:root {
  --primary-color: #667eea;
  --secondary-color: #764ba2;
  --success-color: #10b981;
  --danger-color: #ef4444;
  --warning-color: #f59e0b;
  --dark-color: #1f2937;
  --light-color: #f8fafc;
}

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

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-container {
  width: 100%;
  max-width: 400px;
  padding: 20px;
}

.login-card {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-radius: 20px;
  padding: 40px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.login-header {
  text-align: center;
  margin-bottom: 30px;
}

.login-icon {
  font-size: 3rem;
  color: var(--primary-color);
  margin-bottom: 15px;
}

.login-header h2 {
  color: var(--dark-color);
  font-weight: 700;
  margin-bottom: 5px;
}

.login-header p {
  color: #6b7280;
  font-size: 0.9rem;
}

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

.input-group-text {
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: 10px 0 0 10px;
}

.form-control {
  border: 2px solid #e5e7eb;
  border-radius: 0 10px 10px 0;
  padding: 12px 15px;
  font-size: 1rem;
  transition: all 0.3s ease;
}

.form-control:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

.login-btn {
  width: 100%;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  border: none;
  border-radius: 10px;
  padding: 12px;
  font-size: 1.1rem;
  font-weight: 600;
  transition: all 0.3s ease;
}

.login-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

.login-footer {
  text-align: center;
  margin-top: 30px;
  color: #6b7280;
  font-size: 0.8rem;
}

.alert {
  border-radius: 10px;
  margin-bottom: 20px;
}

@media (max-width: 480px) {
  .login-card {
    padding: 30px 20px;
  }
}