.structures-page .structures-shell{
  width:min(1680px,calc(100% - 32px));
  margin:0 auto;
  padding:64px 0 90px;
}

.structures-hero{
  display:flex;
  flex-direction:column;
  align-items:center;
  text-align:center;
  gap:22px;
  margin-bottom:26px;
}

.structures-title-img{
  width:min(760px,92vw);
  filter:drop-shadow(0 22px 28px rgba(0,0,0,.68));
}

.structures-controls{
  width:min(1500px,100%);
  display:flex;
  align-items:center;
  justify-content:center;
  flex-wrap:wrap;
  gap:12px;
  margin:0 auto;
}

.structure-search-wrap{
  position:relative;
  flex:0 1 430px;
  width:min(430px,100%);
}

.structure-search-wrap input{
  width:100%;
  height:48px;
  border-radius:18px;
  border:1px solid rgba(255,255,255,.16);
  background:rgba(6,8,16,.58);
  box-shadow:0 10px 24px rgba(0,0,0,.2),inset 0 1px 0 rgba(255,255,255,.1);
  backdrop-filter:blur(10px);
  color:#fff;
  font:900 14px Montserrat,Arial,sans-serif;
  padding:0 50px 0 18px;
  outline:none;
}

.structure-search-wrap input::placeholder{
  color:rgba(255,255,255,.58);
}

.structure-search-wrap button{
  position:absolute;
  right:7px;
  top:7px;
  width:34px;
  height:34px;
  border-radius:999px;
  border:0;
  background:rgba(255,255,255,.12);
  color:#fff;
  font-size:22px;
  font-weight:900;
  cursor:pointer;
}

.structure-quick-filters{
  display:flex;
  align-items:center;
  justify-content:center;
  flex-wrap:wrap;
  gap:8px;
  max-width:min(980px,100%);
}

.structure-quick-filters .filter-chip{
  display:inline-flex;
  align-items:center;
  gap:8px;
  border:1px solid rgba(255,255,255,.14);
  border-radius:999px;
  background:rgba(6,8,16,.56);
  color:rgba(255,255,255,.9);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.08),0 10px 22px rgba(0,0,0,.2);
  backdrop-filter:blur(10px);
  padding:8px 12px;
  font-weight:900;
  cursor:pointer;
  text-transform:capitalize;
}

.structure-quick-filters .filter-chip:hover,
.structure-quick-filters .filter-chip.is-active{
  color:#fff;
  border-color:rgba(255,255,255,.28);
  background:rgba(255,255,255,.11);
}

.structure-quick-filters .filter-chip.is-empty{
  opacity:.45;
  cursor:not-allowed;
}

.structure-quick-filters .filter-chip strong{
  min-width:24px;
  padding:2px 7px;
  border-radius:999px;
  background:rgba(255,255,255,.14);
  color:#fff;
  font-size:11px;
  line-height:1.4;
  text-align:center;
}

.structure-section{
  margin:52px 0 0;
}

.structure-section[hidden],
.structure-card[hidden]{
  display:none!important;
}

.structure-section h2{
  position:relative;
  display:flex;
  align-items:center;
  gap:16px;
  width:100%;
  margin:0 0 20px;
  padding:0;
  color:#fff;
  font-size:clamp(22px,2.4vw,38px);
  font-weight:900;
  line-height:1.05;
  letter-spacing:.01em;
  text-transform:capitalize;
  text-shadow:0 4px 22px rgba(0,0,0,.68);
}

.structure-section h2::before{
  content:"";
  width:13px;
  height:13px;
  flex:0 0 auto;
  border-radius:4px;
  transform:rotate(45deg);
  background:linear-gradient(135deg,var(--accent-2),var(--accent));
  box-shadow:0 0 18px color-mix(in srgb,var(--accent) 52%,transparent),inset 0 1px 0 rgba(255,255,255,.42);
}

.structure-section h2::after{
  content:"";
  height:1px;
  flex:1 1 auto;
  min-width:60px;
  background:linear-gradient(90deg,color-mix(in srgb,var(--accent) 46%,rgba(255,255,255,.18)),rgba(255,255,255,.12) 38%,rgba(255,255,255,0));
  box-shadow:0 0 18px color-mix(in srgb,var(--accent) 18%,transparent);
}

.structures-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(250px,1fr));
  gap:18px;
}

.structure-card{
  position:relative;
  min-height:260px;
  overflow:hidden;
  border-radius:28px;
  border:1px solid rgba(255,255,255,.12);
  background:linear-gradient(135deg,var(--card-a),var(--card-b)),var(--glass);
  box-shadow:0 18px 44px rgba(0,0,0,.38),inset 0 1px 0 rgba(255,255,255,.09);
  backdrop-filter:blur(14px) saturate(1.08);
  transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease;
}

.structure-card:hover{
  transform:translateY(-4px);
  border-color:rgba(255,255,255,.25);
  box-shadow:0 24px 62px rgba(0,0,0,.48),0 0 32px color-mix(in srgb,var(--accent) 16%,transparent),inset 0 1px 0 rgba(255,255,255,.14);
}

.structure-card-link{
  position:absolute;
  inset:0;
  z-index:2;
}

.structure-preview-stack{
  height:174px;
  position:relative;
  background:radial-gradient(circle at 50% 18%,rgba(255,255,255,.08),transparent 45%),rgba(0,0,0,.18);
  overflow:hidden;
}

.structure-preview-stack img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:contain;
  padding:10px;
  opacity:0;
  animation:structure-preview-rotate calc(var(--slide-count,4) * var(--slide-duration,8.75s)) linear infinite;
  animation-delay:calc((var(--slide-index,0) * var(--slide-duration,8.75s)) - var(--slide-offset,0s));
  will-change:opacity;
}

@keyframes structure-preview-rotate{
  0%{opacity:1}
  21%{opacity:1}
  27%{opacity:0}
  94%{opacity:0}
  100%{opacity:1}
}

.structure-info{
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:4px;
  padding:14px 16px 16px;
}

.structure-name{
  font-size:18px;
  font-weight:900;
  margin:0;
  text-align:left;
}

.structure-id{
  display:block;
  width:100%;
  max-width:100%;
  margin:0;
  padding:0;
  border:0;
  border-radius:0;
  background:transparent;
  box-shadow:none;
  color:var(--accent);
  font-size:12px;
  font-weight:850;
  line-height:1.25;
  text-align:left;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
  cursor:pointer;
}

.structure-id:hover{
  text-decoration:underline;
}

.structures-empty{
  width:min(900px,100%);
  margin:20px auto 0;
  padding:34px;
  border:1px solid rgba(255,255,255,.14);
  border-radius:28px;
  background:linear-gradient(135deg,var(--card-a),var(--card-b)),var(--glass);
  box-shadow:0 18px 44px rgba(0,0,0,.38),inset 0 1px 0 rgba(255,255,255,.09);
  text-align:center;
  font-weight:900;
  color:var(--muted);
}

@media(max-width:980px){
  .structures-controls{
    flex-direction:column;
  }

  .structure-search-wrap{
    width:min(560px,100%);
    flex:0 1 auto;
  }

  .structure-quick-filters{
    width:100%;
  }
}

@media(max-width:640px){
  .structures-page .structures-shell{
    width:min(100% - 18px,1680px);
    padding-top:36px;
  }

  .structures-grid{
    grid-template-columns:1fr;
  }

  .structures-title-img{
    width:min(620px,100%);
  }
}


/* v27 sticky footer layout: footer rests at viewport bottom on short pages */
html{
  min-height:100%;
}

body{
  min-height:100vh;
  display:flex;
  flex-direction:column;
}

body > main,
body > .hero,
body > .page-shell,
body > .structures-shell{
  flex:1 0 auto;
}

.site-footer{
  flex-shrink:0;
  margin-top:auto !important;
}