/* style.css (Versi Final Lengkap - 29 Juni 2025) */

/* General Styling */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --background-color: #f4f6f9;
    --card-bg-color: #ffffff;
    --text-color: #34495e;
    --nav-height: 70px;
    --shadow: 0 4px 15px rgba(0,0,0,0.1);
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding-top: var(--nav-height); /* Beri ruang untuk navbar fixed */
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* -- Main Navigation Bar -- */
.navbar {
    height: var(--nav-height);
    background-color: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.nav-logo {
    font-size: 22px;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.menu-wrapper {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 25px;
}

.nav-link {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    display: flex;
    align-items: center;
    gap: 5px;
}

.nav-link:hover, .nav-link.active {
    color: var(--secondary-color);
}

/* Dropdown di dalam Nav */
.dropdown-nav {
    position: relative;
}

.dropdown-content {
    display: none;
    position: absolute;
    top: 150%; /* Posisi di bawah menu */
    left: 0;
    background-color: white;
    min-width: 200px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.15);
    z-index: 1;
    border-radius: 8px;
    padding: 5px 0;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.dropdown-nav:hover .dropdown-content {
    display: block;
    opacity: 1;
    visibility: visible;
    top: 100%;
}

.dropdown-content a {
    color: var(--text-color);
    padding: 10px 15px;
    text-decoration: none;
    display: block;
    font-weight: 400;
}

.dropdown-content a:hover {
    background-color: #f1f1f1;
}

.dropdown-content a.active {
    background-color: var(--secondary-color);
    color: white;
}

/* Search di dalam Nav */
.search-container-nav {
    position: relative;
}

#searchInput {
    width: 200px;
    padding: 8px 15px;
    border-radius: 20px;
    border: 1px solid #ddd;
    font-size: 14px;
    outline: none;
    transition: all 0.3s ease;
}
#searchInput:focus {
    width: 250px;
    border-color: var(--secondary-color);
}

/* Hamburger Menu */
.hamburger {
    display: none;
    cursor: pointer;
}
.bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    background-color: var(--primary-color);
    transition: all 0.3s ease-in-out;
}

/* Konten Halaman */
.page-content {
    display: none;
    animation: fadeIn 0.5s;
}
.page-content.active {
    display: block;
}

/* Loader Lingkaran (Disembunyikan) */
.loader {
    border: 8px solid #f3f3f3;
    border-top: 8px solid var(--secondary-color);
    border-radius: 50%;
    width: 60px;
    height: 60px;
    animation: spin 1s linear infinite;
    margin: 50px auto;
    display: none; /* Sembunyikan loader ini karena sudah ada skeleton */
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Book Gallery */
#home-page {
    padding-top: 20px;
}
.book-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
    padding: 20px 0;
}

/* Halaman Tentang */
.about-container {
    padding-top: 40px;
    padding-bottom: 40px;
    max-width: 800px;
}
.about-container h2, .about-container h3 {
    color: var(--primary-color);
}
.about-container ul {
    list-style-type: disc;
    padding-left: 20px;
}

/* Modal PDF Viewer */
.modal{display:none;position:fixed;z-index:2000;left:0;top:0;width:100%;height:100%;background-color:rgba(0,0,0,.85);animation:fadeIn .3s}.modal.visible{display:flex;align-items:center;justify-content:center;padding:20px}@keyframes fadeIn{from{opacity:0}to{opacity:1}}.modal-content{background-color:#fefefe;border-radius:10px;width:90%;max-width:900px;max-height:95vh;box-shadow:0 5px 20px rgba(0,0,0,.4);position:relative;display:flex;flex-direction:column;margin:auto;overflow:hidden}.close-button{color:#fff;background-color:rgba(0,0,0,.5);border-radius:50%;position:absolute;top:-15px;right:-15px;width:35px;height:35px;font-size:25px;line-height:35px;text-align:center;font-weight:700;cursor:pointer;z-index:10}#pdf-viewer-container{flex-grow:1;overflow-y:auto;padding:10px;text-align:center;line-height:0}#pdf-canvas{border:1px solid #ccc;box-shadow:var(--shadow);max-width:100%;height:auto}.pdf-controls{text-align:center;padding:10px 15px;background-color:#f1f1f1;border-bottom-left-radius:10px;border-bottom-right-radius:10px;display:flex;justify-content:space-between;align-items:center;flex-shrink:0;position:relative;z-index:5}.pdf-controls button{background-color:var(--secondary-color);color:#fff;border:none;width:44px;height:44px;border-radius:50%;cursor:pointer;font-size:24px;font-weight:700;line-height:44px;transition:background-color .2s,transform .2s}.pdf-controls button:hover{background-color:#2980b9;transform:scale(1.1)}.pdf-controls button:disabled{background-color:#ccc;cursor:not-allowed;transform:scale(1)}.pdf-controls span{font-weight:700;font-size:16px}

/* -- Responsive Mobile Menu -- */
@media (max-width: 992px) {
    .hamburger {
        display: block;
    }
    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }
    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .menu-wrapper {
        position: absolute;
        left: -100%;
        top: var(--nav-height);
        background-color: white;
        width: 100%;
        box-shadow: 0 10px 10px rgba(0,0,0,0.1);
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        transition: left 0.3s ease;
    }

    .menu-wrapper.active {
        left: 0;
    }

    .nav-menu {
        flex-direction: column;
        gap: 0;
        width: 100%;
    }
    .nav-menu li {
        text-align: center;
        border-top: 1px solid #f1f1f1;
    }
    .nav-link {
        padding: 15px;
        justify-content: center;
    }
    .dropdown-nav:hover .dropdown-content {
        display: none; /* Nonaktifkan hover di mobile */
    }
    .dropdown-nav.open .dropdown-content {
        display: block;
        position: static;
        box-shadow: none;
        width: 100%;
        opacity: 1;
        visibility: visible;
    }
    .dropdown-content a {
        background-color: #f8f8f8;
    }

    .search-container-nav {
        padding: 20px;
    }
    #searchInput {
        width: 100%;
    }
    
    .modal.visible{padding:0}.modal-content{width:100%;height:100%;max-width:100%;max-height:100%;border-radius:0}.close-button{top:5px;right:5px;width:30px;height:30px;line-height:30px;font-size:20px;color:#333;background-color:#fff}.pdf-controls button{width:40px;height:40px;font-size:20px;line-height:40px}.pdf-controls span{font-size:14px}

    .book-gallery {
        gap: 15px;
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    }
    .book-cover {
        height: 200px;
    }
    .book-title {
        font-size: 14px;
        padding: 10px;
    }
}

/* -- Skeleton Loading & Card Animation -- */
.skeleton-card {
    background-color: #e0e0e0;
    border-radius: 10px;
    display: flex;
    flex-direction: column;
    /* Sesuaikan tinggi agar konsisten dengan kartu buku asli */
    height: 385px; 
    position: relative;
    overflow: hidden;
}

@media (max-width: 992px) {
    .skeleton-card {
        height: 270px; /* Tinggi skeleton di mobile */
    }
}


/* Efek kilatan/shimmer pada skeleton */
.skeleton-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: shimmer 1.5s infinite linear;
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(100%);
    }
}

/* Animasi untuk kartu buku saat muncul */
.book-card {
    background-color:var(--card-bg-color);
    border-radius:10px;
    box-shadow:var(--shadow);
    overflow:hidden;
    cursor:pointer;
    transition:transform .3s ease,box-shadow .3s ease;
    display:flex;
    flex-direction:column;
    /* Mulai dengan transparan dan sedikit ke atas */
    opacity: 0;
    transform: translateY(20px);
    /* Terapkan animasi */
    animation: card-fade-in 0.5s ease-out forwards;
}
.book-card:hover{transform:translateY(-8px);box-shadow:0 10px 25px rgba(0,0,0,.15)}.book-cover{width:100%;height:280px;background-color:#e0e0e0;display:flex;align-items:center;justify-content:center;color:#aaa}.book-cover img{width:100%;height:100%;object-fit:cover}.book-title{padding:15px;font-weight:600;text-align:center;flex-grow:1;display:flex;align-items:center;justify-content:center;font-size:15px}


@keyframes card-fade-in {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}