.page-about {
  --page-color-brand: #FF6B35;
  --page-color-blue: #004E8C;
  --page-color-green: #00CC66;
  --page-color-dark: #1A1A1A;
  --page-color-text: #1A1A1A;
  --page-color-text-secondary: #666666;
  --page-color-bg: #FFFFFF;
  --page-color-bg-secondary: #F0F2F5;
  --page-color-border: #333333;
  --page-shadow-strong: 8px 8px 0 rgba(0,0,0,0.15);
  --page-shadow-hover: 12px 12px 0 rgba(0,0,0,0.2);
  --page-border-thick: 3px solid var(--page-color-border);
  --page-font-heading: 800 2.2rem/1.1 'Inter','Roboto','Noto Sans SC',sans-serif;
  --page-font-mono: 'JetBrains Mono','SF Mono',monospace;
  --page-spacing-sm: 0.75rem;
  --page-spacing-md: 1.5rem;
  --page-spacing-lg: 3rem;
  --page-spacing-xl: 4.5rem;

  display: block;
  background: var(--page-color-bg);
  color: var(--page-color-text);
  font-weight: 300;
  letter-spacing: 0.01em;
  line-height: 1.6;
}

/* ── 容器 ── */
.page-about__container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--page-spacing-md) var(--page-spacing-sm) var(--page-spacing-lg);
}

/* ── 面包屑 ── */
.page-about__breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--page-color-text-secondary);
  margin-bottom: var(--page-spacing-lg);
}
.page-about__breadcrumb a {
  color: var(--page-color-brand);
  text-decoration: none;
  font-weight: 500;
}
.page-about__breadcrumb a:hover {
  text-decoration: underline;
}
.breadcrumb__sep {
  color: var(--page-color-text-secondary);
}

/* ── 通用标题 ── */
.page-about__heading {
  font: var(--page-font-heading);
  margin: 0 0 var(--page-spacing-sm);
  color: var(--page-color-dark);
  letter-spacing: -0.02em;
}
.page-about__heading--sec {
  font-size: 1.8rem;
}
.page-about__heading--promise {
  font-size: 1.8rem;
  text-align: center;
}
.page-about__subhead {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--page-color-brand);
  margin-bottom: var(--page-spacing-sm);
  letter-spacing: 0.02em;
}

/* ── 品牌故事（图文错位） ── */
.page-about__story {
  display: flex;
  flex-direction: column;
  gap: var(--page-spacing-lg);
  margin-bottom: var(--page-spacing-xl);
  position: relative;
}
.page-about__story-text {
  flex: 1 1 55%;
  order: 2;
}
.page-about__story-visual {
  flex: 1 1 40%;
  order: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}
.page-about__gradient-img {
  max-width: 100%;
  height: auto;
  object-fit: contain;
  border: var(--page-border-thick);
  box-shadow: var(--page-shadow-strong);
  display: block;
}
.page-about__body {
  font-size: 1rem;
  color: var(--page-color-text-secondary);
}
.page-about__body p {
  margin-bottom: var(--page-spacing-sm);
}
.page-about__body p:last-child {
  margin-bottom: 0;
}

/* ── 核心优势 ── */
.page-about__advantages {
  margin-bottom: var(--page-spacing-xl);
  position: relative;
}
.page-about__advantages-header {
  display: flex;
  align-items: center;
  gap: var(--page-spacing-sm);
  margin-bottom: var(--page-spacing-md);
}
.page-about__advantages-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--page-spacing-md);
}
.page-about__advantage-card {
  border: var(--page-border-thick);
  box-shadow: var(--page-shadow-strong);
  background: var(--page-color-bg-secondary);
  overflow: hidden;
  transition: box-shadow 0.25s ease;
}
.page-about__advantage-card:hover {
  box-shadow: var(--page-shadow-hover);
}
.page-about__advantage-trigger {
  display: flex;
  align-items: center;
  gap: var(--page-spacing-sm);
  padding: var(--page-spacing-sm) var(--page-spacing-md);
  cursor: pointer;
  background: var(--page-color-bg);
  border-bottom: 2px solid var(--page-color-border);
  user-select: none;
  transition: background 0.2s;
}
.page-about__advantage-trigger:hover {
  background: var(--page-color-bg-secondary);
}
.page-about__advantage-num {
  font-family: var(--page-font-mono);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--page-color-brand);
  min-width: 2rem;
}
.page-about__advantage-title {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--page-color-dark);
  flex: 1;
}
.page-about__advantage-icon {
  font-size: 1.6rem;
  font-weight: 300;
  color: var(--page-color-brand);
  transition: transform 0.3s ease;
  line-height: 1;
}
[data-expanded="true"] .page-about__advantage-icon {
  transform: rotate(45deg);
}
.page-about__advantage-content {
  padding: 0 var(--page-spacing-md);
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  background: var(--page-color-bg);
}
[data-expanded="true"] .page-about__advantage-content {
  max-height: 300px;
  padding: var(--page-spacing-sm) var(--page-spacing-md) var(--page-spacing-md);
}
.page-about__advantage-content p {
  margin: 0;
  color: var(--page-color-text-secondary);
  font-size: 0.95rem;
}
.page-about__advantages-visual {
  display: flex;
  justify-content: flex-end;
  margin-top: var(--page-spacing-md);
}
.page-about__refresh-icon {
  max-width: 100%;
  height: auto;
  object-fit: contain;
  border: 2px solid var(--page-color-green);
  box-shadow: var(--page-shadow-strong);
  display: block;
}

/* ── 品牌承诺 ── */
.page-about__promise {
  margin-bottom: var(--page-spacing-xl);
  background: var(--page-color-bg-dark);
  border: var(--page-border-thick);
  box-shadow: var(--page-shadow-strong);
}
.page-about__promise-inner {
  padding: var(--page-spacing-lg) var(--page-spacing-md);
  color: #FFFFFF;
  text-align: center;
}
.page-about__promise-quote {
  margin: var(--page-spacing-md) 0;
  padding: 0;
  border: none;
  font-style: normal;
}
.page-about__promise-quote p {
  font-size: 1.3rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--page-color-brand);
  border-left: 4px solid var(--page-color-brand);
  padding-left: var(--page-spacing-md);
  text-align: left;
  max-width: 780px;
  margin: 0 auto;
}
.page-about__promise-body {
  max-width: 700px;
  margin: var(--page-spacing-md) auto 0;
  font-size: 0.95rem;
  color: rgba(255,255,255,0.8);
  text-align: left;
}
.page-about__promise-body p {
  margin-bottom: var(--page-spacing-sm);
}
.page-about__promise-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--page-spacing-sm);
  justify-content: center;
  margin-top: var(--page-spacing-md);
}
.page-about__link {
  display: inline-block;
  padding: var(--page-spacing-sm) var(--page-spacing-md);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--page-color-dark);
  background: var(--page-color-bg);
  border: 2px solid var(--page-color-border);
  box-shadow: var(--page-shadow-strong);
  text-decoration: none;
  transition: box-shadow 0.2s, transform 0.15s;
}
.page-about__link:hover {
  box-shadow: var(--page-shadow-hover);
  transform: translate(-2px, -2px);
}
.page-about__link:focus-visible {
  outline: 3px solid var(--page-color-brand);
  outline-offset: 2px;
}

/* ── 品牌页脚 ── */
.page-about__brand-footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--page-spacing-sm);
  padding-top: var(--page-spacing-lg);
  border-top: 2px solid var(--page-color-border);
  margin-top: var(--page-spacing-xl);
}
.page-about__brand-logo {
  max-width: 100%;
  height: auto;
  object-fit: contain;
  display: block;
}
.page-about__brand-tagline {
  font-size: 0.9rem;
  color: var(--page-color-text-secondary);
  letter-spacing: 0.06em;
  font-weight: 400;
}

/* ── 等宽索引通用 ── */
.page-about .mono-index {
  font-family: var(--page-font-mono);
  font-weight: 400;
  color: var(--page-color-brand);
  font-size: 0.9rem;
  letter-spacing: 0.04em;
}

/* ── 桌面端（≥768px） ── */
@media (min-width: 768px) {
  .page-about__container {
    padding: var(--page-spacing-lg) var(--page-spacing-md) var(--page-spacing-xl);
  }
  .page-about__story {
    flex-direction: row;
    align-items: flex-start;
  }
  .page-about__story-text {
    order: 1;
    padding-right: var(--page-spacing-lg);
  }
  .page-about__story-visual {
    order: 2;
    justify-content: flex-end;
  }
  .page-about__gradient-img {
    max-width: 500px;
  }
  .page-about__advantages-grid {
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--page-spacing-md);
  }
  .page-about__advantages-visual {
    position: absolute;
    right: 0;
    bottom: 0;
    margin-top: 0;
  }
  .page-about__refresh-icon {
    max-width: 130px;
  }
  .page-about__promise-inner {
    padding: var(--page-spacing-xl) var(--page-spacing-lg);
  }
  .page-about__promise-quote p {
    font-size: 1.5rem;
    padding-left: var(--page-spacing-lg);
  }
  .page-about__heading--promise {
    font-size: 2rem;
  }
  .page-about__brand-tagline {
    font-size: 1rem;
  }
}

/* ── 大桌面端（≥1024px） ── */
@media (min-width: 1024px) {
  .page-about__container {
    padding: var(--page-spacing-xl) var(--page-spacing-lg) var(--page-spacing-xl);
  }
  .page-about__heading {
    font-size: 2.5rem;
  }
  .page-about__heading--sec {
    font-size: 2rem;
  }
  .page-about__gradient-img {
    max-width: 600px;
  }
  .page-about__promise-quote p {
    font-size: 1.7rem;
  }
}
@media (prefers-reduced-motion: reduce) {
  .page-about__advantage-card,
  .page-about__advantage-trigger,
  .page-about__advantage-icon,
  .page-about__advantage-content,
  .page-about__link {
    transition: none !important;
  }
}
</<PAGE_CSS>>

.page-about {
  --page-color-bg-dark: var(--page-color-bg);
}