:root {
  --color-primary: #1F3A5F;
  --color-secondary: #8B2E3C;
  --color-accent: #D6A21E;
  --color-background: #F6F1E7;
  --color-surface: #FFFFFF;
  --color-text: #1A1A1A;
  --color-text-muted: #5B5B5B;
  --color-border: #D7D0C6;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(31, 58, 95, 0.12);
  --maxw: 1100px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1 {
  font-size: clamp(2rem, 1.5rem + 2vw, 3rem);
  line-height: 1.2;
  color: var(--color-primary);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.5rem, 1.25rem + 1vw, 2rem);
  line-height: 1.3;
  color: var(--color-primary);
  font-weight: 600;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(1.25rem, 1.1rem + 0.5vw, 1.5rem);
  line-height: 1.4;
  color: var(--color-secondary);
  font-weight: 600;
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
}

p {
  margin-bottom: var(--spacing-sm);
}

a {
  color: var(--color-secondary);
  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-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: 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: var(--spacing-md) var(--spacing-sm);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

header .site-name {
  font-size: clamp(1.5rem, 1.25rem + 1vw, 2rem);
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: -0.01em;
}

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

nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm) var(--spacing-md);
}

nav a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  padding: var(--spacing-xs) 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

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

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

.breadcrumbs {
  margin-bottom: var(--spacing-md);
  font-size: 0.9rem;
}

.breadcrumbs ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  align-items: center;
}

.breadcrumbs li:not(:last-child)::after {
  content: "›";
  margin-left: var(--spacing-xs);
  color: var(--color-text-muted);
}

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

.breadcrumbs a:hover {
  text-decoration: underline;
}

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-sm);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

article,
section {
  margin-bottom: var(--spacing-lg);
}

aside {
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius);
  padding: var(--spacing-md);
  box-shadow: var(--shadow);
}

aside h2,
aside h3 {
  font-size: clamp(1.125rem, 1rem + 0.5vw, 1.375rem);
  margin-top: 0;
  color: var(--color-primary);
}

aside ul {
  list-style: none;
  margin-top: var(--spacing-sm);
}

aside li {
  margin-bottom: var(--spacing-xs);
  padding-left: var(--spacing-sm);
  position: relative;
}

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

blockquote {
  background-color: var(--color-surface);
  border-left: 5px solid var(--color-accent);
  border-radius: var(--radius);
  padding: var(--spacing-md);
  margin: var(--spacing-md) 0;
  font-style: italic;
  color: var(--color-text-muted);
  box-shadow: 0 4px 12px rgba(31, 58, 95, 0.08);
}

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

table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-md) 0;
  background-color: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

caption {
  text-align: left;
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-primary);
  padding: var(--spacing-sm);
  background-color: var(--color-surface);
  border-bottom: 2px solid var(--color-accent);
  position: sticky;
  top: 0;
}

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

th {
  text-align: left;
  padding: var(--spacing-sm);
  font-weight: 600;
}

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

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

tbody tr:nth-child(even) {
  background-color: rgba(31, 58, 95, 0.03);
}

tbody tr:hover {
  background-color: rgba(214, 162, 30, 0.1);
}

details {
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  transition: border-color 0.3s ease;
}

details[open] {
  border-left: 4px solid var(--color-accent);
  box-shadow: var(--shadow);
}

summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--color-primary);
  padding: var(--spacing-xs);
  list-style: none;
  display: flex;
  align-items: center;
  transition: color 0.2s ease;
  user-select: none;
}

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

summary::before {
  content: "▸";
  display: inline-block;
  margin-right: var(--spacing-xs);
  color: var(--color-accent);
  font-size: 1.2em;
  transition: transform 0.3s ease;
}

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

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

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

details > *:not(summary) {
  margin-top: var(--spacing-sm);
  padding-left: calc(1.2em + var(--spacing-xs));
}

ul,
ol {
  margin-left: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
}

li {
  margin-bottom: var(--spacing-xs);
}

strong {
  font-weight: 600;
  color: var(--color-primary);
}

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

footer {
  background-color: var(--color-primary);
  color: var(--color-surface);
  padding: var(--spacing-lg) var(--spacing-sm);
  margin-top: var(--spacing-xl);
  border-top: 4px solid var(--color-accent);
}

footer .footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  align-items: center;
  text-align: center;
}

footer a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

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

footer p {
  margin: 0;
}

button,
input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}

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

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

  main {
    grid-template-columns: 1fr 320px;
    gap: var(--spacing-xl);
    padding: var(--spacing-xl) var(--spacing-md);
  }

  aside {
    position: sticky;
    top: calc(80px + var(--spacing-md));
    align-self: start;
  }

  footer .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

@media (min-width: 1024px) {
  main {
    padding: var(--spacing-xl) var(--spacing-lg);
    gap: calc(var(--spacing-xl) * 1.5);
  }

  aside {
    padding: var(--spacing-lg);
  }

  table {
    font-size: 1rem;
  }
}

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

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

  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
  }

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

  main {
    max-width: 100%;
    padding: 0;
    grid-template-columns: 1fr;
  }

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

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

  details[open] summary {
    display: none;
  }

  details > *:not(summary) {
    display: block;
  }
}