.page-about {
  --about-cyan-glow: rgba(0, 229, 255, 0.12);
  --about-orange-glow: rgba(255, 106, 0, 0.12);
  --about-gold-line: rgba(255, 193, 7, 0.3);
  --about-ease: cubic-bezier(0.4, 0, 0.2, 1);
  background: var(--bg-deep);
  color: var(--text-main);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* 首屏品牌宣言 */
.page-about .about-hero {
  position: relative;
  padding: clamp(72px, 10vw, 120px) 0 clamp(48px, 6vw, 80px);
  background:
    linear-gradient(120deg, transparent 0%, transparent 70%, var(--about-cyan-glow) 70%, transparent 90%),
    radial-gradient(ellipse at 85% 15%, rgba(0, 229, 255, 0.1) 0%, transparent 55%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    -45deg,
    transparent 0px,
    transparent 18px,
    rgba(255, 255, 255, 0.015) 18px,
    rgba(255, 255, 255, 0.015) 19px
  );
}

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

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--text-sub);
  margin-bottom: 40px;
}

.page-about .breadcrumb a {
  color: var(--text-sub);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.page-about .about-hero-grid {
  display: grid;
  gap: 48px;
  align-items: center;
}

.page-about .about-hero-content {
  max-width: 720px;
}

.page-about .about-hero .section-eyebrow {
  color: var(--cyan);
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 12px 0 20px;
}

.page-about .about-hero-lead {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-sub);
  max-width: 600px;
  margin-bottom: 32px;
}

.page-about .about-hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 32px;
}

.page-about .about-stat {
  background: var(--bg-panel);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  min-width: 130px;
  border-left: 2px solid var(--cyan);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.page-about .about-stat:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 1.375rem;
  color: var(--cyan);
  line-height: 1.2;
}

.page-about .about-stat-label {
  display: block;
  font-size: 0.8125rem;
  color: var(--text-sub);
  margin-top: 4px;
}

.page-about .about-hero-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-hero-index a {
  font-size: 0.875rem;
  color: var(--text-sub);
  text-decoration: none;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(20, 27, 36, 0.6);
  transition: border-color var(--transition-fast), color var(--transition-fast), background var(--transition-fast);
}

.page-about .about-hero-index a:hover {
  color: var(--orange);
  border-color: var(--orange);
  background: rgba(255, 106, 0, 0.08);
}

.page-about .about-hero-visual {
  position: relative;
}

.page-about .about-hero-image {
  border-radius: var(--radius);
  overflow: hidden;
  transform: rotate(1.5deg);
  background: var(--bg-panel);
  box-shadow: var(--shadow-glow);
}

.page-about .about-hero-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.08) 0%, transparent 45%);
  pointer-events: none;
}

.page-about .about-hero-image img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

/* 品牌缘起 */
.page-about .about-origin {
  position: relative;
  padding: clamp(72px, 10vw, 110px) 0;
  background: var(--bg-panel);
}

.page-about .about-origin::after {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--cyan) 15%, var(--cyan) 30%, transparent 30%, transparent 70%, var(--orange) 70%, var(--orange) 85%, transparent 85%);
  opacity: 0.35;
}

.page-about .about-origin-grid {
  display: grid;
  gap: 48px;
  margin-top: 48px;
}

.page-about .about-origin-text p {
  line-height: 1.8;
  color: var(--text-sub);
  margin-bottom: 16px;
  font-size: 0.9375rem;
}

.page-about .about-origin-points {
  display: grid;
  gap: 16px;
}

.page-about .about-point {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 16px;
  padding: 20px;
  background: var(--bg-elev);
  border-radius: var(--radius-sm);
  border-right: 2px solid var(--orange);
  transition: transform var(--about-ease), box-shadow var(--about-ease);
}

.page-about .about-point:hover {
  transform: translateX(6px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.page-about .about-point-num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 1.375rem;
  color: var(--orange);
  line-height: 1.4;
}

.page-about .about-point h3 {
  font-family: var(--font-head);
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.page-about .about-point p {
  font-size: 0.875rem;
  color: var(--text-sub);
  line-height: 1.6;
  margin: 0;
}

/* 发展里程碑 */
.page-about .about-milestones {
  position: relative;
  padding: clamp(72px, 10vw, 110px) 0;
}

.page-about .about-milestone-image {
  margin: 48px 0 64px;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-panel);
}

.page-about .about-milestone-image img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

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

.page-about .about-timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--about-gold-line) 60%, rgba(255, 193, 7, 0.06) 100%);
}

.page-about .about-timeline-item {
  position: relative;
  padding: 0 0 40px 36px;
}

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

.page-about .about-timeline-item::before {
  content: '';
  position: absolute;
  left: 1px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--cyan);
  border: 3px solid var(--bg-deep);
  box-shadow: 0 0 0 1px var(--cyan), 0 0 12px rgba(0, 229, 255, 0.45);
}

.page-about .about-timeline-year {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(2rem, 6vw, 3.5rem);
  color: var(--gold);
  margin-bottom: 6px;
  line-height: 1.15;
}

.page-about .about-timeline-content {
  background: var(--bg-panel);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  border-left: 3px solid transparent;
  transition: border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.page-about .about-timeline-content:hover {
  border-left-color: var(--orange);
  transform: translateX(4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.page-about .about-timeline-content h3 {
  font-family: var(--font-head);
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.page-about .about-timeline-content p {
  color: var(--text-sub);
  font-size: 0.875rem;
  line-height: 1.7;
  margin: 0;
}

/* 数据与质量体系 */
.page-about .about-quality {
  position: relative;
  padding: clamp(72px, 10vw, 110px) 0;
  background: var(--bg-panel);
}

.page-about .about-quality::after {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--orange) 20%, var(--orange) 35%, transparent 35%);
  opacity: 0.3;
}

.page-about .about-quality-grid {
  display: grid;
  gap: 16px;
  margin-top: 48px;
}

.page-about .about-quality-card {
  background: var(--bg-deep);
  border-radius: var(--radius-sm);
  padding: 28px 24px;
  position: relative;
  overflow: hidden;
  border-top: 2px solid var(--line);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

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

.page-about .about-quality-card::after {
  content: '';
  position: absolute;
  right: -18px;
  top: -18px;
  width: 70px;
  height: 70px;
  background: linear-gradient(135deg, transparent 0%, rgba(0, 229, 255, 0.05) 100%);
  transform: rotate(45deg);
}

.page-about .about-quality-num {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 2rem;
  color: var(--cyan);
  margin-bottom: 8px;
  line-height: 1.1;
}

.page-about .about-quality-card h3 {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.page-about .about-quality-card p {
  font-size: 0.875rem;
  color: var(--text-sub);
  line-height: 1.6;
  margin: 0;
}

.page-about .about-quality-note {
  margin-top: 32px;
  padding: 24px;
  background: var(--bg-elev);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--orange);
}

.page-about .about-quality-note p {
  margin: 0;
  color: var(--text-main);
  line-height: 1.8;
  font-size: 0.9375rem;
}

/* 合作生态与认可 */
.page-about .about-ecosystem {
  padding: clamp(72px, 10vw, 110px) 0;
}

.page-about .about-eco-grid {
  display: grid;
  gap: 48px;
  margin-top: 48px;
}

.page-about .about-eco-image {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-panel);
}

.page-about .about-eco-image img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-eco-info {
  display: grid;
  gap: 16px;
}

.page-about .about-eco-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 20px;
  background: var(--bg-panel);
  border-radius: var(--radius-sm);
  border-left: 2px solid var(--cyan);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.page-about .about-eco-row:hover {
  transform: translateX(4px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.page-about .about-eco-tag {
  display: inline-block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .about-eco-row p {
  margin: 0;
  color: var(--text-sub);
  font-size: 0.875rem;
  line-height: 1.7;
}

/* 内容联动 CTA */
.page-about .about-cta {
  padding-bottom: clamp(72px, 10vw, 110px);
}

.page-about .about-cta-inner {
  text-align: center;
  padding: 56px 24px;
  background: linear-gradient(135deg, var(--bg-elev) 0%, var(--bg-panel) 100%);
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
}

.page-about .about-cta-inner::before {
  content: '';
  position: absolute;
  top: -40px;
  right: -40px;
  width: 180px;
  height: 180px;
  background: linear-gradient(135deg, transparent 0%, rgba(255, 106, 0, 0.12) 100%);
  transform: rotate(45deg);
}

.page-about .about-cta-inner::after {
  content: '';
  position: absolute;
  bottom: -60px;
  left: -60px;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(0, 229, 255, 0.08) 0%, transparent 70%);
}

.page-about .about-cta-inner .section-eyebrow {
  color: var(--cyan);
}

.page-about .about-cta-inner h2 {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 800;
  margin-bottom: 12px;
}

.page-about .about-cta-inner > p {
  color: var(--text-sub);
  margin-bottom: 32px;
  position: relative;
  z-index: 1;
}

.page-about .about-cta-links {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

/* 桌面端布局 */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 120px 0 80px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 64px;
  }

  .page-about .about-origin-grid {
    grid-template-columns: 1fr 1fr;
    gap: 64px;
  }

  .page-about .about-quality-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }

  .page-about .about-eco-grid {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 64px;
    align-items: center;
  }

  .page-about .about-eco-row {
    grid-template-columns: 150px 1fr;
    gap: 16px;
  }

  /* 桌面端时间轴左右交替 */
  .page-about .about-timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about .about-timeline-item {
    width: 50%;
    padding: 0 48px 56px 0;
    text-align: right;
  }

  .page-about .about-timeline-item::before {
    left: auto;
    right: -8px;
    top: 8px;
  }

  .page-about .about-timeline-item:nth-child(even) {
    margin-left: 50%;
    padding: 0 0 56px 48px;
    text-align: left;
  }

  .page-about .about-timeline-item:nth-child(even)::before {
    left: -8px;
    right: auto;
  }

  .page-about .about-timeline-content {
    border-left: none;
    border-right: 3px solid transparent;
  }

  .page-about .about-timeline-item:nth-child(even) .about-timeline-content {
    border-left: 3px solid transparent;
    border-right: none;
  }

  .page-about .about-timeline-content:hover {
    border-left-color: transparent;
    border-right-color: var(--orange);
    transform: translateX(-4px);
  }

  .page-about .about-timeline-item:nth-child(even) .about-timeline-content:hover {
    border-left-color: var(--orange);
    border-right-color: transparent;
    transform: translateX(4px);
  }

  .page-about .about-timeline-year {
    font-size: 3rem;
  }
}