body {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, sans-serif;
    background: #f0f2f5;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    min-height: 100vh;
    padding: 2rem 1rem;
}

.logo img {
    max-width: 150px;
    height: auto;
    margin-bottom: 1rem;
}

.login-container {
    background: #fff;
    padding: 2rem 2.5rem;
    border-radius: 10px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
    max-width: 400px;
    width: 100%;
    text-align: center;
}

h1 {
    font-size: 1.75rem;
    color: #333;
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    text-align: left;
}

.form-group {
    margin-bottom: 1.25rem;
    text-align: left;
}

input[type="text"],
input[type="password"] {
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: 1rem;
    border: 1.5px solid #ccc;
    border-radius: 6px;
    margin-top: 5px;
}

input[type="submit"] {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
    background-color: #4a90e2;
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s;
}

input[type="submit"]:hover {
    background-color: #357abd;
}

.error-message {
    color: red;
    font-size: 0.9rem;
    margin-top: 1rem;
}

@media (max-width: 480px) {
    .logo img {
        max-width: 100px;
    }

    .login-container {
        padding: 1.5rem 1.5rem;
    }

    h1 {
        font-size: 1.25rem;
    }

    input[type="text"],
    input[type="password"],
    input[type="submit"] {
        font-size: 0.95rem;
        padding: 0.5rem 0.6rem;
        width: 90%;
        margin: 0 auto;
        display: block;
    }
}