:root {
  --center-size: 500px;
  --fade-duration: 1400ms;     /* longer fades */
  --float-duration: 8s;
  --button-min-height: 56px;   /* reserved space for buttons to avoid layout shift */
}

/* page */
html,body { height:100%; margin:0; }
body {
  background: linear-gradient(to top, rgba(255, 245, 238,0.7), rgba(255,255,255,1));
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  color: #111;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* center stage */
#stage {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* push the whole content slightly down so text isn't too high */
#content {
  text-align: center;
  transform: translateY(5vh);
}

/* message area just above Seb (a bit closer now) */
#message {
  min-height: 3.2rem;
  margin-bottom: 0.6rem;               /* reduced gap so text sits closer to Seb */
  font-size: 1.3rem;
  opacity: 0;
  transition: opacity var(--fade-duration) ease;
  pointer-events: none;
}

/* scene layout */
#scene {
  display:flex;
  align-items:center;
  justify-content:center;
  gap: 2rem;
}

/* side items (they stay hidden until set) */
.side-item {
  width: 140px;
  height: auto;
  opacity: 0;
  transform: translateY(10px) scale(0.98);
  transition: opacity 400ms ease, transform 400ms ease;
  pointer-events: none;
}

/* seb container */
#seb-wrap {
  width: var(--center-size);
  height: var(--center-size);
  display:flex;
  align-items:center;
  justify-content:center;
  position: relative;
}

/* subtle floating animation (longer) */
#seb {
  width: 100%;
  height: auto;
  display:block;
  animation: float var(--float-duration) ease-in-out infinite;
  will-change: transform;
}
@keyframes float {
  0% { transform: translateY(0px); }
  50% { transform: translateY(8px); }
  100% { transform: translateY(0px); }
}

/* buttons container - reserves height so showing buttons does not move anything */
#controls {
  margin-top: 12px;
  display: flex;
  gap: 1rem;
  justify-content: center;
  min-height: var(--button-min-height); /* reserve space, prevents layout shift */
  opacity: 0;
  pointer-events: none;
  transition: opacity 300ms ease;
}

#controls.visible {
  opacity: 1;
  pointer-events: auto;
}

/* buttons */
.btn {
  background: transparent;
  border: 1px solid rgba(0,0,0,0.12);
  max-height: 38px;
  padding-left:12px;
  padding-right:12px;
  border-radius: 0px;
  cursor: pointer;
  font-size: 1rem;
  transition: transform 180ms ease, background 140ms ease;
  user-select: none;
}
.btn:hover { transform: translateY(-3px); }
.btn:active { transform: translateY(0px) scale(0.995); }

/* overlay for fade-to-white */
#white-overlay {
  position: fixed;
  inset: 0;
  background: white;
  opacity: 0;
  pointer-events: none;
  transition: opacity 1200ms ease;
  z-index: 200;
}

/* iron base styling (no opacity transitions — we animate transform from JS) */
.iron {
  position: fixed;
  left: 50%;
  top: 0;
  transform: translateX(-50%) translateY(-150vh);
  width: 260px;
  height: auto;
  z-index: 120;
  pointer-events: none;
  will-change: transform;
}