:root{font-family:Inter,Arial,sans-serif;color:#0f172a}*{box-sizing:border-box}body{margin:0;background:#f8fafc}.layout{display:grid;grid-template-columns:260px 1fr;min-height:100vh}.sidebar{padding:16px;background:#111827;color:#fff;display:flex;flex-direction:column;gap:14px}.sidebar nav{display:flex;flex-direction:column;gap:8px}.sidebar a{color:#d1d5db;text-decoration:none}.sidebar a.active{color:#fff;font-weight:600}.sidebar button{margin-top:auto}.content{padding:20px}.card{background:#fff;border:1px solid #e2e8f0;border-radius:10px;padding:16px;margin-bottom:12px}.row{display:flex;gap:10px;flex-wrap:wrap}input,textarea,select,button{padding:10px;border:1px solid #cbd5e1;border-radius:8px}button{cursor:pointer}.center{min-height:100vh;display:grid;place-items:center}.auth-box{width:100%;max-width:420px;background:#fff;border:1px solid #e2e8f0;border-radius:12px;padding:20px}.auth-box form{display:grid;gap:10px}@media (max-width: 900px){.layout{grid-template-columns:1fr}}