/* ================================================
   Gesture Cosmos — Fullscreen Immersive Experience
   ================================================ */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #000;
  color: #d0dce8;
  font-family: "SF Mono", "Fira Code", "JetBrains Mono", "Cascadia Code",
    monospace;
}

/* ---- Canvas ---- */

#cosmos {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

#camera {
  display: none;
}

/* ---- HUD ---- */

#hud {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  pointer-events: none;
  z-index: 20;
}

#back-btn {
  pointer-events: auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  background: rgba(0, 8, 16, 0.45);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: rgba(255, 255, 255, 0.55);
  text-decoration: none;
  font-size: 13px;
  transition: all 0.25s ease;
}

#back-btn:hover {
  color: rgba(0, 230, 255, 0.9);
  border-color: rgba(0, 230, 255, 0.3);
  box-shadow: 0 0 24px rgba(0, 200, 255, 0.08);
}

#status-panel {
  padding: 14px 20px;
  border: 1px solid rgba(0, 200, 255, 0.15);
  border-radius: 12px;
  background: rgba(0, 8, 20, 0.55);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  text-align: right;
  box-shadow: 0 0 40px rgba(0, 180, 255, 0.04),
    inset 0 0 30px rgba(0, 180, 255, 0.02);
}

#gesture-label {
  font-size: 14px;
  color: rgba(0, 220, 255, 0.85);
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

#fps-counter {
  font-size: 11px;
  color: rgba(255, 255, 255, 0.3);
  letter-spacing: 0.5px;
}

/* ---- Gesture Guide ---- */

#gesture-guide {
  position: fixed;
  bottom: 22px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 20px;
  padding: 10px 28px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  background: rgba(0, 5, 12, 0.5);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  font-size: 12px;
  color: rgba(255, 255, 255, 0.4);
  white-space: nowrap;
  z-index: 20;
  opacity: 0;
  animation: guideIn 0.5s ease 1.8s forwards;
}

#gesture-guide span {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ---- Loading ---- */

#loading-overlay {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: #000;
  z-index: 100;
  transition: opacity 0.8s ease;
}

#loading-overlay.fade-out {
  opacity: 0;
  pointer-events: none;
}

#loading-content {
  text-align: center;
}

#loading-spinner {
  width: 44px;
  height: 44px;
  margin: 0 auto 22px;
  border: 2px solid rgba(0, 180, 255, 0.12);
  border-top-color: rgba(0, 220, 255, 0.75);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  box-shadow: 0 0 28px rgba(0, 180, 255, 0.06);
}

#loading-text {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
  letter-spacing: 0.5px;
}

/* ---- Error ---- */

#error-overlay {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(0, 0, 0, 0.95);
  z-index: 100;
}

#error-overlay[hidden] {
  display: none;
}

#error-content {
  text-align: center;
  max-width: 380px;
  padding: 40px;
}

#error-text {
  font-size: 15px;
  color: rgba(255, 140, 140, 0.85);
  line-height: 1.7;
  margin-bottom: 28px;
  font-family: inherit;
}

.btn-back {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 24px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  font-size: 13px;
  font-family: inherit;
  transition: all 0.25s ease;
}

.btn-back:hover {
  border-color: rgba(0, 200, 255, 0.3);
  color: rgba(0, 220, 255, 0.9);
}

/* ---- Animations ---- */

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes guideIn {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

/* ---- Mobile ---- */

@media (max-width: 640px) {
  #gesture-guide {
    gap: 10px;
    padding: 8px 16px;
    font-size: 11px;
  }

  #hud {
    padding: 14px 16px;
  }

  #status-panel {
    padding: 10px 14px;
  }
}