/* fonts */
@font-face {
    font-family: 'ChosunGu';
    src:
        url('../fonts/ChosunGu.woff2') format('woff2'),
        url('../fonts/ChosunGu.woff') format('woff');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
    unicode-range: U+AC00-D7AF, U+1100-11FF, U+3130-318F, U+A960-A97F, U+D7B0-D7FF;
}

/* handbook */
#handbook {
    overflow-y: scroll;
    background-color: black;
    word-break: keep-all;
}

#handbook .section {
    align-items: center;
    width: 100%;
    overflow-x: hidden;
}

#handbook .wrapper {
    width: 80%;
    padding: 5rem 2rem 5rem 0;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

#handbook .page-image {
    width: 100%;
    object-fit: contain;
    filter: contrast(120%) brightness(100%);
}

/* First image - centered in viewport */
#handbook .wrapper:nth-child(2) {
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100dvh;
    padding: 0;
}

#handbook .wrapper:nth-child(2) .page-image {
    max-width: 90vw;
    max-height: 90vh;
    width: auto;
    height: auto;
    object-fit: contain;
}

#handbook .hand-left, #handbook .hand-right {
    position: absolute;
    width: 35%;
    filter: contrast(130%) brightness(80%) sepia(40%) opacity(0.2);
    transition: filter 0.3s ease-in-out;
    cursor: pointer;
}

#handbook .hand-left:hover, #handbook .hand-right:hover {
    filter: contrast(130%) brightness(80%) sepia(40%) opacity(1);
}

#handbook .hand-left {
    left: -25px;
}

#handbook .hand-right {
    right: -25px;
}

#handbook .center-text {
    position: fixed;
    width: 75%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);

    padding: 4rem 2rem;
    border-radius: 50%;

    background: linear-gradient(180deg, transparent, 20%, black, 80%, transparent);
    color: white;

    font-family: 'ChosunGu', sans-serif;
    font-weight: 400;
    font-size: 2rem;

    text-align: center;
    line-height: 1.5;

    z-index: 1000;
    pointer-events: none;
    opacity: 1;
    transition: opacity 0.3s ease-in-out;
}

#handbook .center-text.hidden {
    opacity: 0;
}

#wrapper-18 .hand-right,
#wrapper-19 .hand-right,
#wrapper-20 .hand-right,
#wrapper-21 .hand-right {
    right: -75px;
}

@media screen and (max-width: 600px) {
    #handbook .wrapper {
        width: 100%;
        padding: 5rem 1rem 5rem 0;
    }

    #wrapper-18 .hand-right,
    #wrapper-19 .hand-right,
    #wrapper-20 .hand-right,
    #wrapper-21 .hand-right {
        right: -25px;
    }

    #handbook .center-text {
        width: 90%;
        font-size: 1.2rem;
    }
}