.page-about {
  --about-accent: var(--color-accent);
  --about-gold: var(--color-gold);
  --about-bg: var(--color-bg);
  --about-bg-card: var(--color-bg-secondary);
  --about-text: var(--color-text);
  --about-text-white: var(--color-text-white);
  --about-border: var(--color-border);
  --about-border-light: var(--color-border-light);
  --about-font-mono: var(--font-mono);
  --about-font-heading: var(--font-heading);
  --about-shadow: var(--shadow-card);
  --about-radius: var(--radius-md);

  display: flex;
  flex-direction: column;
  gap: 3.5rem;
  padding: 2rem 1.5rem 3rem;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  color: var(--about-text);
  font-family: var(--about-font-heading);
  line-height: 1.6;
}

/* ---------- 面包屑 ---------- */
.about-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  color: var(--about-text);
  opacity: 0.7;
}
.about-breadcrumb-link {
  color: var(--about-accent);
  text-decoration: none;
  transition: opacity 0.25s;
}
.about-breadcrumb-link:hover,
.about-breadcrumb-link:focus-visible {
  opacity: 0.7;
  outline: 2px solid var(--about-accent);
  outline-offset: 2px;
}
.about-breadcrumb-sep {
  color: var(--about-gold);
  font-size: 0.7rem;
}
.about-breadcrumb-current {
  color: var(--about-text-white);
  font-weight: 600;
}

/* ---------- 英雄区 ---------- */
.about-hero {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2rem 2.5rem;
  padding: 2rem 0 1.5rem;
  border-bottom: 1px solid var(--about-border);
}
.about-hero-text {
  flex: 1 1 280px;
}
.about-hero-title {
  font-family: var(--about-font-heading);
  font-weight: 800;
  font-size: clamp(2.4rem, 7vw, 4.2rem);
  letter-spacing: -0.03em;
  text-transform: uppercase;
  color: var(--about-text-white);
  margin: 0 0 0.4rem;
  line-height: 1.05;
  /* 宽度拉伸效果 */
  transform: scaleX(1.05);
  transform-origin: left center;
}
.about-hero-slogan {
  font-family: var(--about-font-heading);
  font-weight: 800;
  font-size: clamp(1.1rem, 3vw, 1.8rem);
  letter-spacing: -0.01em;
  color: var(--about-accent);
  margin: 0 0 0.75rem;
  line-height: 1.2;
  transition: text-shadow 0.35s ease;
  cursor: default;
}
.about-hero-slogan:hover {
  text-shadow: 0 0 14px rgba(57, 255, 20, 0.45), 0 0 32px rgba(57, 255, 20, 0.18);
}
.about-hero-desc {
  font-size: 1rem;
  color: var(--about-text);
  max-width: 480px;
  margin: 0;
  line-height: 1.7;
}
.about-hero-visual {
  flex: 0 0 auto;
  max-width: 400px;
  width: 100%;
}
.about-hero-img {
  display: block;
  width: 100%;
  max-width: 400px;
  height: auto;
  object-fit: cover;
  border-radius: var(--about-radius);
  box-shadow: var(--about-shadow);
}

/* ---------- 品牌理念 ---------- */
.about-mission {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  padding: 1rem 0;
}
.about-mission-header {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}
.about-section-index {
  font-family: var(--about-font-mono);
  font-size: 0.85rem;
  color: var(--about-gold);
  letter-spacing: 0.05em;
  font-weight: 500;
}
.about-section-title {
  font-family: var(--about-font-heading);
  font-weight: 800;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  color: var(--about-text-white);
  margin: 0;
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.about-mission-body {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
}
.about-mission-content {
  flex: 2 1 320px;
}
.about-mission-content p {
  margin: 0 0 1rem;
  font-size: 1rem;
  line-height: 1.7;
}
.about-mission-highlight {
  color: var(--about-accent);
  font-weight: 700;
}
.about-mission-statement {
  flex: 1 1 200px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 1.25rem 1.5rem;
  background: var(--about-bg-card);
  border-radius: var(--about-radius);
  border-left: 3px solid var(--about-gold);
  box-shadow: var(--about-shadow);
}
.about-quote-mark {
  font-size: 2.8rem;
  line-height: 1;
  color: var(--about-gold);
  margin-bottom: -0.4rem;
}
.about-quote-text {
  font-family: var(--about-font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--about-text-white);
  margin: 0;
  line-height: 1.4;
  font-style: normal;
}

/* ---------- 服务范围 ---------- */
.about-services {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  padding: 0.5rem 0;
}
.about-services-header {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}
.about-services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1.25rem;
}
.about-service-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.5rem 1.25rem;
  background: var(--about-bg-card);
  border-radius: var(--about-radius);
  box-shadow: var(--about-shadow);
  border: 1px solid transparent;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.about-service-card:hover {
  border-color: var(--about-border);
  box-shadow: 0 4px 20px rgba(57, 255, 20, 0.08);
}
.about-service-icon {
  display: block;
  width: 80px;
  height: 80px;
  object-fit: cover;
  border-radius: 2px;
  flex-shrink: 0;
}
.about-service-name {
  font-family: var(--about-font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--about-text-white);
  margin: 0;
  letter-spacing: -0.01em;
}
.about-service-desc {
  font-size: 0.92rem;
  color: var(--about-text);
  margin: 0;
  line-height: 1.6;
}

/* ---------- 品牌历程 ---------- */
.about-timeline-section {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  padding: 0.5rem 0;
}
.about-timeline-header {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}
.about-timeline-layout {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem 2.5rem;
  align-items: flex-start;
}
.about-timeline-items {
  flex: 2 1 360px;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  position: relative;
  padding-left: 1.2rem;
  /* 斜线装饰 - 时间轴垂直线 */
  background: linear-gradient(to bottom, var(--about-border) 0%, var(--about-border) 100%);
  background-repeat: no-repeat;
  background-size: 1px 100%;
  background-position: 0 0;
}
.about-timeline-item {
  position: relative;
}
.about-timeline-node {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 0.75rem 0.75rem 1.5rem;
  cursor: pointer;
  border-radius: var(--about-radius);
  transition: background 0.25s ease;
  user-select: none;
  position: relative;
}
.about-timeline-node:hover {
  background: rgba(57, 255, 20, 0.06);
}
.about-timeline-node:focus-visible {
  outline: 2px solid var(--about-accent);
  outline-offset: 2px;
}
.about-timeline-marker {
  position: absolute;
  left: -0.95rem;
  top: 1.05rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--about-accent);
  box-shadow: 0 0 0 2px var(--about-bg), 0 0 0 4px var(--about-accent);
  flex-shrink: 0;
}
.about-timeline-phase {
  font-family: var(--about-font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--about-text-white);
  letter-spacing: 0.03em;
  flex: 1;
}
.about-timeline-arrow {
  font-size: 1.1rem;
  color: var(--about-gold);
  transition: transform 0.3s ease;
  font-weight: 700;
}
.about-timeline-item[data-expanded="true"] .about-timeline-arrow {
  transform: rotate(45deg);
}
.about-timeline-detail {
  padding: 0 0.75rem 0.75rem 2.8rem;
  font-size: 0.92rem;
  color: var(--about-text);
  line-height: 1.65;
}
.about-timeline-detail p {
  margin: 0;
}
.about-timeline-item[data-expanded="true"] .about-timeline-detail {
  display: block;
}
.about-timeline-item:not([data-expanded="true"]) .about-timeline-detail[hidden] {
  display: none;
}
.about-timeline-visual {
  flex: 0 0 auto;
  max-width: 300px;
  width: 100%;
}
.about-timeline-img {
  display: block;
  width: 100%;
  max-width: 300px;
  height: auto;
  object-fit: cover;
  border-radius: var(--about-radius);
  box-shadow: var(--about-shadow);
}

/* ---------- 内链导航 ---------- */
.about-internal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--about-border-light);
}
.about-internal-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1.2rem;
  font-family: var(--about-font-heading);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--about-accent);
  background: transparent;
  border: 1px solid var(--about-border);
  border-radius: var(--about-radius);
  text-decoration: none;
  transition: background 0.25s, color 0.25s, border-color 0.25s;
}
.about-internal-link:hover,
.about-internal-link:focus-visible {
  background: var(--about-accent);
  color: var(--about-bg);
  border-color: var(--about-accent);
}
.about-internal-link .mono {
  font-size: 0.85rem;
  transition: transform 0.25s;
}
.about-internal-link:hover .mono {
  transform: translateX(3px);
}

/* ========== 响应式 ========== */
@media (max-width: 767px) {
  .page-about {
    gap: 2.5rem;
    padding: 1.25rem 1rem 2rem;
  }
  .about-hero {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.25rem;
  }
  .about-hero-visual {
    max-width: 100%;
  }
  .about-hero-img {
    max-width: 100%;
  }
  .about-mission-body {
    flex-direction: column;
  }
  .about-mission-statement {
    width: 100%;
  }
  .about-services-grid {
    grid-template-columns: 1fr;
  }
  .about-timeline-layout {
    flex-direction: column;
  }
  .about-timeline-visual {
    max-width: 100%;
  }
  .about-timeline-img {
    max-width: 100%;
  }
  .about-internal-links {
    flex-direction: column;
  }
  .about-internal-link {
    justify-content: center;
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .about-hero {
    gap: 1.5rem;
  }
  .about-hero-visual {
    max-width: 300px;
  }
  .about-hero-img {
    max-width: 300px;
  }
  .about-services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .about-timeline-visual {
    max-width: 240px;
  }
  .about-timeline-img {
    max-width: 240px;
  }
}