:root {
  --color-background: #ffffff;
  --color-heading: #4169e1;
  --color-heading-dark: #2f52d0;
  --color-text: #111111;
  --color-muted: #4b5563;
  --color-surface: #eaf1ff;
  --color-border: #d6e4ff;
  --color-shadow: rgba(47, 82, 208, 0.08);
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4.5rem;
  --page-gutter: clamp(1rem, 3vw, 1.5rem);
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --hero-width: 60rem;
  --reading-width: 48rem;
}

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

html {
  color-scheme: light;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--color-background);
  color: var(--color-text);
  font-family: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino,
    Georgia, serif;
  font-size: 1rem;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--color-heading-dark);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.16em;
}

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

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--color-heading-dark);
  outline-offset: 3px;
  border-radius: 0.25rem;
}

.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -3rem;
  z-index: 10;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--color-heading-dark);
  color: var(--color-background);
  text-decoration: none;
}

.skip-link:focus {
  top: var(--space-2);
}

.site-header {
  padding: var(--space-6) 0 var(--space-5);
  background:
    radial-gradient(circle at top right, rgba(65, 105, 225, 0.12), transparent 30%),
    linear-gradient(180deg, rgba(234, 241, 255, 0.8) 0%, rgba(255, 255, 255, 0.98) 72%);
  border-bottom: 1px solid var(--color-border);
}

.hero-wrap,
.reading-shell,
.footer-wrap {
  width: min(100% - (2 * var(--page-gutter)), var(--hero-width));
  margin: 0 auto;
}

.reading-shell {
  width: min(100% - (2 * var(--page-gutter)), var(--reading-width));
}

.eyebrow {
  margin: 0 0 var(--space-1);
  color: var(--color-heading-dark);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.eyebrow--compact {
  margin-bottom: 0.75rem;
  font-size: 0.82rem;
}

h1,
h2,
h3 {
  color: var(--color-heading);
  line-height: 1.18;
  letter-spacing: -0.02em;
}

h1 {
  margin: 0;
  max-width: 16ch;
  font-size: clamp(2.4rem, 5vw, 4.25rem);
}

.lede {
  margin: var(--space-3) 0 0;
  max-width: 46rem;
  font-size: clamp(1.08rem, 2vw, 1.25rem);
  color: var(--color-muted);
}

.hero-summary {
  margin: var(--space-3) 0 0;
  max-width: 42rem;
  color: var(--color-muted);
}

.site-main {
  padding: var(--space-5) 0 var(--space-6);
}

.toc-panel,
.article-shell {
  padding: var(--space-4);
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: 0 18px 40px var(--color-shadow);
}

.toc-panel {
  margin-bottom: var(--space-4);
  background: var(--color-surface);
  box-shadow: 0 14px 32px var(--color-shadow);
}

.toc-panel h2 {
  margin: 0;
  font-size: 1.2rem;
}

.toc-note {
  margin: 0.75rem 0 var(--space-3);
  color: var(--color-muted);
}

.toc-list {
  margin: 0;
  padding-left: 1.25rem;
  display: grid;
  gap: 0.9rem 1.5rem;
}

.toc-list a {
  color: var(--color-muted);
  text-decoration: none;
}

.toc-list a:hover,
.toc-list a[aria-current="location"] {
  color: var(--color-heading-dark);
}

.article-header p:first-child,
.article-intro {
  margin-top: 0;
}

.article-intro {
  font-size: 1.13rem;
}

.article-header {
  padding-bottom: var(--space-2);
}

.article-shell p,
.article-shell li {
  max-width: 68ch;
}

.article-shell p {
  margin: 0 0 var(--space-3);
}

.article-section {
  padding-top: var(--space-4);
  margin-top: var(--space-4);
  border-top: 1px solid var(--color-border);
  scroll-margin-top: var(--space-4);
}

.article-section h2 {
  margin: 0 0 var(--space-3);
  font-size: clamp(1.5rem, 2.5vw, 2rem);
}

.callout {
  margin: var(--space-4) 0 0;
  padding: var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-heading-dark);
  border-radius: var(--radius-md);
  box-shadow: 0 10px 24px rgba(47, 82, 208, 0.06);
}

.callout h3 {
  margin: 0 0 0.65rem;
  color: var(--color-heading-dark);
  font-size: 1rem;
}

.callout p {
  margin: 0;
}

.resource-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--space-2);
}

.resource-list li {
  padding: 0.95rem 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.resource-list a {
  word-break: break-word;
}

.site-footer {
  padding: var(--space-4) 0;
  border-top: 1px solid var(--color-border);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, rgba(234, 241, 255, 0.55) 100%);
  color: var(--color-muted);
}

.footer-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
  justify-content: space-between;
}

.site-footer p {
  margin: 0;
}

.footer-copy {
  max-width: 36rem;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem 1.25rem;
}

.footer-nav a {
  color: var(--color-muted);
  text-decoration: none;
}

.footer-nav a:hover,
.footer-nav a:focus-visible {
  color: var(--color-heading-dark);
}

.button-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-heading-dark);
  text-decoration: none;
  box-shadow: 0 10px 24px rgba(47, 82, 208, 0.06);
}

.not-found-main {
  padding: var(--space-5) 0 var(--space-6);
}

.not-found-card h2 {
  margin-top: 0;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (min-width: 700px) {
  .toc-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .site-header {
    padding: var(--space-5) 0 var(--space-4);
  }

  h1 {
    max-width: none;
    font-size: clamp(2rem, 8.6vw, 2.9rem);
  }

  .lede,
  .hero-summary {
    font-size: 1rem;
  }

  .toc-panel,
  .article-shell {
    padding: var(--space-3);
  }

  .article-section {
    padding-top: var(--space-3);
    margin-top: var(--space-3);
  }

  .callout {
    padding: 1.1rem;
  }

  .footer-wrap {
    align-items: flex-start;
  }
}

@media (max-width: 420px) {
  .toc-list {
    padding-left: 1rem;
  }

  .resource-list li {
    padding: 0.85rem 0.9rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}

@media print {
  @page {
    margin: 0.7in;
  }

  body {
    font-size: 11pt;
    line-height: 1.55;
    background: #ffffff;
  }

  .skip-link,
  .site-footer {
    display: none;
  }

  .site-header,
  .site-main,
  .not-found-main {
    padding: 0;
    background: #ffffff;
    border: 0;
  }

  .hero-wrap,
  .reading-shell {
    width: 100%;
    max-width: none;
  }

  .toc-panel,
  .article-shell,
  .callout,
  .resource-list li,
  .button-link {
    padding: 0;
    background: #ffffff;
    border: 0;
    box-shadow: none;
  }

  .toc-panel {
    margin-bottom: var(--space-3);
  }

  .article-section {
    margin-top: var(--space-3);
    padding-top: var(--space-3);
    border-top: 1px solid #cbd5e1;
    break-inside: avoid;
  }

  .callout {
    margin-top: var(--space-2);
    padding-left: 0.9rem;
    border-left: 3px solid var(--color-heading-dark);
  }

  a,
  a:visited {
    color: #000000;
    text-decoration: none;
  }

  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.9em;
    word-break: break-all;
  }
}