.page-about {
  --about-gap: clamp(20px, 3vw, 40px);
  --about-gap-lg: clamp(32px, 5vw, 72px);
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-sans);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.page-about h2 {
  font-size: clamp(26px, 3.4vw, 44px);
  line-height: 1.14;
  margin: 0 0 18px;
}

.page-about .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.page-about .section {
  padding-block: clamp(48px, 7vw, 100px);
}

.page-about .section--paper {
  background: var(--paper);
  color: var(--char);
}

.page-about .note {
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--mist);
  max-width: 30em;
  margin: 0;
}

.page-about .section--paper .note {
  color: var(--moss);
}

/* 面包屑 */
.page-about .breadcrumbs {
  padding-top: clamp(16px, 3vw, 30px);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .breadcrumbs__link {
  color: var(--mist);
  text-decoration: none;
}

.page-about .breadcrumbs__link:hover {
  color: var(--lime);
}

.page-about .breadcrumbs__sep {
  margin-inline: 8px;
  color: rgba(169, 195, 184, 0.55);
}

.page-about .breadcrumbs__current {
  color: var(--lime-soft);
}

/* 章节编号 */
.page-about .about-chapter {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 14px;
}

.page-about .about-chapter__no {
  font-size: clamp(26px, 3.4vw, 44px);
  line-height: 1;
  color: var(--lime);
}

.page-about .about-chapter__label {
  font-size: var(--fs-12);
  letter-spacing: 0.22em;
  color: var(--mist);
}

.page-about .section--paper .about-chapter__no {
  color: var(--ink-3);
}

.page-about .section--paper .about-chapter__label {
  color: var(--moss);
}

.page-about .annotation {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--mist);
  margin: 0;
}

.page-about .annotation::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--lime);
  flex: 0 0 auto;
}

.page-about .annotation--tilt {
  transform: rotate(-4deg);
  transform-origin: left center;
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding-bottom: clamp(8px, 2vw, 20px);
  background:
    radial-gradient(1100px 520px at 88% -10%, rgba(23, 80, 63, 0.75), transparent 62%),
    var(--ink);
}

.page-about .about-hero__grid {
  display: grid;
  gap: var(--about-gap-lg);
  align-items: end;
  padding-top: clamp(18px, 3vw, 36px);
}

.page-about .about-hero__title {
  font-size: clamp(32px, 6.4vw, 64px);
  line-height: 1.06;
  font-weight: 900;
  margin: 14px 0 0;
  max-width: 16em;
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: rgba(247, 244, 234, 0.84);
  max-width: 34em;
}

.page-about .about-hero__figure {
  margin: 0;
  align-self: end;
}

.page-about .about-hero__figure .media-frame__caption {
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
}

/* 数据条 */
.page-about .about-hero__stats {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: clamp(24px, 4vw, 34px);
}

.page-about .about-hero__stats .data-card,
.page-about .about-verify__cards .data-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--r-xs);
  transition: border-color 200ms ease-out, transform 200ms ease-out;
}

.page-about .about-hero__stats .data-card:hover,
.page-about .about-verify__cards .data-card:hover {
  border-color: var(--lime);
  transform: translateY(-3px);
}

.page-about .about-hero__stats .data-card__label,
.page-about .about-verify__cards .data-card__label {
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .about-hero__stats .data-card__value,
.page-about .about-verify__cards .data-card__value {
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.05;
  color: var(--lime);
}

.page-about .about-hero__stats .data-card__note,
.page-about .about-verify__cards .data-card__note {
  font-size: var(--fs-12);
  line-height: 1.5;
  color: rgba(169, 195, 184, 0.82);
}

.page-about .about-hero__stats .data-card--amber .data-card__value {
  color: var(--amber);
}

.page-about .about-hero__stats .data-card--amber {
  background: rgba(245, 166, 35, 0.1);
  border-color: rgba(245, 166, 35, 0.42);
}

/* 章节索引 */
.page-about .about-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: clamp(22px, 3vw, 34px);
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--mist);
  text-decoration: none;
  padding-block: 4px;
  transition: color 160ms ease-out;
}

.page-about .about-index__no {
  color: rgba(200, 255, 62, 0.7);
  font-size: var(--fs-12);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--lime);
}

/* 起点 */
.page-about .about-origin__grid {
  display: grid;
  gap: var(--about-gap-lg);
  align-items: start;
}

.page-about .about-origin__body p {
  font-size: var(--fs-17);
  line-height: 1.85;
  color: rgba(247, 244, 234, 0.82);
  max-width: 34em;
  margin: 0 0 16px;
}

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

.page-about .about-quote {
  background: var(--paper);
  color: var(--char);
  border-left: 4px solid var(--lime);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  padding: clamp(20px, 3vw, 30px);
}

.page-about .about-quote__text {
  margin: 0;
  font-size: var(--fs-22);
  line-height: 1.6;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-quote__cite {
  margin: 14px 0 0;
  font-size: var(--fs-12);
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--moss);
}

/* 原则 */
.page-about .about-principles__grid {
  display: grid;
  gap: var(--about-gap-lg);
  align-items: start;
}

.page-about .about-principles__list {
  display: grid;
  gap: 12px;
}

.page-about .about-principles__list .accordion__item {
  background: rgba(14, 49, 41, 0.05);
  border: 1px solid var(--line-dark);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: border-color 200ms ease-out, background 200ms ease-out;
}

.page-about .about-principles__list .accordion__item:hover,
.page-about .about-principles__list .accordion__item:focus-within {
  border-color: var(--ink-3);
  background: rgba(23, 80, 63, 0.08);
}

.page-about .accordion__button {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 44px;
  padding: 18px 20px;
  background: none;
  border: 0;
  font: inherit;
  font-weight: 700;
  font-size: var(--fs-17);
  line-height: 1.4;
  color: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .accordion__button:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -2px;
}

.page-about .about-principles__no {
  font-size: var(--fs-14);
  color: var(--ink-3);
  flex: 0 0 auto;
}

.page-about .about-principles__name {
  flex: 1 1 auto;
}

.page-about .accordion__sign {
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  transition: transform 260ms ease;
  margin-left: auto;
}

.page-about .accordion__item[data-open] .accordion__sign {
  transform: rotate(225deg);
}

.page-about .accordion__panel-inner {
  padding: 0 20px 20px;
}

.page-about .accordion__panel-inner p {
  font-size: var(--fs-17);
  line-height: 1.85;
  max-width: 34em;
  margin: 0 0 12px;
}

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

/* 时间线 */
.page-about .about-timeline {
  background:
    linear-gradient(180deg, rgba(14, 49, 41, 0.85), rgba(8, 33, 27, 0.95)),
    var(--ink);
}

.page-about .about-timeline__wrap {
  position: relative;
}

.page-about .about-timeline__rail {
  display: none;
}

.page-about .about-timeline__head {
  max-width: 40em;
  margin-bottom: clamp(24px, 3.5vw, 40px);
}

.page-about .about-timeline__list {
  position: relative;
  display: grid;
  gap: 6px;
  padding-left: 34px;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: var(--ink-3);
}

.page-about .about-timeline__item {
  position: relative;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 22px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 4px var(--ink-2);
  z-index: 1;
}

.page-about .about-timeline__list .accordion__item {
  border: 1px solid var(--line-soft);
  border-radius: var(--r-xs);
  background: rgba(23, 80, 63, 0.28);
  transition: border-color 200ms ease-out;
}

.page-about .about-timeline__list .accordion__item:hover,
.page-about .about-timeline__list .accordion__item:focus-within {
  border-color: var(--lime);
}

.page-about .about-timeline__button {
  padding: 16px 18px;
}

.page-about .about-timeline__year {
  flex: 0 0 auto;
  font-size: var(--fs-22);
  color: var(--lime);
  letter-spacing: 0;
}

.page-about .about-timeline__label {
  flex: 1 1 auto;
  font-size: var(--fs-17);
  color: var(--paper);
}

.page-about .about-timeline__list .accordion__panel-inner {
  padding: 0 18px 18px;
  color: rgba(247, 244, 234, 0.82);
}

/* 数据流程 */
.page-about .about-verify {
  background: var(--ink-2);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-verify__grid {
  display: grid;
  gap: var(--about-gap-lg);
  align-items: start;
}

.page-about .about-verify__figure {
  margin: 0;
}

.page-about .about-verify__figure .media-frame__caption {
  font-size: var(--fs-12);
}

.page-about .about-steps {
  list-style: none;
  margin: 0 0 clamp(20px, 3vw, 30px);
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .about-steps__no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--lime);
  color: var(--char);
  font-size: var(--fs-14);
  font-weight: 700;
}

.page-about .about-steps__title {
  margin: 0 0 6px;
  font-size: var(--fs-17);
  font-weight: 700;
  color: var(--lime-soft);
}

.page-about .about-steps__desc {
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: rgba(247, 244, 234, 0.8);
  max-width: 32em;
}

.page-about .about-verify__cards {
  display: grid;
  gap: 10px;
}

/* 团队 */
.page-about .about-team__head {
  display: grid;
  gap: 16px;
  align-items: end;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .about-team__head-note {
  max-width: 34em;
}

.page-about .about-team__bars {
  list-style: none;
  margin: 0 0 clamp(28px, 4vw, 48px);
  padding: 0;
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}

.page-about .about-team__bar-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.page-about .about-team__name {
  font-size: var(--fs-17);
  font-weight: 700;
  color: var(--char);
}

.page-about .about-team__count {
  font-size: var(--fs-22);
  color: var(--ink-3);
}

.page-about .about-team__track {
  height: 10px;
  border-radius: var(--r-pill);
  background: rgba(19, 26, 23, 0.09);
  border: 1px solid var(--line-dark);
  overflow: hidden;
}

.page-about .about-team__fill {
  display: block;
  height: 100%;
  border-radius: var(--r-pill);
  background: linear-gradient(90deg, var(--ink-3), var(--lime));
}

.page-about .about-team__fill--a {
  width: 40%;
}

.page-about .about-team__fill--b {
  width: 29%;
}

.page-about .about-team__fill--c {
  width: 19%;
}

.page-about .about-team__fill--d {
  width: 13%;
}

.page-about .about-team__desc {
  margin: 10px 0 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--moss);
  max-width: 32em;
}

.page-about .about-team__band {
  margin: 0;
}

.page-about .about-team__band .media-frame__caption {
  font-size: var(--fs-12);
}

/* 结尾 */
.page-about .about-close {
  background:
    radial-gradient(900px 420px at 12% 0%, rgba(23, 80, 63, 0.6), transparent 60%),
    var(--ink);
}

.page-about .about-close__grid {
  display: grid;
  gap: var(--about-gap-lg);
  align-items: start;
}

.page-about .about-close__text {
  margin: 0 0 22px;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: rgba(247, 244, 234, 0.82);
  max-width: 30em;
}

.page-about .about-close__links {
  display: grid;
  gap: 10px;
}

.page-about .about-close__entry {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  grid-template-areas:
    "no title"
    "no desc"
    "no meta";
  gap: 4px 14px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-xs);
  background: rgba(23, 80, 63, 0.3);
  text-decoration: none;
  color: inherit;
  transition: border-color 200ms ease-out, transform 200ms ease-out;
}

.page-about .about-close__entry:hover,
.page-about .about-close__entry:focus-visible {
  border-color: var(--lime);
  transform: translateX(6px);
}

.page-about .about-close__entry .entry__no {
  grid-area: no;
  font-size: var(--fs-22);
  color: var(--lime);
  line-height: 1.2;
}

.page-about .about-close__entry .entry__title {
  grid-area: title;
  font-size: var(--fs-17);
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-close__entry .entry__desc {
  grid-area: desc;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: rgba(247, 244, 234, 0.74);
}

.page-about .about-close__entry .entry__meta {
  grid-area: meta;
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--mist);
}

/* 平板及以上 */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
    margin-top: -48px;
  }

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

  .page-about .about-team__head {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: var(--about-gap);
  }

  .page-about .about-team__bars {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px 40px;
  }
}

/* 桌面 */
@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: var(--about-gap);
  }

  .page-about .about-principles__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: var(--about-gap);
  }

  .page-about .about-principles__side {
    position: sticky;
    top: 96px;
  }

  .page-about .about-timeline__wrap {
    display: grid;
    grid-template-columns: 48px minmax(0, 720px);
    gap: 0 clamp(20px, 4vw, 56px);
    justify-content: start;
  }

  .page-about .about-timeline__rail {
    display: block;
    grid-row: 1 / span 2;
    writing-mode: vertical-rl;
    transform: rotate(180deg) translateX(-4deg);
    letter-spacing: 0.28em;
    color: rgba(169, 195, 184, 0.72);
    padding-top: 8px;
  }

  .page-about .about-timeline__rail::before {
    width: 1px;
    height: 28px;
  }

  .page-about .about-timeline__head,
  .page-about .about-timeline__list {
    grid-column: 2;
  }

  .page-about .about-verify__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: var(--about-gap);
  }

  .page-about .about-verify__figure {
    position: sticky;
    top: 96px;
  }

  .page-about .about-close__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: var(--about-gap);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .data-card,
  .page-about .accordion__sign,
  .page-about .about-close__entry,
  .page-about .about-index__link {
    transition: none;
  }

  .page-about .annotation--tilt,
  .page-about .about-timeline__rail {
    transform: none;
  }
}