.page-about {
  --about-rail: 180px;
  --about-sticky: 96px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: 28px 56px;
  border-bottom: var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -18%;
  width: 620px;
  height: 620px;
  background: radial-gradient(circle at center, rgba(40, 240, 255, 0.09), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-size: clamp(32px, 6.2vw, 64px);
  line-height: 1.04;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lede {
  margin-top: 20px;
}

.page-about .about-hero__panel {
  padding: 20px;
  border-top: 2px solid var(--cyan);
}

.page-about .about-hero__panel-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ink-soft);
}

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

.page-about .about-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--grid);
}

.page-about .about-facts__row:last-child {
  border-bottom: 0;
}

.page-about .about-facts__label {
  font-size: 13px;
  color: var(--ink-soft);
}

.page-about .about-facts__value {
  margin: 0;
  font-size: 15px;
  color: var(--ink);
  text-align: right;
}

/* ---------- 通用章节骨架 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .about-split__rail {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(40px, 8vw, 76px);
  line-height: 0.86;
  letter-spacing: 0.02em;
  color: transparent;
  -webkit-text-stroke: 1px var(--grid);
}

.page-about .about-note {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--ink-soft);
}

.page-about .about-tag {
  display: inline-block;
  padding: 3px 9px;
  background: var(--cream);
  color: #1d1408;
  font-size: 11px;
  letter-spacing: 0.12em;
  border-radius: 2px;
}

.page-about .about-h2 {
  margin: 0 0 18px;
  font-size: clamp(26px, 4vw, 40px);
  line-height: 1.12;
  letter-spacing: -0.01em;
}

.page-about .about-p {
  margin: 0 0 16px;
  max-width: 62ch;
  color: var(--ink-soft);
  line-height: 1.75;
}

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

.page-about .about-p .num {
  color: var(--ink);
}

.page-about .about-inline-link {
  display: inline-block;
  padding-bottom: 3px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(40, 240, 255, 0.4);
  transition: border-color var(--speed), color var(--speed);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--cyan);
}

.page-about .about-link-row {
  margin: 20px 0 0;
  font-size: 14px;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  position: relative;
  margin: 24px 0 0;
  overflow: hidden;
}

.page-about .about-figure .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  transition: transform 0.4s ease, filter 0.4s ease;
}

.page-about .about-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid transparent;
  pointer-events: none;
  transition: border-color var(--speed);
}

.page-about .about-figure:hover .media-frame__img,
.page-about .about-figure:focus-within .media-frame__img {
  transform: scale(1.02);
  filter: saturate(1.08);
}

.page-about .about-figure:hover::after,
.page-about .about-figure:focus-within::after {
  border-color: var(--cyan);
}

.page-about .about-figure .media-frame__caption {
  transition: color var(--speed);
}

.page-about .about-figure:hover .media-frame__caption {
  color: var(--cyan);
}

/* ---------- 五类栏目 ---------- */
.page-about .about-columns {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  border-top: var(--line);
}

.page-about .about-columns__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 18px 10px 18px 0;
  border-bottom: var(--line);
  transition: background var(--speed), padding-left var(--speed);
}

.page-about .about-columns__item:hover {
  background: rgba(40, 240, 255, 0.045);
  padding-left: 10px;
}

.page-about .about-columns__idx {
  font-size: 13px;
  line-height: 1.9;
  color: var(--cyan);
}

.page-about .about-columns__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.page-about .about-columns__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- 数据运营 ---------- */
.page-about .about-pair {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
}

.page-about .about-pair__media {
  margin-top: 20px;
}

.page-about .about-checklist {
  list-style: none;
  margin: 20px 0 20px;
  padding: 0;
  border-left: 1px solid var(--grid);
}

.page-about .about-checklist li {
  position: relative;
  padding: 0 0 14px 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

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

.page-about .about-checklist li::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 9px;
  width: 7px;
  height: 7px;
  background: var(--orange);
  transform: rotate(45deg);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 28px 0 0;
  padding: 0 0 0 24px;
  border-left: 1px solid var(--grid);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 30px;
  outline: none;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 8px;
  width: 11px;
  height: 11px;
  background: var(--bg);
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
  transition: background var(--speed), box-shadow var(--speed);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-visible::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(40, 240, 255, 0.14);
}

.page-about .about-timeline__item:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 6px;
}

.page-about .about-timeline__year {
  display: block;
  font-size: 26px;
  line-height: 1;
  color: var(--cream);
  letter-spacing: 0.04em;
}

.page-about .about-timeline__title {
  margin: 10px 0 6px;
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--ink);
}

.page-about .about-timeline__desc {
  margin: 0;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .about-timeline__tip {
  margin: 12px 0 0;
  padding: 8px 12px;
  border-left: 2px solid var(--grid);
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-soft);
  opacity: 0.72;
  transition: opacity var(--speed), border-color var(--speed), transform var(--speed);
}

.page-about .about-timeline__item:hover .about-timeline__tip,
.page-about .about-timeline__item:focus-visible .about-timeline__tip {
  opacity: 1;
  border-left-color: var(--cyan);
  transform: translateX(4px);
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 24px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

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

.page-about .about-team__kicker {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- 访问体验 ---------- */
.page-about .about-reach__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 24px 0;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .about-reach__item {
  padding: 18px 14px;
  background: var(--bg-mid);
}

.page-about .about-reach__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.4vw, 28px);
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-reach__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

/* ---------- 下一步 ---------- */
.page-about .about-next-section {
  padding-bottom: 64px;
}

.page-about .about-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-next__link {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 4px 16px;
  padding: 20px 20px 20px 24px;
  background: var(--panel);
  color: var(--ink);
  text-decoration: none;
  border-left: 2px solid var(--grid);
  transition: border-color var(--speed), background var(--speed), transform var(--speed);
}

.page-about .about-next__link::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, rgba(255, 200, 87, 0.1), transparent 55%);
  opacity: 0;
  transition: opacity var(--speed);
  pointer-events: none;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-left-color: var(--gold);
  transform: translateX(4px);
}

.page-about .about-next__link:hover::before,
.page-about .about-next__link:focus-visible::before {
  opacity: 1;
}

.page-about .about-next__link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .about-next__kicker {
  grid-column: 1;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .about-next__title {
  grid-column: 1;
  font-size: 16px;
  line-height: 1.5;
}

.page-about .about-next__arrow {
  grid-column: 2;
  grid-row: 1 / span 2;
  font-size: 20px;
  color: var(--ink-soft);
  transition: color var(--speed), transform var(--speed);
}

.page-about .about-next__link:hover .about-next__arrow,
.page-about .about-next__link:focus-visible .about-next__arrow {
  color: var(--gold);
  transform: translateX(3px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .about-split__rail {
    display: block;
    position: sticky;
    top: var(--about-sticky);
    align-self: start;
  }

  .page-about .about-note {
    margin-top: 14px;
  }

  .page-about .about-tag {
    margin-top: 14px;
  }

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

  .page-about .about-next {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding-block: 36px 72px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 64px;
    align-items: start;
  }

  .page-about .about-hero__panel {
    margin-top: 8px;
  }

  .page-about .about-pair {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-pair--flip {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-pair__media {
    margin-top: 0;
  }

  .page-about .about-pair--flip .about-pair__media {
    order: -1;
  }

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

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-figure .media-frame__img,
  .page-about .about-timeline__tip,
  .page-about .about-next__link,
  .page-about .about-next__arrow,
  .page-about .about-columns__item {
    transition: none;
  }

  .page-about .about-figure:hover .media-frame__img,
  .page-about .about-timeline__item:hover .about-timeline__tip,
  .page-about .about-next__link:hover {
    transform: none;
  }
}