.page-about {
  --ab-line: rgba(216, 161, 58, .22);
  --ab-line-soft: rgba(244, 241, 232, .1);
  --ab-fill: rgba(244, 241, 232, .035);
  display: block;
  color: var(--paper);
}

.page-about .ab-hero {
  padding: 30px 0 10px;
}

.page-about .breadcrumb {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: rgba(244, 241, 232, .5);
  margin-bottom: 26px;
}

.page-about .breadcrumb a {
  color: var(--gold);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  color: var(--gold-soft);
}

.page-about .ab-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

.page-about .ab-hero h1 {
  font-size: clamp(30px, 7.4vw, 46px);
  line-height: 1.1;
  letter-spacing: -.02em;
  font-weight: 900;
  margin: 10px 0 16px;
}

.page-about .ab-hero .lede {
  font-size: 16px;
  line-height: 1.72;
  color: rgba(244, 241, 232, .78);
  max-width: 46ch;
  margin: 0;
}

.page-about .ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .ab-plate {
  position: relative;
  border: 1px solid var(--ab-line);
  background: var(--ab-fill);
  padding: 22px 20px 24px;
}

.page-about .ab-plate::after {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px solid rgba(216, 161, 58, .12);
  pointer-events: none;
}

.page-about .ab-plate-head {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: rgba(244, 241, 232, .55);
  margin: 0 0 18px;
}

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 14px;
  margin: 0;
  padding: 0;
}

.page-about .ab-stat {
  margin: 0;
}

.page-about .ab-stat dt {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: rgba(244, 241, 232, .55);
  margin: 0;
}

.page-about .ab-stat dd {
  margin: 6px 0 0;
  font-family: var(--mono);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--gold);
  line-height: 1.1;
}

.page-about .ab-stat dd span {
  font-size: 13px;
  font-weight: 400;
  color: rgba(244, 241, 232, .7);
  margin-left: 3px;
  letter-spacing: 0;
}

.page-about .ab-section {
  padding: 54px 0;
}

.page-about .ab-head {
  margin-bottom: 4px;
}

.page-about .ab-head .section-title {
  font-size: clamp(22px, 5.4vw, 32px);
  line-height: 1.22;
  letter-spacing: -.01em;
  margin: 8px 0 0;
}

.page-about .ab-lede {
  font-size: 15.5px;
  line-height: 1.72;
  color: rgba(244, 241, 232, .75);
  max-width: 66ch;
  margin: 16px 0 0;
}

.page-about .ab-lede--slate {
  margin-top: 28px;
  color: rgba(244, 241, 232, .82);
}

.page-about .ab-figure {
  margin: 30px 0 0;
}

.page-about .ab-figure--mid {
  margin: 30px 0 0;
}

.page-about .ab-figure--side {
  margin: 4px 0 0;
}

.page-about .figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .figure-cap {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(244, 241, 232, .5);
  margin-top: 10px;
}

/* ---- 时间线 ---- */
.page-about .ab-tl {
  list-style: none;
  margin: 38px 0 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(216, 161, 58, .12) 100%);
}

.page-about .ab-tl-node {
  position: relative;
  padding-bottom: 32px;
}

.page-about .ab-tl-node:last-child {
  padding-bottom: 0;
}

.page-about .ab-tl-node::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 6px;
  width: 9px;
  height: 9px;
  box-sizing: border-box;
  border-radius: 50%;
  border: 1px solid var(--gold);
  background: var(--ink);
}

.page-about .ab-tl-node--on::before {
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(216, 161, 58, .14);
}

.page-about .ab-tl-year {
  display: block;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--gold);
  margin-bottom: 6px;
}

.page-about .ab-tl-title {
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .ab-tl-node p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(244, 241, 232, .72);
  max-width: 62ch;
}

/* ---- 版本对照 ---- */
.page-about .ab-ver-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 30px;
}

.page-about .ab-ver {
  display: flex;
  flex-direction: column;
  gap: 10px;
  border: 1px solid var(--ab-line-soft);
  background: var(--ab-fill);
  padding: 20px 18px 22px;
}

.page-about .ab-ver--now {
  border-color: var(--ab-line);
  background: linear-gradient(180deg, rgba(216, 161, 58, .09), rgba(216, 161, 58, .015));
}

.page-about .ab-ver-tag {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .ab-ver h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.36;
  color: var(--paper);
}

.page-about .ab-ver > p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(244, 241, 232, .72);
}

.page-about .ab-ver-rows {
  margin-top: 4px;
  padding-top: 12px;
  border-top: 1px solid var(--ab-line-soft);
  display: grid;
  gap: 8px;
}

.page-about .ab-ver-row {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 10px;
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: rgba(244, 241, 232, .72);
}

.page-about .ab-ver-key {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(216, 161, 58, .9);
}

/* ---- 团队 ---- */
.page-about .ab-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 30px;
  align-items: start;
}

.page-about .ab-team-copy p {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.72;
  color: rgba(244, 241, 232, .76);
  max-width: 64ch;
}

.page-about .ab-groups {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 24px;
}

.page-about .ab-group {
  border: 1px solid var(--ab-line-soft);
  border-left: 2px solid var(--gold);
  background: rgba(244, 241, 232, .03);
  padding: 14px 16px 16px;
}

.page-about .ab-group svg {
  display: block;
  width: 20px;
  height: 20px;
  margin-bottom: 9px;
  fill: none;
  stroke: var(--gold);
  stroke-width: 1.3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.page-about .ab-group h3 {
  margin: 0 0 4px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-group p {
  margin: 0;
  font-size: 14px;
  line-height: 1.66;
  color: rgba(244, 241, 232, .7);
}

/* ---- 合作方 ---- */
.page-about .ab-partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 30px;
}

.page-about .ab-partner {
  border-top: 2px solid var(--gold);
  padding-top: 16px;
}

.page-about .ab-partner-num {
  display: block;
  font-family: var(--mono);
  font-size: 38px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .ab-partner-label {
  display: block;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--gold-soft);
  margin: 8px 0 12px;
}

.page-about .ab-partner p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(244, 241, 232, .86);
}

.page-about .ab-source-note {
  margin: 30px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--gold);
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 241, 232, .74);
  max-width: 70ch;
}

/* ---- 读者场景 ---- */
.page-about .ab-reader-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(228px, 100%), 1fr));
  gap: 14px;
  margin-top: 30px;
}

.page-about .ab-reader {
  border: 1px solid var(--ab-line-soft);
  background: var(--ab-fill);
  padding: 18px 16px 20px;
}

.page-about .ab-reader-idx {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--gold);
  margin-bottom: 10px;
}

.page-about .ab-reader h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .ab-reader p {
  margin: 0;
  font-size: 14px;
  line-height: 1.68;
  color: rgba(244, 241, 232, .72);
}

/* ---- 字段顺序 ---- */
.page-about .ab-fields {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  border-top: 1px solid var(--ab-line-soft);
}

.page-about .ab-field {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 15px 0;
  border-bottom: 1px solid var(--ab-line-soft);
}

.page-about .ab-field-idx {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--gold);
}

.page-about .ab-field-name {
  display: block;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--paper);
  margin-bottom: 3px;
}

.page-about .ab-field p {
  margin: 0;
  font-size: 14px;
  line-height: 1.66;
  color: rgba(244, 241, 232, .7);
}

/* ---- 收尾 ---- */
.page-about .ab-cta {
  padding: 56px 0 62px;
}

.page-about .ab-cta h2 {
  margin: 0 0 14px;
  font-size: clamp(24px, 6vw, 36px);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -.015em;
}

.page-about .ab-cta p {
  margin: 0 0 26px;
  font-size: 15.5px;
  line-height: 1.72;
  color: rgba(244, 241, 232, .76);
  max-width: 58ch;
}

.page-about .ab-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---- 断点 ---- */
@media (min-width: 640px) {
  .page-about .ab-groups {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 768px) {
  .page-about .ab-partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 34px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-ver-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .ab-team-grid {
    grid-template-columns: 5fr 7fr;
    gap: 40px;
  }

  .page-about .ab-tl {
    margin-top: 44px;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-hero {
    padding-top: 46px;
  }

  .page-about .ab-hero-grid {
    grid-template-columns: 5fr 7fr;
    gap: 52px;
    align-items: start;
  }

  .page-about .ab-section {
    padding: 72px 0;
  }

  .page-about .ab-stat dd {
    font-size: 28px;
  }

  .page-about .ab-fields {
    margin-top: 36px;
  }

  .page-about .ab-field {
    grid-template-columns: 44px minmax(0, 1fr);
    padding: 18px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .reveal {
    transition: none;
  }
}