Plantilla HTML/CSS de formulario de inicio de sesión y registro

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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>Login / Sign Up</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      font-family: system-ui, sans-serif;
    }
    body {
      height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      background: linear-gradient(135deg, #1e3c72, #2a5298);
    }

.container {
      width: 360px;
      background: #fff;
      border-radius: 16px;
      box-shadow: 0 12px 25px rgba(0,0,0,0.25);
      overflow: hidden;
      animation: fadeIn 0.6s ease;
    }

.tabs {
      display: flex;
      cursor: pointer;
    }
    .tabs button {
      flex: 1;
      padding: 14px;
      border: none;
      background: #f0f0f0;
      font-size: 16px;
      font-weight: 600;
      transition: background 0.3s ease;
    }
    .tabs button.active {
      background: #2a5298;
      color: #fff;
    }

.form {
      padding: 24px;
      display: none;
      animation: slide 0.4s ease;
    }
    .form.active { display: block; }

.form h2 {
      margin-bottom: 18px;
      color: #2a5298;
      font-size: 22px;
      text-align: center;
    }

.input-group {
      margin-bottom: 16px;
    }
    .input-group label {
      font-size: 14px;
      color: #333;
      display: block;
      margin-bottom: 6px;
    }
    .input-group input {
      width: 100%;
      padding: 10px;
      border: 1px solid #bbb;
      border-radius: 8px;
      font-size: 15px;
    }

.form button {
      width: 100%;
      padding: 12px;
      background: #2a5298;
      color: #fff;
      font-size: 16px;
      border: none;
      border-radius: 8px;
      cursor: pointer;
      transition: background 0.3s ease;
    }
    .form button:hover {
      background: #1e3c72;
    }

.extra {
      margin-top: 12px;
      text-align: center;
      font-size: 13px;
      color: #555;
    }
    .extra a {
      color: #2a5298;
      text-decoration: none;
      font-weight: 500;
    }

@keyframes fadeIn {
      from { opacity: 0; transform: scale(0.9);}
      to { opacity: 1; transform: scale(1);}
    }
    @keyframes slide {
      from { opacity: 0; transform: translateY(12px);}
      to { opacity: 1; transform: translateY(0);}
    }
  </style>
</head>
<body>

<div class="container">
    <div class="tabs">
      <button class="tab active" onclick="showForm('login')">Login</button>
      <button class="tab" onclick="showForm('signup')">Sign Up</button>
    </div>

<form class="form active" id="login">
      <h2>Welcome Back</h2>
      <div class="input-group">
        <label>Email</label>
        <input type="email" placeholder="Enter your email" required>
      </div>
      <div class="input-group">
        <label>Password</label>
        <input type="password" placeholder="Enter your password" required>
      </div>
      <button type="submit">Login</button>
      <div class="extra">
        <a href="#">Forgot Password?</a>
      </div>
    </form>

<form class="form" id="signup">
      <h2>Create Account</h2>
      <div class="input-group">
        <label>Username</label>
        <input type="text" placeholder="Choose a username" required>
      </div>
      <div class="input-group">
        <label>Email</label>
        <input type="email" placeholder="Enter your email" required>
      </div>
      <div class="input-group">
        <label>Password</label>
        <input type="password" placeholder="Create a password" required>
      </div>
      <button type="submit">Sign Up</button>
    </form>
  </div>

document.getElementById(formId).classList.add('active');
    event.target.classList.add('active');
  }
</script>

</body>
</html>

CSS

/* Reset */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: "Poppins", system-ui, sans-serif;
}

/* Background with gradient + glow */
body {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
  overflow: hidden;
}

/* Decorative glowing orbs */
body::before, body::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  z-index: 0;
}
body::before {
  width: 400px;
  height: 400px;
  top: -100px;
  left: -100px;
  background: rgba(0, 212, 255, 0.6);
}
body::after {
  width: 400px;
  height: 400px;
  bottom: -120px;
  right: -100px;
  background: rgba(255, 0, 180, 0.5);
}

/* Container (glass effect) */
.container {
  width: 380px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 20px;
  padding-bottom: 20px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  position: relative;
  z-index: 1;
  overflow: hidden;
  animation: fadeIn 0.8s ease;
}

/* Tabs */
.tabs {
  display: flex;
}
.tabs button {
  flex: 1;
  padding: 14px;
  border: none;
  background: transparent;
  font-size: 16px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.65);
  transition: all 0.3s ease;
  cursor: pointer;
}
.tabs button.active {
  color: #fff;
  background: linear-gradient(90deg, #00d4ff, #ff00b4);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-size: 17px;
}

/* Forms */
.form {
  padding: 24px;
  display: none;
  animation: slide 0.4s ease;
}
.form.active { display: block; }

.form h2 {
  margin-bottom: 18px;
  font-size: 24px;
  text-align: center;
  background: linear-gradient(90deg, #00d4ff, #ff00b4);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Input groups */
.input-group {
  margin-bottom: 18px;
}
.input-group label {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.7);
  display: block;
  margin-bottom: 6px;
}
.input-group input {
  width: 100%;
  padding: 12px;
  border: none;
  border-radius: 10px;
  font-size: 15px;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  outline: none;
  transition: background 0.3s ease, box-shadow 0.3s ease;
}
.input-group input:focus {
  background: rgba(255, 255, 255, 0.2);
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.8);
}

/* Buttons */
.form button {
  width: 100%;
  padding: 12px;
  background: linear-gradient(90deg, #00d4ff, #ff00b4);
  color: #fff;
  font-size: 16px;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.3s ease;
}
.form button:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.7),
              0 0 30px rgba(255, 0, 180, 0.6);
}

/* Extra links */
.extra {
  margin-top: 14px;
  text-align: center;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
}
.extra a {
  color: #00d4ff;
  text-decoration: none;
  font-weight: 500;
}
.extra a:hover {
  text-decoration: underline;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: scale(0.9);}
  to { opacity: 1; transform: scale(1);}
}
@keyframes slide {
  from { opacity: 0; transform: translateY(15px);}
  to { opacity: 1; transform: translateY(0);}
}

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