/* ==========================================================
   HALAMAN DETAIL MATERI (KOSMETIK, OBAT, DLL)
========================================================== */
.kategori-header {
    padding-top: 140px; /* Offset untuk navbar */
    padding-bottom: 20px;
    background-color: #FFFFFF;
}

.page-title {
    color: #05417C;
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.page-desc {
    font-size: 1.1rem;
    color: #4B5563;
    max-width: 1300px;
    line-height: 1.6;
}

.page-desc strong {
    color: #05417C;
}

/* Tata Letak Grid (Sidebar Kiri & Viewer Kanan) */
.materi-grid {
    display: grid;
    grid-template-columns: 300px 1fr; /* Kiri 300px, Kanan menyesuaikan sisa ruang */
    gap: 30px;
    margin-bottom: 80px;
    align-items: start;
}

/* Sidebar Menu */
.materi-sidebar {
    background-color: #1E3A5F; /* Biru gelap khas instansi sesuai screenshot */
    border-radius: 8px;
    padding: 25px 20px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.sidebar-title {
    color: #FFFFFF;
    font-size: 1.3rem;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid rgba(255,255,255,0.2);
}

.sidebar-menu {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.materi-btn {
    background-color: transparent;
    color: #FFFFFF;
    border: 1px solid rgba(255,255,255,0.15);
    padding: 15px;
    text-align: left;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: 6px;
    cursor: pointer;
    line-height: 1.4;
    transition: all 0.3s ease;
    font-family: 'Poppins', sans-serif;
}

.materi-btn:hover {
    background-color: rgba(255,255,255,0.1);
}

/* Status Tombol Saat Sedang Dilihat (Aktif) */
.materi-btn.active {
    background-color: #FFFFFF;
    color: #1E3A5F;
    font-weight: 700;
    border-color: #FFFFFF;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

/* Area Penampil Media */
.materi-viewer {
    background-color: #FFFFFF;
    border: 1px solid #E5E7EB;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.04);
}

.viewer-title {
    color: #05417C;
    font-size: 1.4rem;
    margin-bottom: 20px;
    font-weight: 700;
}

/* Wadah iFrame untuk Video / PDF */
.iframe-container {
    position: relative;
    width: 100%;
    /* Mengunci rasio layar ke 16:9 (Standar YouTube/Presentasi) */
    padding-bottom: 56.25%; 
    height: 0;
    border-radius: 8px;
    overflow: hidden;
    background-color: #333333; /* Warna dasar gelap saat memuat */
}

.iframe-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

/* Responsivitas Layar */
@media (max-width: 992px) {
    .materi-grid {
        grid-template-columns: 1fr; /* Berubah jadi atas-bawah di layar kecil */
    }
    .materi-sidebar {
        order: 2; /* Memindahkan menu ke bawah video saat di HP */
    }
    .materi-viewer {
        order: 1; /* Memastikan video tampil lebih dulu di atas */
        padding: 15px;
    }
}