* {
  box-sizing: border-box;
}

:root {
  --ink: #121826;
  --navy: #17206a;
  --muted: #5d6675;
  --faint: #8a92a0;
  --paper: #ffffff;
  --canvas: #fbfaf7;
  --line: #e1ded6;
  --line-strong: #cbc6ba;
  --cream: #f6f2ea;
  --blue-soft: #eef1fb;
  --ok: #0f766e;
  --shadow: 0 18px 50px rgba(18, 24, 38, 0.07);
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, "Helvetica Neue", Arial, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--canvas);
  font-feature-settings: "tnum";
}

.topnav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
  padding: 18px max(22px, calc((100vw - 1120px) / 2 + 22px));
  border-bottom: 1px solid var(--line);
  background: rgba(251, 250, 247, 0.92);
  backdrop-filter: blur(14px);
}

.topnav div {
  display: flex;
  gap: 22px;
  align-items: center;
}

a {
  color: var(--navy);
  text-decoration: none;
  font-weight: 600;
  text-underline-offset: 4px;
}

a:hover {
  text-decoration: underline;
}

.topnav a {
  color: var(--navy);
  font-size: 0.84rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.topnav .brand {
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 750;
  letter-spacing: 0;
  text-transform: none;
}

main {
  width: min(1120px, calc(100vw - 36px));
  margin: 0 auto;
  padding: 34px 0 64px;
}

.hero {
  padding: 28px 42px 26px;
  border: 1px solid var(--line);
  background: var(--paper);
  border-radius: 8px;
  box-shadow: 0 12px 32px rgba(18, 24, 38, 0.04);
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--navy);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 0;
  color: var(--navy);
  font-family: "Helvetica Neue", Arial, ui-sans-serif, system-ui, sans-serif;
  font-size: clamp(1.05rem, 1.65vw, 1.4rem);
  font-style: normal;
  font-weight: 800;
  letter-spacing: 0.13em;
  line-height: 1.25;
  text-transform: uppercase;
}

h2 {
  margin-bottom: 18px;
  color: var(--ink);
  font-size: 1.05rem;
  font-weight: 750;
  letter-spacing: -0.01em;
}

h3 {
  margin-bottom: 9px;
  color: var(--navy);
  font-size: 0.95rem;
  font-weight: 700;
}

p,
li,
span {
  color: var(--muted);
  line-height: 1.55;
}

code {
  color: var(--navy);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92em;
}

.hero p {
  max-width: 680px;
  margin-bottom: 0;
  font-size: 1rem;
  line-height: 1.65;
}

section {
  margin-top: 22px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--line);
  border-radius: 8px;
}

.stats div {
  padding: 20px 22px;
  background: var(--paper);
}

.stats strong {
  display: block;
  margin-bottom: 5px;
  color: var(--navy);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2.2rem;
  font-weight: 400;
  line-height: 1;
}

.stats span {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 650;
}

.panel {
  padding: 26px 28px;
  border: 1px solid var(--line);
  background: var(--paper);
  border-radius: 8px;
  box-shadow: 0 12px 32px rgba(18, 24, 38, 0.04);
}

.panel.disclosure {
  padding: 0;
}

.panel.disclosure details {
  display: block;
}

.panel.disclosure summary {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: center;
  min-height: 84px;
  padding: 22px 26px;
  cursor: pointer;
  list-style: none;
}

.panel.disclosure summary::-webkit-details-marker {
  display: none;
}

.panel.disclosure summary h2 {
  margin-bottom: 5px;
}

.panel.disclosure summary p {
  max-width: 760px;
  margin-bottom: 0;
  font-size: 0.95rem;
}

.summary-action {
  flex: 0 0 auto;
  display: inline-grid;
  place-items: center;
  min-width: 78px;
  padding: 8px 11px;
  border: 1px solid var(--navy);
  color: var(--navy);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  border-radius: 999px;
}

.summary-action::before {
  content: "Open";
  color: var(--navy);
}

details[open] .summary-action::before {
  content: "Close";
}

.disclosure-body {
  padding: 0 26px 26px;
  border-top: 1px solid var(--line);
}

.disclosure-body > :first-child {
  margin-top: 22px;
}

.two-col {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  align-items: start;
}

.two-col > .panel {
  align-self: start;
}

.clean-list {
  display: grid;
  gap: 9px;
  margin: 0;
  padding-left: 20px;
}

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

.question-groups {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--line);
}

.question-groups > div {
  padding: 20px 20px 18px;
  background: #fffefa;
}

.question-groups ol {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 19px;
}

.design-table {
  display: grid;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--paper);
}

.design-table > div {
  display: grid;
  grid-template-columns: 1.03fr 0.9fr 1.35fr 1.35fr;
  border-top: 1px solid var(--line);
}

.design-table > div:first-child {
  border-top: 0;
}

.design-table span {
  padding: 14px 15px;
  border-left: 1px solid var(--line);
}

.design-table span:first-child {
  border-left: 0;
  color: var(--ink);
  font-weight: 760;
}

.design-table .table-head {
  background: var(--cream);
}

.design-table .table-head span {
  color: var(--navy);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.collection-notes {
  margin-top: 18px;
}

.compact-note {
  margin: 14px 0 0;
  font-size: 0.9rem;
}

.module-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.module-row > div,
.mini-stat {
  padding: 14px;
  border: 1px solid var(--line);
  background: #fffefa;
}

.module-row p {
  margin-bottom: 0;
}

.mini-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.mini-stat strong {
  display: block;
  color: var(--navy);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.5rem;
  font-weight: 400;
}

.mini-stat span {
  font-size: 0.85rem;
  font-weight: 650;
}

.section-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  margin-bottom: 14px;
}

.section-head h2 {
  margin-bottom: 0;
}

.viz-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 14px;
}

.viz-row a {
  display: grid;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  transition: transform 140ms ease, border-color 140ms ease, box-shadow 140ms ease;
}

.viz-row a:hover {
  transform: translateY(-2px);
  border-color: var(--navy);
  box-shadow: var(--shadow);
  text-decoration: none;
}

.viz-row img {
  width: 100%;
  height: 220px;
  object-fit: contain;
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.viz-row span {
  padding: 11px 13px;
  color: var(--navy);
  font-weight: 760;
}

@media (max-width: 840px) {
  .topnav,
  .section-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero {
    padding: 38px 28px 34px;
  }

  .stats,
  .two-col,
  .question-groups,
  .module-row,
  .mini-stats,
  .viz-row {
    grid-template-columns: 1fr;
  }

  .clean-list.compact {
    grid-template-columns: 1fr;
  }

  .design-table,
  .design-table > div,
  .design-table span {
    display: block;
  }

  .design-table > div {
    padding: 12px 14px;
  }

  .design-table span {
    padding: 4px 0;
    border-left: 0;
  }

  .design-table .table-head {
    display: none;
  }
}