:root {
  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Arial, "Noto Sans", "Liberation Sans", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --color-primary: #1E3A8A;
  --color-secondary: #0F766E;
  --color-accent: #F97316;
  --color-bg: #F8FAFC;
  --color-surface: #FFFFFF;
  --color-text: #0B1220;
  --color-muted: #475569;
  --color-border: #CBD5E1;
  --radius: 10px;
  --space: 16px;
  --shadow: 0 10px 30px rgba(11, 18, 32, 0.08);
}

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

html {
  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 {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
}

.container {
  width: 100%;
  max-width: 72rem;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space);
  padding-right: var(--space);
}

/* Site Header */
.site-header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space) 0;
}

.site-header .container {
  display: flex;
  flex-direction: column;
  gap: var(--space);
}

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

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

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

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

/* Main Navigation */
.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--space) * 1.5);
}

.main-nav a {
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.9375rem;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s 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: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

/* Main Content */
main {
  padding: calc(var(--space) * 2) 0 calc(var(--space) * 4);
}

/* Page Header */
.page-header {
  margin-bottom: calc(var(--space) * 2);
}

.page-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
  margin: 0;
  letter-spacing: -0.02em;
}

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

@media (min-width: 1024px) {
  .page-header h1 {
    font-size: 2.5rem;
  }
}

/* Headings */
h2 {
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--color-text);
  margin: calc(var(--space) * 2.5) 0 var(--space);
  letter-spacing: -0.01em;
}

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

h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
  margin: calc(var(--space) * 1.5) 0 calc(var(--space) * 0.75);
}

/* Paragraphs */
p {
  margin: 0 0 var(--space);
  color: var(--color-text);
}

/* Links */
a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  transition: color 0.2s ease;
}

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

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

/* Lists */
ul, ol {
  margin: 0 0 var(--space);
  padding-left: calc(var(--space) * 1.5);
}

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

/* Sections */
section, aside {
  margin-bottom: calc(var(--space) * 2);
}

aside {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: calc(var(--space) * 1.5);
  box-shadow: var(--shadow);
}

aside h2 {
  margin-top: 0;
}

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

.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-muted);
  text-decoration: none;
}

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

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

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

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

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

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

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

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

tbody tr:hover {
  background-color: rgba(30, 58, 138, 0.04);
}

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

/* FAQ Accordions */
details {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: var(--space);
  transition: border-color 0.2s ease;
}

details:hover {
  border-color: var(--color-primary);
}

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

summary {
  padding: var(--space);
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space);
  transition: color 0.2s ease, background-color 0.2s ease;
}

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

summary::before {
  content: "+";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  flex-shrink: 0;
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--color-primary);
  background-color: var(--color-bg);
  border-radius: 4px;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

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

summary:hover {
  color: var(--color-primary);
  background-color: var(--color-bg);
}

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

.faq-answer {
  padding: 0 var(--space) var(--space) calc(var(--space) + 1.5rem + var(--space));
  color: var(--color-text);
}

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

/* Blockquotes */
blockquote {
  margin: var(--space) 0 calc(var(--space) * 1.5);
  padding: var(--space) calc(var(--space) * 1.5);
  background-color: var(--color-surface);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--color-text);
}

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

/* Visually Hidden */
.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;
}

/* Site Footer */
.site-footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: calc(var(--space) * 1.5) 0;
  margin-top: calc(var(--space) * 2);
}

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

/* Grid Layout for larger screens */
@media (min-width: 1024px) {
  article {
    display: grid;
    grid-template-columns: 1fr;
    gap: calc(var(--space) * 2);
  }
}

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

/* Print styles */
@media print {
  .site-header,
  .site-footer,
  .breadcrumbs {
    display: none;
  }
  
  body {
    font-size: 12pt;
    line-height: 1.5;
    color: #000;
    background: #fff;
  }
  
  a {
    color: #000;
    text-decoration: underline;
  }
  
  .table-wrapper {
    overflow: visible;
  }
}