* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background:
    radial-gradient(circle at top, rgba(132, 87, 255, 0.28), transparent 30%),
    radial-gradient(circle at bottom right, rgba(0, 255, 214, 0.18), transparent 25%),
    linear-gradient(180deg, #120726 0%, #190d35 40%, #0b1225 100%);
  color: #fff;
  font-family: Arial, Helvetica, sans-serif;
}
body {
  min-height: 100vh;
}
.love-app {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px;
}
.hero {
  text-align: center;
  padding: 22px 18px;
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(255,255,255,0.10), rgba(255,255,255,0.04));
  box-shadow: 0 12px 40px rgba(0,0,0,0.28);
  border: 1px solid rgba(255,255,255,0.10);
}
.hero-badge {
  display: inline-block;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255,255,255,0.12);
  font-weight: 700;
  margin-bottom: 10px;
}
.hero h1 {
  margin: 6px 0 10px;
  font-size: clamp(2rem, 4vw, 3.2rem);
}
.hero p {
  max-width: 760px;
  margin: 0 auto;
  line-height: 1.5;
  opacity: 0.95;
}
.controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 16px;
}
.controls label, .controls button {
  border-radius: 14px;
  padding: 10px 14px;
  border: 0;
  font: inherit;
}
.controls label {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.12);
}
.controls button {
  cursor: pointer;
  font-weight: 700;
}
#startBtn {
  background: linear-gradient(90deg, #ff5da8, #9f6bff);
  color: #fff;
}
#restartBtn {
  background: #2c2450;
  color: #fff;
}
.top-panels {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 12px;
  margin-top: 14px;
}
.hud {
  display: grid;
  grid-template-columns: repeat(4, minmax(0,1fr));
  gap: 10px;
}
.hud-card, .message-panel {
  background: rgba(255,255,255,0.08);
  border-radius: 18px;
  padding: 14px;
  border: 1px solid rgba(255,255,255,0.10);
  box-shadow: 0 8px 28px rgba(0,0,0,0.22);
}
.hud-card {
  text-align: center;
  font-weight: 700;
}
.hud-card span {
  display: block;
  margin-top: 6px;
  font-size: 1.2rem;
}
.message-title {
  font-weight: 700;
  margin-bottom: 10px;
}
.message-box {
  min-height: 76px;
  padding: 14px;
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(255,255,255,0.12), rgba(255,255,255,0.06));
  font-size: 1.05rem;
  line-height: 1.5;
}
.game-shell {
  position: relative;
  margin-top: 14px;
  min-height: 72vh;
  border-radius: 24px;
  overflow: hidden;
  padding: 12px;
  background:
    radial-gradient(circle at 50% 0%, rgba(255,255,255,0.08), transparent 35%),
    linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.02));
  border: 1px solid rgba(255,255,255,0.10);
  box-shadow: 0 16px 50px rgba(0,0,0,0.26);
}
.lane-wrap {
  position: absolute;
  inset: 14px 14px 44px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0,1fr));
  gap: 10px;
}
.lane {
  position: relative;
  overflow: hidden;
  border-radius: 22px;
  touch-action: manipulation;
  border: 1px solid rgba(255,255,255,0.12);
}
.lane::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at top, rgba(255,255,255,0.11), transparent 35%),
    linear-gradient(180deg, rgba(255,255,255,0.08), rgba(255,255,255,0.03));
  pointer-events: none;
}
.note {
  position: absolute;
  left: 10%;
  width: 80%;
  height: 22px;
  border-radius: 999px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.30), 0 0 18px rgba(255,255,255,0.12);
}
.hitline {
  position: absolute;
  left: 24px;
  right: 24px;
  bottom: 96px;
  height: 4px;
  border-radius: 999px;
  background: rgba(255,255,255,0.8);
  box-shadow: 0 0 16px rgba(255,255,255,0.35);
}
.tap-flash {
  position: absolute;
  left: 12%;
  width: 76%;
  bottom: 58px;
  height: 48px;
  border-radius: 999px;
  opacity: 0;
  pointer-events: none;
}
.tap-flash.active {
  animation: flash .16s ease-out;
}
@keyframes flash {
  from { opacity: 0.95; transform: scale(1); }
  to { opacity: 0; transform: scale(1.14); }
}
.celebrate {
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%) scale(0.9);
  font-size: 2.6rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity .18s ease, transform .18s ease;
  text-shadow: 0 0 20px rgba(255,255,255,0.35);
}
.celebrate.show {
  opacity: 1;
  transform: translateX(-50%) scale(1.15);
}
.decor {
  position: absolute;
  top: 16px;
  font-size: 1.2rem;
  opacity: 0.55;
  display: flex;
  flex-direction: column;
  gap: 18px;
  pointer-events: none;
}
.decor-left { left: 8px; }
.decor-right { right: 8px; text-align: right; }
.footer-help {
  position: absolute;
  bottom: 12px;
  left: 0;
  right: 0;
  text-align: center;
  opacity: 0.85;
  font-size: 0.95rem;
}
.vibe-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
  justify-content: center;
}
.vibe-strip span {
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(255,255,255,0.09);
  border: 1px solid rgba(255,255,255,0.10);
}
@media (max-width: 860px) {
  .top-panels {
    grid-template-columns: 1fr;
  }
  .hud {
    grid-template-columns: repeat(2, minmax(0,1fr));
  }
  .game-shell {
    min-height: 78vh;
  }
}
@media (max-width: 640px) {
  .love-app {
    padding: 10px;
  }
  .lane-wrap {
    gap: 8px;
  }
  .game-shell {
    min-height: 82vh;
  }
  .hero {
    padding: 18px 14px;
  }
}