/* ========== 响应式 ========== */
@media (max-width: 1200px) {
  .toc-sidebar,
  .toc-expand-btn {
    display: none !important;
  }

  .main-content {
    margin-right: 0;
  }

  .back-to-top-btn {
    right: 24px;
  }
}

@media (max-width: 768px) {
  .app-container {
    flex-direction: column;
  }

  .site-header {
    position: relative;
    height: 48px;
    padding: 0 12px 0 48px; /* 左侧留出菜单按钮空间 */
    border-bottom: 1px solid var(--border-light);
  }

  .header-content {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    padding: 0;
  }

  .header-left {
    gap: 8px;
    flex: 1;
    min-width: 0; /* 允许收缩 */
  }

  .site-title {
    font-size: 15px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .site-description,
  .header-divider {
    display: none;
  }

  .header-nav {
    gap: 4px;
    flex-shrink: 0;
  }

  .header-nav .nav-link {
    padding: 6px 8px;
    font-size: 12px;
    min-width: auto;
  }

  .header-nav .nav-link svg {
    width: 16px;
    height: 16px;
  }

  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 280px;
    height: 100vh;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 1000;
    box-shadow: var(--shadow-md);
    background: var(--bg-body);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    backdrop-filter: blur(2px);
  }

  .sidebar-overlay.active {
    display: block;
  }

  .mobile-menu-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    position: fixed;
    top: 7px;
    left: 8px;
    z-index: 1001;
    width: 34px;
    height: 34px;
    background: var(--bg-body);
    border: 1px solid var(--border-light);
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-body);
    box-shadow: var(--shadow-sm);
    transition: all 0.15s;
  }

  .mobile-menu-btn:hover {
    background: var(--bg-hover);
  }

  .mobile-menu-btn:active {
    transform: scale(0.95);
  }

  .main-content {
    margin: 0;
    min-height: calc(100vh - 48px - 60px); /* 减去header和footer高度 */
  }

  .view {
    padding: 16px 16px;
    min-height: auto;
  }

  .post-meta {
    gap: 8px;
    flex-wrap: wrap;
  }

  .post-meta .meta-item {
    font-size: 12px;
  }

  .markdown-body {
    font-size: 14px;
    line-height: 1.6;
    padding: 0 4px;
  }

  .markdown-body h1 {
    font-size: 20px;
    margin: 16px 0 12px;
  }

  .markdown-body h2 {
    font-size: 18px;
    margin: 14px 0 10px;
  }

  .markdown-body h3 {
    font-size: 16px;
    margin: 12px 0 8px;
  }

  .markdown-body p {
    margin: 8px 0;
  }

  .markdown-body pre {
    margin: 12px 0;
    border-radius: 6px;
    overflow-x: auto;
  }

  .markdown-body table {
    font-size: 13px;
  }

  .markdown-body img {
    max-width: 100%;
    height: auto;
  }

  .site-footer {
    position: relative;
    height: auto;
    padding: 12px;
    margin-top: auto;
  }

  .footer-content {
    flex-direction: column;
    gap: 6px;
    padding: 0;
    text-align: center;
  }

  .footer-stats {
    font-size: 12px;
  }

  .footer-divider {
    display: none;
  }

  .toc-sidebar,
  .toc-expand-btn {
    display: none !important;
  }

  .back-to-top-btn {
    bottom: 70px !important;
    right: 16px !important;
    width: 40px;
    height: 40px;
    position: fixed !important;
    z-index: 1000;
  }

  .back-to-top-btn svg {
    width: 18px;
    height: 18px;
  }

  /* 移动端表格优化 */
  .markdown-body table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }

  /* 移动端代码块优化 */
  .markdown-body pre code {
    font-size: 12px;
  }

  /* 移动端图片查看器优化 */
  .image-viewer {
    padding: 10px;
  }

  .image-viewer-content {
    max-width: calc(100vw - 20px);
    max-height: calc(100vh - 20px);
  }

  /* 移动端PDF页面优化 */
  .pdf-pages {
    gap: 12px;
    padding: 0 4px;
  }

  .pdf-page-img {
    border-radius: 6px;
  }

  /* 移动端通知优化 */
  .notification {
    left: 10px;
    right: 10px;
    width: auto;
    max-width: none;
  }

  /* 移动端触摸优化 */
  .nav-item-file,
  .nav-item-dir {
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
  }

  .nav-item-file:active,
  .nav-item-dir:active {
    background: var(--bg-active);
  }

  .mobile-menu-btn {
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
  }

  .back-to-top-btn {
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
  }

  /* 移动端滚动优化 */
  .sidebar {
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
  }

  .main-content {
    -webkit-overflow-scrolling: touch;
  }

  /* 移动端首页优化 */
  .home-view .directory-tree {
    padding: 0;
  }

  .home-view .tree-node {
    padding: 8px 12px;
  }

  .home-view .tree-node-content {
    font-size: 14px;
  }

  .home-view .tree-node-icon {
    width: 16px;
    height: 16px;
  }
}

/* 超小屏幕优化 */
@media (max-width: 480px) {
  .site-header {
    padding: 0 8px 0 44px;
  }

  .header-nav .nav-link {
    padding: 4px 6px;
    font-size: 11px;
  }

  .view {
    padding: 12px 12px;
  }

  .markdown-body {
    font-size: 13px;
    padding: 0 4px;
  }

  .markdown-body h1 {
    font-size: 18px;
  }

  .markdown-body h2 {
    font-size: 16px;
  }

  .markdown-body h3 {
    font-size: 15px;
  }

  .sidebar {
    width: 260px;
  }

  .mobile-menu-btn {
    width: 32px;
    height: 32px;
    top: 8px;
    left: 6px;
  }

  .mobile-menu-btn svg {
    width: 18px;
    height: 18px;
  }
}