* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #ffffff;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    padding: 20px 40px;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
}

#btnEntrar {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 12px 30px;
    font-size: 16px;
    font-weight: bold;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

#btnEntrar:hover {
    background-color: #0056b3;
}

main {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.content h1 {
    font-size: 3rem;
    color: #333;
    text-align: center;
    font-weight: 300;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
    background-color: #fefefe;
    margin: 10% auto;
    padding: 30px;
    border-radius: 10px;
    width: 90%;
    max-width: 400px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover,
.close:focus {
    color: #000;
}

.modal-content h2 {
    margin-bottom: 20px;
    color: #333;
    text-align: center;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: #555;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 14px;
}

.form-group input:focus {
    outline: none;
    border-color: #007bff;
}

form button[type="submit"] {
    width: 100%;
    background-color: #28a745;
    color: white;
    border: none;
    padding: 12px;
    font-size: 16px;
    font-weight: bold;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

form button[type="submit"]:hover {
    background-color: #218838;
}

.erro {
    color: #dc3545;
    margin-top: 10px;
    text-align: center;
    font-size: 14px;
}

@media (max-width: 768px) {
    .content h1 {
        font-size: 2rem;
        padding: 0 20px;
    }
}