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

/* BODY */
body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: #f2f2f2;
    color: #222;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 30px;
}

/* CONTENEDORES */
main,
form,
body > div {
    background-color: #ffffff;
    padding: 25px 30px;
    border-radius: 6px;
    width: 100%;
    max-width: 450px;
    margin-bottom: 20px;
    border: 1px solid #ddd;
}

/* CABECERAS */
header {
    margin-bottom: 20px;
    text-align: center;
}

h1 {
    font-size: 1.8rem;
    margin-bottom: 15px;
}

h2 {
    font-size: 1.4rem;
    margin-bottom: 10px;
}

h3, h4 {
    margin-bottom: 8px;
}

/* TEXTO */
p {
    margin-bottom: 6px;
}

/* LINKS */
a {
    color: #0066cc;
    text-decoration: none;
    font-weight: bold;
}

a:hover {
    text-decoration: underline;
}

/* FORMULARIOS */
form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

form div {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

label {
    font-size: 0.9rem;
    font-weight: bold;
}

/* INPUTS */
input[type="text"],
input[type="password"],
input[type="email"],
input[type="tel"] {
    padding: 8px 10px;
    font-size: 0.95rem;
    border-radius: 4px;
    border: 1px solid #aaa;
}

input:focus {
    outline: none;
    border-color: #0066cc;
}

/* CHECKBOX */
input[type="checkbox"] {
    margin-right: 6px;
}

form div:has(input[type="checkbox"]) {
    flex-direction: row;
    align-items: center;
}

/* BOTÓN */
input[type="submit"] {
    padding: 10px;
    font-size: 1rem;
    background-color: #0066cc;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

input[type="submit"]:hover {
    background-color: #004c99;
}

/* LISTADOS */
body > div h2 {
    margin-top: 10px;
    color: #0066cc;
}

body > div h4 {
    font-weight: normal;
    margin-left: 10px;
}

/* MENSAJES */
h1 {
    text-align: center;
}

/* RESPONSIVE */
@media (max-width: 500px) {
    body {
        padding: 15px;
    }

    main,
    form {
        padding: 20px;
    }
}