.page-about {
  --about-hair: rgba(140, 147, 163, 0.22);
  --about-cyan-hair: rgba(55, 200, 195, 0.38);
  --about-body-text: rgba(244, 241, 234, 0.8);
  background: var(--ink);
  color: var(--snow);
  font-family: var(--font-body);
  padding-bottom: 76px;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin-top: 26px;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  opacity: 0.5;
}

.page-about .breadcrumb__link {
  color: var(--mist);
  text-decoration: none;
  transition: color 180ms ease;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 30px 0 0;
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--about-hair);
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .about-hero h1 {
  margin: 26px 0 0;
  max-width: 16ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6.4vw, 72px);
  line-height: 1.06;
  letter-spacing: -0.025em;
  color: var(--snow);
}

.page-about .about-hero h1 em {
  font-style: normal;
  color: var(--cyan);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.92;
  color: var(--about-body-text);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 38px 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-hair);
  border-top: 1px solid var(--about-hair);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-stat {
  background: var(--ink);
  padding: 18px 14px 20px;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-data);
  font-weight: 600;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--snow);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  margin-top: 54px;
}

/* ---------- 章节索引栏 ---------- */
.page-about .about-rail {
  display: none;
}

.page-about .about-rail__label {
  display: block;
  margin-bottom: 16px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--mist);
}

.page-about .about-rail__list {
  display: flex;
  flex-direction: column;
  gap: 13px;
  margin: 0;
  padding: 0;
  list-style: none;
}

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

.page-about .about-rail__item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 6px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--cyan);
  transition: background-color 180ms ease, border-color 180ms ease;
}

.page-about .about-rail__item:hover::before {
  background: var(--gold);
  border-color: var(--gold);
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  color: var(--mist);
  font-size: 13px;
  line-height: 1.45;
  text-decoration: none;
  transition: color 180ms ease;
}

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

.page-about .about-rail__num {
  font-family: var(--font-data);
  font-size: 11px;
  color: var(--cyan);
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  position: relative;
  padding-top: 40px;
  scroll-margin-top: 120px;
}

.page-about .about-chapter + .about-chapter {
  margin-top: 46px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-chapter__ghost {
  position: absolute;
  top: 16px;
  right: 0;
  font-family: var(--font-data);
  font-weight: 700;
  font-size: clamp(76px, 15vw, 164px);
  line-height: 0.8;
  letter-spacing: -0.05em;
  color: rgba(244, 241, 234, 0.05);
  pointer-events: none;
  user-select: none;
}

.page-about .section-index {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--cyan);
}

.page-about .about-chapter__title {
  position: relative;
  margin: 14px 0 0;
  max-width: 21ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.3vw, 36px);
  line-height: 1.24;
  letter-spacing: -0.015em;
  color: var(--snow);
}

.page-about .about-chapter__lead {
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: 16.5px;
  line-height: 1.92;
  color: rgba(244, 241, 234, 0.92);
}

.page-about .about-chapter__body {
  margin-top: 4px;
}

.page-about .about-chapter__body > p {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.92;
  color: var(--about-body-text);
}

.page-about .about-sub {
  margin: 34px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.5;
  color: var(--snow);
}

.page-about .about-chapter__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(55, 200, 195, 0.35);
  transition: color 180ms ease, border-color 180ms ease;
}

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

/* ---------- 三级复核流程 ---------- */
.page-about .about-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow__step {
  position: relative;
  padding-top: 20px;
  border-top: 1px solid var(--about-cyan-hair);
}

.page-about .about-flow__num {
  display: block;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

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

.page-about .about-flow__step p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-body-text);
}

/* ---------- 图片框景 ---------- */
.page-about .about-figure {
  margin: 28px 0 0;
  padding: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-soft);
  background: var(--panel);
  object-fit: cover;
}

.page-about .about-figure--wide img {
  aspect-ratio: 14 / 9;
}

.page-about .about-figure--tall img {
  aspect-ratio: 4 / 3;
}

.page-about .about-figure--square img {
  aspect-ratio: 1 / 1;
}

.page-about .about-figure__caption {
  margin-top: 10px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

/* ---------- 图文并排 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-split__text p {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.92;
  color: var(--about-body-text);
}

.page-about .about-split__text p:first-child {
  margin-top: 16px;
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px 16px;
  padding: 18px 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-team__row:last-child {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-team__role {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  color: var(--snow);
}

.page-about .about-team__count {
  align-self: center;
  justify-self: end;
  font-family: var(--font-data);
  font-size: 14px;
  color: var(--gold);
}

.page-about .about-team__meter {
  grid-column: 1 / -1;
  height: 3px;
  background: var(--graphite);
  overflow: hidden;
}

.page-about .about-team__meter-fill {
  display: block;
  height: 100%;
}

.page-about .about-team__meter-fill--eval {
  width: 100%;
  background: var(--cyan);
}

.page-about .about-team__meter-fill--tech {
  width: 44%;
  background: var(--red-bright);
}

.page-about .about-team__meter-fill--service {
  width: 44%;
  background: var(--gold);
}

.page-about .about-team__meter-fill--ops {
  width: 22%;
  background: var(--mist);
}

.page-about .about-team__desc {
  grid-column: 1 / -1;
  margin: 4px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-timeline {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  margin: 32px 0 0;
  padding: 0 0 0 4px;
  list-style: none;
}

.page-about .about-timeline__node {
  position: relative;
  padding: 0 0 28px 24px;
  border-left: 1px solid var(--about-cyan-hair);
}

.page-about .about-timeline__node:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 7px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gold);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-timeline__text {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-body-text);
}

/* ---------- 新用户四类栏目 ---------- */
.page-about .about-cats {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cats li {
  display: grid;
  grid-template-columns: 66px minmax(0, 1fr);
  gap: 16px;
  padding: 15px 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-cats li:last-child {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-cats__key {
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-cats p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-body-text);
}

/* ---------- 合作与报告数据列 ---------- */
.page-about .about-facts {
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-facts__row {
  display: grid;
  grid-template-columns: minmax(0, 6.5rem) minmax(0, 1fr);
  gap: 18px;
  align-items: baseline;
  padding: 16px 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-facts__row:last-child {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-facts dt {
  font-family: var(--font-data);
  font-size: clamp(20px, 2.6vw, 28px);
  letter-spacing: -0.01em;
  color: var(--gold);
}

.page-about .about-facts dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-body-text);
}

/* ---------- 相关入口 ---------- */
.page-about .about-next {
  margin-top: 62px;
  padding-top: 32px;
  border-top: 1px solid var(--about-cyan-hair);
}

.page-about .about-next__lead {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  color: var(--snow);
}

.page-about .about-next__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
}

.page-about .about-next__list li {
  background: var(--ink);
  padding: 18px 18px 20px;
}

.page-about .about-next__list a {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  color: var(--snow);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
  transform: translateX(4px);
}

.page-about .about-next__list span {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 显现动效 ---------- */
@media (scripting: enabled) {
  .page-about [data-reveal] {
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 420ms ease, transform 420ms ease;
  }

  .page-about [data-reveal].is-visible {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about [data-reveal].is-visible {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .about-rail__item::before,
  .page-about .about-next__list a {
    transition: none;
  }
}

/* ---------- 断点：小屏到中屏 ---------- */
@media (min-width: 620px) {
  .page-about .about-facts__row {
    grid-template-columns: minmax(0, 7.5rem) minmax(0, 1fr);
    gap: 26px;
  }
}

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

  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }

  .page-about .about-flow__step::before {
    content: "";
    position: absolute;
    top: -3.5px;
    left: 0;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--gold);
  }

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

@media (min-width: 860px) {
  .page-about .about-split {
    column-gap: 36px;
    align-items: start;
  }

  .page-about .about-split--figure-left {
    grid-template-columns: minmax(0, 4fr) minmax(0, 6fr);
  }

  .page-about .about-split--figure-left .about-figure {
    grid-column: 1;
    grid-row: 1;
    margin-top: 22px;
  }

  .page-about .about-split--figure-left .about-split__text {
    grid-column: 2;
    grid-row: 1;
    margin-top: 22px;
  }

  .page-about .about-split--figure-right {
    grid-template-columns: minmax(0, 6fr) minmax(0, 4fr);
  }

  .page-about .about-split--figure-right .about-figure {
    margin-top: 22px;
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    column-gap: 28px;
  }

  .page-about .about-timeline__node:last-child {
    border-left-color: var(--about-cyan-hair);
  }
}

/* ---------- 断点：桌面 ---------- */
@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 166px minmax(0, 1fr);
    gap: 60px;
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 132px;
    padding-left: 18px;
    border-left: 1px solid var(--about-cyan-hair);
  }

  .page-about .about-chapter__ghost {
    top: 8px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-timeline {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    column-gap: 20px;
    padding-left: 0;
    border-top: 1px solid var(--about-cyan-hair);
  }

  .page-about .about-timeline__node {
    padding: 22px 14px 0 0;
    border-left: 0;
  }

  .page-about .about-timeline__node::before {
    top: -4.5px;
    left: 0;
  }

  .page-about .about-timeline__node:last-child {
    border-left-color: transparent;
  }
}