.page-about {
  --about-rail: 190px;
  --about-measure: 76ch;
  background: var(--cream);
  color: var(--ink);
}

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

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

.page-about .about-crumb {
  padding-top: clamp(14px, 2.4vw, 24px);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: clamp(10px, 2vw, 18px);
  padding: clamp(28px, 5.4vw, 62px) 0 clamp(30px, 5.4vw, 66px);
  background: var(--carbon);
  color: var(--on-dark);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(158deg, rgba(255, 90, 31, 0.18), transparent 46%),
    radial-gradient(120% 90% at 100% 0%, rgba(124, 147, 168, 0.14), transparent 60%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 9px;
  background-image: repeating-linear-gradient(90deg, var(--line-dark) 0 1px, transparent 1px 16px);
  pointer-events: none;
}

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

.page-about .about-hero h1 {
  margin: clamp(12px, 2vw, 20px) 0 0;
  max-width: 20ch;
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(34px, 6vw, 76px);
  line-height: 0.98;
  letter-spacing: -0.015em;
  color: var(--on-dark);
}

.page-about .about-hero__lede {
  margin-top: clamp(16px, 2.6vw, 24px);
  max-width: 62ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.8;
  color: var(--on-dark-soft);
}

.page-about .about-hero__meta {
  list-style: none;
  margin: clamp(24px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line-dark);
}

.page-about .about-hero__meta li {
  padding: 13px 10px 13px 0;
  border-bottom: 1px solid var(--line-dark);
  min-width: 0;
}

.page-about .about-hero__meta li:nth-child(2n) {
  padding-left: 14px;
  border-left: 1px solid var(--line-dark);
}

.page-about .about-hero__meta b {
  display: block;
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1;
  color: var(--on-dark);
}

.page-about .about-hero__meta span {
  display: block;
  margin-top: 6px;
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--on-dark-soft);
}

/* ---------- 画册式双栏 ---------- */
.page-about .about-doc {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 5vw, 52px);
  padding-block: var(--sect);
}

.page-about .about-rail {
  border-left: 1px solid var(--line-light);
  padding-left: 14px;
}

.page-about .about-rail__title {
  margin: 0;
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: var(--steel-deep);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 2px 16px;
}

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 2px 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-rail__list a .mono {
  font-size: 11px;
  color: var(--steel);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--lava-deep);
  border-bottom-color: var(--lava);
}

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

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding-block: clamp(30px, 5vw, 62px);
  border-top: 1px solid var(--line-light);
  scroll-margin-top: calc(var(--bar-h) + 24px);
}

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

.page-about .about-sec__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(12px, 3vw, 26px);
  align-items: start;
  margin-bottom: clamp(16px, 3vw, 28px);
}

.page-about .chap-no {
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(38px, 7vw, 76px);
  line-height: 0.78;
  letter-spacing: -0.02em;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--lava);
}

@supports not (-webkit-text-stroke: 1px #000) {
  .page-about .chap-no {
    color: var(--lava);
  }
}

.page-about .about-sec h2 {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(24px, 4vw, 42px);
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-sec__kicker {
  margin: 10px 0 0;
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--steel-deep);
}

.page-about .about-sec__body {
  max-width: var(--about-measure);
}

.page-about .about-sec__body p {
  margin: 0 0 1em;
  font-size: clamp(15px, 1.6vw, 16.5px);
  line-height: 1.82;
  color: var(--ink-soft);
}

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

/* ---------- 图片框 ---------- */
.page-about .about-fig {
  margin: clamp(18px, 3vw, 28px) 0 0;
  border: 1px solid var(--line-light);
  background: var(--paper);
  box-shadow: var(--shadow);
}

.page-about .about-fig img {
  width: 100%;
  object-fit: cover;
}

.page-about .about-fig--narrow {
  max-width: 640px;
}

.page-about .about-fig .img-frame__cap {
  display: block;
  padding: 9px 12px;
  border-top: 1px solid var(--line-light);
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--steel-deep);
}

/* ---------- 四条内容线 ---------- */
.page-about .about-lines {
  list-style: none;
  margin: clamp(16px, 2.6vw, 24px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-light);
  border: 1px solid var(--line-light);
}

.page-about .about-line {
  min-width: 0;
  padding: clamp(15px, 2.4vw, 24px);
  background: var(--cream);
  display: grid;
  gap: 7px;
  align-content: start;
}

.page-about .about-line__no {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--lava);
}

.page-about .about-line__title {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(20px, 2.6vw, 26px);
  line-height: 1.1;
  color: var(--ink);
}

.page-about .about-line__meta {
  margin: 0 !important;
  font-family: var(--f-mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--steel-deep);
  background: rgba(197, 210, 220, 0.32);
  padding: 5px 8px;
  border-left: 2px solid var(--steel);
}

.page-about .about-line__desc {
  margin: 0 !important;
  font-size: 14.5px !important;
  line-height: 1.75 !important;
}

.page-about .about-line__use {
  margin: 4px 0 0 !important;
  padding-left: 10px;
  border-left: 2px solid var(--lava);
  font-size: 13.5px !important;
  line-height: 1.7 !important;
  color: var(--ink) !important;
}

/* ---------- 团队与筛选 ---------- */
.page-about .team-filter {
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .team-filter .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.page-about .team-filter .filter-btn {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  padding: 7px 13px;
  border: 1px solid var(--line-light);
  border-radius: var(--r);
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .team-filter .filter-btn:hover {
  border-color: var(--lava);
  color: var(--ink);
}

.page-about .team-filter .filter-btn.is-active,
.page-about .team-filter .filter-btn[aria-pressed="true"] {
  background: var(--lava);
  border-color: var(--lava);
  color: var(--carbon);
  font-weight: 700;
}

.page-about .team-filter .filter-count {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--steel-deep);
  margin-left: 2px;
}

.page-about .team-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .team-card {
  min-width: 0;
  padding: clamp(14px, 2vw, 20px);
  border: 1px solid var(--line-light);
  border-radius: var(--r);
  background: var(--paper);
  display: grid;
  gap: 6px;
  align-content: start;
}

.page-about .team-card__count {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 800;
  font-size: 26px;
  line-height: 1;
  color: var(--lava-deep);
}

.page-about .team-card__role {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.2;
  color: var(--ink);
}

.page-about .team-card__desc {
  margin: 0 !important;
  font-size: 13.8px !important;
  line-height: 1.75 !important;
}

/* ---------- 折叠流程 ---------- */
.page-about .about-flow {
  margin-top: clamp(16px, 2.6vw, 24px);
  border: 1px solid var(--line-light);
  background: var(--cream);
  border-radius: var(--r);
}

.page-about .about-flow summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  cursor: pointer;
  list-style: none;
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--ink);
}

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

.page-about .about-flow summary::after {
  content: "+";
  font-family: var(--f-mono);
  font-size: 16px;
  color: var(--lava);
}

.page-about .about-flow[open] summary::after {
  content: "–";
}

.page-about .about-flow[open] summary {
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-flow__steps {
  list-style: none;
  margin: 0;
  padding: 12px 14px 14px;
  display: grid;
  gap: 10px;
}

.page-about .about-flow__steps li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px;
  font-size: 13.8px;
  line-height: 1.72;
  color: var(--ink-soft);
}

.page-about .about-flow__steps .mono {
  font-size: 11px;
  color: var(--lava-deep);
  padding-top: 2px;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(16px, 2.6vw, 26px) 0 0;
  padding: 0 0 0 18px;
  border-left: 1px solid var(--line-light);
  display: grid;
  gap: clamp(14px, 2.4vw, 24px);
}

.page-about .about-timeline li {
  position: relative;
  min-width: 0;
}

.page-about .about-timeline li::before {
  content: "";
  position: absolute;
  left: calc(-18px - 4px);
  top: 7px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--lava);
  box-shadow: 0 0 0 3px var(--cream);
}

.page-about .about-timeline li:last-child::before {
  background: var(--lime);
}

.page-about .about-timeline__year {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--steel-deep);
}

.page-about .about-timeline h3 {
  margin: 5px 0 6px;
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(18px, 2.3vw, 23px);
  line-height: 1.15;
  color: var(--ink);
}

.page-about .about-timeline p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-soft);
}

/* ---------- 合作与认可 ---------- */
.page-about .partner-list {
  list-style: none;
  margin: clamp(16px, 2.6vw, 24px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .partner-list li {
  min-width: 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.page-about .partner-list__k {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--lava-deep);
}

.page-about .partner-list p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-soft);
}

/* ---------- 数据边注 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: clamp(16px, 2.6vw, 26px) 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-light);
  border: 1px solid var(--line-light);
}

.page-about .about-stat {
  min-width: 0;
  padding: clamp(16px, 2.4vw, 26px);
  background: var(--paper);
}

.page-about .about-stat__num {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(34px, 6vw, 58px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--carbon);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__num em {
  font-style: normal;
  color: var(--lava);
}

.page-about .about-stat__num--lime {
  color: var(--steel-deep);
}

.page-about .about-stat__num--lime em {
  color: var(--lava-deep);
}

.page-about .about-stat__label {
  display: block;
  margin: 9px 0 0;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--steel-deep);
}

/* ---------- 收束入口 ---------- */
.page-about .about-cta {
  position: relative;
  margin-top: clamp(30px, 5vw, 56px);
  padding: clamp(22px, 4vw, 40px);
  background: var(--carbon);
  color: var(--on-dark);
  border-radius: var(--r);
  overflow: hidden;
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 68px;
  height: 3px;
  background: var(--lava);
}

.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(24px, 4vw, 38px);
  line-height: 1.05;
  color: var(--on-dark);
}

.page-about .about-cta__links {
  list-style: none;
  margin: clamp(14px, 2.4vw, 22px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-dark);
  border-top: 1px solid var(--line-dark);
}

.page-about .about-cta__links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 6px;
  background: var(--carbon);
  color: var(--on-dark);
  text-decoration: none;
  font-family: var(--f-display);
  font-weight: 700;
  font-size: clamp(15px, 2vw, 19px);
  line-height: 1.3;
  transition: color 0.2s var(--ease), padding-left 0.2s var(--ease);
}

.page-about .about-cta__links a .mono {
  flex: none;
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--lava);
}

.page-about .about-cta__links a:hover,
.page-about .about-cta__links a:focus-visible {
  color: var(--lime);
  padding-left: 12px;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-lines {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .partner-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

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

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

  .page-about .about-hero__meta li {
    border-bottom: 0;
    padding: 15px 16px 0 0;
  }

  .page-about .about-hero__meta li:nth-child(2n) {
    padding-left: 0;
    border-left: 0;
  }

  .page-about .about-hero__meta li + li {
    border-left: 1px solid var(--line-dark);
    padding-left: 16px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-doc {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(40px, 6vw, 84px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--bar-h) + 28px);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 1px;
  }

  .page-about .about-rail__list li {
    border-bottom: 1px solid var(--line-light);
  }

  .page-about .about-rail__list li:last-child {
    border-bottom: 0;
  }

  .page-about .about-rail__list a {
    display: flex;
    padding: 7px 0;
  }

  .page-about .about-cta__links a {
    padding: 15px 6px;
  }
}
<<<END>>>