.page-about {
  --about-rail: 96px;
  background: var(--black);
  color: var(--bone);
  font-family: var(--font-sans);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(112px, 18vw, 172px) 0 40px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 80% at 88% 0%, rgba(251, 9, 11, .16) 0%, rgba(10, 10, 10, 0) 62%),
    var(--black);
}

.page-about .about-hero__inner {
  position: relative;
}

.page-about .about-hero__spine {
  display: none;
}

.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 22px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
}

.page-about .about-crumb a {
  color: var(--mist);
  text-decoration: none;
  transition: color .14s var(--ease);
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--fluoro);
}

.page-about .about-hero__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--red);
}

.page-about .about-hero__title {
  margin: 18px 0 0;
  font-size: clamp(34px, 9.2vw, 86px);
  line-height: 1.04;
  font-weight: 900;
  letter-spacing: -.03em;
  text-wrap: balance;
}

.page-about .about-hero__lede {
  max-width: 46ch;
  margin: 24px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

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

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 44px 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--line);
  overflow: hidden;
}

.page-about .about-figure {
  background: var(--black);
  padding: 18px 16px;
}

.page-about .about-figure__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 6vw, 38px);
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--bone);
}

.page-about .about-figure__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--mist);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: 68px 0;
  border-bottom: 1px solid var(--line);
}

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

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

.page-about .about-rail {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-rail__num {
  color: var(--mist);
  transition: color .2s var(--ease);
}

.page-about .about-chapter.is-active .about-rail__num {
  color: var(--fluoro);
}

.page-about .about-rail__line {
  display: none;
}

.page-about .about-chapter__title {
  margin: 0;
  font-size: clamp(25px, 5.6vw, 44px);
  line-height: 1.14;
  font-weight: 800;
  letter-spacing: -.02em;
  text-wrap: balance;
}

.page-about .about-chapter__lede {
  max-width: 40ch;
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 起点 ---------- */
.page-about .about-origin__cards {
  display: grid;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-origin__card {
  padding: var(--pad-card);
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--carbon);
}

.page-about .about-origin__idx {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--fluoro);
}

.page-about .about-origin__card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.35;
  font-weight: 700;
}

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

.page-about .about-callout {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 18px;
  margin-top: 28px;
  padding: 22px var(--pad-card);
  border-radius: 4px;
  background: var(--red);
  color: var(--bone);
}

.page-about .about-callout__num {
  font-family: var(--font-mono);
  font-size: clamp(38px, 9vw, 62px);
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
}

.page-about .about-callout__text {
  flex: 1 1 240px;
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
}

/* ---------- 图 ---------- */
.page-about .about-media {
  margin: 30px 0 0;
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
  background: var(--carbon);
}

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

.page-about .about-media figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 团队表 ---------- */
.page-about .about-tablewrap {
  margin-top: 28px;
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .about-table__caption {
  padding: 14px 18px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist);
  border-bottom: 1px solid var(--line);
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 16px 18px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
  line-height: 1.65;
}

.page-about .about-table thead th {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist);
  background: var(--graphite);
}

.page-about .about-table tbody th {
  font-weight: 700;
  white-space: nowrap;
}

.page-about .about-table tbody td {
  color: var(--mist);
}

.page-about .about-table__num {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--fluoro) !important;
  white-space: nowrap;
}

.page-about .about-table tbody tr:last-child th,
.page-about .about-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .about-table tbody tr {
  transition: background-color .14s var(--ease), color .14s var(--ease);
}

@media (hover: hover) {
  .page-about .about-table tbody tr:hover {
    background: var(--bone);
  }

  .page-about .about-table tbody tr:hover th,
  .page-about .about-table tbody tr:hover td {
    color: var(--black);
  }

  .page-about .about-table tbody tr:hover .about-table__num {
    color: var(--red);
  }
}

/* ---------- 流程节点 ---------- */
.page-about .about-flow__nodes {
  display: grid;
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-node {
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--carbon);
}

.page-about .about-node summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}

.page-about .about-node summary::-webkit-details-marker {
  display: none;
}

.page-about .about-node summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--fluoro);
}

.page-about .about-node[open] summary::after {
  content: "–";
  color: var(--red);
}

.page-about .about-node summary:focus-visible {
  outline: 1px solid var(--fluoro);
  outline-offset: -2px;
}

.page-about .about-node p {
  margin: 0 20px 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 34px 0 0;
  padding: 0 0 0 20px;
  list-style: none;
  border-left: 1px solid var(--line);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 28px 18px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--black);
  border: 1px solid var(--line);
}

.page-about .about-timeline__item:last-child::before {
  background: var(--fluoro);
  border-color: var(--fluoro);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .16em;
  font-variant-numeric: tabular-nums;
  color: var(--mist);
}

.page-about .about-timeline__item:last-child .about-timeline__year {
  color: var(--fluoro);
}

.page-about .about-timeline__title {
  margin: 8px 0 6px;
  font-size: 16px;
  line-height: 1.4;
  font-weight: 700;
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 42ch;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 内容标准 ---------- */
.page-about .about-standards {
  margin-top: 30px;
}

.page-about .about-standard {
  border: 1px solid var(--line);
  border-radius: 4px;
}

.page-about .about-standard .card__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--fluoro);
  margin: 0 0 10px;
}

.page-about .about-standard .card__title {
  margin: 0 0 10px;
  font-size: 19px;
  line-height: 1.35;
  font-weight: 700;
}

.page-about .about-standard .card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 共建入口 ---------- */
.page-about .about-ways {
  display: grid;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-way {
  display: block;
  padding: var(--pad-card);
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--carbon);
  color: inherit;
  text-decoration: none;
  transition: background-color .14s var(--ease), border-color .14s var(--ease), color .14s var(--ease);
}

.page-about .about-way__tag {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--red);
  transition: color .14s var(--ease);
}

.page-about .about-way h3 {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.35;
  font-weight: 700;
}

.page-about .about-way p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
  transition: color .14s var(--ease);
}

.page-about .about-way:hover,
.page-about .about-way:focus-visible {
  background: var(--bone);
  border-color: var(--bone);
  color: var(--black);
}

.page-about .about-way:hover p,
.page-about .about-way:focus-visible p {
  color: rgba(10, 10, 10, .72);
}

.page-about .about-way:hover .about-way__tag,
.page-about .about-way:focus-visible .about-way__tag {
  color: var(--red-deep);
}

/* ---------- 入场 ---------- */
.page-about [data-reveal] {
  opacity: 1;
}

.has-js .page-about [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
}

.has-js .page-about [data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
  transition: opacity .28s var(--ease), transform .28s var(--ease);
}

@media (prefers-reduced-motion: reduce) {
  .has-js .page-about [data-reveal] {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 700px) {
  .page-about .about-origin__cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-figure {
    padding: 22px 20px;
  }

  .page-about .about-flow__nodes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-chapter {
    padding: 104px 0;
  }

  .page-about .about-chapter__inner {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h, 64px) + 44px);
    align-self: start;
    flex-direction: column;
    align-items: center;
    gap: 0;
    padding-top: 4px;
  }

  .page-about .about-rail__num {
    writing-mode: vertical-rl;
    letter-spacing: .26em;
    font-size: 12px;
  }

  .page-about .about-rail__line {
    display: block;
    width: 1px;
    height: 72px;
    margin: 14px 0;
    background: var(--line);
  }

  .page-about .about-rail__tag {
    writing-mode: vertical-rl;
    letter-spacing: .22em;
  }

  .page-about .about-hero {
    padding-bottom: 56px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__spine {
    display: block;
    position: absolute;
    right: max(24px, 3vw);
    top: 168px;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: .3em;
    color: var(--mist);
  }
}