.page-about {
  --about-ink: var(--rock);
  --about-soft: rgba(43, 47, 46, .68);
  color: var(--about-ink);
}

.page-about .breadcrumbs {
  padding-top: 20px;
}

/* 首屏：对角色块 + 米白纸面 */
.page-about .about-hero {
  display: grid;
  gap: 22px;
  padding-bottom: 8px;
}

.page-about .about-hero__cut {
  position: relative;
  padding: 34px 22px 46px;
  background-image: linear-gradient(152deg, var(--green) 0%, var(--green-deep) 100%);
  color: var(--paper);
  clip-path: polygon(0 0, 100% 0, 100% 92%, 0 100%);
}

.page-about .about-hero__title {
  margin: 14px 0 16px;
  font-size: clamp(30px, 8vw, 46px);
  line-height: 1.16;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 46ch;
  font-size: 17px;
  line-height: 1.75;
  color: rgba(244, 241, 232, .86);
}

.page-about .about-ver {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 26px;
  padding: 12px 14px;
  border: 1px solid rgba(201, 162, 39, .45);
  background: rgba(8, 38, 30, .5);
}

.page-about .about-ver__label {
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-ver__value {
  font-size: 26px;
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--gold);
}

.page-about .about-hero__paper {
  padding: 20px;
  background: var(--paper-card);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-1);
}

.page-about .about-hero__figure,
.page-about .about-cadence__figure,
.page-about .about-wide {
  margin: 0;
}

.page-about .about-hero__note {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-soft);
}

/* 通用小节引导文字 */
.page-about .about-intro {
  max-width: 60ch;
  margin: 12px 0 0;
}

/* 迭代历程：移动端纵向刻度，桌面端横向四列 */
.page-about .about-timeline {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 26px 24px;
  margin-left: 6px;
  border-left: 1px solid var(--line);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(201, 162, 39, .16);
}

.page-about .about-timeline__ver {
  display: inline-block;
  padding: 2px 9px;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--blue-ink);
  background: rgba(63, 169, 201, .14);
  border-radius: 2px;
}

.page-about .about-timeline__item .h3 {
  margin: 10px 0 8px;
}

.page-about .about-timeline__item p {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--about-soft);
}

/* 维护小组 */
.page-about .about-team {
  display: grid;
  gap: 18px;
  margin-top: 30px;
}

.page-about .about-team__card {
  padding: 22px;
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-top: 3px solid var(--moss);
  box-shadow: var(--shadow-1);
}

.page-about .about-team__role {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--fog);
}

.page-about .about-team__card .h3 {
  margin: 0 0 10px;
}

.page-about .about-team__card p:last-child {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--about-soft);
}

.page-about .about-steps {
  margin-top: 30px;
  padding: 22px;
  border: 1px dashed var(--line);
  background: linear-gradient(180deg, rgba(169, 195, 166, .12), transparent);
}

.page-about .about-steps__list {
  list-style: none;
  counter-reset: step;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-steps__list li {
  counter-increment: step;
  display: grid;
  grid-template-columns: 30px 1fr;
  align-items: baseline;
  gap: 10px;
  font-size: 16px;
  line-height: 1.65;
  color: var(--about-soft);
}

.page-about .about-steps__list li::before {
  content: counter(step, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--gold);
  letter-spacing: .06em;
}

/* 更新节奏：深色区块 */
.page-about .about-eyebrow--light {
  color: var(--gold);
}

.page-about .about-h2--light,
.page-about .about-h3--light {
  color: var(--paper);
}

.page-about .section--dark .about-h2--light {
  margin-top: 10px;
}

.page-about .about-cadence__lead {
  max-width: 54ch;
  margin: 12px 0 0;
  font-size: 17px;
  line-height: 1.75;
  color: rgba(244, 241, 232, .84);
}

.page-about .about-cadence__grid {
  display: grid;
  gap: 18px;
  margin-top: 28px;
}

.page-about .about-cadence__step {
  padding: 20px;
  border: 1px solid rgba(201, 162, 39, .35);
  background: rgba(8, 38, 30, .55);
}

.page-about .about-cadence__num {
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--gold);
}

.page-about .about-cadence__step .h3 {
  margin: 0 0 8px;
}

.page-about .about-cadence__step p:last-child {
  margin: 0;
  font-size: 16px;
  line-height: 1.72;
  color: rgba(244, 241, 232, .82);
}

.page-about .about-cadence__figure {
  margin-top: 30px;
}

.page-about .about-cadence__figure .media-frame__caption {
  color: rgba(244, 241, 232, .7);
}

/* 规模数据 */
.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 18px;
  margin-top: 30px;
}

.page-about .about-figure {
  padding-top: 12px;
  border-top: 2px solid var(--gold);
}

.page-about .about-figure__num {
  margin: 0;
  font-size: 30px;
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--green);
}

.page-about .about-figure__label {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--about-soft);
}

/* 备案与联系 */
.page-about .about-region {
  display: grid;
  gap: 18px;
  margin-top: 34px;
}

.page-about .about-region__card {
  padding: 20px;
  background: var(--paper-card);
  border-left: 3px solid var(--blue);
  border-top: 1px solid var(--line);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-region__card .h3 {
  margin: 0 0 8px;
}

.page-about .about-region__card p {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--about-soft);
  overflow-wrap: anywhere;
}

.page-about .about-wide {
  margin-top: 32px;
}

/* 结尾行动区 */
.page-about .about-cta {
  display: grid;
  gap: 20px;
  padding: 28px 22px;
  background-image: linear-gradient(140deg, var(--green) 0%, var(--green-deep) 100%);
  border-left: 4px solid var(--gold);
}

.page-about .about-cta__text .h2 {
  margin: 0 0 10px;
}

.page-about .about-cta__text p {
  margin: 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(244, 241, 232, .84);
}

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

/* 图片自适应 */
.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

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

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

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

  .page-about .about-cta {
    grid-template-columns: 1.4fr .6fr;
    align-items: center;
    padding: 34px 30px;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

/* 桌面端 */
@media (min-width: 980px) {
  .page-about .about-hero {
    grid-template-columns: 1.05fr .95fr;
    align-items: start;
    gap: 28px;
    padding-top: 34px;
  }

  .page-about .about-hero__cut {
    padding: 44px 32px 56px;
    clip-path: polygon(0 0, 100% 0, 92% 100%, 0 100%);
  }

  .page-about .about-hero__paper {
    padding: 26px;
    margin-top: 40px;
  }

  .page-about .about-timeline {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .about-timeline__item {
    margin: 0;
    padding: 24px 18px 0 0;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .page-about .about-timeline__item::before {
    left: 0;
    top: -5px;
  }

  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .about-team__card:nth-child(2) {
    margin-top: 30px;
  }

  .page-about .about-team__card:nth-child(3) {
    margin-top: 60px;
  }

  .page-about .about-steps {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 24px;
    align-items: start;
    padding: 26px;
  }

  .page-about .about-steps__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 26px;
  }

  .page-about .about-cadence {
    display: grid;
    grid-template-columns: .9fr 1.1fr;
    gap: 34px;
    align-items: start;
  }

  .page-about .about-cadence__grid {
    margin-top: 0;
    gap: 20px;
  }

  .page-about .about-cadence__figure {
    grid-column: 1 / -1;
    margin-top: 34px;
  }

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

  .page-about .about-region {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
    margin-top: 42px;
  }

  .page-about .about-wide {
    margin-top: 40px;
    display: grid;
    grid-template-columns: 1.2fr .8fr;
    gap: 26px;
    align-items: end;
  }

  .page-about .about-wide .media-frame__caption {
    max-width: 30ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    animation: none !important;
  }
}