/* ──────────────────────────────────────────
   Gravity Ball experiment
   ────────────────────────────────────────── */

.gravity-container {
  position: relative;
  width: 100%;
  /* Fill the viewport under the site header (~64 px tall) */
  height: calc(100dvh - 68px);
  overflow: hidden;
  background: #06060f;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
  -webkit-user-select: none;
}

/* Canvas fills the container; touch-action:none prevents scroll hijack */
.gravity-canvas {
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}

/* ── Drag-direction SVG overlay ── */
.gravity-arrow-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 20;
}

/* ── HUD (pin counter) ── */
.gravity-hud {
  position: absolute;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.85);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  padding: 6px 18px;
  border-radius: 20px;
  z-index: 10;
  pointer-events: none;
}

/* ── Idle / Won overlay ── */
.gravity-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--primary-text, #fff);
  z-index: 10;
  padding: var(--norm, 1rem);
  gap: 0.5rem;
}

.gravity-overlay h2 {
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  margin: 0 0 0.4rem;
}

.gravity-overlay p {
  font-size: clamp(0.9rem, 2.5vw, 1.1rem);
  opacity: 0.75;
  margin: 0;
  line-height: 1.5;
}

/* ── Re-use funButton from flappy.css ── */
.gravity-overlay .funButton {
  display: inline-block;
  padding: var(--norm, 0.75rem) calc(var(--norm, 0.75rem) * 2);
  margin: calc(var(--norm, 0.75rem) * 1.5) 0 0;
  text-align: center;
  text-decoration: none;
  color: var(--primary-text, #fff);
  background-color: var(--flavor-1, #3355ff);
  border: none;
  border-radius: calc(var(--norm, 0.75rem) * 0.5);
  box-shadow: 0 8px 6px -6px black;
  transition: all 0.3s ease-in-out;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
}

.gravity-overlay .funButton:hover {
  background-color: var(--flavor-2, #5577ff);
  box-shadow: 0 12px 10px -8px #333;
  transform: scale(1.08);
}

.gravity-overlay .funButton:active {
  background-color: var(--flavor-3, #2244dd);
  box-shadow: 0 4px 3px -2px #333;
  transform: scale(1.03);
}

/* ── Loading indicator ── */
.gravity-loader {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: radial-gradient(circle at 38% 35%, rgba(160, 210, 255, 0.6), transparent 60%),
              #3366ff;
  box-shadow: 0 0 18px rgba(60, 120, 255, 0.55);
  animation: gravityBounce 0.75s cubic-bezier(0.45, 0, 0.55, 1) infinite alternate;
  margin: 0 auto 0.75rem;
}

@keyframes gravityBounce {
  from {
    transform: translateY(-18px);
    box-shadow: 0 2px 6px rgba(60, 120, 255, 0.3);
  }
  to {
    transform: translateY(18px);
    box-shadow: 0 20px 24px rgba(60, 120, 255, 0.15);
  }
}

.gravity-loading-text {
  font-size: 0.9rem;
  opacity: 0.55;
  letter-spacing: 0.06em;
  margin: 0;
}

/* ── Mobile tweaks ── */
@media (max-width: 600px) {
  .gravity-hud {
    font-size: 0.85rem;
    padding: 5px 14px;
  }
}