:root {
  color-scheme: light;
  --ink: #27233c;
  --ink-soft: #625e75;
  --paper: #f7f3ea;
  --paper-deep: #eee7d9;
  --card: rgba(255, 253, 248, 0.82);
  --indigo: #474166;
  --indigo-soft: #77708f;
  --sun: #d29d4a;
  --rose: #a45551;
  --mint: #66877c;
  --line: rgba(71, 65, 102, 0.17);
  --shadow: 0 24px 70px rgba(55, 47, 73, 0.1);
  --radius: 28px;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 7%, rgba(208, 173, 113, 0.18), transparent 28rem),
    radial-gradient(circle at 92% 18%, rgba(121, 111, 150, 0.14), transparent 30rem),
    linear-gradient(180deg, #faf7f0 0%, var(--paper) 46%, #f3eee4 100%);
  line-height: 1.58;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.3;
  background-image: radial-gradient(rgba(54, 47, 75, 0.25) 0.55px, transparent 0.55px);
  background-size: 18px 18px;
  mask-image: linear-gradient(to bottom, black, transparent 45%);
}

a { color: inherit; }

button, a { -webkit-tap-highlight-color: transparent; }

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

.skip-link {
  position: fixed;
  left: 1rem;
  top: 1rem;
  z-index: 30;
  transform: translateY(-180%);
  padding: 0.7rem 1rem;
  border-radius: 999px;
  background: var(--ink);
  color: white;
}

.skip-link:focus { transform: translateY(0); }

.site-header,
main,
footer {
  width: min(1180px, calc(100% - 40px));
  margin-inline: auto;
}

.site-header {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 26px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  font-weight: 720;
  letter-spacing: -0.02em;
}

.brand-mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.35);
}

.brand-mark span {
  position: absolute;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--indigo);
}

.brand-mark span:nth-child(1) { transform: translate(-7px, 5px); }
.brand-mark span:nth-child(2) { transform: translate(1px, -7px); background: var(--sun); }
.brand-mark span:nth-child(3) { transform: translate(8px, 6px); background: var(--rose); }

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.78rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-soft);
  background: rgba(255, 253, 248, 0.62);
  font-size: 0.78rem;
  font-weight: 650;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 4px rgba(102, 135, 124, 0.12);
}

.hero {
  position: relative;
  padding: clamp(76px, 11vw, 142px) 0 clamp(72px, 9vw, 112px);
  text-align: center;
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  left: 50%;
  border-radius: 50%;
  transform: translateX(-50%);
  pointer-events: none;
}

.hero::before {
  top: 24px;
  width: min(640px, 72vw);
  aspect-ratio: 1;
  border: 1px solid rgba(71, 65, 102, 0.08);
}

.hero::after {
  top: 72px;
  width: min(530px, 62vw);
  aspect-ratio: 1;
  border: 1px solid rgba(210, 157, 74, 0.11);
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--rose);
  font-size: 0.72rem;
  font-weight: 780;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

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

h1, h2, h3 {
  font-family: Iowan Old Style, Baskerville, "Times New Roman", serif;
  font-weight: 520;
  letter-spacing: -0.035em;
  line-height: 1.08;
}

h1 {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
  font-size: clamp(3rem, 8.5vw, 7.1rem);
}

h1 em {
  color: var(--indigo-soft);
  font-weight: 420;
}

.hero-copy {
  position: relative;
  z-index: 1;
  max-width: 650px;
  margin: 2rem auto 0;
  color: var(--ink-soft);
  font-size: clamp(1rem, 2vw, 1.18rem);
}

.hero-boundary {
  position: relative;
  z-index: 1;
  display: flex;
  width: fit-content;
  margin: 2rem auto 0;
  align-items: center;
  gap: 0.7rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 253, 248, 0.68);
  color: var(--ink-soft);
  font-size: 0.8rem;
}

.hero-boundary strong { color: var(--rose); }

.snapshot-note {
  position: relative;
  z-index: 1;
  display: flex;
  width: min(720px, 100%);
  margin: 1rem auto 0;
  align-items: baseline;
  justify-content: center;
  gap: 0.7rem;
  color: var(--ink-soft);
  font-size: 0.72rem;
}

.snapshot-note strong {
  color: var(--ink);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.study-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 310px;
  gap: 24px;
  align-items: start;
}

.study-main,
.authority-card,
.negative-space,
.artifact-note,
.next-study {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.study-main { padding: clamp(24px, 4vw, 42px); }

.section-heading {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  align-items: end;
  margin-bottom: 2rem;
}

.section-heading h2,
.negative-intro h2,
.next-study > h2 {
  margin-bottom: 0;
  font-size: clamp(2rem, 4vw, 3.35rem);
}

.scope-note {
  flex: 0 0 auto;
  margin-bottom: 0.28rem;
  color: var(--ink-soft);
  font-size: 0.79rem;
}

.chart-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.45);
}

.chart-intro {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 18px 20px 0;
  color: var(--ink-soft);
  font-size: 0.78rem;
}

.chart-intro p { max-width: 560px; margin-bottom: 0; }

.legend {
  display: flex;
  flex: 0 0 auto;
  flex-direction: column;
  gap: 0.25rem;
  white-space: nowrap;
}
.legend span { display: inline-flex; align-items: center; }
.legend i {
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 0.35rem;
  border-radius: 50%;
  background: var(--indigo-soft);
}
.legend .context-key { background: var(--indigo-soft); }
.legend .detail-key {
  border: 2px solid var(--indigo);
  background: var(--paper);
}

.chart-wrap { padding: 0 8px; }
.chart-wrap svg { display: block; width: 100%; height: auto; }

.chart-grid { stroke: rgba(71, 65, 102, 0.1); stroke-width: 1; }
.chart-axis { stroke: rgba(71, 65, 102, 0.28); stroke-width: 1; }
.chart-label {
  fill: var(--ink-soft);
  font-family: Inter, ui-sans-serif, sans-serif;
  font-size: 11px;
}
.chart-error { stroke: var(--indigo-soft); stroke-width: 1.2; }
.chart-error.detailed { stroke: var(--indigo); stroke-width: 1.8; }
.chart-point {
  cursor: default;
  fill: var(--indigo-soft);
  stroke: none;
  transition: r 120ms ease, fill 120ms ease;
}
.chart-point.detailed {
  fill: var(--paper);
  stroke: var(--indigo);
  stroke-width: 2.2;
}
.chart-point.selected { fill: var(--sun); stroke: var(--ink); }

.chart-inset {
  fill: rgba(255, 253, 248, 0.96);
  stroke: rgba(71, 65, 102, 0.2);
  stroke-width: 1;
}
.chart-inset-axis { stroke: rgba(71, 65, 102, 0.22); stroke-width: 1; }
.chart-inset-label,
.chart-inset-tick {
  fill: var(--ink-soft);
  font-family: Inter, ui-sans-serif, sans-serif;
  font-size: 8.5px;
}
.chart-inset-label { font-weight: 680; }
.inset-error { stroke-width: 0.9; }

.chart-caution {
  margin: 0;
  padding: 14px 20px 17px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  background: rgba(210, 157, 74, 0.06);
  font-size: 0.78rem;
}

.context-table {
  margin-top: 12px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.3);
}

.context-table summary {
  cursor: pointer;
  padding: 14px 16px;
  color: var(--ink);
  font-size: 0.78rem;
  font-weight: 700;
}

.table-wrap {
  max-height: 420px;
  overflow: auto;
  border-top: 1px solid var(--line);
}

.context-table table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.7rem;
  text-align: left;
}

.context-table caption {
  padding: 12px 14px;
  color: var(--ink-soft);
  text-align: left;
}

.context-table th,
.context-table td {
  padding: 10px 12px;
  border-top: 1px solid rgba(71, 65, 102, 0.09);
  white-space: nowrap;
}

.context-table thead th {
  position: sticky;
  top: 0;
  z-index: 1;
  color: var(--ink-soft);
  background: #f8f5ed;
  font-size: 0.64rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.context-table tbody th { color: var(--ink); font-weight: 720; }
.context-table tbody tr:nth-child(even) { background: rgba(71, 65, 102, 0.025); }
.context-table a { font-weight: 680; }

.detail-label {
  margin: 18px 0 0;
  color: var(--ink-soft);
  font-size: 0.7rem;
  font-weight: 740;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.observation-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-top: 12px;
}

.observation-button {
  padding: 13px 14px;
  border: 1px solid var(--line);
  border-radius: 16px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.38);
  text-align: left;
  cursor: pointer;
}

.observation-button:hover,
.observation-button[aria-pressed="true"] {
  border-color: rgba(71, 65, 102, 0.46);
  background: rgba(255, 255, 255, 0.74);
}

.observation-button:focus-visible {
  border-color: var(--indigo);
  background: rgba(255, 255, 255, 0.82);
}

.observation-button small,
.observation-button strong { display: block; }
.observation-button small { color: var(--ink-soft); font-size: 0.68rem; }
.observation-button strong { margin-top: 0.15rem; font-size: 0.9rem; }

.inspection {
  min-height: 190px;
  margin-top: 12px;
  padding: 24px;
  border: 1px dashed rgba(71, 65, 102, 0.24);
  border-radius: 20px;
  background: rgba(247, 243, 234, 0.48);
}

.inspection-empty {
  display: flex;
  min-height: 140px;
  align-items: center;
  justify-content: center;
  gap: 1.3rem;
  color: var(--ink-soft);
}

.inspection-empty h3 { margin-bottom: 0.5rem; color: var(--ink); font-size: 1.45rem; }
.inspection-empty p:last-child { margin-bottom: 0; font-size: 0.85rem; }

.inspection-orbit {
  position: relative;
  flex: 0 0 auto;
  width: 48px;
  height: 48px;
  border: 1px solid var(--line);
  border-radius: 50%;
}

.inspection-orbit::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--sun);
  transform: translate(-50%, -50%);
}

.receipt-head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: start;
}
.receipt-head h3 { margin-bottom: 0.35rem; font-size: 1.7rem; }
.receipt-value { color: var(--indigo); font-size: 1.1rem; font-weight: 760; white-space: nowrap; }
.receipt-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 18px;
}
.receipt-grid div {
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.46);
}
.receipt-grid dt { color: var(--ink-soft); font-size: 0.68rem; }
.receipt-grid dd { margin: 0.18rem 0 0; overflow-wrap: anywhere; font-size: 0.78rem; }
.receipt-links { display: flex; flex-wrap: wrap; gap: 0.6rem; margin: 16px 0 0; }
.receipt-warning {
  margin: 16px 0 0;
  padding: 12px 14px;
  border-left: 3px solid var(--sun);
  color: var(--ink-soft);
  background: rgba(210, 157, 74, 0.07);
  font-size: 0.76rem;
}
.receipt-links a {
  padding: 0.48rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  text-decoration: none;
  font-size: 0.72rem;
  font-weight: 680;
}
.receipt-links a:hover,
.receipt-links a:focus-visible { background: white; }

.authority-card {
  position: sticky;
  top: 20px;
  padding: 28px;
  background: linear-gradient(160deg, rgba(71, 65, 102, 0.95), rgba(51, 46, 74, 0.98));
  color: rgba(255, 255, 255, 0.75);
}

.authority-card .eyebrow { color: #edc585; }
.authority-card h2 { margin-bottom: 0.8rem; color: white; font-size: 2.15rem; }
.authority-card > p { font-size: 0.86rem; }
.effect-list { margin: 1.5rem 0; padding: 0; list-style: none; }
.effect-list li { padding: 0.72rem 0; border-top: 1px solid rgba(255, 255, 255, 0.11); }
.effect-list span,
.effect-list strong { display: block; }
.effect-list span { font-size: 0.78rem; }
.effect-list strong { margin-top: 0.12rem; color: #f0c5bf; font-size: 0.69rem; letter-spacing: 0.04em; text-transform: uppercase; }
.quiet-rule { height: 1px; background: rgba(255, 255, 255, 0.13); }
.aside-note { margin: 1.2rem 0 0; font-size: 0.75rem !important; }

.failure-panel {
  padding: 1rem 1.2rem;
  border: 1px solid rgba(182, 102, 97, 0.28);
  border-radius: 16px;
  color: #7d3f3a;
  background: rgba(182, 102, 97, 0.08);
}
.failure-panel strong,
.failure-panel span { display: block; }

.lanes { padding: clamp(82px, 11vw, 140px) 0; }
.section-heading.wide { max-width: 820px; }
.lane-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); }
.lane-grid article { min-height: 220px; padding: 26px 22px 8px; border-right: 1px solid var(--line); }
.lane-grid article:last-child { border-right: 0; }
.lane-number { color: var(--rose); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.7rem; }
.lane-grid h3 { margin: 2.3rem 0 0.7rem; font-size: 1.6rem; }
.lane-grid p { color: var(--ink-soft); font-size: 0.83rem; }

.negative-space { display: grid; grid-template-columns: 0.78fr 1.22fr; gap: 46px; padding: clamp(28px, 5vw, 54px); }
.negative-intro p:last-child { max-width: 390px; color: var(--ink-soft); }
.unknown-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.unknown-grid article { padding: 20px; border: 1px solid var(--line); border-radius: 18px; background: rgba(255, 255, 255, 0.38); }
.unknown-grid h3 { margin-bottom: 0.55rem; font-size: 1.25rem; }
.unknown-grid p { margin-bottom: 0; color: var(--ink-soft); font-size: 0.78rem; }

.next-study { margin-top: 24px; padding: clamp(28px, 5vw, 54px); }
.next-study > h2 { max-width: 770px; }
.study-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 2.5rem; }
.study-steps article { padding: 24px; border: 1px solid var(--line); border-radius: 18px; background: rgba(255, 255, 255, 0.36); }
.study-steps span { color: var(--rose); font-size: 0.68rem; font-weight: 760; letter-spacing: 0.08em; text-transform: uppercase; }
.study-steps h3 { margin: 1.2rem 0 0.7rem; font-size: 1.38rem; }
.study-steps p { margin-bottom: 0; color: var(--ink-soft); font-size: 0.79rem; }

.artifact-note {
  display: grid;
  grid-template-columns: 1.12fr 0.88fr;
  gap: 44px;
  margin-top: 24px;
  padding: clamp(28px, 5vw, 54px);
  background:
    radial-gradient(circle at 88% 20%, rgba(210, 157, 74, 0.12), transparent 18rem),
    var(--card);
}

.artifact-note h2 { max-width: 660px; margin-bottom: 1rem; font-size: clamp(2rem, 4vw, 3.35rem); }
.artifact-note > div:first-child > p:last-of-type { max-width: 650px; color: var(--ink-soft); }
.artifact-note nav { display: flex; flex-wrap: wrap; gap: 0.65rem; margin-top: 1.4rem; }
.artifact-note nav a {
  padding: 0.52rem 0.76rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.42);
  text-decoration: none;
  font-size: 0.72rem;
  font-weight: 680;
}

.artifact-comparison {
  display: flex;
  min-height: 270px;
  padding: 28px;
  align-items: stretch;
  justify-content: center;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(71, 65, 102, 0.94);
  color: white;
}

.artifact-comparison p { margin: 0; }
.artifact-comparison p span,
.artifact-comparison p strong { display: block; }
.artifact-comparison p span { color: rgba(255, 255, 255, 0.62); font-size: 0.7rem; }
.artifact-comparison p strong { margin-top: 0.16rem; font-family: Iowan Old Style, Baskerville, serif; font-size: 1.45rem; font-weight: 520; }
.artifact-comparison .not-equal { margin: 0.85rem 0; color: #edc585; font-size: 1.4rem; }
.artifact-comparison small { margin-top: 1.5rem; padding-top: 1rem; border-top: 1px solid rgba(255, 255, 255, 0.12); color: rgba(255, 255, 255, 0.68); }

footer {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 60px 0 44px;
  color: var(--ink-soft);
  font-size: 0.76rem;
}
footer p { margin: 0; }
footer nav { display: flex; flex-wrap: wrap; gap: 1rem; }

@media (max-width: 900px) {
  .study-shell { grid-template-columns: 1fr; }
  .authority-card { position: static; }
  .lane-grid { grid-template-columns: repeat(2, 1fr); }
  .lane-grid article:nth-child(2) { border-right: 0; }
  .lane-grid article:nth-child(-n + 2) { border-bottom: 1px solid var(--line); }
  .negative-space { grid-template-columns: 1fr; }
  .artifact-note { grid-template-columns: 1fr; }
  .study-steps { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .site-header, main, footer { width: min(100% - 24px, 1180px); }
  .site-header { align-items: flex-start; gap: 1rem; }
  .status-pill { max-width: 160px; border-radius: 18px; }
  .hero { padding-top: 65px; }
  h1 { font-size: clamp(2.7rem, 15vw, 4.4rem); }
  .hero-boundary { gap: 0.42rem; padding-inline: 0.7rem; font-size: 0.69rem; }
  .snapshot-note { align-items: center; flex-direction: column; gap: 0.2rem; }
  .section-heading, .chart-intro, footer { align-items: flex-start; flex-direction: column; }
  .observation-row { grid-template-columns: repeat(2, 1fr); }
  .receipt-head { flex-direction: column; }
  .receipt-grid, .unknown-grid { grid-template-columns: 1fr; }
  .lane-grid { grid-template-columns: 1fr; }
  .lane-grid article { min-height: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  .lane-grid article:last-child { border-bottom: 0; }
  .lane-grid h3 { margin-top: 1.2rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.001ms !important; }
}