Formulaire de connexion animé

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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>Animated Login Form</title>
  <style>
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    }

body {
      display: flex;
      justify-content: center;
      align-items: center;
      min-height: 100vh;
      background: linear-gradient(45deg, #ff9a9e, #fad0c4, #a1c4fd);
      background-size: 400% 400%;
      animation: gradientBG 15s ease infinite;
      overflow: hidden;
    }

@keyframes gradientBG {
      0% { background-position: 0% 50%; }
      50% { background-position: 100% 50%; }
      100% { background-position: 0% 50%; }
    }

.container {
      position: relative;
      width: 400px;
      height: 500px;
      background: rgba(255, 255, 255, 0.1);
      backdrop-filter: blur(10px);
      border-radius: 20px;
      display: flex;
      justify-content: center;
      align-items: center;
      overflow: hidden;
      border: 1px solid rgba(255, 255, 255, 0.2);
      box-shadow: 0 15px 35px rgba(0, 0, 0, 0.05);
      transform-style: preserve-3d;
      perspective: 1000px;
      animation: containerFloat 6s ease-in-out infinite;
    }

@keyframes containerFloat {
      0%, 100% { transform: translateY(0px); }
      50% { transform: translateY(-20px); }
    }

.container::before {
      content: '';
      position: absolute;
      top: -50%;
      left: -50%;
      width: 380px;
      height: 420px;
      background: linear-gradient(0deg, transparent, 
                 rgba(255, 255, 255, 0.4), rgba(255, 255, 255, 0.4));
      transform-origin: bottom right;
      animation: animate 6s linear infinite;
    }

.container::after {
      content: '';
      position: absolute;
      top: -50%;
      left: -50%;
      width: 380px;
      height: 420px;
      background: linear-gradient(0deg, transparent, 
                 rgba(255, 255, 255, 0.4), rgba(255, 255, 255, 0.4));
      transform-origin: bottom right;
      animation: animate 6s linear infinite;
      animation-delay: -3s;
    }

@keyframes animate {
      0% {
        transform: rotate(0deg);
      }
      100% {
        transform: rotate(360deg);
      }
    }

.form {
      position: relative;
      width: 100%;
      height: 100%;
      padding: 40px;
      z-index: 10;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
    }

.logo {
      text-align: center;
      margin-bottom: 30px;
    }

.logo span {
      font-size: 2.5em;
      font-weight: 700;
      letter-spacing: 2px;
      background: linear-gradient(45deg, #ff9a9e, #a1c4fd);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

.inputBox {
      position: relative;
      width: 100%;
      margin-top: 30px;
    }

.inputBox input {
      position: relative;
      width: 100%;
      padding: 15px 20px;
      outline: none;
      font-size: 1em;
      color: #333;
      border-radius: 10px;
      border: none;
      background: rgba(255, 255, 255, 0.7);
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
      transition: 0.5s;
    }

.inputBox span {
      position: absolute;
      left: 0;
      padding: 15px 20px;
      pointer-events: none;
      font-size: 1em;
      color: #666;
      transition: 0.5s;
    }

.inputBox input:valid ~ span,
    .inputBox input:focus ~ span {
      color: #a1c4fd;
      transform: translateX(10px) translateY(-7px);
      font-size: 0.75em;
      padding: 0 10px;
      background: white;
      border-radius: 10px;
    }

.inputBox input:valid,
    .inputBox input:focus {
      border-bottom: 2px solid #a1c4fd;
    }

.enter {
      position: relative;
      width: 100%;
      height: 50px;
      margin-top: 40px;
      border-radius: 10px;
      cursor: pointer;
      font-size: 1em;
      font-weight: 600;
      letter-spacing: 2px;
      transition: 0.5s;
      border: none;
      overflow: hidden;
      background: linear-gradient(90deg, #ff9a9e, #a1c4fd);
      color: white;
    }

.enter:hover {
      transform: scale(1.05);
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    }

.enter::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 50%;
      height: 100%;
      background: rgba(255, 255, 255, 0.1);
    }

.floating-elements {
      position: absolute;
      width: 100%;
      height: 100%;
      overflow: hidden;
      z-index: 0;
    }

.floating-elements div {
      position: absolute;
      display: block;
      width: 20px;
      height: 20px;
      background: rgba(255, 255, 255, 0.2);
      border-radius: 50%;
      animation: floatUp 15s linear infinite;
      bottom: -150px;
    }

.floating-elements div:nth-child(1) {
      left: 20%;
      width: 15px;
      height: 15px;
      animation-delay: 0s;
      animation-duration: 12s;
    }

.floating-elements div:nth-child(2) {
      left: 35%;
      width: 25px;
      height: 25px;
      animation-delay: 2s;
      animation-duration: 16s;
    }

.floating-elements div:nth-child(3) {
      left: 55%;
      width: 20px;
      height: 20px;
      animation-delay: 4s;
      animation-duration: 13s;
    }

.floating-elements div:nth-child(4) {
      left: 70%;
      width: 30px;
      height: 30px;
      animation-delay: 1s;
      animation-duration: 15s;
    }

.floating-elements div:nth-child(5) {
      left: 85%;
      width: 15px;
      height: 15px;
      animation-delay: 7s;
      animation-duration: 12s;
    }

@keyframes floatUp {
      0% {
        transform: translateY(0) rotate(0deg);
        opacity: 0.5;
        border-radius: 0;
      }
      100% {
        transform: translateY(-1000px) rotate(720deg);
        opacity: 0;
        border-radius: 50%;
      }
    }

.links {
      position: relative;
      width: 100%;
      display: flex;
      justify-content: space-between;
      margin-top: 30px;
    }

.links a {
      color: #666;
      text-decoration: none;
      font-size: 0.9em;
      transition: 0.3s;
    }

.links a:hover {
      color: #a1c4fd;
    }
  </style>
</head>
<body>
  <div class="container">
    <div class="floating-elements">
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
    </div>
    <div class="form">
      <div class="logo">
        <span>LOGIX</span>
      </div>
      <div class="inputBox">
        <input type="text" required="required">
        <span>Username</span>
      </div>
      <div class="inputBox">
        <input type="password" required="required">
        <span>Password</span>
      </div>
      <button class="enter">LOGIN</button>
      <div class="links">
        <a href="#">Forgot Password?</a>
        <a href="#">Sign Up</a>
      </div>
    </div>
  </div>

CSS