.vbtr-tree-rings-block {
  --vbtr-scale: 1;
  --vbtr-ring-color-rgba: rgba(101, 81, 65, 0.42);
  --vbtr-ring-active-color-rgba: rgba(47, 36, 27, 0.92);
  --vbtr-core-color-rgba: rgba(89, 69, 52, 0.68);
  --vbtr-core-active-color-rgba: rgba(47, 36, 27, 0.95);
  --vbtr-speed: 180ms;
  --vbtr-graphic-height: 100vh;
  --vbtr-content-max: 40ch;
  --vbtr-mobile-hit: 18;
  --vbtr-graphic-width-page: 58vw;
  --vbtr-content-width-page: 42vw;
  padding: 0;
}

.vbtr-tree-rings-grid {
  display: grid;
  grid-template-columns: minmax(300px, 1fr) minmax(280px, 0.9fr);
  gap: 2rem;
  align-items: center;
  min-height: min(100vh, var(--vbtr-graphic-height));
}

.vbtr-tree-rings-block.width-page_split .vbtr-tree-rings-grid {
  grid-template-columns: minmax(20rem, var(--vbtr-graphic-width-page)) minmax(20rem, var(--vbtr-content-width-page));
  gap: 0;
}

.vbtr-tree-rings-block.layout-left_half_bleed {
  min-height: var(--vbtr-graphic-height);
  display: flex;
  align-items: stretch;
}

.vbtr-tree-rings-block.layout-left_half_bleed .vbtr-tree-rings-grid {
  width: 100%;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 0;
  align-items: stretch;
}

.vbtr-tree-rings-block.layout-left_half_bleed.width-page_split .vbtr-tree-rings-grid {
  grid-template-columns: var(--vbtr-graphic-width-page) var(--vbtr-content-width-page);
}

.vbtr-tree-rings-block.layout-half_page_vertical .vbtr-tree-rings-grid,
.vbtr-editor-preview.layout-half_page_vertical .vbtr-editor-stage {
  grid-template-columns: 1fr;
  align-items: start;
}

.vbtr-tree-rings-block.layout-full_page {
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.vbtr-tree-rings-block.layout-full_page .vbtr-tree-rings-grid,
.vbtr-editor-preview.layout-full_page .vbtr-editor-stage {
  width: 100%;
  min-height: 100vh;
}

.vbtr-graphic-wrap {
  display: flex;
  justify-content: flex-start;
  align-items: stretch;
  overflow: hidden;
}

.vbtr-tree-rings-block.layout-left_half_bleed .vbtr-graphic-wrap {
  min-height: var(--vbtr-graphic-height);
}

.vbtr-graphic {
  width: min(100%, 720px);
  aspect-ratio: 1 / 1;
  transform: scale(var(--vbtr-scale));
  transform-origin: left center;
}

.vbtr-tree-rings-block.layout-left_half_bleed .vbtr-graphic,
.vbtr-tree-rings-block.layout-full_page .vbtr-graphic,
.vbtr-tree-rings-block.layout-half_page_vertical .vbtr-graphic {
  height: var(--vbtr-graphic-height);
  width: auto;
  min-width: 100%;
  aspect-ratio: 1 / 2;
  transform-origin: left center;
}

.vbtr-svg {
  width: 100%;
  height: 100%;
  display: block;
  overflow: visible;
}

.vbtr-ring-group,
.vbtr-core-group {
  cursor: pointer;
  outline: none;
}

.vbtr-ring-line,
.vbtr-core-line,
.vbtr-ring-hit,
.vbtr-core-hit {
  transition: stroke var(--vbtr-speed) ease, opacity var(--vbtr-speed) ease, filter var(--vbtr-speed) ease;
  vector-effect: non-scaling-stroke;
}

.vbtr-ring-line {
  fill: none;
  stroke: var(--vbtr-ring-color-rgba);
  stroke-width: 0.3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.vbtr-ring-hit {
  fill: none;
  stroke: transparent;
  stroke-width: 8;
  pointer-events: stroke;
}

.vbtr-ring-group:hover .vbtr-ring-line,
.vbtr-ring-group:focus .vbtr-ring-line,
.vbtr-ring-group.is-active .vbtr-ring-line {
  stroke: var(--vbtr-ring-active-color-rgba);
  stroke-width: 0.54;
  filter: drop-shadow(0 0 0.12px color-mix(in srgb, var(--vbtr-ring-active-color-rgba) 14%, transparent));
}

.vbtr-core-line {
  fill: none;
  stroke: var(--vbtr-core-color-rgba);
  stroke-width: 0.44;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.vbtr-core-hit {
  fill: none;
  stroke: transparent;
  stroke-width: 9.2;
  pointer-events: stroke;
}

.vbtr-core-group:hover .vbtr-core-line,
.vbtr-core-group:focus .vbtr-core-line,
.vbtr-core-group.is-active .vbtr-core-line {
  stroke: var(--vbtr-core-active-color-rgba);
  stroke-width: 0.72;
  filter: drop-shadow(0 0 0.14px color-mix(in srgb, var(--vbtr-ring-active-color-rgba) 16%, transparent));
}

.vbtr-content {
  max-width: var(--vbtr-content-max);
  padding: 2.25rem 2rem 2.25rem 1.5rem;
  align-self: center;
}

.vbtr-tree-rings-block.layout-left_half_bleed.width-page_split .vbtr-content,
.vbtr-tree-rings-block.layout-full_page.width-page_split .vbtr-content {
  max-width: none;
}

.vbtr-eyebrow,
.vbtr-item-year {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.75rem;
}

.vbtr-title {
  margin: 0.25rem 0 0.75rem;
}

.vbtr-intro {
  margin: 0 0 1.25rem;
  max-width: var(--vbtr-content-max);
}

.vbtr-panel {
  position: relative;
  min-height: 10rem;
}

.vbtr-item {
  display: none;
}

.vbtr-item.is-active {
  display: block;
}

.vbtr-item-label {
  margin: 0.2rem 0 0.5rem;
}

.vbtr-item-description {
  margin: 0;
  max-width: var(--vbtr-content-max);
}

.vbtr-mobile-list {
  display: none;
  margin-top: 1rem;
}

.vbtr-mobile-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.vbtr-mobile-button {
  appearance: none;
  border: 1px solid rgba(0,0,0,0.12);
  background: transparent;
  border-radius: 999px;
  padding: 0.6rem 0.85rem;
  line-height: 1.2;
  cursor: pointer;
}

.vbtr-mobile-button.is-active {
  border-color: rgba(0,0,0,0.38);
}

.vbtr-editor-preview {
  padding: 1rem;
  border: 1px solid #ddd;
  border-radius: 8px;
}

.vbtr-editor-stage {
  display: grid;
  grid-template-columns: minmax(220px, 320px) 1fr;
  gap: 1rem;
  align-items: center;
}

.vbtr-editor-preview.layout-left_half_bleed .vbtr-editor-stage {
  grid-template-columns: 1.1fr 0.9fr;
  gap: 0;
}

.vbtr-editor-preview.width-page_split .vbtr-editor-stage {
  grid-template-columns: var(--vbtr-graphic-width-page) var(--vbtr-content-width-page);
}

.vbtr-editor-graphic {
  width: min(100%, 420px);
  aspect-ratio: 1 / 2;
  min-height: 26rem;
  margin: 0 auto 0 0;
  transform: scale(var(--vbtr-scale));
  transform-origin: left center;
  overflow: hidden;
}

.vbtr-editor-row + .vbtr-editor-row {
  margin-top: 0.5rem;
}

.vbtr-editor-core-row {
  margin-bottom: 0.85rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid rgba(0,0,0,0.08);
}

@media (max-width: 900px) {
  .vbtr-tree-rings-grid,
  .vbtr-editor-stage,
  .vbtr-tree-rings-block.layout-full_page .vbtr-tree-rings-grid,
  .vbtr-editor-preview.layout-full_page .vbtr-editor-stage,
  .vbtr-tree-rings-block.layout-left_half_bleed .vbtr-tree-rings-grid,
  .vbtr-editor-preview.layout-left_half_bleed .vbtr-editor-stage,
  .vbtr-tree-rings-block.width-page_split .vbtr-tree-rings-grid,
  .vbtr-editor-preview.width-page_split .vbtr-editor-stage {
    grid-template-columns: 1fr;
  }

  .vbtr-graphic,
  .vbtr-tree-rings-block.layout-left_half_bleed .vbtr-graphic,
  .vbtr-tree-rings-block.layout-full_page .vbtr-graphic,
  .vbtr-tree-rings-block.layout-half_page_vertical .vbtr-graphic {
    width: min(100%, 92vw);
    min-width: 0;
    height: auto;
    aspect-ratio: 1 / 1;
    transform-origin: center;
  }

  .vbtr-content {
    padding: 1.25rem 1rem 2rem;
  }

  .vbtr-ring-hit {
    stroke-width: calc(var(--vbtr-mobile-hit) * 1px);
  }

  .vbtr-core-hit {
    stroke-width: calc((var(--vbtr-mobile-hit) + 2) * 1px);
  }

  .vbtr-mobile-list {
    display: block;
  }
}

@media (prefers-reduced-motion: reduce) {
  .vbtr-ring-line,
  .vbtr-core-line,
  .vbtr-ring-hit,
  .vbtr-core-hit {
    transition: none;
  }
}


/* Automatic mobile text-first behavior */
.vbtr-mobile-list-primary {
  display: none;
}

@media (max-width: 900px) {
  .vbtr-tree-rings-block.layout-left_half_bleed {
    min-height: auto;
  }

  .vbtr-tree-rings-block.layout-left_half_bleed .vbtr-tree-rings-grid,
  .vbtr-tree-rings-block.layout-standard .vbtr-tree-rings-grid,
  .vbtr-tree-rings-block.layout-full_page .vbtr-tree-rings-grid,
  .vbtr-tree-rings-block.layout-half_page_vertical .vbtr-tree-rings-grid {
    grid-template-columns: 1fr;
    grid-template-areas:
      "content"
      "graphic";
    min-height: auto;
    gap: 0.5rem;
  }

  .vbtr-content {
    order: 1;
    max-width: none;
    padding: 1.25rem 1rem 0.5rem;
  }

  .vbtr-mobile-list-primary {
    display: block;
    margin: 0.9rem 0 1rem;
  }

  .vbtr-panel {
    min-height: 0;
  }

  .vbtr-graphic-wrap {
    order: 2;
    justify-content: center;
    align-items: flex-start;
    min-height: 0;
    padding: 0 1rem 1.25rem;
  }

  .vbtr-graphic,
  .vbtr-tree-rings-block.layout-left_half_bleed .vbtr-graphic,
  .vbtr-tree-rings-block.layout-full_page .vbtr-graphic,
  .vbtr-tree-rings-block.layout-half_page_vertical .vbtr-graphic {
    width: min(100%, 26rem);
    min-width: 0;
    height: auto;
    max-height: 44svh;
    aspect-ratio: 1 / 1;
    transform-origin: center;
    margin: 0 auto;
  }

  .vbtr-svg.vbtr-svg-half {
    view-transition-name: none;
  }

  .vbtr-mobile-button {
    min-height: 2.5rem;
    padding: 0.7rem 0.95rem;
    font-size: 0.95rem;
  }
}

@media (max-width: 600px) {
  .vbtr-content {
    padding: 1rem 0.875rem 0.25rem;
  }

  .vbtr-graphic-wrap {
    padding: 0 0.875rem 1rem;
  }

  .vbtr-graphic,
  .vbtr-tree-rings-block.layout-left_half_bleed .vbtr-graphic,
  .vbtr-tree-rings-block.layout-full_page .vbtr-graphic,
  .vbtr-tree-rings-block.layout-half_page_vertical .vbtr-graphic {
    width: min(100%, 22rem);
    max-height: 36svh;
  }

  .vbtr-intro,
  .vbtr-item-description {
    max-width: none;
  }
}


/* Automatic mobile stepper interaction */
.vbtr-mobile-stepper {
  display: none;
}

.vbtr-stepper-button {
  appearance: none;
  border: 1px solid rgba(0,0,0,0.12);
  background: transparent;
  border-radius: 999px;
  width: 2.75rem;
  height: 2.75rem;
  font-size: 1.3rem;
  line-height: 1;
  cursor: pointer;
  flex: 0 0 auto;
}

.vbtr-stepper-button:disabled {
  opacity: 0.35;
  cursor: default;
}

.vbtr-stepper-status {
  min-width: 0;
  flex: 1 1 auto;
  text-align: center;
}

.vbtr-stepper-kicker {
  margin: 0 0 0.2rem;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.62;
}

.vbtr-stepper-label {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.2;
}

@media (max-width: 900px) {
  .vbtr-mobile-stepper {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 0.9rem 0 1rem;
  }

  .vbtr-mobile-list-primary {
    display: none !important;
  }

  .vbtr-panel {
    padding-top: 0.15rem;
  }

  .vbtr-graphic-wrap {
    touch-action: pan-y;
  }

  .vbtr-panel {
    touch-action: pan-y;
  }
}


/* v2.3 hard-disable pill navigation on mobile and desktop */
.vbtr-mobile-list,
.vbtr-mobile-list-primary,
.vbtr-mobile-buttons,
.vbtr-mobile-button {
  display: none !important;
}

@media (max-width: 900px) {
  .vbtr-mobile-list,
  .vbtr-mobile-list-primary,
  .vbtr-mobile-buttons,
  .vbtr-mobile-button {
    display: none !important;
  }

  .vbtr-mobile-stepper {
    display: flex !important;
  }
}


/* v2.4 mobile interaction: native select only */
.vbtr-mobile-stepper,
.vbtr-stepper-button,
.vbtr-stepper-status,
.vbtr-stepper-kicker,
.vbtr-stepper-label {
  display: none !important;
}

.vbtr-mobile-select-wrap {
  display: none;
}

.vbtr-mobile-select-label {
  display: block;
  margin: 0 0 0.45rem;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.64;
}

.vbtr-mobile-select {
  display: block;
  width: 100%;
  appearance: auto;
  font: inherit;
  line-height: 1.25;
  padding: 0.8rem 0.9rem;
  border: 1px solid rgba(0,0,0,0.14);
  border-radius: 0.75rem;
  background: transparent;
}

@media (max-width: 900px) {
  .vbtr-mobile-select-wrap {
    display: block;
    margin: 0.9rem 0 1rem;
  }

  .vbtr-mobile-list,
  .vbtr-mobile-list-primary,
  .vbtr-mobile-buttons,
  .vbtr-mobile-button,
  .vbtr-mobile-stepper {
    display: none !important;
  }
}


/* v2.5 mobile ring-led annotation interaction */
.vbtr-mobile-select-wrap,
.vbtr-mobile-select,
.vbtr-mobile-select-label {
  display: none !important;
}

.vbtr-mobile-annotation {
  display: none;
}

@media (max-width: 900px) {
  .vbtr-graphic-wrap {
    overflow: visible;
  }

  .vbtr-graphic {
    position: relative;
    width: min(100%, 28rem);
    max-height: 56svh;
    transform: scale(calc(var(--vbtr-scale) * 1.08));
  }

  .vbtr-ring-line {
    stroke-width: 0.44;
  }

  .vbtr-core-line {
    stroke-width: 0.62;
  }

  .vbtr-ring-hit {
    stroke-width: calc((var(--vbtr-mobile-hit) + 10) * 1px);
  }

  .vbtr-core-hit {
    stroke-width: calc((var(--vbtr-mobile-hit) + 12) * 1px);
  }

  .vbtr-mobile-annotation {
    display: block;
    position: absolute;
    inset: 0;
    pointer-events: none;
    --vbtr-annotation-x: 48px;
    --vbtr-annotation-y: 96px;
  }

  .vbtr-mobile-annotation-line {
    position: absolute;
    left: var(--vbtr-annotation-x);
    top: var(--vbtr-annotation-y);
    width: clamp(2.75rem, 18vw, 4.75rem);
    height: 1px;
    background: var(--vbtr-ring-active-color-rgba);
    transform-origin: left center;
    transform: scaleX(0);
    opacity: 0;
    transition: transform var(--vbtr-speed) ease, opacity var(--vbtr-speed) ease;
  }

  .vbtr-mobile-annotation-card {
    position: absolute;
    left: calc(var(--vbtr-annotation-x) + clamp(2.75rem, 18vw, 4.75rem) + 0.5rem);
    top: calc(var(--vbtr-annotation-y) - 2.35rem);
    width: min(12.5rem, calc(100% - var(--vbtr-annotation-x) - 4.5rem));
    padding: 0.55rem 0.7rem 0.65rem;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(4px);
    border: 1px solid rgba(0,0,0,0.08);
    border-radius: 0.75rem;
    opacity: 0;
    transform: translateY(4px);
    transition: opacity var(--vbtr-speed) ease, transform var(--vbtr-speed) ease;
    box-shadow: 0 6px 16px rgba(0,0,0,0.06);
  }

  .vbtr-mobile-annotation.is-active .vbtr-mobile-annotation-line {
    transform: scaleX(1);
    opacity: 1;
  }

  .vbtr-mobile-annotation.is-active .vbtr-mobile-annotation-card {
    opacity: 1;
    transform: translateY(0);
  }

  .vbtr-mobile-annotation-year {
    margin: 0 0 0.2rem;
    font-size: 0.66rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    opacity: 0.66;
  }

  .vbtr-mobile-annotation-label {
    margin: 0 0 0.3rem;
    font-size: 0.95rem;
    line-height: 1.15;
  }

  .vbtr-mobile-annotation-description {
    margin: 0;
    font-size: 0.78rem;
    line-height: 1.35;
  }

  .vbtr-panel {
    display: none;
  }
}

@media (max-width: 600px) {
  .vbtr-graphic {
    width: min(100%, 23rem);
    max-height: 48svh;
    transform: scale(calc(var(--vbtr-scale) * 1.12));
  }

  .vbtr-mobile-annotation-card {
    width: min(11rem, calc(100% - var(--vbtr-annotation-x) - 3.75rem));
    left: calc(var(--vbtr-annotation-x) + clamp(2rem, 14vw, 3.5rem) + 0.45rem);
    top: calc(var(--vbtr-annotation-y) - 2.2rem);
    padding: 0.5rem 0.6rem 0.58rem;
  }

  .vbtr-mobile-annotation-line {
    width: clamp(2rem, 14vw, 3.5rem);
  }

  .vbtr-mobile-annotation-description {
    font-size: 0.74rem;
  }
}


/* v2.6 mobile layout preferences */
.vbtr-tree-rings-block {
  --vbtr-mobile-graphic-scale: 1.12;
  --vbtr-mobile-graphic-max-height: 48vh;
  --vbtr-mobile-annotation-width: 11rem;
}

@media (max-width: 900px) {
  .vbtr-tree-rings-block.mobile-text-annotation_overlay .vbtr-panel {
    display: none;
  }

  .vbtr-tree-rings-block.mobile-text-panel_below .vbtr-panel,
  .vbtr-tree-rings-block.mobile-text-panel_above .vbtr-panel {
    display: block;
    min-height: 0;
  }

  .vbtr-tree-rings-block.mobile-text-panel_below .vbtr-mobile-annotation,
  .vbtr-tree-rings-block.mobile-text-panel_above .vbtr-mobile-annotation {
    display: none !important;
  }

  .vbtr-tree-rings-block.mobile-text-panel_above .vbtr-tree-rings-grid {
    grid-template-areas:
      "content"
      "graphic";
  }

  .vbtr-tree-rings-block.mobile-text-panel_below .vbtr-tree-rings-grid {
    grid-template-areas:
      "graphic"
      "content";
  }

  .vbtr-tree-rings-block.mobile-text-panel_below .vbtr-content,
  .vbtr-tree-rings-block.mobile-text-panel_above .vbtr-content {
    order: 2;
    padding-top: 0.85rem;
  }

  .vbtr-tree-rings-block.mobile-text-panel_above .vbtr-content {
    order: 1;
    padding-top: 1rem;
    padding-bottom: 0.5rem;
  }

  .vbtr-tree-rings-block.mobile-text-panel_below .vbtr-graphic-wrap {
    order: 1;
    padding-bottom: 0.4rem;
  }

  .vbtr-tree-rings-block.mobile-text-panel_above .vbtr-graphic-wrap {
    order: 2;
    padding-top: 0.35rem;
  }

  .vbtr-graphic {
    transform: scale(var(--vbtr-mobile-graphic-scale));
    max-height: var(--vbtr-mobile-graphic-max-height);
  }

  .vbtr-mobile-annotation-card {
    width: min(var(--vbtr-mobile-annotation-width), calc(100% - var(--vbtr-annotation-x) - 4.5rem));
    max-width: calc(100% - var(--vbtr-annotation-x) - 1rem);
  }
}

@media (max-width: 600px) {
  .vbtr-graphic {
    max-height: var(--vbtr-mobile-graphic-max-height);
  }

  .vbtr-mobile-annotation-card {
    width: min(var(--vbtr-mobile-annotation-width), calc(100% - var(--vbtr-annotation-x) - 3.75rem));
  }
}


/* v3.0 dynamic scroll story mode */
.vbtr-scroll-story {
  display: none;
}

.vbtr-tree-rings-block.interaction-scroll_story .vbtr-panel {
  display: none !important;
}

.vbtr-tree-rings-block.interaction-scroll_story .vbtr-mobile-annotation {
  display: none !important;
}

.vbtr-tree-rings-block.interaction-scroll_story .vbtr-scroll-story {
  display: block;
  position: relative;
}

.vbtr-tree-rings-block.interaction-scroll_story .vbtr-scroll-sticky {
  position: sticky;
  top: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 2rem 0;
}

.vbtr-tree-rings-block.interaction-scroll_story .vbtr-scroll-copy {
  position: relative;
  width: 100%;
  max-width: var(--vbtr-content-max);
  min-height: 12rem;
}

.vbtr-tree-rings-block.interaction-scroll_story .vbtr-scroll-item {
  position: absolute;
  inset: 0;
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--vbtr-speed) ease, transform var(--vbtr-speed) ease;
  pointer-events: none;
}

.vbtr-tree-rings-block.interaction-scroll_story .vbtr-scroll-item.is-active {
  position: relative;
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.vbtr-tree-rings-block.interaction-scroll_story .vbtr-scroll-track {
  position: relative;
}

.vbtr-tree-rings-block.interaction-scroll_story .vbtr-scroll-step {
  height: var(--vbtr-scroll-step);
}

.vbtr-tree-rings-block.interaction-scroll_story .vbtr-graphic-wrap {
  position: sticky;
  top: 0;
  min-height: 100vh;
  align-self: start;
}

.vbtr-tree-rings-block.interaction-scroll_story .vbtr-graphic {
  height: 100vh;
}

@media (max-width: 900px) {
  .vbtr-tree-rings-block.interaction-scroll_story .vbtr-tree-rings-grid {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .vbtr-tree-rings-block.interaction-scroll_story .vbtr-graphic-wrap {
    position: sticky;
    top: 0;
    order: 1;
    padding: 0;
    min-height: 100vh;
    z-index: 1;
    background: transparent;
  }

  .vbtr-tree-rings-block.interaction-scroll_story .vbtr-content {
    order: 2;
    padding: 0;
    max-width: none;
  }

  .vbtr-tree-rings-block.interaction-scroll_story .vbtr-scroll-sticky {
    min-height: 100vh;
    padding: 2rem 1rem;
    align-items: end;
  }

  .vbtr-tree-rings-block.interaction-scroll_story .vbtr-scroll-copy {
    max-width: min(22rem, 100%);
    background: rgba(255,255,255,0.88);
    backdrop-filter: blur(6px);
    border: 1px solid rgba(0,0,0,0.08);
    border-radius: 0.9rem;
    padding: 0.9rem 1rem 1rem;
    box-shadow: 0 10px 24px rgba(0,0,0,0.07);
  }

  .vbtr-tree-rings-block.interaction-scroll_story .vbtr-graphic {
    width: 100%;
    max-height: none;
    height: 100vh;
    aspect-ratio: auto;
    transform: scale(var(--vbtr-mobile-graphic-scale));
  }

  .vbtr-tree-rings-block.interaction-scroll_story .vbtr-ring-hit {
    stroke-width: calc((var(--vbtr-mobile-hit) + 4) * 1px);
  }

  .vbtr-tree-rings-block.interaction-scroll_story .vbtr-core-hit {
    stroke-width: calc((var(--vbtr-mobile-hit) + 6) * 1px);
  }
}


/* v3.1 richer transitions */
.vbtr-tree-rings-block {
  --vbtr-transition-strength: 1;
}

.vbtr-tree-rings-block .vbtr-ring-line,
.vbtr-tree-rings-block .vbtr-core-line {
  transition:
    stroke var(--vbtr-speed) ease,
    opacity var(--vbtr-speed) ease,
    filter var(--vbtr-speed) ease,
    transform calc(var(--vbtr-speed) * 1.15) cubic-bezier(.22,.61,.36,1);
  transform-origin: center;
  transform-box: fill-box;
}

.vbtr-tree-rings-block.transition-growth_fade .vbtr-ring-group .vbtr-ring-line,
.vbtr-tree-rings-block.transition-growth_fade .vbtr-core-group .vbtr-core-line {
  opacity: 0.45;
  transform: scale(calc(1 - (0.04 * var(--vbtr-transition-strength))));
}

.vbtr-tree-rings-block.transition-growth_fade .vbtr-ring-group.is-active .vbtr-ring-line,
.vbtr-tree-rings-block.transition-growth_fade .vbtr-core-group.is-active .vbtr-core-line {
  opacity: 1;
  transform: scale(calc(1 + (0.035 * var(--vbtr-transition-strength))));
}

.vbtr-tree-rings-block.transition-slide_fade .vbtr-scroll-item,
.vbtr-tree-rings-block.transition-growth_fade .vbtr-scroll-item,
.vbtr-tree-rings-block.transition-soft_fade .vbtr-scroll-item {
  will-change: opacity, transform;
}

.vbtr-tree-rings-block.transition-growth_fade .vbtr-scroll-item {
  transform: translateY(calc(22px * var(--vbtr-transition-strength))) scale(calc(0.985 - (0.01 * var(--vbtr-transition-strength))));
}

.vbtr-tree-rings-block.transition-growth_fade .vbtr-scroll-item.is-active {
  transform: translateY(0) scale(1);
}

.vbtr-tree-rings-block.transition-slide_fade.dir-forward .vbtr-scroll-item {
  transform: translateY(calc(28px * var(--vbtr-transition-strength)));
}

.vbtr-tree-rings-block.transition-slide_fade.dir-backward .vbtr-scroll-item {
  transform: translateY(calc(-28px * var(--vbtr-transition-strength)));
}

.vbtr-tree-rings-block.transition-slide_fade .vbtr-scroll-item.is-active {
  transform: translateY(0);
}

.vbtr-tree-rings-block.transition-soft_fade .vbtr-scroll-item {
  transform: translateY(calc(10px * var(--vbtr-transition-strength)));
  opacity: 0;
}

.vbtr-tree-rings-block.transition-soft_fade .vbtr-scroll-item.is-active {
  transform: translateY(0);
  opacity: 1;
}

.vbtr-tree-rings-block.interaction-scroll_story .vbtr-scroll-item {
  transition:
    opacity calc(var(--vbtr-speed) * 1.05) ease,
    transform calc(var(--vbtr-speed) * 1.2) cubic-bezier(.22,.61,.36,1);
}

.vbtr-tree-rings-block.interaction-scroll_story .vbtr-scroll-copy::after {
  content: "";
  position: absolute;
  inset: auto 0 -0.75rem 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0,0,0,0.08), transparent);
  opacity: 0.6;
}

@media (prefers-reduced-motion: reduce) {
  .vbtr-tree-rings-block .vbtr-ring-line,
  .vbtr-tree-rings-block .vbtr-core-line,
  .vbtr-tree-rings-block .vbtr-scroll-item {
    transition: none !important;
    transform: none !important;
  }
}