/* CSS Variables from Pinafore Editorial Cedar palette */
:root {
  --color-primary: #2E5E4E;
  --color-secondary: #2B3A67;
  --color-accent: #D07A2A;
  --color-bg: #F6F2EA;
  --color-surface: #FFFFFF;
  --color-text: #1B1F24;
  --color-muted: #4B5563;
  --color-border: #D7D0C6;
  --radius: 0.375rem;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --space: 1rem;
  --maxw: 72rem;
}

/* Reset and base styles */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  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 {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
}

/* Mobile-first typography scale with clamp() */
h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1.2;
  margin: 0 0 1rem;
  color: var(--color-primary);
  font-weight: 700;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.3;
  margin: 2rem 0 1rem;
  color: var(--color-secondary);
  font-weight: 600;
}

h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
  line-height: 1.4;
  margin: 1.5rem 0 0.75rem;
  color: var(--color-secondary);
  font-weight: 600;
}

p {
  margin: 0 0 1rem;
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 0.2em;
  transition: color 0.2s ease, text-underline-offset 0.2s ease;
}

a:hover {
  color: var(--color-accent);
  text-underline-offset: 0.3em;
}

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

/* Editorial grid layout using CSS Grid for page shell */
body {
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100vh;
}

header,
footer {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow);
}

footer {
  border-top: 1px solid var(--color-border);
  border-bottom: none;
}

header .container,
footer .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space);
  padding: var(--space);
  max-width: var(--maxw);
  margin: 0 auto;
}

.site-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

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

nav a:hover,
nav a[aria-current="page"] {
  color: var(--color-accent);
}

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

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

.container {
  max-width: var(--maxw);
  margin: 0 auto;
}

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

/* Breadcrumb navigation */
.breadcrumb {
  margin-bottom: 1.5rem;
}

.breadcrumb ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-muted);
}

.breadcrumb li:not(:last-child)::after {
  content: "/";
  margin-left: 0.5rem;
  color: var(--color-border);
}

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

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

/* Table styling with zebra striping and sticky header */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

caption {
  font-weight: 600;
  text-align: left;
  padding: 0.75rem;
  background-color: var(--color-bg);
  color: var(--color-secondary);
  border-bottom: 2px solid var(--color-border);
}

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

thead th {
  padding: 0.75rem;
  text-align: left;
  font-weight: 600;
}

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

tbody td {
  padding: 0.75rem;
  border-top: 1px solid var(--color-border);
}

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

/* Details/summary accordion with animated marker rotation */
details {
  margin: 1rem 0;
  padding: 1rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

summary {
  font-weight: 600;
  color: var(--color-secondary);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: color 0.2s ease;
}

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

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

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

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

@media (prefers-reduced-motion: reduce) {
  summary::before {
    transition: none;
  }
}

details p {
  margin-top: 0.75rem;
  color: var(--color-text);
}

/* Blockquote styling with left border accent and subtle background tint */
blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.5rem;
  background-color: var(--color-bg);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius);
  color: var(--color-muted);
  font-style: italic;
}

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

/* Footer styling */
footer p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.875rem;
}

/* Responsive breakpoints at 768px and 1024px */
@media (min-width: 768px) {
  main {
    padding: calc(var(--space) * 3) var(--space);
  }
  article {
    padding: calc(var(--space) * 3);
  }
  nav ul {
    gap: 1.5rem;
  }
}

@media (min-width: 1024px) {
  header .container,
  footer .container {
    padding: calc(var(--space) * 1.5) var(--space);
  }
  article {
    display: grid;
    grid-template-columns: 1fr;
    gap: calc(var(--space) * 2);
  }
}

/* Accessible focus-visible ring using accent color with offset and border fallback */
*:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Hover states for links and buttons with transition timing and underline-offset */
button,
.button {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background-color: var(--color-primary);
  color: var(--color-surface);
  border: none;
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.1s ease;
}

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

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

@media (prefers-reduced-motion: reduce) {
  button,
  .button {
    transition: none;
  }
  button:hover,
  .button:hover {
    transform: none;
  }
}

/* Section spacing */
section {
  margin-bottom: 2rem;
}

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

/* Utility for external link icons (optional, no images) */
a[rel*="noopener"]::after {
  content: " ↗";
  font-size: 0.875em;
  color: var(--color-muted);
}