*, *::before, *::after {
    box-sizing: border-box;
}
:root {
    font-family: "Kanit", sans-serif;
    line-height: 1.6;
    scroll-behavior: smooth;
    --primary: oklch(28.712% 0.00291 16.71);
    --black: oklch(20% 0 0);
    --white: oklch(95% 0 0);
    --red: oklch(62.793% 0.25768 29.223);
    --shadow-color: oklch(33.289% 0.00004 271.152);
    background-color: var(--bg);
    color: var(--primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

:root.dark {
    --bg: oklch(20% 0.01 240);
    --primary: oklch(95% 0.01 60);
    --black: oklch(95% 0 0);
    --white: oklch(10% 0 0);
    --red: oklch(70% 0.2 29.223);
    --shadow-color: oklch(50% 0.01 271.152);
}

.container {
    max-width: 80rem;   
    margin-inline: auto;
    padding-inline: 1rem;
}
header {
    background-color: var(--black);
    box-shadow: 0 0 0.2rem var(--black), 0 0 2rem var(--shadow-color);
    margin-bottom: 1rem;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
    img {
        height: 3rem;
        width: auto;
        border-radius: .5em;
        transition: border 0.3s ease;
    }
    img:hover {
        border: solid 2px var(--white);
    }
}
nav {
    ul {
        display: flex;
        flex-wrap: wrap;
        flex-direction: column;
        list-style: none;
        padding: 0rem;
        margin: 0;
    }
    li {
        background-color: var(--red);
        border-radius: .5em;
        margin: .5em;
        transition: background-color 0.2s ease, border 0.2s ease;
    }
    a {
        display: inline-block;
        padding: 1em 2em;
        text-decoration: none;
        color: var(--white);
        text-align: center;
        transition: color 0.2s ease;
    }
    li:hover {
        background-color: var(--white);
        border: solid 2px var(--red);
        border-radius: .5em;
        a {
            color: var(--red);
        }
    }
    button#theme-toggle {
        width: auto;
        background-color: var(--red);
        color: var(--white);
        border: none;
        padding: 1em 2em;
        border-radius: .5em;
        cursor: pointer;
        transition: background-color 0.2s ease, color 0.2s ease;
    }
    button#theme-toggle:hover {
        background-color: var(--white);
        color: var(--red);
        border: solid 2px var(--red);
    }
}
@media screen and (min-width: 48em) {
    header {
        flex-direction: row;
        padding: 1rem;
        img {
            margin-bottom: 0;
        }
    }
    nav {
        width: auto;
        ul {
            flex-direction: row;
            width: auto;
            padding: 0;
            margin: 0;
        }
        li {
            margin: .5em;
            width: auto;
        }
        a {
            display: inline-block;
            width: auto;
            padding: 1em 2em;
        }
    }
    main, footer {
        .cards {
            flex-direction: row;
            gap: 2rem;
            li {
                width: 33.33%;
                margin-inline: auto;
                img {
                    width: 60%;
                    margin-block: 0;
                }
                p {
                    text-align: left;
                    margin-block: 0;
                }
            }
        }
        footer .cards {
            flex-direction: row;
            gap: 2rem;
            li {
                width: 33.33%;
                max-width: none;
                margin-inline: auto;
            }
        }
        .intro {
            img {
                width: auto;
                max-width: 100%;
                margin: 2em auto;
            }
        }
    }
}
main, footer {
    .intro {
        text-align: center;
        margin-bottom: 2rem;
        img {
            display: block;
            margin: 2em auto;
            border-radius: 50%;
            border: solid 0.125rem var(--black);
            box-shadow: 0 0 0.2rem var(--black), 0 0 2rem var(--shadow-color);
            max-width: 12.5rem;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        img:hover {
            transform: scale(1.05);
            box-shadow: 0 0 0.4rem var(--red), 0 0 3rem var(--red);
        }
        a {
            text-decoration: none;
            background-color: var(--red);
            color: var(--white);
            border-radius: .5em;
            padding: .5em 1em;
            margin-left: .5em;
            transition: background-color 0.3s ease, color 0.3s ease, border 0.3s ease;
        }
        a:hover {
            background-color: var(--white);
            color: var(--red);
            border: solid 2px var(--red);
        }
    }
    .cards {
        display: flex;
        margin: 0;
        padding: 0;
        list-style: none;
        flex-wrap: wrap;
        gap: 2rem;
        @media screen and (max-width: 48em) {
            flex-direction: column;
            gap: 1rem;
        }
        li {
            background-color: var(--white);
            border: solid var(--black);
            border-radius: .5em;
            box-shadow: 0 0 0.2em var(--black), 0 0 2em var(--black);
            overflow: hidden;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            position: relative;
            display: flex;
            flex-direction: column;
            align-items: center;
            width: calc(33.33% - 2rem / 3);
            padding: 1rem;
            @media screen and (max-width: 48em) {
                width: 100%;
                margin-inline: 0;
                img {
                    width: 80%;
                    max-width: 20rem;
                    margin-block: 1rem;
                }
                p {
                    text-align: center;
                    margin-block: 0.5rem;
                }
            }
            p {
                padding: 1rem;
                font-weight: bold;
                text-align: center;
            }
            img {
                width: 100%;
                height: auto;
                border-radius: 0.5em;
                margin-bottom: 1rem;
            }
            .content {
                padding: 1rem;
                text-align: center;
            }
        }
        li:hover {
            transform: scale(1.05);
            box-shadow: 0 0 1em var(--red);
        }
    }
    img {
        height: auto;
    }
    .content {
        padding: 1rem;
    }
    .overlay-link {
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        display: flex;
        justify-content: center;
        align-items: center;
        background-color: rgba(0, 0, 0, 0.5);
        color: var(--white);
        text-decoration: none;
        font-weight: bold;
        opacity: 0;
        transition: opacity 0.3s ease;
        text-indent: 0;
    }
    .cards li:hover .overlay-link {
        opacity: 1;
    }
    h2 {
        margin-block: 1rem;
        text-align: center;
        color: var(--black);
    }
    .copy {
        background-color: var(--black);
        color: var(--white);
        padding: 1em;
        text-align: center;
        margin-top: 2rem;
    }
}