/* ui-v4.css
   Second upgrade layer: chapter labels, live feedback,
   calendar transitions and viewer polish. CSS-only visuals. */

:root {
  --ui4-ease: cubic-bezier(.22, .9, .26, 1);
}

/* Toast feedback shared by home, calendar and gallery. */
.ui3-toast-region {
  position: fixed;
  z-index: 1300;
  right: max(18px, env(safe-area-inset-right));
  bottom: max(82px, env(safe-area-inset-bottom));
  display: grid;
  gap: 10px;
  width: min(360px, calc(100vw - 36px));
  pointer-events: none;
}

.ui3-toast {
  display: flex;
  align-items: center;
  gap: 11px;
  min-height: 48px;
  padding: 12px 16px;
  border: 2px solid var(--v3-ink);
  border-radius: var(--v3-radius-md);
  color: var(--v3-ink);
  background: rgba(255, 253, 247, .96);
  box-shadow: 4px 4px 0 var(--v3-sky), 0 18px 44px rgba(39, 49, 58, .16);
  font: 800 12px/1.5 var(--shared-font, var(--sans));
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px) scale(.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: opacity .3s ease, visibility .3s ease, transform .35s var(--ui4-ease), box-shadow .3s ease;
}

.ui3-toast::before {
  width: 9px;
  height: 9px;
  flex: 0 0 auto;
  border-radius: 50%;
  content: '';
  background: var(--v3-coral);
  box-shadow: 0 0 0 4px rgba(255, 142, 113, .16);
}

.ui3-toast.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.ui3-toast[data-tone="success"] {
  box-shadow: 4px 4px 0 var(--v3-yellow), 0 18px 44px rgba(39, 49, 58, .14);
}

.ui3-toast[data-tone="success"]::before {
  background: var(--v3-green);
  box-shadow: 0 0 0 4px rgba(88, 125, 53, .16);
}

.ui3-toast[data-tone="error"] {
  box-shadow: 4px 4px 0 var(--v3-coral), 0 18px 44px rgba(39, 49, 58, .14);
}

.ui3-toast[data-tone="error"]::before {
  background: var(--v3-coral-deep);
  box-shadow: 0 0 0 4px rgba(255, 111, 90, .16);
}

html.requires-entry .ui3-toast-region {
  opacity: 0;
  visibility: hidden;
}

/* Home story rail: named chapter stops instead of anonymous dots. */
body.line-puppy-theme .story-rail {
  right: 26px;
  width: 10px;
  height: 196px;
}

body.line-puppy-theme .story-rail::before,
body.line-puppy-theme .story-rail::after {
  left: 5px;
}

body.line-puppy-theme .story-rail i {
  left: 2px;
  width: 8px;
  height: 8px;
}

body.line-puppy-theme .story-rail i::after {
  position: absolute;
  z-index: 2;
  top: 50%;
  right: 17px;
  padding: 5px 9px;
  border: 2px solid var(--v3-ink);
  border-radius: var(--v3-radius-pill);
  content: attr(data-label);
  color: var(--v3-ink);
  background: var(--v3-paper);
  box-shadow: 3px 3px 0 var(--v3-yellow);
  font: 800 9px/1 var(--sans);
  letter-spacing: .08em;
  opacity: 0;
  transform: translate(8px, -50%);
  white-space: nowrap;
  transition: opacity .3s ease, transform .35s var(--ui4-ease);
}

body.line-puppy-theme .story-rail i.is-active::after {
  opacity: 1;
  transform: translate(0, -50%);
}

/* Calendar month change: a soft paper shuffle. */
.calendar-grid.is-switching {
  animation: ui4GridFade .3s ease backwards;
}

.calendar-grid.is-switching .calendar-day {
  animation: ui4CellIn .42s var(--ui4-ease) backwards;
}

.calendar-grid.is-switching .calendar-day:nth-child(7n+1) { animation-delay: .01s; }
.calendar-grid.is-switching .calendar-day:nth-child(7n+2) { animation-delay: .018s; }
.calendar-grid.is-switching .calendar-day:nth-child(7n+3) { animation-delay: .026s; }
.calendar-grid.is-switching .calendar-day:nth-child(7n+4) { animation-delay: .034s; }
.calendar-grid.is-switching .calendar-day:nth-child(7n+5) { animation-delay: .042s; }
.calendar-grid.is-switching .calendar-day:nth-child(7n+6) { animation-delay: .05s; }
.calendar-grid.is-switching .calendar-day:nth-child(7n) { animation-delay: .058s; }

@keyframes ui4GridFade {
  from {
    opacity: .58;
    filter: blur(2px);
  }
  to {
    opacity: 1;
    filter: blur(0);
  }
}

@keyframes ui4CellIn {
  from {
    opacity: 0;
    transform: translateY(9px) scale(.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* Photo viewer: soft entrance for every image, swipe-friendly surface. */
.gallery-viewer__image {
  touch-action: pan-y;
}

.gallery-viewer__image img {
  animation: ui4PhotoIn .42s var(--ui4-ease) both;
}

@keyframes ui4PhotoIn {
  from {
    opacity: 0;
    transform: scale(.965);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

body.line-puppy-theme .memory-viewer__image {
  position: relative;
}

body.line-puppy-theme .memory-viewer__image::after {
  position: absolute;
  inset: 0;
  content: '';
  background: linear-gradient(180deg, rgba(39, 49, 58, .04), transparent 34%, rgba(39, 49, 58, .18));
  pointer-events: none;
}

/* Slightly more tactile dialog controls. */
.gallery-viewer__close,
.gallery-viewer__step {
  transition: transform .25s var(--ui4-ease), box-shadow .25s ease, background .25s ease, color .25s ease;
}

.gallery-viewer__close:hover,
.gallery-viewer__step:hover:not(:disabled) {
  color: #fff;
  background: var(--v3-coral);
  box-shadow: 4px 4px 0 var(--v3-ink);
  transform: translateY(-2px);
}

.gallery-viewer__step--prev:hover:not(:disabled) {
  transform: translate(-3px, -2px);
}

.gallery-viewer__step--next:hover:not(:disabled) {
  transform: translate(3px, -2px);
}

/* Reduced motion: keep the shell quiet. */
@media (prefers-reduced-motion: reduce) {
  .ui3-toast,
  .calendar-grid,
  .calendar-grid .calendar-day,
  .gallery-viewer__image img,
  .gallery-viewer__close,
  .gallery-viewer__step,
  body.line-puppy-theme .story-rail i::after {
    animation: none;
    transition: none;
  }
}

@media (max-width: 620px) {
  .ui3-toast-region {
    right: 12px;
    bottom: max(70px, env(safe-area-inset-bottom));
    width: calc(100vw - 24px);
  }
}