.page-about {
  --ab-line: rgba(16, 20, 24, 0.16);
  --ab-line-light: rgba(242, 237, 228, 0.2);
  --ab-gap: clamp(1.5rem, 3vw, 2.5rem);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  background-color: var(--ice-night);
  background-image:
    radial-gradient(ellipse 62% 58% at 84% 6%, rgba(53, 242, 194, 0.13), transparent 62%),
    radial-gradient(ellipse 58% 52% at 4% 94%, rgba(240, 74, 42, 0.18), transparent 62%);
  color: var(--snow);
  padding-bottom: 0;
}

.page-about .ab-hero__crumbs {
  padding-top: calc(var(--header-h) + 1.25rem);
  margin-bottom: clamp(1.5rem, 4vw, 2.75rem);
}

.page-about .ab-hero__crumbs .breadcrumbs__link,
.page-about .ab-hero__crumbs .breadcrumbs__sep {
  color: rgba(242, 237, 228, 0.68);
}

.page-about .ab-hero__crumbs .breadcrumbs__current {
  color: var(--ember);
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: end;
  padding-bottom: clamp(2rem, 5vw, 3.5rem);
}

.page-about .ab-hero__copy .eyebrow {
  color: var(--mint);
}

.page-about .ab-hero h1 {
  margin: 0.35rem 0 1rem;
  max-width: 15ch;
  color: var(--snow);
}

.page-about .ab-hero .lede {
  max-width: 46ch;
  color: rgba(242, 237, 228, 0.82);
  font-size: clamp(0.98rem, 1.6vw, 1.08rem);
  line-height: 1.8;
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.6rem;
}

.page-about .ab-hero__media {
  margin: 0;
  border: 3px solid rgba(242, 237, 228, 0.24);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .ab-hero__media .media-frame__caption {
  color: rgba(242, 237, 228, 0.66);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
}

/* ---------- 记分板条 ---------- */
.page-about .ab-scoreboard {
  border-top: 2px solid var(--ab-line-light);
  background: rgba(14, 42, 68, 0.6);
}

.page-about .ab-scoreboard__inner {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .ab-scoreboard__item {
  padding: 1.1rem clamp(0.75rem, 2.4vw, 1.6rem);
  border-right: 1px solid var(--ab-line-light);
  border-bottom: 1px solid var(--ab-line-light);
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.page-about .ab-scoreboard__item:nth-child(2n) {
  border-right: 0;
}

.page-about .ab-scoreboard__num {
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  font-weight: 700;
  line-height: 1;
  color: var(--snow);
  letter-spacing: -0.02em;
}

.page-about .ab-scoreboard__unit {
  font-size: 0.55em;
  margin-left: 0.15em;
  color: var(--mint);
}

.page-about .ab-scoreboard__label {
  font-size: 0.78rem;
  color: rgba(242, 237, 228, 0.68);
  letter-spacing: 0.02em;
}

/* ---------- 两栏主体 ---------- */
.page-about .ab-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--ab-gap);
  padding-top: clamp(2rem, 5vw, 4rem);
  padding-bottom: clamp(2.5rem, 6vw, 5rem);
  background: var(--cream);
}

.page-about .ab-rail__inner {
  display: grid;
  gap: 0.9rem;
}

.page-about .ab-rail__panel {
  background: var(--snow);
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  box-shadow: 4px 4px 0 rgba(16, 20, 24, 0.12);
  padding: 0.95rem 1rem;
}

.page-about .ab-rail__panel--status {
  border-color: var(--rink-blue);
}

.page-about .ab-rail__title {
  margin: 0 0 0.4rem;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--rock);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.page-about .ab-rail__version {
  margin: 0 0 0.3rem;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--ice-night);
}

.page-about .ab-rail__meta {
  margin: 0;
  font-size: 0.8rem;
  line-height: 1.65;
  color: var(--rock);
}

.page-about .ab-rail__link {
  display: inline-block;
  margin-top: 0.6rem;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--flare-ink);
  text-decoration: none;
  border-bottom: 2px solid var(--flare);
  padding-bottom: 1px;
}

.page-about .ab-rail__link:hover {
  color: var(--ice-night);
  border-bottom-color: var(--ice-night);
}

.page-about .ab-rail__nav {
  background: var(--polar-night);
  border: 2px solid var(--ice-night);
  border-radius: var(--radius);
  padding: 0.95rem 1rem;
}

.page-about .ab-rail__nav .ab-rail__title {
  color: rgba(242, 237, 228, 0.6);
}

.page-about .ab-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.1rem;
}

.page-about .ab-rail__anchor {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.42rem 0;
  font-size: 0.86rem;
  color: rgba(242, 237, 228, 0.86);
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 237, 228, 0.12);
  transition: color var(--dur-fast) var(--ease), padding-left var(--dur-fast) var(--ease);
}

.page-about .ab-rail__anchor .mono {
  font-size: 0.72rem;
  color: var(--ember);
}

.page-about .ab-rail__anchor:hover,
.page-about .ab-rail__anchor:focus-visible {
  color: var(--mint);
  padding-left: 0.25rem;
}

/* ---------- 章节卡 ---------- */
.page-about .ab-main {
  display: grid;
  gap: var(--ab-gap);
  min-width: 0;
}

.page-about .ab-chapter {
  background: var(--snow);
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard-light);
  padding: clamp(1.25rem, 3.2vw, 2.25rem);
  scroll-margin-top: calc(var(--header-h) + 1.5rem);
}

.page-about .ab-chapter__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 0.9rem;
}

.page-about .ab-chapter__head .h-section {
  margin: 0;
  flex: 1 1 14ch;
  min-width: 0;
}

.page-about .ab-chapter__text {
  margin: 0 0 1rem;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--ink);
  max-width: 62ch;
}

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

.page-about .ab-chapter__text--tight {
  margin-top: 1.25rem;
  font-size: 0.88rem;
  color: var(--rock);
}

/* 深色章节 */
.page-about .ab-chapter--dark {
  background: var(--ice-night);
  border-color: var(--ice-night);
  color: var(--snow);
  background-image: radial-gradient(ellipse 70% 60% at 92% 0%, rgba(240, 74, 42, 0.16), transparent 60%);
}

.page-about .ab-chapter--dark .h-section,
.page-about .ab-chapter--dark .h-sub {
  color: var(--snow);
}

.page-about .ab-chapter--dark .ab-chapter__text {
  color: rgba(242, 237, 228, 0.82);
}

/* 冰面蓝章节 */
.page-about .ab-chapter--rink {
  background: var(--polar-night);
  border-color: var(--ice-night);
  color: var(--snow);
  background-image: radial-gradient(ellipse 66% 60% at 6% 100%, rgba(53, 242, 194, 0.12), transparent 60%);
}

.page-about .ab-chapter--rink .h-section {
  color: var(--snow);
}

.page-about .ab-chapter--rink .ab-chapter__text {
  color: rgba(242, 237, 228, 0.82);
}

.page-about .ab-chapter--rink .c-btn--flare {
  margin-top: 0.6rem;
}

/* ---------- 事实列表 ---------- */
.page-about .ab-facts {
  list-style: none;
  margin: 1.2rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.65rem;
  border-top: 2px dashed var(--clay);
  padding-top: 1rem;
}

.page-about .ab-facts__item {
  display: flex;
  gap: 0.6rem;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .ab-facts__mark {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  margin-top: 0.55rem;
  background: var(--clay);
  transform: rotate(45deg);
}

/* ---------- 方法矩阵 ---------- */
.page-about .ab-method {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.85rem;
  margin: 1.4rem 0;
}

.page-about .ab-method__item {
  border: 2px solid rgba(242, 237, 228, 0.24);
  border-radius: var(--radius);
  background: rgba(23, 74, 107, 0.42);
  padding: 1rem 1.05rem;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .ab-method__item:hover {
  border-color: var(--ember);
  transform: translateY(-2px);
}

.page-about .ab-method__num {
  display: block;
  font-size: clamp(1.5rem, 3.2vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--mint);
  letter-spacing: -0.02em;
  margin-bottom: 0.55rem;
}

.page-about .ab-method__num:has(+ .h-sub) {
  color: var(--ember);
}

.page-about .ab-method__unit {
  font-size: 0.5em;
  margin-left: 0.1em;
}

.page-about .ab-method__item .h-sub {
  margin: 0 0 0.4rem;
  font-size: 1rem;
}

.page-about .ab-method__item p {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.72;
  color: rgba(242, 237, 228, 0.76);
}

/* ---------- 引文块 ---------- */
.page-about .ab-quote {
  margin: 1.4rem 0 0;
  padding: 1rem 1.1rem 1rem 1.35rem;
  border-left: 5px solid var(--clay);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: rgba(182, 107, 74, 0.14);
}

.page-about .ab-quote p {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: clamp(1.02rem, 2vw, 1.2rem);
  font-weight: 600;
  line-height: 1.6;
  color: var(--snow);
}

.page-about .ab-quote__by {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--ember);
}

/* ---------- 团队 ---------- */
.page-about .ab-team-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
  margin-top: 1.1rem;
}

.page-about .ab-shot {
  margin: 0;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--rink-blue);
}

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

.page-about .ab-shot__caption {
  display: block;
  padding: 0.5rem 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.02em;
  color: rgba(242, 237, 228, 0.78);
  background: var(--polar-night);
  border-top: 2px solid var(--ink);
}

.page-about .ab-shot--wide {
  margin: 1.25rem 0;
}

.page-about .ab-teams {
  display: grid;
  gap: 0;
  align-content: start;
}

.page-about .ab-team {
  border-bottom: 2px solid var(--ab-line);
}

.page-about .ab-team:first-child {
  border-top: 2px solid var(--ab-line);
}

.page-about .ab-team__summary {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem;
  padding: 0.85rem 0;
  cursor: pointer;
  list-style: none;
}

.page-about .ab-team__summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-team__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--clay);
}

.page-about .ab-team[open] .ab-team__summary::after {
  content: "–";
  color: var(--flare);
}

.page-about .ab-team__name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--ice-night);
}

.page-about .ab-team__body {
  margin: 0 0 1rem;
  font-size: 0.88rem;
  line-height: 1.78;
  color: var(--rock);
  max-width: 54ch;
}

.page-about .ab-tagset {
  margin-top: 1.4rem;
  padding-top: 1.1rem;
  border-top: 2px dashed var(--moss);
}

.page-about .ab-tagset__title {
  margin: 0 0 0.7rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--rock);
}

.page-about .ab-tagset__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: 0.5rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.page-about .ab-timeline__item {
  position: relative;
  padding: 0 0 1.4rem 1.7rem;
  border-left: 2px solid var(--ab-line);
}

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

.page-about .ab-timeline__dot {
  position: absolute;
  left: -7px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--clay);
  border: 2px solid var(--snow);
}

.page-about .ab-timeline__item--current .ab-timeline__dot {
  background: var(--flare);
  box-shadow: 0 0 0 4px rgba(240, 74, 42, 0.2);
}

.page-about .ab-timeline__year {
  display: block;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1;
  color: var(--ice-night);
  letter-spacing: -0.01em;
}

.page-about .ab-timeline__item--current .ab-timeline__year {
  color: var(--flare-ink);
}

.page-about .ab-timeline__text {
  margin: 0.35rem 0 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--rock);
  max-width: 34ch;
}

.page-about .ab-timeline__now {
  margin-top: 0.55rem;
  display: inline-block;
}

/* ---------- 生态 ---------- */
.page-about .ab-network {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
  margin: 1.3rem 0;
}

.page-about .ab-network__stat {
  border: 2px solid rgba(242, 237, 228, 0.22);
  border-radius: var(--radius);
  background: rgba(7, 26, 43, 0.42);
  padding: 0.85rem 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.page-about .ab-network__num {
  font-size: clamp(1.4rem, 3vw, 1.85rem);
  font-weight: 700;
  line-height: 1;
  color: var(--mint);
}

.page-about .ab-network__label {
  font-size: 0.76rem;
  line-height: 1.5;
  color: rgba(242, 237, 228, 0.72);
}

.page-about .ab-matrix {
  position: relative;
  height: 108px;
  border: 2px solid rgba(242, 237, 228, 0.22);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: rgba(7, 26, 43, 0.4);
  background-image: radial-gradient(circle, rgba(124, 140, 106, 0.9) 1.8px, transparent 2.4px);
  background-size: 17px 17px;
  background-position: 6px 6px;
}

.page-about .ab-matrix__glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 46% 70% at 78% 20%, rgba(240, 74, 42, 0.34), transparent 70%);
  pointer-events: none;
}

.page-about .ab-matrix__caption {
  margin: 0.55rem 0 1rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.02em;
  color: rgba(242, 237, 228, 0.6);
}

/* ---------- 联系 ---------- */
.page-about .ab-contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.9rem;
  margin: 1.2rem 0;
}

.page-about .ab-contact__item {
  border: 2px solid var(--ab-line);
  border-radius: var(--radius);
  padding: 0.95rem 1rem;
  background: var(--cream);
  min-width: 0;
}

.page-about .ab-contact__label {
  margin: 0 0 0.5rem;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--rock);
}

.page-about .ab-contact__address {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  font-weight: 600;
  color: var(--ice-night);
}

.page-about .ab-contact__note {
  margin: 0.5rem 0 0;
  font-size: 0.78rem;
  line-height: 1.65;
  color: var(--rock);
}

.page-about .ab-contact__link {
  display: inline-block;
  margin-top: 0.6rem;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--flare-ink);
  text-decoration: none;
  border-bottom: 2px solid var(--flare);
}

.page-about .ab-contact__link:hover {
  color: var(--ice-night);
  border-bottom-color: var(--ice-night);
}

.page-about .ab-contact .copy-chip {
  width: 100%;
  max-width: 100%;
  min-height: 44px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.6rem;
  text-align: left;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background: var(--snow);
  padding: 0.55rem 0.7rem;
  cursor: pointer;
  transition: box-shadow var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}

.page-about .ab-contact .copy-chip:hover {
  box-shadow: 3px 3px 0 rgba(240, 74, 42, 0.5);
  transform: translate(-1px, -1px);
}

.page-about .copy-chip__value {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--ice-night);
  word-break: break-all;
}

.page-about .copy-chip__hint {
  margin-left: auto;
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--rock);
}

.page-about .copy-chip[data-copied="true"] .copy-chip__hint {
  color: var(--flare-ink);
  font-weight: 700;
}

/* ---------- 底部 CTA 条 ---------- */
.page-about .ab-cta-strip {
  margin-top: 1.3rem;
  padding: 1.1rem 1.15rem;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background: var(--flate, var(--flate));
  background: linear-gradient(120deg, rgba(240, 74, 42, 0.16), rgba(53, 242, 194, 0.12));
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.7rem;
}

.page-about .ab-cta-strip__text {
  margin: 0;
  flex: 1 1 16ch;
  min-width: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  font-weight: 600;
  color: var(--ice-night);
}

.page-about .ab-cta-strip .c-btn {
  flex: 0 0 auto;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .ab-scoreboard__item:nth-child(2n) {
    border-right: 1px solid var(--ab-line-light);
  }

  .page-about .ab-scoreboard__item:nth-child(2n) {
    border-right: 0;
  }

  .page-about .ab-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-network {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .ab-scoreboard__inner {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-scoreboard__item {
    border-bottom: 0;
  }

  .page-about .ab-scoreboard__item:nth-child(2n) {
    border-right: 1px solid var(--ab-line-light);
  }

  .page-about .ab-scoreboard__item:last-child {
    border-right: 0;
  }

  .page-about .ab-method {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-team-layout {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
    gap: 1.5rem;
  }

  .page-about .ab-timeline {
    flex-direction: row;
    gap: 1rem;
    margin-top: 1.4rem;
  }

  .page-about .ab-timeline__item {
    flex: 1 1 0;
    min-width: 0;
    padding: 1.6rem 0 0 0;
    border-left: 0;
    border-top: 2px solid var(--ab-line);
  }

  .page-about .ab-timeline__item:last-child {
    border-top-color: var(--ab-line);
  }

  .page-about .ab-timeline__dot {
    left: 0;
    top: -7px;
  }

  .page-about .ab-timeline__text {
    max-width: none;
  }
}

@media (min-width: 900px) {
  .page-about .ab-body {
    grid-template-columns: minmax(0, 236px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-rail__inner {
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
  }

  .page-about .ab-chapter {
    padding: clamp(1.6rem, 2.6vw, 2.4rem);
  }
}

@media (min-width: 1100px) {
  .page-about .ab-method {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-method__item,
  .page-about .ab-rail__anchor,
  .page-about .ab-contact .copy-chip {
    transition: none;
  }

  .page-about .ab-method__item:hover,
  .page-about .ab-contact .copy-chip:hover {
    transform: none;
  }

  .page-about .status-dot--live {
    animation: none;
  }
}
<<<END>>>

.page-about {
  --flate: transparent;
}