body {
    background: linear-gradient(135deg, #2c3e50, #3498db);
    font-family: 'Segoe UI', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}
.login-box {
    background: #fff;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.3);
    width: 300px;
}
.login-box h2 {
    text-align: center;
    margin-bottom: 1.5rem;
    color: #2c3e50;
}
.login-box input {
    width: 100%;
    padding: 0.75rem;
    margin-bottom: 1rem;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-size: 1rem;
}
.login-box button {
    width: 100%;
    padding: 0.75rem;
    background: #3498db;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    cursor: pointer;
}
.login-box button:hover {
    background: #2980b9;
}
.error {
    color: red;
    text-align: center;
    margin-bottom: 1rem;
}