.page-about {
  background: var(--porcelain);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.7;
}

.page-about a:focus-visible {
  outline: 2px solid var(--violet);
  outline-offset: 3px;
}

/* 首屏 */
.page-about .about-hero {
  padding: calc(var(--header-h) + 28px) 0 48px;
  border-bottom: 1px solid var(--line-soft);
  background:
    radial-gradient(90% 70% at 94% -10%, rgba(230, 0, 126, .12), transparent 62%),
    radial-gradient(80% 62% at -8% 112%, rgba(198, 161, 91, .18), transparent 58%),
    var(--porcelain);
}

.page-about .breadcrumb {
  margin-bottom: 26px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 34px;
}

.page-about .about-hero .display {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(34px, 6.6vw, 68px);
  line-height: 1.08;
  letter-spacing: -.01em;
  margin: 10px 0 0;
}

.page-about .about-hero .lede {
  margin: 18px 0 0;
  font-size: 16px;
  max-width: 46ch;
  color: var(--muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .hero-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 15px 16px;
  background: #ffffff;
  border: 1px solid var(--line-soft);
  border-radius: 2px;
  box-shadow: var(--shadow-1);
}

.page-about .hero-stat__num {
  font-family: var(--mono);
  font-size: clamp(22px, 4.4vw, 30px);
  line-height: 1.15;
  letter-spacing: -.02em;
  color: var(--wine);
}

.page-about .hero-stat__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .hero-stat--accent {
  background: var(--velvet);
  border-color: rgba(198, 161, 91, .5);
}

.page-about .hero-stat--accent .hero-stat__num {
  color: var(--gold);
}

.page-about .hero-stat--accent .hero-stat__label {
  color: rgba(247, 243, 244, .74);
}

/* 主体两栏 */
.page-about .about-body {
  display: grid;
  gap: 28px;
  padding-top: 44px;
  padding-bottom: 72px;
}

.page-about .about-index {
  display: none;
}

.page-about .sticky-index .eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--gold);
  margin: 0;
}

.page-about .index-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
}

.page-about .index-link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 8px 0 8px 11px;
  border-left: 1px solid var(--line);
  color: var(--muted);
  text-decoration: none;
  font-size: 13.5px;
  line-height: 1.45;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .index-link:hover,
.page-about .index-link:focus-visible {
  color: var(--ink);
  border-left-color: var(--pink);
}

.page-about .index-link__num {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--pink-deep);
}

.page-about .about-index__note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-index__note a {
  color: var(--pink-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 章节 */
.page-about .about-sec {
  padding: 36px 0;
  border-top: 1px solid var(--line-soft);
}

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

.page-about .about-sec .eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--muted);
  margin: 0;
}

.page-about .sec-num {
  display: inline-block;
  margin-right: 8px;
  color: var(--gold);
}

.page-about .about-sec .sec-title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(25px, 3.8vw, 38px);
  line-height: 1.2;
  letter-spacing: -.01em;
  margin: 8px 0 10px;
}

.page-about .about-sec .lede {
  margin: 0;
  font-size: 15.5px;
  max-width: 54ch;
  color: var(--muted);
}

.page-about .about-prose {
  margin-top: 20px;
}

.page-about .about-prose p {
  margin: 0 0 13px;
  font-size: 15.5px;
  line-height: 1.78;
}

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

.page-about .about-prose a {
  color: var(--pink-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 场景卡 */
.page-about .about-cards {
  display: grid;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-card {
  padding: 18px;
  background: #ffffff;
  border: 1px solid var(--line-soft);
  border-radius: 2px;
  box-shadow: var(--shadow-1);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease);
}

.page-about .about-card:hover {
  transform: translateY(-2px);
  border-color: var(--pink);
  box-shadow: var(--shadow-2);
}

.page-about .about-card__tag {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .12em;
  color: var(--gold);
}

.page-about .about-card__title {
  font-family: var(--serif);
  font-size: 17.5px;
  line-height: 1.35;
  margin: 0 0 8px;
}

.page-about .about-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.68;
  color: var(--muted);
}

/* 服务主线 */
.page-about .service-list {
  margin-top: 26px;
  border-top: 1px solid var(--line);
}

.page-about .service-line {
  display: grid;
  gap: 6px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .service-line__num {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--pink-deep);
}

.page-about .service-line__body h3 {
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.3;
  margin: 0 0 8px;
}

.page-about .service-line__body p {
  margin: 0 0 8px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .service-line__body .service-line__meta {
  margin: 0;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--teal);
}

/* 会员档位 */
.page-about .tier-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .tier {
  padding: 16px 18px;
  background: var(--mist);
  border: 1px solid var(--line-soft);
  border-radius: 2px;
}

.page-about .tier__name {
  margin: 0 0 6px;
  font-family: var(--serif);
  font-size: 17px;
  letter-spacing: .02em;
}

.page-about .tier__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .tier--top {
  background: var(--wine);
  border-color: var(--wine);
  color: var(--porcelain);
}

.page-about .tier--top .tier__desc {
  color: rgba(247, 243, 244, .8);
}

/* 权益矩阵 */
.page-about .benefit-groups {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}

.page-about .benefit-group {
  position: relative;
  padding: 18px;
  background: #ffffff;
  border: 1px solid var(--line-soft);
  border-radius: 2px;
  box-shadow: var(--shadow-1);
}

.page-about .benefit-group::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 46px;
  height: 2px;
  background: var(--gold);
}

.page-about .benefit-group__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
}

.page-about .benefit-group__title {
  font-family: var(--serif);
  font-size: 18px;
  margin: 0;
}

.page-about .benefit-group__count {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--muted);
}

.page-about .benefit-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .benefit-list li {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 10px;
  font-size: 14px;
  line-height: 1.62;
}

.page-about .benefit-code {
  font-family: var(--mono);
  font-size: 10.5px;
  line-height: 1.9;
  color: var(--pink-deep);
}

/* 图 */
.page-about .about-figure {
  margin: 26px 0 0;
}

.page-about .about-figure .figure__media {
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: 2px;
  background: linear-gradient(150deg, var(--nude), var(--mist) 58%, var(--porcelain));
}

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

.page-about .about-figure--wide .figure__media {
  aspect-ratio: 14 / 9;
}

.page-about .about-figure--tall .figure__media {
  aspect-ratio: 4 / 5;
}

.page-about .about-figure--square .figure__media {
  aspect-ratio: 4 / 3;
}

.page-about .about-figure .figure__cap {
  margin-top: 9px;
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.6;
  color: var(--muted);
}

/* 图文分栏 */
.page-about .split {
  display: grid;
  gap: 22px;
  margin-top: 6px;
}

.page-about .split .about-prose {
  margin-top: 0;
}

.page-about .split .about-figure {
  margin-top: 0;
}

.page-about .team-links {
  font-size: 14px;
  color: var(--muted);
}

/* 时间轴 */
.page-about .stage-track {
  position: relative;
  display: grid;
  gap: 26px;
  margin-top: 28px;
  padding-left: 22px;
  border-left: 1px solid var(--line);
}

.page-about .stage {
  position: relative;
}

.page-about .stage::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--pink);
}

.page-about .stage__tag {
  margin: 0 0 6px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .12em;
  color: var(--gold);
}

.page-about .stage__title {
  font-family: var(--serif);
  font-size: 19px;
  margin: 0 0 8px;
}

.page-about .stage__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* 理由与收束 */
.page-about .why-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .why-item {
  padding: 16px 18px;
  background: #ffffff;
  border-left: 2px solid var(--pink);
  box-shadow: var(--shadow-1);
}

.page-about .why-item h3 {
  font-family: var(--serif);
  font-size: 16.5px;
  margin: 0 0 6px;
}

.page-about .why-item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--muted);
}

.page-about .about-cta {
  display: grid;
  gap: 16px;
  margin-top: 28px;
  padding: 26px 22px;
  background: var(--velvet);
  color: var(--porcelain);
  border-radius: 2px;
}

.page-about .about-cta__title {
  font-family: var(--serif);
  font-size: clamp(20px, 2.8vw, 26px);
  line-height: 1.25;
  margin: 0 0 8px;
  color: var(--porcelain);
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(247, 243, 244, .76);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-cta__actions .btn--outline {
  color: var(--porcelain);
  border-color: rgba(247, 243, 244, .45);
}

.page-about .about-cta__actions .btn--outline:hover {
  border-color: var(--gold);
  color: var(--gold);
}

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

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

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

@media (min-width: 820px) {
  .page-about .service-line {
    grid-template-columns: 52px minmax(0, 1fr);
    gap: 22px;
    padding: 24px 0;
  }

  .page-about .service-line__num {
    padding-top: 5px;
  }

  .page-about .split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 36px;
    align-items: start;
    margin-top: 12px;
  }

  .page-about .stage-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    padding-left: 0;
    border-left: 0;
    margin-top: 30px;
  }

  .page-about .stage {
    padding: 24px 28px 0 0;
    border-top: 1px solid var(--line);
  }

  .page-about .stage::before {
    left: 0;
    top: -4px;
  }

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 32px 34px;
  }
}

@media (min-width: 940px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 44px) 0 62px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 60px;
    align-items: end;
  }

  .page-about .about-hero__stats {
    align-self: stretch;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 236px) minmax(0, 1fr);
    gap: 64px;
    padding-top: 60px;
    padding-bottom: 96px;
    align-items: start;
  }

  .page-about .about-index {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .about-sec {
    padding: 44px 0;
  }

  .page-about .about-sec:first-child {
    padding-top: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-card,
  .page-about .index-link {
    transition: none;
  }

  .page-about .about-card:hover {
    transform: none;
  }
}