:root {
  --primary-white: #ffffff;
  --off-white: #fafafa;
  --light-gray: #f0f0f0;
  --medium-gray: #666666;
  --dark-gray: #333333;
  --black: #000000;
  
  --iridescent-1: rgba(255, 182, 193, 0.3);
  --iridescent-2: rgba(176, 224, 230, 0.3);
  --iridescent-3: rgba(221, 160, 221, 0.3);
  --iridescent-4: rgba(152, 251, 152, 0.3);
  --iridescent-5: rgba(255, 218, 185, 0.3);
  
  --font-sans: 'Source Sans Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Source Serif Pro', Georgia, serif;
  --font-mono: 'Source Code Pro', 'Monaco', 'Cascadia Code', 'Roboto Mono', monospace;
  
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 8px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 16px rgba(0,0,0,0.1);
  
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-pill: 100px;
}

[data-theme="dark"] {
  --primary-white: #1a1a1a;
  --off-white: #222222;
  --light-gray: #2a2a2a;
  --medium-gray: #b0b0b0;
  --dark-gray: #e0e0e0;
  --black: #ffffff;
  --accent-color: #2d5016;
  
  --iridescent-1: rgba(255, 182, 193, 0.4);
  --iridescent-2: rgba(176, 224, 230, 0.4);
  --iridescent-3: rgba(221, 160, 221, 0.4);
  --iridescent-4: rgba(152, 251, 152, 0.4);
  --iridescent-5: rgba(255, 218, 185, 0.4);
  
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 8px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 16px rgba(0,0,0,0.5);
}

:root {
  --accent-color: #f8f9fa;
  --forest-green: #2d5016;
  --forest-green-light: #4a7d29;
}

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--dark-gray);
  background: var(--primary-white);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.main-content {
  flex: 1;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 500;
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
  margin-bottom: 1rem;
}

a {
  color: var(--dark-gray);
  text-decoration: none;
  transition: all 0.3s ease;
}

.btn-primary, .btn-secondary {
  display: inline-block;
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  font-weight: 500;
  transition: all 0.3s ease;
  text-align: center;
  cursor: pointer;
  border: 2px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--forest-green), var(--forest-green-light));
  color: white;
  border-color: var(--forest-green);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--forest-green-light), var(--forest-green));
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(45, 80, 22, 0.3);
}

.btn-secondary {
  background: var(--primary-white);
  color: var(--dark-gray);
  border-color: var(--light-gray);
}

.btn-secondary:hover {
  background: var(--off-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.site-header {
  background: var(--primary-white);
  border-bottom: 1px solid var(--light-gray);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-weight: 600;
}

.logo-text {
  font-size: 1.5rem;
  background: linear-gradient(90deg, var(--dark-gray), var(--medium-gray));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-subtitle {
  font-size: 1rem;
  color: var(--medium-gray);
  font-weight: 300;
}

.main-nav {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-link {
  position: relative;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  transition: all 0.3s ease;
}

.nav-link:hover {
  background: linear-gradient(135deg, var(--iridescent-1), var(--iridescent-2));
}

.nav-link.active {
  background: linear-gradient(135deg, var(--forest-green), var(--forest-green-light));
  color: white;
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.mobile-menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--dark-gray);
  transition: all 0.3s ease;
}

.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: 1rem;
}

.theme-toggle:hover {
  background: linear-gradient(135deg, var(--iridescent-1), var(--iridescent-2));
}

.theme-icon {
  font-size: 1.2rem;
  transition: transform 0.3s ease;
}

.theme-text {
  font-family: 'Times New Roman', 'Computer Modern', serif;
  font-style: italic;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.5px;
}

.theme-toggle:hover .theme-icon {
  transform: rotate(180deg);
}

.site-footer {
  background: var(--off-white);
  border-top: 1px solid var(--light-gray);
  margin-top: 4rem;
  padding: 3rem 0 1rem;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
  margin-bottom: 1rem;
  font-weight: 500;
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: 0.5rem;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--light-gray);
  color: var(--medium-gray);
  font-size: 0.875rem;
}

.hidden {
  display: none !important;
}

@media (max-width: 768px) {
  .main-nav {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: flex;
  }
  
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (max-width: 480px) {
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.25rem; }
  
  .container {
    padding: 0 15px;
  }
}