.page-about {
  --about-toc-w: 15.5rem;
  --about-gap: 3.5rem;
  --about-rule: rgba(200, 162, 74, 0.4);
  --about-paper: #fffdf9;
  --about-indigo-line: rgba(228, 205, 146, 0.28);
}

/* ---------- 首屏 ---------- */
.page-about__hero {
  position: relative;
  padding: clamp(1.5rem, 4vw, 2.5rem) 0 clamp(2.5rem, 7vw, 5rem);
  background:
    radial-gradient(120% 95% at 10% -10%, rgba(200, 162, 74, 0.26), transparent 58%),
    radial-gradient(90% 80% at 100% 110%, rgba(18, 54, 60, 0.45), transparent 62%),
    linear-gradient(158deg, #5e1b2a 0%, #3a0f1b 100%);
  color: var(--marble);
  overflow: hidden;
}

.page-about__hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--it-green) 0 33.3%, var(--marble) 33.3% 66.6%, var(--it-red) 66.6% 100%);
  opacity: 0.85;
}

.page-about__crumb {
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.page-about__crumb .salon-breadcrumb__link {
  color: rgba(246, 242, 236, 0.78);
  border-bottom: 1px solid rgba(228, 205, 146, 0.42);
}

.page-about__crumb .salon-breadcrumb__link:hover {
  color: var(--oro-pale);
}

.page-about__crumb .salon-breadcrumb__sep,
.page-about__crumb .salon-breadcrumb__current {
  color: rgba(246, 242, 236, 0.55);
}

.page-about__frame {
  position: relative;
  border: 1px solid rgba(228, 205, 146, 0.34);
  padding: clamp(1.5rem, 5vw, 3.25rem);
  max-width: 62rem;
}

.page-about__h1 {
  margin: 0.6rem 0 1.1rem;
  color: var(--marble);
  line-height: 1.04;
}

.page-about__lede {
  max-width: 44rem;
  color: rgba(246, 242, 236, 0.86);
  font-size: clamp(1rem, 1.4vw, 1.125rem);
}

.page-about__quick {
  margin-top: 1.75rem;
}

.page-about__quick .salon-quick__link {
  color: var(--oro-pale);
  border-bottom: 1px solid rgba(228, 205, 146, 0.4);
}

.page-about__quick .salon-quick__link:hover {
  color: var(--marble);
}

/* ---------- 主体骨架 ---------- */
.page-about__body {
  background: var(--marble);
  padding: clamp(2rem, 5vw, 3.5rem) 0 clamp(3rem, 8vw, 5.5rem);
}

.page-about__shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
}

.page-about__toc {
  background: var(--about-paper);
  border: 1px solid var(--stone-deep);
  border-top: 3px solid var(--oro);
  padding: 1.1rem 1rem;
}

.page-about__toc .salon-toc__title {
  margin: 0 0 0.85rem;
}

.page-about__toc .salon-toc__list {
  display: grid;
  gap: 0.15rem;
}

.page-about__toc .salon-toc__link {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.45rem 0.35rem;
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--ink-soft);
  border-left: 2px solid transparent;
  text-decoration: none;
  transition: color 200ms ease, border-color 200ms ease, background-color 200ms ease;
}

.page-about__toc .salon-toc__link:hover {
  color: var(--barolo);
  border-left-color: var(--oro);
  background: rgba(200, 162, 74, 0.08);
}

.page-about__toc .salon-toc__link[aria-current="true"] {
  color: var(--barolo);
  border-left-color: var(--it-green);
  font-weight: 500;
  background: rgba(14, 122, 76, 0.06);
}

.page-about__toc-num {
  font-family: var(--font-index);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--oro);
}

.page-about__chapters {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  min-width: 0;
}

/* ---------- 章节通用 ---------- */
.page-about__chapter {
  position: relative;
  padding: clamp(1.5rem, 4vw, 3rem);
  border-radius: var(--radius);
  min-width: 0;
  overflow-wrap: break-word;
}

.page-about__chapter--marble {
  background-color: var(--about-paper);
  background-image:
    linear-gradient(115deg, rgba(218, 213, 205, 0.34) 0%, transparent 42%),
    radial-gradient(60% 40% at 88% 6%, rgba(200, 162, 74, 0.1), transparent 70%);
  border: 1px solid var(--stone);
}

.page-about__chapter--stone {
  background: var(--stone);
  border: 1px solid var(--stone-deep);
}

.page-about__chapter--indigo {
  background:
    radial-gradient(100% 70% at 100% 0%, rgba(200, 162, 74, 0.2), transparent 60%),
    linear-gradient(165deg, #12363c 0%, #0c272c 100%);
  color: rgba(246, 242, 236, 0.9);
}

.page-about__head {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--about-rule);
}

.page-about__chapter--indigo .page-about__head {
  border-bottom-color: var(--about-indigo-line);
}

.page-about__head-text {
  min-width: 0;
}

.page-about__head .salon-eyebrow {
  margin: 0 0 0.35rem;
}

.page-about__chapter--indigo .salon-eyebrow {
  color: var(--oro-pale);
}

.page-about__head .salon-title-lg {
  margin: 0;
}

.page-about__chapter--indigo .salon-title-lg {
  color: var(--marble);
}

.page-about__lead {
  max-width: 46rem;
  margin: 0 0 1.75rem;
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about__chapter--indigo .page-about__lead {
  color: rgba(246, 242, 236, 0.82);
}

.page-about__prose p {
  margin: 0 0 1.05rem;
  max-width: 42rem;
}

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

.page-about__chapter--indigo .page-about__prose p {
  color: rgba(246, 242, 236, 0.84);
}

.page-about__note {
  margin-top: 1.5rem;
  max-width: 44rem;
  display: block;
}

.page-about__chapter--indigo .salon-note {
  color: rgba(228, 205, 146, 0.8);
}

/* ---------- 图文分栏 ---------- */
.page-about__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 2.25rem);
  align-items: start;
}

.page-about__media-tall,
.page-about__media-square,
.page-about__media-wide {
  margin: 0;
}

.page-about__media-tall .salon-media__img,
.page-about__media-square .salon-media__img {
  width: 100%;
  height: auto;
  object-fit: cover;
  display: block;
}

.page-about__media-tall .salon-media__img {
  aspect-ratio: 4 / 5;
}

.page-about__media-square .salon-media__img {
  aspect-ratio: 1 / 1;
}

.page-about__media-wide {
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about__media-wide .salon-media__img {
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  display: block;
}

.page-about__split .salon-media {
  overflow: hidden;
  transition: transform 600ms ease, filter 600ms ease;
}

.page-about__split .salon-media .salon-media__img {
  transition: transform 600ms ease;
}

.page-about__split .salon-media:hover .salon-media__img {
  transform: scale(1.02);
  filter: brightness(1.04);
}

/* ---------- 团队 ---------- */
.page-about__crews {
  list-style: none;
  margin: 0 0 2rem;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-about__crew {
  background: var(--about-paper);
  border: 1px solid var(--stone-deep);
  border-left: 3px solid var(--barolo);
  padding: 1.1rem 1.15rem 1.25rem;
}

.page-about__stamp-sm {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  font-size: 0.75rem;
  margin-bottom: 0.65rem;
}

.page-about__crew-title {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--barolo);
}

.page-about__crew-text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about__flow {
  background: rgba(94, 27, 42, 0.05);
  border: 1px dashed var(--about-rule);
  padding: 1.1rem 1.15rem 1.25rem;
}

.page-about__flow-list {
  list-style: none;
  margin: 0.75rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.page-about__flow-item {
  display: flex;
  gap: 0.7rem;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--ink);
}

.page-about__flow-num {
  flex: 0 0 auto;
  width: 1.5rem;
  height: 1.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-index);
  font-size: 0.6875rem;
  color: var(--marble);
  background: var(--barolo);
  border-radius: 50%;
}

/* ---------- 迭代时间轴 ---------- */
.page-about__timeline {
  display: grid;
  gap: 0.35rem;
}

.page-about__stage {
  position: relative;
  padding: 0.5rem 0 0.5rem 2.4rem;
  border-bottom: 1px solid var(--about-indigo-line);
}

.page-about__stage:last-child {
  border-bottom: none;
}

.page-about__stage::before {
  content: "";
  position: absolute;
  left: 0.35rem;
  top: 1.05rem;
  width: 0.625rem;
  height: 0.625rem;
  border-radius: 50%;
  background: var(--oro);
  box-shadow: 0 0 0 3px rgba(200, 162, 74, 0.18);
}

.page-about__stage::after {
  content: "";
  position: absolute;
  left: 0.62rem;
  top: 1.9rem;
  bottom: -0.35rem;
  width: 1px;
  background: var(--about-indigo-line);
}

.page-about__stage:last-child::after {
  display: none;
}

.page-about__stage-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.65rem;
  cursor: pointer;
  list-style: none;
  padding: 0.35rem 0;
}

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

.page-about__stage-summary::marker {
  content: "";
}

.page-about__stage-num {
  font-family: var(--font-index);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--oro-pale);
}

.page-about__stage-name {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--marble);
  border-bottom: 1px solid transparent;
  transition: border-color 200ms ease, color 200ms ease;
}

.page-about__stage-summary:hover .page-about__stage-name {
  color: var(--oro);
  border-bottom-color: var(--about-indigo-line);
}

.page-about__stage[open] .page-about__stage-name {
  color: var(--oro);
}

.page-about__stage-text {
  margin: 0.35rem 0 0.6rem;
  max-width: 46rem;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: rgba(246, 242, 236, 0.8);
}

/* ---------- 服务承诺 ---------- */
.page-about__promises {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-about__promise {
  background: var(--about-paper);
  border: 1px solid var(--stone-deep);
  border-top: 3px solid var(--oro);
  height: 100%;
}

.page-about__promise p {
  margin: 0.5rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about__promise .salon-eyebrow {
  margin: 0;
}

.page-about__promise .salon-card__title {
  margin: 0.3rem 0 0;
  font-size: 1.1875rem;
  color: var(--barolo);
}

/* ---------- 合作与关键信息 ---------- */
.page-about__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 2.25rem);
  align-items: start;
}

.page-about__facts {
  padding: 1.2rem 1.15rem;
  border: 1px solid var(--about-rule);
  background: linear-gradient(150deg, rgba(94, 27, 42, 0.06), rgba(200, 162, 74, 0.08));
}

.page-about__fact-list {
  margin: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about__fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid rgba(200, 162, 74, 0.28);
}

.page-about__fact:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.page-about__fact-label {
  font-family: var(--font-index);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

.page-about__fact-value {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 500;
  color: var(--barolo);
  text-align: right;
}

.page-about__outro {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  padding-top: 1.4rem;
  border-top: 1px solid var(--about-rule);
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- 断言动效降级 ---------- */
.page-about [data-reveal] {
  opacity: 1;
}

@media (prefers-reduced-motion: no-preference) {
  .page-about [data-reveal] {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 320ms ease, transform 320ms cubic-bezier(0.22, 0.68, 0.32, 1);
  }

  .page-about [data-reveal].is-visible {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about__crews {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about__promises > :nth-child(3) {
    grid-column: 1 / -1;
  }

  .page-about__split {
    grid-template-columns: minmax(0, 1fr) 15.5rem;
  }

  .page-about__split--reverse {
    grid-template-columns: 15.5rem minmax(0, 1fr);
  }

  .page-about__split--reverse > .page-about__prose {
    order: 2;
  }

  .page-about__split--reverse > .salon-media {
    order: 1;
  }

  .page-about__shell {
    gap: 2.5rem;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about__shell {
    grid-template-columns: var(--about-toc-w) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about__toc {
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
    max-height: calc(100vh - var(--header-h) - 3rem);
    overflow-y: auto;
  }

  .page-about__body {
    padding-bottom: clamp(4rem, 8vw, 6.5rem);
  }

  .page-about__grid {
    grid-template-columns: minmax(0, 1fr) 17rem;
  }

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

  .page-about__promises > :nth-child(3) {
    grid-column: auto;
  }

  .page-about__split {
    grid-template-columns: minmax(0, 1fr) 18rem;
  }

  .page-about__split--reverse {
    grid-template-columns: 18rem minmax(0, 1fr);
  }
}

@media (min-width: 1200px) {
  .page-about__frame {
    padding: clamp(2.5rem, 4vw, 3.75rem) clamp(2.5rem, 4vw, 4rem);
  }
}
<<<END>>>