:root {
  --color-bg: #F6F2EA;
  --color-surface: #FFFFFF;
  --color-text: #1A1D21;
  --color-muted: #4F5B66;
  --color-border: #D7D0C6;
  --color-primary: #1E4D6B;
  --color-secondary: #D9A441;
  --color-accent: #C84D3A;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(26, 29, 33, 0.10);
  --maxw: 72rem;
  --transition-speed: 0.25s;
}

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

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  font-size: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  grid-template-columns: 100%;
}

h1 {
  font-size: clamp(2rem, 1.5rem + 2vw, 3rem);
  line-height: 1.1;
  margin-bottom: 1rem;
  color: var(--color-primary);
  font-weight: 700;
}

h2 {
  font-size: clamp(1.5rem, 1.25rem + 1vw, 2.25rem);
  line-height: 1.2;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  color: var(--color-primary);
  font-weight: 700;
}

h3 {
  font-size: clamp(1.25rem, 1.1rem + 0.5vw, 1.75rem);
  line-height: 1.3;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--color-text);
  font-weight: 600;
}

h4 {
  font-size: clamp(1.125rem, 1rem + 0.25vw, 1.375rem);
  line-height: 1.4;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--color-text);
  font-weight: 600;
}

p {
  margin-bottom: 1rem;
  max-width: 70ch;
}

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

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

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

header {
  background-color: var(--color-surface);
  border-bottom: 2px solid var(--color-border);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

header .header-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

header .site-name {
  font-size: clamp(1.5rem, 1.25rem + 0.75vw, 2rem);
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

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

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

nav a {
  text-decoration: none;
  font-weight: 500;
  color: var(--color-text);
  transition: color var(--transition-speed) ease;
}

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

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

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

nav[aria-label="Breadcrumb"] ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  max-width: var(--maxw);
  margin: 0 auto;
  font-size: 0.9rem;
}

nav[aria-label="Breadcrumb"] li + li::before {
  content: "›";
  margin-right: 0.5rem;
  color: var(--color-muted);
}

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

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

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2rem 1.5rem;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

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

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

aside h3, aside h4 {
  margin-top: 0;
  color: var(--color-secondary);
}

blockquote {
  border-left: 5px solid var(--color-secondary);
  padding-left: 1.5rem;
  margin: 2rem 0;
  font-style: italic;
  color: var(--color-muted);
  font-size: 1.125rem;
  line-height: 1.7;
}

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

table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  background-color: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  font-size: 0.95rem;
}

caption {
  font-weight: 700;
  font-size: 1.125rem;
  text-align: left;
  padding: 1rem;
  background-color: var(--color-primary);
  color: var(--color-surface);
  caption-side: top;
}

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

th {
  padding: 1rem;
  text-align: left;
  font-weight: 600;
}

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

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

tbody tr:hover {
  background-color: rgba(217, 164, 65, 0.1);
  transition: background-color var(--transition-speed) ease;
}

details {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem;
  margin-bottom: 1rem;
  box-shadow: 0 2px 8px rgba(26, 29, 33, 0.05);
}

summary {
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
  padding: 0.5rem;
  margin: -0.5rem;
  border-radius: calc(var(--radius) - 2px);
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
  list-style: none;
  display: flex;
  align-items: center;
}

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

summary::before {
  content: "▸";
  display: inline-block;
  margin-right: 0.75rem;
  transition: transform var(--transition-speed) ease;
  color: var(--color-secondary);
  font-size: 1.25rem;
}

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

summary:hover {
  background-color: rgba(30, 77, 107, 0.05);
  color: var(--color-accent);
}

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

details[open] {
  border-color: var(--color-secondary);
  box-shadow: 0 4px 12px rgba(26, 29, 33, 0.08);
}

details[open] summary {
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
}

details p {
  margin-top: 0.75rem;
}

footer {
  background-color: var(--color-primary);
  color: var(--color-surface);
  padding: 2rem 1.5rem;
  margin-top: 3rem;
  text-align: center;
  border-top: 3px solid var(--color-secondary);
}

footer p {
  max-width: none;
  margin: 0;
}

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

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

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

li {
  margin-bottom: 0.5rem;
}

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

  main {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  section, article {
    padding: 2.5rem;
  }

  table {
    font-size: 1rem;
  }

  thead {
    position: sticky;
    top: 0;
    z-index: 10;
  }
}

@media (min-width: 1024px) {
  main {
    padding: 3rem 2rem;
  }

  section, article {
    padding: 3rem;
  }

  aside {
    padding: 2rem;
  }
}

*: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;
  }
}

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

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

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

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

  a::after {
    content: " (" attr(href) ")";
    font-size: 0.85em;
    color: #666;
  }

  table {
    page-break-inside: avoid;
    border: 1px solid black;
  }

  thead {
    display: table-header-group;
  }

  tr {
    page-break-inside: avoid;
  }

  details {
    border: 1px solid black;
  }

  summary::before {
    content: "";
  }

  details[open] summary {
    font-weight: bold;
  }
}