.page-about {
  --about-rail: 13rem;
  --about-radius: 3px;
  background: var(--c-mist);
  color: var(--c-ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 3rem) 0 3.5rem;
  background:
    radial-gradient(92% 78% at 86% 2%, rgba(140, 29, 47, 0.62), rgba(140, 29, 47, 0) 62%),
    linear-gradient(156deg, #25375d 0%, #1b2a4a 46%, #101a2e 100%);
  color: var(--c-mist);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(108deg, rgba(247, 242, 232, 0.07) 0 1px, transparent 1px 28px);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: 2.25rem;
}

.page-about .about-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  margin: 0 0 1.1rem;
  font-family: var(--font-num);
  font-size: var(--step--1);
  letter-spacing: 0.22em;
  color: var(--c-gold-soft);
}

.page-about .about-hero__kicker::before {
  content: "";
  width: 2rem;
  height: 2px;
  background: var(--c-gold);
}

.page-about .about-hero__title {
  margin: 0 0 1.15rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2.35rem, 7.2vw, 4.6rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
}

.page-about .about-hero__title em {
  display: block;
  font-style: normal;
  color: var(--c-gold);
}

.page-about .about-hero__lede {
  max-width: 34rem;
  margin: 0 0 1.9rem;
  font-size: var(--step-1);
  line-height: 1.85;
  color: var(--c-mist-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.page-about .about-hero__actions a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.5rem;
  border: 1px solid transparent;
  border-radius: var(--about-radius);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: background-color 0.22s var(--ease-out), color 0.22s var(--ease-out), border-color 0.22s var(--ease-out);
}

.page-about .about-hero__actions .btn--solid {
  background: var(--c-crimson);
  border-color: var(--c-crimson);
  color: var(--c-mist);
}

.page-about .about-hero__actions .btn--solid:hover,
.page-about .about-hero__actions .btn--solid:focus-visible {
  background: var(--c-gold);
  border-color: var(--c-gold);
  color: var(--c-indigo);
}

.page-about .about-hero__actions .btn--ghost {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(247, 242, 232, 0.42);
  color: var(--c-mist);
}

.page-about .about-hero__actions .btn--ghost:hover,
.page-about .about-hero__actions .btn--ghost:focus-visible {
  border-color: var(--c-gold);
  color: var(--c-gold-soft);
}

.page-about .about-hero__figure {
  margin: 0;
  border: 1px solid rgba(247, 242, 232, 0.2);
  border-radius: var(--about-radius);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.06);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 6;
  object-fit: cover;
}

.page-about .about-hero__figure figcaption {
  padding: 0.7rem 0.9rem 0.85rem;
  font-size: var(--step--1);
  letter-spacing: 0.05em;
  color: var(--c-mist-soft);
  border-top: 1px solid rgba(247, 242, 232, 0.16);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: 1.5rem;
}

.page-about .about-crumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--step--1);
  letter-spacing: 0.05em;
  color: var(--c-ink-soft);
}

.page-about .about-crumb__item:not(:first-child)::before {
  content: "/";
  margin-right: 0.45rem;
  color: var(--c-line-strong);
}

.page-about .about-crumb__item a {
  color: var(--c-turquoise);
  text-decoration: none;
}

.page-about .about-crumb__item a:hover,
.page-about .about-crumb__item a:focus-visible {
  text-decoration: underline;
}

.page-about .about-crumb__item[aria-current="page"] {
  color: var(--c-crimson);
  font-weight: 700;
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: 1.5rem;
  padding: 1.75rem 0 3.5rem;
}

.page-about .about-rail {
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-rail__title {
  margin: 0 0 0.6rem;
  font-family: var(--font-num);
  font-size: 0.78rem;
  letter-spacing: 0.26em;
  color: var(--c-crimson);
}

.page-about .about-rail__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.9rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rail__item a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  padding: 0.2rem 0;
  font-size: var(--step--1);
  color: var(--c-ink-soft);
  text-decoration: none;
  transition: color 0.2s var(--ease-out);
}

.page-about .about-rail__num {
  font-family: var(--font-num);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  color: var(--c-gold);
}

.page-about .about-rail__item a:hover,
.page-about .about-rail__item a:focus-visible,
.page-about .about-rail__item a[aria-current="true"] {
  color: var(--c-crimson);
  font-weight: 700;
}

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

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding: 2.4rem 0 3rem;
  border-top: 1px solid var(--c-line);
}

.page-about .about-sec:first-child {
  padding-top: 1rem;
  border-top: 0;
}

.page-about .about-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 0.9rem;
  font-family: var(--font-num);
  font-size: var(--step--1);
  letter-spacing: 0.22em;
  color: var(--c-crimson);
}

.page-about .about-eyebrow::before {
  content: "";
  width: 1.6rem;
  height: 2px;
  background: var(--c-gold);
}

.page-about .about-eyebrow--light {
  color: var(--c-gold-soft);
}

.page-about .about-eyebrow--light::before {
  background: var(--c-gold);
}

.page-about .about-sec__title {
  margin: 0 0 1.15rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: var(--step-3);
  line-height: 1.24;
  letter-spacing: -0.012em;
  max-width: 22ch;
}

.page-about .about-sec__title--light {
  color: var(--c-mist);
}

.page-about .about-sec__lede {
  max-width: 40rem;
  margin: 0 0 1.4rem;
  font-size: var(--step-0);
  line-height: 1.9;
  color: var(--c-ink-soft);
}

.page-about .about-prose p {
  max-width: 42rem;
  margin: 0 0 1.05rem;
  font-size: var(--step-0);
  line-height: 1.9;
  color: var(--c-ink);
}

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

/* ---------- 数字条 ---------- */
.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.15rem 1rem;
  margin: 1.9rem 0 0;
  padding: 1.4rem 0 0;
  list-style: none;
  border-top: 1px solid var(--c-line-strong);
}

.page-about .about-figures__num {
  display: block;
  font-family: var(--font-num);
  font-size: var(--step-3);
  line-height: 1;
  color: var(--c-crimson);
}

.page-about .about-figures__key {
  display: block;
  margin-top: 0.35rem;
  font-size: var(--step--1);
  letter-spacing: 0.06em;
  color: var(--c-ink-soft);
}

/* ---------- 会馆式服务（藏红实色区） ---------- */
.page-about .about-band {
  position: relative;
  margin: 2.4rem 0;
  padding: 2rem 1.25rem 2.25rem;
  border-radius: var(--about-radius);
  overflow: hidden;
}

.page-about .about-band--crimson {
  background: linear-gradient(152deg, var(--c-crimson) 0%, var(--c-crimson-deep) 100%);
  color: var(--c-mist);
}

.page-about .about-band--crimson::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(108deg, rgba(247, 242, 232, 0.07) 0 1px, transparent 1px 30px);
  pointer-events: none;
}

.page-about .about-band > * {
  position: relative;
  z-index: 1;
}

.page-about .about-band__lede {
  max-width: 38rem;
  margin: 0 0 1.5rem;
  font-size: var(--step-0);
  line-height: 1.9;
  color: rgba(247, 242, 232, 0.86);
}

.page-about .about-band__media {
  margin: 0 0 1.5rem;
}

.page-about .about-band__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid rgba(247, 242, 232, 0.28);
  border-radius: var(--about-radius);
}

.page-about .about-glass-grid {
  display: grid;
  gap: 0.85rem;
}

.page-about .about-glass {
  padding: 1.1rem 1rem;
  border: 1px solid rgba(247, 242, 232, 0.3);
  border-radius: var(--about-radius);
  background: rgba(255, 255, 255, 0.13);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.page-about .about-glass h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: var(--step-1);
  letter-spacing: 0.02em;
  color: var(--c-gold-soft);
}

.page-about .about-glass p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.82;
  color: rgba(247, 242, 232, 0.9);
}

/* ---------- 六代时间线 ---------- */
.page-about .about-tl {
  margin: 1.9rem 0 0;
  padding: 0 0 0 1.4rem;
  list-style: none;
  border-left: 1px solid var(--c-line-strong);
  display: grid;
  gap: 0.8rem;
}

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

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: calc(-1.4rem - 5px);
  top: 1.15rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-gold);
  box-shadow: 0 0 0 3px var(--c-mist);
}

.page-about .about-tl__card {
  padding: 0.85rem 1rem;
  border: 1px solid var(--c-line);
  border-radius: var(--about-radius);
  background: rgba(255, 255, 255, 0.72);
  transition: border-color 0.22s var(--ease-out), box-shadow 0.22s var(--ease-out);
}

.page-about .about-tl__card:hover {
  border-color: var(--c-line-strong);
}

.page-about .about-tl__card[open] {
  border-color: var(--c-gold);
  box-shadow: var(--shadow-lift);
}

.page-about .about-tl summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.45rem 0.7rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-weight: 800;
}

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

.page-about .about-tl summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-num);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--c-crimson);
}

.page-about .about-tl__card[open] summary::after {
  content: "–";
  color: var(--c-gold);
}

.page-about .about-tl summary:focus-visible {
  outline: 2px solid var(--c-turquoise);
  outline-offset: 4px;
}

.page-about .about-tl__gen {
  font-family: var(--font-num);
  font-size: 0.92rem;
  letter-spacing: 0.1em;
  color: var(--c-crimson);
}

.page-about .about-tl__year {
  font-family: var(--font-num);
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  color: var(--c-gold);
}

.page-about .about-tl__name {
  font-size: var(--step-0);
  color: var(--c-ink);
}

.page-about .about-tl__card p {
  margin: 0.7rem 0 0;
  max-width: 38rem;
  font-size: 0.95rem;
  line-height: 1.82;
  color: var(--c-ink-soft);
}

/* ---------- 审核清单 ---------- */
.page-about .about-checks {
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.75rem;
}

.page-about .about-checks li {
  position: relative;
  padding: 0.85rem 1rem 0.85rem 2.3rem;
  border-left: 2px solid var(--c-turquoise);
  background: rgba(255, 255, 255, 0.6);
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--c-ink-soft);
}

.page-about .about-checks li::before {
  content: "✓";
  position: absolute;
  left: 0.85rem;
  top: 0.85rem;
  color: var(--c-turquoise);
  font-weight: 700;
}

.page-about .about-checks strong {
  color: var(--c-indigo);
}

/* ---------- 协作网络 ---------- */
.page-about .about-network__media {
  margin: 0 0 1.5rem;
}

.page-about .about-network__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
  border-radius: var(--about-radius);
  border: 1px solid var(--c-line);
}

.page-about .about-roles {
  display: grid;
  gap: 1rem;
}

.page-about .about-role {
  padding: 0.25rem 0 0.25rem 0.95rem;
  border-left: 3px solid var(--c-turquoise);
}

.page-about .about-role__count {
  display: block;
  font-family: var(--font-num);
  font-size: var(--step-2);
  line-height: 1.1;
  color: var(--c-turquoise);
}

.page-about .about-role h3 {
  margin: 0.25rem 0 0.45rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: var(--step-0);
  color: var(--c-indigo);
}

.page-about .about-role p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--c-ink-soft);
}

.page-about .about-scale {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 1.75rem;
  padding: 1.25rem 0 0;
  border-top: 1px solid var(--c-line-strong);
}

.page-about .about-scale__num {
  display: block;
  font-family: var(--font-num);
  font-size: var(--step-2);
  line-height: 1.15;
  color: var(--c-crimson);
}

.page-about .about-scale__key {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--c-ink-soft);
}

.page-about .about-scale__note {
  margin: 1rem 0 0;
  font-size: var(--step--1);
  line-height: 1.8;
  color: var(--c-ink-soft);
}

/* ---------- 行业认可 ---------- */
.page-about .about-honor-grid {
  display: grid;
  gap: 1rem;
}

.page-about .about-honor {
  position: relative;
  padding: 1.3rem 1.1rem 1.2rem;
  border: 1px solid var(--c-line-strong);
  border-radius: var(--about-radius);
  background: rgba(255, 255, 255, 0.62);
  transition: border-color 0.24s var(--ease-out), background-color 0.24s var(--ease-out);
}

.page-about .about-honor::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3.2rem;
  height: 3px;
  background: var(--c-gold);
}

.page-about .about-honor:hover {
  border-color: var(--c-gold);
  background: rgba(242, 217, 160, 0.24);
}

.page-about .about-honor__tag {
  margin: 0 0 0.55rem;
  font-family: var(--font-num);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  color: var(--c-crimson);
}

.page-about .about-honor h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: var(--step-1);
  line-height: 1.35;
  color: var(--c-indigo);
}

.page-about .about-honor__lead {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--c-ink-soft);
}

.page-about .about-honor__note {
  margin: 0.7rem 0 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--c-ink-soft);
  border-top: 1px dashed var(--c-line-strong);
  padding-top: 0.7rem;
}

/* ---------- 下一步 ---------- */
.page-about .about-next__grid {
  display: grid;
  gap: 0.8rem;
}

.page-about .about-next__link {
  display: block;
  padding: 1.15rem 1.1rem;
  border: 1px solid var(--c-line-strong);
  border-radius: var(--about-radius);
  background: rgba(255, 255, 255, 0.58);
  color: var(--c-ink);
  text-decoration: none;
  transition: transform 0.22s var(--ease-out), border-color 0.22s var(--ease-out), box-shadow 0.22s var(--ease-out);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  transform: translateY(-3px);
  border-color: var(--c-gold);
  box-shadow: var(--shadow-lift);
}

.page-about .about-next__label {
  display: block;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: var(--step-1);
  color: var(--c-crimson);
}

.page-about .about-next__desc {
  display: block;
  margin-top: 0.45rem;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--c-ink-soft);
}

.page-about .about-next__note {
  margin: 1.2rem 0 0;
  font-size: var(--step--1);
  line-height: 1.8;
  color: var(--c-ink-soft);
}

/* ---------- 平板 ---------- */
@media (min-width: 560px) {
  .page-about .about-glass-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.15rem;
  }

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

  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 4.5rem) 0 5.5rem;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: center;
    gap: 3.5rem;
  }

  .page-about .about-hero__figure img {
    aspect-ratio: 5 / 6;
    max-height: 32rem;
  }

  .page-about .about-crumb {
    padding-top: 2rem;
  }

  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 4rem;
    padding: 2rem 0 6rem;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 1.75rem);
    align-self: start;
    padding: 0.25rem 0 0.25rem 1rem;
    border-bottom: 0;
    border-left: 1px solid var(--c-line-strong);
  }

  .page-about .about-rail__list {
    display: block;
  }

  .page-about .about-rail__item {
    margin-bottom: 0.9rem;
  }

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

  .page-about .about-rail__item a {
    padding: 0;
  }

  .page-about .about-rail__txt {
    display: block;
  }

  .page-about .about-sec {
    padding: 3.5rem 0 4rem;
  }

  .page-about .about-sec:first-child {
    padding-top: 0.5rem;
  }

  .page-about .about-band {
    margin: 3rem 0;
    padding: 2.75rem 2.5rem 3rem;
  }

  .page-about .about-band__media {
    margin-bottom: 1.75rem;
  }

  .page-about .about-honor {
    padding: 1.5rem 1.4rem 1.4rem;
  }
}

/* ---------- 悬停展开（仅桌面指针设备） ---------- */
@media (hover: hover) and (min-width: 900px) {
  .page-about .about-honor__note {
    max-height: 0;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.28s var(--ease-out), opacity 0.28s var(--ease-out), margin-top 0.28s var(--ease-out), padding-top 0.28s var(--ease-out);
  }

  .page-about .about-honor:hover .about-honor__note {
    max-height: 14rem;
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top-color: var(--c-line-strong);
    opacity: 1;
  }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-next__link,
  .page-about .about-tl__card,
  .page-about .about-honor,
  .page-about .about-hero__actions a {
    transition: none;
  }

  .page-about .about-next__link:hover,
  .page-about .about-next__link:focus-visible {
    transform: none;
  }
}