.page-about {
  --about-max: 1160px;
  --about-pad: clamp(16px, 4vw, 40px);
  --about-years: 104px;
  color: var(--white);
  padding-bottom: clamp(56px, 9vw, 104px);
}

.page-about .about-frame {
  width: 100%;
  max-width: var(--about-max);
  margin: 0 auto;
  padding: clamp(20px, 3vw, 40px) var(--about-pad) 0;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .crumbs-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .crumbs-item + .crumbs-item::before {
  content: "/";
  margin-right: 8px;
  color: rgba(159, 195, 200, 0.45);
}

.page-about .crumbs-item a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 220ms var(--ease);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 26px;
  padding-bottom: clamp(30px, 5vw, 52px);
  border-bottom: 1px solid var(--line);
}

.page-about h1 {
  font-size: var(--fs-display);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.012em;
  margin: 12px 0 0;
  color: var(--white);
}

.page-about .about-hero__text .lead {
  margin-top: 18px;
  color: var(--mist);
  max-width: 60ch;
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .about-figure {
  padding: 13px 13px 12px;
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  background: linear-gradient(180deg, rgba(14, 47, 74, 0.75), rgba(6, 23, 38, 0.6));
  min-width: 0;
}

.page-about .about-figure dt {
  font-size: 11px;
  letter-spacing: 0.1em;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .about-figure dd {
  margin: 7px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(1.1rem, 3.4vw, 1.6rem);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.page-about .about-hero__media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-l);
  overflow: hidden;
  background: linear-gradient(160deg, var(--deep), var(--ink-deep));
  box-shadow: var(--shadow-card);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .media-cap {
  margin: 0;
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--mist);
  border-top: 1px solid var(--line);
  background: rgba(4, 18, 28, 0.5);
}

/* ---------- 章节通用 ---------- */
.page-about .section {
  margin-top: clamp(48px, 8vw, 92px);
}

.page-about .section-head h2 {
  font-size: var(--fs-h2);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 10px 0 0;
  color: var(--white);
}

.page-about .section-head .lead {
  margin-top: 14px;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__grid {
  display: grid;
  gap: 20px;
  margin-top: 30px;
}

.page-about .about-years__label {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-years__list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-years__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color 240ms var(--ease), border-color 240ms var(--ease);
}

.page-about .about-years__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  flex: none;
}

.page-about .about-years__link:hover,
.page-about .about-years__link:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

.page-about .about-years__link:hover .about-years__dot,
.page-about .about-years__link:focus-visible .about-years__dot {
  background: var(--orange);
}

.page-about .about-stages {
  display: grid;
  gap: 16px;
  min-width: 0;
}

.page-about .stage {
  position: relative;
  padding: 20px clamp(16px, 3vw, 28px) 22px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--line-strong);
  border-radius: var(--r-m);
  background: linear-gradient(180deg, rgba(14, 47, 74, 0.6), rgba(6, 23, 38, 0.45));
  transition: border-left-color 260ms var(--ease), transform 260ms var(--ease), box-shadow 260ms var(--ease);
  scroll-margin-top: 96px;
}

.page-about .stage:hover {
  border-left-color: var(--orange);
  transform: translateY(-2px);
  box-shadow: 0 20px 34px -28px rgba(0, 0, 0, 0.9);
}

.page-about .stage__top {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.page-about .stage__no {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .stage h3 {
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1.35;
  margin: 12px 0 10px;
  color: var(--white);
}

.page-about .stage p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .stage__summary {
  margin-top: 14px !important;
  padding: 10px 13px;
  font-size: 13px !important;
  line-height: 1.7 !important;
  color: var(--cyan) !important;
  border-top: 1px dashed var(--line);
  background: rgba(34, 224, 214, 0.05);
  border-radius: var(--r-s);
}

.page-about .about-archive {
  margin: 6px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  overflow: hidden;
  background: linear-gradient(150deg, var(--slate), var(--ink));
}

.page-about .about-archive img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 团队 ---------- */
.page-about .filter-bar {
  margin: 26px 0 18px;
}

.page-about .team-table {
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  background: var(--line);
  overflow: hidden;
}

.page-about .team-row {
  display: grid;
  gap: 8px;
  padding: 18px clamp(14px, 3vw, 24px);
  background: rgba(6, 23, 38, 0.72);
  transition: background 240ms var(--ease);
}

.page-about .team-row:hover {
  background: rgba(14, 47, 74, 0.7);
}

.page-about .team-row[data-hidden="true"] {
  display: none;
}

.page-about .team-role {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .team-duty {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .team-scene {
  margin: 22px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  overflow: hidden;
  background: linear-gradient(150deg, var(--deep), var(--ink));
}

.page-about .team-scene img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* ---------- 更新节奏（暖纸分区） ---------- */
.page-about .about-cadence {
  padding: clamp(24px, 4vw, 44px);
  border: 1px solid var(--line-paper);
  border-radius: var(--r-l);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(255, 106, 43, 0.14), transparent 62%),
    var(--paper);
  color: var(--ink);
}

.page-about .about-cadence .eyebrow {
  color: rgba(6, 23, 38, 0.6);
}

.page-about .about-cadence h2 {
  font-size: var(--fs-h2);
  font-weight: 900;
  line-height: 1.2;
  margin: 10px 0 0;
  color: var(--ink);
}

.page-about .cadence-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-paper);
  border-top: 1px solid var(--line-paper);
}

.page-about .cadence-item {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  background: var(--paper);
  border-bottom: 1px solid var(--line-paper);
}

.page-about .cadence-item__key {
  font-size: clamp(1.15rem, 3.6vw, 1.6rem);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
  color: var(--orange);
}

.page-about .cadence-item__text {
  font-size: 15px;
  line-height: 1.75;
  color: var(--deep);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners__grid {
  display: grid;
  gap: 28px;
  align-items: center;
}

.page-about .about-partners__text h2 {
  font-size: var(--fs-h2);
  font-weight: 900;
  line-height: 1.2;
  margin: 10px 0 0;
  color: var(--white);
}

.page-about .about-partners__text p {
  margin: 16px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-partners__text a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  transition: color 220ms var(--ease), border-color 220ms var(--ease);
}

.page-about .about-partners__text a:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.page-about .about-partners__graph {
  max-width: 360px;
  margin: 0 auto;
  width: 100%;
}

.page-about .about-partners__graph svg {
  display: block;
  width: 100%;
  height: auto;
  filter: drop-shadow(0 14px 30px rgba(0, 0, 0, 0.5));
}

/* ---------- 长期承诺 ---------- */
.page-about .promise-grid {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .promise-grid .plaque {
  min-width: 0;
}

.page-about .about-next {
  margin-top: 26px;
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  background: linear-gradient(120deg, rgba(14, 47, 74, 0.85), rgba(11, 59, 58, 0.5));
}

.page-about .about-next__text {
  margin: 0;
  max-width: 66ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .cadence-item {
    grid-template-columns: minmax(120px, 160px) minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
  }

  .page-about .team-row {
    grid-template-columns: 150px minmax(0, 1fr);
    align-items: start;
    gap: 20px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: 5fr 7fr;
    gap: clamp(30px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-hero__media img {
    aspect-ratio: 4 / 3;
  }

  .page-about .about-timeline__grid {
    grid-template-columns: var(--about-years) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-years {
    position: sticky;
    top: 88px;
  }

  .page-about .about-years__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-years__link {
    position: relative;
    display: flex;
    width: 100%;
    padding: 16px 0;
    border: 0;
    border-radius: 0;
    background: none;
    font-family: var(--font-mono);
    font-size: 14px;
    letter-spacing: 0.06em;
  }

  .page-about .about-years__link::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--line);
  }

  .page-about .about-years__link:last-child::before {
    bottom: 50%;
  }

  .page-about .about-years__dot {
    width: 9px;
    height: 9px;
    position: relative;
    z-index: 1;
    box-shadow: 0 0 0 4px var(--ink);
    transition: transform 240ms var(--ease);
  }

  .page-about .about-years__link:hover .about-years__dot {
    transform: scale(1.5);
  }

  .page-about .about-partners__grid {
    grid-template-columns: 7fr 5fr;
    gap: 48px;
  }

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

  .page-about .promise-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .promise-grid > :nth-child(1) {
    grid-column: span 7;
  }

  .page-about .promise-grid > :nth-child(2) {
    grid-column: span 5;
  }

  .page-about .promise-grid > :nth-child(3) {
    grid-column: span 12;
  }
}

@media (min-width: 1180px) {
  .page-about .about-stages {
    gap: 18px;
  }

  .page-about .stage {
    padding: 24px 30px 26px;
  }
}
<<<END>>>