.page-about {
  --about-rule: rgba(91, 63, 209, .3);
  --about-gap: clamp(28px, 5vw, 56px);
  color: var(--cream);
}

.page-about .breadcrumb {
  margin: clamp(16px, 3vw, 28px) 0 clamp(14px, 3vw, 22px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--haze);
}

.page-about .breadcrumb a {
  color: var(--haze);
  text-decoration: none;
}

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

/* 首屏 */
.page-about .about-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 44px);
  padding-bottom: var(--about-gap);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-hero__text > * + * {
  margin-top: clamp(14px, 2.4vw, 22px);
}

.page-about .about-hero h1 {
  font-size: clamp(34px, 6.4vw, 64px);
  font-weight: 900;
  font-stretch: 88%;
  line-height: .98;
  letter-spacing: -.02em;
  margin: 0;
  max-width: 14ch;
}

.page-about .about-hero .lede {
  max-width: 36ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--haze);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 4px;
}

.page-about .about-hero__panel {
  position: relative;
  padding: clamp(18px, 3vw, 28px);
  border: 1px solid rgba(122, 91, 255, .34);
  border-radius: var(--r-lg);
  background: linear-gradient(158deg, var(--lamp-hi), var(--lamp) 42%, var(--night) 100%);
  overflow: hidden;
}

.page-about .about-hero__panel-tag {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mint);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 16px;
  margin: 0;
}

.page-about .about-stat dt {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--haze);
}

.page-about .about-stat dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 700;
  color: var(--cream);
  white-space: nowrap;
}

.page-about .about-stat dd .num {
  color: var(--orange);
  font-size: 1.32em;
  margin-right: 2px;
}

.page-about .about-hero__spark {
  display: block;
  width: 100%;
  height: auto;
  margin-top: 22px;
  opacity: .85;
}

.page-about .about-hero__spark path {
  stroke: var(--purple-hi);
}

/* 双栏：索引 + 长文 */
.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 4vw, 44px);
  padding-top: var(--about-gap);
}

.page-about .about-toc__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--haze);
  text-transform: uppercase;
}

.page-about .about-toc .toc {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: thin;
}

.page-about .toc-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  flex: 0 0 auto;
  padding: 7px 12px;
  border: 1px solid var(--about-rule);
  border-radius: 999px;
  font-size: 13px;
  color: var(--haze);
  text-decoration: none;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease), background-color var(--t) var(--ease);
}

.page-about .toc-link__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--mint);
}

.page-about .toc-link:hover,
.page-about .toc-link:focus-visible {
  color: var(--cream);
  border-color: var(--purple-hi);
}

.page-about .toc-link[aria-current="true"] {
  color: var(--cream);
  background: rgba(255, 107, 44, .12);
  border-color: var(--orange);
}

.page-about .toc-link[aria-current="true"] .toc-link__num {
  color: var(--orange);
}

/* 章节 */
.page-about .about-sec {
  padding-bottom: var(--about-gap);
  scroll-margin-top: 96px;
}

.page-about .about-sec + .about-sec {
  padding-top: clamp(8px, 2vw, 18px);
  border-top: 1px solid var(--about-rule);
}

.page-about .about-sec .eyebrow {
  margin-bottom: 10px;
}

.page-about .about-sec .section-title {
  font-size: clamp(24px, 3.6vw, 38px);
  font-weight: 900;
  font-stretch: 88%;
  line-height: 1.12;
  letter-spacing: -.015em;
  margin: 0 0 clamp(14px, 2.4vw, 22px);
}

.page-about .prose p {
  max-width: 36em;
  line-height: 1.85;
  color: var(--haze);
  margin: 0 0 1.05em;
}

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

.page-about .about-sec__next {
  margin-top: 1.2em;
}

.page-about .link-more {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 107, 44, .4);
  padding-bottom: 2px;
  transition: border-color var(--t) var(--ease), color var(--t) var(--ease);
}

.page-about .link-more::after {
  content: " →";
  font-family: var(--font-mono);
}

.page-about .link-more:hover,
.page-about .link-more:focus-visible {
  color: var(--cream);
  border-color: var(--cream);
}

/* 图片 */
.page-about .about-figure {
  margin: 0 0 clamp(18px, 3vw, 26px);
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--about-rule);
  background: var(--lamp);
}

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

.page-about .about-figure .media-frame__tag {
  display: block;
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--haze);
  background: var(--lamp);
  border-top: 1px solid var(--about-rule);
}

/* 四步流程 */
.page-about .about-flow {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .flow-step {
  position: relative;
  padding: 18px 18px 20px;
  border: 1px solid var(--about-rule);
  border-radius: var(--r-md);
  background: var(--lamp);
  transition: border-color var(--t) var(--ease), background-color var(--t) var(--ease);
}

.page-about .flow-step__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--orange);
  border: 1px solid rgba(255, 107, 44, .45);
  border-radius: 999px;
  padding: 2px 10px;
  margin-bottom: 10px;
}

.page-about .flow-step__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 900;
  font-stretch: 88%;
  letter-spacing: -.01em;
  color: var(--cream);
}

.page-about .flow-step__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--haze);
}

.page-about .flow-step:hover {
  border-color: var(--orange);
  background: var(--lamp-hi);
}

/* 时间线 */
.page-about .about-tl {
  list-style: none;
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0 0 0 26px;
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--purple), rgba(91, 63, 209, .18));
  border-radius: 2px;
}

.page-about .tl-item {
  position: relative;
  padding: 14px 16px 16px;
  border: 1px solid transparent;
  border-radius: var(--r-md);
  transition: border-color var(--t) var(--ease), background-color var(--t) var(--ease);
}

.page-about .tl-item__dot {
  position: absolute;
  left: -26px;
  top: 22px;
  width: 10px;
  height: 10px;
  background: var(--night);
  border: 2px solid var(--purple-hi);
  transform: rotate(45deg);
}

.page-about .tl-item__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--mint);
}

.page-about .tl-item__title {
  margin: 6px 0 4px;
  font-size: 18px;
  font-weight: 900;
  font-stretch: 88%;
  letter-spacing: -.01em;
  color: var(--cream);
}

.page-about .tl-item__kw {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--orange-soft);
}

.page-about .tl-item__note {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--haze);
}

.page-about .tl-item:hover,
.page-about .tl-item:focus-within {
  border-color: rgba(122, 91, 255, .5);
  background: rgba(42, 30, 74, .62);
}

.page-about .tl-item:hover .tl-item__dot,
.page-about .tl-item:focus-within .tl-item__dot {
  background: var(--orange);
  border-color: var(--orange);
}

/* 团队 */
.page-about .team-grid {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .team-card {
  padding: 18px;
  border: 1px solid var(--about-rule);
  border-radius: var(--r-md);
  background: linear-gradient(170deg, var(--lamp-hi), var(--lamp));
  transition: border-color var(--t) var(--ease);
}

.page-about .team-card__count {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.4vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .team-card__title {
  margin: 10px 0 6px;
  font-size: 16px;
  font-weight: 900;
  font-stretch: 88%;
  color: var(--cream);
}

.page-about .team-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--haze);
}

.page-about .team-card:hover {
  border-color: var(--orange);
}

/* 两条主线 */
.page-about .channel-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: clamp(16px, 3vw, 24px);
}

.page-about .channel-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--about-rule);
  border-radius: var(--r-lg);
  background: var(--lamp);
  transition: border-color var(--t) var(--ease), background-color var(--t) var(--ease);
}

.page-about .channel-card--alt {
  background: rgba(91, 63, 209, .16);
}

.page-about .channel-card__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--mint);
}

.page-about .channel-card__title {
  margin: 0;
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 900;
  font-stretch: 88%;
  letter-spacing: -.015em;
  color: var(--cream);
}

.page-about .channel-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--haze);
}

.page-about .channel-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 2px 0 6px;
  padding: 0;
}

.page-about .channel-card .btn {
  align-self: flex-start;
}

.page-about .channel-card:hover {
  border-color: var(--purple-hi);
}

/* 联系与地域 */
.page-about .place-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 3vw, 28px);
  align-items: start;
}

.page-about .place-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  border-top: 1px solid var(--about-rule);
  padding-top: 16px;
}

.page-about .place-list li {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--cream);
}

.page-about .place-list__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--mint);
}

.page-about .place-list a {
  color: var(--cream);
  text-decoration: none;
  border-bottom: 1px solid var(--about-rule);
  padding-bottom: 1px;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
}

.page-about .place-list a:hover,
.page-about .place-list a:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

.page-about .place-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .about-figure--place {
  margin-bottom: 0;
}

/* 屏幕适配 */
@media (min-width: 640px) {
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .team-grid .team-card:nth-child(even) {
    margin-top: 22px;
  }

  .page-about .place-list li {
    grid-template-columns: 96px minmax(0, 1fr);
    align-items: baseline;
    gap: 12px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

  .page-about .about-layout {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-toc {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-toc .toc {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
    padding-bottom: 0;
    border-left: 1px solid var(--about-rule);
  }

  .page-about .toc-link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    padding: 9px 12px;
    margin-left: -1px;
  }

  .page-about .toc-link[aria-current="true"] {
    background: none;
    border-left-color: var(--orange);
    color: var(--orange);
  }

  .page-about .toc-link[aria-current="true"] .toc-link__num {
    color: var(--orange);
  }

  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 26px;
  }

  .page-about .flow-step::after {
    content: "";
    position: absolute;
    right: -17px;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-left: 10px solid var(--lamp);
    border-top: 9px solid transparent;
    border-bottom: 9px solid transparent;
    transition: border-left-color var(--t) var(--ease);
  }

  .page-about .flow-step:hover::after {
    border-left-color: var(--orange);
  }

  .page-about .flow-step:last-child::after {
    display: none;
  }

  .page-about .about-tl {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    padding: 34px 0 0;
  }

  .page-about .about-tl::before {
    left: 6px;
    right: 6px;
    top: 8px;
    bottom: auto;
    width: auto;
    height: 2px;
    background: linear-gradient(90deg, var(--purple), rgba(91, 63, 209, .2));
  }

  .page-about .tl-item {
    padding: 14px 14px 16px 0;
    border: 1px solid transparent;
    border-radius: var(--r-sm);
  }

  .page-about .tl-item__dot {
    left: 0;
    top: -31px;
  }

  .page-about .tl-item {
    padding-left: 14px;
  }

  .page-about .tl-item__dot {
    left: 14px;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .team-grid .team-card:nth-child(even) {
    margin-top: 26px;
  }

  .page-about .channel-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .channel-card--alt {
    margin-top: 28px;
  }

  .page-about .place-grid {
    grid-template-columns: 1fr 1fr;
    gap: clamp(24px, 4vw, 44px);
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero h1 {
    max-width: 13ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .toc-link,
  .page-about .link-more,
  .page-about .flow-step,
  .page-about .tl-item,
  .page-about .team-card,
  .page-about .channel-card,
  .page-about .place-list a,
  .page-about .flow-step::after {
    transition: none;
  }
}
<<<END>>>