* {
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: #ffffff; /* Fondo blanco */
    color: #000000;      /* Texto negro */
}

/* HEADER */
header {
    background: #2e7d32; /* Verde fuerte */
    color: #ffffff;
    padding: 15px;
    text-align: center;
}

/* NAVBAR */
nav {
    background: #388e3c; /* Verde medio */
    padding: 8px;
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
}

nav a {
    color: #ffffff;
    padding: 8px 10px;
    text-decoration: none;
    font-size: 14px;
    background: rgba(255,255,255,0.15);
    border-radius: 4px;
}

nav a:hover {
    background: rgba(255,255,255,0.3);
}

/* CONTENIDO */
main {
    padding: 15px;
}

h2, h3 {
    margin-top: 0;
    color: #000000;
}

/* FORMULARIOS */
form {
    margin-bottom: 15px;
    background: #e8f5e9; /* Verde muy claro */
    padding: 10px;
    border-radius: 4px;
    border: 1px solid #a5d6a7;
}

form label {
    margin-right: 10px;
    color: #000000;
}

form input, form select, form button {
    margin: 5px 5px 5px 0;
    padding: 5px 8px;
    font-size: 14px;
}

/* TABLAS */
table {
    width: 100%;
    border-collapse: collapse;
    background: #ffffff;
    margin-top: 10px;
}

table th, table td {
    border: 1px solid #ccc;
    padding: 6px;
    font-size: 13px;
    color: #000000;
}

table th {
    background: #c8e6c9; /* Verde claro */
    text-align: left;
}

/* FOOTER */
footer {
    background: #2e7d32; /* Verde fuerte */
    color: #ffffff;
    text-align: center;
    padding: 10px;
    margin-top: 20px;
}

/* Responsive */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
    }
    table th, table td {
        font-size: 12px;
    }
}