.page-about {
  --about-index-w: 232px;
  --about-flow-gap: clamp(20px, 3vw, 40px);
  display: block;
  background: var(--mist);
  padding-bottom: clamp(40px, 7vw, 88px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  width: min(calc(100% - 2 * var(--gutter)), var(--shell-max));
  margin: clamp(14px, 3vw, 26px) auto 0;
  padding: clamp(26px, 4.5vw, 56px) clamp(20px, 4vw, 52px) clamp(30px, 5vw, 60px);
  border-radius: var(--radius-soft);
  background:
    radial-gradient(120% 150% at 108% -20%, rgba(47, 162, 119, 0.62), transparent 62%),
    linear-gradient(155deg, var(--green-deep) 0%, var(--green-mid) 54%, var(--green-turf) 100%);
  color: var(--white);
  overflow: hidden;
  box-shadow: var(--shadow-lift);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 46px;
  background-image: repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.2) 0 1px, transparent 1px 26px);
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -140px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  border: 1px solid rgba(255, 210, 74, 0.28);
  pointer-events: none;
}

.page-about .about-hero .breadcrumb {
  position: relative;
  z-index: 1;
  margin-bottom: 22px;
}

.page-about .about-hero .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 13px;
}

.page-about .about-hero .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: rgba(255, 255, 255, 0.42);
}

.page-about .about-hero .breadcrumb__link {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.28);
}

.page-about .about-hero .breadcrumb__link:hover {
  color: var(--yellow);
  border-bottom-color: var(--yellow);
}

.page-about .about-hero .breadcrumb__current {
  color: var(--yellow);
  font-weight: 600;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(30px, 5.6vw, 54px);
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(15.5px, 1.7vw, 18px);
  line-height: 1.82;
  color: rgba(255, 255, 255, 0.86);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  border-radius: var(--radius-panel);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.16);
}

.page-about .about-hero__stat {
  padding: 16px 14px 18px;
  background: rgba(11, 59, 46, 0.5);
}

.page-about .about-hero__stat .num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--yellow);
}

.page-about .about-hero__stat .label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.72);
}

/* ---------- 主体框架 ---------- */
.page-about .about-body {
  width: min(calc(100% - 2 * var(--gutter)), var(--shell-max));
  margin: clamp(28px, 5vw, 54px) auto 0;
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

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

/* ---------- 左侧章节索引 ---------- */
.page-about .about-index__caption {
  margin: 0 0 10px;
  color: var(--ink-soft);
}

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

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 10px 16px;
  border-radius: var(--radius-pill);
  background: var(--white);
  border: 1px solid rgba(34, 80, 63, 0.2);
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.22s ease, color 0.22s ease, border-color 0.22s ease;
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--ink-soft);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--red-card);
  color: var(--red-text);
  outline: none;
}

.page-about .about-index__link:hover .about-index__num,
.page-about .about-index__link:focus-visible .about-index__num {
  color: var(--red-text);
}

.page-about .about-body:has(#origin[data-active]) .about-index__link[href="#origin"],
.page-about .about-body:has(#sources[data-active]) .about-index__link[href="#sources"],
.page-about .about-body:has(#coverage[data-active]) .about-index__link[href="#coverage"],
.page-about .about-body:has(#stoppage[data-active]) .about-index__link[href="#stoppage"],
.page-about .about-body:has(#team[data-active]) .about-index__link[href="#team"],
.page-about .about-body:has(#stages[data-active]) .about-index__link[href="#stages"],
.page-about .about-body:has(#served[data-active]) .about-index__link[href="#served"] {
  background: var(--red-card);
  border-color: var(--red-card);
  color: var(--white);
}

.page-about .about-body:has(#origin[data-active]) .about-index__link[href="#origin"] .about-index__num,
.page-about .about-body:has(#sources[data-active]) .about-index__link[href="#sources"] .about-index__num,
.page-about .about-body:has(#coverage[data-active]) .about-index__link[href="#coverage"] .about-index__num,
.page-about .about-body:has(#stoppage[data-active]) .about-index__link[href="#stoppage"] .about-index__num,
.page-about .about-body:has(#team[data-active]) .about-index__link[href="#team"] .about-index__num,
.page-about .about-body:has(#stages[data-active]) .about-index__link[href="#stages"] .about-index__num,
.page-about .about-body:has(#served[data-active]) .about-index__link[href="#served"] .about-index__num {
  color: rgba(255, 255, 255, 0.78);
}

/* ---------- 章节面板 ---------- */
.page-about .about-chapter {
  position: relative;
  background: var(--white);
  border: 1px solid rgba(34, 80, 63, 0.1);
  border-radius: var(--radius-panel);
  box-shadow: var(--shadow-panel);
  padding: clamp(24px, 4vw, 44px);
  margin-bottom: 26px;
  scroll-margin-top: calc(var(--header-min) + 20px);
}

.page-about .about-chapter + .about-chapter {
  margin-top: -14px;
}

.page-about .about-chapter--flush {
  background: transparent;
  border: 0;
  box-shadow: none;
  padding: 0;
}

.page-about .about-chapter__head {
  position: relative;
  padding-top: 20px;
}

.page-about .about-chapter__head::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 68px;
  height: 4px;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--red-card), var(--orange-warm));
}

.page-about .about-chapter__head--dark::before {
  background: linear-gradient(90deg, var(--yellow), var(--orange-warm));
}

.page-about .about-chapter__no {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--red-text);
}

.page-about .about-chapter__title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(22px, 3.2vw, 31px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-chapter__desc {
  margin: 0 0 24px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-soft);
}

/* ---------- 正文 ---------- */
.page-about .about-prose p {
  margin: 0 0 1em;
  font-size: 16.5px;
  line-height: 1.86;
  color: var(--ink);
}

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

.page-about .about-prose a {
  color: var(--red-text);
  text-decoration: none;
  border-bottom: 1px solid rgba(196, 63, 27, 0.4);
}

.page-about .about-prose a:hover {
  border-bottom-color: var(--red-text);
}

.page-about .about-prose--dark p {
  color: rgba(255, 255, 255, 0.88);
}

.page-about .about-prose--dark a {
  color: var(--yellow);
  border-bottom-color: rgba(255, 210, 74, 0.45);
}

.page-about .about-callout {
  margin: 26px 0 0;
  padding: 18px 22px;
  border-radius: 18px;
  background: var(--mist);
  border-left: 4px solid var(--green-bright);
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  position: relative;
  margin: 0 0 28px;
  border-radius: var(--radius-panel);
  overflow: hidden;
  background: var(--green-deep);
}

.page-about .about-figure--side {
  margin: 26px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-figure__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 34px 20px 16px;
  background: linear-gradient(180deg, rgba(11, 59, 46, 0), rgba(11, 59, 46, 0.88));
  color: rgba(255, 255, 255, 0.9);
  font-size: 13.5px;
  line-height: 1.6;
}

/* ---------- 四步流程 ---------- */
.page-about .about-steps {
  display: grid;
  gap: 14px;
  margin-top: 4px;
}

.page-about .about-step {
  position: relative;
  padding: 20px 22px 22px;
  border-radius: 20px;
  background: var(--mist);
  border: 1px solid rgba(34, 80, 63, 0.14);
  border-top-right-radius: 34px;
}

.page-about .about-step__no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  margin-bottom: 12px;
  border-radius: var(--radius-pill);
  background: var(--green-deep);
  color: var(--yellow);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
}

.page-about .about-step__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-step__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-soft);
}

/* ---------- 覆盖地图 ---------- */
.page-about .about-map-grid {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
}

.page-about .about-map {
  padding: clamp(18px, 3vw, 28px);
  border-radius: var(--radius-panel);
  background:
    radial-gradient(90% 120% at 0% 0%, rgba(47, 162, 119, 0.5), transparent 60%),
    linear-gradient(165deg, var(--green-deep), var(--green-mid) 72%, var(--green-turf));
  color: var(--white);
  box-shadow: var(--shadow-lift);
}

.page-about .about-map__title {
  margin: 0 0 4px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 800;
}

.page-about .about-map__sub {
  margin: 0 0 12px;
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: rgba(255, 255, 255, 0.66);
}

.page-about .about-map__svg {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.page-about .about-map__outline {
  fill: rgba(47, 162, 119, 0.16);
  stroke: rgba(255, 255, 255, 0.3);
  stroke-width: 1.6;
  stroke-linejoin: round;
}

.page-about .about-map__pin {
  fill: var(--yellow);
  stroke: rgba(11, 59, 46, 0.5);
  stroke-width: 1;
  transition: fill 0.2s ease;
}

.page-about .about-map__pin--core {
  fill: var(--orange-warm);
}

.page-about .about-map__pin:hover {
  fill: var(--red-card);
}

.page-about .about-map__legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin-top: 14px;
  font-size: 12.5px;
  color: rgba(255, 255, 255, 0.78);
}

.page-about .about-map__legend-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-map__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--yellow);
}

.page-about .about-map__dot--core {
  background: var(--orange-warm);
}

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

/* ---------- 补时专题 ---------- */
.page-about .about-stoppage {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(24px, 4vw, 46px);
  border-radius: var(--radius-soft);
  background: var(--green-deep);
  color: var(--white);
  box-shadow: var(--shadow-lift);
}

.page-about .about-stoppage__bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  opacity: 0.42;
}

.page-about .about-stoppage__bg img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-stoppage::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(148deg, rgba(11, 59, 46, 0.95) 18%, rgba(11, 59, 46, 0.76) 62%, rgba(228, 84, 43, 0.44));
}

.page-about .about-stoppage__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stoppage__tags li {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 12px 18px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.18);
  font-size: 14px;
  color: rgba(255, 255, 255, 0.9);
}

.page-about .about-stoppage__tags .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 19px;
  font-weight: 700;
  color: var(--yellow);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 14px;
  margin-bottom: 28px;
}

.page-about .about-team__figure {
  padding: 22px 24px 24px;
  border-radius: var(--radius-panel);
}

.page-about .about-team__figure .num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(38px, 6vw, 58px);
  font-weight: 700;
  line-height: 1;
}

.page-about .about-team__figure .label {
  display: block;
  margin-top: 10px;
  letter-spacing: 0.06em;
}

.page-about .about-team__figure--deep {
  background: linear-gradient(140deg, var(--green-deep), var(--green-mid));
  color: var(--white);
}

.page-about .about-team__figure--deep .num {
  color: var(--yellow);
}

.page-about .about-team__figure--deep .label {
  color: rgba(255, 255, 255, 0.76);
}

.page-about .about-team__figure--card {
  background: var(--white);
  border: 1px solid rgba(34, 80, 63, 0.16);
  border-left: 5px solid var(--red-card);
}

.page-about .about-team__figure--card .num {
  color: var(--red-text);
}

.page-about .about-team__figure--card .label {
  color: var(--ink-soft);
}

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

.page-about .about-role {
  padding: 18px 20px;
  border-radius: 18px;
  background: var(--mist);
  border-left: 3px solid var(--green-bright);
}

.page-about .about-role__name {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-role__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-soft);
}

/* ---------- 成长阶段 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: 16px;
}

.page-about .about-stage {
  position: relative;
  overflow: hidden;
  border-radius: 20px;
  background: var(--white);
  border: 1px solid rgba(34, 80, 63, 0.16);
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  top: 0;
  left: 24px;
  right: 24px;
  height: 3px;
  border-radius: var(--radius-pill);
  background: repeating-linear-gradient(90deg, var(--orange-warm) 0 16px, transparent 16px 30px);
  opacity: 0.85;
}

.page-about .about-stage[open] {
  background: linear-gradient(180deg, rgba(47, 162, 119, 0.08), transparent 42%), var(--white);
}

.page-about .about-stage__summary {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  padding: 22px 22px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-stage__summary::after {
  content: "展开";
  margin-left: auto;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--red-text);
}

.page-about .about-stage[open] .about-stage__summary::after {
  content: "收起";
  color: var(--ink-soft);
}

.page-about .about-stage__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

.page-about .about-stage__name {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-stage__body {
  padding: 0 22px 22px;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--ink);
}

.page-about .about-stage__body p {
  margin: 0;
}

/* ---------- 服务对象 ---------- */
.page-about .about-audience {
  display: grid;
  gap: 16px;
}

.page-about .about-audience__card {
  padding: 22px 24px 24px;
  border-radius: 20px;
  background: var(--mist);
  border-top-left-radius: 40px;
  border-left: 4px solid var(--green-deep);
}

.page-about .about-audience__name {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-audience__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--ink);
}

/* ---------- 结尾动作 ---------- */
.page-about .about-cta {
  margin-top: 30px;
  padding: clamp(22px, 3.5vw, 34px);
  border-radius: var(--radius-panel);
  background: linear-gradient(135deg, var(--green-deep), var(--green-mid) 65%, var(--green-turf));
  color: var(--white);
}

.page-about .about-cta__text {
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 800;
  line-height: 1.5;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.page-about .about-cta .btn--ghost {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.42);
  color: var(--white);
}

.page-about .about-cta .btn--ghost:hover {
  border-color: var(--yellow);
  color: var(--yellow);
}

.page-about .about-cta__link {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.82);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.35);
  padding-bottom: 2px;
}

.page-about .about-cta__link:hover {
  color: var(--yellow);
  border-bottom-color: var(--yellow);
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 22px;
  }

  .page-about .about-steps > .about-step:nth-child(even) {
    margin-top: 28px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: stretch;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-audience {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.75fr);
    align-items: end;
  }

  .page-about .about-map-grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: start;
  }

  .page-about .about-timeline {
    position: relative;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-timeline::before {
    content: "";
    position: absolute;
    top: 27px;
    left: 6%;
    right: 6%;
    height: 2px;
    background: repeating-linear-gradient(90deg, rgba(34, 80, 63, 0.5) 0 9px, transparent 9px 18px);
    pointer-events: none;
  }

  .page-about .about-stage__summary {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    min-height: 108px;
    padding-top: 26px;
  }

  .page-about .about-stage__summary::after {
    margin-left: 0;
    margin-top: 4px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    align-items: start;
    gap: var(--about-flow-gap);
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-min) + 28px);
    align-self: start;
  }

  .page-about .about-index__caption {
    padding-left: 4px;
  }

  .page-about .about-index__list {
    flex-direction: column;
    overflow: visible;
    gap: 7px;
    padding-bottom: 0;
  }

  .page-about .about-index__link {
    width: 100%;
    justify-content: flex-start;
  }

  .page-about .about-chapter + .about-chapter {
    margin-top: -18px;
  }

  .page-about .about-chapter:nth-child(odd) {
    margin-right: 20px;
  }

  .page-about .about-chapter:nth-child(even) {
    margin-left: 20px;
  }
}

@media (min-width: 1200px) {
  .page-about {
    --about-index-w: 252px;
  }

  .page-about .about-prose p {
    font-size: 17px;
  }
}

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