/* Newspaper Flipbook
   Self-contained, no external libraries required. */

:root {
  /* Design Tokens: Heritage Broadsheet */
  --paper-base: #f3efe6;
  --paper-warm: #efe9dc;
  --paper-edge: #ffffff;
  --ink: #1e1e1e;
  --ink-soft: #6a6a6a;
  --rule: rgba(0, 0, 0, 0.12);
  --rule-strong: rgba(0, 0, 0, 0.24);
  --accent: #8f2d24;

  --s1: 4px;
  --s2: 6px;
  --s3: 8px;
  --s4: 10px;
  --s5: 12px;
  --s6: 14px;
  --s7: 16px;
  --s8: 22px;

  --r1: 4px;
  --r2: 6px;
  --r3: 10px;
  --r4: 12px;

  /* Semantic aliases for existing styles */
  --paper: var(--paper-base);
  --muted: var(--ink-soft);
  --frame: var(--rule);

  /* Used by the page shading overlay, set by JS in real time */
  --shade: 0;
  --shade2: 0;
  --hinge: 0;
  --glint: 0;
  --cast: 0;
  --liftShadow: 0;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  /* Warm tabletop ambiance: soft vertical wash + subtle vignette */
  background:
    radial-gradient(1300px 900px at 50% 12%, rgba(255, 255, 255, 0.24) 0%, rgba(0, 0, 0, 0.06) 100%),
    linear-gradient(180deg, #f6f1e7 0%, #f1ebdf 52%, #eee6d8 100%);
  font-family: ui-serif, Georgia, "Times New Roman", Times, serif;
  isolation: isolate;
}

/* Global paper grain overlay (non-interactive; fixed to viewport) */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.08; /* Fallback when blend modes are unsupported */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220' viewBox='0 0 220 220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' seed='8'/%3E%3C/filter%3E%3Crect width='220' height='220' filter='url(%23n)' opacity='0.22'/%3E%3C/svg%3E");
  background-size: 220px 220px;
  background-repeat: repeat;
}

@supports (mix-blend-mode: multiply) {
  body::before {
    mix-blend-mode: multiply;
    opacity: 0.09;
  }
}

.wrap {
  min-height: 100%;
  display: grid;
  place-items: start center;
  align-content: start; /* prevents stretched rows that create the big gap */
  padding: 22px 14px 34px;
  gap: 16px;
}

.topbar {
  width: min(1060px, 100%);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 10px 7px;
  position: relative;
}

.topbar::before,
.topbar::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 3px;
  background:
    linear-gradient(
      to bottom,
      var(--rule) 0 1px,
      transparent 1px 2px,
      var(--rule) 2px 3px
    );
  pointer-events: none;
}

.topbar::before {
  top: 0;
}

.topbar::after {
  bottom: 0;
}

.brand__kicker {
  letter-spacing: 0.22em;
  text-transform: uppercase;
  font-size: 10px;
  line-height: 1.1;
  color: var(--muted);
}

.brand__title {
  font-family: ui-serif, Georgia, "Times New Roman", Times, serif;
  font-size: 34px;
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.012em;
}

.hints {
  position: relative;
  display: inline-flex;
  justify-content: flex-end;
  align-items: center;
  text-align: right;
  color: var(--muted);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  font-size: 11px;
  line-height: 1.25;
}

.helpBtn {
  appearance: none;
  width: 26px;
  height: 26px;
  border-radius: 999px;
  border: 1px solid var(--frame);
  background: color-mix(in srgb, var(--paper-base) 78%, #fff 22%);
  color: var(--ink-soft);
  font: 700 14px/1 ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  display: inline-grid;
  place-items: center;
  padding: 0;
  cursor: pointer;
}

.helpBtn:hover {
  border-color: var(--rule-strong);
  color: var(--ink);
}

.helpBtn:focus-visible {
  outline: 3px solid rgba(0,0,0,0.25);
  outline-offset: 2px;
}

.helpPop {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  width: min(280px, 82vw);
  max-width: 280px;
  padding: 8px 10px;
  border: 1px solid var(--frame);
  border-radius: 3px;
  background: color-mix(in srgb, var(--paper-base) 88%, #fff 12%);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.16);
  text-align: left;
  font-size: 12px;
  line-height: 1.35;
  z-index: 12;
}

.helpPop__section {
  display: grid;
  gap: 4px;
  padding: 8px 0;
}

.helpPop__section + .helpPop__section {
  border-top: 1px solid var(--rule);
}

.helpPop__label {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 11px;
  color: var(--ink-soft);
}

.helpPop__item {
  color: var(--ink);
}

.helpPop__item + .helpPop__item {
  margin-top: 0;
}

.helpPop__details {
  border-top: 1px solid var(--rule);
  padding-top: 8px;
}

.helpPop__summary {
  cursor: pointer;
  list-style: none;
  color: var(--ink-soft);
  letter-spacing: 0.06em;
}

.helpPop__summary::-webkit-details-marker {
  display: none;
}

.helpPop__summary::after {
  content: "›";
  float: right;
  opacity: 0.7;
  transform: rotate(90deg);
  transition: transform 160ms ease;
}

.helpPop__details[open] .helpPop__summary::after {
  transform: rotate(-90deg);
}

.helpPop__keys {
  display: grid;
  gap: 8px;
  padding-top: 8px;
}

.helpPop__keyRow {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 10px;
  align-items: start;
}

.helpPop__keyLabel {
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 10px;
  padding-top: 2px;
}

.helpPop kbd {
  display: inline-block;
  padding: 2px 6px;
  margin: 0 4px 4px 0;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: color-mix(in srgb, var(--paper-base) 88%, #fff 12%);
  color: var(--ink-soft);
  font-size: 11px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  line-height: 1.2;
}

.helpPop__keyHint {
  color: var(--ink-soft);
  font-size: 11px;
}

.kbd {
  display: inline;
  padding: 0;
  margin: 0 1px;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--ink-soft);
  font-size: inherit;
  line-height: inherit;
  font-weight: 600;
}

.stage {
  width: min(1060px, 100%);
  display: grid;
  place-items: center;
  gap: 12px;
}

.flipbook-shell {
  position: relative;
  width: min(92vw, 980px);
}

.flipbook-shell::before,
.flipbook-shell::after {
  content: "";
  position: absolute;
  width: 26px;
  height: 26px;
  bottom: 14px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 180ms ease, transform 180ms ease;
  clip-path: polygon(100% 0, 0 100%, 100% 100%);
  background:
    linear-gradient(145deg, rgba(255,255,255,0.72) 0%, rgba(255,255,255,0.28) 52%, rgba(0,0,0,0.08) 100%),
    linear-gradient(45deg, rgba(0,0,0,0.08) 0%, rgba(0,0,0,0) 70%);
  filter: drop-shadow(0 1px 2px rgba(0,0,0,0.18));
  z-index: 4;
}

.flipbook-shell::before {
  right: 14px;
}

.flipbook-shell::after {
  left: 14px;
  transform: scaleX(-1);
}

.flipbook-shell.can-next::before {
  opacity: 0.16;
}

.flipbook-shell.can-prev::after {
  opacity: 0.16;
}

.flipbook-shell.edge-right.can-next::before {
  opacity: 0.45;
  transform: translateY(-1px);
}

.flipbook-shell.edge-left.can-prev::after {
  opacity: 0.45;
  transform: translateY(-1px) scaleX(-1);
}

.flipbook {
  position: relative;
  width: 100%;
  aspect-ratio: 3 / 4;
  perspective: 1500px;
  transform-style: preserve-3d;
  cursor: grab;
  --stackProgress: 0;
  --stackPx: clamp(2px, calc(14px - (12px * var(--stackProgress))), 14px);
  border: 1px solid var(--frame);
  border-radius: var(--r1);
  overflow: hidden;
  background: #fff;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.68),
    inset 0 0 0 1px rgba(0, 0, 0, 0.04),
    inset 0 -10px 18px rgba(0, 0, 0, 0.03),
    0 1px 1px rgba(0, 0, 0, 0.14),
    0 8px 16px rgba(0, 0, 0, 0.11),
    0 18px 34px rgba(0, 0, 0, 0.09),
    0 32px 50px rgba(0, 0, 0, 0.07);
  /* Deckle mask disabled by default for broad browser/file-mode reliability. */
  -webkit-mask-image: none;
  mask-image: none;
  /* Allows swipe interactions but does not block pinch zoom on most browsers */
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
}

.flipbook.is-dragging {
  cursor: grabbing;
}

/* Right-edge page stack hint (shrinks as reading progresses) */
.flipbook::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: var(--stackPx);
  pointer-events: none;
  opacity: calc(0.22 - (0.16 * var(--stackProgress)));
  background:
    linear-gradient(to left, rgba(0, 0, 0, 0.14) 0%, rgba(0, 0, 0, 0.02) 70%, transparent 100%),
    linear-gradient(
      to bottom,
      rgba(0, 0, 0, 0.10) 0 1px,
      rgba(255, 255, 255, 0.36) 1px 2px,
      transparent 2px 5px
    ),
    linear-gradient(
      to bottom,
      transparent 0 32%,
      rgba(0, 0, 0, 0.07) 32% 33%,
      transparent 33% 67%,
      rgba(0, 0, 0, 0.06) 67% 68%,
      transparent 68% 100%
    );
  background-size: 100% 100%, 100% 10px, 100% 100%;
  background-repeat: no-repeat, repeat-y, no-repeat;
  z-index: 0;
}

.flipbook::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 1;
  z-index: 1;
}

.flipbook.dir-next::after {
  background: radial-gradient(
    80% 90% at 0% 50%,
    rgba(0,0,0,var(--cast)) 0%,
    rgba(0,0,0,0) 70%
  );
}

.flipbook.dir-prev::after {
  background: radial-gradient(
    80% 90% at 100% 50%,
    rgba(0,0,0,var(--cast)) 0%,
    rgba(0,0,0,0) 70%
  );
}

.base {
  z-index: 0;
  filter: contrast(1.02);
}

.sheet {
  position: absolute;
  inset: 0;
  z-index: 2;
  transform-style: preserve-3d;
  transform: rotateY(0deg);
  filter: drop-shadow(0 18px 26px rgba(0,0,0,var(--liftShadow)));
  will-change: transform;
}

.page-layer {
  position: absolute;
  inset: 0;
  /* Show the entire page image (prevents edge cropping) */
  background-size: contain;
  background-position: center;
  background-repeat: no-repeat;
  background-color: #fff;
}

.face {
  backface-visibility: hidden;
  transform-style: preserve-3d;
}

.front { }

.back {
  transform: rotateY(180deg);
}

.face::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 1;
  transition: opacity 120ms linear, background 120ms linear;
}

/* Directional shading hints */
.flipbook.dir-next .front::after {
  background:
    linear-gradient(to left,
      rgba(0,0,0,var(--shade)) 0%,
      rgba(0,0,0,0) 58%),
    linear-gradient(to right,
      rgba(0,0,0,var(--hinge)) 0%,
      rgba(0,0,0,0) 12%),
    linear-gradient(to left,
      rgba(255,255,255,var(--glint)) 0%,
      rgba(255,255,255,0) 12%);
}
.flipbook.dir-next .back::after {
  background:
    linear-gradient(to left,
      rgba(0,0,0,var(--shade2)) 0%,
      rgba(0,0,0,0) 62%),
    linear-gradient(to right,
      rgba(0,0,0,var(--hinge)) 0%,
      rgba(0,0,0,0) 12%),
    linear-gradient(to right,
      rgba(255,255,255,var(--glint)) 0%,
      rgba(255,255,255,0) 12%);
}

.flipbook.dir-prev .front::after {
  background:
    linear-gradient(to right,
      rgba(0,0,0,var(--shade)) 0%,
      rgba(0,0,0,0) 58%),
    linear-gradient(to left,
      rgba(0,0,0,var(--hinge)) 0%,
      rgba(0,0,0,0) 12%),
    linear-gradient(to right,
      rgba(255,255,255,var(--glint)) 0%,
      rgba(255,255,255,0) 12%);
}
.flipbook.dir-prev .back::after {
  background:
    linear-gradient(to left,
      rgba(0,0,0,var(--shade2)) 0%,
      rgba(0,0,0,0) 62%),
    linear-gradient(to left,
      rgba(0,0,0,var(--hinge)) 0%,
      rgba(0,0,0,0) 12%),
    linear-gradient(to left,
      rgba(255,255,255,var(--glint)) 0%,
      rgba(255,255,255,0) 12%);
}

/* Tap zones (invisible buttons over left/right edges) */
.tapzone {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 18%;
  border: 0;
  padding: 0;
  margin: 0;
  background: transparent;
  cursor: pointer;
  z-index: 3;
  opacity: 0;
  transition: opacity 160ms ease, transform 160ms ease;
}

.tapzone--left { left: 0; }
.tapzone--right { right: 0; }

.tapzone::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 160ms ease;
}

.tapzone--left::before {
  background: linear-gradient(to right, rgba(0,0,0,0.13) 0%, rgba(0,0,0,0.05) 32%, rgba(0,0,0,0) 100%);
}

.tapzone--right::before {
  background: linear-gradient(to left, rgba(0,0,0,0.13) 0%, rgba(0,0,0,0.05) 32%, rgba(0,0,0,0) 100%);
}

.tapzone::after {
  content: "";
  position: absolute;
  top: 50%;
  font-size: 22px;
  line-height: 1;
  font-weight: 700;
  color: rgba(255,255,255,0.92);
  text-shadow: 0 1px 2px rgba(0,0,0,0.3);
  opacity: 0;
  transition: opacity 160ms ease, transform 160ms ease;
}

.tapzone--left::after {
  content: "‹";
  left: 9px;
  transform: translateY(-50%) translateX(-3px);
}

.tapzone--right::after {
  content: "›";
  right: 9px;
  transform: translateY(-50%) translateX(3px);
}

.flipbook.edge-left .tapzone--left,
.flipbook.edge-right .tapzone--right {
  opacity: 1;
}

.flipbook.edge-left .tapzone--left::before,
.flipbook.edge-right .tapzone--right::before,
.flipbook.edge-left .tapzone--left::after,
.flipbook.edge-right .tapzone--right::after {
  opacity: 1;
}

.flipbook.edge-left .tapzone--left::after {
  transform: translateY(-50%) translateX(0);
}

.flipbook.edge-right .tapzone--right::after {
  transform: translateY(-50%) translateX(0);
}

.flipbook.coach .tapzone--right {
  opacity: 1;
}

.flipbook.coach .tapzone--right::before {
  opacity: 1;
}

.flipbook.coach .tapzone--right::after {
  opacity: 1;
  animation: coachNudge 360ms ease-out 0s 3;
}

@keyframes coachNudge {
  0% {
    transform: translateY(-50%) translateX(4px);
  }
  100% {
    transform: translateY(-50%) translateX(0);
  }
}

.controls {
  width: min(920px, 92vw);
  display: grid;
  grid-template-columns: auto 1fr auto;
  min-height: 56px;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
  border-left: 0;
  border-right: 0;
  border-radius: 8px;
  background: color-mix(in srgb, var(--paper-base) 82%, #fff 18%);
  box-shadow:
    0 1px 2px rgba(0, 0, 0, 0.06),
    0 4px 8px rgba(0, 0, 0, 0.05);
}

.btn {
  appearance: none;
  border: 1px solid var(--rule);
  background: color-mix(in srgb, var(--paper-base) 88%, #fff 12%);
  color: var(--ink);
  height: 44px;
  min-width: 44px;
  padding: 0;
  border-radius: 10px;
  cursor: pointer;
  display: inline-grid;
  place-items: center;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  font-weight: 600;
  transition: color 120ms ease, background-color 120ms ease, border-color 120ms ease, transform 90ms ease;
}

.btn__text {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.btn:hover:not(:disabled) {
  color: #111;
  border-color: color-mix(in srgb, var(--rule-strong) 85%, var(--rule) 15%);
  background: color-mix(in srgb, var(--paper-base) 82%, #fff 18%);
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn:focus-visible {
  outline: 3px solid rgba(0,0,0,0.25);
  outline-offset: 2px;
}

.btn__icon {
  font-size: 15px;
}

.status {
  display: grid;
  place-items: center;
  gap: 8px;
  padding: 6px 10px;
}

.status__text {
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.14em;
  font-variant-numeric: tabular-nums;
  text-transform: none;
  color: var(--ink-soft);
  text-align: center;
}

.dots {
  --p: 0;
  --dotHit: 18px;
  --dotPad: calc(var(--dotHit) / 2);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 92px;
  height: var(--dotHit);
}

.dots::after {
  content: "";
  position: absolute;
  top: 50%;
  left: calc(var(--dotPad) + (var(--p) * (100% - var(--dotHit))));
  transform: translate(-50%, -50%);
  width: 10px;
  height: 3px;
  border-radius: 2px;
  background: var(--ink);
  transition: left 180ms ease;
  pointer-events: none;
}

.dot {
  position: relative;
  width: var(--dotHit);
  height: var(--dotHit);
  border: 0;
  padding: 0;
  border-radius: 0;
  background: transparent;
  cursor: pointer;
}

.dot::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 1px;
  height: 8px;
  transform: translate(-50%, -50%);
  background: var(--rule-strong);
  opacity: 0.6;
  border-radius: 0;
}

.dot[aria-selected="true"]::before {
  opacity: 0;
}

.footer {
  display: none;
  width: min(920px, 92vw);
  text-align: center;
  color: var(--muted);
  font-size: 12px;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
}

/* Desktop: fit the entire experience into one viewport (no scrolling). */
@media (min-width: 768px) {
  body { overflow: hidden; }

  .wrap {
    height: calc(var(--vh, 1vh) * 100);
    padding: 14px 14px 16px;
    grid-template-rows: auto 1fr;
    place-items: stretch center;
    gap: 12px;
  }

  .stage {
    height: 100%;
    grid-template-rows: minmax(0, 1fr) auto auto;
    gap: 10px;
  }

  .flipbook-shell {
    height: 100%;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .flipbook {
    height: 100%;
    width: auto;
    max-width: min(92vw, 980px);
  }
}

/* Small screens */
@media (max-width: 520px) {
  .wrap {
    gap: 10px;
    padding: 10px 10px 14px;
  }
  .flipbook-shell { width: 96vw; }
  .footer { display: none; }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
    padding: 6px 40px 6px 8px;
  }
  .brand__title {
    font-size: 26px;
  }
  .hints {
    position: absolute;
    top: 6px;
    right: 8px;
    text-align: right;
  }
  .controls {
    min-height: 52px;
    gap: 10px;
    padding: 9px 10px;
    padding-bottom: calc(9px + env(safe-area-inset-bottom));
    border-radius: 10px;
  }

  .dots {
    width: 76px;
  }

  .flipbook-shell::before,
  .flipbook-shell::after {
    width: 22px;
    height: 22px;
  }
}

/* Reduced motion: use a quick crossfade instead of a flip */
@media (prefers-reduced-motion: reduce) {
  .sheet {
    transition: none !important;
  }
  .flipbook.coach .tapzone--right::after {
    animation: none !important;
  }
  .flipbook-shell::before,
  .flipbook-shell::after {
    transition: opacity 160ms ease !important;
  }
}

@media (hover: hover) and (pointer: fine) {
  .flipbook-shell.can-prev .tapzone--left,
  .flipbook-shell.can-next .tapzone--right {
    opacity: 0;
  }
}

@media (hover: none), (pointer: coarse) {
  .flipbook-shell.can-prev .tapzone--left,
  .flipbook-shell.can-next .tapzone--right {
    opacity: 0.32;
  }

  .flipbook-shell.can-prev .tapzone--left::before,
  .flipbook-shell.can-next .tapzone--right::before,
  .flipbook-shell.can-prev .tapzone--left::after,
  .flipbook-shell.can-next .tapzone--right::after {
    opacity: 0.32;
  }

  .flipbook.edge-left .tapzone--left,
  .flipbook.edge-right .tapzone--right,
  .flipbook.coach .tapzone--right {
    opacity: 1;
  }
}

/* Lightbox (zoomable full-screen view) */
body.no-scroll {
  overflow: hidden;
}

.lightbox {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: calc(14px + env(safe-area-inset-top))
           calc(14px + env(safe-area-inset-right))
           calc(14px + env(safe-area-inset-bottom))
           calc(14px + env(safe-area-inset-left));
  background: rgba(0, 0, 0, 0.62);
  z-index: 9999;
}

.lightbox.is-open {
  display: flex;
}

.lightbox__backdrop {
  position: absolute;
  inset: 0;
}

.lightbox__panel {
  position: relative;
  width: min(1100px, 100%);
  height: min(92vh, 920px);
  background: color-mix(in srgb, var(--paper-base) 90%, #fff 10%);
  border: 1px solid var(--rule);
  border-radius: 4px;
  overflow: hidden;
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.28);
  display: grid;
  grid-template-rows: auto 1fr auto;
}

.lightbox__panel::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.055;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220' viewBox='0 0 220 220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' seed='8'/%3E%3C/filter%3E%3Crect width='220' height='220' filter='url(%23n)' opacity='0.22'/%3E%3C/svg%3E");
  background-size: 220px 220px;
  background-repeat: repeat;
  z-index: 0;
}

.lightbox__bar {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 10px;
  background: color-mix(in srgb, var(--paper-base) 86%, #fff 14%);
  border-bottom: 1px solid var(--frame);
}

.lightbox__title {
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  font-size: 13px;
  color: var(--muted);
}

.lightbox__barRight {
  display: inline-flex;
  gap: 8px;
  align-items: center;
}

.lightbox__nav,
.lightbox__close {
  appearance: none;
  border: 1px solid var(--frame);
  background: color-mix(in srgb, var(--paper-base) 78%, #fff 22%);
  color: var(--ink);
  border-radius: 3px;
  padding: 8px 10px;
  cursor: pointer;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  font-weight: 700;
  line-height: 1;
  transition: color 120ms ease, background-color 120ms ease, border-color 120ms ease;
}

.lightbox__nav:hover:not(:disabled),
.lightbox__close:hover {
  color: #111;
  border-color: var(--rule-strong);
  background: color-mix(in srgb, var(--paper-base) 70%, #fff 30%);
}

.lightbox__nav:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.lightbox__nav:focus-visible,
.lightbox__close:focus-visible {
  outline: 3px solid rgba(0,0,0,0.25);
  outline-offset: 2px;
}

.lightbox__scroller {
  position: relative;
  z-index: 1;
  background: #fff;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  padding: 10px;
  touch-action: pan-x pan-y pinch-zoom;
}

.lightbox__img {
  display: block;
  width: 100%;
  height: auto;
  margin: 0 auto;
  border-radius: 6px;
}

/* Double tap zoom mode: enlarge the image so you can scroll around it. */
.lightbox__scroller.is-zoomed .lightbox__img {
  width: 220%;
  max-width: none;
}

.lightbox__help {
  position: relative;
  z-index: 1;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  font-size: 12px;
  color: var(--muted);
  padding: 10px 12px;
  background: rgba(255, 255, 255, 0.62);
  border-top: 1px solid var(--frame);
  text-align: center;
}

@media (min-width: 900px) {
  .lightbox__help { display: none; }
}