:root {
      --primary-color: #00acc1;
      --secondary-color: #00838f;
      --background-color: #f0f4f8;
      --card-background: #ffffff;
      --text-color: #333;
      --input-bg: #f1f3f5;
      --nav-bg: #ffffff;
      --shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    }
    /* Mode Malam */
    .dark-mode {
      --background-color: #121212;
      --card-background: #1e1e1e;
      --text-color: #e0e0e0;
      --input-bg: #222;
      --nav-bg: #1f1f1f;
      --shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    }
    body {
      font-family: 'Poppins', sans-serif;
      padding-top: 80px;
      background-color: var(--background-color);
      color: var(--text-color);
      transition: background-color 0.3s, color 0.3s;
    }
    .navbar {
      background: var(--nav-bg);
      box-shadow: var(--shadow);
      transition: background 0.3s, box-shadow 0.3s;
    }
    /* Penyesuaian teks dan icon di navbar untuk mode malam */
    .navbar-brand,
    .nav-link {
     color: var(--text-color) !important;
     transition: color 0.3s; /* Animasi halus untuk perubahan warna */
     text-decoration: none; /* Pastikan tidak ada garis bawah default */
    }

    .nav-link:hover {
     color: var(--primary-color) !important; /* Ubah warna teks saat dihover */
     }

    /* Efek hover tambahan untuk mode malam */
    .dark-mode .nav-link:hover {
     color: var(--secondary-color) !important; /* Warna teks hover disesuaikan dengan mode malam */
    }
    
	/* Agar hamburger icon terlihat baik di mode malam */
    .navbar-toggler-icon {
      filter: none;
      transition: filter 0.3s;
    }
    .dark-mode .navbar-toggler-icon {
      filter: invert(1);
    }
    .card {
      background: var(--card-background);
      color: var(--text-color);
      border: none;
      border-radius: 15px;
      box-shadow: var(--shadow);
      margin-bottom: 25px;
      transition: background 0.3s, color 0.3s, box-shadow 0.3s;
    }
    .input-group {
      margin-bottom: 15px;
    }
    .input-group-text {
      background: #e9ecef;
      border: none;
      cursor: help;
      border-radius: 10px 0 0 10px;
      transition: background 0.3s, color 0.3s;
    }
    .form-control {
      border-radius: 0 10px 10px 0;
      background: var(--input-bg);
      color: var(--text-color);
      border: 1px solid #ccc;
      transition: background 0.3s, color 0.3s;
    }
    .btn {
      border-radius: 10px;
      padding: 12px 30px;
      transition: transform 0.2s;
    }
    .btn:hover {
      transform: scale(1.01);
    }
    .result-box {
      background: var(--card-background);
      border-radius: 10px;
      padding: 20px;
      min-height: 100px;
      transition: background 0.3s, color 0.3s;
    }
    .info-tooltip {
      font-size: 0.8em;
      color: var(--text-color);
      margin-top: 5px;
      opacity: 0.8;
      transition: color 0.3s;
    }
    .tooltip-inner {
      background-color: var(--primary-color);
      color: #fff;
      border-radius: 8px;
      padding: 8px 12px;
    }
    footer {
      background-color: var(--nav-bg);
      padding: 20px 0;
      margin-top: 40px;
      border-top: 1px solid #ccc;
      transition: background 0.3s, color 0.3s;
    }
    /* Tombol Mode Malam */
    #darkModeToggle {
      border-color: var(--primary-color);
      color: var(--primary-color);
      transition: background 0.3s, color 0.3s;
    }
    #darkModeToggle:hover {
      background-color: var(--primary-color);
      color: #fff;
    }
    /* Responsive adjustments */
    @media (max-width: 576px) {
      .container {
        padding-left: 15px;
        padding-right: 15px;
      }
      h1 {
        font-size: 1.5rem;
      }
    }