/* Guide articles: a dark hero that answers first, a porcelain reading field, then the way onward */

.display em { color: var(--spectral); }

.crumbs {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0 0.6rem;
  color: var(--muted-dark);
  font-size: var(--t-label);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.crumbs a { min-height: 44px; display: inline-flex; align-items: center; text-decoration: none; transition: color var(--fast) var(--ease-out); }
.crumbs a:hover { color: var(--porcelain); }
.crumbs span[aria-hidden] { color: var(--scarlet); }
.crumbs [aria-current] { color: var(--porcelain); }

/* Hero */

.a-hero {
  padding: 8rem var(--gutter) clamp(3.5rem, 7vw, 5.5rem);
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: clamp(1rem, 2vw, 2rem);
  background:
    radial-gradient(56rem 36rem at 92% 0%, oklch(57% 0.2 258 / 0.14), transparent 70%),
    var(--mineral);
}
.a-hero-copy { grid-column: 1 / span 9; }

.a-title {
  margin: 1rem 0 0;
  font-family: var(--serif);
  font-size: clamp(2.5rem, 5.2vw, 5.25rem);
  line-height: 1;
  letter-spacing: -0.035em;
}
.a-title em { color: var(--scarlet); }
.js .a-title { animation: a-rise var(--reveal) var(--ease-out) both; }
@keyframes a-rise { from { opacity: 0; transform: translateY(0.3em); } to { opacity: 1; transform: none; } }

.a-answer {
  max-width: 62ch;
  margin: 2.5rem 0 0;
  padding-top: 1.25rem;
  border-top: 2px solid var(--scarlet);
  font-size: var(--t-lead);
  line-height: 1.55;
}
.a-answer b {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--scarlet-bright);
  font-size: var(--t-label);
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.a-byline {
  margin: 2.25rem 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem clamp(1.5rem, 3vw, 2.75rem);
}
.a-byline dt { color: var(--muted-dark); font-size: var(--t-label); font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; }
.a-byline dd { margin: 0.4rem 0 0; font-weight: 650; }
.a-byline a { text-decoration-color: var(--scarlet); text-decoration-thickness: 1.5px; text-underline-offset: 0.25em; }

/* Reading field */

.a-body {
  padding: clamp(4rem, 8vw, 7rem) var(--gutter) var(--section);
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: clamp(1rem, 2vw, 2rem);
  align-items: start;
  background: var(--porcelain);
  color: var(--mineral);
  --focus: var(--scarlet-ink);
}
.a-body ::selection { background: var(--mineral); color: var(--porcelain); }

.a-toc { position: sticky; top: 6.5rem; grid-column: 1 / span 3; }
.a-toc summary {
  margin-bottom: 1rem;
  color: var(--muted-light);
  font-size: var(--t-label);
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  list-style: none;
}
.a-toc summary::-webkit-details-marker { display: none; }
.a-toc ol { margin: 0; padding: 0; list-style: none; display: grid; border-left: 1px solid var(--line-light); }
.a-toc a {
  position: relative;
  min-height: 44px;
  padding: 0.55rem 0 0.55rem 1rem;
  display: flex;
  align-items: center;
  color: var(--muted-light);
  font-size: 0.875rem;
  font-weight: 650;
  line-height: 1.35;
  text-decoration: none;
  transition: color var(--fast) var(--ease-out);
}
.a-toc a::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 0.55rem;
  bottom: 0.55rem;
  width: 1px;
  background: transparent;
  transition: background-color var(--fast) var(--ease-out);
}
.a-toc a:hover { color: var(--mineral); }
.a-toc a[aria-current="true"] { color: var(--mineral); }
.a-toc a[aria-current="true"]::before { background: var(--scarlet-ink); width: 2px; }

.a-main { grid-column: 4 / span 7; min-width: 0; }

.a-takeaways {
  margin: 0 0 clamp(2.5rem, 5vw, 3.5rem);
  padding: clamp(1.5rem, 3vw, 2rem);
  border-radius: 6px;
  background: var(--porcelain-deep);
}
.a-takeaways h2 { margin: 0 0 1rem; font-size: var(--t-label); font-weight: 800; letter-spacing: 0.1em; text-transform: uppercase; }
.a-takeaways ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 0.75rem; counter-reset: point; }
.a-takeaways li { counter-increment: point; position: relative; padding-left: 2rem; font-weight: 600; line-height: 1.5; }
.a-takeaways li::before { content: counter(point, decimal-leading-zero); position: absolute; left: 0; top: 0.1rem; color: var(--scarlet-ink); font-size: 0.8125rem; font-weight: 800; font-variant-numeric: tabular-nums; }

.prose { font-size: 1.125rem; line-height: 1.75; }
.prose > * { max-width: 68ch; }
.prose > :first-child { margin-top: 0; }
.prose p { margin: 0 0 1.25rem; }
.prose h2 {
  margin: clamp(3rem, 6vw, 4.5rem) 0 1.25rem;
  font-family: var(--serif);
  font-size: clamp(1.85rem, 3vw, 2.75rem);
  line-height: 1.08;
  letter-spacing: -0.025em;
}
.prose h3 { margin: 2.25rem 0 0.75rem; font-size: 1.25rem; font-weight: 750; line-height: 1.35; }
.prose ul, .prose ol { margin: 0 0 1.5rem; padding-left: 1.4rem; }
.prose li { margin: 0 0 0.6rem; padding-left: 0.3rem; }
.prose li::marker { color: var(--scarlet-ink); font-weight: 800; }
.prose strong { font-weight: 750; }
.prose a { color: var(--mineral); font-weight: 650; text-decoration-color: var(--scarlet-ink); text-decoration-thickness: 1.5px; text-underline-offset: 0.2em; transition: color var(--fast) var(--ease-out); }
.prose a:hover { color: var(--scarlet-ink); }
.prose code {
  padding: 0.05em 0.35em;
  border-radius: 4px;
  background: oklch(13% 0.018 225 / 0.07);
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.86em;
}

.prose .callout {
  margin: 2rem 0;
  padding: 1.35rem 1.6rem;
  border-radius: 6px;
  background: var(--mineral);
  color: var(--porcelain);
  font-size: var(--t-lead);
  font-weight: 600;
  line-height: 1.5;
}
.prose .callout a { color: var(--porcelain); text-decoration-color: var(--scarlet); }
.prose .callout strong { color: var(--spectral); }

.prose .sample {
  margin: 2rem 0;
  padding: 1.5rem 1.6rem 0.4rem;
  border: 1.5px dashed var(--line-light-strong);
  border-radius: 6px;
}
.prose .sample::before {
  content: "Sample business · illustrative";
  display: block;
  margin-bottom: 0.9rem;
  color: var(--muted-light);
  font-size: var(--t-label);
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.prose .table-wrap { max-width: none; margin: 2rem 0; overflow-x: auto; }
.prose table { width: 100%; min-width: 34rem; border-collapse: collapse; font-size: 1rem; line-height: 1.5; text-align: left; }
.prose th, .prose td { padding: 0.9rem 1.25rem 0.9rem 0; border-top: 1px solid var(--line-light); vertical-align: top; }
.prose thead th { padding-top: 0; border-top: 0; font-size: var(--t-label); font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase; }
.prose tbody th { font-weight: 750; }

/* Topic index on a main page */

.a-cluster { padding: var(--section) var(--gutter); background: var(--raised); }
.a-split {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: clamp(1rem, 2vw, 2rem);
  row-gap: 2rem;
  align-items: end;
}
.a-split .display { grid-column: 1 / span 7; }
.a-split > p { grid-column: 9 / -1; max-width: 38ch; margin: 0; color: var(--muted-dark); font-size: var(--t-lead); line-height: 1.5; }

/* FAQ */

.a-faq { padding: var(--section) var(--gutter); background: var(--mineral); }
.a-faq-list {
  margin: clamp(3rem, 6vw, 4.5rem) 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 clamp(2rem, 6vw, 6rem);
}
.a-faq-list div { padding: 1.5rem 0 1.75rem; border-top: 1px solid var(--line-dark); }
.a-faq-list dt { font-size: 1.125rem; font-weight: 750; line-height: 1.35; }
.a-faq-list dd { max-width: 58ch; margin: 0.6rem 0 0; color: var(--muted-dark); line-height: 1.65; }

/* Related */

.a-related { padding: 0 var(--gutter) var(--section); background: var(--mineral); }
.a-related-head { margin: 0; padding-top: 2rem; border-top: 1px solid var(--line-dark-strong); font-family: var(--serif); font-size: var(--t-title); line-height: 1; letter-spacing: -0.03em; }
.a-related .cluster-list { margin-top: clamp(2rem, 4vw, 3rem); }

/* Guides hub */

.h-hero { padding-bottom: clamp(4rem, 8vw, 6.5rem); }
.h-lead { max-width: 58ch; margin: 2rem 0 0; color: var(--muted-dark); font-size: var(--t-lead); line-height: 1.55; }
.h-jump { margin: 2.5rem 0 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 0.6rem; }
.h-jump a {
  min-height: 44px;
  padding: 0 1.1rem;
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line-dark-strong);
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 650;
  text-decoration: none;
  transition: background-color var(--fast) var(--ease-out), color var(--fast) var(--ease-out), border-color var(--fast) var(--ease-out);
}
.h-jump a:hover { background: var(--porcelain); border-color: var(--porcelain); color: var(--mineral); }

.h-topic {
  padding: clamp(4rem, 8vw, 6.5rem) var(--gutter);
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: clamp(1rem, 2vw, 2rem);
  row-gap: 2.5rem;
  align-items: start;
  border-top: 1px solid var(--line-dark);
}
.h-topic:nth-child(odd) { background: var(--raised); }
.h-topic-head { position: sticky; top: 6.5rem; grid-column: 1 / span 4; }
.h-topic-n { color: var(--spectral); font-size: 0.8125rem; font-weight: 800; font-variant-numeric: tabular-nums; }
.h-topic-head h2 { margin: 0.75rem 0 0; font-family: var(--serif); font-size: var(--t-title); line-height: 1; letter-spacing: -0.03em; }
.h-topic-head p { max-width: 38ch; margin: 1.25rem 0 0.75rem; color: var(--muted-dark); line-height: 1.6; }
.h-topic-list { grid-column: 6 / -1; }
.h-topic-main {
  min-height: 44px;
  padding: 1.5rem 1.6rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 2rem;
  gap: 0.5rem 1rem;
  border-radius: 6px;
  background: var(--porcelain);
  color: var(--mineral);
  text-decoration: none;
}
.h-topic-main small { color: var(--scarlet-ink); font-size: var(--t-label); font-weight: 800; letter-spacing: 0.1em; text-transform: uppercase; }
.h-topic-main b { grid-column: 1; font-family: var(--serif); font-size: clamp(1.5rem, 2.4vw, 2.1rem); font-weight: 400; line-height: 1.1; letter-spacing: -0.02em; }
.h-topic-main svg { grid-column: 2; grid-row: 1 / span 2; align-self: center; justify-self: end; width: 1.3rem; fill: none; stroke: var(--scarlet-ink); stroke-width: 2; transition: transform var(--normal) var(--ease-out); }
.h-topic-main:hover svg { transform: translate(3px, -3px); }
.h-topic-list .cluster-list { margin-top: 1rem; }

/* Responsive */

@media (max-width: 1100px) {
  .a-hero-copy { grid-column: 1 / -1; }
  .a-toc { grid-column: 1 / span 3; }
  .a-main { grid-column: 4 / -1; }
}

@media (max-width: 860px) {
  .a-hero { padding-top: 6.5rem; }
  .a-body { display: block; }
  .a-toc { position: static; margin-bottom: 2.5rem; padding: 1rem 1.25rem; border-radius: 6px; background: var(--porcelain-deep); }
  .a-toc summary { min-height: 44px; margin: 0; display: flex; align-items: center; justify-content: space-between; cursor: pointer; }
  .a-toc summary::after { content: "+"; font-size: 1.25rem; font-weight: 500; }
  .a-toc details[open] summary { margin-bottom: 0.5rem; }
  .a-toc details[open] summary::after { content: "−"; }
  .a-split .display, .a-split > p { grid-column: 1 / -1; }
  .a-faq-list { grid-template-columns: minmax(0, 1fr); }
  .h-topic-head { position: static; grid-column: 1 / -1; }
  .h-topic-list { grid-column: 1 / -1; }
  .prose { font-size: 1.0625rem; }
}

@media (prefers-reduced-motion: reduce) {
  .js .a-title { animation: none; }
}