.page-about {
  --about-rail: 240px;
  --about-gap: 40px;
  display: block;
  background: var(--c-ink);
  color: var(--c-bone);
  padding-bottom: 120px;
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--c-ink);
  padding: calc(var(--header-h) + 20px) 0 46px;
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.page-about .about-hero__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.26;
}

.page-about .about-hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(11, 29, 24, 0.52) 0%,
    rgba(11, 29, 24, 0.88) 58%,
    var(--c-ink) 100%
  );
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: 26px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-hero__rail {
  padding: 18px 18px 20px;
  border-left: 2px solid var(--c-signal);
  background: linear-gradient(90deg, rgba(61, 242, 182, 0.09), rgba(61, 242, 182, 0) 72%);
}

.page-about .about-facts {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-facts__item {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-facts__num {
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 1;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--c-bone);
  min-width: 62px;
}

.page-about .about-facts__num--signal {
  color: var(--c-signal);
}

.page-about .about-facts__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--c-mist);
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(34px, 8.4vw, 62px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--c-bone);
  max-width: 17ch;
}

.page-about .about-hero__lede {
  max-width: 58ch;
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: 54px 0;
}

.page-about .about-section--alt {
  background: var(--c-ink-2);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .split {
  display: grid;
  gap: 24px;
}

.page-about .split__rail .eyebrow {
  margin-bottom: 10px;
}

.page-about .split__body .section-title {
  margin-bottom: 20px;
  max-width: 24ch;
}

.page-about .split__rail .annotation {
  margin: 0;
  max-width: 26ch;
}

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

.page-about .split__body > p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--c-bone-soft);
  max-width: 62ch;
}

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

/* ---------- 图片件 ---------- */
.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure__media {
  position: relative;
  overflow: hidden;
  background: var(--c-slate);
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - var(--cut)),
    calc(100% - var(--cut)) 100%,
    0 100%
  );
}

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

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-mist);
}

.page-about .about-figure--band {
  margin-top: 40px;
}

.page-about .about-figure--band .about-figure__media img {
  max-height: 320px;
}

/* ---------- 团队分工条带 ---------- */
.page-about .crew {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .crew__row {
  padding: 14px 16px 16px;
  background: rgba(30, 42, 46, 0.62);
  border-left: 2px solid var(--line-strong);
  transition: border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-about .crew__row:hover,
.page-about .crew__row:focus-within {
  border-left-color: var(--c-signal);
  background: rgba(30, 42, 46, 0.94);
  outline: none;
}

.page-about .crew__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}

.page-about .crew__name {
  font-size: 16px;
  color: var(--c-bone);
}

.page-about .crew__count {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--c-signal);
  white-space: nowrap;
}

.page-about .crew__track {
  margin-top: 10px;
  height: 6px;
  background: rgba(159, 176, 168, 0.14);
  overflow: hidden;
}

.page-about .crew__fill {
  display: block;
  height: 100%;
}

.page-about .crew__fill--a {
  width: 39%;
  background: var(--c-signal);
}

.page-about .crew__fill--b {
  width: 22%;
  background: var(--c-signal-deep);
}

.page-about .crew__fill--c {
  width: 18%;
  background: var(--c-violet);
}

.page-about .crew__fill--d {
  width: 14%;
  background: rgba(159, 176, 168, 0.66);
}

.page-about .crew__fill--e {
  width: 7%;
  background: rgba(159, 176, 168, 0.36);
}

.page-about .crew__tip {
  margin: 11px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--c-mist);
  max-width: 52ch;
}

/* ---------- 覆盖数字 ---------- */
.page-about .coverage-figures {
  list-style: none;
  margin: 0 0 26px;
  padding: 18px 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 18px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .coverage-figures__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .coverage-figures__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 5vw, 36px);
  line-height: 1;
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--c-signal);
}

.page-about .coverage-figures__item:nth-child(3) .coverage-figures__num {
  font-size: clamp(22px, 4vw, 30px);
  color: var(--c-violet);
}

.page-about .coverage-figures__label {
  font-size: 13px;
  color: var(--c-mist);
}

/* ---------- 更新节奏 ---------- */
.page-about .cadence {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .cadence__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .cadence__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-signal);
  padding-top: 5px;
}

.page-about .cadence__text h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--c-bone);
}

.page-about .cadence__text p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--c-bone-soft);
  max-width: 58ch;
}

/* ---------- 版本时间线 ---------- */
.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 20px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: repeating-linear-gradient(
    180deg,
    rgba(61, 242, 182, 0.55) 0 7px,
    rgba(61, 242, 182, 0) 7px 15px
  );
}

.page-about .timeline__item {
  position: relative;
  margin-left: 0;
}

.page-about .timeline__node > summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 4px;
  cursor: pointer;
  list-style: none;
  transition: color 0.2s var(--ease);
}

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

.page-about .timeline__node > summary::marker {
  content: "";
}

.page-about .timeline__node > summary:hover .timeline__name,
.page-about .timeline__node[open] > summary .timeline__name {
  color: var(--c-signal);
}

.page-about .timeline__dot {
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--c-ink-2);
  border: 2px solid var(--c-signal);
  transition: background-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .timeline__node[open] .timeline__dot {
  background: var(--c-signal);
  box-shadow: 0 0 0 5px rgba(61, 242, 182, 0.14);
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--c-mist);
  min-width: 44px;
}

.page-about .timeline__name {
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--c-bone);
  transition: color 0.2s var(--ease);
}

.page-about .timeline__body {
  padding: 0 4px 18px 26px;
}

.page-about .timeline__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-bone-soft);
  max-width: 58ch;
  border-left: 1px solid var(--line);
  padding-left: 14px;
}

/* ---------- 合作与本地服务 ---------- */
.page-about .partners {
  display: grid;
  gap: 18px;
  margin-top: 26px;
}

.page-about .partners__card {
  padding: 20px 20px 22px;
  background: rgba(30, 42, 46, 0.6);
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - var(--cut-sm)),
    calc(100% - var(--cut-sm)) 100%,
    0 100%
  );
}

.page-about .partners__card--soft {
  background: rgba(18, 42, 36, 0.78);
}

.page-about .partners__card .card-title {
  margin: 0 0 14px;
}

.page-about .partners__card p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--c-bone-soft);
}

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

.page-about .partners__list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-bone-soft);
}

.page-about .partners__num {
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1.2;
  font-weight: 600;
  color: var(--c-signal);
  min-width: 34px;
}

.page-about .partners__card .tag-row {
  margin-top: 4px;
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(18, 42, 36, 0.55), rgba(11, 29, 24, 0) 70%);
}

.page-about .about-cta__inner {
  max-width: 720px;
}

.page-about .about-cta__inner .eyebrow {
  margin-bottom: 12px;
}

.page-about .about-cta__inner .section-title {
  margin-bottom: 16px;
  max-width: 22ch;
}

.page-about .about-cta__inner .lede {
  margin: 0 0 24px;
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 32px) 0 64px;
  }

  .page-about .about-section {
    padding: 68px 0;
  }

  .page-about .about-figure--band .about-figure__media img {
    max-height: 420px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 48px) 0 88px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }

  .page-about .split {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .split--media {
    grid-template-columns: minmax(250px, 320px) minmax(0, 1fr);
  }

  .page-about .split__media .about-figure__media {
    aspect-ratio: 4 / 3;
  }

  .page-about .split__media .about-figure__media img {
    height: 100%;
  }

  .page-about .about-section {
    padding: 90px 0;
  }

  .page-about .partners {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 22px;
  }

  .page-about .timeline__item:nth-child(2) {
    margin-left: 18px;
  }

  .page-about .timeline__item:nth-child(3) {
    margin-left: 36px;
  }

  .page-about .timeline__item:nth-child(4) {
    margin-left: 54px;
  }
}

@media (hover: hover) and (pointer: fine) and (min-width: 900px) {
  .page-about .crew__tip {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.32s var(--ease), opacity 0.32s var(--ease), margin-top 0.32s var(--ease);
  }

  .page-about .crew__row:hover .crew__tip,
  .page-about .crew__row:focus-within .crew__tip {
    max-height: 5em;
    margin-top: 11px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .crew__row,
  .page-about .crew__tip,
  .page-about .timeline__dot,
  .page-about .timeline__name {
    transition: none;
  }
}