/* ============================================
   RESPONSIVE DESIGN
   Mobile-first responsive styles
   ============================================ */

/* ============================================
   SMALL DEVICES (Mobile)
   ============================================ */

@media (max-width: 768px) {
  /* ROOT ADJUSTMENTS */
  :root {
    --font-size-5xl: 2rem;
    --font-size-4xl: 1.75rem;
    --font-size-3xl: 1.5rem;
    --spacing-4xl: 3rem;
    --spacing-3xl: 2rem;
  }

  /* CONTAINER */
  .container,
  .container-sm {
    padding: 0 var(--spacing-lg);
  }

  /* HEADER & NAVIGATION */
  .header-container {
    padding: var(--spacing-base) 0;
  }

  .logo {
    font-size: var(--font-size-base);
  }

  .nav-toggle {
    display: block;
  }

  nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border-light);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
  }

  nav.open {
    max-height: 500px;
  }

  nav ul {
    flex-direction: column;
    gap: 0;
    align-items: flex-start;
    padding: var(--spacing-lg);
  }

  nav a {
    display: block;
    padding: var(--spacing-base) 0;
    width: 100%;
  }

  /* SECTION */
  .section {
    padding: var(--spacing-3xl) 0;
  }

  /* HERO */
  .hero {
    padding: var(--spacing-3xl) 0;
  }

  .hero h1 {
    font-size: 2rem;
    margin-bottom: var(--spacing-lg);
  }

  .hero p {
    font-size: var(--font-size-base);
  }

  .hero-actions {
    flex-direction: column;
    gap: var(--spacing-base);
  }

  .hero-actions .btn {
    width: 100%;
  }

  /* FEATURE SECTION */
  .feature-section,
  .feature-section.reverse {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
    direction: ltr;
  }

  .feature-section.reverse > * {
    direction: ltr;
  }

  /* GRIDS */
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  /* FORM ROWS */
  .form-row,
  .form-row-thirds {
    grid-template-columns: 1fr;
  }

  /* FOOTER */
  footer {
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--spacing-base);
    text-align: center;
  }

  /* CTA SECTION */
  .cta-section {
    padding: var(--spacing-2xl);
  }

  /* BUTTONS */
  .btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-sm);
  }

  .btn-lg {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
  }

  /* NEWSLETTER FORM */
  .newsletter-form-inline {
    grid-template-columns: 1fr;
  }

  /* STATS GRID */
  .stats-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

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

  /* TYPOGRAPHY */
  h1 {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-lg);
  }

  h2 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-base);
  }

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

  /* ARTICLE META */
  .article-meta {
    flex-wrap: wrap;
  }

  /* CARDS */
  .card {
    padding: var(--spacing-lg);
  }

  .resource-card {
    padding: var(--spacing-lg);
  }

  /* DIVIDER */
  .divider {
    margin: var(--spacing-lg) 0;
  }
}

/* ============================================
   MEDIUM DEVICES (Tablets)
   ============================================ */

@media (min-width: 769px) and (max-width: 1024px) {
  /* GRIDS */
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  /* FEATURE SECTION */
  .feature-section {
    grid-template-columns: 1fr;
    gap: var(--spacing-3xl);
  }

  /* FOOTER */
  .footer-content {
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-2xl);
  }

  .footer-section:nth-child(3) {
    grid-column: 2 / 3;
    grid-row: 2 / 3;
  }
}

/* ============================================
   LARGE DEVICES (Desktop)
   ============================================ */

@media (min-width: 1025px) {
  /* Smooth scrolling is default in root */
}

/* ============================================
   EXTRA LARGE DEVICES
   ============================================ */

@media (min-width: 1440px) {
  .container {
    max-width: 1400px;
  }
}

/* ============================================
   ORIENTATION ADJUSTMENTS
   ============================================ */

@media (orientation: landscape) and (max-height: 600px) {
  .section {
    padding: var(--spacing-2xl) 0;
  }

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

  h1 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-base);
  }

  .hero p {
    margin-bottom: var(--spacing-lg);
  }
}

/* ============================================
   ACCESSIBILITY - PREFERS REDUCED MOTION
   ============================================ */

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============================================
   ACCESSIBILITY - HIGH CONTRAST
   ============================================ */

@media (prefers-contrast: more) {
  :root {
    --color-text-primary: #000000;
    --color-accent-primary: #0000ee;
    --color-border: #000000;
    --color-border-light: #333333;
  }

  .card,
  .resource-card {
    border-width: 2px;
  }

  .btn {
    border-width: 2px;
  }
}

/* ============================================
   ACCESSIBILITY - DARK MODE
   ============================================ */

@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #0f0f0f;
    --color-surface: #1a1a1a;
    --color-text-primary: #f5f5f5;
    --color-text-secondary: #b3b3b3;
    --color-text-tertiary: #808080;
    --color-border: #333333;
    --color-border-light: #1f1f1f;
    --color-accent-secondary-light: #2a1f40;
  }

  .cta-section {
    background-color: var(--color-accent-secondary-light);
  }
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
  body {
    background-color: white;
    color: black;
  }

  header,
  footer,
  .nav-toggle,
  .newsletter-form,
  .btn {
    display: none;
  }

  .container {
    max-width: 100%;
  }

  a {
    text-decoration: underline;
  }

  a[href]:after {
    content: " (" attr(href) ")";
  }

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

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