.page-about {
  --about-rail-w: 212px;
  --about-rule: rgba(30, 42, 71, 0.9);
  background-color: var(--ink);
  color: var(--silver);
  font-family: var(--sans);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-block-start: 26px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: 30px 44px;
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset-block-start: -42%;
  inset-inline-end: -22%;
  width: 66%;
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at center, rgba(122, 92, 255, 0.34), rgba(122, 92, 255, 0) 66%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  max-width: 860px;
}

.page-about .about-hero__eyebrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 20px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 22px;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(31px, 7vw, 62px);
  line-height: 1.12;
  letter-spacing: -0.022em;
  color: var(--white);
  text-wrap: balance;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--silver);
}

/* ---------- 数字条 ---------- */
.page-about .about-statband {
  border-block: 1px solid var(--line);
  background-color: var(--layer);
  padding-block: 26px;
}

.page-about .about-statband__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 16px;
}

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

.page-about .about-stat__num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(23px, 4.6vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat:nth-child(1) .about-stat__num { color: var(--amber); }
.page-about .about-stat:nth-child(2) .about-stat__num { color: var(--cyan); }
.page-about .about-stat:nth-child(3) .about-stat__num { color: var(--nebula); }

.page-about .about-stat__label {
  display: block;
  margin-block-start: 9px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--silver);
  opacity: 0.76;
}

/* ---------- 左右分置 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  padding-block: 52px 0;
}

.page-about .about-rail__title {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--silver);
  opacity: 0.58;
}

.page-about .about-rail__list {
  display: flex;
  flex-wrap: nowrap;
  gap: 8px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 13px;
  border: 1px solid var(--line);
  font-size: 13.5px;
  line-height: 1.2;
  color: var(--silver);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.3s ease, border-color 0.3s ease, background-color 0.3s ease;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--white);
  border-color: var(--cyan);
  background-color: rgba(63, 224, 208, 0.07);
}

.page-about .about-rail__num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--nebula);
  font-variant-numeric: tabular-nums;
}

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

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding-block-end: 56px;
  scroll-margin-top: calc(var(--header-h) + 26px);
}

.page-about .about-chapter + .about-chapter {
  border-block-start: 1px solid var(--about-rule);
  padding-block-start: 54px;
}

.page-about .about-chapter .section__index {
  display: block;
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-chapter .section__title {
  margin: 0 0 16px;
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(22px, 4.2vw, 34px);
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--white);
}

.page-about .about-chapter .section__lead {
  margin: 0 0 26px;
  max-width: 64ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-prose p {
  margin: 0 0 17px;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-prose p:last-child {
  margin-block-end: 0;
}

.page-about .about-prose--after {
  margin-block-start: 28px;
}

.page-about .about-inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-block-end: 1px solid rgba(63, 224, 208, 0.42);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--white);
  border-block-end-color: var(--white);
}

/* ---------- 四栏分工 ---------- */
.page-about .about-columns {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-columns__item {
  padding: 22px 0 22px 16px;
  border-inline-start: 2px solid var(--line);
  transition: border-color 0.3s ease;
}

.page-about .about-columns__item:hover {
  border-inline-start-color: var(--cyan);
}

.page-about .about-columns__tag {
  display: inline-block;
  margin-block-end: 9px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--nebula);
}

.page-about .about-columns__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.01em;
}

.page-about .about-columns__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver);
  opacity: 0.9;
}

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

/* ---------- 奶油展签卡片 ---------- */
.page-about .about-roles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-block-start: 26px;
}

.page-about .about-role {
  background-color: var(--cream);
  color: var(--ink-brown);
  padding: 20px 18px 22px;
  border-inline-start: 3px solid var(--amber);
}

.page-about .about-role__label {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-brown);
  opacity: 0.58;
}

.page-about .about-role__title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink-brown);
}

.page-about .about-roles .about-role__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(20, 16, 12, 0.82);
}

.page-about .about-note {
  margin-block-start: 28px;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 4px 0 0 30px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  inset-block: 10px 40px;
  inset-inline-start: 7px;
  width: 1px;
  background: linear-gradient(180deg, var(--nebula), var(--cyan) 42%, var(--line) 88%);
}

.page-about .about-timeline .timeline__item {
  position: relative;
  padding-block-end: 34px;
}

.page-about .about-timeline .timeline__item::before {
  content: "";
  position: absolute;
  inset-inline-start: -30px;
  inset-block-start: 5px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background-color: var(--ink);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(63, 224, 208, 0.09);
}

.page-about .about-timeline .timeline__time {
  display: block;
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .about-timeline .timeline__title {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.012em;
}

.page-about .about-timeline .timeline__text {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-timeline .disclosure {
  margin-block-start: 13px;
}

.page-about .about-timeline .disclosure__btn {
  padding: 8px 15px;
  border: 1px solid var(--line);
  background-color: transparent;
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: border-color 0.3s ease, background-color 0.3s ease, color 0.3s ease;
}

.page-about .about-timeline .disclosure__btn:hover,
.page-about .about-timeline .disclosure__btn:focus-visible {
  border-color: var(--cyan);
  background-color: rgba(63, 224, 208, 0.08);
  color: var(--white);
}

.page-about .about-timeline .disclosure__panel {
  margin-block-start: 14px;
  padding: 15px 17px;
  background-color: var(--layer);
  border-inline-start: 2px solid var(--nebula);
}

.page-about .about-timeline .disclosure__panel p {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-timeline__shot {
  position: relative;
  padding-block-end: 34px;
}

.page-about .about-timeline__shot::before {
  display: none;
}

.page-about .about-timeline__shot .about-shot {
  margin: 0;
}

/* ---------- 三条承诺 ---------- */
.page-about .about-pledges {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-pledge {
  padding: 22px 0;
  border-block-start: 1px solid var(--about-rule);
}

.page-about .about-pledge:last-child {
  border-block-end: 1px solid var(--about-rule);
}

.page-about .about-pledge__num {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--nebula);
  font-variant-numeric: tabular-nums;
}

.page-about .about-pledge__title {
  margin: 8px 0 9px;
  font-size: 19px;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.012em;
}

.page-about .about-pledge__text {
  margin: 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--silver);
}

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-block-start: 30px;
}

/* ---------- 本地运营 ---------- */
.page-about .about-local {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

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

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

.page-about .about-plate {
  margin-block-start: 24px;
}

.page-about .about-plate .plate__text + .plate__text {
  margin-block-start: 7px;
}

/* ---------- 留黑区 ---------- */
.page-about .about-hold {
  margin-block-start: 24px;
  padding-block: 74px;
  position: relative;
  overflow: hidden;
}

.page-about .about-hold::before {
  content: "";
  position: absolute;
  inset-block: 0;
  inset-inline-start: 0;
  width: 100%;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(30, 42, 71, 0.85) 0,
    rgba(30, 42, 71, 0.85) 1px,
    transparent 1px,
    transparent 88px
  );
  pointer-events: none;
  opacity: 0.6;
}

.page-about .about-hold__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hold__line {
  margin: 0;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(28px, 7.4vw, 64px);
  line-height: 1.14;
  letter-spacing: -0.028em;
  color: var(--white);
  text-wrap: balance;
}

.page-about .about-hold__sub {
  margin: 26px 0 0;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.28em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-statband__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-columns {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 36px;
  }

  .page-about .about-pledges {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    column-gap: 30px;
  }

  .page-about .about-pledge {
    border-block-end: 1px solid var(--about-rule);
  }

  .page-about .about-local {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 34px;
    align-items: start;
  }
}

/* ---------- 桌面：左右分置 + 粘性索引 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero {
    padding-block: 44px 56px;
  }

  .page-about .about-split {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 76px;
    padding-block: 64px 0;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 34px);
    align-self: start;
  }

  .page-about .about-rail__list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2px;
    overflow-x: visible;
    padding-block-end: 0;
  }

  .page-about .about-rail__link {
    border: 0;
    border-inline-start: 2px solid transparent;
    padding: 9px 10px;
    white-space: normal;
    transition: color 0.3s ease, border-color 0.3s ease, background-color 0.3s ease;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-inline-start-color: var(--cyan);
    background-color: rgba(63, 224, 208, 0.06);
  }

  .page-about .about-hold {
    padding-block: 104px;
  }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-columns__item,
  .page-about .about-timeline .disclosure__btn {
    transition: none;
  }
}