.page-about {
  background: var(--c-cream);
  color: var(--c-ink);
  font-family: var(--font-ui);
}

/* ---------- 顶部条 ---------- */
.page-about .about-topline {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 16px;
  padding-top: 20px;
  padding-bottom: 14px;
  border-bottom: var(--line);
}
.page-about .about-topline__meta {
  margin: 0;
  color: var(--c-muted);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 0 0 34px;
}
.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding-top: 26px;
}
.page-about .about-kicker {
  margin: 0 0 14px;
  color: var(--c-terracotta);
}
.page-about .about-hero__title {
  margin: 0 0 18px;
  font-size: clamp(2.4rem, 9vw, 4.6rem);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--c-ink);
}
.page-about .about-hero__title::after {
  content: "";
  display: block;
  width: 68px;
  height: 6px;
  margin-top: 20px;
  background: var(--c-orange);
}
.page-about .about-hero__lede {
  margin: 0;
  max-width: 34em;
  color: var(--c-muted);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 28px 0 0;
  padding: 0;
  background: var(--c-silver);
  border: var(--line);
}
.page-about .about-figures__cell {
  background: var(--c-cream);
  padding: 14px 12px 12px;
}
.page-about .about-figures__cell dt {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-muted);
  margin-bottom: 6px;
}
.page-about .about-figures__cell dd {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--c-ink);
}

.page-about .about-hero__art {
  position: relative;
  min-height: 260px;
  border-radius: var(--radius-m);
  overflow: hidden;
  background: linear-gradient(158deg, var(--c-deep) 0%, #1b333d 52%, var(--c-terracotta-deep) 100%);
}
.page-about .about-hero__svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.page-about .about-hero__ridge {
  stroke: none;
}
.page-about .about-hero__ridge--back { fill: rgba(138, 167, 156, 0.24); }
.page-about .about-hero__ridge--mid { fill: rgba(138, 167, 156, 0.34); }
.page-about .about-hero__ridge--front { fill: rgba(34, 63, 77, 0.92); }
.page-about .about-hero__lamp { fill: var(--c-orange); }
.page-about .about-hero__lamp-glow {
  fill: var(--c-amber);
  opacity: 0.28;
}
.page-about .about-hero__artlabel {
  position: absolute;
  left: 20px;
  bottom: 18px;
  margin: 0;
  color: var(--c-cream);
  letter-spacing: 0.16em;
  font-size: 11.5px;
  opacity: 0.86;
}

/* ---------- 主体骨架：左侧年份轨道 ---------- */
.page-about .about-shell {
  display: block;
  padding-bottom: 56px;
}
.page-about .about-rail {
  display: none;
}
.page-about .about-flow {
  min-width: 0;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: 34px 0 38px;
  border-top: var(--line);
}
.page-about .about-section:first-child {
  border-top: none;
  padding-top: 8px;
}

/* ---------- 起点故事 ---------- */
.page-about .about-origin {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 22px;
}
.page-about .about-origin__text p {
  margin: 0 0 16px;
}
.page-about .about-origin__text p:last-child {
  margin-bottom: 0;
}
.page-about .about-media {
  background: linear-gradient(150deg, var(--c-mist) 0%, var(--c-deep) 100%);
}
.page-about .about-media__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 品牌主张 ---------- */
.page-about .about-claims__lede {
  margin: 18px 0 24px;
  max-width: 38em;
}
.page-about .about-claims {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}
.page-about .about-claims__item {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 14px;
  padding: 22px 0;
  border-top: var(--line);
}
.page-about .about-claims__item:first-child {
  border-top: 2px solid var(--c-ink);
}
.page-about .about-claims__num {
  margin: 2px 0 0;
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-orange);
}
.page-about .about-claims__title {
  margin: 0 0 8px;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.35;
}
.page-about .about-claims__text {
  margin: 0;
  color: var(--c-muted);
  font-size: 15.5px;
  line-height: 1.85;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}
.page-about .about-timeline__item {
  scroll-margin-top: 110px;
  margin-bottom: 12px;
}
.page-about .about-stage {
  background: var(--c-paper);
  border: var(--line);
  border-left: 3px solid var(--c-terracotta);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}
.page-about .about-stage__summary {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 14px;
  padding: 16px 40px 16px 18px;
  cursor: pointer;
  position: relative;
  list-style: none;
}
.page-about .about-stage__summary::-webkit-details-marker {
  display: none;
}
.page-about .about-stage__year {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--c-terracotta-deep);
}
.page-about .about-stage__label {
  font-size: 15px;
  font-weight: 700;
  color: var(--c-ink);
}
.page-about .about-stage__marker {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  text-align: center;
  color: var(--c-orange);
  font-size: 18px;
  line-height: 1;
}
.page-about .about-stage__marker::before {
  content: "+";
}
.page-about .about-stage[open] .about-stage__marker::before {
  content: "–";
}
.page-about .about-stage__body {
  padding: 0 18px 20px;
  border-top: 1px dashed var(--c-silver);
  margin-top: 2px;
  padding-top: 14px;
}
.page-about .about-stage__body p {
  margin: 0;
  color: var(--c-muted);
  font-size: 15.5px;
  line-height: 1.85;
}
.page-about .about-stage[open] {
  background: var(--c-paper);
  box-shadow: 8px 8px 0 rgba(180, 82, 58, 0.14);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 22px;
}
.page-about .about-team__intro .prose {
  margin: 0 0 22px;
}
.page-about .about-team__stack {
  display: grid;
  gap: 10px;
}
.page-about .about-team__card {
  background: var(--c-paper);
  border: var(--line);
  border-left: 4px solid var(--c-mist);
  padding: 18px 18px 18px 20px;
  box-shadow: 7px 7px 0 rgba(138, 167, 156, 0.2);
  transition: transform 0.28s ease, box-shadow 0.28s ease;
  outline-offset: 3px;
}
.page-about .about-team__card--clay {
  border-left-color: var(--c-terracotta);
  box-shadow: 7px 7px 0 rgba(180, 82, 58, 0.18);
}
.page-about .about-team__card--amber {
  border-left-color: var(--c-amber);
  box-shadow: 7px 7px 0 rgba(217, 162, 74, 0.22);
}
.page-about .about-team__card:hover,
.page-about .about-team__card:focus-within,
.page-about .about-team__card:focus {
  transform: translate(-2px, -4px);
  box-shadow: 12px 12px 0 rgba(34, 28, 21, 0.12);
}
.page-about .about-team__role {
  margin: 0 0 8px;
  color: var(--c-muted);
}
.page-about .about-team__name {
  margin: 0 0 8px;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.4;
}
.page-about .about-team__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-muted);
}
.page-about .about-team__duties {
  list-style: none;
  margin: 10px 0 0;
  padding: 10px 0 0;
  border-top: 1px dashed var(--c-silver);
}
.page-about .about-team__duties li {
  position: relative;
  padding-left: 14px;
  margin-bottom: 6px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--c-ink);
}
.page-about .about-team__duties li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 2px;
  background: var(--c-orange);
}
.page-about .about-team__linkline {
  margin: 10px 0 0;
  font-size: 13.5px;
  color: var(--c-muted);
}
.page-about .about-team__linkline a {
  color: var(--c-terracotta-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 地区对照 ---------- */
.page-about .about-regions {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-top: 22px;
}
.page-about .about-regions__text p {
  margin: 0 0 16px;
}
.page-about .about-regions__text p:last-child {
  margin-bottom: 0;
}
.page-about .about-regions__note {
  background: var(--c-paper);
}
.page-about .about-regions__note-title {
  margin: 0 0 8px;
  font-weight: 700;
  color: var(--c-terracotta-deep);
  font-size: 14.5px;
}
.page-about .about-regions__note p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--c-muted);
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-coverage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 22px;
}
.page-about .about-coverage__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-coverage__list li {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: var(--line);
}
.page-about .about-coverage__list li:first-child {
  border-top: 2px solid var(--c-ink);
}
.page-about .about-coverage__num {
  font-size: 20px;
  font-weight: 700;
  color: var(--c-orange);
  letter-spacing: 0.01em;
}
.page-about .about-coverage__label {
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-ink);
}
.page-about .about-coverage__art {
  position: relative;
}
.page-about .about-terrain {
  display: block;
  width: 100%;
  height: auto;
}
.page-about .about-terrain path {
  fill: none;
  stroke: var(--c-mist);
  stroke-width: 1.2;
}
.page-about .about-terrain__dots circle {
  fill: var(--c-orange);
  stroke: none;
}
.page-about .about-coverage__caption {
  margin: 8px 0 0;
  color: var(--c-muted);
}
.page-about .about-coverage__figure {
  margin-top: 30px;
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  border-top: 2px solid var(--c-ink);
}
.page-about .about-cta__title {
  margin: 0 0 12px;
  font-size: clamp(1.5rem, 5vw, 2.1rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.01em;
}
.page-about .about-cta__text {
  margin: 0 0 20px;
  max-width: 38em;
  color: var(--c-muted);
  font-size: 15.5px;
  line-height: 1.85;
}
.page-about .about-cta__actions {
  margin-bottom: 14px;
}
.page-about .about-cta__links {
  margin: 0;
  font-size: 14px;
  color: var(--c-muted);
}
.page-about .about-cta__links a {
  color: var(--c-terracotta-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 悬停展开职责 ---------- */
@media (hover: hover) and (pointer: fine) {
  .page-about .about-team__duties {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
    transition: max-height 0.32s ease, opacity 0.28s ease, margin-top 0.28s ease, padding-top 0.28s ease;
  }
  .page-about .about-team__card:hover .about-team__duties,
  .page-about .about-team__card:focus-within .about-team__duties,
  .page-about .about-team__card:focus .about-team__duties {
    max-height: 300px;
    opacity: 1;
    margin-top: 10px;
    padding-top: 10px;
    border-top-color: var(--c-silver);
  }
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-origin {
    grid-template-columns: 6fr 5fr;
    gap: 34px;
    align-items: start;
  }
  .page-about .about-regions {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 34px;
    align-items: start;
  }
  .page-about .about-coverage {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 34px;
    align-items: center;
  }
  .page-about .about-team {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 34px;
    align-items: start;
  }
  .page-about .about-hero__grid {
    grid-template-columns: 6fr 5fr;
    gap: 0;
    align-items: stretch;
    padding-top: 34px;
  }
  .page-about .about-hero__main {
    padding-right: 36px;
  }
  .page-about .about-hero__art {
    border-left: 1px solid var(--c-silver);
    border-radius: 0 var(--radius-m) var(--radius-m) 0;
    margin-left: 36px;
  }
}

/* ---------- 桌面：左侧年份轨道 ---------- */
@media (min-width: 900px) {
  .page-about .about-shell {
    display: grid;
    grid-template-columns: 74px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }
  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 104px;
    padding-top: 40px;
  }
  .page-about .about-rail__label {
    margin: 0;
    color: var(--c-muted);
    padding-left: 2px;
  }
  .page-about .about-rail__list {
    list-style: none;
    margin: 12px 0 0;
    padding: 0;
    border-left: 1px solid var(--c-silver);
  }
  .page-about .about-rail__link {
    display: block;
    margin-left: -1px;
    padding: 9px 0 9px 12px;
    border-left: 2px solid transparent;
    font-size: 12.5px;
    letter-spacing: 0.08em;
    color: var(--c-muted);
    text-decoration: none;
    transition: color 0.24s ease, border-color 0.24s ease, background 0.24s ease;
  }
  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    color: var(--c-ink);
    border-left-color: var(--c-orange);
    background: linear-gradient(90deg, rgba(226, 112, 58, 0.14), rgba(226, 112, 58, 0));
  }
  .page-about .about-flow {
    padding-top: 40px;
  }
  .page-about .about-claims__item {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 22px;
    padding: 28px 0;
  }
  .page-about .about-claims__num {
    font-size: 44px;
  }
  .page-about .about-claims__title {
    font-size: 1.35rem;
  }
  .page-about .about-stage__summary {
    padding: 20px 48px 20px 24px;
  }
  .page-about .about-stage__year {
    font-size: 24px;
  }
  .page-about .about-stage__label {
    font-size: 16px;
  }
  .page-about .about-stage__body {
    padding: 16px 24px 24px;
    max-width: 58em;
  }
  .page-about .about-coverage__num {
    font-size: 24px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-shell {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 64px;
  }
  .page-about .about-origin {
    grid-template-columns: 13fr 9fr;
  }
  .page-about .about-origin__figure {
    margin-top: 8px;
  }
}
<<<END>>>