:root {
  --article-text: #3e5650;
  --article-panel: rgba(246, 253, 250, 0.58);
  --article-panel-strong: rgba(246, 253, 250, 0.78);
}

.article-hero {
  min-height: min(760px, calc(100svh - 78px));
  grid-template-columns: minmax(0, 1fr) minmax(260px, 0.48fr);
}

.article-hero h1 {
  max-width: 11ch;
  color: var(--ink);
  font-size: clamp(3.65rem, 7.2vw, 7.15rem);
  line-height: 0.9;
}

.article-hero .policy-lede {
  max-width: 670px;
}

.article-hero .policy-mark {
  width: min(100%, 380px);
}

.article-shell {
  width: min(100%, 1060px);
  margin: 0 auto;
  border-top: 1px solid var(--policy-line);
}

.article-intro {
  max-width: 860px;
  margin: 0 auto;
  padding: clamp(72px, 10vw, 128px) 0 clamp(64px, 9vw, 108px);
  text-align: center;
}

.article-intro h2,
.article-copy h2,
.article-endnote h2 {
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
  text-wrap: balance;
}

.article-intro h2 {
  margin-bottom: 28px;
  font-size: clamp(3rem, 6.3vw, 5.5rem);
  line-height: 0.92;
}

.article-standfirst {
  max-width: 730px;
  margin: 0 auto;
  color: var(--article-text);
  font-size: clamp(1.18rem, 2vw, 1.48rem);
  line-height: 1.65;
}

.article-section {
  display: grid;
  grid-template-columns: 86px minmax(0, 780px);
  gap: clamp(32px, 5vw, 72px);
  justify-content: center;
  padding: clamp(68px, 9vw, 112px) 0;
  border-top: 1px solid var(--policy-line);
}

.section-number {
  position: sticky;
  top: 110px;
  width: 58px;
  height: 40px;
  display: grid;
  place-items: center;
  margin: 4px 0 0;
  border: 1px solid var(--policy-line);
  border-radius: 999px;
  background: rgba(82, 189, 168, 0.12);
  color: var(--mint-dark);
  font-size: 1.08rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  line-height: 1;
}

.article-copy {
  min-width: 0;
}

.article-copy h2 {
  margin-bottom: 30px;
  font-size: clamp(2.35rem, 4.8vw, 4.35rem);
  line-height: 0.98;
}

.article-copy > p,
.article-endnote > p:not(.kicker) {
  color: var(--article-text);
  font-size: clamp(1.05rem, 1.5vw, 1.18rem);
  line-height: 1.82;
}

.article-copy > p {
  margin-bottom: 1.55em;
}

.article-copy > p:last-child {
  margin-bottom: 0;
}

.article-copy strong {
  color: var(--ink);
  font-weight: 800;
}

.article-figure {
  margin: clamp(42px, 7vw, 66px) 0;
  overflow: hidden;
  border: 1px solid var(--policy-line);
  border-radius: 14px;
  background:
    linear-gradient(145deg, rgba(82, 189, 168, 0.18), rgba(246, 253, 250, 0.22)),
    var(--article-panel-strong);
  box-shadow: 0 24px 60px rgba(29, 42, 38, 0.1);
}

.article-figure a {
  display: grid;
  min-height: 320px;
  place-items: center;
  padding: clamp(24px, 5vw, 52px);
}

.article-figure img {
  width: min(100%, 360px);
  border-radius: 8px;
}

.article-figure figcaption {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 20px clamp(24px, 5vw, 52px) 24px;
  border-top: 1px solid var(--policy-line);
  color: var(--article-text);
  font-size: 0.92rem;
  line-height: 1.5;
}

.article-figure figcaption span {
  flex: 0 0 auto;
  color: var(--mint-dark);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.article-callout {
  display: grid;
  gap: 10px;
  margin: clamp(38px, 6vw, 58px) 0;
  padding: clamp(28px, 4vw, 42px);
  border-left: 5px solid var(--mint);
  border-radius: 0 12px 12px 0;
  background: var(--article-panel);
}

.callout-label,
.formula-card > span {
  color: var(--mint-dark);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.article-callout strong {
  color: var(--ink);
  font-size: clamp(1.45rem, 3vw, 2.2rem);
  line-height: 1.15;
}

.test-steps {
  display: grid;
  gap: 12px;
  margin: clamp(38px, 6vw, 58px) 0;
  padding: 0;
  list-style: none;
}

.test-steps li {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 22px;
  align-items: start;
  padding: clamp(22px, 3vw, 30px);
  border: 1px solid var(--policy-line);
  border-radius: 10px;
  background: var(--article-panel);
}

.test-steps span {
  width: 54px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: rgba(82, 189, 168, 0.14);
  color: var(--mint-dark);
  font-size: 1rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.test-steps p {
  margin: 0;
  color: var(--article-text);
  font-size: clamp(1rem, 1.35vw, 1.1rem);
  line-height: 1.7;
}

.measurement-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  margin: clamp(38px, 6vw, 58px) 0;
  overflow: hidden;
  border: 1px solid var(--policy-line);
  border-radius: 12px;
  background: var(--article-panel);
}

.measurement-grid div {
  min-width: 0;
  display: grid;
  gap: 4px;
  padding: 24px 16px;
  text-align: center;
}

.measurement-grid div + div {
  border-left: 1px solid var(--policy-line);
}

.measurement-grid strong {
  color: var(--ink);
  font-size: clamp(1.6rem, 3vw, 2.25rem);
  line-height: 1;
}

.measurement-grid span {
  color: var(--article-text);
  font-size: 0.78rem;
}

.measurement-grid b {
  margin-top: 8px;
  color: var(--mint-dark);
  font-size: 0.82rem;
}

.formula-card,
.example-card {
  margin: clamp(38px, 6vw, 58px) 0;
  border: 1px solid var(--policy-line);
  border-radius: 12px;
  background:
    linear-gradient(135deg, rgba(82, 189, 168, 0.18), rgba(246, 253, 250, 0.2)),
    var(--article-panel-strong);
}

.formula-card {
  display: grid;
  gap: 18px;
  padding: clamp(30px, 5vw, 50px);
  text-align: center;
}

.formula-card strong {
  overflow-wrap: anywhere;
  color: var(--ink);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: clamp(1.45rem, 4vw, 2.7rem);
  line-height: 1.25;
}

.formula-card sup,
.example-card sup {
  font-size: 0.58em;
}

.example-card {
  padding: clamp(28px, 5vw, 46px);
}

.example-card .kicker {
  margin-bottom: 24px;
}

.example-card p:not(.kicker),
.example-card > strong {
  display: block;
  margin: 0 0 8px;
  color: var(--article-text);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: clamp(1rem, 2vw, 1.28rem);
}

.example-card > strong {
  margin: 18px 0 0;
  color: var(--ink);
  font-size: clamp(1.22rem, 2.6vw, 1.72rem);
}

.article-endnote {
  width: min(100%, 880px);
  margin: clamp(72px, 10vw, 128px) auto 0;
  padding: clamp(40px, 7vw, 72px);
  border: 1px solid var(--policy-line);
  border-radius: 14px;
  background:
    linear-gradient(135deg, rgba(82, 189, 168, 0.24), rgba(246, 253, 250, 0.26)),
    var(--article-panel-strong);
  text-align: center;
  box-shadow: 0 24px 64px rgba(29, 42, 38, 0.1);
}

.article-endnote h2 {
  margin-bottom: 22px;
  font-size: clamp(2.7rem, 6vw, 4.8rem);
  line-height: 0.94;
}

.article-endnote > p:not(.kicker) {
  max-width: 640px;
  margin: 0 auto 30px;
}

.article-endnote a {
  display: inline-flex;
  min-height: 52px;
  align-items: center;
  justify-content: center;
  padding: 14px 24px;
  border: 1px solid var(--mint-dark);
  border-radius: 999px;
  color: var(--mint-dark);
  font-weight: 850;
}

.article-endnote a:hover {
  background: var(--mint-dark);
  color: #f4fffb;
}

html[data-theme="dark"] {
  --article-text: #e6f5f0;
  --article-panel: rgba(42, 48, 46, 0.56);
  --article-panel-strong: rgba(42, 48, 46, 0.72);
}

html[data-theme="dark"] .article-standfirst,
html[data-theme="dark"] .article-copy > p,
html[data-theme="dark"] .article-endnote > p:not(.kicker),
html[data-theme="dark"] .test-steps p,
html[data-theme="dark"] .article-figure figcaption,
html[data-theme="dark"] .measurement-grid span,
html[data-theme="dark"] .example-card p:not(.kicker) {
  color: var(--article-text);
}

html[data-theme="dark"] .article-figure,
html[data-theme="dark"] .formula-card,
html[data-theme="dark"] .example-card,
html[data-theme="dark"] .article-endnote {
  background:
    linear-gradient(135deg, rgba(82, 189, 168, 0.12), rgba(31, 37, 35, 0.28)),
    var(--article-panel-strong);
}

@media (max-width: 820px) {
  .article-hero {
    min-height: 0;
    grid-template-columns: minmax(0, 1fr) 180px;
  }

  .article-section {
    grid-template-columns: 58px minmax(0, 1fr);
    gap: 26px;
  }

  .measurement-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .measurement-grid div:nth-child(4) {
    border-left: 0;
  }

  .measurement-grid div:nth-child(n + 4) {
    border-top: 1px solid var(--policy-line);
  }
}

@media (max-width: 560px) {
  .article-hero {
    grid-template-columns: 1fr;
  }

  .article-hero h1 {
    font-size: clamp(3.1rem, 14.8vw, 4.55rem);
  }

  .article-hero .policy-mark {
    width: min(76vw, 280px);
  }

  .article-intro {
    padding: 58px 0 54px;
  }

  .article-intro h2 {
    font-size: clamp(2.75rem, 13vw, 3.9rem);
  }

  .article-section {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 56px 0;
  }

  .section-number {
    position: static;
  }

  .article-copy h2 {
    font-size: clamp(2.25rem, 11vw, 3.25rem);
  }

  .article-copy > p,
  .article-endnote > p:not(.kicker) {
    font-size: 1.04rem;
    line-height: 1.75;
  }

  .article-figure a {
    min-height: 0;
    padding: 18px;
  }

  .article-figure figcaption {
    display: grid;
    gap: 7px;
    padding: 18px;
  }

  .test-steps li {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 14px;
    padding: 20px 16px;
  }

  .test-steps span {
    width: 48px;
  }

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

  .measurement-grid div:nth-child(3),
  .measurement-grid div:nth-child(5) {
    border-left: 0;
  }

  .measurement-grid div:nth-child(4) {
    border-left: 1px solid var(--policy-line);
  }

  .measurement-grid div:nth-child(n + 3) {
    border-top: 1px solid var(--policy-line);
  }

  .formula-card {
    padding: 28px 18px;
  }

  .article-endnote {
    margin-top: 58px;
    padding: 36px 22px;
  }
}