.page-about {
  display: block;
  background: var(--ink-900);
  color: var(--text);
  padding-bottom: clamp(52px, 9vw, 104px);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .ab-crumb {
  padding-top: clamp(20px, 5vw, 42px);
}

.page-about .ab-crumb__here {
  color: var(--muted);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding: clamp(26px, 5vw, 56px) 0 clamp(40px, 7vw, 82px);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
  align-items: start;
}

.page-about .ab-hero__lead {
  min-width: 0;
}

.page-about .ab-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(29px, 6.2vw, 56px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 14px 0 0;
  max-width: 15em;
}

.page-about .ab-hero__text {
  margin: clamp(16px, 3vw, 24px) 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--text-soft);
  max-width: 40ch;
}

.page-about .ab-hero__stats {
  list-style: none;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 18px;
}

.page-about .ab-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.page-about .ab-stat__num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(23px, 3.6vw, 33px);
  line-height: 1;
  color: var(--clay);
}

.page-about .ab-stat__cap {
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(26px, 4vw, 36px);
}

.page-about .ab-hero__figure {
  margin: 0;
  min-width: 0;
}

.page-about .ab-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: 18px 6px 18px 6px;
  border: 1px solid var(--line);
  background: var(--ink-700);
}

.page-about .ab-hero__cap {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 章节导航 ---------- */
.page-about .ab-nav {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--ink-800);
}

.page-about .ab-nav__row {
  display: flex;
  gap: clamp(16px, 3vw, 34px);
  overflow-x: auto;
  padding-top: 13px;
  padding-bottom: 13px;
  scrollbar-width: none;
}

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

.page-about .ab-nav__link {
  flex: 0 0 auto;
  font-family: var(--font-ui);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--muted);
  text-decoration: none;
  padding-bottom: 5px;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color var(--t-fast) var(--ease-out), border-color var(--t-fast) var(--ease-out);
}

.page-about .ab-nav__link:hover,
.page-about .ab-nav__link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .ab-nav__link[aria-current="true"] {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 通用区块标题 ---------- */
.page-about .ab-sec-head {
  max-width: 60ch;
  margin-bottom: clamp(28px, 5vw, 50px);
}

.page-about .ab-h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(25px, 4.3vw, 42px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  margin: 12px 0 0;
}

.page-about .ab-lead {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--text-soft);
  max-width: 42ch;
}

/* ---------- 时间线 ---------- */
.page-about .ab-tl {
  padding: clamp(44px, 8vw, 92px) 0;
  background: var(--ink-800);
}

.page-about .ab-tl__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(22px, 4vw, 34px);
}

.page-about .ab-tl__list::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--line) 26%, var(--line) 74%, rgba(42, 59, 87, 0) 100%);
}

.page-about .ab-tl__item {
  position: relative;
  padding-left: 46px;
  min-width: 0;
}

.page-about .ab-tl__dot {
  position: absolute;
  left: 0;
  top: 16px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 5px rgba(0, 230, 195, 0.08);
}

.page-about .ab-tl__card {
  background: var(--ink-700);
  border: 1px solid var(--line);
  border-radius: 18px 6px 18px 6px;
  padding: clamp(18px, 2.6vw, 26px);
  transition: transform var(--t-base) var(--ease-out), border-color var(--t-base) var(--ease-out), background var(--t-base) var(--ease-out);
}

.page-about .ab-tl__item:hover .ab-tl__card {
  transform: translateY(-3px);
  border-color: var(--cyan);
  background: var(--ink-650);
}

.page-about .ab-tl__season {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.07em;
  color: var(--cyan);
  margin: 0;
}

.page-about .ab-tl__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(18px, 2.3vw, 22px);
  line-height: 1.36;
  margin: 9px 0 0;
}

.page-about .ab-tl__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--text-soft);
}

.page-about .ab-shot {
  margin: clamp(34px, 5vw, 58px) 0 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-shot img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: 6px 16px 6px 16px;
  border: 1px solid var(--line);
  background: var(--ink-700);
}

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

/* ---------- 留白段 ---------- */
.page-about .ab-breath {
  padding: clamp(58px, 11vw, 130px) 0;
}

.page-about .ab-breath__inner {
  position: relative;
  min-height: 140px;
  display: flex;
  align-items: center;
}

.page-about .ab-breath__rule {
  position: absolute;
  left: 0;
  top: 6px;
  width: min(300px, 52%);
  height: 2px;
  background: linear-gradient(90deg, var(--cyan) 0%, rgba(0, 230, 195, 0) 100%);
  transform: rotate(-12deg);
  transform-origin: left center;
  pointer-events: none;
}

.page-about .ab-breath__quote {
  margin: 0;
  padding-left: clamp(0px, 6vw, 84px);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(20px, 3.4vw, 32px);
  line-height: 1.5;
  letter-spacing: -0.005em;
  color: var(--text);
  max-width: 24em;
}

/* ---------- 数据能力 ---------- */
.page-about .ab-data {
  padding: clamp(44px, 8vw, 92px) 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-data__grid {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
  align-items: start;
}

.page-about .ab-modules {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-modules__row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 18px 6px;
  border-bottom: 1px solid var(--line);
  border-radius: 4px;
  transition: background var(--t-fast) var(--ease-out);
}

.page-about .ab-modules__row:hover {
  background: rgba(0, 230, 195, 0.05);
}

.page-about .ab-modules__idx {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  padding-top: 4px;
}

.page-about .ab-modules__name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 17px;
  line-height: 1.4;
  margin: 0;
}

.page-about .ab-modules__note {
  margin: 7px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--text-soft);
  max-width: 40ch;
}

.page-about .ab-panel {
  background: var(--ink-700);
  border: 1px solid var(--line);
  border-radius: 14px 14px 4px 14px;
  padding: clamp(20px, 3.2vw, 30px);
  min-width: 0;
}

.page-about .ab-panel__kicker {
  margin: 0;
  font-family: var(--font-ui);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .ab-panel__num {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(38px, 6vw, 54px);
  line-height: 1;
  color: var(--clay);
}

.page-about .ab-panel__plus {
  font-size: 0.55em;
  vertical-align: 0.28em;
  margin-left: 2px;
}

.page-about .ab-panel__cap {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-soft);
}

.page-about .ab-panel__spark {
  display: block;
  width: 100%;
  height: auto;
  margin: clamp(18px, 3vw, 26px) 0 0;
}

.page-about .ab-panel__area {
  fill: rgba(0, 230, 195, 0.16);
}

.page-about .ab-panel__line {
  stroke: var(--cyan);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.page-about .ab-panel__list {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .ab-panel__list li {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  align-items: baseline;
  justify-content: space-between;
  padding: 11px 0;
  border-bottom: 1px dashed var(--line);
}

.page-about .ab-panel__label {
  font-size: 13.5px;
  color: var(--muted);
}

.page-about .ab-panel__value {
  font-size: 14px;
  color: var(--text);
}

.page-about .ab-panel__link {
  margin-top: clamp(18px, 3vw, 24px);
}

/* ---------- 团队与伙伴 ---------- */
.page-about .ab-team {
  padding: clamp(44px, 8vw, 92px) 0;
  background: var(--ink-800);
}

.page-about .ab-team__grid {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
  align-items: start;
}

.page-about .ab-team__figure {
  margin: 0;
  min-width: 0;
}

.page-about .ab-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: 18px 6px 18px 6px;
  border: 1px solid var(--line);
  background: var(--ink-700);
}

.page-about .ab-team__cap {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .ab-team__body {
  min-width: 0;
}

.page-about .ab-facts {
  list-style: none;
  margin: clamp(22px, 3.6vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-facts li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--line);
}

.page-about .ab-facts__num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 20px;
  line-height: 1.2;
  color: var(--cyan-soft);
  min-width: 3.4em;
}

.page-about .ab-facts__text {
  font-size: 15px;
  line-height: 1.72;
  color: var(--text-soft);
}

.page-about .ab-team__honor {
  margin: clamp(22px, 3.6vw, 32px) 0 0;
  padding: 14px 18px;
  border-left: 3px solid var(--clay);
  background: var(--clay-deep);
  border-radius: 4px 14px 4px 14px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--clay-soft);
}

/* ---------- 服务主张 ---------- */
.page-about .ab-stand {
  padding: clamp(52px, 9vw, 108px) 0 clamp(20px, 4vw, 40px);
}

.page-about .ab-stand__inner {
  position: relative;
  overflow: hidden;
  border-radius: 18px 6px 18px 6px;
  border: 1px solid var(--line);
  background: var(--ink-800);
  padding: clamp(30px, 6vw, 72px) clamp(22px, 5vw, 64px);
}

.page-about .ab-stand__wash {
  position: absolute;
  right: -10%;
  bottom: -34%;
  width: min(460px, 62%);
  height: 280px;
  transform: rotate(-12deg);
  border-radius: 18px 6px 18px 6px;
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.22) 0%, rgba(0, 230, 195, 0.1) 100%);
  pointer-events: none;
}

.page-about .ab-stand__body {
  position: relative;
  z-index: 1;
  max-width: 58ch;
}

.page-about .ab-stand__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(24px, 4.2vw, 40px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  margin: 12px 0 0;
}

.page-about .ab-stand__text {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-soft);
  max-width: 40ch;
}

.page-about .ab-stand__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(26px, 4vw, 38px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .ab-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(34px, 4vw, 64px);
  }

  .page-about .ab-hero__figure img {
    aspect-ratio: 5 / 6;
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(34px, 4vw, 60px);
  }
}

@media (min-width: 960px) {
  .page-about .ab-tl__list {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    column-gap: 80px;
    row-gap: clamp(28px, 4vw, 44px);
  }

  .page-about .ab-tl__list::before {
    left: 50%;
    transform: translateX(-1px);
  }

  .page-about .ab-tl__item {
    padding-left: 0;
  }

  .page-about .ab-tl__item--l {
    grid-column: 1;
  }

  .page-about .ab-tl__item--r {
    grid-column: 2;
  }

  .page-about .ab-tl__item--l .ab-tl__card {
    text-align: right;
  }

  .page-about .ab-tl__item--l .ab-tl__dot {
    left: auto;
    right: -50px;
  }

  .page-about .ab-tl__item--r .ab-tl__dot {
    left: -50px;
    right: auto;
  }

  .page-about .ab-data__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(34px, 4vw, 60px);
  }

  .page-about .ab-breath__quote {
    padding-left: clamp(40px, 7vw, 96px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tl__item:hover .ab-tl__card {
    transform: none;
  }
}