*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --bg-top: #121a2f;
  --bg-bottom: #0a0f1c;
  --card: rgba(255, 255, 255, 0.08);
  --card-border: rgba(255, 255, 255, 0.16);
  --text: #f5f8ff;
  --muted: #bfc8df;
  --green: #2ee59d;
  --red: #ff6262;
  --blue: #6ca9ff;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: Arial, Helvetica, sans-serif;
  background: linear-gradient(160deg, var(--bg-top), var(--bg-bottom));
  color: var(--text);
}

body {
  display: grid;
  place-items: center;
  padding: 1rem;
}

.app {
  width: min(720px, 100%);
}

.game-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 1rem;
  backdrop-filter: blur(6px);
  box-shadow: 0 18px 32px rgba(0, 0, 0, 0.25);
}

h1 {
  margin: 0 0 1rem;
  text-align: center;
  font-size: clamp(1.3rem, 3.2vw, 2rem);
}

.status-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.5rem;
  margin-bottom: 0.9rem;
}

.status-item {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 12px;
  padding: 0.6rem;
  text-align: center;
}

.label {
  display: block;
  font-size: 0.75rem;
  color: var(--muted);
  margin-bottom: 0.2rem;
}

.value {
  font-weight: 700;
  font-size: clamp(0.95rem, 2vw, 1.1rem);
}

.state-running {
  color: var(--green);
}

.state-stopped {
  color: var(--red);
}

.state-idle {
  color: var(--blue);
}

.game-area {
  position: relative;
  height: clamp(180px, 36vh, 280px);
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background:
    radial-gradient(circle at 20% 30%, rgba(108, 169, 255, 0.25), transparent 45%),
    linear-gradient(
      to right,
      rgba(255, 255, 255, 0.06) 0,
      rgba(255, 255, 255, 0.06) 2px,
      transparent 2px,
      transparent 34px
    ),
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(0, 0, 0, 0.18));
  overflow: hidden;
}

.game-area::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 26%;
  height: 3px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.35), transparent);
}

.runner {
  position: absolute;
  width: clamp(28px, 6vw, 42px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #ffffff, #6ca9ff 58%, #3062ba 100%);
  box-shadow: 0 8px 18px rgba(108, 169, 255, 0.45);
  transform: translate3d(0, 0, 0);
  bottom: 26%;
}

.runner.runner-stopped {
  animation: stopPulse 420ms ease-out forwards;
}

@keyframes stopPulse {
  0% {
    transform: translate3d(var(--x, 0), 0, 0) scale(1);
  }
  45% {
    transform: translate3d(var(--x, 0), -6px, 0) scale(1.12);
  }
  100% {
    transform: translate3d(var(--x, 0), 0, 0) scale(0.95);
  }
}

.result {
  margin: 0.8rem 0 1rem;
  text-align: center;
  font-weight: 700;
  color: var(--muted);
}

.controls {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.5rem;
}

.btn {
  appearance: none;
  border: none;
  border-radius: 12px;
  min-height: 46px;
  padding: 0.7rem 0.8rem;
  font-size: 0.98rem;
  font-weight: 700;
  color: #f7f9ff;
  cursor: pointer;
  touch-action: manipulation;
  transition: transform 140ms ease, opacity 140ms ease, filter 140ms ease;
}

.btn:active {
  transform: translateY(1px) scale(0.99);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  filter: grayscale(0.2);
}

.btn-start {
  background: linear-gradient(135deg, #2ddf9b, #10a56f);
}

.btn-stop {
  background: linear-gradient(135deg, #ff6d6d, #c43838);
}

.btn-restart {
  background: linear-gradient(135deg, #7ca9ff, #3d66c7);
}

@media (max-width: 520px) {
  .status-grid,
  .controls {
    grid-template-columns: 1fr;
  }

  .btn {
    min-height: 52px;
  }
}