.page-about {
  background: var(--ink);
  color: var(--paper);
  overflow-wrap: break-word;
}

/* ---------- 首屏 ---------- */
.page-about .about-open {
  position: relative;
  overflow: hidden;
  padding: 26px 0 44px;
  border-bottom: 1px solid var(--wire);
  background:
    radial-gradient(120% 92% at 86% 0%, rgba(34, 211, 224, 0.10), transparent 58%),
    radial-gradient(90% 70% at 6% 100%, rgba(242, 169, 59, 0.07), transparent 62%),
    var(--ink);
}

.page-about .about-open::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    repeating-linear-gradient(to right, rgba(31, 74, 99, 0.42) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(to bottom, rgba(31, 74, 99, 0.32) 0 1px, transparent 1px 72px);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.95), rgba(0, 0, 0, 0) 88%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.95), rgba(0, 0, 0, 0) 88%);
}

.page-about .about-open__inner {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 22px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

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

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  text-decoration: underline;
}

.page-about .breadcrumb span {
  color: var(--muted);
}

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

.page-about .about-open h1 {
  margin: 14px 0 0;
  max-width: 17em;
  font-size: clamp(27px, 6.8vw, 52px);
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-open .lede {
  margin: 18px 0 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-open__meta {
  margin-top: 22px;
  gap: 8px;
}

/* ---------- 数据条 ---------- */
.page-about .stat-strip {
  margin-top: 30px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--wire);
  background: var(--wire);
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 14px 18px;
  background: var(--panel);
  min-width: 0;
}

.page-about .stat__num {
  font-family: var(--font-mono);
  font-size: 23px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .stat__label {
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 区块骨架 ---------- */
.page-about .about-sec {
  position: relative;
  padding: 50px 0;
}

.page-about .about-sec + .about-sec {
  border-top: 1px solid rgba(31, 74, 99, 0.5);
}

.page-about .about-sec--dark {
  background: var(--ink);
}

.page-about .about-sec--paper {
  background: var(--paper);
  color: var(--black);
  border-top-color: rgba(31, 74, 99, 0.3);
}

.page-about .sec-head {
  max-width: 44em;
}

.page-about .sec-head h2 {
  margin: 12px 0 0;
  font-size: clamp(21px, 4.6vw, 33px);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .sec-head__note {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-sec--paper .sec-head h2 {
  color: var(--black);
}

.page-about .about-sec--paper .sec-head__note {
  color: rgba(26, 31, 38, 0.66);
}

.page-about .about-sec--paper .eyebrow {
  color: rgba(26, 31, 38, 0.55);
}

.page-about .body-copy p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

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

.page-about .about-sec--paper .body-copy p {
  color: rgba(26, 31, 38, 0.78);
}

/* ---------- 起点 ---------- */
.page-about .about-why__grid {
  margin-top: 30px;
  display: grid;
  gap: 28px;
}

.page-about .about-why__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--wire);
}

.page-about .about-why__list li {
  position: relative;
  padding: 16px 0 16px 40px;
  border-bottom: 1px solid rgba(31, 74, 99, 0.55);
}

.page-about .about-why__idx {
  position: absolute;
  left: 0;
  top: 19px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ember);
}

.page-about .about-why__list strong {
  display: block;
  margin-bottom: 4px;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-why__desc {
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 时间线 ---------- */
.page-about .about-figure {
  margin: 30px 0 0;
  border: 1px solid var(--wire);
  background: var(--panel);
}

.page-about .about-figure img,
.page-about .team-grid__figure img,
.page-about .coverage-grid__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .timeline {
  position: relative;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--wire) 34%, var(--wire) 78%, rgba(31, 74, 99, 0));
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 30px 34px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  box-sizing: border-box;
  background: var(--ink);
  border: 2px solid var(--ember);
}

.page-about .timeline__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--ember);
}

.page-about .timeline__item h3 {
  margin: 8px 0 0;
  font-size: 17px;
  line-height: 1.45;
  font-weight: 700;
  color: var(--paper);
}

.page-about .timeline__text {
  margin: 8px 0 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 索引三层 ---------- */
.page-about .layers {
  margin-top: 30px;
  display: grid;
  gap: 12px;
}

.page-about .layer {
  position: relative;
  padding: 20px 18px 22px;
  border: 1px solid rgba(11, 27, 43, 0.16);
  box-shadow: 0 2px 0 rgba(11, 27, 43, 0.1);
}

.page-about .layer--a {
  background: var(--panel);
  color: var(--paper);
}

.page-about .layer--b {
  background: var(--rail);
  color: var(--paper);
}

.page-about .layer--c {
  background: var(--wire);
  color: var(--paper);
}

.page-about .layer__tag {
  display: inline-block;
  padding: 3px 9px;
  border: 1px solid rgba(34, 211, 224, 0.42);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .layer h3 {
  margin: 14px 0 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .layer p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .design-notes {
  margin-top: 30px;
  display: grid;
  gap: 20px;
}

.page-about .design-note {
  padding-top: 14px;
  border-top: 2px solid var(--wire);
}

.page-about .design-note h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--black);
}

.page-about .design-note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(26, 31, 38, 0.78);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 28px;
}

.page-about .team-grid__more {
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .team-grid__more a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .team-facts {
  margin: 22px 0 0;
  border-top: 1px solid var(--wire);
}

.page-about .team-fact {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  padding: 13px 0;
  border-bottom: 1px solid rgba(31, 74, 99, 0.5);
}

.page-about .team-fact dt {
  flex: 0 0 auto;
  min-width: 84px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--cyan);
}

.page-about .team-fact dd {
  flex: 1 1 180px;
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .team-grid__figure {
  margin: 0;
  border: 1px solid var(--wire);
  background: var(--panel);
}

/* ---------- 服务覆盖 ---------- */
.page-about .coverage-grid {
  margin-top: 28px;
  display: grid;
  gap: 26px;
}

.page-about .coverage-grid__figure {
  margin: 0;
  border: 1px solid var(--wire);
  background: var(--panel);
}

/* ---------- 合作生态 ---------- */
.page-about .eco-grid {
  margin-top: 30px;
  display: grid;
  gap: 14px;
}

.page-about .eco-card {
  position: relative;
  padding: 24px 20px 24px;
  border: 1px solid var(--wire);
  background: var(--panel);
}

.page-about .eco-card::after {
  content: "";
  position: absolute;
  left: 20px;
  right: 20px;
  top: 0;
  height: 2px;
  background: var(--amber);
  opacity: 0.85;
}

.page-about .eco-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--amber);
}

.page-about .eco-card h3 {
  margin: 14px 0 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .eco-card p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  padding: 44px 0 52px;
  border-top: 1px solid var(--wire);
  background:
    linear-gradient(118deg, rgba(34, 211, 224, 0.10), transparent 56%),
    var(--panel);
}

.page-about .about-cta h2 {
  margin: 0;
  font-size: clamp(20px, 4.2vw, 28px);
  line-height: 1.3;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-cta p {
  margin: 14px 0 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-cta__links {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 显现动效 ---------- */
.page-about .reveal-init {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}

.page-about .reveal-init.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-open {
    padding: 34px 0 54px;
  }

  .page-about .about-open .lede {
    font-size: 16px;
  }

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

  .page-about .stat__num {
    font-size: 26px;
  }

  .page-about .about-sec {
    padding: 64px 0;
  }

  .page-about .eco-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
    background: var(--wire);
    border: 1px solid var(--wire);
  }

  .page-about .eco-card {
    border: 0;
  }

  .page-about .design-notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 32px;
  }

  .page-about .layers {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
    background: rgba(11, 27, 43, 0.14);
    border: 1px solid rgba(11, 27, 43, 0.14);
  }

  .page-about .layer {
    border: 0;
    box-shadow: none;
  }
}

@media (min-width: 900px) {
  .page-about .about-open {
    padding: 40px 0 62px;
  }

  .page-about .stat-strip {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    margin-top: 36px;
  }

  .page-about .about-sec {
    padding: 78px 0;
  }

  .page-about .about-why__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-figure {
    margin-top: 38px;
  }

  .page-about .timeline {
    margin-top: 44px;
  }

  .page-about .timeline__item {
    padding-bottom: 40px;
  }

  .page-about .timeline__item h3 {
    font-size: 19px;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .coverage-grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: 46px;
    align-items: center;
  }

  .page-about .coverage-grid__figure {
    order: -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .reveal-init {
    opacity: 1;
    transform: none;
    transition: none;
  }
}