.page-about {
  --axis-gap: clamp(18px, 3.6vw, 56px);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(18px, 3.5vw, 36px);
  font-size: 13px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  padding: clamp(28px, 5vw, 56px) 0 clamp(36px, 6vw, 76px);
  border-bottom: 1px solid var(--line);
}

@media (min-width: 920px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6.8vw, 76px);
  line-height: 1.0;
  letter-spacing: -0.02em;
  margin: 14px 0 22px;
  max-width: 15ch;
  color: var(--ink);
}

.page-about .about-hero__intro {
  max-width: 34ch;
  color: var(--muted);
  font-size: 16px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__panel {
  position: relative;
  border: 1px solid var(--line);
  background: var(--panel);
  padding: clamp(18px, 3vw, 28px);
  overflow: hidden;
}

.page-about .about-hero__panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--cyan-dim) 55%, transparent 100%);
}

.page-about .about-hero__panel-title {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

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

.page-about .about-brief__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-brief dt {
  color: var(--muted);
  font-size: 14px;
}

.page-about .about-brief dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

.page-about .about-brief__row--amber dd {
  color: var(--amber);
}

/* ---------- 竖向刻度轴 ---------- */
.page-about .about-axis {
  position: relative;
  border-left: 1px solid var(--line);
  padding-left: var(--axis-gap);
  margin-top: clamp(8px, 2vw, 20px);
}

.page-about .about-block {
  position: relative;
  padding: clamp(34px, 5.5vw, 68px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-block:first-child {
  border-top: 0;
  padding-top: clamp(24px, 4vw, 44px);
}

.page-about .about-block::before {
  content: "";
  position: absolute;
  top: calc(clamp(34px, 5.5vw, 68px) - 4px);
  left: calc(-1 * var(--axis-gap) - 4px);
  width: 7px;
  height: 7px;
  background: var(--bg);
  border: 1px solid var(--cyan-dim);
}

.page-about .about-block:first-child::before {
  top: calc(clamp(24px, 4vw, 44px) - 4px);
}

.page-about .about-block__index {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .about-block__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3.3vw, 38px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--ink);
  max-width: 24ch;
}

.page-about .about-block__note {
  max-width: 46ch;
  font-size: 14px;
  margin: 0 0 clamp(20px, 3vw, 32px);
}

.page-about .about-block__cols {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

@media (min-width: 880px) {
  .page-about .about-block__cols {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

.page-about .about-block__main p {
  margin: 0 0 16px;
}

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

/* 要点列表 */
.page-about .about-points {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-points__item {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink);
}

.page-about .about-points__no {
  flex: none;
  font-size: 12px;
  color: var(--cyan);
  letter-spacing: 0.1em;
}

/* ---------- 图片容器 ---------- */
.page-about .about-block__figure {
  margin: 0 0 clamp(24px, 4vw, 40px);
}

.page-about .about-reach__figure {
  margin: clamp(26px, 4vw, 44px) 0 0;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.05);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  margin-top: clamp(8px, 2vw, 18px);
}

@media (min-width: 920px) {
  .page-about .about-timeline {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }
}

.page-about .about-timeline__rail {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
  border-left: 1px solid var(--line);
}

.page-about .about-timeline__node {
  position: relative;
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 3px 14px;
  width: 100%;
  text-align: left;
  padding: 16px 14px 16px 26px;
  background: transparent;
  border: 0;
  border-top: 1px solid var(--line);
  color: var(--ink);
  font: inherit;
  cursor: pointer;
  transition: background var(--dur) var(--ease);
}

.page-about .about-timeline__node:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-timeline__node:hover {
  background: var(--bg-alt);
}

.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 21px;
  width: 9px;
  height: 9px;
  background: var(--bg);
  border: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-timeline__node[aria-selected="true"]::before {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 5px rgba(53, 242, 224, 0.14);
}

.page-about .about-timeline__year {
  grid-column: 1;
  grid-row: 1;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-timeline__node[aria-selected="true"] .about-timeline__year {
  color: var(--cyan);
}

.page-about .about-timeline__name {
  grid-column: 2;
  grid-row: 1;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.45;
}

.page-about .about-timeline__desc {
  grid-column: 2;
  grid-row: 2;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
}

.page-about .about-timeline__panel {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: clamp(20px, 3vw, 32px);
}

.page-about .about-timeline__panel-title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-timeline__panel p {
  margin: 0 0 18px;
  color: var(--muted);
}

.page-about .about-timeline__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-timeline__facts li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--ink);
}

.page-about .about-timeline__facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(22px, 3.5vw, 44px);
  margin-bottom: clamp(26px, 4vw, 44px);
}

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

.page-about .about-team__body p {
  margin: 0 0 16px;
}

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

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

.page-about .about-lane {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2.4vw, 24px);
  border: 1px solid var(--line);
  background: var(--panel);
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-lane:hover {
  border-color: var(--cyan-dim);
}

.page-about .about-lane__no {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-lane .card__title {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--ink);
}

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

@media (max-width: 980px) {
  .page-about .about-lanes > * {
    grid-column: span 6;
  }
}

@media (max-width: 640px) {
  .page-about .about-lanes > * {
    grid-column: 1 / -1;
  }
  .page-about .about-lanes {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ---------- 专栏作者 ---------- */
.page-about .about-authors {
  display: grid;
  gap: clamp(22px, 3.5vw, 44px);
}

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

.page-about .about-authors__text p {
  margin: 0 0 16px;
}

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

.page-about .about-authors__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-authors__stat {
  background: var(--bg-alt);
  padding: clamp(14px, 2.4vw, 22px);
}

.page-about .about-authors__stat-value {
  margin: 0 0 6px;
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-authors__stat-label {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 更新节奏（窄栏） ---------- */
.page-about .about-block--tight {
  max-width: 100%;
}

.page-about .about-cadence {
  display: grid;
  gap: 0;
  max-width: 62ch;
}

.page-about .about-cadence__item {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-cadence__item:last-child {
  border-bottom: 1px solid var(--line);
}

@media (min-width: 760px) {
  .page-about .about-cadence__item {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 28px;
    align-items: baseline;
  }
}

.page-about .about-cadence__time {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-cadence__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink);
}

/* ---------- 服务覆盖 ---------- */
.page-about .about-reach {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

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

.page-about .about-map {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 7px;
  padding: clamp(16px, 2.6vw, 24px);
  border: 1px solid var(--line);
  background: var(--bg-alt);
}

.page-about .about-map__dot {
  display: block;
  aspect-ratio: 1 / 1;
  background: var(--line);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-map__dot--lit {
  background: var(--cyan-dim);
}

.page-about .about-map__dot:hover {
  background: var(--cyan);
  transform: scale(1.4);
}

.page-about .about-reach__map-note {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.6;
}

.page-about .about-reach__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-reach__stat {
  background: var(--panel);
  padding: clamp(16px, 2.6vw, 26px);
  transition: background var(--dur) var(--ease);
}

.page-about .about-reach__stat:hover {
  background: var(--bg-alt);
}

.page-about .about-reach__stat-value {
  margin: 0 0 8px;
  font-size: clamp(24px, 3.6vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-reach__stat--amber .about-reach__stat-value {
  color: var(--amber);
}

.page-about .about-reach__stat-label {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 合作与参数 ---------- */
.page-about .about-params {
  display: grid;
  border-top: 1px solid var(--line);
  max-width: 76ch;
}

.page-about .about-params .param {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

@media (min-width: 700px) {
  .page-about .about-params .param {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

.page-about .about-params .param__key {
  font-size: 14px;
  color: var(--muted);
}

.page-about .about-params .param__val {
  font-size: 15px;
  color: var(--ink);
}

/* ---------- 继续入口 ---------- */
.page-about .about-block--next {
  padding-bottom: clamp(44px, 7vw, 88px);
}

.page-about .about-next {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 880px) {
  .page-about .about-next {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-next__item {
  display: grid;
  gap: 10px;
  padding: clamp(20px, 3vw, 30px);
  background: var(--bg-alt);
  text-decoration: none;
  color: var(--ink);
  transition: background var(--dur) var(--ease);
}

.page-about .about-next__item:hover {
  background: var(--panel);
}

.page-about .about-next__no {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-next__label {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.3;
}

.page-about .about-next__desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-next__item:hover .about-next__desc {
  color: var(--ink);
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-map__dot,
  .page-about .about-lane,
  .page-about .about-reach__stat,
  .page-about .about-next__item,
  .page-about .about-timeline__node::before {
    transition: none;
  }
  .page-about .about-map__dot:hover {
    transform: none;
  }
}