.app-header{box-sizing:border-box;z-index:100;background-color:#fff;justify-content:space-between;align-items:center;width:100%;height:64px;padding:0 5%;display:flex;position:fixed;top:0;left:0;box-shadow:0 2px 6px #00000014}.header-left .logo{color:#1e6fff;letter-spacing:.08em;font-size:22px;font-weight:800;text-decoration:none}.header-right{align-items:center;gap:20px;display:flex}.menu-item{color:#333;padding:4px 0;font-size:14px;text-decoration:none}.menu-item:hover{color:#1e6fff}.language-selector{background-color:#fafafa;border:1px solid #e0e0e0;border-radius:16px;align-items:center;gap:6px;padding:4px 8px;display:flex}.language-icon{font-size:16px}.language-select{color:#333;cursor:pointer;background:0 0;border:none;outline:none;font-size:13px}.page-box{color:#4b5563;width:50%;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;line-height:1.6}.page-box ul{padding-left:20px}.footer{text-align:left;width:100%;margin-top:50px;padding:10px 5%;font-size:12px;text-decoration:none}.footer a{color:#333;text-decoration:none}