/* ============================================
   Element Navigator
   ============================================ */

/* Reset all elements to border-box sizing and remove default margins/padding */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* Main page background and font setup */
body {
  background: #95e7fb;
  color: #ffffff;
  font-family: Arial, Helvetica, sans-serif;
  min-height: 100vh;
}

/* Header bar at the top of the page */
#topbar {
  background: #151a25;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

/* Title text in the header */
.brand {
  font-size: 24px;
  font-weight: bold;
  color: #ffffff;
}

/* Container for the level selection buttons */
#levelTabs {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin: 20px 0;
}

/* Individual level tab button (default state) */
.levelTab {
  background: #ffffff;
  color: #000000;
  border: 1px solid #333;
  padding: 10px 18px;
  cursor: pointer;
}

/* Currently selected level tab */
.levelTab.active {
  background: #ebed6b;
  color: #000000;
}

/* Score display bar below the tabs */
#scoreboard {
  display: block;
  text-align: center;
  margin-bottom: 12px;
  color: #a20101;
}

/* How-to-play instructions text */
#instructions {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 16px;
  color: #000000;
}

/* SVG game board - scales to fit screen width */
#scene {
  width: 100%;
  max-width: 1000px;
  display: block;
  margin: 0 auto;
}

/* Orange dots marking clickable hotspots on the spacecraft images */
.hotspotDot {
  fill: #ff9800;
}

/* Text labels next to each hotspot dot */
.hotspotLabel {
  fill: #ffffff;
  font-size: 13px;
  text-anchor: start;
}

/* Green dot when a hotspot has been correctly matched */
.hotspot.matched .hotspotDot {
  fill: #4df352;
}

/* Red flash when user drops an element on the wrong hotspot */
.hotspot.wrong .hotspotDot {
  fill: #f44336;
}

/* Circular border around each draggable element badge */
.badgeCircle {
  fill: rgba(255, 255, 255, 0.05);
  stroke: #000000;
  stroke-width: 3;
}

/* Chemical symbol text inside each badge (e.g. "Al", "Cu") */
.badgeSymbol {
  fill: #000000;
  font-size: 20px;
  font-weight: bold;
  text-anchor: middle;
}

/* Full material name text below each badge symbol */
.badgeName {
  fill: #ffffff;
  font-size: 11px;
  text-anchor: middle;
}

/* Thicker glow border when user clicks to select a badge */
.badge.selected .badgeCircle {
  stroke-width: 5;
  filter: drop-shadow(0 0 10px #e6f74f);
}

/* Fade out and disable clicks on badges that are already matched */
.badge.matched {
  opacity: 0.3;
  pointer-events: none;
  color: #9deb4e;
}

/* Curved line drawn between a matched badge and its hotspot */
.connectionLine {
  fill: none;
  stroke-width: 3;
  stroke-linecap: round;
}

/* Dashed line that follows the cursor while dragging */
.dragLine {
  stroke-width: 2;
  stroke-dasharray: 6 6;
  opacity: 0.8;
}

/* Toast notification bar at bottom of screen (hidden by default) */
#toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: #000000;
  color: #fff;
  padding: 12px 20px;
  border-radius: 4px;
  opacity: 0;
  transition: opacity 0.2s;
}

/* Show the toast notification */
#toast.show {
  opacity: 1;
}

/* Green left border for correct-match toasts */
#toast.good {
  border-left: 3px solid #4caf50;
}

/* Yellow left border for surprise-fact toasts */
#toast.surprise {
  border-left: 3px solid #ffeb3b;
}

/* Modal overlay background (darkens the page) */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
}

/* Make overlay visible and clickable */
.overlay.show {
  opacity: 1;
  pointer-events: all;
}

/* Centered popup card inside the overlay */
.modal {
  background: #1a1f2e;
  border: 1px solid #333;
  padding: 28px;
  max-width: 460px;
  width: 90%;
  text-align: center;
}

/* Generic button style used in all modals */
.btn {
  background: #fff;
  color: #000;
  border: none;
  padding: 10px 22px;
  cursor: pointer;
  margin-top: 16px;
}

/* Mobile adjustments for screens narrower than 640px */

/* Semi-transparent background pill behind hotspot labels */
.labelBg {
  fill: rgba(0, 0, 0, 0.7);
}

/* Semi-transparent background pill behind badge names */
.badgeNameBg {
  fill: rgba(0, 0, 0, 0.65);
}

/* Badge circle stroke changed to white for contrast on dark bg */
.badgeCircle {
  fill: rgba(255, 255, 255, 0.08);
  stroke: #000000;
  stroke-width: 2.5;
}

@media (max-width: 640px) {
  #topbar {
    flex-direction: column;
    gap: 8px;
    height: auto;
    padding: 12px;
  }
  .levelTab {
    padding: 8px 12px;
    font-size: 12px;
  }
  .brand {
    font-size: 18px;
  }
}

/* Hide all craft levels by default */
.craftLevel {
  display: none;
}

/* Show only the currently active craft level */
.craftLevel.activeLevel {
  display: block;
}

/* Decorative dashed ellipse behind the spacecraft */
.orbitRing {
  fill: #ffffff;
  stroke: rgba(255,255,255,.08);
  stroke-width: 1.5;
  stroke-dasharray: 4 8;
}

/* Reset button in the top-right corner of the header */
#resetBtn {
  margin-left: auto;
  padding: 14px 32px;
  font-size: 15px;
  font-weight: bold;
  background: #ffffff;
  color: #000000;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

/* Background starfield container - fixed behind everything */
#stars {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
}

/* Individual twinkling star divs generated by JS */
.star {
  position: absolute;
  background: white;
  border-radius: 50%;
  opacity: 0.8;
  animation: twinkle 3s infinite ease-in-out;
}

/* Keyframes for the star twinkle opacity animation */
@keyframes twinkle {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

/* Streak counter span injected by game.js into the stats bar */
.streakStat {
  color: #fff;
  margin-left: 16px;
  font-size: 14px;
}

/* Small gray tag line in the fact modal (e.g. "Al · Fuel Tanks & Airframe") */
.factCard .tag {
  color: #888;
  font-size: 12px;
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Large material name heading in the fact modal */
.factCard .ttl {
  font-size: 22px;
  font-weight: bold;
  margin-bottom: 12px;
  color: #fff;
}

/* Body paragraph text in the fact modal */
.factCard .body {
  font-size: 15px;
  line-height: 1.5;
  color: #ccc;
}

/* Individual glossary entry in the win screen */
.glItem {
  text-align: left;
  padding: 8px 0;
  border-bottom: 1px solid #333;
}

/* Glossary entry heading (icon + symbol + name + use) */
.glItem .h {
  font-weight: bold;
  color: #ebed6b;
  margin-bottom: 4px;
}

/* Glossary entry description text */
.glItem .b {
  font-size: 13px;
  color: #aaa;
}