.page-about {
  --about-line: rgba(255, 255, 255, 0.07);
  --about-grid: rgba(255, 255, 255, 0.045);
  background: var(--space-blue);
  color: var(--light-gray);
}

/* ===================== Hero ===================== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(var(--about-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid) 1px, transparent 1px),
    radial-gradient(ellipse at 82% 0%, rgba(0, 255, 138, 0.1), transparent 55%),
    linear-gradient(140deg, var(--space-blue) 0%, var(--deep-blue) 100%);
  background-size: 32px 32px, 32px 32px, 100% 100%, 100% 100%;
}

.page-about .about-hero::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 140px;
  height: 6px;
  background: linear-gradient(90deg, transparent, var(--lime));
}

.page-about .about-hero__grid {
  padding-block: 48px 40px;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 32px;
}

.page-about .about-hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--lime);
  text-transform: uppercase;
}

.page-about .about-hero__eyebrow::before {
  content: '';
  width: 9px;
  height: 9px;
  background: var(--lime);
  transform: rotate(45deg);
  flex-shrink: 0;
}

.page-about .about-hero__body {
  position: relative;
  padding-left: 16px;
}

.page-about .about-hero__body::before {
  content: '';
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 3px;
  background: linear-gradient(to bottom, var(--lime), rgba(0, 255, 138, 0.08));
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-size: clamp(1.85rem, 5vw, 3.25rem);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--white);
  margin: 16px 0 14px;
}

.page-about .about-hero__lead {
  color: var(--light-gray);
  font-size: 1rem;
  line-height: 1.7;
  max-width: 46rem;
  margin: 0;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .about-hero__fact {
  background: rgba(6, 19, 43, 0.72);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-top: 2px solid var(--lime);
  padding: 14px 16px;
  min-width: 0;
}

.page-about .about-hero__fact dt {
  font-size: 0.75rem;
  color: var(--mid-gray);
  margin-bottom: 6px;
}

.page-about .about-hero__fact dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--white);
  white-space: nowrap;
}

/* ===================== 通用 Section ===================== */
.page-about .about-section {
  padding-block: 64px;
}

/* ===================== 01 品牌使命 ===================== */
.page-about .about-mission {
  position: relative;
  border-top: 1px solid var(--about-line);
}

.page-about .about-mission__grid {
  display: grid;
  gap: 28px;
  margin-top: 36px;
}

.page-about .about-mission__statement {
  font-family: var(--font-head);
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  line-height: 1.3;
  color: var(--white);
  border-left: 4px solid var(--lime);
  padding-left: 16px;
  margin: 0 0 16px;
}

.page-about .about-mission__content p {
  color: var(--light-gray);
  line-height: 1.75;
  margin: 0 0 12px;
}

.page-about .about-mission__content a {
  color: var(--lime);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 255, 138, 0.35);
  transition: border-color var(--transition);
}

.page-about .about-mission__content a:hover,
.page-about .about-mission__content a:focus-visible {
  border-bottom-color: var(--lime);
}

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

.page-about .about-mission__visual::after {
  content: '';
  position: absolute;
  inset: 14px -14px -14px 14px;
  border: 1px solid rgba(0, 255, 138, 0.28);
  z-index: 1;
  pointer-events: none;
}

.page-about .about-mission__img {
  display: block;
  width: 100%;
  height: auto;
  position: relative;
  z-index: 2;
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 22px 100%, 0 calc(100% - 22px));
}

.page-about .about-values {
  display: grid;
  gap: 16px;
  margin-top: 56px;
}

.page-about .about-value-card {
  position: relative;
  padding: 24px 22px;
  background: var(--deep-blue);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-top: 3px solid var(--lime);
  transition: border-color var(--transition), background var(--transition);
}

.page-about .about-value-card:hover,
.page-about .about-value-card:focus-within {
  border-color: rgba(0, 255, 138, 0.5);
  background: rgba(0, 255, 138, 0.04);
}

.page-about .about-value-card__num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--orange);
  display: block;
  margin-bottom: 10px;
}

.page-about .about-value-card h3 {
  font-family: var(--font-head);
  font-size: 1.125rem;
  color: var(--white);
  margin: 0 0 8px;
}

.page-about .about-value-card p {
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--light-gray);
  margin: 0;
}

/* ===================== 02 发展里程碑 ===================== */
.page-about .about-timeline-section {
  background: var(--deep-blue);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.page-about .about-timeline {
  position: relative;
  max-width: 820px;
  margin-top: 40px;
}

.page-about .about-timeline::before {
  content: '';
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(
    to bottom,
    var(--lime) 0%,
    rgba(0, 255, 138, 0.35) 25%,
    rgba(0, 255, 138, 0.18) 70%,
    var(--orange) 100%
  );
}

.page-about .timeline-item {
  position: relative;
  padding-left: 34px;
  padding-bottom: 36px;
}

.page-about .timeline-item:last-child {
  padding-bottom: 4px;
}

.page-about .timeline-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 16px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(0, 255, 138, 0.12);
  transition: box-shadow var(--transition), transform var(--transition), background var(--transition);
  z-index: 2;
}

.page-about .timeline-item[data-revealed]::before {
  box-shadow: 0 0 0 6px rgba(0, 255, 138, 0.18), 0 0 24px rgba(0, 255, 138, 0.45);
}

.page-about .timeline-item:hover::before,
.page-about .timeline-item:focus-within::before {
  transform: scale(1.2);
  box-shadow: 0 0 0 8px rgba(0, 255, 138, 0.22), 0 0 28px rgba(0, 255, 138, 0.55);
}

.page-about .timeline-item__year {
  font-family: var(--font-head);
  font-size: clamp(2rem, 8vw, 2.75rem);
  line-height: 1;
  color: var(--orange);
  letter-spacing: 0.01em;
  margin-bottom: 10px;
}

.page-about .timeline-item__card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-left: 3px solid var(--lime);
  padding: 20px 22px;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}

.page-about .timeline-item:hover .timeline-item__card,
.page-about .timeline-item:focus-within .timeline-item__card {
  background: rgba(0, 255, 138, 0.05);
  border-color: rgba(0, 255, 138, 0.35);
  transform: translateX(4px);
}

.page-about .timeline-item__card .data-tag {
  margin-bottom: 10px;
}

.page-about .timeline-item__title {
  font-family: var(--font-head);
  font-size: 1.25rem;
  line-height: 1.3;
  color: var(--white);
  margin: 0 0 8px;
}

.page-about .timeline-item__desc {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--light-gray);
  margin: 0;
}

.page-about .timeline-item__extra {
  margin: 12px 0 0;
  padding-top: 10px;
  border-top: 1px dashed rgba(255, 255, 255, 0.12);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--lime);
}

.page-about .about-timeline__note {
  max-width: 760px;
  margin-top: 8px;
  padding: 14px 18px;
  border-left: 3px solid var(--orange);
  background: rgba(255, 107, 53, 0.06);
  color: var(--mid-gray);
  font-size: 0.875rem;
  line-height: 1.6;
}

/* ===================== 03 数据与团队规模 ===================== */
.page-about .about-scale {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.page-about .about-scale__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 36px;
}

.page-about .stat-card {
  position: relative;
  background: var(--deep-blue);
  border: 1px solid rgba(255, 255, 255, 0.07);
  padding: 22px 18px;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
  overflow: hidden;
}

.page-about .stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--lime), transparent 70%);
}

.page-about .stat-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  color: var(--white);
}

.page-about .stat-card__unit {
  color: var(--lime);
  font-size: 0.7em;
  margin-left: 2px;
}

.page-about .stat-card__label {
  display: block;
  margin-top: 8px;
  font-size: 0.8125rem;
  line-height: 1.4;
  color: var(--mid-gray);
}

.page-about .about-scale__grid {
  display: grid;
  gap: 28px;
  margin-top: 56px;
}

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

.page-about .about-scale__cover img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-scale__cover::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 1px solid rgba(0, 255, 138, 0.2);
  pointer-events: none;
}

.page-about .about-scale__cover-label {
  position: absolute;
  left: 14px;
  bottom: 14px;
  z-index: 2;
  background: var(--deep-blue);
  border-left: 3px solid var(--lime);
  padding: 10px 14px;
}

.page-about .about-scale__cover-label span {
  display: block;
  font-size: 0.75rem;
  color: var(--mid-gray);
}

.page-about .about-scale__cover-label strong {
  display: block;
  font-size: 0.9375rem;
  color: var(--white);
}

.page-about .about-scale__desc h3 {
  font-family: var(--font-head);
  font-size: 1.375rem;
  color: var(--white);
  margin: 0 0 12px;
}

.page-about .about-scale__desc p {
  color: var(--light-gray);
  line-height: 1.7;
  font-size: 0.9375rem;
  margin: 0 0 12px;
}

.page-about .about-scale__desc ul {
  list-style: none;
  margin: 16px 0 24px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-scale__desc li {
  position: relative;
  padding-left: 22px;
  color: var(--light-gray);
  font-size: 0.9375rem;
  line-height: 1.5;
}

.page-about .about-scale__desc li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 7px;
  width: 9px;
  height: 9px;
  background: var(--lime);
  transform: rotate(45deg);
}

.page-about .about-scale__team {
  display: grid;
  gap: 28px;
  margin-top: 56px;
  padding-top: 44px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-scale__team-img {
  position: relative;
}

.page-about .about-scale__team-img img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-scale__team-tag {
  position: absolute;
  right: 0;
  top: 12px;
  z-index: 2;
  background: var(--orange);
  color: var(--space-blue);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  padding: 6px 10px;
}

.page-about .about-scale__team-info h3 {
  font-family: var(--font-head);
  font-size: 1.375rem;
  color: var(--white);
  margin: 0 0 14px;
}

.page-about .about-scale__team-info p {
  color: var(--light-gray);
  line-height: 1.7;
  font-size: 0.9375rem;
  margin: 0 0 12px;
}

.page-about .about-scale__team-info a {
  color: var(--lime);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 255, 138, 0.35);
  transition: border-bottom-color var(--transition);
}

.page-about .about-scale__team-info a:hover,
.page-about .about-scale__team-info a:focus-visible {
  border-bottom-color: var(--lime);
}

/* ===================== 04 认证与承诺 ===================== */
.page-about .about-trust {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  background: var(--deep-blue);
}

.page-about .about-trust__grid {
  display: grid;
  gap: 16px;
  margin-top: 36px;
}

.page-about .about-trust__badge {
  padding: 28px 24px;
  background: rgba(10, 26, 63, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: border-color var(--transition), transform var(--transition);
}

.page-about .about-trust__badge:hover,
.page-about .about-trust__badge:focus-within {
  transform: translateY(-3px);
  border-color: rgba(0, 255, 138, 0.35);
}

.page-about .about-trust__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-head);
  font-size: 0.8125rem;
  font-weight: 800;
  color: var(--space-blue);
  background: var(--lime);
  margin-bottom: 18px;
}

.page-about .about-trust__badge:nth-child(2) .about-trust__icon {
  background: var(--orange);
  color: var(--white);
}

.page-about .about-trust__badge h3 {
  font-family: var(--font-head);
  font-size: 1.0625rem;
  color: var(--white);
  margin: 0 0 10px;
  line-height: 1.35;
}

.page-about .about-trust__badge p {
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--light-gray);
  margin: 0;
}

/* ===================== CTA ===================== */
.page-about .about-cta {
  position: relative;
  padding: 72px 0;
  background:
    linear-gradient(115deg, transparent 55%, rgba(0, 255, 138, 0.06) 55%),
    var(--space-blue);
}

.page-about .about-cta h2 {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  color: var(--white);
  margin: 0 0 12px;
  line-height: 1.25;
}

.page-about .about-cta p {
  color: var(--mid-gray);
  max-width: 540px;
  line-height: 1.7;
  margin: 0;
}

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

/* ===================== 桌面端增强 ===================== */
@media (min-width: 768px) {
  .page-about .about-values {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .timeline-item {
    display: grid;
    grid-template-columns: 116px minmax(0, 1fr);
    gap: 28px;
    padding-left: 40px;
  }

  .page-about .timeline-item__year {
    margin: 0;
    font-size: 3rem;
    text-align: right;
    padding-top: 10px;
  }

  .page-about .timeline-item::before {
    top: 24px;
  }

  .page-about .about-scale__stats {
    grid-template-columns: repeat(5, 1fr);
    gap: 14px;
  }

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

@media (min-width: 900px) {
  .page-about .about-section {
    padding-block: 92px;
  }

  .page-about .about-hero__grid {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    gap: 24px 56px;
    align-items: end;
    padding: 72px 0 64px;
  }

  .page-about .about-hero .breadcrumb {
    grid-column: 1 / -1;
    margin-bottom: 8px;
  }

  .page-about .about-hero__facts {
    margin: 0;
  }

  .page-about .about-hero__title {
    font-size: clamp(2.25rem, 4vw, 3.5rem);
  }

  .page-about .about-mission__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.95fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .about-scale__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: 48px;
    align-items: center;
  }

  .page-about .about-scale__team {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 48px;
    align-items: center;
  }
}

@media (max-width: 767px) {
  .page-about .stat-card:last-child {
    grid-column: 1 / -1;
  }
}