:root {
  --red: #E4102B;
  --navy: #1B2560;
  --bg-0: #0a0e1a;
  --bg-1: #0f1530;
  --grid-a: #131a38;
  --grid-b: #101532;
  --text: #eef1ff;
  --muted: #8b93c4;
  --radius: 18px;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  background: radial-gradient(circle at 50% 0%, var(--bg-1), var(--bg-0) 70%);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  overflow-x: hidden;
  overscroll-behavior-y: contain;
  -webkit-tap-highlight-color: transparent;
}

.app {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 18px 16px calc(20px + env(safe-area-inset-bottom));
  gap: 14px;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-logo {
  height: 42px;
  width: auto;
  filter: drop-shadow(0 2px 8px rgba(228, 16, 43, 0.35));
}

.topbar h1 {
  margin: 0;
  font-size: 26px;
  font-weight: 800;
  letter-spacing: 6px;
  background: linear-gradient(90deg, var(--red), #ff5b6e);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hud {
  display: flex;
  gap: 28px;
}

.hud-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 6px 20px;
  min-width: 90px;
}

.hud-label {
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--muted);
  text-transform: uppercase;
}

.hud-value {
  font-size: 22px;
  font-weight: 800;
  color: var(--text);
}

.mute-btn {
  align-self: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.04);
  font-size: 18px;
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s ease, transform 0.15s ease;
}

.mute-btn:hover {
  background: rgba(255, 255, 255, 0.09);
}

.mute-btn:active {
  transform: scale(0.94);
}

.board-wrap {
  position: relative;
  border-radius: var(--radius);
  padding: 10px;
  background: linear-gradient(145deg, #171d40, #0c1130);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.06),
    0 20px 50px rgba(0, 0, 0, 0.55),
    inset 0 0 40px rgba(228, 16, 43, 0.04);
  transition: box-shadow 0.3s ease;
}

.board-wrap.boost {
  animation: boost-glow 0.7s ease-in-out infinite alternate;
}

@keyframes boost-glow {
  from {
    box-shadow:
      0 0 0 1px rgba(255, 200, 60, 0.5),
      0 0 30px 6px rgba(255, 180, 40, 0.45),
      0 20px 50px rgba(0, 0, 0, 0.55),
      inset 0 0 40px rgba(255, 180, 40, 0.08);
  }
  to {
    box-shadow:
      0 0 0 1px rgba(255, 200, 60, 0.9),
      0 0 50px 14px rgba(255, 180, 40, 0.7),
      0 20px 50px rgba(0, 0, 0, 0.55),
      inset 0 0 60px rgba(255, 180, 40, 0.16);
  }
}

#board {
  display: block;
  width: min(88vw, 480px);
  height: min(88vw, 480px);
  border-radius: 12px;
  background: var(--bg-0);
  touch-action: none;
  -webkit-touch-callout: none;
  user-select: none;
}

.overlay {
  position: absolute;
  inset: 10px;
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 12px;
  padding: 24px;
  background: rgba(6, 8, 20, 0.86);
  backdrop-filter: blur(6px);
  transition: opacity 0.2s ease;
}

.overlay.hidden {
  display: none;
}

.overlay-logo {
  width: 130px;
  height: auto;
  margin-bottom: 6px;
  filter: drop-shadow(0 4px 14px rgba(228, 16, 43, 0.4));
}

.overlay h2 {
  margin: 0;
  font-size: 24px;
  letter-spacing: 1px;
}

.overlay p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

.overlay button {
  margin-top: 8px;
  padding: 12px 32px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 1px;
  color: #fff;
  background: linear-gradient(135deg, var(--red), #b40d20);
  border: none;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(228, 16, 43, 0.4);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.overlay button:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(228, 16, 43, 0.5);
}

.overlay button:active {
  transform: translateY(0);
}

.touch-controls {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
}

.touch-controls button {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  font-size: 20px;
  touch-action: manipulation;
  -webkit-touch-callout: none;
  user-select: none;
}

.touch-controls button:active {
  background: rgba(228, 16, 43, 0.35);
}

.touch-row {
  display: flex;
  gap: 8px;
}

.footer {
  margin-top: 4px;
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--muted);
  text-transform: uppercase;
}

@media (pointer: coarse) {
  .touch-controls {
    display: flex;
  }
}

@media (max-width: 480px), (max-height: 720px) {
  .app {
    padding: 10px 10px calc(12px + env(safe-area-inset-bottom));
    gap: 8px;
  }

  .brand-logo {
    height: 32px;
  }

  .topbar h1 {
    font-size: 20px;
    letter-spacing: 4px;
  }

  .hud-item {
    padding: 4px 14px;
    min-width: 72px;
  }

  .hud-value {
    font-size: 18px;
  }

  .mute-btn {
    width: 36px;
    height: 36px;
    font-size: 16px;
  }

  .board-wrap {
    padding: 6px;
  }

  .touch-controls button {
    width: 48px;
    height: 48px;
    font-size: 18px;
  }

  .footer {
    display: none;
  }
}