.page-about {
  background: var(--ink);
  color: var(--text);
  font-family: var(--font-body);
}

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

.page-about .about-topbar {
  padding-top: clamp(92px, 13vw, 124px);
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  margin-top: clamp(12px, 2vw, 20px);
}

.page-about .about-hero__band {
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(150deg, var(--panel-2) 0%, var(--band) 58%, var(--ink) 100%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 56px), 0 100%);
}

.page-about .about-hero__inner {
  padding: clamp(28px, 4.5vw, 48px) 0 clamp(64px, 8vw, 96px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-hero__lead .tag {
  display: inline-block;
  margin-bottom: clamp(12px, 2vw, 18px);
  color: var(--cyan);
}

.page-about .about-hero__lead h1 {
  margin: 0 0 clamp(14px, 2.2vw, 22px);
  font-family: var(--font-head);
  font-size: clamp(34px, 7vw, 64px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-hero__deck {
  margin: 0 0 clamp(20px, 3vw, 28px);
  max-width: 46ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__media {
  margin: 0;
  position: relative;
}

.page-about .about-hero__media img {
  width: 100%;
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
  object-fit: cover;
  filter: saturate(0.7) contrast(1.08);
}

.page-about .about-hero__media figcaption {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-figures {
  list-style: none;
  margin: clamp(32px, 5vw, 56px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .about-figures__item {
  background: var(--ink);
  padding: clamp(14px, 2.2vw, 22px);
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .about-figures__num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1;
  color: var(--gold);
  letter-spacing: -0.02em;
}

.page-about .about-figures__unit {
  font-size: 13px;
  color: var(--text);
  letter-spacing: 0.04em;
}

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

/* ---------- 主体两栏 ---------- */

.page-about .about-shell {
  display: grid;
  gap: clamp(24px, 3.5vw, 48px);
  padding: clamp(48px, 7vw, 88px) 0 clamp(56px, 8vw, 104px);
}

.page-about .about-rail {
  display: none;
}

.page-about .about-main {
  min-width: 0;
}

/* ---------- 章节 ---------- */

.page-about .about-sec {
  padding: clamp(24px, 3.6vw, 40px) 0;
}

.page-about .about-sec__head {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 20px);
  padding-bottom: clamp(12px, 2vw, 18px);
  margin-bottom: clamp(16px, 2.6vw, 28px);
  border-bottom: 2px solid var(--line);
}

.page-about .about-sec__num {
  flex: none;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1;
  padding: 5px 9px;
  color: var(--cyan);
  border: 2px solid var(--cyan);
}

.page-about .about-sec__head h2 {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(22px, 3.6vw, 34px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-sec__body p {
  max-width: 62ch;
  margin: 0 0 1.1em;
  font-size: clamp(15px, 1.55vw, 16.5px);
  line-height: 1.8;
  color: var(--text-dim);
}

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

.page-about .about-sec__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: border-color var(--ease), color var(--ease);
}

.page-about .about-sec__body a:hover {
  border-bottom-color: var(--cyan);
  color: var(--cyan-dim);
}

.page-about .about-sec__closing {
  margin-top: clamp(20px, 3vw, 30px);
  max-width: 62ch;
  font-size: clamp(15px, 1.55vw, 16.5px);
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-sec__closing a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: border-color var(--ease), color var(--ease);
}

.page-about .about-sec__closing a:hover {
  border-bottom-color: var(--cyan);
  color: var(--cyan-dim);
}

.page-about .about-slash {
  height: clamp(14px, 2.4vw, 26px);
  margin: clamp(10px, 2vw, 22px) 0;
  background: repeating-linear-gradient(-62deg, var(--band) 0 9px, var(--panel-2) 9px 18px);
  clip-path: polygon(0 0, 100% 42%, 100% 100%, 0 58%);
}

/* ---------- 团队 ---------- */

.page-about .about-sec__body--split {
  display: grid;
  gap: clamp(24px, 3.5vw, 40px);
}

.page-about .team-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--line-soft);
}

.page-about .team-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 2.4vw, 26px);
  align-items: baseline;
  padding: clamp(14px, 2.2vw, 20px) clamp(4px, 1vw, 10px);
  border-bottom: 2px solid var(--line-soft);
  transition: background var(--ease), border-color var(--ease);
}

.page-about .team-row__num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 5vw, 44px);
  line-height: 1;
  color: var(--gold);
  transition: color var(--ease);
}

.page-about .team-row__text h3 {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: clamp(17px, 2.2vw, 21px);
  letter-spacing: 0;
  color: var(--text);
}

.page-about .team-row__text p {
  margin: 0;
  max-width: 52ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .team-row:hover {
  background: var(--panel);
  border-bottom-color: var(--cyan);
}

.page-about .team-row:hover .team-row__num {
  color: var(--cyan);
}

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

.page-about .about-sec__figure img {
  width: 100%;
  border: 2px solid var(--line);
  box-shadow: var(--shadow-soft);
  object-fit: cover;
  filter: saturate(0.65) contrast(1.06);
}

.page-about .about-sec__figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

/* ---------- 更新节奏 ---------- */

.page-about .std-list {
  list-style: none;
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 2px solid var(--line-soft);
}

.page-about .std-item {
  background: var(--ink);
  display: grid;
  grid-template-columns: minmax(72px, auto) minmax(0, 1fr);
  gap: clamp(14px, 2.4vw, 28px);
  align-items: start;
  padding: clamp(14px, 2.2vw, 22px);
  transition: background var(--ease);
}

.page-about .std-item__time {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(16px, 2.4vw, 22px);
  line-height: 1.2;
  color: var(--cyan);
  border-left: 2px solid var(--line);
  padding-left: 10px;
}

.page-about .std-item__text h3 {
  margin: 0 0 6px;
  font-size: 15.5px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--text);
}

.page-about .std-item__text p {
  margin: 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .std-item:hover {
  background: var(--panel);
}

/* ---------- 历程时间线 ---------- */

.page-about .about-sec__figure--wide img {
  aspect-ratio: 5 / 3;
}

.page-about .era-list {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .era-list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--band) 55%, var(--line-soft) 100%);
}

.page-about .era {
  position: relative;
  padding: 0 clamp(0px, 1vw, 8px) clamp(24px, 4vw, 38px) 32px;
}

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

.page-about .era::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 12px;
  height: 12px;
  border: 2px solid var(--cyan);
  background: var(--ink);
  transition: background var(--ease);
}

.page-about .era:hover::before {
  background: var(--cyan);
}

.page-about .era__stage {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .era__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: clamp(18px, 2.4vw, 23px);
  line-height: 1.24;
  color: var(--text);
}

.page-about .era__text {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
}

/* ---------- 协作生态 ---------- */

.page-about .eco-grid {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(1, minmax(0, 1fr));
  gap: 2px;
  background: var(--line-soft);
  border: 2px solid var(--line-soft);
}

.page-about .eco-cell {
  background: var(--ink);
  padding: clamp(16px, 2.4vw, 24px);
  display: flex;
  flex-direction: column;
  gap: 6px;
  border-top: 2px solid transparent;
  transition: background var(--ease), border-color var(--ease);
}

.page-about .eco-cell__num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1;
  color: var(--gold);
}

.page-about .eco-cell__label {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--text);
}

.page-about .eco-cell p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .eco-cell:hover {
  background: var(--panel);
  border-top-color: var(--cyan);
}

/* ---------- 响应式 ---------- */

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

@media (min-width: 760px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

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

  .page-about .about-sec__body--split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .about-shell {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: clamp(40px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-rail .rail-nav {
    display: flex;
    flex-direction: column;
    gap: 2px;
  }

  .page-about .about-rail .rail-nav__link {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 10px 12px;
    border-left: 2px solid var(--line-soft);
    color: var(--mist);
    font-size: 14px;
    text-decoration: none;
    transition: color var(--ease), border-color var(--ease), background var(--ease);
  }

  .page-about .about-rail .rail-nav__num {
    font-family: var(--font-num);
    font-variant-numeric: tabular-nums;
    font-size: 12px;
    letter-spacing: 0.1em;
    color: var(--line);
    transition: color var(--ease);
  }

  .page-about .about-rail .rail-nav__link:hover {
    color: var(--text);
    border-left-color: var(--cyan-dim);
    background: var(--panel);
  }

  .page-about .about-rail .rail-nav__link[aria-current="true"] {
    color: var(--text);
    border-left-color: var(--cyan);
    background: var(--panel-2);
  }

  .page-about .about-rail .rail-nav__link[aria-current="true"] .rail-nav__num {
    color: var(--cyan);
  }
}

@media (min-width: 1200px) {
  .page-about .eco-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
  }
}
<<<END>>>