/* Imprint: one intro paragraph, one blackboard canvas, one math paragraph. The canvas has three drawings: wide for desktops, two columns for mid-size screens, tall for phones. */
.im-intro { max-width: 760px; margin: 0 0 30px; font-size: 18px; line-height: 1.65; color: var(--ink); }
.im-intro a { color: var(--accent); }
.im-canvas { margin: 0; padding: 0; background: #1d1d1b; border: 1px solid var(--line); }
.im-canvas svg { display: block; width: 100%; height: auto; }
.im-canvas .im-mid, .im-canvas .im-tall { display: none; }
.im-math { max-width: 760px; margin: 30px 0 0; font-size: 18px; line-height: 1.65; color: var(--ink); }
.im-math .katex { font-size: 1.05em; }
.im-math .katex-display { margin: 16px 0; padding: 6px 2px; overflow-x: auto; overflow-y: hidden; }
.im-math .katex-display > .katex, .im-math .im-nobr { white-space: nowrap; }
.im-eq { display: block; }
.im-eq-narrow { display: none; }
.im-qa { margin: 34px 0 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.im-qa > summary { display: flex; align-items: center; justify-content: space-between; gap: 18px; min-height: 52px; padding: 12px 0; cursor: pointer; list-style: none; font-size: 19px; font-weight: 600; color: var(--ink); }
.im-qa > summary::-webkit-details-marker { display: none; }
.im-qa-mark { font: 22px/1 var(--mono); color: var(--accent); transition: transform .2s; }
.im-qa[open] .im-qa-mark { transform: rotate(45deg); }
.im-qa-body { display: grid; gap: 34px; padding: 10px 0 30px; }
.im-qa-item { display: grid; grid-template-columns: minmax(0, 470px) minmax(0, 1fr); gap: 30px; align-items: start; }
.im-qa-fig { margin: 0; background: #1d1d1b; border: 1px solid var(--line); }
.im-qa-fig svg { display: block; width: 100%; height: auto; }
.im-qa-text h3 { margin: 0 0 10px; font-size: 19px; line-height: 1.35; color: var(--ink); }
.im-qa-text p { margin: 0; font-size: 17px; line-height: 1.62; color: var(--ink); }
.im-qa-text p + p { margin-top: 10px; }
.im-qa-text p.im-qa-src { margin-top: 12px; font: 12px/1.7 var(--mono); color: var(--muted); }
.im-qa-src a { color: var(--accent); }
.im-qa-text p.im-qa-note { margin-top: 12px; padding-left: 12px; border-left: 2px solid var(--line); font-size: 15px; line-height: 1.6; color: var(--muted); }
.im-qa-note a { color: var(--accent); }
.im-qa-text .katex { white-space: nowrap; }
.im-after { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 4px 26px; padding-top: 18px; }
.im-credit { margin: 0; font: 10px/1.5 var(--mono); color: var(--muted); }
.im-sources { display: flex; gap: 26px; font-size: 12px; }
.im-sources a { display: inline-flex; align-items: center; min-height: 44px; color: var(--accent); }
@media (max-width: 1199px) {
  .im-canvas .im-wide { display: none; }
  .im-canvas .im-mid { display: block; }
}
@media (max-width: 999px) {
  .im-canvas .im-mid { display: none; }
  .im-canvas .im-tall { display: block; max-width: 584px; margin: 0 auto; }
}
@media (max-width: 860px) {
  .im-qa-item { grid-template-columns: minmax(0, 1fr); gap: 14px; }
}
@media (max-width: 700px) {
  .im-qa > summary { font-size: 17px; }
  .im-qa-text p { font-size: 16px; line-height: 1.6; }
  .im-intro { margin-bottom: 24px; font-size: 16px; line-height: 1.6; }
  .im-canvas { margin: 0 -1px; }
  .im-math { margin-top: 24px; font-size: 16px; line-height: 1.6; }
  .im-eq-wide { display: none; }
  .im-eq-narrow { display: block; }
  .im-after { flex-direction: column; align-items: start; }
}