/* Math formula reference. Uses the shared portal palette (portal.css --ezp-*); prints as a compact 2–4 page sheet. */
.mr-page {
  --mr-ink: var(--ezp-ink, #182238);
  --mr-muted: #64748b;
  --mr-rule: #e3e6ef;
  --mr-hi: var(--ezp-brand, #3346b8);
  --mr-fill: var(--ezp-brand-soft, #eef1ff);
  --mr-math: "Cambria Math", "STIX Two Math", "Latin Modern Math", "Times New Roman", serif;
  max-width: 1240px; margin: 0 auto; padding: 24px 32px 56px; color: var(--mr-ink); font-size: 15px; line-height: 1.5;
}
.mr-page *, .mr-page *::before, .mr-page *::after { box-sizing: border-box; }
.mr-page a:focus-visible, .mr-page button:focus-visible { outline: 3px solid var(--ezp-brand); outline-offset: 2px; }
.mr-page h2[tabindex]:focus, .mr-page h1[tabindex]:focus { outline: none; }
.mr-page h2[tabindex]:focus-visible { outline: 3px solid var(--ezp-brand); outline-offset: 4px; border-radius: 4px; }

.mr-crumbs { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; font-size: 13px; color: var(--mr-muted); margin-bottom: 12px; }
.mr-crumbs a { color: inherit; font-weight: 600; text-decoration: none; }
.mr-crumbs a:hover { color: var(--ezp-brand-strong); text-decoration: underline; }
.mr-crumbs b { color: var(--mr-ink); }

.mr-hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(260px, 360px); gap: 20px 32px; align-items: end; padding: 28px; border-radius: 14px; color: #fff;
  background: linear-gradient(135deg, var(--ezp-brand-deep, #1e2c70), var(--ezp-brand-strong, #293a9e)); box-shadow: 0 10px 28px rgb(30 44 112 / .18); margin-bottom: 24px; }
.mr-eyebrow { margin: 0 0 6px; font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--ezp-brand-on-dark, #dce3ff); }
.mr-hero h1 { margin: 0 0 8px; font-size: 34px; line-height: 1.15; }
.mr-lede { margin: 0; max-width: 62ch; color: #e8ecff; font-size: 16px; }
.mr-hero-side { display: grid; gap: 14px; }
.mr-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.mr-btn { display: inline-flex; align-items: center; justify-content: center; min-height: 40px; padding: 8px 16px; border-radius: 8px; border: 1px solid #fff; background: transparent; color: #fff; font-weight: 600; font-size: 14px; text-decoration: none; cursor: pointer; }
.mr-btn--primary { background: #fff; color: var(--ezp-brand-strong); }
.mr-btn:hover { background: rgb(255 255 255 / .14); }
.mr-btn--primary:hover { background: var(--ezp-brand-soft); }
.mr-hero .mr-btn:focus-visible { outline-color: #fff; }
.mr-kbd { margin-left: 8px; padding: 0 6px; border: 1px solid currentColor; border-radius: 5px; font: 600 11px ui-monospace, Consolas, monospace; opacity: .8; }
.mr-session, .mr-session-status { margin: 0; font-size: 13.5px; line-height: 1.45; color: #e8ecff; }
.mr-session-status:empty { display: none; }
.mr-session-status { font-weight: 600; color: #fff; }

.mr-layout { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 28px; align-items: start; }
.mr-toc { position: sticky; top: 16px; padding: 14px; background: #fff; border: 1px solid var(--mr-rule); border-radius: 12px; }
.mr-toc-h { margin: 0 0 8px; font-size: 12px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--mr-muted); }
.mr-toc ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.mr-toc a { display: flex; align-items: center; justify-content: space-between; gap: 8px; min-height: 40px; padding: 8px 10px; border-radius: 8px; color: var(--mr-ink); font-weight: 600; font-size: 14px; text-decoration: none; }
.mr-toc a:hover { background: var(--ezp-brand-soft); color: var(--ezp-brand-strong); }
.mr-count { min-width: 22px; padding: 0 6px; border-radius: 999px; background: #f1f3f8; color: var(--mr-muted); font-size: 12px; text-align: center; }

.mr-body { display: grid; gap: 32px; min-width: 0; }
.mr-domain { scroll-margin-top: 16px; --dc: var(--ezp-brand, #3346b8); --dc-soft: var(--ezp-brand-soft, #eef1ff); }
.mr-domain--advanced-math { --dc: #5b3db8; --dc-soft: #f1ecff; }
.mr-domain--data { --dc: var(--ezp-teal, #0f766e); --dc-soft: var(--ezp-teal-soft, #e2f4f1); }
.mr-domain--geometry { --dc: var(--ezp-amber, #8a4b00); --dc-soft: var(--ezp-amber-soft, #fff2da); }
.mr-domain-h { display: flex; gap: 14px; align-items: flex-start; margin-bottom: 14px; }
.mr-dnum { display: grid; place-items: center; flex: 0 0 36px; height: 36px; border-radius: 10px; background: var(--dc-soft); color: var(--dc); font-weight: 800; }
.mr-domain-h h2 { margin: 0; font-size: 24px; }
.mr-domain-h p { margin: 2px 0 0; color: var(--mr-muted); font-size: 14px; }

.mr-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.mr-card { min-width: 0; background: #fff; border: 1px solid var(--mr-rule); border-top: 3px solid var(--dc); border-radius: 12px; padding: 16px 18px; box-shadow: 0 4px 14px rgb(24 34 56 / .04); }
.mr-card--wide { grid-column: 1 / -1; }
.mr-card-h { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 6px 12px; margin-bottom: 10px; }
.mr-card-h h3 { margin: 0; font-size: 17px; }
.mr-card-b { display: grid; gap: 14px; }
.mr-card--wide.mr-card--fig .mr-card-b { grid-template-columns: minmax(0, 1fr) minmax(240px, 360px); align-items: start; gap: 24px; }
.mr-card-text { display: grid; gap: 10px; min-width: 0; }

.mr-formulas { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 32px; padding: 10px 14px; background: var(--dc-soft); border-radius: 10px; }
.mr-formulas p { margin: 0; }
.mr-eq { font-family: var(--mr-math); font-size: 19px; line-height: 1.7; overflow-wrap: anywhere; }
.mr-eq var, .mr-syms dt, .mr-solids var { font-family: var(--mr-math); font-style: italic; }
.mr-frac { display: inline-flex; flex-direction: column; vertical-align: middle; text-align: center; font-size: .86em; line-height: 1.25; margin: 0 .12em; white-space: nowrap; }
.mr-num { border-bottom: 1px solid currentColor; padding: 0 .2em .05em; }
.mr-den { padding: .05em .2em 0; }
.mr-rad { border-top: 1px solid currentColor; padding: .05em .1em 0; }
.mr-sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.mr-syms { margin: 0; display: grid; grid-template-columns: fit-content(45%) minmax(0, 1fr); gap: 4px 12px; font-size: 14px; }
.mr-syms div { display: contents; }
.mr-syms dt { font-weight: 600; color: var(--dc); }
.mr-syms dd { margin: 0; }
.mr-when, .mr-cue { margin: 0; font-size: 14px; }
.mr-when b, .mr-cue b { display: inline-block; margin-right: 6px; font-size: 11.5px; letter-spacing: .05em; text-transform: uppercase; color: var(--mr-muted); }
.mr-cue { padding-top: 8px; border-top: 1px dashed var(--mr-rule); }

.mr-fig { margin: 0; display: grid; gap: 6px; justify-items: center; }
.mr-fig .mr-svg { max-width: 360px; }
.mr-fig figcaption { font-size: 13px; color: var(--mr-muted); text-align: center; max-width: 42ch; }
.mr-svg { display: block; width: 100%; height: auto; color: var(--mr-ink); overflow: visible; }
.mr-svg text { fill: currentColor; }
.mr-svg .mr-l { font: italic 16px var(--mr-math); }
.mr-svg .mr-s { font: 12px Inter, system-ui, sans-serif; }
.mr-svg .mr-hi { fill: var(--mr-hi); font-weight: 700; }

.mr-solids { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 12px; }
.mr-solids figure { margin: 0; height: 100%; display: grid; gap: 4px; justify-items: center; align-content: start; padding: 10px 6px; background: var(--dc-soft); border-radius: 10px; }
.mr-solids .mr-svg { max-width: 120px; }
.mr-solids figcaption { display: grid; gap: 2px; text-align: center; font-size: 13px; }
.mr-solids .mr-eq { font-size: 18px; }

@media (max-width: 1080px) {
  .mr-layout { grid-template-columns: 1fr; }
  .mr-toc { position: static; padding: 10px; }
  .mr-toc-h { display: none; }
  .mr-toc ol { display: flex; flex-wrap: wrap; gap: 8px; }
  .mr-toc a { border: 1px solid var(--mr-rule); border-radius: 999px; padding: 6px 12px; }
  .mr-solids { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 760px) {
  .mr-page { padding: 16px 16px 40px; }
  .mr-hero { grid-template-columns: 1fr; padding: 20px; }
  .mr-hero h1 { font-size: 28px; }
  .mr-grid { grid-template-columns: 1fr; }
  .mr-card { padding: 14px; }
  .mr-card--wide.mr-card--fig .mr-card-b { grid-template-columns: 1fr; }
  .mr-solids { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .mr-eq { font-size: 18px; }
  .mr-actions .mr-btn { flex: 1 1 auto; }
}
@media (prefers-reduced-motion: reduce) { .mr-page * { scroll-behavior: auto !important; } }

/* Print: only the sheet. Compact two-column cards that never split across a page. */
@media print {
  @page { size: letter; margin: 11mm 11mm 12mm; }
  body:has(.mr-page) { background: #fff; }
  body:has(.mr-page) :is(.portal-header, .portal-footer, .portal-skip, .local-test-banner, #toast-container) { display: none !important; }
  .mr-page { max-width: none; padding: 0; font-size: 8.6pt; line-height: 1.35; color: #000; --mr-ink: #000; --mr-muted: #333; }
  .mr-page * { box-shadow: none !important; print-color-adjust: exact; -webkit-print-color-adjust: exact; }
  .mr-crumbs, .mr-toc, .mr-actions, .mr-lede, .mr-session, .mr-session-status { display: none; }
  .mr-hero { display: flex; align-items: center; justify-content: space-between; gap: 12pt; padding: 0 0 5pt; margin-bottom: 7pt; background: none; color: #000; border-radius: 0; border-bottom: 1.2pt solid var(--ezp-brand); }
  .mr-eyebrow { display: none; }
  .mr-hero h1 { margin: 0; font-size: 15pt; }
  .mr-layout { display: block; }
  .mr-body { display: block; }
  .mr-domain { margin-bottom: 7pt; }
  .mr-domain-h { margin-bottom: 4pt; break-after: avoid; }
  .mr-dnum { flex-basis: 16pt; height: 16pt; border-radius: 4pt; font-size: 9pt; }
  .mr-domain-h h2 { font-size: 11.5pt; }
  .mr-domain-h p { font-size: 7.5pt; }
  .mr-grid { gap: 5pt; }
  .mr-card { padding: 5pt 7pt; border-radius: 5pt; border-width: .6pt; border-top-width: 1.6pt; break-inside: avoid; }
  .mr-card-h { margin-bottom: 3pt; }
  .mr-card-h h3 { font-size: 9.4pt; }
  .mr-card-b, .mr-card-text { gap: 3pt; }
  .mr-card--wide.mr-card--fig .mr-card-b { grid-template-columns: minmax(0, 1fr) 46mm; gap: 8pt; }
  .mr-card:not(.mr-card--wide).mr-card--fig .mr-card-b { grid-template-columns: minmax(0, 1fr) 34mm; align-items: start; gap: 6pt; }
  .mr-formulas { padding: 3pt 6pt; gap: 1pt 14pt; border-radius: 4pt; }
  .mr-eq { font-size: 10pt; line-height: 1.55; }
  .mr-syms, .mr-when, .mr-cue { font-size: 7.8pt; }
  .mr-syms { gap: 1pt 6pt; }
  .mr-when b, .mr-cue b { font-size: 6.5pt; margin-right: 3pt; }
  .mr-cue { padding-top: 3pt; }
  .mr-fig .mr-svg { max-width: 46mm; }
  .mr-fig figcaption { font-size: 6.8pt; }
  .mr-svg { color: #000; }
  .mr-solids { grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 4pt; }
  .mr-solids figure { padding: 3pt; border-radius: 4pt; }
  .mr-solids .mr-svg { max-width: 24mm; }
  .mr-solids figcaption { font-size: 7pt; }
  .mr-solids .mr-eq { font-size: 9.5pt; }
}