/* Global Route: Responsive Design */
/* Mobile-first, progressive enhancement */

/* ===== TABLET (768px and up) ===== */
@media (min-width: 768px) {
  h1 {
    font-size: var(--font-size-3xl);
  }

  h2 {
    font-size: var(--font-size-2xl);
  }

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

  .header-container {
    padding: var(--spacing-lg) var(--spacing-md);
  }

  /* Navigation: Show horizontal menu */
  .nav-toggle {
    display: none;
  }

  .nav-menu {
    position: static;
    display: flex;
    flex-direction: row;
    gap: var(--spacing-lg);
    box-shadow: none;
    padding: 0;
    background-color: transparent;
  }

  .nav-menu.active {
    display: flex;
  }

  /* Hero */
  .hero {
    padding: var(--spacing-3xl) var(--spacing-lg);
  }

  .hero-stats {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
  }

  /* Sections */
  .problem,
  .approach,
  .featured,
  .tools,
  .newsletter,
  .testimonials,
  .cta-final {
    padding: var(--spacing-3xl) var(--spacing-lg);
  }

  /* Grids */
  .problem-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

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

  /* Footer */
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Newsletter Form */
  .newsletter-form {
    flex-wrap: nowrap;
  }

  .newsletter-form input {
    flex: 1;
    min-width: auto;
  }

  /* Buttons */
  .btn {
    padding: var(--spacing-md) var(--spacing-lg);
  }

  .btn-large {
    padding: var(--spacing-lg) var(--spacing-2xl);
  }

  .hero-cta {
    gap: var(--spacing-lg);
  }

  /* Ad sidebar */
  .article-sidebar {
    display: block;
  }

  #mobile-footer {
    display: none !important;
  }
}

/* ===== DESKTOP (1024px and up) ===== */
@media (min-width: 1024px) {
  h1 {
    font-size: var(--font-size-4xl);
  }

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

  /* Hero */
  .hero {
    padding: var(--spacing-3xl) var(--spacing-lg);
    display: flex;
    gap: var(--spacing-3xl);
    align-items: center;
  }

  .hero-content {
    flex: 1;
    text-align: left;
  }

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

  .hero-cta {
    justify-content: flex-start;
  }

  /* Grids */
  .problem-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .approach-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .featured-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .tools-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .testimonials-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  /* Footer */
  .footer-content {
    grid-template-columns: repeat(4, 1fr);
  }

  .footer-links {
    gap: var(--spacing-2xl);
  }

  /* Article layout with sidebar */
  .article-container {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: var(--spacing-lg);
  }

  .article-sidebar {
    position: sticky;
    top: 80px;
    height: fit-content;
  }

  /* Sticky header ad */
  #sticky-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed);
  }

  /* Mobile footer hidden */
  #mobile-footer {
    display: none !important;
  }
}

/* ===== LARGE DESKTOP (1280px and up) ===== */
@media (min-width: 1280px) {
  .container {
    max-width: 1280px;
  }

  /* Extra spacing on larger screens */
  .problem,
  .approach,
  .featured,
  .tools,
  .newsletter,
  .testimonials,
  .cta-final {
    padding: var(--spacing-3xl) var(--spacing-2xl);
  }

  /* Cards with more breathing room */
  .problem-card,
  .approach-card,
  .featured-card,
  .tool-card {
    padding: var(--spacing-2xl);
  }
}

/* ===== HIGH DPI / RETINA DISPLAYS ===== */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  /* Thinner borders/shadows for better appearance on retina */
  .btn {
    box-shadow: 0 0.5px 1px rgba(0, 0, 0, 0.05);
  }

  .card {
    box-shadow: 0 2px 3px rgba(0, 0, 0, 0.05);
  }
}

/* ===== LANDSCAPE ORIENTATION ===== */
@media (max-height: 500px) and (orientation: landscape) {
  .hero {
    padding: var(--spacing-lg) var(--spacing-md);
    min-height: auto;
  }

  .hero-stats {
    gap: var(--spacing-sm);
  }

  .stat {
    padding: var(--spacing-md);
  }

  .stat-number {
    font-size: var(--font-size-2xl);
  }
}

/* ===== SMALL DEVICES (320px - 480px) ===== */
@media (max-width: 480px) {
  html {
    font-size: 14px;
  }

  h1 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
  }

  h2 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
  }

  .container {
    padding: 0 var(--spacing-md);
  }

  /* Header on small screens */
  .header-container {
    padding: var(--spacing-md);
    gap: var(--spacing-md);
  }

  .logo-link {
    gap: var(--spacing-sm);
    font-size: var(--font-size-base);
  }

  /* Hero on small screens */
  .hero {
    padding: var(--spacing-2xl) var(--spacing-md);
  }

  .hero-cta {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .btn {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
  }

  /* Single column grids */
  .problem-grid,
  .approach-grid,
  .featured-grid,
  .tools-grid,
  .testimonials-grid {
    grid-template-columns: 1fr;
  }

  /* Smaller sections */
  .problem,
  .approach,
  .featured,
  .tools,
  .newsletter,
  .testimonials,
  .cta-final {
    padding: var(--spacing-2xl) var(--spacing-md);
  }

  .problem-card,
  .approach-card,
  .featured-card,
  .tool-card {
    padding: var(--spacing-md);
  }

  /* Footer on small screens */
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .footer-links {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  /* Newsletter form single column */
  .newsletter-form {
    flex-direction: column;
  }

  .newsletter-form input,
  .newsletter-form button {
    width: 100%;
  }

  /* Ad unit mobile */
  .ad-unit {
    min-height: 250px;
  }

  #mobile-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    z-index: var(--z-fixed);
    box-shadow: var(--shadow-lg);
  }

  /* Add padding to main when footer visible */
  main {
    padding-bottom: 100px;
  }
}

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===== DARK MODE (if implemented) ===== */
@media (prefers-color-scheme: dark) {
  :root {
    --color-neutral-50: #0f172a;
    --color-neutral-100: #1e293b;
    --color-neutral-200: #334155;
    --color-neutral-700: #cbd5e1;
    --color-neutral-800: #e2e8f0;
    --color-neutral-900: #f1f5f9;
  }

  body {
    background-color: var(--color-neutral-50);
    color: var(--color-neutral-800);
  }

  .header,
  .problem-card,
  .featured-card,
  .tool-card {
    background-color: var(--color-neutral-100);
  }
}

/* ===== PRINT ===== */
@media print {
  body {
    background-color: white;
    color: black;
  }

  .header,
  .footer,
  .ad-unit,
  .newsletter,
  .nav-toggle {
    display: none;
  }

  main {
    padding-bottom: 0;
  }

  a {
    text-decoration: underline;
  }

  a::after {
    content: " (" attr(href) ")";
    font-size: 0.75rem;
  }

  h1, h2, h3 {
    page-break-after: avoid;
  }

  p {
    orphans: 3;
    widows: 3;
  }
}

/* ===== TOUCH DEVICES ===== */
@media (hover: none) and (pointer: coarse) {
  .btn {
    min-height: 44px;
    min-width: 44px;
  }

  a, button {
    padding: var(--spacing-sm);
  }

  /* Larger touch targets */
  .nav-menu a {
    padding: var(--spacing-md);
    display: block;
  }

  .footer-section a {
    padding: var(--spacing-sm) 0;
    display: block;
  }
}


/* ============================================================
   UI-2: Responsive breakpoints for page-specific layouts
   ============================================================ */

/* ===== TABLET (768px and up) ===== */
@media (min-width: 768px) {

  /* Playbook */
  .playbook-cards {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .playbook-section {
    padding: var(--spacing-3xl) var(--spacing-lg);
  }

  /* FAQ */
  .faq-section {
    padding: var(--spacing-3xl) var(--spacing-lg);
  }

  /* About / Contact */
  .about-section,
  .contact-section {
    padding: var(--spacing-3xl) var(--spacing-lg);
  }

  /* Route results */
  .route-results article {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--spacing-md);
    align-items: start;
  }

  .route-results article a {
    white-space: nowrap;
  }

  /* CTA buttons */
  .cta-buttons {
    justify-content: center;
    gap: var(--spacing-lg);
  }

  /* Filter controls horizontal */
  .filter-controls {
    flex-direction: row;
    align-items: flex-end;
    flex-wrap: wrap;
  }

  .filter-group {
    flex: 1;
    min-width: 180px;
  }

  .search-box {
    flex: 2;
    min-width: 220px;
  }

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

  /* Tables */
  table {
    font-size: var(--font-size-base);
  }
}

/* ===== DESKTOP (1024px and up) ===== */
@media (min-width: 1024px) {

  /* Playbook */
  .playbook-cards {
    grid-template-columns: repeat(3, 1fr);
  }

  .budget-sections {
    grid-template-columns: repeat(4, 1fr);
  }

  /* Route results — wider cards */
  .route-results {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  /* Calculator side-by-side */
  .calculator-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: start;
  }

  /* Countries grid */
  .countries-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  /* Filter controls */
  .filter-controls {
    flex-wrap: nowrap;
  }

  /* CTA buttons left-align on playbook pages */
  [data-page-type="student-playbook"] .cta-buttons,
  [data-page-type="professional-playbook"] .cta-buttons,
  [data-page-type="business-playbook"] .cta-buttons {
    justify-content: flex-start;
  }
}

/* ===== SMALL DEVICES (max 480px) ===== */
@media (max-width: 480px) {

  /* Playbook */
  .playbook-card {
    padding: var(--spacing-md);
  }

  .budget-sections section {
    padding: var(--spacing-md);
  }

  /* FAQ */
  summary {
    padding: var(--spacing-md);
    font-size: var(--font-size-sm);
  }

  details > p,
  details > ul,
  details > ol {
    padding: 0 var(--spacing-md) var(--spacing-md);
  }

  /* Tables — horizontal scroll on mobile */
  .comparison-table,
  .table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  table {
    min-width: 480px;
  }

  /* CTA buttons stack on mobile */
  .cta-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .cta-buttons .btn {
    text-align: center;
  }

  /* Route results */
  .route-results article {
    padding: var(--spacing-md);
  }
}