.page-about {
  --about-pad: clamp(48px, 7vw, 104px);
  --about-hair: rgba(47, 91, 122, .3);
  --about-hair-soft: rgba(47, 91, 122, .18);
  --about-ink-soft: rgba(21, 36, 48, .74);
  display: block;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .about-crumb {
  background: var(--blue-900);
  border-bottom: 1px solid var(--line-soft);
  padding-block: 14px;
}

.page-about .about-crumb .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .06em;
  color: var(--text-mute);
}

.page-about .about-crumb .breadcrumb__list > li {
  display: flex;
  align-items: center;
}

.page-about .about-crumb .breadcrumb__list > li + li::before {
  content: "/";
  margin-inline: 10px;
  color: var(--line-300);
}

.page-about .about-crumb a {
  color: var(--cyan-500);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--paper-000);
}

/* ---------- 开场 ---------- */
.page-about .about-open {
  position: relative;
  overflow: hidden;
  background: linear-gradient(158deg, var(--blue-900) 0%, var(--blue-700) 56%, var(--blue-500) 100%);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-open::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(47, 91, 122, .26) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(47, 91, 122, .2) 1px, transparent 1px);
  background-size: 96px 96px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .9), transparent 78%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .9), transparent 78%);
}

.page-about .about-open__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  padding-block: clamp(40px, 6vw, 88px) clamp(44px, 6.4vw, 96px);
}

.page-about .about-open__title {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.4rem, 7.4vw, 5.5rem);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--mist-050);
}

.page-about .about-open__title-line {
  display: block;
}

.page-about .about-open__title-line:nth-child(2) {
  color: var(--cyan-500);
}

.page-about .about-open__sign {
  margin: 24px 0 0;
  padding-left: 14px;
  border-left: 1px solid var(--cyan-700);
  font-size: var(--fs-12);
  letter-spacing: .16em;
  color: var(--text-mute);
}

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

.page-about .about-open__lede {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(1rem, 1.4vw, 1.1875rem);
  line-height: 1.82;
  color: var(--text-soft);
}

/* ---------- 数据索引 ---------- */
.page-about .about-index {
  margin: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-index__row {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 18px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-index__key {
  margin: 0;
  font-size: var(--fs-14);
  letter-spacing: .04em;
  color: var(--text-mute);
}

.page-about .about-index__val {
  position: relative;
  margin: 0;
  font-size: var(--fs-16);
  letter-spacing: .02em;
  text-align: right;
  color: var(--cyan-500);
}

.page-about .about-index__tip {
  position: absolute;
  left: auto;
  right: 0;
  bottom: calc(100% + 8px);
  z-index: 6;
  width: max-content;
  max-width: min(300px, 74vw);
  padding: 10px 12px;
  background: var(--blue-900);
  border: 1px solid var(--cyan-700);
  color: var(--mist-050);
  font-family: var(--font-body);
  font-size: var(--fs-12);
  line-height: 1.65;
  letter-spacing: 0;
  text-align: left;
  opacity: 0;
  visibility: hidden;
  transform: translateY(5px);
  pointer-events: none;
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur) var(--ease);
}

.page-about .about-index__row:hover .about-index__tip,
.page-about .about-index__row:focus-within .about-index__tip {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ---------- 版本线 ---------- */
.page-about .about-versions {
  background: var(--blue-900);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-versions__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  padding-block: var(--about-pad);
}

.page-about .about-versions__title {
  margin: 14px 0 26px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.9rem, 4.2vw, 3.1rem);
  line-height: 1.06;
  letter-spacing: -.025em;
  color: var(--mist-050);
}

.page-about .version-axis {
  position: relative;
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 2px 0 2px 2px;
  list-style: none;
}

.page-about .version-axis::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(to bottom, var(--cyan-500), var(--cyan-700) 46%, var(--line-300) 78%, transparent);
}

.page-about .version-axis__link {
  position: relative;
  display: grid;
  grid-template-columns: 22px auto;
  grid-template-areas:
    "dot code"
    "dot name";
  align-items: center;
  gap: 0 10px;
  padding: 9px 10px 9px 0;
  text-decoration: none;
}

.page-about .version-axis__dot {
  grid-area: dot;
  justify-self: start;
  width: 9px;
  height: 9px;
  margin-left: 1px;
  border: 1px solid var(--cyan-700);
  border-radius: 50%;
  background: var(--blue-900);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .version-axis__code {
  grid-area: code;
  font-size: var(--fs-12);
  letter-spacing: .16em;
  color: var(--cyan-500);
}

.page-about .version-axis__name {
  grid-area: name;
  font-size: var(--fs-14);
  color: var(--text-mute);
  transition: color var(--dur) var(--ease);
}

.page-about .version-axis__link:hover .version-axis__dot,
.page-about .version-axis__link:focus-visible .version-axis__dot {
  border-color: var(--cyan-500);
  background: var(--cyan-500);
  box-shadow: 0 0 0 3px rgba(18, 214, 200, .18);
}

.page-about .version-axis__link:hover .version-axis__name,
.page-about .version-axis__link:focus-visible .version-axis__name {
  color: var(--paper-000);
}

.page-about .about-versions__hint {
  margin: 16px 0 0;
  font-size: var(--fs-12);
  letter-spacing: .08em;
  color: var(--text-mute);
}

.page-about .about-versions__flow {
  display: grid;
  border-top: 1px solid var(--line-soft);
}

.page-about .stage {
  display: grid;
  gap: 8px;
  padding: clamp(22px, 3vw, 34px) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .stage__code {
  margin: 0;
  font-size: var(--fs-12);
  letter-spacing: .22em;
  color: var(--cyan-500);
}

.page-about .stage__title {
  margin: 0;
  font-size: clamp(1.125rem, 1.8vw, 1.5rem);
  font-weight: 600;
  letter-spacing: -.012em;
  color: var(--mist-050);
}

.page-about .stage__text {
  margin: 0;
  max-width: 64ch;
  font-size: var(--fs-16);
  line-height: 1.78;
  color: var(--text-soft);
}

.page-about .stage-figure {
  margin: clamp(28px, 4vw, 44px) 0 0;
}

.page-about .media__frame > img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 长期投入 ---------- */
.page-about .about-pillars {
  background: var(--mist-050);
  color: var(--ink-800);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-pillars__inner {
  padding-block: var(--about-pad);
}

.page-about .about-pillars__head {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(26px, 4vw, 46px);
  padding-bottom: 20px;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-pillars__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.75rem, 3.6vw, 2.75rem);
  line-height: 1.08;
  letter-spacing: -.022em;
  color: var(--ink-800);
}

.page-about .about-pillars__note {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.76;
  color: var(--about-ink-soft);
}

.page-about .pillar-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
}

.page-about .pillar {
  display: grid;
  align-content: start;
  gap: 10px;
  padding: clamp(22px, 3vw, 34px);
  background: var(--paper-000);
  transition: background var(--dur) var(--ease);
}

.page-about .pillar:hover {
  background: #ffffff;
}

.page-about .pillar__index {
  margin: 0;
  font-size: var(--fs-12);
  letter-spacing: .18em;
  color: var(--cyan-700);
}

.page-about .pillar__title {
  margin: 0;
  font-size: clamp(1.0625rem, 1.5vw, 1.3125rem);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ink-800);
}

.page-about .pillar__text {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--about-ink-soft);
}

/* ---------- 改版 ---------- */
.page-about .about-revamp {
  background: var(--paper-000);
  color: var(--ink-800);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-revamp__inner {
  display: grid;
  gap: 30px;
  padding-block: var(--about-pad);
}

.page-about .about-revamp__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.75rem, 3.4vw, 2.625rem);
  line-height: 1.1;
  letter-spacing: -.022em;
  color: var(--ink-800);
}

.page-about .about-revamp__text {
  margin: 0;
  max-width: 52ch;
  font-size: var(--fs-16);
  line-height: 1.82;
  color: var(--about-ink-soft);
}

.page-about .revamp-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-hair);
}

.page-about .revamp-step {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 6px 20px;
  padding: 20px 8px;
  border-bottom: 1px solid var(--about-hair-soft);
  transition: background var(--dur) var(--ease);
}

.page-about .revamp-step:hover {
  background: rgba(18, 214, 200, .07);
}

.page-about .revamp-step__num {
  grid-row: 1 / span 2;
  font-size: var(--fs-20);
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--cyan-700);
}

.page-about .revamp-step__title {
  margin: 0;
  font-size: var(--fs-16);
  font-weight: 700;
  color: var(--ink-800);
}

.page-about .revamp-step__text {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.78;
  color: var(--about-ink-soft);
}

/* ---------- 上海团队 ---------- */
.page-about .about-team {
  background: linear-gradient(180deg, var(--blue-700) 0%, var(--blue-900) 100%);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-team__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  padding-block: var(--about-pad);
}

.page-about .about-team__title {
  margin: 14px 0 18px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.75rem, 3.6vw, 2.75rem);
  line-height: 1.08;
  letter-spacing: -.024em;
  color: var(--mist-050);
}

.page-about .about-team__text {
  margin: 0;
  max-width: 56ch;
  font-size: var(--fs-16);
  line-height: 1.82;
  color: var(--text-soft);
}

.page-about .about-team__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: 28px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .team-stat {
  display: grid;
  gap: 8px;
  padding: 18px 14px;
  background: rgba(4, 24, 43, .66);
}

.page-about .team-stat__num {
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--cyan-500);
}

.page-about .team-stat__label {
  font-size: var(--fs-12);
  letter-spacing: .08em;
  color: var(--text-mute);
}

.page-about .team-details {
  margin-top: 24px;
  border: 1px solid var(--line-soft);
  background: rgba(4, 24, 43, .54);
}

.page-about .team-details > summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 15px 16px;
  list-style: none;
  cursor: pointer;
  font-size: var(--fs-14);
  letter-spacing: .04em;
  color: var(--cyan-500);
  transition: background var(--dur) var(--ease);
}

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

.page-about .team-details > summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: var(--fs-16);
  line-height: 1;
  color: var(--cyan-500);
}

.page-about .team-details[open] > summary::before {
  content: "−";
}

.page-about .team-details > summary:hover,
.page-about .team-details > summary:focus-visible {
  background: rgba(18, 214, 200, .08);
}

.page-about .team-details__body {
  display: grid;
  gap: 14px;
  padding: 16px;
  border-top: 1px solid var(--line-soft);
}

.page-about .team-dept {
  display: grid;
  gap: 5px;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
}

.page-about .team-dept:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .team-dept__name {
  margin: 0;
  font-size: var(--fs-14);
  letter-spacing: .06em;
  color: var(--cyan-500);
}

.page-about .team-dept__desc {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.78;
  color: var(--text-soft);
}

.page-about .about-team__media {
  margin: 0;
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  background: var(--mist-050);
  color: var(--ink-800);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-partners__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  padding-block: var(--about-pad);
}

.page-about .about-partners__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.75rem, 3.4vw, 2.625rem);
  line-height: 1.1;
  letter-spacing: -.022em;
  color: var(--ink-800);
}

.page-about .about-partners__lead {
  margin: 0 0 26px;
  max-width: 58ch;
  font-size: var(--fs-16);
  line-height: 1.82;
  color: var(--about-ink-soft);
}

.page-about .partner-points {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-hair);
}

.page-about .partner-point {
  display: grid;
  gap: 4px;
  padding: 15px 0;
  border-bottom: 1px solid var(--about-hair-soft);
}

.page-about .partner-point__key {
  font-size: var(--fs-12);
  letter-spacing: .16em;
  color: var(--cyan-700);
}

.page-about .partner-point__val {
  font-size: var(--fs-14);
  line-height: 1.76;
  color: var(--about-ink-soft);
}

.page-about .about-partners__media {
  margin: 0;
}

/* ---------- 场景与规模 ---------- */
.page-about .about-scale {
  background: var(--blue-900);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-scale__inner {
  padding-block: var(--about-pad);
}

.page-about .about-scale__head {
  display: grid;
  gap: 12px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-scale__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.75rem, 3.6vw, 2.75rem);
  line-height: 1.08;
  letter-spacing: -.024em;
  color: var(--mist-050);
}

.page-about .about-scale__note {
  margin: 0;
  max-width: 56ch;
  font-size: var(--fs-16);
  line-height: 1.76;
  color: var(--text-soft);
}

.page-about .scale-list {
  display: grid;
  gap: 1px;
  margin: clamp(24px, 4vw, 42px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .scale-list__item {
  display: grid;
  gap: 8px;
  padding: clamp(18px, 2.6vw, 28px);
  background: rgba(4, 24, 43, .9);
  transition: background var(--dur) var(--ease);
}

.page-about .scale-list__item:hover {
  background: rgba(18, 214, 200, .08);
}

.page-about .scale-list__who {
  margin: 0;
  font-size: var(--fs-14);
  letter-spacing: .06em;
  color: var(--cyan-500);
}

.page-about .scale-list__what {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.78;
  color: var(--text-soft);
}

/* ---------- 收尾入口 ---------- */
.page-about .about-cta {
  background: linear-gradient(120deg, var(--blue-700) 0%, var(--blue-900) 100%);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 26px;
  padding-block: clamp(44px, 6vw, 82px);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.5rem, 2.8vw, 2.25rem);
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--mist-050);
}

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

.page-about .about-cta__item {
  display: grid;
  gap: 4px;
  padding: 16px 18px;
  background: rgba(4, 24, 43, .76);
  transition: background var(--dur) var(--ease);
}

.page-about .about-cta__item:hover,
.page-about .about-cta__item:focus-within {
  background: rgba(18, 214, 200, .1);
}

.page-about .about-cta__link {
  font-size: var(--fs-16);
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--cyan-500);
  text-decoration: none;
}

.page-about .about-cta__link:hover,
.page-about .about-cta__link:focus-visible {
  text-decoration: underline;
}

.page-about .about-cta__desc {
  font-size: var(--fs-14);
  line-height: 1.72;
  color: var(--text-soft);
}

.page-about .about-cta__foot {
  margin: 0;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-cta__item {
    grid-template-columns: minmax(0, 190px) minmax(0, 1fr);
    gap: 4px 24px;
    align-items: baseline;
  }
}

@media (min-width: 720px) {
  .page-about .stage {
    grid-template-columns: 78px minmax(0, 1fr);
    gap: 6px 26px;
    align-items: start;
  }

  .page-about .stage__code {
    grid-column: 1;
    grid-row: 1;
    padding-top: 6px;
  }

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

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

  .page-about .partner-point {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 6px 24px;
    align-items: baseline;
  }
}

@media (min-width: 860px) {
  .page-about .about-pillars__head {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: 10px 48px;
    align-items: end;
  }

  .page-about .pillar-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .pillar--a {
    grid-column: span 5;
  }

  .page-about .pillar--b {
    grid-column: span 7;
  }

  .page-about .pillar--c {
    grid-column: span 12;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.55fr);
    gap: 10px 52px;
    align-items: start;
  }

  .page-about .pillar--c .pillar__index,
  .page-about .pillar--c .pillar__title {
    grid-column: 1;
  }

  .page-about .pillar--c .pillar__text {
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .page-about .scale-list__item {
    grid-template-columns: minmax(0, 208px) minmax(0, 1fr);
    gap: 8px 32px;
    align-items: baseline;
  }
}

@media (min-width: 960px) {
  .page-about .about-open__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: clamp(28px, 4vw, 72px);
    align-items: start;
  }

  .page-about .about-open__lead {
    position: sticky;
    top: calc(var(--masthead-h) + 40px);
  }

  .page-about .about-versions__inner {
    grid-template-columns: 244px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 88px);
    align-items: start;
  }

  .page-about .about-versions__rail {
    position: sticky;
    top: calc(var(--masthead-h) + 40px);
  }

  .page-about .about-revamp__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(30px, 4vw, 76px);
    align-items: start;
  }

  .page-about .about-team__inner {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: clamp(32px, 5vw, 80px);
    align-items: start;
  }

  .page-about .about-partners__inner {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: clamp(30px, 5vw, 76px);
    align-items: center;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: clamp(26px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-cta__foot {
    grid-column: 2;
  }
}

@media (max-width: 719px) {
  .page-about .about-index__row {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-index__val {
    text-align: left;
  }

  .page-about .about-index__tip {
    position: static;
    display: block;
    width: auto;
    max-width: none;
    margin-top: 8px;
    padding: 0 0 0 12px;
    background: none;
    border: 0;
    border-left: 1px solid var(--cyan-700);
    opacity: 1;
    visibility: visible;
    transform: none;
    color: var(--text-mute);
  }
}

@media (max-width: 480px) {
  .page-about .revamp-step {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .page-about .revamp-step__num {
    grid-row: auto;
  }

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

  .page-about .team-stat {
    grid-template-columns: 60px minmax(0, 1fr);
    align-items: baseline;
  }
}
<<<END>>>