:root {
    --bg-outside: #bde0fe;
    --paper-color: #ffffff;
    --primary-blue: #8ab6d6;
    --text-dark: #4a7c9d;
    --text-light: #7ca8c4;
    --hover-color: #a2d2ff;
}

body {
    background-color: var(--bg-outside);
    background-image: radial-gradient(#ffffff 1.5px, transparent 1.5px);
    background-size: 25px 25px;
    font-family: 'Nunito', sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px 10px;
    margin: 0;
}

/* Desain Tombol Unduh */
.action-bar {
    margin-bottom: 20px;
    z-index: 10;
}

#download-btn {
    background-color: var(--text-dark);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 30px;
    font-family: 'Nunito', sans-serif;
    font-weight: bold;
    font-size: 1rem;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0,0,0,0.15);
    transition: 0.3s;
}

#download-btn:hover {
    background-color: var(--primary-blue);
    transform: translateY(-3px);
}

/* Desain Buku Catatan */
.notebook-wrapper {
    background-color: var(--paper-color);
    width: 100%;
    max-width: 850px;
    border-radius: 10px;
    box-shadow: 10px 15px 30px rgba(0, 0, 0, 0.1);
    display: flex;
    position: relative;
    overflow: hidden;
}

.binder-holes {
    width: 40px;
    background-color: var(--paper-color);
    border-right: 2px solid #eef6fc;
    background-image: radial-gradient(circle at 20px 20px, var(--bg-outside) 8px, transparent 9px);
    background-size: 40px 45px;
    box-shadow: inset -5px 0 10px rgba(0,0,0,0.02);
}

.content {
    flex-grow: 1;
    padding: 40px 30px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
}

h1 {
    font-family: 'Fredoka', sans-serif;
    font-size: 3.5rem;
    color: var(--primary-blue);
    margin: 0;
    line-height: 1.1;
    letter-spacing: 2px;
    text-shadow: 3px 3px 0px #fff, -1px -1px 0 #fff, 1px -1px 0 #fff, -1px 1px 0 #fff, 1px 1px 0 #fff, 4px 4px 0px var(--primary-blue);
}

.star-icon { font-size: 2rem; }

.pricelist-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}

.card {
    border: 2.5px solid var(--primary-blue);
    border-radius: 16px;
    padding: 15px;
    text-align: center;
    background: #fff;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(138, 182, 214, 0.3);
    border-color: var(--hover-color);
}

.card h3 {
    font-family: 'Fredoka', sans-serif;
    color: var(--text-dark);
    font-size: 1.4rem;
    margin: 0 0 5px 0;
}

.category {
    font-size: 0.75rem;
    font-weight: 700;
    color: #fff;
    background-color: var(--text-light);
    padding: 3px 10px;
    border-radius: 20px;
    display: inline-block;
    margin-bottom: 15px;
}

.price-item {
    font-size: 0.9rem;
    color: var(--text-dark);
    margin: 6px 0;
    padding-bottom: 6px;
    border-bottom: 1px dashed var(--bg-outside);
    display: flex;
    justify-content: space-between;
}

.buy-btn { margin-top: auto; padding-top: 15px; }

.buy-btn a {
    display: block;
    background-color: var(--primary-blue);
    color: white;
    text-decoration: none;
    padding: 8px;
    border-radius: 8px;
    font-weight: bold;
    font-size: 0.9rem;
}

footer {
    margin-top: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.payment-badge, .social-badge {
    background-color: var(--bg-outside);
    color: var(--text-dark);
    padding: 10px 25px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: bold;
    text-align: center;
}


/* === DESAIN FAQ BUKA-TUTUP === */
.faq-container {
    width: 100%;
    max-width: 850px;
    margin-top: 30px;
    margin-bottom: 40px;
    background: var(--paper-color);
    border-radius: 10px;
    padding: 25px 30px;
    box-shadow: 10px 15px 30px rgba(0, 0, 0, 0.1);
    box-sizing: border-box;
}

.faq-container h2 {
    font-family: 'Fredoka', sans-serif;
    color: var(--primary-blue);
    text-align: center;
    margin-top: 0;
    margin-bottom: 20px;
    font-size: 2rem;
}

.faq-item {
    margin-bottom: 15px;
    border: 2px solid var(--primary-blue);
    border-radius: 8px;
    overflow: hidden;
}

.faq-item summary {
    font-family: 'Nunito', sans-serif;
    font-weight: bold;
    padding: 15px;
    background-color: var(--bg-outside);
    color: var(--text-dark);
    cursor: pointer;
    list-style: none; /* Menghilangkan panah bawaan */
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.3s;
}

/* Sembunyikan marker bawaan browser */
.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
    content: "➕";
    font-size: 0.9rem;
}

.faq-item[open] summary::after {
    content: "➖";
}

.faq-item[open] summary {
    background-color: var(--primary-blue);
    color: white;
}

.faq-item p {
    padding: 15px;
    margin: 0;
    color: var(--text-dark);
    font-size: 0.95rem;
    line-height: 1.5;
    background-color: #fff;
}
/* === EFEK LOADING (PRELOADER) === */
#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-outside);
    z-index: 9999; /* Pastikan selalu berada di paling atas */
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loader-circle {
    width: 50px;
    height: 50px;
    border: 5px solid #ffffff;
    border-top: 5px solid var(--primary-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 15px;
}

#preloader p {
    font-family: 'Fredoka', sans-serif;
    color: var(--text-dark);
    font-size: 1.2rem;
    letter-spacing: 1px;
    animation: pulse 1.5s infinite;
}

/* Animasi putaran lingkaran */
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Animasi teks kedap-kedip halus */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Class untuk menghilangkan preloader dengan halus */
.preloader-hidden {
    opacity: 0;
    visibility: hidden;
}
/* === EFEK SCROLL REVEAL === */
.reveal {
    opacity: 0;
    transform: translateY(40px); /* Elemen turun 40px dan tembus pandang */
    transition: all 0.6s cubic-bezier(0.5, 0, 0, 1); /* Efek pergerakan halus (smooth) */
}

.reveal.active {
    opacity: 1;
    transform: translateY(0); /* Elemen kembali ke posisi semula dan terlihat */
}
/* === TAMPILAN MOBILE (HP) === */
@media (max-width: 600px) {
    body {
        /* Menambah jarak kiri-kanan menjadi 15px agar kertas TIDAK MENTOK ke pinggir layar */
        padding: 20px 15px; 
    }

    .notebook-wrapper {
        border-radius: 8px;
        width: 100%; 
    }

    .pricelist-grid {
        grid-template-columns: repeat(2, 1fr); 
        gap: 10px;
    }
    
    h1 { font-size: 1.8rem; }
    .star-icon { font-size: 1.2rem; }
    
    /* Padding dalam kertas sedikit disesuaikan agar isi tetap seimbang */
    .content { padding: 20px 12px; } 
    
    .card { padding: 8px; border-width: 2px; }
    .card h3 { font-size: 1.1rem; margin-bottom: 5px; }
    .category { font-size: 0.6rem; padding: 2px 6px; margin-bottom: 8px; }
    
    .price-item {
        flex-direction: column;
        align-items: center;
        font-size: 0.75rem;
        gap: 2px;
        margin: 4px 0;
        padding-bottom: 4px;
    }
    
    .buy-btn { padding-top: 10px; }
    .buy-btn a { font-size: 0.65rem; padding: 6px; }
    
    /* POSISI LUBANG BINDER MOBILE (Tetap Aman & Simetris) */
    .binder-holes { 
        width: 25px; 
        background-image: radial-gradient(circle at 12.5px 22.5px, var(--bg-outside) 6px, transparent 7px);
        background-size: 25px 45px; 
    }
    
    footer { margin-top: 25px; gap: 8px; }
    .payment-badge, .social-badge { 
        font-size: 0.6rem; 
        padding: 8px 10px; 
        width: 95%; 
        box-sizing: border-box;
    }

    /* Penyesuaian FAQ di Mobile agar sejajar dengan poster */
    .faq-container {
        padding: 15px;
        margin-top: 20px;
        width: 100%;
        box-sizing: border-box;
    }
    .faq-container h2 {
        font-size: 1.5rem;
        margin-bottom: 15px;
    }
    .faq-item summary {
        padding: 12px;
        font-size: 0.85rem;
    }
    .faq-item p {
        padding: 12px;
        font-size: 0.8rem;
    }
}

/* === DESAIN JUDUL & LOGO APLIKASI === */
.card-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px; /* Jarak antara logo dan teks judul */
    margin-bottom: 5px;
}

.app-icon {
    width: 24px; /* Ukuran logo, bisa dibesarkan/dikecilkan sesuai selera */
    height: 24px;
    object-fit: contain; /* Memastikan logo tidak gepeng */
    border-radius: 50%; /* Opsional: Membuat pinggiran logo jadi bulat halus */
}

/* Menghilangkan jarak bawaan h3 agar lurus sejajar dengan logo */
.card-header h3 {
    margin: 0; 
}