.page-about {
  --about-rule: 1px solid var(--hair);
  --about-rule-soft: 1px solid var(--hair-soft);
  --about-rule-dark: 1px solid rgba(26, 18, 8, .18);
  --about-dot: var(--cyan);
}

/* ---------- 通用标题与导语 ---------- */
.page-about .about-kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .about-kicker--dark {
  color: #9A5A16;
}

.page-about .about-h2 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(26px, 4.6vw, 42px);
  line-height: 1.12;
  letter-spacing: .01em;
  color: var(--white);
}

.page-about .about-h2--dark {
  color: var(--brown);
}

.page-about .about-h2--small {
  font-size: clamp(22px, 3.4vw, 30px);
  margin-bottom: 4px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero__grid {
  display: grid;
  gap: 28px;
  margin-top: 20px;
}

.page-about .about-hero__rail {
  border-top: var(--about-rule);
  padding-top: 14px;
}

.page-about .about-hero__rail-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .about-hero__rail-list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 7px;
}

.page-about .about-hero__rail-list li {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 10px;
  align-items: baseline;
  padding-bottom: 6px;
  border-bottom: var(--about-rule-soft);
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .about-hero__rail-list .mono {
  color: var(--white);
  font-size: 12px;
}

.page-about .about-hero__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(34px, 7.2vw, 68px);
  line-height: 1.02;
  letter-spacing: .005em;
  color: var(--white);
}

.page-about .about-hero__main .lede {
  max-width: 60ch;
  margin: 0;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--hair-soft);
  border: var(--about-rule-soft);
}

.page-about .about-hero__stats li {
  display: grid;
  gap: 5px;
  padding: 15px 16px;
  background: var(--ink-900);
}

.page-about .about-hero__stat-num {
  font-size: 24px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-hero__stat-label {
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 图片通用 ---------- */
.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--about-rule);
  background: var(--ink-800);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
  max-width: 68ch;
}

.page-about .about-strip {
  padding-block: clamp(20px, 4vw, 34px);
}

.page-about .about-strip .about-figure--wide img {
  aspect-ratio: 2 / 1;
}

/* ---------- 起点 ---------- */
.page-about .about-start__grid {
  display: grid;
  gap: 24px;
}

.page-about .about-start__text p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
  max-width: 60ch;
}

.page-about .about-notes {
  padding: 18px 18px 20px;
  border: var(--about-rule-soft);
  background: var(--ink-800);
}

.page-about .about-notes__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--orange);
}

.page-about .about-notes__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-notes__list li {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 10px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .about-notes__list .mono {
  color: var(--cyan);
  font-size: 12px;
  padding-top: 3px;
}

/* ---------- 时间轴 ---------- */
.page-about .about-road__lede {
  max-width: 62ch;
  margin: 0 0 30px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-stages {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-stage {
  position: relative;
  margin-left: 9px;
  padding: 0 0 34px 22px;
  border-left: var(--about-rule);
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 5px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--about-dot);
}

.page-about .about-stage:nth-child(even)::before {
  border-color: var(--orange);
}

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

.page-about .about-stage__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 8px;
}

.page-about .about-stage__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .about-stage:nth-child(even) .about-stage__kicker {
  color: var(--orange);
}

.page-about .about-stage__ver {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--white);
  padding: 3px 10px;
  border: var(--about-rule);
  border-radius: 999px;
  background: var(--ink-800);
}

.page-about .about-stage__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(20px, 3.4vw, 28px);
  line-height: 1.2;
  color: var(--white);
}

.page-about .about-stage__text {
  margin: 0 0 14px;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-stage__facts {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
  display: grid;
  gap: 7px;
}

.page-about .about-stage__facts li {
  display: grid;
  grid-template-columns: 62px 1fr;
  gap: 12px;
  padding-top: 7px;
  border-top: var(--about-rule-soft);
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-stage__facts .mono {
  color: var(--white);
  text-align: right;
}

.page-about .about-stage__more {
  border-top: var(--about-rule-soft);
  padding-top: 9px;
}

.page-about .about-stage__more summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--cyan);
}

.page-about .about-stage__more summary:hover {
  color: var(--white);
}

.page-about .about-stage__more summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .about-stage__more p {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 奶油带：团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 26px;
  margin-bottom: 28px;
}

.page-about .about-team__text p {
  margin: 0 0 14px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(26, 18, 8, .78);
}

.page-about .about-team .about-figure img {
  border-color: var(--hair-dark);
  background: rgba(26, 18, 8, .06);
}

.page-about .about-team .about-figure figcaption {
  color: rgba(26, 18, 8, .62);
}

.page-about .about-roles__wrap {
  border-top: var(--about-rule-dark);
  padding-top: 4px;
}

.page-about .about-roles {
  width: 100%;
  min-width: 420px;
  border-collapse: collapse;
}

.page-about .about-roles th,
.page-about .about-roles td {
  text-align: left;
  padding: 12px 12px 12px 0;
  border-bottom: var(--about-rule-dark);
  font-size: 14px;
  line-height: 1.6;
  color: rgba(26, 18, 8, .82);
  vertical-align: top;
}

.page-about .about-roles thead th {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: rgba(26, 18, 8, .55);
}

.page-about .about-roles tbody th {
  font-weight: 600;
  white-space: nowrap;
}

.page-about .about-roles td.mono {
  font-family: var(--font-mono);
  text-align: right;
  color: var(--brown);
  width: 64px;
}

.page-about .about-roles tbody tr:hover {
  background: rgba(26, 18, 8, .05);
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-coverage__grid {
  display: grid;
  gap: 26px;
}

.page-about .about-coverage__text p {
  margin: 0 0 14px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-facts {
  margin: 22px 0 0;
  padding: 16px 0 0;
  border-top: var(--about-rule);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px 16px;
}

.page-about .about-facts dt {
  font-size: 14px;
  color: var(--mist);
}

.page-about .about-facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--cyan);
  text-align: right;
}

.page-about .about-chart-figure {
  margin: 34px 0 0;
  border-top: var(--about-rule);
  padding-top: 18px;
}

.page-about .about-chart-wrap {
  overflow-x: auto;
}

.page-about .about-chart {
  display: block;
  width: 100%;
  min-width: 460px;
  height: auto;
}

.page-about .about-chart__base {
  stroke: var(--hair-soft);
  stroke-width: 1;
}

.page-about .about-chart__line {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 2;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.page-about .about-chart__dot {
  fill: var(--ink-900);
  stroke: var(--cyan);
  stroke-width: 2;
}

.page-about .about-chart__value {
  fill: var(--white);
  font-family: var(--font-mono);
  font-size: 12px;
}

.page-about .about-chart__label {
  fill: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
}

.page-about .about-chart-figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 下一步 ---------- */
.page-about .about-next__list {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
}

.page-about .about-next__list li {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 14px;
  padding: 18px 0;
  border-top: var(--about-rule-soft);
}

.page-about .about-next__list .mono {
  font-size: 13px;
  color: var(--orange);
  padding-top: 3px;
}

.page-about .about-next__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: clamp(19px, 3vw, 24px);
  line-height: 1.25;
  color: var(--white);
}

.page-about .about-next__list p {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 内链索引 ---------- */
.page-about .about-links__list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-links__list a {
  display: block;
  padding: 14px 16px;
  border: var(--about-rule);
  color: var(--white);
  font-size: 15px;
  line-height: 1.6;
  text-decoration: none;
  transition: background var(--ease), border-color var(--ease);
}

.page-about .about-links__list a:hover,
.page-about .about-links__list a:focus-visible {
  background: var(--ink-800);
  border-color: var(--cyan);
}

.page-about .about-links__list a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 悬停高亮同组指标 ---------- */
.page-about .about-hero__stats li:hover .about-hero__stat-num,
.page-about .about-facts dd:hover {
  color: var(--orange);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-links__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 260px) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-start__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 380px);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 400px);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-coverage__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 420px);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-stage {
    padding-left: 30px;
    padding-bottom: 42px;
  }

  .page-about .about-stage__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px 28px;
  }

  .page-about .about-stage__facts li {
    grid-template-columns: 56px 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-links__list a {
    transition: none;
  }
}