.page-about {
  --about-line: rgba(255, 255, 255, 0.14);
  --about-card-bg: rgba(255, 255, 255, 0.05);
  --about-card-border: rgba(255, 255, 255, 0.16);
  position: relative;
  background: var(--c-navy);
  color: var(--c-white);
  overflow: hidden;
}

.page-about .tech-grid {
  position: absolute;
  inset: 0;
  opacity: 0.7;
  pointer-events: none;
  z-index: 0;
}

.page-about > section {
  position: relative;
  z-index: 1;
}

.page-about .section {
  padding: 72px 0;
}

@media (min-width: 768px) {
  .page-about .section {
    padding: 96px 0;
  }
}

/* 首屏：无传统 Hero，直接进入标题与索引 */
.page-about .about-intro {
  padding-top: 48px;
  padding-bottom: 40px;
}

.page-about .about-intro::before {
  content: '';
  position: absolute;
  inset: auto 0 0 0;
  height: 160px;
  pointer-events: none;
  background: repeating-linear-gradient(
    -45deg,
    rgba(255, 255, 255, 0.045) 0 12px,
    transparent 12px 24px
  );
  mask-image: linear-gradient(to bottom, transparent, #000);
  -webkit-mask-image: linear-gradient(to bottom, transparent, #000);
}

.page-about .about-intro-grid {
  display: grid;
  gap: 36px;
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 992px) {
  .page-about .about-intro-grid {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 56px;
    align-items: start;
  }
}

.page-about .about-intro-copy {
  position: relative;
  z-index: 1;
}

.page-about .page-kicker {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-orange);
  margin: 0 0 12px;
}

.page-about .page-title {
  font-family: var(--font-heading);
  font-size: clamp(2.4rem, 7vw, 4.4rem);
  line-height: 1.04;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--c-white);
  margin: 0 0 18px;
  max-width: 820px;
}

.page-about .page-desc {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--c-gray);
  max-width: 660px;
  margin: 0;
}

@media (min-width: 768px) {
  .page-about .page-desc {
    font-size: 1.08rem;
  }
}

/* 目录索引卡 */
.page-about .about-index {
  position: relative;
  z-index: 1;
}

.page-about .about-index-card {
  background: var(--c-space);
  border: 1px solid var(--about-card-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.page-about .about-index-title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-green);
  margin: 0 0 16px;
}

.page-about .about-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 4px;
}

.page-about .about-index-list a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 9px 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-white);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition: color 0.3s var(--ease-out);
}

.page-about .about-index-list a span {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-orange);
  min-width: 24px;
}

.page-about .about-index-list a:hover {
  color: var(--c-green);
}

/* 首屏数据指标 */
.page-about .about-metrics {
  margin-top: 48px;
}

.page-about .about-metrics .dash-card {
  padding: 22px 24px;
  background: var(--about-card-bg);
  border: 1px solid var(--about-card-border);
  border-radius: var(--radius-md);
  display: grid;
  gap: 6px;
}

.page-about .about-metrics .dash-card__value {
  color: var(--c-white);
  font-size: 2.2rem;
  line-height: 1;
}

.page-about .about-metrics .about-metric-green {
  color: var(--c-green);
}

.page-about .dash-card__hint {
  font-size: 12px;
  color: var(--c-gray);
  margin: 0;
}

/* 分区标题 */
.page-about .section-head {
  max-width: 720px;
  margin-bottom: 44px;
}

.page-about .about-section-index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--c-green);
  border: 1px solid rgba(57, 255, 20, 0.42);
  border-radius: var(--radius-pill);
  padding: 4px 14px;
  margin-bottom: 16px;
}

.page-about .section-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.06;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--c-white);
  margin: 0 0 14px;
}

.page-about .section-desc {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--c-gray);
  margin: 0;
}

/* 时间线 */
.page-about .about-timeline {
  position: relative;
  max-width: 880px;
  margin: 0 auto 36px;
  padding-top: 8px;
}

.page-about .about-timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 18px;
  bottom: 18px;
  width: 2px;
  border-radius: var(--radius-pill);
  background: linear-gradient(
    to bottom,
    var(--c-green) 0%,
    rgba(57, 255, 20, 0.4) 30%,
    rgba(255, 107, 53, 0.4) 70%,
    var(--c-orange) 100%
  );
}

.page-about .timeline-item {
  position: relative;
  padding-left: 48px;
  margin-bottom: 28px;
}

.page-about .timeline-marker {
  position: absolute;
  left: 0;
  top: 24px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--c-navy);
  border: 3px solid var(--c-green);
  box-shadow: 0 0 0 6px rgba(57, 255, 20, 0.12);
}

.page-about .timeline-marker span {
  position: absolute;
  inset: 3px;
  border-radius: 50%;
  background: var(--c-green);
}

.page-about .timeline-card {
  background: var(--about-card-bg);
  border: 1px solid var(--about-card-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: border-color 0.3s var(--ease-out), background 0.3s var(--ease-out);
}

.page-about .timeline-card:hover {
  border-color: rgba(57, 255, 20, 0.45);
  background: rgba(255, 255, 255, 0.08);
}

.page-about .timeline-tag {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.page-about .tl-num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--c-gray);
}

.page-about .timeline-card h3 {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--c-white);
  margin: 0 0 10px;
}

.page-about .timeline-card p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-gray);
  margin: 0 0 18px;
}

.page-about .tl-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* 时间线图片说明 */
.page-about .timeline-media {
  display: grid;
  gap: 20px;
  max-width: 880px;
  margin: 36px auto 0;
  align-items: center;
}

@media (min-width: 768px) {
  .page-about .timeline-media {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: 32px;
  }
}

.page-about .timeline-caption p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-gray);
  margin: 14px 0 0;
}

/* 图片容器 */
.page-about .about-media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-card-border);
  background: var(--c-space);
}

.page-about .about-media-frame--58 {
  aspect-ratio: 8 / 5;
}

.page-about .about-media-frame--wide {
  aspect-ratio: 2 / 1;
}

.page-about .about-media-frame--glow {
  border-color: rgba(57, 255, 20, 0.3);
}

.page-about .about-media-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  max-width: 100%;
}

/* 技术引擎 */
.page-about .about-engine {
  padding-top: 0;
}

.page-about .engine-grid {
  display: grid;
  gap: 48px;
  align-items: start;
}

@media (min-width: 992px) {
  .page-about .engine-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 64px;
    align-items: center;
  }
}

.page-about .engine-step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  padding: 24px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .engine-step__num {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 800;
  color: var(--c-orange);
  line-height: 1.4;
}

.page-about .engine-step h3 {
  font-family: var(--font-heading);
  font-size: 1.45rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--c-white);
  margin: 0 0 6px;
}

.page-about .engine-step p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-gray);
  margin: 0;
}

.page-about .data-features {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .data-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  color: var(--c-white);
}

.page-about .data-features .pulse-dot {
  flex: 0 0 auto;
}

/* 资质认证 */
.page-about .about-cert {
  background: var(--c-space);
}

.page-about .cert-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .page-about .cert-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.page-about .cert-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--about-card-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: transform 0.35s var(--ease-out), border-color 0.35s var(--ease-out);
}

.page-about .cert-card:hover {
  transform: translateY(-4px);
  border-color: var(--c-cyan);
}

.page-about .cert-icon {
  color: var(--c-cyan);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-pill);
  background: rgba(15, 255, 255, 0.1);
}

.page-about .cert-card h3 {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--c-white);
  margin: 18px 0 10px;
}

.page-about .cert-card p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-gray);
  margin: 0;
}

.page-about .awards-row {
  display: grid;
  gap: 12px;
  margin-top: 36px;
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .page-about .awards-row {
    grid-template-columns: repeat(3, 1fr);
  }
}

.page-about .award-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--about-card-border);
  background: rgba(255, 255, 255, 0.04);
}

.page-about .award-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--c-white);
}

/* 合作生态：浅色对比区 */
.page-about .about-eco {
  background: var(--c-cloud);
  color: var(--c-navy);
}

.page-about .about-eco .section-title {
  color: var(--c-navy);
}

.page-about .about-eco .section-desc {
  color: var(--c-gray);
}

.page-about .about-eco .about-section-index--dark {
  border-color: rgba(10, 31, 68, 0.4);
  color: var(--c-navy);
}

.page-about .eco-layout {
  display: grid;
  gap: 40px;
  align-items: start;
}

@media (min-width: 992px) {
  .page-about .eco-layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 64px;
  }
}

.page-about .eco-points {
  display: grid;
  gap: 20px;
}

.page-about .eco-point {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid rgba(10, 31, 68, 0.12);
}

.page-about .eco-point__num {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 800;
  color: var(--c-orange);
  line-height: 1.5;
}

.page-about .eco-point h3 {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--c-navy);
  margin: 0 0 6px;
}

.page-about .eco-point p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-gray);
  margin: 0;
}

.page-about .eco-note-card {
  background: var(--c-navy);
  color: var(--c-white);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: 0 24px 48px rgba(10, 31, 68, 0.18);
}

.page-about .eco-note-kicker {
  display: block;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--c-orange);
  margin: 0 0 10px;
}

.page-about .eco-note-card h3 {
  font-family: var(--font-heading);
  font-size: 1.9rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--c-white);
  margin: 0 0 12px;
}

.page-about .eco-note-card p {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.78);
  margin: 0 0 20px;
}

.page-about .eco-list {
  list-style: none;
  margin: 0 0 26px;
  padding: 18px 0 0;
  display: grid;
  gap: 10px;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}

.page-about .eco-list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 14px;
  color: rgba(255, 255, 255, 0.84);
}

.page-about .eco-list strong {
  font-size: 15px;
  font-weight: 800;
  color: var(--c-white);
}

/* 团队与服务理念 */
.page-about .about-team {
  background: var(--c-navy);
}

.page-about .team-grid {
  display: grid;
  gap: 48px;
  margin-bottom: 48px;
}

@media (min-width: 992px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 64px;
    align-items: start;
  }
}

.page-about .team-metrics {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}

@media (min-width: 600px) {
  .page-about .team-metrics {
    grid-template-columns: 1fr 1fr;
  }
}

.page-about .team-stat {
  background: var(--about-card-bg);
  border: 1px solid var(--about-card-border);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
}

.page-about .team-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1;
  color: var(--c-green);
}

.page-about .team-stat__label {
  display: block;
  margin-top: 10px;
  font-size: 14px;
  color: var(--c-gray);
}

.page-about .principle-item {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .principle-item:last-child {
  border-bottom: none;
}

.page-about .principle-icon {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 800;
  color: var(--c-orange);
  line-height: 1.5;
}

.page-about .principle-item h3 {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--c-white);
  margin: 0 0 6px;
}

.page-about .principle-item p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-gray);
  margin: 0;
}

.page-about .team-image {
  margin-bottom: 40px;
}

.page-about .trust-cta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 20px;
  padding: 28px;
  background: var(--c-space);
  border-radius: var(--radius-lg);
}

@media (min-width: 768px) {
  .page-about .trust-cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
  }
}

.page-about .trust-cta-left {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 520px;
}

.page-about .trust-cta-left p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-white);
  margin: 0;
}

.page-about .trust-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .cert-card,
  .page-about .timeline-card,
  .page-about .about-index-list a,
  .page-about [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}