*, *::before, *::after {
    box-sizing: border-box;
}
:root {
    font-family: "Kanit", sans-serif;
    line-height: 1.6;
    scroll-behavior: smooth;
    --bg: oklch(99.115% 0.00423 15.765);
    --primary: oklch(28.712% 0.00291 16.71);
    --black: oklch(0% 0 0);
    --white: oklch(100% 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);
}
.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: row;
        list-style: none;
        padding: 0rem;
        margin: 0;
    }
    li {
        background-color: var(--red);
        border-radius: .5em;
        margin: .5em;
        transition: background-color 0.3s ease, border 0.3s ease;
    }
    a {
        display: inline-block;
        padding: 1em 2em;
        text-decoration: none;
        color: var(--white);
        text-align: center;
        transition: color 0.3s ease;
    }
    li:hover {
        background-color: var(--white);
        border: solid 2px var(--red);
        border-radius: .5em;
        a {
            color: var(--red);
        }
    }
}
/* Tablet & desktop (min-width 48em) */
@media screen and (min-width: 48em) {
    header {
        flex-direction: row;
        padding: 1rem;
    }

    header img {
        margin-bottom: 0;
    }

    nav {
        width: auto;
        ul {
            flex-direction: row;
            width: auto;
        }

        li {
            margin: 0.5em;
            width: auto;
        }

        a {
            display: inline-block;
            width: auto;
            padding: 1em 2em;
        }
    }
}
.thank {
    margin-top: 10em;
    border: solid var(--black);
    box-shadow: 0 0 0.2rem var(--black), 0 0 2rem var(--shadow-color);
    background-color: oklch(64.738% 0.23837 27.097);
    color: var(--white);
    font-size: 1.8em;
    font-weight: bold;
    margin-inline: 20em;
    text-align: center;
    padding: 1rem;
    border-radius: 0.5em;
    transition: transform 0.3s ease;
}
.thank:hover {
    transform: scale(1.02);
}
.debug {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    color: var(--white);
    display: none;
    justify-content: center;
    align-items: center;
    background-color: rgba(0, 0, 0, 0.8);
}
.message {
    display: flex;
    margin: 0;
    padding: 0;
    flex-wrap: wrap;
    gap: 2rem;
    li {
        margin-right: 20em;
        padding: 2rem;
        background-color: var(--red);
        font-size: 1.2em;
        color: var(--white);
        border: solid var(--black);
        border-radius: .5em;
        box-shadow: 0 0 0.2rem var(--black), 0 0 2rem var(--black);
        position: relative;
        display: flex;
        flex-direction: row;
        align-items: center;
        transition: box-shadow 0.3s ease;
    }
    li:hover {
        box-shadow: 0 0 0.4rem var(--black), 0 0 3rem var(--black);
    }
}

main {
    max-width: 60rem;
    margin: 2rem auto;
    padding: 2rem;
    background-color: var(--white);
    border-radius: 0.5em;
    box-shadow: 0 0 0.2rem var(--red), 0 0 2rem var(--red);
    transition: box-shadow 0.3s ease;
}
main:hover {
    box-shadow: 0 0 0.4rem var(--red), 0 0 3rem var(--red);
}
h1 {
    text-align: center;
    color: var(--red);
    margin-bottom: 1rem;
    font-size: 2.5rem;
    letter-spacing: 0.05em;
}
p {
    font-size: 1rem;
    margin-bottom: 1.5rem;
    text-align: center;
    color: var(--primary);
}
form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}
label {
    font-weight: bold;
    margin-bottom: 0.5rem;
    display: block;
    color: var(--primary);
    font-size: 1.1rem;
}
input[type="text"],
input[type="email"],
textarea {
    padding: 0.75rem;
    border: 1px solid var(--primary);
    border-radius: 0.25em;
    font-size: 1rem;
    width: 100%;
    box-sizing: border-box;
    background-color: var(--bg);
    color: var(--primary);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
input[type="text"]:focus,
input[type="email"]:focus,
textarea:focus {
    border-color: var(--red);
    outline: none;
    box-shadow: 0 0 0.2rem var(--red);
}
.checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
}
.checkbox-group label {
    font-weight: normal;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}
.checkbox-group input[type="checkbox"] {
    accent-color: var(--red);
    width: 1.2em;
    height: 1.2em;
}
button[type="submit"] {
    background-color: var(--red);
    color: var(--white);
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 0.25em;
    cursor: pointer;
    font-size: 1rem;
    align-self: flex-start;
    transition: background-color 0.3s ease, transform 0.2s ease;
}
button[type="submit"]:hover {
    background-color: oklch(50% 0.2 29.223);
    transform: translateY(-0.125rem);
}
.message.error {
    color: var(--red);
    font-size: 0.9em;
    margin-top: 0.5rem;
    display: block;
    font-style: italic;
}
.message.error.general {
    text-align: center;
    font-weight: bold;
    background-color: oklch(90% 0.1 29.223);
    padding: 0.5rem;
    border-radius: 0.25em;
}
.copy {
    background-color: var(--black);
    color: var(--white);
    padding: 1em;
    text-align: center;
    font-size: 0.9em;
    margin-top: 2rem;
}