.page-about {
  --label-accent: var(--color-moss);
  --ecosystem-accent: var(--color-moss);
  --ecosystem-soft: rgba(107, 124, 103, 0.14);
  color: var(--color-ink);
}

.page-about .section {
  padding: 3rem 0;
}

.page-about .section-head {
  margin-bottom: 2rem;
}

.page-about .section-title {
  font-size: var(--fs-title);
  margin: 0 0 0.5rem;
  letter-spacing: -0.01em;
}

.page-about .section-desc {
  max-width: 36rem;
  color: rgba(47, 44, 41, 0.74);
  font-size: 0.95rem;
  margin: 0;
}

/* ===== Hero ===== */
.page-about-hero {
  position: relative;
  overflow: hidden;
  padding: 2rem 0 3rem;
}

.page-about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(115deg, transparent 0 58%, rgba(138, 134, 127, 0.12) 58% 59%, transparent 59%),
    repeating-linear-gradient(-45deg, transparent 0 10px, rgba(47, 44, 41, 0.035) 10px 11px),
    var(--color-canvas);
  z-index: 0;
}

.page-about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--color-arena) 0 62%, var(--color-volt) 62% 100%);
  z-index: 1;
}

.page-about-hero > .container {
  position: relative;
  z-index: 1;
}

.page-about-breadcrumbs {
  margin-bottom: 1.5rem;
}

.page-about-hero-grid {
  display: grid;
  gap: 2rem;
  align-items: start;
}

.page-about-hero-kicker {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--color-clay);
  margin: 0 0 0.6rem;
  text-transform: uppercase;
}

.page-about-hero h1 {
  font-size: var(--fs-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
}

.page-about-hero-copy .lead {
  font-size: var(--fs-lead);
  font-weight: 500;
  line-height: 1.55;
  margin: 0 0 0.8rem;
  max-width: 38rem;
}

.page-about-hero-desc {
  color: rgba(47, 44, 41, 0.76);
  line-height: 1.7;
  margin: 0;
  max-width: 36rem;
}

.page-about-hero-facts {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}

.page-about-hero-fact {
  display: flex;
  gap: 0.8rem;
  align-items: flex-start;
  background: var(--glass-bg);
  border: 1px solid var(--line-light);
  border-left: 4px solid var(--color-neon);
  border-radius: 10px;
  padding: 0.85rem 1rem;
}

.page-about-hero-fact strong {
  flex: 0 0 42%;
  font-size: 0.875rem;
  line-height: 1.5;
}

.page-about-hero-fact span {
  font-size: 0.85rem;
  line-height: 1.6;
  color: rgba(47, 44, 41, 0.76);
}

.page-about-hero-actions {
  margin-top: 1.4rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.page-about-hero-aside {
  display: grid;
  gap: 1rem;
}

.page-about-hero-card {
  background: var(--glass-bg);
  border: 1px solid var(--line-light);
  border-radius: var(--radius);
  padding: 1.2rem 1.3rem;
  display: grid;
  gap: 0.4rem;
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(8px);
}

.page-about-hero-card-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--color-clay);
}

.page-about-hero-card strong {
  font-size: 1.15rem;
  line-height: 1.4;
}

.page-about-hero-card-sub {
  font-size: 0.8rem;
  color: rgba(47, 44, 41, 0.66);
}

.page-about-hero-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
}

.page-about-hero-stat .stat-num {
  font-size: 1.9rem;
  line-height: 1;
}

.page-about-hero-stat .stat-label {
  font-size: 0.8rem;
}

/* ===== 时间轴 ===== */
.page-about-timeline {
  background:
    radial-gradient(circle at 88% 12%, rgba(184, 86, 62, 0.14), transparent 36%),
    var(--color-canvas);
}

.page-about-timeline-layout {
  display: grid;
  gap: 2rem;
}

.page-about-filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

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

.page-about-timeline-list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 4px;
  bottom: 22px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-arena) 0 18%, var(--color-clay) 18% 55%, var(--color-moss) 55% 100%);
  border-radius: 2px;
}

.page-about-timeline-item {
  position: relative;
  padding: 0 0 2rem 2.1rem;
}

.page-about-timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.3rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-arena);
  border: 3px solid var(--color-canvas);
  box-shadow: 0 0 0 4px rgba(230, 49, 37, 0.2);
}

.page-about-timeline-item:nth-child(4)::before {
  background: var(--color-clay);
  box-shadow: 0 0 0 4px rgba(184, 86, 62, 0.2);
}

.page-about-timeline-item:last-child::before {
  background: var(--color-moss);
  box-shadow: 0 0 0 4px rgba(107, 124, 103, 0.2);
}

.page-about-timeline-year {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 1.6rem;
  line-height: 1.1;
  color: var(--color-clay);
  display: block;
  margin-bottom: 0.35rem;
  letter-spacing: 0.02em;
}

.page-about-timeline-body h3 {
  font-size: 1.08rem;
  margin: 0 0 0.4rem;
}

.page-about-timeline-body p {
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(47, 44, 41, 0.76);
  margin: 0;
  max-width: 34rem;
}

.page-about-timeline-aside {
  display: grid;
  gap: 0.9rem;
  align-content: start;
}

.page-about-timeline-media {
  aspect-ratio: 5 / 4;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.page-about-timeline-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about-brand-note {
  background: var(--color-clay);
  border-radius: var(--radius);
  padding: 1.3rem 1.4rem;
  color: #fff;
  display: grid;
  gap: 0.45rem;
  box-shadow: var(--shadow-card);
}

.page-about-brand-note-label {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.8;
}

.page-about-brand-note strong {
  font-size: 1.2rem;
  letter-spacing: -0.01em;
}

.page-about-brand-note p {
  font-size: 0.88rem;
  line-height: 1.7;
  margin: 0;
  opacity: 0.92;
}

/* ===== 标签 ===== */
.page-about-label-grid {
  display: grid;
  gap: 1rem;
}

.page-about-label-card {
  position: relative;
  overflow: hidden;
  padding: 1.5rem 1.4rem 1.7rem;
  border-top: 4px solid var(--label-accent);
  border-radius: var(--radius);
  background: var(--color-canvas);
}

.page-about-label-card--data {
  --label-accent: var(--color-volt);
  background: linear-gradient(180deg, rgba(0, 98, 255, 0.08), var(--color-canvas) 48%);
}

.page-about-label-card--schedule {
  --label-accent: var(--color-clay);
  background: linear-gradient(180deg, rgba(184, 86, 62, 0.12), var(--color-canvas) 48%);
}

.page-about-label-card--report {
  --label-accent: var(--color-arena);
  background: linear-gradient(180deg, rgba(230, 49, 37, 0.09), var(--color-canvas) 48%);
}

.page-about-label-card--guide {
  --label-accent: var(--color-moss);
  background: linear-gradient(180deg, rgba(107, 124, 103, 0.13), var(--color-canvas) 48%);
}

.page-about-label-num {
  position: absolute;
  right: 1.2rem;
  bottom: 0.3rem;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 4.6rem;
  line-height: 1;
  color: rgba(47, 44, 41, 0.07);
  pointer-events: none;
  user-select: none;
}

.page-about-label-card h3 {
  font-size: 1.14rem;
  margin: 0.8rem 0 0.6rem;
}

.page-about-label-card p {
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(47, 44, 41, 0.76);
  margin: 0;
}

.page-about-label-list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.45rem;
}

.page-about-label-list li {
  position: relative;
  padding-left: 1.15rem;
  font-size: 0.88rem;
  color: rgba(47, 44, 41, 0.8);
}

.page-about-label-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.48em;
  width: 0.44rem;
  height: 0.44rem;
  border-radius: 50%;
  background: var(--label-accent);
}

.page-about-label-link {
  position: relative;
  z-index: 1;
  display: inline-block;
  margin-top: 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-volt);
}

/* ===== 数据规模 ===== */
.page-about-scale-board {
  background: var(--color-rock);
  border-radius: var(--radius);
  padding: 1.7rem 1.4rem;
  color: var(--color-canvas);
  display: grid;
  gap: 1.7rem;
  box-shadow: var(--shadow-card);
}

.page-about-scale-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
}

.page-about-scale-item {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  background: rgba(244, 239, 232, 0.08);
  border: 1px solid rgba(244, 239, 232, 0.16);
  border-radius: 12px;
  padding: 1.3rem 1rem 1.2rem;
}

.page-about-scale-item--total {
  background: rgba(230, 49, 37, 0.2);
  border-color: rgba(230, 49, 37, 0.42);
}

.page-about-scale-item--cards {
  background: rgba(0, 98, 255, 0.2);
  border-color: rgba(0, 98, 255, 0.42);
}

.page-about-scale-item--updates {
  background: rgba(107, 124, 103, 0.26);
  border-color: rgba(107, 124, 103, 0.48);
}

.page-about-scale-item--round {
  background: rgba(216, 162, 65, 0.2);
  border-color: rgba(216, 162, 65, 0.44);
}

.page-about-scale-num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 2.5rem;
  line-height: 1;
  color: #fff;
  letter-spacing: -0.01em;
}

.page-about-scale-suffix {
  font-size: 1.7rem;
  margin-left: 0.08em;
}

.page-about-scale-unit {
  font-size: 1rem;
  font-weight: 600;
  margin-left: 0.28em;
}

.page-about-scale-label {
  font-size: 0.94rem;
  font-weight: 600;
}

.page-about-scale-note {
  font-size: 0.78rem;
  line-height: 1.5;
  opacity: 0.74;
}

.page-about-scale-visual {
  display: grid;
  gap: 0.7rem;
  align-content: center;
}

.page-about-scale-visual .media-caption {
  text-align: right;
}

/* ===== 团队 ===== */
.page-about-team-wrap {
  display: grid;
  gap: 1.6rem;
  align-items: start;
}

.page-about-team-viz {
  display: grid;
  gap: 1.1rem;
  align-content: start;
}

.page-about-team-dots {
  background: rgba(138, 134, 127, 0.14);
  border-radius: var(--radius);
  padding: 1.2rem 1.1rem;
  display: grid;
  gap: 0.7rem;
}

.page-about-team-dots-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about-team-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: block;
}

.page-about-team-dots-row--data .page-about-team-dot {
  background: var(--color-volt);
}

.page-about-team-dots-row--tech .page-about-team-dot {
  background: var(--color-clay);
}

.page-about-team-dots-row--cs .page-about-team-dot {
  background: var(--color-moss);
}

.page-about-team-dots-row--market .page-about-team-dot {
  background: var(--color-sand);
}

.page-about-team-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.1rem;
  font-size: 0.82rem;
  color: rgba(47, 44, 41, 0.76);
}

.page-about-team-legend span {
  display: inline-flex;
  align-items: center;
  gap: 0.38rem;
}

.page-about-team-legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.page-about-team-legend-dot--data {
  background: var(--color-volt);
}

.page-about-team-legend-dot--tech {
  background: var(--color-clay);
}

.page-about-team-legend-dot--cs {
  background: var(--color-moss);
}

.page-about-team-legend-dot--market {
  background: var(--color-sand);
}

.page-about-team-roles {
  display: grid;
  gap: 0.8rem;
}

.page-about-team-role {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  background: rgba(138, 134, 127, 0.1);
  border-radius: 12px;
  padding: 1.05rem 1.15rem;
  border-left: 4px solid var(--color-moss);
}

.page-about-team-role:nth-child(2) {
  border-left-color: var(--color-clay);
}

.page-about-team-role:nth-child(3) {
  border-left-color: var(--color-volt);
}

.page-about-team-role:nth-child(4) {
  border-left-color: var(--color-sand);
}

.page-about-team-role-num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 2.2rem;
  line-height: 1;
  color: var(--color-clay);
  min-width: 2.4rem;
}

.page-about-team-role h3 {
  font-size: 1rem;
  margin: 0 0 0.3rem;
}

.page-about-team-role p {
  font-size: 0.86rem;
  line-height: 1.65;
  margin: 0;
  color: rgba(47, 44, 41, 0.76);
}

.page-about-team-figure {
  margin: 0;
  display: grid;
  gap: 0.7rem;
}

/* ===== 安全 ===== */
.page-about-security-wrap {
  display: grid;
  gap: 1.6rem;
  align-items: start;
}

.page-about-security-shield {
  width: 96px;
  height: 96px;
  color: var(--color-moss);
}

.page-about-security-shield svg {
  width: 100%;
  height: 100%;
}

.page-about-security-list {
  display: grid;
  gap: 0.9rem;
}

.page-about-security-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  background: rgba(244, 239, 232, 0.72);
  border-left: 4px solid var(--color-moss);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1.1rem 1.25rem;
}

.page-about-security-item:nth-child(2) {
  border-left-color: var(--color-volt);
}

.page-about-security-item:nth-child(3) {
  border-left-color: var(--color-clay);
}

.page-about-security-item:nth-child(4) {
  border-left-color: var(--color-sand);
}

.page-about-security-item-num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 1.5rem;
  line-height: 1.1;
  color: var(--color-moss);
  min-width: 1.8rem;
}

.page-about-security-item h3 {
  font-size: 1rem;
  margin: 0 0 0.35rem;
}

.page-about-security-item p {
  font-size: 0.88rem;
  line-height: 1.68;
  margin: 0;
  color: rgba(47, 44, 41, 0.78);
}

/* ===== 生态 ===== */
.page-about-ecosystem-grid {
  display: grid;
  gap: 1rem;
}

.page-about-ecosystem-card {
  position: relative;
  overflow: hidden;
  padding: 1.5rem 1.4rem 1.7rem;
  border-top: 4px solid var(--ecosystem-accent);
  border-radius: var(--radius);
  background: var(--color-canvas);
}

.page-about-ecosystem-card::after {
  content: "";
  position: absolute;
  right: -34px;
  bottom: -34px;
  width: 110px;
  height: 110px;
  border-radius: 50%;
  background: var(--ecosystem-soft);
}

.page-about-ecosystem-card--calib {
  --ecosystem-accent: var(--color-volt);
  --ecosystem-soft: rgba(0, 98, 255, 0.12);
}

.page-about-ecosystem-card--fan {
  --ecosystem-accent: var(--color-clay);
  --ecosystem-soft: rgba(184, 86, 62, 0.14);
}

.page-about-ecosystem-card--indep {
  --ecosystem-accent: var(--color-moss);
  --ecosystem-soft: rgba(107, 124, 103, 0.16);
}

.page-about-ecosystem-card h3 {
  font-size: 1.1rem;
  margin: 0.9rem 0 0.6rem;
}

.page-about-ecosystem-card p {
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(47, 44, 41, 0.76);
  margin: 0;
}

/* ===== CTA ===== */
.page-about-cta {
  position: relative;
  overflow: hidden;
  margin-top: 2.8rem;
  background: var(--color-ink);
  color: var(--color-canvas);
  padding: 3rem 0;
}

.page-about-cta::before {
  content: "";
  position: absolute;
  right: -110px;
  top: -170px;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  background: rgba(230, 49, 37, 0.24);
}

.page-about-cta::after {
  content: "";
  position: absolute;
  left: 12%;
  bottom: -150px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: rgba(0, 98, 255, 0.16);
}

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

.page-about-cta-grid {
  display: grid;
  gap: 1.6rem;
}

.page-about-cta-copy h2 {
  font-size: var(--fs-title);
  margin: 0 0 0.8rem;
  letter-spacing: -0.01em;
}

.page-about-cta-copy p {
  color: rgba(244, 239, 232, 0.76);
  line-height: 1.7;
  margin: 0;
  max-width: 34rem;
}

.page-about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  align-items: center;
}

.page-about-cta .btn--ghost {
  border-color: rgba(244, 239, 232, 0.5);
  color: var(--color-canvas);
  background: transparent;
}

.page-about-cta .btn--ghost:hover,
.page-about-cta .btn--ghost:focus-visible {
  border-color: var(--color-neon);
  color: var(--color-neon);
}

/* ===== 响应式 ===== */
@media (min-width: 620px) {
  .page-about-hero-grid {
    grid-template-columns: 1fr 0.72fr;
    gap: 2rem;
  }

  .page-about-hero-fact {
    flex-direction: column;
    gap: 0.2rem;
  }

  .page-about-hero-fact strong {
    flex: none;
  }

  .page-about-label-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about-scale-board {
    grid-template-columns: 1fr 1fr;
    align-items: center;
    padding: 2rem 1.8rem;
  }

  .page-about-scale-stats {
    grid-template-columns: 1fr 1fr;
  }

  .page-about-team-roles {
    grid-template-columns: 1fr 1fr;
  }

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

@media (min-width: 960px) {
  .page-about .section {
    padding: 4.5rem 0;
  }

  .page-about-hero {
    padding: 3rem 0 4.5rem;
  }

  .page-about-hero-grid {
    grid-template-columns: 1.5fr 0.7fr;
    gap: 3rem;
  }

  .page-about-hero-aside {
    position: sticky;
    top: 2rem;
  }

  .page-about-timeline-layout {
    grid-template-columns: 1fr 0.42fr;
    gap: 3rem;
  }

  .page-about-timeline-aside {
    padding-top: 0.4rem;
  }

  .page-about-scale-board {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 3rem;
    padding: 2.6rem;
  }

  .page-about-team-wrap {
    grid-template-columns: 0.8fr 1.2fr 0.9fr;
    gap: 2rem;
  }

  .page-about-security-wrap {
    grid-template-columns: 0.32fr 1fr;
    gap: 2.6rem;
  }

  .page-about-security-shield {
    width: 160px;
    height: 160px;
    margin: 0 auto;
    color: var(--color-moss);
  }

  .page-about-ecosystem-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.2rem;
  }

  .page-about-cta {
    padding: 4.5rem 0;
  }

  .page-about-cta-grid {
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 3rem;
  }

  .page-about-cta-actions {
    justify-content: flex-end;
  }
}