.page-about {
  --rail-w: 208px;
  --about-gap: clamp(24px, 4vw, 56px);
  --about-sec-gap: clamp(48px, 8vw, 104px);
}

/* 面包屑 */
.page-about .breadcrumb {
  padding-top: clamp(20px, 4vw, 36px);
  padding-bottom: 6px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t), border-color var(--t);
}

.page-about .breadcrumb a:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-about .breadcrumb__sep {
  margin: 0 8px;
  color: var(--ink-700);
}

/* 首屏 */
.page-about .about-hero {
  padding: clamp(32px, 6vw, 72px) 0 clamp(48px, 9vw, 110px);
  position: relative;
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 90px;
  background: radial-gradient(120% 100% at 78% 100%, rgba(52, 245, 208, 0.14), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(32px, 5vw, 60px);
  align-items: center;
  position: relative;
  z-index: 1;
}

.page-about .about-hero__copy .index-label {
  margin: 0 0 18px;
}

.page-about .about-hero__title {
  margin: 0 0 22px;
  color: var(--paper);
}

.page-about .about-hero__hang {
  display: block;
  color: var(--cyan);
}

.page-about .about-hero__copy .lede {
  max-width: 54ch;
  margin: 0 0 30px;
}

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

.page-about .about-hero__viz {
  position: relative;
  display: grid;
  gap: 18px;
  justify-items: center;
}

.page-about .about-hero__svg {
  width: min(100%, 340px);
  height: auto;
  display: block;
  filter: drop-shadow(0 0 26px rgba(52, 245, 208, 0.12));
}

.page-about .about-hero__ticks {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  justify-content: center;
  width: 100%;
}

.page-about .about-hero__tick {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .about-hero__tick b {
  display: block;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 0;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__tick--accent b {
  color: var(--yellow);
}

/* 画布与侧栏索引 */
.page-about .about-canvas {
  padding-bottom: clamp(56px, 9vw, 120px);
}

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

.page-about .about-rail__label {
  margin: 0 0 12px;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: block;
  white-space: nowrap;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-decoration: none;
  padding: 7px 13px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  transition: color var(--t), border-color var(--t), background-color var(--t);
}

.page-about .about-rail__link:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* 章节 */
.page-about .about-column {
  display: grid;
  gap: var(--about-sec-gap);
  min-width: 0;
}

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

.page-about .about-sec__head {
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-sec__head .index-label {
  margin: 0 0 14px;
}

.page-about .about-sec h2,
.page-about .about-sec h3 {
  color: var(--paper);
}

.page-about .about-sec__intro {
  max-width: 60ch;
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-sec--tint,
.page-about .about-sec--board {
  padding: clamp(28px, 5vw, 56px) clamp(20px, 4vw, 48px);
  border-radius: var(--r-lg);
}

.page-about .about-sec--tint {
  background: linear-gradient(160deg, var(--green), var(--ink-800) 62%);
}

.page-about .about-sec--board {
  background-color: var(--ink-800);
  background-image:
    linear-gradient(rgba(23, 63, 99, 0.5) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 63, 99, 0.5) 1px, transparent 1px);
  background-size: 48px 48px;
}

/* 01 业务 */
.page-about .about-what {
  align-items: start;
}

.page-about .about-what__text p {
  margin: 0 0 1.1em;
  color: var(--paper);
  font-size: 16px;
  line-height: 1.78;
}

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

.page-about .about-what__fig {
  margin: 0;
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-what__fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media__caption {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  padding: 10px 2px 0;
  line-height: 1.6;
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(28px, 5vw, 48px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-facts__row {
  display: grid;
  grid-template-columns: 96px 1fr;
  align-items: baseline;
  gap: 6px 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-facts__num {
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-facts__label {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--paper);
}

.page-about .about-facts__desc {
  grid-column: 1 / -1;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* 02 时间轴 */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  gap: 12px;
  padding: 26px 0 26px 24px;
  border-left: 2px solid var(--line);
  transition: border-color var(--t);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 34px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--ink-700);
  transition: border-color var(--t), box-shadow var(--t);
}

.page-about .about-timeline__item:hover {
  border-color: var(--cyan);
}

.page-about .about-timeline__item:hover::before {
  border-color: var(--cyan);
  box-shadow: 0 0 0 5px rgba(52, 245, 208, 0.14);
}

.page-about .about-timeline__item--now::before {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 5px rgba(52, 245, 208, 0.16);
}

.page-about .about-timeline__year {
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(24px, 4vw, 42px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.page-about .about-timeline__item--now .about-timeline__year {
  color: var(--cyan);
}

.page-about .about-timeline__body h3 {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 500;
  line-height: 1.4;
}

.page-about .about-timeline__body p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-timeline__more {
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  transition: border-color var(--t), color var(--t);
}

.page-about .about-timeline__item:hover .about-timeline__more,
.page-about .about-timeline__item:focus-within .about-timeline__more {
  border-color: var(--cyan);
  color: var(--paper);
}

/* 03 数据流程 */
.page-about .about-flow {
  margin-bottom: clamp(28px, 5vw, 44px);
}

.page-about .about-flow__svg {
  display: none;
  width: 100%;
  height: auto;
  margin-bottom: 24px;
  opacity: 0.85;
}

.page-about .about-flow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .about-flow__step {
  position: relative;
  padding: 20px 18px;
  border-radius: var(--r-md);
  background: linear-gradient(150deg, rgba(23, 63, 99, 0.55), rgba(13, 40, 67, 0.2));
  border: 1px solid var(--line-soft);
}

.page-about .about-flow__step .index-label {
  margin: 0 0 10px;
  color: var(--cyan-deep);
}

.page-about .about-flow__step h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 500;
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-pipeline__fig {
  margin: 0 0 clamp(28px, 5vw, 44px);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-pipeline__fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-note {
  padding: clamp(22px, 4vw, 34px);
  border-radius: var(--r-lg);
  background: linear-gradient(135deg, var(--ink-800), var(--green));
  border-left: 3px solid var(--coral);
}

.page-about .about-note h3 {
  margin: 0 0 12px;
  font-size: 19px;
  font-weight: 500;
}

.page-about .about-note p {
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* 04 团队 */
.page-about .about-team {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(32px, 6vw, 56px);
}

.page-about .about-team__cell {
  padding: 22px 20px 24px;
  border-radius: var(--r-md);
  background: rgba(6, 26, 46, 0.72);
  border: 1px solid var(--line-soft);
  transition: border-color var(--t), transform var(--t);
}

.page-about .about-team__cell:hover {
  border-color: var(--cyan);
  transform: translateY(-3px);
}

.page-about .about-team__cell--accent {
  background: linear-gradient(150deg, rgba(52, 245, 208, 0.14), rgba(6, 26, 46, 0.6));
  border-color: rgba(52, 245, 208, 0.42);
}

.page-about .about-team__num {
  display: block;
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(40px, 6vw, 62px);
  line-height: 0.95;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__label {
  display: block;
  margin: 10px 0 12px;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--paper);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-rhythm__title {
  margin: 0 0 20px;
  font-size: 19px;
  font-weight: 500;
}

.page-about .about-rhythm__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-rhythm__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 16px 16px 16px 20px;
  background: rgba(6, 26, 46, 0.55);
  border-left: 2px solid var(--line);
  transition: border-color var(--t), background-color var(--t);
}

.page-about .about-rhythm__item:hover {
  border-left-color: var(--yellow);
  background: rgba(6, 26, 46, 0.85);
}

.page-about .about-rhythm__time {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--yellow);
}

.page-about .about-rhythm__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* 05 生态 */
.page-about .about-partners {
  display: grid;
  gap: 20px;
  margin-bottom: clamp(28px, 5vw, 44px);
}

.page-about .about-partner {
  padding: 24px 0 24px 22px;
  border-left: 2px solid var(--ink-700);
  transition: border-color var(--t);
}

.page-about .about-partner:hover {
  border-left-color: var(--coral);
}

.page-about .about-partner h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 500;
}

.page-about .about-partner p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-partners__fig {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .about-partners__fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* 收尾 */
.page-about .about-cta {
  border-radius: var(--r-lg);
  padding: clamp(30px, 5vw, 56px) clamp(22px, 4vw, 48px);
}

.page-about .about-cta__inner {
  max-width: 62ch;
}

.page-about .about-cta h2 {
  margin: 0 0 16px;
  color: var(--paper);
}

.page-about .about-cta .lede {
  margin: 0 0 28px;
}

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

/* 响应式 */
@media (min-width: 680px) {
  .page-about .about-facts__row {
    grid-template-columns: 120px 1fr;
    align-items: center;
  }

  .page-about .about-facts__desc {
    grid-column: 2 / 3;
    margin-top: 2px;
  }

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

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

  .page-about .about-rhythm__item {
    grid-template-columns: 150px minmax(0, 1fr);
    align-items: baseline;
    gap: 18px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  }

  .page-about .about-timeline__item {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 28px;
    padding-left: 28px;
  }

  .page-about .about-timeline__year {
    padding-top: 4px;
  }

  .page-about .about-flow__svg {
    display: block;
  }

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

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

@media (min-width: 1040px) {
  .page-about .about-canvas__inner {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 118px;
  }

  .page-about .about-rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    border: 0;
    border-left: 2px solid var(--line-soft);
    border-radius: 0;
    padding: 9px 0 9px 14px;
    white-space: normal;
    line-height: 1.5;
  }

  .page-about .about-rail__link:hover {
    border-left-color: var(--cyan);
  }

  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__cell,
  .page-about .about-team__cell:hover {
    transform: none;
  }
}