.article-shell {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: clamp(38px, 7vw, 92px);
  padding: 48px 0 78px;
}
.side-index { position: sticky; top: 24px; align-self: start; }
.side-index h2 { margin: 0 0 15px; color: var(--muted); font-size: 9px; font-weight: 650; letter-spacing: .11em; }
.side-index nav { display: grid; gap: 0; border-top: 1px solid var(--line); }
.side-index a { padding: 10px 0; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 11px; line-height: 1.5; text-decoration: none; }
.side-index a:hover { color: var(--ink); }
.side-note { margin: 20px 0 0; color: var(--muted); font-size: 9px; line-height: 1.7; }
.content { min-width: 0; max-width: 840px; }
.content-section { padding: 0 0 54px; scroll-margin-top: 24px; }
.content-section + .content-section { border-top: 1px solid var(--line); padding-top: 44px; }
.section-kicker { margin: 0 0 7px; color: var(--mint); font-size: 9px; font-weight: 700; letter-spacing: .1em; }
.content h2 { margin: 0 0 18px; font-family: var(--serif); font-size: clamp(29px, 3.4vw, 41px); font-weight: 500; line-height: 1.15; letter-spacing: -.035em; }
.content h3 { margin: 0 0 9px; font-family: var(--serif); font-size: 24px; font-weight: 500; line-height: 1.25; }
.content p { margin: 0 0 15px; color: #536159; font-size: 13px; line-height: 1.9; }
.content p strong { color: var(--ink); }
.lead-box {
  margin: 0 0 28px;
  padding: 24px 26px;
  border-left: 3px solid var(--ochre);
  border-radius: 0 16px 16px 0;
  background: rgba(255,253,247,.7);
}
.lead-box p:last-child { margin-bottom: 0; }
.rule-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 22px 0 0; }
.rule { min-height: 130px; padding: 18px; border: 1px solid var(--line); border-radius: 16px; background: rgba(255,253,247,.55); }
.rule span { color: var(--clay); font-family: var(--serif); font-size: 12px; }
.rule h3 { margin: 22px 0 5px; font-size: 18px; }
.rule p { margin: 0; font-size: 10px; line-height: 1.7; }
.stage-list { display: grid; gap: 10px; }
.stage {
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255,253,247,.62);
  overflow: hidden;
}
.stage summary {
  padding: 19px 21px;
  display: grid;
  grid-template-columns: 54px 1fr auto;
  gap: 15px;
  align-items: center;
  cursor: pointer;
  list-style: none;
}
.stage summary::-webkit-details-marker { display: none; }
.stage summary > span:first-child { color: var(--mint); font-family: var(--serif); font-size: 11px; }
.stage summary h3 { margin: 0; font-size: 20px; }
.stage summary small { display: block; margin-top: 2px; color: var(--muted); font-size: 9px; }
.stage summary::after { content: "+"; color: var(--muted); font-family: var(--serif); font-size: 20px; }
.stage[open] summary::after { content: "−"; }
.stage[open] summary { border-bottom: 1px solid var(--line); background: rgba(70,125,110,.055); }
.stage-body { padding: 21px; }
.stage-body p:last-child { margin-bottom: 0; }
.dod-list { margin: 13px 0 0; padding: 0 0 0 19px; color: #536159; font-size: 12px; line-height: 1.8; }
.dod-list li { padding-left: 3px; }
.dod-list li::marker { color: var(--mint); }
.example { margin-top: 18px; padding: 14px 16px; border-radius: 11px; color: #6c4a29; background: #f3e6cb; font-size: 11px; line-height: 1.75; }
.example strong { color: #50331a; }

.diagnostic-actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 22px 0 34px; }
.question-group { padding: 0 0 45px; }
.question-group + .question-group { border-top: 1px solid var(--line); padding-top: 40px; }
.group-head { display: grid; grid-template-columns: 44px 1fr auto; gap: 16px; align-items: baseline; margin-bottom: 22px; }
.group-letter { display: grid; width: 38px; height: 38px; place-items: center; border-radius: 50%; color: #fff; background: var(--forest); font-family: var(--serif); font-size: 16px; }
.group-head h2 { margin: 0; }
.group-head span { color: var(--muted); font-size: 10px; }
.question { padding: 17px 0; border-top: 1px solid rgba(29,42,36,.09); }
.question:first-of-type { border-top: 0; }
.question h3 { display: grid; grid-template-columns: 38px 1fr; gap: 7px; margin: 0 0 6px; font-family: var(--sans); font-size: 13px; font-weight: 650; line-height: 1.7; }
.question h3 span { color: var(--clay); font-family: var(--serif); font-weight: 500; }
.question p { margin: 0 0 0 45px; font-size: 12px; line-height: 1.8; }
.answer-key { margin-top: 12px; padding: 24px; border-radius: 18px; color: #f4efe3; background: var(--forest); }
.answer-key summary { cursor: pointer; font-family: var(--serif); font-size: 23px; }
.answer-table { width: 100%; margin-top: 20px; border-collapse: collapse; font-size: 11px; line-height: 1.7; }
.answer-table th, .answer-table td { padding: 11px 12px; border-top: 1px solid rgba(255,255,255,.13); text-align: left; vertical-align: top; }
.answer-table th { width: 58px; color: var(--ochre); font-family: var(--serif); font-weight: 500; }
.score-table { width: 100%; margin: 15px 0 0; border-collapse: collapse; font-size: 12px; }
.score-table th, .score-table td { padding: 12px 14px; border-bottom: 1px solid var(--line); text-align: left; }
.score-table th { color: var(--muted); font-size: 9px; font-weight: 650; letter-spacing: .05em; }
.score-table td:first-child { font-family: var(--serif); font-size: 17px; }
.signal-list { margin: 18px 0 0; padding: 0; list-style: none; }
.signal-list li { padding: 10px 0 10px 22px; border-top: 1px solid var(--line); color: #536159; font-size: 11px; }
.signal-list li::before { float: left; margin-left: -22px; color: var(--clay); content: "→"; }

.exam-strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin: 0 0 38px; border: 1px solid var(--line); background: var(--line); }
.exam-strip div { min-height: 116px; padding: 18px; background: var(--surface); }
.exam-strip small { display: block; margin-bottom: 8px; color: var(--muted); font-size: 9px; }
.exam-strip strong { font-family: var(--serif); font-size: 27px; font-weight: 500; line-height: 1.2; }
.exam-strip p { margin: 5px 0 0; color: var(--muted); font-size: 9px; line-height: 1.5; }
.week-plan { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line-strong); }
.week-plan li { display: grid; grid-template-columns: 130px 1fr; gap: 22px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.week-plan time { color: var(--clay); font-family: var(--serif); font-size: 14px; }
.week-plan h3 { margin: 0 0 4px; font-size: 19px; }
.week-plan p { margin: 0; font-size: 11px; }
.daily-table, .map-table { width: 100%; border-collapse: collapse; font-size: 11px; }
.daily-table th, .daily-table td, .map-table th, .map-table td { padding: 12px 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.daily-table th, .map-table th { color: var(--muted); font-size: 9px; font-weight: 650; letter-spacing: .04em; }
.daily-table td:first-child { font-family: var(--serif); font-size: 15px; white-space: nowrap; }
.resource-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.resource-list li { display: grid; grid-template-columns: 120px 1fr; gap: 18px; padding: 14px 0; border-bottom: 1px solid var(--line); font-size: 11px; }
.resource-list span { color: var(--muted); }
.resource-list a { text-underline-offset: 3px; }
.layer { padding: 20px 0; border-top: 1px solid var(--line); }
.layer-head { display: flex; align-items: baseline; justify-content: space-between; gap: 18px; }
.layer h3 { margin: 0; }
.layer-head span { color: var(--muted); font-size: 9px; }
.layer p { margin: 8px 0 0; }
.tag-list { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 13px; }
.tag { padding: 5px 9px; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); font-size: 9px; }

@media (max-width: 820px) {
  .article-shell { grid-template-columns: 1fr; padding-top: 34px; }
  .side-index { position: static; }
  .side-index nav { grid-template-columns: repeat(2, 1fr); }
  .side-index a { padding-right: 10px; }
  .side-note { display: none; }
  .content { max-width: none; }
}
@media (max-width: 620px) {
  .rule-grid, .exam-strip { grid-template-columns: 1fr; }
  .stage summary { grid-template-columns: 40px 1fr auto; padding: 16px; }
  .stage summary h3 { font-size: 18px; }
  .stage-body { padding: 17px; }
  .group-head { grid-template-columns: 38px 1fr; }
  .group-head span { grid-column: 2; }
  .question p { margin-left: 0; }
  .answer-key { padding: 18px; }
  .answer-table th, .answer-table td { padding: 9px 7px; }
  .week-plan li { grid-template-columns: 1fr; gap: 6px; }
  .resource-list li { grid-template-columns: 1fr; gap: 3px; }
  .side-index nav { grid-template-columns: 1fr 1fr; }
}
@media print {
  .site-head, .site-footer, .diagnostic-actions, .back-link { display: none !important; }
  body { background: #fff; }
  .page-wrap { width: 100%; }
  .track-hero { padding-top: 0; }
  .article-shell { display: block; padding: 0; }
  .answer-key { color: #000; background: #fff; border: 1px solid #bbb; }
  .answer-table th, .answer-table td { border-color: #bbb; }
  .answer-table th { color: #000; }
}