.page-about {
  --about-aside: 300px;
  --about-num-size: clamp(48px, 6vw, 76px);
  display: block;
  background: var(--ink-950);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink-950);
  border-bottom: 1px solid var(--line);
}
.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.32;
}
.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(6, 21, 41, 0.46) 0%, rgba(6, 21, 41, 0.9) 58%, var(--ink-950) 100%),
    linear-gradient(90deg, rgba(6, 21, 41, 0.92) 0%, rgba(6, 21, 41, 0.24) 78%);
}
.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 18px;
  padding-block: clamp(56px, 9vw, 116px) clamp(44px, 6vw, 76px);
}
.page-about .about-hero__lead {
  max-width: 40em;
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--text-2);
}
.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 5vw, 58px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--text-1);
  max-width: 22em;
}
.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 10px;
  max-width: 820px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .about-hero__stats > .stat {
  background: rgba(11, 30, 58, 0.86);
  padding: 16px 18px;
  display: grid;
  gap: 4px;
  min-width: 0;
}
.page-about .about-hero__stats .stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1;
  font-weight: 700;
  color: var(--amber);
}
.page-about .about-hero__stats .stat__value small {
  font-size: 0.55em;
  margin-left: 2px;
  color: var(--green);
}
.page-about .about-hero__stats .stat__label {
  font-size: var(--fs-12);
  line-height: 1.5;
  color: var(--text-2);
}

/* ---------- 双栏手册章节 ---------- */
.page-about .about-split {
  display: grid;
  gap: 26px;
}
.page-about .about-split__aside {
  display: grid;
  gap: 6px;
  align-content: start;
}
.page-about .about-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--about-num-size);
  line-height: 0.9;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--green);
  opacity: 0.3;
  transition: opacity 0.55s var(--ease), color 0.55s var(--ease);
}
.page-about [data-reveal][data-visible] .about-num {
  opacity: 1;
}
.page-about .about-kicker {
  margin: 0;
  font-family: var(--font-cond);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-2);
}
.page-about .about-split__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text-1);
}
.page-about .about-split__body {
  display: grid;
  gap: 20px;
  min-width: 0;
}
.page-about .about-lede {
  margin: 0;
  max-width: 38em;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--text-2);
}
.page-about .about-note {
  margin: 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  max-width: 38em;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--text-2);
}

/* 要点列表：绿短横线 */
.page-about .about-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .about-points li {
  position: relative;
  padding-left: 34px;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--text-1);
}
.page-about .about-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 18px;
  height: 2px;
  background: var(--green);
  transition: width 0.25s var(--ease), background-color 0.25s var(--ease);
}
.page-about .about-points li:hover::before {
  width: 28px;
  background: var(--amber);
}

/* ---------- 七年刻度 ---------- */
.page-about .about-sub {
  margin: 12px 0 0;
  max-width: 40em;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--text-2);
}
.page-about .track {
  position: relative;
  margin-top: clamp(28px, 4vw, 52px);
}
.page-about .track__line {
  display: none;
}
.page-about .track__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  position: relative;
  z-index: 1;
}
.page-about .track__node {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  column-gap: 16px;
  padding: 18px;
  background: var(--ink-900);
  border: 1px solid var(--line);
  outline-offset: 2px;
  transition: border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}
.page-about .track__node:focus-visible {
  outline: 2px solid var(--amber);
}
.page-about .track__year {
  grid-column: 1;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-20);
  font-weight: 700;
  line-height: 1.2;
  color: var(--amber);
}
.page-about .track__dot {
  grid-column: 1;
  width: 10px;
  height: 10px;
  margin-top: 2px;
  background: var(--green);
  transition: background-color 0.25s var(--ease), transform 0.25s var(--ease);
}
.page-about .track__detail {
  grid-column: 2;
  grid-row: 1 / span 2;
  min-width: 0;
}
.page-about .track__detail h3 {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: var(--fs-16);
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--text-1);
}
.page-about .track__detail p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--text-2);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .team-card {
  background: var(--ink-900);
  padding: 22px 20px 24px;
  display: grid;
  gap: 8px;
  align-content: start;
  min-width: 0;
  transition: background-color 0.25s var(--ease);
}
.page-about .team-card:hover {
  background: var(--ink-800);
}
.page-about .team-card__num {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 40px;
  line-height: 1;
  font-weight: 700;
  color: var(--amber);
}
.page-about .team-card h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: var(--fs-20);
  color: var(--text-1);
}
.page-about .team-card p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--text-2);
}

/* ---------- 四道工序 ---------- */
.page-about .about-flow {
  background: var(--ink-900);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.page-about .about-flow__head {
  display: grid;
  gap: 12px;
  max-width: 44em;
}
.page-about .about-flow__head .about-num {
  opacity: 0.45;
}
.page-about .about-flow__grid {
  display: grid;
  gap: 28px;
  margin-top: clamp(26px, 4vw, 44px);
  align-items: start;
}
.page-about .flow-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.page-about .flow-item {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 4px 18px 0;
  background: var(--ink-900);
  transition: background-color 0.25s var(--ease);
}
.page-about .flow-item:hover {
  background: var(--ink-800);
}
.page-about .flow-item__idx {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--green);
  padding-top: 3px;
}
.page-about .flow-item h3 {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: var(--fs-20);
  color: var(--text-1);
}
.page-about .flow-item p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--text-2);
}
.page-about .about-flow__figure {
  margin: 0;
  display: grid;
  gap: 10px;
}
.page-about .about-flow__figure .figure__media {
  border: 1px solid var(--line);
  background: var(--ink-800);
  overflow: hidden;
}
.page-about .about-flow__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 合作 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: 1px;
  margin-top: clamp(24px, 3vw, 40px);
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .partner-card {
  border: 0;
  padding: 24px 20px 26px;
  display: grid;
  gap: 12px;
  align-content: start;
  min-width: 0;
}
.page-about .partner-card p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--text-2);
}
.page-about .partner-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 4px;
}
.page-about .about-partner__figure {
  margin: clamp(28px, 4vw, 48px) 0 0;
  display: grid;
  gap: 10px;
}
.page-about .about-partner__figure .figure__media {
  border: 1px solid var(--line);
  overflow: hidden;
}
.page-about .about-partner__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 联系 ---------- */
.page-about .about-contact {
  background: var(--ink-900);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.page-about .about-contact__inner {
  display: grid;
  gap: 30px;
}
.page-about .about-contact__lead {
  display: grid;
  gap: 10px;
  max-width: 40em;
}
.page-about .about-contact__lead .about-num {
  opacity: 0.3;
}
.page-about .about-contact__lead p {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--text-2);
}
.page-about .about-contact__cards {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .contact-card {
  background: var(--ink-950);
  padding: 22px 20px 24px;
  display: grid;
  gap: 10px;
  align-content: start;
  min-width: 0;
  transition: background-color 0.25s var(--ease);
}
.page-about .contact-card:hover {
  background: var(--ink-800);
}
.page-about .contact-card__label {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: var(--fs-16);
  line-height: 1.4;
  color: var(--amber);
}
.page-about .contact-card p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--text-2);
}
.page-about .contact-card__link {
  justify-self: start;
  margin-top: 2px;
  font-size: var(--fs-14);
  font-weight: 700;
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .contact-card__link:hover,
.page-about .contact-card__link:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
}
.page-about .about-contact__direct {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}
.page-about .contact-direct {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  color: var(--text-1);
  text-decoration: none;
  word-break: break-all;
}
.page-about a.contact-direct:hover,
.page-about a.contact-direct:focus-visible {
  color: var(--amber);
}
.page-about .contact-direct__sep {
  width: 1px;
  height: 16px;
  background: var(--line);
}

/* ---------- 出口链接 ---------- */
.page-about .about-links__title {
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--text-1);
}
.page-about .link-row {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .link-card {
  display: grid;
  gap: 8px;
  padding: 20px;
  background: var(--ink-900);
  text-decoration: none;
  min-width: 0;
  border-left: 2px solid transparent;
  transition: background-color 0.25s var(--ease), border-color 0.25s var(--ease);
}
.page-about .link-card:hover,
.page-about .link-card:focus-visible {
  background: var(--ink-800);
  border-left-color: var(--green);
}
.page-about .link-card__label {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: var(--fs-16);
  color: var(--text-1);
}
.page-about .link-card__desc {
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--text-2);
}

/* ---------- 中屏 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .link-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 桌面：窄栏 + 宽栏 ---------- */
@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, var(--about-aside)) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
  }
  .page-about .about-split--flip .about-split__aside {
    order: 2;
  }
  .page-about .about-split--flip .about-split__body {
    order: 1;
  }
  .page-about .about-split__body {
    border-left: 1px solid var(--line);
    padding-left: clamp(24px, 3vw, 46px);
  }
  .page-about .about-split--flip .about-split__aside {
    border-left: 1px solid var(--line);
    padding-left: clamp(24px, 3vw, 46px);
  }
  .page-about .about-split--flip .about-split__body {
    border-left: 0;
    padding-left: 0;
  }
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-contact__inner {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.44fr);
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }
  .page-about .about-contact__cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-flow__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 60px);
  }
}

/* ---------- 宽屏：七段横排刻度 ---------- */
@media (min-width: 1200px) {
  .page-about .track {
    padding-top: 12px;
  }
  .page-about .track__line {
    display: block;
    position: absolute;
    left: 0;
    right: 0;
    top: 40px;
    height: 1px;
    background: var(--line);
    z-index: 0;
  }
  .page-about .track__list {
    grid-template-columns: repeat(7, minmax(0, 1fr));
    gap: 0;
  }
  .page-about .track__node {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: 28px 24px auto;
    column-gap: 0;
    padding: 0 18px 0 0;
    background: transparent;
    border: 0;
    border-top: 0;
  }
  .page-about .track__year {
    grid-column: 1;
    grid-row: 1;
    font-size: var(--fs-20);
    line-height: 28px;
  }
  .page-about .track__dot {
    grid-column: 1;
    grid-row: 2;
    width: 10px;
    height: 10px;
    margin: 7px 0;
  }
  .page-about .track__detail {
    grid-column: 1;
    grid-row: 3;
  }
  .page-about .track__detail h3 {
    font-size: var(--fs-14);
  }
  .page-about .track__detail p {
    font-size: var(--fs-12);
    line-height: 1.65;
  }
  .page-about .track__node:hover .track__dot,
  .page-about .track__node:focus-visible .track__dot {
    background: var(--amber);
    transform: scale(1.35);
  }
}

@media (hover: hover) and (min-width: 1200px) {
  .page-about .track__detail {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.4s var(--ease), opacity 0.35s var(--ease), margin-top 0.4s var(--ease);
  }
  .page-about .track__node:hover .track__detail,
  .page-about .track__node:focus .track__detail,
  .page-about .track__node:focus-within .track__detail {
    max-height: 360px;
    opacity: 1;
    margin-top: 12px;
  }
  .page-about .track__node:hover .track__year,
  .page-about .track__node:focus .track__year {
    color: var(--green);
  }
}
<<<END>>>