.page-about {
  --about-rail-w: 14rem;
  background: var(--ivory);
  color: var(--black);
}

.page-about .page-about__crumb {
  padding-top: clamp(1rem, 3vw, 1.5rem);
}

.page-about .breadcrumb {
  font-size: 0.85rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.page-about .breadcrumb a {
  color: var(--red);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  color: var(--gold);
}

/* ---------- 外壳：左窄轨 + 右宽内容 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  padding-top: clamp(1.25rem, 3vw, 2rem);
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

@media (min-width: 960px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4.25rem);
    align-items: start;
  }
}

/* ---------- 左侧章节刻度 ---------- */
.page-about .about-rail {
  border-left: 2px solid var(--line-gold);
  padding-left: 0.9rem;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__head {
  display: none;
  margin: 0 0 0.75rem;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--gold);
  text-transform: uppercase;
}

.page-about .about-rail__list {
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
  min-width: max-content;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.75rem;
  border-radius: var(--r-pill);
  font-size: 0.86rem;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-rail__link:hover {
  color: var(--red);
}

.page-about .about-rail__link.is-active {
  color: var(--red-deep);
  background: rgba(140, 29, 51, 0.08);
}

.page-about .about-rail__num {
  font-size: 0.7rem;
  color: var(--gold);
  letter-spacing: 0.06em;
}

@media (min-width: 960px) {
  .page-about .about-rail {
    position: sticky;
    top: 1.25rem;
    align-self: start;
    overflow: visible;
    padding-left: 1rem;
  }

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

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0.1rem;
    min-width: 0;
  }

  .page-about .about-rail__link {
    width: 100%;
    padding: 0.5rem 0.55rem;
    border-radius: 0.65rem;
    white-space: normal;
    position: relative;
    justify-content: flex-start;
  }

  .page-about .about-rail__link::before {
    content: "";
    flex: 0 0 auto;
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    border: 1.5px solid var(--line-gold);
    transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
  }

  .page-about .about-rail__link.is-active::before {
    background: var(--gold);
    border-color: var(--gold);
  }
}

/* ---------- 右列节奏 ---------- */
.page-about .about-body > * + * {
  margin-top: clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-block {
  scroll-margin-top: 1.5rem;
}

.page-about .eyebrow {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .eyebrow .mono {
  padding: 0.1rem 0.5rem;
  border-radius: var(--r-pill);
  background: var(--gold-light);
  color: var(--red);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
}

.page-about .about-block .section-title {
  margin: 0 0 1.15rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 3.2vw, 2rem);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--red-deep);
}

.page-about .about-block .prose p {
  margin: 0 0 1rem;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--black);
  max-width: 68ch;
}

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

.page-about .about-inline-link {
  color: var(--red);
  text-decoration: underline;
  text-decoration-color: var(--line-gold);
  text-underline-offset: 3px;
}

.page-about .about-inline-link:hover {
  color: var(--gold);
}

/* ---------- 首屏 ---------- */
.page-about .about-lede {
  display: grid;
  gap: 1.75rem;
}

.page-about .about-lede__copy h1 {
  margin: 0.55rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 5.4vw, 3.35rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--red-deep);
}

.page-about .about-lede__text {
  margin: 1rem 0 0;
  font-size: 1.02rem;
  line-height: 1.78;
  color: var(--black);
  max-width: 46ch;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
  margin: 1.6rem 0 0;
}

.page-about .about-stat {
  margin: 0;
  padding: 0.85rem 0.95rem 0.9rem;
  border-radius: 1.15rem;
  background: #ffffff;
  border: 1px solid var(--line);
}

.page-about .about-stat dt {
  font-size: 0.76rem;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.page-about .about-stat dd {
  margin: 0.15rem 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 1.28rem;
  letter-spacing: -0.01em;
  color: var(--red);
}

.page-about .about-lede__fig {
  margin: 0;
  border-radius: var(--r-card);
  overflow: hidden;
  border: 1px solid var(--line-gold);
  box-shadow: var(--shadow-card);
  background: linear-gradient(150deg, var(--ink) 0%, var(--red-deep) 100%);
}

.page-about .about-lede__fig img {
  display: block;
  width: 100%;
  height: auto;
}

@media (min-width: 560px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .about-lede {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 2.25rem;
    align-items: start;
  }
}

/* ---------- 四个板块 ---------- */
.page-about .about-boards {
  display: grid;
  gap: 1.05rem;
}

.page-about .about-board {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding: 1.5rem 1.2rem 1.35rem;
  border-radius: var(--r-card);
  background: #ffffff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
}

.page-about .about-board::before {
  content: "";
  position: absolute;
  top: 1.35rem;
  left: 1.2rem;
  width: 26px;
  height: 3px;
  border-radius: 2px;
  background: var(--gold);
}

.page-about .about-board h3 {
  margin: 1rem 0 0;
  font-family: var(--font-display);
  font-size: 1.14rem;
  font-weight: 700;
  color: var(--red);
}

.page-about .about-board p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.7;
  color: var(--black);
}

.page-about .about-board__scene {
  padding-top: 0.6rem;
  border-top: 1px dashed var(--line);
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.65;
}

.page-about .about-board__link {
  margin-top: auto;
  padding-top: 0.4rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--red);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .about-board__link:hover {
  color: var(--gold);
}

@media (min-width: 720px) {
  .page-about .about-boards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.2rem;
  }
}

@media (min-width: 1120px) {
  .page-about .about-boards {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 深色档案带 ---------- */
.page-about .about-band-dark {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-card);
  padding: clamp(1.6rem, 4.5vw, 3rem) clamp(1.2rem, 4vw, 2.75rem) clamp(1.8rem, 4.5vw, 3.1rem);
  background:
    radial-gradient(130% 110% at 0% 0%, rgba(201, 162, 39, 0.16) 0%, rgba(201, 162, 39, 0) 58%),
    linear-gradient(162deg, var(--ink) 0%, var(--ink-mid) 100%);
  color: var(--ivory);
}

.page-about .about-band-dark .eyebrow {
  color: var(--gold);
}

.page-about .about-band-dark .eyebrow .mono {
  background: rgba(201, 162, 39, 0.2);
  color: var(--gold-light);
}

.page-about .about-band-dark .section-title {
  color: var(--ivory);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.5rem;
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 1.9rem;
}

.page-about .about-timeline__node {
  position: absolute;
  top: 0.4rem;
  left: 0;
  width: 0.8rem;
  height: 0.8rem;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(201, 162, 39, 0.22);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: 1.4rem;
  bottom: -1.5rem;
  left: 0.36rem;
  width: 2px;
  background: rgba(201, 162, 39, 0.4);
}

.page-about .about-timeline__item:last-child::before {
  display: none;
}

.page-about .about-timeline__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .about-timeline__item h3 {
  margin: 0.3rem 0 0.45rem;
  font-family: var(--font-display);
  font-size: 1.04rem;
  font-weight: 700;
  color: var(--ivory);
}

.page-about .about-timeline__desc {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(247, 242, 231, 0.76);
}

@media (min-width: 900px) {
  .page-about .about-timeline {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 1rem;
  }

  .page-about .about-timeline__item {
    padding-left: 0;
    padding-top: 1.85rem;
  }

  .page-about .about-timeline__node {
    top: 0.32rem;
    left: 0;
  }

  .page-about .about-timeline__item::before {
    top: 0.7rem;
    bottom: auto;
    left: 0.4rem;
    width: calc(100% + 1rem);
    height: 2px;
  }

  .page-about .about-timeline__item:last-child::before {
    display: none;
  }
}

/* ---------- 团队与流程 ---------- */
.page-about .about-team {
  display: grid;
  gap: 0.95rem;
  margin-bottom: 1.6rem;
}

.page-about .about-team__card {
  padding: 1.35rem 1.2rem 1.45rem;
  border-radius: var(--r-card);
  background: #ffffff;
  border: 1px solid var(--line);
  border-left: 4px solid var(--gold);
  box-shadow: var(--shadow-card);
}

.page-about .about-team__card h3 {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--red);
}

.page-about .about-team__card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--black);
}

.page-about .about-team__fig {
  margin: 0 0 1.75rem;
  border-radius: var(--r-card);
  overflow: hidden;
  border: 1px solid var(--line-gold);
  background: linear-gradient(150deg, var(--red-deep) 0%, var(--ink) 100%);
}

.page-about .about-team__fig img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-flow__step {
  position: relative;
  padding: 1.05rem 1.1rem 1.2rem;
  border-radius: 1.25rem;
  background: #ffffff;
  border: 1px solid var(--line-gold);
}

.page-about .about-flow__num {
  display: inline-block;
  margin-bottom: 0.55rem;
  padding: 0.12rem 0.55rem;
  border-radius: var(--r-pill);
  background: var(--gold-light);
  color: var(--red);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.page-about .about-flow__step strong {
  display: block;
  margin-bottom: 0.32rem;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--red-deep);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.65;
  color: var(--black);
}

@media (min-width: 720px) {
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.1rem;
  }

  .page-about .about-team__card:nth-child(2) {
    margin-top: 1.5rem;
  }

  .page-about .about-team__card:nth-child(3) {
    margin-top: 3rem;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .page-about .about-flow__step::after {
    content: "→";
    position: absolute;
    top: 50%;
    right: -1.375rem;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 50%;
    background: var(--ivory);
    color: var(--gold);
    font-size: 0.82rem;
    font-weight: 700;
    transform: translateY(-50%);
  }

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

/* ---------- 数据整理 ---------- */
.page-about .about-data {
  display: grid;
  gap: 1.6rem;
}

.page-about .about-data__list {
  list-style: none;
  margin: 0;
  padding: 1.15rem 1.2rem;
  border-radius: var(--r-card);
  background: var(--ink);
  color: var(--ivory);
  display: grid;
  gap: 0.9rem;
}

.page-about .about-data__list li {
  display: grid;
  gap: 0.2rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid rgba(247, 242, 231, 0.12);
}

.page-about .about-data__list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-data__list strong {
  font-family: var(--font-display);
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--gold-light);
}

.page-about .about-data__list span {
  font-size: 0.85rem;
  line-height: 1.65;
  color: rgba(247, 242, 231, 0.78);
}

@media (min-width: 860px) {
  .page-about .about-data {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 2.25rem;
    align-items: start;
  }
}

/* ---------- 内容合作 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 1.75rem;
}

.page-about .about-partners__copy p {
  margin: 0 0 1rem;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--black);
  max-width: 60ch;
}

.page-about .about-partners__cta {
  margin-top: 0.45rem;
  text-decoration: none;
}

.page-about .about-partners__fig {
  margin: 0;
  border-radius: var(--r-card);
  overflow: hidden;
  border: 1px solid var(--line-gold);
  background: linear-gradient(150deg, var(--ink-mid) 0%, var(--red-deep) 100%);
}

.page-about .about-partners__fig img {
  display: block;
  width: 100%;
  height: auto;
}

@media (min-width: 860px) {
  .page-about .about-partners {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 2.5rem;
    align-items: center;
  }
}

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