.page-about {
  --about-rail: rgba(43, 240, 208, 0.32);
  --about-glass: rgba(23, 38, 60, 0.66);
  --about-hair: rgba(201, 216, 230, 0.13);
  --about-shade: rgba(6, 9, 15, 0.55);
  padding-inline: var(--gutter);
  padding-bottom: clamp(64px, 9vw, 128px);
  font-family: var(--font-body);
  color: var(--body-text);
  overflow-x: clip;
}

.page-about > * {
  max-width: var(--shell);
  margin-inline: auto;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  display: grid;
  gap: 22px;
  padding-block: clamp(28px, 5vw, 64px) clamp(36px, 5vw, 76px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(30px, 6vw, 64px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--white);
  margin: 0;
  max-width: 17ch;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 66ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
}

.page-about .about-hero__lead a,
.page-about .about-timeline__card a,
.page-about .about-faq a,
.page-about .about-partners__note a,
.page-about .about-section__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-soft);
  transition: border-color var(--shift);
}

.page-about .about-hero__lead a:hover,
.page-about .about-timeline__card a:hover,
.page-about .about-faq a:hover,
.page-about .about-partners__note a:hover,
.page-about .about-section__note a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .about-hero__anchor {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  padding-top: 8px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-hero__anchor .anchor-number {
  font-family: var(--font-mono);
  font-size: clamp(72px, 17vw, 168px);
  line-height: 0.8;
  letter-spacing: -0.05em;
  color: var(--cyan);
  text-shadow: 0 0 42px rgba(43, 240, 208, 0.22);
}

.page-about .about-hero__anchor .annotation {
  flex: 1 1 180px;
  max-width: 26ch;
  line-height: 1.6;
}

/* ---------- 导读索引 ---------- */

.page-about .about-index {
  border-top: 1px solid var(--about-hair);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 4px;
  border-bottom: 1px solid var(--about-hair);
  text-decoration: none;
  color: var(--body-text);
  transition: color var(--shift), padding-left var(--shift);
}

.page-about .about-index__list > li:last-child .about-index__link {
  border-bottom: 0;
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-index__label {
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
  letter-spacing: 0.02em;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--cyan);
  padding-left: 10px;
}

.page-about .about-index__link:hover .about-index__label,
.page-about .about-index__link:hover .about-index__num {
  color: var(--cyan);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-section {
  padding-block: clamp(48px, 7vw, 108px);
  border-top: 1px solid var(--about-hair);
}

.page-about .about-section__title {
  font-family: var(--font-display);
  font-size: clamp(23px, 3.6vw, 42px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--white);
  margin: 12px 0 0;
  max-width: 22ch;
}

.page-about .about-section__lead {
  margin: 18px 0 0;
  max-width: 70ch;
  line-height: 1.85;
}

.page-about .about-section__note {
  margin-top: clamp(24px, 3vw, 40px);
  padding-left: 16px;
  border-left: 2px solid var(--about-rail);
  max-width: 62ch;
  line-height: 1.7;
}

/* ---------- 三类使用者 ---------- */

.page-about .about-roles {
  display: grid;
  gap: 16px;
  margin-top: clamp(28px, 4vw, 48px);
}

.page-about .about-roles__item {
  background: var(--panel);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  padding: 22px 22px 24px;
  transition: transform var(--shift), border-color var(--shift), background var(--shift);
}

.page-about .about-roles__tag {
  display: inline-block;
  margin: 0 0 12px;
  padding: 3px 10px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
  border: 1px solid var(--cyan-soft);
  border-radius: 999px;
}

.page-about .about-roles__item h3 {
  margin: 0 0 10px;
  font-size: 18px;
  color: var(--white);
  line-height: 1.4;
}

.page-about .about-roles__item p {
  margin: 0;
  line-height: 1.8;
  font-size: 15px;
}

.page-about .about-roles__item:hover {
  transform: translateY(-4px);
  border-color: var(--cyan-soft);
  background: var(--glass);
}

/* ---------- 时间轴 ---------- */

.page-about .about-strip {
  margin: clamp(26px, 4vw, 44px) 0 0;
}

.page-about .about-strip__img {
  display: block;
  width: 100%;
  height: clamp(170px, 24vw, 260px);
  object-fit: cover;
  object-position: center 32%;
  border-radius: var(--radius);
  opacity: 0.7;
  border: 1px solid var(--about-hair);
}

.page-about .about-strip figcaption {
  margin-top: 12px;
}

.page-about .about-scale {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 26px 0 34px;
}

.page-about .about-scale a {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  padding: 6px 12px;
  color: var(--muted);
  border: 1px solid var(--about-hair);
  border-radius: 999px;
  text-decoration: none;
  transition: color var(--shift), border-color var(--shift), background var(--shift);
}

.page-about .about-scale a:hover,
.page-about .about-scale a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan-soft);
  background: var(--teal-veil);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 5px;
  width: 1px;
  background: linear-gradient(
    180deg,
    transparent,
    var(--about-rail) 8%,
    var(--about-rail) 92%,
    transparent
  );
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 34px;
  padding-block: 14px;
}

.page-about .about-timeline__item:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
  border-radius: var(--radius);
}

.page-about .about-timeline__node {
  position: absolute;
  left: 0;
  top: 40px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  background: var(--ink);
  box-shadow: 0 0 0 4px rgba(43, 240, 208, 0.09);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
  margin-bottom: 10px;
}

.page-about .about-timeline__card {
  background: var(--about-glass);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  padding: 20px 22px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: transform var(--shift), border-color var(--shift), box-shadow var(--shift);
}

.page-about .about-timeline__kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .about-timeline__card h3 {
  margin: 0 0 10px;
  font-size: 18px;
  line-height: 1.45;
  color: var(--white);
}

.page-about .about-timeline__card p {
  margin: 0;
  line-height: 1.8;
  font-size: 15px;
}

.page-about .about-timeline__item:hover .about-timeline__card,
.page-about .about-timeline__item:focus-visible .about-timeline__card {
  transform: translateY(-4px);
  border-color: var(--cyan-soft);
  box-shadow: 0 14px 36px var(--about-shade);
}

/* ---------- 数据产出 ---------- */

.page-about .about-pipeline {
  display: grid;
  gap: 30px;
  margin-top: 6px;
}

.page-about .about-steps {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding-top: 20px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-steps__num {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .about-steps__item h3 {
  margin: 0 0 8px;
  font-size: 17px;
  color: var(--white);
}

.page-about .about-steps__item p {
  margin: 0;
  line-height: 1.8;
  font-size: 15px;
}

.page-about .about-pipeline__figure {
  margin: 0;
  border: 1px solid var(--about-hair);
}

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

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  gap: 18px;
  margin-top: clamp(28px, 4vw, 48px);
}

.page-about .about-team__item {
  padding: 24px 22px;
  background: var(--panel);
  border-left: 2px solid var(--about-rail);
  border-radius: 0 var(--radius) var(--radius) 0;
  transition: background var(--shift), border-color var(--shift);
}

.page-about .about-team__item:hover {
  background: var(--glass);
  border-left-color: var(--cyan);
}

.page-about .about-team__figure {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: clamp(38px, 6vw, 58px);
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--white);
}

.page-about .about-team__item h3 {
  margin: 0 0 10px;
  font-size: 16px;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .about-team__item p {
  margin: 0;
  line-height: 1.8;
  font-size: 15px;
}

/* ---------- 排名顺序 ---------- */

.page-about .about-priority {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
}

.page-about .about-priority__item {
  background: var(--ink);
  padding: 22px;
}

.page-about .about-priority__rank {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--muted);
  margin-bottom: 10px;
}

.page-about .about-priority__item strong {
  display: block;
  font-size: 19px;
  color: var(--white);
  margin-bottom: 8px;
  letter-spacing: 0.01em;
}

.page-about .about-priority__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
}

.page-about .about-priority__item:first-child strong {
  color: var(--cyan);
}

.page-about .about-faq {
  margin-top: clamp(24px, 3vw, 38px);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  background: var(--about-glass);
}

.page-about .about-faq summary {
  cursor: pointer;
  padding: 18px 22px;
  font-size: 16px;
  font-weight: 600;
  color: var(--white);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 12px;
}

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

.page-about .about-faq summary::before {
  content: "＋";
  font-family: var(--font-mono);
  color: var(--cyan);
  font-size: 15px;
}

.page-about .about-faq[open] summary::before {
  content: "－";
}

.page-about .about-faq summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .about-faq p {
  margin: 0;
  padding: 0 22px 20px;
  line-height: 1.8;
  font-size: 15px;
  max-width: 74ch;
}

/* ---------- 合作生态 ---------- */

.page-about .about-partners {
  display: grid;
  gap: 30px;
  margin-top: clamp(28px, 4vw, 46px);
}

.page-about .about-partners__stats {
  display: grid;
  gap: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
}

.page-about .about-partners__stat {
  background: var(--panel);
  padding: 20px 22px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
}

.page-about .about-partners__num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 6vw, 52px);
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--white);
}

.page-about .about-partners__num.is-cyan {
  color: var(--cyan);
  text-shadow: 0 0 30px rgba(43, 240, 208, 0.2);
}

.page-about .about-partners__stat .annotation {
  flex: 1 1 160px;
  line-height: 1.6;
}

.page-about .about-partners__figure {
  margin: 0;
  border: 1px solid var(--about-hair);
}

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

.page-about .about-partners__note {
  margin: clamp(24px, 3vw, 36px) 0 0;
  max-width: 72ch;
  line-height: 1.85;
}

/* ---------- 联系 ---------- */

.page-about .about-contact {
  display: grid;
  gap: 1px;
  margin-top: clamp(28px, 4vw, 44px);
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
}

.page-about .about-contact__item {
  background: var(--ink);
  padding: 22px;
}

.page-about .about-contact__label {
  margin: 0 0 10px;
  letter-spacing: 0.14em;
}

.page-about .about-contact__value {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: clamp(15px, 2vw, 19px);
  color: var(--white);
  letter-spacing: 0.01em;
  word-break: break-word;
}

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

.page-about .about-section#service .about-section__note a {
  color: var(--cyan);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-index__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-index__list > li:nth-child(odd) .about-index__link {
    padding-right: 18px;
    border-right: 1px solid var(--about-hair);
  }

  .page-about .about-index__list > li:nth-last-child(-n + 2) .about-index__link {
    border-bottom: 0;
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

  .page-about .about-pipeline {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-pipeline__figure {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .about-partners {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: 48px;
    align-items: start;
  }

  /* 时间轴：中央主轴，条目左右交替 */
  .page-about .about-timeline::before {
    left: 50%;
  }

  .page-about .about-timeline__item {
    width: 50%;
    padding-left: 0;
    padding-right: 0;
    padding-block: 22px;
  }

  .page-about .about-timeline__item--left {
    margin-right: 50%;
    padding-right: 56px;
  }

  .page-about .about-timeline__item--right {
    margin-left: 50%;
    padding-left: 56px;
  }

  .page-about .about-timeline__item--left .about-timeline__node {
    left: auto;
    right: -6px;
    top: 34px;
  }

  .page-about .about-timeline__item--right .about-timeline__node {
    left: -6px;
    right: auto;
    top: 34px;
  }

  .page-about .about-timeline__year {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    position: absolute;
    top: 28px;
    margin: 0;
  }

  .page-about .about-timeline__item--left .about-timeline__year {
    right: 12px;
  }

  .page-about .about-timeline__item--right .about-timeline__year {
    left: 12px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.62fr) minmax(210px, 0.62fr);
    column-gap: 72px;
    row-gap: 20px;
    align-items: start;
  }

  .page-about .about-hero > .eyebrow,
  .page-about .about-hero__title,
  .page-about .about-hero__lead {
    grid-column: 1;
  }

  .page-about .about-hero__anchor {
    grid-column: 2;
    grid-row: 1 / -1;
    align-self: end;
    flex-direction: column;
    align-items: flex-start;
    border-top: 0;
    border-left: 1px solid var(--about-hair);
    padding-top: 0;
    padding-left: 26px;
  }

  .page-about .about-hero__anchor .annotation {
    flex: 0 0 auto;
    max-width: 24ch;
  }

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

  .page-about .about-index__list > li:nth-child(odd) .about-index__link {
    padding-right: 0;
    border-right: 0;
  }

  .page-about .about-index__list > li:not(:last-child) .about-index__link {
    border-right: 1px solid var(--about-hair);
    padding-right: 16px;
  }

  .page-about .about-index__list > li:nth-last-child(-n + 2) .about-index__link {
    border-bottom: 0;
  }

  .page-about .about-partners__stat {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding: 24px 26px;
  }

  .page-about .about-partners__stat .annotation {
    flex: 0 0 auto;
    max-width: 24ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-roles__item,
  .page-about .about-timeline__card,
  .page-about .about-index__link,
  .page-about .about-team__item {
    transition: none;
  }

  .page-about .about-roles__item:hover,
  .page-about .about-timeline__item:hover .about-timeline__card,
  .page-about .about-timeline__item:focus-visible .about-timeline__card {
    transform: none;
  }
}
<<<END>>>