style.css

@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@300;400;500;600;700&display=swap');

/* Reset dan Pengaturan Dasar */
body,
html {
    margin: 0;
    padding: 0;
    background: #1d1d1d;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    perspective: 2000px;
    font-family: 'Montserrat', sans-serif;
}

.portfolio-container {
    width: 30vw;
    height: 80vh;
    transform-style: preserve-3d;
    transition: transform 1.2s cubic-bezier(0.77, 0, 0.175, 1);
}

.portfolio-container.zoom-in {
    transform: translateX(40%);
}

.book-3d {
    --book-thickness: 30px;
    --book-width: 30vw;
    --book-height: 80vh;
    width: 100%;
    height: 100%;
    position: relative;
    transform: rotateY(-35deg);
    transform-style: preserve-3d;
    transition: transform 0.5s ease-in-out;
}

.book-3d::before {
    content: '';
    position: absolute;
    top: 2%;
    width: var(--book-thickness);
    height: 96%;
    background: linear-gradient(to right, #e0e0e0, #ffffff);
    transform:
        translateX(calc(var(--book-width) - (var(--book-thickness) / 2))) rotateY(90deg) translateX(calc(var(--book-thickness) / 2));
    transform-origin: left center;
    z-index: 1;
    border-radius: 2px;
}

.book-3d::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* Warna sampul belakang, sedikit lebih gelap */
    background: #d8d7d3;
    border-radius: 5px;
    /* Mendorong sampul belakang ke belakang sejauh ketebalan buku */
    transform: translateZ(calc(-1 * var(--book-thickness)));
    /* Bayangan untuk memberi ilusi kedalaman */
    box-shadow: -10px 0 30px 5px rgba(0, 0, 0, 0.3);
}

.book-3d.hovered {
    transform: rotateY(0deg);
}

.cover-front {
    position: absolute;
    width: 100%;
    height: 100%;
    transform-origin: left center;
    transform: rotateY(0deg) translateZ(15px);
    transition: transform 1s ease;
    z-index: 5;
}

.book-3d.open .cover-front {
    transform: rotateY(-160deg) translateZ(15px);
}

.cover {
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom right, #000, #222);
    border-radius: 5px;
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 10px;
    font-weight: 500;
    font-size: clamp(1rem, 1.2vw, 1.6rem);
    color: white;
    position: relative;
    box-shadow: 0 0 30px rgba(255, 255, 255, 0.1), 0 0 50px rgba(0, 0, 0, 0.5);
    cursor: pointer;
}

.cover::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 5px;
    height: 100%;
    background: linear-gradient(to left, rgba(255, 255, 255, 0.1), transparent);
    border-top-right-radius: 5px;
    border-bottom-right-radius: 5px;
}

.cover {
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom right, #222, #111);
    border-radius: 5px;
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 10px;
    font-weight: 500;
    font-size: clamp(1rem, 1.2vw, 1.6rem);
    color: white;
    position: relative;
    box-shadow: 0 0 30px rgba(255, 255, 255, 0.1), 0 0 50px rgba(0, 0, 0, 0.5);
    transition: background 0.4s ease-out;
}

/* Transisi untuk semua elemen anak */
.cover * {
    transition: opacity 0.3s ease-out;
}

/* Kelas baru untuk mengubah tampilan cover saat buku terbuka */
.cover.plain-inner {
    background: linear-gradient(to bottom right, #333,#000, #222, #555);
}

.cover.plain-inner * {
    opacity: 0;
}

/* Hilangkan pseudo-element yang tidak diperlukan */

.cover-left {
    display: grid;
    grid-template-rows: 2fr 5fr;
    gap: 5%;
    padding: 10px;
    min-height: 0;
}

.cover-title {
    padding: 10px;
    display: grid;
    grid-template-rows: auto 1fr;
}

.cover-image {
    background-color: #111;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

.cover-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: brightness(0.8) contrast(1.2) grayscale(90%);
}

.cover-right {
    position: relative;
}

.quote,
.timeline {
    position: absolute;
    white-space: nowrap;
    transform: rotate(-90deg);
    transform-origin: top right;
    right: 20%;
    font-size: 0.9rem;
    opacity: 0.8;
}

.quote {
    top: 20%;
    font-style: italic;
}

.timeline {
    top: 70%;
}

.inner-pages {
    width: 95%;
    height: 98%;
    background: yellow;
    border-radius: 5px;
    position: absolute;
    transform: translateZ(0px);
    z-index: 1;
    opacity: 0;
    transition: opacity 0.5s ease;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
    overflow: hidden;
    margin-top: 1.4%;
}

.book-3d.open .inner-pages {
    opacity: 1;
}

.inner-pages .page-content {
    display: none;
    height: 100%;
    padding: 20px;
}

.inner-pages .page-content.active {
    display: block;
}

.nav-buttons {
    position: absolute;
    bottom: 10px;
    width: 100%;
    display: flex;
    justify-content: space-between;
    padding: 0 20px;
    box-sizing: border-box;
}

.nav-buttons button {
    background: #000;
    color: white;
    border: 1px solid white;
    padding: 6px 12px;
    border-radius: 3px;
    cursor: pointer;
    font-family: 'Montserrat', sans-serif;
}

.spine {
    position: absolute;
    width: 12px;
    height: 100%;
    left: -6px;
    background: linear-gradient(to right, #111 0%, #333 50%, #111 100%);
    transform: rotateY(90deg);
    transform-origin: right center;
    z-index: 0;
    border-radius: 2px;
    box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.2);
}

.back-cover {
    position: absolute;
    width: 100%;
    height: 100%;
    background: #111;
    border-radius: 5px;
    transform: rotateY(-180deg) translateZ(15px);
    backface-visibility: hidden;
    z-index: -1;
    box-shadow: -3px 0 10px rgba(0, 0, 0, 0.15);
}

.page-layer {
    position: absolute;
    width: 100%;
    height: 100%;
    background: #fdfdfd;
    border-radius: 5px;
    box-shadow: 0 0 3px rgba(0, 0, 0, 0.1);
    transform-origin: left center;
    z-index: 0;
}

.layer-1 {
    transform: translateZ(-2px);
}

.layer-2 {
    transform: translateZ(-4px);
}

.layer-3 {
    transform: translateZ(-6px);
}

/* Media query untuk mobile tetap relevan, namun kita targetkan.book-3d */
@media (max-width: 768px) {
    .book-3d {
        transform: rotateY(0deg);
        /* Di mobile, tampilkan lurus */
        width: 80vw;
        height: 70vh;
    }

    .book-3d:hover {
        transform: rotateY(0deg) scale(1.02);
        /* Efek hover lebih simpel di mobile */
    }

    /* Sembunyikan efek ketebalan di mobile agar tidak aneh */
    .book-3d::before,
    .book-3d::after {
        display: none;
    }

    .cover {
        grid-template-columns: 1fr;
        grid-template-rows: 1fr auto;
        font-size: clamp(1rem, 4vw, 1.4rem);
    }

    .cover-left {
        grid-template-rows: 1fr 2fr;
    }

    .cover-right {
        position: static;
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 10px 20px;
    }

    .quote,
    .timeline {
        position: static;
        transform: none;
        white-space: normal;
        text-align: center;
    }
}