* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: Arial, Helvetica, sans-serif;
}

body {
    color: #333;
    background-color: #fff;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    background-color: #186A6F;
    color: white;
    text-align: center;
    padding: 30px 0;
    margin-bottom: 40px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

header h1 {
    font-size: 2.5rem;
    font-weight: bold;
}

#tablero {
    display: grid;
    grid-template-columns: 1fr 1fr;
}

.casilla {
    background-color: #ccc; 
    min-height: 200px;       
    width: 70%; 
    cursor: pointer; 
    border: 2px solid rgb(0, 0, 0);
    margin: 0 auto;
}

.casilla:hover {
    filter: brightness(0.9);
}

footer {
    padding: 20px 0;
    border-top: 1px solid #eee;
    background-color: #fafafa;
    font-size: 0.9rem;
    color: #666;
}

footer address {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    font-style: normal;
}

footer a {
    color: #007BFF;
    text-decoration: none;
}

footer img {
    width: 24px;
    margin-top: 5px;
}