.page-about {
  --about-cut: 12px;
  --about-line-soft: rgba(0, 191, 255, 0.12);
  background: var(--navy);
  color: var(--white);
}

/* ===== 首屏档案 ===== */
.about-hero {
  position: relative;
  padding: clamp(76px, 10vh, 112px) 0 44px;
  overflow: hidden;
}
.about-hero::before,
.about-hero::after {
  content: "";
  position: absolute;
  pointer-events: none;
}
.about-hero::before {
  inset: 0;
  background:
    linear-gradient(135deg, rgba(0, 191, 255, 0.07) 0%, transparent 42%),
    linear-gradient(315deg, rgba(255, 74, 28, 0.10) 0%, transparent 34%);
}
.about-hero::after {
  top: 0;
  right: 0;
  width: 44%;
  height: 100%;
  background: repeating-linear-gradient(-45deg, rgba(0, 191, 255, 0.09) 0 2px, transparent 2px 14px);
  clip-path: polygon(24% 0, 100% 0, 100% 100%, 0 100%);
}
.about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}
.about-hero-copy {
  max-width: 640px;
}
.about-hero-eyebrow {
  margin: 18px 0 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--blue);
}
.about-hero h1 {
  margin: 0 0 16px;
  font-family: var(--font-heading);
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.16;
  font-weight: 900;
}
.about-hero-title-accent {
  color: var(--blue);
}
.about-hero-lead {
  margin: 0 0 26px;
  color: var(--gray-blue);
  font-size: 16px;
  line-height: 1.75;
}
.about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.about-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.stat-card {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
  min-height: 118px;
  padding: 20px 18px;
  background: var(--navy-card);
  border: 1px solid rgba(255, 255, 255, 0.06);
  overflow: hidden;
}
.stat-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--blue);
}
.stat-card--orange::before {
  background: var(--orange);
}
.stat-card-number {
  font-family: var(--font-mono);
  font-size: clamp(32px, 5vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--white);
}
.stat-card-label {
  font-size: 13px;
  line-height: 1.4;
  letter-spacing: 0.5px;
  color: var(--gray-blue);
}

/* ===== 品牌使命 ===== */
.about-mission-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
  margin-top: 32px;
}
.about-mission-text {
  margin: 0 0 16px;
  color: var(--gray-blue);
  line-height: 1.75;
  font-size: 15px;
}
.about-mission-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.about-mission-list li {
  position: relative;
  padding-left: 22px;
  color: var(--white);
  font-size: 15px;
  line-height: 1.5;
}
.about-mission-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 10px;
  height: 2px;
  background: var(--orange);
}
.about-mission-visual {
  position: relative;
  margin: 0;
}
.about-mission-visual img {
  display: block;
  width: 100%;
  height: auto;
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 0 100%);
}
.about-mission-visual figcaption,
.timeline-picture-caption {
  margin-top: 10px;
  padding-left: 12px;
  border-left: 3px solid var(--blue);
  font-size: 13px;
  color: var(--gray-blue);
}

/* ===== 发展历程时间轴 ===== */
.about-timeline {
  position: relative;
  max-width: 880px;
  margin: 40px auto 0;
  padding-bottom: 8px;
}
.about-timeline::before {
  content: "";
  position: absolute;
  left: 84px;
  top: 18px;
  bottom: 18px;
  width: 2px;
  background: linear-gradient(180deg, var(--orange) 0%, var(--blue) 50%, rgba(0, 191, 255, 0.12) 100%);
}
.timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: 0;
  margin-bottom: 20px;
}
.timeline-marker {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  height: 32px;
  padding-right: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--blue);
  white-space: nowrap;
}
.timeline-marker::after {
  content: "";
  position: absolute;
  right: -8px;
  top: 50%;
  width: 8px;
  height: 2px;
  background: var(--blue);
  transform: translateY(-50%);
}
.timeline-item:last-child .timeline-marker {
  color: var(--orange);
}
.timeline-item:last-child .timeline-marker::after {
  background: var(--orange);
}
.timeline-card {
  background: var(--navy-card);
  padding: 18px 20px;
  border-left: 2px solid var(--blue);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% 100%, 0 100%);
}
.timeline-card-title {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 800;
}
.timeline-card p {
  margin: 0;
  color: var(--gray-blue);
  font-size: 14px;
  line-height: 1.65;
}
.timeline-picture {
  display: grid;
  grid-template-columns: 84px 1fr;
  margin: 28px 0;
}
.timeline-picture-media {
  grid-column: 2;
  max-width: 420px;
}
.timeline-picture-media img {
  display: block;
  width: 100%;
  height: auto;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

/* ===== 数据基础设施 ===== */
.about-infra-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 32px;
}
.infra-card {
  position: relative;
  background: var(--navy-card);
  padding: 28px 22px 24px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}
.infra-card-index {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}
.infra-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 800;
}
.infra-card p {
  margin: 0;
  color: var(--gray-blue);
  font-size: 14px;
  line-height: 1.65;
}

/* ===== 服务承诺 ===== */
.about-commit-visual {
  margin: 32px 0 24px;
}
.about-commit-visual img {
  display: block;
  width: 100%;
  height: auto;
  clip-path: polygon(0 6px, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}
.about-commit-visual figcaption {
  margin-top: 10px;
  padding-left: 12px;
  border-left: 3px solid var(--orange);
  font-size: 13px;
  color: var(--gray-blue);
}
.about-commit-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}
.commit-card {
  position: relative;
  background: var(--navy-card);
  padding: 24px 22px;
  border-left: 3px solid var(--orange);
}
.commit-card-tag {
  display: inline-block;
  margin-bottom: 14px;
  padding: 3px 8px;
  border: 1px solid rgba(0, 191, 255, 0.45);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--blue);
}
.commit-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-size: 17px;
  font-weight: 800;
}
.commit-card p {
  margin: 0;
  color: var(--gray-blue);
  font-size: 14px;
  line-height: 1.65;
}

/* ===== 信任条 ===== */
.about-trust-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 18px;
  padding: 32px 24px;
  background: linear-gradient(120deg, rgba(255, 74, 28, 0.92), rgba(0, 191, 255, 0.86));
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
}
.about-trust-text {
  margin: 0;
  max-width: 760px;
  color: var(--navy);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.7;
}

/* ===== 章节高亮指示条 ===== */
.page-about .section-head {
  position: relative;
  padding-left: 18px;
}
.page-about [data-spy].is-inview .section-head::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 3px;
  background: var(--blue);
}
.page-about .about-timeline-section [data-spy].is-inview .section-head::before,
.page-about .about-infra [data-spy].is-inview .section-head::before,
.page-about .about-commit [data-spy].is-inview .section-head::before {
  background: var(--blue);
}

/* ===== 桌面端布局 ===== */
@media (min-width: 900px) {
  .about-hero {
    padding-bottom: 64px;
  }
  .about-hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 56px;
    align-items: center;
  }
  .about-hero-stats {
    gap: 20px;
  }
  .about-hero-stats .stat-card:nth-child(2) {
    margin-top: 28px;
  }
  .about-hero-stats .stat-card:nth-child(4) {
    margin-top: 12px;
  }
  .about-mission-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    gap: 48px;
  }
  .about-infra-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 22px;
  }
  .about-commit-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 22px;
  }
  .about-trust-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 36px 40px;
  }
  .about-trust-text {
    font-size: 16px;
  }
}