:root {
  --page: #f4f6f7;
  --surface: #ffffff;
  --surface-soft: #eef2f3;
  --ink: #111315;
  --ink-2: #343a40;
  --muted: #667078;
  --line: #ccd3d8;
  --line-strong: #1c2226;
  --rx: #c83712;
  --green: #1f5b4b;
  --green-soft: #e8f3ef;
  --red-soft: #fff0eb;
  --max: 1040px;
  --sans: "Helvetica Neue", Helvetica, Arial, system-ui, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--page);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.5;
}

body {
  margin: 0;
}

a {
  color: var(--green);
}

.wrap {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
}

.top {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
}

.top .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 62px;
}

.brand {
  color: var(--ink);
  font-size: 27px;
  font-weight: 800;
  line-height: 1;
  text-decoration: none;
}

.brand em {
  color: var(--rx);
  font-style: normal;
}

.nav {
  display: flex;
  align-items: center;
  gap: 18px;
}

.nav a {
  color: var(--ink-2);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

.nav a:hover {
  color: var(--rx);
}

.nav .tool {
  border: 1px solid var(--line-strong);
  background: var(--ink);
  color: #fff;
  padding: 8px 12px;
}

.page {
  padding-top: 34px;
  padding-bottom: 64px;
}

.article {
  min-width: 0;
}

.crumb {
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 13px;
}

.crumb a {
  color: var(--muted);
}

.kicker {
  margin-bottom: 10px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
}

.kicker a {
  color: inherit;
}

.article h1 {
  max-width: 900px;
  margin: 0 0 18px;
  font-size: 42px;
  font-weight: 750;
  line-height: 1.08;
}

.article h1 em {
  color: var(--rx);
  font-style: normal;
}

.lede {
  max-width: 800px;
  margin: 0 0 20px;
  color: var(--ink-2);
  font-size: 18px;
}

.article p {
  color: var(--ink-2);
  font-size: 16px;
}

.article h2 {
  margin: 34px 0 10px;
  font-size: 26px;
  line-height: 1.2;
}

.article h3 {
  margin: 0 0 7px;
  font-size: 16px;
  line-height: 1.25;
}

.article ul,
.article ol {
  padding-left: 22px;
  font-size: 16px;
}

.article li {
  margin: 7px 0;
}

.answer {
  margin: 0 0 18px;
  border-top: 4px solid var(--green);
  background: var(--surface);
  padding: 18px 20px 20px;
  box-shadow: 0 1px 0 rgba(17, 19, 21, 0.06);
}

.answer h2 {
  margin: 0 0 7px;
  color: var(--green);
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
}

.answer p {
  max-width: 920px;
  margin: 0;
  color: var(--ink);
  font-size: 16px;
  line-height: 1.45;
}

.answer .answer-short {
  max-width: none;
  font-size: 48px;
  font-weight: 800;
  line-height: 1.05;
}

.answer .answer-detail {
  max-width: 880px;
  margin-top: 14px;
  color: var(--ink-2);
  font-size: 16px;
}

.answer-tool {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  margin-top: 18px;
  border: 1px solid var(--line-strong);
  background: var(--ink);
  color: #fff;
  padding: 10px 16px;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
}

.answer-tool:hover,
.answer-tool:focus-visible {
  background: var(--green);
}

.quick-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 0 0 24px;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--surface);
  list-style: none;
}

.quick-grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.quick-grid li {
  min-width: 0;
  margin: 0;
  padding: 14px 16px;
  border-right: 1px solid var(--line);
}

.quick-grid li:last-child {
  border-right: 0;
}

.quick-grid strong,
.quick-grid span {
  display: block;
}

.quick-grid strong {
  margin-bottom: 3px;
  color: var(--ink);
  font-size: 16px;
}

.quick-grid span {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.35;
}

.quick-grid .code {
  display: inline-block;
  margin-right: 5px;
}

.carrier-chart-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  align-items: start;
}

.carrier-chart {
  min-width: 0;
  border: 1px solid var(--line);
  background: var(--surface);
}

.carrier-chart h2 {
  margin: 0;
  border-bottom: 3px solid var(--green);
  padding: 15px 16px;
  font-size: 20px;
}

.carrier-chart .table-wrap {
  margin: 0;
  border: 0;
  overflow: visible;
}

.carrier-chart .guide-table {
  min-width: 0;
}

.carrier-chart .guide-table th:nth-child(3),
.carrier-chart .guide-table td:nth-child(3) {
  display: none;
}

.carrier-chart .guide-table th:first-child,
.carrier-chart .guide-table td:first-child {
  width: 92px;
}

.carrier-chart-tool {
  margin-bottom: 12px;
}

.guide-chart {
  margin-bottom: 18px;
  border: 1px solid var(--line);
  background: var(--surface);
}

.guide-chart h2 {
  margin: 0;
  border-bottom: 3px solid var(--green);
  padding: 15px 16px;
  font-size: 21px;
}

.guide-chart .table-wrap {
  margin: 0;
  border: 0;
}

.guide-chart.two-column-chart .guide-table th:nth-child(3),
.guide-chart.two-column-chart .guide-table td:nth-child(3) {
  display: none;
}

.guide-chart.two-column-chart .guide-table {
  min-width: 0;
}

.guide-chart.two-column-chart .guide-table th:first-child,
.guide-chart.two-column-chart .guide-table td:first-child {
  width: 190px;
}

.guide-chart.code-chart .guide-table th:first-child,
.guide-chart.code-chart .guide-table td:first-child {
  width: 72px;
}

.chart-heading {
  margin: 0 0 4px !important;
  font-size: 22px !important;
}

.chart-caption {
  margin: 0 0 14px;
  color: var(--muted) !important;
  font-size: 15px !important;
}

.note,
.warning,
.example {
  margin: 20px 0;
  border-left: 4px solid var(--green);
  background: var(--green-soft);
  padding: 15px 18px;
}

.warning {
  border-left-color: var(--rx);
  background: var(--red-soft);
}

.example {
  border-left-color: var(--line-strong);
  background: var(--surface-soft);
}

.note p:first-of-type,
.warning p:first-of-type,
.example p:first-of-type {
  margin-top: 0;
}

.note p:last-child,
.warning p:last-child,
.example p:last-child {
  margin-bottom: 0;
}

.detail-block {
  margin: 12px 0;
  border: 1px solid var(--line);
  background: var(--surface);
}

.detail-block > summary,
.sources-box > summary {
  position: relative;
  padding: 16px 50px 16px 18px;
  color: var(--ink);
  font-size: 17px;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}

.detail-block > summary::-webkit-details-marker,
.sources-box > summary::-webkit-details-marker {
  display: none;
}

.detail-block > summary::after,
.sources-box > summary::after {
  content: "+";
  position: absolute;
  top: 50%;
  right: 18px;
  color: var(--green);
  font-size: 24px;
  font-weight: 400;
  line-height: 1;
  transform: translateY(-50%);
}

.detail-block[open] > summary::after,
.sources-box[open] > summary::after {
  content: "−";
}

.detail-content {
  border-top: 1px solid var(--line);
  padding: 4px 18px 20px;
}

.detail-content > h2:first-child {
  margin-top: 20px;
}

.table-wrap {
  width: 100%;
  margin: 16px 0 22px;
  overflow-x: auto;
  border: 1px solid var(--line);
}

.guide-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
}

.guide-table th,
.guide-table td {
  padding: 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.guide-table th {
  background: var(--surface-soft);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
}

.guide-table td {
  color: var(--ink-2);
  font-size: 14px;
}

.guide-table tr:last-child td {
  border-bottom: 0;
}

.code {
  display: inline-block;
  min-width: 34px;
  border: 1px solid var(--line-strong);
  padding: 2px 6px;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  text-align: center;
}

.steps {
  counter-reset: step;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 18px 0 24px;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--surface);
  list-style: none;
}

.steps li {
  counter-increment: step;
  position: relative;
  margin: 0;
  padding: 45px 14px 16px;
  border-right: 1px solid var(--line);
  font-size: 14px;
}

.steps li:last-child {
  border-right: 0;
}

.steps li::before {
  content: counter(step);
  position: absolute;
  top: 13px;
  left: 14px;
  display: grid;
  width: 24px;
  height: 24px;
  place-items: center;
  background: var(--ink);
  color: #fff;
  font: 700 11px/1 var(--mono);
}

.quarter-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 0 0 22px;
  border: 1px solid var(--line-strong);
  background: var(--surface);
}

.quarter {
  min-height: 105px;
  padding: 14px;
  border-right: 1px solid var(--line);
}

.quarter:last-child {
  border-right: 0;
}

.quarter strong,
.quarter span {
  display: block;
}

.quarter strong {
  margin-bottom: 4px;
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
}

.quarter span {
  color: var(--muted);
  font-size: 13px;
}

.quarter.open {
  background: var(--green-soft);
  box-shadow: inset 0 4px 0 var(--green);
}

.quarter.closed {
  background: var(--red-soft);
  box-shadow: inset 0 4px 0 var(--rx);
}

.quarter .status {
  margin-top: 8px;
  color: var(--ink);
  font-weight: 700;
}

.related {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 18px 0;
}

.related a {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  padding: 14px;
  text-decoration: none;
}

.related a:hover {
  border-color: var(--green);
}

.related strong,
.related span {
  display: block;
}

.related span {
  margin-top: 3px;
  color: var(--muted);
  font-size: 13px;
}

.sources-box {
  margin-top: 28px;
  border: 1px solid var(--line);
  background: var(--surface);
}

.sources-box > summary {
  font-size: 15px;
}

.source-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 24px;
  border-top: 1px solid var(--line);
  padding: 18px;
}

.sources-box a {
  display: block;
  font-weight: 700;
  text-decoration: none;
}

.sources-box p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.sources-box .source-date {
  color: var(--green);
  font-family: var(--mono);
  font-size: 10px;
  text-transform: uppercase;
}

.footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
  padding: 28px 0 38px;
  color: var(--muted);
  font-size: 13px;
}

.footer .wrap {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.footer a {
  color: var(--ink);
}

.frx-cookie-banner {
  position: fixed;
  right: 18px;
  bottom: 18px;
  left: 18px;
  z-index: 2147483000;
  max-width: 980px;
  margin: 0 auto;
  border: 2px solid var(--line-strong);
  background: var(--surface);
  box-shadow: 6px 6px 0 rgba(17, 19, 21, 0.2);
  color: var(--ink);
  padding: 18px 20px;
}

.frx-cookie-banner[hidden] {
  display: none !important;
}

.frx-cookie-title {
  margin-bottom: 6px;
  color: var(--rx);
  font: 700 11px/1.2 var(--mono);
  text-transform: uppercase;
}

.frx-cookie-copy {
  margin: 0;
  color: var(--ink-2);
  font-size: 13.5px;
}

.frx-cookie-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.frx-cookie-actions button,
.frx-cookie-actions a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--ink);
  padding: 9px 12px;
  font: 700 10px/1.2 var(--mono);
  text-decoration: none;
  text-transform: uppercase;
  cursor: pointer;
}

.frx-cookie-actions .primary {
  background: var(--ink);
  color: #fff;
}

@media (max-width: 760px) {
  .wrap {
    width: min(var(--max), calc(100% - 28px));
  }

  .top .wrap {
    min-height: 56px;
  }

  .nav a:not(.tool) {
    display: none;
  }

  .page {
    padding-top: 24px;
  }

  .article h1 {
    font-size: 33px;
  }

  .answer .answer-short {
    font-size: 36px;
  }

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

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

  .quick-grid li:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

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

  .steps li:nth-child(2n) {
    border-right: 0;
  }

  .steps li:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

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

  .quarter:nth-child(2n) {
    border-right: 0;
  }

  .quarter:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

  .related,
  .source-list,
  .carrier-chart-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 460px) {
  .article h1 {
    font-size: 30px;
  }

  .quick-grid,
  .quick-grid.three,
  .steps {
    grid-template-columns: 1fr;
  }

  .quick-grid li,
  .quick-grid li:nth-child(2n),
  .steps li,
  .steps li:nth-child(2n) {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .quick-grid li:last-child,
  .steps li:last-child {
    border-bottom: 0;
  }

  .frx-cookie-banner {
    right: 10px;
    bottom: 10px;
    left: 10px;
    padding: 15px;
    box-shadow: 4px 4px 0 rgba(17, 19, 21, 0.2);
  }

  .frx-cookie-actions {
    flex-direction: column;
  }

  .frx-cookie-actions button,
  .frx-cookie-actions a {
    width: 100%;
  }
}