:root {
  --color-primary: #1E4D6B;
  --color-secondary: #2F7A6D;
  --color-accent: #D97A2B;
  --color-background: #F6F4EF;
  --color-surface: #FFFFFF;
  --color-text: #14212B;
  --color-text-muted: #4E5E6B;
  --color-border: #D6D2C8;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(20, 33, 43, 0.10);
  --space: clamp(14px, 2.2vw, 22px);
}

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

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
  letter-spacing: 0.01em;
}

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

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

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

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

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 0.75em;
  text-align: left;
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  color: var(--color-primary);
  margin-bottom: 1em;
}

h2 {
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  color: var(--color-primary);
  margin-top: 1.5em;
}

h3 {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  color: var(--color-secondary);
  margin-top: 1.25em;
}

p {
  margin-bottom: 1em;
}

ul, ol {
  margin-bottom: 1em;
  padding-left: 1.5em;
}

li {
  margin-bottom: 0.5em;
}

.page-shell {
  display: grid;
  grid-template-columns: 1fr;
  grid-template-areas:
    "header"
    "main"
    "footer";
  min-height: 100vh;
  gap: 0;
}

header {
  grid-area: header;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space) calc(var(--space) * 1.5);
}

header .header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: calc(var(--space) * 0.75);
}

header .site-name {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

header .site-name a {
  color: inherit;
  text-decoration: none;
}

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

header nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--space) * 1.25);
}

header nav a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  transition: color 0.2s ease, transform 0.2s ease;
  display: inline-block;
}

header nav a:hover {
  color: var(--color-accent);
  text-decoration: none;
  transform: translateX(2px);
}

main {
  grid-area: main;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: calc(var(--space) * 2) calc(var(--space) * 1.5);
  display: grid;
  grid-template-columns: 1fr;
  gap: calc(var(--space) * 2);
}

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

aside {
  background-color: var(--color-surface);
  padding: calc(var(--space) * 1.5);
  border-radius: var(--radius);
  border-left: 4px solid var(--color-accent);
  box-shadow: var(--shadow);
}

aside h2, aside h3 {
  font-size: 1.125rem;
  margin-top: 0;
}

section {
  margin-bottom: calc(var(--space) * 2.5);
}

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

footer {
  grid-area: 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-text-muted);
  font-size: 0.875rem;
  margin-top: auto;
}

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

.breadcrumbs nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5em;
  align-items: center;
}

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

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

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

blockquote {
  background-color: var(--color-surface);
  border-left: 4px solid var(--color-accent);
  padding: calc(var(--space) * 1.25);
  margin: calc(var(--space) * 1.5) 0;
  font-style: italic;
  color: var(--color-text);
  border-radius: 0 var(--radius) var(--radius) 0;
  box-shadow: 0 2px 8px rgba(20, 33, 43, 0.06);
}

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

.table-wrapper {
  overflow-x: auto;
  margin: calc(var(--space) * 1.5) 0;
  border-radius: var(--radius);
  box-shadow: 0 2px 8px rgba(20, 33, 43, 0.06);
}

table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--color-surface);
  font-size: 0.9375rem;
}

caption {
  text-align: left;
  font-weight: 600;
  color: var(--color-primary);
  padding: calc(var(--space) * 0.75);
  background-color: var(--color-surface);
  border-bottom: 2px solid var(--color-border);
  caption-side: top;
}

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

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

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

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

tbody tr:hover {
  background-color: rgba(30, 77, 107, 0.05);
  transition: background-color 0.2s ease;
}

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

details[open] {
  border-color: var(--color-accent);
  background-color: rgba(217, 122, 43, 0.02);
}

summary {
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
  list-style: none;
  padding: calc(var(--space) * 0.5);
  margin: calc(var(--space) * -0.5);
  border-radius: var(--radius);
  transition: color 0.2s ease, background-color 0.2s ease;
  position: relative;
  padding-left: calc(var(--space) * 1.5);
}

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

summary::before {
  content: "▸";
  position: absolute;
  left: calc(var(--space) * 0.25);
  color: var(--color-accent);
  font-size: 1.125rem;
  transition: transform 0.2s ease;
}

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

summary:hover {
  color: var(--color-accent);
  background-color: rgba(30, 77, 107, 0.03);
}

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

details .details-content {
  padding-top: calc(var(--space) * 1);
  padding-left: calc(var(--space) * 0.5);
}

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-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

button:hover, .button:hover {
  background-color: var(--color-accent);
  transform: translateY(-2px);
  text-decoration: none;
}

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) {
  header .header-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }

  main {
    grid-template-columns: 1fr 320px;
    gap: calc(var(--space) * 2.5);
  }

  main.single-column {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 2.25rem;
  }

  h2 {
    font-size: 1.875rem;
  }

  h3 {
    font-size: 1.5rem;
  }

  table {
    font-size: 1rem;
  }

  thead {
    position: sticky;
    top: 0;
    z-index: 10;
  }
}

@media (min-width: 1024px) {
  main {
    grid-template-columns: 1fr 360px;
    gap: calc(var(--space) * 3);
  }

  h1 {
    font-size: 2.5rem;
  }

  h2 {
    font-size: 2rem;
  }

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

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

@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;
  }

  a:hover, button:hover, .button:hover, summary:hover, header nav a:hover {
    transform: none;
  }

  details[open] summary::before {
    transform: none;
  }
}

@media print {
  body {
    background-color: white;
    color: black;
  }

  header, footer, aside, nav, .breadcrumbs {
    display: none;
  }

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

  article {
    box-shadow: none;
    padding: 0;
  }

  a {
    color: black;
    text-decoration: underline;
  }

  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.875rem;
  }

  details {
    border: 1px solid #ccc;
  }

  summary::before {
    content: "";
  }

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