:root {
  --font-sans: "Gill Sans", "Gill Sans MT", Calibri, "Trebuchet MS", sans-serif;
  --font-serif: "Libre Baskerville", Georgia, serif;

  --color-text: #18181b;
  --color-muted: #3f3f46;
  --color-subtle: #71717a;
  --color-border: #e4e4e7;
  --color-paper: #ffffff;
  --color-bg: #fafaf9;
  --color-charcoal: #232323;
  --color-accent: #6E2C3A;
}

/* ---------- Global typography ---------- */

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
}

.serif {
  font-family: var(--font-serif);
}

.sans {
  font-family: var(--font-sans);
}

/* ---------- Brand utilities ---------- */

.brand-accent {
  color: var(--color-accent);
}

.brand-bg {
  background-color: var(--color-charcoal);
}

/* ---------- Layout ---------- */

.page-section {
  max-width: 56rem;
  margin: 0 auto;
  padding: 5rem 1.5rem;
}

.wide-section {
  max-width: 72rem;
  margin: 0 auto;
  padding: 5rem 1.5rem;
}

/* ---------- Core page elements ---------- */

.eyebrow {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.25em;
  color: var(--color-accent);
  font-weight: 600;
}

.page-title {
  font-family: var(--font-serif);
  margin-top: 1.5rem;
  font-size: 3rem;
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--color-text);
}

.body-copy {
  margin-top: 2rem;
  font-family: var(--font-sans);
  font-size: 1.125rem;
  line-height: 2rem;
  color: var(--color-muted);
}

.card {
  border: 1px solid var(--color-border);
  background: var(--color-paper);
  border-radius: 1.5rem;
  padding: 2rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.primary-button {
  display: inline-block;
  border-radius: 9999px;
  background: var(--color-text);
  padding: 0.75rem 1.75rem;
  color: white;
  font-weight: 500;
  text-decoration: none;
}

.primary-button:hover {
  background: var(--color-muted);
}

/* ---------- Generic two-column layout ---------- */

.container {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2rem;
}

.column {
  font-family: var(--font-sans);
}

/* ---------- Markdown article styling ---------- */

.article-content {
  font-family: var(--font-sans);
  color: var(--color-muted);
  font-size: 1.125rem;
  line-height: 2rem;
}

.article-content p {
  margin: 1.25rem 0;
}

.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4 {
  font-family: var(--font-serif);
  color: var(--color-text);
  line-height: 1.2;
  margin-top: 3rem;
  margin-bottom: 1rem;
}

.article-content h1 {
  font-size: 2.5rem;
}

.article-content h2 {
  font-size: 2rem;
}

.article-content h3 {
  font-size: 1.5rem;
}

.article-content h4 {
  font-size: 1.25rem;
}

.article-content ul,
.article-content ol {
  margin: 1.5rem 0;
  padding-left: 2rem;
}

.article-content li {
  margin: 0.5rem 0;
}

.article-content ul li {
  list-style-type: disc;
}

.article-content ol li {
  list-style-type: decimal;
}

.article-content blockquote {
  border-left: 4px solid #d4d4d8;
  padding-left: 1.5rem;
  margin: 2rem 0;
  color: #52525b;
  font-style: italic;
}

.article-content hr {
  margin: 3rem 0;
  border: none;
  border-top: 1px solid #d4d4d8;
}

.article-content a {
  color: var(--color-text);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-content strong {
  font-weight: 600;
  color: var(--color-text);
}

.article-content code {
  background: #f4f4f5;
  padding: 0.15rem 0.35rem;
  border-radius: 0.35rem;
  font-size: 0.95rem;
}

/* ---------- Columns inside Markdown/articles ---------- */

.article-content .container {
  margin: 2.5rem 0;
}

.article-content .column {
  padding: 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: 1.25rem;
  background: var(--color-paper);

  font-family: var(--font-sans);
  font-size: inherit;
  line-height: inherit;
  color: inherit;
}

.article-content .column p,
.article-content .column ul,
.article-content .column ol,
.article-content .column li {
  font-family: var(--font-sans);
  font-size: inherit;
  line-height: inherit;
  color: inherit;
}

.article-content .column p {
  margin: 1rem 0;
}

.article-content .column ul,
.article-content .column ol {
  margin: 1rem 0;
  padding-left: 1.5rem;
}

.article-content .column li {
  margin: 0.35rem 0;
}

.article-content .column h1,
.article-content .column h2,
.article-content .column h3,
.article-content .column h4,
.article-content .column h5,
.article-content .column h6 {
  font-family: var(--font-sans);
  font-size: 1.15rem;
  line-height: 1.4;
  font-weight: 600;
  color: var(--color-text);
  margin-top: 0;
  margin-bottom: 1rem;
}

/* ---------- Optional sans-heading article mode ---------- */

.article-content.sans-headings h1,
.article-content.sans-headings h2,
.article-content.sans-headings h3,
.article-content.sans-headings h4 {
  font-family: var(--font-sans);
}

/* ---------- Responsive ---------- */

@media (max-width: 768px) {
  .page-title {
    font-size: 2.35rem;
  }

  .page-section,
  .wide-section {
    padding-top: 4rem;
    padding-bottom: 4rem;
  }

  .container,
  .article-content .container {
    grid-template-columns: 1fr;
  }
}

.references {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.references h2 {
  font-size: 1.5rem;
}

.references ul {
  padding-left: 1.5rem;
}

.references li {
  margin: 0.75rem 0;
  line-height: 1.8;
}