.page-about {
  --ab-rule: rgba(201, 154, 60, .22);
  --ab-gap: clamp(44px, 7vw, 92px);
  padding-bottom: clamp(56px, 8vw, 110px);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(30px, 6vw, 74px) 0 clamp(38px, 6vw, 80px);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-crimson), var(--c-gold), var(--c-turquoise), var(--c-indigo), var(--c-clay));
  opacity: .8;
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 54px);
  align-items: center;
}

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

.page-about .ab-hero__copy .breadcrumb {
  margin-bottom: 16px;
}

.page-about .ab-hero h1 {
  margin: 12px 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.85rem, 5.2vw, 3.1rem);
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--ink);
  max-width: 20ch;
}

.page-about .ab-hero__lead {
  margin: 0;
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 46ch;
}

.page-about .ab-hero__stats {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
}

.page-about .ab-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-right: 26px;
  border-right: 1px solid var(--hair);
}

.page-about .ab-hero__stats li:last-child {
  padding-right: 0;
  border-right: 0;
}

.page-about .ab-hero__num {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3.4vw, 1.9rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-gold);
  letter-spacing: -.02em;
}

.page-about .ab-hero__cap {
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-faint);
}

.page-about .ab-hero__visual svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 480px;
  margin-inline: auto;
  filter: drop-shadow(0 22px 46px rgba(0, 0, 0, .45));
}

/* ---------- 双栏骨架 ---------- */
.page-about .ab-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 50px);
}

@media (min-width: 1080px) {
  .page-about .ab-layout {
    grid-template-columns: 224px minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .ab-index {
  display: none;
}

@media (min-width: 1080px) {
  .page-about .ab-index {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 30px);
  }
}

.page-about .ab-index__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--ink-faint);
}

.page-about .ab-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border-left: 1px solid var(--hair);
}

.page-about .index-link {
  display: block;
  margin-left: -1px;
  padding: 9px 10px 9px 14px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink-soft);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color .22s var(--ease), border-color .22s var(--ease), background-color .22s var(--ease);
}

.page-about .index-link:hover {
  color: var(--ink);
  background: rgba(19, 30, 58, .5);
}

.page-about .index-link[aria-current]:not([aria-current="false"]) {
  color: var(--c-bright);
  border-left-color: var(--c-bright);
  background: rgba(19, 30, 58, .55);
}

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

.page-about .ab-sec {
  position: relative;
  min-width: 0;
}

.page-about .ab-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 16px;
}

.page-about .ab-sec__head::after {
  content: "";
  flex: 1 1 auto;
  min-width: 22px;
  height: 1px;
  align-self: center;
  background: var(--ab-rule);
}

.page-about .ab-sec__no {
  flex: none;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--c-gold);
}

.page-about .ab-sec h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.42rem, 3.4vw, 2.1rem);
  line-height: 1.32;
  color: var(--ink);
}

.page-about .ab-sec__lead {
  margin: 0 0 clamp(20px, 3vw, 32px);
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 58ch;
}

.page-about .ab-sec__tail {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-faint);
  max-width: 58ch;
}

.page-about .ab-sec__tail a {
  color: var(--c-bright);
  text-decoration: none;
  border-bottom: 1px solid rgba(73, 183, 158, .38);
  padding-bottom: 1px;
  transition: border-color .22s var(--ease), color .22s var(--ease);
}

.page-about .ab-sec__tail a:hover {
  color: var(--c-cream);
  border-bottom-color: var(--c-cream);
}

/* ---------- 01 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: 22px;
}

@media (min-width: 1240px) {
  .page-about .ab-team {
    grid-template-columns: minmax(0, 1fr) 292px;
    align-items: start;
  }
}

.page-about .ab-team__list {
  display: grid;
  gap: 12px;
}

.page-about .ab-member {
  position: relative;
  padding: 19px 22px 21px;
  border: 1px solid var(--hair-soft);
  border-left: 3px solid var(--c-turquoise);
  border-radius: var(--r-md);
  background: linear-gradient(150deg, rgba(19, 30, 58, .62), rgba(12, 14, 19, .3));
  transition: transform .26s var(--ease), border-color .26s var(--ease);
}

.page-about .ab-member:nth-child(2) {
  border-left-color: var(--c-gold);
}

.page-about .ab-member:nth-child(3) {
  border-left-color: var(--c-clay);
}

.page-about .ab-member:hover {
  transform: translateX(3px);
  border-color: rgba(201, 154, 60, .34);
}

.page-about .ab-member__no {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--ink-faint);
}

.page-about .ab-member h3 {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 9px;
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--ink);
}

.page-about .ab-member__count {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 400;
  letter-spacing: .06em;
  color: var(--c-bright);
  border: 1px solid rgba(73, 183, 158, .38);
  border-radius: 999px;
  padding: 2px 9px;
}

.page-about .ab-member p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--ink-soft);
}

.page-about .ab-team__figure {
  margin: 0;
  border: 1px solid var(--hair-soft);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .ab-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

/* ---------- 02 成稿流程 ---------- */
.page-about .ab-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .ab-flow li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 20px 20px 0;
  border-top: 1px solid var(--ab-rule);
}

.page-about .ab-flow li:last-child {
  border-bottom: 1px solid var(--ab-rule);
}

.page-about .ab-flow__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--c-stone);
  padding-top: 4px;
}

.page-about .ab-flow__body h3 {
  margin: 0 0 6px;
  font-size: 1.04rem;
  font-weight: 800;
  color: var(--ink);
}

.page-about .ab-flow__body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--ink-soft);
  max-width: 56ch;
}

/* ---------- 03 发展阶段 ---------- */
.page-about .ab-sec--phases {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-lg);
  background: var(--c-noir);
}

.page-about .ab-phases__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .22;
}

.page-about .ab-phases__inner {
  position: relative;
  padding: clamp(26px, 4vw, 46px) clamp(18px, 3vw, 40px) clamp(24px, 3.4vw, 40px);
  background: linear-gradient(165deg, rgba(12, 14, 19, .74), rgba(12, 14, 19, .92));
}

.page-about .ab-track {
  list-style: none;
  margin: 0;
  padding: 0 0 10px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(216px, 74%);
  gap: 12px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--c-stone) transparent;
}

@media (min-width: 760px) {
  .page-about .ab-track {
    grid-auto-columns: minmax(230px, 290px);
  }
}

.page-about .ab-track::-webkit-scrollbar {
  height: 6px;
}

.page-about .ab-track::-webkit-scrollbar-thumb {
  background: var(--c-stone);
  border-radius: 999px;
}

.page-about .ab-node {
  scroll-snap-align: start;
  padding: 20px 20px 22px;
  border: 1px solid var(--hair-soft);
  border-top: 3px solid var(--c-turquoise);
  border-radius: var(--r-md);
  background: rgba(19, 30, 58, .7);
}

.page-about .ab-node:nth-child(2) {
  border-top-color: var(--c-gold);
}

.page-about .ab-node:nth-child(3) {
  border-top-color: var(--c-clay);
}

.page-about .ab-node:nth-child(4) {
  border-top-color: var(--c-crimson);
}

.page-about .ab-node__badge {
  display: inline-block;
  margin-bottom: 11px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--c-bright);
  border: 1px solid rgba(73, 183, 158, .38);
  border-radius: 999px;
}

.page-about .ab-node h3 {
  margin: 0 0 8px;
  font-size: 1.06rem;
  font-weight: 800;
  color: var(--ink);
}

.page-about .ab-node p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 04 覆盖与响应 ---------- */
.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
  gap: 12px;
}

.page-about .ab-stat {
  position: relative;
  padding: 20px 18px 22px;
  border: 1px solid var(--hair-soft);
  border-radius: var(--r-md);
  background: linear-gradient(150deg, rgba(30, 124, 108, .26), rgba(12, 14, 19, .66));
  overflow: hidden;
  transition: transform .26s var(--ease), border-color .26s var(--ease);
}

.page-about .ab-stat::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--c-turquoise);
  opacity: .9;
}

.page-about .ab-stat--desktop {
  background: linear-gradient(150deg, rgba(19, 30, 58, .74), rgba(12, 14, 19, .66));
}

.page-about .ab-stat--desktop::before {
  background: var(--c-gold);
}

.page-about .ab-stat--visits {
  background: linear-gradient(150deg, rgba(142, 30, 39, .3), rgba(12, 14, 19, .66));
}

.page-about .ab-stat--visits::before {
  background: var(--c-crimson);
}

.page-about .ab-stat--compare {
  background: linear-gradient(150deg, rgba(178, 101, 63, .26), rgba(12, 14, 19, .66));
}

.page-about .ab-stat--compare::before {
  background: var(--c-clay);
}

.page-about .ab-stat:hover,
.page-about .ab-stat:focus-visible {
  transform: translateY(-3px);
  border-color: rgba(201, 154, 60, .46);
  outline: none;
}

.page-about .ab-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 4.4vw, 2.2rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--c-gold);
}

.page-about .ab-stat h3 {
  margin: 8px 0 0;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .ab-stat__more {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ink-faint);
}

@media (hover: hover) and (min-width: 720px) {
  .page-about .ab-stat__more {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height .3s var(--ease), opacity .25s var(--ease), margin-top .3s var(--ease);
  }

  .page-about .ab-stat:hover .ab-stat__more,
  .page-about .ab-stat:focus-visible .ab-stat__more {
    max-height: 160px;
    margin-top: 10px;
    opacity: 1;
  }
}

.page-about .ab-coverage__figure {
  margin: clamp(20px, 3vw, 30px) 0 0;
  border: 1px solid var(--hair-soft);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .ab-coverage__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 340px;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ---------- 05 协作与术语 ---------- */
.page-about .ab-terms {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 8px;
}

.page-about .ab-terms li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 13px 16px;
  border: 1px solid var(--hair-soft);
  border-radius: var(--r-sm);
  background: rgba(19, 30, 58, .42);
}

.page-about .ab-terms__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-moss);
}

.page-about .ab-terms__text {
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink-soft);
}

/* ---------- 06 承诺与联系 ---------- */
.page-about .ab-sec--support {
  padding: clamp(22px, 3.4vw, 34px) clamp(18px, 3vw, 32px) clamp(24px, 3.4vw, 36px);
  border: 1px solid var(--hair-soft);
  border-radius: var(--r-lg);
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(142, 30, 39, .26), transparent 62%),
    linear-gradient(160deg, rgba(19, 30, 58, .6), rgba(12, 14, 19, .72));
}

.page-about .ab-promise {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

@media (min-width: 680px) {
  .page-about .ab-promise {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .ab-promise__item {
  padding: 18px 20px 20px;
  border-left: 3px solid var(--c-gold);
  border-radius: var(--r-sm);
  background: rgba(12, 14, 19, .5);
}

.page-about .ab-promise__item:nth-child(2) {
  border-left-color: var(--c-turquoise);
}

.page-about .ab-promise__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4.6vw, 2.2rem);
  font-weight: 700;
  line-height: 1.05;
  color: var(--c-gold);
}

.page-about .ab-promise__item:nth-child(2) .ab-promise__num {
  color: var(--c-bright);
}

.page-about .ab-promise__unit {
  margin: 2px 0 10px;
  font-size: 14px;
  color: var(--ink);
}

.page-about .ab-promise__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .ab-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 2.6vw, 26px);
}

/* ---------- 降级动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .ab-member,
  .page-about .ab-stat,
  .page-about .index-link {
    transition: none;
  }

  .page-about .ab-member:hover,
  .page-about .ab-stat:hover,
  .page-about .ab-stat:focus-visible {
    transform: none;
  }

  .page-about .ab-track {
    scroll-snap-type: none;
  }
}