:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, monospace;
  --color-bg: #F8FAFC;
  --color-surface: #FFFFFF;
  --color-text: #0B1220;
  --color-muted: #475569;
  --color-border: #CBD5E1;
  --color-primary: #1E3A8A;
  --color-secondary: #0F766E;
  --color-accent: #D97706;
  --radius: 4px;
  --shadow: 0 1px 3px rgba(11, 18, 32, 0.1), 0 1px 2px rgba(11, 18, 32, 0.06);
  --baseline: 1.5rem;
  --transition-duration: 150ms;
}

@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;
  }
}

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

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

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Header */
.site-header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

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

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

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

.site-name:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 4px;
}

/* Navigation */
.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
}

.main-nav a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: color var(--transition-duration) ease, border-color var(--transition-duration) ease;
}

.main-nav a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

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

.main-nav a:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 4px;
}

/* Main content */
main {
  padding: 2rem 0;
}

/* Breadcrumbs */
.breadcrumbs {
  margin-bottom: 1.5rem;
}

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

.breadcrumbs li:not(:last-child)::after {
  content: "/";
  margin-left: 0.5rem;
  color: var(--color-border);
}

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

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

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

/* Page article */
.page-article {
  background-color: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
}

@media (min-width: 768px) {
  .page-article {
    padding: 2.5rem;
  }
}

@media (min-width: 1024px) {
  .page-article {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 2rem;
  }
  
  .page-header {
    grid-column: 1 / -1;
  }
  
  .content-section {
    grid-column: 1 / 10;
  }
  
  .faq-section,
  .documents-section,
  .additional-resources {
    grid-column: 1 / 10;
  }
  
  .intro-text {
    grid-column: 1 / -1;
  }
}

/* Typography */
.page-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

h1 {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.2;
  margin: 0;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

@media (min-width: 768px) {
  h1 {
    font-size: 2.25rem;
  }
}

h2 {
  font-size: 1.375rem;
  font-weight: 700;
  line-height: 1.3;
  margin: 2rem 0 1rem;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

@media (min-width: 768px) {
  h2 {
    font-size: 1.5rem;
  }
}

h3 {
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.4;
  margin: 1.5rem 0 0.75rem;
  color: var(--color-text);
}

p {
  margin: 0 0 1rem;
}

.intro-text {
  font-size: 1.0625rem;
  color: var(--color-muted);
  margin-bottom: 2rem;
}

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

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

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

/* Content sections */
.content-section {
  margin-bottom: 2.5rem;
}

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

/* Aside */
.info-aside,
.checklist-aside {
  background-color: var(--color-bg);
  border-left: 4px solid var(--color-secondary);
  padding: 1.25rem;
  margin: 1.5rem 0;
  border-radius: 0 var(--radius) var(--radius) 0;
}

@media (min-width: 1024px) {
  .info-aside,
  .checklist-aside {
    grid-column: 10 / -1;
    margin: 0;
    align-self: start;
  }
}

.info-aside h3,
.checklist-aside h3 {
  font-size: 1rem;
  margin: 0 0 0.75rem;
  color: var(--color-secondary);
}

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

.checklist li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.5rem;
  font-size: 0.9375rem;
}

.checklist li::before {
  content: "☐";
  position: absolute;
  left: 0;
  color: var(--color-secondary);
}

/* Blockquote */
blockquote,
.principle-quote {
  background-color: rgba(31, 58, 138, 0.04);
  border-left: 4px solid var(--color-accent);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
  border-radius: 0 var(--radius) var(--radius) 0;
}

blockquote p,
.principle-quote p {
  margin: 0;
  font-style: italic;
  color: var(--color-text);
}

/* Tables */
.table-wrapper {
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

caption {
  padding: 1rem;
  font-weight: 600;
  text-align: left;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

th,
td {
  padding: 0.875rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

th {
  background-color: var(--color-primary);
  color: var(--color-surface);
  font-weight: 600;
  white-space: nowrap;
}

@media (min-width: 768px) {
  th {
    position: sticky;
    top: 0;
  }
}

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

tbody tr:nth-child(odd) {
  background-color: var(--color-surface);
}

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

tbody tr:hover {
  background-color: rgba(15, 118, 110, 0.06);
}

/* FAQ Accordion */
.accordion-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

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

.faq-item:hover {
  border-color: var(--color-secondary);
}

.faq-item[open] {
  border-color: var(--color-primary);
}

.faq-item summary {
  display: flex;
  align-items: center;
  padding: 1rem 1.25rem;
  cursor: pointer;
  list-style: none;
  background-color: var(--color-bg);
  transition: background-color var(--transition-duration) ease;
}

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

.faq-item summary::before {
  content: "+";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  margin-right: 0.75rem;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-primary);
  background-color: var(--color-surface);
  border-radius: 50%;
  flex-shrink: 0;
  transition: transform var(--transition-duration) ease, background-color var(--transition-duration) ease;
}

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

.faq-item summary:hover {
  background-color: rgba(15, 118, 110, 0.06);
}

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

.faq-item summary h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
}

.faq-content {
  padding: 1rem 1.25rem 1.25rem;
  border-top: 1px solid var(--color-border);
}

.faq-content p:last-child {
  margin-bottom: 0;
}

/* Footer */
.site-footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 1.5rem 0;
  margin-top: 3rem;
}

.site-footer p {
  margin: 0;
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-muted);
}

/* Utility classes */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Focus styles for all interactive elements */
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* Print styles */
@media print {
  .site-header,
  .site-footer,
  .breadcrumbs {
    display: none;
  }
  
  .page-article {
    box-shadow: none;
    padding: 0;
  }
  
  a {
    color: var(--color-text);
  }
  
  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.875em;
    color: var(--color-muted);
  }
}