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

/* Corpo da página */
body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
}

/* Container principal */
.container {
    width: 80%;
    margin: auto;
    overflow: hidden;
}

/* Cabeçalho */
header {
    background: #333;
    color: #fff;
    padding-top: 30px;
    min-height: 70px;
    border-bottom: #ccc 1px solid;
    position: relative;
}

header h1 {
    text-align: center;
    margin: 0;
}

/* Navegação */
nav {
    text-align: center;
    margin: 20px 0;
}

nav a {
    color: #fff;
    padding: 10px 20px;
    text-decoration: none;
    text-transform: uppercase;
    font-weight: bold;
    display: inline-block;
}

nav a:hover {
    background: #575757;
}

/* Estilos para o formulário */
form {
    background: #fff;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    margin: 20px 0;
}

form label {
    display: block;
    margin-bottom: 10px;
    font-weight: bold;
}

form input[type="text"],
form input[type="email"],
form input[type="password"],
form input[type="number"],
form select,
form textarea {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
}

form input[type="submit"],
form button {
    background: #333;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
}

form input[type="submit"]:hover,
form button:hover {
    background: #575757;
}

/* Estilos para tabelas */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

table th,
table td {
    padding: 10px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

table th {
    background: #f4f4f4;
}

/* Estilos para mensagens de alerta */
.alert {
    padding: 10px;
    margin: 20px 0;
    border-radius: 5px;
    color: #fff;
}

.alert.success {
    background: #4CAF50;
}

.alert.error {
    background: #f44336;
}

.alert.info {
    background: #2196F3;
}

/* Responsividade */
@media (max-width: 768px) {
    .container {
        width: 95%;
    }

    header {
        padding-top: 20px;
    }

    nav a {
        display: block;
        margin-bottom: 10px;
    }
}

@media (max-width: 480px) {
    form input[type="submit"],
    form button {
        width: 100%;
    }
}