.page-about {
  overflow-x: hidden;
  background:
    radial-gradient(circle at 90% 8%, rgba(0, 255, 102, 0.06), transparent 30%),
    radial-gradient(circle at 10% 55%, rgba(255, 122, 0, 0.05), transparent 26%),
    var(--bg-primary);
}

.page-about [id] {
  scroll-margin-top: 100px;
}

.page-about a:focus-visible {
  outline: 2px solid var(--accent-green);
  outline-offset: 4px;
}

.page-about dd,
.page-about dt {
  margin: 0;
}

/* ===== 首屏封面区 ===== */
.page-about__cover {
  position: relative;
  min-height: 640px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 110px 0 56px;
  overflow: hidden;
  border-bottom: 1px solid var(--border-subtle);
}

.page-about__cover-bg {
  position: absolute;
  inset: 0;
  margin: 0;
  z-index: 0;
}

.page-about__cover-bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about__cover-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(10, 20, 40, 0.94) 0%, rgba(10, 20, 40, 0.78) 48%, rgba(10, 20, 40, 0.35) 100%),
    linear-gradient(180deg, rgba(10, 20, 40, 0.4) 0%, transparent 50%);
}

.page-about__cover-inner {
  position: relative;
  z-index: 1;
}

.page-about__cover .breadcrumb {
  margin-bottom: 72px;
}

.page-about__cover-grid {
  display: grid;
  gap: 36px;
}

.page-about__cover-title {
  max-width: 860px;
}

.page-about__cover .section__eyebrow {
  margin-bottom: 18px;
}

.page-about__cover h1 {
  margin: 0 0 24px;
  font-family: var(--font-sans);
  font-size: clamp(2.75rem, 8vw, 5.75rem);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.03em;
  max-width: 11ch;
}

.page-about__cover h1::after {
  content: "";
  display: block;
  width: 76px;
  height: 4px;
  margin-top: 26px;
  background: var(--accent-green);
}

.page-about__cover-lead {
  max-width: 60ch;
  margin: 0;
  color: var(--text-secondary);
  font-size: 1.0625rem;
  line-height: 1.7;
}

.page-about__cover-index {
  display: grid;
  gap: 6px;
  padding: 24px 0 0;
  border-top: 1px solid var(--border-subtle);
}

.page-about__cover-index-title {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  color: var(--accent-green);
  text-transform: uppercase;
}

.page-about__cover-index a {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 13px 16px;
  border-left: 2px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.9375rem;
  text-decoration: none;
  transition:
    color 0.2s var(--ease-out),
    border-color 0.2s var(--ease-out),
    background 0.2s var(--ease-out);
}

.page-about__cover-index a:hover {
  color: var(--text-primary);
  border-left-color: var(--accent-orange);
  background: rgba(0, 255, 102, 0.07);
}

.page-about__cover-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-orange);
  letter-spacing: 0.08em;
}

.page-about__section-num {
  margin-right: 8px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--accent-orange);
}

/* ===== 品牌使命 ===== */
.page-about__mission {
  padding: 72px 0 48px;
}

.page-about__mission .entry__content h2,
.page-about__certifications .entry__content h2 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.15;
  margin: 0 0 20px;
  letter-spacing: -0.02em;
}

.page-about__mission-lead {
  margin: 0 0 16px;
  color: var(--accent-green-light);
  font-weight: 700;
  font-size: 1.125rem;
}

.page-about__mission-text {
  margin: 0 0 40px;
  color: var(--text-secondary);
  line-height: 1.75;
  font-size: 1rem;
  max-width: 72ch;
}

.page-about__mission-text strong {
  color: var(--text-primary);
  font-weight: 700;
}

.page-about__mission-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

@media (min-width: 900px) {
  .page-about__mission-metrics {
    grid-template-columns: repeat(4, 1fr);
  }
}

.page-about__mission-metric {
  padding: 22px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.page-about__mission-metric-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--accent-green);
  margin-bottom: 8px;
  font-variant-numeric: tabular-nums;
}

.page-about__mission-metric-label {
  display: block;
  color: var(--text-secondary);
  font-size: 0.8125rem;
  line-height: 1.5;
}

/* ===== 关键数字墙 ===== */
.page-about__numbers {
  position: relative;
  padding: 88px 0;
  background:
    linear-gradient(120deg, rgba(0, 255, 102, 0.08), transparent 40%),
    var(--bg-elevated);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.page-about__numbers::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 100%;
  height: 10px;
  background: linear-gradient(110deg, transparent 40%, var(--accent-green) 40%, var(--accent-green) 52%, transparent 52%);
  opacity: 0.65;
}

.page-about__numbers-head {
  margin-bottom: 48px;
}

.page-about__numbers-grid {
  display: grid;
  grid-template-columns: 1fr;
  margin: 0;
  border-top: 1px solid var(--border-subtle);
}

@media (min-width: 720px) {
  .page-about__numbers-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1080px) {
  .page-about__numbers-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.page-about__numbers-item {
  padding: 34px 18px 30px;
  border-bottom: 1px solid var(--border-subtle);
  border-left: 1px solid var(--border-subtle);
  transition: background 0.2s var(--ease-out);
}

.page-about__numbers-item:hover {
  background: rgba(255, 255, 255, 0.03);
}

.page-about__numbers-item--hot .page-about__numbers-value {
  color: var(--accent-orange);
}

.page-about__numbers-value {
  display: block;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: clamp(2.75rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--accent-green);
  font-variant-numeric: tabular-nums;
}

.page-about__numbers-label {
  margin: 0 0 6px;
  font-weight: 700;
  color: var(--text-primary);
  font-size: 0.9375rem;
}

.page-about__numbers-meta {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* ===== 发展历程 ===== */
.page-about__milestones {
  padding: 72px 0 88px;
}

.page-about__milestones .section__head {
  margin-bottom: 56px;
}

.page-about__milestones-layout {
  display: grid;
  gap: 40px;
}

@media (min-width: 980px) {
  .page-about__milestones-layout {
    grid-template-columns: 7fr 4fr;
    align-items: start;
  }
}

.page-about__timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 32px;
  border-left: 1px solid var(--border-subtle);
}

.page-about__timeline-item {
  position: relative;
  padding: 0 0 44px;
}

.page-about__timeline-item:last-child {
  padding-bottom: 8px;
}

.page-about__timeline-item::before {
  content: "";
  position: absolute;
  left: -37px;
  top: 4px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent-orange);
  box-shadow: 0 0 0 5px rgba(255, 122, 0, 0.16);
  transition:
    transform 0.2s var(--ease-out),
    box-shadow 0.2s var(--ease-out);
}

.page-about__timeline-item:hover::before {
  transform: scale(1.4);
  box-shadow: 0 0 0 8px rgba(255, 122, 0, 0.22);
}

.page-about__timeline-gen {
  display: inline-block;
  margin-bottom: 10px;
  padding: 5px 10px;
  border: 1px solid rgba(0, 255, 102, 0.35);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--accent-green);
}

.page-about__timeline h3 {
  margin: 0 0 8px;
  font-size: 1.25rem;
  font-weight: 800;
}

.page-about__timeline p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
  max-width: 54ch;
}

.page-about__milestones-note {
  padding: 30px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
}

@media (min-width: 980px) {
  .page-about__milestones-note {
    position: sticky;
    top: 110px;
  }
}

.page-about__milestones-note-label {
  display: inline-block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--accent-green);
  text-transform: uppercase;
}

.page-about__milestones-note p {
  margin: 0 0 18px;
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.page-about__milestones-link {
  display: inline-flex;
  gap: 6px;
  align-items: center;
  color: var(--accent-green);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition:
    border-color 0.2s var(--ease-out),
    color 0.2s var(--ease-out);
}

.page-about__milestones-link:hover {
  color: var(--accent-green-light);
  border-color: currentColor;
}

/* ===== 资质认证 ===== */
.page-about__certifications {
  padding: 72px 0 88px;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.page-about__certifications .entry__content h2 {
  margin-top: 0;
  margin-bottom: 12px;
}

.page-about__cert-lead {
  margin: 0 0 36px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.page-about__cert-grid {
  display: grid;
  gap: 32px;
  align-items: start;
}

@media (min-width: 900px) {
  .page-about__cert-grid {
    grid-template-columns: 5fr 7fr;
  }
}

.page-about__cert-fig {
  margin: 0;
}

.page-about__cert-fig img {
  display: block;
  width: 100%;
  max-width: 400px;
  height: auto;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  transition:
    box-shadow 0.25s var(--ease-out),
    border-color 0.25s var(--ease-out),
    transform 0.25s var(--ease-out);
}

.page-about__cert-fig:hover img {
  border-color: var(--accent-green);
  box-shadow: 0 8px 32px rgba(0, 255, 102, 0.12);
  transform: translateY(-4px);
}

.page-about__cert-fig figcaption {
  margin-top: 12px;
  color: var(--text-secondary);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
}

.page-about__cert-list {
  display: grid;
  gap: 18px;
}

.page-about__cert-item {
  padding: 24px 26px;
  background: var(--bg-card);
  border-left: 3px solid var(--accent-orange);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  transition:
    border-color 0.2s var(--ease-out),
    transform 0.2s var(--ease-out);
}

.page-about__cert-item:hover {
  border-left-color: var(--accent-green);
  transform: translateX(4px);
}

.page-about__cert-item h3 {
  margin: 0 0 8px;
  font-size: 1.0625rem;
  font-weight: 800;
}

.page-about__cert-item p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.9063rem;
  line-height: 1.65;
}

/* ===== 团队与组织 ===== */
.page-about__team {
  padding: 88px 0;
}

.page-about__team-layout {
  display: grid;
  gap: 40px;
  align-items: center;
}

@media (min-width: 900px) {
  .page-about__team-layout {
    grid-template-columns: 5fr 7fr;
  }
}

.page-about__team-fig {
  position: relative;
  margin: 0;
}

.page-about__team-fig::after {
  content: "";
  position: absolute;
  left: 16px;
  top: 16px;
  width: 100%;
  height: 100%;
  border: 1px solid rgba(0, 255, 102, 0.3);
  border-radius: var(--radius-lg);
  z-index: -1;
}

.page-about__team-fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 5;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
}

.page-about__team-content .section__eyebrow {
  margin-bottom: 14px;
}

.page-about__team-content h2 {
  margin: 0 0 16px;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.page-about__team-lead {
  margin: 0 0 32px;
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 1.0625rem;
  max-width: 46ch;
}

.page-about__team-groups {
  display: grid;
  gap: 18px;
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
}

.page-about__team-group {
  padding: 20px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.page-about__team-group-tag {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--accent-green);
}

.page-about__team-group p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.9063rem;
  line-height: 1.65;
}

.page-about__team-note {
  margin: 0;
  padding-left: 18px;
  border-left: 3px solid var(--accent-orange);
  color: var(--text-primary);
  font-size: 0.9063rem;
  line-height: 1.6;
}

/* ===== 结尾斜切色块 CTA ===== */
.page-about__closing {
  position: relative;
  padding: 88px 0;
}

.page-about__closing::before {
  content: "";
  position: absolute;
  left: 0;
  top: -5%;
  width: 100%;
  height: 110%;
  background: var(--accent-green);
  transform: skewY(-2deg);
  transform-origin: left center;
  z-index: 0;
}

.page-about__closing::after {
  content: "";
  position: absolute;
  left: 0;
  top: -5%;
  width: 100%;
  height: 110%;
  background-image: linear-gradient(115deg, rgba(10, 20, 40, 0.08) 25%, transparent 25%, transparent 50%, rgba(10, 20, 40, 0.08) 50%, rgba(10, 20, 40, 0.08) 75%, transparent 75%);
  background-size: 44px 44px;
  transform: skewY(-2deg);
  transform-origin: left center;
  z-index: 0;
}

.page-about__closing-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 36px;
}

@media (min-width: 860px) {
  .page-about__closing-inner {
    grid-template-columns: 6fr 6fr;
    align-items: center;
  }
}

.page-about__closing-copy .section__eyebrow {
  color: var(--bg-primary);
}

.page-about__closing-copy h2 {
  margin: 0 0 14px;
  color: var(--bg-primary);
  font-size: clamp(1.75rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.page-about__closing-lead {
  margin: 0;
  color: rgba(10, 20, 40, 0.75);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.page-about__closing-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: flex-start;
}

.page-about__closing-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  font-weight: 800;
  font-size: 0.9rem;
  padding: 14px 22px;
  text-decoration: none;
  border: 1px solid transparent;
  transition:
    transform 0.2s var(--ease-out),
    background 0.2s var(--ease-out),
    border-color 0.2s var(--ease-out);
}

.page-about__closing-btn--solid {
  background: var(--bg-primary);
  color: var(--accent-green);
}

.page-about__closing-btn--outline {
  border-color: rgba(10, 20, 40, 0.4);
  color: var(--bg-primary);
  background: transparent;
}

.page-about__closing-btn--ghost {
  color: var(--bg-primary);
  background: transparent;
}

.page-about__closing-btn:hover {
  transform: translateY(-2px);
}

.page-about__closing-btn--solid:hover {
  background: var(--bg-card);
}

.page-about__closing-btn--outline:hover,
.page-about__closing-btn--ghost:hover {
  border-color: var(--bg-primary);
  background: rgba(255, 255, 255, 0.18);
}

/* ===== 移动端首屏索引对齐 ===== */
@media (max-width: 719px) {
  .page-about__cover {
    min-height: 560px;
    padding-top: 90px;
  }

  .page-about__cover .breadcrumb {
    margin-bottom: 48px;
  }

  .page-about__cover-grid {
    gap: 28px;
  }

  .page-about__cover-index {
    padding: 18px 0 0;
  }

  .page-about__mission-metrics {
    grid-template-columns: 1fr;
  }

  .page-about__closing-links .btn {
    width: 100%;
  }
}