/*
 * Responsive Styles for Mobile and Tablet
 * Mobile-first approach with progressive enhancement
 */

/* ============================================
   Tablet (max-width: 1024px)
   ============================================ */
@media (max-width: 1024px) {
  :root {
    --spacing-xl: 2.5rem;
    --spacing-xxl: 3rem;
  }

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

  .hero-content {
    grid-template-columns: 250px 1fr;
    gap: var(--spacing-lg);
  }

  .hero-image img {
    max-width: 250px;
  }

  .hero-text h1 {
    font-size: 2.3rem;
  }

  .hero-text .subtitle {
    font-size: 1.2rem;
  }

  nav ul {
    gap: var(--spacing-md);
  }

  #running-map {
    height: 500px;
  }
}

/* ============================================
   Mobile Landscape / Small Tablet (max-width: 768px)
   ============================================ */
@media (max-width: 768px) {
  :root {
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 2.5rem;
  }

  html {
    font-size: 15px;
  }

  h1 { font-size: 2rem; }
  h2 { font-size: 1.75rem; }
  h3 { font-size: 1.4rem; }

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

  /* Header */
  header {
    padding: var(--spacing-sm) 0;
  }

  header .container {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .site-title {
    font-size: 1.3rem;
  }

  nav ul {
    flex-direction: column;
    gap: var(--spacing-xs);
    text-align: center;
    width: 100%;
  }

  nav a {
    display: block;
    padding: var(--spacing-xs) var(--spacing-sm);
  }

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

  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--spacing-md);
  }

  .hero-image {
    display: flex;
    justify-content: center;
  }

  .hero-image img {
    max-width: 200px;
  }

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

  .hero-text .subtitle {
    font-size: 1.1rem;
  }

  .contact-links {
    justify-content: center;
  }

  /* Main content */
  main {
    padding: var(--spacing-xl) 0;
  }

  section {
    margin-bottom: var(--spacing-xl);
  }

  .section-title {
    font-size: 1.75rem;
  }

  /* Publications */
  .publication {
    padding: var(--spacing-md);
  }

  .pub-title {
    font-size: 1.1rem;
  }

  .pub-links {
    gap: var(--spacing-xs);
  }

  .pub-links a {
    font-size: 0.85rem;
    padding: 0.3rem 0.8rem;
  }

  /* PDF Viewer */
  .pdf-controls {
    flex-direction: column;
  }

  .pdf-controls .btn {
    width: 100%;
  }

  .pdf-viewer {
    height: 60vh;
    min-height: 400px;
  }

  /* Map */
  #running-map {
    height: 400px;
  }

  .map-controls {
    flex-direction: column;
    align-items: stretch;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
  }

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

  .stat-value {
    font-size: 1.5rem;
  }

  .stat-label {
    font-size: 0.8rem;
  }

  /* Buttons */
  .btn {
    padding: 0.6rem 1.2rem;
    font-size: 0.95rem;
  }
}

/* ============================================
   Mobile Portrait (max-width: 480px)
   ============================================ */
@media (max-width: 480px) {
  :root {
    --spacing-sm: 0.8rem;
    --spacing-md: 1.2rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
  }

  html {
    font-size: 14px;
  }

  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }
  h4 { font-size: 1.1rem; }

  /* Hero */
  .hero {
    padding: var(--spacing-lg) 0;
  }

  .hero-image img {
    max-width: 150px;
  }

  .hero-text h1 {
    font-size: 1.75rem;
  }

  .hero-text .subtitle {
    font-size: 1rem;
  }

  .hero-text .affiliation {
    font-size: 0.9rem;
  }

  .contact-links a {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.9rem;
  }

  /* Navigation */
  nav ul {
    gap: 0;
  }

  nav li {
    width: 100%;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  nav li:last-child {
    border-bottom: none;
  }

  /* Publications */
  .publication {
    padding: var(--spacing-sm);
  }

  .pub-title {
    font-size: 1rem;
  }

  .pub-authors,
  .pub-venue {
    font-size: 0.85rem;
  }

  /* PDF Viewer */
  .pdf-viewer {
    height: 50vh;
    min-height: 300px;
  }

  /* Map */
  #running-map {
    height: 350px;
  }

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

  .stat-value {
    font-size: 1.3rem;
  }

  /* Auth prompt */
  .auth-prompt {
    padding: var(--spacing-lg);
  }

  .auth-prompt h3 {
    font-size: 1.2rem;
  }

  /* Footer */
  footer {
    padding: var(--spacing-lg) 0;
    font-size: 0.9rem;
  }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
  header,
  nav,
  footer,
  .btn,
  .map-controls,
  #running-map {
    display: none;
  }

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

  a {
    color: black;
    text-decoration: underline;
  }

  .publication {
    page-break-inside: avoid;
    border: 1px solid #ccc;
    margin-bottom: 1rem;
  }

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

/* ============================================
   Accessibility Improvements
   ============================================ */

/* Focus visible for keyboard navigation */
*:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* Reduced motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --color-text: #000;
    --color-bg: #FFF;
    --color-border: #000;
  }

  .btn,
  nav a,
  .pub-links a {
    border: 2px solid currentColor;
  }
}