:root {
  --color-primary: #1E3A8A;
  --color-secondary: #0F766E;
  --color-accent: #F97316;
  --color-background: #F8FAFC;
  --color-surface: #FFFFFF;
  --color-text: #0B1220;
  --color-text-muted: #475569;
  --color-border: #CBD5E1;
  --radius: 14px;
  --space: 1rem;
  --max-width: 72rem;
  --shadow: 0 10px 30px rgba(11, 18, 32, 0.08);
  --font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

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

body {
  font-family: var(--font-system);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease;
}

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

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

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: calc(var(--space) * 0.75);
  letter-spacing: -0.02em;
}

h1 {
  font-size: 2rem;
  margin-bottom: var(--space);
}

h2 {
  font-size: 1.75rem;
  margin-top: calc(var(--space) * 2);
  margin-bottom: calc(var(--space) * 0.875);
}

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

h4 {
  font-size: 1.25rem;
}

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

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

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

body {
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100vh;
}

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

header .header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: calc(var(--space) * 1.25) var(--space);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space);
}

header .site-name {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.03em;
}

header .site-name a {
  color: inherit;
}

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

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

nav a {
  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;
}

nav a:hover {
  border-bottom-color: var(--color-accent);
}

nav a:focus-visible {
  outline-offset: 6px;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: calc(var(--space) * 2) var(--space);
  width: 100%;
}

.breadcrumbs {
  margin-bottom: calc(var(--space) * 1.5);
  font-size: 0.875rem;
}

.breadcrumbs ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--space) * 0.5);
  align-items: center;
}

.breadcrumbs li {
  margin: 0;
  display: flex;
  align-items: center;
  gap: calc(var(--space) * 0.5);
}

.breadcrumbs li:not(:last-child)::after {
  content: "›";
  color: var(--color-text-muted);
  font-weight: 400;
}

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

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

.breadcrumbs li:last-child {
  color: var(--color-text);
  font-weight: 500;
}

section {
  margin-bottom: calc(var(--space) * 3);
}

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;
  box-shadow: var(--shadow);
}

caption {
  font-weight: 600;
  text-align: left;
  padding: var(--space);
  background-color: var(--color-surface);
  border-bottom: 2px solid var(--color-primary);
  font-size: 1.125rem;
}

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

th {
  padding: calc(var(--space) * 0.875) var(--space);
  text-align: left;
  font-weight: 600;
  letter-spacing: 0.01em;
}

td {
  padding: calc(var(--space) * 0.875) var(--space);
  border-top: 1px solid var(--color-border);
}

tbody tr {
  transition: background-color 0.2s ease;
}

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

tbody tr:hover {
  background-color: rgba(30, 58, 138, 0.05);
}

details {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: var(--space);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(11, 18, 32, 0.04);
}

summary {
  padding: calc(var(--space) * 0.875) var(--space);
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color 0.2s ease, color 0.2s ease;
  color: var(--color-primary);
}

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

summary::after {
  content: "›";
  font-size: 1.5rem;
  font-weight: 400;
  transform: rotate(0deg);
  transition: transform 0.3s ease;
  color: var(--color-accent);
  flex-shrink: 0;
  margin-left: var(--space);
}

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

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

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

details .details-content {
  padding: var(--space);
  border-top: 1px solid var(--color-border);
}

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

blockquote {
  margin: calc(var(--space) * 1.5) 0;
  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;
  font-style: italic;
  color: var(--color-text-muted);
  box-shadow: 0 2px 8px rgba(11, 18, 32, 0.04);
}

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

footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  margin-top: calc(var(--space) * 3);
}

footer .footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: calc(var(--space) * 2) var(--space);
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

footer a {
  color: var(--color-text-muted);
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

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

.cta {
  background-color: var(--color-surface);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius);
  padding: calc(var(--space) * 1.5);
  margin: calc(var(--space) * 2) 0;
  box-shadow: var(--shadow);
}

.cta h2, .cta h3 {
  margin-top: 0;
  color: var(--color-primary);
}

button, .button {
  display: inline-block;
  padding: calc(var(--space) * 0.75) calc(var(--space) * 1.5);
  background-color: var(--color-primary);
  color: var(--color-surface);
  border: none;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.2s ease;
  text-align: center;
}

button:hover, .button:hover {
  background-color: var(--color-accent);
  color: var(--color-surface);
  transform: translateY(-1px);
}

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

button:active, .button:active {
  transform: translateY(0);
}

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

  h2 {
    font-size: 2rem;
  }

  h3 {
    font-size: 1.625rem;
  }

  main {
    padding: calc(var(--space) * 3) calc(var(--space) * 2);
  }

  header .header-inner {
    flex-wrap: nowrap;
  }

  table {
    font-size: 0.9375rem;
  }

  thead th {
    position: sticky;
    top: 0;
    z-index: 10;
    background-color: var(--color-primary);
  }

  .grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: calc(var(--space) * 2);
  }
}

@media (min-width: 1024px) {
  h1 {
    font-size: 3rem;
  }

  h2 {
    font-size: 2.25rem;
  }

  h3 {
    font-size: 1.75rem;
  }

  main {
    padding: calc(var(--space) * 4) calc(var(--space) * 2);
  }

  .grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: calc(var(--space) * 2);
  }

  section {
    margin-bottom: calc(var(--space) * 4);
  }
}

@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;
  }

  html {
    scroll-behavior: auto;
  }

  summary::after {
    transition: none;
  }
}

@media print {
  * {
    background: transparent !important;
    color: black !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }

  a, a:visited {
    text-decoration: underline;
  }

  a[href]::after {
    content: " (" attr(href) ")";
  }

  thead {
    display: table-header-group;
  }

  tr, img {
    page-break-inside: avoid;
  }

  h2, h3 {
    page-break-after: avoid;
  }

  header, footer, nav {
    display: none;
  }

  main {
    max-width: 100%;
    padding: 0;
  }

  details {
    border: 1px solid #000;
  }

  summary::after {
    display: none;
  }

  details .details-content {
    display: block !important;
  }
}

:focus {
  outline: none;
}

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

::selection {
  background-color: var(--color-accent);
  color: var(--color-surface);
}

.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;
}

code, pre {
  font-family: "Courier New", Courier, monospace;
  background-color: var(--color-background);
  padding: 0.125rem 0.375rem;
  border-radius: 4px;
  font-size: 0.9em;
}

pre {
  padding: var(--space);
  overflow-x: auto;
  border: 1px solid var(--color-border);
}

hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: calc(var(--space) * 2) 0;
}

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

.text-center {
  text-align: center;
}

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-1 { margin-top: var(--space); }
.mb-1 { margin-bottom: var(--space); }
.mt-2 { margin-top: calc(var(--space) * 2); }
.mb-2 { margin-bottom: calc(var(--space) * 2); }