.page-about {
  --about-gap: clamp(52px, 8vw, 96px);
  --about-rule: 1px solid var(--paper-2);
  --about-title: var(--indigo);
}

.page-about .breadcrumb {
  margin: 18px 0 20px;
}

/* ---------- 封面 ---------- */
.page-about .about-cover__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  padding-bottom: 30px;
  border-bottom: 2px solid var(--indigo);
}

.page-about .about-cover__note {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .28em;
  color: var(--mist);
  margin: 0;
}

.page-about .about-cover__title {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(30px, 6.4vw, 60px);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--about-title);
  margin: 0;
  max-width: 15em;
}

.page-about .about-cover__lede {
  font-size: 17px;
  line-height: 1.8;
  color: var(--ink);
  margin: 0;
  max-width: 34em;
}

.page-about .about-cover__facts {
  list-style: none;
  margin: 10px 0 0;
  padding: 14px 0 0;
  border-top: var(--about-rule);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
  gap: 12px 18px;
  max-width: 640px;
}

.page-about .about-cover__facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .about-cover__num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.6vw, 28px);
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--ochre);
}

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

.page-about .shot .media {
  border: 1px solid var(--indigo);
  overflow: hidden;
  background: var(--paper-2);
}

.page-about .shot--8x3 .media { aspect-ratio: 8 / 3; }
.page-about .shot--3x2 .media { aspect-ratio: 3 / 2; }
.page-about .shot--1x1 .media { aspect-ratio: 1 / 1; }

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

.page-about .about-banner {
  margin: 26px 0 0;
}

.page-about .about-banner .media__caption {
  margin-top: 8px;
  font-size: 13px;
  color: var(--mist);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding-top: var(--about-gap);
}

.page-about .about-section .section-head {
  margin-bottom: 16px;
}

.page-about .about-section__lede {
  max-width: 34em;
  font-size: 17px;
  line-height: 1.8;
  color: var(--ink);
  margin: 0;
}

.page-about .about-section a {
  color: var(--indigo-2);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  text-decoration-color: var(--electric);
}

.page-about .about-section a:hover {
  color: var(--ochre);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  --tl-pad: 30px;
  --tl-axis: 8px;
  list-style: none;
  margin: 26px 0 0;
  padding: 4px 0 0 var(--tl-pad);
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: var(--tl-axis);
  top: 10px;
  bottom: 14px;
  width: 2px;
  background: var(--indigo-2);
}

.page-about .tl-node {
  position: relative;
  padding-bottom: 26px;
}

.page-about .tl-node:last-child {
  padding-bottom: 0;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: calc(var(--tl-axis) - 6px - var(--tl-pad));
  top: 7px;
  width: 10px;
  height: 10px;
  background: var(--yellow);
  border: 2px solid var(--indigo);
}

.page-about .tl-node--service::before {
  background: var(--turquoise);
  border-color: var(--turquoise);
  border-radius: 50%;
}

.page-about .tl-node__body {
  max-width: 34em;
}

.page-about .tl-node__date {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--ochre);
  margin: 0 0 4px;
}

.page-about .tl-node__title {
  font-size: clamp(19px, 3vw, 24px);
  font-weight: 800;
  line-height: 1.35;
  color: var(--indigo);
  margin: 0 0 6px;
}

.page-about .tl-node__text {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
  margin: 0;
}

.page-about .tl-node__more {
  margin: 8px 0 0;
  font-size: 14px;
}

.page-about .tl-node__more a {
  display: inline-block;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--electric);
  text-decoration: none;
}

/* ---------- 三件事 ---------- */
.page-about .principles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 22px;
}

.page-about .principle {
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--paper);
  border: 1px solid var(--indigo);
  border-top: 3px solid var(--ochre);
  padding: 22px 20px;
  box-shadow: 2px 2px 0 var(--indigo-2);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .principle:hover {
  transform: translateY(-2px);
  border-color: var(--electric);
  border-top-color: var(--ochre);
}

.page-about .principle__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--turquoise);
  margin: 0;
}

.page-about .principle__title {
  font-size: 19px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--indigo);
  margin: 0;
}

.page-about .principle__text {
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink);
  margin: 0;
}

.page-about .principle__list {
  list-style: none;
  margin: 4px 0 0;
  padding: 12px 0 0;
  border-top: var(--about-rule);
  display: grid;
  gap: 8px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .principle__list li {
  position: relative;
  padding-left: 16px;
}

.page-about .principle__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .76em;
  width: 8px;
  height: 1px;
  background: var(--ochre);
}

/* ---------- 团队 ---------- */
.page-about .team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 22px;
}

.page-about .team-card {
  position: relative;
  background: var(--paper-2);
  border: 1px solid var(--indigo);
  padding: 32px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .team-card::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 26px;
  height: 15px;
  background: var(--paper);
  border-right: 1px solid var(--indigo);
  border-bottom: 1px solid var(--indigo);
}

.page-about .team-card:hover,
.page-about .team-card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--electric);
}

.page-about .team-card__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--ochre);
  margin: 0;
}

.page-about .team-card__title {
  font-size: 18px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--indigo);
  margin: 0;
}

.page-about .team-card__text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
  margin: 0;
}

.page-about .team-card__duties {
  list-style: none;
  margin: 6px 0 0;
  padding: 10px 0 0;
  border-top: var(--about-rule);
  display: grid;
  gap: 6px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--mist);
}

@media (hover: hover) and (min-width: 760px) {
  .page-about .team-card__duties {
    max-height: 0;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
    overflow: hidden;
    opacity: 0;
    transition: max-height 180ms var(--ease), opacity 120ms var(--ease),
      margin-top 180ms var(--ease), padding-top 180ms var(--ease);
  }

  .page-about .team-card:hover .team-card__duties,
  .page-about .team-card:focus-visible .team-card__duties,
  .page-about .team-card:focus-within .team-card__duties {
    max-height: 220px;
    margin-top: 6px;
    padding-top: 10px;
    border-top-color: var(--paper);
    opacity: 1;
  }
}

/* ---------- 内容生产 ---------- */
.page-about .production {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  align-items: start;
  margin-top: 22px;
}

.page-about .production .media__caption {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .workflow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-about .workflow li {
  position: relative;
  padding: 16px 0 16px 46px;
  border-bottom: var(--about-rule);
}

.page-about .workflow li:first-child {
  border-top: 2px solid var(--indigo);
}

.page-about .workflow__num {
  position: absolute;
  left: 0;
  top: 17px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--ochre);
}

.page-about .workflow__title {
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--indigo);
  margin: 0 0 4px;
}

.page-about .workflow__text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
  margin: 0;
  max-width: 32em;
}

.page-about .production__more {
  margin-top: 20px;
  font-size: 15.5px;
}

/* ---------- 设计取向 ---------- */
.page-about .design {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  align-items: start;
  margin-top: 22px;
}

.page-about .design__text p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
  margin: 0 0 14px;
  max-width: 32em;
}

.page-about .design__notes {
  list-style: none;
  margin: 4px 0 0;
  padding: 14px 0 0;
  border-top: 2px solid var(--indigo);
  display: grid;
  gap: 9px;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .design__notes li {
  position: relative;
  padding-left: 18px;
}

.page-about .design__notes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55em;
  width: 10px;
  height: 3px;
  background: var(--yellow);
}

.page-about .design .media__caption {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 路线图 ---------- */
.page-about .roadmap {
  display: flex;
  gap: 14px;
  margin-top: 22px;
  padding: 4px 2px 16px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .roadmap::-webkit-scrollbar {
  height: 4px;
}

.page-about .roadmap::-webkit-scrollbar-thumb {
  background: var(--indigo-2);
}

.page-about .roadmap:focus-visible {
  outline: 3px solid var(--electric);
  outline-offset: 4px;
}

.page-about .roadmap__item {
  flex: 0 0 84%;
  scroll-snap-align: start;
  background: var(--paper-2);
  border-left: 3px solid var(--turquoise);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .roadmap__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--ochre);
  margin: 0;
}

.page-about .roadmap__title {
  font-size: 18px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--indigo);
  margin: 0;
}

.page-about .roadmap__text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
  margin: 0;
}

/* ---------- 收尾 ---------- */
.page-about .about-outro {
  padding-bottom: clamp(40px, 7vw, 80px);
}

.page-about .about-outro__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-outro__grid a {
  display: block;
  padding: 18px 16px;
  background: var(--paper);
  border: 1px solid var(--indigo);
  color: var(--indigo);
  font-weight: 700;
  font-size: 16px;
  text-decoration: none;
  box-shadow: 2px 2px 0 var(--indigo-2);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease),
    color var(--dur) var(--ease);
}

.page-about .about-outro__grid a:hover {
  transform: translateY(-2px);
  border-color: var(--electric);
  color: var(--ochre);
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .timeline {
    --tl-pad: 40px;
    --tl-axis: 12px;
  }

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

  .page-about .about-cover__grid {
    gap: 18px;
  }
}

@media (min-width: 760px) {
  .page-about .principles,
  .page-about .team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .roadmap__item {
    flex: 0 0 32%;
  }

  .page-about .about-outro__grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-cover__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    column-gap: 40px;
    align-items: start;
  }

  .page-about .about-cover__note {
    grid-column: 2;
    grid-row: 1;
    writing-mode: vertical-rl;
    letter-spacing: .3em;
    justify-self: end;
    margin-top: 6px;
  }

  .page-about .about-cover__title {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-cover__lede {
    grid-column: 1;
    grid-row: 2;
  }

  .page-about .about-cover__facts {
    grid-column: 1;
    grid-row: 3;
  }

  .page-about .production {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    column-gap: 40px;
  }

  .page-about .design {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    column-gap: 40px;
  }

  .page-about .tl-node:nth-child(3n + 2) .tl-node__body {
    padding-left: 26px;
  }

  .page-about .tl-node:nth-child(3n) .tl-node__body {
    padding-left: 52px;
  }

  .page-about .timeline {
    --tl-pad: 52px;
    --tl-axis: 14px;
    margin-top: 34px;
  }
}