/* ============================================
   关于四季 /brand/ — 页面专属样式
   作用域：.page-about
   ============================================ */

.page-about {
  --about-hair: var(--rule);
  --about-lead: clamp(1.05rem, 1.4vw, 1.18rem);
  --about-gutter: clamp(1rem, 4vw, 2.5rem);
  background: var(--frost);
  color: var(--body);
}

.page-about [data-season="spring"] {
  --season: var(--spring);
  --season-accent: var(--spring-accent);
}
.page-about [data-season="summer"] {
  --season: var(--summer);
  --season-accent: var(--summer-accent);
}
.page-about [data-season="autumn"] {
  --season: var(--autumn);
  --season-accent: var(--autumn-accent);
}
.page-about [data-season="winter"] {
  --season: var(--winter);
  --season-accent: var(--summer-accent);
}

.page-about .about-crumb {
  padding-top: 1.25rem;
}

/* ---------- 首屏：主题声明 + 目录 ---------- */

.page-about .about-open {
  position: relative;
  padding-block: clamp(1.75rem, 5vw, 3.5rem) clamp(2.25rem, 6vw, 4.5rem);
  background:
    linear-gradient(180deg, rgba(111, 175, 143, 0.16) 0%, rgba(111, 175, 143, 0) 68%),
    var(--frost);
  border-bottom: var(--line);
  overflow: hidden;
}

.page-about .about-open::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  top: 0;
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--spring) 0%,
    var(--summer) 34%,
    var(--autumn) 67%,
    var(--winter) 100%
  );
}

.page-about .about-open__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-open__title {
  margin: 0.6rem 0 1.1rem;
  font-family: var(--font-serif);
  font-size: clamp(1.85rem, 5.6vw, 3.3rem);
  line-height: 1.24;
  font-weight: 700;
  color: var(--winter);
  letter-spacing: 0.01em;
  max-width: 18em;
}

.page-about .about-open__lede {
  font-size: var(--about-lead);
  line-height: 1.85;
  color: var(--body);
  max-width: 34em;
}

.page-about .about-open__note {
  margin-top: 1.25rem;
  padding-left: 0.85rem;
  border-left: 3px solid var(--spring);
  color: var(--muted);
}

.page-about .about-open__figure {
  margin: 0;
}

.page-about .about-open__figure .sk-figure__frame {
  border: var(--line);
  background: var(--paper);
  padding: 0.7rem;
  box-shadow: var(--shadow-paper);
}

.page-about .about-open__figure .sk-figure__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .sk-figure__caption {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-top: 0.75rem;
}

/* ---------- 目录索引 ---------- */

.page-about .about-map {
  padding-block: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-map__label {
  margin: 0 0 1rem;
  font-size: 0.72rem;
  letter-spacing: 0.26em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .about-map__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--line);
}

.page-about .about-map__list .sk-index__item {
  border-bottom: var(--line);
}

.page-about .about-map__list .sk-index__link {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  padding: 0.95rem 0.35rem;
  font-family: var(--font-serif);
  font-size: clamp(1.02rem, 2.5vw, 1.32rem);
  color: var(--winter);
  text-decoration: none;
  transition: background-color 0.25s ease, padding-left 0.25s ease, color 0.25s ease;
}

.page-about .about-map__list .sk-index__num {
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--autumn);
  flex: none;
}

.page-about .about-map__list .sk-index__link:hover,
.page-about .about-map__list .sk-index__link:focus-visible {
  background: rgba(47, 127, 166, 0.07);
  padding-left: 0.9rem;
  color: var(--summer);
  outline: none;
}

.page-about .about-map__list .sk-index__link[aria-current="true"] {
  background: rgba(111, 175, 143, 0.13);
  padding-left: 0.9rem;
}

.page-about .about-map__list .sk-index__link[aria-current="true"] .sk-index__num {
  color: var(--spring);
}

/* ---------- 起点：叙事 + 旁注 ---------- */

.page-about .about-chapter {
  padding-block: clamp(2.25rem, 6vw, 4.5rem);
}

.page-about .about-chapter__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-chapter__title {
  margin-bottom: 1rem;
}

.page-about .about-chapter__aside {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.page-about .about-stamp {
  border: var(--line);
  background: var(--paper);
  padding: 1.25rem 1.15rem 1.35rem;
  border-top: 5px solid var(--spring);
  box-shadow: var(--shadow-paper);
}

.page-about .about-stamp__label {
  margin: 0;
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  color: var(--muted);
}

.page-about .about-stamp__value {
  margin: 0.2rem 0 0.6rem;
  font-size: clamp(2.1rem, 7vw, 3rem);
  line-height: 1;
  font-weight: 600;
  color: var(--spring);
}

.page-about .about-stamp__text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--body);
}

/* ---------- 大事记：纵向时间轴 ---------- */

.page-about .about-chronicle {
  padding-block: clamp(2.5rem, 6vw, 4.75rem);
}

.page-about .about-chronicle__head {
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-chronicle__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0.5rem 0 0;
}

.page-about .about-chronicle__list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 1.6rem;
  bottom: 2.5rem;
  width: 2px;
  background: linear-gradient(
    180deg,
    var(--spring) 0%,
    var(--summer) 36%,
    var(--autumn) 68%,
    var(--winter) 100%
  );
  opacity: 0.55;
}

.page-about .about-chronicle__item {
  position: relative;
  padding: 0 0 clamp(1.75rem, 4vw, 2.5rem) 2.1rem;
}

.page-about .about-chronicle__node {
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--summer);
  box-shadow: 0 0 0 4px var(--frost);
}

.page-about .about-chronicle__item:nth-child(1) .about-chronicle__node { border-color: var(--spring); }
.page-about .about-chronicle__item:nth-child(3) .about-chronicle__node { border-color: var(--autumn); }
.page-about .about-chronicle__item:nth-child(5) .about-chronicle__node { border-color: var(--summer); }
.page-about .about-chronicle__item:nth-child(6) .about-chronicle__node { border-color: var(--winter); }

.page-about .about-chronicle__year {
  margin: 0 0 0.35rem;
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.page-about .about-chronicle__title {
  margin: 0 0 0.45rem;
  font-family: var(--font-serif);
  font-size: clamp(1.12rem, 3vw, 1.42rem);
  font-weight: 700;
  color: var(--winter);
  line-height: 1.5;
}

.page-about .about-chronicle__body {
  margin: 0;
  max-width: 40em;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--body);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  padding-block: clamp(2.5rem, 6vw, 4.75rem);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3.25rem);
}

.page-about .about-team__figure {
  margin: 0;
  order: -1;
}

.page-about .about-team__figure .sk-figure__frame {
  border: var(--line);
  background: var(--paper);
  padding: 0.7rem;
  box-shadow: var(--shadow-paper);
}

.page-about .about-team__figure .sk-figure__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-team__roles {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .about-team__role {
  border: var(--line);
  border-left: 4px solid var(--autumn);
  background: var(--paper);
  padding: 0.95rem 1.05rem;
}

.page-about .about-team__role-name {
  margin: 0 0 0.3rem;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--winter);
}

.page-about .about-team__role-desc {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--body);
}

/* ---------- 服务网络 ---------- */

.page-about .about-network {
  padding-block: clamp(2.5rem, 6vw, 4.75rem);
}

.page-about .about-network__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3.25rem);
}

.page-about .about-network__figure {
  margin: 0;
}

.page-about .about-network__figure .sk-figure__frame {
  border: var(--line);
  background: var(--paper);
  padding: 0.7rem;
  box-shadow: var(--shadow-paper);
}

.page-about .about-network__figure .sk-figure__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-about .about-network__stats {
  margin: clamp(1.5rem, 4vw, 2rem) 0 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-about .about-network__stat {
  border-top: var(--line);
  padding-top: 0.7rem;
}

.page-about .about-network__stat-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-about .about-network__stat-value {
  margin: 0.25rem 0 0;
  font-family: var(--font-sans);
  font-size: 0.98rem;
  color: var(--winter);
}

.page-about .about-network__num {
  display: inline-block;
  min-width: 1.6em;
  font-size: 1.7rem;
  font-weight: 600;
  line-height: 1;
  color: var(--summer);
  margin-right: 0.25rem;
}

/* ---------- 资质与认证 ---------- */

.page-about .about-credentials {
  padding-block: clamp(2.5rem, 6vw, 4.75rem);
}

.page-about .about-credentials__head {
  margin-bottom: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-credentials__grid {
  display: grid;
  gap: 1.1rem;
}

.page-about .about-credentials__card {
  border: var(--line);
  border-top: 5px solid var(--spring);
  padding: 1.4rem 1.25rem 1.5rem;
  background: var(--paper);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.page-about .about-credentials__card:nth-child(2) {
  border-top-color: var(--summer);
}

.page-about .about-credentials__card--wide {
  border-top-color: var(--winter);
}

.page-about .about-credentials__num {
  margin: 0;
  font-size: clamp(2.2rem, 8vw, 3.1rem);
  line-height: 1;
  font-weight: 600;
  color: var(--winter);
  letter-spacing: -0.02em;
}

.page-about .about-credentials__title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--winter);
  line-height: 1.5;
}

.page-about .about-credentials__body {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--body);
}

.page-about .about-credentials__tag {
  align-self: flex-start;
  margin-top: 0.35rem;
  font-size: 0.74rem;
}

/* ---------- 下一步 ---------- */

.page-about .about-next {
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
  background: linear-gradient(180deg, var(--frost) 0%, rgba(217, 211, 199, 0.4) 100%);
  border-top: var(--line);
}

.page-about .about-next__inner {
  display: grid;
  gap: 1.5rem;
}

.page-about .about-next__lede {
  margin: 0.85rem 0 0;
  max-width: 40em;
  font-size: var(--about-lead);
  line-height: 1.85;
  color: var(--body);
}

.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .about-next__list .sk-btn {
  text-decoration: none;
  display: inline-block;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .about-chronicle__item {
    display: grid;
    grid-template-columns: 6.5rem minmax(0, 1fr);
    column-gap: 1.6rem;
    padding-left: 2.5rem;
  }

  .page-about .about-chronicle__item > * {
    grid-column: 2;
  }

  .page-about .about-chronicle__year {
    grid-column: 1;
    grid-row: 1 / span 2;
    text-align: right;
    margin: 0.1rem 0 0;
  }

  .page-about .about-network__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }

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

  .page-about .about-credentials__card--wide {
    grid-column: 1 / -1;
    flex-direction: row;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 0.5rem 1.5rem;
  }

  .page-about .about-credentials__card--wide .about-credentials__num {
    flex: none;
  }

  .page-about .about-credentials__card--wide .about-credentials__title {
    flex: 1 1 12rem;
  }

  .page-about .about-credentials__card--wide .about-credentials__body {
    flex: 1 1 100%;
  }
}

@media (min-width: 940px) {
  .page-about .about-open__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    align-items: center;
    gap: clamp(2rem, 5vw, 4.5rem);
  }

  .page-about .about-chapter__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 18rem);
    gap: clamp(2rem, 6vw, 5rem);
    align-items: start;
  }

  .page-about .about-chapter__aside {
    position: sticky;
    top: 6.5rem;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: start;
  }

  .page-about .about-team__figure {
    order: 0;
    position: sticky;
    top: 6.5rem;
  }

  .page-about .about-network__grid {
    grid-template-columns: minmax(0, 16rem) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
  }

  .page-about .about-network__figure {
    position: sticky;
    top: 6.5rem;
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 2.5rem;
  }
}

@media (min-width: 1120px) {
  .page-about .about-chronicle__list {
    padding-right: 12%;
  }

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

  .page-about .about-team__role {
    display: flex;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-map__list .sk-index__link,
  .page-about [data-reveal] {
    transition: none;
  }
}
<<<END>>>