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HTML

<!DOCTYPE html>
<html lang="es">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Panel de Registro</title>
    <style>
        body {
            margin: 0;
            padding: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            background-color: #1a1a1a;
            font-family: Arial, sans-serif;
            color: white;
        }

.neon-panel {
            width: 350px;
            padding: 40px;
            border-radius: 10px;
            background-color: rgba(0, 0, 0, 0.6);
            box-shadow: 0 0 20px #00ffcc, 0 0 30px #00ffcc;
            position: relative;
            overflow: hidden;
            animation: neon-border 5s infinite;
        }

@keyframes neon-border {
            0% { box-shadow: 0 0 20px red, 0 0 30px red; }
            20% { box-shadow: 0 0 20px yellow, 0 0 30px yellow; }
            40% { box-shadow: 0 0 20px green, 0 0 30px green; }
            60% { box-shadow: 0 0 20px blue, 0 0 30px blue; }
            80% { box-shadow: 0 0 20px purple, 0 0 30px purple; }
            100% { box-shadow: 0 0 20px pink, 0 0 30px pink; }
        }

.neon-panel:before {
            content: '';
            position: absolute;
            top: 0;
            left: -50%;
            width: 200%;
            height: 100%;
            background: linear-gradient(120deg, transparent, rgba(0, 255, 204, 0.5), transparent);
            transform: skewX(0deg);
            transition: 0.5s;
        }

.neon-panel:hover:before {
            transform: skewX(20deg) translateX(20%);
        }

h2 {
            text-align: center;
            margin-bottom: 20px;
            animation: neon-text 5s infinite;
            text-shadow: 0 0 10px #00ffcc, 0 0 20px #00ffcc;
        }

@keyframes neon-text {
            0% { color: red; }
            20% { color: yellow; }
            40% { color: green; }
            60% { color: blue; }
            80% { color: purple; }
            100% { color: pink; }
        }

.input-container {
            margin-bottom: 20px;
            position: relative;
        }

.input-container input {
            width: 100%;
            padding: 10px;
            background: transparent;
            border: none;
            border-bottom: 2px solid #00ffcc;
            outline: none;
            color: white;
            font-size: 16px;
            animation: neon-text 5s infinite;
        }

.input-container label {
            position: absolute;
            top: 0;
            left: 0;
            padding: 10px 0;
            pointer-events: none;
            transition: 0.5s;
            animation: neon-text 5s infinite;
        }

.input-container input:focus ~ label,
        .input-container input:valid ~ label {
            top: -20px;
            left: 0;
            font-size: 12px;
        }

.neon-button {
            width: 100%;
            padding: 10px;
            background-color: #00ffcc;
            border: none;
            border-radius: 25px;
            color: black;
            font-size: 16px;
            cursor: pointer;
            transition: 0.5s;
            box-shadow: 0 0 10px #00ffcc, 0 0 20px #00ffcc;
            animation: neon-text 5s infinite;
        }

.neon-button:hover {
            background-color: #ff00ff;
            box-shadow: 0 0 20px #ff00ff, 0 0 30px #ff00ff;
            color: white;
        }
    </style>
</head>
<body>

<div class="neon-panel">
        <h2>Crear Cuenta</h2>
        <form>
            <div class="input-container">
                <input type="text" required>
                <label>Nombre de usuario</label>
            </div>
            <div class="input-container">
                <input type="email" required>
                <label>Correo electrónico</label>
            </div>
            <div class="input-container">
                <input type="password" required>
                <label>Contraseña</label>
            </div>
            <button class="neon-button">Registrarse</button>
        </form>
    </div>

</body>
</html>

CSS