/* ===== 品牌故事专属样式 ===== */
.page-about {
  --timeline-line-color: var(--color-primary-red, #E60012);
  --timeline-node-color: var(--color-secondary-gold, #FFD700);
  --timeline-node-size: 18px;
  --aside-width: 140px;
  --gap-col: 48px;
}

/* ---------- 面包屑 ---------- */
.about-breadcrumb {
  max-width: var(--container-max, 1280px);
  margin: 0 auto;
  padding: 16px 24px 0;
  font-family: var(--font-body, 'Helvetica Neue', Arial, sans-serif);
  font-size: 14px;
  color: var(--color-muted-text, #999);
  letter-spacing: 0.5px;
}
.about-breadcrumb a {
  color: var(--color-muted-text, #999);
  text-decoration: none;
  transition: color var(--transition-fast, 200ms ease);
}
.about-breadcrumb a:hover,
.about-breadcrumb a:focus-visible {
  color: var(--color-primary-red, #E60012);
  outline: none;
}
.about-breadcrumb__sep {
  margin: 0 8px;
  opacity: 0.5;
}
.about-breadcrumb [aria-current="page"] {
  color: var(--color-light-text, #F0F0F0);
  font-weight: 600;
}

/* ---------- 首屏 ---------- */
.about-hero {
  padding: 40px 24px 60px;
  position: relative;
  overflow: hidden;
}
.about-hero::before {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(230,0,18,0.08) 0%, transparent 70%);
  pointer-events: none;
}
.about-hero__inner {
  display: flex;
  flex-direction: column;
  gap: 32px;
  position: relative;
  z-index: 1;
}
.about-kicker {
  display: inline-block;
  font-family: var(--font-accent, 'Courier New', monospace);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--color-secondary-gold, #FFD700);
  margin-bottom: 12px;
  border-left: 3px solid var(--color-primary-red, #E60012);
  padding-left: 12px;
}
.about-hero__title {
  font-family: var(--font-heading, Impact, 'Arial Black', sans-serif);
  font-size: clamp(36px, 8vw, 64px);
  line-height: 1.05;
  color: var(--color-light-text, #F0F0F0);
  margin: 0 0 16px;
  text-transform: uppercase;
  letter-spacing: -0.5px;
}
.about-hero__title-accent {
  display: block;
  color: var(--color-primary-red, #E60012);
  font-style: italic;
  transform: skewX(-4deg);
  text-shadow: 2px 2px 0 rgba(0,0,0,0.3);
}
.about-hero__intro {
  font-family: var(--font-body, 'Helvetica Neue', Arial, sans-serif);
  font-size: clamp(16px, 2vw, 20px);
  line-height: 1.8;
  color: var(--color-muted-text, #999);
  max-width: 540px;
  margin: 0 0 28px;
}
.about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}
.about-hero__visual {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
}
.about-hero__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius-md, 8px);
  box-shadow: 0 20px 60px rgba(230,0,18,0.15);
}

/* ---------- 通用节标题 ---------- */
.about-section-label {
  display: inline-block;
  font-family: var(--font-accent, 'Courier New', monospace);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--color-secondary-gold, #FFD700);
  border-bottom: 1px solid rgba(255,215,0,0.3);
  padding-bottom: 6px;
  margin-bottom: 8px;
}
.about-section-desc {
  font-family: var(--font-body, 'Helvetica Neue', Arial, sans-serif);
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-muted-text, #999);
  margin: 0;
}
.about-section-title {
  font-family: var(--font-heading, Impact, 'Arial Black', sans-serif);
  font-size: clamp(28px, 5vw, 48px);
  line-height: 1.1;
  color: var(--color-light-text, #F0F0F0);
  margin: 0 0 20px;
  letter-spacing: -0.3px;
}

/* ---------- 我们的理念 ---------- */
.about-mission {
  padding: 60px 24px 80px;
  background: linear-gradient(180deg, var(--color-primary-black, #0A0A0A) 0%, var(--color-dark-surface, #1A1A1A) 100%);
  position: relative;
}
.about-mission::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-primary-red, #E60012), transparent);
}
.about-mission__inner {
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.about-mission__aside {
  min-width: var(--aside-width, 140px);
  border-left: 2px solid var(--color-secondary-gold, #FFD700);
  padding-left: 16px;
}
.about-mission__content {
  flex: 1;
}
.about-mission__text {
  font-family: var(--font-body, 'Helvetica Neue', Arial, sans-serif);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-light-text, #F0F0F0);
  max-width: 680px;
  margin: 0 0 28px;
}
.about-mission__stats {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
}
.about-mission__stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.about-mission__stat .data-label {
  font-size: 12px;
  color: var(--color-muted-text, #999);
  text-transform: uppercase;
  letter-spacing: 1px;
}
.about-mission__stat .data-value {
  font-size: 32px;
  font-family: var(--font-heading, Impact, 'Arial Black', sans-serif);
  line-height: 1;
}
.about-mission__stat .data-value--blue {
  color: var(--color-accent-blue, #00BFFF);
  text-shadow: 0 0 20px rgba(0,191,255,0.3);
}
.about-mission__stat .data-value--red {
  color: var(--color-primary-red, #E60012);
  text-shadow: 0 0 20px rgba(230,0,18,0.3);
}
.about-mission__visual {
  width: 100%;
  max-width: 800px;
  margin: 8px 0 0;
}
.about-mission__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius-md, 8px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.4);
}

/* ---------- 会员权益演进 ---------- */
.about-evolution {
  padding: 60px 24px 80px;
  background: var(--color-primary-black, #0A0A0A);
  position: relative;
}
.about-evolution::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-secondary-gold, #FFD700), transparent);
}
.about-evolution__inner {
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.about-evolution__aside {
  min-width: var(--aside-width, 140px);
  border-left: 2px solid var(--color-secondary-gold, #FFD700);
  padding-left: 16px;
}
.about-evolution__main {
  flex: 1;
}
.about-evolution__lead {
  font-family: var(--font-body, 'Helvetica Neue', Arial, sans-serif);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-muted-text, #999);
  max-width: 600px;
  margin: 0 0 40px;
}

/* ---------- 时间轴 ---------- */
.about-timeline {
  position: relative;
  padding-left: 32px;
  margin-bottom: 40px;
}
.about-timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--timeline-line-color, #E60012), var(--color-secondary-gold, #FFD700));
  border-radius: 2px;
}
.about-timeline__item {
  position: relative;
  padding-bottom: 36px;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.about-timeline__item:last-child {
  padding-bottom: 0;
}
.about-timeline__item[data-reveal].revealed {
  opacity: 1;
  transform: translateY(0);
}
.about-timeline__item[data-reveal].revealed:nth-child(1) { transition-delay: 0.05s; }
.about-timeline__item[data-reveal].revealed:nth-child(2) { transition-delay: 0.15s; }
.about-timeline__item[data-reveal].revealed:nth-child(3) { transition-delay: 0.25s; }
.about-timeline__item[data-reveal].revealed:nth-child(4) { transition-delay: 0.35s; }
.about-timeline__marker {
  position: absolute;
  left: -26px;
  top: 4px;
  width: var(--timeline-node-size, 18px);
  height: var(--timeline-node-size, 18px);
  border-radius: 50%;
  background: var(--timeline-node-color, #FFD700);
  border: 3px solid var(--color-primary-black, #0A0A0A);
  box-shadow: 0 0 0 2px var(--timeline-node-color, #FFD700), 0 0 20px rgba(255,215,0,0.3);
  z-index: 2;
  transition: box-shadow var(--transition-base, 300ms ease);
}
.about-timeline__item:hover .about-timeline__marker {
  box-shadow: 0 0 0 4px var(--timeline-node-color, #FFD700), 0 0 40px rgba(255,215,0,0.5);
}
.about-timeline__card {
  padding: 16px 20px;
  border-radius: var(--radius-md, 8px);
  transition: background var(--transition-base, 300ms ease), transform var(--transition-fast, 200ms ease);
  cursor: default;
}
.about-timeline__card:hover {
  background: rgba(255,255,255,0.10);
  transform: translateX(4px);
}
.about-timeline__card .about-timeline__desc {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, opacity 0.4s ease;
  opacity: 0;
}
.about-timeline__card:hover .about-timeline__desc {
  max-height: 100px;
  opacity: 1;
}
.about-timeline__date {
  display: inline-block;
  font-family: var(--font-accent, 'Courier New', monospace);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--color-secondary-gold, #FFD700);
  margin-bottom: 4px;
}
.about-timeline__title {
  font-family: var(--font-heading, Impact, 'Arial Black', sans-serif);
  font-size: 18px;
  line-height: 1.2;
  color: var(--color-light-text, #F0F0F0);
  margin: 0 0 4px;
}
.about-timeline__desc {
  font-family: var(--font-body, 'Helvetica Neue', Arial, sans-serif);
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-muted-text, #999);
  margin: 0;
}
.about-evolution__image-wrap {
  width: 100%;
  max-width: 600px;
  margin: 0;
}
.about-evolution__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius-sm, 4px);
}

/* ---------- 技术愿景 ---------- */
.about-vision {
  padding: 60px 24px 80px;
  background: linear-gradient(180deg, var(--color-dark-surface, #1A1A1A) 0%, var(--color-primary-black, #0A0A0A) 100%);
  position: relative;
}
.about-vision::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent-blue, #00BFFF), transparent);
}
.about-vision__inner {
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.about-vision__aside {
  min-width: var(--aside-width, 140px);
  border-left: 2px solid var(--color-accent-blue, #00BFFF);
  padding-left: 16px;
}
.about-vision__content {
  flex: 1;
}
.about-vision__text {
  font-family: var(--font-body, 'Helvetica Neue', Arial, sans-serif);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-light-text, #F0F0F0);
  max-width: 680px;
  margin: 0 0 28px;
}
.about-vision__highlight {
  padding: 20px 24px;
  border-left: 4px solid var(--color-accent-blue, #00BFFF);
  max-width: 600px;
}
.about-vision__highlight p {
  font-family: var(--font-body, 'Helvetica Neue', Arial, sans-serif);
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-light-text, #F0F0F0);
  margin: 0;
}
.about-vision__highlight strong {
  color: var(--color-secondary-gold, #FFD700);
}
.about-vision__highlight-icon {
  display: inline-block;
  color: var(--color-accent-blue, #00BFFF);
  font-size: 20px;
  margin-right: 8px;
  vertical-align: middle;
}
.about-vision__visual {
  width: 100%;
  max-width: 800px;
  margin: 8px 0 0;
}
.about-vision__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius-md, 8px);
  box-shadow: 0 12px 40px rgba(0,191,255,0.10);
}

/* ---------- 内部链接区 ---------- */
.about-links {
  padding: 60px 24px 80px;
  background: var(--color-primary-black, #0A0A0A);
}
.about-links__title {
  text-align: center;
  margin-bottom: 40px;
  font-size: clamp(24px, 4vw, 36px);
}
.about-links__grid {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 800px;
  margin: 0 auto;
}
.about-links__card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  border-radius: var(--radius-md, 8px);
  text-decoration: none;
  transition: background var(--transition-base, 300ms ease), transform var(--transition-fast, 200ms ease);
  cursor: pointer;
}
.about-links__card:hover {
  background: rgba(255,255,255,0.10);
  transform: translateX(6px);
}
.about-links__card-icon {
  font-size: 24px;
  color: var(--color-primary-red, #E60012);
  flex-shrink: 0;
  width: 36px;
  text-align: center;
}
.about-links__card-label {
  font-family: var(--font-heading, Impact, 'Arial Black', sans-serif);
  font-size: 18px;
  color: var(--color-light-text, #F0F0F0);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.about-links__card-desc {
  display: block;
  font-family: var(--font-body, 'Helvetica Neue', Arial, sans-serif);
  font-size: 13px;
  color: var(--color-muted-text, #999);
  margin-top: 2px;
}

/* ===== 桌面端媒体查询 ===== */
@media (min-width: 768px) {
  .about-hero {
    padding: 48px 24px 80px;
  }
  .about-hero__inner {
    flex-direction: row;
    align-items: center;
    gap: var(--gap-col, 48px);
  }
  .about-hero__text {
    flex: 1 1 45%;
  }
  .about-hero__visual {
    flex: 1 1 50%;
    max-width: 50%;
  }

  .about-mission__inner {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--gap-col, 48px);
  }
  .about-mission__aside {
    flex-shrink: 0;
    width: var(--aside-width, 140px);
  }
  .about-mission__content {
    flex: 1;
  }
  .about-mission__visual {
    flex-shrink: 0;
    width: 360px;
    margin: 0;
  }

  .about-evolution__inner {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--gap-col, 48px);
  }
  .about-evolution__aside {
    flex-shrink: 0;
    width: var(--aside-width, 140px);
  }
  .about-evolution__main {
    flex: 1;
  }
  .about-evolution__image-wrap {
    margin: 0;
  }

  .about-vision__inner {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--gap-col, 48px);
  }
  .about-vision__aside {
    flex-shrink: 0;
    width: var(--aside-width, 140px);
  }
  .about-vision__content {
    flex: 1;
  }
  .about-vision__visual {
    flex-shrink: 0;
    width: 400px;
    margin: 0;
  }

  .about-links__grid {
    flex-direction: row;
    gap: 24px;
  }
  .about-links__card {
    flex: 1;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
    padding: 28px 24px;
  }
  .about-links__card:hover {
    transform: translateY(-4px);
  }
  .about-links__card-icon {
    font-size: 32px;
    text-align: left;
  }
}

@media (min-width: 1024px) {
  .about-hero__inner {
    gap: 64px;
  }
  .about-mission__visual {
    width: 440px;
  }
  .about-vision__visual {
    width: 480px;
  }
  .about-timeline {
    padding-left: 40px;
  }
  .about-timeline__marker {
    left: -30px;
    width: 20px;
    height: 20px;
  }
  .about-timeline__card {
    padding: 20px 28px;
  }
  .about-timeline__title {
    font-size: 20px;
  }
  .about-section-title {
    font-size: 44px;
  }
}