/* Mobile warning — hidden on desktop, phone-frame styled on small screens */
#mobile-warning {
  display: none;
}

@media (max-width: 768px) {
  #mobile-warning {
    display: flex;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(17, 17, 17, 0.92);
    z-index: 400;
    align-items: center;
    justify-content: center;
    font-family: monospace;
  }

  /* Phone-frame card */
  #mobile-warning .phone-frame {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    gap: 1rem;
    padding: 2.5rem 1.8rem;
    width: calc(100% - 40px);
    max-width: 340px;
    background: #111;
    border: 2px solid #ffaa44;
    border-radius: 36px;
    box-shadow: 0 0 40px rgba(255, 170, 68, 0.15);
    position: relative;
  }

  /* Decorative notch */
  #mobile-warning .phone-frame::before {
    content: '';
    position: absolute;
    top: 14px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 6px;
    background: #ffaa44;
    border-radius: 3px;
    opacity: 0.4;
  }

  #mobile-warning h2 {
    font-size: 1.6rem;
    color: #ffaa44;
    letter-spacing: 4px;
    text-shadow: 0 0 16px #ffaa4488;
    margin-bottom: 0.5rem;
  }

  #mobile-warning p {
    color: #8888cc;
    font-size: 0.9rem;
    letter-spacing: 1px;
    line-height: 1.6;
  }

  #mobile-warning a {
    margin-top: 1rem;
    color: #ffaa44;
    text-decoration: none;
    letter-spacing: 2px;
    font-size: 0.85rem;
    border: 1px solid #ffaa44;
    padding: 0.5rem 1.2rem;
    transition: background 0.2s;
  }

  #mobile-warning a:hover {
    background: rgba(255, 170, 68, 0.1);
  }
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Dark backdrop; the canvas paints the grid over the whole viewport. */
body {
  background: #111;
  min-height: 100vh;
  overflow: hidden;
  font-family: monospace;
}

/* Full-screen playfield. Hand cursor that grabs while dragging. */
#game-canvas {
  display: block;
  position: fixed;
  top: 0;
  left: 0;
  cursor: grab;
}

#game-canvas.dragging {
  cursor: grabbing;
}

/* Cell-under-cursor readout, pinned to the upper-right of the screen. */
#hover-info {
  position: fixed;
  top: 14px;
  right: 16px;
  z-index: 300;
  font-family: monospace;
  font-size: 14px;
  letter-spacing: 1px;
  color: #ffaa44;
  pointer-events: none;
  min-height: 18px; /* reserve space so nothing shifts when it fills in */
}