:root {
  --color-primary: #2B4C7E;
  --color-secondary: #1F7A6B;
  --color-accent: #E07A2F;
  --color-background: #F6F4EF;
  --color-surface: #FFFFFF;
  --color-text: #14161A;
  --color-text-muted: #4B5563;
  --color-border: #D7D2C7;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(20, 22, 26, 0.10);
  --space: clamp(12px, 1.6vw, 18px);
  --grid-rhythm: 1.5rem;
}

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

html {
  font-size: 100%;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}

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;
  margin: 0;
  padding: 0;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input, button, textarea, select {
  font: inherit;
}

p, h1, h2, h3, h4, h5, h6 {
  overflow-wrap: break-word;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 600;
  margin-bottom: var(--grid-rhythm);
}

h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: calc(var(--grid-rhythm) * 1.5);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  margin-top: calc(var(--grid-rhythm) * 2);
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  margin-top: calc(var(--grid-rhythm) * 1.5);
}

h4 {
  font-size: 1.125rem;
  margin-top: var(--grid-rhythm);
}

p {
  margin-bottom: var(--grid-rhythm);
}

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-secondary);
  text-decoration-color: var(--color-accent);
}

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

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);
  padding: calc(var(--space) * 1.5) var(--space);
  box-shadow: var(--shadow);
}

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

header .site-name {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: -0.01em;
}

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

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

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

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

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

.breadcrumbs {
  background-color: var(--color-surface);
  padding: calc(var(--space) * 0.75) var(--space);
  border-bottom: 1px solid var(--color-border);
  font-size: 0.875rem;
}

.breadcrumbs nav {
  max-width: 1200px;
  margin: 0 auto;
}

.breadcrumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.breadcrumbs li::after {
  content: "›";
  margin-left: 0.5rem;
  color: var(--color-text-muted);
}

.breadcrumbs li:last-child::after {
  content: "";
}

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

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

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: calc(var(--space) * 2) var(--space);
  width: 100%;
}

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

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

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

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

aside h3, aside h4 {
  margin-top: 0;
  color: var(--color-primary);
}

blockquote {
  background-color: var(--color-surface);
  border-left: 4px solid var(--color-secondary);
  padding: var(--grid-rhythm) calc(var(--grid-rhythm) * 1.5);
  margin: calc(var(--grid-rhythm) * 1.5) 0;
  font-style: italic;
  color: var(--color-text-muted);
  box-shadow: 0 2px 8px rgba(20, 22, 26, 0.05);
}

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

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

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

table {
  width: 100%;
  border-collapse: collapse;
  margin: calc(var(--grid-rhythm) * 1.5) 0;
  background-color: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(20, 22, 26, 0.05);
}

.table-container {
  overflow-x: auto;
  margin: calc(var(--grid-rhythm) * 1.5) 0;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

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

th {
  background-color: var(--color-primary);
  color: var(--color-surface);
  font-weight: 600;
  letter-spacing: 0.01em;
}

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

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

tbody tr:hover {
  background-color: var(--color-background);
}

details {
  background-color: var(--color-surface);
  border-left: 3px solid var(--color-border);
  padding: var(--space);
  margin-bottom: var(--grid-rhythm);
  border-radius: 0 var(--radius) var(--radius) 0;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

details:hover {
  border-left-color: var(--color-accent);
}

details[open] {
  background-color: var(--color-background);
  border-left-color: var(--color-accent);
  padding-bottom: calc(var(--space) * 1.5);
}

summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--color-primary);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: color 0.2s ease;
  padding: calc(var(--space) * 0.5);
  margin: calc(var(--space) * -0.5);
  border-radius: var(--radius);
}

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

summary::before {
  content: "▸";
  display: inline-block;
  transition: transform 0.2s ease;
  color: var(--color-accent);
  font-size: 1.2em;
}

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

summary:hover {
  color: var(--color-secondary);
}

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

details div {
  margin-top: var(--grid-rhythm);
  padding-left: calc(var(--space) * 1.5);
}

footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: calc(var(--space) * 2) var(--space);
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-top: calc(var(--grid-rhythm) * 3);
}

footer p {
  margin-bottom: 0;
}

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

button:hover, .button:hover {
  background-color: var(--color-secondary);
  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) {
  header .header-container {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }

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

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

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

  table tbody tr:nth-child(even):hover {
    background-color: #ebe9e0;
  }
}

@media (min-width: 1024px) {
  :root {
    --grid-rhythm: 1.75rem;
  }

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

  nav ul {
    gap: calc(var(--space) * 2);
  }
}

*:focus:not(:focus-visible) {
  outline: none;
}

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

@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;
  }
}

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

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

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

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

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

  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
  }

  details {
    border: 1px solid black;
  }

  details[open] summary::before {
    content: "";
  }
}