:root {
  --bg-color: #060913;
  --neon-cyan: #00f0ff;
  --neon-blue: #0070f3;
  --neon-red: #ff3366;
  --neon-yellow: #ffb800;
  --hud-bg: rgba(10, 18, 36, 0.7);
  --hud-border: rgba(0, 240, 255, 0.25);
  --text-main: #f0f6fc;
  --text-dim: #8fa0bd;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  user-select: none;
}

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: 'Zen Kaku Gothic New', sans-serif;
  overflow: hidden;
  width: 100vw;
  height: 100vh;
}

/* 3D Canvas */
#stage-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

/* HUD Overlay Layer */
.hud-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 1.5rem;
}

/* Header */
.hud-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.mission-tag {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.9rem;
  letter-spacing: 2px;
  color: var(--neon-cyan);
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 240, 255, 0.08);
  padding: 6px 16px;
  border-radius: 20px;
  border: 1px solid var(--hud-border);
}

.live-dot {
  width: 8px;
  height: 8px;
  background: var(--neon-cyan);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--neon-cyan);
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.3; transform: scale(0.8); }
}

.scale-meter {
  background: var(--hud-bg);
  padding: 6px 16px;
  border-radius: 20px;
  border: 1px solid var(--hud-border);
  font-family: 'Orbitron', sans-serif;
  font-size: 0.85rem;
}

.scale-label {
  color: var(--text-dim);
  margin-right: 6px;
}

.scale-value {
  color: var(--neon-yellow);
  font-weight: 700;
}

/* Stage Selector Top Center */
.stage-nav {
  position: absolute;
  top: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 0.8rem;
  pointer-events: auto;
  z-index: 20;
}

.stage-btn {
  background: var(--hud-bg);
  border: 1px solid var(--hud-border);
  color: var(--text-main);
  padding: 10px 20px;
  border-radius: 30px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: 'Zen Kaku Gothic New', sans-serif;
  font-weight: 700;
  font-size: 0.9rem;
  backdrop-filter: blur(12px);
  transition: all 0.3s ease;
}

.stage-btn:hover {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.3);
  transform: translateY(-2px);
}

.stage-btn.active {
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.25), rgba(0, 112, 243, 0.3));
  border-color: var(--neon-cyan);
  color: var(--neon-cyan);
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
}

/* Glass HUD Panels */
.glass-hud {
  background: var(--hud-bg);
  border: 1px solid var(--hud-border);
  border-radius: 16px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 1.5rem;
  pointer-events: auto;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
}

/* Left Panel */
.panel-left {
  position: absolute;
  top: 5rem;
  left: 1.5rem;
  width: 320px;
  max-height: calc(100vh - 10rem);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.panel-left h2 {
  font-size: 1.25rem;
  color: #fff;
  font-weight: 900;
  border-bottom: 2px solid var(--neon-cyan);
  padding-bottom: 0.4rem;
}

.panel-left .desc {
  font-size: 0.85rem;
  color: var(--text-dim);
  line-height: 1.6;
}

.control-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--neon-cyan);
  margin-bottom: 0.5rem;
  letter-spacing: 1px;
}

.mode-toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.mode-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-main);
  padding: 8px;
  border-radius: 8px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: 0.2s;
  font-weight: 700;
}

.mode-btn:hover {
  background: rgba(255, 255, 255, 0.1);
}

.mode-btn.active#btn-cool {
  background: rgba(0, 240, 255, 0.2);
  border-color: var(--neon-cyan);
  color: var(--neon-cyan);
  box-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
}

.mode-btn.active#btn-heat {
  background: rgba(255, 51, 102, 0.2);
  border-color: var(--neon-red);
  color: var(--neon-red);
  box-shadow: 0 0 10px rgba(255, 51, 102, 0.3);
}

.poi-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.poi-btn {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text-main);
  padding: 10px 14px;
  border-radius: 10px;
  cursor: pointer;
  text-align: left;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all 0.2s;
}

.poi-btn:hover {
  background: rgba(0, 240, 255, 0.12);
  border-color: var(--neon-cyan);
  transform: translateX(4px);
}

.poi-btn.active {
  background: rgba(0, 240, 255, 0.2);
  border-color: var(--neon-cyan);
  color: var(--neon-cyan);
  font-weight: 700;
}

.btn-reset-cam {
  background: transparent;
  border: 1px dashed var(--hud-border);
  color: var(--text-dim);
  padding: 8px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.8rem;
  transition: 0.2s;
}

.btn-reset-cam:hover {
  border-color: #fff;
  color: #fff;
}

/* Right Info Panel */
.panel-right {
  position: absolute;
  top: 5rem;
  right: 1.5rem;
  width: 340px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  animation: fadeInRight 0.4s ease;
}

@keyframes fadeInRight {
  from { opacity: 0; transform: translateX(20px); }
  to { opacity: 1; transform: translateX(0); }
}

.info-badge {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.7rem;
  color: var(--neon-yellow);
  letter-spacing: 1.5px;
}

.panel-right h3 {
  font-size: 1.3rem;
  color: #fff;
  margin-top: 4px;
  font-weight: 900;
}

.info-body p {
  font-size: 0.9rem;
  color: var(--text-dim);
  line-height: 1.7;
}

.science-fact {
  margin-top: 1rem;
  background: rgba(255, 184, 0, 0.08);
  border-left: 3px solid var(--neon-yellow);
  padding: 10px 12px;
  border-radius: 0 8px 8px 0;
}

.fact-tag {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--neon-yellow);
  display: block;
  margin-bottom: 4px;
}

.science-fact p {
  font-size: 0.8rem;
  color: #e6e6e6;
  line-height: 1.5;
}

/* Center Crosshair */
.crosshair-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  pointer-events: none;
  opacity: 0.4;
  transition: opacity 0.3s;
}

.reticle {
  width: 40px;
  height: 40px;
  border: 1px solid var(--neon-cyan);
  border-radius: 50%;
  position: relative;
}

.reticle::before, .reticle::after {
  content: '';
  position: absolute;
  background: var(--neon-cyan);
}

.reticle::before {
  top: 50%;
  left: -8px;
  right: -8px;
  height: 1px;
  transform: translateY(-50%);
}

.reticle::after {
  left: 50%;
  top: -8px;
  bottom: -8px;
  width: 1px;
  transform: translateX(-50%);
}

.scanner-text {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.7rem;
  color: var(--neon-cyan);
  margin-top: 8px;
  letter-spacing: 1px;
}

/* Footer Guide */
.hud-footer {
  display: flex;
  justify-content: center;
  gap: 2rem;
  background: rgba(0, 0, 0, 0.4);
  padding: 8px 24px;
  border-radius: 20px;
  margin: 0 auto;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.guide-item {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.key {
  color: #fff;
  font-weight: 700;
}

@media (max-width: 900px) {
  .panel-left {
    width: calc(100% - 3rem);
    top: auto;
    bottom: 4rem;
    max-height: 35vh;
  }
  .panel-right {
    display: none; /* Collapsed on mobile for screen room */
  }
  .stage-nav {
    top: 4.5rem;
    width: 90%;
    justify-content: center;
  }
  .stage-btn {
    padding: 6px 12px;
    font-size: 0.75rem;
  }
}