.page-about {
  --about-gap: clamp(2.75rem, 6vw, 5rem);
  --about-card-pad: clamp(1.25rem, 3vw, 1.75rem);
  background: var(--space);
  color: var(--white);
  overflow-x: clip;
}

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

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: calc(var(--header-h) + 1rem);
  font-size: var(--fs-14);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--mist);
}

.page-about .breadcrumb li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  color: rgba(154, 168, 199, 0.45);
}

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

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

.page-about .breadcrumb [aria-current="page"] {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 2rem 0 clamp(2.5rem, 6vw, 4rem);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -12% -10% 34% 24%;
  background: linear-gradient(135deg, rgba(0, 229, 199, 0.2), rgba(28, 23, 64, 0.85) 58%, rgba(7, 13, 31, 0) 84%);
  clip-path: polygon(28% 0, 100% 0, 100% 72%, 0 100%);
  z-index: 0;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 4%;
  top: 20%;
  width: 130px;
  height: 130px;
  border-radius: 50%;
  background: radial-gradient(circle at 32% 32%, rgba(255, 122, 60, 0.32), rgba(255, 122, 60, 0) 70%);
  z-index: 0;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(2rem, 5vw, 3rem);
  align-items: center;
}

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

.page-about .about-hero h1 {
  margin: 0.75rem 0 0;
  font-size: clamp(2rem, 6.5vw, var(--fs-64));
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-hero__accent {
  display: block;
  color: var(--cyan);
}

.page-about .about-hero__lead {
  margin: 1.25rem 0 0;
  max-width: 60ch;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: rgba(242, 246, 255, 0.86);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.875rem;
  margin-top: clamp(1.5rem, 4vw, 2rem);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2.25rem;
  margin: 2.25rem 0 0;
  padding: 1.5rem 0 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
  font-size: var(--fs-14);
  color: var(--mist);
}

.page-about .about-hero__num {
  display: block;
  font-size: var(--fs-28);
  line-height: 1.1;
  color: var(--orange);
  letter-spacing: -0.02em;
}

.page-about .about-hero__media {
  margin: 0;
  position: relative;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: auto 8% -10px 8%;
  height: 24px;
  background: rgba(0, 229, 199, 0.18);
  filter: blur(22px);
  z-index: -1;
}

.page-about .about-hero__media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-m);
  clip-path: polygon(0 7%, 100% 0, 100% 93%, 0 100%);
}

/* ---------- 目录 + 正文 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(2rem, 5vw, 3rem);
  padding-bottom: var(--about-gap);
}

.page-about .about-toc .eyebrow {
  color: var(--mist);
  font-size: var(--fs-12);
}

.page-about .about-toc__list {
  display: flex;
  gap: 0.5rem;
  margin: 1rem 0 0;
  padding: 0 0 0.5rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc__link {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-s);
  border-bottom: 2px solid transparent;
  color: var(--mist);
  text-decoration: none;
  font-size: var(--fs-14);
  white-space: nowrap;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-toc__link .index-list__num {
  color: var(--cyan);
  font-size: var(--fs-12);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--white);
  background: var(--zone);
  border-bottom-color: var(--cyan);
}

.page-about .about-toc .aside-note {
  margin-top: 1.5rem;
  font-size: var(--fs-14);
  line-height: 1.7;
}

.page-about .about-sec {
  padding-top: var(--about-gap);
}

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

.page-about .about-body > .about-sec + .about-sec {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-sec .section-head {
  max-width: 62ch;
}

.page-about .about-sec .section-head .eyebrow {
  color: var(--orange);
  font-size: var(--fs-12);
}

.page-about .about-sec .section-head__title {
  margin: 0.5rem 0 0;
  font-size: clamp(1.35rem, 3.6vw, var(--fs-28));
  line-height: 1.3;
  font-weight: 700;
}

.page-about .about-sec__grid {
  display: grid;
  gap: 1.5rem;
  margin-top: 1.75rem;
}

.page-about .prose p {
  color: rgba(242, 246, 255, 0.84);
  line-height: 1.85;
}

.page-about .prose p + p {
  margin-top: 1rem;
}

.page-about .about-sec .aside-note {
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--mist);
}

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

.page-about .about-timeline__item {
  position: relative;
  padding-left: 1.5rem;
  border-left: 1px solid var(--line-soft);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 0.45rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(0, 229, 199, 0.12);
}

.page-about .about-timeline__ver {
  display: block;
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--cyan);
  margin-bottom: 0.5rem;
}

.page-about .about-timeline__title {
  margin: 0;
  font-size: var(--fs-20);
  font-weight: 700;
  line-height: 1.35;
}

.page-about .about-timeline__item p {
  margin: 0.5rem 0 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--mist);
}

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

.page-about .about-figure img {
  width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border-radius: var(--radius-m);
  border: 1px solid var(--line-soft);
}

.page-about .about-figure__cap {
  display: block;
  margin-top: 0.75rem;
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ---------- 数据卡片 ---------- */
.page-about .about-stats {
  display: grid;
  gap: 1rem;
  margin-top: 1.75rem;
}

.page-about .about-stat {
  padding: var(--about-card-pad);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  background: linear-gradient(158deg, var(--zone), rgba(11, 59, 60, 0.45));
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.page-about .about-stat--teal {
  background: linear-gradient(158deg, rgba(11, 59, 60, 0.9), rgba(7, 13, 31, 0.9));
}

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

.page-about .about-stat__num {
  display: block;
  font-size: clamp(2rem, 7vw, var(--fs-40));
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .about-stat__num--orange {
  color: var(--orange);
}

.page-about .about-stat__title {
  margin: 0.5rem 0 0;
  font-size: var(--fs-16);
  font-weight: 700;
}

.page-about .about-stat__note {
  margin: 0.5rem 0 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  margin-top: 1.75rem;
}

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

.page-about .about-team__media img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-m);
  clip-path: polygon(0 0, 100% 4%, 100% 100%, 0 96%);
}

.page-about .about-team__list {
  display: grid;
  gap: 1.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__item {
  display: flex;
  gap: 0.875rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .about-team__idx {
  flex: none;
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--orange);
  padding-top: 0.3rem;
}

.page-about .about-team__title {
  margin: 0;
  font-size: var(--fs-16);
  font-weight: 700;
}

.page-about .about-team__desc {
  margin: 0.4rem 0 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  display: grid;
  gap: 1rem;
  margin-top: 1.75rem;
}

.page-about .about-eco__card {
  padding: var(--about-card-pad);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--electric);
  border-radius: var(--radius-s);
  background: rgba(14, 26, 56, 0.7);
}

.page-about .about-eco__title {
  margin: 0;
  font-size: var(--fs-16);
  font-weight: 700;
  color: var(--white);
}

.page-about .about-eco__card p {
  margin: 0.5rem 0 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-eco__link {
  margin: 1.25rem 0 0;
  font-size: var(--fs-14);
  color: var(--mist);
}

.page-about .about-eco__link a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 199, 0.35);
}

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

/* ---------- 理由 ---------- */
.page-about .about-reasons {
  display: grid;
  gap: 1rem;
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-reasons__item {
  padding: var(--about-card-pad);
  border-radius: var(--radius-m);
  background: linear-gradient(120deg, rgba(28, 23, 64, 0.7), rgba(7, 13, 31, 0.4));
  border: 1px solid var(--line-soft);
}

.page-about .about-reasons__idx {
  display: inline-block;
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--yellow);
}

.page-about .about-reasons__title {
  margin: 0.5rem 0 0;
  font-size: var(--fs-20);
  font-weight: 700;
  line-height: 1.35;
}

.page-about .about-reasons__item p {
  margin: 0.5rem 0 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 结尾 CTA ---------- */
.page-about .about-cta {
  padding: clamp(2.5rem, 6vw, 4rem) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line-soft);
  background: linear-gradient(120deg, rgba(0, 229, 199, 0.14), rgba(28, 23, 64, 0.9) 62%, rgba(7, 13, 31, 0.9));
}

.page-about .about-cta__inner {
  display: grid;
  gap: 1.75rem;
  align-items: center;
}

.page-about .about-cta__copy .eyebrow {
  color: var(--cyan);
  font-size: var(--fs-12);
}

.page-about .about-cta h2 {
  margin: 0.5rem 0 0;
  font-size: clamp(1.4rem, 4vw, var(--fs-28));
  line-height: 1.3;
  font-weight: 700;
}

.page-about .about-cta__copy p {
  margin: 0.75rem 0 0;
  max-width: 56ch;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: rgba(242, 246, 255, 0.82);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.875rem;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-stat {
    grid-column: span 2;
  }

  .page-about .about-stat--wide {
    grid-column: span 4;
  }

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

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

@media (min-width: 760px) {
  .page-about .about-timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.25rem;
    padding-top: 1.5rem;
  }

  .page-about .about-timeline::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 5px;
    height: 1px;
    background: linear-gradient(90deg, var(--cyan), rgba(79, 140, 255, 0.5) 55%, rgba(154, 168, 199, 0.14));
  }

  .page-about .about-timeline__item {
    padding-left: 0;
    border-left: 0;
    padding-right: 0.75rem;
  }

  .page-about .about-timeline__item::before {
    left: 0;
    top: 2px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  }

  .page-about .about-sec__grid {
    grid-template-columns: minmax(0, 1fr) 240px;
    gap: clamp(1.5rem, 4vw, 3rem);
    align-items: start;
  }

  .page-about .about-sec__grid--wide {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: start;
  }

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

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: 250px minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-h) + 2rem);
  }

  .page-about .about-toc__list {
    flex-direction: column;
    overflow-x: visible;
    padding-bottom: 0;
  }

  .page-about .about-toc__link {
    border-bottom: 0;
    border-left: 2px solid transparent;
    white-space: normal;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stat,
  .page-about .about-toc__link {
    transition: none;
  }
}