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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>Futuristic Login - MANTIC</title>
  <link rel="stylesheet" href="style.css">
  <link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&display=swap" rel="stylesheet">
</head>
<body>
  <div class="container">
    <div class="wave-pattern">
      <div class="wave-circle wave-1"></div>
      <div class="wave-circle wave-2"></div>
      <div class="wave-circle wave-3"></div>
      <div class="wave-circle wave-4"></div>
    </div>

<div class="login-form">
      <div class="logo-container">
        <div class="logo-icon">
          <div class="geometric-shape shape-1"></div>
          <div class="geometric-shape shape-2"></div>
          <div class="geometric-shape shape-3"></div>
        </div>
        <h1 class="brand-name">MANTIC</h1>
      </div>

<button class="login-button" onclick="handleLogin()">
        <span>Login</span>
        <div class="button-glow"></div>
      </button>
    </div>
  </div>

CSS

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', sans-serif;
  height: 100vh;
  overflow: hidden;
  background: linear-gradient(135deg, #0c0c2b 0%, #1a1a3e 25%, #2d1b69 50%, #4c2a85 75%, #6b46c1 100%);
  position: relative;
}

.container {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.wave-pattern {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1;
}

.wave-circle {
  position: absolute;
  border: 2px dotted rgba(147, 197, 253, 0.3);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation: pulse 4s ease-in-out infinite;
}

.wave-1 {
  width: 200px;
  height: 200px;
  animation-delay: 0s;
}

.wave-2 {
  width: 350px;
  height: 350px;
  animation-delay: 1s;
}

.wave-3 {
  width: 500px;
  height: 500px;
  animation-delay: 2s;
}

.wave-4 {
  width: 650px;
  height: 650px;
  animation-delay: 3s;
}

@keyframes pulse {
  0%, 100% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.8);
  }
  50% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}

.login-form {
  background: rgba(15, 23, 42, 0.7);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(148, 163, 184, 0.1);
  border-radius: 24px;
  padding: 48px 40px;
  width: 400px;
  text-align: center;
  position: relative;
  z-index: 2;
  box-shadow: 
    0 0 60px rgba(59, 130, 246, 0.15),
    0 25px 50px rgba(0, 0, 0, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.logo-container {
  margin-bottom: 40px;
}

.logo-icon {
  position: relative;
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.geometric-shape {
  position: absolute;
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  border-radius: 8px;
}

.shape-1 {
  width: 40px;
  height: 40px;
  transform: rotate(45deg);
  z-index: 3;
}

.shape-2 {
  width: 60px;
  height: 60px;
  transform: rotate(15deg);
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.6), rgba(139, 92, 246, 0.6));
  z-index: 2;
}

.shape-3 {
  width: 70px;
  height: 70px;
  transform: rotate(-15deg);
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.3), rgba(139, 92, 246, 0.3));
  z-index: 1;
}

.brand-name {
  font-size: 32px;
  font-weight: 600;
  color: white;
  letter-spacing: 4px;
  text-shadow: 0 0 20px rgba(59, 130, 246, 0.5);
  margin: 0;
}

.input-container {
  margin-bottom: 32px;
}

.input-field {
  position: relative;
  margin-bottom: 20px;
}

.input-field:last-child {
  margin-bottom: 0;
}

.input-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: rgba(148, 163, 184, 0.6);
  z-index: 2;
}

input {
  width: 100%;
  height: 56px;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 16px;
  padding: 0 20px 0 50px;
  font-size: 16px;
  color: white;
  outline: none;
  transition: all 0.3s ease;
  box-shadow: 
    0 4px 12px rgba(0, 0, 0, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

input::placeholder {
  color: rgba(148, 163, 184, 0.5);
}

input:focus {
  border-color: rgba(59, 130, 246, 0.5);
  box-shadow: 
    0 4px 12px rgba(0, 0, 0, 0.2),
    0 0 0 3px rgba(59, 130, 246, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.login-button {
  width: 100%;
  height: 56px;
  background: linear-gradient(135deg, #3b82f6, #2563eb);
  border: none;
  border-radius: 16px;
  color: white;
  font-size: 18px;
  font-weight: 500;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: all 0.3s ease;
  box-shadow: 
    0 8px 25px rgba(59, 130, 246, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.login-button:hover {
  transform: translateY(-2px);
  box-shadow: 
    0 12px 35px rgba(59, 130, 246, 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.login-button:active {
  transform: translateY(0);
}

.login-button span {
  position: relative;
  z-index: 2;
}

.button-glow {
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: left 0.6s ease;
}

.login-button:hover .button-glow {
  left: 100%;
}

@media (max-width: 480px) {
  .login-form {
    width: 90%;
    padding: 32px 24px;
  }

.wave-1 { width: 150px; height: 150px; }
  .wave-2 { width: 250px; height: 250px; }
  .wave-3 { width: 350px; height: 350px; }
  .wave-4 { width: 450px; height: 450px; }
}

JS

// Enhanced login functionality with animations and validation
function handleLogin() {
  const username = document.getElementById('username').value;
  const password = document.getElementById('password').value;
  const button = document.querySelector('.login-button');

// Basic validation
  if (!username.trim()) {
    showError('Please enter your username');
    highlightField('username');
    return;
  }

if (!password.trim()) {
    showError('Please enter your password');
    highlightField('password');
    return;
  }

// Simulate login process
  button.innerHTML = '<span>Logging in...</span><div class="button-glow"></div>';
  button.disabled = true;

setTimeout(() => {
    // Simulate successful login
    button.innerHTML = '<span>Welcome!</span><div class="button-glow"></div>';
    button.style.background = 'linear-gradient(135deg, #10b981, #059669)';

setTimeout(() => {
      // Reset button after demo
      button.innerHTML = '<span>Login</span><div class="button-glow"></div>';
      button.style.background = 'linear-gradient(135deg, #3b82f6, #2563eb)';
      button.disabled = false;

// Clear fields for demo
      document.getElementById('username').value = '';
      document.getElementById('password').value = '';
    }, 2000);
  }, 1500);
}

function showError(message) {
  // Create temporary error message
  const existingError = document.querySelector('.error-message');
  if (existingError) {
    existingError.remove();
  }

const errorDiv = document.createElement('div');
  errorDiv.className = 'error-message';
  errorDiv.textContent = message;
  errorDiv.style.cssText = `
    color: #ef4444;
    font-size: 14px;
    margin-top: 8px;
    opacity: 0;
    transition: opacity 0.3s ease;
  `;

const inputContainer = document.querySelector('.input-container');
  inputContainer.appendChild(errorDiv);

setTimeout(() => errorDiv.style.opacity = '1', 10);
  setTimeout(() => {
    if (errorDiv.parentNode) {
      errorDiv.style.opacity = '0';
      setTimeout(() => errorDiv.remove(), 300);
    }
  }, 3000);
}

function highlightField(fieldId) {
  const field = document.getElementById(fieldId);
  const originalBorderColor = field.style.borderColor;

field.style.borderColor = '#ef4444';
  field.style.boxShadow = '0 0 0 3px rgba(239, 68, 68, 0.1)';

setTimeout(() => {
    field.style.borderColor = originalBorderColor;
    field.style.boxShadow = '';
  }, 2000);
}

// Add enter key support
document.addEventListener('DOMContentLoaded', function() {
  const inputs = document.querySelectorAll('input');

inputs.forEach(input => {
    input.addEventListener('keypress', function(e) {
      if (e.key === 'Enter') {
        handleLogin();
      }
    });

// Add focus/blur effects
    input.addEventListener('focus', function() {
      this.parentElement.style.transform = 'translateY(-2px)';
    });

input.addEventListener('blur', function() {
      this.parentElement.style.transform = 'translateY(0)';
    });
  });

// Add mouse move effect for subtle interactivity
  const loginForm = document.querySelector('.login-form');

document.addEventListener('mousemove', function(e) {
    const rect = loginForm.getBoundingClientRect();
    const centerX = rect.left + rect.width / 2;
    const centerY = rect.top + rect.height / 2;

const deltaX = (e.clientX - centerX) / 50;
    const deltaY = (e.clientY - centerY) / 50;

loginForm.style.transform = `translate(${deltaX}px, ${deltaY}px)`;
  });
});

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