.page-about {
  --about-rail-w: 232px;
  --about-rail-top: 118px;
  position: relative;
  overflow-x: clip;
}

.page-about .about-hero {
  position: relative;
  padding: 26px 0 54px;
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -34%;
  right: -18%;
  width: 620px;
  height: 620px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.26), rgba(139, 92, 246, 0) 62%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  bottom: -180px;
  left: -140px;
  width: 380px;
  height: 380px;
  background: radial-gradient(circle, rgba(53, 224, 206, 0.14), rgba(53, 224, 206, 0) 65%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: 32px;
  margin-top: 20px;
}

.page-about .about-hero__copy h1 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 5.4vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--fog);
}

.page-about .about-hero__copy .lede {
  margin: 16px 0 0;
  max-width: 40em;
  color: var(--slate);
  font-size: 1rem;
  line-height: 1.8;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px dashed var(--line);
}

.page-about .about-hero__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.25rem, 3.4vw, 1.7rem);
  line-height: 1;
  color: var(--amber);
}

.page-about .about-hero__lab {
  display: block;
  margin-top: 6px;
  font-size: 0.75rem;
  line-height: 1.55;
  color: var(--slate);
}

.page-about .about-hero__fig {
  position: relative;
  margin: 0;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(158deg, var(--panel), var(--ink-deep));
  box-shadow: var(--shadow-panel);
}

.page-about .about-hero__fig::after {
  content: "BRAND BOOK / V2.0";
  position: absolute;
  top: -12px;
  left: 18px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  color: var(--ink);
  background: var(--paper);
  border-radius: 2px;
  transform: rotate(-2.2deg);
  box-shadow: 0 6px 14px -8px #000;
}

.page-about .about-hero__fig img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  object-fit: cover;
}

.page-about .about-hero__fig .media__caption {
  padding: 10px 4px 2px;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--slate);
}

.page-about .about-body {
  display: grid;
  gap: 32px;
  padding-top: 44px;
  padding-bottom: 72px;
}

.page-about .about-rail__label {
  margin: 0 0 12px;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--slate);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  border-left: 0;
  padding-bottom: 6px;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__list li {
  flex: none;
}

.page-about .about-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.82rem;
  line-height: 1.4;
  white-space: nowrap;
  color: var(--slate);
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-rail__list a .mono {
  font-size: 0.72rem;
  color: var(--line);
}

.page-about .about-rail__list a:hover {
  color: var(--fog);
  border-color: rgba(53, 224, 206, 0.5);
}

.page-about .about-rail__list a.is-active,
.page-about .about-rail__list a[aria-current] {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(53, 224, 206, 0.08);
}

.page-about .about-rail__list a.is-active .mono,
.page-about .about-rail__list a[aria-current] .mono {
  color: var(--cyan);
}

.page-about .about-rail__note {
  margin: 16px 0 0;
  padding-left: 12px;
  border-left: 2px solid rgba(242, 184, 75, 0.45);
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .about-chapter {
  position: relative;
  scroll-margin-top: 104px;
  padding-bottom: 48px;
}

.page-about .about-chapter + .about-chapter {
  padding-top: 48px;
  border-top: 1px dashed var(--line);
}

.page-about .about-chapter:last-child {
  padding-bottom: 0;
}

.page-about .about-chapter__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 20px;
}

.page-about .chapter-no {
  flex: none;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2rem, 5.6vw, 3rem);
  line-height: 0.9;
  letter-spacing: 0.02em;
  color: transparent;
  -webkit-text-stroke: 1px var(--cyan);
  padding-top: 2px;
}

.page-about .about-chapter__title h2 {
  margin: 6px 0 0;
  font-size: clamp(1.3rem, 3.4vw, 1.85rem);
  font-weight: 800;
  line-height: 1.3;
  color: var(--fog);
}

.page-about .about-chapter__body p {
  margin: 0 0 14px;
  max-width: 40em;
  font-size: 0.98rem;
  line-height: 1.85;
  color: rgba(234, 243, 255, 0.86);
}

.page-about .about-chapter__body p:last-child {
  margin-bottom: 0;
}

.page-about .about-audience {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 20px;
}

.page-about .about-aud {
  position: relative;
  padding-top: 22px;
}

.page-about .about-aud__tag {
  position: absolute;
  top: 10px;
  right: 12px;
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: var(--line);
}

.page-about .about-aud__title {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--fog);
}

.page-about .about-aud__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--slate);
}

.page-about .about-tl {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .about-tl__item {
  position: relative;
  display: grid;
  gap: 8px;
  padding: 18px 0 18px 22px;
  border-left: 1px solid var(--line);
  transition: background 0.2s var(--ease);
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 26px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 224, 206, 0.08);
  transition: background 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .about-tl__item:hover::before {
  background: var(--cyan);
  box-shadow: 0 0 0 6px rgba(53, 224, 206, 0.14);
}

.page-about .about-tl__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.45rem, 4vw, 2.1rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--amber);
}

.page-about .about-tl__h {
  margin: 0 0 6px;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--fog);
  transition: color 0.2s var(--ease);
}

.page-about .about-tl__item:hover .about-tl__h {
  color: var(--cyan);
}

.page-about .about-tl__p {
  margin: 0;
  max-width: 38em;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--slate);
}

.page-about .about-tl-fig {
  margin: 28px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 8px;
  background: linear-gradient(160deg, var(--panel-up), var(--ink-deep));
  box-shadow: var(--shadow-panel);
}

.page-about .about-tl-fig img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  object-fit: cover;
}

.page-about .about-tl-fig .media__caption {
  padding: 9px 4px 2px;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--slate);
}

.page-about .about-team {
  display: grid;
  gap: 24px;
  margin-top: 20px;
}

.page-about .about-team__fig {
  position: relative;
  margin: 0;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(150deg, var(--panel-up), var(--ink-deep));
  box-shadow: var(--shadow-panel);
}

.page-about .about-team__fig::after {
  content: "RHYTHM";
  position: absolute;
  right: 16px;
  bottom: -10px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.18em;
  color: var(--ink);
  background: var(--paper);
  border-radius: 2px;
  transform: rotate(1.6deg);
  box-shadow: 0 6px 14px -8px #000;
}

.page-about .about-team__fig img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  object-fit: cover;
}

.page-about .about-team__fig .media__caption {
  padding: 9px 4px 2px;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--slate);
}

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-team__list li {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 13px 0;
  border-bottom: 1px solid rgba(30, 94, 102, 0.55);
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.1rem;
  line-height: 1.2;
  color: var(--cyan);
}

.page-about .about-team__txt {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .about-support {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-support__item {
  position: relative;
  padding: 18px 18px 18px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: linear-gradient(160deg, rgba(11, 27, 47, 0.95), rgba(4, 12, 22, 0.9));
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-support__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan), rgba(53, 224, 206, 0));
}

.page-about .about-support__item:hover {
  border-color: rgba(53, 224, 206, 0.5);
  transform: translateY(-2px);
}

.page-about .about-support__k {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--amber);
}

.page-about .about-support__h {
  margin: 0 0 7px;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--fog);
}

.page-about .about-support__p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--slate);
}

.page-about .about-steps {
  margin-top: 22px;
  padding: 18px 18px 20px;
  border: 1px dashed rgba(53, 224, 206, 0.45);
  border-radius: var(--radius);
  background: rgba(53, 224, 206, 0.04);
}

.page-about .about-steps__label {
  margin: 0 0 14px;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-steps__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-steps__list li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
}

.page-about .about-steps__no {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--amber);
  letter-spacing: 0.1em;
}

.page-about .about-steps__txt {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--fog);
}

.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 20px;
}

.page-about .about-partner {
  position: relative;
  padding: 18px 18px 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: linear-gradient(150deg, var(--panel), var(--ink-deep));
}

.page-about .about-partner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 18px;
  right: 18px;
  height: 1px;
  background: linear-gradient(90deg, rgba(139, 92, 246, 0.7), rgba(53, 224, 206, 0));
}

.page-about .about-partner__h {
  margin: 0 0 7px;
  font-size: 0.98rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--fog);
}

.page-about .about-partner__p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--slate);
}

.page-about .about-cta {
  display: grid;
  gap: 14px;
  justify-items: start;
  margin-top: 24px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 38em;
  font-size: 0.94rem;
  line-height: 1.8;
  color: rgba(234, 243, 255, 0.82);
}

@media (min-width: 620px) {
  .page-about .about-audience {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 720px) {
  .page-about .about-tl__item {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 26px;
    align-items: start;
    padding: 20px 0 20px 26px;
  }

  .page-about .about-tl__item::before {
    top: 30px;
  }

  .page-about .about-hero__stats {
    gap: 20px;
  }
}

@media (min-width: 860px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: 32px;
    align-items: start;
  }

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    justify-items: end;
    gap: 24px;
  }

  .page-about .about-cta__text {
    justify-self: start;
  }
}

@media (min-width: 920px) {
  .page-about .about-hero {
    padding: 34px 0 64px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    gap: 52px;
    align-items: center;
    margin-top: 26px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 58px;
    padding-top: 54px;
  }

  .page-about .about-rail {
    position: sticky;
    top: var(--about-rail-top);
    align-self: start;
  }

  .page-about .about-rail__list {
    display: grid;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-rail__list li {
    flex: initial;
  }

  .page-about .about-rail__list a {
    border: 0;
    border-radius: 0;
    border-left: 2px solid transparent;
    margin-left: -1px;
    padding: 10px 12px;
    white-space: normal;
    font-size: 0.88rem;
    line-height: 1.5;
  }

  .page-about .about-rail__list a:hover {
    background: rgba(53, 224, 206, 0.06);
    border-left-color: rgba(53, 224, 206, 0.4);
  }

  .page-about .about-rail__list a.is-active,
  .page-about .about-rail__list a[aria-current] {
    background: rgba(53, 224, 206, 0.08);
    border-left-color: var(--cyan);
  }

  .page-about .about-rail__note {
    margin-top: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__item,
  .page-about .about-support__item,
  .page-about .about-tl__h,
  .page-about .about-tl__item::before,
  .page-about .about-rail__list a {
    transition: none;
  }

  .page-about .about-support__item:hover {
    transform: none;
  }
}
<<<END>>>