Calculadora de impuestos de Robux

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HTML

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>tax rbx</title>
  <link href="https://fonts.googleapis.com/css2?family=Fredoka+One&display=swap" rel="stylesheet" />
  <link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.0/css/all.min.css" rel="stylesheet" />
  <style>
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      font-family: 'Fredoka One', sans-serif;
    }

body {
      background: #0d0d0d;
      color: white;
      padding: 40px 20px;
      min-height: 100vh;
    }

.header {
      font-size: 28px;
      color: #00ff80;
      margin-bottom: 30px;
      text-align: center;
    }

.container {
      display: flex;
      justify-content: center;
      gap: 30px;
      flex-wrap: wrap-reverse;
    }

.box, .card {
      background-color: rgba(0, 0, 0, 0.65);
      padding: 24px;
      border-radius: 20px;
      border: 1px solid rgba(0, 255, 128, 0.2);
      box-shadow: 0 0 12px rgba(0, 255, 128, 0.1);
      backdrop-filter: blur(12px);
      max-width: 350px;
      width: 100%;
      text-align: center;
      flex: 1 1 300px;
    }

.input-group {
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-bottom: 20px;
    }

.text-input {
      padding: 12px;
      border-radius: 10px;
      background-color: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(0, 255, 128, 0.2);
      color: white;
      font-size: 18px;
      text-align: center;
      appearance: none;
      -moz-appearance: textfield;
    }

input::-webkit-outer-spin-button,
    input::-webkit-inner-spin-button {
      -webkit-appearance: none;
      margin: 0;
    }

.calculate-button, .profile-button {
      width: 100%;
      background-color: rgba(0, 255, 128, 0.25);
      border: 1px solid rgba(0, 255, 128, 0.4);
      color: white;
      font-size: 16px;
      padding: 12px;
      border-radius: 12px;
      cursor: pointer;
      transition: 0.3s;
    }

.calculate-button:hover, .profile-button:hover {
      background-color: rgba(0, 255, 128, 0.5);
    }

.result {
      margin-top: 20px;
      font-size: 18px;
      color: #00ff80;
      display: none;
    }

.avatar-img {
      width: 100%;
      border-radius: 16px;
      margin-bottom: 12px;
    }

.role {
      font-size: 18px;
      margin-bottom: 6px;
      color: #00ff80;
    }

.username {
      font-size: 15px;
      margin-bottom: 10px;
      color: #b6fcd5;
    }

.notification-message {
      position: fixed;
      top: 20px;
      right: 20px;
      background-color: rgba(255, 0, 0, 0.2);
      color: #ff0000;
      border: 1px solid rgba(255, 0, 0, 0.3);
      padding: 12px 16px;
      border-radius: 12px;
      font-size: 14px;
      z-index: 9999;
      display: none;
      box-shadow: 0 0 10px rgba(255, 0, 0, 0.4);
      transition: opacity 0.3s ease-in-out;
    }

.notification-message.error {
      background-color: rgba(255, 0, 0, 0.2);
      color: #ff4d4d;
      border-color: rgba(255, 0, 0, 0.3);
    }

@media (max-width: 768px) {
      .container {
        flex-direction: column;
        align-items: center;
      }

.box, .card {
        max-width: 100%;
      }
    }
  </style>
</head>
<body>
  <h1 class="header"><i class="fa-solid fa-business-time"></i> Robux Tax Calculator</h1>

<div class="container">
    <div class="card">
      <div class="role">Main Website Developer</div>
      <div class="username">@querysession on Roblox</div>
      <img src="https://tr.rbxcdn.com/30DAY-Avatar-BCCD5F8B77D685D5F66E585CBA088731-Png/352/352/Avatar/Webp/noFilter" class="avatar-img" />
      <a href="https://www.roblox.com/users/4493266990/profile" target="_blank">
        <button class="profile-button"><i class="fa-solid fa-link"></i> Access</button>
      </a>
    </div>

<div class="box">
      <div class="input-group">
        <input type="number" id="robuxInput" class="text-input" placeholder="Enter Robux amount..." />
        <button class="calculate-button" onclick="calculateRobux()">
            <i class="fa-solid fa-circle-check"></i> Calculate After Tax
        </button>
      </div>

<div class="result" id="robuxResult">
        <i class="fa-solid fa-repeat"></i>
        You will receive: <span id="robuxOutput"></span> Robux
      </div>
    </div>
  </div>

let desiredAmount = parseFloat(input);
      if (isNaN(desiredAmount) || desiredAmount <= 0) {
        showNotification("Please enter a valid Robux amount", "error");
        return;
      }

let requiredPayment = Math.ceil(desiredAmount / 0.7);
      output.textContent = requiredPayment.toLocaleString();
      resultBox.innerHTML = `<i class="fa-solid fa-repeat"></i> You must pay: <span id="robuxOutput">${requiredPayment.toLocaleString()}</span> Robux`;
      resultBox.style.display = "block";
      showNotification("Calculation complete!", "success");
    }

function showNotification(msg, type = "success") {
      const note = document.getElementById("notification");
      note.textContent = msg;
      note.className = `notification-message ${type}`;
      note.style.display = "block";

setTimeout(() => {
        note.style.opacity = "0";
        setTimeout(() => {
          note.style.display = "none";
          note.style.opacity = "1";
        }, 300);
      }, 3000);
    }
  </script>
</body>
</html>

CSS