:root {
  --color-bg: #F6F3EE;
  --color-surface: #FFFFFF;
  --color-text: #12161A;
  --color-muted: #4D5A63;
  --color-border: #D7D2C8;
  --color-primary: #1F4B8F;
  --color-secondary: #0E2A3B;
  --color-accent: #E06A2B;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(14, 42, 59, 0.10);
  --maxw: 1120px;
}

* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  margin: 0;
  padding: 0;
}

@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;
  }
}

body {
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100vh;
  gap: 2rem;
}

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

nav {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 2rem;
}

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

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

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

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

.breadcrumbs {
  margin-bottom: 2rem;
  color: var(--color-muted);
  font-size: 0.9rem;
}

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

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

article {
  background-color: var(--color-surface);
  border-radius: var(--radius);
  padding: 3rem;
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 2rem 0;
  color: var(--color-secondary);
  text-align: left;
}

h2 {
  font-size: 1.75rem;
  font-weight: 600;
  line-height: 1.3;
  margin: 3rem 0 1.5rem 0;
  color: var(--color-secondary);
  text-align: left;
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.4;
  margin: 2rem 0 1rem 0;
  color: var(--color-text);
}

p {
  margin: 0 0 1.5rem 0;
  max-width: 70ch;
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  transition: color 0.2s ease;
}

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

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

a[rel="external"]::after {
  content: " ↗";
  font-size: 0.8em;
  color: var(--color-muted);
}

blockquote {
  background-color: var(--color-bg);
  border-left: 4px solid var(--color-primary);
  margin: 2rem 0;
  padding: 1.5rem 2rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-style: italic;
  color: var(--color-secondary);
}

blockquote p {
  margin: 0;
}

aside {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 2rem 0;
}

aside h3 {
  margin-top: 0;
  color: var(--color-primary);
}

dl {
  margin: 0;
}

dt {
  font-weight: 600;
  color: var(--color-text);
  margin-top: 1rem;
}

dt:first-child {
  margin-top: 0;
}

dd {
  margin: 0.5rem 0 0 1rem;
  color: var(--color-muted);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  background-color: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(14, 42, 59, 0.05);
}

caption {
  font-weight: 600;
  color: var(--color-secondary);
  text-align: left;
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

th, td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

th {
  background-color: var(--color-bg);
  font-weight: 600;
  color: var(--color-secondary);
}

tbody tr:nth-child(even) {
  background-color: rgba(246, 243, 238, 0.3);
}

tbody tr:hover {
  background-color: rgba(31, 75, 143, 0.05);
}

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

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

details[open] {
  border-color: var(--color-primary);
  background-color: rgba(31, 75, 143, 0.02);
}

summary {
  padding: 1.5rem;
  font-weight: 600;
  color: var(--color-secondary);
  cursor: pointer;
  transition: color 0.2s ease;
  border-radius: var(--radius);
}

summary:hover {
  color: var(--color-primary);
  background-color: rgba(31, 75, 143, 0.05);
}

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

details div {
  padding: 0 1.5rem 1.5rem 1.5rem;
  border-top: 1px solid var(--color-border);
}

details[open] div {
  animation: slideDown 0.2s ease;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

section {
  margin: 3rem 0;
}

section:first-child {
  margin-top: 0;
}

footer {
  background-color: var(--color-secondary);
  color: var(--color-surface);
  text-align: center;
  padding: 2rem 1.5rem;
  margin-top: auto;
}

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

@media (max-width: 768px) {
  nav {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
  
  nav ul {
    gap: 1rem;
  }
  
  article {
    padding: 2rem 1.5rem;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  table {
    font-size: 0.9rem;
  }
  
  th, td {
    padding: 0.75rem 0.5rem;
  }
}

@media (max-width: 480px) {
  main {
    padding: 0 1rem;
  }
  
  article {
    padding: 1.5rem 1rem;
  }
  
  h1 {
    font-size: 1.75rem;
  }
  
  nav ul {
    flex-direction: column;
    gap: 0.5rem;
  }
}