:root {
  --primary-color: #2c3e50;
  --secondary-color: #3498db;
  --background-color: #f5f5f5;
  --footer-bg-color: #2c3e50;
  --button-color: #3498db;
  --section-bg-1: #ecf0f1;
  --section-bg-2: #dfe6e9;
  --section-bg-3: #bdc3c7;
  --text-color: #2c3e50;
  --text-light: #f5f5f5;
  --transition-base: all 0.3s ease;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --radius-base: 8px;
  --radius-lg: 12px;
  --space-unit: 1rem;
}

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

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

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: calc(var(--space-unit) * 1.5);
  color: var(--primary-color);
}

h1 {
  font-size: 2.5rem;
  letter-spacing: -0.5px;
}

h2 {
  font-size: 2rem;
  letter-spacing: -0.25px;
}

p {
  margin-bottom: var(--space-unit);
  max-width: 65ch;
}

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

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

.btn {
  display: inline-block;
  padding: calc(var(--space-unit) * 0.75) calc(var(--space-unit) * 1.5);
  background-color: var(--button-color);
  color: white;
  border-radius: var(--radius-base);
  font-weight: 500;
  transition: var(--transition-base);
  box-shadow: var(--shadow-sm);
  border: none;
  cursor: pointer;
}

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

.section {
  padding: calc(var(--space-unit) * 4) 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);
}

.card {
  background: white;
  border-radius: var(--radius-base);
  box-shadow: var(--shadow-sm);
  padding: calc(var(--space-unit) * 2);
  transition: var(--transition-base);
}

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

footer {
  background-color: var(--footer-bg-color);
  color: var(--text-light);
  padding: calc(var(--space-unit) * 3) 0;
}

footer a {
  color: var(--text-light);
  opacity: 0.8;
}

footer a:hover {
  opacity: 1;
}

@media (max-width: 768px) {
  :root {
    --space-unit: 0.75rem;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  .section {
    padding: calc(var(--space-unit) * 3) 0;
  }
}

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

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