:root {
  --bg: #0b1020;
  --card: rgba(255, 255, 255, 0.06);
  --card-border: rgba(255, 255, 255, 0.12);
  --text: rgba(255, 255, 255, 0.92);
  --muted: rgba(255, 255, 255, 0.65);
  --accent: #7c5cff;
  --accent-2: #34d399;
  --danger: #fb7185;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: radial-gradient(1200px 600px at 20% 0%, rgba(124, 92, 255, 0.35), transparent 60%),
              radial-gradient(900px 500px at 80% 20%, rgba(52, 211, 153, 0.25), transparent 55%),
              var(--bg);
  color: var(--text);
}

.app {
  min-height: 100%;
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.header {
  width: min(920px, 100%);
  padding: 10px 4px;
}

.header h1 {
  margin: 0;
  font-size: 32px;
  letter-spacing: -0.03em;
}

.header p {
  margin: 6px 0 0;
  color: var(--muted);
}

.screen {
  width: min(920px, 100%);
  display: none;
}

.screen--active {
  display: block;
}

.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 18px;
  backdrop-filter: blur(10px);
}

.label {
  display: block;
  margin: 14px 0 6px;
  font-size: 13px;
  color: var(--muted);
}

.input {
  width: 100%;
  padding: 12px 12px;
  border-radius: 12px;
  border: 1px solid var(--card-border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  font-size: 16px;
  outline: none;
}

.input:focus {
  border-color: rgba(124, 92, 255, 0.55);
  box-shadow: 0 0 0 4px rgba(124, 92, 255, 0.18);
}

.btn {
  width: 100%;
  margin-top: 14px;
  padding: 12px 12px;
  border-radius: 12px;
  border: 1px solid var(--card-border);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  font-size: 16px;
  cursor: pointer;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn--primary {
  border-color: rgba(124, 92, 255, 0.65);
  background: linear-gradient(135deg, rgba(124, 92, 255, 0.85), rgba(124, 92, 255, 0.45));
}

.muted { color: var(--muted); }
.error { color: var(--danger); margin: 10px 0 0; min-height: 20px; }
.status { margin-top: 12px; color: var(--muted); min-height: 22px; }
.big { font-size: 18px; margin: 10px 0 0; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 12px; }
.row .btn { margin-top: 0; }

.hud {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
}

.hud__item {
  flex: 1;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 12px 14px;
}

.hud__label { color: var(--muted); font-size: 12px; }
.hud__value { font-size: 22px; margin-top: 4px; }

.playfield {
  position: relative;
  height: min(70vh, 560px);
  border-radius: 18px;
  background: radial-gradient(600px 400px at 30% 30%, rgba(255, 255, 255, 0.08), transparent 60%),
              rgba(255, 255, 255, 0.03);
  border: 1px solid var(--card-border);
  overflow: hidden;
  touch-action: manipulation;
}

.bubble {
  position: absolute;
  border-radius: 999px;
  transform: scale(0.2);
  opacity: 0.0;
  background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.85), rgba(255, 255, 255, 0.15) 55%, rgba(124, 92, 255, 0.55));
  border: 1px solid rgba(255, 255, 255, 0.35);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  transition: transform 120ms ease, opacity 120ms ease;
}

.bubble--live {
  transform: scale(1);
  opacity: 1;
}

.bubble--pop {
  transform: scale(1.25);
  opacity: 0;
}

.srOnly {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 520px) {
  .row { grid-template-columns: 1fr; }
  .header h1 { font-size: 28px; }
}