:root {
  --color-primary: #1F3A5F;
  --color-secondary: #7A2E2A;
  --color-accent: #C9A227;
  --color-background: #F6F2EA;
  --color-surface: #FFFFFF;
  --color-text: #14161A;
  --color-text-muted: #4B5563;
  --color-border: #D7D0C4;
  --radius: 0.25rem;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.08);
  --space: 1rem;
  --maxw: 1200px;
  --font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: Georgia, "Times New Roman", Times, serif;
}

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

html {
  scroll-behavior: smooth;
  font-size: 100%;
}

body {
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-system);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--color-primary);
}

h1 {
  font-size: clamp(1.875rem, 4vw, 2.5rem);
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-top: 2.5rem;
  margin-bottom: 1.25rem;
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 0.5rem;
}

h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
  margin-top: 2rem;
  margin-bottom: 1rem;
}

p {
  margin-bottom: 1.25rem;
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
  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: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

header {
  background-color: var(--color-surface);
  border-bottom: 3px solid var(--color-primary);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

header .header-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.25rem var(--space);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.site-name {
  font-family: var(--font-system);
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.site-name:hover {
  color: var(--color-secondary);
}

nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  align-items: center;
}

nav a {
  font-family: var(--font-system);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--color-text);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  transition: background-color 0.2s ease, color 0.2s ease;
}

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

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

.breadcrumbs {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0.75rem var(--space);
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.breadcrumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-family: var(--font-system);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.breadcrumbs li:not(:last-child)::after {
  content: "›";
  margin-left: 0.5rem;
  color: var(--color-border);
}

.breadcrumbs a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.breadcrumbs a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2rem var(--space);
}

.page-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

article {
  background-color: var(--color-surface);
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

section {
  margin-bottom: 3rem;
}

section:last-child {
  margin-bottom: 0;
}

aside {
  background-color: var(--color-surface);
  padding: 1.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border-left: 4px solid var(--color-accent);
  align-self: start;
  position: sticky;
  top: 6rem;
}

aside h3 {
  font-size: 1.125rem;
  margin-top: 0;
  color: var(--color-secondary);
}

aside ul {
  list-style: none;
  padding-left: 0;
}

aside li {
  margin-bottom: 0.75rem;
  padding-left: 1.25rem;
  position: relative;
}

aside li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-size: 0.875rem;
}

aside a {
  font-family: var(--font-system);
  font-size: 0.9375rem;
}

blockquote {
  margin: 2rem 0;
  padding: 1.5rem;
  background-color: var(--color-background);
  border-left: 4px solid var(--color-accent);
  font-style: italic;
  color: var(--color-text);
  position: relative;
}

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

blockquote::before {
  content: """;
  font-size: 3rem;
  color: var(--color-accent);
  opacity: 0.3;
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  line-height: 1;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  font-family: var(--font-system);
  font-size: 0.9375rem;
}

caption {
  font-weight: 600;
  text-align: left;
  padding: 1rem;
  background-color: var(--color-primary);
  color: var(--color-surface);
  font-size: 1rem;
  letter-spacing: 0.01em;
}

thead {
  background-color: var(--color-background);
  border-bottom: 2px solid var(--color-border);
}

th {
  text-align: left;
  padding: 0.875rem 1rem;
  font-weight: 600;
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-border);
}

td {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--color-border);
}

tbody tr {
  transition: background-color 0.2s ease;
}

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

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

tbody tr:hover {
  background-color: #f0ede3;
}

tbody tr:last-child td {
  border-bottom: none;
}

details {
  margin: 1.5rem 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background-color: var(--color-surface);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

details[open] {
  border-color: var(--color-accent);
  background-color: var(--color-background);
}

summary {
  padding: 1rem 1.25rem;
  font-family: var(--font-system);
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color 0.2s ease, color 0.2s ease;
  user-select: none;
}

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

summary::after {
  content: "+";
  font-size: 1.5rem;
  color: var(--color-accent);
  font-weight: 400;
  transition: transform 0.2s ease;
  flex-shrink: 0;
  margin-left: 1rem;
}

details[open] summary::after {
  content: "−";
  transform: rotate(0deg);
}

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

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

details div {
  padding: 1rem 1.25rem 1.25rem;
  border-top: 1px solid var(--color-border);
}

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

ol, ul {
  margin-bottom: 1.25rem;
  padding-left: 2rem;
}

li {
  margin-bottom: 0.5rem;
}

ol ol, ol ul, ul ol, ul ul {
  margin-top: 0.5rem;
  margin-bottom: 0.5rem;
}

footer {
  background-color: var(--color-primary);
  color: var(--color-surface);
  margin-top: 4rem;
  border-top: 4px solid var(--color-secondary);
}

footer .footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2rem var(--space);
  text-align: center;
  font-family: var(--font-system);
  font-size: 0.875rem;
}

footer a {
  color: var(--color-accent);
  text-decoration: none;
}

footer a:hover {
  color: var(--color-surface);
  text-decoration: underline;
}

@media (min-width: 768px) {
  header .header-inner {
    padding: 1.5rem calc(var(--space) * 1.5);
  }

  main {
    padding: 3rem calc(var(--space) * 1.5);
  }

  article {
    padding: 2.5rem;
  }

  aside {
    padding: 2rem;
  }

  .breadcrumbs {
    padding: 0.75rem calc(var(--space) * 1.5);
  }

  footer .footer-inner {
    padding: 2.5rem calc(var(--space) * 1.5);
  }
}

@media (min-width: 1024px) {
  .page-layout {
    grid-template-columns: 1fr 320px;
    gap: 2.5rem;
  }

  .page-layout.full-width {
    grid-template-columns: 1fr;
  }

  article {
    padding: 3rem;
  }

  table {
    font-size: 1rem;
  }

  th, td {
    padding: 1rem 1.25rem;
  }
}

@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;
  }
}

@media print {
  * {
    background: transparent !important;
    color: #000 !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }

  a,
  a:visited {
    text-decoration: underline;
    color: #000 !important;
  }

  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.875rem;
  }

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

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

  article {
    box-shadow: none;
    padding: 0;
  }

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

  table, blockquote {
    page-break-inside: avoid;
  }

  img {
    max-width: 100% !important;
  }

  @page {
    margin: 2cm;
  }
}

.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: 2px solid var(--color-accent);
  outline-offset: 3px;
}