:root {
  --color-primary: #1E4D6B;
  --color-secondary: #2F7A6D;
  --color-accent: #C46A2B;
  --color-background: #F6F4EF;
  --color-surface: #FFFFFF;
  --color-text: #14212B;
  --color-text-muted: #4E5C66;
  --color-border: #D6D2C8;
  --radius: 2px;
  --shadow: 0 2px 8px rgba(20, 33, 43, 0.08);
  --space: 1.5rem;
  --maxw: 1200px;
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

html {
  font-size: 100%;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-stack);
  background-color: var(--color-background);
  color: var(--color-text);
  font-size: 1rem;
  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-weight: 700;
  line-height: 1.2;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

h1 {
  font-size: 2.25rem;
  margin-bottom: 1.5rem;
  color: var(--color-primary);
}

h2 {
  font-size: 1.75rem;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  color: var(--color-primary);
}

h3 {
  font-size: 1.375rem;
  margin-top: 2rem;
  margin-bottom: 0.875rem;
}

h4 {
  font-size: 1.125rem;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

p {
  margin-bottom: 1rem;
}

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

header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space) 0;
  box-shadow: var(--shadow);
}

header .container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--space);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

header .site-name {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: -0.03em;
}

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

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

nav a {
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

nav a:hover {
  text-decoration: underline;
}

.breadcrumbs {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 0.75rem var(--space);
}

.breadcrumbs .container {
  max-width: var(--maxw);
  margin: 0 auto;
}

.breadcrumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.875rem;
}

.breadcrumbs li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumbs li:not(:last-child)::after {
  content: "›";
  color: var(--color-text-muted);
  font-weight: 400;
}

.breadcrumbs a {
  color: var(--color-text-muted);
}

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

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 3rem var(--space);
  width: 100%;
}

section {
  margin-bottom: 3rem;
}

aside {
  background-color: var(--color-surface);
  border-left: 4px solid var(--color-accent);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  box-shadow: var(--shadow);
}

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

blockquote {
  background-color: var(--color-surface);
  border-left: 4px solid var(--color-secondary);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--color-text-muted);
}

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

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  background-color: var(--color-surface);
  box-shadow: var(--shadow);
  font-size: 0.9375rem;
}

caption {
  text-align: left;
  font-weight: 700;
  padding: 1rem;
  background-color: var(--color-primary);
  color: var(--color-surface);
  font-size: 1rem;
  letter-spacing: -0.01em;
}

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

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

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

tbody tr:hover {
  background-color: rgba(30, 77, 107, 0.04);
  transition: background-color 0.2s ease;
}

details {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0;
  margin-bottom: 1rem;
  box-shadow: var(--shadow);
  transition: border-color 0.2s ease;
}

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

summary {
  font-weight: 600;
  padding: 1rem 1.25rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transition: background-color 0.2s ease;
  user-select: none;
}

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

summary::before {
  content: "▸";
  color: var(--color-accent);
  font-size: 1.125rem;
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

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

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

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

details .details-content {
  padding: 0 1.25rem 1.25rem 2.875rem;
  color: var(--color-text);
}

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

footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 2rem var(--space);
  margin-top: 3rem;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

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

ul, ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.5rem;
}

@media (min-width: 768px) {
  h1 {
    font-size: 3rem;
  }
  
  h2 {
    font-size: 2.25rem;
  }
  
  h3 {
    font-size: 1.625rem;
  }
  
  header .container {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
  
  header .site-name {
    font-size: 1.75rem;
  }
  
  nav ul {
    gap: 2rem;
  }
  
  main {
    padding: 4rem var(--space);
  }
  
  table {
    font-size: 1rem;
  }
}

@media (min-width: 1024px) {
  :root {
    --space: 2rem;
  }
  
  h1 {
    font-size: 3.5rem;
  }
  
  h2 {
    font-size: 2.5rem;
  }
  
  main {
    padding: 5rem var(--space);
  }
}

@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;
  }
  
  summary::before {
    transition: none;
  }
}

@media print {
  body {
    background-color: white;
    color: black;
  }
  
  header,
  nav,
  footer,
  .breadcrumbs {
    display: none;
  }
  
  main {
    max-width: 100%;
    padding: 0;
  }
  
  a {
    color: black;
    text-decoration: underline;
  }
  
  details {
    border: 1px solid #000;
  }
  
  details summary::before {
    content: "";
  }
  
  details .details-content {
    display: block;
  }
  
  table {
    page-break-inside: avoid;
  }
  
  h1, h2, h3 {
    page-break-after: avoid;
  }
}

button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.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;
}