.page-about {
  --ab-gap: clamp(28px, 4.5vw, 52px);
}

.page-about .ab-crumb {
  padding-top: clamp(16px, 3vw, 30px);
}

/* ---------- Hero ---------- */
.page-about .ab-hero {
  display: grid;
  gap: 26px;
  padding-block: clamp(22px, 4vw, 44px) clamp(30px, 5vw, 60px);
}

.page-about .ab-hero__lead {
  min-width: 0;
}

.page-about .ab-hero__title {
  margin: 12px 0 0;
  max-width: 18ch;
  letter-spacing: -0.02em;
}

.page-about .ab-hero__sub {
  margin: 20px 0 0;
  color: var(--gray-300);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  max-width: 56ch;
}

.page-about .ab-hero__preview {
  position: relative;
  min-width: 0;
  padding: clamp(18px, 3vw, 28px);
  border-radius: var(--r-lg);
  border: 1px solid var(--line-mid);
}

.page-about .ab-preview__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan-400);
}

.page-about .ab-preview {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .ab-preview a {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  align-items: baseline;
  gap: 8px;
  padding: 9px 12px;
  border-radius: 999px;
  color: var(--paper);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.5;
  transition: background var(--dur-1) var(--ease), color var(--dur-1) var(--ease);
}

.page-about .ab-preview a:hover,
.page-about .ab-preview a:focus-visible {
  background: var(--ink-700);
  color: var(--orange-300);
}

.page-about .ab-preview__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange-500);
}

.page-about .ab-annot {
  display: none;
}

/* ---------- Section shell ---------- */
.page-about .ab-sec {
  margin-top: var(--ab-gap);
  padding: clamp(22px, 4vw, 44px);
  border-radius: var(--r-xl);
  overflow: hidden;
}

.page-about .ab-sec > * {
  min-width: 0;
}

.page-about .ab-sec__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 6px;
}

.page-about .ab-sec__head .section-num {
  font-size: clamp(20px, 3vw, 30px);
  color: var(--orange-500);
  line-height: 1;
}

.page-about .ab-sec__title {
  margin: 0;
  font-size: clamp(23px, 3.4vw, 36px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

.page-about .ab-sec__text {
  margin: 14px 0 0;
  color: var(--gray-300);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  max-width: 68ch;
}

.page-about .ab-sec__text--after {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-sec__text a {
  color: var(--cyan-400);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .ab-sec__text a:hover {
  color: var(--orange-300);
}

/* ---------- 01 situations ---------- */
.page-about .ab-needs {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-need {
  display: grid;
  gap: 8px;
  padding: 16px 18px;
  background: var(--ink-700);
  border-radius: var(--r-md);
  border-left: 3px solid var(--orange-500);
}

.page-about .ab-need__n {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan-400);
}

.page-about .ab-need p {
  margin: 0;
  color: var(--gray-300);
  font-size: 15px;
  line-height: 1.75;
}

.page-about .ab-need strong {
  color: var(--paper);
  display: block;
  margin-bottom: 4px;
}

/* ---------- 02 team ---------- */
.page-about .ab-team {
  display: grid;
  gap: 22px;
  margin-top: 8px;
}

.page-about .ab-team__col {
  min-width: 0;
}

.page-about .ab-team__group {
  margin-top: 14px;
  padding: 16px 18px;
  background: var(--ink-700);
  border-radius: var(--r-md);
  border: 1px solid var(--line-soft);
}

.page-about .ab-team__group p {
  margin: 10px 0 0;
  color: var(--gray-300);
  font-size: 15px;
  line-height: 1.75;
}

.page-about .ab-team__tag {
  display: inline-block;
  padding: 4px 13px;
  border-radius: 999px;
  border: 1px solid rgba(47, 227, 208, 0.5);
  color: var(--cyan-400);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.page-about .ab-media {
  margin: 22px 0 0;
  min-width: 0;
}

.page-about .ab-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .ab-media .media__caption {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--gray-300);
  line-height: 1.6;
}

/* ---------- 03 timeline ---------- */
.page-about .ab-tl {
  position: relative;
  list-style: none;
  margin: 24px 0 0;
  padding: 0 0 0 26px;
  display: grid;
  gap: 16px;
}

.page-about .ab-tl__curve {
  position: absolute;
  left: 0;
  top: 0;
  width: 14px;
  height: 100%;
  pointer-events: none;
}

.page-about .ab-tl__curve path {
  fill: none;
  stroke: var(--orange-500);
  stroke-width: 1.5;
  opacity: 0.45;
  vector-effect: non-scaling-stroke;
}

.page-about .ab-tl__item {
  position: relative;
  display: grid;
  gap: 8px;
}

.page-about .ab-tl__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(17px, 2.2vw, 21px);
  letter-spacing: 0.06em;
  color: var(--orange-500);
}

.page-about .ab-tl__panel {
  padding: 16px 18px;
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
}

.page-about .ab-tl__panel h3 {
  margin: 0 0 8px;
  font-size: clamp(16px, 2vw, 19px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ab-tl__panel p {
  margin: 0;
  color: var(--gray-300);
  font-size: 15px;
  line-height: 1.75;
}

.page-about .ab-fold__btn {
  margin-top: 12px;
  padding: 5px 15px;
  background: transparent;
  border: 1px solid rgba(255, 154, 92, 0.5);
  border-radius: 999px;
  color: var(--orange-300);
  font-family: inherit;
  font-size: 13px;
  line-height: 1.6;
  cursor: pointer;
  transition: border-color var(--dur-1) var(--ease), color var(--dur-1) var(--ease);
}

.page-about .ab-fold__btn:hover,
.page-about .ab-fold__btn:focus-visible {
  border-color: var(--orange-500);
  color: var(--orange-500);
}

.page-about .ab-fold__btn:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 2px;
}

.page-about .ab-tl__more {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  color: var(--gray-300);
  font-size: 14px;
  line-height: 1.75;
}

.page-about .ab-media--tl {
  margin-top: 26px;
}

/* ---------- 04 structure ---------- */
.page-about .ab-shift {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}

.page-about .ab-shift__item {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  padding: 16px 20px;
  background: var(--ink-700);
  border-radius: var(--r-md);
  border: 1px solid var(--line-soft);
}

.page-about .ab-shift__num {
  font-family: var(--font-mono);
  font-size: clamp(38px, 7vw, 60px);
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
  letter-spacing: -0.02em;
}

.page-about .ab-shift__num--to {
  color: var(--orange-500);
}

.page-about .ab-shift__arrow {
  font-family: var(--font-mono);
  font-size: 22px;
  color: var(--gray-300);
}

.page-about .ab-shift__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan-400);
  margin-left: auto;
}

.page-about .ab-gains {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-gains li {
  padding: 12px 0 12px 16px;
  border-left: 2px solid var(--cyan-400);
  color: var(--gray-300);
  font-size: 15px;
  line-height: 1.75;
}

.page-about .ab-gains strong {
  color: var(--paper);
}

/* ---------- 05 partners ---------- */
.page-about .ab-partners {
  display: grid;
  gap: 22px;
  margin-top: 8px;
}

.page-about .ab-partners__main {
  min-width: 0;
}

.page-about .ab-honor {
  padding: 18px 20px;
  border-radius: var(--r-md);
  border: 1px solid rgba(255, 106, 26, 0.45);
  background: rgba(255, 106, 26, 0.07);
}

.page-about .ab-honor .kicker {
  margin: 0 0 8px;
}

.page-about .ab-honor__title {
  margin: 0;
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 800;
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-about .ab-honor__meta {
  margin: 8px 0 0;
  font-size: 13px;
  color: var(--gray-300);
  line-height: 1.7;
}

.page-about .ab-figures {
  list-style: none;
  margin: 24px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line-soft);
  display: grid;
  gap: 14px;
}

.page-about .ab-figures li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.page-about .ab-figures__num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.8vw, 26px);
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-figures__label {
  font-size: 13px;
  color: var(--gray-300);
  letter-spacing: 0.02em;
}

/* ---------- 06 revision + next ---------- */
.page-about .ab-next {
  margin-top: 26px;
  padding: 18px 20px;
  border-radius: var(--r-lg);
  background: var(--ink-700);
  border: 1px solid var(--line-soft);
}

.page-about .ab-next__title {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan-400);
}

.page-about .ab-next a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
  color: var(--paper);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.6;
  transition: color var(--dur-1) var(--ease);
}

.page-about .ab-next a:last-of-type {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .ab-next a:hover,
.page-about .ab-next a:focus-visible {
  color: var(--orange-300);
}

.page-about .ab-next__arrow {
  flex: none;
  font-family: var(--font-mono);
  color: var(--orange-500);
}

.page-about .ab-updated {
  margin: 22px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gray-300);
}

/* ---------- responsive ---------- */
@media (min-width: 640px) {
  .page-about .ab-needs {
    gap: 14px;
  }

  .page-about .ab-figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .ab-figures li {
    flex-direction: column;
    gap: 4px;
  }

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

  .page-about .ab-shift__label {
    margin-left: 0;
  }
}

@media (min-width: 860px) {
  .page-about .ab-hero {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .ab-needs {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 28px;
    align-items: start;
  }

  .page-about .ab-team .ab-media {
    margin-top: 0;
  }

  .page-about .ab-partners {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 28px;
    align-items: start;
  }

  .page-about .ab-tl__item {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 22px;
    align-items: start;
  }

  .page-about .ab-sec--offset {
    margin-left: clamp(0px, 3vw, 36px);
  }

  .page-about .ab-media--tl {
    max-width: 760px;
    margin-left: auto;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-annot {
    display: block;
    position: absolute;
    top: 26px;
    right: -26px;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.24em;
    color: var(--cyan-400);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-preview a,
  .page-about .ab-fold__btn,
  .page-about .ab-next a {
    transition: none;
  }
}
<<<END>>>