:root {
      --font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
      --border-color: #dcdcdc;
      --border-focus: #4a90e2;
      --text-color: #333333;
      --label-color: #555555;
      --bg-gray: #e9e9e9;
    }

    .payment-container {
      background-color: #ffffff;
      width: 100%;
      max-width: 900px;
      border: 1px solid #d3d3d3;
      border-radius: 4px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    }

    .payment-header {
      padding: 15px 20px;
      border-bottom: 1px solid #e2e2e2;
      background-color: #fafafa;
    }

    .payment-header h2 {
      font-size: 24px;
      font-weight: 600;
      color: #1a2e40;
    }

    .payment-form {
      padding: 20px;
    }

    .form-row {
      display: flex;
      gap: 20px;
      margin-bottom: 15px;
      flex-wrap: wrap;
    }

    .form-group {
      flex: 1;
      min-width: 250px;
      display: flex;
      flex-direction: column;
    }

    .form-group.full-width {
      flex: 100%;
    }

    .form-group.half {
      flex: 1;
      min-width: 200px;
    }

    label {
      font-size: 13px;
      font-weight: 500;
      color: var(--label-color);
      margin-bottom: 6px;
    }

    input[type="text"],
    input[type="email"],
    input[type="tel"],
    select {
      width: 100%;
      padding: 10px 12px;
      border: 1px solid var(--border-color);
      border-radius: 4px;
      font-size: 14px;
      color: var(--text-color);
      outline: none;
      transition: border-color 0.15s ease-in-out;
      background-color: #ffffff;
    }

    input[type="text"]:focus,
    input[type="email"]:focus,
    input[type="tel"]:focus,
    select:focus {
      border-color: var(--border-focus);
    }

    /* Read only fields styling */
    .readonly-field {
      background-color: var(--bg-gray);
      border-color: #d1d1d1;
      cursor: not-allowed;
      font-weight: 500;
    }

    /* Payment modes styling */
    .payment-modes-container {
      display: flex;
      gap: 15px;
      margin-top: 5px;
      flex-wrap: wrap;
    }

    .payment-option-label {
      flex: 1;
      min-width: 240px;
      border: 1.5px solid #e0e0e0;
      border-radius: 6px;
      padding: 15px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      position: relative;
      transition: all 0.2s ease;
      background-color: #ffffff;
    }

    .payment-option-label:hover {
      border-color: #cccccc;
    }

    .payment-option-label.selected {
      border-color: #0076f6;
    }

    .option-details {
      display: flex;
      flex-direction: column;
      align-items: center;
      width: 100%;
      text-align: center;
    }

    .brand-logo-img {
      height: 38px;
      max-width: 100%;
      object-fit: contain;
      margin-bottom: 8px;
    }

    .brand-logo-svg {
      height: 32px;
      margin-bottom: 8px;
    }

    .option-text {
      font-size: 13px;
      font-weight: bold;
      color: #111111;
    }

    .payment-radio {
      position: absolute;
      top: 15px;
      right: 15px;
      appearance: none;
      -webkit-appearance: none;
      width: 16px;
      height: 16px;
      border: 1px solid #c0c0c0;
      border-radius: 50%;
      outline: none;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .payment-radio:checked {
      border-color: #0076f6;
    }

    .payment-radio:checked::before {
      content: "";
      width: 8px;
      height: 8px;
      background-color: #0076f6;
      border-radius: 50%;
      display: block;
    }

    /* Captcha Section */
    .captcha-wrapper {
      display: flex;
      align-items: center;
      gap: 15px;
      margin-top: 8px;
      flex-wrap: wrap;
    }

    .captcha-image-box {
      font-family: 'Courier New', Courier, monospace;
      font-size: 24px;
      font-weight: bold;
      letter-spacing: 5px;
      background: repeating-linear-gradient(
        45deg,
        #f1f1f1,
        #f1f1f1 10px,
        #e3e3e3 10px,
        #e3e3e3 20px
      );
      color: #555555;
      padding: 6px 15px;
      border: 1px dashed #aaaaaa;
      border-radius: 4px;
      user-select: none;
      position: relative;
    }

    .captcha-image-box::before {
      content: "•  . •   • .  •";
      position: absolute;
      top: 2px;
      left: 5px;
      font-size: 11px;
      color: #888888;
      letter-spacing: 12px;
      pointer-events: none;
    }

    .captcha-controls {
      display: flex;
      flex-direction: column;
      font-size: 12px;
    }

    .captcha-controls a {
      color: #0056b3;
      text-decoration: underline;
      cursor: pointer;
    }

    /* Buttons Group */
    .button-group {
      display: flex;
      gap: 10px;
      margin-top: 25px;
    }

    .btn {
      padding: 10px 20px;
      border: none;
      border-radius: 4px;
      font-size: 14px;
      font-weight: 500;
      cursor: pointer;
      text-transform: uppercase;
      transition: background-color 0.15s ease;
    }

    .btn-pay {
      background-color: #5094f3;
      color: #ffffff;
    }

    .btn-pay:hover {
      background-color: #3b82e6;
    }

    .btn-clear {
      background-color: #6c757d;
      color: #ffffff;
    }

    .btn-clear:hover {
      background-color: #5a6268;
    }

    @media (max-width: 600px) {
      .form-row {
        flex-direction: column;
        gap: 15px;
      }
      .form-group.half {
        width: 100%;
      }
    }