/* --- PENGATURAN GLOBAL & VARIABEL WARNA --- */
/* Tema 1: Light (Default) */
:root {
    --primary-color: #3498db;
    --background-color: #f4f6f9;
    --surface-color: #ffffff;
    --text-color: #2c3e50;
    --border-color: #dddddd;
    --footer-bg-color: #283747; /* Warna footer bisa kita pisah */
}

/* Tema 2: Dark */
body[data-theme="dark"] {
    --primary-color: #5dade2;
    --background-color: #000000;
    --surface-color: #000000;
    --text-color: #ecf0f1;
    --border-color: #444;
    --footer-bg-color: #17202a;
}

/* Tema 3: Sepia */
body[data-theme="sepia"] {
    --primary-color: #b87d48;
    --background-color: #eee5d3;
    --surface-color: #fffdfa;
    --text-color: #5d4037;
    --border-color: #d4aa7d;
    --footer-bg-color: #644536;
}

/* Tema 4: Slate */
body[data-theme="slate"] {
    --primary-color: #00cec9;
    --background-color: #2d3436;
    --surface-color: #353b48;
    --text-color: #dfe6e9;
    --border-color: #636e72;
    --footer-bg-color: #2c3e50;
}

/* Tema 5: Winter */
body[data-theme="winter"] {
    --primary-color: #4F7C82;
    --background-color: #cdf9fd;
    --surface-color: #ffffff;
    --text-color: #0B2E33;
    --border-color: #93B1B5;
    --footer-bg-color: #1d4b52;
}

/* Tema 6: Matcha */
body[data-theme="matcha"] {
    --primary-color: #6a994e;
    --background-color: #f0f4f0;
    --surface-color: #fafbf9;
    --text-color: #3a5335;
    --border-color: #a9b8a5;
    --footer-bg-color: #3a5335;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

/* --- HEADER & NAVIGASI --- */
header {
    background-color: var(--surface-color);
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

.logo i {
    margin-right: 8px;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
}

nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s ease;
}

nav a:hover {
    color: var(--primary-color);
}

#theme-toggle-btn {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 8px 10px;
    border-radius: 5px;
}

/* --- KONTEN UTAMA & SECTION --- */
main {
    padding: 2rem 5%;
}

section {
    margin-bottom: 4rem;
}

h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 0.5rem;
    display: inline-block;
}

/* --- SECTION: BERANDA --- */
.banner {
    background-image: url('assets/images/Library.jpg'); /* Ganti dengan nama file banner Anda */
    background-size: cover;
    background-position: center;
    height: 400px;
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    flex-direction: column;
    border-radius: 10px;
    margin-bottom: 3rem;
}

.banner h1 {
    font-size: 3rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
}

.banner p {
    font-size: 1.2rem;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.7);
}

/* --- SECTION: KOLEKSI BUKU --- */
.filter-controls {
    margin-bottom: 2rem;
    display: flex;
    gap: 1rem;
}

#search-input, #genre-filter {
    padding: 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    background-color: var(--surface-color);
    color: var(--text-color);
    font-size: 1rem;
}

#search-input {
    width: 300px;
}

.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 2rem;
}

.book-card {
    background-color: var(--surface-color);
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    text-align: center;
    position: relative;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.book-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

.book-card img {
    width: 100%;
    height: 280px;
    object-fit: cover;
}

.book-card h3 {
    font-size: 1.1rem;
    margin: 1rem 0.5rem 0.5rem;
}

.book-card p {
    font-size: 0.9rem;
    color: #888;
    margin-bottom: 1rem;
}

.book-card .read-button {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    color: white;
    border: none;
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0; /* Sembunyikan tombol */
    transition: opacity 0.3s ease;
}

.book-card:hover .read-button {
    opacity: 1; /* Tampilkan tombol saat hover */
}

/* --- FOOTER --- */
footer {
    background-color: var(--footer-bg-color); /* Warna gelap seperti di referensi */
    color: #aeb6bf;
    padding: 3rem 5% 0; /* Padding atas lebih besar */
    margin-top: 4rem;
}

.footer-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    padding-bottom: 2rem;
}

.footer-column h3 {
    color: #ffffff;
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    position: relative;
}

/* Membuat garis aksen di bawah judul (seperti garis merah di referensi) */
.footer-column h3::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -8px;
    width: 50px;
    height: 2px;
    background-color: var(--primary-color);
}

.footer-column p {
    line-height: 1.6;
}

.footer-column.about .social-media {
    margin-top: 1.5rem;
    display: flex;
    gap: 10px;
}

.footer-column.about .social-media a {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    color: #ffffff;
    border-radius: 50%;
    text-decoration: none;
    font-size: 1rem;
    transition: background-color 0.3s ease;
}

.footer-column.about .social-media a:hover {
    background-color: var(--primary-color);
}

.footer-column.links ul,
.footer-column.contact ul {
    list-style: none;
    padding: 0;
}

.footer-column.links ul li,
.footer-column.contact ul li {
    margin-bottom: 1rem;
}

.footer-column.links a {
    color: #aeb6bf;
    text-decoration: none;
    transition: color 0.3s ease, padding-left 0.3s ease;
}

.footer-column.links a:hover {
    color: #ffffff;
    padding-left: 5px;
}

.footer-column.contact i {
    color: var(--primary-color);
    margin-right: 10px;
    width: 20px; /* Agar ikon sejajar rapi */
    text-align: center;
}

.footer-bottom {
    border-top: 1px solid #444;
    padding: 1.5rem 0;
    text-align: center;
    font-size: 0.9rem;
}

/* Membuat footer responsif di layar kecil */
@media (max-width: 768px) {
    .footer-container {
        grid-template-columns: 1fr; /* Kolom akan menumpuk ke bawah */
        text-align: center;
    }

    .footer-column h3::after {
        left: 50%;
        transform: translateX(-50%);
    }

    .footer-column.about .social-media {
        justify-content: center;
    }
}

/* --- STYLING UNTUK BAGIAN READING STATUS --- */
.book-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.reading-card {
    display: flex;
    gap: 1rem;
    background-color: var(--surface-color);
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.reading-card img {
    width: 80px;
    height: 120px;
    object-fit: cover;
    border-radius: 4px;
}

.reading-info {
    width: 100%;
}

.reading-info h4 {
    margin-bottom: 0.5rem;
}

.reading-info progress {
    width: 100%;
    margin: 0.5rem 0;
}

.reading-actions button {
    padding: 5px 10px;
    margin-right: 5px;
    border: 1px solid var(--primary-color);
    background-color: transparent;
    color: var(--primary-color);
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
}

.reading-actions button:hover {
    background-color: var(--primary-color);
    color: white;
}

.reading-card.simple {
    align-items: center;
}

/* --- STYLING UNTUK BAGIAN TENTANG KAMI --- */
#tentang p {
    max-width: 800px; /* Agar teks tidak terlalu lebar */
    margin: 0 auto 3rem auto; /* Tengah dan beri jarak ke bawah */
    text-align: center;
    font-size: 1.1rem;
    line-height: 1.7;
}

.team-container {
    display: flex;
    justify-content: center;
    flex-wrap: wrap; /* Agar responsif di layar kecil */
    gap: 2rem; /* Jarak antar kartu */
}

.team-card {
    background-color: var(--surface-color);
    border-radius: 15px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    text-align: center;
    padding: 2rem;
    width: 280px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.team-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.12);
}

.team-card img {
    width: 120px;
    height: 120px;
    border-radius: 50%; /* Membuat foto menjadi bulat */
    object-fit: cover;
    margin-bottom: 1rem;
    border: 4px solid var(--primary-color);
}

.team-card h4 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.team-card p {
    font-size: 1rem;
    color: #888;
    margin-bottom: 0;
}

/* --- STYLING UNTUK SLIDER TEMA --- */
.theme-slider-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-label {
    font-weight: 500;
    width: 50px; /* Beri lebar agar layout tidak bergeser saat teks berubah */
    text-align: right;
}

/* Menghilangkan tampilan default slider */
input[type=range] {
    -webkit-appearance: none;
    appearance: none;
    width: 100px;
    height: 10px;
    background: var(--border-color);
    border-radius: 5px;
    cursor: pointer;
}

/* Styling Thumb (Gagang Slider) untuk Chrome/Safari */
input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    border: 2px solid var(--surface-color);
    box-shadow: 0 0 4px rgba(0,0,0,0.2);
    transition: transform 0.2s ease;
}

input[type=range]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

/* Styling Thumb (Gagang Slider) untuk Firefox */
input[type=range]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    border: 2px solid var(--surface-color);
    box-shadow: 0 0 4px rgba(0,0,0,0.2);
    transition: transform 0.2s ease;
}

input[type=range]::-moz-range-thumb:hover {
    transform: scale(1.1);
}


/* --- ATURAN RESPONSIVE (MEDIA QUERIES) --- */


/* --- Tampilan Tablet (Layar <= 768px) --- */
@media (max-width: 768px) {
    /* Header & Navigasi */
    header {
        flex-direction: column; /* Membuat logo, nav, dan slider menumpuk */
        gap: 1rem;
        padding: 1rem 2%;
    }

    /* Konten Utama */
    main {
        padding: 2rem 3%;
    }

    .banner h1 {
        font-size: 2.5rem; /* Perkecil ukuran judul banner */
    }

    /* Filter Kontrol */
    .filter-controls {
        flex-direction: column; /* Membuat search bar dan filter menumpuk */
        align-items: stretch;
    }

    #search-input {
        width: 100%;
    }
    
    /* Grid Buku dikecilkan sedikit */
    .book-grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
        gap: 1.5rem;
    }
    
    /* Kartu di Beranda */
    .book-list {
        grid-template-columns: 1fr; /* Pastikan hanya 1 kolom */
    }
}

/* --- Tampilan Mobile (Layar <= 480px) --- */
@media (max-width: 480px) {
    /* Pengaturan Font Dasar */
    body {
        font-size: 14px;
    }
    
    /* Header lebih simpel */
    header {
        padding: 1rem;
    }

    nav ul {
        gap: 1.5rem; /* Kurangi jarak antar menu */
    }
    
    /* Banner lebih kecil */
    .banner {
        height: 300px;
    }

    .banner h1 {
        font-size: 2rem;
    }

    .banner p {
        font-size: 1rem;
    }

    /* Judul Section */
    h2 {
        font-size: 1.5rem;
    }
    
    /* Grid Buku menjadi 1 kolom */
    .book-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .book-card img {
        height: 250px; /* Kurangi tinggi gambar agar tidak terlalu dominan */
    }

    /* Kartu "Sedang Dibaca" */
    .reading-card {
        flex-direction: column; /* Gambar di atas, info di bawah */
        align-items: center;
        text-align: center;
    }
    
    /* Kartu Anggota Tim */
    .team-card {
        width: 100%; /* Lebar kartu tim menjadi penuh */
        padding: 1.5rem;
    }

    /* Footer */
    .footer-container {
        text-align: left;
    }

    .footer-column h3::after {
        left: 0;
        transform: none;
    }

    .footer-column.about .social-media {
        justify-content: left;
    }
}