:root {
  --article-max: 740px;
}

.article-page {
  background: #ffffff;
}

.article-hero {
  background:
    radial-gradient(ellipse 46% 80% at 92% 0%, rgba(45, 216, 122, 0.16), transparent),
    radial-gradient(ellipse 56% 90% at 4% 0%, rgba(20, 87, 184, 0.34), transparent),
    linear-gradient(150deg, var(--navy), var(--navy-2));
  color: white;
}

.article-hero-inner {
  margin: 0 auto;
  max-width: 980px;
  padding: clamp(3.5rem, 8vw, 7rem) 1.25rem clamp(3.8rem, 8vw, 6.5rem);
}

.breadcrumb {
  align-items: center;
  color: rgba(255, 255, 255, 0.68);
  display: flex;
  flex-wrap: wrap;
  font-size: 0.82rem;
  font-weight: 750;
  gap: 0.55rem;
  margin-bottom: 2rem;
}

.breadcrumb a {
  color: white;
  text-underline-offset: 0.22rem;
}

.article-hero h1 {
  font-size: clamp(2.8rem, 7vw, 5.8rem);
  letter-spacing: -0.055em;
  line-height: 0.98;
  margin: 0;
  max-width: 940px;
  text-wrap: balance;
}

.article-summary {
  color: rgba(255, 255, 255, 0.78);
  font-size: clamp(1.08rem, 2vw, 1.35rem);
  line-height: 1.65;
  margin: 1.5rem 0 0;
  max-width: 780px;
}

.article-byline {
  align-items: center;
  color: rgba(255, 255, 255, 0.66);
  display: flex;
  flex-wrap: wrap;
  font-size: 0.82rem;
  font-weight: 750;
  gap: 0.55rem;
  margin-top: 1.6rem;
}

.article-byline a {
  color: white;
}

.article-layout {
  display: grid;
  gap: clamp(2.5rem, 6vw, 6rem);
  grid-template-columns: 220px minmax(0, var(--article-max));
  justify-content: center;
  margin: 0 auto;
  max-width: 1080px;
  padding: clamp(3rem, 7vw, 6rem) 1.25rem clamp(5rem, 10vw, 9rem);
}

.article-toc {
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: 0.72rem;
  position: sticky;
  top: 2rem;
}

.article-toc strong {
  font-size: 0.72rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.article-toc a {
  border-left: 2px solid var(--line);
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.35;
  padding: 0.15rem 0 0.15rem 0.8rem;
  text-decoration: none;
}

.article-toc a:hover,
.article-toc a:focus-visible {
  border-left-color: var(--green);
  color: var(--ink);
}

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

.article-content > :first-child {
  margin-top: 0;
}

.article-content h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.042em;
  line-height: 1.06;
  margin: 4.5rem 0 1rem;
  scroll-margin-top: 2rem;
  text-wrap: balance;
}

.article-content h3 {
  font-size: 1.4rem;
  letter-spacing: -0.02em;
  line-height: 1.22;
  margin: 2.6rem 0 0.65rem;
}

.article-content p,
.article-content li {
  color: #34445d;
  font-size: 1.05rem;
  line-height: 1.78;
}

.article-content p {
  margin: 0 0 1.35rem;
}

.article-content ul,
.article-content ol {
  margin: 0.6rem 0 1.6rem;
  padding-left: 1.3rem;
}

.article-content li + li {
  margin-top: 0.58rem;
}

.article-content a:not(.article-tool-link):not(.related-link) {
  color: var(--blue);
  font-weight: 750;
  text-underline-offset: 0.2rem;
}

.quick-answer {
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  font-size: 1.28rem;
  line-height: 1.65;
  margin-bottom: 3rem;
  padding-bottom: 2.3rem;
}

.quick-answer strong {
  color: var(--blue);
}

.article-callout {
  background: var(--blue-light);
  border-left: 4px solid var(--blue);
  margin: 2rem 0;
  padding: 1.25rem 1.35rem;
}

.article-callout strong {
  color: var(--ink);
  display: block;
  margin-bottom: 0.4rem;
}

.article-callout p:last-child,
.article-callout ul:last-child {
  margin-bottom: 0;
}

.math-example {
  background: var(--navy);
  color: white;
  margin: 2rem 0;
  padding: 1.4rem;
}

.math-example strong,
.math-example span {
  display: block;
}

.math-example strong {
  color: var(--green);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  margin-bottom: 0.55rem;
  text-transform: uppercase;
}

.math-example span {
  font-size: clamp(1.1rem, 3vw, 1.45rem);
  font-weight: 850;
  line-height: 1.45;
}

.table-scroll {
  margin: 2rem 0;
  overflow-x: auto;
}

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

.article-table caption {
  color: var(--muted);
  font-size: 0.84rem;
  padding-bottom: 0.7rem;
  text-align: left;
}

.article-table th,
.article-table td {
  border-bottom: 1px solid var(--line);
  padding: 0.9rem 0.75rem;
  text-align: left;
  vertical-align: top;
}

.article-table th {
  color: var(--ink);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.article-table td {
  color: #34445d;
  font-size: 0.94rem;
}

.article-checklist {
  border-bottom: 1px solid var(--line);
  border-top: 1px solid var(--line);
  list-style: none;
  padding: 1.2rem 0 !important;
}

.article-checklist li {
  padding-left: 1.85rem;
  position: relative;
}

.article-checklist li::before {
  color: var(--green-dark);
  content: "✓";
  font-weight: 900;
  left: 0;
  position: absolute;
}

.article-faq details {
  border-top: 1px solid var(--line);
  padding: 1.15rem 0;
}

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

.article-faq summary {
  color: var(--ink);
  cursor: pointer;
  font-size: 1.06rem;
  font-weight: 850;
}

.article-faq details p {
  margin: 0.85rem 0 0;
}

.article-tool-link {
  align-items: center;
  background: linear-gradient(135deg, var(--blue), #0d3f89);
  color: white;
  display: flex;
  gap: 2rem;
  justify-content: space-between;
  margin-top: 4.5rem;
  padding: 1.5rem;
  text-decoration: none;
}

.article-tool-link strong,
.article-tool-link span {
  display: block;
}

.article-tool-link strong {
  font-size: 1.2rem;
}

.article-tool-link span {
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.9rem;
  margin-top: 0.25rem;
}

.article-tool-link .article-tool-arrow {
  color: var(--green);
  flex: 0 0 auto;
  font-size: 1.8rem;
  margin: 0;
}

.article-tool-link:hover,
.article-tool-link:focus-visible {
  background: linear-gradient(135deg, #1763d2, #0c3778);
}

.related-reading {
  margin-top: 4rem;
}

.related-reading h2 {
  font-size: 1.7rem;
  margin: 0 0 1rem;
}

.related-links {
  border-top: 1px solid var(--line);
  display: grid;
}

.related-link {
  align-items: center;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  display: flex;
  font-weight: 850;
  gap: 1rem;
  justify-content: space-between;
  padding: 1rem 0;
  text-decoration: none;
}

.related-link:hover,
.related-link:focus-visible {
  color: var(--blue);
}

.editorial-note {
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.6;
  margin-top: 3rem;
}

@media (max-width: 820px) {
  .article-layout {
    grid-template-columns: 1fr;
  }

  .article-toc {
    border-bottom: 1px solid var(--line);
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    padding-bottom: 1.6rem;
    position: static;
  }

  .article-toc strong {
    grid-column: 1 / -1;
  }
}

@media (max-width: 560px) {
  .article-hero-inner {
    padding: 3.2rem 1rem 3.8rem;
  }

  .breadcrumb {
    margin-bottom: 1.5rem;
  }

  .article-hero h1 {
    font-size: 2.75rem;
  }

  .article-summary {
    font-size: 1.04rem;
  }

  .article-layout {
    gap: 2.5rem;
    padding: 2.8rem 1rem 5rem;
  }

  .article-toc {
    grid-template-columns: 1fr;
  }

  .article-toc strong {
    grid-column: auto;
  }

  .article-content h2 {
    font-size: 2rem;
    margin-top: 3.7rem;
  }

  .article-content h3 {
    font-size: 1.28rem;
  }

  .article-content p,
  .article-content li {
    font-size: 1rem;
  }

  .article-tool-link {
    align-items: flex-start;
    gap: 1rem;
  }
}

@media print {
  .blog-header,
  .blog-footer,
  .article-toc,
  .article-tool-link,
  .related-reading {
    display: none;
  }

  .article-hero {
    background: white;
    color: black;
  }

  .article-summary,
  .article-byline {
    color: #34445d;
  }

  .article-layout {
    display: block;
    padding: 2rem 0;
  }
}