body {
    font-family: 'Montserrat', sans-serif;
    margin: 0;
    background: #f4f4f4;
    color: #333;
}

header {
    background: #111;
    color: #fff;
    padding: 20px;
    text-align: center;
    position: sticky;
    top: 0;
    z-index: 1000;
}

header h1 {
    margin: 0;
    font-weight: 600;
    letter-spacing: 2px;
}

.container {
    max-width: 1200px;
    margin: 30px auto;
    padding: 0 15px;
}

.filters {
    text-align: center;
    margin-bottom: 20px;
}

.filters button {
    background: #111;
    color: #fff;
    border: none;
    padding: 10px 20px;
    margin: 5px;
    border-radius: 5px;
    cursor: pointer;
    font-family: 'Montserrat', sans-serif;
    transition: background 0.3s ease;
}

.filters button:hover,
.filters button.active {
    background: #444;
}

.grid {
    display: flex;
    flex-wrap: wrap;
    margin: -10px;
}

.grid-item {
    width: 25%;
    padding: 10px;
    box-sizing: border-box;
}

.grid-item a {
    display: block;
    position: relative;
    overflow: hidden;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.grid-item img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.4s ease;
}

.grid-item a:hover img {
    transform: scale(1.1);
}

.grid-item a::after {
    content: "Ver foto";
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0,0,0,0.6);
    color: #fff;
    text-align: center;
    padding: 10px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.grid-item a:hover::after {
    opacity: 1;
}

@media (max-width: 992px) {
    .grid-item { width: 33.33%; }
}

@media (max-width: 768px) {
    .grid-item { width: 50%; }
}

@media (max-width: 480px) {
    .grid-item { width: 100%; }
}

.alert {
    background: #ffdddd;
    color: #a00;
    padding: 15px;
    border: 1px solid #a00;
    margin: 20px;
    text-align: center;
    border-radius: 5px;
}