:root {
  --paper: #f4efe6;
  --paper-strong: #ebe4d7;
  --ink: #10161c;
  --ink-soft: #42505b;
  --line: rgba(16, 22, 28, 0.14);
  --line-strong: rgba(16, 22, 28, 0.28);
  --accent: #0b5f7a;
  --accent-soft: rgba(11, 95, 122, 0.12);
  --panel: rgba(255, 255, 255, 0.72);
  --shadow: 0 18px 50px rgba(16, 22, 28, 0.08);
  --radius-lg: 32px;
  --radius-md: 22px;
  --radius-sm: 14px;
  --max-width: 1180px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top right, rgba(11, 95, 122, 0.16), transparent 30%),
    linear-gradient(180deg, #f8f4ec 0%, #f1eadf 48%, #ebe6da 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(16, 22, 28, 0.045) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(16, 22, 28, 0.04) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.4), transparent 82%);
}

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

a {
  color: inherit;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  z-index: 20;
  padding: 0.75rem 1rem;
  border-radius: 999px;
  background: var(--ink);
  color: #fff;
  text-decoration: none;
}

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

.page-shell {
  width: min(calc(100% - 2rem), var(--max-width));
  margin: 1rem auto 2rem;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1rem;
  padding: 1rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(248, 244, 236, 0.85);
  backdrop-filter: blur(18px);
  transition: box-shadow 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.topbar.is-scrolled {
  box-shadow: 0 14px 36px rgba(16, 22, 28, 0.12);
  border-color: rgba(16, 22, 28, 0.2);
}

.brand {
  flex: 0 1 360px;
}

.brand img {
  width: min(100%, 320px);
  height: auto;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.45rem;
}

.nav a {
  padding: 0.7rem 1rem;
  border-radius: 999px;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.92rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav a.is-active,
.nav a:hover,
.nav a:focus-visible {
  color: var(--ink);
  background: rgba(16, 22, 28, 0.06);
  outline: none;
}

.section {
  position: relative;
  margin-top: 1.5rem;
  padding: clamp(1.5rem, 3vw, 2.5rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.54);
  box-shadow: var(--shadow);
  overflow: clip;
}

.section::after {
  content: "";
  position: absolute;
  inset: auto -12% -20% 40%;
  height: 160px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(11, 95, 122, 0.09), transparent 72%);
  pointer-events: none;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.9fr);
  gap: 1.5rem;
  align-items: stretch;
  min-height: 72vh;
}

.hero-copy,
.hero-panel {
  position: relative;
  z-index: 1;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.5rem;
  padding-right: 1.5rem;
}

.eyebrow,
.panel-label,
.card-index,
.criteria-step,
.example-tag,
.source-date,
.panel-kicker {
  margin: 0;
  font-family: "SFMono-Regular", "IBM Plex Mono", monospace;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  font-size: 0.78rem;
}

h1,
h2,
h3,
.footer-title,
.panel-title {
  margin: 0;
  font-family: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", serif;
  font-weight: 600;
  line-height: 0.98;
  letter-spacing: -0.04em;
}

h1 {
  font-size: clamp(3.2rem, 7vw, 6.8rem);
  max-width: 9ch;
}

h2 {
  font-size: clamp(2.1rem, 4vw, 3.5rem);
  max-width: 12ch;
}

h3,
.panel-title,
.footer-title {
  font-size: clamp(1.35rem, 2vw, 1.95rem);
}

p {
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.7;
}

.hero-dek {
  max-width: 60ch;
  font-size: 1.08rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.2rem;
  padding: 0.8rem 1.35rem;
  border-radius: 999px;
  border: 1px solid transparent;
  text-decoration: none;
  font-weight: 600;
}

.button-primary {
  background: var(--ink);
  color: #fff;
}

.button-secondary {
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.5);
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
  outline: none;
}

.hero-note {
  display: grid;
  gap: 0.75rem;
}

.note-pill {
  display: inline-flex;
  width: fit-content;
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: "SFMono-Regular", "IBM Plex Mono", monospace;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.note-copy {
  max-width: 56ch;
}

.hero-panel {
  display: grid;
  gap: 1.25rem;
  align-content: start;
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.88), rgba(235, 228, 215, 0.72)),
    var(--panel);
}

.hero-panel::before {
  content: "";
  position: absolute;
  inset: 1rem;
  border: 1px solid rgba(11, 95, 122, 0.18);
  border-radius: calc(var(--radius-lg) - 8px);
  pointer-events: none;
}

.panel-brand {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.panel-brand img {
  width: 96px;
  height: 96px;
  filter: drop-shadow(0 12px 22px rgba(16, 22, 28, 0.1));
}

.panel-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
}

.panel-grid article,
.criteria-card,
.example-card,
.source-link-card,
.faq-item,
.definition-card {
  position: relative;
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.54);
}

.panel-grid article::before,
.criteria-card::before,
.example-card::before,
.source-link-card::before,
.faq-item::before,
.definition-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, rgba(11, 95, 122, 0.18), transparent 45%);
  -webkit-mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.section-heading {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 0.6rem;
  margin-bottom: 1.4rem;
}

.section-copy {
  max-width: 62ch;
}

.split-section .section-heading {
  margin-bottom: 1.6rem;
}

.definition-layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.source-card {
  grid-column: span 3;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  background: linear-gradient(135deg, rgba(11, 95, 122, 0.08), rgba(255, 255, 255, 0.6));
}

.source-card a,
.source-link-card a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

.criteria-grid,
.example-grid,
.sources-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

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

.criteria-step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  border: 1px solid rgba(11, 95, 122, 0.25);
  background: rgba(11, 95, 122, 0.08);
  color: var(--accent);
}

.faq-list {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 0.9rem;
}

.faq-question {
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  text-align: left;
  color: var(--ink);
  font: inherit;
  font-family: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", serif;
  font-size: clamp(1.2rem, 2vw, 1.6rem);
  line-height: 1.2;
  letter-spacing: -0.03em;
  cursor: pointer;
}

.faq-question::after {
  content: "+";
  float: right;
  color: var(--accent);
  font-family: "SFMono-Regular", "IBM Plex Mono", monospace;
}

.faq-question[aria-expanded="true"]::after {
  content: "−";
}

.faq-answer {
  padding-top: 1rem;
  max-width: 70ch;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  margin: 1.5rem 0 2.5rem;
  padding: 1.5rem 1.25rem 0;
  border-top: 1px solid var(--line);
}

.footer-meta {
  text-align: right;
}

@media (max-width: 1000px) {
  .topbar {
    border-radius: 28px;
    align-items: flex-start;
    flex-direction: column;
  }

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

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .hero-copy {
    padding-right: 0;
  }

  .definition-layout,
  .criteria-grid,
  .sources-grid {
    grid-template-columns: 1fr;
  }

  .source-card {
    grid-column: auto;
    align-items: flex-start;
    flex-direction: column;
  }

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

@media (max-width: 720px) {
  .page-shell {
    width: min(calc(100% - 1rem), var(--max-width));
    margin-top: 0.5rem;
  }

  .topbar {
    padding: 1rem;
  }

  .section {
    padding: 1.2rem;
    border-radius: 24px;
  }

  h1 {
    max-width: 100%;
  }

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

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .site-footer {
    flex-direction: column;
    padding-inline: 0.3rem;
  }

  .footer-meta {
    text-align: left;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}