:root {
  --color-primary: #1F6F7A;
  --color-secondary: #2E3A59;
  --color-accent: #C86B3C;
  --color-bg: #F6F7F9;
  --color-surface: #FFFFFF;
  --color-text: #101828;
  --color-muted: #475467;
  --color-border: #D0D5DD;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(16, 24, 40, 0.10);
  --space: 1rem;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  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", Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  font-weight: 400;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space);
}

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

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

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

.site-name {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

nav {
  display: flex;
  gap: calc(var(--space) * 1.5);
  flex-wrap: wrap;
}

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

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

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

main {
  padding: calc(var(--space) * 3) 0;
}

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

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

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space);
  letter-spacing: -0.02em;
  color: var(--color-secondary);
}

h1 {
  font-size: 2rem;
  margin-bottom: calc(var(--space) * 1.5);
  color: var(--color-primary);
}

@media (min-width: 768px) {
  h1 {
    font-size: 2.5rem;
  }
}

h2 {
  font-size: 1.5rem;
  margin-top: calc(var(--space) * 2);
  padding-top: calc(var(--space) * 1.5);
  border-top: 1px solid var(--color-border);
}

h2:first-of-type {
  border-top: none;
  margin-top: 0;
  padding-top: 0;
}

h3 {
  font-size: 1.25rem;
  margin-top: calc(var(--space) * 1.5);
}

p {
  margin-bottom: var(--space);
  max-width: 75ch;
}

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: 0.85em;
}

ul, ol {
  margin-bottom: var(--space);
  padding-left: calc(var(--space) * 2);
}

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

ul.authority-links {
  list-style: none;
  padding-left: 0;
}

ul.authority-links li {
  margin-bottom: var(--space);
  padding-left: calc(var(--space) * 1.5);
  position: relative;
}

ul.authority-links li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 700;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: calc(var(--space) * 1.5) 0;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  font-size: 0.95rem;
}

@media (max-width: 767px) {
  table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}

caption {
  font-weight: 600;
  text-align: left;
  padding: var(--space);
  background-color: var(--color-bg);
  color: var(--color-secondary);
  font-size: 1rem;
}

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

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

th {
  padding: calc(var(--space) * 0.75) var(--space);
  text-align: left;
  font-weight: 600;
  letter-spacing: 0.02em;
}

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

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

tbody tr:hover {
  background-color: rgba(31, 111, 122, 0.05);
}

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

details[open] {
  background-color: var(--color-bg);
  box-shadow: var(--shadow);
}

summary {
  font-weight: 600;
  cursor: pointer;
  color: var(--color-secondary);
  padding: calc(var(--space) * 0.5);
  margin: calc(var(--space) * -0.5);
  border-radius: calc(var(--radius) - 2px);
  transition: background-color 0.2s ease, color 0.2s ease;
  list-style: none;
}

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

summary::before {
  content: "▸ ";
  display: inline-block;
  transition: transform 0.2s ease;
  color: var(--color-accent);
  font-weight: 700;
}

details[open] summary::before {
  transform: rotate(90deg);
}

summary:hover {
  background-color: rgba(31, 111, 122, 0.08);
  color: var(--color-primary);
}

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

details p {
  margin-top: var(--space);
}

blockquote {
  border-left: 4px solid var(--color-accent);
  padding: var(--space) calc(var(--space) * 1.5);
  margin: calc(var(--space) * 1.5) 0;
  background-color: rgba(246, 247, 249, 0.6);
  font-style: italic;
  color: var(--color-muted);
  border-radius: 0 var(--radius) var(--radius) 0;
}

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

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

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

aside.checklist ul {
  margin-bottom: 0;
}

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

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

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

.disclaimer {
  font-size: 0.9rem;
  color: var(--color-muted);
  font-style: italic;
  padding: var(--space);
  background-color: var(--color-bg);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  margin-top: var(--space);
}

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

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

@media (min-width: 1024px) {
  .intro {
    column-count: 2;
    column-gap: calc(var(--space) * 2);
  }
  .intro p {
    break-inside: avoid;
  }
}

footer {
  background-color: var(--color-secondary);
  color: var(--color-surface);
  padding: calc(var(--space) * 2) 0;
  margin-top: calc(var(--space) * 4);
  text-align: center;
}

footer p {
  margin: 0;
  font-size: 0.9rem;
}

@media (min-width: 768px) {
  main {
    padding: calc(var(--space) * 4) 0;
  }
}

@media (min-width: 1024px) {
  :root {
    --space: 1.25rem;
  }
}