/* ===== 13-client-grid.css —— 客户端门户网格（源自 part3 内联样式） ===== */
  .client-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;align-items:start;}
  @media (max-width:900px){.client-grid{grid-template-columns:1fr;}}