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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.container {
  width: 100%;
  max-width: 400px;
}

.login-box {
  background: white;
  border-radius: 10px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
  padding: 40px;
}

h1 {
  color: #667eea;
  font-size: 32px;
  text-align: center;
  margin-bottom: 5px;
}

.subtitle {
  color: #666;
  text-align: center;
  margin-bottom: 30px;
  font-size: 14px;
}

.form {
  margin-bottom: 20px;
}

.form.hidden {
  display: none;
}

h2 {
  color: #333;
  font-size: 24px;
  margin-bottom: 20px;
  text-align: center;
}

.form-group {
  margin-bottom: 20px;
}

label {
  display: block;
  margin-bottom: 5px;
  color: #333;
  font-weight: 500;
  font-size: 14px;
}

input[type="text"],
input[type="password"] {
  width: 100%;
  padding: 12px;
  border: 2px solid #ddd;
  border-radius: 5px;
  font-size: 14px;
  transition: border-color 0.3s;
}

input[type="text"]:focus,
input[type="password"]:focus {
  outline: none;
  border-color: #667eea;
}

.btn {
  width: 100%;
  padding: 12px;
  border: none;
  border-radius: 5px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.3s, transform 0.1s;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: #667eea;
  color: white;
}

.btn-primary:hover {
  background: #5568d3;
}

.toggle-form {
  text-align: center;
  margin-top: 15px;
  font-size: 14px;
  color: #666;
}

.toggle-form a {
  color: #667eea;
  text-decoration: none;
  font-weight: 600;
}

.toggle-form a:hover {
  text-decoration: underline;
}

.message {
  padding: 12px;
  border-radius: 5px;
  margin-bottom: 20px;
  font-size: 14px;
  text-align: center;
  display: none;
}

.message.show {
  display: block;
}

.message.success {
  background: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.message.error {
  background: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}

/* Responsive */
@media (max-width: 480px) {
  .login-box {
    padding: 30px 20px;
  }

  h1 {
    font-size: 28px;
  }

  h2 {
    font-size: 20px;
  }
}