.page-about {
  --about-grid-gap: clamp(1rem, 2.5vw, 2rem);
  --about-edge: rgba(126, 166, 255, 0.14);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(4.5rem, 11vh, 7.5rem) 0 clamp(2.5rem, 6vh, 4rem);
  border-bottom: 1px solid var(--line-glass);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -12%;
  right: -25%;
  width: 78%;
  height: 135%;
  background: linear-gradient(140deg, rgba(47, 107, 255, 0.34), rgba(155, 92, 255, 0.16) 46%, transparent 72%);
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 66%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 7, 13, 0.5) 0%, rgba(5, 7, 13, 0.9) 62%, var(--ink) 100%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(0.9rem, 2vh, 1.4rem);
}

.page-about .about-hero__inner .breadcrumb {
  margin-bottom: clamp(0.5rem, 2vh, 1.2rem);
}

.page-about .about-hero__inner .h-display {
  margin: 0;
  max-width: 18ch;
}

.page-about .about-hero__inner .lede {
  max-width: 62ch;
}

/* 首屏数据条 */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(1.5rem, 4vh, 2.75rem);
  background: var(--line-glass);
  border: 1px solid var(--line-glass);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-stat {
  display: grid;
  gap: 0.35rem;
  padding: clamp(0.9rem, 2.4vw, 1.4rem);
  background: linear-gradient(160deg, rgba(11, 18, 32, 0.94), rgba(5, 7, 13, 0.94));
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4.2vw, 2.35rem);
  line-height: 1;
  color: var(--text);
  letter-spacing: -0.01em;
}

.page-about .about-stat__num em {
  font-style: normal;
  color: var(--arc);
}

.page-about .about-stat__label {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--text-2);
}

/* ---------- 通用章节骨架 ---------- */
.page-about .about-section {
  padding-block: var(--pad-section);
}

.page-about .about-section--panel {
  background: linear-gradient(180deg, var(--panel) 0%, rgba(11, 18, 32, 0.55) 100%);
  border-block: 1px solid var(--line-glass);
}

.page-about .about-section--accent {
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(47, 107, 255, 0.16), transparent 60%),
    var(--ink);
}

.page-about .about-section__grid {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-section__head {
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
}

.page-about .about-section__index {
  font-family: var(--font-mono);
  font-size: clamp(2.1rem, 6vw, 4.4rem);
  line-height: 0.85;
  letter-spacing: 0.03em;
  color: rgba(47, 107, 255, 0.16);
  -webkit-text-stroke: 1px rgba(126, 166, 255, 0.6);
}

.page-about .about-section__note {
  margin: 0;
  font-family: var(--font-label);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-3);
}

.page-about .about-section__body {
  display: grid;
  gap: clamp(1rem, 2.5vw, 1.6rem);
  min-width: 0;
}

.page-about .about-section__body .h-section {
  margin: 0;
  max-width: 20ch;
}

.page-about .about-section__body .lede {
  margin: 0;
  color: var(--text-2);
}

.page-about .about-section__body .prose p {
  color: var(--text-2);
}

.page-about .about-section__body .prose a {
  color: var(--arc-soft);
}

/* ---------- 表格 ---------- */
.page-about .about-table-caption {
  text-align: left;
  padding-bottom: 0.75rem;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--text-3);
}

.page-about .table tbody th {
  text-align: left;
  white-space: nowrap;
}

.page-about .table td,
.page-about .table th {
  border-color: var(--line-glass);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: var(--about-grid-gap);
}

.page-about .about-team__card {
  display: grid;
  gap: 0.55rem;
  padding: clamp(1.1rem, 3vw, 1.6rem);
}

.page-about .about-team__role {
  margin: 0;
  font-family: var(--font-label);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  color: var(--arc-soft);
}

.page-about .about-team__card h3 {
  margin: 0;
  font-size: 1.15rem;
  color: var(--text);
}

.page-about .about-team__card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--text-2);
}

.page-about .about-team__card a {
  color: var(--arc-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-team__media img,
.page-about .about-partners__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
}

.page-about .about-team__media,
.page-about .about-partners__media {
  margin: 0;
  position: relative;
  border: 1px solid var(--line-glass);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel);
}

.page-about .about-team__media .media__caption,
.page-about .about-partners__media .media__caption {
  display: block;
  padding: 0.7rem clamp(0.9rem, 2vw, 1.2rem);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--text-3);
  background: rgba(5, 7, 13, 0.85);
}

/* ---------- 年表 ---------- */
.page-about .about-track {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
  margin-top: 0.5rem;
}

.page-about .about-track .rail {
  position: static;
}

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

.page-about .about-track .rail__item {
  margin: 0;
}

.page-about .about-track .rail__link {
  display: block;
  padding: 0.5rem 0.8rem;
  border-left: 2px solid var(--line-grid);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-decoration: none;
  color: var(--text-2);
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-track .rail__link:hover,
.page-about .about-track .rail__link:focus-visible {
  color: var(--text);
  border-left-color: var(--arc);
  background: linear-gradient(90deg, rgba(47, 107, 255, 0.18), transparent);
}

.page-about .about-timeline {
  display: grid;
  gap: clamp(0.85rem, 2vw, 1.2rem);
  min-width: 0;
}

.page-about .about-milestone {
  padding: clamp(1.1rem, 3vw, 1.7rem);
  border: 1px solid var(--line-glass);
  border-left: 3px solid var(--arc);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: linear-gradient(100deg, rgba(47, 107, 255, 0.12), rgba(11, 18, 32, 0.9) 55%);
  display: grid;
  gap: 0.5rem;
}

.page-about .about-milestone__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3.2vw, 1.95rem);
  line-height: 1;
  color: var(--arc-soft);
  letter-spacing: 0.02em;
}

.page-about .about-milestone h3 {
  margin: 0;
  font-size: clamp(1.05rem, 2.4vw, 1.3rem);
  color: var(--text);
}

.page-about .about-milestone p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--text-2);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  gap: var(--about-grid-gap);
}

.page-about .about-partner {
  display: grid;
  gap: 0.45rem;
  padding: clamp(1.1rem, 3vw, 1.6rem);
  border-top: 2px solid var(--arc);
}

.page-about .about-partner__num {
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 4.5vw, 2.6rem);
  line-height: 1;
  color: var(--text);
}

.page-about .about-partner h3 {
  margin: 0;
  font-size: 1.05rem;
  color: var(--text);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text-2);
}

/* ---------- 为什么选我们 ---------- */
.page-about .about-why {
  display: grid;
  gap: clamp(1rem, 2.5vw, 1.5rem);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-why__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(0.8rem, 2.5vw, 1.4rem);
  align-items: start;
  padding-bottom: clamp(0.9rem, 2.5vw, 1.4rem);
  border-bottom: 1px solid var(--line-glass);
}

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

.page-about .about-why__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.5vw, 2.1rem);
  line-height: 1;
  color: var(--arc);
}

.page-about .about-why__item h3 {
  margin: 0 0 0.4rem;
  font-size: 1.08rem;
  color: var(--text);
}

.page-about .about-why__item p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--text-2);
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  padding-block: clamp(3rem, 8vh, 5.5rem);
  border-top: 1px solid var(--line-glass);
  background:
    linear-gradient(135deg, rgba(155, 92, 255, 0.12), transparent 55%),
    linear-gradient(315deg, rgba(0, 194, 255, 0.1), transparent 50%),
    var(--panel);
}

.page-about .about-cta__inner {
  display: grid;
  gap: clamp(0.9rem, 2.5vh, 1.4rem);
}

.page-about .about-cta__inner .h-section {
  margin: 0;
  max-width: 18ch;
}

.page-about .about-cta__inner .lede {
  margin: 0;
  color: var(--text-2);
  max-width: 60ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-section__note {
    writing-mode: vertical-rl;
    margin-top: 0.4rem;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-section__grid {
    grid-template-columns: clamp(7rem, 10vw, 9.5rem) minmax(0, 1fr);
    gap: clamp(1.5rem, 4vw, 3.5rem);
  }

  .page-about .about-section__head {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.1rem;
  }

  .page-about .about-track {
    grid-template-columns: clamp(6rem, 8vw, 8rem) minmax(0, 1fr);
  }

  .page-about .about-track .rail {
    position: sticky;
    top: var(--rail-top);
    align-self: start;
  }

  .page-about .about-track .rail__list {
    flex-direction: column;
    gap: 0.1rem;
  }

  .page-about .about-track .rail__link {
    padding: 0.75rem 0.6rem 0.75rem 0.9rem;
    border-left: 2px solid var(--line-grid);
  }

  .page-about .about-partners__media {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1140px) {
  .page-about .about-hero__inner > .lede {
    max-width: 58ch;
  }

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

  .page-about .about-team__media {
    grid-column: 1 / -1;
  }

  .page-about .about-why {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-about .about-why__item:nth-last-child(-n + 2) {
    border-bottom: 0;
    padding-bottom: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-track .rail__link {
    transition: none;
  }
}