.page-about {
  --ab-hair: rgba(60, 71, 68, .34);
  --ab-hair-dark: rgba(243, 238, 228, .2);
  --ab-ink-soft: #3C4744;
}

.page-about .section__inner {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 3.25rem 1.25rem;
  box-sizing: border-box;
}

@media (min-width: 768px) {
  .page-about .section__inner {
    padding: 5rem 2.5rem;
  }
}

@media (min-width: 1080px) {
  .page-about .section__inner {
    padding: 6.5rem 3.5rem;
  }
}

.page-about .index-label {
  display: block;
  margin: 0 0 1.5rem;
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--moss);
}

.page-about .section--dark .index-label {
  color: var(--cyan);
}

.page-about .headline {
  margin: 0 0 1.5rem;
}

.page-about .breadcrumb {
  margin-bottom: 2.75rem;
  font-size: .82rem;
  letter-spacing: .04em;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero__grid {
  display: grid;
  gap: 2.25rem;
}

.page-about .about-hero__owl {
  display: block;
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: clamp(4rem, 18vw, 8.5rem);
  line-height: .86;
  letter-spacing: -.03em;
  color: var(--ink);
}

.page-about .about-hero__cn {
  display: block;
  margin-top: .85rem;
  font-size: clamp(1.15rem, 4vw, 1.6rem);
  font-weight: 500;
  line-height: 1.35;
  letter-spacing: .01em;
  color: var(--moss);
  max-width: 22em;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 34em;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ab-ink-soft);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 2.5rem 0 0;
  padding: 1.75rem 0 0;
  border-top: 1px solid var(--ab-hair);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.1rem 1.5rem;
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: .55rem;
  font-size: .88rem;
  color: var(--ab-ink-soft);
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 1.05rem;
  letter-spacing: .04em;
  color: var(--ink);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: 4.5rem;
    align-items: start;
  }

  .page-about .about-hero__facts {
    gap: 1.35rem 2rem;
  }
}

/* ---------- 通用分栏 ---------- */

.page-about .about-split {
  display: grid;
  gap: 2.5rem;
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 3.5rem;
    align-items: start;
  }

  .page-about .about-split--flip {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }
}

.page-about .about-split__a .headline {
  margin-bottom: 1.5rem;
}

.page-about .about-split__a .prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 呼号铭牌 ---------- */

.page-about .owl-plate {
  position: relative;
  margin-top: 2.5rem;
  padding: 2.25rem 1.5rem 2rem;
  max-width: 440px;
  border: 2px solid var(--cyan);
  background: rgba(127, 227, 198, .07);
  color: var(--moon);
  display: grid;
  gap: .65rem;
  text-align: center;
  cursor: default;
  transition: box-shadow var(--ease), border-color var(--ease), transform var(--ease);
}

.page-about .owl-plate::before {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(127, 227, 198, .3);
  pointer-events: none;
}

.page-about .owl-plate:hover,
.page-about .owl-plate:focus-visible {
  box-shadow: var(--shadow-dark);
  border-color: var(--amber);
  transform: translateY(-2px);
  outline: none;
}

.page-about .owl-plate__mark {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(2.5rem, 12vw, 3.75rem);
  line-height: 1;
  letter-spacing: .22em;
  text-indent: .22em;
  color: var(--amber);
}

.page-about .owl-plate__rule {
  display: block;
  width: 48px;
  height: 1px;
  margin: 0 auto;
  background: rgba(127, 227, 198, .5);
}

.page-about .owl-plate__note {
  font-size: .82rem;
  letter-spacing: .08em;
  color: var(--moon);
}

.page-about .owl-plate__where {
  font-size: .72rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--cyan);
}

/* ---------- 业务线 ---------- */

.page-about .about-work__lede {
  max-width: 36em;
  margin: 0 0 3rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ab-ink-soft);
}

.page-about .work-lines {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .work-lines__item {
  position: relative;
  padding: 2.25rem 0;
  border-top: 2px solid var(--ab-hair);
}

.page-about .work-lines__item:last-child {
  border-bottom: 2px solid var(--ab-hair);
}

.page-about .work-lines__idx {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .18em;
  color: var(--moss);
  margin-bottom: .6rem;
}

.page-about .work-lines__name {
  margin: 0 0 .85rem;
  color: var(--ink);
}

.page-about .work-lines__desc {
  margin: 0 0 1rem;
  max-width: 40em;
  font-size: .96rem;
  line-height: 1.8;
  color: var(--ab-ink-soft);
}

.page-about .work-lines__for {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--stone);
}

@media (min-width: 900px) {
  .page-about .work-lines__item {
    display: grid;
    grid-template-columns: 4.5rem minmax(0, 1fr) minmax(0, 1.2fr);
    gap: 2rem;
    align-items: start;
    padding: 2.75rem 0;
  }

  .page-about .work-lines__idx {
    margin: 0;
    padding-top: .4rem;
  }

  .page-about .work-lines__name {
    margin: 0;
  }

  .page-about .work-lines__desc {
    grid-column: 3;
    margin: 0 0 .85rem;
  }

  .page-about .work-lines__for {
    grid-column: 3;
  }
}

.page-about .about-work .aside-note {
  margin-top: 3rem;
  max-width: 46em;
  padding-left: 1.25rem;
  border-left: 2px solid var(--clay);
}

.page-about .about-work .aside-note__title {
  margin: 0 0 .5rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .16em;
  color: var(--clay);
}

.page-about .about-work .aside-note p:last-child {
  margin: 0;
  font-size: .93rem;
  line-height: 1.8;
  color: var(--ab-ink-soft);
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: 2.5rem 0 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 2.75rem 1.75rem;
  border-left: 1px solid var(--ab-hair);
  outline: none;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: .3rem;
  width: 9px;
  height: 9px;
  background: var(--moss);
  transition: background var(--ease), transform var(--ease);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--amber);
  transform: scale(1.3);
}

.page-about .about-timeline__year {
  display: block;
  margin-bottom: .55rem;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 1.4rem;
  line-height: 1;
  letter-spacing: .04em;
  color: var(--moss);
  transition: color var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__year,
.page-about .about-timeline__item:focus-within .about-timeline__year {
  color: var(--clay);
}

.page-about .about-timeline__title {
  margin: 0 0 .7rem;
  color: var(--ink);
}

.page-about .about-timeline__body p {
  margin: 0 0 .5rem;
  max-width: 40em;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--ab-ink-soft);
}

.page-about .about-timeline__body p:last-child {
  margin-bottom: 0;
}

.page-about .about-timeline__peek {
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .04em;
  color: var(--moss);
  transition: color var(--ease), transform var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__peek,
.page-about .about-timeline__item:focus-within .about-timeline__peek {
  color: var(--clay);
  transform: translateX(4px);
}

@media (min-width: 860px) {
  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 6.5rem minmax(0, 1fr);
    gap: 2.5rem;
    align-items: start;
    padding: 0 0 3rem 2.25rem;
  }

  .page-about .about-timeline__year {
    margin-bottom: 0;
    font-size: 1.75rem;
  }

  .page-about .about-timeline__body p {
    max-width: 46em;
  }
}

/* ---------- 团队分工 ---------- */

.page-about .role-meter {
  list-style: none;
  margin: 2.25rem 0;
  padding: 1.75rem 0;
  border-top: 1px solid var(--ab-hair);
  border-bottom: 1px solid var(--ab-hair);
  display: grid;
  gap: 1.15rem;
}

.page-about .role-meter__row {
  display: grid;
  grid-template-columns: 5.5rem minmax(0, 1fr) 2.5rem;
  align-items: center;
  gap: 1rem;
}

.page-about .role-meter__name {
  font-size: .88rem;
  color: var(--ab-ink-soft);
  letter-spacing: .04em;
}

.page-about .role-meter__bar {
  position: relative;
  display: block;
  height: 6px;
  background: rgba(60, 71, 68, .14);
}

.page-about .role-meter__bar::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--fill, 0%);
  background: var(--moss);
}

.page-about .role-meter__num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 1rem;
  letter-spacing: .04em;
  text-align: right;
  color: var(--ink);
}

/* ---------- 合作生态 ---------- */

.page-about .partner-list {
  list-style: none;
  margin: 2.5rem 0 0;
  padding: 0;
}

.page-about .partner-list__item {
  position: relative;
  padding: 2rem 0 2rem 3.5rem;
  border-top: 2px solid var(--ab-hair);
}

.page-about .partner-list__item:last-child {
  border-bottom: 2px solid var(--ab-hair);
}

.page-about .partner-list__num {
  position: absolute;
  left: 0;
  top: 1.9rem;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 1.35rem;
  letter-spacing: .04em;
  color: var(--amber);
}

.page-about .partner-list__name {
  margin: 0 0 .75rem;
  color: var(--ink);
}

.page-about .partner-list__item p {
  margin: 0;
  max-width: 40em;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--ab-ink-soft);
}

/* ---------- 资质与服务 ---------- */

.page-about .credential-stack {
  margin: 2.5rem 0 0;
  display: grid;
  gap: 1rem;
  max-width: 56rem;
}

.page-about .credential {
  border: 2px solid var(--ab-hair-dark);
  background: rgba(30, 38, 36, .55);
  transition: border-color var(--ease), box-shadow var(--ease);
}

.page-about .credential[open] {
  border-color: var(--cyan);
  box-shadow: var(--shadow-dark);
}

.page-about .credential:hover {
  border-color: var(--amber);
}

.page-about .credential__summary {
  display: grid;
  grid-template-columns: 2.75rem minmax(0, 1fr) 1.25rem;
  align-items: center;
  gap: 1rem;
  padding: 1.35rem 1.25rem;
  cursor: pointer;
  list-style: none;
  color: var(--moon);
}

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

.page-about .credential__idx {
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .credential__title {
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.5;
}

.page-about .credential__sign {
  position: relative;
  width: 14px;
  height: 14px;
  justify-self: end;
}

.page-about .credential__sign::before,
.page-about .credential__sign::after {
  content: "";
  position: absolute;
  background: var(--amber);
  transition: transform var(--ease), opacity var(--ease);
}

.page-about .credential__sign::before {
  left: 0;
  right: 0;
  top: 6px;
  height: 2px;
}

.page-about .credential__sign::after {
  top: 0;
  bottom: 0;
  left: 6px;
  width: 2px;
}

.page-about .credential[open] .credential__sign::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .credential__body {
  padding: 0 1.25rem 1.5rem 5rem;
}

.page-about .credential__body p {
  margin: 0;
  max-width: 40em;
  font-size: .93rem;
  line-height: 1.85;
  color: rgba(243, 238, 228, .82);
}

.page-about .about-trust__cta {
  margin-top: 3rem;
  display: flex;
  flex-wrap: wrap;
  gap: .85rem;
}

@media (max-width: 560px) {
  .page-about .credential__summary {
    grid-template-columns: 2.25rem minmax(0, 1fr) 1rem;
    gap: .75rem;
    padding: 1.15rem 1rem;
  }

  .page-about .credential__body {
    padding: 0 1rem 1.25rem 3.75rem;
  }

  .page-about .about-trust__cta .btn {
    flex: 1 1 100%;
    text-align: center;
  }
}

/* ---------- 小屏兜底 ---------- */

@media (max-width: 420px) {
  .page-about .about-hero__facts {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .role-meter__row {
    grid-template-columns: 4.5rem minmax(0, 1fr) 2rem;
    gap: .75rem;
  }

  .page-about .partner-list__item {
    padding-left: 3rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    animation: none !important;
  }
}

.page-about {
  --fill: currentColor;
}