.page-about {
  --about-line: 1px solid var(--ink-200);
  --about-pad: clamp(1.25rem, 4vw, 3rem);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(2rem, 6vw, 4.5rem) 0 clamp(2rem, 5vw, 3.5rem);
  background:
    radial-gradient(120% 90% at 8% 0%, rgba(30, 75, 224, 0.28) 0%, rgba(6, 11, 18, 0) 62%),
    radial-gradient(90% 80% at 92% 18%, rgba(23, 179, 168, 0.16) 0%, rgba(6, 11, 18, 0) 58%);
}

.page-about .about-hero__inner {
  max-width: var(--shell-max);
}

.page-about .about-hero .chapter__title {
  font-size: clamp(1.85rem, 6.4vw, 3.6rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  max-width: 22ch;
}

.page-about .about-hero__lead {
  margin: 1.5rem 0 0;
  max-width: 64ch;
  color: var(--text-dim);
  font-size: 1.0625rem;
  line-height: 1.85;
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(2rem, 5vw, 3rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: var(--about-line);
  border-left: var(--about-line);
}

.page-about .about-facts__item {
  border-right: var(--about-line);
  border-bottom: var(--about-line);
  padding: 1.1rem 1rem 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.page-about .about-facts__value {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 5vw, 1.9rem);
  letter-spacing: 0.04em;
  color: var(--text);
}

.page-about .about-facts__item:nth-child(1) .about-facts__value { color: var(--lime); }
.page-about .about-facts__item:nth-child(3) .about-facts__value { color: var(--cyan); }

.page-about .about-facts__label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--text-dim);
}

/* ---------- 左右交替带状 ---------- */
.page-about .band-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
}

.page-about .band-row__text > * + * {
  margin-top: 1rem;
}

.page-about .band-row__text p {
  max-width: 62ch;
}

.page-about .band-row__media {
  margin: 0;
}

/* ---------- 场景清单 ---------- */
.page-about .about-scenarios {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: var(--about-line);
}

.page-about .about-scenarios__item {
  border-bottom: var(--about-line);
  padding: 1.1rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.page-about .about-scenarios__tag {
  align-self: flex-start;
}

.page-about .about-scenarios__item p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.95rem;
  line-height: 1.75;
}

/* ---------- 规模数字 ---------- */
.page-about .about-scale__lead {
  font-size: 1.0625rem;
}

.page-about .about-stats {
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: var(--about-line);
  border-left: var(--about-line);
}

.page-about .about-stats__item {
  border-right: var(--about-line);
  border-bottom: var(--about-line);
  padding: 1rem 0.9rem 1.15rem;
}

.page-about .about-stats__label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  display: block;
  margin-bottom: 0.5rem;
}

.page-about .about-stats__value {
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 4.6vw, 1.75rem);
  letter-spacing: 0.04em;
  color: var(--text);
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
}

.page-about .about-stats__unit {
  font-size: 0.8rem;
  color: var(--text-dim);
  letter-spacing: 0.08em;
}

.page-about .about-stats__item:nth-child(2) .about-stats__value { color: var(--cyan); }
.page-about .about-stats__item:nth-child(4) .about-stats__value { color: var(--lime); }
.page-about .about-stats__item:nth-child(6) .about-stats__value { color: var(--violet); }

.page-about .about-scale__note {
  margin-top: 1.5rem;
  padding-left: 1rem;
  border-left: 2px solid var(--orange);
  color: var(--text-dim);
}

/* ---------- 团队分工 ---------- */
.page-about .about-team__intro {
  max-width: 58ch;
  color: var(--text-dim);
  margin-bottom: clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .about-team {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--about-line);
}

.page-about .about-team__item {
  border-bottom: var(--about-line);
  padding: 1.25rem 0 1.4rem;
}

.page-about .about-team__index {
  display: block;
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  color: var(--cobalt-lit);
  margin-bottom: 0.5rem;
}

.page-about .about-team__name {
  margin: 0 0 0.5rem;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
}

.page-about .about-team__item p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.95rem;
  line-height: 1.8;
}

/* ---------- 时间线 ---------- */
.page-about .about-terrain {
  margin: 0 0 clamp(1.75rem, 4vw, 2.75rem);
  border: var(--about-line);
}

.page-about .about-yearjump {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}

.page-about .about-yearjump__link {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
  text-decoration: none;
  border: 1px solid var(--ink-200);
  padding: 0.45rem 0.9rem;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-about .about-yearjump__link:hover,
.page-about .about-yearjump__link:focus-visible {
  border-color: var(--cyan);
  color: var(--text);
}

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

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 2.25rem 1.75rem;
  border-left: 1px solid var(--ink-200);
}

.page-about .about-timeline__item:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 0.55rem;
  width: 9px;
  height: 9px;
  background: var(--cyan);
  transition: transform 180ms var(--ease), background 180ms var(--ease);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  transform: scale(1.7);
  background: var(--lime);
}

.page-about .about-timeline__year {
  display: inline-block;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  color: var(--lime);
  background: linear-gradient(90deg, rgba(30, 75, 224, 0.55), rgba(30, 75, 224, 0));
  border-left: 3px solid var(--cobalt);
  padding: 0.2rem 0.75rem 0.2rem 0.55rem;
  margin-bottom: 0.65rem;
}

.page-about .about-timeline__body {
  max-width: 62ch;
}

.page-about .about-timeline__title {
  margin: 0 0 0.45rem;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
}

.page-about .about-timeline__body p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.95rem;
  line-height: 1.8;
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence__intro {
  max-width: 62ch;
  color: var(--text-dim);
  margin-bottom: clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .about-cadence {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--about-line);
}

.page-about .about-cadence__row {
  border-bottom: var(--about-line);
  padding: 1.05rem 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.5rem;
}

.page-about .about-cadence__freq {
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .about-cadence__what {
  color: var(--text);
  font-size: 0.95rem;
  line-height: 1.75;
}

.page-about .about-cadence__who {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

.page-about .about-cadence__note {
  margin-top: 1.5rem;
  color: var(--text-dim);
}

.page-about .about-cadence__note a {
  color: var(--cyan);
}

/* ---------- 合作伙伴 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: var(--about-line);
}

.page-about .about-partner {
  border-bottom: var(--about-line);
  border-right: none;
  padding: 1.35rem 0 1.5rem;
}

.page-about .about-partner__name {
  margin: 0 0 0.6rem;
  font-size: 1rem;
  letter-spacing: -0.01em;
  color: var(--text);
  padding-left: 0.7rem;
  border-left: 3px solid var(--cobalt);
}

.page-about .about-partner p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.95rem;
  line-height: 1.8;
  max-width: 58ch;
}

.page-about .about-cta {
  margin-top: clamp(2rem, 5vw, 3rem);
  padding: clamp(1.5rem, 4vw, 2.25rem);
  background: var(--ink-100);
  border: var(--about-line);
  border-left: 3px solid var(--cobalt);
}

.page-about .about-cta__text {
  margin: 0 0 1.5rem;
  color: var(--text-dim);
}

.page-about .about-cta__text a {
  color: var(--cyan);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

/* ---------- 桌面端错位排版 ---------- */
@media (min-width: 760px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    border-left: var(--about-line);
  }

  .page-about .about-partner {
    border-right: var(--about-line);
    padding: 1.5rem 1.35rem 1.65rem;
  }

  .page-about .about-cadence__row {
    grid-template-columns: 12rem minmax(0, 1fr) 9rem;
    align-items: baseline;
    gap: 1.25rem;
  }

  .page-about .about-cadence__who {
    text-align: right;
  }
}

@media (min-width: 1000px) {
  .page-about .band-row {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-about .band-row__text {
    grid-column: 1 / span 7;
  }

  .page-about .band-row__media {
    grid-column: 9 / span 4;
  }

  .page-about .band-row--media-first .band-row__media {
    grid-column: 1 / span 5;
    order: -1;
  }

  .page-about .band-row--media-first .band-row__text {
    grid-column: 7 / span 6;
  }

  .page-about .band-row--team .band-row__text {
    grid-column: 1 / span 7;
  }

  .page-about .band-row--team .band-row__media {
    grid-column: 9 / span 4;
    align-self: stretch;
  }

  .page-about .about-timeline {
    margin-left: 11rem;
  }

  .page-about .about-timeline__item {
    padding-left: 2.25rem;
  }

  .page-about .about-timeline__year {
    position: absolute;
    left: -11rem;
    top: 0;
    width: 9.25rem;
    text-align: right;
    font-size: 1.9rem;
    letter-spacing: 0.04em;
    background: linear-gradient(270deg, rgba(30, 75, 224, 0.6), rgba(30, 75, 224, 0));
    border-left: none;
    border-right: 3px solid var(--cobalt);
    padding: 0.15rem 0.65rem 0.15rem 0.75rem;
    margin-bottom: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item::before,
  .page-about .about-yearjump__link {
    transition: none;
  }

  .page-about .about-timeline__item:hover::before,
  .page-about .about-timeline__item:focus-within::before {
    transform: none;
  }
}