/* ==========================================================================
   療養型病院ナビ 広島版 CSS
   モバイルファースト・高齢者向けアクセシビリティ対応
   ========================================================================== */

/* ==========================================================================
   CSS Reset & Base Styles
   ========================================================================== */

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

html {
  font-size: 16px; /* ベースフォントサイズ */
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
}

body {
  font-family: 'Hiragino Kaku Gothic Pro', 'ヒラギノ角ゴ Pro', 'Yu Gothic Medium', '游ゴシック Medium', YuGothic, '游ゴシック体', 'Noto Sans JP', sans-serif;
  font-size: 18px; /* 高齢者向けに大きめ */
  line-height: 1.8; /* 読みやすい行間 */
  color: #333333;
  background-color: #f8fbff;
  word-break: break-word;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==========================================================================
   Color Variables (CSS Custom Properties)
   ========================================================================== */

:root {
  /* Primary Colors (医療系ブルー) */
  --primary-blue: #2563eb;
  --primary-blue-light: #3b82f6;
  --primary-blue-dark: #1d4ed8;
  --primary-blue-pale: #eff6ff;
  
  /* Secondary Colors (安心感のグリーン) */
  --secondary-green: #059669;
  --secondary-green-light: #10b981;
  --secondary-green-dark: #047857;
  --secondary-green-pale: #f0fdf4;
  
  /* Neutral Colors */
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  
  /* Status Colors */
  --success: #22c55e;
  --warning: #f59e0b;
  --error: #ef4444;
  --info: #06b6d4;
  
  /* Typography */
  --text-primary: #1f2937;
  --text-secondary: #4b5563;
  --text-muted: #6b7280;
  
  /* Spacing */
  --space-xs: 0.5rem;   /* 8px */
  --space-sm: 0.75rem;  /* 12px */
  --space-md: 1rem;     /* 16px */
  --space-lg: 1.5rem;   /* 24px */
  --space-xl: 2rem;     /* 32px */
  --space-2xl: 3rem;    /* 48px */
  --space-3xl: 4rem;    /* 64px */
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

/* ==========================================================================
   Typography
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: var(--space-lg);
  color: var(--text-primary);
}

h1 {
  font-size: 1.75rem; /* 28px */
  color: var(--primary-blue-dark);
  margin-bottom: var(--space-xl);
}

h2 {
  font-size: 1.5rem; /* 24px */
  color: var(--primary-blue);
  border-left: 4px solid var(--primary-blue);
  padding-left: var(--space-md);
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-xl);
}

h3 {
  font-size: 1.25rem; /* 20px */
  color: var(--secondary-green-dark);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
}

h4 {
  font-size: 1.125rem; /* 18px */
  color: var(--text-primary);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

p {
  margin-bottom: var(--space-lg);
  line-height: 1.8;
}

strong {
  font-weight: 700;
  color: var(--primary-blue-dark);
}

em {
  font-style: normal;
  background: linear-gradient(transparent 60%, #fef08a 60%);
  padding: 0 2px;
}

/* ==========================================================================
   Links
   ========================================================================== */

a {
  color: var(--primary-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: all 0.3s ease;
}

a:hover,
a:focus {
  color: var(--primary-blue-dark);
  text-decoration-thickness: 2px;
  outline: 2px solid var(--primary-blue-light);
  outline-offset: 2px;
}

a:visited {
  color: var(--primary-blue-dark);
}

/* 外部リンクアイコン */
a[target="_blank"]:after {
  content: " ↗";
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Layout Components
   ========================================================================== */

/* Header */
header {
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-dark) 100%);
  color: white;
  padding: var(--space-lg) var(--space-md);
  box-shadow: var(--shadow-md);
}

.site-title {
  font-size: 1.375rem; /* 22px */
  font-weight: 700;
  text-align: center;
}

/* Breadcrumb Navigation */
.breadcrumb {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  margin-top: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background-color: var(--gray-50);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
}

.breadcrumb li {
  display: flex;
  align-items: center;
}

.breadcrumb li:not(:last-child):after {
  content: ">";
  margin: 0 var(--space-sm);
  color: var(--text-muted);
}

.breadcrumb a {
  color: var(--primary-blue);
  text-decoration: none;
  padding: var(--space-xs);
  border-radius: var(--radius-sm);
  transition: background-color 0.3s ease;
}

.breadcrumb a:hover {
  background-color: var(--primary-blue-pale);
}

/* Main Content */
main {
  max-width: 100%;
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md);
  background-color: white;
  min-height: 50vh;
}

/* Main Visual */
.mainvisual {
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--space-xl);
}

/* Lead Text */
.lead-text {
  background: linear-gradient(135deg, var(--primary-blue-pale) 0%, var(--secondary-green-pale) 100%);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-2xl);
  border: 1px solid var(--gray-200);
}

.lead-text p {
  font-size: 1.125rem; /* 18px */
  line-height: 1.7;
  margin-bottom: 0;
  text-align: center;
}

/* ==========================================================================
   Table of Contents (目次)
   ========================================================================== */

.toc {
  background-color: var(--gray-50);
  border: 2px solid var(--primary-blue-light);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  margin-bottom: var(--space-2xl);
}

.toc h2 {
  font-size: 1.25rem;
  color: var(--primary-blue-dark);
  margin-bottom: var(--space-lg);
  text-align: center;
  border: none;
  padding: 0;
}

.toc ol {
  list-style: none;
  counter-reset: toc-counter;
}

.toc li {
  counter-increment: toc-counter;
  margin-bottom: var(--space-md);
  padding-left: var(--space-lg);
  position: relative;
}

.toc li:before {
  content: counter(toc-counter);
  position: absolute;
  left: 0;
  top: 0;
  background-color: var(--primary-blue);
  color: white;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 600;
}

.toc a {
  display: block;
  padding: var(--space-sm);
  color: var(--text-primary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all 0.3s ease;
  border: 1px solid transparent;
}

.toc a:hover,
.toc a:focus {
  background-color: var(--primary-blue-pale);
  border-color: var(--primary-blue-light);
  color: var(--primary-blue-dark);
}

/* ==========================================================================
   Content Sections
   ========================================================================== */

section {
  margin-bottom: var(--space-3xl);
  scroll-margin-top: var(--space-xl);
}

/* Section Images */
section img {
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  margin: var(--space-xl) 0;
}

/* ==========================================================================
   Lists
   ========================================================================== */

ul, ol {
  margin-bottom: var(--space-lg);
  padding-left: var(--space-xl);
}

li {
  margin-bottom: var(--space-sm);
  line-height: 1.7;
}

/* Custom styled lists */
.role-list,
.target-categories,
.insurance-benefits,
.step-content,
.checkpoint {
  background-color: var(--gray-50);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  margin: var(--space-lg) 0;
  border-left: 4px solid var(--secondary-green);
}

.role-list h4,
.target-categories h4,
.insurance-benefits h4,
.checkpoint h4 {
  color: var(--secondary-green-dark);
  margin-bottom: var(--space-md);
  font-size: 1.125rem;
}

/* Warning Lists */
.warning-signs {
  background-color: #fef2f2;
  border-left: 4px solid var(--error);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
}

.warning-signs li {
  color: var(--text-primary);
  font-weight: 500;
}

/* Success Points */
.success-points {
  counter-reset: success-counter;
  list-style: none;
  padding-left: 0;
}

.success-points li {
  counter-increment: success-counter;
  background-color: var(--secondary-green-pale);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--secondary-green);
  position: relative;
  padding-left: var(--space-2xl);
}

.success-points li:before {
  content: counter(success-counter);
  position: absolute;
  left: var(--space-md);
  top: var(--space-md);
  background-color: var(--secondary-green);
  color: white;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
}

/* ==========================================================================
   Tables
   ========================================================================== */

table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-xl) 0;
  font-size: 0.9rem; /* モバイルで読みやすく */
  box-shadow: var(--shadow-sm);
  border-radius: var(--radius-md);
  overflow: hidden;
}

thead {
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-dark) 100%);
  color: white;
}

thead th {
  padding: var(--space-md) var(--space-sm);
  text-align: left;
  font-weight: 600;
  font-size: 0.875rem;
}

tbody tr {
  border-bottom: 1px solid var(--gray-200);
}

tbody tr:nth-child(even) {
  background-color: var(--gray-50);
}

tbody tr:hover {
  background-color: var(--primary-blue-pale);
}

td {
  padding: var(--space-md) var(--space-sm);
  vertical-align: top;
  line-height: 1.6;
}

/* Table responsive wrapper */
.table-wrapper {
  overflow-x: auto;
  margin: var(--space-lg) -var(--space-md);
  padding: 0 var(--space-md);
}

/* Highlighted table rows */
.total-row {
  background-color: var(--secondary-green-pale) !important;
  font-weight: 600;
  color: var(--secondary-green-dark);
}

/* ==========================================================================
   Special Content Blocks
   ========================================================================== */

/* Highlight Messages */
.highlight-text {
  background: linear-gradient(135deg, var(--primary-blue-pale) 0%, var(--secondary-green-pale) 100%);
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  border: 2px solid var(--primary-blue-light);
  font-weight: 500;
  text-align: center;
  margin: var(--space-xl) 0;
}

.key-message {
  background-color: var(--secondary-green-pale);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  border-left: 6px solid var(--secondary-green);
  font-size: 1.125rem;
  line-height: 1.7;
  margin: var(--space-xl) 0;
}

/* Cost Advice */
.cost-advice {
  background-color: var(--info);
  color: white;
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  margin: var(--space-lg) 0;
}

/* Selection Advice */
.selection-advice {
  background-color: var(--secondary-green-pale);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  border: 1px solid var(--secondary-green-light);
  margin: var(--space-lg) 0;
}

/* Flow Tips */
.flow-tips {
  background: linear-gradient(135deg, #fff7ed 0%, #fef3c7 100%);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--warning);
  margin: var(--space-lg) 0;
}

/* Final Advice */
.final-advice {
  background-color: var(--primary-blue-pale);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  border: 2px solid var(--primary-blue-light);
  margin: var(--space-xl) 0;
}

/* Selection Warning */
.selection-warning {
  background-color: #fef2f2;
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  border: 2px solid var(--error);
  margin: var(--space-lg) 0;
}

.selection-warning h3 {
  color: var(--error);
  margin-bottom: var(--space-md);
}

/* ==========================================================================
   Flow & Step Components
   ========================================================================== */

.admission-flow {
  margin: var(--space-xl) 0;
}

.step-content {
  background-color: white;
  border: 1px solid var(--gray-200);
  border-left: 4px solid var(--primary-blue);
}

.step-content h5 {
  color: var(--secondary-green-dark);
  font-size: 1rem;
  margin: var(--space-md) 0 var(--space-sm) 0;
}

/* Selection Flow */
.selection-flow {
  background-color: var(--gray-50);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  margin: var(--space-lg) 0;
}

.selection-flow h4 {
  color: var(--primary-blue-dark);
  margin-bottom: var(--space-sm);
}

.highlight {
  background: linear-gradient(transparent 60%, var(--secondary-green-light) 60%);
  color: var(--secondary-green-dark);
  font-weight: 600;
  padding: 0 2px;
}

/* ==========================================================================
   Ranking Components
   ========================================================================== */

.ranking-criteria {
  background-color: var(--primary-blue-pale);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  margin: var(--space-lg) 0;
  border-left: 4px solid var(--primary-blue);
}

.ranking-list {
  margin: var(--space-xl) 0;
}

.ranking-item {
  background-color: white;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  margin-bottom: var(--space-xl);
  box-shadow: var(--shadow-md);
  position: relative;
}

.rank-1 {
  border-color: #ffd700;
  background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
}

.rank-2 {
  border-color: #c0c0c0;
  background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
}

.rank-3 {
  border-color: #cd7f32;
  background: linear-gradient(135deg, #fef7ed 0%, #fed7aa 100%);
}

.rank-number {
  position: absolute;
  top: -10px;
  left: var(--space-lg);
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-dark) 100%);
  color: white;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-xl);
  font-weight: 700;
  font-size: 1.125rem;
  box-shadow: var(--shadow-md);
}

.ranking-score {
  text-align: right;
  font-weight: 600;
  color: var(--secondary-green-dark);
  margin-bottom: var(--space-md);
}

.hospital-info {
  margin: var(--space-lg) 0;
}

.hospital-info p:first-child {
  font-weight: 600;
  color: var(--text-primary);
}

.contact-info {
  background-color: var(--gray-50);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  margin-top: var(--space-lg);
}

.additional-ranking {
  background-color: var(--gray-50);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  list-style: none;
  padding-left: var(--space-lg);
}

.additional-ranking li {
  margin-bottom: var(--space-sm);
  font-weight: 500;
}

.ranking-notes {
  background-color: #fef7ed;
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--warning);
  margin: var(--space-lg) 0;
}

/* ==========================================================================
   FAQ Components
   ========================================================================== */

.faq-content {
  margin: var(--space-xl) 0;
}

.faq-item {
  background-color: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.faq-question {
  background: linear-gradient(135deg, var(--primary-blue-pale) 0%, var(--secondary-green-pale) 100%);
  padding: var(--space-lg);
  margin: 0;
  color: var(--primary-blue-dark);
  font-size: 1.125rem;
  border-bottom: 1px solid var(--gray-200);
  cursor: pointer;
  position: relative;
}

.faq-question:before {
  content: "Q";
  position: absolute;
  left: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  background-color: var(--primary-blue);
  color: white;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.875rem;
}

.faq-question {
  padding-left: var(--space-2xl);
}

.faq-answer {
  padding: var(--space-lg);
}

.faq-answer:before {
  content: "A";
  display: inline-block;
  background-color: var(--secondary-green);
  color: white;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  text-align: center;
  line-height: 1.5rem;
  font-weight: 700;
  font-size: 0.875rem;
  margin-right: var(--space-sm);
  vertical-align: top;
  flex-shrink: 0;
}

.faq-answer p {
  margin-left: 2rem;
  margin-top: -1.5rem;
  padding-top: 0.25rem;
  line-height: 1.7;
}

/* ==========================================================================
   Author & Footer Components
   ========================================================================== */

.author-box,
.related-pages {
  background: linear-gradient(135deg, var(--gray-50) 0%, var(--primary-blue-pale) 100%);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  margin: var(--space-2xl) 0;
  border: 1px solid var(--gray-200);
}

.author-info,
.related-links {
  display: grid;
  gap: var(--space-lg);
}

.author-item,
.related-link-item {
  background-color: white;
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.author-item h3,
.related-link-item h3 {
  color: var(--primary-blue-dark);
  margin-bottom: var(--space-sm);
  font-size: 1.125rem;
}

.author-expertise,
.information-sources {
  background-color: white;
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  margin-top: var(--space-lg);
}

/* Footer */
footer {
  background: linear-gradient(135deg, var(--gray-800) 0%, var(--gray-900) 100%);
  color: var(--gray-200);
  padding: var(--space-2xl) var(--space-md);
  margin-top: var(--space-3xl);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  gap: var(--space-xl);
}

.footer-content h3,
.footer-content h4 {
  color: white;
  margin-bottom: var(--space-md);
}

.footer-links ul {
  list-style: none;
  padding-left: 0;
}

.footer-links a {
  color: var(--gray-300);
  text-decoration: none;
  padding: var(--space-xs) 0;
  display: block;
  transition: color 0.3s ease;
}

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

.disclaimer {
  font-size: 0.875rem;
  color: var(--gray-400);
  line-height: 1.6;
}

.copyright {
  text-align: center;
  border-top: 1px solid var(--gray-700);
  padding-top: var(--space-lg);
  margin-top: var(--space-lg);
  font-size: 0.875rem;
  color: var(--gray-400);
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }

.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }

.bg-primary { background-color: var(--primary-blue); }
.bg-secondary { background-color: var(--secondary-green); }
.bg-gray { background-color: var(--gray-100); }

.mb-0 { margin-bottom: 0; }
.mt-lg { margin-top: var(--space-lg); }
.mb-lg { margin-bottom: var(--space-lg); }

/* ==========================================================================
   Responsive Design - Tablet (768px and up)
   ========================================================================== */

@media (min-width: 768px) {
  body {
    font-size: 18px;
  }
  
  h1 {
    font-size: 2.25rem; /* 36px */
  }
  
  h2 {
    font-size: 1.875rem; /* 30px */
  }
  
  h3 {
    font-size: 1.5rem; /* 24px */
  }
  
  main {
    padding: var(--space-2xl) var(--space-xl);
  }
  
  .site-title {
    font-size: 1.75rem; /* 28px */
  }
  
  .lead-text {
    padding: var(--space-2xl);
  }
  
  .toc {
    padding: var(--space-2xl);
  }
  
  .toc ol {
    columns: 2;
    column-gap: var(--space-xl);
  }
  
  .author-info,
  .related-links {
    grid-template-columns: 1fr 1fr;
  }
  
  .footer-content {
    grid-template-columns: 2fr 1fr 1fr;
  }
  
  /* Table improvements */
  table {
    font-size: 1rem;
  }
  
  .table-wrapper {
    margin: var(--space-xl) 0;
    padding: 0;
  }
  
  /* FAQ improvements */
  .faq-content {
    display: grid;
    gap: var(--space-lg);
  }
}

/* ==========================================================================
   Responsive Design - Desktop (1024px and up)
   ========================================================================== */

@media (min-width: 1024px) {
  body {
    font-size: 18px;
  }
  
  main {
    max-width: 1200px;
    padding: var(--space-2xl);
  }
  
  h1 {
    font-size: 2.5rem; /* 40px */
  }
  
  h2 {
    font-size: 2rem; /* 32px */
  }
  
  .site-title {
    font-size: 2rem; /* 32px */
  }
  
  /* Multi-column layouts */
  .toc ol {
    columns: 2;
    column-gap: var(--space-2xl);
  }
  
  .author-info {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
  }
  
  .related-links {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
  }
  
  .footer-content {
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-2xl);
  }
  
  /* Enhanced hover effects for desktop */
  .ranking-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
  }
  
  .faq-item:hover {
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
  }
}

/* ==========================================================================
   Responsive Design - Large Desktop (1280px and up)
   ========================================================================== */

@media (min-width: 1280px) {
  main {
    max-width: 1400px;
  }
  
  .toc ol {
    columns: 3;
  }
  
  .related-links {
    grid-template-columns: repeat(3, 1fr);
  }
  
  /* Larger spacing for large screens */
  section {
    margin-bottom: var(--space-3xl);
  }
}

/* ==========================================================================
   Accessibility Enhancements
   ========================================================================== */

/* Focus indicators */
*:focus {
  outline: 2px solid var(--primary-blue);
  outline-offset: 2px;
}

/* Skip to main content link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary-blue);
  color: white;
  padding: 8px;
  text-decoration: none;
  border-radius: var(--radius-sm);
  z-index: 1000;
}

.skip-link:focus {
  top: 6px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --text-primary: #000000;
    --text-secondary: #333333;
    --primary-blue: #0000ff;
    --secondary-green: #008000;
  }
  
  body {
    background-color: white;
  }
  
  .lead-text,
  .toc,
  .faq-question {
    background-color: #f0f0f0;
    border: 2px solid var(--text-primary);
  }
}

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

/* Print styles (minimal since not required) */
@media print {
  * {
    background: white !important;
    color: black !important;
    box-shadow: none !important;
  }
  
  header,
  footer,
  .toc {
    display: none;
  }
  
  main {
    margin: 0;
    padding: 0;
  }
  
  h1, h2, h3 {
    page-break-after: avoid;
  }
  
  table {
    page-break-inside: avoid;
  }
}

/* ==========================================================================
   IE11 Compatibility
   ========================================================================== */

/* CSS Grid fallback for IE11 */
@media screen and (-ms-high-contrast: active), 
       screen and (-ms-high-contrast: none) {
  
  .author-info,
  .related-links,
  .footer-content {
    display: block;
  }
  
  .author-item,
  .related-link-item {
    margin-bottom: var(--space-lg);
  }
  
  /* Flexbox fallbacks */
  .breadcrumb {
    display: block;
  }
  
  .breadcrumb li {
    display: inline-block;
    margin-right: var(--space-sm);
  }
  
  /* CSS custom properties fallback */
  body {
    color: #333333;
    background-color: #f8fbff;
  }
  
  h1 {
    color: #1d4ed8;
  }
  
  h2 {
    color: #2563eb;
    border-left: 4px solid #2563eb;
  }
  
  h3 {
    color: #047857;
  }
  
  strong {
    color: #1d4ed8;
  }
  
  a {
    color: #2563eb;
  }
  
  .primary-blue {
    background-color: #2563eb;
  }
  
  .secondary-green {
    background-color: #059669;
  }
}

/* ==========================================================================
   Performance Optimizations
   ========================================================================== */

/* GPU acceleration for smooth animations */
.ranking-item,
.faq-item {
  transform: translateZ(0);
  backface-visibility: hidden;
}

/* Optimize font rendering */
body {
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Lazy loading preparation */
img {
  max-width: 100%;
  height: auto;
}

/* ==========================================================================
   Additional Utility Classes for Content Management
   ========================================================================== */

/* Content width limiters */
.content-narrow {
  max-width: 600px;
  margin: 0 auto;
}

.content-medium {
  max-width: 800px;
  margin: 0 auto;
}

/* Spacing utilities */
.section-spacing {
  margin: var(--space-2xl) 0;
}

.content-spacing {
  margin: var(--space-lg) 0;
}

/* Color utilities */
.text-primary-blue {
  color: var(--primary-blue);
}

.text-secondary-green {
  color: var(--secondary-green);
}

.text-error {
  color: var(--error);
}

.text-success {
  color: var(--success);
}

/* Background utilities */
.bg-light {
  background-color: var(--gray-50);
}

.bg-primary-pale {
  background-color: var(--primary-blue-pale);
}

.bg-secondary-pale {
  background-color: var(--secondary-green-pale);
}

/* Border utilities */
.border-primary {
  border: 1px solid var(--primary-blue);
}

.border-secondary {
  border: 1px solid var(--secondary-green);
}

.border-left-primary {
  border-left: 4px solid var(--primary-blue);
}

.border-left-secondary {
  border-left: 4px solid var(--secondary-green);
}

/* Box shadow utilities */
.shadow-light {
  box-shadow: var(--shadow-sm);
}

.shadow-medium {
  box-shadow: var(--shadow-md);
}

.shadow-heavy {
  box-shadow: var(--shadow-lg);
}

/* ==========================================================================
   Custom Scrollbar (WebKit browsers)
   ========================================================================== */

::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
  background: var(--gray-400);
  border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--gray-500);
}

/* ==========================================================================
   Animation Classes (for potential JavaScript enhancements)
   ========================================================================== */

.fade-in {
  opacity: 0;
  animation: fadeIn 0.6s ease forwards;
}

@keyframes fadeIn {
  to {
    opacity: 1;
  }
}

.slide-up {
  transform: translateY(20px);
  opacity: 0;
  animation: slideUp 0.6s ease forwards;
}

@keyframes slideUp {
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* ==========================================================================
   End of CSS
   ========================================================================== */