body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: linear-gradient(135deg, #1a3876 0%, #2c5aa0 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.signup-container {
  background: white;
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.1);
  padding: 40px;
  width: 100%;
  max-width: 450px;
  margin: 20px;
}

/* Laptop Responsive (1024px - 1366px) */
/* Acer TravelMate P2 Specific (1366x768) */
@media (max-width: 1366px) and (min-width: 1200px) {
  .signup-container {
    max-width: 380px;
    padding: 30px 28px;
  }
  
  .logo {
    height: 50px;
  }
  
  .brand {
    font-size: 1.5rem;
  }
  
  .signup-title {
    font-size: 1.3rem;
  }
  
  .form-group input {
    padding: 10px 14px;
    font-size: 0.95rem;
  }
  
  .signup-btn {
    padding: 10px;
    font-size: 0.95rem;
  }
}

/* Acer TravelMate P2 Exact Resolution (1366x768) */
@media (max-width: 1366px) and (max-height: 768px) {
  .signup-container {
    max-width: 360px;
    padding: 25px 24px;
  }
  
  .logo {
    height: 45px;
  }
  
  .brand {
    font-size: 1.4rem;
  }
  
  .signup-title {
    font-size: 1.2rem;
  }
  
  .form-group input {
    padding: 9px 12px;
    font-size: 0.9rem;
  }
  
  .signup-btn {
    padding: 9px;
    font-size: 0.9rem;
  }
}

@media (max-width: 1366px) and (min-width: 1024px) {
  .signup-container {
    padding: 36px 32px;
    margin: 18px;
    max-width: 480px;
  }
  
  .logo {
    height: 56px;
  }
  
  .brand {
    font-size: 1.7rem;
  }
  
  .signup-title {
    font-size: 1.4rem;
  }
}

/* Tablet Responsive (768px - 1023px) */
@media (max-width: 1023px) and (min-width: 768px) {
  .signup-container {
    padding: 32px 28px;
    margin: 16px;
    max-width: 460px;
  }
  
  .logo {
    height: 52px;
  }
  
  .brand {
    font-size: 1.6rem;
  }
  
  .signup-title {
    font-size: 1.3rem;
  }
}

/* Mobile Responsive - App-like Design */
@media (max-width: 768px) {
  .signup-container {
    padding: 40px 32px;
    margin: 20px;
    max-width: 90%;
    border-radius: 16px;
  }
  
  .logo {
    height: 64px;
  }
  
  .brand {
    font-size: 1.8rem;
  }
  
  .signup-title {
    font-size: 1.5rem;
    margin-bottom: 32px;
  }
  
  .form-group {
    margin-bottom: 24px;
  }
  
  .form-group input {
    padding: 14px 18px;
    font-size: 1.1rem;
    border-radius: 12px;
  }
  
  .signup-btn {
    padding: 14px;
    font-size: 1.1rem;
    border-radius: 12px;
  }
}

@media (max-width: 480px) {
  .signup-container {
    padding: 36px 28px;
    margin: 16px;
    max-width: 95%;
    border-radius: 14px;
  }
  
  .logo {
    height: 60px;
  }
  
  .brand {
    font-size: 1.7rem;
  }
  
  .signup-title {
    font-size: 1.4rem;
    margin-bottom: 28px;
  }
  
  .form-group {
    margin-bottom: 20px;
  }
  
  .form-group input {
    padding: 12px 16px;
    font-size: 1rem;
    border-radius: 10px;
  }
  
  .signup-btn {
    padding: 12px;
    font-size: 1rem;
    border-radius: 10px;
  }
}

.logo-section {
  text-align: center;
  margin-bottom: 30px;
}

.logo {
  height: 60px;
  margin-bottom: 10px;
}

.brand {
  font-size: 1.8rem;
  font-weight: bold;
  color: #1a3876;
  margin: 0;
}

.signup-title {
  text-align: center;
  color: #1a3876;
  font-size: 1.5rem;
  margin-bottom: 30px;
  font-weight: 600;
}

.form-row {
  display: flex;
  gap: 15px;
  margin-bottom: 20px;
}

.form-group {
  margin-bottom: 20px;
  flex: 1;
}

/* Responsive Form Row */
@media (max-width: 768px) {
  .form-row {
    gap: 12px;
    margin-bottom: 16px;
  }
  
  .form-group {
    margin-bottom: 16px;
  }
}

@media (max-width: 480px) {
  .form-row {
    flex-direction: column;
    gap: 0;
    margin-bottom: 0;
  }
  
  .form-group {
    margin-bottom: 14px;
  }
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  color: #333;
  font-weight: 500;
}

.form-group input {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid #e1e5e9;
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.3s;
  box-sizing: border-box;
}

.form-group input:focus {
  outline: none;
  border-color: #1a3876;
}

.password-requirements {
  font-size: 0.85rem;
  color: #666;
  margin-top: 5px;
}

.signup-btn {
  width: 100%;
  background: #1a3876;
  color: white;
  border: none;
  padding: 12px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.3s;
  margin-bottom: 20px;
}

.signup-btn:hover:not(:disabled) {
  background: #2c5aa0;
}

.signup-btn:disabled {
  opacity: 0.85;
  cursor: not-allowed;
}

.login-link {
  text-align: center;
  color: #666;
}

.login-link a {
  color: #1a3876;
  text-decoration: none;
  font-weight: 500;
}

.login-link a:hover {
  text-decoration: underline;
}

.error-message {
  background: #fee;
  color: #c33;
  padding: 10px;
  border-radius: 6px;
  margin-bottom: 20px;
  text-align: center;
  border: 1px solid #fcc;
}

.success-message {
  background: #efe;
  color: #363;
  padding: 10px;
  border-radius: 6px;
  margin-bottom: 20px;
  text-align: center;
  border: 1px solid #cfc;
}

.back-home {
  text-align: center;
  margin-top: 20px;
}

.back-home a {
  color: #1a3876;
  text-decoration: none;
  font-weight: 500;
}

.back-home a:hover {
  text-decoration: underline;
}