.page-about {
  --about-line: var(--c-grid);
  padding-bottom: clamp(56px, 9vw, 104px);
}

.page-about .breadcrumb {
  margin: 0 0 clamp(20px, 3vw, 32px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-bottom: clamp(32px, 5vw, 56px);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: min(340px, 56%);
  height: 2px;
  background: linear-gradient(90deg, var(--c-blue), var(--c-orange));
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 4.8vw, 3.2rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--c-bright);
  max-width: 20ch;
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 62ch;
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  line-height: 1.75;
  color: var(--c-text);
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-stat {
  background: linear-gradient(160deg, var(--c-navy), var(--c-void));
  padding: 16px 18px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-stat__num {
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
  line-height: 1.1;
  color: var(--c-bright);
}

.page-about .about-stat__unit {
  font-size: 0.55em;
  margin-left: 3px;
  color: var(--c-blue-soft);
}

.page-about .about-stat__label {
  font-family: var(--font-head);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--c-text);
}

/* ---------- 双栏推进 ---------- */
.page-about .about-section {
  position: relative;
}

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

.page-about .about-h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.55rem, 3vw, 2.3rem);
  line-height: 1.2;
  color: var(--c-bright);
}

.page-about .about-row__body p {
  margin: 0 0 1.2em;
  max-width: 68ch;
  font-size: 1rem;
  line-height: 1.75;
}

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

/* ---------- 图片 ---------- */
.page-about .about-figure {
  position: relative;
  margin: 0 0 clamp(20px, 3vw, 28px);
  border: 1px solid var(--about-line);
  background: var(--c-navy);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
}

.page-about .about-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(135deg, rgba(10, 132, 255, 0.26), rgba(10, 132, 255, 0) 46%, rgba(255, 107, 53, 0.2));
}

.page-about .about-figure .media__caption {
  position: relative;
  z-index: 1;
  margin: 0;
  padding: 10px 14px;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--c-text);
  border-top: 1px solid var(--about-line);
}

/* ---------- 岗位折叠 ---------- */
.page-about .role {
  border-top: 1px solid var(--about-line);
}

.page-about .role:last-of-type {
  border-bottom: 1px solid var(--about-line);
}

.page-about .role__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  list-style: none;
  cursor: pointer;
  padding: 14px 2px;
  font-family: var(--font-head);
  font-size: 1rem;
  letter-spacing: 0.02em;
  color: var(--c-bright);
}

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

.page-about .role__summary::after {
  content: "＋";
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--c-orange);
  flex: none;
}

.page-about .role[open] .role__summary::after {
  content: "－";
}

.page-about .role__summary:focus-visible {
  outline: 2px solid var(--c-live);
  outline-offset: 2px;
}

.page-about .role__body {
  margin: 0 0 16px;
  max-width: 68ch;
  font-size: 0.9688rem;
  line-height: 1.75;
  color: var(--c-text);
}

/* ---------- 数据图例 ---------- */
.page-about .about-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .about-legend .legend__item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9375rem;
  line-height: 1.6;
}

.page-about .about-legend__dot {
  flex: none;
  width: 10px;
  height: 10px;
  transform: rotate(45deg);
}

.page-about .about-legend__dot--blue {
  background: var(--c-blue);
}

.page-about .about-legend__dot--orange {
  background: var(--c-orange);
}

/* ---------- 年份轨道 ---------- */
.page-about .about-timeline .about-h2 {
  max-width: 24ch;
}

.page-about .about-timeline__lede {
  margin: clamp(14px, 2vw, 20px) 0 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.75;
}

.page-about .track {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  display: flex;
  gap: 0;
  overflow-x: auto;
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .track__node {
  position: relative;
  flex: 1 0 236px;
  padding: 26px 18px 24px;
  border-right: 1px solid var(--about-line);
  scroll-snap-align: start;
  transition: background 0.26s var(--ease-speed);
}

.page-about .track__node:last-child {
  border-right: 0;
}

.page-about .track__node::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 18px;
  width: 9px;
  height: 9px;
  background: var(--c-blue);
  transform: rotate(45deg);
}

.page-about .track__node:nth-child(even)::before {
  background: var(--c-orange);
}

.page-about .track__node:hover,
.page-about .track__node:focus-visible {
  background: linear-gradient(180deg, rgba(10, 132, 255, 0.1), rgba(6, 8, 12, 0));
  outline: none;
}

.page-about .track__node:focus-visible {
  box-shadow: inset 0 0 0 2px var(--c-live);
}

.page-about .track__year {
  display: block;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  color: var(--c-orange);
}

.page-about .track__name {
  display: block;
  margin-top: 8px;
  font-family: var(--font-head);
  font-size: 1rem;
  color: var(--c-bright);
}

.page-about .track__note {
  display: block;
  margin-top: 8px;
  font-size: 0.9063rem;
  line-height: 1.7;
  color: var(--c-text);
  opacity: 0.6;
  transform: translateY(3px);
  transition: opacity 0.26s var(--ease-speed), transform 0.26s var(--ease-speed);
}

.page-about .track__node:hover .track__note,
.page-about .track__node:focus-visible .track__note,
.page-about .track__node:focus-within .track__note {
  opacity: 1;
  transform: none;
}

/* ---------- 数据带 ---------- */
.page-about .databand {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .databand__item {
  background: var(--c-navy);
  padding: 15px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .databand__num {
  font-size: 1.5rem;
  line-height: 1.1;
  color: var(--c-bright);
}

.page-about .databand__unit {
  font-size: 0.5em;
  margin-left: 3px;
  color: var(--c-blue-soft);
}

.page-about .databand__label {
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--c-text);
}

/* ---------- 后续路径 ---------- */
.page-about .about-next {
  margin-top: clamp(24px, 4vw, 36px);
  border-top: 1px solid var(--about-line);
  padding-top: clamp(18px, 3vw, 26px);
}

.page-about .about-next__kicker {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-orange);
}

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

.page-about .about-next__item {
  background: var(--c-void);
  padding: 15px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-next__link {
  font-family: var(--font-head);
  font-size: 1rem;
  color: var(--c-bright);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease-speed), border-color 0.2s var(--ease-speed);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  color: var(--c-blue-soft);
  border-bottom-color: var(--c-blue-soft);
}

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

.page-about .about-next__desc {
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--c-text);
}

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

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

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

  .page-about .about-legend {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px 24px;
  }

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

@media (min-width: 900px) {
  .page-about .about-row {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-row__aside {
    position: sticky;
    top: calc(var(--bar-h) + 24px);
  }

  .page-about .about-row--flip .about-row__aside {
    order: 2;
  }

  .page-about .about-row--flip .about-row__body {
    order: 1;
  }

  .page-about .about-timeline__lede {
    max-width: 56ch;
  }
}

@media (min-width: 1200px) {
  .page-about .databand {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .databand--wide {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .track__note,
  .page-about .track__node,
  .page-about .about-next__link {
    transition: none;
  }

  .page-about .track__note {
    transform: none;
  }
}