/* ============================================================
   M.O. SYSTEM — LIVE DEMOS · stage + HUD styles
   Shared by every project demo; demo/controls.css adds the
   widgets the non-wafer demos need. Layers above
   app/projects/styles/case-study.css: corner reticles, mono
   micro K/V rows, hairline plates, signal cyan accents.
   Controls live on a right-edge CONSOLE rail, which becomes a
   swipeable bottom toolbar on phones.
   ============================================================ */

/* ---------------- layer shell ---------------- */
.hvd {
  position: fixed;
  inset: 0;
  z-index: 44;
  visibility: hidden;
  opacity: 0;
  transition: opacity 520ms var(--e-out), visibility 520ms;
}
.hvd--active { visibility: visible; opacity: 1; }
.hvd--exit { opacity: 0; }

.hvd__stage {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 90% at 44% 38%, #070b15 0%, var(--void) 62%),
    var(--void);
  pointer-events: auto;
  cursor: grab;
}
.hvd__stage:active { cursor: grabbing; }
.hvd__stage canvas { display: block; width: 100%; height: 100%; }

/* page below is fully covered; lock scroll while demoing */
body.hv-demoing { overflow: hidden; }
body.hv-demoing .pp-shell { opacity: 0; pointer-events: none; transition: opacity 360ms var(--e-out); }
body.hv-demoing .hv-demo { opacity: 0; pointer-events: none; }
body.hv-demoing .hv-stage { opacity: 0 !important; transition: opacity 420ms var(--e-out); }

/* fade-only entrance (never touches transform — centred/anchored
   elements keep their positioning transforms) */
@keyframes hvdFadeIn { from { opacity: 0; } to { opacity: 1; } }

/* ---------------- frame ---------------- */
.hvd__corner { position: absolute; width: 30px; height: 30px; border: 1px solid var(--signal); opacity: 0.55; pointer-events: none; }
.hvd__corner--tl { top: var(--s-7); left: var(--s-7); border-right: 0; border-bottom: 0; }
.hvd__corner--tr { top: var(--s-7); right: var(--s-7); border-left: 0; border-bottom: 0; }
.hvd__corner--bl { bottom: var(--s-7); left: var(--s-7); border-right: 0; border-top: 0; }
.hvd__corner--br { bottom: var(--s-7); right: var(--s-7); border-left: 0; border-top: 0; }

/* ---------------- shared HUD text ---------------- */
.hvd__hud, .hvd__tele {
  position: absolute;
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  font-family: var(--ff-mono);
  font-size: var(--fs-micro);
  letter-spacing: var(--tr-caps);
  text-transform: uppercase;
  pointer-events: none;
}
.hvd__hud { top: var(--s-7); left: var(--s-8); }
.hvd__tele { bottom: var(--s-8); left: var(--s-8); animation: hvdFadeIn 480ms var(--e-out) both; }
.hvd__hudRow { display: flex; gap: var(--s-4); align-items: baseline; }
.hvd__hudK { color: var(--ghost); min-width: 72px; }
.hvd__hudV { color: var(--bone); }
.hvd__hudV.is-live { color: var(--signal); text-shadow: 0 0 6px var(--signal-glow); }

.hvd__title {
  position: absolute; top: var(--s-7); left: 50%; transform: translateX(-50%);
  font-family: var(--ff-mono); font-size: var(--fs-micro);
  letter-spacing: var(--tr-caps); text-transform: uppercase; color: var(--ash);
  pointer-events: none; white-space: nowrap;
}
.hvd__title b { color: var(--bone); font-weight: 500; }

/* ---------------- top-right controls ---------------- */
.hvd__topRight {
  position: absolute; top: var(--s-7); right: var(--s-8);
  display: flex; align-items: center; gap: var(--s-4);
}
.hvd__close {
  display: inline-flex; align-items: center; gap: var(--s-3);
  padding: var(--s-3) var(--s-5);
  background: rgba(4, 6, 13, 0.7); border: 1px solid var(--signal);
  font-family: var(--ff-mono); font-size: var(--fs-nano); letter-spacing: var(--tr-caps);
  text-transform: uppercase; color: var(--signal); cursor: pointer;
}
.hvd__close:hover { background: var(--signal-ghost); }
.hvd__closeSep { width: 10px; height: 1px; background: var(--signal-dim); }

/* generic hud button */
.hvd-btn {
  display: inline-flex; align-items: center; gap: var(--s-3);
  padding: var(--s-3) var(--s-5);
  font-family: var(--ff-mono); font-size: var(--fs-nano); letter-spacing: var(--tr-caps); text-transform: uppercase;
  border: 1px solid var(--hairline); color: var(--ash);
  background: rgba(7, 9, 15, 0.7); cursor: pointer;
  transition: border-color var(--d-fast), color var(--d-fast), background var(--d-fast);
}
.hvd-btn:hover { border-color: var(--signal); color: var(--signal); }
.hvd-btn.is-on { border-color: var(--signal); color: var(--signal); }

/* sound toggle EQ bars */
.hvd-eq { display: inline-flex; align-items: flex-end; gap: 2px; height: 10px; }
.hvd-eq i { width: 2px; height: 3px; background: currentColor; }
.hvd-btn--snd.is-on .hvd-eq i { animation: hvdEq 1.1s ease-in-out infinite; }
.hvd-btn--snd.is-on .hvd-eq i:nth-child(2) { animation-delay: 0.21s; }
.hvd-btn--snd.is-on .hvd-eq i:nth-child(3) { animation-delay: 0.34s; }
@keyframes hvdEq {
  0%, 100% { height: 3px; }
  50% { height: 10px; }
}
@media (prefers-reduced-motion: reduce) {
  .hvd-btn--snd.is-on .hvd-eq i { animation: none; height: 7px; }
}

/* ---------------- intro boot console ---------------- */
.hvd__boot {
  position: absolute; bottom: var(--s-8); left: var(--s-8);
  display: flex; flex-direction: column; gap: var(--s-3);
  font-family: var(--ff-mono); font-size: var(--fs-micro);
  letter-spacing: var(--tr-caps); text-transform: uppercase; color: var(--ash);
}
.hvd__bootLine {
  display: flex; gap: var(--s-4); align-items: baseline;
  animation: hvdFadeIn 360ms var(--e-out) both;
}
.hvd__bootCaret { color: var(--signal); }
.hvd__skip { margin-top: var(--s-4); align-self: flex-start; pointer-events: auto; }

/* ---------------- typing playground ---------------- */
.hvd__type {
  position: absolute; bottom: var(--s-8); left: 50%; transform: translateX(-50%);
  display: inline-flex; align-items: center; gap: var(--s-4);
  font-family: var(--ff-mono); font-size: var(--fs-meta);
  letter-spacing: var(--tr-wide); color: var(--ghost);
  pointer-events: none; white-space: pre;
  max-width: min(58vw, 700px);
  animation: hvdFadeIn 480ms var(--e-out) both;
}
.hvd__typeK { color: var(--signal); }
.hvd__type.has-text .hvd__typeV { color: var(--bone); }
.hvd__typeCaret {
  width: 7px; height: 15px; background: var(--signal);
  animation: hvdCaret 1.06s steps(1) infinite;
}
@keyframes hvdCaret { 50% { opacity: 0; } }

/* ---------------- right-edge CONSOLE rail ---------------- */
.hvd__rail {
  position: absolute;
  right: var(--s-7);
  top: 50%;
  transform: translateY(-50%);
  width: 212px;
  display: flex;
  flex-direction: column;
  background: rgba(7, 9, 15, 0.82);
  border: 1px solid var(--hairline);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  animation: hvdFadeIn 520ms var(--e-out) both;
}
/* corner ticks — signal reticle detail, like the landing plates */
.hvd__rail::before, .hvd__rail::after {
  content: "";
  position: absolute;
  width: 8px; height: 8px;
  border: 1px solid var(--signal);
  opacity: 0.7;
  pointer-events: none;
}
.hvd__rail::before { top: -1px; left: -1px; border-right: 0; border-bottom: 0; }
.hvd__rail::after { bottom: -1px; right: -1px; border-left: 0; border-top: 0; }

.hvd__railHead {
  display: flex; align-items: center; gap: var(--s-4);
  padding: var(--s-4) var(--s-5);
  border-bottom: 1px solid var(--hairline);
  font-family: var(--ff-mono); font-size: var(--fs-nano);
  letter-spacing: var(--tr-caps); text-transform: uppercase; color: var(--ash);
}
.hvd__railDot { width: 6px; height: 6px; border-radius: 50%; background: var(--signal); box-shadow: 0 0 8px var(--signal); }

.hvd__railSec {
  display: flex; flex-direction: column; gap: var(--s-4);
  padding: var(--s-5);
}
.hvd__railSec + .hvd__railSec { border-top: 1px solid var(--hairline); }
.hvd__railRow { display: flex; align-items: baseline; justify-content: space-between; }
.hvd__railK {
  font-family: var(--ff-mono); font-size: var(--fs-nano); letter-spacing: var(--tr-caps);
  text-transform: uppercase; color: var(--ghost);
}
.hvd__railV {
  font-family: var(--ff-mono); font-size: var(--fs-nano); letter-spacing: var(--tr-caps);
  color: var(--signal);
}

.hvd__segRow { display: flex; gap: var(--s-3); }

.hvd-seg {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--s-3);
  flex: 1;
  padding: var(--s-3) var(--s-4);
  font-family: var(--ff-mono); font-size: var(--fs-nano); letter-spacing: var(--tr-caps); text-transform: uppercase;
  border: 1px solid var(--hairline); color: var(--ash);
  background: transparent; cursor: pointer;
  transition: border-color var(--d-fast), color var(--d-fast), background var(--d-fast);
}
.hvd-seg:hover { border-color: var(--signal); color: var(--signal); }
.hvd-seg.is-on { border-color: var(--signal); color: var(--signal); background: var(--signal-ghost); }
.hvd-seg--grow { width: 100%; }
.hvd-seg__dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; }

/* explode slider */
.hvd__slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%; height: 2px;
  background: var(--hairline);
  outline: none;
  cursor: pointer;
}
.hvd__slider::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 12px; height: 12px;
  background: var(--void);
  border: 1px solid var(--signal);
  box-shadow: 0 0 8px var(--signal-glow);
  cursor: ew-resize;
}
.hvd__slider::-moz-range-thumb {
  width: 12px; height: 12px; border-radius: 0;
  background: var(--void);
  border: 1px solid var(--signal);
  box-shadow: 0 0 8px var(--signal-glow);
  cursor: ew-resize;
}

.hvd__hint {
  position: absolute; bottom: var(--s-4); left: 50%; transform: translateX(-50%);
  font-family: var(--ff-mono); font-size: var(--fs-nano);
  letter-spacing: var(--tr-caps); text-transform: uppercase; color: var(--shadow);
  pointer-events: none; white-space: nowrap;
  animation: hvdFadeIn 520ms var(--e-out) both;
}

/* ---------------- small screens ---------------- */
@media (max-width: 900px) {
  .hvd__hud { left: var(--s-6); top: var(--s-6); }
  .hvd__tele { display: none; }
  .hvd__title { display: none; }
  .hvd__topRight { right: var(--s-6); top: var(--s-6); }
  .hvd__hint { display: none; }
  .hvd__type { bottom: auto; top: 84px; max-width: 86vw; }
  /* console becomes a swipeable bottom toolbar — never covers the board */
  .hvd__rail {
    top: auto; bottom: calc(var(--s-5) + env(safe-area-inset-bottom));
    right: var(--s-5); left: var(--s-5);
    transform: none; width: auto;
    flex-direction: row; flex-wrap: nowrap; align-items: stretch;
    overflow-x: auto; overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .hvd__railHead { display: none; }
  .hvd__railSec { flex: 0 0 auto; padding: var(--s-4) var(--s-5); justify-content: center; }
  .hvd__railSec + .hvd__railSec { border-top: 0; border-left: 1px solid var(--hairline); }
  .hvd__slider { width: 124px; }
}