.page-about {
  --about-gap: clamp(28px, 5vw, 72px);
  --about-measure: 34em;
}

/* 面包屑 */
.page-about .about-crumb {
  padding-top: clamp(18px, 3vw, 32px);
}

/* ============ 首屏：超大标题 + 窄栏正文 ============ */
.page-about .about-hero {
  padding-block: clamp(24px, 4vw, 52px) clamp(36px, 6vw, 80px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 44px);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    align-items: start;
    column-gap: clamp(32px, 5vw, 76px);
  }
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: var(--fs-h1);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--warm);
  max-width: 14em;
}

.page-about .about-hero__lead {
  margin: 0;
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.6;
  color: var(--warm);
  max-width: var(--about-measure);
}

.page-about .about-hero__text {
  margin: 18px 0 0;
  color: var(--celadon);
  line-height: 1.8;
  max-width: var(--about-measure);
}

.page-about .about-hero__actions {
  margin: 26px 0 0;
}

/* 首屏数据条 */
.page-about .about-facts {
  margin-top: clamp(34px, 5vw, 64px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border-block: 1px solid var(--line);
}

@media (min-width: 760px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-facts .data-strip__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px;
  background: var(--ink);
}

.page-about .about-facts .data-strip__num {
  font-size: clamp(30px, 4.6vw, 46px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .about-facts .data-strip__label {
  font-size: var(--fs-label);
  letter-spacing: 0.06em;
  color: var(--celadon);
}

/* ============ A01 我们做的事 ============ */
.page-about .about-scope__grid {
  row-gap: clamp(24px, 3vw, 36px);
}

.page-about .about-scope__prose {
  max-width: var(--about-measure);
}

.page-about .about-scope__panel {
  padding: clamp(20px, 2.6vw, 30px);
}

.page-about .about-cats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 18px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cats .legend__item {
  font-size: var(--fs-body);
  color: var(--warm);
}

.page-about .about-scope__panel-note {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--celadon);
  font-size: var(--fs-small);
  line-height: 1.75;
}

/* ============ A02 团队 ============ */
.page-about .about-team__figure {
  margin: 0 0 clamp(26px, 4vw, 44px);
}

.page-about .about-team__grid {
  row-gap: clamp(16px, 2.4vw, 26px);
}

.page-about .about-crew {
  height: 100%;
  padding: clamp(18px, 2.2vw, 26px);
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-top: 2px solid var(--cyan);
}

.page-about .about-crew .panel__title {
  font-size: var(--fs-h4);
  font-weight: 800;
  color: var(--warm);
}

.page-about .about-crew .panel__text {
  color: var(--celadon);
  font-size: var(--fs-small);
  line-height: 1.8;
}

/* ============ A03 流程 ============ */
.page-about .about-flow__grid {
  row-gap: clamp(24px, 3vw, 40px);
}

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

.page-about .flow-step {
  position: relative;
  padding: 22px 20px 22px clamp(58px, 8vw, 74px);
  background: rgba(18, 59, 51, 0.42);
  border: 1px solid var(--line);
  border-bottom: 0;
  transition: background var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}

.page-about .flow-step:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .flow-step__num {
  position: absolute;
  top: 24px;
  left: clamp(16px, 2.4vw, 22px);
  font-size: var(--fs-data);
  color: var(--cyan);
  letter-spacing: 0.04em;
}

.page-about .flow-step__title {
  margin: 0 0 8px;
  font-size: var(--fs-h4);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--warm);
}

.page-about .flow-step__text {
  margin: 0;
  color: var(--warm);
  font-size: var(--fs-small);
  line-height: 1.8;
  max-width: 40em;
}

.page-about .flow-step__more {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  color: var(--celadon);
  font-size: var(--fs-label);
  line-height: 1.7;
  letter-spacing: 0.02em;
  transition: max-height var(--dur) var(--ease),
              opacity var(--dur) var(--ease),
              margin-top var(--dur) var(--ease);
}

.page-about .flow-step:hover,
.page-about .flow-step:focus-within {
  background: var(--teal-deep);
  border-color: var(--cyan);
  transform: translateX(4px);
}

.page-about .flow-step:hover .flow-step__more,
.page-about .flow-step:focus-within .flow-step__more {
  max-height: 8em;
  opacity: 1;
  margin-top: 10px;
}

.page-about .about-flow__figure {
  margin: 0;
  align-self: start;
}

@media (min-width: 1024px) {
  .page-about .about-flow__figure {
    position: sticky;
    top: calc(var(--ticker-h) + var(--utilbar-h) + 28px);
  }
}

/* ============ A04 节奏 ============ */
.page-about .about-cadence__grid {
  row-gap: clamp(16px, 2.4vw, 26px);
}

.page-about .about-cadence__card {
  height: 100%;
  padding: clamp(20px, 2.6vw, 28px);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-cadence__figure {
  font-size: clamp(24px, 3.2vw, 34px);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--orange);
  margin: 4px 0 6px;
}

.page-about .about-cadence__card .panel__title {
  font-size: var(--fs-h4);
  font-weight: 800;
  color: var(--warm);
}

.page-about .about-cadence__card .panel__text {
  color: var(--celadon);
  font-size: var(--fs-small);
  line-height: 1.8;
}

.page-about .about-matrix {
  margin-top: clamp(30px, 4vw, 52px);
  padding: clamp(22px, 3vw, 34px);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  background: var(--carbon);
}

.page-about .about-matrix__head {
  margin: 0 0 18px;
  font-size: var(--fs-label);
  letter-spacing: 0.14em;
  color: var(--celadon);
}

.page-about .about-matrix__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

@media (min-width: 720px) {
  .page-about .about-matrix__grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

.page-about .about-matrix__grid .matrix__cell {
  padding: 14px 8px;
  text-align: center;
  font-size: var(--fs-label);
  letter-spacing: 0.04em;
}

.page-about .about-matrix__note {
  margin: 20px 0 0;
  color: var(--celadon);
  font-size: var(--fs-small);
  line-height: 1.75;
  max-width: var(--about-measure);
}

/* ============ A05 历程 ============ */
.page-about .about-history__figure {
  margin: 0 0 clamp(28px, 4vw, 48px);
}

.page-about .about-history__scale {
  margin-bottom: clamp(28px, 4vw, 48px);
  padding-top: 6px;
  border-top: 1px solid var(--line);
}

.page-about .season-scale {
  display: block;
  width: 100%;
  height: auto;
  margin-top: 8px;
}

.page-about .season-scale__line {
  stroke: var(--line);
  stroke-width: 1;
}

.page-about .season-scale__fill {
  stroke: var(--cyan);
  stroke-width: 2;
  opacity: 0.7;
}

.page-about .season-scale__dot {
  fill: var(--cyan);
}

.page-about .season-scale__dot--start {
  fill: var(--orange);
}

.page-about .season-scale__label {
  fill: var(--celadon);
  font-family: var(--font-mono);
  font-size: 24px;
  letter-spacing: 0.04em;
}

@media (max-width: 640px) {
  .page-about .season-scale__label {
    display: none;
  }

  .page-about .season-scale {
    margin-bottom: 4px;
  }
}

.page-about .about-history__jump {
  margin-top: 14px;
  row-gap: 8px;
  column-gap: 12px;
}

.page-about .about-history__jump a {
  font-size: var(--fs-label);
  letter-spacing: 0.04em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-block: 4px;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-history__jump a:hover,
.page-about .about-history__jump a:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

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

.page-about .stage-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: clamp(22px, 3vw, 34px) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--ticker-h) + var(--utilbar-h) + 24px);
}

.page-about .stage-item:last-child {
  border-bottom: 1px solid var(--line);
}

@media (min-width: 760px) {
  .page-about .stage-item {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(20px, 3vw, 48px);
    align-items: start;
  }
}

.page-about .stage-item__era {
  color: var(--orange);
  font-size: var(--fs-data);
  letter-spacing: 0.04em;
  margin: 0;
  padding-top: 4px;
}

.page-about .stage-item__body {
  max-width: 44em;
}

.page-about .stage-item__title {
  margin: 0 0 10px;
  font-size: var(--fs-h4);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--warm);
}

.page-about .stage-item__body p {
  margin: 0;
  color: var(--celadon);
  line-height: 1.8;
  font-size: var(--fs-body);
}

/* ============ A06 长期使用 ============ */
.page-about .about-value__grid {
  row-gap: clamp(22px, 3vw, 36px);
}

.page-about .about-value__item {
  padding-top: 22px;
  border-top: 2px solid var(--teal-deep);
}

.page-about .about-value__idx {
  margin: 0 0 14px;
  font-size: var(--fs-data);
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-value__title {
  margin: 0 0 12px;
  font-size: var(--fs-h4);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--warm);
}

.page-about .about-value__text {
  margin: 0;
  color: var(--celadon);
  font-size: var(--fs-small);
  line-height: 1.85;
  max-width: 30em;
}

/* 收束区块 */
.page-about .about-cta {
  position: relative;
  margin-top: clamp(40px, 6vw, 84px);
  padding: clamp(28px, 4vw, 56px) clamp(20px, 4vw, 56px);
  background: linear-gradient(135deg, var(--teal-deep) 0%, var(--carbon) 68%);
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
}

.page-about .about-cta__eyebrow {
  margin: 0 0 16px;
  font-size: var(--fs-label);
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-cta__title {
  margin: 0 0 16px;
  font-size: var(--fs-h3);
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.15;
  color: var(--warm);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 46em;
  color: var(--celadon);
  font-size: var(--fs-small);
  line-height: 1.85;
}

.page-about .about-cta__actions {
  margin: 26px 0 0;
  row-gap: 12px;
}

.page-about .about-cta__foot {
  margin: 22px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

/* 图片容器比例覆盖 */
.page-about .media-frame.about-figure--3x2 {
  aspect-ratio: 3 / 2;
}

.page-about .media-frame.about-figure--wide {
  aspect-ratio: 12 / 5;
}

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

@media (max-width: 640px) {
  .page-about .flow-step {
    padding-left: 54px;
  }

  .page-about .flow-step__num {
    top: 20px;
    left: 16px;
  }

  .page-about .about-cta {
    border-left-width: 2px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .flow-step,
  .page-about .flow-step__more,
  .page-about .about-history__jump a {
    transition: none;
  }
}