.page-about {
  --about-primary: #4CAF50;
  --about-primary-dark: #388E3C;
  --about-primary-light: #81C784;
  --about-secondary: #FF9800;
  --about-accent: #00BCD4;
  --about-neutral-dark: #212121;
  --about-neutral-mid: #757575;
  --about-neutral-light: #F5F5F5;
  --about-white: #FFFFFF;
  --about-border: #E0E0E0;
  --about-shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --about-shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --about-radius: 6px;
  --about-font-sans: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Roboto', sans-serif;
}

.page-about .about-container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 24px 20px 56px;
  font-family: var(--about-font-sans);
  color: var(--about-neutral-dark);
  line-height: 1.6;
}

/* ===== 面包屑 ===== */
.page-about .about-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--about-neutral-mid);
  margin-bottom: 32px;
  letter-spacing: 0.02em;
}
.page-about .about-breadcrumb-link {
  color: var(--about-neutral-mid);
  text-decoration: none;
  transition: color 0.2s;
}
.page-about .about-breadcrumb-link:hover {
  color: var(--about-primary);
}
.page-about .about-breadcrumb-sep {
  color: var(--about-border);
  font-size: 12px;
}
.page-about .about-breadcrumb-current {
  color: var(--about-neutral-dark);
  font-weight: 600;
}

/* ===== 章节容器 ===== */
.page-about .about-chapter {
  margin-bottom: 64px;
  position: relative;
}
.page-about .about-chapter:last-child {
  margin-bottom: 0;
}

/* 章节标记（编号 + 标签） */
.page-about .about-chapter-marker {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-border);
}
.page-about .about-chapter-num {
  font-family: 'Montserrat', var(--about-font-sans);
  font-weight: 700;
  font-size: 20px;
  color: var(--about-primary);
  letter-spacing: 0.04em;
  line-height: 1;
}
.page-about .about-chapter-label {
  font-family: 'Montserrat', var(--about-font-sans);
  font-weight: 700;
  font-size: 18px;
  color: var(--about-neutral-dark);
  letter-spacing: 0.02em;
}

/* 章节内容外框 */
.page-about .about-chapter-frame {
  position: relative;
  padding: 4px 0 0 0;
}

/* ===== 品牌故事（01） ===== */
.page-about .about-story-layout {
  display: flex;
  flex-direction: column;
  gap: 32px;
}
.page-about .about-story-visual {
  flex: 0 0 auto;
}
.page-about .about-frame-box {
  position: relative;
  display: inline-block;
  max-width: 100%;
  border: 1px solid var(--about-border);
  padding: 6px;
  background: var(--about-white);
  box-shadow: var(--about-shadow-sm);
}
.page-about .about-story-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-frame-tick {
  position: absolute;
  width: 12px;
  height: 12px;
  border-color: var(--about-primary);
  border-style: solid;
}
.page-about .about-frame-tick--tl {
  top: -1px;
  left: -1px;
  border-width: 2px 0 0 2px;
}
.page-about .about-frame-tick--tr {
  top: -1px;
  right: -1px;
  border-width: 2px 2px 0 0;
}
.page-about .about-frame-tick--bl {
  bottom: -1px;
  left: -1px;
  border-width: 0 0 2px 2px;
}
.page-about .about-frame-tick--br {
  bottom: -1px;
  right: -1px;
  border-width: 0 2px 2px 0;
}

.page-about .about-story-content {
  flex: 1;
}
.page-about .about-story-heading {
  font-family: 'Montserrat', var(--about-font-sans);
  font-weight: 700;
  font-size: 32px;
  line-height: 1.2;
  color: var(--about-neutral-dark);
  margin: 0 0 6px;
  letter-spacing: -0.01em;
}
.page-about .about-story-sub {
  font-family: 'Montserrat', var(--about-font-sans);
  font-weight: 600;
  font-size: 15px;
  color: var(--about-primary);
  letter-spacing: 0.06em;
  margin: 0 0 20px;
  text-transform: uppercase;
}
.page-about .about-story-text {
  font-size: 16px;
  color: var(--about-neutral-dark);
  margin: 0 0 16px;
  line-height: 1.7;
}
.page-about .about-story-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
  margin-top: 12px;
}
.page-about .about-story-btn {
  display: inline-block;
  background: var(--about-primary);
  color: var(--about-white);
  padding: 10px 24px;
  border-radius: var(--about-radius);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s, transform 0.15s;
}
.page-about .about-story-btn:hover {
  background: var(--about-primary-dark);
  transform: translateY(-1px);
}
.page-about .about-story-link {
  font-size: 15px;
  color: var(--about-primary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}
.page-about .about-story-link:hover {
  color: var(--about-secondary);
}

/* ===== 运营信息（02） ===== */
.page-about .about-ops-layout {
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.page-about .about-ops-info {
  flex: 1;
}
.page-about .about-ops-heading {
  font-family: 'Montserrat', var(--about-font-sans);
  font-weight: 700;
  font-size: 22px;
  margin: 0 0 20px;
  color: var(--about-neutral-dark);
}
.page-about .about-ops-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--about-border);
  border-radius: var(--about-radius);
  overflow: hidden;
}
.page-about .about-ops-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--about-border);
  background: var(--about-white);
  font-size: 15px;
  line-height: 1.5;
}
.page-about .about-ops-item:last-child {
  border-bottom: none;
}
.page-about .about-ops-icon {
  color: var(--about-primary);
  font-size: 10px;
  flex-shrink: 0;
  width: 20px;
  text-align: center;
}
.page-about .about-ops-label {
  font-weight: 600;
  color: var(--about-neutral-dark);
  flex-shrink: 0;
  min-width: 90px;
}
.page-about .about-ops-value {
  color: var(--about-neutral-dark);
  word-break: break-word;
}
.page-about .about-ops-note {
  font-size: 14px;
  color: var(--about-neutral-mid);
  margin: 16px 0 0;
  padding-left: 4px;
  border-left: 3px solid var(--about-primary-light);
  padding-left: 12px;
}
.page-about .about-ops-visual {
  flex: 0 0 auto;
}
.page-about .about-ops-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-border);
  padding: 4px;
  background: var(--about-white);
  box-shadow: var(--about-shadow-sm);
}

/* ===== 我们的承诺（03） ===== */
.page-about .about-commit-visual {
  margin-bottom: 28px;
}
.page-about .about-commit-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-border);
  padding: 4px;
  background: var(--about-white);
  box-shadow: var(--about-shadow-sm);
}

.page-about .about-commit-grid {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 32px;
}
.page-about .about-commit-card {
  background: var(--about-white);
  border: 1px solid var(--about-border);
  border-radius: var(--about-radius);
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: box-shadow 0.25s, transform 0.25s;
}
.page-about .about-commit-card:hover {
  box-shadow: var(--about-shadow-md);
  transform: translateY(-2px);
}
.page-about .about-commit-card-icon {
  flex-shrink: 0;
}
.page-about .about-commit-card-icon svg {
  display: block;
}
.page-about .about-commit-card-title {
  font-family: 'Montserrat', var(--about-font-sans);
  font-weight: 700;
  font-size: 18px;
  margin: 0;
  color: var(--about-neutral-dark);
}
.page-about .about-commit-card-text {
  font-size: 15px;
  color: var(--about-neutral-dark);
  margin: 0;
  line-height: 1.7;
}

.page-about .about-commit-cta {
  text-align: center;
  padding: 24px 0 8px;
  border-top: 1px solid var(--about-border);
}
.page-about .about-commit-cta-text {
  font-size: 16px;
  color: var(--about-neutral-dark);
  margin: 0 0 16px;
}
.page-about .about-commit-cta .btn-primary {
  display: inline-block;
  background: var(--about-secondary);
  color: var(--about-white);
  padding: 10px 32px;
  border-radius: var(--about-radius);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s, transform 0.15s;
}
.page-about .about-commit-cta .btn-primary:hover {
  background: #E68900;
  transform: translateY(-1px);
}

/* ===== 响应式：桌面 ≥ 768px ===== */
@media (min-width: 768px) {
  .page-about .about-container {
    padding: 32px 32px 72px;
  }
  .page-about .about-breadcrumb {
    margin-bottom: 40px;
  }
  .page-about .about-chapter {
    margin-bottom: 80px;
  }
  .page-about .about-chapter-marker {
    margin-bottom: 28px;
    padding-bottom: 16px;
  }
  .page-about .about-chapter-num {
    font-size: 24px;
  }
  .page-about .about-chapter-label {
    font-size: 20px;
  }

  /* 品牌故事：两栏布局 */
  .page-about .about-story-layout {
    flex-direction: row;
    align-items: flex-start;
    gap: 48px;
  }
  .page-about .about-story-visual {
    flex: 0 0 45%;
    max-width: 45%;
  }
  .page-about .about-story-heading {
    font-size: 38px;
  }
  .page-about .about-story-sub {
    font-size: 16px;
  }

  /* 运营信息：两栏布局 */
  .page-about .about-ops-layout {
    flex-direction: row;
    align-items: flex-start;
    gap: 40px;
  }
  .page-about .about-ops-info {
    flex: 1;
  }
  .page-about .about-ops-visual {
    flex: 0 0 40%;
    max-width: 40%;
  }
  .page-about .about-ops-heading {
    font-size: 24px;
  }

  /* 承诺卡片：三列网格 */
  .page-about .about-commit-grid {
    flex-direction: row;
    gap: 24px;
  }
  .page-about .about-commit-card {
    flex: 1;
    padding: 28px 24px;
  }
  .page-about .about-commit-card-title {
    font-size: 19px;
  }
}

/* ===== 宽桌面 ≥ 1024px ===== */
@media (min-width: 1024px) {
  .page-about .about-container {
    padding: 40px 40px 80px;
  }
  .page-about .about-story-heading {
    font-size: 42px;
  }
  .page-about .about-story-links {
    gap: 28px;
  }
  .page-about .about-ops-item {
    padding: 16px 24px;
    font-size: 16px;
  }
  .page-about .about-commit-cta {
    padding: 32px 0 8px;
  }
}

/* ===== 动画：图片占位边框效果 ===== */
.page-about .about-frame-box {
  transition: box-shadow 0.3s;
}
.page-about .about-frame-box:hover {
  box-shadow: var(--about-shadow-md);
}

/* ===== 确保图片不溢出 ===== */
.page-about img {
  max-width: 100%;
  height: auto;
}

/* ===== 章节间装饰分隔 ===== */
.page-about .about-chapter::after {
  content: '';
  display: block;
  height: 1px;
  background: linear-gradient(to right, var(--about-border), var(--about-primary-light), var(--about-border));
  margin-top: 0;
  opacity: 0.4;
}
.page-about .about-chapter:last-child::after {
  display: none;
}

/* ===== 无 JS 时仍可读 ===== */
.page-about .about-chapter {
  scroll-margin-top: 80px;
}