@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&family=Share+Tech+Mono&display=swap');

:root {
  --hud-green: #33ff33;
  --hud-green-dim: #1a7a1a;
  --hud-green-dark: #0a2a0a;
  --hud-bg: rgba(0, 6, 0, 0.92);
  --hud-border: #33ff33;
  --hud-glow: rgba(51, 255, 51, 0.25);
  --hud-red: #ff2020;
  --hud-red-glow: rgba(255, 32, 32, 0.35);
  --hud-yellow: #ffcc00;
  --hud-yellow-glow: rgba(255, 204, 0, 0.35);
  --hud-cyan: #00ffff;
  --hud-cyan-glow: rgba(0, 255, 255, 0.2);
  --hud-white: #e0e0e0;
  --hud-grey: #888888;
  --hud-orange: #ff6600;
  --hud-orange-glow: rgba(255, 102, 0, 0.3);
  --font-mono: 'Share Tech Mono', 'Courier New', monospace;
  --font-display: 'Orbitron', 'Courier New', monospace;
  --panel-bg: rgba(0, 4, 0, 0.88);
  --panel-border: #33ff33;
  --panel-glow: rgba(51, 255, 51, 0.12);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  overflow: hidden;
  background: #000;
  font-family: var(--font-mono);
  color: var(--hud-green);
}

canvas { display: block; }

/* Scanline overlay */
body::after {
  content: '';
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: repeating-linear-gradient(
    0deg,
    transparent 0px,
    transparent 2px,
    rgba(0, 255, 0, 0.03) 2px,
    rgba(0, 255, 0, 0.03) 3px
  );
  pointer-events: none;
  z-index: 9999;
}

/* ============================================================
   FOUR-QUADRANT HUD LAYOUT — Command Console Hierarchy
   ============================================================ */

/* Shared panel base — enhanced command-console styling */
.hud-panel {
  position: absolute;
  color: var(--hud-green);
  font-size: 11px;
  font-family: var(--font-mono);
  background: var(--panel-bg);
  border: 1.5px solid var(--panel-border);
  border-radius: 2px;
  pointer-events: none;
  line-height: 1.35;
  text-shadow: 0 0 3px var(--hud-glow), 0 0 1px var(--hud-green);
  box-shadow: inset 0 0 20px var(--panel-glow), 0 0 12px var(--panel-glow);
  padding: 6px 8px;
  letter-spacing: 0.5px;
}

/* TOP-LEFT: Mission Intent & Objective — high-visibility band */
#hud-mission {
  position: absolute;
  top: 8px; left: 8px;
  min-width: 240px;
  max-width: 340px;
  border-left: 3px solid var(--hud-cyan);
  box-shadow: inset 0 0 20px var(--panel-glow), 0 0 12px var(--panel-glow), -2px 0 4px var(--hud-cyan-glow);
}

/* TOP-RIGHT: Flight State (velocity, altitude, heading) */
#hud-flight {
  position: absolute;
  top: 8px; right: 8px;
  min-width: 220px;
  max-width: 300px;
  text-align: right;
  border-right: 3px solid var(--hud-green);
  box-shadow: inset 0 0 20px var(--panel-glow), 0 0 12px var(--panel-glow), 2px 0 4px var(--hud-glow);
}

/* BOTTOM-LEFT: Sensor & Weapon State */
#hud-sensor-weapon {
  position: absolute;
  bottom: 24px; left: 8px;
  min-width: 220px;
  max-width: 300px;
  border-left: 3px solid var(--hud-yellow);
  box-shadow: inset 0 0 20px var(--panel-glow), 0 0 12px var(--panel-glow), -2px 0 4px var(--hud-yellow-glow);
}

/* BOTTOM-RIGHT: Threats */
#hud-threats {
  position: absolute;
  bottom: 24px; right: 8px;
  min-width: 220px;
  max-width: 300px;
  text-align: right;
  border-right: 3px solid var(--hud-red);
  box-shadow: inset 0 0 20px var(--panel-glow), 0 0 12px var(--panel-glow), 2px 0 4px var(--hud-red-glow);
}

/* Panel section dividers — stronger separation */
.hud-panel .hud-section {
  border-bottom: 1.5px solid var(--hud-green-dim);
  padding-bottom: 4px;
  margin-bottom: 4px;
}
.hud-panel .hud-section:last-child { border-bottom: none; }

/* HUD labels and values */
.hud-panel .hud-label {
  color: var(--hud-grey);
  font-size: 10px;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.hud-panel .hud-value {
  color: var(--hud-white);
  font-weight: bold;
  letter-spacing: 1px;
}
.hud-panel .hud-value-green { color: var(--hud-green); }
.hud-panel .hud-value-cyan { color: var(--hud-cyan); text-shadow: 0 0 4px var(--hud-cyan-glow); }
.hud-panel .hud-value-yellow { color: var(--hud-yellow); text-shadow: 0 0 4px var(--hud-yellow-glow); }
.hud-panel .hud-value-red { color: var(--hud-red); text-shadow: 0 0 4px var(--hud-red-glow); }
.hud-panel .hud-value-orange { color: var(--hud-orange); text-shadow: 0 0 4px var(--hud-orange-glow); }

/* Threat and warning colors */
.hud-panel .threat {
  color: var(--hud-red);
  text-shadow: 0 0 6px var(--hud-red-glow), 0 0 1px var(--hud-red);
}
.hud-panel .warn {
  color: var(--hud-yellow);
  text-shadow: 0 0 6px var(--hud-yellow-glow), 0 0 1px var(--hud-yellow);
}

/* HP bar */
.hud-panel .hp-bar-container {
  display: inline-block;
  width: 60px;
  height: 8px;
  background: #1a0a0a;
  border: 1px solid var(--hud-green-dim);
  vertical-align: middle;
  position: relative;
  overflow: hidden;
}
.hud-panel .hp-bar-fill {
  display: block;
  height: 100%;
  transition: width 0.1s;
}
.hud-panel .hp-bar-fill.high { background: var(--hud-green); }
.hud-panel .hp-bar-fill.med { background: var(--hud-yellow); }
.hud-panel .hp-bar-fill.low { background: var(--hud-red); }

/* Objective styling */
.hud-panel .obj-complete { color: var(--hud-green); }
.hud-panel .obj-failed { color: var(--hud-red); }
.hud-panel .obj-pending { color: var(--hud-yellow); }
.hud-panel .obj-optional { color: var(--hud-grey); }

/* Mission title */
.hud-panel .mission-title {
  color: var(--hud-cyan);
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 2px;
  text-shadow: 0 0 6px var(--hud-cyan-glow);
}
.hud-panel .mission-location {
  color: var(--hud-grey);
  font-size: 10px;
}

/* Score display */
.hud-panel .score-title {
  color: var(--hud-yellow);
  font-size: 11px;
  letter-spacing: 1px;
}
.hud-panel .score-total {
  color: var(--hud-white);
  font-size: 14px;
  letter-spacing: 3px;
  font-family: var(--font-display);
}

/* ============================================================
   CONTACT LEGEND OVERLAY — Enhanced with distinct symbol shapes/colors
   ============================================================ */
#contact-legend {
  position: absolute;
  top: 50%;
  right: 10px;
  transform: translateY(-50%);
  background: var(--panel-bg);
  border: 1.5px solid var(--panel-border);
  border-radius: 3px;
  padding: 5px 8px;
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--hud-white);
  line-height: 1.7;
  pointer-events: none;
  box-shadow: inset 0 0 10px var(--panel-glow), 0 0 8px var(--panel-glow);
  opacity: 0.9;
  z-index: 50;
  min-width: 160px;
}
#contact-legend .legend-title {
  color: var(--hud-green);
  font-size: 9px;
  letter-spacing: 3px;
  text-transform: uppercase;
  border-bottom: 1.5px solid var(--hud-green-dim);
  padding-bottom: 3px;
  margin-bottom: 3px;
  display: block;
  text-shadow: 0 0 4px var(--hud-glow);
}
#contact-legend .legend-row {
  white-space: nowrap;
  padding: 1px 0;
}
#contact-legend .legend-symbol {
  display: inline-block;
  width: 20px;
  text-align: center;
  font-size: 14px;
  font-weight: bold;
  text-shadow: 0 0 4px currentColor;
}
#contact-legend .legend-text {
  font-size: 10px;
  color: var(--hud-grey);
}

/* ============================================================
   CAMERA MODE & SENSOR MODE INDICATORS — Enhanced readability
   ============================================================ */
#camera-mode-indicator {
  position: absolute;
  bottom: 48%;
  left: 50%;
  transform: translate(-50%, 50%);
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 4px;
  text-shadow: 0 0 8px var(--hud-glow), 0 0 4px var(--hud-green);
  color: var(--hud-green);
  opacity: 0.75;
  pointer-events: none;
  text-align: center;
  z-index: 40;
  background: rgba(0, 4, 0, 0.5);
  padding: 3px 12px;
  border: 1px solid rgba(51, 255, 51, 0.2);
  border-radius: 2px;
}

#sensor-mode-indicator {
  position: absolute;
  bottom: calc(48% - 24px);
  left: 50%;
  transform: translate(-50%, 50%);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 3px;
  color: var(--hud-cyan);
  opacity: 0.7;
  pointer-events: none;
  text-align: center;
  z-index: 40;
  text-shadow: 0 0 4px var(--hud-cyan-glow);
}

/* ============================================================
   CONTROL HINT OVERLAY (first 10 seconds) — Enhanced visibility
   ============================================================ */
#control-hints {
  position: absolute;
  bottom: 38%;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--hud-green);
  opacity: 0.85;
  pointer-events: none;
  text-align: center;
  letter-spacing: 2px;
  line-height: 1.6;
  z-index: 30;
  background: rgba(0, 4, 0, 0.75);
  padding: 5px 14px;
  border: 1px solid rgba(51, 255, 51, 0.3);
  border-radius: 2px;
  text-shadow: 0 0 6px var(--hud-glow), 0 0 2px var(--hud-green);
}

/* ============================================================
   STATUS LINE (bottom-left legacy)
   ============================================================ */
#info {
  position: absolute;
  bottom: 20px; left: 20px;
  color: var(--hud-green);
  font-size: 12px;
  font-family: var(--font-mono);
  opacity: 0.6;
  pointer-events: none;
  letter-spacing: 1px;
  z-index: 20;
}

/* ============================================================
   CONTROL PANEL (bottom-right legacy)
   ============================================================ */
#controls {
  position: absolute;
  bottom: 20px; right: 20px;
  color: var(--hud-green);
  font-size: 10px;
  font-family: var(--font-mono);
  background: var(--hud-bg);
  padding: 8px 10px;
  border: 1px solid var(--hud-green-dim);
  pointer-events: auto;
  line-height: 1.5;
  border-radius: 2px;
  z-index: 20;
}
#controls input, #controls button { pointer-events: auto; cursor: pointer; }
#controls button {
  background: #000;
  color: var(--hud-green);
  border: 1px solid var(--hud-green);
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 2px 8px;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: background 0.2s, color 0.2s;
}
#controls button:hover {
  background: var(--hud-green);
  color: #000;
}
#controls input[type=range] {
  width: 50px;
  background: #111;
  accent-color: var(--hud-green);
  vertical-align: middle;
}

/* ============================================================
   UPGRADE PANEL (unchanged)
   ============================================================ */
#upgrade-panel {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  color: var(--hud-green);
  font-size: 12px;
  font-family: var(--font-mono);
  background: var(--hud-bg);
  padding: 20px;
  border: 2px solid var(--hud-border);
  pointer-events: auto;
  line-height: 1.6;
  z-index: 100;
  min-width: 640px;
  max-width: 800px;
  max-height: 80vh;
  overflow-y: auto;
  display: none;
  text-shadow: 0 0 2px var(--hud-glow);
  box-shadow: 0 0 25px rgba(0, 255, 0, 0.15), inset 0 0 30px rgba(0, 255, 0, 0.05);
  border-radius: 4px;
}
#upgrade-panel h2 {
  text-align: center;
  margin: 0 0 10px 0;
  font-size: 16px;
  border-bottom: 1px solid var(--hud-border);
  padding-bottom: 6px;
  letter-spacing: 4px;
  font-family: var(--font-display);
  color: var(--hud-cyan);
}
#upgrade-panel .cat-title {
  font-size: 14px;
  font-weight: bold;
  margin: 8px 0 4px 0;
  padding: 4px 0;
  border-bottom: 1px dashed var(--hud-border);
  cursor: pointer;
  color: var(--hud-green);
}
#upgrade-panel .cat-title:hover { color: var(--hud-yellow); }
#upgrade-panel .cat-title .arrow { display: inline-block; width: 12px; }
#upgrade-panel .upgrade-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 3px 6px;
  margin: 2px 0;
}
#upgrade-panel .upgrade-row:hover { background: rgba(0, 255, 0, 0.05); }
#upgrade-panel .upgrade-name { flex: 1; color: var(--hud-white); }
#upgrade-panel .upgrade-desc { flex: 2; font-size: 11px; color: var(--hud-green-dim); }
#upgrade-panel .upgrade-cost { width: 50px; text-align: right; color: var(--hud-yellow); }
#upgrade-panel .upgrade-btn {
  background: #000;
  color: var(--hud-green);
  border: 1px solid var(--hud-border);
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 2px 10px;
  cursor: pointer;
  width: 60px;
  text-align: center;
  transition: background 0.2s, color 0.2s;
}
#upgrade-panel .upgrade-btn:hover { background: var(--hud-green); color: #000; }
#upgrade-panel .upgrade-btn.owned { background: #003300; color: #00ff00; border-color: #00ff00; cursor: default; }
#upgrade-panel .upgrade-btn.locked { background: #330000; color: #ff3333; border-color: #ff3333; cursor: not-allowed; }
#upgrade-panel .upgrade-btn.purchasable { background: #000; color: var(--hud-yellow); border-color: var(--hud-yellow); }
#upgrade-panel .score-display {
  text-align: center;
  margin: 8px 0;
  padding: 6px;
  border: 1px solid var(--hud-border);
  font-size: 14px;
  letter-spacing: 3px;
  font-family: var(--font-display);
  color: var(--hud-cyan);
}
#upgrade-panel .close-btn {
  position: absolute;
  top: 8px; right: 12px;
  background: #000;
  color: var(--hud-green);
  border: 1px solid var(--hud-border);
  font-family: var(--font-mono);
  font-size: 14px;
  cursor: pointer;
  padding: 2px 10px;
  transition: background 0.2s, color 0.2s;
}
#upgrade-panel .close-btn:hover { background: var(--hud-green); color: #000; }
#upgrade-panel .category-body { padding-left: 12px; }
#upgrade-panel .upgrade-status { font-size: 11px; color: #00ff00; }
#upgrade-panel .upgrade-locked { font-size: 11px; color: #ff3333; }

/* ============================================================
   MISSION MENU (unchanged)
   ============================================================ */
#mission-menu {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  color: var(--hud-green);
  font-size: 12px;
  font-family: var(--font-mono);
  background: var(--hud-bg);
  padding: 20px;
  border: 2px solid var(--hud-border);
  pointer-events: auto;
  line-height: 1.6;
  z-index: 100;
  min-width: 400px;
  display: none;
  text-shadow: 0 0 2px var(--hud-glow);
  box-shadow: 0 0 25px rgba(0, 255, 0, 0.15), inset 0 0 20px rgba(0, 255, 0, 0.05);
  border-radius: 4px;
}
#mission-menu h2 {
  text-align: center;
  margin: 0 0 10px 0;
  font-size: 16px;
  border-bottom: 1px solid var(--hud-border);
  padding-bottom: 6px;
  letter-spacing: 4px;
  font-family: var(--font-display);
  color: var(--hud-cyan);
}
#mission-menu .mission-item {
  padding: 4px 8px;
  margin: 2px 0;
  border: 1px solid transparent;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}
#mission-menu .mission-item:hover {
  border-color: var(--hud-green-dim);
  background: rgba(0, 255, 0, 0.05);
}
#mission-menu .mission-item.selected {
  border-color: var(--hud-border);
  background: rgba(0, 255, 0, 0.1);
}
#mission-menu .mission-item .mission-title {
  color: var(--hud-cyan);
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 1px;
}
#mission-menu .mission-item .mission-location {
  color: var(--hud-grey);
  font-size: 10px;
}
#mission-menu button {
  background: #000;
  color: var(--hud-green);
  border: 1px solid var(--hud-border);
  font-family: var(--font-mono);
  font-size: 12px;
  cursor: pointer;
  padding: 4px 16px;
  letter-spacing: 2px;
  transition: background 0.2s, color 0.2s;
}
#mission-menu button:hover { background: var(--hud-green); color: #000; }

/* ============================================================
   RADAR SWEEP ANIMATION
   ============================================================ */
@keyframes radarSweep {
  0% { opacity: 0.15; transform: rotate(0deg); }
  50% { opacity: 0.3; }
  100% { opacity: 0.15; transform: rotate(360deg); }
}