:root {
  --color-primary: #1A4D8F;
  --color-secondary: #0F2E4A;
  --color-accent: #D14B2A;
  --color-bg: #F6F4EF;
  --color-surface: #FFFFFF;
  --color-text: #111827;
  --color-text-muted: #4B5563;
  --color-border: #D1D5DB;
  --radius: 14px;
  --space: 1rem;
  --max-width: 72rem;
  --shadow: 0 10px 30px rgba(15, 46, 74, 0.10);
}

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

* {
  margin: 0;
  padding: 0;
}

html {
  font-size: 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: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space);
}

.site-header {
  background-color: var(--color-secondary);
  padding-block: var(--space);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space);
}

.site-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-surface);
  text-decoration: none;
  letter-spacing: -0.02em;
}

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

.site-name:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
}

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

.main-nav a {
  color: var(--color-surface);
  text-decoration: none;
  font-weight: 500;
  padding-block: 0.25rem;
  position: relative;
  transition: color 0.2s ease;
}

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

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

.main-nav a[aria-current="page"] {
  color: var(--color-accent);
}

.site-main {
  padding-block: calc(var(--space) * 3);
}

.main-grid {
  display: grid;
  gap: calc(var(--space) * 2);
}

@media (min-width: 1024px) {
  .main-grid {
    grid-template-columns: 1fr 280px;
  }
  
  .info-aside {
    position: sticky;
    top: calc(var(--space) * 5);
    align-self: start;
  }
}

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

@media (min-width: 768px) {
  .content-article {
    padding: calc(var(--space) * 3);
  }
}

.article-header {
  margin-bottom: calc(var(--space) * 2);
  padding-bottom: calc(var(--space) * 1.5);
  border-bottom: 2px solid var(--color-border);
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-secondary);
  letter-spacing: -0.03em;
}

h2 {
  font-size: clamp(1.375rem, 3vw, 1.75rem);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-secondary);
  margin-top: calc(var(--space) * 2.5);
  margin-bottom: var(--space);
  letter-spacing: -0.02em;
}

h3 {
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-primary);
  margin-top: calc(var(--space) * 1.5);
  margin-bottom: calc(var(--space) * 0.75);
}

p {
  margin-bottom: var(--space);
  text-align: left;
}

.lead {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  margin-bottom: calc(var(--space) * 1.5);
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  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;
}

ul,
ol {
  margin-bottom: var(--space);
  padding-left: calc(var(--space) * 1.5);
}

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

li::marker {
  color: var(--color-primary);
}

.checklist {
  list-style: none;
  padding-left: 0;
}

.checklist li {
  position: relative;
  padding-left: calc(var(--space) * 1.75);
}

.checklist li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 700;
}

.content-section {
  margin-bottom: calc(var(--space) * 2);
}

.info-aside {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  padding: calc(var(--space) * 1.5);
  border-radius: var(--radius);
  margin-top: calc(var(--space) * 2);
}

@media (min-width: 1024px) {
  .info-aside {
    margin-top: 0;
    background-color: var(--color-surface);
  }
}

.info-aside h3 {
  margin-top: 0;
  color: var(--color-secondary);
}

.info-aside ol {
  margin-bottom: 0;
}

.table-wrapper {
  overflow-x: auto;
  margin-block: calc(var(--space) * 1.5);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--color-surface);
  font-size: 0.9375rem;
}

caption {
  padding: var(--space);
  font-weight: 700;
  text-align: left;
  background-color: var(--color-secondary);
  color: var(--color-surface);
}

th,
td {
  padding: calc(var(--space) * 0.75) var(--space);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

th {
  background-color: var(--color-primary);
  color: var(--color-surface);
  font-weight: 600;
  position: sticky;
  top: 0;
}

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

tbody tr:hover {
  background-color: rgba(26, 77, 143, 0.08);
}

@media (prefers-reduced-motion: no-preference) {
  tbody tr {
    transition: background-color 0.15s ease;
  }
}

blockquote {
  border-left: 4px solid var(--color-accent);
  padding: calc(var(--space) * 1.25);
  padding-left: calc(var(--space) * 1.5);
  margin-block: calc(var(--space) * 1.5);
  background-color: var(--color-bg);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 1.0625rem;
}

blockquote p {
  margin-bottom: 0;
  color: var(--color-secondary);
  font-weight: 500;
}

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

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.875rem;
}

.breadcrumbs li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
}

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

.breadcrumbs a {
  color: var(--color-primary);
}

.breadcrumbs span {
  color: var(--color-text-muted);
}

.accordion-group {
  display: flex;
  flex-direction: column;
  gap: var(--space);
}

.accordion-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background-color: var(--color-surface);
  overflow: hidden;
}

.accordion-item summary {
  padding: calc(var(--space) * 1.25);
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space);
  color: var(--color-secondary);
  transition: background-color 0.2s ease;
}

.accordion-item summary::-webkit-details-marker {
  display: none;
}

.accordion-item summary::before {
  content: "+";
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  flex-shrink: 0;
  background-color: var(--color-primary);
  color: var(--color-surface);
  border-radius: 50%;
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1;
}

.accordion-item[open] summary::before {
  content: "−";
  background-color: var(--color-accent);
}

.accordion-item summary:hover {
  background-color: var(--color-bg);
}

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

.accordion-item[open] summary {
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.accordion-content {
  padding: calc(var(--space) * 1.25);
}

.accordion-content p:last-child,
.accordion-content ul:last-child,
.accordion-content ol:last-child {
  margin-bottom: 0;
}

.card-grid {
  display: grid;
  gap: calc(var(--space) * 1.5);
  margin-block: calc(var(--space) * 1.5);
}

@media (min-width: 768px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

.card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

@media (prefers-reduced-motion: reduce) {
  .card:hover {
    transform: none;
  }
}

.card h3 {
  margin-top: 0;
  color: var(--color-secondary);
}

.card p {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

.card-link {
  display: inline-block;
  font-weight: 600;
  color: var(--color-primary);
}

.card-link:hover {
  color: var(--color-accent);
}

.faq-section {
  margin-bottom: calc(var(--space) * 2);
}

.faq-reference-section {
  margin-top: calc(var(--space) * 3);
  padding-top: calc(var(--space) * 2);
  border-top: 1px solid var(--color-border);
}

.navigation-section {
  margin-top: calc(var(--space) * 2);
  padding-top: calc(var(--space) * 1.5);
  border-top: 1px solid var(--color-border);
}

.site-footer {
  background-color: var(--color-secondary);
  color: var(--color-surface);
  padding-block: calc(var(--space) * 2);
  margin-top: auto;
}

.site-footer .container {
  text-align: center;
}

.site-footer p {
  margin: 0;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.8);
}

@media (min-width: 768px) {
  .container {
    padding-inline: calc(var(--space) * 2);
  }
}

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