:root {
  --color-primary: #1E4B5E;
  --color-secondary: #2F6F5E;
  --color-accent: #C97B3A;
  --color-bg: #F6F2EA;
  --color-surface: #FFFFFF;
  --color-text: #14212B;
  --color-text-muted: #4B5A66;
  --color-border: #D7D0C6;
  --radius: 14px;
  --space: 1rem;
  --max-width: 72rem;
  --shadow: 0 10px 30px rgba(20, 33, 43, 0.10);
}

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

html {
  font-size: 18px;
  scroll-behavior: smooth;
}

body {
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, 'Noto Sans', 'Liberation Sans', sans-serif;
  line-height: 1.65;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: ui-serif, Georgia, 'Times New Roman', Times, serif;
  line-height: 1.2;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.75em;
}

h1 {
  font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
  margin-bottom: 1rem;
}

h2 {
  font-size: clamp(1.75rem, 3vw + 0.75rem, 2.75rem);
  margin-top: 2em;
}

h3 {
  font-size: clamp(1.35rem, 2vw + 0.5rem, 2rem);
  margin-top: 1.5em;
  color: var(--color-secondary);
}

h4 {
  font-size: clamp(1.15rem, 1.5vw + 0.5rem, 1.5rem);
  margin-top: 1.25em;
}

p {
  margin-bottom: 1.25em;
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  transition: color 160ms ease, text-decoration-thickness 160ms ease, text-decoration-color 160ms ease;
}

a:hover {
  color: var(--color-accent);
  text-decoration-thickness: 2px;
  text-decoration-color: var(--color-accent);
}

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

.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space);
  background: var(--color-accent);
  color: var(--color-surface);
  padding: 0.75rem 1.5rem;
  text-decoration: none;
  border-radius: var(--radius);
  font-weight: 600;
  z-index: 1000;
}

.skip-link:focus {
  top: var(--space);
}

body {
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: auto 1fr auto;
  grid-template-areas:
    "header"
    "main"
    "footer";
  min-height: 100vh;
}

header {
  grid-area: 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-header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

header .site-name {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  margin-bottom: 0.5rem;
  color: var(--color-primary);
}

header nav {
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--space) * 1.25);
  margin-top: calc(var(--space) * 0.75);
}

header nav a {
  font-weight: 500;
  white-space: nowrap;
}

main {
  grid-area: main;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: calc(var(--space) * 2) var(--space);
}

@media (min-width: 1024px) {
  main {
    display: grid;
    grid-template-columns: 1fr minmax(280px, 360px);
    gap: calc(var(--space) * 3);
    align-items: start;
  }

  main > article {
    max-width: 42rem;
  }

  main > aside {
    position: sticky;
    top: calc(var(--space) * 2);
  }
}

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

@media (min-width: 768px) {
  article {
    padding: calc(var(--space) * 2.5);
  }
}

aside {
  background-color: var(--color-surface);
  padding: calc(var(--space) * 1.5);
  border-radius: var(--radius);
  border: 2px solid var(--color-border);
  margin-top: calc(var(--space) * 2);
}

@media (min-width: 1024px) {
  aside {
    margin-top: 0;
  }
}

section {
  margin-top: calc(var(--space) * 3);
}

section:first-child {
  margin-top: 0;
}

nav[aria-label="Breadcrumb"] {
  margin-bottom: calc(var(--space) * 1.5);
  font-size: 0.9rem;
}

nav[aria-label="Breadcrumb"] ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
}

nav[aria-label="Breadcrumb"] li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

nav[aria-label="Breadcrumb"] li:not(:last-child)::after {
  content: "›";
  color: var(--color-text-muted);
  font-weight: 600;
}

nav[aria-label="Breadcrumb"] a {
  color: var(--color-text-muted);
}

nav[aria-label="Breadcrumb"] a:hover {
  color: var(--color-accent);
}

blockquote {
  margin: calc(var(--space) * 2) 0;
  padding: calc(var(--space) * 1.5) calc(var(--space) * 2);
  background-color: var(--color-bg);
  border-left: 5px solid var(--color-accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-family: ui-serif, Georgia, 'Times New Roman', Times, serif;
  font-size: 1.15rem;
  font-style: italic;
  color: var(--color-secondary);
  box-shadow: 0 4px 12px rgba(20, 33, 43, 0.06);
}

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

table {
  width: 100%;
  border-collapse: collapse;
  margin: calc(var(--space) * 2) 0;
  background-color: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(20, 33, 43, 0.08);
  font-size: 0.95rem;
}

caption {
  font-family: ui-serif, Georgia, 'Times New Roman', Times, serif;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  text-align: left;
  padding: calc(var(--space) * 1.25) var(--space);
  background-color: var(--color-bg);
  border-bottom: 2px solid var(--color-border);
}

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

@media (min-width: 768px) {
  thead {
    position: sticky;
    top: 0;
    z-index: 10;
  }
}

th {
  padding: calc(var(--space) * 0.875) var(--space);
  text-align: left;
  font-weight: 600;
  border-bottom: 2px solid var(--color-secondary);
}

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

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

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

tbody tr {
  transition: background-color 160ms ease;
}

tbody tr:hover {
  background-color: rgba(30, 75, 94, 0.06);
}

@media (max-width: 767px) {
  table {
    font-size: 0.85rem;
  }
  
  th, td {
    padding: calc(var(--space) * 0.625) calc(var(--space) * 0.75);
  }
}

details {
  margin: calc(var(--space) * 1.25) 0;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  background-color: var(--color-surface);
  overflow: hidden;
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

details:hover {
  border-color: var(--color-secondary);
}

details[open] {
  border-color: var(--color-primary);
  box-shadow: 0 4px 16px rgba(30, 75, 94, 0.12);
}

summary {
  padding: calc(var(--space) * 1.125) calc(var(--space) * 1.25);
  font-family: ui-serif, Georgia, 'Times New Roman', Times, serif;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space);
  background-color: var(--color-bg);
  transition: background-color 160ms ease, color 160ms ease;
  user-select: none;
}

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

summary::before {
  content: "▸";
  font-size: 1.25em;
  color: var(--color-accent);
  transition: transform 160ms ease;
  flex-shrink: 0;
}

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

summary:hover {
  background-color: rgba(30, 75, 94, 0.05);
  color: var(--color-secondary);
}

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

details[open] summary {
  border-bottom: 2px solid var(--color-border);
  background-color: var(--color-surface);
}

details > *:not(summary) {
  padding: calc(var(--space) * 1.25) calc(var(--space) * 1.25);
}

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

ul, ol {
  margin-bottom: 1.25em;
  padding-left: 1.75em;
}

li {
  margin-bottom: 0.5em;
}

footer {
  grid-area: footer;
  background-color: var(--color-primary);
  color: var(--color-surface);
  padding: calc(var(--space) * 2) var(--space);
  margin-top: calc(var(--space) * 4);
  border-top: 4px solid var(--color-accent);
}

footer .footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--space) * 1.5);
  margin-bottom: calc(var(--space) * 1.25);
}

footer a {
  color: var(--color-surface);
  text-decoration-color: rgba(255, 255, 255, 0.5);
}

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

footer p {
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.9rem;
  margin-bottom: 0;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

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

@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;
  }
}

@media print {
  body {
    background-color: white;
    color: black;
  }
  
  header, footer, nav, aside, .skip-link {
    display: none;
  }
  
  main {
    max-width: 100%;
    padding: 0;
  }
  
  article {
    box-shadow: none;
    padding: 0;
  }
  
  a {
    color: black;
    text-decoration: underline;
  }
  
  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.85em;
  }
  
  details {
    border: 1px solid #ccc;
  }
  
  details[open] summary {
    border-bottom: 1px solid #ccc;
  }
  
  summary::before {
    content: "";
  }
  
  table {
    page-break-inside: avoid;
  }
  
  thead {
    display: table-header-group;
  }
  
  tr {
    page-break-inside: avoid;
  }
}