/* Base Styles and Variables */
:root {
  /* Colors */
  --color-primary: #1a365d;
  --color-primary-light: #2a4a7f;
  --color-primary-dark: #102a4c;
  --color-secondary: #2c7a7b;
  --color-secondary-light: #38b2b2;
  --color-secondary-dark: #1d5354;
  --color-accent: #ed8936;
  --color-accent-light: #f6ad55;
  --color-accent-dark: #c05621;
  
  --color-success: #38a169;
  --color-warning: #d69e2e;
  --color-error: #e53e3e;
  
  --color-text-primary: #2d3748;
  --color-text-secondary: #4a5568;
  --color-text-tertiary: #718096;
  --color-text-light: #f7fafc;
  
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f7fafc;
  --color-bg-tertiary: #e2e8f0;
  
  --color-border: #e2e8f0;
  
  /* Typography */
  --font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-size-base: 1rem;
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  
  /* Spacing */
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  --spacing-12: 3rem;
  --spacing-16: 4rem;
  
  /* Borders */
  --border-radius-sm: 0.125rem;
  --border-radius: 0.25rem;
  --border-radius-md: 0.375rem;
  --border-radius-lg: 0.5rem;
  --border-radius-xl: 1rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  
  /* Transitions */
  --transition-normal: all 0.3s ease;
  --transition-fast: all 0.15s ease;
}

/* Reset and Base Styles */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.5;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
}

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

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

ul, ol {
  list-style-position: inside;
}

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

button {
  cursor: pointer;
  font-family: inherit;
}

/* Layout */
.page-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-4);
}

main {
  flex: 1;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin-bottom: var(--spacing-4);
  font-weight: 700;
  line-height: 1.2;
}

h1 {
  font-size: var(--font-size-4xl);
}

h2 {
  font-size: var(--font-size-3xl);
}

h3 {
  font-size: var(--font-size-2xl);
}

h4 {
  font-size: var(--font-size-xl);
}

h5 {
  font-size: var(--font-size-lg);
}

h6 {
  font-size: var(--font-size-base);
}

p {
  margin-bottom: var(--spacing-4);
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-8);
  color: var(--color-primary);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--spacing-2) var(--spacing-4);
  border-radius: var(--border-radius);
  font-weight: 600;
  text-align: center;
  transition: var(--transition-normal);
  border: none;
  cursor: pointer;
}

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

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

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

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

.btn-sm {
  padding: var(--spacing-1) var(--spacing-3);
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--font-size-lg);
}

/* Header */
.site-header {
  background-color: transparent;
  position: fixed;
  width: 100%;
  top: 0;
  left: 0;
  z-index: 100;
  transition: var(--transition-normal);
  padding: var(--spacing-4) 0;
}

.site-header.scrolled {
  background-color: var(--color-bg-primary);
  box-shadow: var(--shadow);
  padding: var(--spacing-2) 0;
}

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

.site-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
}

.site-title:hover {
  color: var(--color-primary-light);
}

.mobile-menu-toggle {
  display: none;
  background: transparent;
  border: none;
  width: 30px;
  height: 24px;
  position: relative;
  z-index: 101;
}

.bar {
  display: block;
  width: 100%;
  height: 3px;
  background-color: var(--color-primary);
  margin: 5px 0;
  transition: var(--transition-normal);
  border-radius: var(--border-radius-sm);
}

.main-nav ul {
  display: flex;
  gap: var(--spacing-6);
  list-style: none;
}

.main-nav a {
  color: var(--color-text-primary);
  font-weight: 500;
  position: relative;
}

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

.main-nav a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -4px;
  left: 0;
  background-color: var(--color-primary);
  transition: var(--transition-normal);
}

.main-nav a:hover::after {
  width: 100%;
}

/* Footer */
.site-footer {
  background-color: var(--color-primary-dark);
  color: var(--color-text-light);
  padding: var(--spacing-12) 0 var(--spacing-4);
  margin-top: var(--spacing-16);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-8);
  margin-bottom: var(--spacing-8);
}

.footer-column h3 {
  color: white;
  margin-bottom: var(--spacing-4);
  font-size: var(--font-size-lg);
}

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

.footer-column li {
  margin-bottom: var(--spacing-2);
}

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

.footer-column a:hover {
  opacity: 1;
  color: white;
}

.social-links {
  display: flex;
  gap: var(--spacing-3);
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.1);
  transition: var(--transition-normal);
}

.social-links a:hover {
  background-color: var(--color-secondary);
  transform: translateY(-3px);
}

.social-links svg {
  color: white;
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-6);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: var(--font-size-sm);
  opacity: 0.7;
}

/* Media Queries */
@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: block;
  }
  
  .main-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 70%;
    height: 100vh;
    background-color: var(--color-bg-primary);
    box-shadow: var(--shadow-lg);
    transition: var(--transition-normal);
    padding: 80px var(--spacing-6) var(--spacing-6);
    z-index: 100;
  }
  
  .main-nav.active {
    right: 0;
  }
  
  .main-nav ul {
    flex-direction: column;
    gap: var(--spacing-4);
  }
  
  .main-nav a {
    display: block;
    font-size: var(--font-size-lg);
  }
  
  body.menu-open {
    overflow: hidden;
  }
  
  .mobile-menu-toggle.active .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  
  .mobile-menu-toggle.active .bar:nth-child(2) {
    opacity: 0;
  }
  
  .mobile-menu-toggle.active .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-4xl: 1.875rem;
    --font-size-3xl: 1.5rem;
  }
  
  .container {
    padding: 0 var(--spacing-3);
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-6);
  }
}