/* ===== 品牌故事页专属样式 .page-about ===== */
.page-about {
  --about-timeline-bg: #00251a;
  --about-card-shadow: 8px 8px 0 rgba(0, 77, 64, 0.18);
  --about-card-radius: 4px;
  --about-transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  display: block;
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  font-family: var(--font-body, Georgia, serif);
  color: var(--color-text, #1a1a1a);
  background: var(--color-bg-light, #f5f5f0);
}

/* 面包屑 */
.about-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
  font-size: 0.875rem;
  font-family: var(--font-heading, Impact, sans-serif);
  color: var(--color-primary, #004d40);
}
.about-breadcrumb a {
  color: var(--color-primary, #004d40);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color var(--about-transition);
}
.about-breadcrumb a:hover,
.about-breadcrumb a:focus-visible {
  border-bottom-color: var(--color-secondary, #cfa144);
}
.about-breadcrumb-sep {
  color: var(--color-secondary, #cfa144);
  font-weight: bold;
  font-size: 1.1rem;
}
.about-breadcrumb [aria-current="page"] {
  color: var(--color-secondary, #cfa144);
  font-weight: bold;
  border-bottom: 2px solid var(--color-secondary, #cfa144);
}

/* ===== 分屏首屏 ===== */
.about-split {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  margin-bottom: 4rem;
  position: relative;
}

/* 时间线容器 */
.about-timeline-wrap {
  background: var(--about-timeline-bg);
  border: var(--border-thick, 4px) solid var(--color-primary, #004d40);
  box-shadow: var(--shadow-heavy, 8px 8px 0 rgba(0,0,0,0.15));
  padding: 1.5rem 1rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  flex-shrink: 0;
}
.about-timeline-svg {
  display: block;
  width: 100%;
  min-width: 160px;
  max-width: 200px;
  height: auto;
  margin: 0 auto;
}

/* 时间线节点悬停交互 */
.about-tl-node {
  cursor: default;
  transition: transform var(--about-transition);
}
.about-tl-node:hover circle,
.about-tl-node:focus-visible circle {
  fill: var(--color-secondary, #cfa144);
  stroke: var(--color-text-light, #ffffff);
  stroke-width: 3;
  transition: fill var(--about-transition), stroke var(--about-transition);
}
.about-tl-node:hover text,
.about-tl-node:focus-visible text {
  fill: var(--color-secondary, #cfa144);
  transition: fill var(--about-transition);
}
.about-tl-node:hover .about-tl-desc,
.about-tl-node:focus-visible .about-tl-desc {
  fill: #ffffff;
  transition: fill var(--about-transition);
}
.about-tl-node text,
.about-tl-desc {
  transition: fill var(--about-transition);
}

/* 右侧内容 */
.about-split-content {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.about-split-title {
  font-family: var(--font-heading, Impact, sans-serif);
  font-size: clamp(2rem, 6vw, 3rem);
  color: var(--color-primary, #004d40);
  margin: 0;
  line-height: 1.1;
  letter-spacing: 0.02em;
  border-left: 6px solid var(--color-secondary, #cfa144);
  padding-left: 1rem;
}
.about-split-lead {
  font-family: var(--font-heading, Impact, sans-serif);
  font-size: 1.25rem;
  color: var(--color-accent, #8b2252);
  margin: 0;
  line-height: 1.3;
}
.about-split-body {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text, #1a1a1a);
  max-width: 620px;
  margin: 0;
}
.about-split-img {
  max-width: 100%;
  height: auto;
  border: var(--border-thick, 4px) solid var(--color-primary, #004d40);
  box-shadow: var(--shadow-heavy, 8px 8px 0 rgba(0,0,0,0.15));
  object-fit: cover;
  margin-top: 0.5rem;
}
.about-split-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-heading, Impact, sans-serif);
  font-size: 1.05rem;
  color: var(--color-primary, #004d40);
  text-decoration: none;
  border-bottom: 3px solid var(--color-secondary, #cfa144);
  padding-bottom: 0.25rem;
  align-self: flex-start;
  transition: color var(--about-transition), border-color var(--about-transition);
}
.about-split-link:hover,
.about-split-link:focus-visible {
  color: var(--color-accent, #8b2252);
  border-bottom-color: var(--color-accent, #8b2252);
}

/* ===== 通用 section 主题带 ===== */
.about-section {
  margin-bottom: 4rem;
  padding: 2.5rem 0;
  border-top: 3px solid var(--color-primary, #004d40);
  border-bottom: 3px solid var(--color-primary, #004d40);
  background: var(--color-bg-light, #f5f5f0);
  position: relative;
}
.about-section::before {
  content: "";
  position: absolute;
  top: -3px;
  left: 0;
  width: 80px;
  height: 3px;
  background: var(--color-secondary, #cfa144);
}
.about-section-heading {
  font-family: var(--font-heading, Impact, sans-serif);
  font-size: clamp(1.8rem, 5vw, 2.6rem);
  color: var(--color-primary, #004d40);
  margin: 0 0 0.25rem;
  line-height: 1.15;
  letter-spacing: 0.02em;
}
.about-section-sub {
  font-family: var(--font-body, Georgia, serif);
  font-size: 1rem;
  color: var(--color-accent, #8b2252);
  margin: 0 0 2rem;
  font-style: italic;
}

/* ===== 核心价值 ===== */
.about-values-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1rem;
}
.about-values-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

/* 卡片翻转 */
.about-value-card {
  perspective: 1000px;
  height: 320px;
}
.about-value-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform var(--about-transition);
  transform-style: preserve-3d;
}
.about-value-card:hover .about-value-inner,
.about-value-card:focus-within .about-value-inner {
  transform: rotateY(180deg);
}
.about-value-front,
.about-value-back {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border: var(--border-thick, 4px) solid var(--color-primary, #004d40);
  box-shadow: var(--about-card-shadow);
  border-radius: var(--about-card-radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.5rem;
  text-align: center;
  background: var(--color-text-light, #ffffff);
}
.about-value-back {
  transform: rotateY(180deg);
  background: var(--color-primary, #004d40);
  color: var(--color-text-light, #ffffff);
  justify-content: center;
  gap: 1rem;
}
.about-value-back p {
  font-size: 0.95rem;
  line-height: 1.6;
  max-width: 280px;
  margin: 0;
}
.about-value-icon {
  width: 100px;
  height: 100px;
  object-fit: cover;
  border: 3px solid var(--color-secondary, #cfa144);
  border-radius: 50%;
  margin-bottom: 1rem;
  transition: border-color var(--about-transition);
}
.about-value-card:hover .about-value-icon {
  border-color: var(--color-accent, #8b2252);
}
.about-value-title {
  font-family: var(--font-heading, Impact, sans-serif);
  font-size: 1.5rem;
  color: var(--color-primary, #004d40);
  margin: 0.25rem 0 0.5rem;
}
.about-value-brief {
  font-size: 0.9rem;
  color: var(--color-accent, #8b2252);
  font-style: italic;
  margin: 0;
}

/* ===== 服务承诺 ===== */
.about-commitment-inner {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1rem;
}
.about-commitment-text {
  flex: 1;
}
.about-commitment-text p {
  font-size: 1rem;
  line-height: 1.75;
  margin: 0 0 1.25rem;
  max-width: 640px;
}
.about-commitment-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-heading, Impact, sans-serif);
  font-size: 1rem;
  color: var(--color-primary, #004d40);
  text-decoration: none;
  border-bottom: 3px solid var(--color-secondary, #cfa144);
  padding-bottom: 0.2rem;
  transition: color var(--about-transition), border-color var(--about-transition);
}
.about-commitment-link:hover,
.about-commitment-link:focus-visible {
  color: var(--color-accent, #8b2252);
  border-bottom-color: var(--color-accent, #8b2252);
}
.about-commitment-visual {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.about-commitment-img {
  max-width: 100%;
  height: auto;
  border: var(--border-thick, 4px) solid var(--color-primary, #004d40);
  box-shadow: var(--shadow-heavy-accent, 8px 8px 0 rgba(139,34,82,0.25));
  object-fit: cover;
}

/* ===== 相关页面导航 ===== */
.about-links {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 3px solid var(--color-primary, #004d40);
}
.about-links-label {
  display: block;
  font-family: var(--font-heading, Impact, sans-serif);
  font-size: 1.2rem;
  color: var(--color-primary, #004d40);
  margin-bottom: 1rem;
  letter-spacing: 0.04em;
}
.about-links-list {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
}
.about-links-item {
  font-family: var(--font-heading, Impact, sans-serif);
  font-size: 1rem;
  color: var(--color-primary, #004d40);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  padding-bottom: 0.15rem;
  transition: border-color var(--about-transition), color var(--about-transition);
}
.about-links-item:hover,
.about-links-item:focus-visible {
  border-bottom-color: var(--color-secondary, #cfa144);
  color: var(--color-secondary, #cfa144);
}

/* ===== 滚动显现 ===== */
[data-reveal] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
[data-revealed] {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 桌面端 (≥768px) ===== */
@media (min-width: 768px) {
  .page-about {
    padding: 2.5rem 2.5rem 4rem;
  }
  .about-breadcrumb {
    margin-bottom: 3.5rem;
    font-size: 1rem;
  }

  /* 分屏并排 */
  .about-split {
    flex-direction: row;
    align-items: flex-start;
    gap: 3rem;
  }
  .about-timeline-wrap {
    flex: 0 0 220px;
    padding: 2rem 1.5rem;
    position: sticky;
    top: 2rem;
  }
  .about-timeline-svg {
    max-width: 100%;
    height: auto;
  }
  .about-split-content {
    flex: 1;
    padding-top: 0.5rem;
  }
  .about-split-img {
    max-width: 440px;
  }

  /* 核心价值三列 */
  .about-values-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
  }
  .about-value-card {
    height: 360px;
  }

  /* 服务承诺并排 */
  .about-commitment-inner {
    flex-direction: row;
    align-items: center;
    gap: 3rem;
  }
  .about-commitment-text {
    flex: 1;
  }
  .about-commitment-visual {
    flex: 0 0 320px;
  }
}

/* ===== 宽桌面 (≥1200px) ===== */
@media (min-width: 1200px) {
  .page-about {
    padding: 3rem 3.5rem 5rem;
  }
  .about-timeline-wrap {
    flex: 0 0 260px;
  }
  .about-split {
    gap: 4rem;
  }
  .about-values-grid {
    gap: 3rem;
  }
  .about-value-card {
    height: 400px;
  }
  .about-commitment-visual {
    flex: 0 0 360px;
  }
}