.page-about {
  --about-cut: 16px;
  --about-radius: 16px;
  position: relative;
  background:
    radial-gradient(circle at 85% 10%, rgba(212, 160, 23, 0.12), transparent 360px),
    linear-gradient(180deg, var(--color-deep) 0%, var(--color-night) 100%);
  color: var(--color-white);
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .breadcrumb {
  margin-top: 24px;
  color: var(--color-silver);
  font-size: 14px;
}
.page-about .breadcrumb__link {
  color: var(--color-silver);
  text-decoration: none;
  transition: color 0.2s ease;
}
.page-about .breadcrumb__link:hover {
  color: var(--color-gold);
}
.page-about .breadcrumb__sep {
  margin: 0 8px;
  color: var(--color-gold);
  font-family: var(--font-mono);
}

/* 01 品牌故事 */
.page-about .brand-hero {
  position: relative;
  padding: 40px 0 56px;
}
.page-about .brand-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 46%;
  height: 420px;
  background: repeating-linear-gradient(135deg, transparent 0 40px, rgba(212, 160, 23, 0.08) 40px 56px);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 72%);
  pointer-events: none;
}
.page-about .brand-hero__layout {
  display: grid;
  gap: 28px;
  align-items: center;
  position: relative;
  z-index: 1;
}
.page-about .brand-hero__content {
  max-width: 640px;
}
.page-about .brand-hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 6vw, 4.25rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 16px 0 20px;
}
.page-about .brand-hero__title span {
  display: block;
}
.page-about .brand-hero__title-sub {
  color: var(--color-gold);
  margin-top: 4px;
}
.page-about .brand-hero__lead {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--color-gold);
  border-left: 3px solid var(--color-gold);
  padding-left: 16px;
  margin: 0 0 16px;
}
.page-about .brand-hero__body {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-silver);
  margin: 0 0 28px;
}
.page-about .brand-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
.page-about .brand-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}
.page-about .brand-hero__visual {
  margin: 0;
  position: relative;
  border-radius: var(--about-radius);
  overflow: hidden;
  isolation: isolate;
  background: var(--color-night);
}
.page-about .brand-hero__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 2px solid rgba(212, 160, 23, 0.6);
  border-radius: var(--about-radius);
  transform: translate(14px, 14px);
  z-index: -1;
}
.page-about .brand-hero__img {
  width: 100%;
  height: auto;
  object-fit: cover;
  display: block;
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}
.page-about .brand-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 48px;
  padding: 0;
}
.page-about .brand-hero__stat {
  background: rgba(26, 42, 74, 0.72);
  border-left: 3px solid var(--color-gold);
  padding: 18px 16px;
  border-radius: 0 12px 12px 0;
}
.page-about .brand-hero__stat dt {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--color-silver);
  text-transform: uppercase;
  margin-bottom: 6px;
}
.page-about .brand-hero__stat dd {
  font-family: var(--font-heading);
  font-size: 2rem;
  line-height: 1;
  color: var(--color-gold);
  margin: 0;
}
.page-about .brand-hero__stat dd small {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--color-silver);
  margin-left: 6px;
}

/* 02 发展历程 */
.page-about .journey {
  padding: 80px 0 24px;
  position: relative;
}
.page-about .journey::before {
  content: "TRACK";
  position: absolute;
  top: 20px;
  right: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.4em;
  color: rgba(176, 184, 200, 0.35);
  writing-mode: vertical-rl;
}
.page-about .section-head {
  margin-bottom: 48px;
}
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  max-width: 720px;
}
.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 70px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-gold) 0%, var(--color-green) 100%);
  transform: translateX(-50%);
}
.page-about .timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 16px;
  padding-bottom: 48px;
}
.page-about .timeline__item:nth-child(2) {
  padding-bottom: 42px;
}
.page-about .timeline__item:nth-child(3) {
  padding-bottom: 36px;
}
.page-about .timeline__item:nth-child(4) {
  padding-bottom: 28px;
}
.page-about .timeline__item--last {
  padding-bottom: 0;
}
.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 70px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-deep);
  border: 3px solid var(--color-gold);
  transform: translateX(-50%);
  z-index: 1;
  transition: background 0.2s ease, box-shadow 0.2s ease;
}
.page-about .timeline__item:hover::before {
  background: var(--color-gold);
  box-shadow: 0 0 0 6px rgba(212, 160, 23, 0.22);
}
.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-gold);
  text-align: right;
  padding-top: 2px;
}
.page-about .timeline__panel {
  background: var(--color-night);
  border: 1px solid rgba(212, 160, 23, 0.25);
  border-top: 3px solid var(--color-gold);
  border-radius: 0 12px 12px 12px;
  padding: 18px 18px 16px;
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.page-about .timeline__item:hover .timeline__panel {
  transform: translateX(6px);
  border-color: rgba(212, 160, 23, 0.7);
  background: var(--color-deep);
}
.page-about .timeline__panel h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 1.15rem;
  color: var(--color-white);
  transition: font-size 0.2s ease;
}
.page-about .timeline__item:nth-child(2) .timeline__panel h3 {
  font-size: 1.2rem;
}
.page-about .timeline__item:nth-child(3) .timeline__panel h3 {
  font-size: 1.25rem;
}
.page-about .timeline__item:nth-child(4) .timeline__panel h3 {
  font-size: 1.3rem;
}
.page-about .timeline__item--last .timeline__panel h3 {
  font-size: 1.35rem;
}
.page-about .timeline__panel p {
  margin: 0 0 12px;
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--color-silver);
}

/* 03 数据团队 */
.page-about .team-section {
  padding: 80px 0 32px;
  position: relative;
}
.page-about .team-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-gold) 0%, transparent 40%, var(--color-green) 100%);
  opacity: 0.7;
}
.page-about .team-section__head {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 40px;
}
.page-about .team-section__summary {
  max-width: 620px;
  color: var(--color-silver);
  line-height: 1.7;
  margin: 0;
}
.page-about .team-section__layout {
  display: grid;
  gap: 32px;
}
.page-about .team-section__intro {
  display: grid;
  gap: 24px;
}
.page-about .team-section__scale {
  padding: 24px;
  border-radius: var(--about-radius);
}
.page-about .team-section__scale h3 {
  margin: 0 0 16px;
  font-family: var(--font-heading);
  font-size: 1.3rem;
  color: var(--color-white);
}
.page-about .team-section__scale-list {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .team-section__scale-list li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  color: var(--color-white);
  font-size: 1rem;
}
.page-about .team-section__scale-list .over-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.6rem;
  color: var(--color-gold);
}
.page-about .team-section__scale p {
  margin: 0;
  color: var(--color-silver);
  font-size: 0.9rem;
  line-height: 1.6;
}
.page-about .team-section__figure {
  margin: 0;
  border-radius: var(--about-radius);
  overflow: hidden;
  position: relative;
}
.page-about .team-section__figure img {
  width: 100%;
  height: auto;
  display: block;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}
.page-about .team-section__figure figcaption {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-silver);
  background: rgba(10, 30, 63, 0.85);
  padding: 8px 12px;
  position: absolute;
  bottom: 8px;
  left: 8px;
  border-left: 2px solid var(--color-gold);
  border-radius: 0 4px 4px 0;
}
.page-about .team-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.page-about .team-grid__item {
  background: var(--color-night);
  border-radius: var(--about-radius);
  padding: 20px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  border-bottom: 3px solid rgba(212, 160, 23, 0.4);
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}
.page-about .team-grid__item:hover {
  background: var(--color-deep);
  border-bottom-color: var(--color-gold);
  transform: translateY(-4px);
}
.page-about .team-grid__icon {
  flex: 0 0 48px;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--color-deep);
  border: 1px solid rgba(212, 160, 23, 0.5);
  color: var(--color-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: 600px;
  transition: transform 0.45s ease, background 0.2s ease, color 0.2s ease;
}
.page-about .team-grid__item:hover .team-grid__icon {
  transform: rotateY(180deg);
  background: var(--color-gold);
  color: var(--color-deep);
}
.page-about .team-grid__content h3 {
  margin: 0 0 6px;
  font-family: var(--font-heading);
  font-size: 1.05rem;
  color: var(--color-white);
}
.page-about .team-grid__content p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--color-silver);
}

/* 04 资质与荣誉 */
.page-about .credential {
  padding: 80px 0 60px;
  position: relative;
}
.page-about .credential::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent, rgba(212, 160, 23, 0.06) 60%, transparent);
  pointer-events: none;
}
.page-about .credential__head {
  margin-bottom: 40px;
}
.page-about .credential__layout {
  display: grid;
  gap: 40px;
}
.page-about .credential__cards {
  display: grid;
  gap: 20px;
}
.page-about .credential__card {
  padding: 24px;
  border-radius: var(--about-radius);
  border-left: 3px solid var(--color-gold);
}
.page-about .credential__card h3 {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  color: var(--color-white);
}
.page-about .credential__icp {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-gold);
  margin: 4px 0 10px;
}
.page-about .credential__card p {
  color: var(--color-silver);
  font-size: 0.95rem;
  line-height: 1.6;
  margin: 0 0 12px;
}
.page-about .credential__link {
  color: var(--color-green);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1px solid rgba(46, 204, 113, 0.4);
  transition: color 0.2s ease, border-color 0.2s ease;
}
.page-about .credential__link:hover {
  color: var(--color-gold);
  border-color: var(--color-gold);
}
.page-about .credential__card details {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid rgba(176, 184, 200, 0.2);
}
.page-about .credential__card summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  color: var(--color-gold);
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color 0.2s ease;
}
.page-about .credential__card summary:hover {
  color: var(--color-bronze);
}
.page-about .credential__card summary::-webkit-details-marker {
  display: none;
}
.page-about .credential__card summary::before {
  content: "+";
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
}
.page-about .credential__card details[open] summary::before {
  content: "−";
}
.page-about .credential__card details p {
  font-size: 0.9rem;
  color: var(--color-silver);
  line-height: 1.65;
  margin: 12px 0 0;
}
.page-about .credential__figure {
  margin: 0;
  position: relative;
  border-radius: var(--about-radius);
  overflow: hidden;
}
.page-about .credential__figure img {
  width: 100%;
  height: auto;
  display: block;
  clip-path: polygon(var(--about-cut) 0, 100% 0, 100% 100%, 0 calc(100% - var(--about-cut)));
}
.page-about .credential__figure figcaption {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-white);
  background: var(--color-deep);
  padding: 8px 12px;
  position: absolute;
  top: 12px;
  right: 12px;
  border-bottom: 2px solid var(--color-gold);
}

/* 联系入口 */
.page-about .brand-cta {
  padding: 24px 0 80px;
}
.page-about .brand-cta__inner {
  background: linear-gradient(135deg, var(--color-night), var(--color-deep));
  border-top: 3px solid var(--color-gold);
  border-radius: 0 24px 24px 0;
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: flex-start;
}
.page-about .brand-cta__title {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  line-height: 1.2;
  margin: 0;
  color: var(--color-white);
}
.page-about .brand-cta__text {
  color: var(--color-silver);
  margin: 0;
  line-height: 1.6;
  max-width: 560px;
}
.page-about .brand-cta__inner .btn {
  margin-top: 8px;
}

/* 响应式 */
@media (min-width: 600px) {
  .page-about .brand-hero__stats {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .team-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .page-about .brand-hero__layout {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
  }
  .page-about .brand-hero__content {
    padding-top: 24px;
  }
  .page-about .brand-hero__visual {
    margin-top: 24px;
  }
  .page-about .timeline__item {
    grid-template-columns: 110px 1fr;
    gap: 28px;
  }
  .page-about .timeline::before,
  .page-about .timeline__item::before {
    left: 110px;
  }
  .page-about .team-section__head {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-end;
  }
  .page-about .team-section__layout {
    grid-template-columns: 0.85fr 1.15fr;
    align-items: start;
    gap: 40px;
  }
  .page-about .team-section__intro {
    grid-template-columns: 1fr;
  }
  .page-about .credential__layout {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
  }
  .page-about .brand-cta__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
  }
  .page-about .brand-cta__inner .btn {
    flex-shrink: 0;
  }
}