:root {
  /* Core palette */
  --background: #f7f4ee;
  --surface: #fbf9f4;
  --surface-strong: #f1ece2;
  --text: #1f1f1a;
  --muted: #5d5b52;
  --border: #d9d3c6;
  --border-soft: rgba(217, 211, 198, 0.6);
  --accent: #66715b;
  --accent-deep: #4f5945;

  /* Typography */
  --font-serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, "Times New Roman", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;

  /* Layout */
  --page-width: 72rem;
  --content-width: 42rem;
  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4rem;
  --space-8: 6rem;
  --radius: 0.75rem;
  --transition: 160ms ease;
}

/* Base document styles */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: var(--font-serif);
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--accent-deep);
  text-decoration: none;
}

a:hover,
a:focus-visible {
  color: var(--accent);
}

p,
ul,
ol {
  margin: 0 0 var(--space-4);
  max-width: 66ch;
}

h1,
h2,
h3 {
  margin: 0 0 var(--space-3);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(3.2rem, 7.4vw, 5.6rem);
}

h2 {
  font-size: clamp(2.05rem, 4vw, 3rem);
}

h3 {
  font-size: 1.15rem;
}

em {
  font-style: italic;
}

/* Shared layout helpers */
.site-shell {
  width: min(calc(100% - 2.5rem), var(--page-width));
  margin: 0 auto;
}

.narrow-flow {
  max-width: 38rem;
}

.section {
  padding: var(--space-7) 0;
}

.section-quiet {
  padding-top: calc(var(--space-7) - 0.5rem);
  padding-bottom: calc(var(--space-7) - 0.5rem);
}

.section-bordered {
  border-top: 1px solid var(--border-soft);
}

.section-label,
.eyebrow,
.site-nav,
.button-link,
.footer-domain,
.note-title {
  font-family: var(--font-sans);
}

.section-label,
.eyebrow {
  margin-bottom: var(--space-3);
  color: var(--accent-deep);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.section-heading {
  max-width: 24rem;
}

.section-intro {
  margin-bottom: var(--space-5);
}

/* Header and navigation */
.site-header {
  border-bottom: 1px solid rgba(217, 211, 198, 0.5);
  background: rgba(247, 244, 238, 0.82);
  backdrop-filter: blur(8px);
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
  padding: 1rem 0;
  font-size: 0.92rem;
}

.site-brand {
  color: var(--text);
  font-weight: 600;
  letter-spacing: 0.01em;
}

.site-nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.site-nav-links a {
  color: var(--muted);
}

.site-nav-links a:hover,
.site-nav-links a:focus-visible {
  color: var(--text);
}

.site-nav-links a[aria-current="page"] {
  color: var(--text);
}

/* Hero sections */
.hero {
  padding: calc(var(--space-8) + 0.5rem) 0 var(--space-8);
}

.hero-compact {
  padding-bottom: var(--space-7);
}

.hero-home {
  padding-top: calc(var(--space-8) + 1rem);
}

.hero-panel {
  max-width: 46rem;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.hero-panel-compact {
  max-width: 40rem;
}

.hero-panel-flat {
  max-width: 40rem;
}

.hero-line {
  max-width: 30ch;
  margin-bottom: var(--space-4);
  color: var(--accent-deep);
  font-size: clamp(1.35rem, 2.5vw, 1.8rem);
  line-height: 1.3;
}

.hero-text {
  max-width: 38rem;
  color: var(--muted);
  font-size: 1.12rem;
}

/* Shared content layouts */
.feature-grid,
.status-grid,
.cta-panel,
.content-grid,
.media-layout {
  display: grid;
  gap: var(--space-5);
}

.feature-grid,
.content-grid {
  grid-template-columns: minmax(0, 1.75fr) minmax(14rem, 0.8fr);
  align-items: start;
}

.media-layout {
  grid-template-columns: minmax(20rem, 1.35fr) minmax(16rem, 0.9fr);
  align-items: start;
  gap: calc(var(--space-5) + 0.5rem);
  margin-top: var(--space-5);
}

.media-layout-reverse {
  grid-template-columns: minmax(15rem, 0.88fr) minmax(22rem, 1.38fr);
}

.media-layout-framework {
  align-items: center;
  grid-template-columns: minmax(14rem, 0.82fr) minmax(18rem, 1.1fr);
}

.feature-subtitle {
  color: var(--muted);
  font-size: 1.1rem;
}

.feature-note,
.info-card,
.status-item,
.link-card,
.resource-card,
.chapter-item {
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  background: rgba(251, 249, 244, 0.5);
}

.feature-note {
  padding: 1.35rem 1.5rem;
  color: var(--muted);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.55);
}

.note-title {
  margin-bottom: var(--space-2);
  color: var(--text);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-5);
}

.compact-grid {
  margin-top: var(--space-4);
}

.info-card {
  padding: 1.5rem 1.35rem 1.6rem;
  background: transparent;
  border-radius: 0;
  border-left: 0;
  border-right: 0;
  box-shadow: none;
}

.info-card p,
.status-item p {
  margin-bottom: 0;
  color: var(--muted);
}

.info-card h3 {
  margin-bottom: 0.7rem;
  font-size: 1.05rem;
  letter-spacing: 0;
}

.stack-list {
  display: grid;
  gap: var(--space-3);
}

.link-grid,
.resource-grid,
.series-grid,
.chapter-list {
  display: grid;
  gap: var(--space-4);
}

.link-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.resource-grid,
.series-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.link-card,
.resource-card,
.chapter-item {
  padding: 1.5rem;
}

.resource-card-large {
  padding: 1.75rem;
}

.link-card h3,
.resource-card h3,
.chapter-item h3 {
  margin-bottom: 0.75rem;
  font-size: 1.25rem;
}

.link-card p:last-of-type,
.resource-card p:last-of-type,
.chapter-item p:last-of-type {
  margin-bottom: 0;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  margin-top: var(--space-4);
  font-family: var(--font-sans);
  font-size: 0.94rem;
  font-weight: 600;
}

.text-link::after {
  content: "→";
}

.meta-copy {
  color: var(--muted);
  font-size: 0.98rem;
}

.stack-item {
  padding: 0 0 var(--space-4);
  border-bottom: 1px solid var(--border-soft);
}

.stack-item:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.stack-item p {
  margin-bottom: 0;
  color: var(--muted);
}

.media-figure {
  margin: 0;
}

.media-frame {
  padding: 1.25rem;
  border: 1px solid rgba(191, 183, 168, 0.5);
  border-radius: 1rem;
  background: var(--surface);
  box-shadow: 0 1rem 2.4rem rgba(31, 31, 26, 0.06);
}

.media-frame img {
  width: 100%;
}

.media-frame-wide {
  padding: 1.5rem;
}

.media-figure-framework {
  max-width: 24rem;
}

.media-figure-full {
  width: 100%;
  margin-top: var(--space-5);
}

.applications-notes {
  max-width: 39rem;
  margin-top: var(--space-5);
  margin-left: auto;
}

.media-figure figcaption {
  max-width: 34rem;
  margin-top: 0.9rem;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.media-figure-compact .media-frame img {
  max-height: 22rem;
  object-fit: cover;
}

/* Status and call to action */
.status-grid {
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.35fr);
}

.status-list {
  display: grid;
  gap: var(--space-3);
}

.status-item {
  padding: var(--space-4);
  background: rgba(251, 249, 244, 0.38);
}

.cta-panel {
  grid-template-columns: minmax(0, 1.4fr) auto;
  align-items: center;
  padding-top: 0.5rem;
}

.cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.9rem;
  padding: 0.75rem 1.15rem;
  border: 1px solid var(--accent);
  border-radius: 999px;
  color: var(--accent-deep);
  font-size: 0.94rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition);
}

.button-link:hover,
.button-link:focus-visible {
  background: rgba(102, 113, 91, 0.08);
  border-color: var(--accent-deep);
}

.button-link-secondary {
  border-color: var(--border);
  color: var(--text);
}

.button-link-secondary:hover,
.button-link-secondary:focus-visible {
  background: rgba(31, 31, 26, 0.04);
  border-color: var(--muted);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-soft);
  padding: var(--space-5) 0 var(--space-6);
}

.footer-row {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  color: rgba(93, 91, 82, 0.9);
  font-size: 0.96rem;
}

.footer-row p {
  margin: 0;
}

.footer-domain {
  font-size: 0.92rem;
  white-space: nowrap;
}

/* Responsive adjustments */
@media (max-width: 860px) {
  .feature-grid,
  .content-grid,
  .status-grid,
  .cta-panel,
  .card-grid,
  .link-grid,
  .resource-grid,
  .series-grid,
  .media-layout,
  .media-layout-reverse,
  .media-layout-framework {
    grid-template-columns: 1fr;
  }

  .cta-panel {
    align-items: start;
  }

  .hero-panel,
  .hero-panel-compact {
    max-width: none;
  }
}

@media (max-width: 640px) {
  .site-shell {
    width: min(calc(100% - 1.5rem), var(--page-width));
  }

  .site-nav,
  .footer-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-nav-links {
    gap: var(--space-3);
  }

  .hero {
    padding-top: var(--space-7);
    padding-bottom: var(--space-6);
  }

  .hero-panel {
    padding: 0;
  }

  .section {
    padding: var(--space-6) 0;
  }

  .button-link {
    width: 100%;
  }

  .cta-links {
    width: 100%;
  }
}