.page-about {
  --about-hair: rgba(97, 242, 208, .28);
  --about-dim: rgba(247, 232, 214, .72);
  --about-line-paper: rgba(36, 26, 21, .14);
  overflow-x: hidden;
}

.page-about .about-crumbs {
  padding-block: 1.35rem .5rem;
}

.page-about .about-crumbs .breadcrumbs__link,
.page-about .about-crumbs .breadcrumbs__current {
  color: var(--about-dim);
  font-size: .8rem;
  letter-spacing: .04em;
}

.page-about .about-crumbs .breadcrumbs__link:hover,
.page-about .about-crumbs .breadcrumbs__link:focus-visible {
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-bottom: clamp(2.5rem, 7vw, 5rem);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(13, 53, 82, .95) 0%, rgba(6, 24, 38, 0) 62%),
    var(--night);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset-inline: -10%;
  bottom: -1px;
  height: clamp(48px, 9vw, 110px);
  background: var(--navy);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  opacity: .55;
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
  padding-top: clamp(.75rem, 2vw, 1.5rem);
  position: relative;
  z-index: 1;
}

.page-about .about-hero__eyebrow {
  color: var(--cyan);
  letter-spacing: .18em;
  font-size: .74rem;
  text-transform: uppercase;
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.95rem, 6.4vw, 3.5rem);
  line-height: 1.2;
  letter-spacing: -.015em;
  color: var(--cream);
  margin: .7rem 0 0;
  max-width: 20ch;
}

.page-about .about-hero__lede {
  margin: 1.15rem 0 0;
  color: var(--about-dim);
  font-size: clamp(.95rem, 2.6vw, 1.05rem);
  line-height: 1.85;
  max-width: 46ch;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 1.9rem 0 0;
  padding: 1.15rem 0 0;
  border-top: 1px solid var(--line-cream);
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem 1.9rem;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: .25rem;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 4vw, 1.6rem);
  font-weight: 700;
  color: var(--cyan);
  line-height: 1;
}

.page-about .about-fact__label {
  font-size: .78rem;
  color: var(--slate);
  letter-spacing: .06em;
}

.page-about .about-hero__media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  transform: rotate(-1.2deg);
  box-shadow: 0 24px 60px -32px rgba(0, 0, 0, .9);
}

.page-about .about-hero__media .media-frame__img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

/* ---------- 章节头 ---------- */
.page-about .about-head {
  max-width: 62ch;
  margin-bottom: clamp(1.8rem, 4.5vw, 3rem);
}

.page-about .about-head .marker-number {
  color: var(--coral);
  font-family: var(--font-mono);
  font-size: .95rem;
  font-weight: 700;
  margin-right: .55rem;
  letter-spacing: .05em;
}

.page-about .about-head .section-head__title {
  margin-top: .55rem;
  font-size: clamp(1.45rem, 4.4vw, 2.3rem);
  line-height: 1.28;
  letter-spacing: -.01em;
}

.page-about .about-head .section-head__note {
  margin-top: .9rem;
  line-height: 1.85;
  font-size: clamp(.92rem, 2.4vw, 1rem);
}

.page-about .about-head--light .section-head__title {
  color: var(--cream);
}

.page-about .about-head--light .section-head__note,
.page-about .about-head--light .section-head__eyebrow {
  color: var(--about-dim);
}

.page-about .about-head--light .section-head__eyebrow {
  letter-spacing: .14em;
  font-size: .76rem;
}

/* ---------- 方法 ---------- */
.page-about .about-method {
  background:
    linear-gradient(180deg, var(--navy) 0%, var(--night) 100%);
  color: var(--cream);
  padding-block: clamp(2.6rem, 7vw, 5rem);
}

.page-about .about-method .section-head__title {
  color: var(--cream);
}

.page-about .about-method .section-head__note {
  color: var(--about-dim);
}

.page-about .about-method .section-head__eyebrow {
  color: var(--cyan);
  letter-spacing: .14em;
  font-size: .76rem;
}

.page-about .about-method__grid {
  align-items: start;
  gap: clamp(1.8rem, 4vw, 3rem);
}

.page-about .about-method__text p {
  margin: 0 0 1rem;
  line-height: 1.9;
  color: var(--about-dim);
  font-size: clamp(.94rem, 2.4vw, 1rem);
}

.page-about .about-method__points {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: .85rem;
}

.page-about .about-method__points li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: .75rem;
  align-items: baseline;
  line-height: 1.7;
  font-size: .92rem;
  color: var(--about-dim);
  padding-bottom: .85rem;
  border-bottom: 1px solid var(--line-cream);
}

.page-about .about-method__aside {
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-lg);
  padding: clamp(1.1rem, 3vw, 1.6rem);
  background: rgba(6, 24, 38, .55);
}

.page-about .about-method__subtitle {
  font-size: .95rem;
  letter-spacing: .08em;
  color: var(--cream);
  margin: 0 0 .9rem;
}

.page-about .about-map {
  width: 100%;
  height: auto;
  display: block;
  overflow: visible;
}

.page-about .about-map__node rect {
  fill: rgba(97, 242, 208, .05);
  stroke: var(--about-hair);
  stroke-width: 1.5;
  transition: stroke .2s var(--ease), fill .2s var(--ease);
}

.page-about .about-map__node text {
  fill: var(--cyan);
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: .04em;
}

.page-about .about-map__node:focus {
  outline: none;
}

.page-about .about-map__node:focus rect,
.page-about .about-map__node:hover rect {
  stroke: var(--coral);
  fill: rgba(255, 107, 58, .12);
}

.page-about .about-map__link {
  stroke: var(--cyan);
  stroke-width: 1.5;
  stroke-dasharray: 5 5;
  opacity: .5;
}

.page-about .about-map__note {
  fill: var(--slate);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .05em;
}

.page-about .about-method__caption {
  margin: 1rem 0 0;
  font-size: .84rem;
  line-height: 1.75;
  color: var(--slate);
}

.page-about .about-method__figure {
  margin: clamp(2rem, 5vw, 3rem) 0 0;
  display: grid;
  gap: .9rem;
}

.page-about .about-square {
  border-radius: var(--radius-md);
  overflow: hidden;
  max-width: 460px;
}

.page-about .about-square .media-frame__img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.page-about .about-method__figcap {
  font-size: .82rem;
  color: var(--slate);
  letter-spacing: .03em;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--cream);
  color: var(--ink);
  padding-block: clamp(2.6rem, 7vw, 5rem);
}

.page-about .about-team .section-head__title {
  color: var(--ink);
}

.page-about .about-team .section-head__note {
  color: #5a4b42;
}

.page-about .about-team .section-head__eyebrow {
  color: var(--red);
  letter-spacing: .14em;
  font-size: .76rem;
}

.page-about .about-roles {
  display: grid;
  gap: .8rem;
}

.page-about .about-role {
  background: #fffaf3;
  border: 1px solid var(--about-line-paper);
  border-radius: var(--radius-md);
  transition: transform .22s var(--ease), box-shadow .22s var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role[open] {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px -22px rgba(36, 26, 21, .55);
}

.page-about .about-role__summary {
  cursor: pointer;
  list-style: none;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: .35rem .85rem;
  align-items: baseline;
  padding: 1rem 1.1rem;
}

.page-about .about-role__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-role__summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: var(--radius-md);
}

.page-about .about-role__index {
  grid-row: span 2;
  font-size: .8rem;
  font-weight: 700;
  color: var(--red);
  border: 1px solid var(--red);
  border-radius: 50%;
  width: 1.7rem;
  height: 1.7rem;
  display: grid;
  place-items: center;
  align-self: center;
}

.page-about .about-role__name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--ink);
}

.page-about .about-role__tagline {
  font-size: .84rem;
  color: #6b5a4e;
}

.page-about .about-role__body {
  padding: 0 1.1rem 1.15rem 3.65rem;
}

.page-about .about-role__body p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.85;
  color: #40332c;
}

.page-about .about-review {
  margin-top: clamp(2rem, 5vw, 3rem);
  background: var(--mist);
  border-radius: var(--radius-lg);
  padding: clamp(1.2rem, 3.5vw, 2rem);
  position: relative;
}

.page-about .about-review::before {
  content: "";
  position: absolute;
  top: -14px;
  left: clamp(1rem, 4vw, 2.5rem);
  width: 64px;
  height: 5px;
  background: var(--coral);
  border-radius: 3px;
}

.page-about .about-review__title {
  margin: 0 0 1.1rem;
  font-size: 1.08rem;
  color: var(--ink);
}

.page-about .about-review__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-review__item {
  display: grid;
  grid-template-columns: 5.6rem 1fr;
  gap: .6rem;
  align-items: start;
  padding-bottom: .95rem;
  border-bottom: 1px dashed rgba(36, 26, 21, .18);
}

.page-about .about-review__item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .about-review__no {
  font-size: .74rem;
  color: var(--red);
  letter-spacing: .08em;
  padding-top: .2rem;
}

.page-about .about-review__item p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: #40332c;
}

.page-about .about-review__note {
  margin: 1.3rem 0 0;
  font-size: .88rem;
  line-height: 1.85;
  color: #40332c;
}

.page-about .about-review__note a {
  color: var(--red);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-review__note a:hover,
.page-about .about-review__note a:focus-visible {
  color: var(--navy);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline-band {
  background:
    linear-gradient(180deg, var(--cream) 0%, #efe0cd 100%);
  color: var(--ink);
  padding-block: clamp(2.4rem, 7vw, 4.5rem) clamp(3rem, 8vw, 5.5rem);
}

.page-about .about-timeline-band .section-head__title {
  color: var(--ink);
}

.page-about .about-timeline-band .section-head__note {
  color: #5a4b42;
}

.page-about .about-timeline-band .section-head__eyebrow {
  color: var(--red);
  letter-spacing: .14em;
  font-size: .76rem;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: 1.4rem;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--coral), var(--red) 60%, rgba(201, 71, 44, .15));
  transform-origin: top;
  transform: skewX(-7deg);
}

.page-about .about-tl {
  position: relative;
  padding-left: 2rem;
  transition: transform .22s var(--ease);
}

.page-about .about-tl__dot {
  position: absolute;
  left: 0;
  top: .55rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--cream);
  border: 2px solid var(--red);
}

.page-about .about-tl__body {
  background: #fffaf3;
  border-radius: var(--radius-md);
  padding: 1rem 1.1rem;
  border-left: 3px solid rgba(201, 71, 44, .35);
  transition: border-color .22s var(--ease), box-shadow .22s var(--ease);
}

.page-about .about-tl:hover .about-tl__body,
.page-about .about-tl:focus-within .about-tl__body {
  border-left-color: var(--coral);
  box-shadow: 0 16px 34px -26px rgba(36, 26, 21, .7);
}

.page-about .about-tl__when {
  margin: 0 0 .35rem;
  font-size: .76rem;
  letter-spacing: .1em;
  color: var(--red);
}

.page-about .about-tl__title {
  margin: 0 0 .5rem;
  font-size: 1.05rem;
  color: var(--ink);
  font-family: var(--font-head);
}

.page-about .about-tl__body p {
  margin: 0 0 .55rem;
  font-size: .9rem;
  line-height: 1.8;
  color: #40332c;
}

.page-about .about-tl__detail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  margin: 0 !important;
  font-size: .84rem !important;
  color: #6b5a4e !important;
  padding-top: .6rem;
  border-top: 1px dashed rgba(36, 26, 21, .16);
}

/* ---------- 覆盖与协作 ---------- */
.page-about .about-reach {
  background:
    radial-gradient(90% 80% at 10% 0%, rgba(13, 53, 82, .9) 0%, rgba(6, 24, 38, 0) 70%),
    var(--night);
  color: var(--cream);
  padding-block: clamp(2.6rem, 7vw, 5rem) clamp(3rem, 8vw, 5.5rem);
}

.page-about .about-reach__grid {
  align-items: start;
  gap: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .about-reach__panel {
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-lg);
  background: rgba(13, 53, 82, .5);
  overflow: hidden;
}

.page-about .about-reach__panel .panel__head {
  padding: .85rem 1.1rem;
  border-bottom: 1px solid var(--about-hair);
  color: var(--cyan);
  font-size: .78rem;
  letter-spacing: .12em;
}

.page-about .about-reach__panel .panel__body {
  padding: 1.1rem;
}

.page-about .about-reach__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .85rem;
}

.page-about .about-reach__list li {
  display: flex;
  align-items: baseline;
  gap: .65rem;
  font-size: .89rem;
  line-height: 1.65;
  color: var(--about-dim);
  padding-bottom: .7rem;
  border-bottom: 1px solid var(--line-cream);
}

.page-about .about-reach__list li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .about-reach__num {
  color: var(--cyan);
  font-weight: 700;
  font-size: 1.05rem;
  flex: none;
}

.page-about .about-reach__media {
  margin: 0 0 1.3rem;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-reach__media .media-frame__img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.page-about .about-reach__text p {
  margin: 0 0 1rem;
  font-size: clamp(.93rem, 2.4vw, 1rem);
  line-height: 1.9;
  color: var(--about-dim);
}

.page-about .about-reach__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .8rem;
  margin-top: 1.5rem;
}

.page-about .about-btn-ghost {
  border: 1px solid var(--about-hair);
  color: var(--cream);
}

.page-about .about-btn-ghost:hover,
.page-about .about-btn-ghost:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
  }

  .page-about .about-method__figure {
    grid-template-columns: minmax(0, 460px) minmax(0, 1fr);
    align-items: end;
    gap: 1.4rem;
  }

  .page-about .about-review__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.2rem;
  }

  .page-about .about-review__item {
    grid-template-columns: 1fr;
    gap: .4rem;
    border-bottom: none;
    border-left: 2px solid rgba(36, 26, 21, .16);
    padding: 0 0 0 .85rem;
  }

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

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .about-hero__facts {
    gap: 2.4rem;
  }

  .page-about .about-method__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-reach__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  }

  .page-about .about-timeline {
    gap: 1.1rem;
  }

  .page-about .about-timeline::before {
    left: 50%;
    transform: translateX(-50%) skewX(0);
    transform-origin: center;
  }

  .page-about .about-tl {
    padding-left: 0;
    width: 46%;
  }

  .page-about .about-tl:nth-child(odd) {
    justify-self: start;
    text-align: right;
  }

  .page-about .about-tl:nth-child(even) {
    justify-self: end;
    padding-top: 3.2rem;
  }

  .page-about .about-tl:nth-child(odd) .about-tl__body {
    border-left: none;
    border-right: 3px solid rgba(201, 71, 44, .35);
  }

  .page-about .about-tl:nth-child(odd) .about-tl__detail {
    justify-content: flex-end;
  }

  .page-about .about-tl:nth-child(odd) .about-tl__dot {
    left: auto;
    right: -3.35rem;
  }

  .page-about .about-tl:nth-child(even) .about-tl__dot {
    left: -3.35rem;
  }

  .page-about .about-tl:hover .about-tl__body {
    transform: translateY(-3px);
  }

  .page-about .about-tl__body {
    transition: transform .22s var(--ease), border-color .22s var(--ease), box-shadow .22s var(--ease);
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__title {
    max-width: 18ch;
  }

  .page-about .about-review {
    padding: 2.2rem 2.4rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-tl,
  .page-about .about-tl__body,
  .page-about .about-map__node rect,
  .page-about .about-hero__media {
    transition: none;
    transform: none;
  }
}
<<<PAGE_CSS_END>>>