* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  scroll-behavior: smooth;
  background: var(--color-newspaper-white);
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--fg);
  background: var(--bg);
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.index-app {
  width: min(1480px, 100%);
  margin: 0 auto;
  padding: 0 18px 32px;
  background: var(--color-newspaper-white);
}

.site-masthead {
  padding: 22px 12px 0;
}

.site-masthead h1 {
  margin: 0;
  font-family: var(--font-masthead);
  font-size: clamp(48px, 8.4vw, 116px);
  font-weight: 400;
  line-height: 0.95;
  letter-spacing: 0;
  text-align: center;
  text-shadow: 3px 3px 5px rgba(0, 0, 0, 0.12);
  white-space: nowrap;
  overflow: hidden;
  padding-bottom: 14px;
  border-bottom: var(--border-4);
}

.masthead-rail {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 20px;
  padding-top: 11px;
  font-family: var(--font-headline);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.2em;
  line-height: 1.2;
  text-transform: uppercase;
}

.masthead-rail strong {
  color: var(--fg-accent);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-align: center;
  white-space: nowrap;
}

.masthead-rail span:last-child {
  text-align: right;
}

.masthead-rail a {
  color: inherit;
  text-decoration: none;
}

.masthead-rail a:hover,
.masthead-rail a:focus-visible {
  color: var(--fg-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.red-rule {
  height: 3px;
  margin-top: 12px;
  background: var(--fg-accent);
}

.hero {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-template-areas:
    "headline photo"
    "explainer explainer";
  gap: 20px 36px;
  align-items: start;
  padding: 30px 6px 22px;
  border-bottom: var(--border-1);
}

.feature-headline {
  grid-area: headline;
}

.hero h1,
.panel h2 {
  margin: 6px 0 8px;
  color: var(--fg);
  font-family: var(--font-headline);
  font-size: 46px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0;
  text-transform: uppercase;
}

.panel h2 {
  font-size: 30px;
}

.deck {
  max-width: 680px;
  margin: 0 0 12px;
  color: var(--color-accent-gray-700);
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.55;
}

.byline {
  color: var(--fg-muted);
  font-family: var(--font-headline);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.byline em {
  color: var(--fg-muted);
  font-family: var(--font-serif);
  font-style: italic;
  letter-spacing: 0;
  text-transform: none;
}

.title-explainer {
  display: grid;
  grid-area: explainer;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 36px;
  margin-top: 0;
  padding-top: 20px;
  border-top: var(--border-thin);
}

.title-explainer h2 {
  grid-column: 1 / -1;
  margin: 0 0 10px;
  color: var(--fg);
  font-family: var(--font-serif);
  font-size: clamp(28px, 3.2vw, 44px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: 0;
}

.feature-copy-columns {
  display: grid;
  grid-column: 1 / -1;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 36px;
}

.title-explainer p {
  margin: 0 0 12px;
  color: var(--color-accent-gray-700);
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.72;
}

.title-explainer p:first-of-type::first-letter {
  float: left;
  padding: 5px 8px 0 0;
  color: var(--fg-accent);
  font-family: var(--font-serif);
  font-size: 54px;
  font-weight: 700;
  line-height: 0.9;
}

.hero-side {
  grid-area: photo;
  display: grid;
  align-content: start;
}

.price-card {
  display: grid;
  gap: 4px;
  justify-items: center;
  padding: 18px 20px;
  border: var(--border-1);
  text-align: center;
}

.index-photo {
  position: relative;
  width: min(380px, 100%);
  min-height: 196px;
  margin: 0;
  align-content: center;
  justify-self: center;
  border: var(--border-4);
  background: var(--color-accent-gray-100);
  box-shadow: inset 0 0 0 9px var(--color-newspaper-white);
}

.index-photo::after {
  position: absolute;
  right: 12px;
  bottom: 10px;
  left: 12px;
  height: 1px;
  background: var(--fg);
  content: "";
  opacity: 0.35;
}

.lab,
.price-card .lab,
.metric-strip .lab {
  color: var(--fg-muted);
  font-family: var(--font-headline);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.price-card .nav {
  color: var(--fg);
  font-family: var(--font-headline);
  font-size: 42px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0;
}

.delta {
  color: var(--color-yes-text);
  font-family: var(--font-mono);
  font-size: 14px;
}

.delta.dn,
.red-text {
  color: var(--fg-accent);
}

.price-note {
  color: var(--fg-muted);
  font-family: var(--font-headline);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.metric-strip {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  border-bottom: var(--border-1);
}

.metric-strip.open-interest-hidden {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.metric-strip article {
  min-width: 0;
  padding: 14px 16px;
  border-right: var(--border-thin);
}

.metric-strip article[hidden] {
  display: none;
}

.metric-strip article:last-child {
  border-right: 0;
}

.metric-strip strong {
  display: block;
  margin-top: 5px;
  color: var(--fg);
  font-family: var(--font-headline);
  font-size: 24px;
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: 0;
}

.metric-strip small {
  display: block;
  margin-top: 3px;
  color: var(--fg-muted);
  font-family: var(--font-headline);
  font-size: 10px;
  letter-spacing: 0.08em;
  line-height: 1.3;
  text-transform: uppercase;
}

.detail-grid,
.methodology-tape-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(340px, 0.9fr);
  gap: 28px;
  padding: 24px;
}

.methodology-tape-grid {
  grid-template-columns: minmax(0, 1.55fr) minmax(320px, 0.75fr);
  align-items: start;
  padding-top: 0;
}

.basket-row {
  padding: 0 24px 24px;
}

.detail-grid,
.basket-row {
  align-items: start;
}

.panel {
  min-width: 0;
  padding: 18px 20px 20px;
  border: var(--border-1);
  background: var(--color-newspaper-white);
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 18px;
}

.eyebrow,
.kicker {
  color: var(--fg-accent);
  font-family: var(--font-headline);
  font-size: 11px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.range {
  display: inline-flex;
  flex: 0 0 auto;
  gap: 0;
  padding-top: 4px;
}

.range button,
.btn-thin {
  min-height: 44px;
  padding: 8px 14px;
  border: var(--border-1);
  background: var(--color-newspaper-white);
  color: var(--fg);
  font-family: var(--font-headline);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-decoration: none;
  text-transform: uppercase;
}

.range button + button {
  border-left: 0;
}

.basket-tabs button {
  min-width: 142px;
}

.range button.active,
.range button:hover,
.range button:focus-visible,
.btn-thin.solid {
  background: var(--fg);
  color: var(--color-newspaper-white);
}

.btn-thin:hover,
.btn-thin:focus-visible {
  background: var(--fg);
  color: var(--color-newspaper-white);
}

.btn-thin:active,
.range button:active {
  box-shadow: inset 1px 1px 3px rgba(0, 0, 0, 0.25);
}

.chart-frame {
  margin-top: 12px;
  border: var(--border-thin);
}

.chart {
  min-height: 318px;
  background: var(--color-newspaper-white);
}

.chart svg {
  display: block;
  width: 100%;
  height: 318px;
}

.chart-empty {
  display: grid;
  min-height: 318px;
  place-items: center;
  padding: 20px;
  color: var(--fg-muted);
  font-family: var(--font-headline);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-align: center;
  text-transform: uppercase;
}

.chart-meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: var(--border-thin);
  color: var(--fg-muted);
  font-family: var(--font-headline);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.chart-meta b {
  color: var(--fg);
  font-family: var(--font-mono);
  letter-spacing: 0;
}

.gauge-readout {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  margin-top: 16px;
}

.gauge-readout strong {
  color: var(--fg);
  font-family: var(--font-headline);
  font-size: 54px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0;
}

.gauge-readout span {
  color: var(--fg-muted);
  font-family: var(--font-mono);
  font-size: 13px;
  text-align: right;
}

.gauge-track {
  height: 24px;
  margin: 14px 0;
  border: var(--border-1);
  background: var(--color-accent-gray-100);
}

.gauge-track span {
  display: block;
  width: 0%;
  height: 100%;
  background: var(--fg);
  transition: width var(--motion-normal);
}

.gauge-scale {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: -6px;
  color: var(--fg-muted);
  font-family: var(--font-headline);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.12em;
  line-height: 1.3;
  text-transform: uppercase;
}

.gauge-scale span {
  min-width: 0;
}

.gauge-scale span:last-child {
  text-align: right;
}

.equation-card {
  display: grid;
  gap: 6px;
  margin: 16px 0 0;
  padding: 12px 14px;
  border: var(--border-1);
  background: var(--color-accent-gray-100);
}

.equation-card span,
.equation-card small {
  color: var(--fg-muted);
  font-family: var(--font-headline);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.12em;
  line-height: 1.35;
  text-transform: uppercase;
}

.equation-card strong {
  color: var(--fg);
  font-family: var(--font-serif);
  font-size: 25px;
  line-height: 1.1;
}

.equation-card var {
  font-style: italic;
}

.equation-legend {
  display: grid;
  gap: 4px;
}

.serif-note,
.method-grid p {
  color: var(--color-accent-gray-700);
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.65;
}

.quality-list {
  display: grid;
  gap: 0;
  margin: 18px 0 0;
  border-top: var(--border-1);
}

.quality-list div {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 12px;
  padding: 11px 0;
  border-bottom: var(--border-thin);
}

.quality-list dt,
.quality-list dd,
.changes-list time {
  margin: 0;
  font-family: var(--font-headline);
  font-size: 10px;
  letter-spacing: 0.12em;
  line-height: 1.35;
  text-transform: uppercase;
}

.quality-list dt {
  color: var(--fg);
  font-weight: 900;
}

.quality-list dd {
  color: var(--fg-muted);
}

.table-wrap {
  max-width: 100%;
  margin-top: 14px;
  overflow-x: auto;
}

.basket-panel .table-wrap {
  max-height: 552px;
  overflow: auto;
  border-bottom: var(--border-thin);
}

table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
}

th,
td {
  padding: 12px 8px;
  border-bottom: var(--border-thin);
  text-align: left;
  vertical-align: middle;
}

th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--color-newspaper-white);
  color: var(--fg-muted);
  font-family: var(--font-headline);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

td {
  color: var(--fg);
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.35;
}

.market-text {
  display: -webkit-box;
  max-width: min(840px, 100%);
  min-height: 37px;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

td:nth-child(n + 2),
th:nth-child(n + 2) {
  text-align: right;
  white-space: nowrap;
}

.leg {
  display: inline-flex;
  justify-content: center;
  min-width: 54px;
  padding: 5px 10px;
  border: var(--border-1);
  font-family: var(--font-headline);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.leg.yes {
  border-color: var(--color-yes-text);
  background: #eff5ef;
  color: var(--color-yes-text);
}

.leg.no {
  border-color: var(--color-no-text);
  background: #f8efef;
  color: var(--color-no-text);
}

.mono {
  font-family: var(--font-mono);
  letter-spacing: 0;
}

.changes-list {
  display: grid;
  gap: 0;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.changes-panel .changes-list {
  min-height: 0;
  overflow: auto;
  padding-right: 6px;
}

.changes-panel {
  display: flex;
  min-height: 0;
  overflow: hidden;
  flex-direction: column;
}

.changes-list li {
  padding: 13px 0;
  border-bottom: var(--border-thin);
}

.changes-list li:last-child {
  border-bottom: 0;
}

.changes-list time {
  display: block;
  color: var(--fg-accent);
  font-weight: 900;
}

.changes-list strong {
  display: block;
  margin-top: 5px;
  color: var(--fg);
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.25;
}

.changes-list span {
  display: block;
  margin-top: 5px;
  color: var(--fg-muted);
  font-family: var(--font-headline);
  font-size: 11px;
  letter-spacing: 0.06em;
  line-height: 1.4;
  text-transform: uppercase;
}

.methodology-panel {
  margin: 0;
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 16px;
  border-top: var(--border-1);
}

.method-grid article {
  min-width: 0;
  padding: 15px 16px 0 0;
  border-right: var(--border-thin);
}

.method-grid article + article {
  padding-left: 16px;
}

.method-grid article:nth-child(odd) {
  padding-left: 0;
}

.method-grid article:nth-child(even) {
  border-right: 0;
}

.method-grid article:last-child {
  border-right: 0;
}

.method-grid h3 {
  margin: 0 0 8px;
  color: var(--fg);
  font-family: var(--font-headline);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.method-equation-card {
  gap: 5px;
  margin: 0 0 10px;
  padding: 10px 12px;
}

.method-equation-card strong {
  font-size: 20px;
}

.method-equation-card .equation-legend {
  gap: 3px;
}

.loading-text {
  color: var(--fg-muted);
}

@media (max-width: 1120px) {
  .hero,
  .detail-grid,
  .methodology-tape-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    grid-template-areas:
      "headline"
      "photo"
      "explainer";
  }

  .title-explainer,
  .feature-copy-columns {
    grid-template-columns: 1fr;
  }

  .index-photo {
    min-height: 220px;
  }

  .changes-panel {
    max-height: none !important;
  }

  .changes-panel .changes-list {
    max-height: 420px !important;
  }

  .method-grid article:nth-child(2n) {
    border-right: 0;
  }
}

@media (max-width: 760px) {
  .index-app {
    padding-inline: 12px;
  }

  .section-head,
  .chart-meta {
    align-items: stretch;
    flex-direction: column;
  }

  .site-masthead h1 {
    font-size: clamp(44px, 14vw, 66px);
    white-space: normal;
  }

  .masthead-rail {
    grid-template-columns: 1fr;
    gap: 8px;
    text-align: center;
  }

  .masthead-rail span:last-child {
    text-align: center;
  }

  .hero,
  .detail-grid,
  .methodology-tape-grid,
  .basket-row,
  .methodology-panel {
    padding-inline: 14px;
  }

  .hero h1 {
    font-size: 38px;
  }

  .panel h2 {
    font-size: 26px;
  }

  .metric-strip,
  .metric-strip.open-interest-hidden,
  .method-grid {
    grid-template-columns: 1fr;
  }

  .metric-strip article,
  .method-grid article,
  .method-grid article + article,
  .method-grid article:nth-child(2n) {
    padding-left: 14px;
    padding-right: 14px;
    border-right: 0;
    border-bottom: var(--border-thin);
  }

  .metric-strip article:last-child,
  .method-grid article:last-child {
    border-bottom: 0;
  }

  .price-card .nav,
  .gauge-readout strong {
    font-size: 40px;
  }

  .gauge-readout {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  .gauge-readout span {
    text-align: left;
  }

  .range {
    overflow-x: auto;
  }

  .quality-list div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .basket-panel .table-wrap {
    max-height: 520px;
  }
}

@media (max-width: 520px) {
  .panel {
    padding: 14px;
  }

  .gauge-scale {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3px;
    letter-spacing: 0.08em;
  }

  .gauge-scale span:last-child {
    text-align: left;
  }

  .gauge-panel .serif-note {
    max-width: 31ch;
  }

  .equation-card strong {
    font-size: 20px;
  }

  .method-equation-card strong {
    font-size: 18px;
  }

  .chart,
  .chart-empty {
    min-height: 260px;
  }

  .chart svg {
    height: 260px;
  }

  .hero h1 {
    font-size: 34px;
  }
}

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

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