Design de formulário de login animado em CSS

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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Modern Login</title>
    <style>
        @import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;600&display=swap');

* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Poppins', sans-serif;
        }

body {
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            background: #1c1c1c;
            /* Deep dark background */
            overflow: hidden;
        }

/* The container for the spinning effect */
        .box {
            position: relative;
            width: 380px;
            height: 420px;
            background: #1c1c1c;
            border-radius: 8px;
            overflow: hidden;
        }

/* The spinning gradient beam */
        .box::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 380px;
            height: 420px;
            background: linear-gradient(0deg, transparent, transparent, #45f3ff, #45f3ff, #45f3ff);
            z-index: 1;
            transform-origin: bottom right;
            animation: animate 6s linear infinite;
        }

/* The second beam for color contrast (Magenta) */
        .box::after {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 380px;
            height: 420px;
            background: linear-gradient(0deg, transparent, transparent, #ff2770, #ff2770, #ff2770);
            z-index: 1;
            transform-origin: bottom right;
            animation: animate 6s linear infinite;
            animation-delay: -3s;
            /* Delays it to be on the opposite side */
        }

/* The inner form container overlay */
        .form-content {
            position: absolute;
            inset: 4px;
            /* Creates the border thickness */
            background: #222;
            /* Slightly lighter than body */
            padding: 50px 40px;
            border-radius: 8px;
            z-index: 2;
            display: flex;
            flex-direction: column;
        }

@keyframes animate {
            0% {
                transform: rotate(0deg);
            }

100% {
                transform: rotate(360deg);
            }
        }

h2 {
            color: #fff;
            font-weight: 500;
            text-align: center;
            letter-spacing: 0.1em;
        }

/* Input Styling with Floating Animation */
        .inputBox {
            position: relative;
            width: 100%;
            margin-top: 35px;
        }

.inputBox input {
            position: relative;
            width: 100%;
            padding: 20px 10px 10px;
            background: transparent;
            outline: none;
            border: none;
            box-shadow: none;
            color: #23242a;
            font-size: 1em;
            letter-spacing: 0.05em;
            transition: 0.5s;
            z-index: 10;
        }

.inputBox span {
            position: absolute;
            left: 0;
            padding: 20px 0px 10px;
            pointer-events: none;
            color: #8f8f8f;
            font-size: 1em;
            letter-spacing: 0.05em;
            transition: 0.5s;
        }

/* Logic for floating label */
        .inputBox input:valid~span,
        .inputBox input:focus~span {
            color: #fff;
            font-size: 0.75em;
            transform: translateY(-34px);
        }

/* The animated underline */
        .inputBox i {
            position: absolute;
            left: 0;
            bottom: 0;
            width: 100%;
            height: 2px;
            background: #fff;
            border-radius: 4px;
            overflow: hidden;
            transition: 0.5s;
            pointer-events: none;
        }

.inputBox input:valid~i,
        .inputBox input:focus~i {
            height: 44px;
            /* Expands to fill background */
        }

/* Links styling */
        .links {
            display: flex;
            justify-content: space-between;
        }

.links a {
            margin: 10px 0;
            font-size: 0.75em;
            color: #8f8f8f;
            text-decoration: none;
        }

.links a:hover,
        .links a:nth-child(2) {
            color: #fff;
        }

/* Submit Button */
        input[type="submit"] {
            border: none;
            outline: none;
            padding: 9px 25px;
            background: #fff;
            cursor: pointer;
            font-size: 0.9em;
            border-radius: 4px;
            font-weight: 600;
            width: 100px;
            margin-top: 10px;
        }

input[type="submit"]:active {
            opacity: 0.8;
        }

/* The Glow Effect behind the box */
        .border-line {
            position: absolute;
            top: 0;
            inset: 0;
        }

/* Adds a subtle pulse to the form */
        .box:hover .form-content {
            background: #25252b;
            transition: 0.5s;
        }
    </style>
</head>

<body>

<div class="box">
        <div class="form-content">
            <h2>Sign In</h2>
            <form>
                <div class="inputBox">
                    <input type="text" required="required">
                    <span>Username</span>
                    <i></i>
                </div>
                <div class="inputBox">
                    <input type="password" required="required">
                    <span>Password</span>
                    <i></i>
                </div>
                <div class="links">
                    <a href="#">Forgot Password</a>
                    <a href="#">Signup</a>
                </div>
                <input type="submit" value="Login">
            </form>
        </div>
    </div>

</body>

</html>

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