/* Mobile-First UX Improvements - max-width: 768px */

/* ============================================
   1. MOBILE-FIRST TYPOGRAPHY
   ============================================ */
@media (max-width: 768px) {
  body {
    font-size: 16px;
    line-height: 1.7;
  }

  h1 {
    font-size: 1.75rem;
    line-height: 1.3;
    margin-bottom: 0.75rem;
  }

  h2 {
    font-size: 1.5rem;
    line-height: 1.4;
    margin-bottom: 0.75rem;
  }

  h3 {
    font-size: 1.25rem;
    line-height: 1.4;
    margin-bottom: 0.5rem;
  }

  p {
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: 1rem;
  }

  .hero h1 {
    font-size: 1.75rem;
    line-height: 1.3;
  }

  .hero p {
    font-size: 1rem;
    line-height: 1.6;
  }

  .tool-header h1 {
    font-size: 1.75rem;
    line-height: 1.3;
  }

  .tool-header p {
    font-size: 1rem;
  }

  .content-section h2 {
    font-size: 1.5rem;
    line-height: 1.4;
  }

  .content-section h3 {
    font-size: 1.25rem;
    line-height: 1.4;
  }

  .content-section p {
    font-size: 1rem;
    line-height: 1.7;
  }
}

/* ============================================
   2. SPACING & TOUCH COMFORT
   ============================================ */
@media (max-width: 768px) {
  /* Increase vertical spacing between sections */
  .content-section {
    margin: 2.5rem 0;
  }

  .tool-container {
    margin: 1.5rem auto;
    padding: 1.5rem;
  }

  .tool-header {
    margin-bottom: 1.5rem;
  }

  .faq-section {
    margin: 2.5rem 0;
  }

  .faq-item {
    margin-bottom: 1.25rem;
    padding: 1.25rem;
  }

  /* Ensure 44px minimum touch targets */
  .btn {
    min-height: 44px;
    padding: 0.875rem 1.25rem;
    font-size: 1rem;
  }

  input[type="file"] {
    min-height: 44px;
    padding: 0.75rem;
    font-size: 1rem;
  }

  textarea {
    min-height: 120px;
    padding: 1rem;
    font-size: 1rem;
  }

  .nav-links a {
    min-height: 44px;
    display: flex;
    align-items: center;
    padding: 0.75rem 0;
  }

  .footer-section a {
    min-height: 44px;
    display: flex;
    align-items: center;
    padding: 0.5rem 0;
  }

  /* Avoid cramped layouts */
  .card-grid {
    gap: 1.5rem;
    margin: 2rem 0;
  }

  .card {
    padding: 1.5rem;
  }
}

/* ============================================
   3. FULL-WIDTH INTERACTIONS
   ============================================ */
@media (max-width: 768px) {
  /* Make primary buttons full-width */
  .btn {
    width: 100%;
    display: block;
    text-align: center;
    margin-bottom: 0.75rem;
  }

  .btn + .btn {
    margin-left: 0;
  }

  /* File upload areas - clear and easy to tap */
  .upload-area {
    padding: 2rem 1.5rem;
    min-height: 180px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
  }

  .upload-icon {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
  }

  .upload-area h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
  }

  .upload-area p {
    font-size: 0.9rem;
  }

  /* Input fields full-width */
  input[type="text"],
  input[type="file"],
  textarea,
  select {
    width: 100%;
    box-sizing: border-box;
  }
}

/* ============================================
   4. TOOL UI FEEDBACK
   ============================================ */
@media (max-width: 768px) {
  /* Improve loading state visibility */
  .spinner {
    width: 48px;
    height: 48px;
    border-width: 4px;
  }

  /* Make alerts more visible but non-intrusive */
  .alert {
    padding: 1.25rem;
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1.25rem;
    border-radius: 8px;
  }

  .alert-success,
  .alert-error,
  .alert-info {
    border-width: 2px;
  }

  /* Disabled button state - already handled but ensure visibility */
  .btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
  }
}

/* ============================================
   5. CARD-BASED LAYOUT (MOBILE)
   ============================================ */
@media (max-width: 768px) {
  /* Wrap tool interfaces in soft cards */
  .tool-container {
    background: var(--bg-primary);
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    border: 1px solid var(--border-color);
  }

  /* Upload area as card */
  .upload-area {
    border-radius: 10px;
    background: var(--bg-secondary);
  }

  /* Results sections as cards */
  #results,
  #file-info,
  #score-section,
  #keyword-analysis,
  #suggestions,
  #stats {
    border-radius: 10px;
    margin-bottom: 1.5rem;
  }

  /* Subtle shadows and rounded corners */
  .card {
    border-radius: 10px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.06);
  }

  .faq-item {
    border-radius: 10px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  }
}

/* ============================================
   6. MOBILE NAVIGATION SAFETY
   ============================================ */
@media (max-width: 768px) {
  /* Header spacing fix - ensure header has proper height */
  header {
    position: fixed; /* Matches main CSS - header is fixed */
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    height: 80px; /* Fixed height matches body padding-top */
  }

  nav {
    padding: 1rem 1.25rem;
    position: relative;
    min-height: 60px;
  }

  .logo {
    font-size: 1.25rem;
  }

  /* Mobile nav menu - positioned fixed below header */
  .nav-links {
    display: none; /* Hidden by default */
    position: fixed;
    /* Header height is fixed at 80px on mobile */
    top: 80px; /* Matches header height */
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    gap: 0;
    border-top: 1px solid var(--border-color);
    z-index: 999;
    max-height: calc(100vh - 80px); /* Account for 80px header */
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  /* Show menu when active */
  .nav-links.active {
    display: flex;
  }

  .nav-links li {
    width: 100%;
    border-bottom: 1px solid var(--border-color);
  }

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

  .nav-links a {
    padding: 1rem;
    display: block;
    width: 100%;
  }

  .mobile-menu-toggle {
    min-width: 44px;
    min-height: 44px;
    font-size: 1.5rem;
    padding: 0.5rem;
    z-index: 1001;
    position: relative;
  }

  /* Prevent body scroll when menu is open */
  body.menu-open {
    overflow: hidden;
    position: fixed;
    width: 100%;
  }
}

/* ============================================
   7. FOOTER OPTIMIZATION
   ============================================ */
@media (max-width: 768px) {
  footer {
    padding: 2.5rem 1.5rem;
    margin-top: 3rem;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-section {
    margin-bottom: 1rem;
  }

  .footer-section h3 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
  }

  .footer-section ul {
    margin-left: 0;
  }

  .footer-section ul li {
    margin-bottom: 0.75rem;
  }

  .footer-section a {
    font-size: 0.95rem;
    padding: 0.5rem 0;
  }

  .footer-bottom {
    margin-top: 2rem;
    padding-top: 1.5rem;
    font-size: 0.9rem;
    text-align: center;
  }
}

/* ============================================
   ADDITIONAL MOBILE POLISH
   ============================================ */
@media (max-width: 768px) {
  /* Global Header Offset - Mobile (Standardized) */
  /* Uses .page-content class for consistent spacing across all pages */
  main.page-content {
    padding-top: 0;
    margin-top: 0;
    scroll-margin-top: 75px; /* Account for sticky header when scrolling to anchors */
  }

  /* Mobile header offset - pages without hero need spacing */
  /* Hero sections handle their own padding */
  main.page-content .hero {
    margin-top: 0;
    padding-top: 3rem;
  }

  /* Pages without hero: add top padding to account for sticky header (≈65-70px) */
  /* This works with existing inline padding styles */
  main.page-content > .container:first-child:not(.hero),
  main.page-content > article:first-child,
  main.page-content > .tool-container:first-child {
    padding-top: 3rem; /* Overrides inline padding-top, adds header clearance */
  }

  /* Ensure first heading is visible on mobile */
  main.page-content h1:first-child,
  main.page-content > .container h1:first-child,
  main.page-content > article > header > h1:first-child,
  main.page-content > .tool-container > .tool-header > h1:first-child {
    margin-top: 0;
    padding-top: 0;
  }

  /* Container padding */
  .container {
    padding: 0 1.25rem;
  }

  /* Hero section mobile optimization */
  .hero {
    padding: 3rem 1.5rem;
  }

  /* Content section spacing */
  .content-section ul {
    margin-left: 1.5rem;
    padding-right: 0.5rem;
  }

  .content-section li {
    margin-bottom: 0.75rem;
    line-height: 1.7;
  }

  /* Code blocks mobile friendly */
  .code-block {
    font-size: 0.85rem;
    padding: 1rem;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  /* Privacy notices mobile */
  .alert-info,
  div[style*="background: #eff6ff"],
  div[style*="background: #f0f9ff"] {
    padding: 1rem;
    font-size: 0.9rem;
    line-height: 1.6;
    border-radius: 8px;
  }

  /* File info display */
  #file-info {
    padding: 1.25rem;
    font-size: 0.95rem;
  }

  /* Score display mobile */
  #score-display {
    font-size: 2.5rem !important;
  }

  /* JSON editor mobile (already handled in inline styles but ensure consistency) */
  .json-editor {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .json-input,
  .json-output {
    min-height: 300px;
    font-size: 0.85rem;
  }

  /* Textarea mobile optimization */
  textarea {
    resize: vertical;
    -webkit-appearance: none;
    border-radius: 8px;
  }

  /* Input file mobile */
  input[type="file"] {
    width: 100%;
    padding: 0.75rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
  }
}