.page-about {
  --about-rail-w: 132px;
  --about-gutter: 48px;
}

/* ---------- 刊头区块 ---------- */
.page-about .about-head {
  padding: 40px 0 64px;
  border-bottom: 1px solid var(--edge);
}

.page-about .about-head__meta {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 24px;
}

.page-about .about-head__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 6vw, 58px);
  line-height: 1.1;
  letter-spacing: -0.005em;
  color: var(--white);
  margin: 0 0 36px;
  max-width: 16em;
  text-transform: uppercase;
}

.page-about .about-head__body {
  display: grid;
  gap: 20px;
  max-width: 900px;
}

.page-about .about-head__body p {
  color: var(--mute);
  font-size: 16px;
  line-height: 1.85;
  margin: 0;
}

@media (min-width: 900px) {
  .page-about .about-head {
    padding: 56px 0 80px;
  }
  .page-about .about-head__body {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 0 56px;
  }
  .page-about .about-head__title {
    margin-bottom: 48px;
    letter-spacing: -0.01em;
  }
}

/* ---------- 通用分节骨架 ---------- */
.page-about .about-sec {
  display: grid;
  gap: 20px;
  padding: 56px 0;
  border-top: 1px solid var(--edge);
}

.page-about .about-sec__rail {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .about-rail-num {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .about-rail-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--mute);
  text-transform: uppercase;
}

.page-about .about-sec__body {
  max-width: 760px;
}

.page-about .about-sec__body h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.25;
  color: var(--white);
  margin: 0 0 20px;
  letter-spacing: 0.005em;
}

.page-about .about-sec__body h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 17px;
  color: var(--white);
  margin: 0 0 6px;
  line-height: 1.35;
}

.page-about .about-sec__body p {
  color: var(--mute);
  font-size: 16px;
  line-height: 1.85;
  margin: 0 0 20px;
}

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

.page-about .about-sec__body a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}

.page-about .about-sec__body a:hover {
  color: var(--lime);
}

@media (min-width: 900px) {
  .page-about .about-sec {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-gutter);
    padding: 80px 0;
  }
  .page-about .about-sec__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    position: sticky;
    top: 110px;
    align-self: start;
  }
  .page-about .about-rail-num {
    font-size: 44px;
  }
  .page-about .about-rail-tag {
    writing-mode: vertical-rl;
    letter-spacing: 0.36em;
  }
}

/* ---------- 内联注记 ---------- */
.page-about .about-sec__body .about-aside {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.95;
  color: var(--cyan);
  background: rgba(53, 225, 240, 0.05);
  border-left: 3px solid var(--cyan);
  padding: 16px 20px;
  letter-spacing: 0.02em;
  margin: 28px 0 0;
}

/* ---------- 数据锚点 ---------- */
.page-about .about-anchors {
  display: grid;
  gap: 18px;
  margin: 30px 0 34px;
}

.page-about .about-anchor {
  padding: 14px 18px 16px 20px;
  border-left: 3px solid var(--cyan);
  background: linear-gradient(90deg, rgba(53, 225, 240, 0.08), rgba(53, 225, 240, 0) 82%);
}

.page-about .about-anchor:nth-child(2) {
  border-color: var(--lime);
  background: linear-gradient(90deg, rgba(141, 240, 90, 0.08), rgba(141, 240, 90, 0) 82%);
}

.page-about .about-anchor:nth-child(3) {
  border-color: var(--gold);
  background: linear-gradient(90deg, rgba(245, 179, 60, 0.08), rgba(245, 179, 60, 0) 82%);
}

.page-about .about-anchor__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(38px, 6.4vw, 58px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-anchor__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mute);
  text-transform: uppercase;
  margin: 8px 0 10px;
}

.page-about .about-sec__body .about-anchor p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--mute);
  margin: 0;
}

@media (min-width: 720px) {
  .page-about .about-anchors {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    background: var(--board);
    border: 1px solid var(--edge);
  }
  .page-about .about-anchor {
    border-left-width: 3px;
  }
  .page-about .about-anchor + .about-anchor {
    border-top: none;
  }
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__fig {
  margin: 8px 0 34px;
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 14px;
  bottom: 26px;
  left: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--cyan) 45%, var(--lime) 72%, var(--gold) 100%);
  opacity: 0.55;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 34px 38px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
}

.page-about .about-timeline__item--lime::before {
  border-color: var(--lime);
}

.page-about .about-timeline__item--gold::before {
  border-color: var(--gold);
  box-shadow: 0 0 0 4px rgba(245, 179, 60, 0.12);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 22px;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cyan);
  margin-bottom: 10px;
}

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

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

.page-about .about-sec__body .about-timeline__content p {
  font-size: 15px;
  line-height: 1.75;
  margin: 0;
}

@media (min-width: 720px) {
  .page-about .about-timeline {
    padding-left: 12px;
  }
  .page-about .about-timeline::before {
    left: 20px;
  }
  .page-about .about-timeline__item {
    padding-left: 58px;
  }
  .page-about .about-timeline__item::before {
    left: 14px;
  }
}

/* ---------- 团队区块 ---------- */
.page-about .about-team {
  display: grid;
  gap: 32px;
  margin-top: 20px;
}

.page-about .about-sec__body .about-team__note {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.8;
  color: var(--white);
  background: var(--board);
  border: 1px solid var(--edge);
  border-left: 3px solid var(--lime);
  padding: 14px 18px;
  margin: 24px 0 0;
}

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

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 40px;
    align-items: start;
  }
}

/* ---------- 数据来源 ---------- */
.page-about .about-source__fig {
  margin: 32px 0 0;
}

/* ---------- 联系与资质 ---------- */
.page-about .about-contact {
  display: grid;
  gap: 18px;
  margin: 30px 0 32px;
  padding: 24px 22px;
  background: var(--board);
  border: 1px solid var(--edge);
  border-left: 3px solid var(--cyan);
}

.page-about .about-contact dt {
  color: var(--cyan);
  margin-bottom: 6px;
}

.page-about .about-contact dd {
  margin: 0;
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.65;
  word-break: break-word;
}

@media (min-width: 720px) {
  .page-about .about-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 36px;
    padding: 28px 28px;
  }
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 8px 0 0;
}

.page-about .about-cta .btn {
  margin: 0;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-head,
  .page-about .about-sec {
    transform: none !important;
    transition: none !important;
  }
}