* {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: Arial, sans-serif;
      background-color: #0e0e0e;
      color: #ffffff;
      line-height: 1.6;
    }

    header {
      background: linear-gradient(to right, #00ff99, #00cc66);
      padding: 20px;
      text-align: center;
      position: relative;
    }

    header h1 {
      color: #000;
    }

    /* Tombol menu (kiri atas) */
    .menu-btn {
      position: absolute;
      top: 20px;
      left: 20px;
      background: #000;
      border: none;
      color: #00ff99;
      font-size: 24px;
      cursor: pointer;
      padding: 5px 10px;
      border-radius: 4px;
    }

    /* Sidebar kiri */
    .sidebar {
      position: fixed;
      top: 0;
      left: -250px;
      width: 250px;
      height: 100%;
      background-color: #1a1a1a;
      padding: 20px;
      transition: left 0.3s ease;
      z-index: 999;
    }

    .sidebar.open {
      left: 0;
    }

    .sidebar h3 {
      margin-bottom: 15px;
      color: #00ff99;
    }

    .sidebar a {
      display: block;
      color: #fff;
      text-decoration: none;
      margin: 10px 0;
    }

    section {
      padding: 20px;
    }

    .section-title {
      color: #00ff99;
      border-left: 4px solid #00ff99;
      padding-left: 10px;
      margin-bottom: 10px;
      font-size: 1.5em;
    }

    .card {
      background-color: #1c1c1c;
      border-left: 4px solid #00ff99;
      padding: 15px;
      margin: 10px 0;
      border-radius: 8px;
    }

    footer {
      background-color: #111;
      text-align: center;
      padding: 15px;
      font-size: 0.9em;
      color: #ccc;
    }

    @media (max-width: 768px) {
      header h1 {
        font-size: 1.5em;
      }

      .section-title {
        font-size: 1.2em;
      }

      .card {
        font-size: 0.95em;
      }
    }