:root {
  --primary: #2c3e50;
  --secondary: #3498db;
  --background: #f8f9fa;
  --footer-bg: #2c3e50;
  --button: #3498db;
  --section-bg-1: #ecf0f1;
  --section-bg-2: #dfe6e9;
  --section-bg-3: #bdc3c7;
  --text-primary: #2c3e50;
  --text-secondary: #7f8c8d;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

body {
  background-color: var(--background);
  color: var(--text-primary);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.7;
  margin: 0;
  padding: 0;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--primary);
  font-weight: 600;
  letter-spacing: -0.025em;
  margin-top: 0;
  margin-bottom: 1rem;
}

h1 {
  font-size: 2.5rem;
  line-height: 1.2;
}

h2 {
  font-size: 2rem;
  line-height: 1.25;
}

p {
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  max-width: 65ch;
}

a {
  color: var(--secondary);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--primary);
  text-decoration: underline;
}

/* Sections */
.section {
  padding: 5rem 0;
}

.section-bg-1 {
  background-color: var(--section-bg-1);
}

.section-bg-2 {
  background-color: var(--section-bg-2);
}

.section-bg-3 {
  background-color: var(--section-bg-3);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 0.375rem;
  font-weight: 500;
  text-align: center;
  transition: var(--transition);
  cursor: pointer;
}

.btn-primary {
  background-color: var(--button);
  color: white;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: #2980b9;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  border: 2px solid var(--button);
  color: var(--button);
  background-color: transparent;
}

.btn-outline:hover {
  background-color: var(--button);
  color: white;
}

/* Cards */
.card {
  background-color: white;
  border-radius: 0.5rem;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.card-img {
  width: 100%;
  height: auto;
}

.card-body {
  padding: 1.5rem;
}

/* Navigation */
.navbar {
  background-color: white;
  box-shadow: var(--shadow-sm);
  padding: 1rem 0;
}

.nav-link {
  color: var(--text-primary);
  padding: 0.5rem 1rem;
  border-radius: 0.25rem;
}

.nav-link:hover {
  background-color: var(--section-bg-1);
  color: var(--secondary);
  text-decoration: none;
}

/* Footer */
.footer {
  background-color: var(--footer-bg);
  color: white;
  padding: 3rem 0;
}

.footer a {
  color: rgba(255, 255, 255, 0.8);
}

.footer a:hover {
  color: white;
  text-decoration: none;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-fadeIn {
  animation: fadeIn 0.6s ease-out forwards;
}

/* Responsive */
@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  .section {
    padding: 3rem 0;
  }
}