/* ===== 品牌档案专属样式 ===== */
.page-about {
  --page-gold: #FFD700;
  --page-red: #B22222;
  --page-dark: #2F2F2F;
  --page-darker: #1A1A1A;
  --page-light: #F5F5F5;
  --page-mid: #6B6B6B;
  --page-font-heading: "Impact","Arial Black","Helvetica Neue",sans-serif;
  --page-font-body: "Segoe UI","Helvetica Neue",Arial,sans-serif;
  --page-transition: 0.35s ease;
  --page-side-width: 80px;
  color: var(--page-light);
  background: var(--page-darker);
  font-family: var(--page-font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* 容器 */
.page-about__container {
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
  padding: 0 1rem 2rem;
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  font-family: Arial, sans-serif;
  letter-spacing: 0.03em;
  color: var(--page-mid);
  margin-bottom: 1rem;
  padding-top: 0.5rem;
}
.page-about .breadcrumb a {
  color: var(--page-gold);
  text-decoration: none;
  transition: opacity var(--page-transition);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  opacity: 0.75;
  outline: 2px solid var(--page-gold);
  outline-offset: 2px;
}
.page-about .breadcrumb__sep {
  color: var(--page-mid);
  user-select: none;
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--page-light);
  font-weight: 600;
}

/* 页面标题区 */
.page-about__title {
  font-family: var(--page-font-heading);
  font-size: clamp(2rem, 6vw, 3.6rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--page-gold);
  margin: 0 0 0.2rem;
  text-transform: uppercase;
  line-height: 1.1;
  position: relative;
}
.page-about__title::after {
  content: "";
  display: block;
  width: 4rem;
  height: 4px;
  background: var(--page-red);
  margin-top: 0.5rem;
  border-radius: 2px;
}
.page-about__subtitle {
  font-size: clamp(0.9rem, 2vw, 1.15rem);
  color: var(--page-mid);
  margin: 0.2rem 0 2rem;
  letter-spacing: 0.04em;
  font-weight: 400;
}

/* ===== 章节系统 ===== */
.page-about .chapter {
  position: relative;
  display: flex;
  flex-direction: column;
  margin-bottom: 2.5rem;
  background: var(--page-dark);
  border: 1px solid rgba(255, 215, 0, 0.12);
  box-shadow:
    0 2px 6px rgba(0, 0, 0, 0.35),
    0 8px 24px rgba(0, 0, 0, 0.2);
  transition: box-shadow var(--page-transition);
  cursor: default;
}
.page-about .chapter:hover {
  box-shadow:
    0 4px 12px rgba(0, 0, 0, 0.4),
    0 12px 32px rgba(0, 0, 0, 0.25);
}

/* 侧边色带编号 */
.page-about .chapter__side {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--page-red);
  padding: 0.6rem 1rem;
  border-bottom: 2px solid var(--page-gold);
  flex-shrink: 0;
}
.page-about .chapter__number {
  font-family: var(--page-font-heading);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--page-gold);
  line-height: 1;
  letter-spacing: 0.04em;
}
.page-about .chapter__label {
  font-family: Arial, sans-serif;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--page-light);
  opacity: 0.85;
  font-weight: 600;
}

/* 内容区 */
.page-about .chapter__content {
  padding: 1.2rem 1rem 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.page-about .chapter__heading {
  font-family: var(--page-font-heading);
  font-size: clamp(1.3rem, 3.5vw, 1.9rem);
  font-weight: 700;
  color: var(--page-gold);
  margin: 0 0 0.4rem;
  letter-spacing: 0.03em;
  line-height: 1.2;
  position: relative;
  padding-left: 0.75rem;
  border-left: 4px solid var(--page-red);
}
.page-about .chapter__text p {
  margin: 0 0 0.8rem;
  color: var(--page-light);
  font-size: clamp(0.95rem, 1.5vw, 1.05rem);
  max-width: 70ch;
}
.page-about .chapter__text p:last-child {
  margin-bottom: 0;
}

/* 图片 */
.page-about .chapter__figure {
  margin: 0.6rem 0 0;
  border: 1px solid rgba(255, 215, 0, 0.18);
  padding: 4px;
  background: var(--page-darker);
  box-shadow: inset 0 0 0 1px rgba(255, 215, 0, 0.08);
}
.page-about .chapter__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: attr(width) / attr(height);
}
.page-about .chapter__figcap {
  font-size: 0.72rem;
  font-family: Arial, sans-serif;
  color: var(--page-mid);
  padding: 0.4rem 0.3rem 0.1rem;
  letter-spacing: 0.03em;
  font-style: italic;
}

/* ===== 服务卡片网格 ===== */
.page-about .services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.8rem;
  margin: 0.2rem 0 0.2rem;
}
.page-about .service-card {
  background: var(--page-darker);
  border: 1px solid rgba(255, 215, 0, 0.1);
  padding: 0.9rem 1rem 0.8rem;
  box-shadow:
    0 1px 3px rgba(0, 0, 0, 0.25),
    inset 0 0 0 1px rgba(255, 215, 0, 0.03);
  transition: border-color var(--page-transition), box-shadow var(--page-transition);
}
.page-about .service-card:hover {
  border-color: rgba(255, 215, 0, 0.35);
  box-shadow:
    0 2px 8px rgba(0, 0, 0, 0.3),
    inset 0 0 0 1px rgba(255, 215, 0, 0.06);
}
.page-about .service-card__title {
  font-family: var(--page-font-heading);
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  font-weight: 700;
  color: var(--page-gold);
  margin: 0 0 0.25rem;
  letter-spacing: 0.03em;
}
.page-about .service-card__desc {
  font-size: 0.88rem;
  color: var(--page-light);
  margin: 0 0 0.4rem;
  line-height: 1.5;
  max-width: 55ch;
}
.page-about .service-card__link {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--page-red);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: color var(--page-transition);
  border-bottom: 1px solid transparent;
}
.page-about .service-card__link:hover,
.page-about .service-card__link:focus-visible {
  color: var(--page-gold);
  border-bottom-color: var(--page-gold);
  outline: none;
}
.page-about .service-card__link:focus-visible {
  outline: 2px solid var(--page-gold);
  outline-offset: 2px;
}

/* ===== 联系方式区块 ===== */
.page-about .contact-details {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  margin: 0.2rem 0 0.5rem;
  background: rgba(0, 0, 0, 0.25);
  padding: 0.8rem 1rem;
  border-left: 4px solid var(--page-gold);
}
.page-about .contact-details__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.3rem 0.6rem;
  font-size: 0.92rem;
}
.page-about .contact-details__label {
  font-weight: 700;
  color: var(--page-gold);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  min-width: 4.5em;
}
.page-about .contact-details__value {
  color: var(--page-light);
  word-break: break-all;
}
.page-about .contact-details__note {
  font-size: 0.75rem;
  color: var(--page-mid);
  font-style: italic;
}
.page-about .contact-details__footnote {
  font-size: 0.8rem;
  color: var(--page-mid);
  margin: 0.3rem 0 0;
  padding-top: 0.4rem;
  border-top: 1px solid rgba(255, 215, 0, 0.1);
  max-width: 65ch;
}

/* 复制按钮 */
.page-about .btn-copy {
  background: transparent;
  border: 1px solid var(--page-gold);
  color: var(--page-gold);
  font-size: 0.68rem;
  font-weight: 600;
  padding: 0.2rem 0.7rem;
  cursor: pointer;
  letter-spacing: 0.04em;
  transition: background var(--page-transition), color var(--page-transition);
  font-family: inherit;
  line-height: 1.4;
}
.page-about .btn-copy:hover,
.page-about .btn-copy:focus-visible {
  background: var(--page-gold);
  color: var(--page-darker);
  outline: none;
}
.page-about .btn-copy:focus-visible {
  outline: 2px solid var(--page-light);
  outline-offset: 2px;
}

/* ===== 承诺横幅 ===== */
.page-about .commitment-banner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.6rem 1.2rem;
  margin-top: 1.5rem;
  padding: 0.9rem 1rem;
  background: var(--page-red);
  border: 1px solid var(--page-gold);
  box-shadow:
    inset 0 0 0 2px rgba(255, 215, 0, 0.15),
    0 4px 16px rgba(0, 0, 0, 0.3);
}
.page-about .commitment-banner__icon {
  color: var(--page-gold);
  font-size: 1.1rem;
  user-select: none;
  flex-shrink: 0;
}
.page-about .commitment-banner__text {
  font-size: clamp(0.82rem, 1.8vw, 1rem);
  font-weight: 600;
  color: var(--page-light);
  margin: 0;
  text-align: center;
  letter-spacing: 0.03em;
  max-width: 60ch;
}

/* ===== 折叠交互：渐进增强 ===== */
.page-about .chapter[data-collapsible="section"] .chapter__content {
  display: block;
}

/* ===== 响应式：平板及以上 ===== */
@media (min-width: 680px) {
  .page-about__container {
    padding: 0 1.5rem 3rem;
  }
  .page-about .chapter {
    flex-direction: row;
    margin-bottom: 3rem;
  }
  .page-about .chapter__side {
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: var(--page-side-width);
    min-width: var(--page-side-width);
    padding: 1rem 0.6rem;
    border-bottom: none;
    border-right: 2px solid var(--page-gold);
    gap: 0.4rem;
  }
  .page-about .chapter__number {
    font-size: 2.4rem;
  }
  .page-about .chapter__label {
    font-size: 0.65rem;
    writing-mode: vertical-lr;
    text-orientation: mixed;
  }
  .page-about .chapter__content {
    flex: 1;
    padding: 1.5rem 1.8rem 1.8rem;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: flex-start;
    gap: 1.2rem 2rem;
  }
  .page-about .chapter__heading {
    width: 100%;
  }
  .page-about .chapter__text {
    flex: 1 1 280px;
  }
  .page-about .chapter__figure {
    flex: 0 1 auto;
    max-width: 400px;
    margin: 0.2rem 0 0 auto;
  }
  .page-about .services-grid {
    grid-template-columns: 1fr 1fr;
    width: 100%;
  }
  .page-about .contact-details {
    flex: 1 1 100%;
  }
  .page-about .commitment-banner {
    margin-top: 2rem;
    padding: 1.2rem 2rem;
  }
}

/* ===== 响应式：桌面宽屏 ===== */
@media (min-width: 1024px) {
  .page-about__container {
    padding: 0 2rem 4rem;
  }
  .page-about .chapter__side {
    width: 100px;
    min-width: 100px;
    padding: 1.4rem 0.8rem;
  }
  .page-about .chapter__number {
    font-size: 3rem;
  }
  .page-about .chapter__content {
    padding: 2rem 2.4rem 2.2rem;
    gap: 1.5rem 2.5rem;
  }
  .page-about .chapter__figure {
    max-width: 480px;
  }
  .page-about .services-grid {
    gap: 1rem;
  }
  .page-about .service-card {
    padding: 1rem 1.2rem 0.9rem;
  }
  .page-about .contact-details {
    padding: 1rem 1.4rem;
  }
  .page-about .commitment-banner {
    padding: 1.5rem 3rem;
    gap: 1rem 2rem;
  }
}