:root {
  color-scheme: light;
  --font-display: "Bodoni 72", "Didot", "Garamond", "Times New Roman", serif;
  --font-serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, "Georgia", serif;
  --font-sans: "Avenir Next", "Gill Sans", "Trebuchet MS", "Verdana", sans-serif;
  --ink: #1b2430;
  --ink-soft: #324155;
  --accent: #0f766e;
  --accent-strong: #115e59;
  --accent-warm: #c2410c;
  --paper: #f8f4ee;
  --paper-deep: #f1e5d3;
  --mist: #e7dfd3;
  --line: #dcccb7;
  --shadow: 0 18px 60px rgba(27, 36, 48, 0.08);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --max-width: 1100px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-serif);
  color: var(--ink);
  line-height: 1.65;
  background: linear-gradient(135deg, #f6f2ea 0%, #fdfaf5 40%, #f2ece1 100%);
  min-height: 100vh;
  position: relative;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: radial-gradient(circle at 20% 20%, rgba(15, 118, 110, 0.08), transparent 40%),
    radial-gradient(circle at 80% 10%, rgba(194, 65, 12, 0.08), transparent 45%),
    radial-gradient(circle at 15% 80%, rgba(27, 36, 48, 0.06), transparent 50%);
  pointer-events: none;
  z-index: -1;
}

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

a {
  color: var(--accent-strong);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

p {
  margin: 0 0 1rem;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: 0.2px;
  color: #131b24;
  margin: 0 0 0.6rem;
}

h1 {
  font-size: clamp(2.4rem, 3vw + 1.4rem, 4.1rem);
}

h2 {
  font-size: clamp(1.7rem, 1.5vw + 1.2rem, 2.4rem);
  margin-top: 2.6rem;
}

h3 {
  font-size: clamp(1.2rem, 1vw + 1rem, 1.6rem);
  margin-top: 2rem;
}

small {
  font-family: var(--font-sans);
  color: var(--ink-soft);
}

.container {
  width: min(100% - 2.5rem, var(--max-width));
  margin: 0 auto;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 1rem;
  background: var(--accent);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 999px;
  z-index: 10;
}

.skip-link:focus-visible {
  left: 1rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  backdrop-filter: blur(12px);
  background: rgba(248, 244, 238, 0.9);
  border-bottom: 1px solid var(--mist);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.2rem 0;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: var(--ink);
}

.brand img {
  width: 38px;
  height: 38px;
}

.nav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
  font-family: var(--font-sans);
  font-size: 0.95rem;
}

.nav a {
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  border: 1px solid transparent;
  color: var(--ink-soft);
}

.nav a[aria-current="page"],
.nav a:hover,
.nav a:focus-visible {
  border-color: var(--mist);
  color: var(--ink);
  background: rgba(255, 255, 255, 0.7);
}

.hero {
  padding: 4rem 0 3rem;
}

.hero-grid {
  display: grid;
  gap: 2.5rem;
  align-items: center;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.hero-card {
  background: rgba(255, 255, 255, 0.9);
  padding: 2rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--mist);
}

.eyebrow {
  font-family: var(--font-sans);
  text-transform: uppercase;
  letter-spacing: 2px;
  font-size: 0.72rem;
  color: var(--accent);
  margin-bottom: 0.6rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 1.6rem;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  border-radius: 999px;
  border: 1px solid var(--accent-strong);
  color: white;
  background: var(--accent-strong);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(15, 118, 110, 0.2);
}

.button.secondary {
  background: transparent;
  color: var(--accent-strong);
}

.metrics {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  margin-top: 1.5rem;
}

.metric {
  padding: 1rem 1.2rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--mist);
  background: #fff7ea;
  font-family: var(--font-sans);
}

.section {
  padding: 2rem 0 3rem;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.search {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: white;
  border: 1px solid var(--mist);
  border-radius: 999px;
  padding: 0.6rem 1rem;
  min-width: 260px;
}

.search input {
  border: none;
  outline: none;
  font-family: var(--font-sans);
  width: 100%;
  background: transparent;
}

.topic-grid {
  display: grid;
  gap: 1.6rem;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.topic-card {
  background: white;
  padding: 1.6rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--mist);
  box-shadow: var(--shadow);
  display: grid;
  gap: 0.8rem;
}

.topic-card h3 {
  margin-top: 0;
}

.topic-card .tag {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent-warm);
}

.topic-card .meta {
  font-family: var(--font-sans);
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.topic-card a {
  font-family: var(--font-sans);
  font-weight: 600;
}

.topic-empty {
  display: none;
  margin-top: 1rem;
  font-family: var(--font-sans);
  color: var(--ink-soft);
}

.topic-empty.is-visible {
  display: block;
}

.content-grid {
  display: grid;
  gap: 2.5rem;
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 980px) {
  .content-grid {
    grid-template-columns: minmax(0, 2.5fr) minmax(0, 1fr);
    align-items: start;
  }
}

.prose {
  background: white;
  border-radius: var(--radius-lg);
  padding: 2rem;
  border: 1px solid var(--mist);
  box-shadow: var(--shadow);
}

.prose ul,
.prose ol {
  padding-left: 1.2rem;
  margin: 0 0 1.2rem;
}

.prose li {
  margin-bottom: 0.5rem;
}

.callout {
  margin: 1.5rem 0;
  padding: 1.2rem 1.4rem;
  border-radius: var(--radius-sm);
  background: #f7efe1;
  border-left: 4px solid var(--accent-warm);
}

.toc {
  position: relative;
  padding: 1.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--mist);
  background: rgba(255, 255, 255, 0.85);
  font-family: var(--font-sans);
}

@media (min-width: 980px) {
  .toc {
    position: sticky;
    top: 100px;
  }
}

.toc h3 {
  margin-top: 0;
  font-family: var(--font-display);
}

.toc ol {
  padding-left: 1.2rem;
  margin: 0;
}

.key-points {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
  display: grid;
  gap: 0.8rem;
}

.key-points li {
  background: #fef8ee;
  border: 1px solid var(--mist);
  border-radius: var(--radius-sm);
  padding: 0.8rem 0.9rem;
}

.figure {
  margin: 1.8rem 0;
}

.figure figcaption {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin-top: 0.6rem;
}

.site-footer {
  margin-top: 3rem;
  padding: 2.5rem 0 3rem;
  border-top: 1px solid var(--mist);
  background: rgba(255, 255, 255, 0.6);
}

.footer-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  font-family: var(--font-sans);
}

.footer-grid a {
  color: var(--ink);
}

.footer-note {
  margin-top: 2rem;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.fade-up {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.is-revealed {
  opacity: 1;
  transform: translateY(0);
}

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

  .fade-up {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .button {
    transition: none;
  }
}