.research-004-page .r1-hero { padding-bottom: 32px; }
.r4-title-note { max-width: 780px; margin: 14px 0 0; color: #c7d0d5; font-size: 14px; line-height: 1.8; }
.r4-en { margin: -12px 0 21px; color: var(--copper); font: 600 13px/1.4 sans-serif; letter-spacing: .08em; text-transform: uppercase; }
.r4-expansion > ol { list-style: none; margin: 28px 0 0; padding: 0; border-top: 1px solid var(--line); }
.r4-expansion > ol > li { display: grid; grid-template-columns: 94px minmax(0,1fr); gap: 22px; padding: 27px 0; border-bottom: 1px solid var(--line); scroll-margin-top: 24px; }
.r4-map-head { display: flex; flex-direction: column; align-items: flex-start; gap: 6px; }
.r4-map-head span { color: var(--copper); font: 31px/1.15 Georgia,serif; }
.r4-map-head time { color: var(--burgundy); font-size: 14px; font-weight: 700; direction: ltr; }
.r4-map-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 22px 30px; }
.r4-map-grid > div { min-width: 0; }
.r4-map-grid b { display: block; margin-bottom: 7px; color: var(--muted); font-size: 12px; font-weight: 700; }
.r4-map-grid p { margin: 0; color: #263d4c; font-size: 15px; line-height: 1.85; }
.r4-link-list { display: grid; gap: 5px; }
.r4-link-list a { width: fit-content; color: var(--burgundy); font-size: 14px; line-height: 1.65; text-decoration: underline; text-decoration-color: #c9a88b; text-underline-offset: 4px; }
.r4-matrix-head, .r4-matrix-row { display: grid; grid-template-columns: 1.25fr 1.15fr .8fr; }
.r4-matrix-head { margin-top: 27px; background: var(--navy); color: #fff; }
.r4-matrix-head span { padding: 12px 17px; border-inline-end: 1px solid #456070; font-size: 13px; font-weight: 700; }
.r4-matrix-head span:last-child { border: 0; }
.r4-matrix-body { border-inline: 1px solid var(--line); }
.r4-matrix-row > div { min-width: 0; display: grid; align-content: center; gap: 6px; padding: 16px 17px; border-inline-end: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.r4-matrix-row > div:last-child { border-inline-end: 0; }
.r4-matrix-row a { width: fit-content; color: var(--burgundy); font-size: 13px; line-height: 1.55; text-decoration: underline; text-underline-offset: 3px; }
.r4-matrix-row strong { color: var(--navy); font-size: 14px; line-height: 1.7; }
.r4-perspective-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); border-block: 1px solid var(--line); }
.r4-perspective-grid > div { min-width: 0; padding: 27px 25px 30px; }
.r4-perspective-grid > div:first-child { padding-inline-start: 0; border-inline-end: 1px solid var(--line); }
.r4-perspective-grid h2 { font-size: clamp(21px,2vw,27px); }
.r4-perspective-grid ul { margin: 0; padding: 0 20px 0 0; }
.r4-perspective-grid li { margin-bottom: 15px; font-size: 16px; line-height: 1.9; }
.r4-reading { background: #f0e9df; }
.r4-reading h2 { color: var(--burgundy); }
.r4-topics > div { display: flex; flex-wrap: wrap; gap: 10px; align-items: stretch; }
.r4-main-topic { display: grid; gap: 3px; min-width: 245px; padding: 15px 18px; background: var(--navy); color: #fff; border-inline-start: 3px solid var(--copper); }
.r4-main-topic span { color: #bdcbd2; font-size: 12px; }
.r4-main-topic strong { font: 700 16px/1.6 'Noto Kufi Arabic',sans-serif; }
.r4-secondary-topic { display: inline-flex; align-items: center; padding: 12px 15px; border: 1px solid var(--line); background: var(--paper); color: var(--navy); font-size: 14px; font-weight: 600; }
.r4-study-toc { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 0 28px; margin: 27px 0; border-block: 1px solid var(--line); }
.r4-study-toc a { display: flex; justify-content: space-between; gap: 18px; padding: 10px 0; border-bottom: 1px solid var(--line); color: var(--navy); font-size: 14px; line-height: 1.6; }
.r4-study-toc a:hover { color: var(--burgundy); text-decoration: underline; }
.r4-study-toc b { flex: 0 0 auto; color: var(--burgundy); font-size: 12px; }
.r4-source-links { display: flex; flex-wrap: wrap; gap: 10px 24px; margin: 24px 0; }
.r4-source-links a { color: var(--burgundy); font-size: 15px; font-weight: 700; text-decoration: underline; text-underline-offset: 4px; }
.r4-pdf { display: block; width: min(100%,780px); height: 760px; border: 1px solid var(--line); background: var(--paper); }
.r4-pdf p { margin: 20px; }
.r4-source-review { max-width: 780px; margin-top: 25px; padding: 20px 22px; border: 1px solid #c8a977; background: #f7efe1; }
.r4-source-review h3 { margin: 0 0 9px; color: var(--burgundy); font: 700 16px/1.7 'Noto Kufi Arabic',sans-serif; }
.r4-source-review ul { margin: 0; padding: 0 19px 0 0; }
.r4-source-review li { margin-top: 8px; color: #4e4338; font-size: 14px; line-height: 1.8; }
@media (max-width: 900px) {
  .r4-map-grid { grid-template-columns: 1fr; gap: 15px; }
}
@media (max-width: 700px) {
  .r4-title-note { font-size: 13px; }
  .r4-expansion > ol > li { grid-template-columns: 1fr; gap: 13px; padding: 23px 0; }
  .r4-map-head { flex-direction: row; align-items: baseline; }
  .r4-map-head span { font-size: 26px; }
  .r4-matrix-head { display: none; }
  .r4-matrix-body { border: 0; }
  .r4-matrix-row { display: grid; grid-template-columns: 1fr; margin-bottom: 17px; border: 1px solid var(--line); background: var(--paper); }
  .r4-matrix-row > div { padding: 13px 15px; border-inline-end: 0; }
  .r4-matrix-row > div::before { content: attr(data-label); display: block; margin-bottom: 7px; color: var(--muted); font-size: 12px; font-weight: 700; }
  .r4-perspective-grid { grid-template-columns: 1fr; }
  .r4-perspective-grid > div { padding: 22px 0; }
  .r4-perspective-grid > div:first-child { border-inline-end: 0; border-bottom: 1px solid var(--line); }
  .r4-perspective-grid > .r4-reading { padding-inline: 18px; }
  .r4-main-topic { width: 100%; min-width: 0; }
  .r4-secondary-topic { flex: 1 1 calc(50% - 10px); }
  .r4-study-toc { grid-template-columns: 1fr; }
  .r4-pdf { display: none; }
}