html, body {
    height: 100%;
    margin: 0;
    padding: 0;
}

body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    font-family: 'Segoe UI', sans-serif;
    background: linear-gradient(to bottom, #f0f4ff, #d9e4ff);
    text-align: center;
}

header {
    background-color: #1d3557;
    color: white;
    padding: 20px;
}

main {
    flex: 1;
    padding: 40px 20px;
    background-color: transparent;
}

footer {
    background-color: #1d3557;
    color: white;
    text-align: center;
    padding: 15px;
}

.galeria {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
    max-width: 1200px;
    margin: 0 auto;
}

.imagen {
    background-color: #ffffff;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    padding: 10px;
    transition: transform 0.3s;
}

.imagen:hover {
    transform: translateY(-5px);
}

.imagen img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.imagen p {
    font-weight: bold;
    margin: 10px 0 5px 0;
}

button {
    background-color: #457b9d;
    color: white;
    border: none;
    padding: 10px 18px;
    margin-bottom: 10px;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #1d3557;
}