Formulário de login e cadastro em HTML/CSS

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HTML

<!DOCTYPE html>
<html lang="fr">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Dark Login | Sign Up</title>
  <link rel="stylesheet" href="style.css">
</head>
<body>

<div class="form-box" id="login">
      <h2>Connexion</h2>
      <div class="input-box">
        
        <svg viewBox="0 0 24 24">
          <path d="M20 4H4C2.897 4 2 4.897 2 6v12c0 
          1.103.897 2 2 2h16c1.103 0 2-.897 
          2-2V6c0-1.103-.897-2-2-2zm0 
          2v.511l-8 5.333-8-5.333V6h16zM4 
          18V8.489l8 5.333 8-5.333V18H4z"/>
        </svg>
        <input type="email" placeholder="Email">
      </div>
      <div class="input-box">
        
        <svg viewBox="0 0 24 24">
          <path d="M17 8h-1V6a4 4 0 00-8 
          0v2H7c-1.103 0-2 .897-2 
          2v10c0 1.103.897 2 2 
          2h10c1.103 0 2-.897 
          2-2V10c0-1.103-.897-2-2-2zM9 
          6a2 2 0 014 0v2H9V6zm8 
          14H7V10h10v10z"/>
        </svg>
        <input type="password" placeholder="Mot de passe">
      </div>
      <button class="btn">Se connecter</button>
      <p class="switch">
        Pas de compte ? 
        <button class="link-btn" onclick="toggleForm()">Inscription</button>
      </p>
    </div>

<div class="form-box" id="signup">
      <h2>Inscription</h2>
      <div class="input-box">
        
        <svg viewBox="0 0 24 24">
          <path d="M12 12c2.7 0 5-2.3 5-5s-2.3-5-5-5-5 
          2.3-5 5 2.3 5 5 5zm0 
          2c-3.3 0-10 1.7-10 5v3h20v-3c0-3.3-6.7-5-10-5z"/>
        </svg>
        <input type="text" placeholder="Nom d’utilisateur">
      </div>
      <div class="input-box">
        
        <svg viewBox="0 0 24 24">
          <path d="M20 4H4C2.897 4 2 4.897 2 6v12c0 
          1.103.897 2 2 2h16c1.103 0 2-.897 
          2-2V6c0-1.103-.897-2-2-2zm0 
          2v.511l-8 5.333-8-5.333V6h16zM4 
          18V8.489l8 5.333 8-5.333V18H4z"/>
        </svg>
        <input type="email" placeholder="Email">
      </div>
      <div class="input-box">
        
        <svg viewBox="0 0 24 24">
          <path d="M17 8h-1V6a4 4 0 00-8 
          0v2H7c-1.103 0-2 .897-2 
          2v10c0 1.103.897 2 2 
          2h10c1.103 0 2-.897 
          2-2V10c0-1.103-.897-2-2-2zM9 
          6a2 2 0 014 0v2H9V6zm8 
          14H7V10h10v10z"/>
        </svg>
        <input type="password" placeholder="Mot de passe">
      </div>
      <button class="btn">Créer un compte</button>
      <p class="switch">
        Déjà inscrit ? 
        <button class="link-btn" onclick="toggleForm()">Connexion</button>
      </p>
    </div>

</div>

<script>
    const container = document.getElementById('container');
    function toggleForm() {
      container.classList.toggle('active');
    }
  </script>

</body>
</html>

CSS

/* ---- RESET ---- */
* { 
  margin: 0; 
  padding: 0; 
  box-sizing: border-box; 
  font-family: 'Segoe UI', sans-serif; 
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background: radial-gradient(circle at top, #0e0e0e, #050505);
  color: #fff;
  overflow: hidden;
}

/* ---- CONTAINER ---- */
.container {
  position: relative;
  width: 380px;
  height: 520px;
  background: rgba(20,20,20,0.95);
  border-radius: 20px;
  box-shadow: 0 0 40px rgba(0, 255, 200, 0.35);
  overflow: hidden;
  backdrop-filter: blur(10px);
}

/* ---- FORM ---- */
.form-box {
  position: absolute;
  width: 100%;
  height: 100%;
  padding: 40px;
  transition: 0.6s ease-in-out;
  opacity: 0;
  transform: translateX(100%);
}

.form-box h2 {
  text-align: center;
  margin-bottom: 25px;
  font-size: 2rem;
  letter-spacing: 1.5px;
  color: #00ffc6;
  text-shadow: 0 0 12px rgba(0, 255, 200, 0.7);
}

/* ---- INPUTS ---- */
.input-box {
  position: relative;
  width: 100%;
  margin: 20px 0;
}

.input-box svg {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  fill: #00ffc6;
  opacity: 0.8;
  pointer-events: none;
}

.input-box input {
  width: 100%;
  padding: 12px 15px 12px 45px;
  border: none;
  border-radius: 10px;
  outline: none;
  font-size: 1rem;
  background: #111;
  color: #fff;
  transition: 0.3s;
  box-shadow: inset 0 0 5px rgba(0, 255, 200, 0.3);
}

.input-box input:focus {
  background: #0b0b0b;
  box-shadow: 0 0 15px #00ffc6;
  border: 1px solid #00ffc6;
}

/* ---- PASSWORD ANIMATION ---- */
.input-box input[type="password"]:focus {
  animation: pulse 1s infinite alternate;
}

@keyframes pulse {
  from { box-shadow: 0 0 10px #00ffc6; }
  to { box-shadow: 0 0 20px #00ffc6; }
}

/* ---- BUTTON ---- */
.btn {
  width: 100%;
  padding: 14px;
  margin-top: 25px;
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: bold;
  color: #000;
  background: linear-gradient(135deg, #00ffc6, #00e6ac);
  cursor: pointer;
  transition: all 0.3s ease-in-out;
  box-shadow: 0 0 15px rgba(0, 255, 200, 0.5);
}

.btn:hover {
  transform: scale(1.03);
  background: linear-gradient(135deg, #00e6ac, #00ffc6);
  box-shadow: 0 0 25px rgba(0, 255, 200, 0.8);
}

/* ---- SWITCH ---- */
.switch {
  margin-top: 25px;
  text-align: center;
  font-size: 0.9rem;
  color: #ccc;
}

/* ---- LINK BUTTON ---- */
.link-btn {
  background: none;
  border: none;
  color: #00ffc6;
  font-weight: bold;
  font-size: 0.95rem;
  cursor: pointer;
  transition: 0.2s;
}

.link-btn:hover {
  color: #00e6ac;
  text-decoration: underline;
}

/* ---- FORM POSITIONS ---- */
#login {
  left: 0;
  transform: translateX(0);
  opacity: 1;
  transition: all 0.6s ease-in-out;
}

#signup {
  left: 0; /* même position que login */
  transform: translateX(100%);
  opacity: 0;
  transition: all 0.6s ease-in-out;
}

.container.active #login {
  transform: translateX(-100%);
  opacity: 0;
}

.container.active #signup {
  transform: translateX(0);
  opacity: 1;
}

Formulário de login e cadastro em HTML/CSS

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