.page-about {
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-sans);
  overflow-x: clip;
}

.page-about .band {
  position: relative;
  padding-block: clamp(48px, 7vw, 92px);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  padding-top: 22px;
  padding-bottom: 10px;
  font-size: 0.88rem;
  color: var(--muted);
}

.page-about .breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .breadcrumbs a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .breadcrumbs span[aria-hidden] {
  color: var(--ink-glass);
}

/* ---------- 首屏拼贴 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(26px, 4vw, 46px) clamp(50px, 8vw, 96px);
  background:
    radial-gradient(118% 84% at 8% -8%, rgba(43, 227, 210, 0.16), transparent 58%),
    radial-gradient(84% 68% at 96% 10%, rgba(243, 181, 74, 0.12), transparent 62%),
    var(--ink-900);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto -12% -46% 38%;
  height: 74%;
  background: conic-gradient(from 208deg at 58% 42%,
    transparent 0deg, rgba(43, 227, 210, 0.10) 58deg, transparent 132deg);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 4vw, 52px);
}

.page-about .about-hero .display {
  margin: 12px 0 18px;
  max-width: 20ch;
  font-size: clamp(2rem, 5.4vw, 3.5rem);
  line-height: 1.12;
  letter-spacing: 0.015em;
  color: var(--paper);
}

.page-about .about-hero .lede {
  max-width: 46ch;
  color: var(--muted);
  font-size: clamp(1rem, 1.6vw, 1.08rem);
  line-height: 1.78;
}

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

.page-about .about-hero__meta {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  align-content: end;
}

.page-about .meta-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 20px;
  border-left: 2px solid var(--cyan-deep);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  background: linear-gradient(90deg, rgba(43, 227, 210, 0.12), rgba(43, 227, 210, 0.01) 82%);
}

.page-about .meta-card--gold {
  border-left-color: var(--gold);
  background: linear-gradient(90deg, rgba(243, 181, 74, 0.14), rgba(243, 181, 74, 0.01) 82%);
}

.page-about .meta-card__k {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .meta-card--gold .meta-card__k {
  color: var(--gold-light);
}

.page-about .meta-card__v {
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
}

/* ---------- 平台定位 ---------- */
.page-about .about-scope {
  background: var(--ink-800);
}

.page-about .about-scope__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .scope-card {
  position: relative;
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--radius-m);
  border: 1px solid var(--line-soft);
  background: linear-gradient(148deg, rgba(27, 53, 107, 0.52), rgba(8, 18, 41, 0.68));
  overflow: hidden;
}

.page-about .scope-card::after {
  content: "";
  position: absolute;
  right: -40px;
  bottom: -60px;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(43, 227, 210, 0.14), transparent 68%);
  pointer-events: none;
}

.page-about .scope-card__tag {
  margin: 0 0 10px;
  font-size: 0.86rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--cyan-deep);
}

.page-about .scope-card__title {
  margin: 0 0 10px;
  font-size: clamp(1.1rem, 2.4vw, 1.32rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .scope-card p {
  margin: 0;
  max-width: 62ch;
  font-size: 0.96rem;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 发展轨道 ---------- */
.page-about .about-history {
  background: var(--ink-900);
  overflow: hidden;
}

.page-about .about-history::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(112deg, transparent 36%, rgba(43, 227, 210, 0.05) 50%, transparent 64%);
  pointer-events: none;
}

.page-about .about-history__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 4vw, 52px);
  margin-top: clamp(26px, 4vw, 44px);
}

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

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg,
    rgba(43, 227, 210, 0.62), rgba(43, 227, 210, 0.16) 72%, rgba(43, 227, 210, 0));
}

.page-about .tl-item {
  position: relative;
  padding-left: 46px;
  padding-bottom: clamp(14px, 2vw, 22px);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan-deep);
  box-shadow: 0 0 0 4px rgba(43, 227, 210, 0.08);
  transition: border-color 0.4s ease, box-shadow 0.4s ease;
  z-index: 1;
}

.page-about .tl-item.is-visible::before,
.page-about .tl-item[open]::before {
  border-color: var(--cyan);
  box-shadow: 0 0 0 5px rgba(43, 227, 210, 0.16), 0 0 20px rgba(43, 227, 210, 0.45);
}

.page-about .tl-item > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 14px 0 10px;
  cursor: pointer;
  list-style: none;
}

.page-about .tl-item > summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-item > summary::marker {
  content: "";
}

.page-about .tl-item > summary::after {
  content: "";
  margin-left: auto;
  align-self: center;
  width: 8px;
  height: 8px;
  margin-top: -5px;
  border-right: 2px solid var(--cyan-deep);
  border-bottom: 2px solid var(--cyan-deep);
  transform: rotate(45deg);
  transition: transform 0.24s ease, margin-top 0.24s ease;
}

.page-about .tl-item[open] > summary::after {
  transform: rotate(-135deg);
  margin-top: 5px;
}

.page-about .tl-node {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--cyan);
}

.page-about .tl-item__title {
  font-size: clamp(1.02rem, 2.2vw, 1.24rem);
  font-weight: 700;
  letter-spacing: 0.015em;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .tl-item__body {
  padding: 14px 20px 18px;
  border-left: 1px solid var(--line-cyan);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  background: linear-gradient(90deg, rgba(27, 53, 107, 0.42), rgba(27, 53, 107, 0.05));
}

.page-about .tl-item__body p {
  margin: 0;
  max-width: 60ch;
  font-size: 0.95rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-history__media {
  margin: 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--line-cyan);
  background: var(--ink-800);
  box-shadow: var(--shadow-deep);
}

.page-about .about-history__media img,
.page-about .about-scale__media img,
.page-about .about-security__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-history__caption {
  padding: 12px 16px 16px;
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 规模与覆盖 ---------- */
.page-about .about-scale {
  background: linear-gradient(180deg, var(--ink-800), var(--ink-900));
}

.page-about .about-scale::before {
  content: "";
  position: absolute;
  inset: -1px 0 auto 0;
  height: 170px;
  background: radial-gradient(70% 100% at 50% 0%, rgba(43, 227, 210, 0.10), transparent 72%);
  pointer-events: none;
}

.page-about .about-scale__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-scale__copy p {
  max-width: 56ch;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-scale__copy .btn {
  margin-top: 18px;
}

.page-about .about-scale__media {
  margin: 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--line-cyan);
  background: var(--ink-glass);
  box-shadow: var(--shadow-deep);
}

.page-about .scale-strip {
  position: relative;
  list-style: none;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius-m);
  overflow: hidden;
  background: var(--line-cyan);
}

.page-about .scale-strip li {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(18px, 3vw, 30px);
  background: linear-gradient(180deg, rgba(8, 18, 41, 0.92), rgba(16, 33, 71, 0.86));
}

.page-about .scale-num {
  font-family: var(--font-mono);
  font-size: clamp(1.65rem, 4.4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .scale-label {
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 支持团队 ---------- */
.page-about .about-support {
  background: var(--ink-800);
}

.page-about .lines {
  display: grid;
  gap: 14px;
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .line-card {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  background: linear-gradient(118deg, rgba(27, 53, 107, 0.40), rgba(16, 33, 71, 0.26));
  transition: border-color 0.24s ease, background 0.24s ease;
}

.page-about .line-card[open] {
  border-color: var(--line-cyan);
  background: linear-gradient(118deg, rgba(27, 53, 107, 0.62), rgba(16, 33, 71, 0.36));
}

.page-about .line-card__head {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px clamp(16px, 3vw, 26px);
  cursor: pointer;
  list-style: none;
}

.page-about .line-card__head::-webkit-details-marker {
  display: none;
}

.page-about .line-card__head::marker {
  content: "";
}

.page-about .line-tag {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  border: 1px solid var(--line-cyan);
  background: rgba(43, 227, 210, 0.12);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
}

.page-about .line-card__text {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.page-about .line-card__name {
  font-size: clamp(1.02rem, 2.2vw, 1.18rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .line-card__hint {
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--muted);
}

.page-about .line-card__arrow {
  flex: 0 0 auto;
  margin-left: auto;
  width: 8px;
  height: 8px;
  margin-top: -5px;
  border-right: 2px solid var(--cyan-deep);
  border-bottom: 2px solid var(--cyan-deep);
  transform: rotate(45deg);
  transition: transform 0.24s ease, margin-top 0.24s ease;
}

.page-about .line-card[open] .line-card__arrow {
  transform: rotate(-135deg);
  margin-top: 5px;
}

.page-about .line-card__body {
  padding: 0 clamp(16px, 3vw, 26px) 20px clamp(50px, 7vw, 76px);
}

.page-about .line-card__body p {
  margin: 0;
  max-width: 58ch;
  font-size: 0.95rem;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 安全与合规 ---------- */
.page-about .about-security {
  background: var(--ink-900);
}

.page-about .about-security__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-security__copy > p {
  max-width: 56ch;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .sec-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .sec-list li {
  position: relative;
  padding: 14px 18px 14px 46px;
  border-radius: var(--radius-s);
  border-left: 2px solid var(--cyan-deep);
  background: linear-gradient(100deg, rgba(27, 53, 107, 0.48), rgba(16, 33, 71, 0.12));
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .sec-list li::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 22px;
  width: 11px;
  height: 6px;
  border-left: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  transform: rotate(-45deg);
}

.page-about .sec-key {
  display: inline-block;
  margin-right: 8px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-security__media {
  margin: 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--line-cyan);
  background: radial-gradient(circle at 50% 45%, rgba(43, 227, 210, 0.14), rgba(8, 18, 41, 0.9) 70%);
  box-shadow: var(--shadow-deep);
}

/* ---------- 合作与内容 ---------- */
.page-about .about-partners {
  background: var(--ink-800);
}

.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .partner-card {
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--radius-m);
  border: 1px solid var(--line-soft);
  background: linear-gradient(152deg, rgba(27, 53, 107, 0.52), rgba(8, 18, 41, 0.72));
}

.page-about .partner-card--gold {
  border-color: rgba(243, 181, 74, 0.34);
  background: linear-gradient(152deg, rgba(243, 181, 74, 0.13), rgba(8, 18, 41, 0.74));
}

.page-about .partner-card__k {
  margin: 0;
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .partner-card__v {
  margin: 8px 0 10px;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3vw, 1.7rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--cyan);
}

.page-about .partner-card--gold .partner-card__v {
  color: var(--gold-light);
}

.page-about .partner-card__d {
  margin: 0;
  max-width: 52ch;
  font-size: 0.92rem;
  line-height: 1.74;
  color: var(--muted);
}

.page-about .about-partners__cta {
  margin: clamp(24px, 4vw, 36px) 0 0;
}

/* ---------- 收束信息条 ---------- */
.page-about .about-strip {
  background:
    radial-gradient(80% 120% at 86% 0%, rgba(243, 181, 74, 0.10), transparent 62%),
    var(--ink-900);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-strip__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 32px);
}

.page-about .about-strip__title {
  margin: 0 0 10px;
  font-size: clamp(1.3rem, 3.2vw, 1.9rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .about-strip__inner > div > p {
  margin: 0;
  max-width: 58ch;
  font-size: 0.96rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-strip__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-strip__meta {
  margin: 0;
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 860px) {
  .page-about .about-strip__inner {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    align-items: center;
  }

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

@media (min-width: 900px) {
  .page-about .about-scope__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .scope-card:nth-child(1) {
    grid-column: 1 / span 7;
  }

  .page-about .scope-card:nth-child(2) {
    grid-column: 8 / span 5;
    margin-top: 34px;
  }

  .page-about .scope-card:nth-child(3) {
    grid-column: 3 / span 8;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr) minmax(0, 1fr);
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(250px, 0.8fr);
    align-items: end;
  }

  .page-about .about-scale__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: center;
  }

  .page-about .about-security__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 400px);
    align-items: center;
  }
}

@media (min-width: 1020px) {
  .page-about .about-history__grid {
    grid-template-columns: minmax(0, 1fr) 262px;
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .scale-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}