body{font-family:Arial,Helvetica,sans-serif;background:#eaf6ff;margin:0}
.site-header{background:#fff;padding:10px 20px;border-bottom:1px solid #ddd}
.header-inner{display:flex;align-items:center;gap:20px}
.sidebar{width:220px;float:left;padding:20px}
.content{margin-left:240px;padding:20px}
.side-menu{list-style:none;padding:0;margin:0}
.side-menu li{margin:8px 0}
.side-menu a{display:block;padding:10px;border-radius:12px;background:#f0f0f0;text-decoration:none;color:#111}
.side-menu a:hover{background:#e0e0e0}
button, input[type=submit]{border-radius:12px;padding:10px 16px;border:none;cursor:pointer;background:#dfeff8}
input, textarea{width:100%;padding:8px;margin:6px 0;border-radius:6px;border:1px solid #ccc}
.site-footer{text-align:center;padding:12px;background:#fff;position:fixed;left:0;right:0;bottom:0;border-top:1px solid #ddd}
.error{color:#a00}
.success{color:#0a0}