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

body {
    font-family: Arial, sans-serif;
    background-color: #1a1a1a;
    color: #e0e0e0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.categories {
    text-align: center;
    margin-bottom: 20px;
    position: relative;
}

.more-btn {
    display: none;
    padding: 8px 16px;
    margin: 0 5px;
    border: none;
    border-radius: 4px;
    background-color: #2d2d2d;
    color: #e0e0e0;
    cursor: pointer;
    transition: all 0.3s ease;
}

.more-btn:hover {
    background-color: #3d3d3d;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background-color: #2d2d2d;
    border-radius: 4px;
    padding: 10px;
    margin-top: 5px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    z-index: 100;
}

.dropdown-menu.active {
    display: block;
}

@media (max-width: 768px) {
    .category-btn.hide-on-mobile {
        display: none;
    }
    .more-btn {
        display: inline-block;
    }
}

.category-btn {
    padding: 8px 16px;
    margin: 0 5px;
    border: none;
    border-radius: 4px;
    background-color: #2d2d2d;
    color: #e0e0e0;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    transform-origin: center;
}

.category-btn:hover {
    background-color: #3d3d3d;
    transform: scale(1.05);
    box-shadow: 0 2px 8px rgba(0, 102, 204, 0.2);
}

.category-btn.active {
    background-color: #0066cc;
    color: #fff;
    transform: scale(1.05);
    box-shadow: 0 2px 12px rgba(0, 102, 204, 0.4);
}

.category-btn:active {
    transform: scale(0.95);
    box-shadow: 0 1px 4px rgba(0, 102, 204, 0.2);
}

.waterfall {
    column-count: 4;
    column-gap: 15px;
}

@media (max-width: 1200px) {
    .waterfall {
        column-count: 3;
    }
}

@media (max-width: 768px) {
    .waterfall {
        column-count: 2;
    }
}

@media (max-width: 480px) {
    .waterfall {
        column-count: 1;
    }
}

.waterfall-item {
    break-inside: avoid;
    margin-bottom: 15px;
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.3s ease;
    background-color: #2d2d2d;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.waterfall-item:hover {
    transform: scale(1.02);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.waterfall-item img {
    width: 100%;
    height: auto;
    display: block;
}

.preview-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.95);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.preview-modal.active {
    display: flex;
}

.preview-modal img {
    max-width: 90%;
    max-height: 90vh;
    object-fit: contain;
    border-radius: 4px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
}

.close-btn {
    position: absolute;
    top: 20px;
    right: 30px;
    color: #e0e0e0;
    font-size: 40px;
    cursor: pointer;
    transition: color 0.3s ease;
}

.close-btn:hover {
    color: #fff;
}