:root {
  --color-primary: #1F6F78;
  --color-secondary: #2E3A59;
  --color-accent: #C45A2A;
  --color-background: #F6F7F4;
  --color-surface: #FFFFFF;
  --color-text: #15202B;
  --color-text-muted: #4B5A6A;
  --color-border: #D7DEE6;
  --radius: 14px;
  --space: 1rem;
  --maxw: 72rem;
  --shadow: 0 10px 30px rgba(21, 32, 43, 0.08);
}

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

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
  line-height: 1.6;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--color-background);
  color: var(--color-text);
  font-size: 1rem;
  line-height: 1.6;
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  grid-template-columns: 1fr;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  text-align: left;
  margin-bottom: calc(var(--space) * 1.5);
  margin-top: calc(var(--space) * 2);
  color: var(--color-secondary);
}

h1 {
  font-size: clamp(1.875rem, 4vw, 3rem);
  margin-top: 0;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
}

h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
}

h4 {
  font-size: clamp(1.125rem, 2vw, 1.5rem);
}

p {
  margin-bottom: var(--space);
  max-width: 70ch;
}

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;
}

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

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

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(--maxw);
  margin: 0 auto;
  padding: calc(var(--space) * 1.5) var(--space);
  display: flex;
  flex-direction: column;
  gap: var(--space);
}

header .site-name {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 700;
  color: var(--color-secondary);
  text-decoration: none;
  margin: 0;
}

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

nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--space) * 1.5);
  align-items: center;
}

nav a {
  text-decoration: none;
  font-weight: 500;
  color: var(--color-text);
  padding: 0.5rem 0;
  transition: color 0.2s ease;
}

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

main {
  max-width: var(--maxw);
  width: 100%;
  margin: 0 auto;
  padding: calc(var(--space) * 3) var(--space);
  display: grid;
  grid-template-columns: 1fr;
  gap: calc(var(--space) * 3);
}

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

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

aside {
  background-color: var(--color-background);
  border-left: 4px solid var(--color-accent);
  padding: calc(var(--space) * 1.5);
  margin: calc(var(--space) * 2) 0;
  border-radius: 0 var(--radius) var(--radius) 0;
}

blockquote {
  border-left: 6px solid var(--color-primary);
  padding-left: calc(var(--space) * 2);
  margin: calc(var(--space) * 2) 0;
  font-style: italic;
  color: var(--color-text-muted);
  background-color: var(--color-background);
  padding: calc(var(--space) * 1.5) calc(var(--space) * 2);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.breadcrumbs {
  margin-bottom: calc(var(--space) * 2);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

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

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

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

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

table {
  width: 100%;
  border-collapse: collapse;
  margin: calc(var(--space) * 2) 0;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

caption {
  text-align: left;
  font-weight: 700;
  font-size: 1.125rem;
  padding: var(--space);
  background-color: var(--color-background);
  color: var(--color-secondary);
  caption-side: top;
}

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

thead th {
  text-align: left;
  padding: calc(var(--space) * 1.25);
  font-weight: 600;
}

tbody tr {
  border-bottom: 1px solid var(--color-border);
  transition: background-color 0.2s ease;
}

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

tbody tr:hover {
  background-color: rgba(31, 111, 120, 0.05);
}

tbody td {
  padding: calc(var(--space) * 1.25);
  text-align: left;
}

details {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: var(--space);
  overflow: hidden;
  box-shadow: var(--shadow);
}

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

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

summary::before {
  content: '▶';
  display: inline-block;
  transition: transform 0.2s ease;
  font-size: 0.75em;
}

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

summary:hover {
  background-color: rgba(31, 111, 120, 0.08);
}

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

details[open] summary {
  border-bottom: 1px solid var(--color-border);
}

details > div {
  padding: calc(var(--space) * 1.5);
}

footer {
  background-color: var(--color-secondary);
  color: var(--color-surface);
  padding: calc(var(--space) * 2) var(--space);
  border-top: 4px solid var(--color-primary);
  margin-top: calc(var(--space) * 3);
}

footer .footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  text-align: center;
}

footer a {
  color: var(--color-surface);
  text-decoration-color: rgba(255, 255, 255, 0.5);
}

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

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

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

@media (min-width: 768px) {
  header .header-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
  
  main {
    padding: calc(var(--space) * 4) calc(var(--space) * 2);
  }
  
  section {
    padding: calc(var(--space) * 3);
  }
  
  nav ul {
    gap: calc(var(--space) * 2);
  }
}

@media (min-width: 1024px) {
  table {
    display: table;
  }
  
  thead {
    position: sticky;
    top: 0;
    z-index: 10;
  }
  
  thead th {
    position: sticky;
    top: 0;
    background-color: var(--color-secondary);
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  summary::before {
    transition: none;
  }
  
  a, summary, tbody tr {
    transition: none;
  }
}

@media print {
  body {
    background-color: white;
    color: black;
  }
  
  header, footer, nav {
    display: none;
  }
  
  main {
    max-width: 100%;
    padding: 0;
  }
  
  section {
    box-shadow: none;
    border: 1px solid #ccc;
    page-break-inside: avoid;
  }
  
  a {
    color: black;
    text-decoration: underline;
  }
  
  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.875rem;
    color: #555;
  }
  
  details {
    border: 1px solid #ccc;
  }
  
  summary::before {
    content: '';
  }
  
  details > div {
    display: block !important;
  }
  
  table {
    page-break-inside: avoid;
  }
  
  thead {
    display: table-header-group;
  }
}

:focus {
  outline: none;
}

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

button, input, select, textarea {
  font-family: inherit;
  font-size: 100%;
}

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