/* Basic CSS Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    background-color: rgb(249, 249, 249);
    color: #333;
    padding: 0;
}

a {
    color: currentColor;
}

main > h1, main > section, footer > nav {
    max-width: 1200px;
    margin: auto;
    padding: 20px;
    display: block;
}

header {
    background-color: rgb(255, 174, 9);
    text-align: center;
    -webkit-box-shadow: 0 5px 5px 0 rgba(0, 0, 0, 0.2);
    -moz-box-shadow: 0 5px 5px 0 rgba(0, 0, 0, 0.2);
    box-shadow: 0 5px 5px 0 rgba(0, 0, 0, 0.2);
}

footer {
    background: linear-gradient(to bottom, rgb(62, 80, 17), rgb(48, 61, 13));
    text-align: center;
}

main > h1 {
    text-align: center;
    padding: 40px 20px 0;
}

h2 {
    color: #74941f;
    margin: 25px 0 15px;
}

h3 {
    margin: 15px 0 10px;
}

.partner {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 60px;
    list-style: none;
    padding: 0;
    margin: 0;
    max-width: 1200px;
}

.partner li {
    width: 100%;
}

.partner li a {
    display: block;
    text-align: center;
    padding-bottom: 10px;
    text-decoration: none;
    color: currentColor;
    border: 1px solid #ccc;
    background: #fff;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.partner li a:before {
    display: block;
    width: 100%;
    height: 170px;
    background-color: #fff;
    background-size: 90% auto;
    background-repeat: no-repeat;
    background-position: center;
    overflow: hidden;
    content: '';
}

.partner li a:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

/* Set specific background images for each link */
.partner li:nth-child(1) a:before {
    background-image: url('../assets/partner/DTV_Klassifizierung_Logo-300x143.jpg');
}

.partner li:nth-child(2) a:before {
    background-image: url('../assets/partner/btg.png');
}

.partner li:nth-child(3) a:before {
    background-image: url('../assets/partner/Eifel_Logo_500x300-3203633393-e1674234197586.jpg');
}

.partner li:nth-child(4) a:before {
    background-image: url('../assets/partner/tourismus-nrw_-_logo-e1520350111794-300x138.png');
}

/* Modern browsers with WebP support */
@supports (background-image: url('image.webp')) {
    .partner li:nth-child(1) a:before {
        background-image: url('../assets/partner/DTV_Klassifizierung_Logo-300x143.webp');
    }

    .partner li:nth-child(2) a:before {
        background-image: url('../assets/partner/btg.webp');
    }

    .partner li:nth-child(3) a:before {
        background-image: url('../assets/partner/Eifel_Logo_500x300-3203633393-e1674234197586.webp');
    }

    .partner li:nth-child(4) a:before {
        background-image: url('../assets/partner/tourismus-nrw_-_logo-e1520350111794-300x138.webp');
    }
}

main ul {
    padding-left: 30px;
}

footer {
    margin-top: 30px;
    text-transform: uppercase;
    font-size: 0.9rem;
}

footer ul {
    list-style: none;
    color: #fff;
    text-align: center;
    padding: 10px 0;
}

footer li {
    display: inline;
    margin: 0 30px 0 0;
}

footer li:last-child {
    margin-right: 0;
}

footer a {
    color: currentColor;
    text-decoration: none;
}

#portrait {
    float: right;
    margin-left: 30px;
    border: 1px solid #ccc;
}

/* Responsive */
@media (max-width: 800px) {
    #portrait {
        width: 200px;
        height: 150px;
    }

    .partner {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
        width: 100%;
        max-width: 800px;
    }

    header img {
        width: 150px;
        height: auto;
    }
}

@media (max-width: 480px) {
    #portrait {
        float: none;
        width: 100%;
        height: auto;
        margin: 0 0 30px;
    }
}

@media (max-width: 360px) {
    .partner {
        grid-template-columns: 1fr;
        gap: 20px;
        max-width: 360px;
    }

    h1 {
        font-size: 1.5rem;
    }

    h2 {
        font-size: 1.4rem;
    }

    h3 {
        font-size: 1.3rem;
    }

    footer li {
        display: block;
        margin: 10px 0;
    }
}