.page-about {
  --about-gap: clamp(72px, 13vw, 168px);
  --about-num: clamp(52px, 12vw, 104px);
  position: relative;
  overflow-x: hidden;
  padding-bottom: clamp(56px, 10vw, 120px);
  background:
    radial-gradient(58% 34% at 8% 0%, rgba(0, 224, 198, .10), transparent 68%),
    radial-gradient(46% 30% at 96% 20%, rgba(255, 138, 61, .07), transparent 70%);
}

.page-about .about-top {
  padding-top: clamp(14px, 3vw, 26px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(26px, 6vw, 60px);
}

.page-about .about-hero__kicker {
  margin: 0 0 18px;
  color: var(--sb-muted);
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 22em;
  font-family: var(--sb-sans);
  font-size: clamp(30px, 6.2vw, 62px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--sb-text);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 48px);
  margin-top: clamp(26px, 5vw, 48px);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 40rem;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.85;
  color: var(--sb-text);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--sb-line);
  border: 1px solid var(--sb-line);
  border-radius: var(--sb-r);
  overflow: hidden;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: var(--sb-surface);
}

.page-about .about-stat__num {
  font-family: var(--sb-mono);
  font-size: clamp(22px, 3.6vw, 32px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--sb-cyan);
}

.page-about .about-stat__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--sb-muted);
}

/* ---------- 章节框架 ---------- */
.page-about .about-chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(10px, 2vw, 18px);
  margin-top: var(--about-gap);
}

.page-about .about-chapter__num {
  font-family: var(--sb-mono);
  font-size: var(--about-num);
  font-weight: 700;
  line-height: .84;
  letter-spacing: -.05em;
  color: var(--sb-cyan);
  opacity: .34;
  user-select: none;
  transition: opacity .45s var(--sb-ease), color .45s var(--sb-ease), text-shadow .45s var(--sb-ease);
}

.page-about .about-chapter.is-current .about-chapter__num {
  opacity: 1;
  color: var(--sb-cyan-soft);
  text-shadow: 0 0 36px rgba(0, 224, 198, .35);
}

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

.page-about .about-chapter__title {
  margin: 10px 0 0;
  font-family: var(--sb-sans);
  font-size: clamp(24px, 3.8vw, 40px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -.015em;
  color: var(--sb-text);
}

.page-about .about-prose {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 38em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--sb-text);
}

.page-about .about-prose--tight {
  margin-top: clamp(20px, 3vw, 30px);
  color: var(--sb-muted);
}

.page-about .about-prose a,
.page-about .about-promise__title + p a {
  color: var(--sb-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 224, 198, .4);
}

.page-about .about-prose a:hover,
.page-about .about-prose a:focus-visible {
  color: var(--sb-cyan-soft);
  border-bottom-color: var(--sb-cyan-soft);
}

/* ---------- 三项能力 ---------- */
.page-about .about-capabilities {
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--sb-line);
}

.page-about .about-capability {
  display: grid;
  gap: 8px;
  padding: clamp(18px, 2.8vw, 28px) 0;
  border-bottom: 1px solid var(--sb-line);
}

.page-about .about-capability__label {
  font-family: var(--sb-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--sb-cyan);
}

.page-about .about-capability__title {
  margin: 0;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 800;
  line-height: 1.45;
  color: var(--sb-text);
}

.page-about .about-capability p {
  margin: 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--sb-muted);
}

.page-about .about-leagues {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-leagues li {
  padding: 6px 12px;
  font-family: var(--sb-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--sb-cyan-soft);
  background: rgba(0, 224, 198, .05);
  border: 1px solid var(--sb-line);
  border-radius: var(--sb-pill);
}

/* ---------- 工序 ---------- */
.page-about .about-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--sb-line);
  border: 1px solid var(--sb-line);
  border-radius: var(--sb-r);
  overflow: hidden;
}

.page-about .about-flow__step {
  display: grid;
  gap: 9px;
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--sb-surface);
}

.page-about .about-flow__no {
  font-family: var(--sb-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--sb-orange);
}

.page-about .about-flow__title {
  margin: 0;
  font-size: clamp(17px, 1.9vw, 20px);
  font-weight: 800;
  color: var(--sb-text);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--sb-muted);
}

/* ---------- 团队 ---------- */
.page-about .about-team-bar {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: clamp(22px, 3.2vw, 32px);
  border-radius: var(--sb-r);
  overflow: hidden;
}

.page-about .about-team-seg {
  display: flex;
  flex-direction: row;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 18px;
  border-left: 3px solid var(--sb-cyan);
  background: rgba(19, 28, 46, .9);
  transition: background var(--sb-dur) var(--sb-ease), border-color var(--sb-dur) var(--sb-ease);
  cursor: default;
}

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

.page-about .about-team-seg--edit {
  border-left-color: var(--sb-cyan-soft);
  background: rgba(16, 24, 40, .9);
}

.page-about .about-team-seg--care {
  border-left-color: var(--sb-orange);
}

.page-about .about-team-seg--eng:hover,
.page-about .about-team-seg--eng:focus-visible {
  background: rgba(0, 224, 198, .14);
}

.page-about .about-team-seg--edit:hover,
.page-about .about-team-seg--edit:focus-visible {
  background: rgba(124, 246, 228, .12);
}

.page-about .about-team-seg--care:hover,
.page-about .about-team-seg--care:focus-visible {
  background: rgba(255, 138, 61, .14);
}

.page-about .about-team-seg__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--sb-text);
}

.page-about .about-team-seg__num {
  font-family: var(--sb-mono);
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 700;
  line-height: 1;
  color: var(--sb-text);
}

.page-about .about-team-seg__unit {
  margin-left: 3px;
  font-size: 12px;
  color: var(--sb-muted);
}

.page-about .about-team-seg__meta {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--sb-muted);
}

/* ---------- 图片通用 ---------- */
.page-about .about-figure {
  margin: clamp(28px, 4.4vw, 46px) 0 0;
}

.page-about .about-figure img,
.page-about .about-band img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--sb-r);
}

.page-about .about-band {
  display: block;
  width: min(100% - 2 * var(--sb-gutter), var(--sb-max));
  margin: var(--about-gap) auto 0;
}

.page-about .about-band img {
  border-radius: var(--sb-r-lg);
}

/* ---------- 版本线 ---------- */
.page-about .about-timeline-wrap {
  position: relative;
  margin-top: clamp(24px, 3.6vw, 40px);
  padding: clamp(20px, 3vw, 34px);
  border: 1px solid var(--sb-line);
  border-radius: var(--sb-r-lg);
  overflow: hidden;
}

.page-about .about-timeline-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.page-about .about-timeline-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .18;
}

.page-about .about-timeline {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 30px);
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 6px 14px;
  padding: 4px 0 0;
  border-radius: var(--sb-r-sm);
  transition: transform var(--sb-dur) var(--sb-ease);
}

.page-about .about-timeline__item:focus-visible {
  outline: 2px solid var(--sb-cyan);
  outline-offset: 6px;
}

.page-about .about-timeline__node {
  grid-row: 1 / -1;
  width: 14px;
  height: 14px;
  margin-top: 6px;
  border-radius: 50%;
  background: var(--sb-cyan);
  box-shadow: 0 0 0 5px rgba(0, 224, 198, .14);
}

.page-about .about-timeline__item--v3 .about-timeline__node {
  background: var(--sb-orange);
  box-shadow: 0 0 0 5px rgba(255, 138, 61, .18);
}

.page-about .about-timeline__tag {
  margin: 0;
  font-family: var(--sb-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--sb-cyan-soft);
}

.page-about .about-timeline__item--v3 .about-timeline__tag {
  color: var(--sb-orange-soft);
}

.page-about .about-timeline__title {
  grid-column: 2;
  margin: 0;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 800;
  line-height: 1.4;
  color: var(--sb-text);
}

.page-about .about-timeline__text {
  grid-column: 2;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--sb-muted);
}

.page-about .about-timeline__points {
  grid-column: 2;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline__points li {
  padding: 5px 10px;
  font-size: 12px;
  line-height: 1.4;
  color: var(--sb-text);
  background: rgba(0, 224, 198, .07);
  border: 1px solid var(--sb-line);
  border-radius: var(--sb-pill);
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-coverage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 46px);
  margin-top: clamp(14px, 2vw, 22px);
}

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

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

.page-about .about-map path {
  fill: rgba(0, 224, 198, .06);
  stroke: rgba(0, 224, 198, .34);
  stroke-width: 1.5;
}

.page-about .about-map__dot {
  fill: var(--sb-cyan);
  opacity: .85;
}

.page-about .about-map__dot--warm {
  fill: var(--sb-orange);
  opacity: 1;
}

.page-about .about-map__caption {
  margin: 10px 0 0;
  font-family: var(--sb-mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--sb-muted);
}

/* ---------- 合作与认可 ---------- */
.page-about .about-proof {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(22px, 3.2vw, 32px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--sb-line);
  border: 1px solid var(--sb-line);
  border-radius: var(--sb-r);
  overflow: hidden;
}

.page-about .about-proof__item {
  display: grid;
  gap: 8px;
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--sb-surface);
}

.page-about .about-proof__num {
  font-family: var(--sb-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--sb-orange);
}

.page-about .about-proof__label {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--sb-muted);
}

/* ---------- 承诺 ---------- */
.page-about .about-promise {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 26px);
  margin: clamp(22px, 3.2vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-promise__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding-left: 16px;
  border-left: 2px solid var(--sb-line);
}

.page-about .about-promise__no {
  font-family: var(--sb-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--sb-cyan);
  padding-top: 4px;
}

.page-about .about-promise__title {
  margin: 0;
  font-size: clamp(16px, 1.9vw, 19px);
  font-weight: 800;
  color: var(--sb-text);
}

.page-about .about-promise__title + p {
  margin: 8px 0 0;
  max-width: 36em;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--sb-muted);
}

/* ---------- 结尾转化 ---------- */
.page-about .about-cta {
  margin-top: var(--about-gap);
  padding: clamp(26px, 5vw, 56px);
  border: 1px solid var(--sb-line);
  border-radius: var(--sb-r-lg);
  background: linear-gradient(140deg, rgba(0, 224, 198, .14), rgba(255, 138, 61, .07) 58%, rgba(5, 7, 13, 0) 100%);
}

.page-about .about-cta__title {
  margin: 0;
  font-size: clamp(22px, 3.2vw, 34px);
  font-weight: 900;
  line-height: 1.25;
  color: var(--sb-text);
}

.page-about .about-cta__text {
  margin: 14px 0 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--sb-muted);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: end;
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-chapter {
    grid-template-columns: minmax(160px, 32%) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-chapter__body {
    max-width: 44rem;
  }

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

  .page-about .about-team-bar {
    flex-direction: row;
    gap: 4px;
  }

  .page-about .about-team-seg {
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-end;
    gap: 8px;
    min-height: 148px;
  }

  .page-about .about-team-seg__meta {
    margin-top: 2px;
  }

  .page-about .about-team-seg--eng {
    flex: 15 1 0;
  }

  .page-about .about-team-seg--edit {
    flex: 11 1 0;
  }

  .page-about .about-team-seg--care {
    flex: 8 1 0;
  }

  .page-about .about-feature-row {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(24px, 3vw, 42px);
  }

  .page-about .about-timeline__item {
    grid-template-columns: minmax(0, 1fr);
    padding: 30px 0 0;
    border-top: 1px solid var(--sb-line);
  }

  .page-about .about-timeline__item:hover,
  .page-about .about-timeline__item:focus-visible {
    transform: translateY(-4px);
  }

  .page-about .about-timeline__node {
    position: absolute;
    top: -8px;
    left: 0;
    margin: 0;
  }

  .page-about .about-timeline__title,
  .page-about .about-timeline__text,
  .page-about .about-timeline__points {
    grid-column: 1;
  }

  .page-about .about-coverage {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: center;
    gap: clamp(28px, 4vw, 56px);
  }

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

  .page-about .about-promise__item {
    padding-left: 22px;
  }
}