/* Site-wide frame */
:root {
  --site-frame-width: 71.25rem;
  --site-gutter: 3rem;
  --site-gutter-narrow: 2.5rem;
  --navigation-rail-width: 10.75rem;
  --site-column-gap: 2.5rem;
  --structured-content-padding: 2.75rem;
  --structured-content-padding-tablet: 1.5rem;
  --heading-1-size: 2rem;
  --heading-2-size: 1.5rem;
  --heading-3-size: 1.25rem;
}

html,
body {
  margin: 0;
  background: var(--site-outer);
}

.site-shell {
  width: min(1180px, calc(100% - 48px));
  margin-left: auto;
  margin-right: auto;
}

.site-frame-shell,
.site-frame {
  width: min(var(--site-frame-width), calc(100% - var(--site-gutter)));
  margin-left: auto;
  margin-right: auto;
}

.site-frame {
  display: grid;
  grid-template-columns: var(--navigation-rail-width) minmax(0, 1fr);
  gap: var(--site-column-gap);
  background: var(--site-surface);
}

.site-header {
  border-bottom: 0;
  background: var(--site-outer);
}

.site-header::after {
  display: block;
  width: min(var(--site-frame-width), calc(100% - var(--site-gutter)));
  height: 2px;
  margin: 0 auto;
  background: var(--editorial-blue);
  content: "";
}

.site-header-inner {
  position: relative;
  padding-top: 1.625rem;
  padding-bottom: 1.625rem;
  background: var(--site-surface);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  column-gap: var(--site-column-gap);
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: .85rem;
  color: var(--site-text) !important;
  text-decoration: none !important;
}

.site-brand-mark {
  width: 58px;
  height: 58px;
  object-fit: contain;
}

.site-brand-text {
  display: flex;
  flex-direction: column;
}

.site-brand-text strong {
  color: var(--editorial-blue);
  font-size: 1.9rem;
  line-height: 1.05;
  letter-spacing: -.025em;
}

.site-brand-text span {
  margin-top: .18rem;
  color: var(--editorial-muted);
  font-size: .9rem;
  line-height: 1.3;
}

.site-core-identity img {
  display: block;
  width: 205px;
  max-height: 58px;
  object-fit: contain;
}

.site-mobile-menu {
  display: none;
}

.site-nav-rail {
  position: relative;
  padding-top: 2.6rem;
  background: var(--site-rail);
  border-right: 1px solid var(--site-rail-rule);
}

.site-nav-rail .site-navigation {
  z-index: 1;
  position: sticky;
  top: 2.25rem;
  padding-left: .875rem;
  padding-top: .2rem;
}

.site-navigation ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-navigation li,
.site-navigation li + li {
  margin: 0;
}

.site-nav-rail .site-navigation li + li {
  margin-top: .85rem;
}

.site-navigation a {
  display: block;
  color: var(--site-navigation-text);
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  line-height: 1.3;
}

.site-navigation a:hover {
  color: var(--editorial-blue);
  text-decoration: none;
}

.site-navigation a.is-current {
  color: var(--editorial-blue);
  font-weight: 700;
}

.site-nav-rail .site-navigation a.is-current {
  margin-left: -.75rem;
  padding-left: .55rem;
  border-left: .2rem solid var(--editorial-blue);
}

.site-nav-rail .site-navigation a {
  font-size: 1.125rem;
}

.site-main {
  padding-top: 2.6rem;
  padding-bottom: 5rem;
}

.site-main.markdown-body {
  max-width: none;
  box-sizing: border-box;
  font-size: 1.125rem;
  line-height: 1.6;
}

.site-main.markdown-body h1 { font-size: var(--heading-1-size); }
.site-main.markdown-body h2 { font-size: var(--heading-2-size); }
.site-main.markdown-body h3 { font-size: var(--heading-3-size); }

.site-main.markdown-body > h1:first-child {
  margin-top: 0;
}

.site-footer {
  border-top: 1px solid var(--content-rule);
  background: var(--site-footer);
  color: var(--editorial-muted);
}

.site-footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(10rem, .8fr) minmax(12rem, 1fr);
  gap: 3rem;
  padding-top: 2.6rem;
  padding-bottom: 3rem;
}

.site-footer strong {
  display: block;
  margin-bottom: .65rem;
  color: var(--site-text);
}

.site-footer-identity > strong {
  color: var(--editorial-blue);
  font-size: 1.45rem;
  letter-spacing: -.02em;
}

.site-footer p {
  max-width: 31rem;
  margin: .35rem 0;
  line-height: 1.5;
}

.site-footer-links {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: .45rem;
}

.site-footer a {
  color: var(--editorial-link);
}

@media (min-width: 1280px) {
  /* The desktop rail-to-content gap establishes the left content inset; mirror it on generic pages. */
  .site-main {
    padding-right: var(--site-column-gap);
  }

  /* Structured landing pages share the same frame-to-content inset. */
  .site-frame-research,
  .site-frame-education,
  .site-frame-programmes-projects,
  .site-frame-network-partnerships {
    column-gap: 0;
  }

  .research-page,
  .education-main,
  .programmes-projects-main,
  .network-partnerships-page {
    padding-right: var(--structured-content-padding);
    padding-left: var(--structured-content-padding);
  }

  .site-footer .site-shell {
    width: min(var(--site-frame-width), calc(100% - var(--site-gutter)));
  }
}

@media (min-width: 861px) and (max-width: 1279px) {
  .research-page,
  .education-main,
  .programmes-projects-main,
  .network-partnerships-page {
    padding-right: var(--structured-content-padding-tablet);
    padding-left: var(--structured-content-padding-tablet);
  }
}

/* Site-wide responsive directories */
@media (min-width: 768px) {
  .member-columns {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 2rem;
  }
}

@media (max-width: 1279px) {
  html,
  body,
  .site-header { background: var(--site-surface); }

  .site-header::after { display: none; }

  .site-frame-shell,
  .site-frame {
    width: min(1180px, calc(100% - var(--site-gutter)));
  }

  .site-frame {
    display: block;
  }

  .site-header-inner {
    grid-template-columns: minmax(0, 1fr) auto auto;
    padding-top: 1.5rem;
    padding-bottom: 1.5rem;
  }

  .site-nav-rail {
    display: none;
  }

  .site-mobile-menu {
    display: block;
    position: static;
    margin-left: 1.5rem;
  }

  .site-mobile-menu {
    padding: 0;
    border: 0;
    background: transparent;
    color: var(--editorial-link);
    font: inherit;
    font-weight: 600;
    cursor: pointer;
  }

  .site-mobile-navigation {
    position: absolute;
    z-index: 10;
    top: 100%;
    right: 0;
    left: 0;
    padding: 1rem 0 1.15rem;
    border-top: 1px solid var(--content-rule);
    border-bottom: 1px solid var(--content-rule);
    background: var(--site-surface);
  }

  .site-mobile-navigation .site-navigation ul {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: .65rem 1.5rem;
  }

  .site-mobile-navigation .site-navigation a {
    font-size: .95rem;
  }
}

@media (min-width: 768px) and (max-width: 900px) {
  .site-header-inner {
    column-gap: 1.25rem;
  }

  .site-core-identity img {
    width: 185px;
    max-height: 52px;
  }
}

@media (max-width: 767px) {
  .site-brand-mark { width:50px; height:50px; }
  .site-core-identity { display:none; }
  .site-brand-text strong { font-size:1.4rem; }
  .site-brand-text span { font-size:.7rem; max-width:18rem; }
  .site-mobile-menu { margin-left:1rem; }
  .site-mobile-navigation .site-navigation ul { grid-template-columns:1fr; gap:.55rem; }
  .site-footer-grid { grid-template-columns:1fr; gap:1.6rem; }
}

@media (max-width: 360px) {
  .site-shell,
  .site-frame-shell,
  .site-frame { width: min(100% - var(--site-gutter-narrow), 1180px); }
}