.page-about {
  --about-line: rgba(195, 205, 214, 0.14);
  --about-amber-line: rgba(242, 178, 51, 0.55);
  display: block;
  color: var(--mist);
  font-family: var(--font-sans);
  line-height: 1.75;
  background:
    radial-gradient(900px 480px at 82% -6%, rgba(47, 163, 107, 0.12), transparent 68%),
    var(--ink-900);
  -webkit-font-smoothing: antialiased;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  color: var(--white-cool);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding-top: 22px;
  font-size: 13px;
  color: var(--mist);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  display: grid;
  gap: 30px;
  padding-top: 26px;
  padding-bottom: 52px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--green), rgba(47, 163, 107, 0));
  opacity: 0.7;
}

.page-about .about-hero__title {
  font-size: clamp(36px, 9vw, 76px);
  letter-spacing: -0.035em;
  line-height: 1.05;
  margin-top: 16px;
  max-width: 13ch;
  font-stretch: condensed;
}

.page-about .about-hero__lede {
  margin-top: 20px;
  font-size: 17px;
  line-height: 1.7;
  color: var(--white-cool);
  max-width: 34em;
}

.page-about .about-hero__sub {
  margin: 12px 0 0;
  font-size: 15px;
  color: var(--mist);
  max-width: 32em;
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 26px;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .about-hero__facts > div {
  padding-left: 12px;
  border-left: 1px solid var(--about-line);
}

.page-about .about-hero__facts dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .about-hero__facts dd {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.2;
  color: var(--amber);
}

.page-about .about-hero__media {
  margin: 0;
  border: 1px solid var(--about-line);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.82) contrast(1.04);
}

.page-about .about-hero__media figcaption {
  padding: 10px 12px;
  border-top: 1px solid var(--about-line);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-block {
  padding-top: 48px;
  padding-bottom: 48px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-block__head {
  max-width: 720px;
  margin-bottom: 30px;
}

.page-about .about-block__head h2 {
  margin-top: 14px;
  font-size: clamp(24px, 4.2vw, 38px);
}

.page-about .about-block__intro {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
  max-width: 38em;
}

.page-about .about-jump {
  display: inline-block;
  margin-top: 14px;
  font-size: 13px;
  font-family: var(--font-mono);
  color: var(--green-light);
  text-decoration: none;
  border-bottom: 1px solid rgba(143, 227, 190, 0.4);
  padding-bottom: 2px;
}

.page-about .about-jump:hover {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  max-width: 700px;
  border-left: 1px solid var(--about-line);
  padding-left: 18px;
}

.page-about .about-origin p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
}

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

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 26px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(
    180deg,
    rgba(47, 163, 107, 0.05),
    rgba(47, 163, 107, 0.62) 12%,
    rgba(47, 163, 107, 0.62) 88%,
    rgba(47, 163, 107, 0.05)
  );
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 20px;
}

.page-about .tl-item:nth-child(n + 4) {
  padding-bottom: 16px;
}

.page-about .tl-item:nth-child(n + 6) {
  padding-bottom: 12px;
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 13px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(47, 163, 107, 0.12);
}

.page-about .tl-item--now::before {
  background: var(--green-light);
  box-shadow: 0 0 0 4px rgba(143, 227, 190, 0.18);
  animation: aboutPulse 2.6s var(--ease) infinite;
}

@keyframes aboutPulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(143, 227, 190, 0.18); }
  50% { box-shadow: 0 0 0 9px rgba(143, 227, 190, 0.02); }
}

.page-about .tl-card {
  background: var(--ink-800);
  border: 1px solid var(--about-line);
  border-radius: 2px;
  padding: 15px 16px;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .tl-card:hover,
.page-about .tl-item:target .tl-card {
  border-color: var(--about-amber-line);
}

.page-about .tl-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.page-about .tl-season {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--green-light);
}

.page-about .tl-ver {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1;
  padding: 4px 7px;
  border: 1px solid rgba(47, 163, 107, 0.45);
  border-radius: 2px;
  color: var(--green-light);
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .tl-ver:hover {
  border-color: var(--amber);
  color: var(--amber);
}

.page-about .tl-card h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.page-about .tl-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .tl-figure {
  margin: 14px 0 0;
}

.page-about .tl-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--about-line);
  border-radius: 2px;
  filter: saturate(0.8) contrast(1.03);
  transition: transform var(--dur) var(--ease), filter var(--dur) var(--ease);
}

.page-about .tl-figure:hover img {
  transform: scale(1.02);
  filter: saturate(0.95) contrast(1.03);
}

.page-about .tl-figure figcaption {
  margin-top: 8px;
}

/* ---------- 覆盖规模 ---------- */
.page-about .about-scale {
  background: var(--ink-800);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

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

.page-about .about-scale__media {
  margin: 0;
  border: 1px solid var(--about-line);
  background: var(--ink-700);
  overflow: hidden;
}

.page-about .about-scale__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.78) contrast(1.05);
}

.page-about .meters {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 4px;
}

.page-about .meter {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: baseline;
  gap: 8px 12px;
  padding: 10px 0 12px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .meter__label {
  font-size: 14px;
  color: var(--mist);
  min-width: 0;
}

.page-about .meter__value {
  font-family: var(--font-mono);
  font-size: 21px;
  font-weight: 600;
  line-height: 1;
  color: var(--amber);
  white-space: nowrap;
}

.page-about .meter__value small {
  font-size: 11px;
  font-weight: 400;
  color: var(--mist);
  margin-left: 3px;
}

.page-about .meter__track {
  grid-column: 1 / -1;
  display: block;
  height: 5px;
  border-radius: 999px;
  background: var(--ink-700);
  overflow: hidden;
}

.page-about .meter__fill {
  display: block;
  height: 100%;
  width: 30%;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(47, 163, 107, 0.55), var(--green) 68%, var(--green-light));
  transition: width 600ms var(--ease);
}

.page-about .meter:nth-child(1) .meter__fill { width: 58%; }
.page-about .meter:nth-child(2) .meter__fill { width: 76%; }
.page-about .meter:nth-child(3) .meter__fill { width: 43%; }
.page-about .meter:nth-child(4) .meter__fill { width: 96%; }
.page-about .meter:nth-child(5) .meter__fill { width: 88%; }
.page-about .meter:nth-child(6) .meter__fill { width: 41%; }

.page-about .meter__tip {
  position: absolute;
  left: 0;
  bottom: calc(100% - 2px);
  z-index: 3;
  max-width: 230px;
  padding: 8px 10px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--white-cool);
  background: var(--ink-700);
  border: 1px solid var(--about-amber-line);
  border-radius: 2px;
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur);
}

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

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 16px;
}

.page-about .about-team__card {
  background: var(--ink-800);
  border: 1px solid var(--about-line);
  border-radius: 2px;
  padding: 20px 18px;
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-team__card:hover {
  border-color: var(--about-amber-line);
}

.page-about .about-team__count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 600;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-team__card h3 {
  margin: 10px 0 8px;
  font-size: 18px;
}

.page-about .about-team__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-team__flow {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-team__flow li {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 12px;
  padding: 16px 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-team__flow li:last-child {
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-team__step {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--green-light);
  line-height: 1.9;
}

.page-about .about-team__flow h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.page-about .about-team__flow p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 40em;
}

/* ---------- 合作 ---------- */
.page-about .about-partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-partners__list li {
  display: grid;
  grid-template-columns: 76px 1fr;
  gap: 14px;
  align-items: start;
  padding: 18px 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-partners__list li:last-child {
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-partners__num {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 600;
  line-height: 1.15;
  color: var(--amber);
  white-space: nowrap;
}

.page-about .about-partners__num small {
  display: block;
  font-size: 11px;
  font-weight: 400;
  color: var(--mist);
  margin-top: 2px;
}

.page-about .about-partners__num--text {
  font-size: 16px;
  color: var(--green-light);
  padding-top: 4px;
}

.page-about .about-partners__list h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.page-about .about-partners__list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 42em;
}

/* ---------- 收束 ---------- */
.page-about .about-next {
  padding-bottom: 64px;
}

.page-about .about-next h2 {
  margin-top: 14px;
  font-size: clamp(22px, 3.6vw, 30px);
  max-width: 22ch;
}

.page-about .about-next__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 20px;
  margin-top: 24px;
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding-bottom: 64px;
  }

  .page-about .about-hero__lede {
    font-size: 18px;
  }

  .page-about .about-block {
    padding-top: 64px;
    padding-bottom: 64px;
  }

  .page-about .tl-card {
    padding: 20px 22px;
  }

  .page-about .tl-card h3 {
    font-size: 19px;
  }

  .page-about .tl-card p {
    font-size: 15.5px;
  }

  .page-about .about-scale__grid {
    grid-template-columns: 5fr 7fr;
    align-items: start;
    gap: 32px;
  }

  .page-about .about-team__grid {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  .page-about .about-team__flow li {
    grid-template-columns: 48px 1fr;
  }

  .page-about .about-partners__list li {
    grid-template-columns: 96px 1fr;
    gap: 20px;
    padding: 22px 0;
  }

  .page-about .about-partners__num {
    font-size: 30px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .crumbs {
    padding-top: 30px;
  }

  .page-about .about-hero {
    grid-template-columns: 7fr 5fr;
    align-items: start;
    gap: 48px;
    padding-top: 34px;
    padding-bottom: 80px;
  }

  .page-about .about-hero__media {
    margin-top: 8px;
  }

  .page-about .about-block {
    padding-top: 80px;
    padding-bottom: 80px;
  }

  .page-about .about-block__head {
    margin-bottom: 38px;
  }

  .page-about .timeline {
    padding-left: 34px;
  }

  .page-about .timeline::before {
    left: 9px;
  }

  .page-about .tl-item::before {
    left: -29px;
    top: 16px;
    width: 9px;
    height: 9px;
  }

  .page-about .tl-item {
    padding-bottom: 26px;
  }

  .page-about .tl-item:nth-child(n + 4) {
    padding-bottom: 20px;
  }

  .page-about .tl-item:nth-child(n + 6) {
    padding-bottom: 14px;
  }

  .page-about .tl-card {
    padding: 24px 26px;
  }

  .page-about .tl-figure {
    max-width: 520px;
  }

  .page-about .about-scale__grid {
    grid-template-columns: 5fr 7fr;
    gap: 44px;
  }

  .page-about .meter {
    padding: 12px 0 14px;
  }

  .page-about .meter__value {
    font-size: 24px;
  }

  .page-about .about-team__card {
    padding: 26px 24px;
  }

  .page-about .about-team__flow {
    margin-top: 30px;
  }

  .page-about .about-next {
    padding-bottom: 88px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .meter__fill,
  .page-about .tl-figure img,
  .page-about .tl-card {
    transition: none;
  }

  .page-about .tl-item--now::before {
    animation: none;
  }

  .page-about .tl-figure:hover img {
    transform: none;
  }
}
<<<END>>>