.page-about {
  --ab-rail: 224px;
  color: var(--lm-cream);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(2.25rem, 5vw, 4.5rem) clamp(2.25rem, 5vw, 4rem);
  background:
    radial-gradient(120% 90% at 12% 0%, rgba(255, 107, 53, 0.16), transparent 58%),
    radial-gradient(90% 80% at 100% 100%, rgba(0, 168, 150, 0.14), transparent 62%),
    linear-gradient(180deg, #14212F 0%, #0E1926 100%);
  border-bottom: 1px solid var(--lm-hair);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--lm-hair) 1px, transparent 1px),
    linear-gradient(to bottom, var(--lm-hair) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: 0.4;
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: center;
}

.page-about .ab-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin: 0 0 1rem;
  font-family: var(--lm-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--lm-mist);
}

.page-about .ab-hero__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--lm-orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.2);
  animation: ab-pulse 2.6s var(--lm-ease) infinite;
}

.page-about .ab-hero h1 {
  margin: 0 0 1.1rem;
  font-size: clamp(2.1rem, 5vw, 3.7rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--lm-white);
}

.page-about .ab-hero__lead {
  margin: 0 0 1.6rem;
  max-width: 46ch;
  font-size: 1.02rem;
  line-height: 1.8;
  color: var(--lm-cream);
}

.page-about .ab-hero__actions,
.page-about .ab-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.page-about .ab-hero__media {
  position: relative;
  margin: 0;
  border-radius: var(--lm-r);
  overflow: hidden;
  border: 1px solid var(--lm-hair-2);
  box-shadow: 0 34px 90px -34px rgba(0, 0, 0, 0.85);
}

.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1920 / 900;
  object-fit: cover;
}

.page-about .ab-hero__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 1.6rem 1.1rem 0.85rem;
  font-family: var(--lm-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--lm-cream);
  background: linear-gradient(180deg, transparent, rgba(14, 25, 38, 0.92));
}

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

@keyframes ab-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.45; }
}

/* ---------- 面包屑 ---------- */
.page-about .ab-crumbs {
  padding-top: 1.1rem;
}

.page-about .ab-crumbs .lm-crumbs {
  color: var(--lm-mist);
}

.page-about .ab-crumbs a {
  color: var(--lm-mist);
  text-decoration: none;
}

.page-about .ab-crumbs a:hover,
.page-about .ab-crumbs a:focus-visible {
  color: var(--lm-orange);
}

/* ---------- 双栏骨架 ---------- */
.page-about .ab-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 3vw, 2.5rem);
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
}

@media (min-width: 1000px) {
  .page-about .ab-layout {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: clamp(2.5rem, 5vw, 4.5rem);
    align-items: start;
  }
}

/* ---------- 章节索引 ---------- */
.page-about .ab-index {
  border: 1px solid var(--lm-hair);
  border-radius: var(--lm-r-sm);
  background: linear-gradient(180deg, rgba(14, 25, 38, 0.86), rgba(26, 42, 58, 0.55));
  padding: 0.95rem 1rem 1rem;
}

.page-about .ab-index__title {
  margin: 0;
  font-family: var(--lm-mono);
  font-size: 0.68rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--lm-mist);
}

.page-about .ab-index__list {
  display: flex;
  gap: 0.45rem;
  margin: 0.7rem 0 0;
  padding: 0 0 0.2rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .ab-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .ab-index__link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  white-space: nowrap;
  padding: 0.42rem 0.85rem;
  border: 1px solid var(--lm-hair);
  border-radius: var(--lm-pill);
  color: var(--lm-cream);
  font-size: 0.86rem;
  text-decoration: none;
  transition: color 0.22s var(--lm-ease), border-color 0.22s var(--lm-ease),
    background-color 0.22s var(--lm-ease);
}

.page-about .ab-index__num {
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: var(--lm-teal-soft);
}

.page-about .ab-index__link:hover,
.page-about .ab-index__link:focus-visible {
  border-color: var(--lm-orange);
  background: rgba(255, 107, 53, 0.12);
  color: var(--lm-white);
}

.page-about .ab-index__link:hover .ab-index__num,
.page-about .ab-index__link:focus-visible .ab-index__num {
  color: var(--lm-orange);
}

@media (min-width: 1000px) {
  .page-about .ab-index {
    position: sticky;
    top: 118px;
  }
  .page-about .ab-index__list {
    flex-direction: column;
    overflow: visible;
    margin-top: 0.85rem;
  }
  .page-about .ab-index__link {
    width: 100%;
    justify-content: flex-start;
    border-color: transparent;
    border-radius: var(--lm-r-sm);
    padding: 0.5rem 0.7rem;
  }
  .page-about .ab-index__link:hover,
  .page-about .ab-index__link:focus-visible {
    border-color: rgba(255, 107, 53, 0.4);
  }
}

/* ---------- 章节 ---------- */
.page-about .ab-section {
  padding-block: clamp(1.75rem, 4vw, 3rem);
  border-top: 1px solid var(--lm-hair);
}

.page-about .ab-section:first-child {
  border-top: 0;
  padding-top: clamp(1.5rem, 3vw, 2.5rem);
}

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

.page-about .ab-chapter {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  margin: 0 0 0.7rem;
}

.page-about .ab-chapter__num {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--lm-mist);
  transition: color 0.3s var(--lm-ease);
}

.page-about .ab-chapter__label {
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  color: var(--lm-mist);
}

.page-about .ab-section.is-active .ab-chapter__num {
  color: var(--lm-orange);
}

.page-about .ab-section.is-active .ab-chapter__label {
  color: var(--lm-cream);
}

.page-about .ab-section h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.45rem, 2.7vw, 2.1rem);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.015em;
  color: var(--lm-white);
}

.page-about .ab-lead {
  margin: 0 0 1.2rem;
  max-width: 60ch;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--lm-teal-soft);
}

.page-about .ab-prose p {
  margin: 0 0 1rem;
  max-width: 68ch;
  font-size: 1.02rem;
  line-height: 1.82;
  color: var(--lm-cream);
}

.page-about .ab-prose--tight p {
  margin-bottom: 0;
  font-size: 0.97rem;
  color: rgba(244, 241, 234, 0.9);
}

/* ---------- 事实条 ---------- */
.page-about .ab-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-fact {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--lm-hair);
  border-radius: var(--lm-r-sm);
  background: rgba(14, 25, 38, 0.6);
}

.page-about .ab-fact__num {
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--lm-orange);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-fact--amber .ab-fact__num {
  color: var(--lm-amber);
}

.page-about .ab-fact__label {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--lm-mist);
}

@media (min-width: 700px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 时间线 ---------- */
.page-about .ab-timeline {
  margin: 1.5rem 0 0 0.35rem;
  padding: 0 0 0 0.2rem;
  list-style: none;
  border-left: 1px solid var(--lm-hair-2);
}

.page-about .ab-node {
  position: relative;
  padding: 0 0 clamp(1.4rem, 3vw, 2.1rem) 1.6rem;
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5rem;
  width: 11px;
  height: 11px;
  transform: translateX(-50%);
  border-radius: 50%;
  background: var(--lm-orange);
  box-shadow: 0 0 0 5px rgba(255, 107, 53, 0.16);
}

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

.page-about .ab-node__year {
  margin: 0;
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--lm-orange);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-node__title {
  margin: 0.3rem 0 0;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--lm-white);
}

.page-about .ab-node__desc {
  margin: 0.4rem 0 0;
  max-width: 54ch;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--lm-mist);
}

@media (hover: hover) and (min-width: 760px) {
  .page-about .ab-node__desc {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.36s var(--lm-ease), opacity 0.3s var(--lm-ease),
      margin-top 0.3s var(--lm-ease);
  }
  .page-about .ab-node:hover .ab-node__desc,
  .page-about .ab-node:focus-within .ab-node__desc {
    max-height: 12rem;
    margin-top: 0.4rem;
    opacity: 1;
  }
}

.page-about .ab-node--media {
  padding-block: 0.4rem 1.6rem;
}

.page-about .ab-node--media::before {
  background: var(--lm-teal);
  box-shadow: 0 0 0 5px rgba(0, 168, 150, 0.16);
}

/* ---------- 配图 ---------- */
.page-about .ab-figure {
  margin: 0;
  border-radius: var(--lm-r-sm);
  overflow: hidden;
  border: 1px solid var(--lm-hair);
  background: rgba(14, 25, 38, 0.6);
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1200 / 800;
  object-fit: cover;
}

.page-about .ab-figure--wide {
  margin-top: 1.6rem;
  border-radius: var(--lm-r);
}

.page-about .ab-figure--wide img {
  aspect-ratio: 1400 / 1000;
}

.page-about .ab-figure__caption {
  padding: 0.65rem 0.9rem 0.75rem;
  font-family: var(--lm-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: var(--lm-mist);
  border-top: 1px solid var(--lm-hair);
}

/* ---------- 团队卡片 ---------- */
.page-about .ab-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.8rem;
  margin: 1.5rem 0;
}

.page-about .ab-card {
  position: relative;
  padding: 1.2rem 1.15rem 1.25rem;
  border-radius: var(--lm-r);
  border: 1px solid var(--lm-hair);
  background: linear-gradient(180deg, rgba(14, 25, 38, 0.85), rgba(26, 42, 58, 0.5));
}

.page-about .ab-card--light {
  background: var(--lm-cream);
  border-color: transparent;
}

.page-about .ab-card--teal {
  border-color: rgba(0, 168, 150, 0.45);
  background: linear-gradient(180deg, rgba(0, 168, 150, 0.16), rgba(14, 25, 38, 0.7));
}

.page-about .ab-card__tag {
  display: inline-block;
  margin: 0 0 0.75rem;
  padding: 0.24rem 0.7rem;
  border: 1px solid var(--lm-hair-2);
  border-radius: var(--lm-pill);
  font-family: var(--lm-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--lm-mist);
}

.page-about .ab-card--light .ab-card__tag {
  border-color: rgba(26, 42, 58, 0.24);
  color: #4B5B6E;
}

.page-about .ab-card--teal .ab-card__tag {
  border-color: rgba(95, 224, 208, 0.5);
  color: var(--lm-teal-soft);
}

.page-about .ab-card__num {
  margin: 0 0 0.55rem;
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--lm-orange);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-card--light .ab-card__num {
  color: #1A2A3A;
}

.page-about .ab-card--teal .ab-card__num {
  color: var(--lm-teal-soft);
}

.page-about .ab-card__unit {
  margin-left: 0.25em;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--lm-mist);
}

.page-about .ab-card__text {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.72;
  color: var(--lm-cream);
}

.page-about .ab-card--light .ab-card__text {
  color: #2C3D4F;
}

@media (min-width: 760px) {
  .page-about .ab-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 合作网络 ---------- */
.page-about .ab-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.8rem;
  margin-top: 1.4rem;
}

.page-about .ab-partner {
  position: relative;
  padding: 1.15rem 1.15rem 1.2rem 1.45rem;
  border-radius: var(--lm-r-sm);
  border: 1px solid var(--lm-hair);
  background: rgba(14, 25, 38, 0.6);
}

.page-about .ab-partner::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.2rem;
  bottom: 1.2rem;
  width: 3px;
  border-radius: var(--lm-pill);
  background: var(--lm-teal);
}

.page-about .ab-partner__num {
  margin: 0;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--lm-teal-soft);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-partner__name {
  margin: 0.2rem 0 0.4rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--lm-white);
}

.page-about .ab-partner__desc {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--lm-mist);
}

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

/* ---------- 年鉴 ---------- */
.page-about .ab-yearbook {
  margin-top: 1.6rem;
  padding: 1.3rem 1.25rem 1.4rem;
  border-radius: var(--lm-r);
  border: 1px solid rgba(255, 209, 102, 0.32);
  background: linear-gradient(135deg, rgba(255, 209, 102, 0.1), rgba(14, 25, 38, 0.72));
}

.page-about .ab-yearbook__label {
  margin: 0 0 0.55rem;
  font-family: var(--lm-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--lm-amber);
}

.page-about .ab-yearbook__text {
  margin: 0;
  max-width: 62ch;
  font-size: 0.98rem;
  line-height: 1.78;
  color: var(--lm-cream);
}

/* ---------- 结尾 ---------- */
.page-about .ab-section--last .ab-actions {
  margin-top: 1.6rem;
}

/* ---------- 显现动效 ---------- */
.page-about [data-reveal] {
  transition: opacity 0.42s var(--lm-ease), transform 0.42s var(--lm-ease);
}

.lm-js .page-about [data-reveal]:not(.is-in) {
  opacity: 0;
  transform: translateY(18px);
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about .ab-node__desc {
    transition: none;
  }
  .lm-js .page-about [data-reveal]:not(.is-in) {
    opacity: 1;
    transform: none;
  }
  .page-about .ab-hero__dot {
    animation: none;
  }
}