:root {
  --bg: #050816;
  --bg-soft: #0f172a;
  --accent: #22c55e;
  --accent-soft: rgba(34, 197, 94, 0.16);
  --accent-strong: rgba(34, 197, 94, 0.65);
  --danger: #f97373;
  --text: #e5e7eb;
  --text-soft: #9ca3af;
  --border-subtle: rgba(148, 163, 184, 0.4);
  --shadow-soft: 0 24px 50px rgba(15, 23, 42, 0.9);
  --radius-lg: 24px;
  --radius-md: 999px;
  --transition-fast: 160ms ease-out;
  --transition-med: 220ms ease-out;
}

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

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top, #1d4ed8 0, transparent 55%),
    radial-gradient(circle at bottom, #22c55e 0, transparent 55%),
    var(--bg);
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
}

.page {
  width: 100%;
  max-width: 960px;
  padding: 24px;
}

.card {
  background: linear-gradient(145deg, rgba(15, 23, 42, 0.96), rgba(15, 23, 42, 0.92));
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(26px);
  padding: 20px 24px 24px;
  display: grid;
  grid-template-rows: auto auto auto;
  gap: 12px;
}

@media (min-width: 720px) {
  .card {
    padding: 24px 30px 26px;
    grid-template-rows: auto 1fr auto;
  }
}

.card__header {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 4px;
}

.card__title {
  margin: 0;
  font-size: 1.4rem;
  letter-spacing: 0.03em;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.card__title::before {
  content: "";
  width: 9px;
  height: 22px;
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, #4ade80, #22c55e);
  box-shadow:
    0 0 0 4px rgba(74, 222, 128, 0.18),
    0 0 26px rgba(74, 222, 128, 0.65);
}

.card__subtitle {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-soft);
}

.card__body {
  display: grid;
  gap: 14px;
}

@media (min-width: 720px) {
  .card__body {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1.15fr);
    align-items: stretch;
  }
}

.hud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: flex-start;
  padding: 10px 12px;
  border-radius: 18px;
  background: radial-gradient(circle at top left, rgba(34, 197, 94, 0.15), transparent 55%),
    radial-gradient(circle at bottom right, rgba(59, 130, 246, 0.13), transparent 55%),
    rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(51, 65, 85, 0.9);
}

.hud__item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 90px;
}

.hud__label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.11em;
  color: var(--text-soft);
}

.hud__value {
  font-variant-numeric: tabular-nums;
  font-size: 1.2rem;
}

.btn {
  border: none;
  border-radius: 999px;
  padding: 8px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast),
    box-shadow var(--transition-fast),
    transform var(--transition-fast),
    border-color var(--transition-fast);
  white-space: nowrap;
}

.btn--primary {
  background: radial-gradient(circle at 0 0, var(--accent-soft), transparent 60%),
    var(--accent);
  color: #022c22;
  box-shadow:
    0 0 0 1px rgba(22, 163, 74, 0.8),
    0 15px 30px var(--accent-strong);
}

.btn--primary:hover {
  transform: translateY(-1px);
  box-shadow:
    0 0 0 1px rgba(21, 128, 61, 0.95),
    0 18px 36px rgba(34, 197, 94, 0.9);
}

.btn--primary:active {
  transform: translateY(0);
  box-shadow:
    0 0 0 1px rgba(22, 163, 74, 0.9),
    0 4px 14px rgba(21, 128, 61, 0.9);
}

.btn--secondary {
  background: rgba(15, 23, 42, 0.95);
  color: var(--text);
  border: 1px solid rgba(148, 163, 184, 0.8);
  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.9);
}

.btn--secondary:hover {
  transform: translateY(-1px);
  border-color: rgba(209, 213, 219, 0.9);
}

.btn--secondary:active {
  transform: translateY(0);
  box-shadow: 0 3px 10px rgba(15, 23, 42, 0.9);
}

.game-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px;
  border-radius: 22px;
  background:
    radial-gradient(circle at 0 0, rgba(34, 197, 94, 0.16), transparent 55%),
    radial-gradient(circle at 100% 100%, rgba(56, 189, 248, 0.23), transparent 55%),
    #020617;
  border: 1px solid rgba(15, 23, 42, 0.75);
  box-shadow:
    inset 0 0 0 1px rgba(15, 23, 42, 0.95),
    0 24px 45px rgba(15, 23, 42, 0.95);
}

canvas#game {
  width: 100%;
  max-width: 480px;
  aspect-ratio: 1 / 1;
  border-radius: 20px;
  background: radial-gradient(circle at 0 0, rgba(22, 163, 74, 0.14), transparent 60%),
    radial-gradient(circle at 100% 100%, rgba(30, 64, 175, 0.21), transparent 60%),
    #020617;
  box-shadow:
    inset 0 0 0 1px rgba(15, 23, 42, 0.95),
    0 18px 35px rgba(15, 23, 42, 0.95);
}

.overlay {
  position: absolute;
  inset: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at top, rgba(15, 23, 42, 0.8), rgba(15, 23, 42, 0.98));
  border-radius: 18px;
  border: 1px solid rgba(55, 65, 81, 0.9);
  backdrop-filter: blur(8px);
  transition: opacity var(--transition-med), visibility var(--transition-med), transform var(--transition-med);
}

.overlay--hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: scale(0.985);
}

.overlay__content {
  text-align: center;
  padding: 18px 20px;
  max-width: 280px;
}

.overlay__title {
  margin: 0 0 6px;
  font-size: 1.3rem;
}

.overlay__text {
  margin: 0 0 14px;
  font-size: 0.88rem;
  color: var(--text-soft);
}

.card__footer {
  margin-top: 4px;
}

.hint {
  margin: 0;
  font-size: 0.78rem;
  color: var(--text-soft);
  text-align: center;
}

@media (max-width: 480px) {
  .page {
    padding: 16px;
  }

  .card {
    padding: 16px 16px 18px;
    border-radius: 18px;
  }

  .game-wrapper {
    padding: 8px;
  }

  .overlay {
    inset: 8px;
  }
}