:root {
      --bg: #000000;
      --card: #000000;
      --primary: #9e3ded;
      --primary-dark: #cb6efa;
      --text: #2d2d2d;
      --muted: #7a7a7a;
      --border: #d3d8e0;
      --highlight: #9e3ded;
      --success: #27ae60;
      --danger: #c0392b;
    }

    * { box-sizing: border-box; }
    body {
      margin: 0;
      font-family: -apple-system, blinkmacsystemfont, segoe ui, roboto, oxygen-sans, ubuntu, cantarell, helvetica neue ,sans-serif !important;
      background: var(--bg);
      padding: 40px;
      color: var(--text);
    }

    .calc-container {
      max-width: 1400px;
      margin: auto;
      background: var(--card);
      padding: 30px;
      border-radius: 12px;
      box-shadow: 0 6px 20px rgba(0,0,0,0.08);
    }

    h2 {
      text-align: center;
      color: var(--primary);
    }

    table.inputs, table.result {
      width: 100%;
      border-collapse: collapse;
      margin-top: 20px;
      font-size: 0.95rem;
    }

    th, td {
      border: 1px solid var(--border);
      padding: 10px;
      text-align: center;
    }

    th {
      font-family: -apple-system, blinkmacsystemfont, segoe ui, roboto, oxygen-sans, ubuntu, cantarell, helvetica neue ,sans-serif !important;
      background: var(--highlight);
      font-weight: 700;
      color: #ffffff;
    }

    tbody tr:nth-child(odd) {
      background: #ffffff;
    }

    tbody tr:nth-child(even) {
      background: #ededed;
    }

    input, select {
      width: 100%;
      padding: 8px;
      border: 1px solid var(--border);
      border-radius: 4px;
      font-size: 0.9rem;
    }

    input:focus, select:focus {
      border-color: var(--primary);
      outline: none;
    }

    #calcBtn {
      margin: 20px auto 0;
      display: block;
      padding: 12px 24px;
      background: var(--primary);
      color: #fff;
      border: none;
      border-radius: 25px;
      font-size: 1rem;
      cursor: pointer;
      transition: background 0.2s ease;
    }

    #calcBtn:hover {
      background: var(--primary-dark);
    }

    .hint, .info {
      font-size: 0.9rem;
      color: var(--muted);
      margin-top: 15px;
      text-align: center;
    }

    .info {
      font-weight: 500;
    }

    .fee-input {
      max-width: 70px;
    }