.page-about {
  --about-hairline: rgba(62, 242, 224, 0.18);
  --about-sand-muted: rgba(26, 21, 18, 0.72);
  --about-sand-accent: #A6531F;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  padding-top: clamp(1rem, 3vw, 1.7rem);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--fg-muted);
}

.page-about .breadcrumbs__link {
  color: var(--mist);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease);
}

.page-about .breadcrumbs__link:hover,
.page-about .breadcrumbs__link:focus-visible {
  color: var(--cyan);
}

.page-about .breadcrumbs__sep {
  color: var(--edge);
}

.page-about .breadcrumbs__current {
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding-block: clamp(1.2rem, 4vw, 2.4rem) clamp(2.2rem, 5vw, 3.6rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(118deg, rgba(13, 27, 46, 0.96) 0%, rgba(13, 27, 46, 0.42) 52%, rgba(7, 17, 31, 0) 78%),
    radial-gradient(120% 90% at 100% 0%, rgba(62, 242, 224, 0.12) 0%, rgba(7, 17, 31, 0) 58%);
  clip-path: polygon(0 0, 100% 0, 100% 80%, 0 100%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .about-hero h1 {
  margin: 0.5rem 0 0;
  font-size: clamp(2.1rem, 6vw, 4.2rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: #F2F7FC;
  text-wrap: balance;
}

.page-about .about-hero__intro {
  margin: 1.1rem 0 0;
  max-width: 52ch;
  font-size: clamp(0.98rem, 1.6vw, 1.08rem);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.6rem;
}

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

/* ---------- 通用 figure ---------- */
.page-about .figure__media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  background: var(--slate);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.04);
}

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

.page-about .figure__media--wide {
  aspect-ratio: 16 / 9;
}

.page-about .figure__caption {
  margin-top: 0.7rem;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--fg-muted);
  border-left: 1px solid var(--about-hairline);
  padding-left: 0.7rem;
}

/* ---------- 章节导读 ---------- */
.page-about .about-index {
  border-block: 1px solid var(--edge);
  background: rgba(13, 27, 46, 0.6);
}

.page-about .about-index__inner {
  display: flex;
  align-items: center;
  gap: clamp(0.8rem, 2vw, 1.6rem);
  padding-block: 0.65rem;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-index__label {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .about-index__list {
  display: flex;
  gap: clamp(0.9rem, 2.6vw, 2rem);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  padding-bottom: 0.15rem;
  border-bottom: 1px solid transparent;
  color: var(--mist);
  font-size: 0.85rem;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--edge);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding-block: clamp(2.4rem, 6vw, 4.6rem);
}

.page-about .about-head {
  display: grid;
  gap: 0.55rem;
  margin-bottom: clamp(1.3rem, 3vw, 2.2rem);
}

.page-about .about-section h2,
.page-about .about-next h2,
.page-about .about-service h2 {
  margin: 0;
  font-size: clamp(1.5rem, 3.2vw, 2.3rem);
  line-height: 1.16;
  letter-spacing: -0.015em;
  font-weight: 800;
  color: #EFF6FD;
  text-wrap: balance;
}

/* ---------- 01 起点 ---------- */
.page-about .about-lead-row {
  display: grid;
  gap: clamp(1rem, 2.4vw, 1.6rem);
}

.page-about .about-lead-row__big {
  margin: 0;
  font-size: clamp(1.02rem, 1.7vw, 1.18rem);
  line-height: 1.85;
  color: #DCE7F2;
}

.page-about .about-lead-row__aside {
  margin: 0;
  padding-left: 1rem;
  border-left: 1px solid var(--about-hairline);
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-timeline {
  margin: clamp(1.8rem, 4vw, 2.8rem) 0 0;
  padding: 0 0 0.9rem;
  list-style: none;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(215px, 80%);
  gap: clamp(0.9rem, 2vw, 1.4rem);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
}

.page-about .about-timeline__item {
  position: relative;
  scroll-snap-align: start;
  padding-top: 1.05rem;
  border-top: 1px solid var(--edge);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px var(--ink);
}

.page-about .about-timeline__item--now::before {
  background: var(--orange);
}

.page-about .about-timeline__year {
  margin: 0 0 0.35rem;
  font-family: var(--font-mono);
  font-size: 1.08rem;
  letter-spacing: 0.05em;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .about-timeline__item--now .about-timeline__year {
  color: var(--orange);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 02 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(1.4rem, 3vw, 2.2rem);
}

.page-about .about-team__body p {
  margin: 0 0 0.9rem;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--mist);
}

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

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

.page-about .about-team__figure .figure__media {
  aspect-ratio: 3 / 2;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stats li {
  padding-top: 0.7rem;
  border-top: 1px solid var(--about-hairline);
}

.page-about .about-stats b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.28rem, 2.6vw, 1.7rem);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .about-stats span {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--fg-muted);
}

/* ---------- 03 节奏 ---------- */
.page-about .about-rhythm {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rhythm__row {
  display: grid;
  gap: 0.4rem;
  padding-block: clamp(1rem, 2.2vw, 1.35rem);
  border-top: 1px solid var(--edge);
}

.page-about .about-rhythm__row:last-child {
  border-bottom: 1px solid var(--edge);
}

.page-about .about-rhythm__cadence {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .about-rhythm__text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: #DCE7F2;
}

/* ---------- 04 协作 ---------- */
.page-about .about-network__grid {
  display: grid;
  gap: clamp(1.4rem, 3vw, 2.4rem);
}

.page-about .about-network__body p {
  margin: 0 0 0.9rem;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--mist);
}

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

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

.page-about .about-network__figure .figure__media {
  aspect-ratio: 12 / 7;
}

/* ---------- 05 暖沙区块 ---------- */
.page-about .about-service {
  padding-block: clamp(2.6rem, 6vw, 4.8rem);
  border-top: 1px solid var(--edge);
}

.page-about .about-service h2 {
  color: var(--umber);
}

.page-about .about-service .eyebrow {
  color: var(--about-sand-accent);
}

.page-about .about-service__lead {
  margin: 0 0 clamp(1.4rem, 3vw, 2rem);
  max-width: 62ch;
  font-size: clamp(1rem, 1.5vw, 1.1rem);
  line-height: 1.85;
  color: var(--about-sand-muted);
}

.page-about .about-scenarios {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1rem, 2vw, 1.5rem);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-scenarios__item {
  padding-top: 0.85rem;
  border-top: 1px solid rgba(26, 21, 18, 0.24);
}

.page-about .about-scenarios__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--about-sand-accent);
}

.page-about .about-scenarios__title {
  margin: 0.35rem 0 0.35rem;
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--umber);
}

.page-about .about-scenarios__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--about-sand-muted);
}

.page-about .about-service__note {
  margin: clamp(1.4rem, 3vw, 2rem) 0 0;
  padding-top: 1rem;
  border-top: 1px solid rgba(26, 21, 18, 0.24);
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--about-sand-muted);
}

/* ---------- 后续入口 ---------- */
.page-about .about-next {
  padding-block: clamp(2.4rem, 5vw, 4rem);
  border-top: 1px solid var(--edge);
}

.page-about .about-next__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-next__list li {
  border-bottom: 1px solid var(--edge);
}

.page-about .about-next__list a {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.25rem 1rem;
  padding-block: 1rem;
  color: var(--fg);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease);
}

.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  color: var(--cyan);
}

.page-about .about-next__list strong {
  font-size: 1.02rem;
  font-weight: 700;
}

.page-about .about-next__list span {
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 桌面增强 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4.4fr);
    align-items: end;
    column-gap: clamp(1.6rem, 3vw, 3rem);
  }

  .page-about .about-hero__figure {
    transform: translateY(0.6rem);
  }

  .page-about .about-index__label {
    font-size: 0.72rem;
  }

  .page-about .about-lead-row {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
    column-gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-about .about-lead-row__aside {
    margin-top: 0.3rem;
  }

  .page-about .about-timeline {
    grid-auto-columns: minmax(0, 1fr);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    grid-template-areas:
      "body figure"
      "stats figure";
    align-items: start;
    column-gap: clamp(2rem, 4vw, 3.4rem);
  }

  .page-about .about-team__body {
    grid-area: body;
  }

  .page-about .about-team__figure {
    grid-area: figure;
  }

  .page-about .about-stats {
    grid-area: stats;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 0.6rem;
  }

  .page-about .about-rhythm__row {
    grid-template-columns: 9rem minmax(0, 1fr);
    align-items: baseline;
    column-gap: 1.5rem;
  }

  .page-about .about-network__grid {
    grid-template-columns: minmax(0, 5.6fr) minmax(0, 5fr);
    align-items: start;
    column-gap: clamp(2rem, 4vw, 3.4rem);
  }

  .page-about .about-network__figure {
    transform: translateY(1.2rem);
  }

  .page-about .about-scenarios {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(1.2rem, 2.4vw, 1.8rem);
  }

  .page-about .about-next__list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(1.8rem, 3vw, 2.8rem);
  }
}

@media (min-width: 1100px) {
  .page-about .about-scenarios {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline {
    scroll-behavior: auto;
  }

  .page-about .about-hero__figure,
  .page-about .about-network__figure {
    transform: none;
  }
}