* { margin: 0; padding: 0; box-sizing: border-box; }
body { overflow: hidden; background: #000; font-family: 'Helvetica Neue', 'Hiragino Sans', sans-serif; touch-action: none; }

/* --- Overlay (entrance) --- */
#overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.85);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  z-index: 100; cursor: pointer; color: #fff; text-align: center;
  transition: opacity 0.6s;
}
#overlay.hidden { opacity: 0; pointer-events: none; }
#overlay h1 { font-size: 2.4rem; font-weight: 300; letter-spacing: 0.3em; margin-bottom: 1rem; }
#overlay p { font-size: 0.9rem; opacity: 0.7; line-height: 1.8; }

/* Show/hide hints based on device */
.mobile-hint { display: none; }
@media (pointer: coarse) {
  .desktop-hint { display: none; }
  .mobile-hint { display: inline; }
}

/* --- Controls hint --- */
#controls-hint {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
  color: #fff; font-size: 0.75rem; opacity: 0.4; z-index: 50;
  pointer-events: none; transition: opacity 1s;
}

/* --- FPS counter --- */
#fps-counter {
  position: fixed; top: 16px; left: 16px; z-index: 50;
  color: #fff; font-size: 0.75rem; font-family: monospace;
  background: rgba(0,0,0,0.5); padding: 4px 8px; border-radius: 4px;
  pointer-events: none;
}

/* --- Floor indicator --- */
#floor-indicator {
  position: fixed; top: 16px; left: 50%; transform: translateX(-50%);
  z-index: 50; color: #fff; font-size: 1.1rem; font-weight: 300;
  letter-spacing: 0.1em;
  background: rgba(0,0,0,0.4); padding: 6px 16px; border-radius: 20px;
  pointer-events: none; backdrop-filter: blur(4px);
}

/* --- Floor announcement overlay --- */
#floor-announce {
  position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%);
  z-index: 80; color: #fff; font-size: 4rem; font-weight: 200;
  letter-spacing: 0.3em; text-align: center;
  pointer-events: none;
  opacity: 0; transition: opacity 0.5s ease-in-out;
  text-shadow: 0 2px 20px rgba(0,0,0,0.5);
}
#floor-announce.active {
  opacity: 1;
  animation: floor-fade 2s ease-in-out forwards;
}
@keyframes floor-fade {
  0% { opacity: 0; transform: translate(-50%, -40%) scale(0.8); }
  20% { opacity: 1; transform: translate(-50%, -50%) scale(1); }
  80% { opacity: 1; transform: translate(-50%, -50%) scale(1); }
  100% { opacity: 0; transform: translate(-50%, -60%) scale(1.1); }
}

/* --- Image viewer --- */
#viewer {
  position: fixed; inset: 0; z-index: 150;
  background: rgba(0,0,0,0.92);
  display: none; flex-direction: column; align-items: center; justify-content: center;
  cursor: pointer; padding: 40px;
}
#viewer.active { display: flex; }
#viewer img {
  max-width: 90vw; max-height: 70vh; object-fit: contain;
  border-radius: 4px; box-shadow: 0 8px 32px rgba(0,0,0,0.6);
}
#viewer-info {
  margin-top: 20px; text-align: center; color: #ddd; max-width: 600px;
}
#viewer-title { font-size: 1.3rem; font-weight: 300; margin-bottom: 8px; }
#viewer-desc { font-size: 0.85rem; color: #aaa; line-height: 1.6; margin-bottom: 8px; }
#viewer-url a { color: #4a9; font-size: 0.8rem; text-decoration: none; }
#viewer-url a:hover { text-decoration: underline; }
#viewer-close {
  position: absolute; top: 16px; right: 20px;
  background: none; border: none; color: #888; font-size: 2rem;
  cursor: pointer;
}
#viewer-close:hover { color: #fff; }

/* --- Virtual joystick (mobile) --- */
#joystick-zone {
  display: none;
  position: fixed; bottom: 30px; left: 30px; z-index: 60;
  pointer-events: none;
}
@media (pointer: coarse) {
  #joystick-zone { display: block; }
}
#joystick-base {
  width: 120px; height: 120px; border-radius: 50%;
  background: rgba(255,255,255,0.12);
  border: 2px solid rgba(255,255,255,0.25);
  position: relative;
  pointer-events: auto;
  touch-action: none;
}
#joystick-knob {
  width: 44px; height: 44px; border-radius: 50%;
  background: rgba(255,255,255,0.4);
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  transition: none;
}

/* --- Mobile responsive --- */
@media (max-width: 600px) {
  #overlay h1 { font-size: 1.6rem; }
  #overlay p { font-size: 0.8rem; }
  #floor-indicator { font-size: 0.9rem; padding: 4px 12px; }
  #floor-announce { font-size: 2.5rem; }
  #viewer { padding: 16px; }
  #viewer-title { font-size: 1rem; }
}