.page-about {
  --about-line: rgba(110, 106, 99, 0.3);
  --about-index-w: 132px;
  background: var(--c-cream);
  color: var(--c-deep);
  font-family: var(--font-body);
  padding-bottom: clamp(48px, 8vw, 96px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
  padding-block: clamp(26px, 4vw, 52px) clamp(28px, 5vw, 60px);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero__title {
  margin: 14px 0 18px;
  max-width: 18ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--c-deep);
}

.page-about .about-hero__intro {
  max-width: 46ch;
  margin: 0;
  font-size: 17px;
  line-height: 1.85;
  color: var(--c-stone-ink);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 26px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding-left: 12px;
  border-left: 2px solid var(--c-clay);
  font-size: 14px;
  color: var(--c-stone-ink);
}

.page-about .about-hero__facts .mono {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--c-deep);
  font-variant-numeric: tabular-nums;
}

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

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

/* ---------- 运营阶段时间线 ---------- */
.page-about .about-phases {
  padding-block: clamp(28px, 4vw, 48px);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-timeline {
  display: flex;
  margin: 18px 0 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-timeline__item {
  position: relative;
  flex: 0 0 auto;
  width: min(232px, 68vw);
  padding: 24px 20px 8px 0;
  scroll-snap-align: start;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 5px;
  height: 1px;
  background: var(--c-terra);
  opacity: 0.5;
}

.page-about .about-timeline__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-cream);
  border: 2px solid var(--c-clay);
  transition: background 0.3s var(--ease-out), border-color 0.3s var(--ease-out);
}

.page-about .about-timeline__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-stone);
  font-variant-numeric: tabular-nums;
}

.page-about .about-timeline__year {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--c-deep);
  font-variant-numeric: tabular-nums;
}

.page-about .about-timeline__title {
  display: block;
  margin-top: 4px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--c-deep);
}

.page-about .about-timeline__note {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-stone-ink);
  opacity: 0.7;
  transform: translateY(4px);
  transition: opacity 0.3s var(--ease-out), transform 0.3s var(--ease-out);
}

.page-about .about-timeline__item:hover::after,
.page-about .about-timeline__item:focus-within::after {
  background: var(--c-gold);
  border-color: var(--c-lava);
}

.page-about .about-timeline__item:hover .about-timeline__note,
.page-about .about-timeline__item:focus-within .about-timeline__note {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 主体框架 ---------- */
.page-about .about-body {
  padding-block: clamp(8px, 1.5vw, 20px);
}

.page-about .about-index {
  padding-block: clamp(18px, 3vw, 30px);
}

.page-about .about-index__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-stone);
}

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

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-pill);
  font-size: 13px;
  white-space: nowrap;
  color: var(--c-stone-ink);
  text-decoration: none;
  transition: color 0.25s var(--ease-out), border-color 0.25s var(--ease-out), background 0.25s var(--ease-out);
}

.page-about .about-index__link .mono {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-clay);
  font-variant-numeric: tabular-nums;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--c-clay);
  background: rgba(210, 64, 30, 0.08);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding-block: clamp(30px, 4.5vw, 56px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-content > .about-chapter:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-chapter__title {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(21px, 2.6vw, 30px);
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--c-deep);
}

.page-about .about-chapter__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--c-frost);
  font-variant-numeric: tabular-nums;
  transition: color 0.5s var(--ease-out);
}

.page-about .about-chapter.is-visible .about-chapter__num {
  color: var(--c-clay);
}

.page-about .about-text {
  max-width: 64ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--c-stone-ink);
}

.page-about .about-text p {
  margin: 0;
}

.page-about .about-text p + p {
  margin-top: 16px;
}

.page-about .about-text a {
  color: var(--c-lava);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-figure {
  margin: 24px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
}

/* ---------- 深色数据切面 ---------- */
.page-about .about-chapter--dark.has-dark {
  margin-block: clamp(20px, 3vw, 36px);
  padding: clamp(26px, 4vw, 48px) clamp(18px, 3.5vw, 44px);
  border-top: 0;
  border-radius: var(--radius-lg);
  background: var(--c-deep);
  color: var(--c-mist);
}

.page-about .about-chapter--dark .about-chapter__title {
  color: var(--c-mist);
}

.page-about .about-chapter--dark .about-chapter__num {
  color: var(--c-terra);
}

.page-about .about-chapter--dark.is-visible .about-chapter__num {
  color: var(--c-gold);
}

.page-about .about-chapter--dark .about-text {
  color: rgba(255, 252, 246, 0.86);
}

.page-about .about-chapter--dark .about-text a {
  color: var(--c-gold);
}

.page-about .about-scale {
  display: grid;
  gap: 24px;
}

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

.page-about .about-chapter--dark .about-figure img {
  border: 1px solid rgba(242, 160, 61, 0.35);
}

.page-about .about-chapter--dark .about-text:last-child {
  margin-top: 24px;
}

.page-about .about-table-wrap {
  margin-top: 22px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-table {
  width: 100%;
  min-width: 430px;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
}

.page-about .about-table caption {
  padding-bottom: 10px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-gold);
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 11px 14px;
  border-bottom: 1px solid rgba(255, 252, 246, 0.12);
  text-align: right;
}

.page-about .about-table th:first-child,
.page-about .about-table td:first-child {
  text-align: left;
  font-family: var(--font-body);
}

.page-about .about-table thead th {
  border-bottom-color: rgba(242, 160, 61, 0.5);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--c-frost);
}

.page-about .about-table tbody tr:nth-child(even) {
  background: rgba(47, 107, 79, 0.32);
}

.page-about .about-table tbody tr:last-child td {
  border-bottom: 0;
  font-weight: 700;
  color: var(--c-gold);
}

.page-about .about-updates {
  display: grid;
  gap: 8px;
  max-width: 64ch;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-updates li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(255, 252, 246, 0.86);
}

.page-about .about-updates li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 9px;
  height: 2px;
  background: var(--c-gold);
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  margin: 22px 0 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-team__row {
  display: grid;
  gap: 6px 18px;
  padding: 16px 0 16px 16px;
  border-bottom: 1px solid var(--about-line);
  border-left: 2px solid var(--c-terra);
}

.page-about .about-team__role {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--c-deep);
}

.page-about .about-team__count {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--c-clay);
  font-variant-numeric: tabular-nums;
}

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

.page-about .about-team + .about-text {
  margin-top: 20px;
}

/* ---------- 复盘流程 ---------- */
.page-about .about-flow {
  counter-reset: step;
  display: grid;
  gap: 12px;
  max-width: 64ch;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow li {
  counter-increment: step;
  position: relative;
  padding: 14px 18px 14px 54px;
  border-radius: var(--radius-sm);
  background: rgba(180, 99, 58, 0.12);
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-stone-ink);
}

.page-about .about-flow li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 18px;
  top: 15px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-clay);
  font-variant-numeric: tabular-nums;
}

.page-about .about-flow + .about-text {
  margin-top: 20px;
}

/* ---------- 联络信息 ---------- */
.page-about .about-contact {
  max-width: 60ch;
  margin: 20px 0 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-contact > div {
  display: grid;
  grid-template-columns: 104px minmax(0, 1fr);
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-contact dt {
  font-size: 14px;
  color: var(--c-stone);
}

.page-about .about-contact dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  color: var(--c-deep);
  overflow-wrap: anywhere;
}

.page-about .about-contact + .about-text {
  margin-top: 20px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-team__row {
    grid-template-columns: 190px minmax(0, 1fr);
    align-items: baseline;
  }
}

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

  .page-about .about-body {
    display: grid;
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    gap: clamp(30px, 4vw, 72px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 28px;
    align-self: start;
    padding-block: clamp(30px, 4vw, 56px) 0;
  }

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

  .page-about .about-index__link {
    width: 100%;
    padding: 7px 0 7px 14px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    border-left-color: var(--c-clay);
    background: transparent;
  }
}

@media (min-width: 1100px) {
  .page-about .about-scale {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .about-scale__figure {
    margin-top: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__note {
    transform: none;
    transition: none;
  }

  .page-about .about-timeline__item::after,
  .page-about .about-chapter__num,
  .page-about .about-index__link {
    transition: none;
  }
}