/* 侧边栏样式 */
/* 导入字体 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Noto Sans SC', sans-serif;
}

#main {
  transition: margin-left 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  padding: 16px;
}

/* 侧边栏切换按钮 */
.togglebtn {
  font-size: 24px;
  cursor: pointer;
  background-color: rgba(0, 0, 0, 0.2);
  color: white;
  padding: 10px 15px;
  border: none;
  border-radius: 50%;
  position: fixed;
  top: 20px;
  left: 20px;
  z-index: 100;
  transition: all 0.3s ease;
  backdrop-filter: blur(5px);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.togglebtn:hover {
  background-color: rgba(0, 0, 0, 0.4);
  transform: scale(1.1);
}

/* 侧边栏容器 */
.sidebar {
  height: 100%;
  width: 0;
  position: fixed;
  z-index: 1000;
  top: 0;
  left: 0;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  overflow-x: hidden;
  transition: width 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  padding-top: 60px;
  border-right: 1px solid rgba(255, 255, 255, 0.2);
}

/* 侧边栏链接 */
.sidebar a {
  padding: 12px 15px 12px 32px;
  text-decoration: none;
  font-size: 18px;
  font-weight: 500;
  color: white;
  display: block;
  transition: all 0.3s ease;
  border-radius: 0 20px 20px 0;
  margin-bottom: 5px;
  position: relative;
}

.sidebar a:hover {
  background: rgba(255, 255, 255, 0.2);
  padding-left: 40px;
  color: #fff;
}

/* 关闭按钮 */
.sidebar .closebtn {
  position: absolute;
  top: 0;
  right: 25px;
  font-size: 20px;
  margin-left: 50px;
  color: white;
  transition: all 0.3s ease;
}

.sidebar .closebtn:hover {
  transform: rotate(90deg);
  color: #f8f8f8;
}

/* 折叠面板样式 */
.collapsible-header {
  font-size: 20px;
  font-weight: 700;
  color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-right: 20px;
}

.collapsible-header:hover {
  background: rgba(255, 255, 255, 0.15);
}

/* 箭头样式 */
.arrow {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-right: 2px solid white;
  border-bottom: 2px solid white;
  transform: rotate(45deg);
  transition: transform 0.3s ease;
}

.arrow.down {
  transform: rotate(135deg);
}

/* 折叠内容 */
.collapsible-content {
  display: none;
  padding-left: 20px; /* 缩进以显示层次感 */
  animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateX(-10px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* 折叠内容链接 */
.collapsible-content a {
  font-size: 16px;
  font-weight: 400;
  padding: 10px 15px 10px 40px; /* 进一步缩进子标题 */
  color: rgba(255, 255, 255, 0.9); /* 子标题颜色稍浅 */
}

.collapsible-content a:hover {
  padding-left: 48px;
  background: rgba(255, 255, 255, 0.1);
}

/* 侧边栏链接特殊样式 */
.sidebar-link {
  position: relative;
  overflow: hidden;
}

.sidebar-link::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 3px;
  background: linear-gradient(to bottom, #4facfe, #00f2fe);
  transform: scaleY(0);
  transition: transform 0.3s ease;
}

.sidebar-link:hover::before {
  transform: scaleY(1);
}

/* 响应式设计 */
@media screen and (max-width: 768px) {
  .sidebar {
    padding-top: 15px;
  }
  .sidebar a {
    font-size: 16px;
  }
  .collapsible-header {
    font-size: 18px;
  }
  .collapsible-content a {
    font-size: 14px;
  }
  #main {
    padding: 8px;
  }
  .togglebtn {
    top: 10px;
    left: 10px;
    font-size: 20px;
    padding: 8px 12px;
  }
}

@media screen and (max-width: 480px) {
  .sidebar {
    width: 0;
    max-width: 250px;
  }
}

/* 滚动条样式 */
.sidebar::-webkit-scrollbar {
  width: 6px;
}

.sidebar::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.1);
}

.sidebar::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.3);
  border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.5);
}