/* ===== 页面专属样式 —— 品牌介绍（.page-about） ===== */
.page-about {
  --page-accent: var(--color-accent, #FFD700);
  --page-secondary: var(--color-secondary, #00E5FF);
  --page-primary: var(--color-primary, #0A1A2F);
  --page-neutral: var(--color-neutral, #F0F4F8);
  --page-border: var(--color-border, #2A3A5F);
  --page-dark: var(--color-dark, #1A1A2E);
  --page-font-heading: var(--font-heading, 'Inter','Noto Sans SC',sans-serif);
  --page-font-body: var(--font-body, 'JetBrains Mono','Source Han Sans SC',monospace);
  --page-frame-color: var(--page-accent);
  --page-glow: var(--page-secondary);
  --page-grid-size: 24px;
  --page-card-radius: 8px;
  display: block;
  max-width: 100%;
  background-color: var(--page-primary);
  color: var(--page-neutral);
  font-family: var(--page-font-body);
  line-height: 1.7;
}

/* ----- 面包屑 ----- */
.page-about__breadcrumb {
  max-width: 1260px;
  margin: 0 auto;
  padding: 16px 24px 0;
  font-size: 0.8rem;
  color: rgba(240, 244, 248, 0.6);
}
.page-about__breadcrumb a {
  color: var(--page-secondary);
  text-decoration: none;
  transition: opacity 0.2s;
}
.page-about__breadcrumb a:hover,
.page-about__breadcrumb a:focus-visible {
  opacity: 0.75;
  outline: 2px solid var(--page-secondary);
  outline-offset: 2px;
}
.page-about__breadcrumb .breadcrumb__sep {
  margin: 0 8px;
  color: var(--page-accent);
}
.page-about__breadcrumb [aria-current="page"] {
  color: var(--page-accent);
  font-weight: 600;
}

/* ===== 框景首屏 ===== */
.page-about__hero {
  max-width: 1260px;
  margin: 0 auto;
  padding: 24px 24px 48px;
  position: relative;
}
.page-about__frame {
  position: relative;
  border: 3px solid var(--page-frame-color);
  background-color: rgba(10, 26, 47, 0.85);
  padding: 48px 24px;
  min-height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  box-shadow: inset 0 0 60px rgba(255, 215, 0, 0.06), 0 0 40px rgba(0, 229, 255, 0.08);
}
/* 网格背景 */
.page-about__frame-grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 215, 0, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 215, 0, 0.06) 1px, transparent 1px);
  background-size: var(--page-grid-size) var(--page-grid-size);
  z-index: 0;
}
/* 四角坐标刻度 */
.page-about__corner {
  position: absolute;
  z-index: 2;
  pointer-events: none;
}
.page-about__corner--tl { top: 8px; left: 10px; }
.page-about__corner--tr { top: 8px; right: 10px; }
.page-about__corner--bl { bottom: 8px; left: 10px; }
.page-about__corner--br { bottom: 8px; right: 10px; }

.page-about__tick {
  font-family: var(--page-font-body);
  font-size: 0.65rem;
  color: var(--page-accent);
  opacity: 0.5;
  letter-spacing: 0.5px;
}
/* 坐标轴指示 */
.page-about__axis-x {
  position: absolute;
  bottom: 4px;
  right: 12px;
  z-index: 2;
  display: flex;
  gap: 4px;
  font-size: 0.55rem;
  color: var(--page-accent);
  opacity: 0.35;
  pointer-events: none;
  font-family: var(--page-font-body);
}
.page-about__axis-x span + span {
  margin-left: 8px;
}

/* 首屏内容 */
.page-about__hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 720px;
}
.page-about__logo {
  display: block;
  margin: 0 auto 20px;
  max-width: 200px;
  height: auto;
  filter: drop-shadow(0 0 20px rgba(0, 229, 255, 0.35));
  border-radius: 50%;
  background-color: rgba(10, 26, 47, 0.6);
  padding: 8px;
}
.page-about__title {
  font-family: var(--page-font-heading);
  font-size: clamp(1.8rem, 5vw, 3.2rem);
  font-weight: 700;
  color: var(--page-neutral);
  margin: 0 0 12px;
  letter-spacing: 2px;
}
.page-about__tagline {
  font-family: var(--page-font-heading);
  font-size: clamp(1rem, 2.5vw, 1.4rem);
  font-weight: 300;
  color: var(--page-secondary);
  letter-spacing: 6px;
  margin: 0 0 16px;
  text-transform: uppercase;
}
.page-about__manifesto {
  font-size: clamp(0.9rem, 2vw, 1.1rem);
  color: rgba(240, 244, 248, 0.8);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ===== 通用区块 ===== */
.page-about__section {
  max-width: 1260px;
  margin: 0 auto;
  padding: 48px 24px;
  border-bottom: 1px solid rgba(255, 215, 0, 0.12);
}
.page-about__section:last-of-type {
  border-bottom: none;
}
.page-about__section-inner {
  max-width: 1120px;
  margin: 0 auto;
}
.page-about__section-title {
  font-family: var(--page-font-heading);
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 700;
  color: var(--page-neutral);
  margin: 0 0 12px;
  letter-spacing: 1px;
  position: relative;
  display: inline-block;
}
.page-about__section-title::after {
  content: '';
  display: block;
  width: 48px;
  height: 3px;
  background-color: var(--page-accent);
  margin-top: 8px;
}
.page-about__section-desc {
  color: rgba(240, 244, 248, 0.7);
  font-size: 0.95rem;
  margin-bottom: 32px;
  max-width: 600px;
}

/* ----- 内容网格（主内容 + 旁注） ----- */
.page-about__content-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
.page-about__main {
  font-size: 1rem;
  color: rgba(240, 244, 248, 0.88);
}
.page-about__lead {
  font-size: 1.1rem;
  color: var(--page-neutral);
  font-weight: 500;
  margin-bottom: 16px;
  border-left: 3px solid var(--page-secondary);
  padding-left: 16px;
}
.page-about__main p {
  margin: 0 0 14px;
}
.page-about__aside {
  background-color: rgba(10, 26, 47, 0.6);
  border: 1px solid rgba(255, 215, 0, 0.2);
  border-radius: 6px;
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.page-about__aside-title {
  font-family: var(--page-font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--page-accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin: 0;
}
.page-about__note {
  font-size: 0.78rem;
  color: rgba(240, 244, 248, 0.65);
  line-height: 1.6;
  display: block;
}
.page-about__note + .page-about__note {
  margin-top: 4px;
}

/* ----- 金色分隔线 ----- */
.page-about__divider {
  max-width: 1260px;
  margin: 0 auto;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--page-accent) 20%, var(--page-accent) 80%, transparent 100%);
  opacity: 0.4;
}

/* ===== 核心体验卡片区 ===== */
.page-about__cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-bottom: 40px;
}
.page-about__card {
  background-color: rgba(10, 26, 47, 0.75);
  border: 1px solid var(--page-border);
  border-radius: var(--page-card-radius);
  padding: 28px 24px;
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.2s;
  position: relative;
  cursor: default;
}
.page-about__card:hover,
.page-about__card:focus-within {
  border-color: var(--page-secondary);
  box-shadow: 0 0 24px rgba(0, 229, 255, 0.12), inset 0 0 20px rgba(0, 229, 255, 0.04);
  transform: translateY(-2px);
}
.page-about__card-icon {
  color: var(--page-accent);
  margin-bottom: 12px;
  width: 40px;
  height: 40px;
}
.page-about__card-title {
  font-family: var(--page-font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--page-neutral);
  margin: 0 0 8px;
}
.page-about__card-desc {
  font-size: 0.95rem;
  color: rgba(240, 244, 248, 0.8);
  margin: 0 0 12px;
  line-height: 1.7;
}
.page-about__card-detail {
  font-size: 0.88rem;
  color: rgba(240, 244, 248, 0.65);
  line-height: 1.7;
  border-left: 2px solid var(--page-secondary);
  padding-left: 14px;
  margin-bottom: 12px;
  transition: opacity 0.3s, max-height 0.3s;
  max-height: 120px;
  overflow: hidden;
}
.page-about__card-detail p {
  margin: 0;
}
.page-about__card-note {
  font-size: 0.72rem;
  color: rgba(255, 215, 0, 0.55);
  display: block;
  line-height: 1.5;
}

/* ----- 信息图 ----- */
.page-about__infographic {
  margin: 0;
  text-align: center;
}
.page-about__infographic-img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  border: 1px solid rgba(255, 215, 0, 0.15);
  background-color: rgba(10, 26, 47, 0.5);
  object-fit: cover;
}
.page-about__infographic-caption {
  font-size: 0.78rem;
  color: rgba(240, 244, 248, 0.5);
  margin-top: 8px;
}

/* ===== 持续优化 ===== */
.page-about__optimization-figure {
  margin: 32px 0 0;
  text-align: center;
}
.page-about__optimization-img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  border: 1px solid rgba(0, 229, 255, 0.12);
  background-color: rgba(10, 26, 47, 0.4);
  object-fit: cover;
}
.page-about__optimization-caption {
  font-size: 0.78rem;
  color: rgba(240, 244, 248, 0.5);
  margin-top: 8px;
}

/* ===== 内部链接导航 ===== */
.page-about__links {
  max-width: 1260px;
  margin: 0 auto;
  padding: 40px 24px 48px;
  border-top: 1px solid rgba(255, 215, 0, 0.15);
}
.page-about__links-heading {
  font-family: var(--page-font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--page-accent);
  text-align: center;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin: 0 0 20px;
}
.page-about__links-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}
.page-about__link-item {
  text-decoration: none;
  min-width: 140px;
  text-align: center;
  font-family: var(--page-font-heading);
  font-weight: 600;
  font-size: 0.95rem;
}

/* ===== 响应式：平板及以上 ===== */
@media (min-width: 768px) {
  .page-about__hero {
    padding: 32px 40px 56px;
  }
  .page-about__frame {
    padding: 64px 40px;
    min-height: 500px;
  }
  .page-about__content-grid {
    grid-template-columns: 1fr 200px;
    gap: 32px;
  }
  .page-about__cards {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
  .page-about__section {
    padding: 56px 40px;
  }
  .page-about__links {
    padding: 48px 40px 56px;
  }
  .page-about__card-detail {
    max-height: 0;
    opacity: 0;
  }
  .page-about__card:hover .page-about__card-detail,
  .page-about__card:focus-within .page-about__card-detail {
    max-height: 160px;
    opacity: 1;
  }
  .page-about__aside {
    max-height: fit-content;
  }
}

/* ===== 桌面宽屏微调 ===== */
@media (min-width: 1024px) {
  .page-about__frame {
    padding: 80px 64px;
    min-height: 560px;
  }
  .page-about__content-grid {
    grid-template-columns: 1fr 240px;
    gap: 48px;
  }
  .page-about__section {
    padding: 64px 48px;
  }
}

/* ===== 移动端小屏适配 ===== */
@media (max-width: 480px) {
  .page-about__frame {
    padding: 32px 16px;
    min-height: 320px;
    border-width: 2px;
  }
  .page-about__logo {
    max-width: 140px;
  }
  .page-about__title {
    font-size: 1.5rem;
  }
  .page-about__tagline {
    font-size: 0.9rem;
    letter-spacing: 3px;
  }
  .page-about__section {
    padding: 32px 16px;
  }
  .page-about__cards {
    gap: 16px;
  }
  .page-about__card {
    padding: 20px 16px;
  }
  .page-about__corner .page-about__tick {
    font-size: 0.5rem;
  }
  .page-about__links {
    padding: 32px 16px 40px;
  }
  .page-about__link-item {
    min-width: 100px;
    font-size: 0.85rem;
    padding: 10px 18px;
  }
}