md-nav__item > .md-nav__link:hover {
  color: #5dade2 !important; /* 更亮的蓝色 */
  transform: scale(1.05);
}



/* 给所有目录链接一个定位（伪元素才能显示） */
.md-sidebar--secondary .md-nav__link {
  position: relative;
}

/* 当前激活标题的彩条 */
.md-sidebar--secondary .md-nav__link--active::before,
.md-sidebar--secondary .md-nav__item--active > .md-nav__link::before,
.md-sidebar--secondary .md-nav__item--current > .md-nav__link::before {
  content: "";
  position: absolute;
  left: -0.8rem;
  top: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, #e74c3c, #f39c12);
  border-radius: 2px;
}


.md-sidebar--secondary .md-nav__item > .md-nav__link { padding-left: 0.4rem; }
.md-sidebar--secondary .md-nav__item > nav .md-nav__link { padding-left: 1.2rem; }
.md-sidebar--secondary .md-nav__item > nav > ul > li > nav .md-nav__link { padding-left: 2rem; }

.md-sidebar--secondary .md-nav__link {
  border-radius: 6px;
  transition: all 0.25s ease;
}

.md-sidebar--secondary .md-nav__link:hover {
  background: rgba(52, 152, 219, 0.08);
  padding-left: 0.6rem;
}

.md-sidebar--secondary::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 4px;
  height: var(--scroll-progress, 0%);
  background: linear-gradient(180deg, #e74c3c, #3498db);
  transition: height 0.3s ease;
}