:root {
  color-scheme: dark;
  --bg: #030611;
  --panel: rgba(9, 16, 35, 0.78);
  --panel-strong: rgba(12, 22, 46, 0.92);
  --text: #eef6ff;
  --muted: #9fb3ca;
  --cyan: #61f2ff;
  --gold: #ffd166;
  --rose: #ff6b8a;
  --green: #76f7b7;
  --line: rgba(161, 219, 255, 0.18);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
}

body {
  display: grid;
  place-items: center;
  overflow: hidden;
  color: var(--text);
  background:
    radial-gradient(circle at 18% 16%, rgba(72, 129, 255, 0.23), transparent 30rem),
    radial-gradient(circle at 82% 72%, rgba(115, 72, 255, 0.17), transparent 32rem),
    linear-gradient(145deg, #01030a 0%, #071022 52%, #030611 100%);
}

.game-shell {
  width: min(96vw, 110vh, 1240px);
  display: grid;
  gap: 0.85rem;
}

.hero-panel,
.arena-card,
.footer-help {
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: 0 24px 90px rgba(0, 0, 0, 0.38);
  backdrop-filter: blur(18px);
}

.hero-panel {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.15rem;
  border-radius: 24px;
}

.eyebrow {
  margin: 0 0 0.24rem;
  color: var(--cyan);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(1.5rem, 4vw, 2.35rem);
  letter-spacing: -0.06em;
}

.hud {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.45rem;
  color: #dbeeff;
  font-variant-numeric: tabular-nums;
}

.hud span {
  min-width: max-content;
  padding: 0.46rem 0.72rem;
  border: 1px solid rgba(134, 213, 255, 0.18);
  border-radius: 999px;
  background: rgba(2, 8, 20, 0.58);
}

.arena-card {
  position: relative;
  overflow: hidden;
  border-radius: 30px;
}

canvas {
  display: block;
  width: 100%;
  aspect-ratio: 1200 / 760;
  border-radius: 30px;
  outline: none;
  background: #020611;
}

canvas:focus-visible {
  box-shadow: inset 0 0 0 3px rgba(97, 242, 255, 0.78);
}

.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 1rem;
  pointer-events: none;
  transition:
    opacity 160ms ease,
    transform 160ms ease;
}

.overlay[hidden] {
  display: none;
}

.overlay-card {
  width: min(720px, 92%);
  max-height: calc(100% - 2rem);
  overflow: auto;
  padding: clamp(1rem, 3vw, 1.7rem);
  border: 1px solid rgba(156, 225, 255, 0.24);
  border-radius: 28px;
  background:
    linear-gradient(145deg, rgba(13, 29, 61, 0.92), rgba(5, 10, 26, 0.92)),
    var(--panel-strong);
  box-shadow: 0 26px 100px rgba(0, 0, 0, 0.48);
}

.overlay-card h2 {
  max-width: 16ch;
  margin-bottom: 0.75rem;
  font-size: clamp(1.65rem, 4vw, 3.1rem);
  line-height: 0.94;
  letter-spacing: -0.08em;
}

.overlay-card p {
  color: var(--muted);
  line-height: 1.55;
}

.controls-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem;
  margin: 1rem 0;
}

.controls-grid div {
  padding: 0.72rem;
  border: 1px solid rgba(141, 218, 255, 0.15);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.045);
}

.controls-grid dt {
  color: var(--text);
  font-weight: 800;
}

.controls-grid dd {
  margin: 0.18rem 0 0;
  color: var(--muted);
}

.start-hint {
  margin-bottom: 0;
  color: var(--gold) !important;
  font-weight: 800;
}

.feedback {
  position: absolute;
  left: 50%;
  top: 1rem;
  transform: translateX(-50%);
  padding: 0.5rem 0.82rem;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 999px;
  opacity: 0;
  color: white;
  background: rgba(2, 9, 23, 0.72);
  box-shadow: 0 14px 48px rgba(0, 0, 0, 0.38);
  font-weight: 800;
  letter-spacing: 0.01em;
  pointer-events: none;
  transition: opacity 120ms ease;
}

.feedback.is-visible {
  opacity: 1;
}

.footer-help {
  margin: 0;
  padding: 0.72rem 1rem;
  border-radius: 18px;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.45;
}

@media (max-width: 760px) {
  body {
    overflow: auto;
    align-items: start;
    padding: 0.7rem 0;
  }

  .hero-panel {
    align-items: start;
    flex-direction: column;
  }

  .hud {
    justify-content: flex-start;
  }

  .controls-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-height: 760px) {
  .overlay-card {
    padding: 1rem;
  }

  .overlay-card h2 {
    max-width: 22ch;
    margin-bottom: 0.5rem;
    font-size: clamp(1.45rem, 3.2vw, 2.15rem);
    line-height: 0.98;
  }

  .overlay-card p {
    line-height: 1.4;
  }

  .controls-grid {
    gap: 0.35rem;
    margin: 0.65rem 0;
  }

  .controls-grid div {
    padding: 0.45rem 0.55rem;
    border-radius: 12px;
  }

  .controls-grid dd {
    font-size: 0.85rem;
  }
}