:root {
  --color-primary: #1E4B5A;
  --color-secondary: #6B7C6A;
  --color-accent: #C86B3C;
  --color-background: #F6F2EA;
  --color-surface: #FFFFFF;
  --color-text: #1A1D1F;
  --color-text-muted: #4E5A60;
  --color-border: #D7D0C4;
  --radius: 0.25rem;
  --shadow: 0 2px 8px rgba(30, 75, 90, 0.08);
  --space: 1rem;
  --maxw: 1200px;
}

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

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

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

header {
  background-color: var(--color-surface);
  border-bottom: 1px 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: calc(var(--space) * 1.25) var(--space);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space);
  align-items: center;
}

@media (min-width: 768px) {
  header .header-inner {
    grid-template-columns: auto 1fr;
    padding: calc(var(--space) * 1.5) calc(var(--space) * 1.5);
  }
}

header h1,
header .site-name {
  font-size: clamp(1.25rem, 1.1rem + 0.5vw, 1.75rem);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

header a {
  text-decoration: none;
  color: inherit;
}

nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--space) * 0.75);
  align-items: center;
}

@media (min-width: 768px) {
  nav ul {
    justify-content: flex-end;
    gap: calc(var(--space) * 1.5);
  }
}

nav a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  padding: calc(var(--space) * 0.5) calc(var(--space) * 0.75);
  border-radius: var(--radius);
  transition: color 0.2s ease, background-color 0.2s ease;
  display: inline-block;
}

nav a:hover {
  color: var(--color-primary);
  background-color: rgba(30, 75, 90, 0.05);
}

nav a:active {
  background-color: rgba(30, 75, 90, 0.1);
}

nav a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border: 1px solid var(--color-accent);
}

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

@media (min-width: 768px) {
  main {
    padding: calc(var(--space) * 3) calc(var(--space) * 1.5);
  }
}

@media (min-width: 1024px) {
  main {
    padding: calc(var(--space) * 4) calc(var(--space) * 2);
  }
}

article {
  background-color: var(--color-surface);
  padding: calc(var(--space) * 1.5);
  border-radius: calc(var(--radius) * 2);
  box-shadow: var(--shadow);
}

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

@media (min-width: 1024px) {
  article {
    padding: calc(var(--space) * 3);
  }
}

h1 {
  font-size: clamp(1.75rem, 1.5rem + 1vw, 2.5rem);
  line-height: 1.2;
  margin-bottom: calc(var(--space) * 1.5);
  color: var(--color-primary);
  font-weight: 800;
  letter-spacing: -0.03em;
}

h2 {
  font-size: clamp(1.5rem, 1.3rem + 0.75vw, 2rem);
  line-height: 1.3;
  margin-top: calc(var(--space) * 2.5);
  margin-bottom: calc(var(--space) * 1.25);
  color: var(--color-primary);
  font-weight: 700;
  letter-spacing: -0.02em;
}

h3 {
  font-size: clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);
  line-height: 1.4;
  margin-top: calc(var(--space) * 2);
  margin-bottom: var(--space);
  color: var(--color-secondary);
  font-weight: 600;
}

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

section:last-child {
  margin-bottom: 0;
}

p {
  margin-bottom: var(--space);
  max-width: 75ch;
}

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

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-accent);
  text-decoration-thickness: 2px;
}

a:active {
  color: var(--color-secondary);
}

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

.breadcrumbs {
  margin-bottom: calc(var(--space) * 1.5);
  font-size: 0.9rem;
}

.breadcrumbs nav {
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--space) * 0.5);
  align-items: center;
}

.breadcrumbs ol,
.breadcrumbs ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--space) * 0.5);
  align-items: center;
}

.breadcrumbs li {
  display: flex;
  align-items: center;
  gap: calc(var(--space) * 0.5);
}

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

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

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

blockquote {
  margin: calc(var(--space) * 2) 0;
  padding: calc(var(--space) * 1.5);
  border-left: 4px solid var(--color-accent);
  background-color: rgba(200, 107, 60, 0.04);
  font-style: italic;
  color: var(--color-text);
  border-radius: 0 var(--radius) var(--radius) 0;
}

blockquote p {
  margin-bottom: calc(var(--space) * 0.75);
}

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

aside {
  margin: calc(var(--space) * 2) 0;
  padding: calc(var(--space) * 1.5);
  background-color: rgba(107, 124, 106, 0.06);
  border: 1px solid var(--color-border);
  border-radius: calc(var(--radius) * 2);
  box-shadow: 0 1px 3px rgba(30, 75, 90, 0.05);
}

aside h2,
aside h3,
aside h4 {
  margin-top: 0;
}

ul,
ol {
  margin-bottom: var(--space);
  padding-left: calc(var(--space) * 2);
}

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

table {
  width: 100%;
  border-collapse: collapse;
  margin: calc(var(--space) * 2) 0;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  font-size: clamp(0.875rem, 0.85rem + 0.15vw, 1rem);
}

.table-wrapper {
  overflow-x: auto;
  margin: calc(var(--space) * 2) 0;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

caption {
  font-weight: 600;
  text-align: left;
  padding: var(--space);
  background-color: var(--color-primary);
  color: var(--color-surface);
  font-size: 1rem;
}

thead {
  background-color: rgba(30, 75, 90, 0.08);
}

@media (min-width: 1024px) {
  thead {
    position: sticky;
    top: 0;
    z-index: 10;
  }
}

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

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

tbody tr:nth-child(even) {
  background-color: rgba(246, 242, 234, 0.5);
}

tbody tr:hover {
  background-color: rgba(30, 75, 90, 0.04);
  transition: background-color 0.2s ease;
}

tbody tr:last-child td {
  border-bottom: none;
}

details {
  margin: calc(var(--space) * 1.5) 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background-color: var(--color-surface);
  overflow: hidden;
}

summary {
  padding: var(--space);
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  background-color: rgba(107, 124, 106, 0.06);
  border-bottom: 1px solid transparent;
  transition: background-color 0.2s ease, border-color 0.2s ease;
  list-style: none;
  display: flex;
  align-items: center;
  gap: calc(var(--space) * 0.5);
}

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

summary::before {
  content: "▸";
  display: inline-block;
  transition: transform 0.3s ease;
  color: var(--color-accent);
  font-size: 1.2em;
  line-height: 1;
}

@media (prefers-reduced-motion: reduce) {
  summary::before {
    transition: none;
  }
}

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

summary:hover {
  background-color: rgba(107, 124, 106, 0.1);
}

summary:active {
  background-color: rgba(107, 124, 106, 0.15);
}

summary:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
  border: 1px solid var(--color-accent);
}

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

details > *:not(summary) {
  padding: var(--space);
  opacity: 1;
  max-height: 5000px;
  transition: opacity 0.3s ease, max-height 0.3s ease;
}

@media (prefers-reduced-motion: reduce) {
  details > *:not(summary) {
    transition: none;
  }
}

details:not([open]) > *:not(summary) {
  max-height: 0;
  opacity: 0;
  padding: 0;
  overflow: hidden;
}

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(--maxw);
  margin: 0 auto;
  text-align: center;
}

@media (min-width: 768px) {
  footer .footer-inner {
    text-align: left;
  }
}

footer p {
  margin-bottom: calc(var(--space) * 0.5);
  color: rgba(255, 255, 255, 0.9);
}

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

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

footer a:focus-visible {
  outline-color: var(--color-accent);
}

@media print {
  * {
    background: white !important;
    color: black !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }
  
  a {
    text-decoration: underline;
  }
  
  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
  }
  
  header {
    position: static;
    box-shadow: none;
  }
  
  nav,
  aside,
  footer {
    display: none;
  }
  
  article,
  section {
    page-break-inside: avoid;
  }
  
  h1,
  h2,
  h3 {
    page-break-after: avoid;
  }
  
  table {
    border-collapse: collapse;
  }
  
  thead {
    display: table-header-group;
  }
  
  tr,
  img {
    page-break-inside: avoid;
  }
}

@media (min-width: 768px) {
  body {
    font-size: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  }
}

@media (min-width: 1024px) {
  body {
    font-size: 1.125rem;
  }
}

button,
.button,
a.button {
  display: inline-block;
  padding: calc(var(--space) * 0.75) calc(var(--space) * 1.5);
  background-color: var(--color-primary);
  color: var(--color-surface);
  text-decoration: none;
  border: none;
  border-radius: var(--radius);
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.1s ease;
  font-size: 1rem;
  font-family: inherit;
  text-align: center;
}

button:hover,
.button:hover,
a.button:hover {
  background-color: var(--color-accent);
  color: var(--color-surface);
  text-decoration: none;
}

button:active,
.button:active,
a.button:active {
  background-color: var(--color-secondary);
  transform: translateY(1px);
}

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

code,
pre {
  font-family: "Courier New", Courier, monospace;
  background-color: rgba(30, 75, 90, 0.05);
  padding: 0.125rem 0.375rem;
  border-radius: calc(var(--radius) * 0.5);
  font-size: 0.9em;
}

pre {
  padding: var(--space);
  overflow-x: auto;
  margin: calc(var(--space) * 1.5) 0;
}

pre code {
  background-color: transparent;
  padding: 0;
}

hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: calc(var(--space) * 2) 0;
}

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

figure {
  margin: calc(var(--space) * 2) 0;
}

figcaption {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-top: calc(var(--space) * 0.5);
  font-style: italic;
}

:focus {
  outline: 2px solid transparent;
}

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

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}