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

    body {
        font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
        background-color: #f9fafb;
        padding: 30px 20px;
        color: #1f2937;
    }

    .container {
        max-width: 1200px;
        margin: 0 auto;
        background: white;
        border-radius: 28px;
        box-shadow: 0 12px 30px rgba(0,0,0,0.05);
        padding: 30px 24px 48px;
    }

    h3 {
        font-size: 24px;
        text-align: center;
        margin-top: 20px;
        margin-bottom: 16px;
        font-weight: 600;
        color: #111827;
    }

    p, li {
        font-size: 16px;
        line-height: 1.6;
        color: #2c3e4f;
    }

    .container table {
        width: 100%;
        border-collapse: collapse;
        margin: 15px 0;
        font-size: 16px;
        background: #fff;
        border: 2px solid #333;
    }

    .container th,
    .container td {
        border: 1px solid #ddd;
        padding: 12px 15px;
        text-align: left;
        vertical-align: top;
    }

    .container th {
        background-color: #f1f5f9;
        color: #1f2937;
        font-weight: 600;
    }

    .btn {
        display: inline-block;
        padding: 12px 28px;
        background-color: #007BFF;
        color: #fff;
        text-decoration: none;
        font-size: 16px;
        margin-top: 20px;
        border-radius: 40px;
        font-weight: 500;
        transition: background 0.2s ease;
        box-shadow: 0 2px 6px rgba(0,123,255,0.2);
    }

    .btn:hover {
        background-color: #0056b3;
        text-decoration: none;
    }

    .texture-colors-section {
        margin: 40px 0 30px;
    }

    .section-title {
        font-size: 28px;
        font-weight: 700;
        text-align: center;
        margin: 40px 0 20px;
        letter-spacing: -0.3px;
        color: #0a2540;
    }

    .texture-category {
        margin-bottom: 40px;
    }

    .texture-category-title {
        font-size: 22px;
        font-weight: 700;
        margin: 24px 0 20px;
        padding-left: 12px;
        border-left: 5px solid #007BFF;
        color: #1e293b;
    }

    .texture-colors-grid {
        display: flex;
        flex-wrap: wrap;
        gap: 20px;
        justify-content: flex-start;
        align-items: center;
    }

    .texture-color-item {
        text-align: center;
        width: 100px;
    }

    .texture-color-image {
        width: 100%;
        aspect-ratio: 1 / 1;
        object-fit: cover;
        border-radius: 50%;
        box-shadow: 0 8px 18px rgba(0,0,0,0.1);
        background-color: #eef2f6;
        display: block;
        cursor: pointer;
    }

    .texture-color-name {
        margin-top: 10px;
        font-size: 14px;
        font-weight: 500;
        color: #334155;
    }

    .image-row {
        display: flex;
        flex-direction: row;
        flex-wrap: wrap;
        gap: 30px;
        justify-content: flex-start;
        align-items: flex-start;
        margin-top: 20px;
        margin-bottom: 10px;
    }
    
    .image-col {
        flex: 1;
        min-width: 250px;
    }
    
    .image-col img {
        display: block;
        width: 100%;
        height: auto;
        border-radius: 12px;
        box-shadow: 0 8px 18px rgba(0,0,0,0.1);
        cursor: pointer;
        object-fit: cover;
        aspect-ratio: 4 / 3;
    }

    @media (max-width: 700px) {
        .texture-color-item { width: 75px; }
        .texture-color-name { font-size: 12px; }
        .container { padding: 20px 16px; }
        .btn { font-size: 14px; padding: 10px 20px; }
        .image-row { gap: 20px; }
        .image-col { min-width: 100%; }
    }

    .lightbox-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.9);
        z-index: 99999;
        display: flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        opacity: 0;
        transition: opacity 0.3s ease;
        visibility: hidden;
    }
    
    .lightbox-overlay.active {
        opacity: 1;
        visibility: visible;
    }
    
    .lightbox-content {
        max-width: 90%;
        max-height: 90%;
    }
    
    .lightbox-content img {
        max-width: 100%;
        max-height: 90vh;
        object-fit: contain;
        border-radius: 8px;
        box-shadow: 0 0 30px rgba(0,0,0,0.3);
    }
    
    .close-lightbox {
        position: absolute;
        top: 20px;
        right: 40px;
        color: white;
        font-size: 40px;
        font-weight: bold;
        cursor: pointer;
        z-index: 100000;
    }
    
    .close-lightbox:hover {
        color: #ccc;
    }