/* ========== RESET & GLOBAL ========== */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: Arial, sans-serif;
      font-size: 18px;
      line-height: 1.6;
      background: #fdfdfd;
      color: #111;
      padding: 1rem;
      margin: 0 auto;
      max-width: 480px;
    }

    /* ========== TYPOGRAPHY ========== */
    h1, h2 {
      text-align: center;
      margin-top: 1.5rem;
      color: #004085;
    }
	
	h3, h4, h5, h6 {
      text-align: left;
      margin-top: 1.5rem;
      color: #004085;
    }

    h1 { font-size: 22px; }
    h2 { font-size: 20px; }
    h3 { font-size: 19px; }
    h4 { font-size: 18px; }
    h5 { font-size: 17px; margin: 0.5rem 0; }
	h5 { font-size: 14px; margin: 0.5rem 0; }

    p { margin: 0.5rem 0; }
    label {
      display: block;
      margin-top: 1rem;
      font-weight: bold;
    }

    /* ========== HEADER & NAVIGATION ========== */
    header {
      background: #66004b;
      color: white;
      padding: 10px 20px;
    }

    nav {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
    }

    nav .logo {
      font-size: 1.2rem;
      font-weight: bold;
    }

    nav .menu-toggle {
      display: none;
      font-size: 1.5rem;
      cursor: pointer;
    }

    nav ul {
      list-style: none;
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    nav ul li a {
      color: white;
      text-decoration: none;
      padding: 4px 10px;
      display: block;
    }

    nav ul li a:hover {
      background: #006699;
      border-radius: 4px;
    }

    /* Responsive Navigation */
    @media (max-width: 9768px) {
      nav .menu-toggle { display: block; }
      nav ul {
        display: none;
        flex-direction: column;
        width: 100%;
        background: #004466;
      }
      nav ul.show { display: flex; }
      nav ul li { width: 100%; text-align: left; }
    }

    #nav-links { display: none; }
    #nav-links.show { display: block; }

    /* ========== FORM & INPUTS ========== */
    .input-group { margin: 8px 0; }

    input[type="number"],
    input[type="range"] {
      width: 100%;
      padding: 12px;
      font-size: 20px;
      margin: 4px 0;
      box-sizing: border-box;
      border: 2px solid #ccc;
      border-radius: 6px;
      background-color: #fff;
    }

    input[type="number"]:focus {
      border-color: #007bff;
      outline: none;
      background-color: #f0f8ff;
    }

    /* Custom Range Slider Styling */
    input[type="range"] {
      height: 8px;
      border-radius: 5px;
      appearance: none;
      background: #ddd;
      outline: none;
    }

    input[type="range"]::-webkit-slider-thumb {
      appearance: none;
      width: 18px;
      height: 18px;
      border-radius: 50%;
      background: #333;
      cursor: pointer;
    }

    /* Checkbox styling */
    input[type="checkbox"] {
      width: auto;
      margin-right: 8px;
      vertical-align: middle;
    }

    /* ========== BUTTONS ========== */
    button {
      font-size: 20px;
      padding: 14px 24px;
      margin: 10px 0;
      border: none;
      border-radius: 8px;
      cursor: pointer;
      width: 100%;
      background: #4CAF50;
      color: white;
      transition: background 0.2s ease;
    }

    button:hover { background-color: #0056b3; }
    button:active { background: #388E3C; }
    button:disabled {
      background: #aaa;
      cursor: not-allowed;
    }

    button.secondary {
      background-color: #e0e0e0;
      color: #333;
    }

    button.secondary:active { background-color: #aaa; }

    /* ========== SECTIONS & RESULT ========== */
    .section {
      background: #fff;
      padding: 1rem;
      border-radius: 10px;
      margin-bottom: 2rem;
      box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    }

    .result {
      margin-top: 2rem;
      padding: 1rem;
      font-size: 20px;
      font-weight: bold;
      border-radius: 10px;
      background-color: #e9f7ff;
      border: 2px solid #efefef;
      min-height: 100px;
    }

    /* ========== ANIMATIONS & UTILITIES ========== */
    .flash { animation: flashHighlight 1s ease-in-out; }

    @keyframes flashHighlight {
      0% { background-color: #fff3cd; }
      50% { background-color: #ffeeba; }
      100% { background-color: transparent; }
    }

    .highlight { animation: flash 1s ease; }

    @keyframes flash {
      0% { background-color: #ffffcc; }
      100% { background-color: transparent; }
    }

    /* Focus utility for output */
    #output:focus {
      outline: 2px solid #007bff;
    }

    /* Helper text styling */
    .helper-text {
      font-size: 14px;
      color: #555;
      margin-top: 6px;
    }

    /* ========== CSS OVERRIDE (placed last per cascade rule) ========== */
    /* Jika ada style yang perlu menimpa sebelumnya, taruh di sini */