.page-about {
  --about-rail-w: 236px;
  --about-col-gap: 56px;
  --about-line: rgba(42, 51, 70, .7);
  background: var(--obsidian);
  color: var(--ivory);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 26px 0 46px;
  background:
    radial-gradient(110% 82% at 84% -18%, rgba(53, 224, 210, .16), transparent 62%),
    radial-gradient(70% 62% at 6% 112%, rgba(232, 180, 74, .09), transparent 60%),
    linear-gradient(180deg, var(--navy) 0%, var(--navy-soft) 44%, var(--obsidian) 100%);
  border-bottom: 1px solid var(--rock);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  margin-top: 26px;
}

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

.page-about .about-hero-main h1 {
  margin: 12px 0 0;
  font-size: clamp(34px, 5.6vw, 56px);
  line-height: 1.14;
  letter-spacing: -.03em;
  font-weight: 700;
  color: var(--ivory);
  text-shadow: 0 0 26px rgba(53, 224, 210, .16);
}

.page-about .about-lede {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: rgba(242, 239, 232, .84);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--rock);
  border: 1px solid var(--rock);
  border-radius: var(--radius);
  overflow: hidden;
  align-self: start;
}

.page-about .fact {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px;
  background: rgba(14, 26, 51, .86);
  transition: background var(--dur) var(--ease);
}

.page-about .fact:hover {
  background: rgba(19, 31, 58, .96);
}

.page-about .fact-value {
  font-size: 26px;
  line-height: 1;
  font-weight: 600;
  letter-spacing: .03em;
  color: var(--gold);
}

.page-about .fact-label {
  font-size: var(--fs-micro);
  letter-spacing: .05em;
  color: var(--mist);
}

/* ---------- 主体分栏 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  padding-top: 42px;
  padding-bottom: 72px;
}

.page-about .about-rail-inner {
  display: grid;
  gap: 16px;
}

.page-about .rail-title {
  margin: 0;
  font-size: var(--fs-micro);
  letter-spacing: .16em;
  color: var(--mist);
}

.page-about .about-rail-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

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

.page-about .rail-link {
  display: block;
  padding: 8px 14px;
  border: 1px solid var(--rock);
  border-radius: 999px;
  font-size: var(--fs-small);
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--ivory);
  border-color: var(--cyan);
  background: rgba(53, 224, 210, .07);
}

.page-about .rail-note {
  padding: 15px 16px;
  border: 1px solid var(--rock);
  border-radius: var(--radius-s);
  background: rgba(14, 26, 51, .62);
}

.page-about .rail-note-title {
  margin: 0 0 7px;
  font-size: var(--fs-micro);
  letter-spacing: .12em;
  color: var(--gold);
}

.page-about .rail-note-text {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-articles {
  display: grid;
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding-bottom: 54px;
  margin-bottom: 54px;
  border-bottom: 1px solid var(--about-line);
  scroll-margin-top: calc(var(--header-h) + 26px);
}

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

.page-about .section-idx {
  margin: 0 0 10px;
  font-size: var(--fs-micro);
  letter-spacing: .2em;
  color: var(--cyan);
}

.page-about .about-h2 {
  margin: 0 0 20px;
  font-size: clamp(24px, 3.6vw, 32px);
  line-height: 1.3;
  letter-spacing: -.02em;
  font-weight: 700;
  color: var(--ivory);
}

.page-about .about-p {
  margin: 0 0 18px;
  max-width: 40em;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: rgba(242, 239, 232, .84);
}

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

.page-about .about-p a,
.page-about .stage-body a,
.page-about .about-inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 210, .34);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-p a:hover,
.page-about .stage-body a:hover,
.page-about .about-inline-link:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 图 ---------- */
.page-about .about-figure {
  margin: 26px 0 30px;
  border: 1px solid var(--rock);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--navy);
}

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

.page-about .about-figure .media-caption {
  margin: 0;
  padding: 12px 16px;
  border-top: 1px solid var(--rock);
  font-size: var(--fs-small);
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 阶段轴 SVG ---------- */
.page-about .about-axis {
  display: block;
  width: 100%;
  height: auto;
  margin: 6px 0 26px;
  overflow: visible;
}

.page-about .axis-tick line {
  stroke: var(--rock);
  stroke-width: 1;
}

.page-about .axis-tick circle {
  fill: var(--obsidian);
  stroke: var(--rock);
  stroke-width: 1.5;
}

.page-about .axis-tick--last circle {
  fill: var(--cyan);
  stroke: var(--cyan);
}

.page-about .axis-ver {
  fill: var(--gold);
  font-family: var(--font-mono);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: .06em;
}

.page-about .axis-name {
  fill: var(--mist);
  font-size: 21px;
  letter-spacing: .02em;
}

/* ---------- 阶段条目 ---------- */
.page-about .about-stages {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--rock);
  border: 1px solid var(--rock);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .stage {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 18px;
  background: var(--obsidian);
  transition: background var(--dur) var(--ease);
}

.page-about .stage:hover {
  background: rgba(14, 26, 51, .92);
}

.page-about .stage-no {
  padding-top: 3px;
  font-size: var(--fs-small);
  color: var(--cyan);
}

.page-about .stage-title {
  margin: 0 0 7px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1.45;
  color: var(--ivory);
}

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

.page-about .stage-body p {
  margin: 0;
  max-width: 38em;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 团队折叠卡 ---------- */
.page-about .about-teams {
  display: grid;
  gap: 10px;
  margin-top: 24px;
}

.page-about .about-team {
  border: 1px solid var(--rock);
  border-radius: var(--radius-s);
  background: rgba(14, 26, 51, .55);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-team:hover {
  border-color: rgba(53, 224, 210, .34);
}

.page-about .about-team[open] {
  border-color: rgba(53, 224, 210, .55);
  background: rgba(14, 26, 51, .78);
}

.page-about .about-team summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
  font-size: var(--fs-body);
  font-weight: 500;
  color: var(--ivory);
}

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

.page-about .about-team summary:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .team-meta {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.page-about .team-count {
  font-size: var(--fs-small);
  color: var(--gold);
}

.page-about .team-mark {
  position: relative;
  width: 12px;
  height: 12px;
  flex: 0 0 auto;
}

.page-about .team-mark::before,
.page-about .team-mark::after {
  content: "";
  position: absolute;
  background: var(--mist);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .team-mark::before {
  left: 0;
  top: 5px;
  width: 12px;
  height: 1.5px;
}

.page-about .team-mark::after {
  left: 5px;
  top: 0;
  width: 1.5px;
  height: 12px;
}

.page-about .about-team[open] .team-mark::before {
  background: var(--cyan);
}

.page-about .about-team[open] .team-mark::after {
  transform: scaleY(0);
}

.page-about .team-body {
  padding: 0 18px 18px;
}

.page-about .team-body p {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--about-line);
  max-width: 38em;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 企业上线流程 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 12px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow-step {
  position: relative;
  padding: 20px 18px 20px 24px;
  border: 1px solid var(--rock);
  border-radius: var(--radius-s);
  background: rgba(14, 26, 51, .5);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .flow-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 2px;
  border-radius: 2px;
  background: var(--rock);
  transition: background var(--dur) var(--ease);
}

.page-about .flow-step:hover,
.page-about .flow-step:focus-within {
  border-color: rgba(53, 224, 210, .5);
  background: rgba(53, 224, 210, .06);
  transform: translateY(-2px);
}

.page-about .flow-step:hover::before,
.page-about .flow-step:focus-within::before {
  background: var(--cyan);
}

.page-about .flow-step--key::before {
  background: var(--coral);
}

.page-about .flow-step--key:hover::before,
.page-about .flow-step--key:focus-within::before {
  background: var(--coral);
}

.page-about .flow-step--key .flow-num {
  color: var(--coral);
}

.page-about .flow-num {
  display: block;
  margin-bottom: 10px;
  font-size: var(--fs-micro);
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .flow-title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ivory);
}

.page-about .flow-step p {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 安全与品质 ---------- */
.page-about .about-checks {
  display: grid;
  gap: 14px;
  margin: 26px 0 24px;
  padding: 0;
  list-style: none;
}

.page-about .about-checks > li {
  padding: 18px 18px 18px 20px;
  border-left: 2px solid var(--moss);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  background: rgba(79, 107, 87, .1);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-checks > li:hover {
  background: rgba(79, 107, 87, .18);
  border-left-color: var(--cyan);
}

.page-about .check-title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ivory);
}

.page-about .about-checks p {
  margin: 0;
  max-width: 38em;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 生态数据 ---------- */
.page-about .about-eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 26px 0 24px;
}

.page-about .eco-item {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 22px 20px;
  border: 1px solid var(--rock);
  border-radius: var(--radius-s);
  background: linear-gradient(155deg, rgba(19, 31, 58, .95) 0%, rgba(7, 10, 18, .92) 100%);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .eco-item:hover {
  border-color: rgba(232, 180, 74, .45);
  transform: translateY(-3px);
}

.page-about .eco-value {
  font-size: 34px;
  line-height: 1;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-about .eco-item:nth-child(2) .eco-value {
  color: var(--gold);
}

.page-about .eco-item:nth-child(3) .eco-value {
  color: var(--coral);
}

.page-about .eco-label {
  font-size: var(--fs-small);
  color: var(--ivory);
}

.page-about .eco-tag {
  font-size: var(--fs-micro);
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-eco {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-hero {
    padding: 32px 0 58px;
  }
}

@media (min-width: 900px) {
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .flow-step {
    padding: 24px 20px 22px;
    border-radius: var(--radius-s);
  }

  .page-about .flow-step::before {
    top: auto;
    bottom: 0;
    left: 18px;
    right: 18px;
    width: auto;
    height: 2px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .82fr);
    gap: var(--about-col-gap);
    align-items: start;
  }

  .page-about .about-facts {
    margin-top: 8px;
  }

  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    column-gap: var(--about-col-gap);
    padding-top: 72px;
    padding-bottom: 112px;
  }

  .page-about .about-rail-inner {
    position: sticky;
    top: calc(var(--header-h) + 30px);
  }

  .page-about .about-rail-list {
    flex-direction: column;
    gap: 0;
    padding: 0;
    overflow: visible;
    border-left: 1px solid var(--rock);
  }

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

  .page-about .rail-link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    margin-left: -1px;
    padding: 10px 12px 10px 15px;
    white-space: normal;
  }

  .page-about .rail-link:hover,
  .page-about .rail-link:focus-visible {
    background: rgba(53, 224, 210, .05);
    border-left-color: var(--cyan);
  }

  .page-about .stage {
    gap: 22px;
    padding: 22px 22px;
  }

  .page-about .about-figure {
    margin: 30px 0 34px;
  }
}

@media (min-width: 1280px) {
  .page-about {
    --about-rail-w: 260px;
    --about-col-gap: 72px;
  }
}
<<<END>>>