.page-about {
  --about-measure: 34em;
  --about-radius: 20px;
}

.page-about img {
  max-width: 100%;
  display: block;
}

.page-about .img-frame {
  overflow: hidden;
  border-radius: var(--about-radius);
}

.page-about .img-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .lede {
  color: var(--silver);
  max-width: var(--about-measure);
}

.page-about .section-head__title {
  font-family: var(--font-head);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.08;
  color: var(--paper);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-block: 8px 40px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(30px, 6.2vw, 52px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin: 14px 0 18px;
  max-width: 22em;
}

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

.page-about .about-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

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

.page-about .about-hero__caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--silver);
  letter-spacing: 0.02em;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: end;
  }
}

/* ---------- 三件事 ---------- */

.page-about .about-do__lede {
  margin-top: 18px;
}

.page-about .about-do__grid {
  margin-top: 34px;
}

.page-about .about-do__card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  border-left: 3px solid var(--line);
  transition: border-color var(--dur-base) var(--ease), transform var(--dur-base) var(--ease);
}

.page-about .about-do__card:hover {
  border-left-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .about-do__card--lead {
  border-left-color: var(--cyan-deep);
  background: linear-gradient(160deg, rgba(31, 240, 206, 0.07), transparent 62%), var(--panel);
}

.page-about .about-do__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-do__card .card__title {
  font-family: var(--font-head);
  font-size: 21px;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 8px 0 0;
}

.page-about .about-do__card .card__body p {
  margin: 0;
  color: var(--silver);
  line-height: 1.85;
}

.page-about .about-do__card .card__meta {
  margin-top: auto;
  font-size: 13px;
  line-height: 1.7;
  color: var(--silver);
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

@media (min-width: 880px) {
  .page-about .about-do__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 时间轴 ---------- */

.page-about .about-era {
  position: relative;
  overflow: hidden;
}

.page-about .about-era__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.page-about .about-era__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.1;
}

.page-about .about-era > .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-era__lede {
  margin-top: 18px;
}

.page-about .era-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 28px 0 44px;
}

.page-about .era-jump a {
  display: inline-block;
  padding: 9px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--silver);
  text-decoration: none;
  transition: border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}

.page-about .era-jump a:hover,
.page-about .era-jump a:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .about-split {
  display: grid;
  gap: 40px;
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: var(--line);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: 42px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 14px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(226, 196, 140, 0.12);
}

.page-about .timeline__item--now::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(31, 240, 206, 0.16);
}

.page-about .timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 5.4vw, 44px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .timeline__item--now .timeline__year {
  color: var(--cyan);
}

.page-about .timeline__head {
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 14px 0 8px;
}

.page-about .timeline__text {
  margin: 0;
  color: var(--silver);
  line-height: 1.85;
  max-width: var(--about-measure);
}

.page-about .readout {
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: var(--panel);
  padding: 22px;
}

.page-about .readout__title {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .readout__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
}

.page-about .readout__row:first-of-type {
  border-top: 0;
}

.page-about .readout__num {
  font-family: var(--font-mono);
  font-size: 24px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .readout__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--silver);
  text-align: right;
}

.page-about .readout--compact .readout__num {
  font-size: 18px;
  color: var(--gold);
}

@media (min-width: 1024px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 62fr) minmax(0, 24fr);
    gap: clamp(32px, 5vw, 80px);
  }

  .page-about .about-split__aside {
    position: sticky;
    top: calc(var(--topbar-h) + 24px);
    align-self: start;
  }
}

/* ---------- 内容生产 ---------- */

.page-about .about-produce__lede {
  margin-top: 18px;
}

.page-about .about-produce__figure {
  margin: 34px 0 44px;
}

.page-about .about-produce__text {
  margin: 0 0 24px;
  color: var(--silver);
  line-height: 1.9;
  max-width: var(--about-measure);
}

.page-about .produce-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .produce-list li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 16px;
  color: var(--silver);
  line-height: 1.85;
  max-width: var(--about-measure);
}

.page-about .produce-list li:last-child {
  margin-bottom: 0;
}

.page-about .produce-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 10px;
  height: 1px;
  background: var(--cyan);
}

.page-about .produce-list strong {
  color: var(--paper);
  font-weight: 700;
}

.page-about .note-card {
  border-left: 3px solid var(--orange);
  padding: 4px 0 4px 18px;
}

.page-about .note-card__title {
  margin: 0 0 10px;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .note-card p {
  margin: 0 0 12px;
  color: var(--silver);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .note-card__link {
  margin: 0;
  font-size: 15px;
}

.page-about .note-card__link a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-fast) var(--ease);
}

.page-about .note-card__link a:hover,
.page-about .note-card__link a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 团队 ---------- */

.page-about .about-team__lede {
  margin-top: 18px;
}

.page-about .team-rows {
  display: grid;
  gap: 1px;
  margin-top: 34px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  overflow: hidden;
}

.page-about .team-row {
  display: grid;
  gap: 12px;
  padding: 26px 22px;
  background: var(--panel);
  transition: background var(--dur-base) var(--ease);
}

.page-about .team-row:hover {
  background: linear-gradient(90deg, rgba(31, 240, 206, 0.06), var(--panel) 55%);
}

.page-about .team-row__figure {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.page-about .team-row__num {
  font-family: var(--font-mono);
  font-size: clamp(32px, 7vw, 44px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--gold);
}

.page-about .team-row__unit {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--silver);
}

.page-about .team-row__title {
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 0 0 10px;
}

.page-about .team-row__text {
  margin: 0;
  color: var(--silver);
  line-height: 1.85;
  max-width: 46em;
}

@media (min-width: 760px) {
  .page-about .team-row {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 28px;
    align-items: start;
    padding: 30px 30px;
  }
}

/* ---------- 荣誉 ---------- */

.page-about .about-honor__lede {
  margin-top: 18px;
}

.page-about .honor-grid {
  display: grid;
  gap: 16px;
  margin-top: 34px;
}

.page-about .honor-card {
  border: 1px solid var(--gold);
  border-radius: var(--about-radius);
  padding: 24px;
  background: linear-gradient(180deg, rgba(226, 196, 140, 0.08), transparent 62%);
  transition: transform var(--dur-base) var(--ease), border-color var(--dur-base) var(--ease);
}

.page-about .honor-card:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.page-about .honor-card__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .honor-card__title {
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 12px 0 10px;
}

.page-about .honor-card__text {
  margin: 0;
  color: var(--silver);
  font-size: 15px;
  line-height: 1.85;
}

@media (min-width: 760px) {
  .page-about .honor-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 覆盖与节奏 ---------- */

.page-about .reach-stats {
  display: grid;
  gap: 26px;
  margin: 30px 0 44px;
}

.page-about .reach-stats .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 6vw, 46px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .reach-stats .stat__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--silver);
  line-height: 1.7;
}

.page-about .about-reach__text {
  margin: 0 0 20px;
  color: var(--silver);
  line-height: 1.9;
  max-width: var(--about-measure);
}

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

@media (min-width: 680px) {
  .page-about .reach-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 结尾入口 ---------- */

.page-about .about-next__inner {
  display: grid;
  gap: 18px;
  border-top: 1px solid var(--line);
  padding-top: 42px;
}

.page-about .about-next__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(24px, 4.6vw, 38px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin: 0;
}

.page-about .about-next__text {
  margin: 0;
  color: var(--silver);
  line-height: 1.85;
  max-width: var(--about-measure);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

.page-about .about-next__back {
  margin: 6px 0 0;
  font-size: 14px;
}

.page-about .about-next__back a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-fast) var(--ease);
}

.page-about .about-next__back a:hover,
.page-about .about-next__back a:focus-visible {
  border-bottom-color: var(--cyan);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-do__card,
  .page-about .team-row,
  .page-about .honor-card {
    transition: none;
  }

  .page-about .about-do__card:hover,
  .page-about .honor-card:hover {
    transform: none;
  }
}