* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Quicksand', 'Arial', sans-serif;
}

html {
    --ink-color: black;
    --bg-color: white;
    --header-bg: dodgerblue;
    --button-bg: skyblue;
    --button-ink: black;
    --card-bg: #eee;
    --card-border: gainsboro;
    color-scheme: light;
}

@media (prefers-color-scheme: dark) {
    html {
        --ink-color: #ccc;
        --bg-color: #212528;
        --header-bg: #17123D;
        --button-bg: #332B7D;
        --button-ink: white;
        --card-bg: #181818;
        --card-border: #333;
        color-scheme: dark;
    }
    img {
        filter: brightness(0.8) contrast(1.2);
    }
}

body {
    color: var(--ink-color);
    background-color: var(--bg-color);
}

header {
    position: fixed;
    width: 100%;
    background-color: var(--header-bg);
    color: white;
    z-index: 9999;
}

.header-brand {
    text-align: center;
}

.header-brand-img {
    width: 7rem;
    padding: 1rem;
}

.header-cta {
    width: 100%;
}

.header-nav {
    margin: 1rem;
    margin-top: 0;
    text-align: center;
}

.header-nav ul li {
    list-style: none;
}

.header-nav ul li a {
    color: white;
    text-decoration: none;
}

.header-search {
    margin: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.input-group {
    display: flex;
}

.form-input {
    border: 1px solid gainsboro;
    border-left: none;
    border-radius: 4px 0 0 4px;
    padding: 0 10px;
    height: 2rem;
}

.form-button {
    border: 1px solid gainsboro;
    border-right: none;
    border-radius: 0 4px 4px 0;
    padding: 3px 10px;
    background-color: var(--button-bg);
    color: var(--button-ink);
    height: 2rem;
}

main {
    padding-top: 210px;
}

.hero-img {
    width: 100%;
}

article {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 5px;
    margin: 1rem;
    padding: 1.5rem;
}

.article-img {
    width: 100%;
    aspect-ratio: 3/2;
    object-fit: cover;
}

.article-title {
    margin: 1rem 0;
}

footer {
    margin-top: 1rem;
    background-color: var(--header-bg);
    padding: 2rem;
    font-style: italic;
    font-size: 0.9rem;
}

@media (min-width: 768px) {
    .header-cta {
        width: 100%;
        display: flex;
        text-wrap: wrap;
        justify-content: space-between;
    }

    .header-nav {
        margin: 1rem;
        text-align: start;
    }

    .container {
        display: flex;
        flex-wrap: wrap;
    }
    
    .hero-img {
        aspect-ratio: 2/1;
        object-fit: cover;
    }

    article {
        flex: 0 0 calc(50% - 2rem);
    }
}

@media (min-width: 992px) {
    header {
        display: flex;
        justify-content: start;
        align-items: center;
    }

    main {
        padding-top: 100px;
    }

    article {
        flex: 0 0 calc(33.33% - 2rem);
    }
}