body {
    font-family: Arial, sans-serif;
    background: #f4f4f4;
    margin: 0;
    padding: 0;
}
.container {
    max-width: 400px;
    margin: 40px auto;
    background: #fff;
    padding: 24px 18px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}
h2 {
    text-align: center;
    margin-bottom: 24px;
}
input[type="text"], input[type="password"] {
    width: 100%;
    padding: 10px;
    margin: 8px 0;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
}
.btn {
    width: 100%;
    padding: 12px;
    background: #2196f3;
    color: #fff;
    border: none;
    border-radius: 4px;
    margin: 8px 0;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.2s;
}
.btn:hover {
    background: #1769aa;
}
.btn.logout {
    background: #f44336;
}
.btn.logout:hover {
    background: #b71c1c;
}
.btn.reset {
    background: #ff9800;
}
.btn.reset:hover {
    background: #e65100;
}
.error {
    color: #fff;
    background: #f44336;
    padding: 8px;
    border-radius: 4px;
    margin-bottom: 10px;
    text-align: center;
}
.success {
    color: #fff;
    background: #4caf50;
    padding: 8px;
    border-radius: 4px;
    margin-bottom: 10px;
    text-align: center;
}
@media (max-width: 500px) {
    .container {
        max-width: 98vw;
        padding: 12px 4vw;
    }
    h2 {
        font-size: 20px;
    }
    .btn {
        font-size: 15px;
        padding: 10px;
    }
}