.page-about {
  --about-grid-line: rgba(192, 192, 192, 0.16);
  --about-dark-line: rgba(192, 192, 192, 0.18);
  --about-panel-bg: #ffffff;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ===== 首屏：品牌档案 ===== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(120deg, var(--color-primary-dark) 0%, var(--color-primary) 60%, var(--color-primary-light) 100%);
  color: var(--color-text-inverse);
  padding: 7rem 0 4.5rem;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-line) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -2.5rem;
  bottom: 1.5rem;
  width: 11rem;
  height: 1.35rem;
  background: var(--color-accent);
  transform: rotate(-7deg);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.14);
  pointer-events: none;
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.25rem;
  position: relative;
  z-index: 1;
}

.page-about .about-hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.09em;
  color: var(--color-accent-light);
  text-transform: uppercase;
  margin: 0 0 1.25rem;
}

.page-about .about-hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2.8rem, 6vw, 4.7rem);
  line-height: 1.05;
  text-transform: uppercase;
  margin: 0 0 0.4rem;
}

.page-about .about-hero__sub {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  letter-spacing: 0.12em;
  color: var(--color-silver);
  margin: 0 0 1.5rem;
}

.page-about .about-hero__desc {
  max-width: 46em;
  color: rgba(255, 255, 255, 0.88);
  line-height: 1.8;
  margin: 0;
}

.page-about .about-hero__aside {
  display: flex;
}

.page-about .about-hero__card {
  width: 100%;
  border: 1px solid var(--about-dark-line);
  background: rgba(6, 13, 31, 0.55);
  backdrop-filter: blur(3px);
  padding: 1.15rem 1.1rem;
}

.page-about .about-hero__card-head {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  border-bottom: 1px solid var(--about-dark-line);
  padding-bottom: 0.65rem;
  margin-bottom: 0.6rem;
}

.page-about .about-hero__list {
  margin: 0;
  padding: 0;
}

.page-about .about-hero__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.35rem 0;
  border-bottom: 1px dashed rgba(192, 192, 192, 0.1);
}

.page-about .about-hero__row dt {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-silver);
}

.page-about .about-hero__row dd {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text-inverse);
  margin: 0;
}

/* ===== 页内目录 ===== */
.page-about .about-toc {
  margin: 1.75rem auto 0;
  padding: 1.1rem 1.25rem;
  background: var(--about-panel-bg);
  border: 1px solid var(--color-silver);
  border-left: 4px solid var(--color-accent);
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.page-about .about-toc__title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin: 0;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.page-about .about-toc__link {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-text-major);
  text-decoration: none;
  border: 1px solid var(--color-silver);
  padding: 0.35rem 0.7rem;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

/* ===== 品牌故事 ===== */
.page-about .about-story__body {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 2rem;
}

.page-about .about-story__lead {
  font-size: 1.2rem;
  line-height: 1.7;
  font-weight: 500;
  margin: 0;
}

.page-about .about-story__body p {
  line-height: 1.8;
  margin: 0;
}

.page-about .about-story__quote {
  margin: 0.75rem 0 0;
  padding: 1.1rem 1.35rem;
  border-left: 4px solid var(--color-accent);
  background: rgba(255, 107, 53, 0.07);
  font-weight: 500;
}

/* ===== 发展里程碑 ===== */
.page-about .about-milestones__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.75rem;
  align-items: start;
  margin-top: 2.5rem;
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0.25rem 0 0 1.6rem;
  border-left: 1px solid var(--color-silver);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 2.4rem 1.3rem;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0.4rem;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1.6rem - 4px);
  top: 0.5rem;
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 50%;
  box-shadow: 0 0 0 3px var(--color-background);
}

.page-about .about-timeline__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: rgba(255, 107, 53, 0.1);
  border: 1px solid rgba(255, 107, 53, 0.35);
  padding: 0.15rem 0.6rem;
  margin-bottom: 0.55rem;
}

.page-about .about-timeline__title {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  line-height: 1.2;
  text-transform: uppercase;
  margin: 0 0 0.4rem;
}

.page-about .about-timeline__text {
  font-size: 0.96rem;
  line-height: 1.7;
  margin: 0;
  color: var(--color-text-muted);
}

.page-about .about-milestones__fig {
  margin: 0;
  border: 1px solid var(--color-silver);
  box-shadow: var(--shadow-card);
  background: #fff;
}

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

.page-about .about-milestones__fig figcaption {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-text-muted);
  padding: 0.7rem 1rem;
  border-top: 1px solid var(--color-silver);
}

/* ===== 认证矩阵体系 ===== */
.page-about .about-accredit__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.15rem;
  margin-top: 2.75rem;
}

.page-about .about-accredit__card {
  position: relative;
  background: rgba(18, 59, 119, 0.32);
  border: 1px solid var(--about-dark-line);
  border-top: 3px solid var(--color-accent);
  padding: 1.5rem 1.2rem 1.3rem;
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-accredit__card:hover {
  transform: translateY(-3px);
  border-color: var(--color-accent);
  background: rgba(18, 59, 119, 0.5);
}

.page-about .about-accredit__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-accent-light);
  margin-bottom: 0.75rem;
}

.page-about .about-accredit__title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  text-transform: uppercase;
  margin: 0 0 0.6rem;
}

.page-about .about-accredit__card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.8);
}

.page-about .about-accredit__fig {
  margin: 2.5rem auto 0;
  max-width: 640px;
  border: 1px solid var(--about-dark-line);
  background: rgba(6, 13, 31, 0.35);
  padding: 0.75rem;
}

.page-about .about-accredit__fig img {
  display: block;
  object-fit: cover;
}

.page-about .about-accredit__fig figcaption {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-silver);
  text-align: center;
  padding: 0.7rem 0 0.25rem;
}

/* ===== 数据能力与规模 ===== */
.page-about .about-data__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 2.75rem;
}

.page-about .about-data__card {
  position: relative;
  background: var(--about-panel-bg);
  border: 1px solid var(--color-silver);
  box-shadow: var(--shadow-card);
  padding: 1.6rem 1.3rem;
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-data__card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent) 0%, rgba(255, 107, 53, 0.2) 100%);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.page-about .about-data__card:hover,
.page-about .about-data__card:focus-within {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-float);
}

.page-about .about-data__card:hover::before {
  opacity: 1;
}

.page-about .about-data__num {
  display: block;
  font-family: var(--font-heading);
  font-size: 2.9rem;
  font-weight: 600;
  line-height: 1;
  color: var(--color-primary);
  margin-bottom: 0.6rem;
}

.page-about .about-data__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  margin-bottom: 0.7rem;
}

.page-about .about-data__desc {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--color-text-major);
}

.page-about .about-data__footnote {
  margin: 2rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-silver);
  padding-top: 1rem;
}

/* ===== 团队与组织 ===== */
.page-about .about-team__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 2.75rem;
  align-items: center;
}

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

.page-about .about-team__card {
  border: 1px solid var(--color-silver);
  background: var(--about-panel-bg);
  box-shadow: var(--shadow-card);
  padding: 1.35rem 1.2rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-team__card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-float);
}

.page-about .about-team__count {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 600;
  line-height: 1;
  color: var(--color-accent);
}

.page-about .about-team__unit {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  margin-left: 0.2rem;
  color: var(--color-text-muted);
  font-weight: 400;
}

.page-about .about-team__role {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  text-transform: uppercase;
  margin: 0.4rem 0 0.4rem;
  color: var(--color-primary);
}

.page-about .about-team__card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--color-text-muted);
}

.page-about .about-team__fig {
  margin: 0;
  border: 1px solid var(--color-silver);
  box-shadow: var(--shadow-card);
  background: #fff;
}

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

.page-about .about-team__fig figcaption {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-text-muted);
  padding: 0.7rem 1rem;
  border-top: 1px solid var(--color-silver);
}

/* ===== 合作伙伴与荣誉 ===== */
.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.15rem;
  margin-top: 2.75rem;
}

.page-about .about-partners__col {
  border: 1px solid var(--color-silver);
  background: var(--about-panel-bg);
  box-shadow: var(--shadow-card);
  padding: 1.6rem 1.35rem;
}

.page-about .about-partners__title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-silver);
  padding-bottom: 0.6rem;
  margin-bottom: 1rem;
}

.page-about .about-partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-partners__list li {
  position: relative;
  padding: 0.38rem 0 0.38rem 1.2rem;
  font-size: 0.94rem;
  line-height: 1.5;
  color: var(--color-text-major);
}

.page-about .about-partners__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72rem;
  width: 0.55rem;
  height: 0.55rem;
  background: var(--color-accent);
  transform: rotate(45deg);
}

.page-about .about-partners__stat {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-primary);
  margin: 0 0 0.5rem;
}

.page-about .about-partners__desc {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--color-text-muted);
}

.page-about .about-partners__col--award {
  border-top: 4px solid var(--color-accent);
  background:
    linear-gradient(135deg, rgba(255, 107, 53, 0.08) 0%, rgba(255, 255, 255, 0) 50%),
    var(--about-panel-bg);
}

.page-about .about-partners__award {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  border: 1px solid rgba(255, 107, 53, 0.4);
  padding: 0.2rem 0.6rem;
  margin-bottom: 0.75rem;
}

.page-about .about-partners__award-title {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  text-transform: uppercase;
  color: var(--color-primary);
  margin: 0 0 0.5rem;
}

/* ===== 下一步引导 ===== */
.page-about .about-next__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.65rem;
}

.page-about .about-next__label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent-light);
  margin: 0;
}

.page-about .about-next__title {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 3.4vw, 2.5rem);
  line-height: 1.15;
  text-transform: uppercase;
  margin: 0 0 0.75rem;
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin-top: 0.5rem;
}

/* ===== 响应式增强 ===== */
@media (min-width: 640px) {
  .page-about .about-data__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }

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

  .page-about .about-toc {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: 7fr 4fr;
    gap: 3rem;
    align-items: center;
  }

  .page-about .about-milestones__grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 3.5rem;
  }

  .page-about .about-accredit__grid {
    grid-template-columns: repeat(4, 1fr);
  }

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

  .page-about .about-team__layout {
    grid-template-columns: 7fr 5fr;
    gap: 3rem;
  }
}