.page-about {
  background: var(--deep-space);
  color: var(--text-light);
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .about-crumb {
  padding-top: 1.5rem;
}

.page-about .about-crumb .breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: rgba(229, 231, 235, 0.6);
}

.page-about .about-crumb .breadcrumb a {
  color: inherit;
  text-decoration: none;
}

.page-about .about-crumb .breadcrumb a:hover {
  color: var(--vibrant-orange);
}

/* 首屏封面 */
.page-about .about-cover {
  position: relative;
  padding: 3rem 0;
}

.page-about .about-cover::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 15% 20%, rgba(30, 58, 138, 0.65), transparent 50%),
    radial-gradient(ellipse at 90% 15%, rgba(255, 46, 99, 0.18), transparent 42%),
    linear-gradient(180deg, rgba(10, 14, 39, 0.25), rgba(10, 14, 39, 0.85));
  pointer-events: none;
}

.page-about .about-cover-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2.5rem;
}

.page-about .about-cover-text {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  align-items: flex-start;
}

.page-about .about-cover-text .section-eyebrow {
  color: var(--vibrant-orange);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  margin: 0;
}

.page-about .about-cover-text h1 {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(2.2rem, 5vw, 4.4rem);
  line-height: 1.12;
  color: var(--white);
  margin: 0;
  max-width: 760px;
}

.page-about .about-cover-lead {
  font-size: 1.05rem;
  line-height: 1.7;
  color: rgba(229, 231, 235, 0.82);
  max-width: 58ch;
  margin: 0;
}

.page-about .about-cover-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1.6rem;
  padding-top: 0.6rem;
}

.page-about .about-cover-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.85);
}

.page-about .about-cover-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--vibrant-orange);
  box-shadow: 0 0 12px rgba(255, 94, 58, 0.8);
}

.page-about .about-cover-dot--green {
  background: var(--fluorescent-green);
  box-shadow: 0 0 12px rgba(57, 255, 20, 0.6);
}

.page-about .about-cover-dot--pink {
  background: var(--fluorescent-pink);
  box-shadow: 0 0 12px rgba(255, 46, 99, 0.7);
}

.page-about .about-cover-visual {
  position: relative;
  border-radius: var(--radius);
}

.page-about .about-cover-img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 420px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--glass-border);
}

.page-about .about-cover-pulse {
  position: absolute;
  right: 0.6rem;
  bottom: 0.6rem;
  width: 150px;
  height: auto;
  pointer-events: none;
  opacity: 0.9;
  filter: drop-shadow(0 0 8px rgba(255, 94, 58, 0.5));
}

/* 章节基础 */
.page-about .about-chapter {
  padding: 3.5rem 0;
  border-top: 1px solid var(--glass-border);
  position: relative;
}

.page-about .about-chapter--alt {
  background: linear-gradient(135deg, rgba(30, 58, 138, 0.45) 0%, rgba(10, 14, 39, 0.9) 40%, rgba(30, 58, 138, 0.35) 100%);
}

.page-about .about-chapter--commit {
  background: linear-gradient(180deg, rgba(10, 14, 39, 0) 0%, rgba(99, 102, 241, 0.16) 60%, rgba(255, 46, 99, 0.08) 100%);
}

.page-about .about-spread {
  display: grid;
  gap: 2rem;
}

.page-about .about-spread-text {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  align-items: flex-start;
}

.page-about .about-spread-text h2 {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(1.8rem, 3.5vw, 2.9rem);
  line-height: 1.2;
  color: var(--white);
  margin: 0;
}

.page-about .about-chapter-num {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--vibrant-orange);
  background: rgba(255, 94, 58, 0.12);
  border: 1px solid rgba(255, 94, 58, 0.35);
  border-radius: 999px;
  padding: 0.3rem 0.8rem;
  letter-spacing: 0.08em;
}

.page-about .about-spread-text p,
.page-about .about-spread-text li {
  font-size: 0.95rem;
  line-height: 1.75;
  color: rgba(229, 231, 235, 0.82);
}

/* 统计卡片 */
.page-about .about-stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.page-about .about-stat-card {
  background: var(--glass);
  backdrop-filter: blur(8px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 1.4rem 1.2rem;
  min-height: 110px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.5rem;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .about-stat-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(255, 94, 58, 0.18);
  border-color: rgba(255, 94, 58, 0.5);
}

.page-about .about-stat-card--orange {
  background: linear-gradient(135deg, rgba(255, 94, 58, 0.22), rgba(255, 46, 99, 0.08));
  border-color: rgba(255, 94, 58, 0.4);
}

.page-about .about-stat-digit {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1;
  color: var(--white);
}

.page-about .about-stat-card--orange .about-stat-digit {
  color: var(--vibrant-orange);
}

.page-about .about-stat-label {
  font-size: 0.8rem;
  color: rgba(229, 231, 235, 0.72);
  letter-spacing: 0.04em;
}

/* 数据能力 */
.page-about .about-freq-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.8rem;
  width: 100%;
}

.page-about .about-freq-item {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 1rem 0.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  text-align: center;
}

.page-about .about-freq-time {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--fluorescent-green);
}

.page-about .about-freq-desc {
  font-size: 0.8rem;
  color: rgba(229, 231, 235, 0.75);
}

.page-about .about-capability-figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.page-about .about-capability-img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--glass-border);
  object-fit: contain;
}

.page-about .about-capability-figure figcaption {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: rgba(229, 231, 235, 0.7);
  text-align: center;
  letter-spacing: 0.03em;
}

/* 发展历程 */
.page-about .about-timeline-img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--glass-border);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  width: 100%;
}

.page-about .about-timeline-item {
  position: relative;
  padding: 0 0 0 1.4rem;
  border-left: 2px solid rgba(255, 94, 58, 0.55);
}

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 0.4rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--vibrant-orange);
  box-shadow: 0 0 14px rgba(255, 94, 58, 0.7);
}

.page-about .about-timeline-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 1rem;
  color: var(--white);
  background: rgba(255, 94, 58, 0.15);
  border: 1px solid rgba(255, 94, 58, 0.4);
  border-radius: 999px;
  padding: 0.2rem 0.7rem;
  margin-bottom: 0.5rem;
}

.page-about .about-timeline-item p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.65;
  color: rgba(229, 231, 235, 0.8);
}

/* 服务承诺 */
.page-about .about-commit-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  width: 100%;
}

.page-about .about-commit-list li {
  position: relative;
  padding-left: 1.1rem;
  font-size: 0.95rem;
  line-height: 1.75;
  color: rgba(229, 231, 235, 0.82);
}

.page-about .about-commit-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--indigo);
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.7);
}

.page-about .about-commit-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  padding-top: 0.4rem;
}

.page-about .about-commit-stack {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.page-about .about-commit-card {
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.04));
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius);
  padding: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  transition: border-color 0.3s var(--ease);
}

.page-about .about-commit-card--accent {
  background: linear-gradient(145deg, rgba(99, 102, 241, 0.18), rgba(255, 46, 99, 0.08));
  border-color: rgba(99, 102, 241, 0.3);
}

.page-about .about-commit-card:hover {
  border-color: var(--vibrant-orange);
}

.page-about .about-commit-tag {
  display: inline-block;
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--vibrant-orange);
  letter-spacing: 0.05em;
}

.page-about .about-commit-card--accent .about-commit-tag {
  color: var(--indigo);
}

.page-about .about-commit-card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(229, 231, 235, 0.85);
}

/* 平板 */
@media (min-width: 768px) {
  .page-about .about-cover {
    padding: 4.5rem 0 4rem;
  }

  .page-about .about-cover-grid {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
    gap: 3rem;
  }

  .page-about .about-cover-img {
    max-height: 520px;
  }

  .page-about .about-chapter {
    padding: 4.5rem 0;
  }

  .page-about .about-spread {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
  }

  .page-about .about-spread--reverse .about-spread-text {
    order: 2;
  }

  .page-about .about-spread--reverse .about-spread-data,
  .page-about .about-spread--reverse .about-spread-visual {
    order: 1;
  }

  .page-about .about-stat-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.2rem;
  }
}

/* 桌面 */
@media (min-width: 1024px) {
  .page-about .about-cover {
    padding: 6rem 0 5.5rem;
  }

  .page-about .about-chapter {
    padding: 6rem 0;
  }

  .page-about .about-spread {
    gap: 5rem;
  }

  .page-about .about-stat-card {
    padding: 1.8rem 1.6rem;
    min-height: 140px;
  }
}