:root {
  color-scheme: light;
  --bg: #f6f8f8;
  --paper: #ffffff;
  --paper-soft: #eef4f2;
  --ink: #14201e;
  --muted: #5d6a67;
  --faint: #8a9693;
  --line: #d7e0dd;
  --accent: #0b5f57;
  --accent-strong: #073f3a;
  --gold: #a77924;
  --shadow: 0 22px 52px rgba(14, 28, 25, 0.12);
  --control-height: 38px;
  --max: 1280px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 13px clamp(18px, 5vw, 72px);
  background: rgba(246, 248, 248, 0.93);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  color: var(--ink);
  font-size: 15px;
  font-weight: 820;
  text-decoration: none;
}

.brand-mark {
  display: inline-grid;
  width: 58px;
  height: 34px;
  place-items: center;
  flex: 0 0 58px;
  border-radius: 7px;
  background: var(--accent);
  color: #ffffff;
  font-size: 11px;
  font-weight: 850;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 18px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 720;
}

.site-nav a {
  text-decoration: none;
}

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

.hero {
  display: grid;
  grid-template-columns: minmax(760px, 1.2fr) minmax(360px, 0.8fr);
  gap: clamp(24px, 3vw, 40px);
  align-items: center;
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(58px, 8vw, 104px) clamp(18px, 5vw, 36px) clamp(46px, 7vw, 78px);
}

.hero-copy {
  min-width: 0;
}

.eyebrow {
  margin: 0 0 11px;
  color: var(--accent);
  font-size: 15px;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(40px, 5vw, 60px);
  line-height: 1.04;
  letter-spacing: 0;
}

h2 {
  max-width: 780px;
  margin: 0;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.1;
  letter-spacing: 0;
}

h3 {
  margin: 14px 0 8px;
  font-size: 19px;
  line-height: 1.25;
  letter-spacing: 0;
}

.hero-lead {
  max-width: 690px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: clamp(18px, 2vw, 21px);
}

.author-block {
  max-width: 690px;
  margin: 18px 0 0;
}

.authors {
  margin: 0;
  color: var(--accent-strong);
  font-size: 15px;
  font-weight: 720;
}

.authors a {
  color: inherit;
  text-decoration-color: rgba(7, 63, 58, 0.35);
  text-underline-offset: 3px;
}

.authors a:hover,
.authors a:focus-visible {
  text-decoration-color: currentColor;
}

.authors sup,
.affiliations sup {
  font-size: 0.72em;
  line-height: 0;
}

.affiliations {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.hero-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 24px;
}

.hero-badges {
  display: inline-flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: 8px;
}

.badge-chip {
  display: inline-flex;
  height: var(--control-height);
  align-items: center;
  justify-content: center;
  padding: 0 1px;
  text-decoration: none;
}

.badge-chip img {
  display: block;
  height: 22px;
  width: auto;
}

.button {
  display: inline-flex;
  min-height: var(--control-height);
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  border: 1px solid var(--accent);
  border-radius: 7px;
  font-size: 14.5px;
  font-weight: 760;
  line-height: 1;
  text-decoration: none;
}

.button.primary {
  background: var(--accent);
  color: #ffffff;
}

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

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

.hero-visual {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1800 / 782;
  object-fit: contain;
}

.hero-visual figcaption {
  margin: 0;
  padding: 11px 14px 13px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

.paper-figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: 0 16px 40px rgba(14, 28, 25, 0.08);
}

.paper-figure img {
  display: block;
  width: 100%;
  height: auto;
}

.paper-figure figcaption {
  margin: 0;
  padding: 13px 16px 15px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

.section {
  display: grid;
  gap: 22px;
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(56px, 7vw, 84px) clamp(18px, 5vw, 36px);
  border-bottom: 1px solid var(--line);
}

.section-header {
  min-width: 0;
}

.section-title {
  margin-bottom: 0;
}

.prose {
  max-width: 980px;
}

.prose p,
.feature-grid p,
.resource-note,
.citation-note {
  color: var(--muted);
}

.prose p {
  margin: 0;
  font-size: 17px;
}

.prose p + p {
  margin-top: 16px;
}

.feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.feature-grid article {
  min-height: 0;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

.feature-grid span {
  color: var(--gold);
  font-size: 13px;
  font-weight: 850;
}

.feature-grid p {
  margin: 0;
}

.pdf-preview {
  display: grid;
  gap: 16px;
}

.pdf-frame {
  overflow: hidden;
  height: min(72vh, 760px);
  min-height: 520px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: 0 16px 40px rgba(14, 28, 25, 0.08);
}

.pdf-frame iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

.resource-note,
.citation-note {
  max-width: 980px;
  margin: 0;
  font-size: 16px;
}

pre {
  overflow-x: auto;
  max-width: 100%;
  margin: 0;
  padding: 20px;
  border: 1px solid #1d302c;
  border-radius: 8px;
  background: #14201e;
  color: #f3f7f5;
  font-size: 13px;
  line-height: 1.55;
}

.site-footer {
  display: grid;
  gap: 8px;
  padding: 30px clamp(18px, 5vw, 72px);
  color: var(--muted);
  text-align: center;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  color: var(--accent-strong);
  font-weight: 750;
}

@media (max-width: 1180px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-nav {
    justify-content: flex-start;
  }

  .hero,
  .section {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 42px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .pdf-frame {
    min-height: 460px;
  }
}

@media (max-width: 520px) {
  .brand {
    font-size: 14px;
  }

  .site-nav {
    gap: 12px;
    font-size: 13px;
  }

  h1 {
    font-size: 38px;
  }

  .hero-toolbar {
    align-items: stretch;
  }

  .hero-badges {
    flex-wrap: wrap;
    width: 100%;
  }

  .button {
    width: 100%;
  }
}