.page-about {
  --about-grid-line: rgba(57, 255, 20, 0.12);
  --about-green: var(--accent-green);
  --about-orange: var(--accent-orange);
  position: relative;
  background: linear-gradient(180deg, var(--primary) 0%, var(--primary-deep) 50%, var(--primary) 100%);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .breadcrumb {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 24px 0;
  display: flex;
  gap: 8px;
  font-size: 0.8125rem;
  color: var(--text-dim);
}

.page-about .breadcrumb a {
  color: var(--text-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .breadcrumb a:hover {
  color: var(--about-green);
  border-color: var(--about-green);
}

/* Hero */
.page-about .about-hero {
  position: relative;
  min-height: 480px;
  padding: 72px 24px 64px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  isolation: isolate;
}

.page-about .about-hero-grid {
  position: absolute;
  inset: 0;
  z-index: -1;
  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;
  -webkit-mask-image: radial-gradient(ellipse at center, rgba(0, 0, 0, 0.7), transparent 78%);
  mask-image: radial-gradient(ellipse at center, rgba(0, 0, 0, 0.7), transparent 78%);
}

.page-about .page-hero-kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--about-green);
  border: 1px solid rgba(57, 255, 20, 0.35);
  background: rgba(57, 255, 20, 0.07);
  padding: 6px 14px;
  margin: 0 0 20px;
}

.page-about .page-title {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(2.25rem, 6vw, 4.5rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
  text-shadow: 0 0 48px rgba(57, 255, 20, 0.12);
}

.page-about .page-sub {
  max-width: 720px;
  margin: 0 auto 32px;
  font-size: 1rem;
  color: var(--text-dim);
}

.page-about .about-hero-meta dl {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin: 0;
}

.page-about .about-hero-meta dl div {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 12px 20px;
  min-width: 148px;
}

.page-about .about-hero-meta dt {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.page-about .about-hero-meta dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--about-green);
}

/* Section 基底 */
.page-about .section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 72px 24px;
}

.page-about .section-kicker {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--about-orange);
  margin: 0 0 8px;
}

.page-about .section-title {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  line-height: 1.15;
  margin: 0 0 12px;
}

.page-about .section-sub {
  font-size: 1rem;
  color: var(--text-dim);
  max-width: 680px;
}

.page-about .lead {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--text);
  margin-bottom: 28px;
}

/* 品牌定位 */
.page-about .about-mission {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}

.page-about .about-mission-img-wrap {
  position: relative;
  min-height: 240px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(135deg, var(--primary-deep), var(--neutral));
}

.page-about .about-mission-img-wrap img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-mission-content .lead {
  margin-bottom: 28px;
}

.page-about .about-mission-points {
  display: grid;
  gap: 14px;
}

.page-about .about-point {
  position: relative;
  background: var(--surface);
  border-left: 3px solid var(--about-green);
  padding: 16px 18px 16px 20px;
}

.page-about .about-point-index {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--about-orange);
  margin-bottom: 4px;
}

.page-about .about-point h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin: 0 0 6px;
}

.page-about .about-point p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--text-dim);
}

/* 发展历程 */
.page-about .about-journey {
  position: relative;
  isolation: isolate;
}

.page-about .about-journey::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: radial-gradient(ellipse at 80% 20%, rgba(57, 255, 20, 0.05), transparent 60%);
  pointer-events: none;
}

.page-about .about-journey-head {
  position: relative;
  margin-bottom: 40px;
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--about-green) 0%, rgba(57, 255, 20, 0.15) 100%);
}

.page-about .about-timeline-item {
  position: relative;
  padding-left: 40px;
  padding-bottom: 32px;
}

.page-about .about-timeline-item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline-node {
  position: absolute;
  left: 0;
  top: 6px;
  width: 18px;
  height: 18px;
  background: var(--about-green);
  transform: rotate(45deg);
  box-shadow: 0 0 16px rgba(57, 255, 20, 0.45);
}

.page-about .about-timeline-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--line);
  padding: 18px 20px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.page-about .about-timeline-card:hover {
  transform: translateX(4px);
  border-color: rgba(57, 255, 20, 0.4);
}

.page-about .about-timeline-phase {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--about-orange);
  margin-bottom: 4px;
}

.page-about .about-timeline-card h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin: 0 0 6px;
}

.page-about .about-timeline-card p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--text-dim);
}

/* 服务数据 */
.page-about .about-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}

.page-about .about-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-stat-item {
  background: rgba(6, 18, 48, 0.6);
  border: 1px solid var(--line);
  border-top: 2px solid var(--about-green);
  padding: 16px 10px;
  text-align: center;
  clip-path: polygon(0 0, 100% 0, calc(100% - 10px) 100%, 10px 100%);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.page-about .about-stat-item:hover {
  transform: translateY(-2px);
  border-top-color: var(--about-orange);
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3.2vw, 2.2rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--about-green);
}

.page-about .about-stat-label {
  display: block;
  margin-top: 6px;
  font-size: 0.8125rem;
  color: var(--text-dim);
}

.page-about .about-stats-side {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
}

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

/* 技术能力 */
.page-about .about-tech {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: stretch;
}

.page-about .about-tech-bg {
  position: relative;
  min-height: 260px;
  overflow: hidden;
  border: 1px solid var(--line);
  order: 2;
  background: var(--primary-deep);
}

.page-about .about-tech-bg img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(0.35) contrast(1.08) brightness(0.82);
}

.page-about .about-tech-content {
  order: 1;
}

.page-about .about-tech-list {
  list-style: none;
  padding: 0;
  margin: 28px 0 0;
  display: grid;
  gap: 12px;
}

.page-about .about-tech-list li {
  display: flex;
  gap: 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 14px 16px;
}

.page-about .about-tech-index {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--about-orange);
  padding-top: 2px;
}

.page-about .about-tech-list h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  margin: 0 0 4px;
}

.page-about .about-tech-list p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-dim);
}

/* 合规声明 */
.page-about .about-compliance {
  position: relative;
  border-top: 1px solid var(--line);
}

.page-about .about-compliance-inner {
  max-width: 900px;
}

.page-about .about-compliance-grid {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.page-about .about-compliance-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line);
  border-left: 3px solid var(--about-orange);
  padding: 18px 20px;
}

.page-about .about-compliance-card h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  margin: 0 0 6px;
}

.page-about .about-compliance-card p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--text-dim);
}

.page-about .about-next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

/* 桌面端 */
@media (min-width: 768px) {
  .page-about .about-mission {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
  }

  .page-about .about-mission-img-wrap {
    min-height: 420px;
  }

  .page-about .about-mission-points {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .page-about .about-journey-head {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 24px;
    align-items: end;
  }

  .page-about .about-journey-head .section-sub {
    text-align: right;
  }

  .page-about .about-timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about .about-timeline-item {
    width: 50%;
    padding-left: 0;
    padding-right: 48px;
  }

  .page-about .about-timeline-item:nth-child(even) {
    margin-left: 50%;
    padding-left: 48px;
    padding-right: 0;
  }

  .page-about .about-timeline-node {
    left: auto;
    right: -9px;
  }

  .page-about .about-timeline-item:nth-child(even) .about-timeline-node {
    right: auto;
    left: -9px;
  }

  .page-about .about-stats {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
  }

  .page-about .about-stats-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
  }

  .page-about .about-tech {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 48px;
  }

  .page-about .about-tech-bg {
    order: 1;
    min-height: 420px;
  }

  .page-about .about-tech-content {
    order: 2;
  }

  .page-about .about-compliance-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }
}

/* 减少动态偏好 */
@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation: none !important;
    transition: none !important;
  }
}