/* Scroll-driven service explainer. Scoped so the rest of PlexiFi remains untouched. */
.building-scroll {
  --bs-color: var(--premium-cyan);
  position: relative;
  background:
    radial-gradient(circle at 18% 30%, rgba(59, 130, 246, .11), transparent 30rem),
    radial-gradient(circle at 82% 72%, rgba(139, 92, 246, .08), transparent 28rem),
    var(--premium-ink);
  color: var(--premium-text);
  border-block: 1px solid var(--premium-line);
  isolation: isolate;
}
.building-scroll *, .building-scroll *::before, .building-scroll *::after { box-sizing: border-box; }
.building-scroll .bs-stage { min-height: 100svh; padding: 5rem max(1.25rem, calc((100% - 80rem) / 2)) 2.5rem; }
.building-scroll .bs-heading { position: relative; margin-bottom: 2rem; }
.building-scroll .kicker { color: var(--premium-cyan); margin: 0 0 1rem; }
.building-scroll h2 { font-size: clamp(1.9rem, 3vw, 3rem); line-height: 1.12; max-width: 24ch; margin: 0; text-wrap: balance; }
.building-scroll h2 span { color: var(--premium-muted); }
.building-scroll .bs-layout { display: grid; gap: 2rem; }
.building-scroll .bs-figure { min-width: 0; margin: 0; }
.building-scroll .bs-viewport { position: relative; aspect-ratio: 4 / 3; background: radial-gradient(ellipse at 50% 46%, rgba(59, 130, 246, .2), rgba(34, 211, 238, .065) 34%, transparent 68%), linear-gradient(180deg, #091426, var(--premium-ink)); border: 1px solid rgba(125, 211, 252, .25); border-radius: var(--premium-radius); overflow: clip; box-shadow: 0 1.5rem 5rem rgba(0, 0, 0, .34), inset 0 1px 0 rgba(255, 255, 255, .055); }
.building-scroll .bs-viewport::before { content: ""; position: absolute; z-index: 0; inset: 0; pointer-events: none; background-image: linear-gradient(rgba(96, 165, 250, .035) 1px, transparent 1px), linear-gradient(90deg, rgba(96, 165, 250, .035) 1px, transparent 1px); background-size: 2.75rem 2.75rem; -webkit-mask-image: radial-gradient(circle at 50% 48%, black, transparent 76%); mask-image: radial-gradient(circle at 50% 48%, black, transparent 76%); }
.building-scroll .bs-viewport::after { content: ""; position: absolute; z-index: 2; inset: 0; border-radius: inherit; pointer-events: none; box-shadow: inset 0 0 0 1px rgba(34, 211, 238, .08), inset 0 -4rem 7rem rgba(2, 6, 23, .2); }
.building-scroll .bs-poster, .building-scroll canvas { display: block; width: 100%; height: 100%; object-fit: contain; }
.building-scroll .bs-poster { position: relative; z-index: 1; }
.building-scroll canvas { position: absolute; z-index: 1; inset: 0; }
.building-scroll figcaption { margin-top: .9rem; color: var(--premium-muted); font-size: .875rem; line-height: 1.6; }
.building-scroll .bs-copy { min-width: 0; }
.building-scroll .bs-intro { font-size: 1rem; color: var(--premium-muted); line-height: 1.6; margin: 0 0 1.5rem; }
.building-scroll .bs-services { list-style: none; padding: 0; margin: 0; }
.building-scroll .bs-service { display: grid; grid-template-columns: 2rem minmax(0, 1fr); gap: .8rem; padding: 1.4rem 0; border-top: 1px solid var(--premium-line); }
.building-scroll .bs-index { font-family: var(--mono); color: var(--premium-cyan); font-size: .875rem; padding-top: .3rem; }
.building-scroll h3 { font-size: clamp(1.35rem, 2.4vw, 1.9rem); line-height: 1.2; margin: 0 0 1rem; text-wrap: balance; }
.building-scroll p { max-width: 62ch; }
.building-scroll .bs-service p, .building-scroll .bs-conclusion p { font-size: 1rem; line-height: 1.65; color: var(--premium-muted); margin: 0 0 1rem; }
.building-scroll .bs-link { display: inline-flex; min-height: 44px; align-items: center; gap: .45rem; color: #93c5fd; font-size: 1rem; font-weight: 700; }
.building-scroll .bs-link:hover { color: var(--premium-cyan); }
.building-scroll .bs-conclusion { border-top: 1px solid var(--premium-line); padding-top: 1.5rem; margin-top: 1.5rem; }
.building-scroll .bs-progress { position: relative; display: none; min-height: 2.65rem; padding-top: .85rem; }
.building-scroll .bs-progress::before { position: absolute; top: 0; right: 0; left: 0; height: 2px; background: var(--premium-line); content: ""; }
.building-scroll .bs-progress-fill { position: absolute; top: 0; right: 0; left: 0; height: 2px; background: linear-gradient(90deg, var(--premium-cyan), var(--premium-blue), #8b5cf6); box-shadow: 0 0 1rem rgba(59,130,246,.42); transform-origin: left; transform: scaleX(0); }
.building-scroll .bs-progress-steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: .75rem; margin: 0; padding: 0; list-style: none; }
.building-scroll .bs-progress-steps li { display: flex; align-items: baseline; gap: .45rem; color: #64748b; font-family: var(--mono); font-size: .67rem; letter-spacing: .08em; text-transform: uppercase; transition: color 240ms ease, transform 240ms ease; }
.building-scroll .bs-progress-steps b { color: #94a3b8; font-size: .7rem; font-weight: 700; }
.building-scroll .bs-progress-steps em { overflow: hidden; font-style: normal; text-overflow: ellipsis; white-space: nowrap; }
.building-scroll[data-active-service="wifi"] [data-step="wifi"],
.building-scroll[data-active-service="cameras"] [data-step="cameras"],
.building-scroll[data-active-service="voip"] [data-step="voip"],
.building-scroll[data-active-service="iptv"] [data-step="iptv"],
.building-scroll[data-active-service="interphone"] [data-step="interphone"] { color: var(--premium-text); transform: translateY(-2px); }
.building-scroll[data-active-service="wifi"] [data-step="wifi"] b,
.building-scroll[data-active-service="cameras"] [data-step="cameras"] b,
.building-scroll[data-active-service="voip"] [data-step="voip"] b,
.building-scroll[data-active-service="iptv"] [data-step="iptv"] b,
.building-scroll[data-active-service="interphone"] [data-step="interphone"] b { color: var(--premium-cyan); }
.building-scroll :focus-visible { outline: 3px solid var(--premium-cyan); outline-offset: 5px; }

@media (min-width: 1024px) {
  .building-scroll:not(.bs-enhanced) .bs-layout { grid-template-columns: minmax(0, 1.15fr) minmax(21rem, .85fr); align-items: start; gap: clamp(2.5rem, 5vw, 5rem); }
  .building-scroll:not(.bs-enhanced) .bs-viewport { position: sticky; top: 6rem; }
}

@media (prefers-reduced-motion: no-preference) {
  .building-scroll.bs-enhanced .bs-stage { height: 100svh; min-height: 0; display: grid; grid-template-rows: auto minmax(0, 1fr) auto; padding-block: max(5rem, 9svh) 1.5rem; }
  .building-scroll.bs-enhanced .bs-heading { margin-bottom: 1rem; }
  .building-scroll.bs-enhanced .bs-heading .kicker { margin-bottom: .5rem; }
  .building-scroll.bs-enhanced h2 { font-size: clamp(1.75rem, 3vw, 2.65rem); }
  .building-scroll.bs-enhanced .bs-layout { grid-template-columns: minmax(0, 1.45fr) minmax(20rem, 1fr); align-items: center; min-height: 0; gap: clamp(2rem, 3vw, 4rem); }
  .building-scroll.bs-enhanced .bs-figure { align-self: stretch; display: grid; grid-template-rows: minmax(0, 1fr) auto; }
  .building-scroll.bs-enhanced .bs-viewport { height: 100%; min-height: 0; aspect-ratio: auto; }
  .building-scroll.bs-enhanced .bs-poster { visibility: hidden; }
  .building-scroll.bs-enhanced .bs-copy { position: relative; display: grid; align-items: center; min-height: 21rem; }
  .building-scroll.bs-enhanced .bs-services { display: contents; }
  /* Visually clipped, never display:none, visibility:hidden or aria-hidden:
     the complete service list remains readable by assistive technology. */
  .building-scroll.bs-enhanced .bs-panel:not(.is-active) { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
  .building-scroll.bs-enhanced .bs-panel.is-active { grid-area: 1 / 1; border: 0; padding: 0; margin: 0; }
  .building-scroll.bs-enhanced .bs-intro.is-active { font-size: clamp(1.25rem, 2vw, 1.65rem); color: var(--premium-text); line-height: 1.5; }
  .building-scroll.bs-enhanced .bs-conclusion.is-active { display: flex; flex-direction: column; align-items: start; gap: 1rem; }
  .building-scroll.bs-enhanced .bs-panel:focus-within { opacity: 1 !important; transform: none !important; }
  .building-scroll.bs-enhanced .bs-progress { display: block; margin-top: 1rem; }
}

@media (max-width: 767px) {
  .building-scroll .bs-stage { padding-top: 4rem; }
  .building-scroll .bs-viewport { border-radius: 1.25rem; }
  .building-scroll .bs-service { padding-block: 1.25rem; }
}

@media (prefers-reduced-motion: reduce) {
  .building-scroll *, .building-scroll *::before, .building-scroll *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation: none !important; }
}

.building-scroll .bs-mobile-summary { display: none; }

/* Real-time hero model. The existing SVG remains the no-WebGL and reduced-motion fallback. */
.hero-webgl {
  --hero-parallax-x: 0px;
  --hero-parallax-y: 0px;
  position: absolute;
  z-index: 1;
  inset: 3.1rem .65rem .65rem;
  overflow: hidden;
  border-radius: calc(var(--premium-radius) - .35rem);
  opacity: 0;
  transform: translate3d(var(--hero-parallax-x), var(--hero-parallax-y), 0) scale(.985);
  transition: opacity 500ms ease, transform 600ms cubic-bezier(.2,.8,.2,1);
  pointer-events: none;
}
.hero-webgl canvas { display: block; width: 100%; height: 100%; }
.hero .hs-art { position: absolute; z-index: 0; top: 3.1rem; left: .65rem; width: calc(100% - 1.3rem); height: calc(100% - 3.75rem); margin: 0; transition: opacity 420ms ease, transform 520ms ease; }
.hero .diagram-label { z-index: 2; }
.hero.hero-3d-ready .hero-webgl { opacity: 1; transform: translate3d(var(--hero-parallax-x), var(--hero-parallax-y), 0) scale(1); }
.hero.hero-3d-ready .hs-art { opacity: 0; transform: scale(.97); }

@media (min-width: 1024px) {
  .hero .hs-visual { position: relative; display: block; width: 100%; height: clamp(24rem, 30vw, 29rem); min-height: 24rem; padding: 0; overflow: hidden; align-self: center; justify-self: end; }
  .hero-webgl { inset: 3.65rem .85rem .85rem; }
  .hero .hs-art { top: 3.65rem; left: .85rem; width: calc(100% - 1.7rem); height: calc(100% - 4.5rem); }
  .hero .diagram-label { position: absolute; top: 1.05rem; right: 1.15rem; bottom: auto; left: 1.15rem; display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin: 0; color: #cbd5e1; font-size: .68rem; line-height: 1; letter-spacing: .09em; writing-mode: horizontal-tb; transform: none; }
  .hero .diagram-label span { color: #cbd5e1; }
  .hero .diagram-label b { display: inline-flex; min-height: 1.75rem; align-items: center; gap: .45rem; padding: .35rem .65rem; border: 1px solid rgba(34,211,238,.22); border-radius: 999px; background: rgba(34,211,238,.07); color: #a5f3fc; font-size: .62rem; letter-spacing: .08em; }
  .hero .diagram-label b::before { width: .38rem; height: .38rem; border-radius: 50%; background: #22d3ee; box-shadow: 0 0 .7rem rgba(34,211,238,.7); content: ""; }
  .hero.hero-3d-ready .hs-visual { border-color: rgba(34,211,238,.28); box-shadow: 0 1.8rem 5rem rgba(0,0,0,.36), inset 0 1px 0 rgba(255,255,255,.07), 0 0 3rem rgba(59,130,246,.08); }

  .building-scroll figcaption { text-align: center; text-wrap: balance; }

  .module-ribbon { min-height: 4.5rem; padding-inline: max(1.5rem, calc((100vw - 80rem) / 2)); }
  html.motion-native .module-ribbon-track,
  .module-ribbon-track { width: min(100%, 80rem); min-width: 0; max-width: 80rem; margin-inline: auto; padding-inline: 0; justify-content: center; flex: 1 1 auto; animation: none; transform: none; will-change: auto; }
  .module-ribbon-track span { text-align: center; white-space: nowrap; }
  .module-ribbon-track span:nth-of-type(n + 6),
  .module-ribbon-track i:nth-of-type(n + 5) { display: none; }

  html.motion-native .trust,
  .trust { width: 100%; max-width: none; padding: 1rem max(1.5rem, calc((100vw - 80rem) / 2)); align-items: stretch; animation: none; transform: none; }
  .trust li { display: flex; min-height: 3.6rem; align-items: center; justify-content: center; gap: .7rem; padding: .75rem 1rem; text-align: center; line-height: 1.4; text-wrap: balance; }
  .trust li::before { position: static; flex: 0 0 auto; }
}
@media (max-width: 1023px) and (prefers-reduced-motion: no-preference) {
  .hero .hero-brand-lockup { margin-bottom: .8rem; gap: .65rem; }
  .hero .hero-brand-title { font-size: clamp(3rem, 14vw, 4.2rem); }
  .hero .hs-visual { order: 2; position: relative; inset: auto; grid-column: auto; grid-row: auto; justify-self: center; align-self: center; width: 100%; max-width: 29rem; height: clamp(13rem, 60vw, 19rem); min-height: 0; margin: .2rem auto 1.1rem; padding-top: 2.3rem; }
  .hero .hs-copy { order: 3; }
  .hero .diagram-label { top: .65rem; right: .85rem; bottom: auto; left: .85rem; display: flex; align-items: center; justify-content: space-between; gap: .75rem; color: #94a3b8; font-size: .56rem; letter-spacing: .08em; white-space: nowrap; writing-mode: horizontal-tb; transform: none; }
  .hero .diagram-label b { color: #67e8f9; }
  .hero .hs-art { top: 2.35rem; left: .45rem; width: calc(100% - .9rem); height: calc(100% - 2.75rem); }
  .hero:not(.hero-3d-ready) .hs-art { transform: none; }
  .hero-webgl { inset: 2.35rem .45rem .4rem; }
  .building-scroll.bs-enhanced .bs-stage { padding: 4.75rem 1rem calc(5.5rem + env(safe-area-inset-bottom, 0px)); }
  .building-scroll.bs-enhanced .bs-heading { margin-bottom: .75rem; }
  .building-scroll.bs-enhanced .bs-heading .kicker { display: none; }
  .building-scroll.bs-enhanced h2 { font-size: 1.15rem; max-width: none; line-height: 1.25; }
  .building-scroll.bs-enhanced .bs-layout { grid-template-columns: minmax(0, 1fr); grid-template-rows: minmax(100px, 1fr) auto; gap: .75rem; }
  .building-scroll.bs-enhanced .bs-figure { min-height: 0; grid-template-rows: minmax(0, 1fr); }
  .building-scroll.bs-enhanced figcaption,
  .building-scroll.bs-enhanced .bs-description { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); }
  /* Keep the explanation attached to the model; retain the panel height for
     longer service names and links as the scrub advances. */
  .building-scroll.bs-enhanced .bs-copy { min-height: 12rem; align-items: start; padding-top: .45rem; }
  .building-scroll.bs-enhanced .bs-service { grid-template-columns: 1.4rem minmax(0, 1fr); gap: .5rem; }
  .building-scroll.bs-enhanced h3 { font-size: 1.25rem; line-height: 1.2; margin-bottom: .5rem; }
  .building-scroll.bs-enhanced .bs-mobile-summary { display: block; font-size: 1rem; line-height: 1.5; margin-bottom: .25rem; }
  .building-scroll.bs-enhanced .bs-intro.is-active { font-size: 1.125rem; }
  .building-scroll.bs-enhanced .bs-conclusion.is-active { gap: .5rem; }
  .building-scroll.bs-enhanced .bs-conclusion p { margin-bottom: 0; }
  .building-scroll.bs-enhanced .bs-progress { margin-top: .5rem; }
  .building-scroll.bs-enhanced .bs-progress-steps { gap: .2rem; }
  .building-scroll.bs-enhanced .bs-progress-steps li { justify-content: center; }
  .building-scroll.bs-enhanced .bs-progress-steps em { position: absolute; width: 1px; height: 1px; margin: -1px; overflow: hidden; clip-path: inset(50%); }
}
@media (prefers-reduced-motion: reduce) {
  .hero-webgl { display: none; }
}

/* On compact phones, keep enough height for a recognizable cutaway while
   retaining the active service and the fixed CTA in their own space. */
@media (max-width: 767px) and (max-height: 640px) and (prefers-reduced-motion: no-preference) {
  .building-scroll.bs-enhanced .bs-copy { min-height: 10rem; }
  .building-scroll.bs-enhanced .bs-progress { min-height: .85rem; padding-top: .5rem; }
  .building-scroll.bs-enhanced .bs-progress-steps { display: none; }
}