/* ─── Blog post: essay-prose + right-rail ToC + scenario-stack (blog/ai-agents-need-screens.html) ─── */
.essay { display: flex; flex-direction: column; }
.container-essay { max-width: 1080px; }

.essay-header { padding-top: clamp(80px, 10vw, 140px); padding-bottom: 32px; }
.essay-back {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: var(--track-wide-3);
  text-transform: uppercase; color: var(--fg-secondary);
  text-decoration: none; margin-bottom: 28px;
  transition: color 0.2s ease;
}
.essay-back:hover { color: var(--fg-primary); }

.essay-eyebrow {
  display: flex; flex-wrap: wrap; gap: 12px; align-items: center;
  margin-bottom: 24px;
}
.essay-meta-sep { color: var(--fg-tertiary); }
.essay-date {
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: var(--track-wide-3); text-transform: uppercase;
  color: var(--fg-secondary);
}
.essay-title {
  font-size: clamp(28px, 3.5vw, 40px);
  font-weight: 700; letter-spacing: -0.02em; line-height: 1.15;
  margin: 0 0 20px 0; color: var(--fg-primary);
}
.essay-lede {
  font-size: 20px; line-height: 1.5; color: var(--fg-secondary);
  max-width: 760px; margin: 0 0 28px 0;
}
.essay-byline {
  display: flex; flex-wrap: wrap; gap: 12px; align-items: center;
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: var(--track-wide-3); text-transform: uppercase;
  color: var(--fg-tertiary);
}

.essay-grid {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 64px;
  align-items: start;
}
.essay-toc {
  position: sticky; top: 100px;
  padding: 24px 0 0 0;
  border-top: 1px solid var(--border-soft);
}
.essay-toc-label {
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: var(--track-wide-3); text-transform: uppercase;
  color: var(--fg-tertiary);
  display: block; margin-bottom: 16px;
}
.essay-toc ol {
  list-style: none; counter-reset: toc;
  padding: 0; margin: 0;
}
.essay-toc li {
  counter-increment: toc;
  padding: 8px 0;
  border-bottom: 1px solid var(--border-soft);
  display: flex; gap: 8px; align-items: baseline;
}
.essay-toc li::before {
  content: counter(toc, decimal-leading-zero);
  font-family: var(--font-mono); color: var(--fg-tertiary);
  font-size: 11px; letter-spacing: var(--track-wide-3);
  flex-shrink: 0;
}
.essay-toc a {
  color: var(--fg-secondary); text-decoration: none;
  font-size: 13px; line-height: 1.4;
  transition: color 0.2s ease;
}
.essay-toc a:hover { color: var(--fg-primary); }

.essay-prose {
  font-size: 17px; line-height: 1.7;
  color: var(--fg-primary);
  max-width: 760px;
}
.essay-prose h2 {
  font-size: clamp(22px, 2.5vw, 28px);
  font-weight: 700; letter-spacing: -0.01em;
  margin: 56px 0 20px 0;
  padding-top: 24px;
  border-top: 1px solid var(--border-soft);
  color: var(--fg-primary);
}
.essay-prose h2:first-child {
  margin-top: 0; padding-top: 0; border-top: none;
}
.essay-prose h3 {
  font-size: 18px; font-weight: 600;
  margin: 36px 0 12px 0;
  color: var(--fg-primary);
}
.essay-prose p {
  margin: 0 0 20px 0;
  color: var(--fg-secondary);
}
.essay-prose ol, .essay-prose ul {
  margin: 0 0 24px 24px;
  color: var(--fg-secondary);
}
.essay-prose li {
  margin-bottom: 8px;
  line-height: 1.6;
}
.essay-prose strong { color: var(--fg-primary); font-weight: 600; }
.essay-prose em { color: var(--fg-primary); font-style: italic; }
.essay-prose a {
  color: var(--accent-base); text-decoration: none;
  border-bottom: 1px solid var(--accent-tint);
  transition: border-color 0.2s ease;
}
.essay-prose a:hover { border-bottom-color: var(--accent-base); }
.essay-prose code {
  font-family: var(--font-mono); font-size: 14px;
  background: var(--ink-700);
  padding: 2px 6px; border-radius: 4px;
  color: var(--accent-base);
}

.pull-quote {
  font-family: var(--font-sans);
  font-size: clamp(20px, 2.2vw, 26px);
  line-height: 1.4; font-weight: 600;
  letter-spacing: -0.01em; font-style: italic;
  color: var(--fg-primary);
  margin: 48px 0;
  padding: 8px 0 8px 24px;
  border-left: 2px solid var(--accent-base);
  max-width: 760px;
}

/* DISTINGUISHING PRIMITIVE — scenario-stack */
.scenario-stack {
  margin: 48px 0;
  padding: 0;
  background: var(--border-soft);
  display: flex; flex-direction: column;
  gap: 1px;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-soft);
}
.scenario-stack-label {
  display: block;
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: var(--track-wide-3); text-transform: uppercase;
  color: var(--fg-tertiary);
  padding: 16px 24px;
  background: var(--ink-700);
}
.scenario-row {
  display: grid;
  grid-template-columns: 72px 1fr;
  background: var(--ink-700);
  padding: 24px;
  gap: 20px;
  align-items: start;
}
.scenario-num {
  font-family: var(--font-mono); font-size: 22px; font-weight: 500;
  color: var(--accent-base); letter-spacing: -0.02em;
  line-height: 1;
}
.scenario-body h4 {
  font-size: 16px; font-weight: 600;
  margin: 0 0 8px 0;
  color: var(--fg-primary);
  letter-spacing: -0.005em;
}
.scenario-body p {
  font-size: 15px; line-height: 1.6;
  color: var(--fg-secondary);
  margin: 0 0 10px 0;
}
.scenario-body p:last-child { margin-bottom: 0; }
.scenario-body .scenario-answer {
  color: var(--fg-primary);
  padding-left: 14px;
  border-left: 2px solid var(--accent-base);
  margin-top: 12px;
}

.essay-footer { padding-top: 32px; padding-bottom: 32px; }
.related-posts { padding-top: 32px; border-top: 1px solid var(--border-soft); }
.related-posts-title {
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: var(--track-wide-3); text-transform: uppercase;
  color: var(--fg-tertiary);
  margin: 0 0 24px 0; font-weight: 500;
}
.related-posts-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border-soft);
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-soft);
}
.related-post-card {
  display: flex; flex-direction: column;
  gap: 12px;
  padding: 24px;
  background: var(--ink-700);
  text-decoration: none;
  color: var(--fg-primary);
  min-height: 160px;
  transition: background 0.2s ease;
}
.related-post-card:hover { background: var(--ink-600); }
.related-post-card .tag-chip { align-self: flex-start; }
.related-post-card h4 {
  font-size: 16px; font-weight: 600; line-height: 1.35;
  margin: 0; color: var(--fg-primary);
  letter-spacing: -0.005em;
}
.related-meta {
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: var(--track-wide-3); text-transform: uppercase;
  color: var(--fg-tertiary);
  margin-top: auto;
}

@media (max-width: 1024px) {
  .essay-grid { grid-template-columns: 1fr; gap: 32px; }
  .essay-toc { position: static; }
  .related-posts-list { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .related-posts-list { grid-template-columns: 1fr; }
  .scenario-row { grid-template-columns: 56px 1fr; padding: 20px; gap: 14px; }
  .essay-prose { font-size: 16px; }
}