.page-about {
  --about-track: linear-gradient(180deg, #16665A 0%, #2C9C86 60%, #E4762B 100%);
  --about-gap: 24px;
  background: var(--c-mist);
  color: var(--c-ink);
  font-family: var(--font-sans);
  padding-bottom: 72px;
}

.page-about a {
  color: var(--c-green);
}

/* ── 面包屑 ───────────────────────────── */
.page-about .about-crumb {
  padding-top: 24px;
}

.page-about .about-crumb ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--c-ink-2);
}

.page-about .about-crumb li + li::before {
  content: "›";
  margin-right: 6px;
  color: var(--c-stone);
}

.page-about .about-crumb a {
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  border-bottom-color: var(--c-orange);
}

/* ── 首屏 ─────────────────────────────── */
.page-about .about-hero {
  padding-top: 28px;
  padding-bottom: 56px;
}

.page-about .about-hero__title {
  margin: 14px 0 22px;
  font-size: clamp(30px, 6.4vw, 58px);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: 0.02em;
  max-width: 20ch;
  color: var(--c-ink);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 60ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--c-ink-2);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 40px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stats__item {
  margin: 0;
  padding: 18px 18px 16px;
  background: var(--c-white);
  border: 2px solid var(--c-green);
  box-shadow: 5px 5px 0 var(--c-mint);
}

.page-about .about-stats__label {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-ink-2);
}

.page-about .about-stats__value {
  margin: 0;
  font-size: clamp(28px, 6vw, 42px);
  font-weight: 900;
  line-height: 1;
  color: var(--c-green);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.page-about .about-stats__item:nth-child(2) .about-stats__value,
.page-about .about-stats__item:nth-child(4) .about-stats__value {
  color: var(--c-orange-deep);
}

/* ── 编号章节骨架 ─────────────────────── */
.page-about .about-chapter {
  padding-top: 56px;
  padding-bottom: 56px;
  border-top: 1px solid var(--c-line);
}

.page-about .about-chapter--last {
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-chapter__num {
  display: block;
  font-size: clamp(64px, 15vw, 132px);
  font-weight: 900;
  line-height: 0.78;
  letter-spacing: -0.02em;
  color: var(--c-mint);
  -webkit-text-stroke: 2px var(--c-green-mid);
  user-select: none;
}

.page-about .about-chapter__title {
  margin: 0 0 14px;
  font-size: clamp(23px, 3.8vw, 36px);
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: 0.01em;
  color: var(--c-ink);
}

.page-about .about-chapter__lead {
  margin: 0 0 20px;
  font-size: 17px;
  line-height: 1.85;
  color: var(--c-ink-2);
  max-width: 60ch;
}

.page-about .about-subhead {
  margin: 40px 0 16px;
  font-size: 18px;
  font-weight: 900;
  letter-spacing: 0.03em;
  color: var(--c-green);
}

.page-about .about-note {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.7;
}

/* ── 交错图文 ─────────────────────────── */
.page-about .about-duo {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  margin-top: 8px;
}

/* ── 图片框 ───────────────────────────── */
.page-about .about-photo {
  margin: 0;
  background: var(--c-white);
  border: 2px solid var(--c-green);
  box-shadow: 8px 8px 0 var(--c-mint);
}

.page-about .about-photo img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(0.82) contrast(1.03);
}

.page-about .about-photo--wide img {
  aspect-ratio: 35 / 16;
}

.page-about .about-photo figcaption {
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-ink-2);
  border-top: 2px solid var(--c-mint);
}

/* ── 折叠块 ───────────────────────────── */
.page-about .about-fold {
  margin-top: 22px;
  background: var(--c-white);
  border: 2px solid var(--c-line);
}

.page-about .about-fold summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 700;
  color: var(--c-green);
  list-style: none;
}

.page-about .about-fold summary::-webkit-details-marker {
  display: none;
}

.page-about .about-fold summary::after {
  content: "+";
  margin-left: auto;
  font-size: 22px;
  line-height: 1;
  color: var(--c-orange);
}

.page-about .about-fold[open] summary::after {
  content: "–";
}

.page-about .about-fold summary:focus-visible {
  outline: 2px solid var(--c-orange);
  outline-offset: -2px;
}

.page-about .about-fold__body {
  padding: 4px 18px 18px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-ink-2);
}

.page-about .about-fold__body p {
  margin: 0 0 10px;
}

.page-about .about-fold__body strong {
  color: var(--c-ink);
}

/* ── 时间线 ───────────────────────────── */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 4px 0 0;
  padding: 0 0 0 34px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 6px;
  bottom: 6px;
  width: 3px;
  background: var(--about-track);
  border-radius: 2px;
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 26px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--c-white);
  border: 3px solid var(--c-green);
}

.page-about .about-timeline__item:first-child::before {
  border-color: var(--c-orange);
  background: var(--c-orange);
}

.page-about .about-timeline__year {
  display: block;
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--c-orange-deep);
  font-variant-numeric: tabular-nums;
}

.page-about .about-timeline__title {
  margin: 6px 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--c-green);
}

.page-about .about-timeline__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-ink-2);
}

/* ── 城市点阵 ─────────────────────────── */
.page-about .about-cities {
  list-style: none;
  margin: 0;
  padding: 20px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
  background: var(--c-mint);
  border: 2px solid var(--c-green);
  box-shadow: 6px 6px 0 var(--c-white);
}

.page-about .about-cities__item {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 15px;
}

.page-about .about-cities__dot {
  flex: none;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--c-green-mid);
}

.page-about .about-cities__dot--deep {
  background: var(--c-green);
}

.page-about .about-cities__dot--mid {
  background: var(--c-green-mid);
}

.page-about .about-cities__dot--light {
  background: var(--c-stone);
}

.page-about .about-cities__name {
  font-weight: 700;
  color: var(--c-ink);
}

.page-about .about-cities__year {
  margin-left: auto;
  font-size: 13px;
  color: var(--c-ink-2);
  font-variant-numeric: tabular-nums;
}

/* ── 评价中心数据板 ───────────────────── */
.page-about .about-review-board {
  margin-top: 24px;
  padding: 24px 20px;
  background: var(--c-white);
  border: 2px solid var(--c-green);
  border-left: 10px solid var(--c-orange);
  box-shadow: 8px 8px 0 var(--c-mint);
}

.page-about .about-review-board__figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  padding-bottom: 20px;
  border-bottom: 1px dashed var(--c-line);
}

.page-about .about-figure__value {
  display: block;
  font-size: clamp(30px, 7vw, 48px);
  font-weight: 900;
  line-height: 1;
  color: var(--c-green);
  font-variant-numeric: tabular-nums;
}

.page-about .about-figure--accent .about-figure__value {
  color: var(--c-orange);
}

.page-about .about-figure__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-ink-2);
}

.page-about .about-dims {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-dims__item {
  display: grid;
  grid-template-columns: 5.4em 1fr;
  grid-template-areas:
    "name bar"
    "hint hint";
  align-items: center;
  gap: 8px 12px;
}

.page-about .about-dims__name {
  grid-area: name;
  font-size: 15px;
  font-weight: 700;
  color: var(--c-ink);
}

.page-about .about-dims__bar {
  grid-area: bar;
  display: block;
  height: 10px;
  background: var(--c-mint);
  border: 1px solid var(--c-line);
  overflow: hidden;
}

.page-about .about-dims__bar i {
  display: block;
  height: 100%;
  width: 96%;
  background: var(--c-orange);
}

.page-about .about-dims__hint {
  grid-area: hint;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-ink-2);
}

.page-about .about-dims__foot {
  margin: 20px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--c-line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-ink-2);
}

/* ── 认证四道关 ───────────────────────── */
.page-about .about-gates {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-gates__item {
  padding: 18px 18px 16px;
  background: var(--c-white);
  border: 2px solid var(--c-green);
  border-left-width: 8px;
}

.page-about .about-gates__item--repeat {
  background: var(--c-orange-soft);
  border-color: var(--c-orange);
}

.page-about .about-gates__idx {
  display: block;
  font-size: 20px;
  font-weight: 900;
  letter-spacing: 0.04em;
  color: var(--c-orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-gates__title {
  margin: 6px 0 8px;
  font-size: 17px;
  font-weight: 900;
  color: var(--c-ink);
}

.page-about .about-gates__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-ink-2);
}

/* ── 合作伙伴 ─────────────────────────── */
.page-about .about-partners {
  display: grid;
  gap: 16px;
  margin-top: 8px;
}

.page-about .about-partner {
  padding: 20px;
  background: var(--c-white);
  border: 2px solid var(--c-line);
  box-shadow: 5px 5px 0 var(--c-mint);
}

.page-about .about-partner__title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 900;
  color: var(--c-green);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-ink-2);
}

.page-about .about-panel {
  margin-top: 20px;
  padding: 18px 20px;
  background: var(--c-mint);
  border-left: 6px solid var(--c-green-mid);
}

.page-about .about-panel p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-ink-2);
}

/* ── 四条原则 ─────────────────────────── */
.page-about .about-rules {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-rules__item {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 16px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--c-line);
}

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

.page-about .about-rules__no {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  font-size: 18px;
  font-weight: 900;
  color: var(--c-white);
  background: var(--c-green);
}

.page-about .about-rules__title {
  margin: 2px 0 8px;
  font-size: 17px;
  font-weight: 900;
  color: var(--c-ink);
}

.page-about .about-rules__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-ink-2);
}

/* ── 三个去处 ─────────────────────────── */
.page-about .about-next {
  display: grid;
  gap: 16px;
  margin-top: 8px;
}

.page-about .about-next__card {
  display: block;
  padding: 22px 20px;
  text-decoration: none;
  background: var(--c-white);
  border: 2px solid var(--c-green);
  box-shadow: 6px 6px 0 var(--c-mint);
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  transform: translate(-3px, -3px);
  box-shadow: 9px 9px 0 var(--c-orange);
}

.page-about .about-next__card:focus-visible {
  outline: 2px solid var(--c-orange);
  outline-offset: 3px;
}

.page-about .about-next__tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-orange-deep);
  background: var(--c-orange-soft);
  border: 1px solid var(--c-orange);
}

.page-about .about-next__title {
  margin: 12px 0 8px;
  font-size: 20px;
  font-weight: 900;
  color: var(--c-ink);
}

.page-about .about-next__card p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-ink-2);
}

.page-about .about-next__more {
  font-size: 14px;
  font-weight: 700;
  color: var(--c-orange-deep);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin: 30px 0 0;
  font-size: 14px;
}

/* ── 桌面增强 ─────────────────────────── */
@media (min-width: 720px) {
  .page-about {
    --about-gap: 32px;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-cities {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    padding: 26px 28px;
  }

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

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

  .page-about .about-dims__item {
    grid-template-columns: 6em 1fr;
    grid-template-areas:
      "name bar"
      "hint hint";
  }
}

@media (min-width: 960px) {
  .page-about .about-chapter {
    padding-top: 76px;
    padding-bottom: 76px;
  }

  .page-about .about-chapter__grid {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .about-duo {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: 40px;
  }

  .page-about .about-duo--flip > .about-photo {
    order: 2;
  }

  .page-about .about-review-board {
    padding: 30px 32px;
  }

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

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

  .page-about .about-next__card:hover,
  .page-about .about-next__card:focus-visible {
    transform: none;
  }
}