:root {
  --story-max: 1120px;
  --story-wide: 1280px;
  --story-progress: 1;
  --measure-progress: 1;
}

.about-page {
  min-height: 100vh;
  background:
    linear-gradient(rgba(248, 247, 243, 0.5), rgba(248, 247, 243, 0.5)),
    url("assets/images/background-image.avif") center / cover fixed;
}

.about-page .site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(16px);
}

.about-story {
  width: 100%;
  margin: 0;
  padding: 22px 0 80px;
}

.about-back-row {
  width: min(calc(100% - 48px), var(--story-wide));
  margin: 0 auto;
}

.about-story .back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 36px;
  padding: 0 16px 0 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.9);
  color: var(--text);
  text-decoration: none;
  backdrop-filter: blur(12px);
  box-shadow: 0 8px 22px rgba(20, 37, 29, 0.16);
  transition: transform 0.15s ease, background-color 0.15s ease, box-shadow 0.15s ease;
}

.about-story .back-link:hover,
.about-story .back-link:focus-visible {
  background: #fff;
  transform: translateY(-1px);
  box-shadow: 0 12px 28px rgba(20, 37, 29, 0.2);
}

.story-kicker {
  display: inline-flex;
  width: fit-content;
  color: var(--primary);
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.story-card,
.story-section,
.scroll-story,
.data-status-card {
  width: min(100%, var(--story-max));
  margin: 0 auto 56px;
}

.tool-intro-panel {
  position: relative;
  display: grid;
  grid-template-columns: minmax(28px, 1fr) minmax(380px, 520px) minmax(340px, 560px) minmax(28px, 1fr);
  gap: clamp(34px, 6vw, 86px);
  align-items: start;
  width: 100%;
  margin: 0 0 26px;
  padding: 60px 0;
}

.tool-intro-statement {
  grid-column: 2;
}

.tool-intro-copy {
  grid-column: 3;
  display: grid;
  gap: 24px;
  max-width: 590px;
  padding-top: clamp(16px, 2vw, 32px);
}

.tool-intro-statement h1 {
  max-width: 620px;
  margin: 8px 0 0;
  color: var(--primary);
  font-size: clamp(3.15rem, 6vw, 5.75rem);
  line-height: 0.98;
  letter-spacing: -0.055em;
}

.tool-intro-copy p {
  margin: 0;
  color: var(--text);
  font-size: 1.03rem;
  line-height: 1.72;
}

.definition-term {
  position: relative;
  display: inline-flex;
  color: var(--primary);
  font-weight: 750;
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 4px;
  cursor: help;
}

.definition-term::after {
  content: attr(data-tooltip);
  position: absolute;
  left: 50%;
  bottom: calc(100% + 12px);
  z-index: 20;
  width: max-content;
  max-width: min(360px, calc(100vw - 48px));
  padding: 14px 16px;
  border: 1px solid rgba(47, 93, 70, 0.28);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.96);
  color: var(--text);
  font-size: 0.82rem;
  font-weight: 600;
  line-height: 1.45;
  text-decoration: none;
  box-shadow: 0 18px 48px rgba(20, 37, 29, 0.18);
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 8px);
  transition: opacity 0.16s ease, transform 0.16s ease;
}

.definition-term:hover::after,
.definition-term:focus-visible::after {
  opacity: 1;
  transform: translate(-50%, 0);
}

.tool-phase-circles {
  display: flex;
  justify-content: center;
  gap: clamp(14px, 2vw, 22px);
}

.tool-phase-circle {
  display: flex;
  flex: 0 0 130px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 130px;
  height: 130px;
  border-radius: 50%;
  background: var(--primary-dark);
  color: #fff;
  text-align: center;
  box-shadow: 0 18px 42px rgba(20, 37, 29, 0.18);
}

.tool-phase-circle strong {
  font-size: 0.92rem;
  font-weight: 850;
  line-height: 1.1;
}

.tool-phase-circle span {
  max-width: 88px;
  margin-top: 7px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.78rem;
  font-weight: 400;
  line-height: 1.22;
}

.purpose-panel {
  position: relative;
  display: grid;
  grid-template-columns: minmax(28px, 1fr) minmax(380px, 520px) minmax(340px, 520px) minmax(28px, 1fr);
  gap: clamp(34px, 6vw, 86px);
  align-items: start;
  width: 100%;
  max-width: none;
  margin: 0 0 42px;
  padding: clamp(46px, 6vw, 84px) 0 clamp(52px, 7vw, 86px);
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.purpose-statement {
  grid-column: 2;
}

@media (min-width: 981px) {
  .purpose-panel {
    grid-template-rows: auto auto;
    column-gap: clamp(34px, 6vw, 86px);
    row-gap: 24px;
    align-content: center;
  }

  .purpose-statement {
    grid-row: 1 / span 2;
    align-self: center;
  }

  .purpose-panel > p {
    padding-top: 0;
  }
}

.purpose-panel > p {
  grid-column: 3;
  max-width: 560px;
  padding-top: clamp(16px, 2vw, 32px);
}

.purpose-statement h2,
.story-heading h2,
.story-sticky h2,
.threshold-demo-copy h3 {
  margin: 8px 0 0;
  color: var(--text);
  font-size: clamp(1.9rem, 4vw, 3.8rem);
  line-height: 1.03;
  letter-spacing: -0.035em;
}

.purpose-statement h2 {
  max-width: 580px;
  color: var(--primary);
}

.purpose-panel p,
.story-heading p,
.story-sticky p {
  margin: 0;
  color: var(--text);
  font-size: 1.03rem;
  line-height: 1.72;
}

.scroll-story {
  --story-progress: 1;
  display: grid;
  grid-template-columns: minmax(260px, 0.82fr) minmax(0, 1.18fr);
  gap: clamp(34px, 6vw, 86px);
  min-height: 210vh;
  padding: 32px 0 64px;
}

.story-sticky {
  position: sticky;
  top: 118px;
  align-self: start;
  display: grid;
  gap: 0;
  min-height: 360px;
  padding-top: 16px;
}

.story-sticky p {
  margin-top: 12px;
}

.workflow-timeline {
  position: relative;
  display: grid;
  gap: 44px;
  padding: 24vh 0 24vh 46px;
}

.timeline-rail {
  position: absolute;
  top: 24vh;
  bottom: 24vh;
  left: 14px;
  width: 2px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(199, 188, 173, 0.78);
}

.timeline-rail span {
  display: block;
  width: 100%;
  height: calc(var(--story-progress) * 100%);
  border-radius: inherit;
  background: linear-gradient(var(--primary), #88a985);
}

.workflow-step-card {
  position: relative;
  display: grid;
  grid-template-columns: 58px 1fr;
  gap: 20px;
  align-items: start;
  min-height: 260px;
  padding: clamp(22px, 4vw, 34px);
  border: 1px solid rgba(222, 216, 204, 0.92);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: 0 16px 46px rgba(44, 36, 31, 0.09);
  transition: transform 0.28s ease, border-color 0.28s ease, box-shadow 0.28s ease, background 0.28s ease;
}

.workflow-step-card::before {
  content: "";
  position: absolute;
  top: 44px;
  left: -41px;
  width: 14px;
  height: 14px;
  border: 3px solid var(--surface);
  border-radius: 999px;
  background: var(--border-strong);
  box-shadow: 0 0 0 1px var(--border);
  transition: background 0.25s ease, box-shadow 0.25s ease;
}

.workflow-step-card.is-active,
.workflow-step-card.is-complete {
  border-color: rgba(47, 93, 70, 0.45);
  background: rgba(255, 255, 255, 0.96);
}

.workflow-step-card.is-active {
  transform: translateY(-4px);
  box-shadow: 0 24px 70px rgba(47, 93, 70, 0.16);
}

.workflow-step-card.is-active::before,
.workflow-step-card.is-complete::before {
  background: var(--primary);
  box-shadow: 0 0 0 7px rgba(47, 93, 70, 0.12);
}

.step-number {
  display: grid;
  place-items: center;
  width: 58px;
  height: 58px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 850;
}

.workflow-step-card.is-active .step-number {
  background: var(--primary);
  color: #fff;
}

.workflow-step-card h3 {
  margin: 0 0 10px;
  color: var(--text);
  font-size: clamp(1.35rem, 2.4vw, 2rem);
  line-height: 1.1;
}

.workflow-step-card p,
.method-copy p,
.clue-card p,
.clue-card small,
.resource-card-v2 small,
.data-status-card p,
.responsible-grid li {
  color: var(--text-muted);
  line-height: 1.62;
}

.story-heading {
  display: grid;
  gap: 10px;
  max-width: 780px;
  margin-bottom: 24px;
}

.clue-grid,
.responsible-grid,
.resource-grid-v2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.clue-card,
.resource-card-v2 {
  display: grid;
  gap: 10px;
  align-content: start;
  justify-items: start;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 14px 38px rgba(44, 36, 31, 0.09);
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.clue-card:hover,
.clue-card:focus-within,
.resource-card-v2:hover,
.resource-card-v2:focus-visible {
  transform: translateY(-4px);
  border-color: rgba(47, 93, 70, 0.45);
  box-shadow: 0 22px 54px rgba(47, 93, 70, 0.14);
}

.clue-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  min-height: 28px;
  border-radius: 999px;
  padding: 5px 10px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 0.72rem;
  font-weight: 850;
}

.clue-card strong,
.resource-card-v2 strong {
  color: var(--text);
  font-size: 1.15rem;
  line-height: 1.22;
}

.clue-card p,
.clue-card small {
  margin: 0;
}

.clue-card small {
  padding-top: 12px;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
}

.method-section {
  padding: clamp(26px, 5vw, 52px);
  border: 1px solid var(--border);
  border-radius: 20px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.94), rgba(241, 238, 231, 0.84)),
    var(--surface);
  box-shadow: 0 22px 70px rgba(44, 36, 31, 0.12);
}

.method-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.85fr);
  gap: clamp(24px, 5vw, 56px);
  align-items: start;
}

.method-copy {
  display: grid;
  gap: 0;
}

.method-copy div {
  padding: 18px 0;
  border-top: 1px solid var(--border);
}

.method-copy div:first-child {
  border-top: 0;
  padding-top: 0;
}

.method-copy h3 {
  margin: 0 0 6px;
  color: var(--text);
  font-size: 1.05rem;
}

.method-copy p {
  margin: 0;
}

.matrix-visual {
  display: grid;
  gap: 10px;
  padding: 18px;
  border: 1px solid rgba(47, 93, 70, 0.22);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.86);
}

.matrix-title {
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 850;
  text-transform: uppercase;
}

.matrix-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
}

.matrix-row strong {
  color: var(--text);
}

.matrix-row span {
  color: var(--text-muted);
  font-weight: 700;
}

.threshold-example {
  margin-top: 8px;
  padding: 16px;
  border-radius: 14px;
  background: var(--primary-soft);
  color: var(--text);
}

.threshold-example > span {
  display: inline-flex;
  margin-bottom: 10px;
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 850;
  text-transform: uppercase;
}

.threshold-example dl {
  display: grid;
  gap: 8px;
  margin: 0;
}

.threshold-example div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
}

.threshold-example dd {
  margin: 0;
  font-weight: 850;
}

.threshold-example div:last-child dd {
  color: var(--danger);
}

.threshold-demo {
  display: grid;
  gap: 24px;
  margin-top: 42px;
  padding: clamp(22px, 4vw, 34px);
  border: 1px solid rgba(47, 93, 70, 0.22);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.78);
}

.threshold-demo-copy h3 {
  max-width: 680px;
  font-size: clamp(1.55rem, 3vw, 2.45rem);
}

.threshold-track {
  position: relative;
  display: grid;
  grid-template-columns: 62% 18% 20%;
  min-height: 124px;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface);
}

.zone {
  display: flex;
  align-items: flex-end;
  padding: 16px;
  color: rgba(44, 36, 31, 0.68);
  font-size: 0.78rem;
  font-weight: 850;
  text-transform: uppercase;
}

.zone-below {
  background: linear-gradient(180deg, rgba(37, 131, 76, 0.16), rgba(37, 131, 76, 0.06));
}

.zone-borderline {
  background: linear-gradient(180deg, rgba(217, 154, 0, 0.22), rgba(217, 154, 0, 0.08));
}

.zone-exceeds {
  background: linear-gradient(180deg, rgba(179, 58, 47, 0.22), rgba(179, 58, 47, 0.08));
}

.threshold-marker {
  position: absolute;
  top: 12px;
  bottom: 12px;
  left: 62%;
  width: 2px;
  background: var(--text);
}

.threshold-marker em {
  position: absolute;
  top: 0;
  left: 10px;
  color: var(--text);
  font-size: 0.8rem;
  font-style: normal;
  font-weight: 850;
  white-space: nowrap;
}

.threshold-measure {
  position: absolute;
  left: 0;
  top: 52px;
  width: min(calc(var(--measure-progress) * 82%), 82%);
  height: 18px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--success), #d99a00 74%, var(--danger));
  box-shadow: 0 10px 22px rgba(47, 93, 70, 0.18);
}

.threshold-measure em {
  position: absolute;
  left: 14px;
  bottom: 24px;
  color: var(--primary);
  font-size: 0.82rem;
  font-style: normal;
  font-weight: 850;
  white-space: nowrap;
}

.esa-flow-v2 {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: esa-step;
}

.esa-flow-v2 li {
  position: relative;
  min-height: 122px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 12px 34px rgba(44, 36, 31, 0.08);
}

.esa-flow-v2 li:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -12px;
  width: 12px;
  height: 2px;
  background: var(--border-strong);
}

.esa-flow-v2 li::before {
  counter-increment: esa-step;
  content: counter(esa-step);
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  margin-bottom: 14px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 850;
}

.esa-flow-v2 span {
  color: var(--text);
  font-weight: 800;
  line-height: 1.35;
}

.data-status-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 18px;
  align-items: start;
  padding: 24px;
  border: 1px solid rgba(47, 93, 70, 0.3);
  border-radius: 18px;
  background: rgba(231, 241, 235, 0.9);
  box-shadow: 0 14px 44px rgba(47, 93, 70, 0.12);
}

.status-dot {
  width: 14px;
  height: 14px;
  margin-top: 8px;
  border-radius: 999px;
  background: var(--success);
  box-shadow: 0 0 0 8px rgba(37, 131, 76, 0.12);
}

.data-status-card span {
  display: block;
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 850;
  text-transform: uppercase;
}

.data-status-card strong {
  display: block;
  margin-top: 4px;
  color: var(--text);
  font-size: clamp(1.3rem, 2.5vw, 2rem);
}

.data-status-card p {
  max-width: 760px;
  margin: 8px 0 0;
}

.responsible-use {
  padding: clamp(24px, 4vw, 42px);
  border: 1px solid var(--warning-border);
  border-radius: 18px;
  background: rgba(248, 235, 227, 0.88);
  box-shadow: 0 14px 42px rgba(138, 74, 35, 0.08);
}

.responsible-use .story-heading {
  max-width: none;
}

@media (min-width: 900px) {
  .responsible-use .story-heading h2 {
    white-space: nowrap;
  }
}

.responsible-grid {
  margin-top: 18px;
}

.responsible-grid > div {
  padding: 20px;
  border: 1px solid rgba(231, 181, 149, 0.9);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.54);
}

.responsible-grid h3 {
  margin: 0 0 10px;
  color: var(--warning-text);
}

.responsible-grid ul {
  margin: 0;
  padding-left: 20px;
}

.responsible-grid li + li {
  margin-top: 8px;
}

.resource-card-v2 {
  position: relative;
  min-height: 170px;
  padding-right: 54px;
  color: var(--text);
  text-decoration: none;
}

.resource-card-v2 span {
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 850;
  text-transform: uppercase;
}

.resource-card-v2 .icon {
  position: absolute;
  top: 24px;
  right: 24px;
  color: var(--primary);
}

html.dark .about-page,
html.dark.about-page {
  background:
    linear-gradient(rgba(29, 24, 21, 0.78), rgba(29, 24, 21, 0.78)),
    url("assets/images/background-image.avif") center / cover fixed;
}

@media (max-width: 1024px) {
  .about-page,
  html.dark .about-page,
  html.dark.about-page {
    background-color: var(--bg);
    background-image:
      radial-gradient(circle at 18% 0%, rgba(231, 241, 235, 0.88), transparent 24rem),
      linear-gradient(180deg, rgba(237, 243, 240, 0.96) 0%, rgba(248, 247, 243, 0.98) 320px, var(--bg) 100%);
    background-position: center top, center top;
    background-size: auto, auto;
    background-repeat: no-repeat, no-repeat;
    background-attachment: scroll, scroll;
  }
}

html.dark .purpose-panel,
html.dark .workflow-step-card,
html.dark .clue-card,
html.dark .method-section,
html.dark .matrix-visual,
html.dark .threshold-demo,
html.dark .esa-flow-v2 li,
html.dark .resource-card-v2 {
  background: rgba(40, 33, 29, 0.94);
}

html.dark .threshold-track,
html.dark .matrix-row {
  background: var(--surface-soft);
}

html.dark .data-status-card {
  background: rgba(32, 56, 43, 0.92);
}

html.dark .responsible-use {
  background: rgba(56, 41, 31, 0.9);
}

@media (max-width: 980px) {
  .tool-intro-panel,
  .purpose-panel,
  .scroll-story,
  .method-split {
    grid-template-columns: 1fr;
  }

  .tool-intro-panel,
  .purpose-panel {
    grid-template-columns: minmax(24px, 1fr) minmax(0, 720px) minmax(24px, 1fr);
    gap: 26px;
    padding: 54px 0;
  }

  .tool-intro-statement,
  .tool-intro-copy,
  .purpose-statement,
  .purpose-panel > p {
    grid-column: 2;
  }

  .tool-intro-copy,
  .purpose-panel > p {
    max-width: 640px;
    padding-top: 0;
  }

  .scroll-story {
    min-height: auto;
    padding: 32px 0;
  }

  .story-sticky {
    position: relative;
    top: auto;
    min-height: 0;
  }

  .workflow-timeline {
    padding: 12px 0 0 42px;
  }

  .timeline-rail {
    top: 12px;
    bottom: 0;
  }

  .clue-grid,
  .responsible-grid,
  .resource-grid-v2,
  .esa-flow-v2 {
    grid-template-columns: 1fr;
  }

  .esa-flow-v2 li:not(:last-child)::after {
    top: auto;
    right: auto;
    bottom: -12px;
    left: 32px;
    width: 2px;
    height: 12px;
  }
}

@media (max-width: 640px) {
  .about-story {
    width: 100%;
    padding-bottom: 56px;
    overflow-x: hidden;
  }

  .method-section,
  .responsible-use {
    border-radius: 14px;
    padding: 22px;
  }

  .about-back-row {
    width: min(calc(100% - 32px), var(--story-wide));
  }

  .tool-intro-panel {
    grid-template-columns: minmax(16px, 1fr) minmax(0, 358px) minmax(16px, 1fr);
    gap: 24px;
    padding: 38px 0 46px;
  }

  .tool-intro-statement,
  .tool-intro-copy {
    grid-column: 2;
    max-width: 100%;
    min-width: 0;
    padding-top: 0;
  }

  .tool-intro-statement h1 {
    max-width: 100%;
    font-size: clamp(2.9rem, 13vw, 3.55rem);
    line-height: 0.98;
    letter-spacing: -0.045em;
  }

  .tool-intro-copy p {
    max-width: 100%;
    font-size: 1rem;
    line-height: 1.68;
  }

  .definition-term::after {
    right: auto;
    left: 50%;
    transform: translate(-50%, 8px);
  }

  .definition-term:hover::after,
  .definition-term:focus-visible::after {
    transform: translate(-50%, 0);
  }

  .tool-phase-circles {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    width: 100%;
    max-width: 100%;
  }

  .tool-phase-circle {
    width: min(100%, 106px);
    height: auto;
    aspect-ratio: 1;
    justify-self: center;
  }

  .tool-phase-circle strong {
    font-size: 0.8rem;
  }

  .tool-phase-circle span {
    max-width: 74px;
    font-size: 0.68rem;
    font-weight: 400;
  }

  .purpose-panel {
    grid-template-columns: minmax(18px, 1fr) minmax(0, 1fr) minmax(18px, 1fr);
    padding: 48px 0 60px;
  }

  .purpose-statement h2 {
    font-size: clamp(2.15rem, 11vw, 3.8rem);
  }

  .purpose-panel p {
    font-size: 1rem;
    line-height: 1.75;
  }

  .workflow-timeline {
    gap: 18px;
    padding-left: 34px;
  }

  .workflow-step-card {
    grid-template-columns: 1fr;
    min-height: auto;
    gap: 14px;
  }

  .workflow-step-card::before {
    left: -29px;
  }

  .step-number {
    width: 44px;
    height: 44px;
  }

  .threshold-track {
    grid-template-columns: 60% 20% 20%;
    min-height: 150px;
  }

  .zone {
    align-items: flex-end;
    justify-content: center;
    padding: 10px 6px;
    font-size: 0.66rem;
    writing-mode: vertical-rl;
    transform: rotate(180deg);
  }

  .threshold-marker {
    left: 60%;
  }

  .threshold-marker em {
    left: -64px;
    top: -4px;
  }

  .threshold-measure em {
    left: 8px;
  }

  .matrix-row,
  .threshold-example div {
    display: grid;
    gap: 4px;
  }
}

@media (max-width: 768px) {
  .about-page,
  html.dark .about-page,
  html.dark.about-page {
    background-color: var(--bg);
    background-image:
      radial-gradient(circle at 18% 0%, rgba(231, 241, 235, 0.88), transparent 24rem),
      linear-gradient(180deg, rgba(237, 243, 240, 0.96) 0%, rgba(248, 247, 243, 0.98) 320px, var(--bg) 100%);
    background-position: center top, center top;
    background-size: auto, auto;
    background-repeat: no-repeat, no-repeat;
    background-attachment: scroll, scroll;
  }

  .about-story {
    overflow-x: hidden;
  }

  .about-back-row,
  .story-card,
  .story-section,
  .scroll-story,
  .data-status-card {
    width: min(calc(100% - 40px), var(--story-max));
    max-width: calc(100% - 40px);
    margin-right: auto;
    margin-left: auto;
  }

  .tool-intro-panel,
  .purpose-panel {
    grid-template-columns: 20px minmax(0, 1fr) 20px;
    gap: 22px;
    padding-top: 42px;
    padding-bottom: 46px;
  }

  .purpose-panel.story-card {
    width: 100%;
    max-width: none;
  }

  .tool-intro-statement,
  .tool-intro-copy,
  .purpose-statement,
  .purpose-panel > p {
    grid-column: 2;
    max-width: 100%;
    min-width: 0;
  }

  .tool-intro-copy,
  .purpose-panel > p {
    padding-top: 0;
  }

  .tool-intro-statement h1,
  .purpose-statement h2,
  .story-heading h2,
  .story-sticky h2,
  .threshold-demo-copy h3 {
    max-width: 100%;
    font-size: clamp(1.9rem, 8.6vw, 2rem);
    line-height: 1.08;
    letter-spacing: -0.035em;
    overflow-wrap: normal;
  }

  .tool-intro-copy p,
  .purpose-panel p,
  .story-heading p,
  .story-sticky p,
  .workflow-step-card p,
  .clue-card p,
  .clue-card small,
  .method-copy p,
  .data-status-card p,
  .responsible-grid li {
    font-size: 1rem;
    line-height: 1.55;
  }

  .tool-phase-circles {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    width: 100%;
  }

  .scroll-story {
    grid-template-columns: 1fr;
    min-height: auto;
    gap: 24px;
    padding-top: 34px;
    padding-bottom: 46px;
  }

  .story-sticky {
    position: relative;
    top: auto;
    min-height: 0;
    padding-top: 0;
  }

  .workflow-timeline {
    padding-left: 36px;
  }

  .timeline-rail {
    left: 8px;
  }

  .workflow-step-card {
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 22px 20px;
  }

  .workflow-step-card::before {
    left: -35px;
  }

  .workflow-step-card h3 {
    font-size: 1.45rem;
  }

  .clue-grid,
  .responsible-grid,
  .resource-grid-v2,
  .method-split,
  .esa-flow-v2 {
    grid-template-columns: 1fr;
  }

  .story-heading {
    max-width: 100%;
  }

  .clue-card,
  .resource-card-v2,
  .method-section,
  .responsible-use,
  .threshold-demo,
  .data-status-card {
    border-radius: 14px;
  }

  .threshold-demo {
    overflow: hidden;
  }

  .threshold-track {
    grid-template-columns: 60% 20% 20%;
    min-height: 112px;
    overflow: hidden;
  }

  .zone {
    display: none;
  }

  .threshold-marker {
    top: 14px;
    bottom: 14px;
    left: 60%;
  }

  .threshold-marker em {
    top: 0;
    left: 8px;
    font-size: 0.7rem;
  }

  .threshold-measure {
    top: 52px;
    width: min(calc(var(--measure-progress) * 90%), 90%);
    max-width: 100%;
  }

  .threshold-measure em {
    left: 8px;
    bottom: 22px;
    font-size: 0.7rem;
  }

  .matrix-row,
  .threshold-example div {
    display: grid;
    gap: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto !important;
  }

  .animations-ready [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .workflow-step-card,
  .clue-card,
  .resource-card-v2 {
    transition: none;
  }
}