/* v25: native details/summary; original v24 additions: all rules are scoped to the Linear beginner aids.
   The shared stylesheet and current-topics-v22.css remain unchanged. */
.topic-page .linear-aid {
  min-width: 0;
  margin: 32px 0;
  padding: clamp(16px, 2vw, 26px);
  border: 1.5px solid var(--ink);
  border-radius: 12px;
  background: var(--white);
  box-shadow: 4px 4px 0 var(--ink);
  overflow-wrap: anywhere;
}
.topic-page .linear-aid,
.topic-page .linear-aid * { box-sizing: border-box; }
.topic-page .linear-aid-start { background: var(--topic-soft); margin-top: 38px; }
.topic-page .linear-aid-mini { margin-bottom: 0; }
.topic-page .linear-aid h2,
.topic-page .linear-aid h3,
.topic-page .linear-aid h4 {
  margin: 0 0 14px;
  font-family: var(--font-sans-jp);
  line-height: 1.7;
  letter-spacing: -.02em;
  font-weight: 800;
}
.topic-page .linear-aid h2 { font-size: clamp(21px, 2vw, 26px); }
.topic-page .linear-aid h3 { font-size: clamp(18px, 1.8vw, 22px); }
.topic-page .linear-aid h4 { font-size: 16px; }
.topic-page .linear-aid p { margin: 0 0 16px; font-size: 14px; line-height: 1.95; }
.topic-page .linear-aid p:last-child { margin-bottom: 0; }
.topic-page .linear-aid .linear-aid-kicker {
  display: block;
  margin: 0 0 10px;
  color: var(--blue-deep);
  font-size: 11px;
  font-weight: 900;
  line-height: 1.6;
  letter-spacing: .1em;
}
.topic-page .linear-aid .linear-aid-subtitle { margin-bottom: 22px; }
.linear-aid-one-line { padding: 18px; border: 1px solid var(--ink); border-radius: 8px; background: var(--white); }
.topic-page .linear-aid-one-line h3 { font-size: 15px; margin-bottom: 8px; }
.topic-page .linear-aid .linear-aid-question { font-weight: 700; }
.topic-page .linear-aid .linear-aid-options {
  display: grid;
  gap: 10px;
  padding: 0;
  margin: 20px 0 24px;
  list-style: none;
}
.topic-page .linear-aid-options > li {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  align-items: baseline;
  gap: 12px;
  min-width: 0;
  padding: 14px;
  border: 1px solid #14233840;
  border-radius: 8px;
  background: var(--paper);
}
.linear-aid-option-letter { font-size: 15px; font-weight: 900; color: var(--blue-deep); }
.linear-aid-answer-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: 100%;
  min-height: 46px;
  padding: 11px 18px;
  border: 1.5px solid var(--ink);
  border-radius: 99px;
  background: var(--topic-soft);
  color: var(--ink);
  font-family: inherit;
  font-size: 14px;
  font-weight: 800;
  line-height: 1.6;
  cursor: pointer;
  list-style: none;
}
.linear-aid-answer-toggle:hover { background: #c5ddff; }
.linear-aid-answer-toggle:focus-visible { outline: 3px solid var(--blue-deep); outline-offset: 4px; }
.linear-aid-toggle-symbol { font-size: 20px; line-height: 1; }
.linear-aid-answer { margin-top: 24px; padding: 18px; border-left: 3px solid var(--blue-deep); background: var(--topic-soft); }
.topic-page .linear-aid-answer h3 { font-size: 18px; }
.linear-aid-capacity-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 14px; }
.linear-aid-cell { min-width: 0; padding: 18px; border: 1px solid #14233840; border-radius: 8px; background: var(--paper); }
.linear-aid-check { background: var(--topic-soft); }
.linear-aid-companies { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin: 20px 0; }
.linear-aid-companies > span,
.linear-aid-network-company { display: block; padding: 9px 7px; border: 1px solid var(--ink); border-radius: 7px; background: var(--white); text-align: center; font-size: 15px; font-weight: 800; }
.topic-page .linear-aid .linear-aid-keywords { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0; padding: 0; border: 0; list-style: none; }
.topic-page .linear-aid .linear-aid-keywords > li { position: static; padding: 5px 9px; border: 1px solid #14233840; border-radius: 6px; background: var(--white); font-size: 14px; font-weight: 500; line-height: 1.8; }
.topic-page .linear-aid li::before { content: none; }
.topic-page .linear-aid .linear-aid-emphasis { font-weight: 800; color: var(--blue-deep); }
.topic-page .linear-aid .linear-aid-result { margin: 20px 0 0; font-weight: 700; }
.linear-aid svg { display: block; color: var(--blue-deep); }
.linear-aid svg path { fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.linear-aid-down { width: 24px; height: 28px; margin: 10px auto; }
.linear-aid-point { min-width: 0; margin-top: 24px; padding: 18px; border-left: 3px solid var(--blue-deep); border-radius: 0 8px 8px 0; background: var(--topic-soft); }
.linear-aid-hint { margin-top: 20px; padding-top: 16px; border-top: 1px solid #14233840; }
.linear-aid-hint > span { display: inline-block; margin-bottom: 8px; font-size: 11px; font-weight: 800; color: var(--blue-deep); }
.topic-page .linear-aid-hint p { font-size: 14px; margin-bottom: 7px; }
.linear-aid-worlds { display: grid; grid-template-columns: minmax(0, 1fr); gap: 18px; }
.linear-aid-world { min-width: 0; padding: 18px; border: 1px solid #14233840; border-radius: 8px; background: var(--paper); }
.linear-aid-world-coordinated { background: var(--topic-soft); }
.linear-aid-independent-routes { display: grid; grid-template-columns: minmax(0, 1fr) 30px minmax(0, .95fr); gap: 10px 6px; align-items: center; margin: 22px 0; }
.linear-aid-company { min-width: 0; padding: 10px 7px; border: 1px solid var(--ink); border-radius: 7px; background: var(--white); text-align: center; }
.linear-aid-company strong { display: block; margin-bottom: 6px; font-size: 15px; }
.linear-aid-company span { display: block; font-size: 14px; line-height: 1.7; }
.linear-aid-route { width: 100%; height: 20px; }
.linear-aid-buyer { grid-column: 3; grid-row: 1 / span 4; align-self: stretch; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px; min-width: 0; padding: 14px 9px; border: 1.5px solid var(--blue-deep); border-radius: 8px; background: var(--topic-soft); text-align: center; }
.linear-aid-buyer strong { font-size: 16px; }
.linear-aid-buyer span { font-size: 14px; line-height: 1.9; }
.linear-aid-bubbles { display: grid; gap: 8px; margin: 18px 0 22px; }
.topic-page .linear-aid-bubbles p { margin: 0; padding: 10px 12px; border: 1px solid #14233840; border-radius: 12px 12px 12px 2px; background: var(--white); font-size: 14px; }
.linear-aid-network { position: relative; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px 16px; margin: 22px 0; }
.linear-aid-network > svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.linear-aid-network > svg path { stroke: #225eaf99; vector-effect: non-scaling-stroke; }
.linear-aid-network-company { z-index: 1; }
.topic-page .linear-aid-network .linear-aid-network-center { z-index: 1; grid-column: 1 / -1; margin: 0; padding: 13px 10px; border: 1px solid var(--blue-deep); border-radius: 8px; background: var(--white); text-align: center; font-weight: 800; }
.topic-page .linear-aid .linear-aid-steps { display: grid; gap: 34px; margin: 22px 0 0; padding: 0; border: 0; list-style: none; }
.topic-page .linear-aid-steps > li { position: relative; display: grid; grid-template-columns: 76px minmax(0, 1fr); gap: 16px; min-width: 0; padding: 18px; border: 1px solid #14233840; border-radius: 8px; background: var(--paper); font-weight: 400; }
.linear-aid-step-label { align-self: start; padding: 7px 8px; border: 1px solid var(--blue-deep); border-radius: 6px; background: var(--topic-soft); color: var(--blue-deep); text-align: center; font-size: 12px; font-weight: 900; line-height: 1.7; white-space: nowrap; }
.linear-aid-step-body { min-width: 0; }
.linear-aid-step-connector { position: absolute; bottom: -31px; left: 43px; width: 24px; height: 28px; }
.topic-page .linear-aid .linear-aid-step-question { padding-top: 12px; margin-top: 14px; border-top: 1px solid #14233840; font-weight: 700; }
.topic-page .linear-aid .linear-aid-final-result { display: inline-block; padding: 9px 14px; border: 1px solid var(--blue-deep); border-radius: 6px; background: var(--topic-soft); font-size: 16px; }
@media (min-width: 1100px) {
  .linear-aid-capacity-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr) minmax(0, 1.3fr); }
  .linear-aid-worlds { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 600px) {
  .topic-page .linear-aid { padding: 16px; box-shadow: 3px 3px 0 var(--ink); }
  .linear-aid-one-line,
  .linear-aid-cell,
  .linear-aid-world,
  .linear-aid-point { padding: 14px; }
  .topic-page .linear-aid-options > li { gap: 8px; padding: 12px; }
  .topic-page .linear-aid-steps > li { grid-template-columns: minmax(0, 1fr); gap: 13px; padding: 14px; }
  .linear-aid-step-label { justify-self: start; }
  .linear-aid-step-connector { left: 30px; }
  .linear-aid-independent-routes { grid-template-columns: minmax(0, 1fr) 25px minmax(0, .95fr); gap: 10px 4px; }
  .linear-aid-buyer { padding: 12px 6px; }
}

/* Native disclosure states; browser keyboard semantics and focus stay intact. */
.linear-aid-answer-toggle::-webkit-details-marker { display: none; }
.linear-aid-answer-toggle .linear-aid-toggle-open { display: none; }
.linear-aid-disclosure[open] > .linear-aid-answer-toggle .linear-aid-toggle-closed { display: none; }
.linear-aid-disclosure[open] > .linear-aid-answer-toggle .linear-aid-toggle-open { display: inline; }
.topic-page .topic-publication .linear-publication-date { display: inline-block; }