.page-about {
  --about-gap: clamp(52px, 7vw, 108px);
  --about-card: rgba(27, 42, 94, 0.5);
  position: relative;
  color: var(--mist);
  background:
    radial-gradient(circle at 78% -6%, rgba(34, 230, 210, 0.13), transparent 58%),
    radial-gradient(circle at 6% 42%, rgba(255, 122, 26, 0.07), transparent 46%),
    linear-gradient(180deg, #0B1230 0%, #0A1029 52%, #0B1230 100%);
  overflow-x: clip;
}

.page-about .section {
  padding-block: var(--about-gap);
}

.page-about .about-head {
  max-width: 720px;
  margin-bottom: clamp(26px, 4vw, 46px);
}

.page-about .about-head .section-title {
  margin: 10px 0 14px;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(1.6rem, 3.8vw, 2.5rem);
  line-height: 1.16;
  letter-spacing: -0.035em;
  color: var(--mist);
}

.page-about .about-head .section-lede {
  margin: 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--warm-gray);
}

.page-about .breadcrumbs {
  margin-bottom: 18px;
  font-size: 0.8rem;
  color: var(--slate);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: calc(var(--header-h) + clamp(30px, 7vw, 84px));
  padding-bottom: clamp(44px, 7vw, 92px);
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(28px, 5vw, 54px);
  align-items: end;
}

.page-about .about-hero-title {
  margin: 14px 0 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(2rem, 6.6vw, 4rem);
  line-height: 1.1;
  letter-spacing: -0.045em;
  color: var(--mist);
}

.page-about .about-hero-lede {
  margin: 20px 0 0;
  max-width: 58ch;
  font-size: clamp(0.98rem, 1.8vw, 1.1rem);
  line-height: 1.9;
  color: var(--warm-gray);
}

.page-about .about-hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
  margin: 30px 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-hero-facts li {
  display: flex;
  align-items: baseline;
  gap: 7px;
}

.page-about .about-fact-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-fact-label {
  font-size: 0.86rem;
  color: var(--slate);
}

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

.page-about .about-hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.06);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), calc(100% - 34px) 100%, 0 100%);
}

.page-about .about-hero-visual::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 42px;
  width: 44%;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), transparent);
  opacity: 0.7;
}

.page-about .about-hero-visual .media-caption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate);
}

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

.page-about .tl-item {
  display: grid;
  gap: 10px;
  padding: clamp(22px, 3vw, 34px) 0;
  border-top: 1px solid var(--line);
}

.page-about .tl-item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.6vw, 2.1rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .tl-title {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(1.08rem, 2.2vw, 1.34rem);
  letter-spacing: -0.02em;
  color: var(--mist);
}

.page-about .tl-body p {
  margin: 0 0 10px;
  max-width: 64ch;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--warm-gray);
}

.page-about .tl-meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--slate);
}

/* ---------- 团队 ---------- */
.page-about .about-team-banner {
  margin: 0 0 clamp(28px, 4vw, 48px);
}

.page-about .about-team-banner img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: clamp(190px, 34vw, 360px);
  object-fit: cover;
  filter: brightness(0.76) saturate(0.8);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .about-team-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .team-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(20px, 3vw, 30px);
  background: var(--about-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}

.page-about .team-card--total {
  background: linear-gradient(155deg, rgba(34, 230, 210, 0.16), rgba(27, 42, 94, 0.62) 62%);
  border-color: var(--line-strong);
  border-radius: var(--radius);
  clip-path: var(--clip-corner);
}

.page-about .team-num {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .team-num small {
  font-family: var(--font-sans);
  font-size: 0.86rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--warm-gray);
}

.page-about .team-card--data .team-num {
  color: var(--orange);
}

.page-about .team-name {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 1.02rem;
  letter-spacing: -0.015em;
  color: var(--mist);
}

.page-about .team-desc {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--warm-gray);
}

/* ---------- 覆盖 ---------- */
.page-about .about-reach-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .reach-cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(18px, 3vw, 28px);
  background: rgba(11, 18, 48, 0.94);
}

.page-about .reach-cell--accent {
  background: linear-gradient(160deg, rgba(255, 122, 26, 0.16), rgba(11, 18, 48, 0.94) 72%);
}

.page-about .reach-value {
  display: flex;
  align-items: baseline;
  gap: 3px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  line-height: 1;
  color: var(--mist);
  font-variant-numeric: tabular-nums;
}

.page-about .reach-cell--accent .reach-value {
  color: var(--orange);
}

.page-about .reach-value em {
  font-family: var(--font-sans);
  font-style: normal;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--slate);
}

.page-about .reach-label {
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--warm-gray);
}

.page-about .about-reach-note {
  margin: 22px 0 0;
  max-width: 66ch;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--slate);
  padding-left: 16px;
  border-left: 2px solid var(--line-strong);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco-inner {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 60px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-eco-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
  opacity: 0.26;
  filter: saturate(0.55) contrast(1.05);
}

.page-about .about-eco-inner::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background: linear-gradient(115deg, rgba(11, 18, 48, 0.94) 34%, rgba(11, 18, 48, 0.5) 100%);
}

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

.page-about .about-eco-content .section-title {
  margin: 10px 0 14px;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.4vw, 2.2rem);
  line-height: 1.18;
  letter-spacing: -0.03em;
  color: var(--mist);
}

.page-about .about-eco-content .section-lede {
  margin: 0;
  max-width: 58ch;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--warm-gray);
}

.page-about .eco-nodes {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .eco-node {
  flex: 1 1 210px;
  min-width: 0;
  padding: 16px 18px;
  background: rgba(11, 18, 48, 0.74);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .eco-node:hover,
.page-about .eco-node:focus-visible {
  outline: none;
  border-color: var(--cyan);
  background: rgba(14, 107, 107, 0.38);
  transform: translateY(-3px);
}

.page-about .eco-node-name {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .eco-node-type {
  display: block;
  margin-top: 8px;
  font-size: 0.84rem;
  line-height: 1.65;
  color: var(--warm-gray);
}

.page-about .eco-award {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin: 26px 0 0;
  padding: 10px 16px;
  font-size: 0.88rem;
  color: var(--mist);
  background: rgba(255, 122, 26, 0.1);
  border-left: 2px solid var(--orange);
}

/* ---------- 服务原则 ---------- */
.page-about .about-principles-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .principle-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(22px, 3vw, 32px);
  border: 1px solid rgba(34, 230, 210, 0.38);
  border-radius: var(--radius);
  background: linear-gradient(172deg, rgba(34, 230, 210, 0.09), rgba(11, 18, 48, 0.2) 62%);
}

.page-about .principle-card:nth-child(3) {
  border-color: rgba(255, 122, 26, 0.4);
  background: linear-gradient(172deg, rgba(255, 122, 26, 0.08), rgba(11, 18, 48, 0.2) 62%);
}

.page-about .principle-index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--slate);
}

.page-about .principle-card h3 {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 1.06rem;
  letter-spacing: -0.015em;
  color: var(--mist);
}

.page-about .principle-card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--warm-gray);
}

.page-about .principle-link {
  margin-top: auto;
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.03em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 230, 210, 0.4);
  padding-bottom: 2px;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .principle-link:hover,
.page-about .principle-link:focus-visible {
  color: var(--mist-cyan);
  border-color: var(--mist-cyan);
}

/* ---------- 路线图 ---------- */
.page-about .about-head--roadmap {
  max-width: 660px;
}

.page-about .roadmap-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
}

.page-about .roadmap-item {
  display: grid;
  gap: 8px;
  padding: clamp(20px, 3vw, 30px) 0;
  border-top: 1px solid var(--line);
}

.page-about .roadmap-item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .roadmap-code {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.92rem;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .roadmap-body h3 {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(1.02rem, 2vw, 1.22rem);
  letter-spacing: -0.02em;
  color: var(--mist);
}

.page-about .roadmap-body p {
  margin: 0;
  max-width: 64ch;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--warm-gray);
}

.page-about .about-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(28px, 4vw, 44px);
  padding-bottom: clamp(16px, 4vw, 48px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-principles-grid .principle-card:first-child {
    grid-column: span 2;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  }

  .page-about .tl-item {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(20px, 3vw, 46px);
  }

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

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

  .page-about .about-principles-grid .principle-card:first-child {
    grid-column: span 1;
  }

  .page-about .roadmap-item {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: clamp(18px, 3vw, 40px);
  }
}

@media (min-width: 1024px) {
  .page-about .about-team-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .team-card--total {
    grid-column: span 5;
    grid-row: span 2;
    justify-content: space-between;
  }

  .page-about .team-card--content {
    grid-column: span 7;
  }

  .page-about .team-card--data {
    grid-column: span 4;
  }

  .page-about .team-card--service {
    grid-column: span 3;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .eco-node,
  .page-about .principle-link {
    transition: none;
  }

  .page-about .eco-node:hover,
  .page-about .eco-node:focus-visible {
    transform: none;
  }
}