.page-about {
  --about-accent: #ff6b35;
  --about-accent-hover: #ff8f5e;
  --about-silver: #c0c0c0;
  --about-card-bg: rgba(255,255,255,0.08);
  --about-card-dark: rgba(0,0,0,0.45);
  --about-text: #e0e0e0;
  --about-heading: #ffffff;
  --about-radius: 16px;
  --about-gap: 2rem;
  display: block;
  width: 100%;
}

/* 面包屑 */
.page-about .breadcrumb {
  padding-top: 1.5rem;
  padding-bottom: 0.5rem;
}
.page-about .breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  font-size: 0.875rem;
  color: var(--about-silver, #c0c0c0);
}
.page-about .breadcrumb a {
  color: var(--about-silver, #c0c0c0);
  text-decoration: none;
  transition: color 0.2s;
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--about-accent, #ff6b35);
  outline: none;
}
.page-about .breadcrumb .sep {
  margin-left: 0.25rem;
  color: var(--about-silver, #c0c0c0);
}

/* 简介区 */
.page-about__intro {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  padding-top: 1rem;
  padding-bottom: 3rem;
}
.page-about__intro-text h1 {
  font-family: var(--font-heading, 'Helvetica Neue', Arial, sans-serif);
  font-weight: 800;
  font-size: clamp(2rem, 5vw, 3.2rem);
  color: var(--about-heading, #ffffff);
  line-height: 1.15;
  margin: 0 0 1rem;
}
.page-about__tagline {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--about-accent, #ff6b35);
  margin-bottom: 1rem;
  line-height: 1.4;
}
.page-about__desc {
  font-size: 1rem;
  color: var(--about-text, #e0e0e0);
  max-width: 600px;
  line-height: 1.7;
}
.page-about__intro-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}
.page-about__brand-img {
  max-width: 100%;
  height: auto;
  border-radius: var(--about-radius, 16px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.5);
  object-fit: cover;
  display: block;
}

/* 品牌故事区 */
.page-about__story {
  padding-bottom: 3rem;
}
.page-about__story-grid {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}
.page-about__story-left h2 {
  margin-bottom: 1.25rem;
}
.page-about__story-left p {
  color: var(--about-text, #e0e0e0);
  line-height: 1.7;
  margin-bottom: 1rem;
  max-width: 600px;
}
.page-about__story-left .btn {
  margin-top: 0.5rem;
}
.page-about__story-right {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.page-about__story-card {
  padding: 1.25rem 1.5rem;
  border-radius: var(--about-radius, 16px);
  border: 1px solid rgba(255,255,255,0.06);
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  transition: transform 0.25s, border-color 0.25s;
}
.page-about__story-card:hover {
  transform: translateX(6px);
  border-color: var(--about-accent, #ff6b35);
}
.page-about__story-card-number {
  font-family: var(--font-mono, 'Fira Code', monospace);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--about-accent, #ff6b35);
  flex-shrink: 0;
  line-height: 1.2;
}
.page-about__story-card-text {
  margin: 0;
  color: var(--about-text, #e0e0e0);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* 核心功能 - 卡片翻转 */
.page-about__features {
  padding-bottom: 3rem;
}
.page-about__features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 1.5rem;
}
.page-about__feature-card {
  perspective: 1000px;
  cursor: default;
  background: transparent;
  border: none;
  padding: 0;
  min-height: 260px;
}
.page-about__feature-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
  border-radius: var(--about-radius, 16px);
}
.page-about__feature-card:hover .page-about__feature-card-inner,
.page-about__feature-card:focus-within .page-about__feature-card-inner {
  transform: rotateY(180deg);
}
.page-about__feature-front,
.page-about__feature-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: var(--about-radius, 16px);
  padding: 1.75rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
}
.page-about__feature-front {
  background: var(--about-card-bg, rgba(255,255,255,0.08));
  border: 1px solid rgba(255,255,255,0.08);
}
.page-about__feature-back {
  background: var(--about-card-dark, rgba(0,0,0,0.45));
  border: 1px solid var(--about-accent, #ff6b35);
  transform: rotateY(180deg);
  color: var(--about-text, #e0e0e0);
  font-size: 0.95rem;
  line-height: 1.7;
}
.page-about__feature-icon {
  display: inline-flex;
  margin-bottom: 0.75rem;
}
.page-about__feature-title {
  font-family: var(--font-heading, 'Helvetica Neue', Arial, sans-serif);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--about-heading, #ffffff);
  margin: 0 0 0.5rem;
}
.page-about__feature-desc {
  color: var(--about-text, #e0e0e0);
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 0;
}

/* 用户权益 */
.page-about__rights {
  padding-bottom: 3rem;
}
.page-about__rights-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-top: 1.5rem;
}
.page-about__rights-item {
  padding: 1.5rem;
  border-radius: var(--about-radius, 16px);
  background: var(--about-card-bg, rgba(255,255,255,0.08));
  border: 1px solid rgba(255,255,255,0.06);
  transition: transform 0.25s, border-color 0.25s;
}
.page-about__rights-item:hover {
  transform: translateY(-4px);
  border-color: var(--about-accent, #ff6b35);
}
.page-about__rights-icon {
  font-size: 1.75rem;
  display: block;
  margin-bottom: 0.75rem;
  color: var(--about-accent, #ff6b35);
}
.page-about__rights-item h3 {
  font-family: var(--font-heading, 'Helvetica Neue', Arial, sans-serif);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--about-heading, #ffffff);
  margin: 0 0 0.5rem;
}
.page-about__rights-item p {
  color: var(--about-text, #e0e0e0);
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 0;
}

/* 专家专栏横幅 */
.page-about__expert {
  padding-bottom: 3rem;
}
.page-about__expert-banner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  padding: 2rem 1.5rem;
  border-radius: var(--about-radius, 16px);
  border: 1px solid rgba(255,255,255,0.06);
  align-items: center;
  text-align: center;
}
.page-about__expert-text h2 {
  margin-bottom: 1rem;
}
.page-about__expert-text p {
  color: var(--about-text, #e0e0e0);
  line-height: 1.7;
  margin-bottom: 1.25rem;
  max-width: 500px;
}
.page-about__expert-visual img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.4);
  object-fit: cover;
  display: block;
}

/* 数据背景图 */
.page-about__data-bg {
  padding-bottom: 2rem;
  text-align: center;
}
.page-about__data-img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  opacity: 0.7;
  display: block;
  margin: 0 auto;
}

/* CTA */
.page-about__cta {
  padding-bottom: 4rem;
}
.page-about__cta-box {
  padding: 2.5rem 2rem;
  border-radius: var(--about-radius, 16px);
  border: 1px solid rgba(255,255,255,0.08);
  text-align: center;
  background: var(--about-card-dark, rgba(0,0,0,0.45));
}
.page-about__cta-title {
  font-family: var(--font-heading, 'Helvetica Neue', Arial, sans-serif);
  font-weight: 800;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  color: var(--about-heading, #ffffff);
  margin: 0 0 0.75rem;
}
.page-about__cta-desc {
  color: var(--about-text, #e0e0e0);
  max-width: 480px;
  margin: 0 auto 1.5rem;
  line-height: 1.6;
}
.page-about__cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}
.page-about .btn-secondary {
  background: transparent;
  border: 2px solid var(--about-accent, #ff6b35);
  color: var(--about-accent, #ff6b35);
}
.page-about .btn-secondary:hover,
.page-about .btn-secondary:focus-visible {
  background: var(--about-accent, #ff6b35);
  color: #0a1628;
}

/* 桌面端媒体查询 */
@media (min-width: 768px) {
  .page-about__intro {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding-top: 2rem;
    padding-bottom: 4rem;
  }
  .page-about__intro-text {
    flex: 1 1 55%;
    max-width: 580px;
  }
  .page-about__intro-visual {
    flex: 0 0 40%;
    justify-content: flex-end;
  }
  .page-about__brand-img {
    width: 400px;
    height: 300px;
  }
  .page-about__story-grid {
    flex-direction: row;
    gap: 3rem;
  }
  .page-about__story-left {
    flex: 1 1 55%;
  }
  .page-about__story-right {
    flex: 0 0 40%;
  }
  .page-about__features-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about__rights-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about__expert-banner {
    flex-direction: row;
    text-align: left;
    padding: 2.5rem 3rem;
    justify-content: space-between;
  }
  .page-about__expert-text {
    flex: 1 1 55%;
  }
  .page-about__expert-visual {
    flex: 0 0 35%;
    max-width: 300px;
  }
  .page-about__cta-box {
    padding: 3rem 4rem;
  }
}
@media (min-width: 1024px) {
  .page-about__rights-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about__features-grid {
    gap: 2rem;
  }
}

/* reduced-motion 兼容 */
@media (prefers-reduced-motion: reduce) {
  .page-about__story-card,
  .page-about__rights-item {
    transition: none;
  }
  .page-about__feature-card-inner {
    transition: none;
  }
  .page-about__feature-card:hover .page-about__feature-card-inner,
  .page-about__feature-card:focus-within .page-about__feature-card-inner {
    transform: none;
  }
  .page-about__feature-back {
    display: none;
  }
  .page-about__feature-card:hover .page-about__feature-back,
  .page-about__feature-card:focus-within .page-about__feature-back {
    display: flex;
  }
}

/* 滚动显现占位 - 由全局 JS 控制 .reveal/.revealed */
.page-about .reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.page-about .reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}
.page-about .reveal[data-reveal="fade"] {
  transform: none;
}
.page-about .reveal[data-reveal="fade"].revealed {
  opacity: 1;
}