/* Africa Center - Main Stylesheet
   Optimized for performance and accessibility
   Version 2.0 - February 2026 */

:root {
  /* Color System */
  --primary: #2E7D32;
  --primary-dark: #1B5E20;
  --primary-light: #4CAF50;
  --secondary: #FFA000;
  --secondary-dark: #FF6F00;
  --secondary-light: #FFD54F;

  /* Neutrals */
  --text-primary: #212121;
  --text-secondary: #757575;
  --text-disabled: #BDBDBD;
  --bg-primary: #FFFFFF;
  --bg-secondary: #F5F5F5;
  --bg-tertiary: #FAFAFA;
  --border: #E0E0E0;

  /* Semantic Colors */
  --success: #4CAF50;
  --warning: #FF9800;
  --error: #F44336;
  --info: #2196F3;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Layout */
  --max-width: 1280px;
  --header-height: 64px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 20px rgba(0,0,0,0.15);
  --shadow-xl: 0 20px 40px rgba(0,0,0,0.2);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 600;
  margin-bottom: var(--space-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1.125rem; }

p {
  margin-bottom: var(--space-md);
}

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

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

/* Utility Classes */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--text-secondary); }

/* Header & Navigation */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  height: var(--header-height);
  transition: all var(--transition-normal);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.nav-logo .icon {
  width: 32px;
  height: 32px;
  background: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1rem;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--space-xl);
}

.nav-menu a {
  color: var(--text-primary);
  font-weight: 500;
  position: relative;
  padding: var(--space-xs) 0;
}

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

.nav-menu a:hover::after,
.nav-menu a.active::after {
  width: 100%;
}

.nav-search {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* Search Component */
.search-container {
  position: relative;
  width: 100%;
  max-width: 600px;
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-secondary);
  border-radius: 50px;
  padding: var(--space-xs);
  transition: all var(--transition-normal);
  border: 2px solid transparent;
}

.search-box:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(46, 125, 50, 0.1);
}

.search-input {
  flex: 1;
  border: none;
  background: none;
  padding: var(--space-sm) var(--space-md);
  font-size: 1rem;
  outline: none;
}

.search-btn {
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 50px;
  padding: var(--space-sm) var(--space-lg);
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.search-btn:hover {
  background: var(--primary-dark);
}

/* Hero Section */
.hero {
  padding: var(--space-3xl) 0;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  min-height: 500px;
  display: flex;
  align-items: center;
}

.hero-content {
  text-align: center;
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  margin-bottom: var(--space-lg);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-lg);
  margin: var(--space-2xl) 0;
}

.stat-card {
  background: var(--bg-primary);
  border-radius: 12px;
  padding: var(--space-lg);
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  border: 1px solid var(--border);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: var(--space-xs);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Country Grid */
.countries-section {
  padding: var(--space-3xl) 0;
  background: var(--bg-secondary);
}

.countries-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.country-card {
  background: var(--bg-primary);
  border-radius: 12px;
  padding: var(--space-lg);
  text-align: center;
  transition: all var(--transition-normal);
  cursor: pointer;
  border: 1px solid var(--border);
}

.country-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.country-flag {
  font-size: 3rem;
  margin-bottom: var(--space-md);
}

.country-name {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

.country-info {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Map Container */
.map-section {
  padding: var(--space-3xl) 0;
}

.map-container {
  height: 500px;
  background: var(--bg-secondary);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

#africa-map {
  width: 100%;
  height: 100%;
}

/* Charts */
.chart-container {
  background: var(--bg-primary);
  border-radius: 12px;
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--space-xl);
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-lg);
}

.chart-title {
  font-size: 1.5rem;
  font-weight: 600;
}

.chart-actions {
  display: flex;
  gap: var(--space-sm);
}

.chart-btn {
  padding: var(--space-xs) var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.chart-btn:hover,
.chart-btn.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* Data Tables */
.data-table {
  width: 100%;
  background: var(--bg-primary);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.data-table thead {
  background: var(--bg-secondary);
}

.data-table th {
  padding: var(--space-md);
  text-align: left;
  font-weight: 600;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.data-table td {
  padding: var(--space-md);
  border-top: 1px solid var(--border);
}

.data-table tbody tr:hover {
  background: var(--bg-tertiary);
}

/* Footer */
.footer {
  background: var(--text-primary);
  color: white;
  padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer-brand {
  max-width: 300px;
}

.footer-brand .logo {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.875rem;
}

.footer-section h4 {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
  color: rgba(255, 255, 255, 0.9);
}

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

.footer-section li {
  margin-bottom: var(--space-sm);
}

.footer-section a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.footer-section a:hover {
  color: white;
}

.footer-bottom {
  padding-top: var(--space-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.5);
}

/* Loading States */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-secondary) 25%,
    var(--bg-tertiary) 50%,
    var(--bg-secondary) 75%
  );
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
}

@keyframes loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn var(--transition-normal) ease-in;
}

.slide-in-up {
  animation: slideInUp var(--transition-normal) ease-out;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .footer-content {
    grid-template-columns: 1fr 1fr;
  }

  .countries-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }

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

  .nav-menu {
    display: none;
  }

  .mobile-menu-toggle {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: var(--space-sm);
    background: none;
    border: none;
    cursor: pointer;
  }

  .mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-fast);
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .countries-grid {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .chart-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-md);
  }

  .hero {
    padding: var(--space-2xl) 0;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .countries-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Print Styles */
@media print {
  .header,
  .footer,
  .search-container,
  .nav-menu {
    display: none;
  }

  body {
    font-size: 12pt;
    line-height: 1.5;
  }

  a {
    color: inherit;
    text-decoration: none;
  }

  .container {
    max-width: 100%;
    padding: 0;
  }
}

/* Accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--primary);
  color: white;
  padding: var(--space-sm) var(--space-md);
  text-decoration: none;
  z-index: 200;
}

.skip-link:focus {
  top: 0;
}

/* Focus Styles */
:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

button:focus,
a:focus {
  outline-offset: 4px;
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
  :root {
    --primary: #005A00;
    --text-primary: #000000;
    --bg-primary: #FFFFFF;
    --border: #000000;
  }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
  :root {
    --text-primary: #F5F5F5;
    --text-secondary: #B0B0B0;
    --bg-primary: #121212;
    --bg-secondary: #1E1E1E;
    --bg-tertiary: #2A2A2A;
    --border: #3A3A3A;
  }

  .header {
    background: var(--bg-primary);
  }

  .stat-card,
  .country-card,
  .chart-container,
  .data-table {
    background: var(--bg-secondary);
  }
}