.page-about {
  --about-mark: 28px;
  --about-gap: 16px;
  --about-line: rgba(20, 23, 26, 0.18);
}

@media (min-width: 720px) {
  .page-about {
    --about-mark: 36px;
    --about-gap: 28px;
  }
}

/* ---------- 首屏：左侧叙事 + 右侧深墨绿数据面板 ---------- */
.page-about .about-hero {
  padding-block: clamp(28px, 5vw, 56px) clamp(20px, 3vw, 36px);
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  max-width: 16em;
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: clamp(17px, 1.4vw, 19px);
  line-height: 1.75;
  color: var(--black);
}

.page-about .about-hero__note {
  margin: 14px 0 0;
  max-width: 34em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--gray);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-invert);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px;
  background-color: var(--ink);
  background-image:
    linear-gradient(rgba(251, 253, 251, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(251, 253, 251, 0.025) 1px, transparent 1px);
  background-size: 12px 12px;
  color: var(--mist);
}

.page-about .about-stat__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(251, 253, 251, 0.66);
}

.page-about .about-stat__val {
  font-size: clamp(17px, 1.8vw, 21px);
  font-weight: 700;
  color: var(--mist);
}

/* ---------- 纵向轨迹骨架 ---------- */
.page-about .about-track {
  position: relative;
  padding-bottom: clamp(20px, 3vw, 40px);
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: calc(var(--about-mark) / 2);
  top: 32px;
  bottom: 32px;
  width: 0;
  border-left: 1px dashed var(--about-line);
  pointer-events: none;
}

.page-about .about-node {
  display: grid;
  grid-template-columns: var(--about-mark) minmax(0, 1fr);
  gap: var(--about-gap);
  padding-block: clamp(34px, 5.5vw, 68px);
  position: relative;
}

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

.page-about .about-node__idx {
  display: grid;
  place-items: center;
  width: var(--about-mark);
  height: var(--about-mark);
  background: var(--ink);
  color: var(--mist);
  font-size: 12px;
  letter-spacing: 0.04em;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut-sm)), calc(100% - var(--cut-sm)) 100%, 0 100%);
}

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

.page-about .about-node__body h2 {
  margin: 12px 0 0;
}

.page-about .about-node__body .prose {
  margin-top: 16px;
  max-width: 34em;
}

.page-about .about-node__body .prose p + p {
  margin-top: 1em;
}

/* ---------- 采编链路：四步流程 ---------- */
.page-about .about-node__body--split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
}

@media (min-width: 1024px) {
  .page-about .about-node__body--split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

.page-about .about-flow {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-flow__step {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0 16px 4px;
  border-bottom: 1px solid var(--line-soft);
  transition: background-color var(--step) var(--ease);
}

.page-about .about-flow__step:hover,
.page-about .about-flow__step:focus-within {
  background-color: var(--paper-2);
}

.page-about .about-flow__step:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 2px;
}

.page-about .about-flow__num {
  font-size: 13px;
  color: var(--orange);
  padding-top: 3px;
}

.page-about .about-flow__title {
  margin: 0;
  font-size: 1rem;
}

.page-about .about-flow__title::before {
  content: "";
  display: inline-block;
  width: 14px;
  height: 2px;
  margin-right: 8px;
  vertical-align: 0.28em;
  background: var(--blue);
}

.page-about .about-flow__note {
  margin: 6px 0 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--black);
}

.page-about .about-flow__extra {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin: 0;
  max-width: 34em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--gray);
  transition: max-height var(--step) var(--ease), opacity var(--step) var(--ease), margin-top var(--step) var(--ease);
}

.page-about .about-flow__step:hover .about-flow__extra,
.page-about .about-flow__step:focus-within .about-flow__extra {
  max-height: 6em;
  opacity: 1;
  margin-top: 8px;
}

.page-about .about-node__figure {
  margin: 0;
}

.page-about .about-node__figure .img-frame__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--gray);
}

/* ---------- 校正机制：两段并置 ---------- */
.page-about .about-correction {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.5vw, 28px);
  margin-top: 24px;
}

@media (min-width: 768px) {
  .page-about .about-correction {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-correction__lane {
  padding: 22px 22px 24px;
  background: var(--paper-2);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-about .about-correction__lane p {
  margin-top: 12px;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--black);
}

.page-about .about-correction__lane p + p {
  margin-top: 10px;
  color: var(--gray);
  font-size: 14px;
}

/* ---------- 团队面板 ---------- */
.page-about .about-team {
  margin-top: 26px;
  padding: 24px 22px 26px;
  background-color: var(--ink-deep);
  background-image:
    linear-gradient(rgba(251, 253, 251, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(251, 253, 251, 0.03) 1px, transparent 1px);
  background-size: 16px 16px;
  color: var(--mist);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-about .about-team__bars {
  display: grid;
  gap: 22px;
}

.page-about .about-bar__head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 10px;
}

.page-about .about-bar__label {
  font-size: 15px;
  color: var(--mist);
}

.page-about .about-bar__val {
  font-size: 15px;
  color: var(--orange);
}

.page-about .about-team .meter {
  background: rgba(251, 253, 251, 0.16);
}

.page-about .about-team__foot {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line-invert);
  font-size: 13px;
  letter-spacing: 0.03em;
  color: rgba(251, 253, 251, 0.72);
}

.page-about .about-team__figure {
  grid-column: 1 / -1;
  margin: clamp(22px, 3vw, 34px) 0 0;
}

.page-about .about-team__figure .img-frame__caption,
.page-about .about-cycle__figure .img-frame__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--gray);
}

/* ---------- 迭代节奏 ---------- */
.page-about .about-cycles {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-cycles__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
}

@media (min-width: 720px) {
  .page-about .about-cycles__item {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 22px;
    align-items: baseline;
  }
}

.page-about .about-cycles__phase {
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--ink);
}

.page-about .about-cycles__item p {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--black);
}

.page-about .about-cycle__figure {
  grid-column: 1 / -1;
  margin: clamp(24px, 3vw, 36px) 0 0;
}

/* ---------- 收尾 ---------- */
.page-about .about-outro {
  padding-block: clamp(40px, 6vw, 76px) clamp(24px, 3vw, 40px);
}

.page-about .about-outro__lead {
  margin-top: 16px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--black);
}

.page-about .about-outro__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-watch {
  margin-top: clamp(28px, 4vw, 44px);
  padding: 22px 24px;
  display: grid;
  gap: 16px;
  background: var(--paper-2);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-about .about-watch p {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--black);
}

.page-about .about-watch .star {
  justify-self: start;
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-flow__step,
  .page-about .about-flow__extra {
    transition: none;
  }

  .page-about .about-flow__extra {
    max-height: none;
    opacity: 1;
    margin-top: 8px;
  }
}
</main>