:root {
    /*COLOR PALETTE*/
    /* --- Core Brand --- */
    --color-bg-fill: #333;
    --color-accent: #33c098;
    --color-text: #dadada;
    --color-h-main-color: #d2d2d2;
    --color-h-misc-color: #666;

    /* --- UI & Surface --- */

    --ui-surface: #555555;
    --ui-surface-input: #7e7e7e; /* Hover states for cards */


    /* --- Utility Colors --- */
    --color-success: #5db351;
    --color-warning: #b39451;
    --color-error: #b35151;

    /* --- Interactive Shadings --- */

    --app-accent-glow: rgb(78, 223, 150);
    --app-accent-dim: #268693; /* For "Active/Pressed" states */


    /*TYPOGRAPHY*/
    --font-heading: 'Noto Sans', sans-serif;
    --font-body: 'Noto Sans', sans-serif;
    --font-highlight: 'Noto Sans', sans-serif;

    --font-wght-default-axis: 400;
    --font-wght-heading-axis: 200;
    --font-wdth-default-axis: 60%;
    --font-wdth-heading-axis: 55%;


    --h1-size: 6rem;
    --h1-height: 6.75rem;
    --h2-size: 3.125rem;
    --h2-height: 4.6875rem;

    --h3-size: 2.5rem;
    --h4-size: 2rem;
    --h5-size: 1.75rem;
    --h6-size: 1.375rem;

    --subtitle-size: 0.75rem;
    --subtitle-height: 1.625rem;

    --p-size: 1.125rem;
    --p-height: 1.625rem;

    --secondary-text-size: 0.875rem;
    --secondary-text-height: 1.125rem;

    --button-size: 1rem;

    /*SPACING*/
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 4rem;

    /*App Dimensions*/
    --app-content-width: 65%;
    --app-nav-width: 50px;
    --app-nav-height: auto;

    /*Table Dimensions*/
    --table-template-col: repeat(6, auto);

    /* Dev Dimensions*/
    --temp-length-xs: 0.25rem;
    --temp-length-s: 0.5rem;
    --temp-length-sm: 0.75rem;
    --temp-length-md: 1rem;
    --temp-length-lg: 2rem;
    --temp-length-xl: 4rem;
    --temp-length-xxl: 8rem;

    /*Anime and Transition*/
    --transition-default: 0.3s;
}

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

body {
    /*position: relative;*/
    /*display: flex;*/
    /*flex-direction: column;*/
    /*justify-content: center;*/
    /*align-items: center;*/
    height: 100vh;
    font-family: 'Noto Sans', sans-serif;
    text-align: center;
    color: var(--color-text);
    background-color: var(--color-bg-fill);
}

a {
    text-decoration: none;
    color: #fff;
    transition: color var(--transition-default);

    &:visited {
        color: #fff;
    }

    &:hover {
        cursor: pointer;
        color: var(--color-accent);
    }
}

button {
    position: relative;
    width: 100%;
    font-size: var(--h6-size);
    border: none;
    background: transparent;
    transition: color var(--transition-default);

    &:hover {
        color: var(--color-accent);
        cursor: pointer;
    }
}

footer {
    background-color: var(--main-headfoot-color);
    color: var(--main-text-color);
    text-align: center;
    width: 100%;
    height: 80px;
    margin: 0;
    padding: 0;
    bottom: 0;
    z-index: 10;
    box-shadow: 0 -3px 3px var(--main-headfoot-shadow);
}

footer a {
    color: var(--main-text-color);
}

footer a:hover {
    color: var(--main-accent-color);
}

form {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: flex-start;
    padding: var(--spacing-sm);
    border-radius: var(--spacing-sm);

    button {
        display: block;
        width: 100%;
        /*margin-top: var(--spacing-md);*/
        border-radius: var(--spacing-sm);
        color: var(--color-text);
        background-color: var(--color-accent);

        &:hover {
            color: var(--app-accent-dim);
        }
    }

    h1 {
        margin: 0;
    }

    input {
        display: block;
        width: 100%;
        border: 2px solid var(--color-accent);
        outline: none;
        font-size: var(--p-size);
        color: var(--color-text);
        border-radius: var(--spacing-sm);
        background-color: transparent;

        &:focus {
            border: 2px solid var(--color-warning);
            caret-color: var(--color-accent);
        }
    }

    label {
        display: block;
        width: 100%;
        margin-top: var(--spacing-md);
        padding-left: var(--spacing-sm);
        font-size: var(--subtitle-size);
        text-align: start;
    }

    select {
        display: block;
        width: 100%;
        border: 2px solid var(--color-accent);
        outline: none;
        font-size: var(--p-size);
        color: var(--color-text);
        border-radius: var(--spacing-sm);
        background-color: transparent;
    }
}

h1 {
    margin-top: 2rem;
    font-weight: 200;
    letter-spacing: 0.1rem;
    color: var(--color-h-main-color);
}

h2 {
    font-weight: 300;
    letter-spacing: 0.05rem;
    padding: var(--spacing-lg) 0 var(--spacing-sm);
}

header {
    width: 100%;
    height: 80px;
    top: 0;
    background-color: var(--main-headfoot-color);
    margin: 0;
    padding: 0;
    box-shadow: 0 3px 3px var(--main-headfoot-shadow);
}

header div {
    width: 100%;
    margin: 0;
    padding: 0;
    text-align: center;
}

img {
    width: 32px;
    height: 32px;
}

main {
    position: relative;
    /*height: 100%;*/
    /*width: 100%;*/
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    /*background-image: url("img/pa_bg3.jpg");*/
    /*background-repeat: no-repeat;*/
    /*background-size: contain;*/
    /*background-position: center;*/
}

ul {
    list-style: none;
}

svg {
    display: block;
}

table {
    display: grid;
    width: 100%;
    grid-template-columns: var(--table-template-col);
    font-size: 0.8rem;
    text-align: start;

    thead, tbody, tr {
        display: contents;
    }

    th, td {
        padding: 3px var(--spacing-sm);
    }

    th {
        position: sticky;
        top: 0;
        z-index: 10;
        font-weight: bold;
        text-align: start;
        border-bottom: 2px solid #444;
        background-color: var(--color-bg-fill);
    }

    td {
        border-bottom: 1px solid #666;
    }
}

/*-------------------------------------------------------------------------------------------------------------------*/
.content {
    width: 60%;
}

.content-wide {
    width: 90%;
}

.all-books-wrapper {
    margin-top: 50px;
}

.book-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto 1fr auto;
    grid-template-areas:
            "a a"
            "b c"
            "d d";
    place-items: center;
    width: auto;
    /*margin: 25px 25px;*/
    /*padding: 10px;*/
    border: 2px solid var(--color-accent);
    border-radius: 8px;
}

.book-card .book-title {
    grid-area: a;
    text-align: center;
    font-size: 1.5rem;

    h2 {
        padding: 0;
    }
}

.book-card .book-img {
    grid-area: b;
}

.book-card .book-desc {
    grid-area: c;
}

.book-card .book-download {
    grid-area: d;

    form {
        justify-content: center;
        align-items: center;

        button {
            padding: 0;
        }
    }
}

.book-img img {
    width: 200px;
    height: auto;
}


/*.book-desc {*/

/*}*/

/*.book-download {*/

/*}*/

.header-wrapper {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
}

/*-------------------------------------------------------------------------------------------------------------------*/
#header-nav {
    width: 80%;
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: baseline;
    gap: 64px;
}

#page {
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}