/* Container Dasar */
    .download-section {
        padding: 80px 5%;
        background-color: #f8fafc;
        min-height: 100vh;
    }

    .container {
        max-width: 1300px;
        margin: 0 auto;
    }

    .section-header {
        text-align: left;
        margin-bottom: 60px;
        max-width: 800px; 
        animation: smoothReveal 1s var(--smooth-bezier) forwards;
    }

    .section-header h1 {
        color: var(--primary); 
        font-size: 42px;
        margin-bottom: 18px;
        letter-spacing: -0.5px;
    }

    .section-header p {
        color: #64748b;
        font-size: 16px;
        line-height: 1.8;
    }

    /* Grid Layout */
    .download-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
        gap: 30px;
    }

    /* Styling Card */
    .ebook-card {
        background: var(--white);
        border-radius: 20px;
        overflow: hidden;
        box-shadow: 0 10px 30px rgba(0,0,0,0.05);
        transition: all 0.4s var(--smooth-bezier);
        border: 1px solid rgba(0,0,0,0.03);
    }

    .ebook-card:hover {
        transform: translateY(-10px);
        box-shadow: 0 20px 40px rgba(5, 154, 135, 0.12);
    }

    .ebook-preview {
        position: relative;
        height: 220px;
        overflow: hidden;
    }

    .ebook-preview img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform 0.6s var(--smooth-bezier);
    }

    .ebook-card:hover .ebook-preview img {
        transform: scale(1.1);
    }

    .badge {
        position: absolute;
        top: 15px;
        right: 15px;
        background: var(--secondary);
        color: var(--white);
        padding: 5px 15px;
        border-radius: 20px;
        font-size: 12px;
        font-weight: 600;
    }

    .ebook-info {
        padding: 25px;
    }

    .logo-img {
        max-height: 50px; 
        width: auto;
        display: block;
    }

    .ebook-info h3 {
        color: var(--text-dark);
        margin-bottom: 12px;
        font-size: 20px;
    }

    .ebook-info p {
        color: #64748b;
        font-size: 14px;
        line-height: 1.6;
        margin-bottom: 25px;
    }

    /* Tombol dalam Card */
    .ebook-actions {
        display: flex;
        gap: 12px;
    }

    .btn-preview, .btn-download-action {
        flex: 1;
        padding: 12px;
        border-radius: 10px;
        font-weight: 600;
        text-align: center;
        text-decoration: none;
        font-size: 14px;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        cursor: pointer;
        transition: all 0.3s ease;
    }

    .btn-preview {
        background-color: transparent; 
        color: var(--primary); 
        border: 2px solid var(--primary); 
    }

    .btn-preview:hover {
        background-color: var(--primary); 
        color: var(--white); 
    }

    .btn-download-action {
        background: var(--primary);
        color: var(--white);
        border: none;
    }

    .btn-download-action:hover {
        background: #047d6e;
        box-shadow: 0 5px 15px rgba(5, 154, 135, 0.3);
    }

    /* Modal Overlay */
    .modal {
        display: none;
        position: fixed;
        z-index: 2000;
        left: 0;
        top: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0,0,0,0.8);
        backdrop-filter: blur(5px);
    }

    .modal-content {
        position: relative;
        background-color: #fefefe;
        margin: 2% auto;
        width: 80%;
        height: 90vh;
        border-radius: 15px;
        overflow: hidden;
        animation: modalFade 0.4s var(--smooth-bezier);
    }

    @keyframes modalFade {
        from { opacity: 0; transform: scale(0.9); }
        to { opacity: 1; transform: scale(1); }
    }

    .modal-header {
        padding: 15px 25px;
        background: var(--white);
        display: flex;
        justify-content: space-between;
        align-items: center;
        border-bottom: 1px solid #eee;
    }

    .close {
        font-size: 28px;
        font-weight: bold;
        cursor: pointer;
    }

    .modal-body { height: 100%; }
    #pdfFrame { width: 100%; height: 100%; }

    /* Penyesuaian Responsif untuk Mobile */
    @media (max-width: 768px) {
        .modal-content { width: 95%; height: 80vh; }
        
        /* Penyesuaian teks header Ebook Center agar rapi di HP */
        .section-header {
            text-align: center;
            margin-bottom: 40px;
        }
        
        .section-header h1 {
            font-size: 32px;
        }
        
        .section-header p {
            text-align: justify;
        }
        
        .section-header p br {
            display: none; /* Menghilangkan <br> statis di HP agar flow teks natural */
        }
    }