.page-about {
  background: var(--sy-paper);
  color: var(--sy-ink);
  font-family: var(--sy-font-sans);
  overflow-x: hidden;
}

.page-about :focus-visible {
  outline: 3px solid var(--sy-clay);
  outline-offset: 3px;
}

.page-about .about-shell {
  width: 100%;
  max-width: var(--sy-wrap);
  margin-inline: auto;
  padding-inline: var(--sy-gutter);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: 10px;
}

.page-about .about-cover {
  margin: clamp(14px, 2vw, 26px) 0 0;
  border-radius: var(--sy-radius-lg);
  overflow: hidden;
  background: linear-gradient(150deg, var(--sy-mist) 0%, var(--sy-green-100) 100%);
}

.page-about .about-cover img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

@media (min-width: 700px) {
  .page-about .about-cover img {
    aspect-ratio: 16 / 10;
  }
}

.page-about .about-hero__panel {
  position: relative;
  z-index: 1;
  margin-top: -46px;
  max-width: 740px;
  background: var(--sy-paper);
  padding: 22px clamp(18px, 3vw, 44px) 8px 0;
}

@media (min-width: 720px) {
  .page-about .about-hero__panel {
    margin-top: -88px;
    padding-top: 34px;
  }
}

.page-about .about-hero h1 {
  margin: 10px 0 0;
  font-family: var(--sy-font-serif);
  font-weight: 600;
  letter-spacing: 0.01em;
  font-size: clamp(30px, 4.6vw, 54px);
  line-height: 1.16;
  color: var(--sy-teal-900);
}

.page-about .about-hero .sy-lede {
  margin: 16px 0 0;
  max-width: 620px;
  font-size: clamp(16px, 1.9vw, 19px);
  line-height: 1.8;
  color: var(--sy-slate-500);
}

/* ---------- 主体分栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding-block: clamp(34px, 5vw, 58px) 0;
}

@media (min-width: 900px) {
  .page-about .about-body {
    grid-template-columns: 196px minmax(0, 1fr);
    column-gap: clamp(34px, 5vw, 84px);
  }
}

.page-about .about-index {
  padding-bottom: 6px;
}

@media (min-width: 900px) {
  .page-about .about-index {
    position: sticky;
    top: calc(var(--sy-header-h) + 30px);
    align-self: start;
    padding-bottom: 0;
  }
}

.page-about .about-index__label {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--sy-slate-500);
}

.page-about .about-index__list {
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0 0 12px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

@media (min-width: 900px) {
  .page-about .about-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 12px;
  border-left: 2px solid var(--sy-mist);
  font-size: 14px;
  line-height: 1.5;
  white-space: nowrap;
  text-decoration: none;
  color: var(--sy-slate-500);
  transition: color 0.2s var(--sy-ease), border-color 0.2s var(--sy-ease), background-color 0.2s var(--sy-ease);
}

.page-about .about-index__link:hover {
  color: var(--sy-teal-900);
  border-left-color: var(--sy-clay);
  background: var(--sy-green-100);
}

.page-about .about-index__num {
  font-family: var(--sy-font-serif);
  font-size: 13px;
  color: var(--sy-green);
  font-variant-numeric: tabular-nums;
}

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

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  position: relative;
  padding-block: clamp(44px, 6vw, 78px);
  border-top: 1px solid var(--sy-mist);
}

.page-about .about-section--first {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-section::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 8px solid var(--sy-green);
}

.page-about .about-section--first::before {
  display: none;
}

.page-about .about-section__head {
  max-width: 660px;
  margin-bottom: clamp(22px, 3vw, 36px);
}

.page-about .about-section h2 {
  margin: 8px 0 0;
  font-family: var(--sy-font-serif);
  font-weight: 600;
  font-size: clamp(24px, 3.2vw, 36px);
  line-height: 1.28;
  letter-spacing: 0.01em;
  color: var(--sy-teal-900);
}

.page-about .about-section__lede {
  margin: 12px 0 0;
  max-width: 560px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--sy-slate-500);
}

.page-about .about-prose {
  max-width: 646px;
}

.page-about .about-prose p {
  margin: 0 0 1.05em;
  font-size: 17px;
  line-height: 1.8;
  color: var(--sy-ink);
}

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

.page-about .sy-note {
  margin: 24px 0 0;
  padding: 2px 0 2px 16px;
  max-width: 540px;
  border-left: 2px solid var(--sy-clay-200);
  font-size: 15px;
  line-height: 1.7;
  color: var(--sy-slate-500);
}

/* ---------- 节点时间轴 ---------- */
.page-about .about-steps {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: clamp(16px, 2.4vw, 24px) 0;
  border-top: 1px dashed var(--sy-mist);
}

.page-about .about-step:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-step__mark {
  position: relative;
  display: block;
  width: 54px;
  height: 54px;
  background: var(--sy-green-100);
  border-radius: 18px 6px 18px 6px;
  transition: transform 0.28s var(--sy-ease);
}

.page-about .about-step__mark span {
  position: absolute;
  left: 9px;
  top: 3px;
  font-family: var(--sy-font-serif);
  font-weight: 600;
  font-size: 38px;
  line-height: 1;
  color: var(--sy-teal-700);
  font-variant-numeric: tabular-nums;
}

.page-about .about-step:hover .about-step__mark,
.page-about .about-step:focus .about-step__mark {
  transform: translateY(-3px);
}

.page-about .about-step__title {
  margin: 2px 0 0;
  font-family: var(--sy-font-serif);
  font-weight: 600;
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.42;
  color: var(--sy-teal-900);
}

.page-about .about-step__note {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 15px;
  line-height: 1.75;
  color: var(--sy-slate-500);
  transition: max-height 0.34s var(--sy-ease), opacity 0.28s var(--sy-ease), margin-top 0.34s var(--sy-ease);
}

.page-about .about-step:hover .about-step__note,
.page-about .about-step:focus .about-step__note,
.page-about .about-step:focus-within .about-step__note {
  max-height: 8em;
  opacity: 1;
  margin-top: 7px;
}

/* ---------- 三条规矩 ---------- */
.page-about .about-ways {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

@media (min-width: 840px) {
  .page-about .about-ways {
    grid-template-columns: 5fr 3fr 4fr;
    align-items: start;
  }
}

.page-about .about-way {
  padding: 22px 20px 20px;
  border-radius: var(--sy-radius);
  background: var(--sy-green-100);
  color: var(--sy-ink);
}

.page-about .about-way--difference {
  background: var(--sy-teal-900);
  color: var(--sy-paper);
}

.page-about .about-way--scene {
  background: var(--sy-card);
  border: 1px solid var(--sy-green);
}

.page-about .about-way__head {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "label cue"
    "title cue"
    "summary summary";
  gap: 3px 10px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-way__label {
  grid-area: label;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--sy-slate-500);
}

.page-about .about-way__title {
  grid-area: title;
  font-family: var(--sy-font-serif);
  font-weight: 600;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.42;
  color: var(--sy-teal-900);
}

.page-about .about-way__cue {
  grid-area: cue;
  align-self: center;
  font-family: var(--sy-font-serif);
  font-size: 22px;
  line-height: 1;
  color: var(--sy-clay);
  transition: transform 0.24s var(--sy-ease);
}

.page-about .about-way[open] .about-way__cue {
  transform: rotate(45deg);
}

.page-about .about-way__summary {
  grid-area: summary;
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--sy-slate-500);
}

.page-about .about-way--difference .about-way__label,
.page-about .about-way--difference .about-way__summary {
  color: var(--sy-mist);
}

.page-about .about-way--difference .about-way__title {
  color: var(--sy-paper);
}

.page-about .about-way__body {
  padding-top: 12px;
  border-top: 1px solid rgba(90, 107, 112, 0.22);
  margin-top: 12px;
}

.page-about .about-way__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
}

.page-about .about-way--difference .about-way__body {
  border-top-color: rgba(247, 244, 238, 0.28);
}

.page-about .about-way--difference .about-way__body p {
  color: var(--sy-mist);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 36px);
}

@media (min-width: 800px) {
  .page-about .about-team {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: start;
  }
}

.page-about .about-stats {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(20px, 3vw, 42px);
  margin: 26px 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--sy-mist);
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--sy-font-serif);
  font-weight: 600;
  font-size: clamp(32px, 4.6vw, 46px);
  line-height: 1;
  color: var(--sy-teal-900);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stats__label {
  display: block;
  margin-top: 7px;
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--sy-slate-500);
}

/* ---------- 云南 ---------- */
.page-about .about-yunnan {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 34px);
  align-items: start;
}

@media (min-width: 800px) {
  .page-about .about-yunnan {
    grid-template-columns: 1.2fr 0.8fr;
  }
}

.page-about .about-yunnan h2 {
  margin-bottom: 18px;
}

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--sy-radius-lg);
  object-fit: cover;
  background: linear-gradient(160deg, var(--sy-green-100), var(--sy-mist));
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: 0.02em;
  line-height: 1.6;
  color: var(--sy-slate-500);
}

/* ---------- 延伸入口 ---------- */
.page-about .about-forward {
  padding-block: clamp(44px, 6vw, 78px);
  border-top: 1px solid var(--sy-mist);
}

.page-about .about-forward__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 720px) {
  .page-about .about-forward__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-forward__link {
  display: block;
  height: 100%;
  padding: 20px 22px;
  border-radius: var(--sy-radius);
  background: var(--sy-green-100);
  text-decoration: none;
  transition: background-color 0.22s var(--sy-ease), transform 0.22s var(--sy-ease);
}

.page-about .about-forward__link:hover {
  background: var(--sy-mist);
  transform: translateY(-2px);
}

.page-about .about-forward__title {
  display: block;
  font-family: var(--sy-font-serif);
  font-weight: 600;
  font-size: 19px;
  line-height: 1.4;
  color: var(--sy-teal-900);
}

.page-about .about-forward__desc {
  display: block;
  margin-top: 7px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--sy-slate-500);
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  .page-about .about-step__note {
    max-height: none;
    opacity: 1;
    margin-top: 7px;
  }

  .page-about .about-forward__link:hover,
  .page-about .about-step:hover .about-step__mark {
    transform: none;
  }
}
<<<END>>>