.page-about {
  background: var(--ink);
  color: var(--paper-2);
  padding-bottom: 72px;
}

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

.page-about .media-frame img {
  width: 100%;
  object-fit: cover;
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding: 20px 0 0;
  font-size: 12px;
  color: var(--muted);
}

.page-about .breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

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

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

.page-about .section-title {
  margin: 12px 0 0;
  padding-left: 14px;
  border-left: 6px solid var(--orange);
  color: var(--paper);
  font-size: clamp(24px, 4.6vw, 38px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -.01em;
  transform: skewX(-2deg);
  transform-origin: left bottom;
}

.page-about .lede {
  margin-top: 16px;
  max-width: 36em;
  line-height: 1.85;
  color: var(--paper-2);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 30px 0 0;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  align-items: start;
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  padding-left: 16px;
  border-left: 6px solid var(--orange);
  color: var(--paper);
  font-size: clamp(30px, 6.2vw, 52px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -.015em;
  transform: skewX(-2deg);
  transform-origin: left bottom;
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 26px 0 0;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .hero-stats > div {
  background: var(--ink-panel);
  padding: 13px 14px 15px;
}

.page-about .hero-stats dt {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: .04em;
}

.page-about .hero-stats dd {
  margin: 6px 0 0;
  color: var(--cyan);
  font-size: clamp(22px, 4vw, 28px);
  font-weight: 800;
  line-height: 1;
}

.page-about .hero-stats sup {
  font-size: .55em;
  vertical-align: super;
}

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

.page-about .about-hero__stamp {
  position: absolute;
  right: 8px;
  top: 16px;
  writing-mode: vertical-rl;
  letter-spacing: .22em;
  font-size: 11px;
  color: var(--cyan);
  background: rgba(11, 43, 34, .82);
  border: 1px solid var(--line);
  padding: 10px 5px;
}

/* ---------- 品牌立场 ---------- */
.page-about .stance-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-top: 28px;
}

.page-about .stance-body p {
  margin: 0 0 16px;
  max-width: 36em;
  line-height: 1.9;
}

.page-about .stance-body p:last-child {
  margin-bottom: 0;
}

.page-about .stance-side {
  padding: 18px 20px 22px;
}

.page-about .stance-side__label {
  margin: 0 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
  color: var(--cyan);
  font-size: 11px;
  letter-spacing: .16em;
}

.page-about .stance-side__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .stance-side__list li {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  font-size: 13px;
  line-height: 1.65;
  color: var(--paper-2);
}

.page-about .stance-side__list .fig {
  color: var(--gold);
  font-size: 20px;
  font-weight: 800;
  line-height: 1;
}

/* ---------- 版本时间线 ---------- */
.page-about .about-timeline__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 32px;
}

.page-about .rail-title {
  margin: 0;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: .2em;
}

.page-about .year-scale {
  display: flex;
  gap: 8px;
  margin: 12px 0 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .year-scale a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 2px solid var(--line);
  background: var(--ink-panel);
  color: var(--paper-2);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: border-color .2s var(--ease), color .2s var(--ease), background .2s var(--ease);
}

.page-about .year-scale a:hover,
.page-about .year-scale a:focus-visible {
  border-color: var(--orange);
  color: var(--paper);
}

.page-about .year-scale__dot {
  width: 8px;
  height: 8px;
  flex: none;
  border-radius: 50%;
  background: var(--line);
  transition: background .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .year-scale a:hover .year-scale__dot,
.page-about .year-scale a:focus-visible .year-scale__dot {
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(242, 92, 5, .2);
}

.page-about .year-scale__num {
  font-weight: 800;
  color: var(--cyan);
}

.page-about .year-scale__label {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: .06em;
}

.page-about .tl-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  padding: 26px 0;
  border-top: 1px solid var(--line);
}

.page-about .tl-item:first-child {
  border-top: none;
  padding-top: 0;
}

.page-about .tl-item__year {
  display: block;
  color: var(--orange);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .16em;
}

.page-about .tl-item__title {
  margin: 10px 0 10px;
  color: var(--paper);
  font-size: clamp(19px, 3.2vw, 24px);
  font-weight: 800;
  line-height: 1.4;
}

.page-about .tl-item__main p {
  margin: 0;
  max-width: 34em;
  line-height: 1.85;
}

.page-about .tl-item__note {
  padding: 16px 18px 18px;
}

.page-about .tl-note-label {
  margin: 0 0 10px;
  padding-bottom: 7px;
  border-bottom: 1px solid var(--line);
  color: var(--cyan);
  font-size: 11px;
  letter-spacing: .14em;
}

.page-about .tl-item__note p:last-child {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--paper-2);
}

.page-about .tl-figure {
  margin: 26px 0 6px;
}

/* ---------- 团队 ---------- */
.page-about .about-team__intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-top: 26px;
}

.page-about .about-team__text p {
  margin: 0 0 16px;
  max-width: 36em;
  line-height: 1.85;
}

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

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

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 36px;
}

.page-about .team-card {
  position: relative;
  background: var(--paper);
  color: var(--char);
  border: 2px solid var(--ink-deep);
  border-top: 6px solid var(--orange);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, .34);
}

.page-about .team-card__summary {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) 22px;
  gap: 12px;
  align-items: start;
  padding: 18px 18px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .team-card__summary::-webkit-details-marker {
  display: none;
}

.page-about .team-card__num {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  background: var(--ink);
  color: var(--cyan);
  border: 2px solid var(--ink-deep);
  font-size: 15px;
  font-weight: 800;
}

.page-about .team-card__body {
  display: block;
  min-width: 0;
}

.page-about .team-card__role {
  display: block;
  font-size: 11px;
  letter-spacing: .12em;
  color: #6d7a74;
}

.page-about .team-card__title {
  display: block;
  margin-top: 6px;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--char);
}

.page-about .team-card__desc {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.7;
  color: #46514c;
}

.page-about .team-card__chev {
  width: 12px;
  height: 12px;
  margin-top: 12px;
  justify-self: center;
  border-right: 2px solid var(--char);
  border-bottom: 2px solid var(--char);
  transform: rotate(45deg);
  transition: transform .24s var(--ease);
}

.page-about .team-card[open] .team-card__chev {
  transform: rotate(-135deg);
}

.page-about .team-card__list {
  list-style: none;
  margin: 0 18px;
  padding: 4px 0 18px;
  border-top: 1px dashed rgba(26, 31, 29, .26);
}

.page-about .team-card__list li {
  position: relative;
  padding: 10px 0 10px 18px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--char);
  border-bottom: 1px solid rgba(26, 31, 29, .1);
}

.page-about .team-card__list li:last-child {
  border-bottom: none;
}

.page-about .team-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 8px;
  height: 2px;
  background: var(--orange);
}

/* ---------- 数据流程 ---------- */
.page-about .about-data {
  background: var(--ink-deep);
}

.page-about .data-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .data-step {
  position: relative;
  padding: 18px 16px 20px;
  background: var(--ink-panel);
  border: 2px solid var(--line);
}

.page-about .data-step__num {
  display: block;
  color: var(--gold);
  font-size: 22px;
  font-weight: 800;
  line-height: 1;
}

.page-about .data-step__title {
  margin: 12px 0 8px;
  color: var(--paper);
  font-size: 16px;
  font-weight: 800;
}

.page-about .data-step p {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--paper-2);
}

/* ---------- 长期运营 ---------- */
.page-about .commit-band {
  padding: 28px 20px 30px;
  border: 2px solid var(--line);
  border-left: 8px solid var(--orange);
  background: linear-gradient(135deg, var(--ink-panel) 0%, var(--ink) 72%);
}

.page-about .commit-band__head .section-title {
  margin-top: 10px;
}

.page-about .commit-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .commit-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 14px 16px;
  background: var(--ink);
}

.page-about .commit-list__k {
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .commit-list__v {
  font-size: 14px;
  line-height: 1.65;
  color: var(--paper);
}

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .commit-list li {
    grid-template-columns: 128px minmax(0, 1fr);
    align-items: baseline;
    gap: 14px;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.618fr) minmax(0, 1fr);
    gap: 44px;
    align-items: end;
  }

  .page-about .stance-grid {
    grid-template-columns: minmax(0, 1.618fr) minmax(0, 1fr);
    gap: 40px;
  }

  .page-about .about-team__intro {
    grid-template-columns: minmax(0, 1fr) minmax(0, .618fr);
    gap: 36px;
    align-items: center;
  }

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

  .page-about .team-card:nth-child(2) {
    margin-top: 32px;
  }

  .page-about .team-card:nth-child(3) {
    margin-top: 64px;
  }

  .page-about .data-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .commit-band {
    padding: 34px 36px 36px;
  }
}

@media (min-width: 980px) {
  .page-about .about-timeline__grid {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-timeline__rail {
    position: sticky;
    top: 28px;
  }

  .page-about .year-scale {
    flex-direction: column;
    gap: 2px;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-about .year-scale__dot {
    display: none;
  }

  .page-about .year-scale a {
    width: 100%;
    justify-content: flex-start;
    padding: 9px 0 9px 14px;
    border: none;
    border-left: 2px solid var(--line);
    background: transparent;
  }

  .page-about .year-scale a:hover,
  .page-about .year-scale a:focus-visible {
    border-left-color: var(--orange);
    background: linear-gradient(90deg, rgba(242, 92, 5, .16), transparent 82%);
  }

  .page-about .tl-item {
    grid-template-columns: minmax(0, 1fr) 236px;
    gap: 34px;
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .data-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .data-step:nth-child(2) {
    margin-top: 22px;
  }

  .page-about .data-step:nth-child(3) {
    margin-top: 44px;
  }

  .page-about .data-step:nth-child(4) {
    margin-top: 66px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}