/* --- VARIABLES & THEME SETUP --- */
:root {
    --bg-main: #050505;
    --bg-secondary: #0a0a0a;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --accent-purple: #8b5cf6;
    --accent-green: #10b981;
    --border-color: rgba(255, 255, 255, 0.08);
    --card-bg: rgba(20, 20, 20, 0.6); /* Lebih gelap & transparan */
    --card-hover: rgba(255, 255, 255, 0.05);
    --navbar-bg: rgba(5, 5, 5, 0.8);
    --max-width: 680px; /* KUNCI AGAR TIDAK MELEBAR KEMANA-MANA */
}

/* --- RESET & BASE STYLES --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* --- BACKGROUND ANIMATION --- */
.bg-noise {
    position: fixed; inset: 0; z-index: -3; opacity: 0.05;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='1'/%3E%3C/svg%3E");
    pointer-events: none;
}
.bg-gradient-1 {
    position: fixed; top: -20%; left: 50%; transform: translateX(-50%);
    width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.15) 0%, transparent 70%);
    z-index: -2; pointer-events: none;
}

/* --- LAYOUT UTILITIES --- */
.container {
    width: 90%;
    max-width: var(--max-width); /* Fokus di tengah */
    margin-inline: auto;
}

.main-wrapper {
    flex: 1;
    padding-block: 3rem;
    display: flex;
    flex-direction: column;
    align-items: center; /* Pastikan semua item di tengah */
}

/* --- NAVBAR --- */
.navbar {
    position: sticky; top: 0; z-index: 100;
    padding-block: 1rem;
    background: var(--navbar-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}
.nav-container { display: flex; justify-content: space-between; align-items: center; }
.brand-text { font-weight: 700; letter-spacing: 1px; font-size: 1.1rem; }
.nav-back { text-decoration: none; color: var(--text-secondary); font-size: 0.9rem; display: flex; align-items: center; gap: 5px; }
.nav-back:hover { color: var(--text-primary); }

/* --- PROFILE SECTION (CENTERED) --- */
.profile-section {
    text-align: center;
    margin-bottom: 3rem;
    width: 100%;
}
.image-container {
    width: 120px; height: 120px; margin: 0 auto 1.5rem;
    border-radius: 50%; padding: 4px;
    border: 1px solid var(--border-color);
}
.profile-img { width: 100%; height: 100%; object-fit: cover; border-radius: 50%; }
.username { font-size: 1.8rem; font-weight: 700; margin-bottom: 0.5rem; }
.bio { color: var(--text-secondary); font-size: 0.95rem; max-width: 400px; margin: 0 auto 1rem; }

/* --- LINKS GRID --- */
.links-section { width: 100%; }
.links-grid { display: flex; flex-direction: column; gap: 1rem; }

/* --- LINK CARD --- */
.link-card {
    display: flex; align-items: center; gap: 1rem;
    padding: 1rem 1.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    text-decoration: none; color: var(--text-primary);
    transition: 0.2s ease;
}
.link-card:hover {
    background: var(--card-hover);
    transform: translateY(-2px);
    border-color: var(--text-secondary);
}
.card-icon { font-size: 1.5rem; display: flex; align-items: center; color: var(--text-secondary); }
.card-content { flex: 1; text-align: left; } /* Teks rata kiri agar rapi dibaca */
.card-content h3 { font-size: 1rem; font-weight: 600; }
.card-content p { font-size: 0.8rem; color: var(--text-secondary); margin-top: 2px; }

/* --- CONTENT PAGE STYLES (Untuk Ebook.php dll) --- */
.content-box {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    width: 100%;
    text-align: left;
}
.content-box h1 { margin-bottom: 1rem; font-size: 1.8rem; }
.content-box p { color: var(--text-secondary); margin-bottom: 1.5rem; }
.btn-primary {
    display: inline-block;
    background: var(--text-primary); color: var(--bg-main);
    padding: 12px 24px; border-radius: 50px;
    text-decoration: none; font-weight: 600;
    transition: 0.3s;
}
.btn-primary:hover { opacity: 0.9; transform: scale(1.02); }

/* --- FOOTER --- */
.footer {
    padding: 2rem; border-top: 1px solid var(--border-color);
    text-align: center; color: var(--text-secondary); font-size: 0.85rem;
}

/* Animasi Masuk */
.animate-up { animation: fadeUp 0.6s ease forwards; opacity: 0; transform: translateY(20px); }
@keyframes fadeUp { to { opacity: 1; transform: translateY(0); } }

/* --- EBOOK GALLERY STYLES --- */

/* Grid Container */
.ebook-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); /* Responsif */
    gap: 1.5rem;
    margin-top: 2rem;
}

/* Kartu Buku */
.ebook-card {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 10px;
    border: 1px solid var(--border-color);
    transition: 0.3s;
    text-align: center;
}

.ebook-card:hover {
    background: var(--card-hover);
    transform: translateY(-5px);
    border-color: var(--accent-purple);
}

/* Area Cover (Canvas) */
.ebook-cover {
    width: 100%;
    aspect-ratio: 1 / 1.4; /* Rasio Kertas A4 */
    background: #222;
    border-radius: 8px;
    overflow: hidden;
    position: relative;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 10px;
}

.pdf-canvas {
    width: 100%;
    height: 100%;
    object-fit: contain; /* Agar cover pas */
    display: none; /* Disembunyikan sampai selesai loading */
}

.loading-indicator {
    color: var(--text-secondary);
    font-size: 1.5rem;
}
.animate-spin {
    animation: spin 1s linear infinite;
}
@keyframes spin { 100% { transform: rotate(360deg); } }

/* Info Buku */

.ebook-info {
    width: 100%;
    margin-top: auto; /* Agar tombol selalu di bawah card */
}

.ebook-info h3 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 10px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    text-align: center; /* Judul rata tengah */
}

.btn-read {
    /* Reset style bawaan Android/iOS yang bikin aneh */
    -webkit-appearance: none; 
    appearance: none;
    
    /* Layout Flexbox agar Ikon & Teks Rapi */
    display: flex;
    align-items: center;
    justify-content: center; /* KUNCI AGAR TEKS DI TENGAH */
    gap: 8px;
    
    /* Ukuran */
    width: 100%;
    padding: 10px 0; /* Padding lebih besar agar enak ditekan di HP */
    
    /* Warna & Font */
    background: var(--card-bg); /* Pakai bg card agar blend atau pakai var(--border-color) */
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 8px;
    
    font-family: inherit; /* Pastikan font sama dengan body */
    font-size: 0.85rem;
    font-weight: 500;
    line-height: 1; /* Mencegah teks loncat ke atas/bawah */
    
    cursor: pointer;
    transition: all 0.2s ease;
}

/* Efek Hover */
.btn-read:hover, .btn-read:active {
    background: var(--accent-purple);
    border-color: var(--accent-purple);
    color: white;
    transform: translateY(-2px);
}