:root {
  --bg-top: #0f172a;
  --bg-bottom: #071033;
  --glass: rgba(255, 255, 255, 0.06);
  --accent: #00e0a8;
  --card: rgba(255, 255, 255, 0.04);
  --muted: #9aa4b2;
  --pill: #0ea5a8;
}

/* Reset & layout */
* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
  margin: 0;
  font-family: Inter, Segoe UI, Roboto, system-ui, -apple-system;
}
body {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  background: linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
  color: #e6eef6;
  padding: 18px;
}

/* Top bar */
.topbar {
  width: 100%;
  max-width: 980px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.6px;
}
.brand .accent {
  color: var(--accent);
}
.controls {
  display: flex;
  align-items: center;
  gap: 10px;
}
.btn {
  background: var(--glass);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 8px 12px;
  border-radius: 10px;
  color: inherit;
  cursor: pointer;
  font-weight: 600;
  backdrop-filter: blur(6px);
}
.scorewrap {
  font-weight: 700;
  padding: 6px 10px;
  border-radius: 10px;
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.03),
    rgba(255, 255, 255, 0.01)
  );
}

/* Game area */
.game-wrap {
  width: 420px;
  max-width: 92vw;
  position: relative;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 10px 40px rgba(2, 6, 23, 0.5);
}
canvas {
  display: block;
  width: 100%;
  height: auto;
  background: linear-gradient(180deg, #1a1a2e, #16213e);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(0, 224, 168, 0.15) 0px,
    rgba(0, 224, 168, 0.5) 2px,
    transparent 2px,
    transparent 30px
  );
  background-size: 300px 100%;
  animation: neonColumns 3s linear infinite;
  box-shadow: 0 0 20px rgba(0, 255, 180, 0.4);
}

@keyframes neonColumns {
  0% {
    background-position: 0 0;
  }
  100% {
    background-position: 300px 0;
  }
}

/* overlay message */
.overlay {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: 18px;
  background: linear-gradient(90deg, rgba(0, 0, 0, 0.45), rgba(0, 0, 0, 0.25));
  padding: 10px 14px;
  border-radius: 12px;
  font-weight: 700;
  color: #fff;
  pointer-events: none;
  backdrop-filter: blur(6px);
}

/* Modal shop */
.modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(rgba(2, 6, 23, 0.55), rgba(2, 6, 23, 0.6));
  z-index: 1000;
}
.hidden {
  display: none;
}
.modal-card {
  width: 92%;
  max-width: 640px;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.03),
    rgba(255, 255, 255, 0.02)
  );
  border-radius: 12px;
  padding: 14px;
  box-shadow: 0 20px 50px rgba(2, 6, 23, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.04);
}
.modal-card header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}
.modal-card h2 {
  margin: 0;
  font-size: 18px;
}
.icon-btn {
  background: transparent;
  border: none;
  color: inherit;
  font-size: 18px;
  cursor: pointer;
}
.duck-grid {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  padding: 8px;
}
.duck-item {
  width: 140px;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.02),
    rgba(255, 255, 255, 0.01)
  );
  border-radius: 8px;
  padding: 8px;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.03);
  cursor: pointer;
  transition: transform 0.16s, box-shadow 0.16s;
}
.duck-item:hover {
  transform: translateY(-6px);
  box-shadow: 0 14px 30px rgba(2, 6, 23, 0.45);
}
.duck-item.selected {
  outline: 2px solid var(--accent);
  box-shadow: 0 12px 28px rgba(0, 224, 168, 0.06);
}

.duck-item img {
  width: 100%;
  height: 90px;
  object-fit: contain;
}
.duck-item p {
  margin: 8px 0 0 0;
  font-weight: 700;
}

/* small screens */
@media (max-width: 520px) {
  .duck-item {
    width: 48%;
  }
  .brand {
    font-size: 16px;
  }
}
.credit {
  position: fixed;
  bottom: 6px;
  right: 10px;
  font-size: 13px;
  color: #9aa4b2;
  opacity: 0.8;
  font-weight: 500;
  font-family: Inter, sans-serif;
}
.credit span {
  color: var(--accent);
  font-weight: 600;
}