/* ===== 品牌概况页 专属样式 ===== */
.page-about {
  --page-accent: #D4A843;
  --page-electric: #00D4FF;
  --page-bg-card: #1A2A4A;
  --page-border: 4px solid #D4A843;
  --page-shadow: 8px 8px 0 rgba(0,0,0,0.4);
  --page-shadow-sm: 4px 4px 0 rgba(0,0,0,0.3);
  --page-gap: 2rem;
  --page-radius: 0;

  display: block;
  width: 100%;
  background-color: #0A1F3F;
  color: #FFFFFF;
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

.page-about__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 3.5rem;
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: #B0B8C4;
  margin-bottom: 0;
}

.page-about .breadcrumb-link {
  color: #00D4FF;
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: #D4A843;
  outline: 2px solid #D4A843;
  outline-offset: 2px;
}

.page-about .breadcrumb-sep {
  color: #B0B8C4;
  font-weight: 700;
}

.page-about .breadcrumb-item {
  color: #FFFFFF;
  font-weight: 600;
}

/* 品牌定位区 */
.page-about__hero {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  align-items: flex-start;
  position: relative;
}

.page-about__hero-text {
  flex: 1 1 100%;
}

.page-about__hero-title {
  font-size: clamp(2.8rem, 10vw, 5rem);
  font-weight: 800;
  font-style: italic;
  letter-spacing: 0.04em;
  line-height: 1.1;
  color: #D4A843;
  margin: 0 0 0.5rem;
  text-transform: uppercase;
  word-break: break-word;
}

.page-about__hero-sub {
  font-size: 1.25rem;
  font-weight: 600;
  color: #FFFFFF;
  margin: 0 0 1rem;
  max-width: 32em;
}

.page-about__hero-sub strong {
  color: #00D4FF;
  font-weight: 700;
}

.page-about__hero-desc {
  font-size: 1rem;
  color: #B0B8C4;
  margin: 0;
  max-width: 34em;
  line-height: 1.7;
}

.page-about__hero-figure {
  margin: 0;
  flex-shrink: 0;
  width: 100%;
  max-width: 600px;
  border: var(--page-border);
  box-shadow: var(--page-shadow);
  background-color: #1A2A4A;
  transition: box-shadow 0.3s ease;
}

.page-about__hero-figure:hover {
  box-shadow: 12px 12px 0 rgba(0,0,0,0.5);
}

.page-about__hero-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 600 / 400;
}

/* 通用 section 标签 */
.page-about__section-label {
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: #00D4FF;
  margin: 0 0 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid #D4A843;
  display: inline-block;
}

/* 核心功能网格 */
.page-about__features {
  position: relative;
}

.page-about__features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-items: stretch;
}

.page-about .card {
  background-color: #1A2A4A;
  border: var(--page-border);
  box-shadow: var(--page-shadow);
  padding: 1.75rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: box-shadow 0.3s ease, border-color 0.3s ease;
  position: relative;
}

.page-about .card:hover {
  box-shadow: 12px 12px 0 rgba(0,0,0,0.5);
  border-color: #00D4FF;
}

.page-about .card:focus-within {
  border-color: #00D4FF;
  outline: none;
}

.card__number {
  font-family: "JetBrains Mono", "Fira Code", monospace;
  font-size: 3rem;
  font-weight: 700;
  line-height: 1;
  color: #D4A843;
  opacity: 0.3;
  position: absolute;
  top: 0.5rem;
  right: 0.75rem;
  pointer-events: none;
  user-select: none;
}

.page-about .card-title {
  font-size: 1.5rem;
  font-weight: 700;
  font-style: italic;
  color: #FFFFFF;
  margin: 0;
}

.page-about .card-text {
  font-size: 0.95rem;
  color: #B0B8C4;
  margin: 0;
  flex: 1 1 auto;
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.4rem;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  border: 3px solid #D4A843;
  background-color: transparent;
  color: #D4A843;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
  align-self: flex-start;
  margin-top: 0.25rem;
}

.page-about .btn:hover,
.page-about .btn:focus-visible {
  background-color: #D4A843;
  color: #0A1F3F;
  box-shadow: 4px 4px 0 rgba(0,0,0,0.3);
  outline: none;
}

.page-about .btn-primary {
  background-color: #D4A843;
  color: #0A1F3F;
  border-color: #D4A843;
  box-shadow: 4px 4px 0 rgba(0,0,0,0.3);
}

.page-about .btn-primary:hover,
.page-about .btn-primary:focus-visible {
  background-color: #00D4FF;
  border-color: #00D4FF;
  color: #0A1F3F;
  box-shadow: 6px 6px 0 rgba(0,0,0,0.4);
}

.page-about .btn-secondary {
  background-color: transparent;
  color: #D4A843;
  border-color: #D4A843;
}

.page-about .btn-secondary:hover,
.page-about .btn-secondary:focus-visible {
  background-color: #D4A843;
  color: #0A1F3F;
}

/* 技术承诺区 */
.page-about__tech {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  align-items: flex-start;
  background-color: transparent;
  border-left: 4px solid #00D4FF;
  padding-left: 1.5rem;
}

.page-about__tech-content {
  flex: 1 1 100%;
}

.page-about__tech-statement {
  font-size: 1.15rem;
  font-weight: 500;
  color: #FFFFFF;
  margin: 0 0 1.25rem;
  max-width: 32em;
}

.page-about__tech-statement strong {
  color: #00D4FF;
  font-weight: 700;
}

.page-about__tech-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.page-about__tech-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1rem;
  color: #B0B8C4;
  font-family: "JetBrains Mono", "Fira Code", monospace;
}

.page-about__tech-icon {
  font-size: 1.2rem;
  color: #D4A843;
  width: 1.6rem;
  text-align: center;
  font-family: "Noto Sans SC", sans-serif;
}

.page-about__tech-figure {
  margin: 0;
  flex-shrink: 0;
  width: 200px;
  height: 200px;
  border: 3px solid #D4A843;
  box-shadow: var(--page-shadow-sm);
  background-color: #1A2A4A;
  transition: box-shadow 0.3s ease;
}

.page-about__tech-figure:hover {
  box-shadow: 8px 8px 0 rgba(0,0,0,0.4);
}

.page-about__tech-img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 1 / 1;
}

/* 本地化服务区 */
.page-about__local {
  position: relative;
}

.page-about__local-grid {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  align-items: flex-start;
}

.page-about__local-info {
  flex: 1 1 100%;
}

.page-about__local-text {
  font-size: 1rem;
  color: #FFFFFF;
  margin: 0 0 1.5rem;
  max-width: 36em;
  line-height: 1.7;
}

.page-about__local-meta {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin: 0 0 1.5rem;
  padding: 0;
}

.page-about__local-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  font-size: 0.95rem;
}

.page-about__local-meta-row dt {
  font-weight: 700;
  color: #D4A843;
  min-width: 5.5em;
}

.page-about__local-meta-row dd {
  margin: 0;
  color: #FFFFFF;
  word-break: break-word;
}

.page-about__link {
  color: #00D4FF;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s ease;
}

.page-about__link:hover,
.page-about__link:focus-visible {
  color: #D4A843;
  outline: 2px solid #D4A843;
  outline-offset: 2px;
}

.page-about__local-note {
  font-size: 0.85rem;
  color: #B0B8C4;
  margin: 0 0 1.5rem;
  max-width: 28em;
}

.page-about__local-figure {
  margin: 0;
  flex-shrink: 0;
  width: 100px;
  height: 100px;
  border: 3px solid #D4A843;
  box-shadow: var(--page-shadow-sm);
  background-color: #1A2A4A;
  transition: box-shadow 0.3s ease;
}

.page-about__local-figure:hover {
  box-shadow: 8px 8px 0 rgba(0,0,0,0.4);
}

.page-about__local-img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 1 / 1;
}

/* 底部信任声明 */
.page-about__trust {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: flex-start;
  padding: 2rem 1.5rem;
  background-color: #1A2A4A;
  border-left: 4px solid #D4A843;
  box-shadow: var(--page-shadow-sm);
}

.page-about__trust-text {
  font-size: 1rem;
  color: #B0B8C4;
  margin: 0;
  max-width: 34em;
  line-height: 1.7;
}

/* ===== 交互：悬停卡片显示详情（渐进增强） ===== */
.page-about__feature-card[data-hover-detail] {
  position: relative;
  cursor: default;
}

.page-about__feature-card[data-hover-detail]::after {
  content: attr(data-hover-detail);
  position: absolute;
  bottom: calc(100% + 0.75rem);
  left: 50%;
  transform: translateX(-50%);
  max-width: 22em;
  width: max-content;
  padding: 0.6rem 1rem;
  background-color: #0A1F3F;
  border: 2px solid #00D4FF;
  color: #FFFFFF;
  font-size: 0.85rem;
  line-height: 1.5;
  white-space: normal;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.25s ease;
  z-index: 10;
  box-shadow: 4px 4px 0 rgba(0,0,0,0.3);
}

.page-about__feature-card[data-hover-detail]:hover::after,
.page-about__feature-card[data-hover-detail]:focus-within::after {
  opacity: 1;
}

/* ===== 桌面端媒体查询 ===== */
@media (min-width: 768px) {
  .page-about__inner {
    padding: 3rem 2.5rem 5rem;
    gap: 5rem;
  }

  .page-about__hero {
    flex-direction: row;
    align-items: center;
    gap: 3rem;
  }

  .page-about__hero-text {
    flex: 1 1 55%;
  }

  .page-about__hero-figure {
    flex: 0 0 45%;
    max-width: 600px;
  }

  .page-about__features-grid {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
    gap: 1.75rem;
  }

  .page-about__feature-card--tall {
    grid-row: span 2;
    align-self: stretch;
  }

  .page-about__feature-card--wide {
    grid-column: span 2;
  }

  .page-about__tech {
    flex-direction: row;
    align-items: center;
    gap: 3rem;
    padding-left: 2.5rem;
  }

  .page-about__tech-content {
    flex: 1 1 60%;
  }

  .page-about__tech-figure {
    flex: 0 0 200px;
  }

  .page-about__local-grid {
    flex-direction: row;
    align-items: flex-start;
    gap: 3rem;
  }

  .page-about__local-info {
    flex: 1 1 65%;
  }

  .page-about__local-figure {
    flex: 0 0 100px;
    margin-top: 0.5rem;
  }

  .page-about__trust {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 2rem 2.5rem;
  }

  .page-about__trust-text {
    flex: 1 1 auto;
    margin-right: 2rem;
  }

  .page-about__trust .btn {
    flex-shrink: 0;
  }
}

@media (min-width: 1024px) {
  .page-about__inner {
    padding: 3.5rem 3rem 6rem;
    gap: 6rem;
  }

  .page-about__features-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }

  .page-about__feature-card--tall {
    grid-row: span 2;
  }

  .page-about__feature-card--wide {
    grid-column: span 2;
  }

  .page-about__hero-title {
    font-size: 5rem;
  }
}