:root {
  --primary-color: #7c3aed;
  --primary-dark: #6d28d9;
  --secondary-color: #a78bfa;
  --text-dark: #1f2937;
  --text-light: #6b7280;
  --bg-light: #f9fafb;
  --white: #ffffff;
}

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text-dark);
  line-height: 1.6;
}

.brand-name {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
}

.navbar {
  padding: 1rem 0;
}

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

.navbar-light .navbar-nav .nav-link:hover,
.navbar-light .navbar-nav .nav-link.active {
  color: var(--primary-color);
}

.hero-section {
  padding: 5rem 0;
  background: linear-gradient(135deg, #f9fafb 0%, #e0e7ff 100%);
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 1.5rem;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-light);
  margin-bottom: 2rem;
}

.btn-primary {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  padding: 0.75rem 2rem;
  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 12px rgba(124, 58, 237, 0.3);
}

.btn-outline-primary {
  color: var(--primary-color);
  border-color: var(--primary-color);
  padding: 0.75rem 2rem;
  font-weight: 600;
  transition: all 0.3s ease;
}

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

.card {
  border: none;
  border-radius: 12px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.page-header {
  padding: 3rem 0;
}

.page-header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-dark);
}

.feature-list {
  list-style: none;
  padding: 0;
}

.feature-list li {
  padding: 0.5rem 0;
  padding-left: 1.5rem;
  position: relative;
}

.feature-list li:before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--primary-color);
  font-weight: bold;
}

.footer {
  margin-top: 4rem;
}

.footer h5 {
  font-weight: 700;
  margin-bottom: 1rem;
}

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

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

.bmi-calculator-section {
  background-color: var(--bg-light);
}

.form-control:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 0.2rem rgba(124, 58, 237, 0.25);
}

.form-check-input:checked {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
}

.shadow-sm {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08) !important;
}

.shadow {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1) !important;
}

.shadow-lg {
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15) !important;
}

.text-muted {
  color: var(--text-light) !important;
}

.bg-light {
  background-color: var(--bg-light) !important;
}

.rounded {
  border-radius: 12px !important;
}

img {
  max-width: 100%;
  height: auto;
}

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

.cta-section h2 {
  color: var(--white);
}

.cta-section .lead {
  color: rgba(255, 255, 255, 0.9);
}

.cta-section .btn-primary {
  background-color: var(--white);
  color: var(--primary-color);
  border-color: var(--white);
}

.cta-section .btn-primary:hover {
  background-color: rgba(255, 255, 255, 0.9);
  color: var(--primary-dark);
}

.alert {
  border-radius: 8px;
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

  .page-header h1 {
    font-size: 2rem;
  }
}