:root {
  --color-primary: #1E3A8A;
  --color-secondary: #0F766E;
  --color-accent: #D97706;
  --color-bg: #F8FAFC;
  --color-surface: #FFFFFF;
  --color-text: #0B1220;
  --color-muted: #475569;
  --color-border: #CBD5E1;
  --radius: 10px;
  --space: clamp(14px, 1.6vw, 18px);
  --measure: 68ch;
}

*,
*::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: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: clamp(16px, 1.8vw, 18px);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
}

.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space);
  background: var(--color-primary);
  color: var(--color-surface);
  padding: calc(var(--space) * 0.5) var(--space);
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  z-index: 1000;
}

.skip-link:focus {
  top: var(--space);
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

.site-header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space) calc(var(--space) * 1.5);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space);
}

.site-name {
  font-size: clamp(20px, 2.5vw, 26px);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.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-weight: 500;
  padding: calc(var(--space) * 0.25) 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease, 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: 3px solid var(--color-accent);
  outline-offset: 4px;
  border-radius: 2px;
}

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

.breadcrumbs ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5em;
}

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

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

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

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

.page-grid {
  max-width: 1200px;
  margin: 0 auto;
  padding: calc(var(--space) * 2) calc(var(--space) * 1.5);
  display: grid;
  grid-template-columns: 1fr;
  gap: calc(var(--space) * 2);
}

@media (min-width: 768px) {
  .page-grid {
    grid-template-columns: 1fr 280px;
  }
}

@media (min-width: 1024px) {
  .page-grid {
    grid-template-columns: 1fr 300px;
    gap: calc(var(--space) * 3);
  }
}

.main-content {
  max-width: var(--measure);
}

.main-content h1 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
  margin: 0 0 calc(var(--space) * 1.5) 0;
  letter-spacing: -0.02em;
}

.main-content h2 {
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text);
  margin: calc(var(--space) * 2.5) 0 calc(var(--space) * 1) 0;
  letter-spacing: -0.01em;
}

.main-content h3 {
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-text);
  margin: calc(var(--space) * 2) 0 calc(var(--space) * 0.75) 0;
}

.main-content p {
  margin: 0 0 calc(var(--space) * 1.25) 0;
}

.main-content 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;
}

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

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

blockquote {
  margin: calc(var(--space) * 1.5) 0;
  padding: calc(var(--space) * 1.25) calc(var(--space) * 1.5);
  background-color: var(--color-surface);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-style: italic;
  color: var(--color-text);
}

blockquote p {
  margin: 0;
}

.checklist-aside,
.privacy-aside {
  margin: calc(var(--space) * 1.5) 0;
  padding: calc(var(--space) * 1.25);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.checklist-aside h3,
.privacy-aside h3 {
  margin-top: 0;
  font-size: 1.1em;
  color: var(--color-secondary);
}

.checklist-aside ul,
.privacy-aside ul {
  margin: 0;
  padding-left: 1.5em;
}

.checklist-aside li,
.privacy-aside li {
  margin-bottom: calc(var(--space) * 0.5);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: calc(var(--space) * 1.5) 0;
  background-color: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

caption {
  padding: calc(var(--space) * 0.75) var(--space);
  font-weight: 600;
  text-align: left;
  background-color: var(--color-secondary);
  color: var(--color-surface);
}

thead {
  background-color: var(--color-primary);
  color: var(--color-surface);
}

@media (min-width: 1024px) {
  thead {
    position: sticky;
    top: 60px;
  }
}

th {
  padding: calc(var(--space) * 0.75) var(--space);
  text-align: left;
  font-weight: 600;
  font-size: 0.95em;
}

td {
  padding: calc(var(--space) * 0.75) var(--space);
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

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

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

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

summary {
  padding: calc(var(--space) * 1) calc(var(--space) * 1.25);
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: calc(var(--space) * 0.75);
  transition: background-color 0.2s ease;
}

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

summary::before {
  content: "+";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background-color: var(--color-primary);
  color: var(--color-surface);
  border-radius: 50%;
  font-size: 18px;
  font-weight: 700;
  flex-shrink: 0;
  transition: transform 0.2s ease, background-color 0.2s ease;
}

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

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

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

.answer {
  padding: 0 calc(var(--space) * 1.25) calc(var(--space) * 1.25);
  border-top: 1px solid var(--color-border);
}

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

.dos-donts-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space);
  margin: calc(var(--space) * 1.5) 0;
}

@media (min-width: 768px) {
  .dos-donts-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.dos,
.donts {
  padding: calc(var(--space) * 1.25);
  border-radius: var(--radius);
}

.dos {
  background-color: #ECFDF5;
  border: 1px solid #A7F3D0;
}

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

.donts {
  background-color: #FEF2F2;
  border: 1px solid #FECACA;
}

.donts h3 {
  color: #B91C1C;
  margin-top: 0;
}

.dos ul,
.donts ul {
  margin: 0;
  padding-left: 1.25em;
}

.dos li,
.donts li {
  margin-bottom: calc(var(--space) * 0.5);
}

.sidebar {
  align-self: start;
}

@media (min-width: 768px) {
  .sidebar {
    position: sticky;
    top: calc(60px + var(--space) * 2);
  }
}

.sidebar h2 {
  font-size: 1.1em;
  font-weight: 600;
  color: var(--color-secondary);
  margin: 0 0 var(--space) 0;
  padding-bottom: calc(var(--space) * 0.5);
  border-bottom: 2px solid var(--color-border);
}

.sidebar nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar nav li {
  margin-bottom: calc(var(--space) * 0.75);
}

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

.sidebar nav a:hover {
  color: var(--color-secondary);
  text-decoration: underline;
}

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

.sidebar p {
  font-size: 0.95em;
  color: var(--color-muted);
  margin: 0 0 calc(var(--space) * 0.5) 0;
}

.site-footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: calc(var(--space) * 1.5);
  text-align: center;
  color: var(--color-muted);
  font-size: 0.9em;
}

.site-footer p {
  margin: 0;
}

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

.faq-section {
  margin-top: calc(var(--space) * 1.5);
}

.verification-schedule,
.additional-guidance {
  margin-top: calc(var(--space) * 2.5);
}

@media (max-width: 767px) {
  table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  
  th,
  td {
    min-width: 140px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .main-nav a,
  summary,
  summary::before,
  .main-content a,
  .sidebar nav a {
    transition: none;
  }
}