.page-about {
  --c-about-accent-gradient: linear-gradient(135deg, #0B1A2E 0%, #1A1A2E 50%, #0B1A2E 100%);
  --c-about-hero-glow: radial-gradient(ellipse at 70% 50%, rgba(230, 57, 70, 0.15) 0%, rgba(0, 180, 216, 0.08) 40%, transparent 70%);
  --c-about-speed-color: rgba(255, 215, 0, 0.25);
  --c-about-border-glow: 0 0 20px rgba(230, 57, 70, 0.2);

  position: relative;
  background: var(--c-about-accent-gradient);
  min-height: 100vh;
  padding: 0;
  overflow-x: hidden;
}

/* 面包屑 */
.page-about__breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-sm, 8px);
  padding: var(--space-lg, 32px) var(--space-md, 16px) 0;
  max-width: 1280px;
  margin: 0 auto;
  font-family: var(--font-body, 'Open Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif);
  font-size: var(--caption, 12px);
  color: var(--c-text-secondary, #CCCCCC);
}

.page-about__breadcrumb .b-breadcrumb__link {
  color: var(--c-accent-blue, #00B4D8);
  text-decoration: none;
  transition: color var(--transition, 0.3s ease);
}

.page-about__breadcrumb .b-breadcrumb__link:hover {
  color: var(--c-accent-red, #E63946);
}

.page-about__breadcrumb .b-breadcrumb__sep {
  color: var(--c-text-secondary, #CCCCCC);
  opacity: 0.5;
}

.page-about__breadcrumb .b-breadcrumb__current {
  color: var(--c-text, #F4F4F4);
  font-weight: 600;
}

/* 首屏英雄区 - 分屏布局 */
.page-about__hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl, 64px) var(--space-lg, 32px);
  padding: var(--space-xl, 64px) var(--space-md, 16px) var(--space-lg, 32px);
  max-width: 1280px;
  margin: 0 auto;
  position: relative;
  align-items: center;
}

.page-about__hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--c-about-hero-glow);
  pointer-events: none;
  z-index: 0;
}

.page-about__hero-text {
  position: relative;
  z-index: 1;
}

.page-about__hero-title {
  font-family: var(--font-heading, 'Montserrat', 'Helvetica Neue', Arial, sans-serif);
  font-size: var(--h1, 64px);
  font-weight: 900;
  color: var(--c-text, #F4F4F4);
  margin: 0 0 var(--space-sm, 8px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  background: linear-gradient(135deg, #F4F4F4 30%, var(--c-accent-gold, #FFD700) 70%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-about__hero-sub {
  font-family: var(--font-heading, 'Montserrat', 'Helvetica Neue', Arial, sans-serif);
  font-size: var(--h3, 32px);
  font-weight: 700;
  color: var(--c-accent-red, #E63946);
  margin: 0 0 var(--space-md, 16px);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.page-about__hero-desc {
  font-family: var(--font-body, 'Open Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif);
  font-size: var(--body, 16px);
  line-height: 1.7;
  color: var(--c-text-secondary, #CCCCCC);
  max-width: 520px;
  margin: 0 0 var(--space-lg, 32px);
}

.page-about__hero-motto {
  display: flex;
  gap: var(--space-sm, 8px);
  flex-wrap: wrap;
}

.page-about__hero-motto .b-badge {
  padding: 6px 18px;
  font-size: var(--caption, 12px);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.page-about__hero-visual {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.page-about__hero-img {
  width: 100%;
  max-width: 500px;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--radius, 8px);
  box-shadow: 0 0 60px rgba(230, 57, 70, 0.15), 0 0 120px rgba(0, 180, 216, 0.08);
  position: relative;
  z-index: 1;
}

.page-about__hero-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 120%;
  height: 120%;
  transform: translate(-50%, -50%);
  background: radial-gradient(ellipse at center, rgba(255, 215, 0, 0.08) 0%, transparent 70%);
  z-index: 0;
  pointer-events: none;
}

/* 章节标题通用 */
.page-about__section-title {
  font-family: var(--font-heading, 'Montserrat', 'Helvetica Neue', Arial, sans-serif);
  font-size: var(--h2, 48px);
  font-weight: 900;
  color: var(--c-text, #F4F4F4);
  margin: 0 0 var(--space-sm, 8px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  text-align: center;
  position: relative;
}

.page-about__section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--c-accent-red, #E63946), var(--c-accent-gold, #FFD700));
  margin: var(--space-md, 16px) auto 0;
  border-radius: 2px;
}

.page-about__section-title--left {
  text-align: left;
}

.page-about__section-title--left::after {
  margin: var(--space-md, 16px) 0 0;
}

.page-about__section-desc {
  font-family: var(--font-body, 'Open Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif);
  font-size: var(--body, 16px);
  color: var(--c-text-secondary, #CCCCCC);
  text-align: center;
  max-width: 600px;
  margin: 0 auto var(--space-xl, 64px);
  line-height: 1.6;
}

/* 核心功能 - 卡片网格 */
.page-about__features {
  padding: var(--space-xl, 64px) 0;
  position: relative;
}

.page-about__features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg, 32px);
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-md, 16px);
}

.page-about__feature-card {
  background: var(--c-bg-secondary, #1A1A2E);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius, 8px);
  padding: var(--space-lg, 32px);
  transition: transform var(--transition, 0.3s ease), box-shadow var(--transition, 0.3s ease), border-color var(--transition, 0.3s ease);
  position: relative;
  overflow: hidden;
}

.page-about__feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  opacity: 0;
  transition: opacity var(--transition, 0.3s ease);
}

.page-about__feature-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3), var(--c-about-border-glow);
  border-color: rgba(255, 255, 255, 0.12);
}

.page-about__feature-card:hover::before {
  opacity: 1;
}

.page-about__feature-card:nth-child(1)::before {
  background: var(--c-accent-red, #E63946);
}
.page-about__feature-card:nth-child(2)::before {
  background: var(--c-accent-blue, #00B4D8);
}
.page-about__feature-card:nth-child(3)::before {
  background: var(--c-accent-gold, #FFD700);
}

.page-about__feature-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 12px;
  margin-bottom: var(--space-md, 16px);
  background: rgba(255, 255, 255, 0.04);
  transition: background var(--transition, 0.3s ease), transform var(--transition, 0.3s ease);
}

.page-about__feature-card:hover .page-about__feature-icon {
  transform: scale(1.05);
}

.page-about__feature-icon--red {
  background: rgba(230, 57, 70, 0.12);
}
.page-about__feature-icon--blue {
  background: rgba(0, 180, 216, 0.12);
}
.page-about__feature-icon--gold {
  background: rgba(255, 215, 0, 0.12);
}

.page-about__feature-title {
  font-family: var(--font-heading, 'Montserrat', 'Helvetica Neue', Arial, sans-serif);
  font-size: var(--h4, 24px);
  font-weight: 800;
  color: var(--c-text, #F4F4F4);
  margin: 0 0 var(--space-sm, 8px);
}

.page-about__feature-desc {
  font-family: var(--font-body, 'Open Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif);
  font-size: var(--body, 16px);
  color: var(--c-text-secondary, #CCCCCC);
  line-height: 1.6;
  margin: 0 0 var(--space-md, 16px);
}

.page-about__feature-data {
  display: flex;
  gap: var(--space-sm, 8px);
  align-items: center;
  flex-wrap: wrap;
}

.page-about__feature-data .b-data {
  color: var(--c-accent-red, #E63946);
  font-weight: 700;
  font-size: calc(var(--body, 16px) * 1.1);
}

.page-about__feature-data .b-tag {
  background: rgba(255, 255, 255, 0.06);
  color: var(--c-text-secondary, #CCCCCC);
  padding: 4px 12px;
  border-radius: 100px;
  font-size: var(--caption, 12px);
}

.page-about__feature-card--img .page-about__feature-card-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg, 32px);
}

.page-about__feature-img {
  width: 100%;
  max-width: 300px;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-sm, 4px);
  margin: 0 auto;
  display: block;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

/* 团队理念 - 宽窄交替 */
.page-about__philosophy {
  padding: var(--space-xl, 64px) 0;
  position: relative;
  overflow: hidden;
}

.page-about__philosophy::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(0, 180, 216, 0.06) 0%, transparent 60%);
  pointer-events: none;
}

.page-about__philosophy-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl, 64px) var(--space-lg, 32px);
  align-items: center;
}

.page-about__philosophy-text {
  position: relative;
  z-index: 1;
}

.page-about__philosophy-desc {
  font-family: var(--font-body, 'Open Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif);
  font-size: calc(var(--body, 16px) * 1.1);
  line-height: 1.7;
  color: var(--c-text-secondary, #CCCCCC);
  margin: var(--space-md, 16px) 0 var(--space-lg, 32px);
}

.page-about__highlight {
  color: var(--c-accent-gold, #FFD700);
  font-weight: 600;
}

.page-about__philosophy-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-md, 16px);
}

.page-about__philosophy-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md, 16px);
  font-family: var(--font-body, 'Open Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif);
  font-size: var(--body, 16px);
  color: var(--c-text, #F4F4F4);
  line-height: 1.6;
}

.page-about__philosophy-bullet {
  flex-shrink: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-accent-red, #E63946);
  margin-top: 8px;
  box-shadow: 0 0 10px rgba(230, 57, 70, 0.4);
}

.page-about__philosophy-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.page-about__philosophy-img {
  width: 100%;
  max-width: 400px;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius, 8px);
  box-shadow: 0 0 40px rgba(0, 180, 216, 0.1);
  position: relative;
  z-index: 1;
}

.page-about__philosophy-speed {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  z-index: 0;
  pointer-events: none;
  opacity: 0.3;
}

.page-about__speed-line {
  display: block;
  width: 2px;
  height: 60%;
  background: linear-gradient(to bottom, transparent, var(--c-accent-gold, #FFD700), transparent);
  animation: page-about-speedPulse 2s ease-in-out infinite;
  animation-delay: calc(var(--i, 1) * 0.3s);
}

@keyframes page-about-speedPulse {
  0%, 100% { opacity: 0.2; transform: scaleY(0.8); }
  50% { opacity: 0.8; transform: scaleY(1.2); }
}

/* 联系信息 */
.page-about__contact {
  padding: var(--space-xl, 64px) 0 var(--space-xl, 64px);
  position: relative;
}

.page-about__contact::before {
  content: '';
  position: absolute;
  top: 0;
  left: 10%;
  right: 10%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 215, 0, 0.2), transparent);
}

.page-about__contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md, 16px);
  max-width: 800px;
  margin: 0 auto;
}

.page-about__contact-card {
  display: flex;
  align-items: center;
  gap: var(--space-md, 16px);
  padding: var(--space-md, 16px) var(--space-lg, 32px);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius, 8px);
  text-decoration: none;
  transition: background var(--transition, 0.3s ease), border-color var(--transition, 0.3s ease), transform var(--transition, 0.3s ease);
  cursor: default;
}

a.page-about__contact-card {
  cursor: pointer;
}

a.page-about__contact-card:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(0, 180, 216, 0.25);
  transform: translateX(4px);
}

.page-about__contact-card--address {
  cursor: default;
}

.page-about__contact-card--address:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 215, 0, 0.2);
  transform: translateX(4px);
}

.page-about__contact-icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.04);
  transition: background var(--transition, 0.3s ease);
}

a.page-about__contact-card:hover .page-about__contact-icon,
.page-about__contact-card--address:hover .page-about__contact-icon {
  background: rgba(255, 255, 255, 0.08);
}

.page-about__contact-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about__contact-label {
  font-family: var(--font-body, 'Open Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif);
  font-size: var(--caption, 12px);
  color: var(--c-text-secondary, #CCCCCC);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.page-about__contact-value {
  font-family: var(--font-body, 'Open Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif);
  font-size: calc(var(--body, 16px) * 1.05);
  color: var(--c-text, #F4F4F4);
  font-weight: 500;
}

.page-about__contact-note {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md, 16px);
  margin-top: var(--space-lg, 32px);
  font-family: var(--font-body, 'Open Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif);
  font-size: var(--body, 16px);
  color: var(--c-text-secondary, #CCCCCC);
  text-align: center;
  flex-wrap: wrap;
}

.page-about__contact-note .b-badge {
  font-size: var(--caption, 12px);
  padding: 4px 14px;
}

/* 桌面端媒体查询 */
@media (min-width: 768px) {
  .page-about__breadcrumb {
    padding-left: var(--space-lg, 32px);
    padding-right: var(--space-lg, 32px);
  }

  .page-about__hero {
    grid-template-columns: 1fr 1fr;
    padding: var(--space-xl, 64px) var(--space-lg, 32px) var(--space-lg, 32px);
  }

  .page-about__hero-text {
    padding-right: var(--space-lg, 32px);
  }

  .page-about__features-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about__feature-card--img .page-about__feature-card-inner {
    flex-direction: column;
  }

  .page-about__feature-img {
    max-width: 100%;
  }

  .page-about__philosophy-inner {
    grid-template-columns: 1fr 1fr;
  }

  .page-about__philosophy-text {
    order: 0;
  }

  .page-about__contact-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about__contact-card {
    flex-direction: column;
    text-align: center;
    padding: var(--space-lg, 32px) var(--space-md, 16px);
  }

  .page-about__contact-text {
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .page-about__hero {
    padding: 80px var(--space-lg, 32px) var(--space-lg, 32px);
    gap: var(--space-xl, 64px);
  }

  .page-about__features {
    padding: 80px 0;
  }

  .page-about__philosophy {
    padding: 80px 0;
  }

  .page-about__contact {
    padding: 80px 0;
  }

  .page-about__section-title {
    font-size: var(--h2, 48px);
  }
}

/* 减少运动偏好 */
@media (prefers-reduced-motion: reduce) {
  .page-about__speed-line {
    animation: none;
    opacity: 0.4;
  }

  .page-about__feature-card,
  .page-about__contact-card,
  a.page-about__contact-card,
  .page-about__contact-card--address {
    transition: none;
  }

  .page-about__feature-card:hover {
    transform: none;
  }

  a.page-about__contact-card:hover,
  .page-about__contact-card--address:hover {
    transform: none;
  }
}

.page-about {
  --i: inherit;
}