:root {
  --bg: #0b1220;
  --ink: #dce7ff;
  --muted: #93a4c3;
  --accent: #4de0ff;
  --accent-2: #5df29b;
  --panel: #121a2b;
  --panel-2: #0f1626;
  --ghost: #1a2438;
  --warning: #ffcc00;
  --danger: #ff6b6b;
  --success: #5df29b;
  --tile-size: 120px;
  --gap: 10px;
}

* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  background: radial-gradient(
      1000px 600px at 100% -200px,
      rgba(77, 224, 255, 0.08),
      transparent 70%
    ),
    radial-gradient(
      800px 500px at -200px 120%,
      rgba(93, 242, 155, 0.08),
      transparent 70%
    ),
    var(--bg);
  color: var(--ink);
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco,
    Consolas, "Liberation Mono", "Courier New", monospace;
  line-height: 1.6;
  user-select: none;
}

.scanline {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 100% 3px;
  mix-blend-mode: overlay;
}

.hero {
  /* extra top padding to add space above the title */
  padding: 96px 20px 24px;
  background: linear-gradient(
    180deg,
    rgba(77, 224, 255, 0.08),
    transparent 60%
  );
  position: relative;
  overflow: hidden;
}
.hero-inner {
  max-width: 1100px;
  margin: 0 auto;
}
.title {
  font-family: "Oswald", Impact, Haettenschweiler, "Arial Narrow Bold",
    sans-serif;
  font-size: 48px;
  line-height: 1.05;
  margin: 0 0 8px;
}
.subtitle {
  display: block;
  color: var(--accent);
  font-size: 18px;
  font-weight: 400;
  letter-spacing: 0.5px;
}
.lede {
  color: var(--muted);
  max-width: 820px;
  margin: 12px 0 20px;
}

/* Authentic Airline Ticket Design - tuned to Delta reference */
.airline-ticket {
  /* container mimics ~270-280px tall ticket with large radius */
  margin-top: 20px;
  background: #f8f8f8;
  border: 1px solid #d9dde3;
  border-radius: 18px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7),
    0 6px 18px rgba(0, 0, 0, 0.18);
  overflow: hidden;
  position: relative;
  font-family: "Courier New", ui-monospace, monospace;
  color: #222;
}

/* Two horizontal stubs, left 65% / right 35% */
.ticket-stub {
  background: #fff;
  padding: 14px 18px 12px;
  position: relative;
  border-bottom: 1px solid #edf0f3;
}

.ticket-stub:last-of-type {
  border-bottom: none;
}

.ticket-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.flight-label {
  font-size: 10px;
  color: #6b6f73; /* muted gray from reference */
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.flight-number {
  font-size: 12px;
  font-weight: 700;
  color: #222;
  letter-spacing: 0.03em;
}

.route-info {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 6px;
}

.route-label {
  font-size: 10px;
  color: #6b6f73;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.route {
  font-size: 12px;
  font-weight: bold;
  color: #333;
}

.passenger-info {
  margin-bottom: 10px;
}

.passenger-label {
  font-size: 10px;
  color: #6b6f73;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  display: block;
}

.passenger-name {
  font-size: 15px;
  font-weight: 700;
  color: #222;
  margin-top: 2px;
}

/* Left stub row: GATE (large), DEPARTURE (time large + small date), BOARDING ZONE (medium) */
.flight-details {
  display: grid;
  grid-template-columns: 1fr 1.2fr 1fr;
  align-items: end;
  gap: 12px;
  margin-bottom: 12px;
}

/* Right stub row: SEAT (large) and DEPARTURE (large) */
.flight-details-right {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: end;
  gap: 14px;
  margin-bottom: 10px;
}

.gate-section,
.departure-section,
.boarding-section,
.seat-section {
  text-align: left;
}

.label {
  font-size: 9px;
  color: #6b6f73;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  display: block;
}

.value {
  font-size: 28px; /* large numerals like A22 / 3:15 */
  line-height: 1;
  font-weight: 700;
  color: #111;
  margin-top: 2px;
}
.boarding-section .value {
  font-size: 20px;
}
.seat-section .value {
  font-size: 28px;
}
.departure-section .value {
  font-size: 28px;
}
.date {
  font-size: 10px;
  color: #6b6f73;
  margin-top: 2px;
  letter-spacing: 0.03em;
}

/* Bottom line: TRACKING / DATA / OPTIONS (with barcode under OPTIONS) */
.ticket-footer {
  display: grid;
  grid-template-columns: 1.2fr auto;
  align-items: center;
  font-size: 10px;
  color: #6b6f73;
  gap: 10px;
}

.tracking {
  font-family: "Courier New", monospace;
  letter-spacing: 0.08em;
  color: #444;
}

.barcode-section {
  display: flex;
  align-items: center;
  gap: 10px;
}

.barcode {
  width: 120px;
  height: 28px;
  background: repeating-linear-gradient(
    90deg,
    #000 0px,
    #000 1px,
    #fff 1px,
    #fff 2px,
    #000 2px,
    #000 4px,
    #fff 4px,
    #fff 6px
  );
  border: 1px solid #222;
}

.class {
  font-size: 10px;
  font-weight: 700;
  color: #222;
  letter-spacing: 0.06em;
}

/* Perforated separation line (horizontal strip) */
.perforation {
  height: 1px;
  background: repeating-linear-gradient(
    90deg,
    #cfd5db 0px,
    #cfd5db 4px,
    transparent 4px,
    transparent 8px
  );
  margin: 0 18px;
  position: relative;
}

.perforation::before,
.perforation::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  background: #f8f8f8;
  border: 1px solid #d9dde3;
  border-radius: 50%;
  top: -7px;
}

.perforation::before {
  left: -6px;
}

.perforation::after {
  right: -6px;
}

/* Router Airways branding strip - Delta-like deep navy bar ~54px tall */
.airline-branding {
  background: #0e2b4a;
  color: #fff;
  height: 54px;
  padding: 0 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.06em;
}

.brand-left,
.brand-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.triangle {
  color: #f4b51e; /* golden accent */
  font-size: 18px;
}

.airline-name {
  font-family: "Oswald", sans-serif;
  font-weight: 600;
}

/* Paper texture effect */
.airline-ticket::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(
    circle at 1px 1px,
    rgba(0, 0, 0, 0.035) 1px,
    transparent 0
  );
  background-size: 20px 20px;
  pointer-events: none;
  opacity: 0.35;
}

.ticker {
  /* Place ticker in normal flow below ticket and above game */
  position: relative;
  left: auto;
  right: auto;
  top: auto;
  margin-top: 12px;
  padding: 10px 20px;
  background: rgba(10, 16, 30, 0.7);
  border: 1px solid #1c2740;
  border-radius: 10px;
  display: flex;
  gap: 40px;
  white-space: nowrap;
  overflow: hidden;
}
.ticker span {
  animation: scroll 18s linear infinite;
  display: inline-block;
  min-width: max-content;
  color: #a9b7d6;
}
@keyframes scroll {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-100%);
  }
}

main {
  max-width: 1200px;
  margin: 24px auto;
  padding: 0 20px;
}
.panel {
  background: var(--panel);
  border: 1px solid #1a2743;
  border-radius: 14px;
  padding: 20px;
  margin-bottom: 20px;
}
.panel.contrast {
  background: var(--panel-2);
}

/* Game Controls */
.game-controls {
  display: flex;
  gap: 16px;
  align-items: center;
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.difficulty-selector {
  display: flex;
  align-items: center;
  gap: 8px;
}
.difficulty-selector label {
  color: var(--muted);
  font-size: 14px;
}
.difficulty-selector select {
  background: var(--ghost);
  color: var(--ink);
  border: 1px solid #223052;
  padding: 8px 12px;
  border-radius: 6px;
  font-family: inherit;
}

.btn {
  background: var(--ghost);
  color: var(--ink);
  border: 1px solid #223052;
  padding: 10px 16px;
  border-radius: 8px;
  cursor: pointer;
  transition: 0.2s transform, 0.2s background;
  font-family: inherit;
  font-size: 14px;
}
.btn:hover {
  transform: translateY(-1px);
  background: #223052;
}
.btn.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #001019;
  border: none;
}
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* Game Stats */
.game-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}
.stat {
  background: #0d1628;
  border: 1px solid #21365d;
  border-radius: 8px;
  padding: 12px;
  text-align: center;
}
.stat-label {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 4px;
}
.stat-value {
  font-size: 18px;
  font-weight: 700;
  color: var(--accent-2);
}

/* Game Board */
.game-board {
  position: relative;
  min-height: 400px;
  background: #0c1426;
  border: 2px solid #263a63;
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 20px;
  overflow: hidden;
}

/* Tiles */
.tile {
  position: absolute;
  width: var(--tile-size);
  height: var(--tile-size);
  background: #0d1628;
  border: 2px solid #21365d;
  border-radius: 12px;
  overflow: hidden;
  cursor: grab;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  z-index: 1;
}

.tile:active {
  cursor: grabbing;
}

.tile.dragging {
  z-index: 1000;
  transform: scale(1.05) rotate(2deg);
  box-shadow: 0 8px 24px rgba(77, 224, 255, 0.3);
  border-color: var(--accent);
}

.tile.matched {
  opacity: 0;
  transform: scale(0.8);
  pointer-events: none;
  transition: all 0.5s ease;
}

.tile.highlight {
  border-color: var(--success);
  box-shadow: 0 0 0 3px rgba(93, 242, 155, 0.3);
}

.tile img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  pointer-events: none;
}

/* Drop zones for collision detection */
.drop-zone {
  position: absolute;
  width: calc(var(--tile-size) + 20px);
  height: calc(var(--tile-size) + 20px);
  border: 2px dashed transparent;
  border-radius: 12px;
  transition: border-color 0.2s ease;
  pointer-events: none;
}

.drop-zone.active {
  border-color: var(--accent);
  background: rgba(77, 224, 255, 0.1);
}

/* Toast notifications */
.toast {
  margin-top: 12px;
  background: rgba(12, 20, 38, 0.95);
  border: 1px solid #314a79;
  border-radius: 10px;
  padding: 12px 16px;
  color: #bcd3ff;
  text-align: center;
  opacity: 0;
  transition: opacity 0.3s ease;
  font-weight: 500;
}
.toast.show {
  opacity: 1;
}
.toast.success {
  border-color: var(--success);
  color: var(--success);
}
.toast.warning {
  border-color: var(--warning);
  color: var(--warning);
}

/* Instructions */
.instructions {
  list-style: none;
  margin: 0;
  padding: 0;
}
.instructions li {
  padding: 8px 0;
  border-bottom: 1px solid #1a2743;
  color: var(--muted);
}
.instructions li:last-child {
  border-bottom: none;
}
.instructions li:before {
  content: counter(step-counter);
  counter-increment: step-counter;
  background: var(--accent);
  color: #001019;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  margin-right: 12px;
}
.instructions {
  counter-reset: step-counter;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 24px 20px;
  color: #8192b6;
}
.small {
  color: #9ab0da;
  text-decoration: none;
  border-bottom: 1px dotted #39507c;
}
.small:hover {
  color: #cfe2ff;
}

/* Responsive Design */
@media (max-width: 768px) {
  :root {
    --tile-size: 100px;
  }
  .title {
    font-size: 36px;
  }
  .game-controls {
    justify-content: center;
  }
  .game-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero {
    padding: 40px 20px 20px;
  }
}

@media (max-width: 480px) {
  :root {
    --tile-size: 80px;
  }
  .game-board {
    padding: 15px;
    min-height: 300px;
  }
  .boarding-pass {
    flex-direction: column;
    text-align: center;
  }
  .bp-right {
    text-align: center;
    margin-top: 8px;
  }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
  .tile {
    border-width: 3px;
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.4);
  }
  .tile.dragging {
    transform: scale(1.1);
  }
  .btn {
    padding: 12px 20px;
    font-size: 16px;
  }
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes matchSuccess {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.2);
    border-color: var(--success);
  }
  100% {
    transform: scale(0.8);
    opacity: 0;
  }
}

.tile.match-animation {
  animation: matchSuccess 0.6s ease forwards;
}

/* Game states */
.game-board.game-over {
  border-color: var(--success);
  box-shadow: 0 0 0 3px rgba(93, 242, 155, 0.2);
}

.game-board.game-over::after {
  content: "🎉 Congratulations! 🎉";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 24px;
  color: var(--success);
  font-weight: 700;
  text-align: center;
  background: rgba(12, 20, 38, 0.95);
  padding: 20px 30px;
  border-radius: 12px;
  border: 2px solid var(--success);
}

/* Animated Quote Popup */
.quote-popup {
  position: absolute;
  z-index: 2000;
  background: rgba(11, 18, 32, 0.95);
  border: 2px solid var(--accent);
  border-radius: 16px;
  padding: 24px 32px;
  max-width: 400px;
  text-align: center;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.6), 0 0 20px rgba(77, 224, 255, 0.3);
  backdrop-filter: blur(8px);
  animation: popupFadeIn 0.5s ease-out forwards;
  pointer-events: none;
}

.quote-popup.fade-out {
  animation: popupFadeOut 0.5s ease-in forwards;
}

.quote-text {
  font-size: 18px;
  color: var(--ink);
  font-weight: 500;
  line-height: 1.4;
  margin-bottom: 12px;
  min-height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-shadow: 0 0 10px rgba(77, 224, 255, 0.5);
}

.quote-text.glow-complete {
  animation: textGlow 1s ease-in-out;
}

.quote-points {
  font-size: 16px;
  color: var(--accent-2);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  opacity: 0;
  animation: pointsFadeIn 0.3s ease-out 1.5s forwards;
}

/* Typewriter cursor effect */
.quote-text::after {
  content: "|";
  color: var(--accent);
  animation: blink 1s infinite;
  margin-left: 2px;
}

.quote-text.glow-complete::after {
  display: none;
}

/* Animations */
@keyframes popupFadeIn {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.8) rotateY(90deg);
  }
  100% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1) rotateY(0deg);
  }
}

@keyframes popupFadeOut {
  0% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.9);
  }
}

@keyframes textGlow {
  0% {
    text-shadow: 0 0 10px rgba(77, 224, 255, 0.5);
  }
  50% {
    text-shadow: 0 0 20px rgba(77, 224, 255, 0.8),
      0 0 30px rgba(77, 224, 255, 0.6);
  }
  100% {
    text-shadow: 0 0 10px rgba(77, 224, 255, 0.5);
  }
}

@keyframes pointsFadeIn {
  0% {
    opacity: 0;
    transform: translateY(10px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes blink {
  0%,
  50% {
    opacity: 1;
  }
  51%,
  100% {
    opacity: 0;
  }
}

/* Mobile optimizations for quote popup */
@media (max-width: 480px) {
  .quote-popup {
    max-width: 300px;
    padding: 20px 24px;
  }

  .quote-text {
    font-size: 16px;
    min-height: 40px;
  }

  .quote-points {
    font-size: 14px;
  }
}