.page-about {
  --about-nav-w: 14rem;
  --about-measure: 46rem;
  background: var(--bg);
  color: var(--text);
  padding-top: calc(var(--header-h) + clamp(1.25rem, 3vw, 2.25rem));
  padding-bottom: clamp(2.5rem, 7vw, 4rem);
}

/* ---------- 面包屑 ---------- */
.page-about .page-about__crumbs {
  margin-bottom: clamp(1.5rem, 3.5vw, 2.5rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-bottom: clamp(2.25rem, 5vw, 3.5rem);
  border-bottom: 1px solid var(--rock-soft);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -6rem 0 auto;
  height: 18rem;
  background: radial-gradient(60% 100% at 22% 0%, rgba(47, 216, 200, 0.1), transparent 70%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 5vw, 3rem);
  align-items: center;
}

.page-about .about-hero__title {
  margin: 0.7rem 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 6.4vw, 3.5rem);
  line-height: 1.06;
  letter-spacing: 0.005em;
  color: var(--text);
}

.page-about .about-hero__lede {
  margin: 1.25rem 0 0;
  max-width: 34rem;
  color: var(--text-soft);
  font-size: clamp(0.98rem, 1.7vw, 1.1rem);
  line-height: 1.9;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.page-about .about-hero__figure {
  margin: 0;
  border: 1px solid var(--rock);
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--ink-750);
}

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

/* ---------- 层叠目录布局 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 3rem);
  padding-top: clamp(2.5rem, 7vw, 4.5rem);
  padding-bottom: clamp(2.5rem, 7vw, 4rem);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  position: relative;
}

.page-about .about-index__title {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.page-about .about-index__list {
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0 0 0.35rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.9rem;
  border: 1px solid var(--rock);
  border-radius: var(--pill);
  color: var(--text-soft);
  font-size: 0.84rem;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: color 200ms var(--ease), border-color 200ms var(--ease), background-color 200ms var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  outline: none;
}

.page-about .about-index__num {
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

/* ---------- 正文单列 ---------- */
.page-about .about-main {
  max-width: var(--about-measure);
  width: 100%;
}

.page-about .about-block {
  padding-block: clamp(2.25rem, 5.5vw, 3.5rem);
  border-top: 1px solid var(--rock-soft);
  scroll-margin-top: calc(var(--header-h-shrink) + 1.75rem);
}

.page-about .about-main > .about-block:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-block__head {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin: 0 0 1.5rem;
}

.page-about .about-block__num {
  flex: none;
  padding: 0.18rem 0.5rem;
  border: 1px solid var(--rock);
  border-radius: var(--pill);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-block__title {
  flex: none;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 3.6vw, 2rem);
  line-height: 1.15;
  letter-spacing: 0.01em;
  color: var(--text);
}

.page-about .about-block__rule {
  flex: 1 1 auto;
  min-width: 1.5rem;
  height: 1px;
  background: linear-gradient(90deg, var(--rock), transparent);
}

.page-about .about-prose p {
  margin: 0 0 1.1rem;
  color: var(--text-soft);
  font-size: 1rem;
  line-height: 1.95;
}

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

.page-about .about-more {
  margin: 1.5rem 0 0;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-block .link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 216, 200, 0.35);
  transition: border-color 200ms var(--ease), color 200ms var(--ease);
}

.page-about .about-block .link:hover,
.page-about .about-block .link:focus-visible {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan-soft);
}

/* ---------- 场景 ---------- */
.page-about .about-scenes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.7rem;
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-scenes__item {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 0.95rem 1.1rem;
  border: 1px solid var(--rock);
  border-radius: var(--radius-md);
  background: var(--ink-750);
  transition: border-color 220ms var(--ease);
}

.page-about .about-scenes__item:hover {
  border-color: var(--cyan);
}

.page-about .about-scenes__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-scenes__desc {
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--text-dim);
}

/* ---------- 复核节奏刻度 ---------- */
.page-about .about-grade {
  display: block;
  width: 100%;
  max-width: 20rem;
  height: auto;
  margin: 1.75rem 0 0.5rem;
}

.page-about .about-review {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.1rem;
  margin: 1.25rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-review__item {
  position: relative;
  padding: 1.15rem 1.2rem 1.2rem;
  border: 1px solid var(--rock);
  border-radius: var(--radius-md);
  background: var(--ink-750);
  transition: border-color 220ms var(--ease), transform 220ms var(--ease);
}

.page-about .about-review__item:hover {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .about-review__mark {
  display: block;
  width: 1.6rem;
  height: 3px;
  border-radius: var(--pill);
  background: var(--cyan);
  margin-bottom: 0.85rem;
}

.page-about .about-review__title {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.08rem;
  line-height: 1.3;
  color: var(--text);
}

.page-about .about-review__text {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 时间线 ---------- */
.page-about .about-pace__figure {
  margin: 1.75rem 0 2rem;
  border: 1px solid var(--rock);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink-750);
}

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

.page-about .about-timeline__track {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.6rem;
  border-left: 1px solid var(--rock);
  padding-left: 1.35rem;
}

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

.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  left: calc(-1.35rem - 4.5px);
  top: 0.5rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-800);
  border: 1px solid var(--cyan);
  transition: background-color 220ms var(--ease), box-shadow 220ms var(--ease);
}

.page-about .about-timeline__node:hover::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(47, 216, 200, 0.16);
}

.page-about .about-timeline__phase {
  margin: 0 0 0.3rem;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-timeline__title {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.12rem;
  line-height: 1.3;
  color: var(--text);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.85;
  color: var(--text-dim);
  transition: color 220ms var(--ease);
}

.page-about .about-timeline__node:hover .about-timeline__text {
  color: var(--text-soft);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: start;
}

.page-about .about-team__figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--rock);
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--ink-750);
}

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

.page-about .about-team__lead {
  margin: 0 0 1.5rem;
  color: var(--text-soft);
  font-size: 1rem;
  line-height: 1.9;
}

.page-about .about-crews {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-crews__item {
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr);
  gap: 0.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rock-soft);
}

.page-about .about-crews__no {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
  padding-top: 0.15rem;
}

.page-about .about-crews__name {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1.3;
  color: var(--text);
}

.page-about .about-crews__text p {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.85;
  color: var(--text-dim);
}

/* ---------- 规模数字 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.6rem, 4vw, 2.5rem);
  margin: 0.5rem 0 1.75rem;
}

.page-about .about-stat {
  padding-top: 1.1rem;
  border-top: 1px solid var(--rock);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(3.2rem, 12vw, 5.4rem);
  line-height: 0.88;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .about-stat__suffix {
  font-size: 0.42em;
  margin-left: 0.12em;
  color: var(--cyan-soft);
}

.page-about .about-stat__unit {
  display: block;
  margin-top: 0.6rem;
  font-size: 0.95rem;
  color: var(--text);
}

.page-about .about-stat__desc {
  margin: 0.45rem 0 0;
  font-size: 0.87rem;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 季度报告 ---------- */
.page-about .about-report {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.9rem;
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-report__item {
  padding: 1.1rem 1.2rem;
  border: 1px solid var(--rock);
  border-radius: var(--radius-md);
  background: var(--ink-750);
  transition: border-color 220ms var(--ease);
}

.page-about .about-report__item:hover {
  border-color: var(--cyan);
}

.page-about .about-report__title {
  margin: 0.7rem 0 0.4rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.08rem;
  line-height: 1.3;
  color: var(--text);
}

.page-about .about-report__text {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 收尾行动 ---------- */
.page-about .about-cta {
  margin-top: clamp(1.5rem, 5vw, 3rem);
  padding: clamp(1.6rem, 4vw, 2.5rem);
  border: 1px solid var(--rock);
  border-radius: var(--radius-xl);
  background: linear-gradient(140deg, var(--ink-750), var(--ink-900));
}

.page-about .about-cta__title {
  margin: 0 0 0.7rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.35rem, 3.4vw, 1.85rem);
  line-height: 1.2;
  color: var(--text);
}

.page-about .about-cta__text {
  margin: 0 0 1.5rem;
  max-width: 34rem;
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--text-soft);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- 小屏以上的栅格 ---------- */
@media (min-width: 560px) {
  .page-about .about-scenes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 720px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: clamp(1.75rem, 4vw, 3rem);
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    gap: clamp(2.5rem, 5vw, 4.5rem);
  }

  .page-about .about-timeline__track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.5rem;
    border-left: 0;
    border-top: 1px solid var(--rock);
    padding-left: 0;
    padding-top: 2rem;
  }

  .page-about .about-timeline__node::before {
    left: 0;
    top: calc(-2rem - 4.5px);
  }

  .page-about .about-timeline__node:hover::before {
    box-shadow: 0 0 0 4px rgba(47, 216, 200, 0.16);
  }
}

/* ---------- 桌面：左侧竖排粘性索引 ---------- */
@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-nav-w) minmax(0, 1fr);
    gap: clamp(2.5rem, 6vw, 5.5rem);
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h-shrink) + 2.25rem);
    align-self: start;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 0.1rem;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-index__link {
    display: grid;
    grid-template-columns: 2.1rem minmax(0, 1fr);
    align-items: baseline;
    gap: 0.2rem;
    padding: 0.62rem 0.5rem 0.62rem 0.85rem;
    border: 0;
    border-left: 1px solid var(--rock);
    border-radius: 0;
    white-space: normal;
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--text-dim);
    background: transparent;
    transition: color 200ms var(--ease), border-color 200ms var(--ease), background-color 200ms var(--ease);
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    border-left-color: var(--cyan);
    color: var(--text);
    background: rgba(47, 216, 200, 0.05);
  }

  .page-about .about-index__num {
    color: var(--text-dim);
    transition: color 200ms var(--ease);
  }

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

/* 通过锚点定位标记当前章节 */
.page-about:has(#serve:target) .about-index__link[href="#serve"],
.page-about:has(#review:target) .about-index__link[href="#review"],
.page-about:has(#pace:target) .about-index__link[href="#pace"],
.page-about:has(#team:target) .about-index__link[href="#team"],
.page-about:has(#scale:target) .about-index__link[href="#scale"],
.page-about:has(#report:target) .about-index__link[href="#report"] {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(47, 216, 200, 0.08);
}

.page-about:has(#serve:target) .about-index__link[href="#serve"] .about-index__num,
.page-about:has(#review:target) .about-index__link[href="#review"] .about-index__num,
.page-about:has(#pace:target) .about-index__link[href="#pace"] .about-index__num,
.page-about:has(#team:target) .about-index__link[href="#team"] .about-index__num,
.page-about:has(#scale:target) .about-index__link[href="#scale"] .about-index__num,
.page-about:has(#report:target) .about-index__link[href="#report"] .about-index__num {
  color: var(--cyan);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-review__item,
  .page-about .about-timeline__text,
  .page-about .about-timeline__node::before,
  .page-about .about-index__link {
    transition: none;
  }

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