.page-about {
  --about-gap: clamp(64px, 9vw, 132px);
  position: relative;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(18px, 2.6vw, 32px) var(--gutter) 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--slate-500);
}
.page-about .about-crumb a {
  color: var(--paper-400);
  text-decoration: none;
}
.page-about .about-crumb a:hover {
  color: var(--cyan-400);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(44px, 6.5vw, 92px) var(--gutter) clamp(58px, 8vw, 118px);
  overflow: hidden;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: min(520px, 70vw);
  height: min(520px, 70vw);
  background: radial-gradient(circle at 65% 45%, rgba(59, 224, 209, 0.15), rgba(5, 7, 11, 0) 66%);
  pointer-events: none;
}
.page-about .about-hero__eyebrow {
  position: relative;
  display: block;
  margin: 0 0 clamp(16px, 2.4vw, 28px);
  color: var(--cyan-400);
}
.page-about .about-hero__title {
  position: relative;
  margin: 0 0 clamp(24px, 3.4vw, 42px);
  max-width: 12em;
  font-size: clamp(36px, 7.6vw, 88px);
  font-weight: 800;
  line-height: 1.09;
  letter-spacing: -0.02em;
  color: var(--paper-000);
}
.page-about .about-hero__lede {
  position: relative;
  max-width: 42ch;
  margin: 0 0 clamp(30px, 4.2vw, 50px);
  font-size: clamp(17px, 1.35vw, 20px);
  line-height: 1.78;
  color: var(--paper-400);
}
.page-about .about-hero__meta {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 28px;
  padding-top: clamp(20px, 2.6vw, 30px);
  border-top: 1px solid var(--line-600);
}
.page-about .about-hero__note {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--slate-500);
}

/* ---------- 主结构 ---------- */
.page-about .about-shell {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  gap: clamp(30px, 4vw, 60px);
}

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

.page-about .about-stream {
  display: flex;
  flex-direction: column;
  gap: var(--about-gap);
  padding-bottom: clamp(56px, 8vw, 120px);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  border-top: 1px solid var(--line-600);
  padding-top: clamp(28px, 4vw, 52px);
}
.page-about .about-chapter__head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(24px, 3.6vw, 48px);
}
.page-about .about-chapter__title {
  margin: 0;
  max-width: 22ch;
  font-size: clamp(25px, 3.5vw, 44px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--paper-000);
}
.page-about .about-chapter__head .index {
  color: var(--cyan-400);
}
.page-about .about-chapter__row {
  display: grid;
  gap: clamp(30px, 4.5vw, 58px);
  align-items: start;
}
.page-about .about-chapter__text {
  min-width: 0;
}
.page-about .about-chapter__text .prose {
  max-width: 64ch;
}
.page-about .about-chapter__text .lede {
  margin-bottom: clamp(20px, 2.8vw, 32px);
}
.page-about .about-chapter__extra {
  min-width: 0;
}
.page-about .about-chapter--full .about-chapter__text .lede {
  max-width: 54ch;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
}
.page-about .about-figure__box {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-600);
  border-radius: var(--radius-lg);
  background: var(--ink-800);
}
.page-about .about-figure__box::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(59, 224, 209, 0.12), rgba(5, 7, 11, 0) 58%);
  pointer-events: none;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}
.page-about .about-figure figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.72;
  letter-spacing: 0.04em;
  color: var(--slate-500);
}
.page-about .about-figure--wide {
  margin: 0 0 clamp(26px, 3.4vw, 44px);
}

/* ---------- 三层结构 ---------- */
.page-about .about-strata {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-strata__item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 18px 0;
  border-top: 1px solid var(--line-600);
}
.page-about .about-strata__item:last-child {
  border-bottom: 1px solid var(--line-600);
}
.page-about .about-strata__num {
  grid-row: span 2;
  align-self: start;
  padding-top: 3px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan-400);
}
.page-about .about-strata__name {
  font-size: 17px;
  font-weight: 700;
  color: var(--paper-000);
}
.page-about .about-strata__desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper-400);
}

/* ---------- 团队分组 ---------- */
.page-about .about-teams {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-team {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 0;
  border-top: 1px solid var(--line-600);
  transition: border-color 0.2s var(--ease);
}
.page-about .about-team:last-child {
  border-bottom: 1px solid var(--line-600);
}
.page-about .about-team__num {
  padding-top: 3px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--slate-500);
  transition: color 0.2s var(--ease);
}
.page-about .about-team__name {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper-000);
}
.page-about .about-team__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--paper-400);
}
.page-about .about-team:hover .about-team__num,
.page-about .about-team:focus-within .about-team__num {
  color: var(--cyan-400);
}

/* ---------- 复核节奏 ---------- */
.page-about .about-cadence {
  margin: 0 0 clamp(24px, 3.2vw, 40px);
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
}
.page-about .about-cadence__item {
  display: grid;
  gap: 6px;
  padding: 20px 0 20px 18px;
  border-left: 2px solid var(--cyan-700);
  background: linear-gradient(90deg, rgba(18, 99, 95, 0.22), rgba(5, 7, 11, 0) 72%);
}
.page-about .about-cadence__freq {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan-400);
}
.page-about .about-cadence__name {
  font-size: 18px;
  font-weight: 700;
  color: var(--paper-000);
}
.page-about .about-cadence__desc {
  font-size: 14px;
  line-height: 1.72;
  color: var(--paper-400);
}

/* ---------- 更新时间卡 ---------- */
.page-about .about-stampcard {
  margin: 0;
  border: 1px solid var(--line-600);
  border-radius: var(--radius-lg);
  background: var(--ink-800);
  padding: clamp(20px, 2.6vw, 30px);
}
.page-about .about-stampcard__row {
  display: grid;
  gap: 6px;
  padding: 15px 0;
  border-top: 1px solid var(--line-600);
}
.page-about .about-stampcard__row:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .about-stampcard__row:last-child {
  padding-bottom: 0;
}
.page-about .about-stampcard dt {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--amber-400);
}
.page-about .about-stampcard dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--paper-000);
}

/* ---------- 本地服务数据 ---------- */
.page-about .about-localstats {
  margin: 0 0 clamp(22px, 3vw, 34px);
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
}
.page-about .about-localstats__item {
  display: grid;
  gap: 4px;
  padding: 16px 0;
  border-top: 1px solid var(--line-600);
}
.page-about .about-localstats__item:last-child {
  border-bottom: 1px solid var(--line-600);
}
.page-about .about-localstats__k {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--slate-500);
}
.page-about .about-localstats__v {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper-000);
}
.page-about .about-localstats__d {
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper-400);
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter) clamp(64px, 9vw, 130px);
}
.page-about .about-next__label {
  display: block;
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--amber-400);
}
.page-about .about-next__title {
  margin: 0 0 16px;
  max-width: 20ch;
  font-size: clamp(24px, 3.2vw, 40px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--paper-000);
}
.page-about .about-next__desc {
  margin: 0 0 clamp(24px, 3.2vw, 36px);
  max-width: 48ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--paper-400);
}
.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 中等屏 ---------- */
@media (min-width: 720px) {
  .page-about .about-chapter__head {
    grid-template-columns: 68px minmax(0, 1fr);
    gap: 0 24px;
    align-items: start;
  }
  .page-about .about-chapter__head .index {
    padding-top: 9px;
  }
  .page-about .about-cadence {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }
  .page-about .about-cadence__item {
    padding: 20px 18px;
    border-left: 0;
    border-top: 2px solid var(--cyan-700);
    background: none;
  }
  .page-about .about-cadence__item + .about-cadence__item {
    border-left: 1px solid var(--line-600);
  }
}

/* ---------- 宽屏双栏 ---------- */
@media (min-width: 1000px) {
  .page-about .about-chapter__row {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: clamp(40px, 5vw, 76px);
  }
  .page-about .about-chapter--wide-side .about-chapter__row {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  }
  .page-about .about-chapter--full .about-chapter__row {
    grid-template-columns: minmax(0, 1fr);
  }
  .page-about .about-localstats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }
  .page-about .about-localstats__item {
    border-top: 1px solid var(--line-600);
    border-bottom: 1px solid var(--line-600);
    padding: 18px 20px 18px 0;
  }
  .page-about .about-localstats__item + .about-localstats__item {
    border-left: 1px solid var(--line-600);
    padding-left: 20px;
  }
}

/* ---------- 侧边锚点常驻 ---------- */
@media (min-width: 1120px) {
  .page-about .about-shell {
    grid-template-columns: 152px minmax(0, 1fr);
    gap: clamp(40px, 5vw, 76px);
  }
  .page-about .about-anchors {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 32px);
    align-self: start;
    padding-top: clamp(28px, 4vw, 52px);
  }
  .page-about .about-anchors__link {
    display: block;
    padding: 11px 0 11px 16px;
    border-left: 1px solid var(--line-600);
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.04em;
    color: var(--paper-400);
    text-decoration: none;
    transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
  }
  .page-about .about-anchors__link:hover {
    color: var(--paper-000);
  }
  .page-about .about-anchors__link.is-active {
    color: var(--cyan-400);
    border-left-color: var(--cyan-400);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team,
  .page-about .about-team__num,
  .page-about .about-anchors__link {
    transition: none;
  }
}