body.dark { background:#0b1020; color:#e6eef8; font-family:Arial,sans-serif; }
.grid { display:grid; grid-template-columns: repeat(auto-fill,minmax(200px,1fr)); gap:16px; padding:20px; }
.card { background:#1a2238; padding:20px; border-radius:12px; box-shadow:0 4px 10px rgba(0,0,0,0.5); }
a { color:#4da3ff; text-decoration:none; }
input,select,button { width:100%; margin:4px 0; padding:8px; border-radius:6px; border:none; }
button { background:#4da3ff; color:white; cursor:pointer; }
.login-box,.admin-box { max-width:400px; margin:50px auto; background:#1a2238; padding:20px; border-radius:12px; }
.error { color:#ff6b6b; }