.page-about {
  --ab-pad-y: clamp(44px, 7.5vw, 92px);
  --ab-gap: clamp(22px, 3vw, 42px);
}

.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  background: var(--c-deep);
  color: var(--c-mist);
  border-bottom: 4px solid var(--c-orange);
  padding: clamp(24px, 5vw, 44px) 0 clamp(34px, 7vw, 66px);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(244, 247, 249, .055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(244, 247, 249, .055) 1px, transparent 1px);
  background-size: 72px 72px;
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  right: -130px;
  top: -140px;
  width: 340px;
  height: 340px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 107, 53, .32), transparent 68%);
  pointer-events: none;
}

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

.page-about .ab-breadcrumb {
  margin-bottom: clamp(20px, 4vw, 34px);
}

.page-about .ab-breadcrumb .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-breadcrumb .breadcrumb__item {
  display: inline-flex;
  align-items: center;
  font-size: 13px;
  min-width: 0;
}

.page-about .ab-breadcrumb .breadcrumb__link,
.page-about .ab-breadcrumb .breadcrumb__sep {
  color: rgba(244, 247, 249, .62);
  text-decoration: none;
}

.page-about .ab-breadcrumb .breadcrumb__link:hover {
  color: var(--c-gold);
}

.page-about .ab-breadcrumb .breadcrumb__current {
  color: var(--c-white);
  font-weight: 600;
}

.page-about .ab-hero__kicker {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--c-gold);
}

.page-about .ab-hero__title {
  margin: 0 0 18px;
  max-width: 18ch;
  font-size: clamp(30px, 7vw, 62px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -.015em;
  color: var(--c-white);
}

.page-about .ab-hero__lede {
  margin: 0;
  max-width: 66ch;
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.75;
  color: rgba(244, 247, 249, .8);
}

.page-about .ab-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
  margin: clamp(28px, 5vw, 44px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-facts__item {
  min-width: 0;
  border-top: 2px solid rgba(244, 247, 249, .24);
  padding-top: 10px;
}

.page-about .ab-facts__value {
  display: block;
  font-size: clamp(20px, 3.4vw, 28px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-gold);
}

.page-about .ab-facts__label {
  display: block;
  margin-top: 5px;
  font-size: 13px;
  line-height: 1.55;
  color: rgba(244, 247, 249, .7);
}

/* ---------- 堆叠面板章节 ---------- */

.page-about .ab-section {
  padding: var(--ab-pad-y) 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-section--mist {
  background: var(--c-mist);
}

.page-about .ab-section--white {
  background: var(--c-white);
}

.page-about .ab-section--teal {
  background: var(--c-teal);
  border-top-color: var(--line-inv);
  color: var(--c-mist);
}

.page-about .ab-section--deep {
  background: var(--c-deep);
  border-top-color: var(--line-inv);
  color: var(--c-mist);
}

.page-about .chapter {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: clamp(14px, 2.6vw, 28px);
  align-items: start;
  margin: 0 0 clamp(26px, 4vw, 48px);
}

.page-about .chapter__num {
  font-size: clamp(26px, 5.4vw, 46px);
  font-weight: 700;
  line-height: .95;
  letter-spacing: -.02em;
  color: var(--c-wine);
}

.page-about .ab-section--teal .chapter__num,
.page-about .ab-section--deep .chapter__num {
  color: var(--c-gold);
}

.page-about .chapter__kicker {
  margin: 0 0 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--c-gray);
}

.page-about .ab-section--teal .chapter__kicker,
.page-about .ab-section--deep .chapter__kicker {
  color: rgba(244, 247, 249, .6);
}

.page-about .chapter__title {
  margin: 0 0 12px;
  font-size: clamp(23px, 4.2vw, 40px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -.012em;
  color: var(--c-deep);
}

.page-about .ab-section--teal .chapter__title,
.page-about .ab-section--deep .chapter__title {
  color: var(--c-white);
}

.page-about .chapter__lede {
  margin: 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.75;
  color: var(--c-gray);
}

.page-about .ab-section--teal .chapter__lede,
.page-about .ab-section--deep .chapter__lede {
  color: rgba(244, 247, 249, .78);
}

/* ---------- 01 起源 ---------- */

.page-about .ab-origin {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-origin__text :first-child {
  margin-top: 0;
}

.page-about .ab-mission {
  background: var(--c-deep);
  border-top: 4px solid var(--c-orange);
  padding: clamp(22px, 3vw, 34px);
  align-self: start;
}

.page-about .ab-mission__quote {
  margin: 0;
  font-size: clamp(18px, 2.4vw, 24px);
  font-weight: 700;
  line-height: 1.5;
  color: var(--c-white);
}

.page-about .ab-mission__note {
  margin: 16px 0 0;
  font-size: 13px;
  letter-spacing: .04em;
  color: rgba(244, 247, 249, .62);
}

/* ---------- 02 时间线 ---------- */

.page-about .ab-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 28px;
  list-style: none;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(to bottom, var(--c-orange), var(--c-gold) 52%, rgba(16, 24, 32, .14));
}

.page-about .ab-timeline__item {
  position: relative;
  padding-bottom: 28px;
  transition: opacity .5s ease, transform .5s ease;
}

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

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 6px;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  background: var(--c-orange);
  border: 2px solid var(--c-white);
}

.page-about .ab-timeline__item:nth-child(2) { transition-delay: .05s; }
.page-about .ab-timeline__item:nth-child(3) { transition-delay: .1s; }
.page-about .ab-timeline__item:nth-child(4) { transition-delay: .15s; }
.page-about .ab-timeline__item:nth-child(5) { transition-delay: .2s; }
.page-about .ab-timeline__item:nth-child(6) { transition-delay: .25s; }

.page-about .ab-timeline__year {
  display: block;
  font-size: clamp(18px, 2.6vw, 22px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--c-wine);
}

.page-about .ab-timeline__title {
  margin: 6px 0 8px;
  font-size: clamp(17px, 2.1vw, 21px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--c-deep);
}

.page-about .ab-timeline__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-gray);
}

/* ---------- 图片 ---------- */

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .media__img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .media__frame {
  overflow: hidden;
  background: rgba(10, 37, 64, .06);
}

.page-about .media__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--c-gray);
}

.page-about .ab-figure {
  margin: clamp(28px, 4.5vw, 48px) 0 0;
}

/* ---------- 03 服务网络 ---------- */

.page-about .ab-network {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-network__text :first-child {
  margin-top: 0;
}

.page-about .ab-network__text p {
  color: rgba(244, 247, 249, .82);
}

.page-about .ab-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line-inv);
  border: 1px solid var(--line-inv);
}

.page-about .ab-metrics > li {
  min-width: 0;
  padding: clamp(16px, 2.4vw, 22px) clamp(14px, 2vw, 20px);
  background: rgba(10, 37, 64, .5);
}

.page-about .ab-metrics__value {
  display: block;
  font-size: clamp(24px, 4vw, 34px);
  font-weight: 700;
  line-height: 1.05;
  color: var(--c-gold);
}

.page-about .ab-metrics__label {
  display: block;
  margin-top: 7px;
  font-size: 13px;
  line-height: 1.55;
  color: rgba(244, 247, 249, .74);
}

/* ---------- 04 团队 ---------- */

.page-about .ab-team {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-figure--team {
  margin: 0;
}

.page-about .ab-roles {
  margin: 0 0 clamp(22px, 3vw, 32px);
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-roles__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 14px;
  padding: 14px 16px;
  background: var(--c-white);
}

.page-about .ab-roles__num {
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--c-green);
}

.page-about .ab-roles__desc {
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--c-ink);
}

.page-about .ab-flow {
  counter-reset: ab-flow;
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .ab-flow > li {
  position: relative;
  counter-increment: ab-flow;
  padding: 16px 18px 16px 58px;
  background: var(--c-white);
  border: 1px solid var(--line);
  border-left: 3px solid var(--c-green);
}

.page-about .ab-flow > li::before {
  content: counter(ab-flow, decimal-leading-zero);
  position: absolute;
  left: 16px;
  top: 16px;
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  color: var(--c-green);
}

.page-about .ab-flow__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--c-deep);
}

.page-about .ab-flow__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--c-gray);
}

/* ---------- 05 荣誉 ---------- */

.page-about .ab-honors {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-badges {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-badge {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding: 15px 18px;
  background: var(--c-white);
  border: 1px solid var(--line);
  border-top: 3px solid var(--c-gold);
  transition: transform var(--t-mid), box-shadow var(--t-mid);
}

.page-about .ab-badge:hover,
.page-about .ab-badge:focus-within {
  transform: translateY(-3px);
  box-shadow: var(--shadow-1);
}

.page-about .ab-badge__year {
  font-size: 18px;
  font-weight: 700;
  color: var(--c-orange);
}

.page-about .ab-badge__text {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--c-ink);
}

.page-about .ab-honors__text p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-gray);
}

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

.page-about .ab-figure--network {
  margin: 0;
}

/* ---------- 06 本地化 ---------- */

.page-about .ab-local {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-local__text :first-child {
  margin-top: 0;
}

.page-about .ab-local__text p {
  color: rgba(244, 247, 249, .82);
}

.page-about .ab-contact-card {
  align-self: start;
  border: 1px solid var(--line-inv-2);
  background: rgba(244, 247, 249, .045);
  padding: clamp(20px, 3vw, 30px);
}

.page-about .ab-contact-card__row {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 13px 0;
  border-bottom: 1px dashed var(--line-inv);
}

.page-about .ab-contact-card__row:last-of-type {
  border-bottom: 0;
}

.page-about .ab-contact-card__label {
  font-size: 12px;
  letter-spacing: .12em;
  color: rgba(244, 247, 249, .58);
}

.page-about .ab-contact-card__value {
  font-family: var(--font-mono);
  font-size: clamp(15px, 1.9vw, 18px);
  font-weight: 500;
  line-height: 1.5;
  color: var(--c-white);
  overflow-wrap: anywhere;
}

.page-about .ab-contact-card__btn {
  margin-top: 20px;
}

/* ---------- 结尾 ---------- */

.page-about .ab-next {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  padding: clamp(24px, 4vw, 42px);
  background: var(--c-mist);
  border: 1px solid var(--line);
  border-top: 4px solid var(--c-orange);
}

.page-about .ab-next__title {
  margin: 0 0 12px;
  font-size: clamp(22px, 3.6vw, 34px);
  font-weight: 800;
  line-height: 1.25;
  color: var(--c-deep);
}

.page-about .ab-next__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-gray);
}

.page-about .ab-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-next__actions .btn {
  flex: 1 1 140px;
  text-align: center;
}

/* ---------- 响应式 ---------- */

@media (min-width: 560px) {
  .page-about .ab-next__actions .btn {
    flex: 0 0 auto;
  }
}

@media (min-width: 720px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
  }

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

@media (min-width: 860px) {
  .page-about .ab-timeline__item {
    display: grid;
    grid-template-columns: 110px minmax(0, 1fr);
    column-gap: 26px;
    padding-bottom: 32px;
  }

  .page-about .ab-timeline__year {
    font-size: 21px;
    padding-top: 1px;
  }

  .page-about .ab-timeline__title {
    margin-top: 0;
  }
}

@media (min-width: 900px) {
  .page-about .ab-origin {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, .95fr);
    align-items: start;
  }

  .page-about .ab-network {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-about .ab-honors {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

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

  .page-about .ab-figure--network {
    grid-column: 1 / -1;
  }

  .page-about .ab-local {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: start;
  }

  .page-about .ab-next {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    align-items: center;
  }

  .page-about .ab-next__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1080px) {
  .page-about .ab-metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-flow {
    gap: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-timeline__item,
  .page-about .ab-badge {
    transition: none;
  }

  .page-about .ab-badge:hover,
  .page-about .ab-badge:focus-within {
    transform: none;
  }
}