:root {
  --ink: #0c2033;
  --ink-soft: #30465a;
  --paper: #f7f5f0;
  --white: #ffffff;
  --amber: #f2a23a;
  --amber-soft: #fff0d6;
  --blue: #176a78;
  --blue-soft: #dceef0;
  --line: #d7dfe4;
  --max: 1180px;
  --shadow: 0 24px 60px rgba(12, 32, 51, 0.12);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.66;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--amber);
  outline-offset: 4px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  padding: .7rem 1rem;
  background: var(--white);
  border-radius: .5rem;
}

.skip-link:focus { top: 1rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(247, 245, 240, .94);
  border-bottom: 1px solid rgba(12, 32, 51, .1);
  backdrop-filter: blur(14px);
}

.nav-shell {
  width: min(var(--max), calc(100% - 2rem));
  min-height: 78px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .75rem;
  text-decoration: none;
  font-weight: 850;
  letter-spacing: .14em;
}

.brand-mark {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  color: var(--white);
  background: var(--ink);
  border-radius: 50% 50% 50% 12%;
  font-family: Georgia, serif;
  font-size: 1.15rem;
  letter-spacing: 0;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.site-nav a {
  text-decoration: none;
  color: var(--ink-soft);
  font-size: .92rem;
  font-weight: 700;
}

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

.menu-button {
  display: none;
  border: 1px solid var(--line);
  background: var(--white);
  border-radius: 999px;
  padding: .55rem .9rem;
  font: inherit;
  font-weight: 750;
}

.hero {
  position: relative;
  overflow: hidden;
  color: var(--white);
  background:
    radial-gradient(circle at 88% 20%, rgba(242, 162, 58, .22), transparent 26rem),
    linear-gradient(135deg, #071827 0%, #103c4a 100%);
}

.hero::after {
  content: "";
  position: absolute;
  right: -9rem;
  bottom: -15rem;
  width: 34rem;
  height: 34rem;
  border: 1px solid rgba(255, 255, 255, .14);
  border-radius: 50%;
  box-shadow: 0 0 0 4rem rgba(255,255,255,.025), 0 0 0 8rem rgba(255,255,255,.02);
}

.hero-grid,
.page-hero-inner,
.section-inner,
.site-footer-inner {
  width: min(var(--max), calc(100% - 2rem));
  margin: 0 auto;
}

.hero-grid {
  position: relative;
  z-index: 1;
  min-height: 640px;
  padding: 7.5rem 0 5.5rem;
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(260px, .55fr);
  align-items: end;
  gap: 4rem;
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--amber);
  font-size: .8rem;
  font-weight: 850;
  letter-spacing: .18em;
  text-transform: uppercase;
}

h1, h2, h3 {
  margin-top: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 500;
  line-height: 1.08;
}

h1 {
  max-width: 920px;
  margin-bottom: 1.5rem;
  font-size: clamp(3rem, 7vw, 6.6rem);
  letter-spacing: -.045em;
}

h2 {
  margin-bottom: 1.25rem;
  font-size: clamp(2.1rem, 4vw, 3.65rem);
  letter-spacing: -.035em;
}

h3 {
  margin-bottom: .65rem;
  font-size: 1.42rem;
}

.lead {
  max-width: 760px;
  margin: 0;
  color: rgba(255,255,255,.82);
  font-size: clamp(1.08rem, 1.5vw, 1.28rem);
}

.hero-aside {
  padding: 1.5rem 0 0 1.5rem;
  border-left: 2px solid var(--amber);
}

.hero-aside p {
  margin: 0 0 1rem;
  color: rgba(255,255,255,.75);
}

.hero-aside strong {
  display: block;
  color: var(--white);
  font-size: 1.05rem;
}

.actions {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: .8rem;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: .75rem 1.1rem;
  border: 1px solid transparent;
  border-radius: 999px;
  text-decoration: none;
  font-size: .92rem;
  font-weight: 800;
}

.button-primary { color: var(--ink); background: var(--amber); }
.button-secondary { color: var(--white); border-color: rgba(255,255,255,.35); }

.section { padding: 6.5rem 0; }
.section-white { background: var(--white); }
.section-dark { color: var(--white); background: var(--ink); }

.section-head {
  display: grid;
  grid-template-columns: .75fr 1.25fr;
  align-items: start;
  gap: 3rem;
  margin-bottom: 3rem;
}

.section-intro {
  max-width: 700px;
  margin: .3rem 0 0;
  color: var(--ink-soft);
  font-size: 1.08rem;
}

.section-dark .section-intro { color: rgba(255,255,255,.72); }

.question-panel {
  display: grid;
  grid-template-columns: 5rem 1fr;
  gap: 1.5rem;
  padding: clamp(1.5rem, 4vw, 3rem);
  background: var(--amber-soft);
  border-top: 5px solid var(--amber);
  box-shadow: var(--shadow);
}

.question-number {
  font-family: Georgia, serif;
  font-size: 3.6rem;
  line-height: 1;
  color: var(--blue);
}

.question-panel blockquote {
  margin: 0;
  max-width: 900px;
  font-family: Georgia, serif;
  font-size: clamp(1.65rem, 3vw, 2.6rem);
  line-height: 1.25;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.2rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.2rem;
}

.card {
  position: relative;
  min-height: 250px;
  padding: 1.75rem;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 1rem;
}

.card::before {
  content: "";
  display: block;
  width: 42px;
  height: 4px;
  margin-bottom: 1.5rem;
  background: var(--amber);
}

.card p { margin-bottom: 0; color: var(--ink-soft); }

.card-link {
  display: inline-block;
  margin-top: 1rem;
  color: var(--blue);
  font-weight: 800;
  text-underline-offset: .25rem;
}

.feature-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.2rem;
}

.feature {
  padding: 2rem;
  color: var(--white);
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 1rem;
}

.feature p { color: rgba(255,255,255,.72); }

.page-hero {
  color: var(--white);
  background: linear-gradient(130deg, #071827, #12505b);
}

.page-hero-inner { padding: 6.5rem 0 5rem; }

.page-hero h1 {
  max-width: 1040px;
  font-size: clamp(2.8rem, 6vw, 5.4rem);
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(220px, .65fr) minmax(0, 1.35fr);
  gap: 4rem;
}

.sticky-index {
  position: sticky;
  top: 110px;
  align-self: start;
  padding-top: .5rem;
}

.sticky-index p {
  margin: 0 0 .45rem;
  color: var(--ink-soft);
}

.sticky-index strong { color: var(--ink); }

.prose { max-width: 800px; }
.prose h2 { margin-top: 3.6rem; font-size: clamp(2rem, 3vw, 2.8rem); }
.prose h2:first-child { margin-top: 0; }
.prose p { color: var(--ink-soft); }

.timeline {
  margin: 2rem 0;
  border-left: 2px solid var(--line);
}

.timeline-item {
  position: relative;
  padding: 0 0 2rem 2rem;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: .45rem;
  width: 12px;
  height: 12px;
  background: var(--amber);
  border-radius: 50%;
}

.timeline-item h3 { margin-bottom: .35rem; }
.timeline-item p { margin: 0; }

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  padding: 0;
  list-style: none;
}

.tag-list li {
  padding: .45rem .75rem;
  color: var(--blue);
  background: var(--blue-soft);
  border-radius: 999px;
  font-size: .88rem;
  font-weight: 750;
}

.publication {
  padding: 2rem 0;
  border-top: 1px solid var(--line);
}

.publication:first-of-type { border-top: 0; }
.publication-meta { color: var(--blue); font-size: .88rem; font-weight: 800; letter-spacing: .04em; }

.site-footer {
  color: rgba(255,255,255,.72);
  background: #06131f;
}

.site-footer-inner {
  padding: 3rem 0;
  display: flex;
  justify-content: space-between;
  gap: 2rem;
}

.site-footer strong { display: block; color: var(--white); }
.site-footer p { margin: .35rem 0 0; }
.site-footer a { color: var(--white); }

.footer-links {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-links a {
  color: rgba(255,255,255,.82);
  text-decoration: none;
  font-size: .9rem;
  font-weight: 700;
}

.footer-links a:hover { color: var(--white); }

@media (max-width: 900px) {
  .menu-button { display: inline-flex; }
  .site-nav {
    display: none;
    position: absolute;
    left: 1rem;
    right: 1rem;
    top: 70px;
    padding: 1rem;
    flex-direction: column;
    align-items: stretch;
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 1rem;
    box-shadow: var(--shadow);
  }
  .site-nav[data-open] { display: flex; }
  .site-nav a { padding: .55rem; }
  .hero-grid,
  .section-head,
  .content-grid { grid-template-columns: 1fr; }
  .hero-grid { min-height: auto; padding: 5rem 0; gap: 2.5rem; }
  .hero-aside { max-width: 520px; }
  .grid-3,
  .grid-4 { grid-template-columns: 1fr; }
  .card { min-height: auto; }
  .sticky-index { position: static; }
}

@media (max-width: 620px) {
  body { font-size: 16px; }
  .brand { font-size: .88rem; }
  .brand-mark { width: 36px; height: 36px; }
  .section { padding: 4.5rem 0; }
  .question-panel { grid-template-columns: 1fr; }
  .question-number { font-size: 2.5rem; }
  .feature-row { grid-template-columns: 1fr; }
  .site-footer-inner { flex-direction: column; }
  .footer-links { align-items: flex-start; }
}

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