.page-about {
  --ab-sheet-pad: clamp(20px, 4vw, 48px);
  --ab-body-text: #C3CCDA;
  --ab-paper-line: rgba(20, 24, 31, 0.16);
  background: var(--ink-900);
  color: var(--white);
}

.page-about .about-hero {
  padding-top: calc(var(--header-h) + clamp(36px, 7vw, 96px));
  padding-bottom: clamp(36px, 6vw, 72px);
  position: relative;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 0;
  top: 18%;
  width: min(38vw, 320px);
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--volt-green));
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-hero .eyebrow {
  margin-top: clamp(28px, 5vw, 52px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 7.2vw, 82px);
  line-height: 0.96;
  letter-spacing: -0.01em;
  margin: 16px 0 0;
  max-width: 14ch;
}

.page-about .about-hero__lede {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 52ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--ab-body-text);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--ink-700);
  border: 1px solid var(--ink-700);
  margin-top: clamp(30px, 5vw, 56px);
}

.page-about .about-hero__stat {
  background: var(--ink-900);
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 3.6vw, 34px);
  font-weight: 700;
  color: var(--volt-green);
  line-height: 1;
}

.page-about .about-hero__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--gray-400);
}

/* 主体：左侧索引 + 右侧内容流 */
.page-about .about-body {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding-bottom: clamp(56px, 8vw, 112px);
}

.page-about .about-index__title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gray-400);
  font-family: var(--font-mono);
}

.page-about .about-index__list {
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-index__link {
  display: block;
  white-space: nowrap;
  padding: 7px 12px;
  border: 1px solid var(--ink-700);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gray-400);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-index__link:hover {
  color: var(--white);
  border-color: var(--gray-400);
}

.page-about .about-index__link[data-active] {
  color: var(--ink-900);
  background: var(--volt-green);
  border-color: var(--volt-green);
  font-weight: 700;
}

.page-about .about-flow {
  min-width: 0;
}

.page-about .about-chapter {
  padding-block: clamp(28px, 4.5vw, 56px);
  border-top: 1px solid var(--ink-700);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-chapter__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 4.2vw, 42px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 10px 0 0;
  max-width: 20ch;
}

.page-about .about-text {
  margin-top: clamp(16px, 2.5vw, 24px);
  max-width: 62ch;
}

.page-about .about-text p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ab-body-text);
}

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

/* 暖纸插页：时间线 */
.page-about .about-sheet {
  background: var(--paper-100);
  color: var(--on-paper);
  padding: var(--ab-sheet-pad);
  margin-block: clamp(24px, 4vw, 48px);
  box-shadow: 0 24px 60px -40px rgba(0, 0, 0, 0.9);
}

.page-about .about-sheet__figure {
  margin: calc(var(--ab-sheet-pad) * -1) calc(var(--ab-sheet-pad) * -1) clamp(22px, 3vw, 34px);
  background: var(--ink-900);
  overflow: hidden;
}

.page-about .about-sheet__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}

.page-about .about-sheet__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: #5C6675;
  text-transform: uppercase;
}

.page-about .about-sheet__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4vw, 40px);
  line-height: 1.1;
  margin: 8px 0 0;
  color: var(--on-paper);
  max-width: 18ch;
}

.page-about .about-sheet__lede {
  margin: 12px 0 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.8;
  color: #444C59;
}

.page-about .about-tl {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0 0 0 26px;
  border-left: 1px solid var(--ab-paper-line);
}

.page-about .about-tl__item {
  position: relative;
  padding-bottom: clamp(22px, 3.5vw, 34px);
}

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

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 10px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--volt-green);
  box-shadow: 0 0 0 3px var(--paper-100);
}

.page-about .about-tl__year {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 700;
  color: var(--on-paper);
  line-height: 1;
}

.page-about .about-tl__year::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--volt-orange);
  opacity: 0.85;
}

.page-about .about-tl__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.3;
  color: var(--on-paper);
}

.page-about .about-tl__desc {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: #444C59;
  max-width: 56ch;
}

/* 错位图文 */
.page-about .about-split {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .about-split__text {
  margin-top: 0;
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--ink-700);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .about-figure__cap {
  padding: 10px 14px;
  border-top: 1px solid var(--ink-700);
  font-size: 12px;
  line-height: 1.6;
  color: var(--gray-400);
}

/* 数据流程图 */
.page-about .about-flowwrap {
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: clamp(16px, 3vw, 28px);
  border: 1px solid var(--ink-700);
  background: var(--ink-800);
}

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

.page-about .about-flow__edge {
  stroke: var(--ink-700);
}

.page-about .about-flow__dot circle {
  fill: var(--gray-400);
  transition: fill var(--dur) var(--ease);
}

.page-about .about-flow__dot circle:hover {
  fill: var(--volt-orange);
}

.page-about .about-flow__core {
  fill: var(--ink-900);
  stroke: var(--volt-green);
  stroke-width: 1.5;
}

.page-about .about-flow__out {
  fill: var(--volt-green);
}

.page-about .about-flow__label {
  fill: var(--volon, var(--white));
  fill: var(--white);
  font-family: var(--font-body);
  font-size: 14px;
  letter-spacing: 0.06em;
}

.page-about .about-flow__cap {
  margin: 14px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--gray-400);
}

/* 团队职责卡 */
.page-about .about-role-grid {
  display: grid;
  gap: 1px;
  margin-top: clamp(24px, 4vw, 36px);
  background: var(--ink-700);
  border: 1px solid var(--ink-700);
}

.page-about .about-role {
  background: var(--ink-900);
  padding: clamp(18px, 3vw, 26px);
  transition: background-color var(--dur) var(--ease);
}

.page-about .about-role:hover {
  background: var(--ink-800);
}

.page-about .about-role__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--volt-green);
}

.page-about .about-role__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  color: var(--white);
}

.page-about .about-role__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--gray-400);
}

/* 纠错操作 */
.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(18px, 3vw, 26px);
}

/* 规模数字 */
.page-about .about-scale {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(20px, 3vw, 30px);
  background: var(--ink-700);
  border: 1px solid var(--ink-700);
}

.page-about .about-scale__item {
  background: var(--ink-900);
  padding: clamp(16px, 3vw, 26px) clamp(14px, 2.4vw, 20px);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-scale__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(28px, 5vw, 46px);
  line-height: 1;
  color: var(--volt-green);
  letter-spacing: -0.02em;
}

.page-about .about-scale__label {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--gray-400);
}

.page-about .about-scale__note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--gray-400);
  max-width: 50ch;
}

/* 去向链接 */
.page-about .about-next {
  display: grid;
  gap: 1px;
  margin-top: clamp(20px, 3vw, 32px);
  background: var(--ink-700);
  border: 1px solid var(--ink-700);
}

.page-about .about-next__item {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "kicker arrow"
    "title arrow";
  align-items: center;
  gap: 4px 12px;
  padding: 18px;
  background: var(--ink-900);
  text-decoration: none;
  color: var(--white);
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-next__item:hover,
.page-about .about-next__item:focus-visible {
  background: var(--ink-800);
  box-shadow: inset 3px 0 0 var(--volt-green);
}

.page-about .about-next__kicker {
  grid-area: kicker;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gray-400);
  text-transform: uppercase;
}

.page-about .about-next__title {
  grid-area: title;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.2;
}

.page-about .about-next__arrow {
  grid-area: arrow;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--volt-green);
  transition: transform var(--dur) var(--ease);
}

.page-about .about-next__item:hover .about-next__arrow {
  transform: translateX(4px);
}

@media (min-width: 640px) {
  .page-about .about-role-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 820px) {
  .page-about .about-scale {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  }

  .page-about .about-split--reverse .about-split__figure {
    order: -1;
  }

  .page-about .about-split__figure {
    transform: translateY(6px);
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: 172px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 80px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__link {
    border: 0;
    border-left: 1px solid var(--ink-700);
    padding: 9px 0 9px 14px;
    background: none;
  }

  .page-about .about-index__link[data-active] {
    background: none;
    color: var(--volt-green);
    border-left-color: var(--volt-green);
  }

  .page-about .about-hero__stat {
    padding: 20px 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-next__arrow,
  .page-about .about-role,
  .page-about .about-index__link {
    transition: none;
  }

  .page-about .about-split__figure {
    transform: none;
  }
}
</main>

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