/**
 * scene-transition.css - Experimental scene compositor & transitions
 *
 * Native document scroll is the only input.
 * Boundary overlap replaces sticky/vertical-slide stack.
 */

html.spiral-scenes {
  scroll-behavior: auto;
  scroll-padding-top: 0;
}

/* One theme-aware backdrop fills viewport, independent of chapter height */
html.spiral-scenes::before {
  content: "";
  position: fixed;
  inset: 0;
  background: var(--background);
  z-index: 0;
  pointer-events: none;
}

.spiral-scenes main {
  isolation: auto;
}

.scene-slot {
  position: relative;
}

.spiral-scenes .scene-slot {
  pointer-events: none;
}

.spiral-scenes #hero-scroll-zone {
  min-height: 0;
}

.spiral-scenes .scene-slot > .chapter,
.spiral-scenes #hero-scroll-zone > #hero {
  position: fixed;
  inset: 0 0 auto;
  margin: 0;
  min-height: var(--scene-height);
  height: auto;
  width: 100%;
  background: transparent;
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  z-index: 3;
  transform-origin: 50% calc(var(--scene-height) / 2);
}

.spiral-scenes #hero-scroll-zone > #hero {
  height: var(--scene-height);
}

/* Override ID-specific legacy sticky gallery layout */
html.spiral-scenes :is(#usage-title, #event-shop-title).cylinder-target {
  position: fixed;
  inset: 0 0 auto;
  height: var(--scene-height);
  min-height: var(--scene-height);
  background: transparent;
}

.spiral-scenes .chapter[data-scene-visible="true"] {
  visibility: visible;
}

.spiral-scenes #hero-scroll-zone > #hero[data-scene-visible="true"] {
  visibility: visible;
}

.spiral-scenes .chapter[data-scene-interactive="true"] {
  pointer-events: auto;
}

.spiral-scenes .chapter[data-scene-transitioning="true"] {
  will-change: opacity;
}

.spiral-background {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 4;
  pointer-events: none;
  opacity: 0;
}

.spiral-scenes
  .scene-slot
  > .chapter
  > :is(.gs-container, .ju-container, .apology-grid),
.spiral-scenes #faq-slide > #faq-accordion {
  transform: none;
}

.spiral-scenes #works > .gs-container,
.spiral-scenes #specs .gs-container {
  max-height: none;
  overflow: visible;
}

.spiral-scenes .visual .ov {
  transform: none;
  clip-path: none;
}

/* Explicit viewport width for morphing hero words */
.spiral-scenes #hero .hero-title {
  width: 100vw;
}

html.spiral-scenes:is([data-hero-state="transition"], [data-hero-state="site"])
  #hero
  .hero-title {
  color: var(--foreground);
  mix-blend-mode: normal;
}

.spiral-scenes .device-shell[data-rotation-complete="false"] iframe {
  pointer-events: none;
}

/* Perspective isolation */
.spiral-scenes #modeling .ju-persp,
.spiral-scenes #simulator .simu-wrapper {
  perspective: none;
}

.spiral-scenes #modeling > .gs-container,
.spiral-scenes #simulator .simu-wrapper {
  filter: opacity(1);
}

/* Fade copy independently */
.spiral-scenes [data-scene-copy] {
  filter: opacity(var(--scene-copy-opacity, 1));
}

@media (orientation: landscape) and (max-height: 560px) {
  html.spiral-scenes {
    --section-space: 1.5rem;
  }
}

.spiral-scenes #site-notice {
  z-index: 901;
}

/* Specs layout specificity */
.spiral-scenes #specs .gs-grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.spiral-scenes #specs .gs-work-card {
  min-width: 0;
  overflow-wrap: anywhere;
}

@media (max-width: 700px), (orientation: portrait) {
  .spiral-scenes #specs .gs-grid-4 {
    grid-template-columns: minmax(0, 1fr);
  }

  .spiral-scenes #specs .gs-work-card {
    max-width: 620px;
    width: 100%;
    margin-inline: auto;
  }
}

@media (orientation: landscape) and (max-height: 560px) {
  .spiral-scenes #specs .gs-work-image-wrapper {
    width: min(
      100%,
      max(
        90px,
        calc(
          (
              var(--scene-height) - var(--header-height) -
                var(--persistent-bottom)
            ) *
            0.42
        )
      )
    );
    margin-inline: auto;
  }
}

/* Long reading chapters */
.spiral-scenes #specs .gs-container,
.spiral-scenes #policy .ju-acc,
.spiral-scenes #originalballmaking-accordion .ju-acc,
.spiral-scenes #faq-accordion .ju-acc {
  max-height: none;
  overflow: visible;
  overscroll-behavior: auto;
}

/* HERO 2 composition */
.spiral-scenes .scene-slot > #hero-2-slide {
  height: var(--scene-height);
  min-height: 0;
  padding: 0;
}

.spiral-scenes #hero-2 {
  position: absolute;
  inset: 0;
  height: var(--scene-height);
  min-height: 0;
}

.spiral-scenes #hero-2 .hero-title {
  padding-top: var(--header-height);
  padding-bottom: var(--persistent-bottom);
}

html.spiral-scenes.footer-visible .scene-slot > #hero-2-slide.chapter {
  padding-bottom: 0;
}

.hero-loading-status {
  position: absolute;
  bottom: max(24px, env(safe-area-inset-bottom));
  left: calc(50% - 7px);
  z-index: 10;
  margin: 0;
  width: 14px;
  height: 14px;
  border: 1px solid #ffffff40;
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: hero-loading-spin 1.2s linear infinite;
}

.hero-loading-status[hidden] {
  display: none;
}

@keyframes hero-loading-spin {
  to {
    transform: rotate(360deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero-loading-status {
    animation: none;
  }
}

.device-media-status {
  pointer-events: auto;
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  padding: 0.5em 0.8em;
  border: 0;
  border-radius: 4px;
  color: #ffffff;
  background: #000000cc;
  font: 12px/1.5 sans-serif;
  white-space: nowrap;
}

.device-media-status:disabled {
  pointer-events: none;
}

/* Modeling YouTube presentation-only */
.spiral-scenes #modeling .device-shell iframe {
  pointer-events: none;
}

/* Footer latch */
html.spiral-scenes.footer-visible #hero-2 {
  overflow: visible;
}

html.spiral-scenes.footer-visible #hero-2 .hero-media {
  height: var(--scene-height);
  bottom: auto;
}

/* YouTube presentation priming */
.ju-yt {
  opacity: 0;
  pointer-events: none;
}

.ju-yt[data-primed="true"] {
  opacity: 1;
}

/* Touch HERO stability */
@media (any-pointer: coarse) {
  html.spiral-scenes #hero-scroll-zone > #hero {
    height: 100lvh;
    min-height: 100lvh;
    transform-origin: 50% 50lvh;
  }
}

html.spiral-scenes,
html.spiral-scenes body {
  overscroll-behavior-y: none;
}

.hero-media-retry {
  pointer-events: auto;
  position: absolute;
  bottom: max(24px, env(safe-area-inset-bottom));
  left: 50%;
  transform: translateX(-50%);
  z-index: 12;
}

.hero-media-retry[hidden] {
  display: none;
}

/* Contact apology responsive */
@media (max-width: 600px) and (orientation: portrait) {
  html.spiral-scenes #contact-apology.chapter {
    justify-content: center;
    padding-top: calc(var(--header-height) + 8px);
    padding-bottom: calc(var(--persistent-bottom) + 8px);
  }

  #contact-apology .apology-grid {
    gap: 10px;
  }

  #contact-apology :is(h2, h3) {
    font-size: 18px;
    line-height: 1.25;
    margin: 0 0 6px;
  }

  #contact-apology .gs-card-text {
    font-size: 12px;
    line-height: 1.5;
  }

  #contact-apology .dragArea {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
  }

  #contact-apology .form-group {
    margin: 0;
  }

  #contact-apology .form-group:nth-child(n + 3),
  #contact-apology button {
    grid-column: 1 / -1;
  }

  #contact-apology input {
    height: 40px;
    min-height: 40px;
    padding: 8px;
    font-size: 16px;
  }

  #contact-apology textarea {
    height: 64px;
    min-height: 64px;
    padding: 8px;
    font-size: 16px;
  }

  #contact-apology button {
    min-height: 40px;
    padding: 6px 10px;
  }
}

/* HERO 2 persistent sizing */
html.spiral-scenes.footer-visible .scene-slot > #hero-2-slide.chapter {
  min-height: var(--scene-height);
  height: var(--scene-height);
}

.spiral-scenes #hero-2 .hero-title,
html.spiral-scenes.footer-visible #hero-2 .hero-title {
  padding-top: var(--header-height);
  padding-bottom: 0;
}

/* Touch blocker surfaces */
.spiral-scenes #hero-2 .hero-video,
.spiral-scenes #modeling .ju-media {
  pointer-events: auto;
}

.spiral-scenes #hero-2 .hero-video::after,
.spiral-scenes #modeling .ju-media::after,
#hero-2::after,
.yt-touch-blocker {
  content: "" !important;
  position: absolute !important;
  inset: 0 !important;
  width: 100% !important;
  height: 100% !important;
  z-index: 100 !important;
  pointer-events: auto !important;
  touch-action: pan-y pinch-zoom !important;
  background: rgba(0, 0, 0, 0.001) !important;
  cursor: default !important;
}

#hero-2 iframe,
#modeling iframe,
iframe.ju-yt,
iframe[data-src*="youtube"] {
  pointer-events: none !important;
}

/* True vertical centering for #design on mobile touch devices */
@media (hover: none) and (pointer: coarse) and (orientation: portrait) and (max-width: 820px) {
  html.spiral-scenes #design.chapter {
    display: flex !important;
    flex-direction: column !important;
    justify-content: center !important;
    align-items: center !important;
    box-sizing: border-box !important;
    padding-top: calc(var(--header-height, 68px) + 8px) !important;
    padding-bottom: max(var(--safe-bottom, 0px), 8px) !important;
    padding-inline: var(--gutter) !important;
  }

  html.spiral-scenes.footer-visible #design.chapter {
    padding-bottom: calc(var(--footer-height, 84px) + 8px) !important;
  }
}