/* ============================================================================
   ENVIROTEC — Chamber Carousel  (light HUD; matches site white + green theme)
   Uses site CSS variables, so it adapts to the site's light/dark mode too.
   Coverflow deck (front + one each side; far cards fade + blur into background)
   with a technical spec panel on the right.
   ============================================================================ */

.hud-helix {
  position: relative; overflow: hidden; isolation: isolate;
  height: 100vh; height: 100dvh; min-height: 640px;
  background: radial-gradient(130% 100% at 34% 52%, var(--off-white) 0%, var(--white) 62%);
  color: var(--text-body); font-family: var(--font-sans);
}
.hud-helix::before {                          /* faint engineering grid */
  content: ""; position: absolute; inset: 0; z-index: 0; pointer-events: none; opacity: .6;
  background-image:
    linear-gradient(rgba(11,122,62,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(11,122,62,.05) 1px, transparent 1px);
  background-size: 62px 62px;
  -webkit-mask-image: radial-gradient(78% 76% at 38% 50%, #000, transparent 82%);
          mask-image: radial-gradient(78% 76% at 38% 50%, #000, transparent 82%);
}

/* corner brackets */
.hud-corner { position: absolute; width: 26px; height: 26px; z-index: 5; border: 1.5px solid rgba(11,122,62,.4); pointer-events: none; }
.hud-corner.tl { top: 16px; left: 16px; border-right: 0; border-bottom: 0; }
.hud-corner.tr { top: 16px; right: 16px; border-left: 0; border-bottom: 0; }
.hud-corner.bl { bottom: 16px; left: 16px; border-right: 0; border-top: 0; }
.hud-corner.br { bottom: 16px; right: 16px; border-left: 0; border-top: 0; }

/* top bar */
.hud-top {
  position: absolute; top: clamp(86px, 11vh, 108px); left: 0; right: 0; z-index: 4;
  display: flex; justify-content: space-between; align-items: center;
  padding: 0 clamp(30px, 4vw, 68px);
  font-family: var(--font-mono); font-size: .72rem; letter-spacing: .2em; text-transform: uppercase;
}
.hud-live { display: inline-flex; align-items: center; gap: 12px; color: var(--text-muted); }
.hud-live b { color: var(--green); font-weight: 500; }
.hud-live .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--green); box-shadow: 0 0 10px rgba(11,122,62,.45); animation: hudBlink 2.2s ease-in-out infinite; }
@keyframes hudBlink { 0%,100% { opacity: 1; } 50% { opacity: .3; } }
.hud-axis { color: var(--text-faint); }

/* stage */
.hud-main { position: absolute; inset: 0; z-index: 1; }
.helix-stage {
  position: absolute; inset: 0; overflow: hidden;
  perspective: 1900px; perspective-origin: 37% 50%;
  cursor: grab; touch-action: pan-y; user-select: none;
  -webkit-mask-image: linear-gradient(180deg, transparent 0, #000 15%, #000 85%, transparent 100%);
          mask-image: linear-gradient(180deg, transparent 0, #000 15%, #000 85%, transparent 100%);
}
.helix-stage:active { cursor: grabbing; }
.helix-axis {
  position: absolute; left: 37%; top: 12%; bottom: 12%; width: 1px; z-index: 0; transform: translateX(-50%);
  background: linear-gradient(180deg, transparent, rgba(11,122,62,.26), transparent);
}
.helix { position: absolute; top: 50%; left: 37%; width: 0; height: 0; transform-style: preserve-3d; will-change: transform; }

/* cards */
.helix-card {
  position: absolute; top: 0; left: 0; width: 352px; height: 452px; margin: -226px 0 0 -176px;
  border-radius: 14px; overflow: hidden; text-decoration: none;
  background: var(--white); border: 1px solid var(--border); box-shadow: var(--shadow-lg);
  display: flex; flex-direction: column; will-change: opacity, transform, filter;
  backface-visibility: hidden; -webkit-backface-visibility: hidden;
  transition: border-color .3s, box-shadow .3s;
}
.hc-top { display: flex; align-items: center; gap: 9px; padding: 16px 19px 12px; font-family: var(--font-mono); font-size: .64rem; letter-spacing: .16em; text-transform: uppercase; color: var(--green); }
.hc-top i { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 7px rgba(11,122,62,.5); }
.helix-card-img { position: relative; flex: 1 1 auto; margin: 0 18px; border-radius: 8px; overflow: hidden; background: var(--light); }
.helix-card-img img { width: 100%; height: 100%; object-fit: cover; }
.helix-card-body { padding: 15px 19px 19px; }
.helix-card-name { display: block; font-family: var(--font-sans); font-size: 1.18rem; font-weight: 700; color: var(--text-primary); line-height: 1.12; }
.helix-card-key { display: block; margin-top: 7px; font-family: var(--font-mono); font-size: .66rem; letter-spacing: .03em; color: var(--text-muted); }

/* front-card highlight + corner brackets */
.helix-card.helix-front { border-color: var(--green); box-shadow: 0 0 0 1px var(--green), var(--shadow-xl); }
.hc-c { position: absolute; width: 15px; height: 15px; z-index: 3; border: 1.5px solid var(--green); opacity: 0; transition: opacity .3s; pointer-events: none; }
.hc-c.tl { top: 6px; left: 6px; border-right: 0; border-bottom: 0; }
.hc-c.tr { top: 6px; right: 6px; border-left: 0; border-bottom: 0; }
.hc-c.bl { bottom: 6px; left: 6px; border-right: 0; border-top: 0; }
.hc-c.br { bottom: 6px; right: 6px; border-left: 0; border-top: 0; }
.helix-front .hc-c { opacity: 1; }

/* spec panel (right) */
.hud-spec {
  position: absolute; top: 0; right: 0; bottom: 0; z-index: 3;
  width: clamp(340px, 37vw, 560px);
  padding: 0 clamp(30px, 4vw, 68px) 0 clamp(22px, 3vw, 42px);
  display: flex; flex-direction: column; justify-content: center;
  background: linear-gradient(90deg, rgba(255,255,255,0) 0%, var(--white) 32%);
  pointer-events: none;
}
.hud-spec .hud-spec-cta { pointer-events: auto; }
.hud-spec-head { display: flex; justify-content: space-between; align-items: baseline; font-family: var(--font-mono); font-size: .68rem; letter-spacing: .2em; text-transform: uppercase; color: var(--green); padding-bottom: 15px; margin-bottom: 22px; border-bottom: 1px solid var(--border); }
.hud-spec-head .idx { color: var(--text-faint); }
.hud-spec-name { font-family: var(--font-serif); font-weight: 400; font-size: clamp(1.9rem, 3.2vw, 2.9rem); color: var(--text-primary); line-height: 1.05; margin-bottom: 10px; }
.hud-spec-sub { font-family: var(--font-mono); font-size: .7rem; letter-spacing: .16em; text-transform: uppercase; color: var(--text-muted); margin-bottom: 28px; }
.hud-spec-rows { display: flex; flex-direction: column; }
.hud-spec-rows > div { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; padding: 13px 0; border-bottom: 1px dotted var(--border); }
.hud-spec-rows dt { font-family: var(--font-mono); font-size: .64rem; letter-spacing: .16em; text-transform: uppercase; color: var(--text-faint); white-space: nowrap; }
.hud-spec-rows dd { font-family: var(--font-mono); font-size: .82rem; color: var(--text-body); text-align: right; }
.hud-spec-rows dd.accent { color: var(--green); font-weight: 500; }
.hud-spec-cta { margin-top: 30px; align-self: flex-start; display: inline-flex; align-items: center; gap: 9px; font-size: .82rem; font-weight: 600; letter-spacing: .01em; color: #fff; background: var(--green); padding: 15px 26px; border-radius: 8px; transition: background .25s, transform .25s, box-shadow .25s; }
.hud-spec-cta span { transition: transform .25s; }
.hud-spec-cta:hover { background: var(--green-dark); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.hud-spec-cta:hover span { transform: translateX(4px); }

/* bottom pagination */
.hud-dots { position: absolute; bottom: clamp(22px, 3.6vh, 44px); left: 0; z-index: 4; width: 74%; display: flex; gap: 5px; justify-content: center; align-items: center; padding: 0 clamp(30px, 4vw, 68px); }
.hud-dots i { flex: 1 1 0; max-width: 20px; height: 2px; border-radius: 2px; background: var(--border); transition: background .3s, height .3s; }
.hud-dots i.on { background: var(--green); height: 5px; }
.hud-hint { position: absolute; bottom: clamp(20px, 3.4vh, 42px); right: clamp(30px, 4vw, 68px); z-index: 4; font-family: var(--font-mono); font-size: .62rem; letter-spacing: .18em; text-transform: uppercase; color: var(--text-faint); pointer-events: none; }

@media (prefers-reduced-motion: reduce) { .hud-live .dot { animation: none; } }

/* mobile: stack carousel over spec panel */
@media (max-width: 820px) {
  .hud-helix { height: auto; min-height: 100vh; min-height: 100dvh; }
  .hud-top { position: relative; top: 0; padding: 76px clamp(20px,5vw,28px) 0; font-size: .62rem; letter-spacing: .14em; }
  .hud-main { position: relative; inset: auto; }
  .helix-stage { position: relative; inset: auto; height: 52vh; min-height: 360px; perspective: 1100px; perspective-origin: 50% 50%; }
  .helix-axis, .helix { left: 50%; }
  .helix-card { width: 250px; height: 322px; margin: -161px 0 0 -125px; }
  .hud-spec { position: relative; top: auto; right: auto; bottom: auto; width: 100%; padding: 8px clamp(22px,6vw,32px) 30px; background: none; justify-content: flex-start; }
  .hud-spec-name { font-size: 2rem; }
  .hud-dots { position: relative; bottom: auto; width: 100%; margin: 6px 0 0; }
  .hud-hint { display: none; }
  .hud-corner { width: 18px; height: 18px; }
}