:root {
  --rca-ink: #16212b;
  --rca-muted: #5b6874;
  --rca-bg: #f4f6f7;
  --rca-surface: #ffffff;
  --rca-line: #d5dce2;
  --rca-teal: #087b72;
  --rca-teal-soft: #e3f3f0;
  --rca-blue: #245ea8;
  --rca-blue-soft: #edf4ff;
  --rca-coral: #bd4938;
  --rca-coral-soft: #fff0ed;
  --rca-gold: #9c6b0c;
  --rca-gold-soft: #fff7df;
}

* {
  box-sizing: border-box;
  letter-spacing: 0;
}

body.rca-page {
  margin: 0;
  background: var(--rca-bg);
  color: var(--rca-ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.7;
}

.rca-main {
  width: min(920px, calc(100% - 40px));
  margin: 0 auto;
  padding: 56px 0 90px;
}

.rca-main section {
  margin-top: 54px;
}

.rca-hero h1 {
  max-width: 850px;
  margin: 0;
  font-size: 3.15rem;
  line-height: 1.08;
}

.rca-eyebrow {
  margin: 0 0 9px;
  color: var(--rca-teal);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.rca-deck {
  max-width: 810px;
  margin: 20px 0 0;
  color: var(--rca-muted);
  font-size: 1.18rem;
}

.rca-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: 20px;
  color: var(--rca-muted);
  font-size: 0.82rem;
}

.rca-meta span + span::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 4px;
  margin: 0 12px 2px 0;
  border-radius: 50%;
  background: var(--rca-teal);
}

.rca-hero figure {
  aspect-ratio: 16 / 7;
  margin: 30px 0 0;
  overflow: hidden;
  border-radius: 8px;
  background: #dce3e7;
}

.rca-hero img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.rca-main h2 {
  margin: 0;
  font-size: 1.75rem;
  line-height: 1.25;
}

.rca-main h3 {
  font-size: 1.08rem;
}

.rca-main p {
  color: var(--rca-muted);
}

.rca-main a {
  color: var(--rca-blue);
  text-underline-offset: 3px;
}

.rca-answer {
  padding: 28px;
  border-left: 4px solid var(--rca-teal);
  background: var(--rca-surface);
}

.rca-answer p:last-child {
  margin-bottom: 0;
}

.rca-tool-callout,
.rca-final-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-top: 26px;
  padding: 22px 24px;
  border: 1px solid #a8c2d8;
  border-radius: 8px;
  background: var(--rca-blue-soft);
}

.rca-tool-callout strong,
.rca-tool-callout span {
  display: block;
}

.rca-tool-callout span {
  margin-top: 4px;
  color: var(--rca-muted);
  font-size: 0.88rem;
}

.rca-tool-callout a,
.rca-final-cta > a {
  display: inline-flex;
  min-height: 46px;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  border-radius: 6px;
  background: var(--rca-ink);
  color: #fff;
  font-weight: 780;
  text-decoration: none;
}

.rca-operation-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 20px;
}

.rca-operation-grid article {
  min-width: 0;
  padding: 20px;
  border-top: 3px solid var(--rca-teal);
  background: var(--rca-surface);
}

.rca-operation-grid article:nth-child(2) {
  border-color: var(--rca-blue);
}

.rca-operation-grid article:nth-child(3) {
  border-color: var(--rca-coral);
}

.rca-operation-grid span {
  color: var(--rca-muted);
  font-size: 0.74rem;
  font-weight: 800;
}

.rca-operation-grid h3 {
  margin: 8px 0 4px;
}

.rca-operation-grid p {
  margin: 0;
  font-size: 0.9rem;
}

.rca-formula {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: stretch;
  gap: 14px;
  margin: 24px 0 30px;
}

.rca-formula > div {
  padding: 20px;
  border: 1px solid var(--rca-line);
  border-radius: 6px;
  background: var(--rca-surface);
}

.rca-formula span {
  color: var(--rca-muted);
  font-size: 0.78rem;
  font-weight: 720;
}

.rca-formula strong {
  display: block;
  margin-top: 5px;
}

.rca-formula .rca-versus {
  align-self: center;
  color: var(--rca-teal);
  font-weight: 800;
}

.rca-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--rca-line);
  border-radius: 8px;
  background: var(--rca-surface);
}

.rca-table-wrap table {
  width: 100%;
  min-width: 690px;
  border-collapse: collapse;
}

.rca-table-wrap th,
.rca-table-wrap td {
  padding: 13px 15px;
  border-bottom: 1px solid var(--rca-line);
  text-align: left;
  vertical-align: top;
}

.rca-table-wrap th {
  background: #eef1f3;
  color: #384653;
  font-size: 0.78rem;
}

.rca-table-wrap td {
  color: var(--rca-muted);
  font-size: 0.86rem;
}

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

.rca-example {
  padding: 28px;
  border: 1px solid #e1c783;
  border-radius: 8px;
  background: var(--rca-gold-soft);
}

.rca-example-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 22px;
}

.rca-example dl {
  margin: 0;
  padding: 17px;
  background: #fff;
}

.rca-example dl > div + div {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--rca-line);
}

.rca-example dt {
  color: var(--rca-muted);
  font-size: 0.75rem;
}

.rca-example dd {
  margin: 3px 0 0;
  font-size: 1.05rem;
  font-weight: 800;
}

.rca-example-result {
  margin-bottom: 0;
  color: var(--rca-ink) !important;
  font-weight: 650;
}

.rca-note {
  margin-bottom: 0;
  font-size: 0.76rem;
}

.rca-checklist {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: rca-step;
}

.rca-checklist li {
  display: grid;
  grid-template-columns: minmax(180px, 0.65fr) minmax(0, 1.35fr);
  gap: 22px;
  padding: 18px 0;
  border-bottom: 1px solid var(--rca-line);
  counter-increment: rca-step;
}

.rca-checklist strong::before {
  content: counter(rca-step, decimal-leading-zero) " ";
  margin-right: 8px;
  color: var(--rca-teal);
}

.rca-checklist span {
  color: var(--rca-muted);
}

.rca-warning {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 18px;
  padding: 25px;
  border: 1px solid #e1a89f;
  border-radius: 8px;
  background: var(--rca-coral-soft);
}

.rca-warning > div:first-child {
  display: grid;
  width: 52px;
  height: 52px;
  place-items: center;
  border-radius: 8px;
  background: var(--rca-coral);
  color: #fff;
  font-size: 1.35rem;
  font-weight: 850;
}

.rca-warning p {
  margin-bottom: 0;
}

.rca-documents {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.rca-documents li {
  padding: 13px 15px 13px 39px;
  border: 1px solid var(--rca-line);
  background: var(--rca-surface);
  color: #41505c;
  font-size: 0.88rem;
  position: relative;
}

.rca-documents li::before {
  content: "✓";
  position: absolute;
  left: 15px;
  color: var(--rca-teal);
  font-weight: 850;
}

.rca-faq {
  margin-top: 20px;
  border-top: 1px solid var(--rca-line);
}

.rca-faq details {
  border-bottom: 1px solid var(--rca-line);
}

.rca-faq summary {
  padding: 18px 0;
  cursor: pointer;
  font-weight: 750;
}

.rca-faq p {
  max-width: 780px;
  margin: -4px 0 18px;
}

.rca-sources {
  padding-top: 28px;
  border-top: 1px solid var(--rca-line);
}

.rca-sources ul {
  margin: 16px 0 0;
  padding-left: 20px;
}

.rca-sources li + li {
  margin-top: 8px;
}

.rca-author {
  display: grid;
  grid-template-columns: 130px minmax(0, 1fr);
  align-items: center;
  gap: 24px;
  margin-top: 54px;
  padding-top: 32px;
  border-top: 1px solid var(--rca-line);
}

.rca-author img {
  width: 130px;
  height: 130px;
  border-radius: 8px;
  object-fit: cover;
  object-position: center top;
}

.rca-author h2,
.rca-author p {
  margin: 0;
}

.rca-author p:not(.rca-eyebrow) {
  margin: 7px 0;
}

.rca-final-cta {
  margin-top: 40px;
  border-color: #9fbeb9;
  background: var(--rca-teal-soft);
}

.rca-final-cta h2,
.rca-final-cta p {
  margin: 0;
}

.rca-final-cta p {
  max-width: 610px;
  margin-top: 5px;
}

@media (max-width: 760px) {
  .rca-main {
    width: min(100% - 28px, 680px);
    padding-top: 36px;
  }

  .rca-hero h1 {
    font-size: 2.35rem;
  }

  .rca-operation-grid,
  .rca-formula,
  .rca-example-grid {
    grid-template-columns: 1fr;
  }

  .rca-formula .rca-versus {
    justify-self: start;
  }

  .rca-tool-callout,
  .rca-final-cta {
    align-items: flex-start;
    flex-direction: column;
  }

  .rca-checklist li {
    grid-template-columns: 1fr;
    gap: 5px;
  }
}

@media (max-width: 520px) {
  .rca-main {
    width: min(100% - 20px, 500px);
    padding-bottom: 60px;
  }

  .rca-main section {
    margin-top: 42px;
  }

  .rca-hero h1 {
    font-size: 2rem;
  }

  .rca-deck {
    font-size: 1rem;
  }

  .rca-meta {
    display: grid;
    gap: 4px;
  }

  .rca-meta span + span::before {
    display: none;
  }

  .rca-answer,
  .rca-example,
  .rca-warning {
    padding: 20px;
  }

  .rca-warning {
    grid-template-columns: 1fr;
  }

  .rca-documents {
    grid-template-columns: 1fr;
  }

  .rca-author {
    grid-template-columns: 86px minmax(0, 1fr);
    align-items: start;
    gap: 14px;
  }

  .rca-author img {
    width: 86px;
    height: 86px;
  }
}