:root {
  --primary-color: #2c3e50;
  --secondary-color: #3498db;
  --accent-color: #e74c3c;
  --background-color: #ecf0f1;
  --text-color: #2c3e50;
  --input-background: #fff;
  --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--background-color);
  margin: 0;
  padding: 0;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-container {
  width: 100%;
  max-width: 400px;
  padding: 2rem;
  background: var(--input-background);
  border-radius: 8px;
  box-shadow: var(--box-shadow);
}

.login-header {
  text-align: center;
  margin-bottom: 2rem;
}

.login-header h1 {
  color: var(--primary-color);
  font-size: 2rem;
  margin: 0;
  padding: 0;
}

.login-header .company-logo {
  width: 120px;
  height: auto;
  margin: 1rem 0;
}

.login-header p {
  color: var(--text-color);
  opacity: 0.8;
  margin: 0.5rem 0;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-group {
  position: relative;
}

.form-group i {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--primary-color);
  opacity: 0.5;
}

.form-control {
  width: 100%;
  padding: 0.8rem 1rem 0.8rem 2.5rem;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 4px;
  font-size: 1rem;
  transition: all 0.3s ease;
  box-sizing: border-box;
}

.form-control:focus {
  border-color: var(--secondary-color);
  outline: none;
  box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

select.form-control {
  appearance: none;
  background-image: url('data:image/svg+xml;utf8,<svg fill="black" height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg"><path d="M7 10l5 5 5-5z"/></svg>');
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

.login-button {
  background: var(--secondary-color);
  color: white;
  border: none;
  padding: 1rem;
  border-radius: 4px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.login-button:hover {
  background: #2980b9;
}

.error-message {
  color: var(--accent-color);
  text-align: center;
  margin-top: 1rem;
  font-size: 0.9rem;
}

/* Loading animation */
.loading {
  display: none;
  text-align: center;
  margin-top: 1rem;
}

.loading-spinner {
  border: 3px solid rgba(0, 0, 0, 0.1);
  border-radius: 50%;
  border-top: 3px solid var(--secondary-color);
  width: 24px;
  height: 24px;
  animation: spin 1s linear infinite;
  margin: 0 auto;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Responsive adjustments */
@media (max-width: 480px) {
  .login-container {
    max-width: 100%;
    margin: 1rem;
    padding: 1.5rem;
  }
}

/* Animation for invalid login */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
  20%, 40%, 60%, 80% { transform: translateX(5px); }
}

.shake {
  animation: shake 0.6s cubic-bezier(.36,.07,.19,.97) both;
}