body {
    background-color: #0d0d0d;
    color: #f2f2f2;
    font-family: 'Segoe UI', sans-serif;
    margin: 0;
    padding: 0;
}
.login-box {
    max-width: 400px;
    margin: 100px auto;
    background: #1c1c1c;
    padding: 30px;
    border-radius: 10px;
    text-align: center;
}
.login-box input, .login-box button {
    width: 90%;
    padding: 10px;
    margin: 10px 0;
    border: none;
    border-radius: 5px;
}
.login-box button {
    background: gold;
    color: black;
    font-weight: bold;
}
.error {
    color: red;
}
.top-bar {
    background: #111;
    padding: 10px;
    text-align: center;
}
.logout-btn {
    float: right;
    color: red;
    margin-right: 20px;
    text-decoration: none;
}
.container {
    padding: 20px;
}
.card {
    background: #1f1f1f;
    margin-bottom: 20px;
    padding: 20px;
    border-left: 5px solid gold;
    border-radius: 10px;
}