:root {
  --primary-color: #dc3545;
  --primary-dark: #c82333;
  --secondary-color: #6c757d;
  --text-dark: #212529;
  --text-light: #6c757d;
  --bg-light: #f8f9fa;
  --white: #ffffff;
  --border-color: #dee2e6;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text-dark);
  line-height: 1.6;
  padding-top: 76px;
}

.navbar {
  transition: all 0.3s ease;
}

.navbar-brand {
  font-size: 1.5rem;
  color: var(--primary-color) !important;
}

.nav-link {
  color: var(--text-dark) !important;
  font-weight: 500;
  padding: 0.5rem 1rem !important;
  transition: color 0.3s ease;
}

.nav-link:hover {
  color: var(--primary-color) !important;
}

.nav-link.active {
  color: var(--primary-color) !important;
}

.btn-primary {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  transition: all 0.3s ease;
}

.btn-primary:hover {
  background-color: var(--primary-dark);
  border-color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(220, 53, 69, 0.3);
}

.btn-outline-primary {
  color: var(--primary-color);
  border-color: var(--primary-color);
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  transition: all 0.3s ease;
}

.btn-outline-primary:hover {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  transform: translateY(-2px);
}

.hero-section {
  padding: 100px 0 80px;
  background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
}

.hero-section h1 {
  color: var(--text-dark);
  margin-bottom: 1.5rem;
}

.hero-section .lead {
  color: var(--text-light);
  font-size: 1.25rem;
}

.page-header {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  padding: 120px 0 80px;
  margin-bottom: 0;
}

.section {
  padding: 80px 0;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 1rem;
}

.service-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.service-icon-large {
  font-size: 4rem;
}

.step-number {
  width: 60px;
  height: 60px;
  background-color: var(--primary-color);
  color: var(--white);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 auto;
}

.cta-section {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  padding: 80px 0;
}

.footer {
  padding-top: 60px;
  padding-bottom: 20px;
}

.footer a {
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer a:hover {
  color: var(--white) !important;
}

.card {
  transition: all 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.shadow-sm {
  box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
}

.shadow {
  box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}

#bmiResult {
  padding: 1.5rem;
  border-radius: 0.5rem;
  text-align: center;
  font-weight: 600;
}

.bmi-normal {
  background-color: #d4edda;
  color: #155724;
  border: 2px solid #c3e6cb;
}

.bmi-underweight {
  background-color: #fff3cd;
  color: #856404;
  border: 2px solid #ffeeba;
}

.bmi-overweight {
  background-color: #fff3cd;
  color: #856404;
  border: 2px solid #ffeeba;
}

.bmi-obese {
  background-color: #f8d7da;
  color: #721c24;
  border: 2px solid #f5c6cb;
}

.thank-you-section {
  padding: 120px 0;
  background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
}

.thank-you-icon {
  width: 100px;
  height: 100px;
  background-color: #28a745;
  color: var(--white);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  margin: 0 auto;
}

@media (max-width: 768px) {
  body {
    padding-top: 66px;
  }

  .hero-section {
    padding: 60px 0 40px;
  }

  .section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 2rem;
  }

  .page-header {
    padding: 100px 0 60px;
  }

  .btn-lg {
    padding: 0.5rem 1rem;
    font-size: 1rem;
  }
}

@media (max-width: 576px) {
  .hero-section h1 {
    font-size: 2rem;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .display-4 {
    font-size: 2.5rem;
  }
}