/* ── Base ── */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #F0E9D8;
  font-family: "Hiragino Mincho ProN", "Yu Mincho", "Noto Serif JP", Georgia, serif;
  -webkit-user-select: none;
  -moz-user-select: none;
  user-select: none;
  touch-action: none;
  overscroll-behavior: none;
  -webkit-overflow-scrolling: none;
}

/* ── Scene ── */
#scene-container {
  position: relative;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
 -webkit-tap-highlight-color: transparent;
   /* Ink bleed filter: soft Gaussian blur merged with source to mimic pigment on absorbent paper */
  filter: url('#inkBleed');
}
#main-canvas {
  display: block;
  width: 100%;
  height: 100%;
}
#overlay-svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

/* ── Registration border (woodblock edge) ── */
#scene-container::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  box-shadow:
    inset 0 0 0 1.5px rgba(42, 48, 72, .06),
    inset 3px 3px 0 rgba(175, 85, 48, .04);
  z-index: 3;
}

/* ── Removed redundant CSS grain overlay: grain rendered on canvas ── */
/* ── GPU compositing hints for canvas ── */
#main-canvas {
  will-change: transform;
  transform: translateZ(0);
}

/* ── Prompt overlay: unobtrusive, mobile-safe ── */
#prompt {
  position: absolute;
  bottom: 6vh;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(42, 48, 72, .35);
  font-size: clamp(10px, 1.6vw, 13px);
  letter-spacing: .14em;
  text-indent: .14em;
  text-transform: lowercase;
  pointer-events: none;
  transition: opacity 2.2s ease;
  white-space: nowrap;
  z-index: 5;
  max-width: 90vw;
  overflow: hidden;
  text-overflow: ellipsis;
}
#prompt.hidden {
  opacity: 0;
}

/* ── Final print state title ── */
#final-title {
   position: absolute;
   bottom: 4vh;
   left: 50%;
   transform: translateX(-50%);
   color: rgba(42, 48, 72, .15);
   font-size: clamp(9px, 1.3vw, 11px);
   letter-spacing: .18em;
   text-transform: lowercase;
   pointer-events: none;
   opacity: 0;
   transition: opacity 2.8s ease;
   white-space: nowrap;
   z-index: 5;
}
#final-title.visible {
   opacity: 1;
}

/* ── Hanko seal (浮世 - 'floating world') ── */
#hanko {
  position: absolute;
  top: 3.5vh;
  right: 3.5vw;
  color: rgba(175, 55, 48, .22);
  font-size: clamp(10px, 1.8vw, 16px);
  font-family: "Hiragino Mincho ProN", "Yu Mincho", "Noto Serif JP", Georgia, serif;
  letter-spacing: .1em;
  writing-mode: vertical-rl;
  pointer-events: none;
  z-index: 4;
  line-height: 1.3;
}

/* ── Mobile refinements ── */
@media (max-width: 600px) {
    #prompt {
    font-size: clamp(9px, 3.2vw, 12px);
    letter-spacing: .1em;
    bottom: 5vh;
    }
    #final-title {
    font-size: clamp(8px, 2.8vw, 10px);
    bottom: 3vh;
    }
    #hanko {
    top: 2.5vh;
    right: 2.5vw;
    font-size: clamp(9px, 2.5vw, 13px);
    }
}