body::before {
    content: "rangkuman.css loaded!";
    background: yellow;
    display: block;
    padding: 5px;
    text-align: center;
  }
  
html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: Arial, sans-serif;
    background: #f0f2f5;
    color: #222;
    overflow-x: hidden;
}

    .materi-latihan-row {
      display: flex;
      gap: 1rem;
      flex-wrap: nowrap;
      align-items: flex-start;
      
    }
    .materi-container {
      flex: 0 0 80%;
      max-width: 80%;
      min-height : 400px;
      max-height: 3000px;
    }
    .materi-container .card-body {
      min-height: 400px;
      max-height: 3000px;
      overflow-y: auto;
      padding: 0.5rem;
      font-size: 13px;
    }
    .latihan-container {
      flex: 0 0 20%;
      max-width: 20%;
      max-height: 1200px;
      min-height: 400px;
      overflow-x: auto;
      font-size: 15px;
    }
    .latihan-container .card-body {
      min-height: 400px;
      max-height: 1200px;
      overflow-y: auto;
      padding: 0.5rem;
      font-size: 13px;
    }
    



/* Kartu materi utama */
.materi-item {
    background-color: #eaf2f8;
    padding: 15px 20px;
    margin-bottom: 12px;
    border-radius: 8px;
    user-select: none;
    transition: background-color 0.3s;
    font-size: 14px;
    line-height: 1.6;
    color: #222;
}

/* Hover dan aktif */
.materi-item:hover {
    background-color: #d0e4f7;
}
.materi-item.active {
    background-color: #c0d8f2;
    font-weight: 600;
}
.materi-item.active .sub-materi {
    display: block;
}

/* Judul materi */
.materi-item h5 {
    position: relative;
    cursor: pointer;
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 12px;
    color: #000;
    padding-right: 1.5rem;
}


/* Keterangan klik */
.materi-item h5::after {
    content: "Klik untuk melihat materi";
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.75rem;
    color: #000; /* warna hitam */
    font-weight: normal;
    line-height: 1;
}



/* Sub materi (isi) */
.sub-materi {
    display: none;
    margin-top: 10px;
    padding: 15px 20px;
    padding-left: 25px;
    background-color: #f5f9fc;
    border-radius: 4px;
    font-size: 15px;
    font-weight: 400;
    line-height: 1.5;
    text-align: justify;
    color: #222;
    font-family: Arial, sans-serif;
}

/* Sub materi list */
.sub-materi ul li {
    margin-bottom: 8px;
}

/* Box tantangan */
.sub-materi details {
  background-color: #e6f9e6; /* hijau muda */
  padding: 10px;
  border-left: 4px solid #4CAF50;
  border-radius: 4px;
  margin-top: 10px;
}