.site-header{position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between;padding:18px clamp(20px,5vw,72px);backdrop-filter:blur(22px);background:linear-gradient(180deg,rgba(5,7,17,.82),rgba(5,7,17,.45));border-bottom:1px solid rgba(255,255,255,.08)}.brand{font-weight:950;letter-spacing:-.04em;font-size:1.15rem}.brand span{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:12px;margin-right:8px;background:linear-gradient(135deg,var(--accent),var(--accent2));box-shadow:0 0 26px rgba(0,229,255,.24)}nav{display:flex;align-items:center;gap:8px;flex-wrap:wrap}nav a{padding:10px 13px;border-radius:999px;color:var(--muted);font-weight:700;font-size:.92rem}nav a:hover,nav a.active,.admin-link{background:rgba(255,255,255,.08);color:var(--text)}main{width:100%}.section{width:min(1180px,calc(100% - 36px));margin:0 auto;padding:76px 0}.section.narrow{width:min(880px,calc(100% - 36px))}.section h2{font-size:clamp(2rem,4.5vw,4.2rem);line-height:.96;letter-spacing:-.07em;margin:0 0 24px}.rich-text{font-size:1.08rem;line-height:1.85;color:var(--muted)}.grid{display:grid;gap:18px}.cards-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.site-footer{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;padding:34px clamp(20px,5vw,72px);border-top:1px solid rgba(255,255,255,.08);color:var(--muted);background:rgba(255,255,255,.03)}.subsection-wrap{margin-top:28px;display:grid;gap:14px}.subsection{border:1px solid rgba(255,255,255,.1);border-radius:22px;padding:18px;background:rgba(255,255,255,.045)}.media-section img,.media-section video{border-radius:28px;border:1px solid rgba(255,255,255,.12);box-shadow:0 28px 80px rgba(0,0,0,.24)}.gallery-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.gallery-grid figure{margin:0}.gallery-grid img{aspect-ratio:4/3;object-fit:cover;border-radius:24px}@media(max-width:860px){.site-header{position:relative;align-items:flex-start;flex-direction:column}.cards-grid,.gallery-grid{grid-template-columns:1fr}.section{padding:52px 0}}

/* Sprint 4.1 language switch */
.lang-switch{display:inline-flex;align-items:center;gap:4px;margin-left:10px;padding:4px;border:1px solid rgba(255,255,255,.14);border-radius:999px;background:rgba(255,255,255,.05);backdrop-filter:blur(10px)}
.lang-switch a{padding:6px 9px!important;border-radius:999px;font-size:12px;font-weight:800;letter-spacing:.08em;color:var(--muted)!important;text-decoration:none!important}
.lang-switch a.active{color:#04111d!important;background:linear-gradient(135deg,var(--accent2),var(--accent3));box-shadow:0 0 24px rgba(0,229,255,.28)}
@media (max-width:900px){.lang-switch{width:max-content;margin:8px 0 0}.site-header nav{gap:8px;flex-wrap:wrap}}

/* Sprint 4.11 — responsive polish: compact desktop typography and mobile dropdown navigation */
.mobile-menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:5px;width:42px;height:42px;border:1px solid rgba(255,255,255,.16);border-radius:14px;background:rgba(255,255,255,.075);backdrop-filter:blur(14px);padding:0;box-shadow:inset 0 1px rgba(255,255,255,.12)}
.mobile-menu-toggle span{display:block;width:18px;height:2px;border-radius:999px;background:var(--text);transition:transform .24s ease,opacity .24s ease}
.mobile-menu-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.mobile-menu-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.mobile-menu-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
@media (min-width:901px){
  .site-header{padding-top:14px;padding-bottom:14px}
  .section h2{font-size:clamp(1.9rem,3.4vw,3.45rem);line-height:1.02}
  .rich-text{font-size:1.02rem;line-height:1.72}
}
@media (max-width:900px){
  .site-header{position:sticky;top:0;flex-direction:row;align-items:center;padding:12px 16px;min-height:66px;background:linear-gradient(180deg,rgba(5,7,17,.94),rgba(5,7,17,.78));}
  .brand{font-size:.98rem;max-width:calc(100% - 56px);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .brand span{width:30px;height:30px;border-radius:10px}
  .mobile-menu-toggle{display:flex;margin-left:auto;position:relative;z-index:21}
  .primary-nav{position:absolute;top:calc(100% + 8px);left:12px;right:12px;display:grid;grid-template-columns:1fr;gap:6px;padding:12px;border:1px solid rgba(255,255,255,.14);border-radius:22px;background:rgba(7,10,23,.96);box-shadow:0 24px 70px rgba(0,0,0,.38);backdrop-filter:blur(24px);opacity:0;visibility:hidden;transform:translateY(-8px) scale(.98);pointer-events:none;transition:opacity .22s ease,transform .22s ease,visibility .22s ease;max-height:min(68vh,520px);overflow:auto}
  .site-header.nav-open .primary-nav{opacity:1;visibility:visible;transform:none;pointer-events:auto}
  .primary-nav a{display:block;width:100%;padding:11px 13px;border-radius:14px;font-size:.92rem;background:rgba(255,255,255,.035)}
  .primary-nav .lang-switch{margin:4px 0 0;width:100%;justify-content:center;border-radius:16px}
  .primary-nav .lang-switch a{width:50%;text-align:center;background:transparent}
  .section{width:min(100% - 28px,1180px);padding:46px 0}.section.narrow{width:min(100% - 28px,880px)}
  .section h2{font-size:clamp(1.75rem,9vw,2.85rem);line-height:1.05;letter-spacing:-.055em}
  .rich-text{font-size:1rem;line-height:1.68}
}

/* Sprint 4.18 — Content First UX for collection pages */
.content-first-section,
.publications-section.content-first-section,
.books-section.content-first-section,
.ip-section.content-first-section,
.video-gallery-section.content-first-section,
.collection-section.content-first-section {
  padding-top: clamp(5.5rem, 8vw, 7.5rem);
}

.collection-compact-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 1.25rem;
  margin-bottom: 1.15rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid rgba(255,255,255,.12);
}

.collection-compact-header .eyebrow {
  margin-bottom: .45rem;
}

.collection-compact-header h1 {
  margin: 0;
  font-size: clamp(2rem, 4.5vw, 4.2rem);
  line-height: .95;
  letter-spacing: -0.055em;
}

.collection-compact-count {
  min-width: 150px;
  padding: .85rem 1rem;
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 22px;
  background: linear-gradient(135deg, rgba(255,255,255,.10), rgba(255,255,255,.035));
  box-shadow: 0 18px 50px rgba(0,0,0,.20);
  text-align: right;
}

.collection-compact-count strong {
  display: block;
  font-size: clamp(1.55rem, 3vw, 2.25rem);
  line-height: 1;
}

.collection-compact-count span {
  display: block;
  margin-top: .25rem;
  font-size: .78rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .12em;
}

.content-first-section .pub-filters,
.content-first-section .book-filters,
.content-first-section .ip-filters {
  margin-top: .6rem;
  margin-bottom: .75rem;
  padding: .8rem;
  border-radius: 24px;
  background: rgba(255,255,255,.055);
  border: 1px solid rgba(255,255,255,.10);
  backdrop-filter: blur(16px);
}

.content-first-section .publication-list,
.content-first-section .book-list,
.content-first-section .ip-list,
.content-first-section .video-grid {
  margin-top: 1rem;
}

.content-first-section .publication-card,
.content-first-section .book-card,
.content-first-section .ip-card,
.content-first-section .video-card {
  padding-top: 1.05rem;
  padding-bottom: 1.05rem;
}

.content-first-section .pub-filter-status,
.content-first-section .book-filter-status,
.content-first-section .ip-filter-status {
  margin: .15rem 0 1rem;
  opacity: .8;
}

@media (max-width: 768px) {
  .content-first-section,
  .publications-section.content-first-section,
  .books-section.content-first-section,
  .ip-section.content-first-section,
  .video-gallery-section.content-first-section,
  .collection-section.content-first-section {
    padding-top: 5.25rem;
  }

  .collection-compact-header {
    grid-template-columns: 1fr;
    align-items: start;
    gap: .85rem;
  }

  .collection-compact-header h1 {
    font-size: clamp(1.9rem, 11vw, 3rem);
  }

  .collection-compact-count {
    width: 100%;
    min-width: 0;
    text-align: left;
    display: flex;
    align-items: baseline;
    gap: .7rem;
    flex-wrap: wrap;
  }

  .collection-compact-count strong,
  .collection-compact-count span {
    display: inline-block;
    margin: 0;
  }

  .content-first-section .pub-filters,
  .content-first-section .book-filters,
  .content-first-section .ip-filters {
    display: grid;
    grid-template-columns: 1fr;
    gap: .65rem;
    padding: .75rem;
    border-radius: 20px;
  }
}