/* Diagnostics v7: ElevenLabs-style case study (rails, grid, white space) */

body.study--diagnostics,
body.study--studio,
body.study--sellerapp {
  background: var(--paper);
  padding-top: var(--header-offset);

  /* ElevenLabs study tokens */
  --study-canvas: var(--paper);
  --study-heading: var(--heading-color);
  --study-heading-soft: var(--heading-color);
  --study-tag: var(--ink-soft);
  --study-tag-num: var(--ink-soft);
  --study-stage: var(--surface-stage);
  --study-card: var(--surface-card);
  --study-card-muted: var(--surface-muted);
  --study-card-border: var(--border-subtle);
  --study-hairline: var(--hairline);
  --study-radius-lg: 24px;
  --study-radius-md: 13px;
  --study-radius-sm: 12px;
  --study-section-gap: var(--section-pt);
  --study-block-gap: var(--block-gap);
}

.study-rails {
  margin-top: 0;
}

.study-shell {
  width: 100%;
  max-width: var(--page-max);
  margin-inline: auto;
  padding: 0 var(--section-px) var(--section-pb-lg);
  --study-bleed: var(--section-px);
}

/* Study rail dividers: full-bleed hairline with end dots */
.page-rails.study-rails .section + .section,
.page-rails.study-rails .study-article,
.page-rails.study-rails .nextstudy,
.page-rails.study-rails .sitefooter,
.page-rails.study-rails .study-product {
  position: relative;
}

.page-rails.study-rails .section + .section,
.page-rails.study-rails .nextstudy,
.page-rails.study-rails .sitefooter,
.page-rails.study-rails .study-product,
.page-rails.study-rails .study-article {
  margin-inline: calc(-1 * var(--study-bleed));
  padding-inline: var(--study-bleed);
}

.page-rails.study-rails .section {
  position: relative;
}

.page-rails.study-rails .section + .section::before,
.page-rails.study-rails .section + .section::after,
.page-rails.study-rails .study-article::before,
.page-rails.study-rails .study-article::after,
.page-rails.study-rails .nextstudy::before,
.page-rails.study-rails .nextstudy::after,
.page-rails.study-rails .sitefooter::before,
.page-rails.study-rails .sitefooter::after,
.page-rails.study-rails .study-product::before,
.page-rails.study-rails .study-product::after {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: var(--study-canvas);
  background-image: radial-gradient(circle, var(--ink) 1px, transparent 1px);
  z-index: 2;
  pointer-events: none;
}

.page-rails.study-rails .section + .section::before,
.page-rails.study-rails .study-article::before,
.page-rails.study-rails .nextstudy::before,
.page-rails.study-rails .sitefooter::before {
  left: 0;
  transform: translate(-50%, -50%);
}

.page-rails.study-rails .section + .section::after,
.page-rails.study-rails .study-article::after,
.page-rails.study-rails .nextstudy::after,
.page-rails.study-rails .sitefooter::after {
  right: 0;
  transform: translate(50%, -50%);
}

.page-rails.study-rails .section + .section::before,
.page-rails.study-rails .section + .section::after,
.page-rails.study-rails .study-article::before,
.page-rails.study-rails .study-article::after,
.page-rails.study-rails .nextstudy::before,
.page-rails.study-rails .nextstudy::after,
.page-rails.study-rails .sitefooter::before,
.page-rails.study-rails .sitefooter::after {
  top: 0;
}

.page-rails.study-rails .study-product::before,
.page-rails.study-rails .study-product::after {
  top: auto;
  bottom: 0;
}

.page-rails.study-rails .study-product::before {
  left: 0;
  transform: translate(-50%, 50%);
}

.page-rails.study-rails .study-product::after {
  right: 0;
  transform: translate(50%, 50%);
}

.page-rails.study-rails .section + .section {
  margin-top: var(--study-section-gap);
  padding-top: var(--study-section-gap);
  border-top: 1px solid var(--study-hairline);
}

.page-rails.study-rails .study-article {
  margin-top: var(--study-section-gap);
  padding-top: var(--study-section-gap);
  border-top: 1px solid var(--study-hairline);
}

/* Back button: match photography page top spacing */
body.study--diagnostics main#main,
body.study--studio main#main,
body.study--sellerapp main#main {
  padding-top: clamp(96px, 14vw, 132px);
}

/* Product context: what Whatfix does */
.study-product {
  margin: 0 0 var(--study-block-gap);
  padding-bottom: var(--study-section-gap);
  border-bottom: 1px solid var(--study-hairline);
}

.study-product__intro {
  max-width: 768px;
  margin: 0 0 var(--block-gap);
}

.study-product__label {
  margin: 0 0 var(--sp-3);
  font-family: var(--sans);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-medium);
  color: var(--ink-soft);
  letter-spacing: var(--track-body);
}

.study-product__title {
  margin: 0 0 var(--sp-4);
  font-size: clamp(28px, 2.2vw, 32px);
  font-weight: var(--fw-regular);
  letter-spacing: -0.02em;
  line-height: 1.17;
  color: var(--study-heading);
}

.study-product__lede {
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.55;
  color: var(--ink-desc);
  max-width: 65ch;
}

.study-product__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--sp-4);
}

.study-product__card {
  margin: 0;
  padding: clamp(24px, 3vw, 40px);
  background: var(--study-card);
  border: 1px solid var(--study-card-border);
  border-radius: var(--study-radius-lg);
}

.study-product__card img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 12px;
  background: #FFFFFF;
  cursor: zoom-in;
}

.study-product__card figcaption {
  margin-top: var(--sp-4);
  font-size: var(--fs-body-sm);
  line-height: 1.45;
  color: var(--ink-desc);
}

.study-product__card figcaption strong:first-child {
  display: block;
  margin-bottom: 4px;
  font-size: var(--fs-body);
  font-weight: var(--fw-medium);
  color: var(--study-heading);
}

.study-product__card figcaption strong {
  color: var(--ink);
  font-weight: var(--fw-medium);
}

.study-product--visual .study-product__grid {
  margin-bottom: var(--block-gap);
}

.study-product--visual .study-product__intro {
  max-width: 56ch;
}

/* Intro blocks */
.intro-blocks {
  display: grid;
  gap: var(--sp-5);
  margin-bottom: var(--sp-8);
  max-width: 720px;
}

.intro-blocks .the-bet {
  margin-bottom: 0;
}

.intro-blocks .team-credit {
  margin-bottom: 0;
}

/* Visual scan layout */
.section-header--wide {
  max-width: none;
}

.section-header--wide h2 {
  max-width: 18ch;
}

.prose--aside {
  max-width: 56ch;
  margin-bottom: var(--study-block-gap);
  padding: 0;
  background: none;
  border-radius: 0;
  border: none;
}

.prose--aside p {
  font-size: var(--fs-body);
  line-height: 1.6;
}

.prose--callout {
  max-width: 56ch;
  margin: var(--block-gap) 0;
  padding-left: var(--sp-5);
  border-left: 2px solid var(--ink);
}

.prose--callout p {
  font-size: var(--fs-body);
  line-height: 1.6;
}

.prose--follow {
  max-width: 56ch;
  margin: var(--block-gap) 0 0;
}

.prose--follow p {
  font-size: var(--fs-body);
  line-height: 1.6;
  color: var(--ink-desc);
}

.prose--follow strong {
  color: var(--ink);
}

.visual-band {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  gap: var(--grid-gap);
  align-items: start;
  margin: var(--block-gap) 0;
}

.visual-band--reverse {
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
}

.visual-band__media {
  margin: 0;
}

.visual-band__media.doc-figure {
  padding: clamp(20px, 2.5vw, 32px);
}

.visual-band__text {
  margin: 0;
  align-self: center;
}

.hero-number--stat {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
  max-width: 640px;
  margin: var(--block-gap) 0;
  padding: clamp(28px, 4vw, 40px) 0;
  background: none;
  border: none;
  border-radius: 0;
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.hero-number--stat .figure {
  font-size: clamp(64px, 10vw, 96px);
  font-weight: var(--fw-light);
  letter-spacing: -0.04em;
  color: var(--study-heading);
  line-height: 0.9;
}

.hero-number--stat .figure-label {
  font-size: clamp(17px, 1.5vw, 19px);
  line-height: 1.45;
  color: var(--ink);
  max-width: 36ch;
  margin: 0;
}

.doc-figure--feature {
  padding: clamp(20px, 2.5vw, 36px);
}

/* Hero showcase: matches homepage triple stage */
.study-showcase {
  margin: 0 0 var(--stage-gap);
}

.study-showcase__inner {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--triple-showcase-inset);
  align-items: end;
  justify-items: stretch;
  padding: var(--triple-showcase-inset) var(--triple-showcase-inset) 0;
  background: var(--study-stage);
  border: 1px solid var(--study-card-border);
  border-radius: var(--study-radius-lg);
  overflow: hidden;
  width: 100%;
}

.study-showcase__shot {
  margin: 0;
  padding: 0;
  background: var(--study-stage);
  border-radius: var(--triple-showcase-panel-radius) var(--triple-showcase-panel-radius) 0 0;
  overflow: hidden;
  line-height: 0;
  display: block;
  align-self: end;
  width: 100%;
  height: calc(var(--showcase-stage-height) - var(--triple-showcase-inset));
}

.study-showcase__shot img {
  display: block;
  width: 100%;
  height: auto;
  max-height: none;
  object-fit: unset;
  object-position: top;
}

.study-showcase__inner--hero {
  grid-template-columns: 1fr;
  justify-items: stretch;
}

.study-showcase__inner--hero .study-showcase__shot {
  align-self: end;
  background: transparent;
}

.study-showcase__inner--hero .study-showcase__shot img {
  width: 100%;
  height: auto;
  max-height: none;
  object-fit: unset;
  object-position: top;
}

.study-showcase__credit {
  display: block;
  margin-top: var(--sp-3);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-regular);
  color: var(--ink-desc);
  text-align: right;
}

/* Title block */
.study-title {
  max-width: 768px;
  margin: 0 0 var(--sp-5);
}

.study-title .badge {
  display: inline-block;
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-medium);
  color: var(--ink-desc);
  letter-spacing: 0.02em;
  margin-bottom: var(--intro-headline-gap);
}

.study-title .badge::before {
  display: none;
}

.study-title h1 {
  font-size: clamp(28px, 2.5vw, 36px);
  font-weight: var(--fw-regular);
  letter-spacing: -0.025em;
  line-height: 1.2;
  color: var(--study-heading);
  margin: 0 0 var(--intro-headline-gap);
  max-width: 24ch;
  text-wrap: balance;
}

.study-title__name {
  font-weight: var(--fw-semibold);
  color: var(--study-heading);
}

.study-title__sep {
  font-weight: var(--fw-regular);
  color: var(--study-tag);
}

.study-title__line {
  font-weight: var(--fw-regular);
  color: var(--study-heading);
}

.study-title .dek {
  font-size: var(--fs-body);
  line-height: 1.55;
  letter-spacing: 0.01em;
  color: var(--ink-desc);
  max-width: 65ch;
  margin: 0 0 var(--sp-4);
}

.study-title .dateline {
  font-size: var(--fs-body-sm);
  color: var(--ink-desc);
  margin: 0;
}

.study-title .dateline span {
  color: var(--ink);
  font-weight: var(--fw-medium);
}

/* Intro blocks */
.the-bet {
  max-width: 720px;
  margin: 0 0 var(--study-block-gap);
  padding: 0;
  border: none;
  font-size: 17px;
  line-height: 1.55;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.the-bet::before {
  display: block;
  position: static;
  background: none;
  padding: 0;
  margin-bottom: var(--sp-3);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-medium);
  color: var(--ink-desc);
  letter-spacing: 0.02em;
}

.the-bet strong {
  color: var(--study-heading-soft);
  font-weight: var(--fw-medium);
}

.team-credit {
  max-width: 720px;
  margin: 0 0 var(--sp-7);
  padding: 0;
  border: none;
  font-size: var(--fs-body-sm);
  line-height: 22px;
  color: var(--ink-desc);
}

.team-credit strong {
  color: var(--ink);
  font-weight: var(--fw-medium);
}

.team-credit strong {
  color: var(--ink);
}

/* TOC sits in the right gutter, outside the page rail */
.toc {
  position: fixed;
  top: 50%;
  left: calc(50% + var(--page-max) / 2 + 24px);
  right: auto;
  max-width: calc((100vw - var(--page-max)) / 2 - 40px);
  transform: translateY(-50%);
  z-index: var(--z-sticky);
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms var(--ease);
}

.toc.is-ready {
  opacity: 1;
  pointer-events: auto;
}

.toc ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toc a {
  font-size: 14px;
  color: var(--ink-soft);
  font-weight: var(--fw-regular);
  text-decoration: none;
  display: block;
  min-height: 44px;
  padding: 4px 0;
  line-height: 1.35;
  letter-spacing: 0.01em;
  transition: color 200ms var(--ease);
}

.toc a:hover,
.toc a:focus-visible,
.toc a.is-current {
  color: var(--ink);
  text-decoration: none;
}

.toc a.is-current {
  font-weight: var(--fw-medium);
}

/* Sections */
.section {
  max-width: none;
  margin: 0;
}

.section[data-motion="section"] {
  transition: none;
}

html.motion-enabled .section[data-motion="section"]:not(.is-visible) {
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
}

html.motion-enabled .section[data-motion="section"].is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.section-header {
  margin-bottom: var(--study-block-gap);
  max-width: 768px;
}

.section-tag {
  display: block;
  font-family: var(--sans);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-medium);
  color: var(--ink-soft);
  letter-spacing: var(--track-body);
  margin-bottom: var(--sp-4);
}

.section-tag .num {
  color: var(--study-tag);
  font-weight: var(--fw-medium);
}

.section h2 {
  font-size: clamp(32px, 3vw, 40px);
  font-weight: var(--fw-regular);
  letter-spacing: -0.025em;
  line-height: 1.12;
  color: var(--study-heading);
  max-width: 18ch;
  margin: 0 0 var(--sp-5);
}

.section-lede {
  font-size: var(--fs-body);
  line-height: 1.55;
  letter-spacing: 0.01em;
  color: var(--ink-desc);
  max-width: 52ch;
  margin: 0;
}

/* Prose */
.prose {
  max-width: 65ch;
  margin-bottom: var(--block-gap);
}

.prose p {
  font-size: var(--fs-body-sm);
  line-height: 1.5;
  letter-spacing: 0.01em;
  color: var(--ink);
  margin: 0 0 var(--sp-4);
}

.prose p:last-child {
  margin-bottom: 0;
}

.prose strong {
  color: var(--ink);
  font-weight: var(--fw-medium);
}

.prose strong {
  font-weight: var(--fw-medium);
  color: var(--ink);
}

.prose code {
  font-family: var(--mono);
  font-size: var(--fs-body-sm);
  background: var(--study-stage);
  padding: 2px 6px;
  border-radius: 4px;
  border: none;
}

/* Image stages: grey field like homepage */
.study-media,
.doc-figure,
.pair figure,
.shipped-grid figure {
  margin: 0 0 var(--block-gap);
}

.doc-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--grid-gap);
  margin: var(--block-gap) 0;
}

.doc-figure {
  padding: clamp(24px, 3vw, 40px);
  background: var(--study-stage);
  border: 1px solid var(--study-card-border);
  border-radius: var(--study-radius-lg);
}

.doc-figure img {
  width: 100%;
  height: auto;
  border-radius: 12px;
  background: #FFFFFF;
  image-rendering: auto;
}

.doc-figure--wide img {
  width: 100%;
  height: auto;
}

.doc-figure figcaption {
  margin-top: var(--sp-4);
  font-size: var(--fs-body-sm);
  line-height: 20px;
  color: var(--ink-desc);
}

.doc-figure figcaption strong:first-child {
  display: block;
  color: var(--study-heading-soft);
  font-weight: var(--fw-medium);
  margin-bottom: 4px;
}

.doc-figure figcaption strong {
  color: var(--ink);
  font-weight: var(--fw-medium);
}

.doc-figure--pdf iframe {
  display: block;
  width: 100%;
  height: clamp(480px, 72vh, 920px);
  border: 0;
  border-radius: 12px;
  background: #FFFFFF;
}

.doc-figure__pdf-fallback {
  margin: var(--sp-3) 0 0;
  font-size: var(--fs-body-sm);
  line-height: 1.5;
}

.doc-figure__pdf-fallback a {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

/* Hero metric */
.hero-number {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--sp-6);
  align-items: center;
  margin: var(--block-gap) 0;
  padding: var(--sp-6) 0;
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  background: transparent;
  border-radius: 0;
}

.hero-number .figure {
  font-size: clamp(40px, 5vw, 56px);
  font-weight: var(--fw-light);
  color: var(--ink);
  line-height: 1;
}

.hero-number .figure-label {
  font-size: var(--fs-body-sm);
  line-height: 22px;
  color: var(--ink-desc);
  max-width: 36ch;
}

/* Preview modes: hairline grid */
.preview-modes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: var(--block-gap) 0;
  border: 1px solid var(--hairline);
  border-radius: 16px;
  overflow: hidden;
  background: #FFFFFF;
}

.preview-modes--lead .preview-modes__lead {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(28px, 5vw, 56px);
  align-items: center;
  padding: clamp(32px, 5vw, 56px) clamp(28px, 4vw, 40px);
  background: var(--study-stage);
  border-bottom: 1px solid var(--hairline);
}

.preview-modes__figure {
  font-size: clamp(80px, 14vw, 128px);
  font-weight: var(--fw-light);
  letter-spacing: -0.04em;
  line-height: 0.85;
  color: var(--study-heading);
  font-variant-numeric: tabular-nums;
}

.preview-modes__lede {
  font-size: clamp(18px, 1.6vw, 22px);
  font-weight: var(--fw-regular);
  letter-spacing: -0.02em;
  line-height: 1.4;
  color: var(--study-heading);
  margin: 0;
  max-width: 28ch;
}

.preview-mode {
  padding: var(--sp-5);
  background: #FFFFFF;
  border: none;
  border-right: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  border-radius: 0;
  transition: background 200ms var(--ease);
}

.preview-mode:nth-child(2n) {
  border-right: none;
}

.preview-mode:nth-last-child(-n+2) {
  border-bottom: none;
}

.preview-mode:hover {
  background: var(--study-card);
  transform: none;
}

.preview-mode--used {
  background: var(--study-card-muted);
}

.preview-mode--used:hover {
  background: var(--study-stage);
}

.preview-mode--used::after {
  font-family: var(--mono);
  font-size: var(--fs-body-sm);
  color: var(--ink-desc);
  letter-spacing: 0.06em;
}

.preview-mode .num {
  font-family: var(--mono);
  font-size: var(--fs-body-sm);
  color: var(--ink-desc);
  margin-bottom: var(--sp-3);
}

.preview-mode .name {
  font-size: 16px;
  font-weight: var(--fw-semibold);
  color: var(--study-heading-soft);
  margin-bottom: var(--sp-2);
}

.preview-mode > img {
  width: 48px;
  height: 48px;
  object-fit: contain;
  margin-bottom: var(--sp-3);
}

.preview-mode p {
  font-size: var(--fs-body-sm);
  line-height: 20px;
  color: var(--ink-desc);
}

.preview-mode p strong {
  color: var(--ink);
  font-weight: var(--fw-medium);
}

/* Personas */
.pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--grid-gap);
  margin: var(--block-gap) 0;
}

.pair figure {
  padding: clamp(20px, 2.5vw, 32px);
  background: var(--study-stage);
  border: 1px solid var(--study-card-border);
  border-radius: var(--study-radius-lg);
}

.pair figure:hover {
  border-color: transparent;
}

.pair img {
  width: 100%;
  height: auto;
  aspect-ratio: auto;
  object-fit: contain;
  border: none;
  border-radius: 12px;
  filter: none;
  background: #FFFFFF;
}

.pair figcaption {
  margin-top: var(--sp-4);
  font-size: var(--fs-body-sm);
  line-height: 20px;
  color: var(--ink-desc);
}

.pair figcaption strong {
  color: var(--ink);
  font-weight: var(--fw-medium);
  font-size: var(--fs-body-sm);
}

/* Buckets */
.split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--grid-gap);
  margin: var(--block-gap) 0;
}

.bucket {
  padding: var(--sp-5);
  background: #FFFFFF;
  border: 1px solid var(--hairline);
  border-radius: 16px;
}

.split--open {
  position: relative;
  gap: clamp(56px, 10vw, 120px);
  margin: var(--block-gap) 0;
  padding: clamp(40px, 6vw, 64px) 0;
  border-top: 1px solid var(--hairline);
  border-bottom: none;
}

.split--open::after {
  content: "";
  position: absolute;
  top: clamp(40px, 6vw, 64px);
  bottom: 0;
  left: 50%;
  width: 1px;
  background: var(--hairline);
  transform: translateX(-50%);
  pointer-events: none;
}

.split--open .bucket {
  padding: 0 clamp(20px, 4vw, 40px) 0 0;
  background: none;
  border: none;
  border-radius: 0;
}

.split--open .bucket:last-child {
  padding: 0 0 0 clamp(20px, 4vw, 40px);
}

.split--open .bucket--fixable {
  background: none;
  border: none;
}

.split--open .bucket-tag {
  display: block;
  margin-bottom: var(--sp-5);
  font-size: var(--fs-body-sm);
  letter-spacing: var(--track-body);
  line-height: 1.4;
}

.split--open .bucket .bucket-title {
  display: block;
  font-size: clamp(22px, 2.2vw, 28px);
  font-weight: var(--fw-regular);
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: var(--study-heading);
  margin-bottom: var(--sp-6);
  max-width: 20ch;
}

.split--open .bucket ul {
  font-size: var(--fs-body-sm);
  line-height: 1.65;
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  max-width: 36ch;
}

.split--open .bucket ul li {
  margin: 0;
}

.bucket:hover {
  border-color: var(--hairline);
}

.bucket--fixable {
  background: var(--study-card-muted);
  border-color: var(--study-card-border);
}

.bucket-tag {
  font-family: var(--sans);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-medium);
  color: var(--ink-soft);
  letter-spacing: var(--track-body);
  margin-bottom: var(--sp-3);
}

.bucket-tag::before {
  display: none;
}

.bucket--fixable .bucket-tag {
  color: var(--ink-soft);
}

.bucket .bucket-title {
  font-size: 16px;
  font-weight: var(--fw-medium);
  color: var(--study-heading-soft);
  margin-bottom: var(--sp-3);
}

.bucket ul {
  font-size: var(--fs-body-sm);
  line-height: 20px;
  color: var(--ink-desc);
}

.bucket ul li::before {
  background: var(--ink-desc);
}

.bucket--fixable ul li::before {
  background: var(--ink);
}

/* Strategies */
.strategies {
  margin: var(--block-gap) 0;
  border: none;
  border-radius: 0;
  overflow: visible;
  background: none;
}

.strategy {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: var(--sp-5);
  padding: var(--sp-6) 0;
  border-bottom: 1px solid var(--hairline);
  background: none;
}

.strategy:first-child {
  border-top: 1px solid var(--hairline);
}

.strategy:last-child {
  border-bottom: 1px solid var(--hairline);
}

.strategy:hover {
  background: none;
}

.strategy-method {
  font-family: var(--sans);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-medium);
  color: var(--ink-soft);
  letter-spacing: var(--track-body);
}

.strategy-content h4 {
  font-size: clamp(18px, 1.6vw, 20px);
  font-weight: var(--fw-regular);
  letter-spacing: -0.02em;
  color: var(--study-heading);
  margin: 0 0 6px;
}

.strategy-content p {
  font-size: var(--fs-body);
  line-height: 1.55;
  color: var(--ink-desc);
}

.strategy-content code {
  font-size: var(--fs-body-sm);
  background: var(--study-stage);
  border: none;
  padding: 2px 6px;
  border-radius: 4px;
}

/* Cuts */
.cuts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--grid-gap);
  margin: var(--block-gap) 0;
}

.cut {
  padding: var(--sp-6) var(--sp-8) var(--sp-6) 0;
  background: none;
  border: none;
  border-radius: 0;
  border-bottom: 1px solid var(--hairline);
  opacity: 1;
  position: relative;
  padding-top: var(--sp-6);
}

.cuts--stack {
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--hairline);
}

.cuts--stack .cut:last-child {
  border-bottom: none;
}

.cut::before {
  content: "✕";
  position: absolute;
  top: var(--sp-6);
  right: 0;
  font-size: 14px;
  line-height: 1;
  color: var(--ink-desc);
  opacity: 0.35;
}

.cut::after {
  display: none;
}

.cut .cut-idea {
  font-size: clamp(18px, 1.6vw, 20px);
  font-weight: var(--fw-regular);
  letter-spacing: -0.02em;
  color: var(--study-heading);
  max-width: 40ch;
}

.cut .cut-reason {
  font-size: var(--fs-body);
  line-height: 1.55;
  color: var(--ink-desc);
  max-width: 56ch;
}

.cut .cut-reason strong {
  color: var(--ink);
  font-weight: var(--fw-medium);
}

.cut--visual .cut__figure {
  margin: var(--sp-5) 0 var(--sp-6);
  width: calc(100% + 64px);
  margin-inline: -32px;
}

.cut--visual .cut-reason {
  margin-top: 0;
}

@media (max-width: 639px) {
  .cut--visual .cut__figure {
    width: 100%;
    margin-inline: 0;
  }
}

.doc-figure.is-dark {
  background: #111111;
}

.doc-figure.is-dark img {
  border-radius: 8px;
  background: transparent;
}

/* Happy paths */
.paths {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--grid-gap);
  margin: var(--block-gap) 0;
}

.path {
  padding: var(--sp-5);
  background: #FFFFFF;
  border: 1px solid var(--hairline);
  border-radius: 16px;
}

.paths--flow {
  gap: clamp(40px, 6vw, 72px);
  align-items: start;
}

.paths--flow .path {
  padding: var(--sp-6) 0 0;
  background: none;
  border: none;
  border-radius: 0;
  border-top: 1px solid var(--hairline);
}

.paths--flow .path h3 {
  font-size: clamp(22px, 2vw, 28px);
  font-weight: var(--fw-regular);
  letter-spacing: -0.02em;
  color: var(--study-heading);
  margin: 0 0 var(--sp-2);
}

.paths--flow .path-method {
  margin-bottom: var(--sp-5);
}

.paths--flow .path ol {
  font-size: var(--fs-body);
  line-height: 1.6;
}

.path h3 {
  font-size: 16px;
  font-weight: var(--fw-semibold);
  color: var(--study-heading-soft);
  margin: 0 0 var(--sp-2);
}

.path-method {
  display: inline-block;
  font-family: var(--sans);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-medium);
  letter-spacing: var(--track-body);
  color: var(--ink-soft);
  margin-bottom: var(--sp-4);
}

.path ol {
  margin: 0;
  padding-left: 1.15rem;
  font-size: var(--fs-body-sm);
  line-height: 1.65;
  color: var(--ink-desc);
}

.path li {
  margin-bottom: 6px;
}

.path li strong {
  color: var(--ink);
  font-weight: var(--fw-medium);
}

.paths--visual .path {
  display: flex;
  flex-direction: column;
  padding: clamp(20px, 2.5vw, 28px);
  background: var(--study-card);
  border: 1px solid var(--study-card-border);
  border-radius: var(--study-radius-lg);
}

.paths--visual .path ol {
  flex: 1;
  counter-reset: path-step;
  list-style: none;
  padding: 0;
}

.paths--visual .path li {
  position: relative;
  padding-left: 2rem;
  margin-bottom: 8px;
}

.paths--visual .path li::before {
  counter-increment: path-step;
  content: counter(path-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: var(--fw-medium);
  color: var(--ink-desc);
  letter-spacing: 0.04em;
}

.path__shot {
  margin: var(--sp-5) 0 0;
  padding: var(--sp-4);
  background: #FFFFFF;
  border-radius: 16px;
  line-height: 0;
}

.path__shot img {
  width: 100%;
  height: auto;
  border-radius: 12px;
  cursor: zoom-in;
}

/* Shipped UI walkthrough */
.study-screens {
  display: flex;
  flex-direction: column;
  gap: var(--block-gap);
  margin: var(--section-pt) 0 0;
  padding-top: 0;
  border-top: none;
  --study-screen-max-h: min(68vh, 720px);
  --study-screen-pad: clamp(28px, 4.5vw, 56px);
  --study-screen-inner-pad: clamp(24px, 3.5vw, 44px);
}

.study-screens__lede {
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.55;
  color: var(--ink-desc);
}

.study-screens__bridge {
  margin: 0;
}

.study-screens__shot {
  margin: 0;
}

.study-screens__shot.doc-figure {
  padding: var(--study-screen-pad);
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
  background: var(--study-stage);
}

.study-screens__canvas {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: min(52vh, 620px);
  max-height: var(--study-screen-max-h);
  padding: var(--study-screen-inner-pad);
  background: #FFFFFF;
  border-radius: 12px;
  overflow: hidden;
}

.study-screens__canvas--wide {
  min-height: min(46vh, 540px);
}

.study-screens__canvas img,
.study-screens__panel {
  display: block;
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: calc(var(--study-screen-max-h) - (var(--study-screen-inner-pad) * 2));
  object-fit: contain;
  object-position: center center;
  cursor: zoom-in;
}

.study-screens__pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 2.5vw, 28px);
  width: 100%;
}

.study-screens__pair .study-screens__canvas {
  min-height: min(56vh, 660px);
}

.study-screens__bridge.prose {
  max-width: none;
  margin: 0;
  padding: 0;
  background: transparent;
  border: none;
  border-radius: 0;
}

/* Shipped grid */
.shipped-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--grid-gap);
  margin: var(--block-gap) 0;
}

.shipped-grid figure {
  padding: clamp(20px, 2.5vw, 32px);
  background: var(--study-stage);
  border: 1px solid var(--study-card-border);
  border-radius: 24px;
  transition: none;
}

.shipped-grid figure:hover {
  transform: none;
  border-color: transparent;
}

.shipped-grid img {
  width: 100%;
  height: auto;
  border-radius: 12px;
  background: #FFFFFF;
}

.shipped-grid figcaption {
  margin-top: var(--sp-4);
  font-size: var(--fs-body-sm);
  line-height: 20px;
  color: var(--ink-desc);
}

.shipped-grid figcaption strong {
  color: var(--ink);
  font-weight: var(--fw-medium);
}

/* Principles */
.principles {
  margin: var(--block-gap) 0;
  border-top: 1px solid var(--hairline);
}

.principles--cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sp-4);
  border-top: none;
}

.principles--cards .principle {
  padding: var(--sp-5);
  background: var(--study-card);
  border: 1px solid var(--study-card-border);
  border-radius: var(--study-radius-md);
  grid-template-columns: 28px 1fr;
  align-items: start;
}

.principles--cards .principle .num {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  background: #FFFFFF;
  border-radius: 50%;
  font-size: 11px;
}

.principles--stack {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--hairline);
}

.principles--stack .principle {
  grid-template-columns: 48px 1fr;
  gap: clamp(20px, 3vw, 32px);
  padding: var(--sp-6) 0;
  align-items: start;
}

.principles--stack .principle .num {
  padding-top: 4px;
  font-size: 12px;
  letter-spacing: 0.06em;
}

.principles--stack .principle p {
  font-size: var(--fs-body);
  line-height: 1.6;
  max-width: 58ch;
}

.principles--stack .principle strong {
  display: inline;
  font-weight: var(--fw-medium);
}

.principles--compact .principle {
  padding: var(--sp-5) 0;
}

.principles--compact .principle p {
  font-size: var(--fs-body-sm);
  line-height: 1.55;
}

.principle {
  padding: var(--sp-5) 0;
  border-bottom: 1px solid var(--hairline);
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: var(--sp-4);
}

.principle .num {
  font-family: var(--mono);
  font-size: var(--fs-body-sm);
  color: var(--ink-desc);
}

.principle p {
  font-size: var(--fs-body-sm);
  line-height: 22px;
  color: var(--ink);
}

.principle strong {
  color: var(--ink);
  font-weight: var(--fw-medium);
}

.principle code {
  background: var(--study-stage);
  border: none;
}

/* Receipts: stats row like homepage */
.receipts {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--sp-6);
  margin: var(--block-gap) 0;
  padding: var(--sp-6) 0;
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.receipts--impact {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(24px, 4vw, 48px);
  padding: var(--sp-8) 0;
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.receipts--impact .receipt {
  padding: 0 0 0 clamp(20px, 3vw, 32px);
  background: none;
  border: none;
  border-radius: 0;
  border-left: 1px solid var(--hairline);
}

.receipts--impact .receipt:first-child {
  padding-left: 0;
  border-left: none;
}

.receipts--impact .receipt .figure {
  font-size: clamp(40px, 5vw, 64px);
  margin-bottom: var(--sp-4);
}

.receipts--impact.receipts--quad {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.lens-2026__outro {
  max-width: 56ch;
  margin: var(--block-gap) 0 0;
}

.lens-2026__outro p {
  font-size: var(--fs-body);
  line-height: 1.6;
  color: var(--ink-desc);
}

.receipt .figure {
  display: block;
  font-size: clamp(28px, 3vw, 40px);
  font-weight: var(--fw-light);
  color: var(--study-heading);
  line-height: 1;
  margin-bottom: var(--sp-2);
}

.receipt .label {
  font-size: var(--fs-body-sm);
  line-height: 20px;
  color: var(--ink-desc);
}

.receipt .label strong {
  display: block;
  color: var(--ink);
  font-weight: var(--fw-medium);
  margin-bottom: 2px;
}

/* 2026 lens */
.lens-2026 {
  max-width: none;
}

.lens-2026__intro {
  max-width: 768px;
  margin-bottom: var(--block-gap);
}

.lens-2026 h2 {
  font-size: clamp(32px, 3vw, 40px);
  font-weight: var(--fw-regular);
  letter-spacing: -0.025em;
  color: var(--study-heading);
  margin: var(--sp-4) 0 0;
  max-width: 20ch;
}

.lens-2026__lede {
  font-size: var(--fs-body);
  line-height: 1.6;
  color: var(--ink-desc);
  margin: var(--sp-5) 0 0;
  max-width: 52ch;
}

.lens-shifts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sp-4);
  margin: var(--block-gap) 0 0;
}

.lens-shifts--cards {
  gap: clamp(16px, 2vw, 24px);
}

.lens-shifts--cards .lens-shift {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  padding: clamp(24px, 3vw, 32px);
  background: var(--study-card);
  border: 1px solid var(--study-card-border);
  border-radius: var(--study-radius-md);
}

.lens-shifts--cards .from-to {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.lens-shifts--cards .from-to .from {
  font-family: var(--sans);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-medium);
  letter-spacing: var(--track-body);
  color: var(--ink-soft);
}

.lens-shifts--cards .from-to .to {
  font-size: clamp(20px, 2vw, 26px);
  font-weight: var(--fw-light);
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--study-heading);
}

.lens-shifts--cards .from-to .to::before {
  content: "→ ";
  color: var(--ink-desc);
  font-weight: var(--fw-light);
}

.lens-shifts--cards .lens-shift p {
  font-size: var(--fs-body-sm);
  line-height: 1.55;
  color: var(--ink-desc);
  margin: 0;
}

.lens-shifts--stack {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: var(--block-gap) 0;
  border-top: 1px solid var(--hairline);
}

.lens-shift {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-3);
  padding: var(--sp-5);
  background: var(--study-card);
  border: 1px solid var(--study-card-border);
  border-radius: var(--study-radius-md);
}

.lens-shifts--stack .lens-shift {
  grid-template-columns: minmax(0, 0.38fr) minmax(0, 1fr);
  gap: clamp(20px, 4vw, 48px);
  align-items: start;
  padding: var(--sp-6) 0;
  background: none;
  border: none;
  border-radius: 0;
  border-bottom: 1px solid var(--hairline);
}

.lens-shifts--stack .lens-shift:last-child {
  border-bottom: none;
}

.lens-shift .from-to {
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-medium);
  color: var(--study-heading-soft);
}

.lens-shifts--stack .from-to {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: clamp(22px, 2.2vw, 30px);
  font-weight: var(--fw-light);
  letter-spacing: -0.025em;
  line-height: 1.15;
  color: var(--study-heading);
}

.lens-shift .from-to .from {
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-regular);
  color: var(--ink-desc);
}

.lens-shifts--stack .from-to .from {
  font-family: var(--sans);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-medium);
  letter-spacing: var(--track-body);
  color: var(--ink-soft);
  display: block;
  margin-bottom: 8px;
}

.lens-shifts--stack .from-to .to {
  display: block;
  color: var(--study-heading);
}

.lens-shifts--stack .from-to .to::before {
  content: "→ ";
  color: var(--ink-desc);
  font-weight: var(--fw-light);
}

.lens-shift p {
  font-size: var(--fs-body-sm);
  line-height: 20px;
  color: var(--ink-desc);
}

.lens-shifts--stack .lens-shift p {
  font-size: var(--fs-body);
  line-height: 1.55;
  max-width: 48ch;
  margin: 0;
}

.lens-shift strong {
  color: var(--ink);
  font-weight: var(--fw-medium);
}

/* Research insights: open two-column, no boxes */
.study-insights {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(32px, 5vw, 64px);
  margin: var(--block-gap) 0 0;
  padding-top: var(--sp-6);
  border-top: 1px solid var(--hairline);
}

.study-insight p {
  font-size: var(--fs-body);
  line-height: 1.6;
  color: var(--ink);
  margin: 0;
}

.study-insight strong {
  color: var(--ink);
  font-weight: var(--fw-medium);
}

/* Closing */
.closing-note {
  font-size: clamp(22px, 2vw, 28px);
  font-weight: var(--fw-regular);
  letter-spacing: -0.02em;
  line-height: 1.35;
  color: var(--study-heading);
  max-width: 56ch;
  margin: var(--study-section-gap) 0 var(--study-block-gap);
}

.closing-note strong {
  font-weight: var(--fw-medium);
}

.editorial-note {
  font-size: var(--fs-body-sm);
  line-height: 20px;
  color: var(--ink-desc);
  padding: var(--sp-4) 0;
  border-top: 1px solid var(--hairline);
  background: none;
  border-radius: 0;
  margin: var(--block-gap) 0;
}

.editorial-note::before {
  color: var(--ink-soft);
}

.editorial-note code {
  background: var(--study-stage);
  border: none;
}

/* Next study */
.nextstudy {
  margin: var(--section-pt) 0 0;
  padding-block: var(--sp-6);
  border-top: 1px solid var(--hairline);
}

.nextstudy-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
  padding: clamp(28px, 4vw, 40px) clamp(28px, 4vw, 48px);
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: 20px;
  transition: border-color 300ms cubic-bezier(0.22, 1, 0.36, 1);
}

.nextstudy-card:hover {
  border-color: color-mix(in srgb, var(--ink) 14%, var(--hairline));
}

.nextstudy-card__main {
  min-width: 0;
}

.nextstudy-card__brand {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--sp-3);
  margin: 0 0 var(--sp-4);
}

.nextstudy-card__label {
  font-family: var(--sans);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-medium);
  letter-spacing: var(--track-body);
  color: var(--ink-soft);
}

.nextstudy-card__sep {
  color: var(--ink-desc);
  font-size: var(--fs-body-sm);
}

.nextstudy-card__meta {
  font-size: var(--fs-body-sm);
  color: var(--ink-desc);
}

.nextstudy-card__title {
  font-family: var(--sans);
  font-size: clamp(24px, 2.2vw, 32px);
  font-weight: var(--fw-regular);
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--heading-color);
  margin: 0;
  max-width: 28ch;
  text-wrap: balance;
}

.nextstudy-card__dek {
  font-family: var(--sans);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-regular);
  line-height: 1.55;
  letter-spacing: var(--track-body);
  color: var(--ink-desc);
  margin: var(--sp-3) 0 0;
  max-width: 48ch;
}

.nextstudy-card__action {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

/* Footer */
body.study--diagnostics .sitefooter:not(.sitefooter--closing),
body.study--studio .sitefooter:not(.sitefooter--closing),
body.study--sellerapp .sitefooter:not(.sitefooter--closing) {
  margin-top: var(--sp-7);
  padding-block: var(--sp-6) var(--sp-7);
  border-top: 1px solid var(--hairline);
  font-size: var(--fs-body-sm);
  color: var(--ink-desc);
}

/* Responsive */
@media (max-width: 1023px) {
  .toc {
    display: none;
  }
}

@media (max-width: 900px) {
  .study-showcase__inner {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 28px 28px 0;
  }

  .study-showcase__shot {
    height: calc(var(--showcase-stage-height) - 28px);
  }
}

@media (max-width: 720px) {
  .study-shell {
    padding-inline: 24px;
    --study-bleed: 24px;
  }

  .nextstudy-card {
    grid-template-columns: 1fr;
    gap: var(--sp-6);
    align-items: start;
    padding: var(--sp-6);
  }

  .nextstudy-card__action {
    justify-content: flex-start;
  }

  .nextstudy-card__title,
  .nextstudy-card__dek {
    max-width: none;
  }

  .paths,
  .doc-grid,
  .pair,
  .split,
  .cuts,
  .shipped-grid,
  .preview-modes,
  .study-product__grid,
  .visual-band,
  .visual-band--reverse,
  .principles--cards,
  .lens-shifts,
  .study-insights,
  .lens-shifts--stack .lens-shift {
    grid-template-columns: 1fr;
  }

  .preview-modes--lead .preview-modes__lead {
    grid-template-columns: 1fr;
    gap: var(--sp-5);
    padding: var(--sp-6) var(--sp-5);
  }

  .preview-modes__figure {
    font-size: clamp(64px, 18vw, 96px);
  }

  .receipts--impact.receipts--quad {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .receipts--impact .receipt {
    padding-left: 0;
    border-left: none;
    padding-top: var(--sp-5);
    border-top: 1px solid var(--hairline);
  }

  .receipts--impact .receipt:first-child {
    padding-top: 0;
    border-top: none;
  }

  .split--open {
    gap: var(--sp-8);
    padding: var(--sp-7) 0;
  }

  .split--open::after {
    display: none;
  }

  .split--open .bucket,
  .split--open .bucket:last-child {
    padding: 0;
  }

  .split--open .bucket .bucket-title {
    max-width: none;
  }

  .split--open .bucket ul {
    max-width: none;
  }

  .visual-band--reverse .visual-band__text {
    order: 2;
  }

  .visual-band--reverse .visual-band__media {
    order: 1;
  }

  .study-screens__pair {
    grid-template-columns: 1fr;
  }

  .study-screens__canvas,
  .study-screens__pair .study-screens__canvas {
    min-height: min(44vh, 520px);
    --study-screen-inner-pad: clamp(20px, 4vw, 32px);
  }

  .study-screens {
    --study-screen-max-h: min(52vh, 580px);
    --study-screen-pad: clamp(20px, 4vw, 32px);
  }

  .preview-mode {
    border-right: none;
  }

  .preview-mode:nth-last-child(-n+2) {
    border-bottom: 1px solid var(--hairline);
  }

  .preview-mode:last-child {
    border-bottom: none;
  }

  .receipts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .lens-shift {
    grid-template-columns: 1fr;
  }

  .strategy {
    grid-template-columns: 1fr;
  }
}

  @media (max-width: 639px) {
  .page-rails.study-rails .section + .section,
  .page-rails.study-rails .study-article {
    margin-top: 96px;
    padding-top: 96px;
  }

  .receipts {
    grid-template-columns: 1fr;
    gap: var(--sp-5);
  }
}

@media (prefers-reduced-motion: reduce) {
  .toc {
    opacity: 1;
    pointer-events: auto;
  }

  .section[data-motion="section"],
  html.motion-enabled .section[data-motion="section"]:not(.is-visible) {
    opacity: 1;
    transform: none;
    pointer-events: auto;
  }
}

/* Testimonial */
.study-testimonial {
  margin: var(--sp-7) 0 0;
  padding-top: var(--sp-6);
  border-top: 1px solid var(--hairline);
}

.study-testimonial--visual {
  display: grid;
  gap: var(--sp-5);
  margin-top: var(--block-gap);
  padding-top: 0;
  border-top: none;
}

.study-testimonial--visual .doc-figure {
  margin: 0;
}

.study-testimonial__lede {
  margin: 0;
  max-width: 52ch;
  font-size: 18px;
  line-height: 1.55;
  color: var(--ink-soft);
}

.study-testimonial .doc-figure img {
  cursor: zoom-in;
}

/* Image lightbox */
.study-zoomable {
  cursor: zoom-in;
  pointer-events: auto;
  position: relative;
  z-index: 1;
}

.study-lightbox {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-sticky) + 20);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-4);
  touch-action: none;
}

.study-lightbox[hidden] {
  display: none;
}

.study-lightbox__backdrop {
  position: absolute;
  inset: 0;
  border: 0;
  margin: 0;
  padding: 0;
  background: rgba(0, 0, 0, 0.94);
  cursor: zoom-out;
  opacity: 0;
  transition: opacity 240ms var(--ease);
}

.study-lightbox.is-open .study-lightbox__backdrop {
  opacity: 1;
}

.study-lightbox__frame {
  position: relative;
  z-index: 1;
  width: min(96vw, 1500px);
  height: min(90vh, 980px);
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  pointer-events: none;
}

.study-lightbox__viewport {
  position: relative;
  flex: 1 1 auto;
  overflow: hidden;
  width: 100%;
  border-radius: 12px;
  background: transparent;
  touch-action: none;
  pointer-events: auto;
}

.study-lightbox__stage {
  position: absolute;
  top: 0;
  left: 0;
  transform-origin: 0 0;
  will-change: transform;
  backface-visibility: hidden;
  pointer-events: none;
}

.study-lightbox__stage.is-smooth {
  transition: transform 280ms cubic-bezier(0.22, 1, 0.36, 1);
}

.study-lightbox__stage.is-dragging {
  transition: none;
  cursor: grabbing;
}

.study-lightbox__img {
  display: block;
  width: auto;
  height: auto;
  max-width: none;
  max-height: none;
  border-radius: 8px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  pointer-events: none;
  user-select: none;
  -webkit-user-drag: none;
  image-rendering: auto;
}

.study-lightbox__loader {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.25);
  border-top-color: #FFFFFF;
  animation: study-lightbox-spin 700ms linear infinite;
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms var(--ease);
}

.study-lightbox__viewport.is-loading .study-lightbox__loader {
  opacity: 1;
}

.study-lightbox__viewport.is-zoomed {
  cursor: grab;
}

.study-lightbox__viewport:not(.is-zoomed) {
  cursor: zoom-out;
}

.study-lightbox__viewport.is-zoomed.is-dragging,
.study-lightbox__stage.is-dragging {
  cursor: grabbing;
}

.study-lightbox__hint {
  margin: 0;
  text-align: center;
  font-size: var(--fs-body-sm);
  line-height: 1.45;
  color: rgba(255, 255, 255, 0.78);
  pointer-events: none;
  opacity: 0;
  transition: opacity 280ms var(--ease);
}

.study-lightbox.is-open .study-lightbox__hint {
  opacity: 1;
}

body.study-lightbox-open {
  overflow: hidden;
}

body.study-lightbox-open .study-showcase,
body.study-lightbox-open .study-article,
body.study-lightbox-open .study-title,
body.study-lightbox-open .the-bet,
body.study-lightbox-open .team-credit,
body.study-lightbox-open .toc {
  visibility: hidden;
}

@keyframes study-lightbox-spin {
  to { transform: rotate(360deg); }
}

@media (prefers-reduced-motion: reduce) {
  .study-lightbox__backdrop,
  .study-lightbox__viewport,
  .study-lightbox__hint,
  .study-lightbox__stage.is-smooth {
    transition: none;
  }

  .study-lightbox__loader {
    animation: none;
    border-top-color: rgba(255, 255, 255, 0.8);
  }
}

/* SellerApp — dark image fields for annotated mockups (white callout copy in source art) */
body.study--sellerapp .study-screens__canvas {
  background: #111111;
}

body.study--sellerapp .study-screens__canvas img,
body.study--sellerapp .study-screens__canvas .study-screens__panel,
body.study--sellerapp .study-screens__shot.doc-figure > .study-screens__panel {
  background: #111111;
}

body.study--sellerapp .doc-figure img,
body.study--sellerapp .study-product__card img {
  background: #111111;
}

body.study--sellerapp .doc-grid .doc-figure img {
  background: #ffffff;
}

/* NDA study lock — Studio redesign */
.study-lock-boundary {
  position: relative;
}

.study-lock-gate {
  position: relative;
  z-index: 4;
  margin-top: clamp(24px, 4vw, 40px);
}

.study-lock-gate__panel {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(12px, 1.8vw, 16px);
  max-width: min(100%, 520px);
  margin-inline: auto;
  padding: clamp(32px, 5vw, 44px) clamp(24px, 4vw, 32px) clamp(36px, 5vw, 48px);
  text-align: center;
  border: 1px solid var(--hairline);
  border-radius: 20px;
  background: var(--surface-stage);
  box-shadow: 0 16px 40px rgba(12, 10, 9, 0.06);
}

.study-lock-gate__icon {
  display: grid;
  place-items: center;
  width: 68px;
  height: 68px;
  border-radius: 50%;
  border: 1px solid var(--hairline);
  background: var(--paper);
  color: var(--accent-deep);
}

.study-lock-gate__eyebrow {
  margin: 2px 0 0;
  font-family: var(--sans);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-medium);
  letter-spacing: normal;
  text-transform: none;
  color: var(--accent);
}

.study-lock-gate__title {
  margin: 0;
  font-family: var(--sans);
  font-size: clamp(22px, 2.4vw, 28px);
  font-weight: var(--fw-medium);
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--heading-color);
}

.study-lock-gate__lede {
  margin: 0;
  max-width: 38ch;
  font-size: var(--fs-body);
  line-height: 1.55;
  color: var(--ink-desc);
}

.study-lock-gate__btn {
  margin-top: 8px;
  min-width: min(100%, 280px);
  justify-content: center;
}

.study-lock-gate__btn .case-card__cta-text {
  justify-content: center;
  gap: 10px;
}

.study-lock-gate__btn-icon {
  opacity: 1 !important;
  width: 16px !important;
  margin-left: 0 !important;
  overflow: visible !important;
}

body.study--locked .study-protected-content {
  position: relative;
  max-height: clamp(120px, 18vw, 200px);
  overflow: hidden;
  pointer-events: none;
  user-select: none;
  filter: blur(5px);
  opacity: 0.42;
  mask-image: linear-gradient(to bottom, #000 0%, #000 35%, transparent 100%);
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, #000 35%, transparent 100%);
}

body.study--locked .study-lock-boundary .study-lock-gate {
  margin-top: 0;
}

body.study--unlocked .study-lock-gate {
  display: none;
}

body.study--locked .toc a[href="#inquiry"],
body.study--locked .toc a[href="#concepts"],
body.study--locked .toc a[href="#cuts"],
body.study--locked .toc a[href="#design"],
body.study--locked .toc a[href="#paths"],
body.study--locked .toc a[href="#challenges"],
body.study--locked .toc a[href="#receipts"],
body.study--locked .toc a[href="#lens"] {
  opacity: 0.38;
  pointer-events: none;
}

/* Unlock modal */
.study-unlock-modal {
  position: fixed;
  inset: 0;
  z-index: 21000;
  display: grid;
  place-items: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity 280ms cubic-bezier(0.22, 1, 0.36, 1),
    visibility 280ms cubic-bezier(0.22, 1, 0.36, 1);
}

.study-unlock-modal.is-open {
  opacity: 1;
  visibility: visible;
}

.study-unlock-modal__backdrop {
  position: absolute;
  inset: 0;
  border: none;
  background: rgba(253, 252, 252, 0.82);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  cursor: pointer;
}

.study-unlock-modal__panel {
  position: relative;
  z-index: 1;
  width: min(100%, 420px);
  padding: clamp(32px, 5vw, 40px) clamp(24px, 4vw, 36px) clamp(28px, 4vw, 36px);
  border: 1px solid var(--hairline);
  border-radius: 20px;
  background: var(--paper);
  box-shadow: 0 24px 64px rgba(12, 10, 9, 0.08);
  text-align: center;
  transform: translateY(8px) scale(0.98);
  transition: transform 280ms cubic-bezier(0.22, 1, 0.36, 1);
}

.study-unlock-modal.is-open .study-unlock-modal__panel {
  transform: translateY(0) scale(1);
}

.study-unlock-modal__icon {
  display: grid;
  place-items: center;
  width: 72px;
  height: 72px;
  margin: 0 auto 20px;
  border-radius: 50%;
  border: 1px solid var(--hairline);
  background:
    radial-gradient(120% 120% at 20% 0%, rgba(255, 255, 255, 0.9) 0%, transparent 55%),
    linear-gradient(165deg, var(--surface-contrast) 0%, var(--surface-stage) 100%);
  color: var(--accent-deep);
}

.study-unlock-modal__title {
  margin: 0 0 10px;
  font-family: var(--sans);
  font-size: clamp(24px, 2.6vw, 30px);
  font-weight: var(--fw-medium);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--heading-color);
}

.study-unlock-modal__lede {
  margin: 0 auto 28px;
  max-width: 30ch;
  font-size: var(--fs-body-sm);
  line-height: 1.55;
  color: var(--ink-desc);
}

.study-unlock-modal__form {
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

.study-unlock-modal__pin {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin: 0 auto;
  width: min(100%, 280px);
}

.study-unlock-modal__digit {
  width: 100%;
  aspect-ratio: 1;
  padding: 0;
  border: 1px solid var(--hairline);
  border-radius: 14px;
  background: var(--surface-card);
  font-family: var(--sans);
  font-size: clamp(24px, 4vw, 28px);
  font-weight: var(--fw-medium);
  line-height: 1;
  text-align: center;
  color: var(--ink);
  caret-color: var(--accent-deep);
  transition:
    border-color 200ms ease,
    box-shadow 200ms ease,
    background-color 200ms ease;
}

.study-unlock-modal__digit:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(12, 10, 9, 0.06);
  background: var(--paper);
}

.study-unlock-modal__digit.is-error {
  border-color: #c44;
  box-shadow: 0 0 0 3px rgba(204, 68, 68, 0.12);
}

.study-unlock-modal__error {
  margin: 14px 0 0;
  font-size: var(--fs-body-sm);
  color: #a33;
}

.study-unlock-modal__submit {
  width: 100%;
  justify-content: center;
  margin-top: 24px;
  min-height: 52px;
}

.study-unlock-modal__submit .case-card__cta-text {
  justify-content: center;
  gap: 10px;
}

.study-unlock-modal__submit-icon {
  opacity: 1 !important;
  width: 16px !important;
  margin-left: 0 !important;
  overflow: visible !important;
}

.study-unlock-modal__cancel {
  align-self: center;
  margin-top: 16px;
  padding: 8px 12px;
  border: none;
  border-radius: 999px;
  background: transparent;
  font-family: var(--sans);
  font-size: var(--fs-body-sm);
  color: var(--ink-desc);
  cursor: pointer;
  transition: color 200ms ease;
}

.study-unlock-modal__cancel:hover,
.study-unlock-modal__cancel:focus-visible {
  color: var(--ink);
  outline: none;
}

body.study-unlock-modal-open {
  overflow: hidden;
}

@media (prefers-reduced-motion: reduce) {
  .study-unlock-modal,
  .study-unlock-modal__panel {
    transition: none;
  }
}