:root {
  --bg-dark: #010a0c;
  --hud-green: #00ff66;
  --hud-green-dim: rgba(0, 255, 102, 0.3);
  --hud-red: #ff3333;
  
  --font-hud: 'Share Tech Mono', monospace;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-dark);
  color: var(--hud-green);
  font-family: var(--font-hud);
  line-height: 1.5;
  text-shadow: 0 0 4px rgba(0, 255, 102, 0.4);
}

.hud-container {
  max-width: 950px;
  margin: 0 auto;
  padding: 60px 20px;
}

.hud-header {
  border-bottom: 2px solid var(--hud-green-dim);
  padding-bottom: 25px;
  margin-bottom: 40px;
}

.nav-back {
  display: inline-block;
  color: #fff;
  border: 1px solid var(--hud-green);
  background: rgba(0, 255, 102, 0.05);
  text-decoration: none;
  font-size: 0.85rem;
  padding: 4px 12px;
  letter-spacing: 1px;
}

.nav-back:hover {
  background: var(--hud-green);
  color: var(--bg-dark);
}

.hud-title {
  font-size: clamp(2.3rem, 5vw, 3.8rem);
  color: #fff;
  margin: 20px 0 5px 0;
  letter-spacing: 1px;
}

.hud-subtitle {
  font-size: 0.9rem;
  opacity: 0.8;
}

.hud-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 30px;
}

/* Tactical HUD Cards */
.hud-card {
  background: rgba(1, 10, 12, 0.9);
  border: 1px solid var(--hud-green-dim);
  padding: 30px;
  position: relative;
  box-shadow: 0 10px 30px rgba(0,0,0,0.8);
}

.hud-tag {
  position: absolute;
  top: 5px;
  left: 8px;
  font-size: 8px;
  opacity: 0.6;
}

.hud-card h2 {
  font-size: 1.25rem;
  color: #fff;
  margin-top: 5px;
}

.hud-card p {
  font-size: 0.9rem;
  opacity: 0.85;
}

.divider {
  height: 1px;
  background-color: var(--hud-green-dim);
  margin-bottom: 15px;
}

.alert-banner {
  border: 1px solid var(--hud-green);
  padding: 8px;
  text-align: center;
  font-weight: bold;
  margin-top: 15px;
  background-color: rgba(0, 255, 102, 0.05);
}

.blinking {
  animation: blink 1.2s step-end infinite;
}

@keyframes blink {
  from, to { opacity: 0.3; }
  50% { opacity: 1; }
}

.hud-btn {
  width: 100%;
  background: transparent;
  border: 1px solid var(--hud-green);
  color: var(--hud-green);
  font-family: inherit;
  font-size: 0.9rem;
  padding: 10px;
  margin-top: 15px;
  cursor: pointer;
  text-shadow: inherit;
  transition: all 0.2s;
}

.hud-btn:hover {
  background: var(--hud-green);
  color: var(--bg-dark);
}

/* Circular Radar scope */
.radar-viewport {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 25px;
}

.radar-scope {
  width: 130px;
  height: 130px;
  border-radius: 50%;
  border: 2px solid var(--hud-green);
  background: 
    radial-gradient(circle, transparent 30%, var(--hud-green-dim) 31%, transparent 32%, transparent 60%, var(--hud-green-dim) 61%, transparent 62%),
    linear-gradient(rgba(0,255,102,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,255,102,0.04) 1px, transparent 1px);
  background-size: 100% 100%, 15px 15px, 15px 15px;
  position: relative;
  overflow: hidden;
}

.radar-sweep-line {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100px;
  height: 2px;
  background: linear-gradient(90deg, var(--hud-green), transparent);
  transform-origin: left center;
  transform: rotate(0deg);
}

.radar-target {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--hud-red);
  position: absolute;
  opacity: 0;
  box-shadow: 0 0 6px var(--hud-red);
  transition: opacity 0.5s;
}

.target-1 { top: 25px; left: 40px; }
.target-2 { top: 80px; left: 90px; }
.target-3 { top: 50px; left: 100px; }

.radar-target.spotted {
  opacity: 1;
}