/* ===== 侧展栏样式 ===== */
/* 侧展栏触发器 */
.sidebar-toggle {
  position: absolute;
  top: 50%;
  left: 15px;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  background: transparent;
  color: var(--gray-700);
  border: none;
  cursor: pointer;
  z-index: 101;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

/* 侧边栏展开时隐藏触发器 */
.sidebar.open ~ .sidebar-toggle {
  display: none;
}

.sidebar-toggle:hover {
  color: var(--primary);
  transform: translateY(-50%);
}

.sidebar-toggle:active {
  transform: translateY(-50%);
}

/* 侧边栏 */
.sidebar {
  position: fixed;
  top: 0;
  left: -300px;
  width: 300px;
  height: 100vh;
  background: var(--gradient-card);
  box-shadow: var(--shadow-elevation-3);
  z-index: 101;
  transition: left var(--transition-normal);
  overflow-y: auto;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.sidebar.open {
  left: 0;
}

/* 侧展栏内容 */
.sidebar-content {
  height: 100%;
  display: flex;
  flex-direction: column;
  padding: var(--spacing-4);
}

/* 侧展栏头部 */
.sidebar-header {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  padding: var(--spacing-4);
  border-bottom: 1px solid var(--gray-200);
  position: relative;
}

.sidebar-header h3 {
  margin: 0;
  color: var(--gray-800);
  margin-left: 50px;
}

/* 关闭按钮 */
.close-sidebar-btn {
  background: none;
  border: none;
  color: var(--gray-500);
  cursor: pointer;
  padding: var(--spacing-2);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 102;
}

.close-sidebar-btn:hover {
  background: var(--gray-100);
  color: var(--gray-700);
}

/* 侧展栏导航 */
.sidebar-nav {
  flex: 1;
  padding: var(--spacing-4) 0;
}

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

.sidebar-nav li {
  margin-bottom: var(--spacing-2);
}

/* 侧展栏链接 */
.sidebar-link {
  display: flex;
  align-items: center;
  padding: var(--spacing-3) var(--spacing-4);
  border-radius: var(--radius-lg);
  color: var(--gray-700);
  text-decoration: none;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.sidebar-link:hover {
  background: var(--gray-100);
  color: var(--primary);
  transform: translateX(5px);
}

.sidebar-link::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--primary);
  transform: scaleY(0);
  transition: transform var(--transition-normal);
}

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

/* 遮罩层 */
.sidebar-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 99;
  display: none;
  transition: opacity var(--transition-normal);
  opacity: 0;
}

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

/* ===== 友情链接页面样式 ===== */
.friend-links-container {
  padding: var(--spacing-8) 0;
}

.page-header {
  text-align: center;
  margin-bottom: var(--spacing-8);
}

.page-header h1 {
  margin-bottom: var(--spacing-4);
}

.page-header p {
  color: var(--gray-500);
  font-size: 1.125rem;
}

/* 友情链接网格 */
.friend-links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-6);
  margin-bottom: var(--spacing-8);
}

/* 友情链接卡片 */
.friend-link-card {
  background: var(--gradient-card);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-xl);
  padding: var(--spacing-6);
  box-shadow: var(--shadow-elevation-1);
  transition: all var(--transition-smooth);
}

.friend-link-card:hover {
  box-shadow: var(--shadow-elevation-3);
  transform: translateY(-4px);
}

/* 友情链接包装器 */
.friend-link-wrapper {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--gray-800);
}

/* 友情链接图标 */
.friend-link-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-right: var(--spacing-4);
  flex-shrink: 0;
  background: white;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--gray-200);
}

.friend-link-icon img {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

/* 友情链接信息 */
.friend-link-info {
  flex: 1;
  min-width: 0;
}

.friend-link-name {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--spacing-2);
  color: var(--gray-900);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.friend-link-description {
  color: var(--gray-500);
  font-size: 0.875rem;
  line-height: 1.5;
  margin: 0;
}

/* 返回主页按钮 */
.back-to-home {
  text-align: center;
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
  .sidebar {
    width: 50%;
    max-width: 180px;
    left: -100%;
  }
  
  .sidebar.open {
    left: 0;
  }
  
  .sidebar-toggle {
    top: 50%;
    left: 15px;
    transform: translateY(-50%);
    width: 45px;
    height: 45px;
  }
  
  .sidebar-toggle:hover {
    transform: translateY(-50%);
  }
  
  .sidebar-toggle:active {
    transform: translateY(-50%);
  }
  
  .site-header .logo {
    margin-left: 60px;
  }
  
  .friend-links-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-4);
  }
  
  .friend-link-card {
    padding: var(--spacing-4);
  }
}