.page-about {
  --about-sec-gap: clamp(44px, 7vw, 88px);
  --about-card-bg: var(--panel);
  --about-card-bg-2: var(--panel-2);
  color: var(--text);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  padding-block: clamp(18px, 3vw, 30px) clamp(36px, 6vw, 72px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -10% -8% auto -8%;
  height: 62%;
  background: radial-gradient(62% 100% at 18% 0%, rgba(18, 58, 51, 0.75), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero > * {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__text {
  display: grid;
  gap: clamp(14px, 2vw, 22px);
  align-content: start;
}

.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--text);
  text-transform: uppercase;
}

.page-about .about-hero__eyebrow .mono {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--yellow);
  border: 1px solid var(--line);
  padding: 2px 7px;
  background: var(--panel-2);
}

.page-about .about-hero__title {
  font-size: clamp(2rem, 6vw, 4.2rem);
  font-weight: 300;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--white);
  max-width: 15em;
}

.page-about .about-hero__lead {
  max-width: 34em;
  font-size: clamp(1rem, 1.4vw, 1.0625rem);
  line-height: 1.78;
  color: var(--text);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

.page-about .about-hero__media {
  margin: 0;
  position: relative;
  overflow: hidden;
  background: linear-gradient(160deg, var(--glow), var(--ink) 72%);
  clip-path: polygon(9% 0, 100% 0, 100% 100%, 0 100%, 0 11%);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  opacity: 0.86;
  filter: saturate(1.05) contrast(1.05);
}

/* ---------- 外壳：左索引 + 右内容 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .about-rail {
  position: static;
}

.page-about .about-rail__list {
  display: flex;
  gap: 18px;
  margin: 0;
  padding: 12px 2px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-rail__list > li {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 4px 0;
  font-size: 13px;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible,
.page-about .about-rail__link[aria-current="true"] {
  color: var(--white);
  border-bottom-color: var(--yellow);
}

.page-about .about-rail__num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--yellow);
  letter-spacing: 0.06em;
}

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

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

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: clamp(20px, 3vw, 36px);
}

.page-about .about-head {
  display: grid;
  gap: 10px;
  max-width: 46em;
  margin-bottom: clamp(24px, 4vw, 46px);
}

.page-about .about-head__num {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--yellow);
}

.page-about .about-head__title {
  font-size: clamp(1.4rem, 3.4vw, 2.35rem);
  font-weight: 300;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-head__lead {
  font-size: 1rem;
  line-height: 1.78;
  color: var(--text);
}

.page-about .about-note {
  margin-top: clamp(18px, 2.5vw, 30px);
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--text);
}

.page-about .about-note a {
  color: var(--yellow-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: border-color 0.18s ease, color 0.18s ease;
}

.page-about .about-note a:hover,
.page-about .about-note a:focus-visible {
  color: var(--yellow);
  border-bottom-color: var(--yellow);
}

/* ---------- 01 服务对象 ---------- */
.page-about .about-users {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-user {
  background: var(--about-card-bg);
  padding: clamp(18px, 2.6vw, 28px);
  display: grid;
  gap: 8px;
  align-content: start;
  transition: background 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-user:hover {
  background: var(--about-card-bg-2);
  box-shadow: inset 0 0 0 1px var(--yellow);
}

.page-about .about-user__idx {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--yellow);
}

.page-about .about-user__title {
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

.page-about .about-user__text {
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--text);
}

/* ---------- 02 时间轴 ---------- */
.page-about .about-timeline-wrap {
  position: relative;
  padding: clamp(16px, 3vw, 28px) clamp(0px, 1vw, 12px);
  background: radial-gradient(120% 96% at 16% 0%, rgba(47, 224, 138, 0.1), transparent 64%);
}

.page-about .about-timeline {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding-left: 28px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--line);
}

.page-about .about-node {
  position: relative;
  padding: 0 0 clamp(26px, 3vw, 36px) 0;
}

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

.page-about .about-node__tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--yellow);
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 3px 9px;
  margin-bottom: 12px;
}

.page-about .about-node__dot {
  position: absolute;
  left: -28px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--yellow);
  box-shadow: 0 0 0 4px rgba(233, 255, 60, 0.14);
}

.page-about .about-node__title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--white);
  line-height: 1.4;
  margin-bottom: 6px;
}

.page-about .about-node__text {
  font-size: 0.9375rem;
  line-height: 1.76;
  color: var(--text);
  max-width: 34em;
}

/* ---------- 03 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
}

.page-about .about-team__media {
  margin: 0;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--glow), var(--ink) 78%);
  overflow: hidden;
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  opacity: 0.85;
}

.page-about .about-team__cap {
  font-size: 12px;
  line-height: 1.6;
  color: var(--text);
  padding: 10px 12px;
  border-top: 1px solid var(--line);
  background: var(--panel-2);
}

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

.page-about .about-role {
  background: var(--about-card-bg);
  padding: clamp(16px, 2.4vw, 24px);
  display: grid;
  gap: 7px;
  align-content: start;
  transition: background 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-role:hover {
  background: var(--about-card-bg-2);
  box-shadow: inset 0 0 0 1px var(--yellow);
}

.page-about .about-role__idx {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--yellow);
}

.page-about .about-role__title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--white);
  line-height: 1.4;
}

.page-about .about-role__text {
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--text);
}

/* ---------- 04 覆盖数字 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-stat {
  background: var(--about-card-bg-2);
  padding: clamp(16px, 2.4vw, 24px);
  display: grid;
  gap: 6px;
  align-content: start;
}

.page-about .about-stat__v {
  font-family: var(--mono);
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--yellow);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__l {
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--text);
}

.page-about .about-cadence {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-cadence__title {
  font-size: 0.8125rem;
  font-family: var(--mono);
  letter-spacing: 0.14em;
  color: var(--green);
  margin-bottom: 12px;
}

.page-about .about-cadence__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-cadence__list li {
  position: relative;
  padding-left: 16px;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--text);
  border-bottom: 1px dashed var(--line-soft);
  padding-bottom: 8px;
}

.page-about .about-cadence__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
}

/* ---------- 05 合作 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
}

.page-about .about-partners__text {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .about-partners__text p {
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--text);
  max-width: 36em;
}

.page-about .about-partners__honor {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--white);
  font-size: 0.9375rem;
}

.page-about .about-partners__btn {
  justify-self: start;
  margin-top: 4px;
}

.page-about .about-partners__media {
  margin: 0;
  border: 1px solid var(--line);
  background: linear-gradient(200deg, var(--glow), var(--ink) 76%);
  overflow: hidden;
}

.page-about .about-partners__media img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  opacity: 0.85;
}

.page-about .about-partners__cap {
  font-size: 12px;
  line-height: 1.6;
  color: var(--text);
  padding: 10px 12px;
  border-top: 1px solid var(--line);
  background: var(--panel-2);
}

/* ---------- 06 联系 ---------- */
.page-about .about-sec--last {
  padding-bottom: clamp(30px, 5vw, 60px);
}

.page-about .about-tabs {
  border: 1px solid var(--line);
  background: var(--about-card-bg);
}

.page-about .about-tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-bottom: 1px solid var(--line);
  background: var(--panel-2);
}

.page-about .about-tabs__tab {
  appearance: none;
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  color: var(--text);
  font: inherit;
  font-size: 0.9375rem;
  padding: 14px 20px;
  cursor: pointer;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.page-about .about-tabs__tab:hover {
  color: var(--white);
  background: rgba(233, 255, 60, 0.05);
}

.page-about .about-tabs__tab[aria-selected="true"] {
  color: var(--white);
  border-bottom-color: var(--yellow);
  background: var(--about-card-bg);
}

.page-about .about-tabs__tab:focus-visible {
  outline: 2px solid var(--yellow);
  outline-offset: -2px;
}

.page-about .about-tabs__panel {
  padding: clamp(18px, 3vw, 30px);
  display: grid;
  gap: 14px;
}

.page-about .about-tabs__panel[hidden] {
  display: none;
}

.page-about .about-tabs__panel p {
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--text);
  max-width: 38em;
}

.page-about .about-dl {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 4px 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-dl dt {
  background: var(--panel-2);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--yellow);
  padding: 10px 14px;
}

.page-about .about-dl dd {
  margin: 0;
  background: var(--about-card-bg);
  padding: 10px 14px;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--white);
}

.page-about .about-dl dd a {
  color: var(--yellow-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.page-about .about-dl dd a:hover,
.page-about .about-dl dd a:focus-visible {
  color: var(--yellow);
  border-bottom-color: var(--yellow);
}

/* ---------- 响应式：≥620px ---------- */
@media (min-width: 620px) {
  .page-about .about-users {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-cadence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-dl {
    grid-template-columns: 140px minmax(0, 1fr);
  }
}

/* ---------- 响应式：≥900px ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: clamp(32px, 5vw, 72px);
    padding-block: clamp(24px, 3vw, 40px) clamp(56px, 7vw, 96px);
  }

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

  .page-about .about-team,
  .page-about .about-partners {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: clamp(24px, 4vw, 48px);
  }

  .page-about .about-partners__media {
    order: 2;
  }

  .page-about .about-partners__text {
    order: 1;
  }

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

  .page-about .about-role--wide {
    grid-column: span 2;
  }

  /* 横向时间轴 */
  .page-about .about-timeline-wrap {
    padding: clamp(24px, 3vw, 40px) 0;
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    padding-left: 0;
    padding-top: 0;
  }

  .page-about .about-timeline::before {
    left: 0;
    right: 0;
    top: 100px;
    bottom: auto;
    width: auto;
    height: 1px;
  }

  .page-about .about-node {
    position: relative;
    padding: 122px 22px 0 0;
  }

  .page-about .about-node:last-child {
    padding-right: 0;
  }

  .page-about .about-node__tag {
    position: absolute;
    top: 0;
    left: 0;
    width: 62px;
    height: 74px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 0;
    font-size: 15px;
    letter-spacing: 0.04em;
  }

  .page-about .about-node__dot {
    left: 0;
    top: 100px;
    margin-top: -6px;
    box-shadow: 0 0 0 5px rgba(233, 255, 60, 0.14), 0 0 18px rgba(233, 255, 60, 0.28);
  }

  .page-about .about-node__title {
    font-size: 1rem;
  }

  .page-about .about-node__text {
    font-size: 0.875rem;
    line-height: 1.72;
  }
}

/* ---------- 响应式：≥1000px ---------- */
@media (min-width: 1000px) {
  .page-about .about-shell {
    grid-template-columns: 164px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 60px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--hdr-h) + 24px);
    align-self: start;
  }

  .page-about .about-rail__list {
    display: grid;
    gap: 2px;
    padding: 0;
    overflow: visible;
    border-top: 1px solid var(--line);
    border-bottom: 0;
  }

  .page-about .about-rail__link {
    display: flex;
    align-items: baseline;
    justify-content: flex-start;
    gap: 10px;
    width: 100%;
    padding: 9px 8px;
    font-size: 12.5px;
    border-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible,
  .page-about .about-rail__link[aria-current="true"] {
    border-left-color: var(--yellow);
    background: rgba(233, 255, 60, 0.06);
  }

  .page-about .about-stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

/* ---------- 偏好降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-user,
  .page-about .about-role,
  .page-about .about-rail__link,
  .page-about .about-tabs__tab {
    transition: none;
  }
}
<<<END>>>