:root {
  --color-primary: #2E3A8C;
  --color-secondary: #0F766E;
  --color-accent: #D97706;
  --color-background: #F7F4EF;
  --color-surface: #FFFFFF;
  --color-text: #111827;
  --color-text-muted: #4B5563;
  --color-border: #D1D5DB;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(17, 24, 39, 0.10);
  --space: 1rem;
  --font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: Georgia, "Times New Roman", Times, serif;
}

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

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

body {
  font-family: var(--font-system);
  background-color: var(--color-background);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  grid-template-columns: 1fr;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  line-height: 1.2;
  margin-bottom: calc(var(--space) * 0.75);
  font-weight: 700;
  color: var(--color-primary);
}

h1 {
  font-size: clamp(1.75rem, 4vw + 1rem, 2.75rem);
  margin-bottom: var(--space);
  border-bottom: 3px solid var(--color-accent);
  padding-bottom: calc(var(--space) * 0.5);
}

h2 {
  font-size: clamp(1.5rem, 3vw + 0.75rem, 2.25rem);
  margin-top: calc(var(--space) * 2);
  margin-bottom: calc(var(--space) * 0.75);
}

h3 {
  font-size: clamp(1.25rem, 2vw + 0.5rem, 1.75rem);
  margin-top: calc(var(--space) * 1.5);
  color: var(--color-secondary);
}

h4 {
  font-size: clamp(1.125rem, 1.5vw + 0.5rem, 1.5rem);
}

p {
  margin-bottom: var(--space);
  max-width: 70ch;
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  transition: color 0.2s ease, text-decoration-color 0.2s ease;
}

a:hover {
  color: var(--color-secondary);
  text-decoration-color: var(--color-accent);
}

a:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

header {
  background-color: var(--color-surface);
  border-bottom: 2px solid var(--color-border);
  padding: calc(var(--space) * 1.5) var(--space);
  box-shadow: var(--shadow);
}

header .site-name {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3vw + 0.5rem, 2rem);
  color: var(--color-primary);
  margin-bottom: calc(var(--space) * 0.75);
  font-weight: 700;
}

nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--space) * 1.25);
  align-items: center;
}

nav a {
  text-decoration: none;
  font-weight: 500;
  padding: calc(var(--space) * 0.5) calc(var(--space) * 0.75);
  border-radius: calc(var(--radius) * 0.5);
  transition: background-color 0.2s ease, color 0.2s ease;
}

nav a:hover {
  background-color: var(--color-background);
  color: var(--color-secondary);
}

nav[aria-label="Breadcrumb"] {
  background-color: var(--color-surface);
  padding: calc(var(--space) * 0.75) var(--space);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: calc(var(--space) * 1.5);
}

nav[aria-label="Breadcrumb"] ul {
  gap: calc(var(--space) * 0.5);
  font-size: 0.9rem;
}

nav[aria-label="Breadcrumb"] li:not(:last-child)::after {
  content: "›";
  margin-left: calc(var(--space) * 0.5);
  color: var(--color-text-muted);
}

main {
  display: grid;
  grid-template-columns: 1fr;
  gap: calc(var(--space) * 2);
  padding: calc(var(--space) * 2) var(--space);
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

article, section {
  background-color: var(--color-surface);
  padding: calc(var(--space) * 1.5);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: calc(var(--space) * 1.5);
}

aside {
  background-color: var(--color-surface);
  padding: calc(var(--space) * 1.25);
  border-radius: var(--radius);
  border-left: 4px solid var(--color-accent);
  box-shadow: var(--shadow);
  margin: calc(var(--space) * 1.5) 0;
}

aside h3, aside h4 {
  margin-top: 0;
}

blockquote {
  background-color: var(--color-surface);
  border-left: 5px solid var(--color-accent);
  padding: calc(var(--space) * 1.25);
  margin: calc(var(--space) * 1.5) 0;
  font-style: italic;
  color: var(--color-text-muted);
  border-radius: calc(var(--radius) * 0.5);
  box-shadow: 0 2px 8px rgba(17, 24, 39, 0.05);
}

blockquote p:last-child {
  margin-bottom: 0;
}

details {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: calc(var(--space) * 1);
  margin-bottom: var(--space);
  transition: box-shadow 0.2s ease;
}

details:hover {
  box-shadow: 0 4px 12px rgba(17, 24, 39, 0.08);
}

details[open] {
  border-color: var(--color-primary);
  box-shadow: 0 4px 16px rgba(46, 58, 140, 0.12);
}

summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--color-primary);
  padding: calc(var(--space) * 0.5);
  border-radius: calc(var(--radius) * 0.5);
  list-style: none;
  display: flex;
  align-items: center;
  transition: background-color 0.2s ease;
}

summary::-webkit-details-marker {
  display: none;
}

summary::before {
  content: "▸";
  margin-right: calc(var(--space) * 0.5);
  transition: transform 0.2s ease;
  display: inline-block;
  color: var(--color-accent);
  font-size: 1.2em;
}

details[open] summary::before {
  transform: rotate(90deg);
}

summary:hover {
  background-color: var(--color-background);
}

summary:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

details > *:not(summary) {
  margin-top: var(--space);
  padding-left: calc(var(--space) * 1.5);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: calc(var(--space) * 1.5) 0;
  background-color: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.table-container {
  overflow-x: auto;
  margin: calc(var(--space) * 1.5) 0;
  border-radius: var(--radius);
}

thead {
  background-color: var(--color-primary);
  color: var(--color-surface);
}

th {
  padding: calc(var(--space) * 0.75) var(--space);
  text-align: left;
  font-weight: 600;
  border-bottom: 2px solid var(--color-accent);
}

td {
  padding: calc(var(--space) * 0.75) var(--space);
  border-bottom: 1px solid var(--color-border);
}

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

tbody tr:hover {
  background-color: rgba(46, 58, 140, 0.05);
  transition: background-color 0.2s ease;
}

ul, ol {
  margin-bottom: var(--space);
  padding-left: calc(var(--space) * 2);
}

li {
  margin-bottom: calc(var(--space) * 0.5);
}

footer {
  background-color: var(--color-surface);
  border-top: 2px solid var(--color-border);
  padding: calc(var(--space) * 2) var(--space);
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-top: calc(var(--space) * 3);
}

footer p {
  max-width: none;
  margin-bottom: calc(var(--space) * 0.5);
}

@media (min-width: 768px) {
  main {
    padding: calc(var(--space) * 3) calc(var(--space) * 2);
  }

  article, section {
    padding: calc(var(--space) * 2);
  }

  nav ul {
    gap: calc(var(--space) * 1.5);
  }

  table {
    font-size: 1rem;
  }
}

@media (min-width: 1024px) {
  main {
    grid-template-columns: 1fr 320px;
    gap: calc(var(--space) * 3);
  }

  main > article:first-child,
  main > section:first-child {
    grid-column: 1 / -1;
  }

  aside {
    grid-column: 2;
  }

  thead th {
    position: sticky;
    top: 0;
    z-index: 10;
    background-color: var(--color-primary);
  }

  p {
    max-width: 75ch;
  }
}

button, .button {
  background-color: var(--color-primary);
  color: var(--color-surface);
  border: none;
  padding: calc(var(--space) * 0.75) calc(var(--space) * 1.5);
  border-radius: calc(var(--radius) * 0.5);
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.2s ease;
  text-decoration: none;
  display: inline-block;
}

button:hover, .button:hover {
  background-color: var(--color-secondary);
  transform: translateY(-1px);
}

button:focus-visible, .button:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

button:active, .button:active {
  transform: translateY(0);
}

@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;
  }

  html {
    scroll-behavior: auto;
  }

  summary::before {
    transition: none;
  }

  details {
    transition: none;
  }

  a, button, .button, nav a, tbody tr {
    transition: none;
  }
}

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

  header, footer, nav, aside {
    display: none;
  }

  main {
    display: block;
    max-width: 100%;
    padding: 0;
  }

  article, section {
    box-shadow: none;
    page-break-inside: avoid;
  }

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

  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
  }

  table {
    page-break-inside: avoid;
  }

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

*:focus:not(:focus-visible) {
  outline: none;
}

*:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}