:root {
  --color-primary: #2E3A59;
  --color-secondary: #5B6B8A;
  --color-accent: #B88A3B;
  --color-background: #F6F2EA;
  --color-surface: #FFFFFF;
  --color-text: #1B1F2A;
  --color-text-muted: #5A6475;
  --color-border: #D8D0C3;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(27, 31, 42, 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: 100%;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-background);
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: auto 1fr auto;
  grid-template-areas:
    "header"
    "main"
    "footer";
}

header {
  grid-area: header;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: calc(var(--space) * 1.5) var(--space);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

header .header-container {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space);
  align-items: flex-start;
}

header .site-name {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

header .site-name:hover {
  color: var(--color-accent);
  transition: color 0.2s ease;
}

nav {
  width: 100%;
}

nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--space) * 1.5);
  align-items: center;
}

nav a {
  color: var(--color-secondary);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 500;
  padding: 0.5rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

nav a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-accent);
}

nav a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
  border-radius: 2px;
}

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

aside {
  background-color: var(--color-surface);
  padding: calc(var(--space) * 1.5);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

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) * 3);
  text-align: center;
  font-size: 0.9rem;
}

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

footer a:hover {
  color: var(--color-accent);
  transition: color 0.2s ease;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.1;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: calc(var(--space) * 1.5);
  letter-spacing: -0.03em;
  max-width: 30ch;
}

h2 {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  line-height: 1.2;
  font-weight: 700;
  color: var(--color-primary);
  margin-top: calc(var(--space) * 2.5);
  margin-bottom: var(--space);
  letter-spacing: -0.02em;
}

h3 {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  line-height: 1.3;
  font-weight: 600;
  color: var(--color-secondary);
  margin-top: calc(var(--space) * 2);
  margin-bottom: calc(var(--space) * 0.75);
}

h4 {
  font-size: clamp(1.125rem, 2.5vw, 1.375rem);
  line-height: 1.4;
  font-weight: 600;
  color: var(--color-secondary);
  margin-top: calc(var(--space) * 1.5);
  margin-bottom: calc(var(--space) * 0.5);
}

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

p.lead {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  line-height: 1.6;
  color: var(--color-secondary);
  margin-bottom: calc(var(--space) * 1.5);
  max-width: 60ch;
}

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

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

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

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

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: 400;
}

nav[aria-label="Breadcrumb"] a {
  color: var(--color-secondary);
  text-decoration: none;
}

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

nav[aria-label="Breadcrumb"] [aria-current="page"] {
  color: var(--color-text-muted);
  font-weight: 500;
}

.table-container {
  overflow-x: auto;
  margin: calc(var(--space) * 1.5) 0;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 1rem;
  min-width: 600px;
}

caption {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-primary);
  text-align: left;
  padding: calc(var(--space) * 1.25);
  background-color: var(--color-background);
  border-bottom: 2px solid var(--color-border);
}

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

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

tbody tr {
  border-bottom: 1px solid var(--color-border);
  transition: background-color 0.2s ease;
}

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

tbody tr:hover {
  background-color: rgba(184, 138, 59, 0.08);
}

tbody td {
  padding: calc(var(--space) * 0.875);
  vertical-align: top;
}

details {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: var(--space);
  overflow: hidden;
}

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

summary {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-primary);
  padding: calc(var(--space) * 1.25);
  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;
  font-weight: 700;
  color: var(--color-accent);
  transition: transform 0.3s ease;
}

details[open] summary::after {
  transform: rotate(45deg);
}

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

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

details .details-content {
  padding: 0 calc(var(--space) * 1.25) calc(var(--space) * 1.25);
  color: var(--color-text);
}

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

blockquote {
  border-left: 4px solid var(--color-accent);
  padding-left: calc(var(--space) * 1.5);
  margin: calc(var(--space) * 2) 0;
  font-style: italic;
  color: var(--color-text-muted);
  max-width: 65ch;
  background-color: var(--color-surface);
  padding: calc(var(--space) * 1.25);
  border-radius: 0 var(--radius) var(--radius) 0;
}

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

blockquote cite {
  display: block;
  font-style: normal;
  font-weight: 600;
  color: var(--color-secondary);
  margin-top: calc(var(--space) * 0.5);
  font-size: 0.95rem;
}

ul, ol {
  margin: var(--space) 0;
  padding-left: calc(var(--space) * 2);
  max-width: 65ch;
}

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

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

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: calc(var(--space) * 1.5);
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 40px rgba(27, 31, 42, 0.15);
}

.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: calc(var(--space) * 1.5);
  margin: calc(var(--space) * 2) 0;
}

button, .button {
  display: inline-block;
  padding: calc(var(--space) * 0.75) calc(var(--space) * 1.5);
  background-color: var(--color-accent);
  color: var(--color-surface);
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.2s ease;
  font-family: var(--font-system);
}

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

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

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

@media (min-width: 768px) {
  header .header-container {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }

  main {
    grid-template-columns: 1fr;
    gap: calc(var(--space) * 3);
  }

  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  body {
    font-size: 1.125rem;
  }
}

@media (min-width: 1024px) {
  main {
    grid-template-columns: 2fr 1fr;
    gap: calc(var(--space) * 3);
  }

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

  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  nav ul {
    gap: calc(var(--space) * 2);
  }
}

@media print {
  * {
    background: white !important;
    color: black !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }

  a, a:visited {
    text-decoration: underline;
  }

  a[href]::after {
    content: " (" attr(href) ")";
  }

  header, footer {
    border: 1px solid black;
  }

  nav[aria-label="Breadcrumb"] {
    display: none;
  }

  details {
    border: 1px solid black;
  }

  details summary::after {
    display: none;
  }

  details .details-content {
    display: block !important;
  }

  thead {
    display: table-header-group;
  }

  tr, img {
    page-break-inside: avoid;
  }

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

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

::selection {
  background-color: var(--color-accent);
  color: var(--color-surface);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
}

hr {
  border: none;
  border-top: 2px solid var(--color-border);
  margin: calc(var(--space) * 2) 0;
  max-width: 70ch;
}

code, pre {
  font-family: "Courier New", Courier, monospace;
  background-color: var(--color-background);
  padding: 0.2em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
}

pre {
  padding: var(--space);
  overflow-x: auto;
  border: 1px solid var(--color-border);
}

strong {
  font-weight: 700;
  color: var(--color-primary);
}

em {
  font-style: italic;
  color: var(--color-secondary);
}

small {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}