.page-about {
  --about-rail: 178px;
  --about-hair: rgba(22, 224, 200, 0.24);
  --about-hair-ink: rgba(11, 31, 23, 0.14);
}

.page-about .breadcrumbs {
  padding: clamp(14px, 2vw, 22px) 0 0;
}

.page-about .wrap {
  max-width: var(--wrap);
}

.page-about__shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 46px);
  padding-top: clamp(18px, 2.6vw, 34px);
}

.page-about__stream {
  display: grid;
  gap: clamp(48px, 6vw, 96px);
  min-width: 0;
}

.page-about__stream > * {
  min-width: 0;
}

/* ---------- 章节索引 ---------- */

.page-about__toc {
  position: sticky;
  top: var(--bar-h);
  z-index: 3;
  margin-top: -8px;
  padding: 10px 0 8px;
  background: linear-gradient(180deg, var(--pitch) 58%, rgba(11, 31, 23, 0) 100%);
}

.page-about__toc .label {
  display: none;
}

.page-about__toc .toc__list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: none;
}

.page-about__toc .toc__list::-webkit-scrollbar {
  display: none;
}

.page-about__toc .toc__link {
  flex: 0 0 auto;
  padding: 6px 11px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: rgba(18, 51, 38, 0.72);
  color: var(--steel);
  font-size: 12px;
  letter-spacing: 0.02em;
  white-space: nowrap;
  text-decoration: none;
  transition: color 220ms var(--ease), border-color 220ms var(--ease),
    background-color 220ms var(--ease);
}

.page-about__toc .toc__link:hover {
  color: var(--mist);
  border-color: var(--line-strong);
}

.page-about__toc .toc__link[aria-current="true"] {
  color: var(--pitch);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  background:
    radial-gradient(120% 96% at 80% 0%, rgba(22, 224, 200, 0.16), rgba(11, 31, 23, 0) 62%),
    var(--panel);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  align-items: start;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-size: clamp(28px, 4.6vw, 44px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: clamp(15px, 1.1vw, 17px);
  line-height: 1.8;
  color: var(--steel);
}

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

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

.page-about .about-hero__figure .figure__frame {
  aspect-ratio: 3 / 2;
}

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

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 14px;
  margin: 32px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.page-about .about-stats__item {
  display: grid;
  gap: 4px;
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.1vw, 27px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .about-stats__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--mute);
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline .panel__head {
  max-width: 62ch;
}

.page-about .timeline {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline__item {
  position: relative;
  padding-left: 30px;
  padding-bottom: 26px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan-deep);
  box-shadow: 0 0 0 4px rgba(15, 163, 143, 0.14);
}

.page-about .timeline__item:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 21px;
  bottom: 4px;
  width: 1px;
  background: var(--about-hair-ink);
}

.page-about .timeline__mark {
  display: inline-block;
  margin-bottom: 8px;
  padding: 2px 8px;
  border: 1px solid rgba(15, 163, 143, 0.38);
  border-radius: 2px;
  background: rgba(15, 163, 143, 0.08);
  color: var(--cyan-deep);
  font-size: 11px;
  letter-spacing: 0.06em;
}

.page-about .timeline__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: #0B1F17;
}

.page-about .timeline__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(11, 31, 23, 0.72);
}

/* ---------- 数据来路 ---------- */

.page-about .about-pipeline__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  margin-top: 28px;
}

.page-about .flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .flow__step {
  position: relative;
  padding: 16px 16px 18px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  border-radius: 3px;
  background: rgba(244, 247, 245, 0.03);
}

.page-about .flow__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .flow__step h3 {
  margin: 8px 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--mist);
}

.page-about .flow__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--steel);
}

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

.page-about .about-pipeline__figure .figure__frame {
  aspect-ratio: 3 / 2;
}

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

/* ---------- 团队与班次 ---------- */

.page-about .about-team .panel__head {
  max-width: 66ch;
}

.page-about .about-team .table-wrap {
  margin-top: 28px;
}

.page-about .shift-table tbody tr {
  transition: background-color 220ms var(--ease);
}

.page-about .shift-table tbody tr:hover,
.page-about .shift-table tbody tr:focus-within {
  background: rgba(15, 163, 143, 0.08);
}

.page-about .about-team__notes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-team__note {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 14px 16px;
  border: 1px solid var(--about-hair-ink);
  border-radius: 3px;
  background: rgba(11, 31, 23, 0.035);
}

.page-about .about-team__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--cyan-deep);
}

.page-about .about-team__note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(11, 31, 23, 0.74);
}

/* ---------- 合作与认可 ---------- */

.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 28px;
}

.page-about .about-partners__grid .card {
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-about .about-partners__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.5vw, 32px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .about-partners__grid .card__meta {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--steel);
}

/* ---------- 版本节奏 ---------- */

.page-about .about-roadmap__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  margin-top: 28px;
}

.page-about .version-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .version-card {
  padding: 18px 18px 20px;
  border: 1px solid var(--about-hair-ink);
  border-radius: 3px;
  background: rgba(11, 31, 23, 0.035);
}

.page-about .version-card--now {
  border-color: rgba(15, 163, 143, 0.45);
  background: rgba(15, 163, 143, 0.08);
}

.page-about .version-card__ver {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 2px;
  background: rgba(11, 31, 23, 0.09);
  color: rgba(11, 31, 23, 0.74);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.page-about .version-card--now .version-card__ver {
  background: var(--cyan-deep);
  color: var(--mist);
}

.page-about .version-card__title {
  margin: 12px 0 8px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  color: #0B1F17;
}

.page-about .version-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(11, 31, 23, 0.7);
}

.page-about .roadmap-figure {
  margin: 0;
}

.page-about .roadmap-figure .figure__frame {
  aspect-ratio: 8 / 5;
}

.page-about .roadmap-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .roadmap-chart {
  display: block;
  width: 100%;
  max-width: 400px;
  height: auto;
  margin: 34px auto 0;
}

.page-about .roadmap-chart__axis {
  stroke: rgba(11, 31, 23, 0.2);
  stroke-width: 1;
}

.page-about .roadmap-chart__bar--old {
  fill: rgba(11, 31, 23, 0.16);
}

.page-about .roadmap-chart__bar--new {
  fill: var(--cyan-deep);
}

.page-about .roadmap-chart__label {
  font-family: var(--font-mono);
  font-size: 13px;
  fill: rgba(11, 31, 23, 0.58);
}

.page-about .roadmap-chart__value {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  fill: rgba(11, 31, 23, 0.58);
}

.page-about .roadmap-chart__value--new {
  fill: var(--cyan-deep);
}

.page-about .roadmap-next {
  margin-top: 34px;
  padding-top: 24px;
  border-top: 1px solid var(--about-hair-ink);
}

.page-about .roadmap-next__title {
  margin: 0 0 14px;
  font-size: 17px;
  font-weight: 700;
  color: #0B1F17;
}

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

.page-about .roadmap-next__list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(11, 31, 23, 0.74);
}

.page-about .roadmap-next__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 9px;
  height: 2px;
  background: var(--cyan-deep);
}

.page-about .roadmap-next__list strong {
  font-weight: 700;
  color: #0B1F17;
}

.page-about .roadmap-next__foot {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(11, 31, 23, 0.66);
}

.page-about .roadmap-next__foot a {
  color: var(--cyan-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 断点 ---------- */

@media (min-width: 620px) {
  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

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

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

@media (min-width: 960px) {
  .page-about .about-pipeline__grid,
  .page-about .about-roadmap__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

@media (min-width: 1180px) {
  .page-about__shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(30px, 3.2vw, 54px);
  }

  .page-about__toc {
    position: sticky;
    top: calc(var(--bar-h) + 28px);
    align-self: start;
    margin-top: 0;
    padding: 0;
    background: none;
  }

  .page-about__toc .label {
    display: block;
    margin-bottom: 12px;
    color: var(--mute);
  }

  .page-about__toc .toc__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about__toc .toc__link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: none;
    padding: 9px 12px;
    margin-left: -1px;
    font-size: 13px;
    color: var(--steel);
  }

  .page-about__toc .toc__link:hover {
    color: var(--mist);
  }

  .page-about__toc .toc__link[aria-current="true"] {
    border: 0;
    border-left: 2px solid var(--cyan);
    background: none;
    color: var(--cyan);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .toc__link,
  .page-about .shift-table tbody tr {
    transition: none;
  }
}