/* Americain.org - Optimized CSS for PageSpeed 100 */
/* Critical CSS is inlined in HTML, this file loads deferred */

:root {
  --primary-blue: #1e3a8a;
  --light-blue: #3b82f6;
  --text-dark: #1f2937;
  --text-gray: #4b5563;
  --bg-light: #f9fafb;
  --border-color: #e5e7eb;
  --white: #ffffff;
  --max-width: 1200px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--primary-blue);
}

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

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

a {
  color: var(--light-blue);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--primary-blue);
  text-decoration: underline;
}

a:focus-visible {
  outline: 2px solid var(--light-blue);
  outline-offset: 2px;
}

/* Layout */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Header & Navigation */
header {
  background-color: var(--white);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) 0;
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: var(--spacing-md);
  padding-right: var(--spacing-md);
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-blue);
  text-decoration: none;
}

.logo:hover {
  text-decoration: none;
  color: var(--light-blue);
}

nav ul {
  list-style: none;
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
}

nav a {
  color: var(--text-dark);
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 0.25rem;
  transition: background-color 0.2s ease;
}

nav a:hover {
  background-color: var(--bg-light);
  text-decoration: none;
}

/* Language Switcher */
.lang-switcher {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 0.25rem;
  background-color: var(--white);
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.2s ease;
}

.lang-switcher:hover {
  background-color: var(--bg-light);
  border-color: var(--light-blue);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--text-dark);
}

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: block;
  }

  nav ul {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--white);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-sm);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  }

  nav ul.active {
    display: flex;
  }

  nav li {
    width: 100%;
  }

  nav a {
    display: block;
    width: 100%;
  }
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--light-blue) 100%);
  color: var(--white);
  padding: var(--spacing-xl) 0;
  text-align: center;
}

.hero h1 {
  color: var(--white);
  margin-bottom: var(--spacing-md);
  font-size: 3rem;
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-lg);
  opacity: 0.95;
}

/* Cards */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

.card {
  background-color: var(--white);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: var(--spacing-lg);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.card h3 {
  margin-bottom: var(--spacing-sm);
}

.card p {
  color: var(--text-gray);
  margin-bottom: var(--spacing-md);
}

.card-link {
  display: inline-block;
  padding: 0.5rem 1.5rem;
  background-color: var(--light-blue);
  color: var(--white);
  border-radius: 0.25rem;
  font-weight: 500;
  transition: background-color 0.2s ease;
}

.card-link:hover {
  background-color: var(--primary-blue);
  text-decoration: none;
}

/* Content Sections */
.content-section {
  padding: var(--spacing-xl) 0;
}

.content-section:nth-child(even) {
  background-color: var(--bg-light);
}

/* Article Styles */
article {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
}

article img {
  max-width: 100%;
  height: auto;
  border-radius: 0.5rem;
  margin: var(--spacing-md) 0;
}

/* Lists */
ul, ol {
  margin-left: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
}

li {
  margin-bottom: 0.5rem;
}

/* Tools */
.tool-container {
  background-color: var(--white);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: var(--spacing-lg);
  margin: var(--spacing-md) 0;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.tool-input {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 0.25rem;
  font-size: 1rem;
  margin-bottom: var(--spacing-sm);
}

.tool-button {
  padding: 0.75rem 1.5rem;
  background-color: var(--light-blue);
  color: var(--white);
  border: none;
  border-radius: 0.25rem;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.tool-button:hover {
  background-color: var(--primary-blue);
}

.tool-result {
  margin-top: var(--spacing-md);
  padding: var(--spacing-md);
  background-color: var(--bg-light);
  border-radius: 0.25rem;
  border-left: 4px solid var(--light-blue);
}

/* Footer */
footer {
  background-color: var(--text-dark);
  color: var(--white);
  padding: var(--spacing-xl) 0 var(--spacing-md);
  margin-top: var(--spacing-xl);
}

footer a {
  color: var(--white);
}

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

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.footer-section h4 {
  color: var(--white);
  margin-bottom: var(--spacing-sm);
}

.footer-section ul {
  list-style: none;
  margin-left: 0;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: var(--spacing-md);
  text-align: center;
  font-size: 0.875rem;
  color: rgba(255,255,255,0.7);
}

/* Breadcrumbs */
.breadcrumbs {
  padding: var(--spacing-sm) 0;
  font-size: 0.875rem;
  color: var(--text-gray);
}

.breadcrumbs a {
  color: var(--text-gray);
}

.breadcrumbs a:hover {
  color: var(--light-blue);
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-md) 0;
}

th, td {
  padding: 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

th {
  background-color: var(--bg-light);
  font-weight: 600;
  color: var(--primary-blue);
}

tr:hover {
  background-color: var(--bg-light);
}

/* Responsive */
@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.75rem; }
  h3 { font-size: 1.25rem; }

  .hero h1 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1rem;
  }

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

/* Performance Optimizations */
img {
  max-width: 100%;
  height: auto;
}

/* Print Styles */
@media print {
  header, footer, nav, .lang-switcher {
    display: none;
  }

  body {
    color: #000;
  }

  a {
    text-decoration: underline;
    color: #000;
  }
}

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

/* Skip to main content link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--primary-blue);
  color: var(--white);
  padding: 0.5rem 1rem;
  text-decoration: none;
  z-index: 100;
}

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