.page-about {
  background: var(--paper-50);
  color: var(--ink-900);
}

.page-about .breadcrumb {
  margin-bottom: 28px;
}

.page-about .breadcrumb__item[aria-current="page"] {
  color: var(--slate);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 24px 0 52px;
  background:
    radial-gradient(circle at 88% 8%, rgba(201, 162, 39, 0.12), transparent 48%),
    var(--paper-50);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  align-items: start;
}

.page-about .about-hero__lead h1 {
  margin: 14px 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.6vw, 56px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--ink-900);
}

.page-about .about-hero__lead .lede {
  margin: 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-700);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px 14px;
  margin: 28px 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(17px, 4.4vw, 26px);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--gold-700);
  word-break: break-word;
}

.page-about .about-fact__label {
  font-size: 12px;
  line-height: 1.55;
  color: var(--slate);
}

.page-about .about-index {
  padding-left: 20px;
  border-left: 1px solid var(--gold-line);
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-about .about-index__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__item + .about-index__item {
  border-top: 1px solid var(--line);
}

.page-about .about-index__link {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 10px;
  align-items: baseline;
  padding: 11px 0;
  font-size: 15px;
  color: var(--ink-700);
  text-decoration: none;
  transition: color 160ms var(--ease-out);
}

.page-about .about-index__no {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gold-700);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--gold-700);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding: clamp(44px, 7vw, 84px) 0;
}

.page-about .about-sec__head {
  max-width: 46em;
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-sec__title {
  margin: 14px 0 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 4.6vw, 36px);
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--ink-700);
}

.page-about .about-sec__lede {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-500);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  overflow: hidden;
  background: var(--paper-50);
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.15;
  pointer-events: none;
}

.page-about .about-timeline__inner {
  position: relative;
  z-index: 1;
}

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

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 28px;
  width: 1px;
  background: var(--line-strong);
}

.page-about .tl__item {
  position: relative;
  padding-left: 34px;
}

.page-about .tl__item + .tl__item {
  margin-top: 20px;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper-50);
  border: 1.5px solid var(--gold-700);
  box-sizing: border-box;
}

.page-about .tl__item--done::before {
  background: var(--gold-500);
  border-color: var(--gold-500);
}

.page-about .tl__item--now::before {
  background: var(--ink-900);
  border-color: var(--gold-500);
  box-shadow: 0 0 0 5px rgba(201, 162, 39, 0.16);
}

.page-about .tl__node {
  border-bottom: 1px solid var(--line);
}

.page-about .tl__summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 4px 12px;
  align-items: baseline;
  padding: 2px 0 14px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl__summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--gold-700);
}

.page-about .tl__node[open] > .tl__summary::after {
  content: "−";
}

.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--gold-700);
  letter-spacing: 0.02em;
}

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

.page-about .tl__title {
  grid-column: 1 / -1;
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--ink-700);
}

.page-about .tl__body {
  padding: 0 0 18px;
}

.page-about .tl__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-500);
}

/* ---------- 职能组 ---------- */
.page-about .about-teams {
  background: var(--paper-100);
}

.page-about .teams__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

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

.page-about .teams__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team {
  padding: 16px 0;
  border-top: 1px solid var(--line-strong);
}

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

.page-about .team__name {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--ink-900);
}

.page-about .team__hex {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
  background: var(--gold-700);
  clip-path: polygon(25% 4%, 75% 4%, 100% 50%, 75% 96%, 25% 96%, 0% 50%);
  transition: transform 220ms var(--ease-out), background 220ms var(--ease-out);
}

.page-about .team:hover .team__hex,
.page-about .team:focus-within .team__hex {
  background: var(--gold-500);
  transform: rotate(30deg) scale(1.12);
}

.page-about .team__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-500);
}

/* ---------- 评价 ---------- */
.page-about .about-reviews {
  background: var(--paper-50);
}

.page-about .reviews__figure {
  margin: 0 0 26px;
}

.page-about .rv__grid {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  padding-bottom: 8px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .rv__col {
  flex: 0 0 82%;
  scroll-snap-align: start;
  padding: 20px 18px 22px;
}

.page-about .rv__col--a {
  background: var(--paper-100);
}

.page-about .rv__col--b {
  background: var(--paper-50);
  border: 1px solid var(--line-strong);
}

.page-about .rv__col--c {
  background: rgba(235, 217, 160, 0.38);
}

.page-about .rv__figure {
  margin: 0 0 12px;
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(30px, 7vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold-700);
}

.page-about .rv__figure--text {
  font-size: clamp(17px, 3.6vw, 21px);
  letter-spacing: 0;
  line-height: 1.4;
  padding-top: 10px;
}

.page-about .rv__unit {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-500);
}

.page-about .rv__label {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--ink-900);
}

.page-about .rv__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-500);
}

.page-about .reviews__note {
  margin: 24px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--gold-line);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--slate);
}

/* ---------- 季度数据 ---------- */
.page-about .about-metrics {
  background-image:
    radial-gradient(circle at 82% 18%, rgba(201, 162, 39, 0.18), transparent 46%),
    repeating-linear-gradient(0deg, rgba(251, 248, 241, 0.04) 0 1px, transparent 1px 34px);
  color: var(--paper-50);
}

.page-about .about-metrics .about-sec__title {
  color: var(--paper-50);
}

.page-about .about-metrics .about-sec__lede {
  color: rgba(251, 248, 241, 0.76);
}

.page-about .metrics__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-light);
}

.page-about .metric {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px 16px;
  align-items: baseline;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-light);
}

.page-about .metric__label {
  font-size: 14px;
  line-height: 1.5;
  color: rgba(251, 248, 241, 0.78);
}

.page-about .metric__rule {
  display: none;
  height: 1px;
  background: var(--line-light);
  align-self: center;
}

.page-about .metric__value {
  display: flex;
  align-items: baseline;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: clamp(24px, 6vw, 34px);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--gold-500);
}

.page-about .metric__unit {
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: rgba(251, 248, 241, 0.7);
}

.page-about .metrics__foot {
  margin: 26px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(251, 248, 241, 0.72);
}

.page-about .metrics__link {
  color: var(--gold-200);
  text-decoration: none;
  border-bottom: 1px solid var(--gold-line);
  padding-bottom: 1px;
}

.page-about .metrics__link:hover,
.page-about .metrics__link:focus-visible {
  color: var(--gold-500);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  background: var(--paper-100);
}

.page-about .eco__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .eco__card {
  padding: 22px 20px;
  background: var(--paper-50);
  border-top: 2px solid var(--gold-500);
}

.page-about .eco__num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: clamp(28px, 6vw, 38px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold-700);
}

.page-about .eco__name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--ink-900);
}

.page-about .eco__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-500);
}

.page-about .eco__card--ink {
  background: var(--ink-900);
  border-top-color: var(--gold-200);
}

.page-about .eco__card--ink .eco__num {
  color: var(--gold-500);
}

.page-about .eco__card--ink .eco__name {
  color: var(--paper-50);
}

.page-about .eco__card--ink .eco__text {
  color: rgba(251, 248, 241, 0.78);
}

/* ---------- 准则与收尾 ---------- */
.page-about .about-rules {
  background: var(--paper-50);
}

.page-about .rules__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .rules__item {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 4px 14px;
  align-content: start;
  padding-top: 16px;
  border-top: 1px solid var(--line-strong);
}

.page-about .rules__no {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.2;
  color: var(--gold-500);
}

.page-about .rules__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--ink-900);
}

.page-about .rules__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-500);
}

.page-about .about-cta {
  margin-top: clamp(34px, 5vw, 52px);
  padding: 24px 20px;
  background: var(--paper-100);
  border-left: 3px solid var(--gold-500);
}

.page-about .about-cta__main {
  margin-bottom: 18px;
}

.page-about .about-cta__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.45;
  color: var(--ink-900);
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-500);
}

.page-about .about-cta .btn {
  display: inline-block;
  width: auto;
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cta__links a {
  font-size: 14px;
  color: var(--ink-700);
  text-decoration: none;
  border-bottom: 1px solid var(--gold-line);
  padding-bottom: 2px;
}

.page-about .about-cta__links a:hover,
.page-about .about-cta__links a:focus-visible {
  color: var(--gold-700);
  border-bottom-color: var(--gold-500);
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding-top: 30px;
    padding-bottom: 64px;
  }

  .page-about .about-cta {
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "main btn"
      "links links";
    gap: 20px 24px;
    align-items: start;
    padding: 26px 28px;
  }

  .page-about .about-cta__main {
    grid-area: main;
    margin-bottom: 0;
  }

  .page-about .about-cta .btn {
    grid-area: btn;
  }

  .page-about .about-cta__links {
    grid-area: links;
    margin-top: 0;
    padding-top: 14px;
    border-top: 1px solid var(--line);
  }

  .page-about .rules__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 30px;
  }

  .page-about .rv__col {
    flex: 0 0 60%;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
  }

  .page-about .about-index {
    margin-top: 36px;
  }

  .page-about .about-hero__lead .lede {
    font-size: 17px;
  }

  .page-about .tl__item {
    padding-left: 46px;
  }

  .page-about .tl::before {
    left: 6px;
  }

  .page-about .tl__summary {
    grid-template-columns: 92px 1fr auto;
    gap: 4px 16px;
  }

  .page-about .tl__stage {
    justify-self: start;
  }

  .page-about .tl__title {
    font-size: 21px;
  }

  .page-about .teams__grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .teams__list {
    margin-top: 24px;
  }

  .page-about .rv__grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .rv__col {
    flex: none;
    padding: 26px 22px 28px;
  }

  .page-about .metric {
    grid-template-columns: minmax(0, 14em) 1fr auto;
    gap: 16px;
    padding: 20px 0;
  }

  .page-about .metric__rule {
    display: block;
  }

  .page-about .eco__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

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

@media (min-width: 1120px) {
  .page-about .about-hero__lead h1 {
    font-size: 58px;
  }

  .page-about .about-hero__facts {
    gap: 18px;
  }

  .page-about .rv__col--b {
    padding-top: 26px;
  }
}

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

  .page-about .team:hover .team__hex,
  .page-about .team:focus-within .team__hex {
    transform: none;
  }
}
<<<END>>>