.page-about {
  background: var(--ink);
  color: var(--body);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(24px, 5vw, 56px) clamp(34px, 6vw, 72px);
  border-bottom: 1px solid var(--line-soft);
  background:
    radial-gradient(120% 90% at 8% 0%, rgba(56, 242, 208, 0.1), transparent 58%),
    radial-gradient(90% 80% at 100% 100%, rgba(255, 122, 47, 0.08), transparent 60%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(30, 58, 95, 0.4) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 58, 95, 0.4) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0.35) 62%, transparent 100%);
  mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0.35) 62%, transparent 100%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.2rem, 7vw, 4.9rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--title);
}

.page-about .about-hero h1 b {
  font-weight: 700;
  font-family: var(--font-mono);
  font-size: 0.86em;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 60ch;
  font-size: clamp(0.98rem, 1.15vw, 1.1rem);
  line-height: 1.9;
  color: var(--body);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* 概览面板 */
.page-about .about-board {
  position: relative;
  padding: 20px 18px 16px;
  border: 1px solid var(--line);
  background: linear-gradient(165deg, var(--panel-hi), var(--ink-deep));
  box-shadow: 6px 6px 0 -1px rgba(30, 58, 95, 0.55), var(--shadow-soft);
}

.page-about .about-board__status {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .about-board__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 0 4px rgba(43, 217, 138, 0.16);
}

.page-about .about-board__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 12px;
  margin: 16px 0 0;
}

.page-about .about-fact dt {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .about-fact dd {
  margin: 4px 0 0;
  display: flex;
  align-items: baseline;
  gap: 3px;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  line-height: 1;
  color: var(--title);
}

.page-about .about-fact__unit {
  font-size: 0.76rem;
  color: var(--muted);
}

.page-about .about-board__index {
  list-style: none;
  margin: 18px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--line-soft);
  display: grid;
  gap: 2px;
}

.page-about .about-board__index a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 6px 8px;
  margin-inline: -8px;
  font-size: 0.86rem;
  color: var(--body);
  text-decoration: none;
  border-radius: var(--radius);
  transition: background 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .about-board__index a span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
}

.page-about .about-board__index a:hover,
.page-about .about-board__index a:focus-visible {
  background: rgba(56, 242, 208, 0.08);
  color: var(--title);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding-block: clamp(38px, 5.5vw, 76px);
}

.page-about .about-section--dash {
  background: linear-gradient(180deg, rgba(13, 31, 54, 0.72), rgba(7, 20, 38, 0));
  border-block: 1px solid var(--line-soft);
}

.page-about .about-head {
  display: grid;
  gap: 16px;
  margin-bottom: clamp(22px, 3vw, 36px);
}

.page-about .about-head h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.65rem, 3.8vw, 2.6rem);
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--title);
}

.page-about .about-head p {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.9;
  color: var(--body);
}

/* ---------- 四条主线卡片 ---------- */
.page-about .line-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .line-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px 16px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--panel), var(--ink-deep));
  color: inherit;
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .line-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 38px;
  height: 2px;
  background: var(--cyan);
}

.page-about .line-card:nth-child(2)::before { background: var(--orange); }
.page-about .line-card:nth-child(3)::before { background: var(--gold); }
.page-about .line-card:nth-child(4)::before { background: var(--ok); }

.page-about .line-card:hover,
.page-about .line-card:focus-visible {
  border-color: rgba(56, 242, 208, 0.6);
  transform: translateY(-3px);
}

.page-about .line-card__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .line-card__title {
  font-family: var(--font-display);
  font-size: 1.06rem;
  font-weight: 600;
  color: var(--title);
}

.page-about .line-card__text {
  font-size: 0.89rem;
  line-height: 1.78;
  color: var(--body);
}

.page-about .line-card__go {
  margin-top: auto;
  padding-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 数据仪表板 ---------- */
.page-about .dash {
  position: relative;
  padding: clamp(20px, 3.4vw, 38px);
  border: 1px solid var(--line);
  background:
    radial-gradient(120% 130% at 6% 0%, rgba(56, 242, 208, 0.13), transparent 55%),
    radial-gradient(90% 110% at 96% 100%, rgba(242, 196, 107, 0.1), transparent 60%),
    linear-gradient(150deg, var(--panel-hi), var(--ink-deep));
  overflow: hidden;
}

.page-about .dash__primary {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .dash-stat__num {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 3px;
  font-family: var(--font-mono);
  font-size: clamp(2.1rem, 6vw, 3.4rem);
  line-height: 1;
  color: var(--title);
}

.page-about .dash-stat__num span {
  font-size: 0.36em;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .dash-stat:nth-child(2) .dash-stat__num span { color: var(--gold); }
.page-about .dash-stat:nth-child(3) .dash-stat__num span { color: var(--orange); }

.page-about .dash-stat__label {
  margin: 8px 0 0;
  font-size: 0.84rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .dash__secondary {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin: 0;
  padding: 18px 0 0;
}

.page-about .dash-chip {
  display: flex;
  align-items: baseline;
  gap: 7px;
  font-size: 0.85rem;
  color: var(--body);
}

.page-about .dash-chip b {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 500;
  color: var(--cyan);
}

.page-about .dash-chip:nth-child(2) b { color: var(--title); }
.page-about .dash-chip:nth-child(3) b { color: var(--gold); }
.page-about .dash-chip:nth-child(4) b { color: var(--orange); }
.page-about .dash-chip:nth-child(5) b { color: var(--ok); }

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-fig {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-deep);
}

.page-about .about-fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-fig .fig__cap {
  padding: 10px 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

/* 折叠组 */
.page-about .about-fold {
  border: 1px solid var(--line);
  background: var(--panel);
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .about-fold + .about-fold {
  margin-top: 8px;
}

.page-about .about-fold.is-open {
  border-color: rgba(56, 242, 208, 0.55);
  background: var(--panel-hi);
}

.page-about .about-fold__trigger {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 14px 16px;
  border: 0;
  background: none;
  color: var(--title);
  font-family: var(--font-body);
  font-size: 0.95rem;
  text-align: left;
  cursor: pointer;
}

.page-about .about-fold__trigger:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .about-fold__label {
  flex: 1 1 auto;
}

.page-about .about-fold__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-fold__sign {
  position: relative;
  flex: 0 0 auto;
  width: 12px;
  height: 12px;
}

.page-about .about-fold__sign::before,
.page-about .about-fold__sign::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform 0.28s var(--ease);
}

.page-about .about-fold__sign::before {
  left: 0;
  top: 5px;
  width: 12px;
  height: 1px;
}

.page-about .about-fold__sign::after {
  left: 5px;
  top: 0;
  width: 1px;
  height: 12px;
}

.page-about .about-fold.is-open .about-fold__sign::after {
  transform: scaleY(0);
}

.page-about .about-fold__panel {
  padding: 0 16px 16px;
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--body);
}

.page-about .about-fold__panel p {
  margin: 0;
}

.page-about .about-fold__panel[hidden] {
  display: none;
}

/* ---------- 时间轴 ---------- */
.page-about .about-fig--wide {
  margin-bottom: clamp(22px, 3vw, 36px);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  max-width: 820px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(to bottom, var(--cyan), var(--line) 55%, transparent);
}

.page-about .timeline__item {
  position: relative;
  padding-left: 26px;
}

.page-about .timeline__item + .timeline__item {
  margin-top: 8px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 21px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 3px rgba(56, 242, 208, 0.12);
}

.page-about .timeline__fold {
  border-color: transparent;
  background: transparent;
}

.page-about .timeline__fold.is-open {
  border-color: var(--line);
  background: var(--panel);
}

.page-about .timeline__trigger {
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  padding: 12px 4px;
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 3vw, 1.7rem);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .timeline__item:nth-child(4) .timeline__year { color: var(--gold); }
.page-about .timeline__item:nth-child(5) .timeline__year { color: var(--orange); }

.page-about .timeline__stage {
  flex: 1 1 180px;
  font-size: 0.94rem;
  color: var(--title);
}

.page-about .timeline__fold .about-fold__panel {
  padding: 0 4px 14px;
}

/* ---------- 资质与合作 ---------- */
.page-about .trust-grid {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
}

.page-about .cert-stack {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .cert {
  padding: 13px 16px;
  border: 1px solid var(--line);
  background: var(--panel);
  font-size: 0.87rem;
  line-height: 1.6;
  color: var(--title);
  box-shadow: 5px 5px 0 rgba(30, 58, 95, 0.5);
}

.page-about .cert:nth-child(1) { transform: rotate(-0.5deg); }
.page-about .cert:nth-child(2) { transform: rotate(0.4deg); }

.page-about .cert:nth-child(3) {
  border-color: rgba(242, 196, 107, 0.6);
  color: var(--gold);
  transform: rotate(-0.3deg);
}

.page-about .eco {
  position: relative;
  padding: clamp(18px, 3vw, 28px);
  border: 1px solid var(--line-soft);
  background:
    radial-gradient(80% 90% at 100% 0%, rgba(56, 242, 208, 0.1), transparent 60%),
    linear-gradient(170deg, rgba(13, 31, 54, 0.95), rgba(4, 13, 25, 0.95));
}

.page-about .eco__hub {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--line);
}

.page-about .eco__hubNum {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5vw, 2.8rem);
  line-height: 1;
  color: var(--cyan);
}

.page-about .eco__hubLabel {
  font-size: 0.9rem;
  color: var(--body);
}

.page-about .eco__text {
  margin: 16px 0 0;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--body);
}

.page-about .eco__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
}

.page-about .eco__list li {
  position: relative;
  padding: 7px 12px 7px 22px;
  border: 1px solid var(--line);
  background: var(--ink-deep);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--body);
}

.page-about .eco__list li::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 50%;
  width: 5px;
  height: 5px;
  margin-top: -2.5px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .eco__list li:nth-child(even)::before { background: var(--orange); }

/* ---------- 结尾入口 ---------- */
.page-about .about-cta-wrap {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-cta {
  position: relative;
  padding: clamp(24px, 4vw, 46px);
  border: 1px solid var(--line);
  background:
    linear-gradient(90deg, rgba(56, 242, 208, 0.6), rgba(255, 122, 47, 0.55)) top / 100% 2px no-repeat,
    radial-gradient(110% 120% at 100% 0%, rgba(255, 122, 47, 0.1), transparent 58%),
    linear-gradient(160deg, var(--panel-hi), var(--ink-deep));
}

.page-about .about-cta h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.6rem, 3.6vw, 2.4rem);
  line-height: 1.18;
  color: var(--title);
}

.page-about .about-cta__head p {
  margin: 14px 0 0;
  max-width: 66ch;
  font-size: 0.94rem;
  line-height: 1.9;
  color: var(--body);
}

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

.page-about .about-cta__note {
  margin: 18px 0 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.page-about .about-cta__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(56, 242, 208, 0.4);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .line-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

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

@media (min-width: 900px) {
  .page-about .about-head {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: end;
    gap: clamp(24px, 4vw, 48px);
  }

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

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

@media (min-width: 1024px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.42fr) minmax(290px, 0.78fr);
    align-items: end;
  }

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

  .page-about .about-cta__head p {
    max-width: 62ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .line-card,
  .page-about .about-fold,
  .page-about .about-fold__sign::after,
  .page-about .about-board__index a {
    transition: none;
  }

  .page-about .line-card:hover,
  .page-about .line-card:focus-visible {
    transform: none;
  }
}