.page-about {
  --about-cut: 26px;
  --about-cut-sm: 14px;
  background: var(--c-mist);
  color: var(--c-ink);
  font-family: var(--font-body);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(24px, 5vw, 56px) 0 clamp(34px, 6vw, 76px);
  background:
    radial-gradient(115% 85% at 88% -10%, rgba(47, 127, 120, .22), transparent 62%),
    radial-gradient(90% 70% at 6% 110%, rgba(232, 162, 58, .12), transparent 65%),
    linear-gradient(180deg, var(--c-mist) 0%, #ebf2ef 100%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  margin-top: clamp(18px, 3vw, 34px);
}

.page-about .about-kicker {
  margin: 0;
  font-size: .75rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--c-celadon-deep);
}

.page-about .about-hero__copy h1 {
  margin: .28em 0 .42em;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(2.4rem, 7.2vw, 4.5rem);
  line-height: 1.05;
  letter-spacing: -.025em;
  color: var(--c-deep);
}

.page-about .about-hero__copy .lede {
  margin: 0 0 20px;
  max-width: 34em;
  font-size: clamp(1rem, 1.9vw, 1.1rem);
  line-height: 1.82;
  color: rgba(16, 42, 46, .82);
}

.page-about .about-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-hero__figure {
  margin: 0;
  padding: 12px 12px 14px;
  background: linear-gradient(155deg, var(--c-deep-soft), var(--c-deep));
  clip-path: polygon(0 0, calc(100% - 38px) 0, 100% 38px, 100% 100%, 0 100%);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 2px;
}

.page-about .about-hero__figure figcaption {
  margin-top: 10px;
  font-size: .72rem;
  letter-spacing: .12em;
  color: var(--c-amber);
}

/* ---------- 章节头 ---------- */
.page-about .about-head {
  max-width: 60ch;
  margin-bottom: clamp(20px, 3.4vw, 36px);
}

.page-about .about-head h2 {
  margin: .22em 0 .5em;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.6rem, 3.6vw, 2.5rem);
  line-height: 1.16;
  letter-spacing: -.018em;
  color: var(--c-deep);
}

.page-about .about-head__text {
  margin: 0;
  line-height: 1.82;
  color: rgba(16, 42, 46, .78);
}

/* ---------- 演进日志 ---------- */
.page-about .about-evolution {
  position: relative;
}

.page-about .about-log {
  display: grid;
  gap: 12px;
}

.page-about .about-log__item {
  background: #ffffff;
  border: 1px solid var(--c-line);
  border-left: 4px solid var(--c-celadon);
  border-radius: 0 var(--about-cut) 0 0;
  transition: border-color .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .about-log__item[open] {
  border-left-color: var(--c-amber);
  box-shadow: var(--shadow-panel);
}

.page-about .about-log__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-log__summary:focus-visible {
  outline: 2px solid var(--c-amber);
  outline-offset: -2px;
}

.page-about .about-log__year {
  font-size: .9rem;
  letter-spacing: .06em;
  color: var(--c-celadon-deep);
}

.page-about .about-log__item[open] .about-log__year {
  color: var(--c-amber-deep);
}

.page-about .about-log__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1rem, 2.2vw, 1.15rem);
  color: var(--c-deep);
}

.page-about .about-log__chev {
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--c-celadon);
  border-bottom: 2px solid var(--c-celadon);
  transform: rotate(45deg);
  transition: transform .26s var(--ease), border-color .26s var(--ease);
}

.page-about .about-log__item[open] .about-log__chev {
  transform: rotate(-135deg);
  border-color: var(--c-amber);
}

.page-about .about-log__panel {
  padding: 0 18px 20px;
}

.page-about .about-log__panel p {
  margin: 0;
  max-width: 46ch;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(16, 42, 46, .8);
}

/* ---------- 做法 ---------- */
.page-about .about-rules {
  display: grid;
  gap: 12px;
}

.page-about .about-rule {
  background: rgba(255, 255, 255, .92);
  border: 1px solid var(--c-line);
  border-radius: 3px var(--about-cut) 3px var(--about-cut);
  overflow: hidden;
  transition: box-shadow .3s var(--ease);
}

.page-about .about-rule[open] {
  box-shadow: var(--shadow-panel);
  border-color: rgba(47, 127, 120, .42);
}

.page-about .about-rule summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-rule summary:focus-visible {
  outline: 2px solid var(--c-celadon);
  outline-offset: -2px;
}

.page-about .about-rule__num {
  flex: none;
  font-size: .82rem;
  letter-spacing: .08em;
  color: var(--c-celadon-deep);
  background: rgba(47, 127, 120, .12);
  padding: 3px 8px;
  border-radius: 2px;
}

.page-about .about-rule[open] .about-rule__num {
  background: rgba(232, 162, 58, .2);
  color: var(--c-amber-deep);
}

.page-about .about-rule__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.02rem;
  line-height: 1.45;
  color: var(--c-deep);
}

.page-about .about-rule p {
  margin: 0;
  padding: 0 18px 18px;
  max-width: 46ch;
  line-height: 1.82;
  color: rgba(16, 42, 46, .78);
}

/* ---------- 团队 ---------- */
.page-about .about-team__layout {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
}

.page-about .about-team__stats {
  display: grid;
  gap: 12px;
}

.page-about .about-stat {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-rows: auto auto;
  gap: 2px 16px;
  align-items: baseline;
  padding: 16px 18px;
  background: #ffffff;
  border: 1px solid var(--c-line);
  border-radius: 3px var(--about-cut-sm) 3px var(--about-cut-sm);
}

.page-about .about-stat__num {
  grid-row: 1 / span 2;
  font-size: 1.9rem;
  font-weight: 700;
  line-height: 1;
  color: var(--c-deep);
}

.page-about .about-stat__label {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
  color: var(--c-celadon-deep);
}

.page-about .about-stat__desc {
  font-size: .88rem;
  line-height: 1.66;
  color: rgba(16, 42, 46, .72);
}

.page-about .about-team__figure {
  margin: 0;
  padding: 10px;
  background: var(--c-sand);
  border-radius: var(--about-cut) 0 var(--about-cut) 0;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 2px;
}

.page-about .about-team__figure figcaption {
  margin-top: 9px;
  padding-left: 4px;
  font-size: .72rem;
  letter-spacing: .08em;
  color: rgba(16, 42, 46, .62);
}

/* ---------- 观察员 ---------- */
.page-about .about-observer {
  margin-top: clamp(20px, 3.4vw, 34px);
  background: linear-gradient(135deg, var(--c-indigo) 0%, #332a55 100%);
  color: var(--c-mist);
  border-radius: 0 var(--about-cut) 0 var(--about-cut);
  overflow: hidden;
}

.page-about .about-observer summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  padding: 20px 22px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-observer summary:focus-visible {
  outline: 2px solid var(--c-amber);
  outline-offset: -3px;
}

.page-about .about-observer__tag {
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--c-ink);
  background: var(--c-amber);
  padding: 4px 9px;
  border-radius: 2px;
}

.page-about .about-observer__title {
  flex: 1 1 220px;
  min-width: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1rem, 2.4vw, 1.16rem);
  line-height: 1.4;
}

.page-about .about-observer__chev {
  flex: none;
  width: 9px;
  height: 9px;
  border-right: 2px solid rgba(247, 250, 248, .8);
  border-bottom: 2px solid rgba(247, 250, 248, .8);
  transform: rotate(45deg);
  transition: transform .26s var(--ease);
}

.page-about .about-observer[open] .about-observer__chev {
  transform: rotate(-135deg);
  border-color: var(--c-amber);
}

.page-about .about-observer__body {
  padding: 0 22px 22px;
}

.page-about .about-observer__body p {
  margin: 0 0 10px;
  max-width: 48ch;
  font-size: .95rem;
  line-height: 1.82;
  color: rgba(247, 250, 248, .84);
}

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

/* ---------- 生态 ---------- */
.page-about .about-eco {
  position: relative;
  background:
    radial-gradient(85% 70% at 14% 8%, rgba(47, 127, 120, .34), transparent 66%),
    linear-gradient(168deg, var(--c-deep) 0%, var(--c-ink) 100%);
  color: var(--c-mist);
}

.page-about .about-eco .about-kicker {
  color: var(--c-amber);
}

.page-about .about-eco .about-head h2 {
  color: var(--c-mist);
}

.page-about .about-eco .about-head__text {
  color: rgba(247, 250, 248, .76);
}

.page-about .about-eco__grid {
  display: grid;
  gap: 12px;
}

.page-about .about-eco__figure {
  margin: 0;
  padding: 10px;
  background: rgba(247, 250, 248, .08);
  border: 1px solid var(--c-line-dark);
  border-radius: var(--about-cut) 0 var(--about-cut) 0;
}

.page-about .about-eco__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 2px;
}

.page-about .about-eco__figure figcaption {
  margin-top: 9px;
  padding-left: 3px;
  font-size: .72rem;
  letter-spacing: .1em;
  color: rgba(247, 250, 248, .6);
}

.page-about .about-eco__node {
  padding: 16px 18px;
  background: rgba(247, 250, 248, .06);
  border: 1px solid var(--c-line-dark);
  border-left: 3px solid var(--c-celadon);
  border-radius: 2px;
  transition: background .26s var(--ease), border-color .26s var(--ease), transform .26s var(--ease);
}

.page-about .about-eco__node:hover,
.page-about .about-eco__node:focus-within {
  background: rgba(232, 162, 58, .12);
  border-color: var(--c-amber);
  border-left-color: var(--c-amber);
  transform: translateX(4px);
}

.page-about .about-eco__count {
  margin: 0 0 6px;
  font-size: .78rem;
  letter-spacing: .12em;
  color: var(--c-amber);
}

.page-about .about-eco__node h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.06rem;
  color: var(--c-mist);
}

.page-about .about-eco__node p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.78;
  color: rgba(247, 250, 248, .74);
}

/* ---------- 体验衡量 ---------- */
.page-about .about-metrics__panel {
  padding: clamp(6px, 1.6vw, 18px) clamp(16px, 3vw, 30px);
}

.page-about .about-metrics__list {
  margin: 0;
  display: grid;
}

.page-about .about-metrics__list > div {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 4px 14px;
  padding: 14px 0;
  border-bottom: 1px dashed var(--c-line);
}

.page-about .about-metrics__list > div:last-child {
  border-bottom: 0;
}

.page-about .about-metrics__list dt {
  font-size: .92rem;
  color: rgba(16, 42, 46, .72);
}

.page-about .about-metrics__list dd {
  margin: 0;
  font-size: .95rem;
  color: var(--c-deep);
  font-weight: 600;
}

.page-about .about-metrics__num {
  font-size: 1.24rem;
  font-weight: 700;
  color: var(--c-celadon-deep);
}

/* ---------- 下一步 ---------- */
.page-about .about-next__inner {
  padding: clamp(22px, 4vw, 44px);
  background:
    linear-gradient(130deg, var(--c-sand) 0%, #efe6d6 100%);
  border-radius: var(--about-cut) 0 var(--about-cut) 0;
}

.page-about .about-next__inner h2 {
  margin: .2em 0 .4em;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.4vw, 2.2rem);
  letter-spacing: -.016em;
  color: var(--c-deep);
}

.page-about .about-next__inner > p {
  margin: 0 0 20px;
  max-width: 48ch;
  line-height: 1.8;
  color: rgba(16, 42, 46, .8);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-metrics__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(20px, 3vw, 40px);
  }

  .page-about .about-metrics__list > div:nth-last-child(2) {
    border-bottom: 0;
  }
}

@media (min-width: 760px) {
  .page-about .about-rules {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: start;
  }

  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    grid-template-areas:
      "figure travel"
      "figure tech"
      "figure content";
    align-items: stretch;
  }

  .page-about .about-eco__figure {
    grid-area: figure;
  }

  .page-about .about-eco__node--travel {
    grid-area: travel;
  }

  .page-about .about-eco__node--tech {
    grid-area: tech;
  }

  .page-about .about-eco__node--content {
    grid-area: content;
  }

  .page-about .about-eco__figure img {
    height: 100%;
    object-fit: cover;
  }
}

@media (max-width: 759px) {
  .page-about .about-team__stats {
    grid-template-columns: minmax(0, 1fr);
  }
}
<<<END>>>