/* ===== Microservices Patterns — Study Guide Stylesheet ===== */

:root {
  --blue-900: #0d1b2a;
  --blue-800: #1b2a4a;
  --blue-700: #1e3a5f;
  --blue-600: #274c77;
  --blue-500: #2b6cb0;
  --blue-400: #3182ce;
  --blue-300: #63a4e8;
  --blue-200: #a3c4f3;
  --blue-100: #d0e2f7;
  --blue-50: #e8f1fb;
  --gray-900: #1a202c;
  --gray-700: #4a5568;
  --gray-600: #555;
  --gray-500: #718096;
  --gray-400: #a0aec0;
  --gray-300: #cbd5e0;
  --gray-200: #e2e8f0;
  --gray-100: #edf2f7;
  --gray-50: #f7fafc;
  --white: #ffffff;
  --accent-green: #2f855a;
  --accent-red: #c53030;
  --accent-amber: #b7791f;
  --font-sans: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'Fira Code', 'Consolas', 'Monaco', monospace;
  --max-width: 860px;
  --radius: 6px;
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  color: var(--gray-900);
  background-color: var(--gray-50);
  line-height: 1.7;
}

/* ===== Page Container ===== */

.page-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* ===== Header ===== */

.site-header {
  background: linear-gradient(135deg, var(--blue-800), var(--blue-600));
  color: var(--white);
  padding: 2.5rem 1.5rem;
  text-align: center;
  border-bottom: 4px solid var(--blue-400);
}

.site-header h1 {
  margin: 0 0 0.3rem;
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.site-header .subtitle {
  margin: 0;
  font-size: 1rem;
  font-weight: 400;
  opacity: 0.85;
}

.site-header .book-ref {
  margin-top: 0.6rem;
  font-size: 0.85rem;
  opacity: 0.65;
  font-style: italic;
}

/* ===== Chapter Header ===== */

.chapter-header {
  background: linear-gradient(135deg, var(--blue-800), var(--blue-600));
  color: var(--white);
  padding: 2rem 1.5rem;
  border-bottom: 4px solid var(--blue-400);
}

.chapter-header .breadcrumb {
  font-size: 0.85rem;
  opacity: 0.7;
  margin-bottom: 0.5rem;
}

.chapter-header .breadcrumb a {
  color: var(--blue-200);
  text-decoration: none;
}

.chapter-header .breadcrumb a:hover {
  text-decoration: underline;
}

.chapter-header h1 {
  margin: 0 0 0.3rem;
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.chapter-header .chapter-desc {
  margin: 0.5rem 0 0;
  font-size: 0.95rem;
  opacity: 0.8;
}

/* ===== Navigation Bar ===== */

.nav-bar {
  background: var(--blue-900);
  padding: 0.6rem 1.5rem;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.nav-bar a {
  color: var(--blue-200);
  text-decoration: none;
  font-size: 0.85rem;
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius);
  transition: background 0.2s, color 0.2s;
}

.nav-bar a:hover,
.nav-bar a.active {
  background: var(--blue-600);
  color: var(--white);
}

/* ===== Table of Contents ===== */

.toc {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-left: 4px solid var(--blue-500);
  border-radius: var(--radius);
  padding: 1.5rem 2rem;
  margin: 2rem 0;
}

.toc h2 {
  font-size: 1.15rem;
  color: var(--blue-700);
  margin: 0 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--gray-200);
}

.toc ol {
  margin: 0;
  padding-left: 0;
  list-style: none;
}

.toc > ol > li {
  margin-bottom: 0.6rem;
}

.toc ol ol {
  padding-left: 1.4rem;
  margin-top: 0.3rem;
}

.toc ol ol li {
  margin-bottom: 0.25rem;
}

.toc a {
  color: var(--blue-600);
  text-decoration: none;
  font-size: 0.95rem;
  line-height: 1.5;
}

.toc a:hover {
  color: var(--blue-400);
  text-decoration: underline;
}

.toc .toc-section > a {
  font-weight: 600;
}

/* ===== Section Headings ===== */

h2.section-title {
  font-size: 1.4rem;
  color: var(--blue-700);
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--blue-100);
}

h3.subsection-title {
  font-size: 1.15rem;
  color: var(--blue-800);
  margin: 2rem 0 0.8rem;
}

h4.subsubsection-title {
  font-size: 1.02rem;
  color: var(--gray-700);
  margin: 1.5rem 0 0.6rem;
  font-weight: 600;
}

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

.content-section {
  margin-bottom: 2rem;
}

.content-section p {
  margin: 0.6rem 0;
  color: var(--gray-900);
}

.content-section ul,
.content-section ol {
  margin: 0.6rem 0;
  padding-left: 1.5rem;
}

.content-section li {
  margin-bottom: 0.35rem;
}

/* ===== Info Boxes ===== */

.info-box {
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  margin: 1.2rem 0;
  font-size: 0.93rem;
}

.info-box p {
  margin: 0.3rem 0;
}

.info-box strong {
  display: inline;
}

.note-box {
  background: var(--blue-50);
  border-left: 4px solid var(--blue-400);
}

.analogy-box {
  background: #fefce8;
  border-left: 4px solid var(--accent-amber);
}

.warning-box {
  background: #fff5f5;
  border-left: 4px solid var(--accent-red);
}

.key-point-box {
  background: #f0fff4;
  border-left: 4px solid var(--accent-green);
}

/* ===== Pattern Summary ===== */

.pattern-summary {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 1.2rem 1.4rem;
  margin: 1.2rem 0;
}

.pattern-summary h4 {
  color: var(--blue-600);
  margin: 0 0 0.6rem;
  font-size: 1rem;
}

.pattern-summary .ps-row {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
  font-size: 0.93rem;
}

.pattern-summary .ps-label {
  font-weight: 600;
  color: var(--blue-700);
  min-width: 90px;
  flex-shrink: 0;
}

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

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2rem 0;
  font-size: 0.93rem;
}

.comparison-table th {
  background: var(--blue-600);
  color: var(--white);
  text-align: left;
  padding: 0.6rem 0.8rem;
  font-weight: 600;
}

.comparison-table td {
  padding: 0.5rem 0.8rem;
  border-bottom: 1px solid var(--gray-200);
  vertical-align: top;
}

.comparison-table tr:nth-child(even) {
  background: var(--gray-50);
}

.comparison-table tr:hover {
  background: var(--blue-50);
}

/* ===== Key Takeaways ===== */

.takeaways {
  background: var(--blue-50);
  border: 1px solid var(--blue-200);
  border-radius: var(--radius);
  padding: 1.2rem 1.4rem;
  margin: 2rem 0;
}

.takeaways h3 {
  color: var(--blue-700);
  font-size: 1.05rem;
  margin: 0 0 0.8rem;
}

.takeaways ul {
  margin: 0;
  padding-left: 1.3rem;
}

.takeaways li {
  margin-bottom: 0.4rem;
  font-size: 0.93rem;
}

/* ===== Back to Top Button ===== */

.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--blue-600);
  color: var(--white);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-size: 1.2rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  transition: background 0.2s, transform 0.2s;
  z-index: 100;
}

.back-to-top:hover {
  background: var(--blue-400);
  transform: translateY(-2px);
}

/* ===== Index Page — Chapter Cards ===== */

.chapter-grid {
  display: grid;
  gap: 1rem;
  margin: 2rem 0;
}

.chapter-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-left: 4px solid var(--blue-500);
  border-radius: var(--radius);
  padding: 1.2rem 1.5rem;
  text-decoration: none;
  color: var(--gray-900);
  transition: box-shadow 0.2s, border-color 0.2s;
  display: block;
}

.chapter-card:hover {
  box-shadow: 0 2px 12px rgba(43, 108, 176, 0.15);
  border-left-color: var(--blue-400);
}

.chapter-card .card-number {
  font-size: 0.8rem;
  color: var(--blue-500);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.chapter-card .card-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--blue-800);
  margin: 0.2rem 0 0.4rem;
}

.chapter-card .card-desc {
  font-size: 0.9rem;
  color: var(--gray-600);
  margin: 0;
}

/* ===== Chapter Navigation Footer ===== */

.chapter-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 2px solid var(--gray-200);
  gap: 1rem;
}

.chapter-nav a {
  color: var(--blue-600);
  text-decoration: none;
  font-size: 0.93rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border: 1px solid var(--blue-200);
  border-radius: var(--radius);
  transition: background 0.2s;
}

.chapter-nav a:hover {
  background: var(--blue-50);
}

.chapter-nav .prev::before {
  content: "\2190\00a0";
}

.chapter-nav .next::after {
  content: "\00a0\2192";
}

/* ===== Stats Badge ===== */

.stats-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0;
}

.stat-badge {
  background: var(--blue-50);
  border: 1px solid var(--blue-200);
  border-radius: 999px;
  padding: 0.25rem 0.75rem;
  font-size: 0.8rem;
  color: var(--blue-700);
  font-weight: 600;
}

/* ===== Footer ===== */

.site-footer {
  text-align: center;
  padding: 2rem 1rem;
  font-size: 0.82rem;
  color: var(--gray-500);
  border-top: 1px solid var(--gray-200);
  margin-top: 2rem;
}

/* ===== Responsive ===== */

@media (max-width: 640px) {
  .page-container {
    padding: 1.2rem 1rem 3rem;
  }

  .site-header h1,
  .chapter-header h1 {
    font-size: 1.4rem;
  }

  h2.section-title {
    font-size: 1.2rem;
  }

  h3.subsection-title {
    font-size: 1.05rem;
  }

  .toc {
    padding: 1rem 1.2rem;
  }

  .pattern-summary .ps-row {
    flex-direction: column;
    gap: 0.1rem;
  }

  .comparison-table {
    font-size: 0.85rem;
  }

  .chapter-nav {
    flex-direction: column;
  }

  .back-to-top {
    bottom: 1rem;
    right: 1rem;
    width: 38px;
    height: 38px;
    font-size: 1rem;
  }

  .nav-bar {
    padding: 0.5rem 0.8rem;
    gap: 0.4rem;
  }

  .nav-bar a {
    font-size: 0.78rem;
  }
}

@media print {
  .back-to-top,
  .nav-bar {
    display: none;
  }

  .site-header,
  .chapter-header {
    background: var(--blue-700);
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  body {
    font-size: 11pt;
  }
}