.page-about {
  --about-ink: #061A2E;
  --about-ink-soft: #38495A;
  --about-gap: clamp(20px, 4vw, 48px);
  background: var(--deep);
  color: var(--ink);
  overflow-x: hidden;
}

.page-about a:focus-visible,
.page-about summary:focus-visible,
.page-about .chip:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 44px) 0 clamp(52px, 9vw, 108px);
  background:
    radial-gradient(120% 88% at 90% 0%, rgba(34, 231, 214, .13) 0%, transparent 58%),
    linear-gradient(168deg, var(--deep) 0%, var(--night) 55%, var(--abyss) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 14%;
  right: -18%;
  width: min(620px, 78vw);
  height: min(420px, 56vw);
  background: linear-gradient(132deg, rgba(34, 231, 214, .2) 0%, rgba(196, 98, 63, .16) 58%, rgba(242, 185, 75, .07) 100%);
  transform: rotate(20deg);
  border-radius: 6px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, rgba(34, 231, 214, .4) 22%, rgba(196, 98, 63, .3) 68%, transparent 100%);
}

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

.page-about .about-hero__intro {
  margin-top: clamp(28px, 6vw, 64px);
  max-width: 62rem;
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  font-family: var(--font-head);
  font-size: clamp(34px, 8.2vw, 78px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--ink);
  max-width: 13em;
}

.page-about .about-hero__lead {
  margin: 24px 0 0;
  max-width: 36em;
  font-size: clamp(16px, 2.1vw, 18px);
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 左右交替宽幅块 ---------- */
.page-about .about-spread {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

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

.page-about .about-spread__media .media-frame img,
.page-about .about-wide .media-frame img,
.page-about .about-tianjin__bg {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-caption {
  margin-top: 12px;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--ink-faint);
}

.page-about .about-wide {
  margin: 0 0 clamp(32px, 6vw, 64px);
}

/* ---------- 四条业务线 ---------- */
.page-about .about-tasks {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
}

.page-about .about-tasks__item {
  position: relative;
  padding: 26px 0 26px 58px;
  border-top: 1px solid var(--rule);
}

.page-about .about-tasks__item:last-child {
  border-bottom: 1px solid var(--rule);
}

.page-about .about-tasks__no {
  position: absolute;
  left: 0;
  top: 27px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--clay);
  border: 1px solid rgba(196, 98, 63, .55);
  border-radius: 2px;
  padding: 2px 6px;
  line-height: 1.4;
}

.page-about .about-tasks__item h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-tasks__item p {
  margin: 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 团队与分工 ---------- */
.page-about .about-team h2,
.page-about .about-gen h2,
.page-about .about-source h2,
.page-about .about-scale h2,
.page-about .about-tianjin h2,
.page-about .about-next h2 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-size: clamp(26px, 4.4vw, 44px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-team .chip-group {
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .about-roster-wrap {
  margin-top: clamp(24px, 4vw, 36px);
  padding: clamp(20px, 3vw, 40px);
  border-radius: 3px;
  color: var(--about-ink);
  box-shadow: 0 22px 48px rgba(2, 12, 22, .42);
}

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

.page-about .about-roster__item {
  padding: 22px 0;
  border-bottom: 1px solid rgba(6, 26, 46, .14);
}

.page-about .about-roster__item:first-child {
  padding-top: 0;
}

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

.page-about .about-roster__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 10px;
}

.page-about .about-roster__num {
  font-size: 26px;
  line-height: 1;
  color: var(--about-ink);
}

.page-about .about-roster__num small {
  margin-left: 4px;
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: .08em;
  color: rgba(6, 26, 46, .55);
}

.page-about .about-roster__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--about-ink);
}

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

.page-about .about-roster__empty {
  margin: 20px 0 0;
  font-size: 14px;
  color: var(--about-ink-soft);
}

/* ---------- 版本演进 ---------- */
.page-about .about-gen__head {
  max-width: 46em;
}

.page-about .about-gen__track {
  list-style: none;
  margin: clamp(32px, 6vw, 56px) 0 0;
  padding: 0;
}

.page-about .about-gen__node {
  position: relative;
  padding: 22px 0 30px 32px;
  background-image: linear-gradient(var(--rule), var(--rule));
  background-repeat: no-repeat;
  background-size: 1px 100%;
  background-position: 0 0;
}

.page-about .about-gen__node::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 32px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--stone);
}

.page-about .about-gen__node:last-child {
  padding-bottom: 0;
  background-image: linear-gradient(var(--rule), transparent);
}

.page-about .about-gen__node.is-current::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(34, 231, 214, .16);
}

.page-about .about-gen__node h3 {
  margin: 12px 0 8px;
  font-family: var(--font-head);
  font-size: clamp(18px, 2.6vw, 24px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-gen__node > p {
  margin: 0;
  max-width: 30em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-gen__more {
  margin-top: 12px;
}

.page-about .about-gen__more summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 0;
  cursor: pointer;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--cyan);
  list-style: none;
}

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

.page-about .about-gen__more summary::before {
  content: "+";
  font-size: 15px;
  line-height: 1;
}

.page-about .about-gen__more[open] summary::before {
  content: "\2212";
}

.page-about .about-gen__more p {
  margin: 6px 0 0;
  max-width: 30em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-faint);
}

/* ---------- 数据与画面来源 ---------- */
.page-about .about-source__grid {
  display: grid;
  gap: clamp(32px, 5vw, 56px);
}

.page-about .about-source__body .prose {
  margin-top: 18px;
}

.page-about .about-source__side {
  display: grid;
  align-content: start;
}

.page-about .about-source__stat {
  padding: 20px 0;
  border-top: 1px solid var(--rule);
}

.page-about .about-source__stat:last-child {
  border-bottom: 1px solid var(--rule);
}

.page-about .about-source__num {
  display: block;
  font-size: clamp(40px, 8vw, 64px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-source__label {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--ink-faint);
}

/* ---------- 覆盖与规模 ---------- */
.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: clamp(28px, 5vw, 48px) 0 0;
}

.page-about .about-scale__cell {
  padding: 24px 16px 24px 0;
  border-top: 1px solid var(--rule);
}

.page-about .about-scale__cell dt {
  margin-bottom: 12px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--ink-faint);
}

.page-about .about-scale__cell dd {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0;
}

.page-about .about-scale__num {
  font-size: clamp(38px, 9vw, 82px);
  line-height: .95;
  color: var(--mist);
}

.page-about .about-scale__unit {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--ink-faint);
}

.page-about .about-scale__note {
  margin-top: clamp(28px, 4vw, 44px);
  max-width: 44em;
}

.page-about .about-scale__note p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

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

.page-about .about-scale__note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 运营所在地 ---------- */
.page-about .about-tianjin__panel {
  position: relative;
  overflow: hidden;
  border-radius: 4px;
  background: var(--abyss);
}

.page-about .about-tianjin__bg {
  position: absolute;
  inset: 0;
  opacity: .48;
}

.page-about .about-tianjin__panel::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6, 26, 46, .38) 0%, rgba(4, 18, 31, .93) 70%);
  pointer-events: none;
}

.page-about .about-tianjin__body {
  position: relative;
  z-index: 1;
  padding: clamp(32px, 6vw, 72px) clamp(22px, 5vw, 64px);
}

.page-about .about-tianjin__body .prose {
  margin-top: 18px;
  max-width: 40em;
}

.page-about .about-tianjin__body .prose a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 页尾导流 ---------- */
.page-about .about-next__list {
  list-style: none;
  margin: clamp(22px, 4vw, 38px) 0 0;
  padding: 0;
}

.page-about .about-next__list li {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-top: 1px solid var(--rule);
}

.page-about .about-next__list li:last-child {
  border-bottom: 1px solid var(--rule);
}

.page-about .about-next__list a {
  font-family: var(--font-head);
  font-size: clamp(18px, 2.6vw, 22px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--cyan);
  text-decoration: none;
}

.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-about .about-next__list span {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-faint);
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 720px) {
  .page-about .about-roster {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-roster__item:nth-child(-n + 2) {
    padding-top: 0;
  }

  .page-about .about-scale__cell {
    padding-right: 28px;
  }

  .page-about .about-next__list li {
    grid-template-columns: 200px minmax(0, 1fr);
    align-items: baseline;
    gap: 28px;
  }
}

/* ---------- 宽屏：交错画册 ---------- */
@media (min-width: 900px) {
  .page-about .about-spread {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: clamp(32px, 5vw, 80px);
    row-gap: 0;
  }

  .page-about .about-spread__body {
    grid-column: 1 / span 7;
    grid-row: 1;
  }

  .page-about .about-spread__media {
    grid-column: 9 / span 4;
    grid-row: 1;
    padding-top: 8px;
  }

  .page-about .about-spread--flip .about-spread__body {
    grid-column: 6 / span 7;
  }

  .page-about .about-spread--flip .about-spread__media {
    grid-column: 1 / span 4;
  }

  .page-about .about-gen__track {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: clamp(20px, 3vw, 44px);
  }

  .page-about .about-gen__node {
    padding: 30px 0 0;
    background-size: 100% 1px;
    background-position: 0 0;
  }

  .page-about .about-gen__node:last-child {
    padding-bottom: 0;
    background-image: linear-gradient(90deg, var(--rule), transparent);
  }

  .page-about .about-gen__node::before {
    left: 0;
    top: -4px;
  }

  .page-about .about-source__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: clamp(32px, 5vw, 80px);
  }

  .page-about .about-source__body {
    grid-column: 1 / span 7;
  }

  .page-about .about-source__side {
    grid-column: 9 / span 4;
  }

  .page-about .about-scale__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__intro {
    margin-top: 72px;
  }

  .page-about .about-tasks__item {
    padding-left: 72px;
  }
}
<<<END>>>