@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;600;800&family=Space+Grotesk:wght@400;600;700&display=swap');

:root {
  --bg-deep: #050609;
  --bg-mid: #0b0f16;
  --ink: #e8f3ff;
  --muted: #9fb2c8;
  --teal: #52f2d5;
  --amber: #ffb347;
  --hot: #ff6b5c;
  --violet: #c07bff;
}

* { box-sizing: border-box; }

html, body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  background: radial-gradient(1200px 800px at 50% -200px, #16202d 0%, var(--bg-mid) 55%, var(--bg-deep) 100%);
  font-family: 'Space Grotesk', system-ui, sans-serif;
  color: var(--ink);
}

canvas {
  position: fixed;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
}

#bootmsg {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}
#bootmsg.fail {
  color: var(--hot);
  letter-spacing: 0.06em;
  text-transform: none;
  font-size: 1rem;
}

#ui {
  position: fixed;
  inset: 0;
  z-index: 10;
  pointer-events: none;
}

/* ---------- HUD ---------- */
.stat { display: flex; flex-direction: column; gap: 3px; }
.stat .label { font-size: 0.6rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--muted); }
.stat .value { font-size: 1rem; font-weight: 600; }
.stat .value.big {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.55rem;
  font-weight: 700;
  text-shadow: 0 0 18px rgba(82, 242, 213, 0.35);
}

#hud {
  position: absolute;
  top: 18px;
  left: 18px;
  display: flex;
  gap: 18px;
  padding: 12px 16px;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(8, 12, 18, 0.55);
  backdrop-filter: blur(6px);
}

#comboWrap .value { color: var(--muted); font-family: 'Orbitron', sans-serif; }
#comboWrap.active .value { color: var(--violet); text-shadow: 0 0 14px rgba(192, 123, 255, 0.5); }

#hudRight {
  position: absolute;
  top: 18px;
  right: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: flex-end;
  padding: 12px 16px;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(8, 12, 18, 0.55);
  backdrop-filter: blur(6px);
}
#hudRight .value { font-family: 'Orbitron', sans-serif; }
#audioChip { font-size: 0.62rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); opacity: 0.85; }

/* ---------- Flow meter ---------- */
#flowWrap {
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  width: min(220px, 42vw);
}
.flowTop { display: flex; justify-content: space-between; margin-bottom: 5px; }
.flowLabel { font-size: 0.6rem; letter-spacing: 0.22em; text-transform: uppercase; color: var(--muted); }
#mult { font-size: 0.72rem; font-family: 'Orbitron', sans-serif; color: var(--teal); }
#flowBar { height: 5px; border-radius: 999px; background: rgba(255, 255, 255, 0.09); overflow: hidden; }
#flowFill {
  height: 100%;
  width: 0%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--teal), var(--amber));
  transition: width 0.15s ease;
}
body.surging #flowFill { background: linear-gradient(90deg, var(--amber), var(--hot)); }

#surgeBanner {
  position: absolute;
  top: 64px;
  left: 50%;
  transform: translateX(-50%);
  font-family: 'Orbitron', sans-serif;
  font-size: 1.05rem;
  letter-spacing: 0.3em;
  color: var(--hot);
  text-shadow: 0 0 18px rgba(255, 107, 92, 0.7);
  opacity: 0;
  transition: opacity 0.3s ease;
}
#surgeBanner.visible { opacity: 1; animation: surgePulse 0.5s ease-in-out infinite alternate; }
@keyframes surgePulse {
  from { transform: translateX(-50%) scale(1); }
  to { transform: translateX(-50%) scale(1.07); }
}

/* ---------- Beat dots ---------- */
#dots {
  position: absolute;
  bottom: 26px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
}
#dots span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.16);
  transition: transform 0.12s ease, background 0.12s ease, box-shadow 0.12s ease;
}
#dots span.on {
  transform: scale(1.7);
  background: var(--teal);
  box-shadow: 0 0 12px rgba(82, 242, 213, 0.9);
}

/* ---------- Quote + hint ---------- */
#quote {
  position: absolute;
  bottom: 56px;
  left: 50%;
  transform: translate(-50%, 10px);
  padding: 9px 16px;
  border-radius: 14px;
  border: 1px solid rgba(255, 179, 71, 0.3);
  background: rgba(6, 10, 14, 0.62);
  max-width: 84%;
  text-align: center;
  font-size: 0.95rem;
  opacity: 0;
  transition: opacity 0.5s ease, transform 0.5s ease;
}
#quote.show { opacity: 1; transform: translate(-50%, 0); }

#hint {
  position: absolute;
  bottom: 104px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  opacity: 0;
  transition: opacity 0.6s ease;
}
#hint.show { opacity: 0.9; }

/* ---------- Popups ---------- */
#popups { position: absolute; inset: 0; overflow: hidden; }
.pop {
  position: absolute;
  transform: translate(-50%, -50%) scale(0.55);
  font-family: 'Orbitron', sans-serif;
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: transform 0.45s cubic-bezier(0.2, 0.9, 0.3, 1.4), opacity 0.45s ease;
}
.pop.go { opacity: 1; transform: translate(-50%, -170%) scale(1); }
.pop.fade { opacity: 0; transform: translate(-50%, -230%) scale(0.95); transition: transform 0.4s ease, opacity 0.4s ease; }
.pop--onbeat { color: var(--teal); text-shadow: 0 0 14px rgba(82, 242, 213, 0.8); }
.pop--close { color: var(--amber); text-shadow: 0 0 14px rgba(255, 179, 71, 0.8); }
.pop--orb { color: var(--amber); text-shadow: 0 0 12px rgba(255, 179, 71, 0.7); font-size: 0.85rem; }
.pop--shard { color: var(--teal); text-shadow: 0 0 12px rgba(55, 230, 255, 0.75); font-size: 0.85rem; }
.pop--shield { color: var(--violet); text-shadow: 0 0 14px rgba(192, 123, 255, 0.8); }
.pop--combo { color: var(--violet); font-size: 1.25rem; letter-spacing: 0.18em; text-shadow: 0 0 20px rgba(192, 123, 255, 0.85); }
.pop--surge { color: var(--hot); font-size: 1.5rem; letter-spacing: 0.3em; text-shadow: 0 0 24px rgba(255, 107, 92, 0.9); }

/* ---------- Surge / crash overlays ---------- */
#surgeGlow {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.5s ease;
  box-shadow: inset 0 0 180px rgba(255, 120, 80, 0.22), inset 0 0 60px rgba(255, 179, 71, 0.12);
}
body.surging #surgeGlow { opacity: 1; }

#flash {
  position: absolute;
  inset: 0;
  opacity: 0;
  background: radial-gradient(circle at 50% 60%, rgba(255, 90, 70, 0.5), rgba(255, 60, 40, 0.18) 70%);
}

/* ---------- Overlays ---------- */
.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(900px 600px at 50% 0%, rgba(16, 24, 36, 0.88), rgba(6, 8, 12, 0.94));
  backdrop-filter: blur(4px);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.45s ease;
}
.overlay.visible { opacity: 1; pointer-events: auto; }

.card {
  max-width: 520px;
  margin: 0 16px;
  padding: 28px 32px;
  border-radius: 24px;
  border: 1px solid rgba(82, 242, 213, 0.25);
  background: rgba(7, 10, 16, 0.85);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
  text-align: center;
}
.card h1 {
  margin: 0 0 10px;
  font-family: 'Orbitron', sans-serif;
  font-size: 3rem;
  letter-spacing: 0.12em;
  color: var(--teal);
  text-shadow: 0 0 22px rgba(82, 242, 213, 0.4);
}
.card .sub { margin: 0 0 14px; color: var(--muted); font-size: 0.95rem; line-height: 1.5; }

.chipRow { display: flex; gap: 8px; justify-content: center; margin: 0 0 16px; }
.chip {
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(12, 16, 24, 0.7);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin: 0 0 18px;
  font-size: 0.88rem;
  color: #c5d3e0;
}
.controls div {
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  background: rgba(12, 16, 24, 0.7);
}

.button {
  display: inline-block;
  border: none;
  padding: 13px 26px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--teal), var(--amber));
  color: #0b0f14;
  font-weight: 700;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.95rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.button:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(82, 242, 213, 0.35); }
.button.ghost {
  background: transparent;
  color: var(--teal);
  border: 1px solid rgba(82, 242, 213, 0.4);
  margin-left: 8px;
}
.button.ghost:hover { box-shadow: 0 12px 26px rgba(82, 242, 213, 0.18); }

.small { font-size: 0.68rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); margin-top: 12px; }

/* ---------- Game over ---------- */
#overGrade {
  font-family: 'Orbitron', sans-serif;
  font-size: 4.2rem;
  font-weight: 800;
  line-height: 1;
  margin: 4px 0 14px;
}
.grade-S { color: var(--hot); text-shadow: 0 0 34px rgba(255, 107, 92, 0.8); }
.grade-A { color: var(--teal); text-shadow: 0 0 30px rgba(82, 242, 213, 0.8); }
.grade-B { color: var(--amber); text-shadow: 0 0 26px rgba(255, 179, 71, 0.7); }
.grade-C { color: #9fd8ff; text-shadow: 0 0 22px rgba(159, 216, 255, 0.6); }
.grade-D { color: var(--muted); }

.overGrid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; margin: 0 0 20px; }
.ostat { padding: 10px; border-radius: 14px; border: 1px solid rgba(255, 255, 255, 0.06); background: rgba(12, 16, 24, 0.7); }
.ostat .label { display: block; font-size: 0.58rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--muted); margin-bottom: 4px; }
.ostat .num { font-family: 'Orbitron', sans-serif; font-size: 1rem; font-weight: 700; }

/* ---------- Mobile ---------- */
@media (max-width: 720px) {
  #hud { flex-direction: column; gap: 8px; padding: 10px 12px; }
  #hudRight { padding: 10px 12px; }
  .stat .value.big { font-size: 1.2rem; }
  .card { padding: 22px; }
  .card h1 { font-size: 2.3rem; }
  #overGrade { font-size: 3.4rem; }
  .controls { grid-template-columns: 1fr; }
  #quote { font-size: 0.88rem; bottom: 48px; }
  #dots { bottom: 20px; }
  #hint { bottom: 92px; }
}