.page-about {
  --ab-gap: clamp(56px, 8vw, 104px);
  background: var(--ink);
  color: var(--frost);
  padding-bottom: calc(var(--contact-h) + 16px);
}

.page-about .ab-inner {
  max-width: var(--wrap);
  margin-inline: auto;
}

/* ---------- 面包屑 ---------- */

.page-about .ab-crumb-wrap {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 20px var(--gutter) 0;
}

.page-about .ab-crumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: baseline;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .ab-crumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .ab-crumb a:hover,
.page-about .ab-crumb a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-about .ab-crumb__sep {
  color: var(--line);
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 24px var(--gutter) 0;
  display: grid;
  gap: 26px;
}

.page-about .ab-hero__media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 11;
  object-fit: cover;
  filter: saturate(0.72) brightness(0.7);
}

.page-about .ab-hero__glass {
  position: absolute;
  left: 14px;
  bottom: 14px;
  padding: 10px 14px;
  background: var(--glass);
  border: 1px solid rgba(237, 242, 238, 0.16);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.page-about .ab-hero__glass .label {
  display: block;
  color: var(--lime);
  margin-bottom: 5px;
}

.page-about .ab-hero__glass p {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--frost);
}

.page-about .ab-hero h1 {
  font-family: var(--display);
  font-size: clamp(36px, 8.4vw, 82px);
  font-weight: 800;
  line-height: 0.96;
  letter-spacing: -0.02em;
  margin: 12px 0 0;
  color: var(--frost);
}

.page-about .ab-hero .lede {
  font-family: var(--serif);
  font-size: clamp(17px, 2.1vw, 21px);
  line-height: 1.72;
  color: var(--mist);
  margin: 18px 0 0;
  max-width: 30em;
}

@media (min-width: 860px) {
  .page-about .ab-hero {
    grid-template-columns: 7fr 5fr;
    gap: 40px;
    align-items: end;
    padding-top: 36px;
  }

  .page-about .ab-hero__media img {
    aspect-ratio: 16 / 9;
  }

  .page-about .ab-hero__copy {
    padding-bottom: 6px;
  }
}

/* ---------- 标题统一 ---------- */

.page-about h2 {
  font-family: var(--display);
  font-size: clamp(27px, 4.6vw, 45px);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 10px 0 0;
  color: var(--frost);
}

/* ---------- 起点 ---------- */

.page-about .ab-origin {
  margin-top: var(--ab-gap);
  padding: var(--ab-gap) var(--gutter);
  background: var(--turf);
}

.page-about .ab-origin__grid {
  display: grid;
  gap: 26px;
}

.page-about .ab-origin__body p {
  margin: 0 0 1.1em;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--mist);
  max-width: 36em;
}

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

.page-about .ab-origin__note {
  border-left: 2px solid var(--lime);
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--frost);
}

.page-about .ab-origin__note .mono {
  display: block;
  color: var(--lime);
  font-size: 12px;
  letter-spacing: 0.1em;
  margin: 0 0 8px;
}

.page-about .ab-origin__note p {
  margin: 0;
}

@media (min-width: 900px) {
  .page-about .ab-origin__grid {
    grid-template-columns: repeat(12, 1fr);
    gap: 32px 28px;
  }

  .page-about .ab-origin__lead {
    grid-column: 1 / span 5;
  }

  .page-about .ab-origin__body {
    grid-column: 7 / span 6;
  }

  .page-about .ab-origin__note {
    grid-column: 1 / span 4;
    align-self: start;
  }
}

/* ---------- 时间线 ---------- */

.page-about .ab-timeline {
  padding: var(--ab-gap) var(--gutter);
}

.page-about .ab-timeline__head {
  margin-bottom: 34px;
}

.page-about .ab-track {
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  border-left: 1px solid var(--line);
}

.page-about .ab-track__node {
  --stem: 0;
  position: relative;
  padding: 0 0 30px;
  transition: transform 0.32s var(--ease);
}

.page-about .ab-track__node::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 5px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--line);
  transition: background 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .ab-track__node::after {
  display: none;
}

.page-about .ab-track__node:focus-visible {
  outline: 1px solid var(--lime);
  outline-offset: 4px;
}

.page-about .ab-track__node:hover::before,
.page-about .ab-track__node:focus::before {
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(200, 255, 61, 0.16);
}

.page-about .ab-track__season {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--blue);
}

.page-about .ab-track__node h3 {
  font-family: var(--display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin: 6px 0 0;
  color: var(--frost);
}

.page-about .ab-track__more {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--mist);
  max-height: none;
  opacity: 1;
  overflow: hidden;
}

@media (min-width: 900px) {
  .page-about .ab-track {
    padding: 0;
    border-left: 0;
    border-top: 1px solid var(--line);
    display: grid;
    grid-template-columns: repeat(7, minmax(0, 1fr));
    gap: 0 18px;
  }

  .page-about .ab-track__node {
    --stem: 16px;
    padding: calc(var(--stem) + 16px) 0 0;
  }

  .page-about .ab-track__node:nth-child(2n) {
    --stem: 42px;
  }

  .page-about .ab-track__node:nth-child(3n) {
    --stem: 28px;
  }

  .page-about .ab-track__node:nth-child(4n) {
    --stem: 56px;
  }

  .page-about .ab-track__node::before {
    left: -3px;
    top: -3px;
  }

  .page-about .ab-track__node::after {
    display: block;
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    width: 1px;
    height: var(--stem);
    background: var(--line);
    transition: background 0.25s var(--ease);
  }

  .page-about .ab-track__node:hover::after,
  .page-about .ab-track__node:focus::after {
    background: var(--lime);
  }

  .page-about .ab-track__node:hover,
  .page-about .ab-track__node:focus {
    transform: translateY(-4px);
  }

  .page-about .ab-track__more {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    transition: max-height 0.32s var(--ease), opacity 0.24s var(--ease),
      margin-top 0.32s var(--ease);
  }

  .page-about .ab-track__node:hover .ab-track__more,
  .page-about .ab-track__node:focus .ab-track__more,
  .page-about .ab-track__node:focus-within .ab-track__more {
    max-height: 160px;
    opacity: 1;
    margin-top: 8px;
  }
}

@media (hover: none) {
  .page-about .ab-track__more {
    max-height: none;
    opacity: 1;
  }
}

/* ---------- 团队 ---------- */

.page-about .ab-team {
  padding: var(--ab-gap) var(--gutter);
  background: linear-gradient(180deg, var(--ink) 0%, var(--turf) 100%);
}

.page-about .ab-team__head {
  display: grid;
  gap: 12px;
  margin-bottom: 26px;
}

.page-about .ab-team__intro {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
  max-width: 42em;
}

.page-about .ab-team__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  padding: 16px 18px;
  margin-bottom: 22px;
  border: 1px solid var(--line);
  background: rgba(237, 242, 238, 0.03);
}

.page-about .ab-team__big {
  font-size: clamp(30px, 5vw, 44px);
  line-height: 1;
  color: var(--lime);
}

.page-about .ab-team__bar-text {
  font-size: 14px;
  color: var(--frost);
}

.page-about .ab-team__bar-tail {
  margin-left: auto;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

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

.page-about .ab-team__item {
  background: var(--panel);
  padding: 22px 20px 24px;
  transition: background 0.2s var(--ease);
}

.page-about .ab-team__item:hover {
  background: rgba(200, 255, 61, 0.045);
}

.page-about .ab-team__tick {
  display: block;
  width: 30px;
  height: 3px;
  margin-bottom: 14px;
}

.page-about .ab-team__item--a .ab-team__tick {
  background: var(--lime);
}

.page-about .ab-team__item--b .ab-team__tick {
  background: var(--orange);
}

.page-about .ab-team__item--c .ab-team__tick {
  background: var(--blue);
}

.page-about .ab-team__item--d .ab-team__tick {
  background: var(--mist);
}

.page-about .ab-team__item h3 {
  font-family: var(--display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
  color: var(--frost);
}

.page-about .ab-team__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .ab-team__service {
  margin-top: 22px;
  padding: 16px 18px;
  border-left: 2px solid var(--lime);
  background: rgba(237, 242, 238, 0.03);
}

.page-about .ab-team__service p {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--mist);
}

.page-about .ab-team__service a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 255, 61, 0.4);
  transition: border-color 0.2s var(--ease);
}

.page-about .ab-team__service a:hover,
.page-about .ab-team__service a:focus-visible {
  border-bottom-color: var(--lime);
}

@media (min-width: 720px) {
  .page-about .ab-team__list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1080px) {
  .page-about .ab-team__list {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ---------- 流程 ---------- */

.page-about .ab-flow {
  padding: var(--ab-gap) var(--gutter);
}

.page-about .ab-flow__grid {
  display: grid;
  gap: 32px;
}

.page-about .ab-flow__media {
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .ab-flow__media img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(0.7) brightness(0.75);
}

.page-about .ab-steps {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .ab-steps > li {
  position: relative;
  padding: 0 0 12px 62px;
}

.page-about .ab-steps > li::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 46px;
  bottom: 0;
  width: 1px;
  background: var(--line);
}

.page-about .ab-steps > li:last-child::before {
  display: none;
}

.page-about .ab-steps__num {
  position: absolute;
  left: 0;
  top: 0;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--lime);
  font-size: 12px;
  letter-spacing: 0.06em;
  transition: border-color 0.2s var(--ease);
}

.page-about .ab-steps summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  min-height: 38px;
  padding: 7px 0;
  border-bottom: 1px solid var(--line);
  transition: border-color 0.2s var(--ease);
}

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

.page-about .ab-steps summary::marker {
  content: "";
}

.page-about .ab-steps summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--mono);
  font-size: 16px;
  color: var(--lime);
  line-height: 1;
}

.page-about .ab-steps details[open] summary::after {
  content: "–";
}

.page-about .ab-steps__title {
  font-family: var(--display);
  font-size: 17px;
  font-weight: 700;
  color: var(--frost);
}

.page-about .ab-steps__role {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
  border: 1px solid var(--line);
  padding: 2px 8px;
}

.page-about .ab-steps details[open] summary {
  border-bottom-color: var(--lime);
}

.page-about .ab-steps details[open] .ab-steps__num {
  border-color: var(--lime);
}

.page-about .ab-steps details > p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .ab-steps details > p.ab-steps__out {
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--blue);
}

@media (min-width: 900px) {
  .page-about .ab-flow__grid {
    grid-template-columns: 5fr 7fr;
    gap: 48px;
    align-items: start;
  }
}

/* ---------- 内容准则 ---------- */

.page-about .ab-rules {
  padding: var(--ab-gap) var(--gutter);
  background: var(--turf);
}

.page-about .ab-rules__list {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .ab-rules__list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  align-items: start;
  padding-top: 16px;
  border-top: 1px solid rgba(237, 242, 238, 0.14);
}

.page-about .ab-rules__num {
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--lime);
}

@supports (-webkit-text-stroke: 1px #000) {
  .page-about .ab-rules__num {
    color: transparent;
    -webkit-text-stroke: 1px rgba(200, 255, 61, 0.62);
  }
}

.page-about .ab-rules__list p {
  margin: 0;
  font-size: 16px;
  line-height: 1.82;
  color: var(--frost);
}

@media (min-width: 820px) {
  .page-about .ab-rules__list {
    grid-template-columns: repeat(2, 1fr);
    gap: 30px 48px;
  }
}

/* ---------- 订阅用户构成 ---------- */

.page-about .ab-audience {
  padding: var(--ab-gap) var(--gutter);
  background: linear-gradient(180deg, var(--turf) 0%, var(--ink) 72%);
}

.page-about .ab-audience__body {
  display: grid;
  gap: 28px;
  margin-top: 30px;
}

.page-about .ab-audience__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .ab-audience__stats li {
  background: var(--panel);
  padding: 18px 16px 20px;
  display: grid;
  gap: 7px;
}

.page-about .ab-audience__num {
  font-size: clamp(25px, 3.6vw, 34px);
  line-height: 1;
  color: var(--lime);
}

.page-about .ab-audience__cap {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .ab-audience__text p {
  margin: 0 0 1.05em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

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

.page-about .ab-audience__media {
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .ab-audience__media img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(0.62) brightness(0.72);
}

@media (min-width: 560px) {
  .page-about .ab-audience__stats {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .ab-audience__body {
    grid-template-columns: 7fr 5fr;
    column-gap: 48px;
    row-gap: 32px;
  }

  .page-about .ab-audience__stats {
    grid-column: 1 / -1;
  }

  .page-about .ab-audience__text {
    grid-column: 1;
    grid-row: 2;
  }

  .page-about .ab-audience__media {
    grid-column: 2;
    grid-row: 2;
  }
}

/* ---------- 收尾 ---------- */

.page-about .ab-close {
  padding: var(--ab-gap) var(--gutter) calc(var(--ab-gap) * 0.7);
  border-top: 1px solid var(--line);
}

.page-about .ab-close__lede {
  font-family: var(--serif);
  font-size: clamp(20px, 3vw, 29px);
  line-height: 1.62;
  color: var(--frost);
  max-width: 26em;
  margin: 14px 0 0;
}

.page-about .ab-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}
<<<END>>>