Formulario de inicio de sesión moderno + barra lateral deslizante

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Modern Login with Sidebar</title>
<style>
  /* Reset & basics */
  * {
    margin: 0; padding: 0; box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  }

body, html {
    height: 100%;
    background: #f0f2f5;
    overflow-x: hidden;
  }

/* Sidebar styles */
  .sidebar {
    position: fixed;
    top: 0; left: 0;
    height: 100vh;
    width: 250px;
    background: #4f46e5;
    color: white;
    padding: 2rem 1.5rem;
    box-shadow: 2px 0 15px rgba(79, 70, 229, 0.5);
    transform: translateX(-260px);
    transition: transform 0.4s ease;
    z-index: 1000;
    display: flex;
    flex-direction: column;
  }

.sidebar.active {
    transform: translateX(0);
  }

.sidebar h2 {
    margin-bottom: 2rem;
    font-weight: 700;
  }

.sidebar a {
    color: white;
    text-decoration: none;
    margin-bottom: 1.2rem;
    font-weight: 600;
    font-size: 1.1rem;
    transition: color 0.3s ease;
  }

.sidebar a:hover {
    color: #a78bfa;
  }

/* Toggle button */
  .toggle-btn {
    position: fixed;
    top: 20px; left: 20px;
    background: #4f46e5;
    border: none;
    color: white;
    padding: 0.6rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1.4rem;
    box-shadow: 0 5px 15px rgba(79, 70, 229, 0.4);
    z-index: 1100;
    transition: background 0.3s ease;
  }

.toggle-btn:hover {
    background: #7c3aed;
  }

/* Login form container */
  .login-container {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
  }

.login-form {
    background: white;
    padding: 3rem 2.5rem;
    border-radius: 12px;
    box-shadow: 0 15px 30px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 400px;
  }

.login-form h2 {
    margin-bottom: 2rem;
    color: #4f46e5;
    font-weight: 700;
    text-align: center;
  }

.form-group {
    margin-bottom: 1.5rem;
  }

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: #333;
  }

.form-group input {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1.8px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
  }

.form-group input:focus {
    outline: none;
    border-color: #7c3aed;
    box-shadow: 0 0 6px #a78bfa;
  }

button.login-btn {
    width: 100%;
    padding: 0.9rem;
    background: #4f46e5;
    border: none;
    border-radius: 8px;
    color: white;
    font-weight: 700;
    font-size: 1.1rem;
    cursor: pointer;
    box-shadow: 0 8px 15px rgba(79, 70, 229, 0.5);
    transition: background 0.3s ease;
  }

button.login-btn:hover {
    background: #7c3aed;
  }

/* Responsive tweaks */
  @media (max-width: 480px) {
    .login-form {
      padding: 2rem 1.5rem;
      width: 90%;
    }
    .toggle-btn {
      font-size: 1.2rem;
      padding: 0.5rem 0.8rem;
    }
  }
</style>
</head>
<body>

<div class="sidebar" id="sidebar">
  <h2>Menu</h2>
  <a href="#">Home</a>
  <a href="#">Features</a>
  <a href="#">Pricing</a>
  <a href="#">About</a>
  <a href="#">Contact</a>
</div>

<div class="login-container">
  <form class="login-form" id="loginForm">
    <h2>Login</h2>
    <div class="form-group">
      <label for="email">Email Address</label>
      <input type="email" id="email" required placeholder="you@example.com" />
    </div>
    <div class="form-group">
      <label for="password">Password</label>
      <input type="password" id="password" required placeholder="Enter your password" />
    </div>
    <button type="submit" class="login-btn">Sign In</button>
  </form>
</div>

toggleBtn.addEventListener('click', () => {
    sidebar.classList.toggle('active');
  });

// Optional: close sidebar when clicking outside on small screens
  document.addEventListener('click', (e) => {
    if (!sidebar.contains(e.target) && !toggleBtn.contains(e.target)) {
      sidebar.classList.remove('active');
    }
  });

// Form submission
  document.getElementById('loginForm').addEventListener('submit', e => {
    e.preventDefault();
    alert('Login submitted!');
    e.target.reset();
  });
</script>

</body>
</html>

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