.page-about {
  --ab-rail-w: 248px;
  --ab-gap: clamp(28px, 4.5vw, 64px);
  --ab-cut: 18px;
  background: var(--gw-wall);
  color: var(--gw-ink);
}

.page-about .ab-crumb {
  padding-top: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gw-line);
}

.page-about .ab-crumb a {
  color: var(--gw-line);
  text-decoration: none;
}

.page-about .ab-crumb a:hover {
  color: var(--gw-flame-deep);
}

.page-about .ab-crumb__sep {
  color: var(--gw-brick);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  margin-top: 16px;
  overflow: hidden;
  background-color: var(--gw-night);
  background-image:
    repeating-linear-gradient(115deg, rgba(232, 226, 216, 0.055) 0 1px, transparent 1px 15px),
    radial-gradient(120% 95% at 12% -25%, rgba(225, 84, 28, 0.32), transparent 62%);
  border-bottom: 3px solid var(--gw-flame);
  padding: clamp(38px, 6vw, 78px) 0 clamp(40px, 6vw, 84px);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  right: -70px;
  top: -50px;
  width: 200px;
  height: 340px;
  background-image: repeating-linear-gradient(115deg, rgba(225, 84, 28, 0.55) 0 4px, transparent 4px 16px);
  transform: rotate(12deg);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__eyebrow {
  color: var(--gw-signal);
}

.page-about .ab-hero__title {
  margin: 14px 0 0;
  color: var(--gw-score);
}

.page-about .ab-hero__lede {
  margin-top: 20px;
  max-width: 40em;
  color: var(--gw-mute-dark);
  font-size: clamp(1rem, 1.6vw, 1.1rem);
  line-height: 1.8;
}

.page-about .ab-facts {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(232, 226, 216, 0.2);
  border: 1px solid rgba(232, 226, 216, 0.2);
}

.page-about .ab-fact {
  background: var(--gw-night);
  padding: 16px 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .ab-fact__num {
  font-family: var(--gw-font-num);
  font-weight: 700;
  font-size: clamp(1.55rem, 4.2vw, 2.25rem);
  line-height: 1;
  color: var(--gw-signal);
}

.page-about .ab-fact__label {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gw-mute-dark);
}

/* ---------- 双栏骨架 ---------- */
.page-about .ab-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding-top: clamp(32px, 5vw, 64px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .ab-rail {
  border-top: 3px solid var(--gw-flame);
  padding-top: 14px;
}

.page-about .ab-rail__cap {
  color: var(--gw-line);
}

.page-about .ab-rail__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .ab-rail__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 9px 12px;
  white-space: nowrap;
  font-size: 13px;
  text-decoration: none;
  color: var(--gw-ink-soft);
  border-bottom: 3px solid transparent;
  transition: color 0.18s ease-out, border-color 0.18s ease-out, background-color 0.18s ease-out;
}

.page-about .ab-rail__link:hover {
  color: var(--gw-ink);
  background: rgba(198, 187, 169, 0.36);
}

.page-about .ab-rail__link.is-active,
.page-about .ab-rail__link.is-current {
  color: var(--gw-ink);
  font-weight: 700;
  border-bottom-color: var(--gw-flame);
  background: rgba(225, 84, 28, 0.08);
}

.page-about .ab-rail__idx {
  font-family: var(--gw-font-num);
  font-weight: 700;
  font-size: 11px;
  color: var(--gw-flame-deep);
}

/* ---------- 章节 ---------- */
.page-about .ab-sec {
  scroll-margin-top: calc(var(--gw-topbar-h) + 28px);
}

.page-about .ab-sec + .ab-sec {
  margin-top: clamp(42px, 6vw, 80px);
}

.page-about .ab-sec + .ab-sec::before {
  content: "";
  display: block;
  height: 10px;
  margin-bottom: clamp(26px, 3.5vw, 40px);
  background-image: repeating-linear-gradient(112deg, var(--gw-brick) 0 5px, transparent 5px 13px);
}

.page-about .ab-sec__head {
  margin-bottom: 20px;
}

.page-about .ab-sec__no {
  color: var(--gw-flame-deep);
}

.page-about .ab-sec .gw-h2 {
  margin: 10px 0 0;
}

.page-about .ab-prose {
  max-width: 40em;
}

.page-about .ab-prose p {
  margin: 0 0 1.05em;
}

.page-about .ab-note {
  margin-top: 26px;
  padding: 16px 20px;
  max-width: 40em;
  background: var(--gw-score);
  border: 1px solid var(--gw-brick);
  border-left: 3px solid var(--gw-signal);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--ab-cut)), calc(100% - var(--ab-cut)) 100%, 0 100%);
  font-size: 14px;
  line-height: 1.75;
  color: var(--gw-ink-soft);
}

.page-about .ab-note p {
  margin: 0;
}

/* ---------- 团队 ---------- */
.page-about .ab-team__media {
  margin: 0 0 26px;
}

.page-about .ab-team__media img {
  border: 1px solid var(--gw-brick);
}

.page-about .ab-roles {
  margin-top: 28px;
  display: grid;
  gap: 1px;
  background: var(--gw-brick);
  border: 1px solid var(--gw-brick);
}

.page-about .ab-role {
  position: relative;
  background: var(--gw-score);
  padding: 22px 18px 24px;
}

.page-about .ab-role::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--gw-signal);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.22s ease-out;
}

.page-about .ab-role:hover::before {
  transform: scaleY(1);
}

.page-about .ab-role__idx {
  font-family: var(--gw-font-num);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--gw-flame-deep);
}

.page-about .ab-role__name {
  margin: 10px 0 8px;
  font-family: var(--gw-font-display);
  font-weight: 600;
  font-size: 1.2rem;
  letter-spacing: 0.03em;
}

.page-about .ab-role__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--gw-ink-soft);
}

/* ---------- 流程 ---------- */
.page-about .ab-steps {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--gw-brick);
  border: 1px solid var(--gw-brick);
}

.page-about .ab-step {
  background: var(--gw-wall);
  padding: 20px 18px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
}

.page-about .ab-step__n {
  font-family: var(--gw-font-num);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--gw-flame);
  line-height: 1.5;
}

.page-about .ab-step__t {
  margin: 0 0 6px;
  font-family: var(--gw-font-display);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.03em;
}

.page-about .ab-step__d {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--gw-ink-soft);
}

.page-about .ab-deep {
  margin-top: 28px;
  padding: clamp(24px, 4vw, 38px);
  background: var(--gw-pitch);
  color: var(--gw-score);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
  display: grid;
  gap: 8px;
}

.page-about .ab-deep__eyebrow {
  color: var(--gw-mute-dark);
}

.page-about .ab-deep__num {
  margin: 0;
  font-size: clamp(2.4rem, 8vw, 3.6rem);
  color: var(--gw-signal);
  line-height: 1;
}

.page-about .ab-deep__text {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--gw-mute-dark);
}

/* ---------- 社区 ---------- */
.page-about .ab-comm {
  display: grid;
  gap: 24px;
}

.page-about .ab-comm__stats {
  list-style: none;
  margin: 24px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--gw-brick);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.page-about .ab-comm__stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .ab-comm__num {
  font-size: clamp(1.6rem, 5vw, 2.1rem);
  color: var(--gw-flame-deep);
  line-height: 1;
}

.page-about .ab-comm__cap {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gw-line);
}

.page-about .ab-comm__link {
  margin: 22px 0 0;
  font-size: 14px;
}

.page-about .ab-comm__link a {
  color: var(--gw-flame-deep);
  text-decoration: none;
  border-bottom: 2px solid var(--gw-flame);
  padding-bottom: 2px;
}

.page-about .ab-comm__link a:hover {
  color: var(--gw-ink);
  border-bottom-color: var(--gw-ink);
}

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

.page-about .ab-comm__media img {
  border: 1px solid var(--gw-brick);
}

/* ---------- 节点 ---------- */
.page-about .ab-nodefig {
  margin: 0 0 28px;
}

.page-about .ab-nodefig img {
  border: 1px solid var(--gw-brick);
  background: var(--gw-score);
}

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

.page-about .ab-nodes::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 26px;
  bottom: 26px;
  width: 2px;
  background: var(--gw-brick);
}

.page-about .ab-node {
  position: relative;
  padding-left: 34px;
}

.page-about .ab-node + .ab-node {
  margin-top: 4px;
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 24px;
  width: 14px;
  height: 14px;
  background: var(--gw-score);
  border: 3px solid var(--gw-flame);
}

.page-about .ab-node__d {
  border-bottom: 1px solid var(--gw-brick);
}

.page-about .ab-node__sum {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px 14px;
  align-items: baseline;
  padding: 18px 4px 18px 0;
}

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

.page-about .ab-node__sum:focus-visible {
  outline: 2px solid var(--gw-flame);
  outline-offset: 2px;
}

.page-about .ab-node__year {
  grid-column: 1;
  font-family: var(--gw-font-num);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gw-flame-deep);
}

.page-about .ab-node__title {
  grid-column: 1;
  font-family: var(--gw-font-display);
  font-weight: 600;
  font-size: clamp(1.1rem, 3vw, 1.35rem);
  letter-spacing: 0.02em;
  color: var(--gw-ink);
}

.page-about .ab-node__mark {
  grid-column: 2;
  grid-row: 1 / span 2;
  align-self: center;
  width: 14px;
  height: 14px;
  position: relative;
  transition: transform 0.22s ease-out;
}

.page-about .ab-node__mark::before,
.page-about .ab-node__mark::after {
  content: "";
  position: absolute;
  background: var(--gw-flame);
}

.page-about .ab-node__mark::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-about .ab-node__mark::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
}

.page-about .ab-node__d[open] .ab-node__mark {
  transform: rotate(90deg);
}

.page-about .ab-node__panel {
  padding: 0 4px 22px 0;
}

.page-about .ab-node__panel p {
  margin: 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--gw-ink-soft);
}

/* ---------- 收尾 ---------- */
.page-about .ab-cta {
  background-color: var(--gw-pitch);
  background-image: repeating-linear-gradient(115deg, rgba(232, 226, 216, 0.05) 0 1px, transparent 1px 15px);
  color: var(--gw-score);
  padding: clamp(36px, 6vw, 68px) 0;
  border-top: 3px solid var(--gw-flame);
}

.page-about .ab-cta__eyebrow {
  color: var(--gw-signal);
}

.page-about .ab-cta__title {
  margin: 12px 0 0;
  color: var(--gw-score);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 860px) {
  .page-about .ab-comm {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(28px, 4vw, 48px);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .ab-layout {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: var(--ab-gap);
  }

  .page-about .ab-rail {
    position: sticky;
    top: calc(var(--gw-topbar-h) + 28px);
    align-self: start;
  }

  .page-about .ab-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    margin-top: 14px;
  }

  .page-about .ab-rail__link {
    white-space: normal;
    border-bottom: 0;
    border-left: 3px solid transparent;
    line-height: 1.5;
  }

  .page-about .ab-rail__link.is-active,
  .page-about .ab-rail__link.is-current {
    border-left-color: var(--gw-flame);
    border-bottom-color: transparent;
  }
}