.page-about {
  --about-index-w: 208px;
  --about-line: 1px solid var(--graphite);
  --about-soft: rgba(143, 163, 154, .18);
  display: block;
  padding: 20px 0 72px;
  background: var(--ink);
  color: var(--fog);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 刊头 ---------- */
.page-about .about-masthead {
  display: grid;
  gap: 28px;
  padding: 24px 0 36px;
  border-bottom: var(--about-line);
}

.page-about .about-title {
  margin: 10px 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 7.2vw, 62px);
  line-height: 1.02;
  letter-spacing: -.025em;
  color: var(--fog);
}

.page-about .about-title span {
  color: var(--lime);
}

.page-about .about-lead {
  margin: 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-about .about-facts {
  margin: 0;
  border-top: var(--about-line);
}

.page-about .about-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 0;
  border-bottom: var(--about-line);
}

.page-about .about-facts dt {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--mist);
}

.page-about .about-facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  color: var(--lime);
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-shell {
  display: grid;
  gap: 34px;
  padding-top: 34px;
}

.page-about .about-index {
  border-left: 2px solid var(--pitch);
  padding-left: 14px;
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 15px;
  color: var(--mist);
  letter-spacing: .03em;
}

.page-about .about-index__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 3px 0;
  color: var(--fog);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-index__list .num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--graphite);
}

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

.page-about .about-index__list a:hover .num,
.page-about .about-index__list a:focus-visible .num {
  color: var(--lime);
}

.page-about .about-index__note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-index__note a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid var(--about-soft);
}

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

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding: 0 0 44px;
  margin-bottom: 40px;
  border-bottom: var(--about-line);
}

.page-about .about-sec:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 8px;
}

.page-about .about-sec__head {
  margin-bottom: 22px;
}

.page-about .about-sec__head h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 4.2vw, 33px);
  line-height: 1.18;
  letter-spacing: -.015em;
  color: var(--fog);
}

.page-about .about-p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--fog);
  max-width: 62ch;
}

.page-about .about-p--tight {
  margin-top: 20px;
  color: var(--mist);
  font-size: 15px;
}

/* ---------- 业务主张 ---------- */
.page-about .about-split {
  display: grid;
  gap: 26px;
}

.page-about .about-cards {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--graphite);
  border-top: var(--about-line);
  border-bottom: var(--about-line);
}

.page-about .about-cards li {
  background: var(--ink);
  padding: 16px 16px 18px;
  transition: background .2s var(--ease);
}

.page-about .about-cards li:hover {
  background: var(--pitch);
}

.page-about .about-cards h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--lime);
}

.page-about .about-cards p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-figure {
  margin: 0;
  aspect-ratio: 4 / 5;
  border: var(--about-line);
  position: relative;
}

.page-about .about-figure::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 46px;
  height: 3px;
  background: var(--lime);
}

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

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  padding: 10px 0;
  border-top: var(--about-line);
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
  z-index: 0;
  pointer-events: none;
}

.page-about .about-timeline__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .2;
  display: block;
}

.page-about .about-timeline__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--ink) 0%, rgba(7, 19, 15, .35) 45%, var(--ink) 100%);
}

.page-about .about-timeline > *:not(.about-timeline__bg) {
  position: relative;
  z-index: 1;
}

.page-about .stage {
  border-bottom: var(--about-line);
}

.page-about .stage:first-of-type {
  border-top: 0;
}

.page-about .stage__head {
  list-style: none;
  display: grid;
  grid-template-columns: 40px 1fr auto;
  align-items: baseline;
  gap: 12px;
  padding: 16px 0;
  cursor: pointer;
  transition: color .2s var(--ease);
}

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

.page-about .stage__head:hover .stage__name,
.page-about .stage__head:focus-visible .stage__name {
  color: var(--lime);
}

.page-about .stage__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mist);
  letter-spacing: .08em;
}

.page-about .stage__name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--fog);
  transition: color .2s var(--ease);
}

.page-about .stage__ver {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink);
  background: var(--lime);
  padding: 2px 6px;
  border-radius: var(--r);
}

.page-about .stage[open] .stage__num,
.page-about .stage[open] .stage__name {
  color: var(--lime);
}

.page-about .stage__body {
  padding: 0 0 18px 52px;
}

.page-about .stage__body p {
  margin: 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 团队条带 ---------- */
.page-about .team-band {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 6px;
}

.page-about .team-band__item {
  border: var(--about-line);
  background: var(--ink-2);
  padding: 18px 16px;
  transition: background .22s var(--ease), border-color .22s var(--ease);
}

.page-about .team-band__item:hover {
  background: var(--pitch);
  border-color: var(--lime);
}

.page-about .team-band__count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--lime);
  letter-spacing: -.02em;
}

.page-about .team-band__name {
  margin: 4px 0 8px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .team-band__note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 服务范围 ---------- */
.page-about .about-banner {
  margin: 0 0 22px;
  aspect-ratio: 3 / 2;
  border: var(--about-line);
}

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

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

.page-about .region-grid li {
  border: var(--about-line);
  padding: 7px 13px;
  font-size: 13.5px;
  letter-spacing: .02em;
  color: var(--mist);
  border-radius: var(--r);
}

.page-about .region-grid li.is-primary {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink);
  font-weight: 700;
}

/* ---------- 更新节奏 ---------- */
.page-about .rhythm {
  display: grid;
  gap: 1px;
  background: var(--graphite);
  border: var(--about-line);
}

.page-about .rhythm__cell {
  background: var(--ink-2);
  padding: 20px 18px;
}

.page-about .rhythm__time {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--orange);
}

.page-about .rhythm__title {
  margin: 6px 0 8px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .rhythm__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 合作理由 ---------- */
.page-about .why-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: why;
  display: grid;
  gap: 1px;
  background: var(--graphite);
  border-top: var(--about-line);
  border-bottom: var(--about-line);
}

.page-about .why-list li {
  counter-increment: why;
  background: var(--ink);
  padding: 20px 18px;
}

.page-about .why-list li::before {
  content: "0" counter(why);
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--lime);
  margin-bottom: 6px;
}

.page-about .why-list h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .why-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-cta {
  margin-top: 26px;
  border: var(--about-line);
  border-left: 3px solid var(--lime);
  background: var(--ink-2);
  padding: 22px 18px;
}

.page-about .about-cta h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .about-cta p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-cta a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 255, 61, .4);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .about-figure {
    margin-top: -14px;
  }

  .page-about .team-band {
    flex-direction: row;
    align-items: stretch;
  }

  .page-about .team-band__item--content {
    flex: 7 1 0;
  }

  .page-about .team-band__item--data {
    flex: 6 1 0;
  }

  .page-about .team-band__item--product {
    flex: 5 1 0;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-masthead {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: end;
    padding: 34px 0 44px;
  }

  .page-about .about-lead {
    font-size: 17px;
  }
}

@media (min-width: 1024px) {
  .page-about {
    padding: 32px 0 96px;
  }

  .page-about .about-shell {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    gap: 56px;
    padding-top: 44px;
  }

  .page-about .about-index {
    position: sticky;
    top: 32px;
    align-self: start;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 2px;
  }

  .page-about .about-index__list a {
    width: 100%;
    padding: 5px 0;
  }

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

  .page-about .stage__body {
    padding-left: 52px;
    padding-right: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__list a,
  .page-about .about-cards li,
  .page-about .team-band__item,
  .page-about .stage__name {
    transition: none;
  }
}