/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&family=Open+Sans:wght@400;600&display=swap');

:root {
  /* Colors */
  --color-bg: #ffffff;
  --color-bg-alt: #f8f9fa;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-accent: #2E8B57; /* Sea Green */
  --color-accent-hover: #246e45;
  --color-border: #e0e0e0;
  
  /* Typography */
  --font-heading: 'Inter', sans-serif;
  --font-body: 'Open Sans', sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 8rem;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
}

/* Reset & Base */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-text);
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
}

h1 { font-size: 3rem; font-weight: 700; }
h2 { font-size: 2.25rem; font-weight: 600; }
h3 { font-size: 1.5rem; font-weight: 600; }

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

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

p {
  margin-bottom: var(--spacing-sm);
}

ul {
  list-style: none;
}

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

/* Utility Classes */
.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

.btn {
  display: inline-block;
  padding: 12px 24px;
  background-color: var(--color-accent);
  color: white;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: background-color var(--transition-fast);
}

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

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

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

.section {
  padding: var(--spacing-lg) 0;
}

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

.text-center { text-align: center; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }

/* Layout: Navbar */
.navbar {
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(5px);
  z-index: 1000;
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
}

.nav-links {
  display: flex;
  gap: var(--spacing-md);
}

.nav-links a {
  color: var(--color-text);
  font-weight: 500;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-accent);
}

/* Mobile Menu Toggle (Hidden on Desktop) */
.menu-toggle {
  display: none;
  font-size: 1.5rem;
  cursor: pointer;
}

/* Layout: Footer */
.footer {
  padding: var(--spacing-md) 0;
  text-align: center;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-light);
  font-size: 0.9rem;
}

/* Components: Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
}

.card {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.05);
}

.card-title {
  margin-bottom: var(--spacing-xs);
}

.card-meta {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-sm);
  display: block;
}

.tag {
  display: inline-block;
  padding: 4px 8px;
  background-color: var(--color-bg-alt);
  color: var(--color-text-light);
  font-size: 0.75rem;
  border-radius: var(--radius-sm);
  margin-top: var(--spacing-sm);
}

/* Responsive adjustments */
@media (max-width: 768px) {
  h1 { font-size: 2.5rem; }
  
  /* Mobile Nav */
  .menu-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: white;
    flex-direction: column;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 5px 10px rgba(0,0,0,0.05);
  }
  
  .nav-links.active {
    display: flex;
  }
}