/* ===== 品牌简介页专属样式 ===== */
.page-about {
  --page-bg-alt: #13132b;
  --page-glow-heavy: 0 0 12px rgba(123, 47, 247, 0.55), 0 0 28px rgba(0, 229, 255, 0.3);
  --page-number-size: clamp(4.5rem, 14vw, 9rem);
  --page-title-size: clamp(1.8rem, 4.5vw, 3.2rem);
  --page-divider-h: 5px;
  display: block;
}

/* ===== 面包屑 ===== */
.page-about__breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--zb-font-body);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--zb-text-secondary);
  margin-bottom: 1.5rem;
  letter-spacing: 0.04em;
}
.page-about__breadcrumb a {
  color: var(--zb-secondary);
  text-decoration: none;
  transition: color var(--zb-transition);
  border-bottom: 1px solid transparent;
}
.page-about__breadcrumb a:hover,
.page-about__breadcrumb a:focus-visible {
  color: var(--zb-primary);
  border-bottom-color: var(--zb-primary);
}
.page-about__breadcrumb-sep {
  color: var(--zb-primary);
  font-weight: 700;
  opacity: 0.7;
}
.page-about__breadcrumb [aria-current="page"] {
  color: var(--zb-text-primary);
  font-weight: 600;
}

/* ===== 首屏叙事 ===== */
.page-about__hero {
  padding: 2.5rem 0 1.5rem;
  position: relative;
}
.page-about__hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--zb-grad-main);
  opacity: 0.4;
}
.page-about__hero-title {
  font-family: var(--zb-font-heading);
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 900;
  color: var(--zb-text-primary);
  text-shadow: var(--page-glow-heavy);
  margin: 0 0 0.75rem;
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.page-about__hero-desc {
  font-family: var(--zb-font-body);
  font-size: 1.05rem;
  font-weight: 400;
  color: var(--zb-text-secondary);
  max-width: 70ch;
  line-height: 1.7;
  margin: 0;
}

/* ===== 分割线 ===== */
.page-about__divider {
  height: var(--page-divider-h);
  background: var(--zb-grad-main);
  transform: skewY(-0.8deg);
  margin: 0;
  border: 0;
  position: relative;
  z-index: 1;
}

/* ===== 章节通用 ===== */
.page-about__chapter {
  padding: 3rem 0;
  position: relative;
}
.page-about__chapter--1 {
  background-color: var(--zb-bg-dark);
}
.page-about__chapter--2 {
  background-color: var(--page-bg-alt);
}
.page-about__chapter--3 {
  background-color: var(--zb-bg-dark);
}

/* 章节内 flex 容器 — 移动端默认 column */
.page-about__chapter-inner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ===== 章节编号 ===== */
.page-about__number {
  font-family: var(--zb-font-heading);
  font-size: var(--page-number-size);
  font-weight: 900;
  line-height: 1;
  color: var(--zb-primary);
  text-shadow: var(--page-glow-heavy);
  opacity: 0.9;
  user-select: none;
  flex-shrink: 0;
}

/* ===== 章节内容区 ===== */
.page-about__content {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.page-about__chapter-title {
  font-family: var(--zb-font-heading);
  font-size: var(--page-title-size);
  font-weight: 800;
  color: var(--zb-text-primary);
  text-shadow: 0 0 8px rgba(123, 47, 247, 0.45), 0 0 18px rgba(0, 229, 255, 0.25);
  margin: 0;
  line-height: 1.15;
  transition: text-shadow var(--zb-transition), color var(--zb-transition);
  cursor: default;
}
.page-about__chapter-title:hover {
  text-shadow: 0 0 14px rgba(123, 47, 247, 0.7), 0 0 30px rgba(0, 229, 255, 0.45);
  color: var(--zb-secondary);
}
.page-about__chapter-intro {
  font-family: var(--zb-font-body);
  font-size: 1rem;
  font-weight: 400;
  color: var(--zb-text-secondary);
  max-width: 70ch;
  line-height: 1.7;
  margin: 0;
}

/* ===== 原则列表（details/summary） ===== */
.page-about__principles {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 0.5rem;
}
.page-about__principle {
  border: var(--zb-border-width) solid transparent;
  border-image: var(--zb-grad-main) 1;
  background: rgba(26, 26, 46, 0.6);
  transition: background var(--zb-transition), box-shadow var(--zb-transition);
}
.page-about__principle[open] {
  background: rgba(26, 26, 46, 0.9);
  box-shadow: var(--zb-shadow-card), 0 0 12px rgba(123, 47, 247, 0.2);
}
.page-about__principle-title {
  font-family: var(--zb-font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--zb-text-primary);
  padding: 0.85rem 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  list-style: none;
  transition: color var(--zb-transition), background var(--zb-transition);
  user-select: none;
}
.page-about__principle-title::-webkit-details-marker {
  display: none;
}
.page-about__principle-title::marker {
  display: none;
  content: '';
}
.page-about__principle-title:hover {
  color: var(--zb-secondary);
  background: rgba(123, 47, 247, 0.08);
}
.page-about__principle[open] .page-about__principle-title {
  color: var(--zb-secondary);
  border-bottom: 1px solid rgba(0, 229, 255, 0.2);
}
.page-about__principle-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  font-size: 0.8rem;
  font-weight: 800;
  background: var(--zb-grad-main);
  color: var(--zb-bg-dark);
  border-radius: var(--zb-radius);
  flex-shrink: 0;
}
.page-about__principle-body {
  padding: 0 1.2rem 1rem 1.2rem;
  font-family: var(--zb-font-body);
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--zb-text-secondary);
  line-height: 1.7;
  max-width: 68ch;
}
.page-about__principle-body p {
  margin: 0;
}

/* ===== 核心能力卡片 ===== */
.page-about__capabilities {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 0.5rem;
}
.page-about__capability {
  background: var(--zb-bg-card);
  border: var(--zb-border-width) solid transparent;
  border-image: var(--zb-grad-main) 1;
  padding: 1.5rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: transform var(--zb-transition), box-shadow var(--zb-transition), border-image var(--zb-transition);
  cursor: default;
}
.page-about__capability:hover {
  transform: translateY(-4px);
  box-shadow: var(--zb-shadow-card), 0 0 18px rgba(123, 47, 247, 0.25);
  border-image: linear-gradient(135deg, #39FF14, #00E5FF) 1;
}
.page-about__capability-icon {
  font-size: 2.2rem;
  line-height: 1;
  margin-bottom: 0.25rem;
  transition: transform var(--zb-transition);
}
.page-about__capability:hover .page-about__capability-icon {
  transform: scale(1.12);
}
.page-about__capability-title {
  font-family: var(--zb-font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--zb-text-primary);
  margin: 0;
}
.page-about__capability-desc {
  font-family: var(--zb-font-body);
  font-size: 0.92rem;
  font-weight: 400;
  color: var(--zb-text-secondary);
  line-height: 1.65;
  margin: 0;
  max-width: 60ch;
}

/* ===== 应用场景列表 ===== */
.page-about__scenarios {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 0.5rem;
}
.page-about__scenario {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem 1rem;
  background: rgba(26, 26, 46, 0.5);
  border-left: var(--zb-border-width) solid transparent;
  border-image: var(--zb-grad-main) 1;
  transition: background var(--zb-transition), border-image var(--zb-transition), transform var(--zb-transition);
  cursor: default;
}
.page-about__scenario:hover {
  background: rgba(26, 26, 46, 0.85);
  border-image: linear-gradient(135deg, #39FF14, #00E5FF) 1;
  transform: translateX(4px);
}
.page-about__scenario-icon {
  font-size: 1.8rem;
  line-height: 1;
  flex-shrink: 0;
  margin-top: 0.1rem;
  transition: transform var(--zb-transition);
}
.page-about__scenario:hover .page-about__scenario-icon {
  transform: scale(1.1);
}
.page-about__scenario-text {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.page-about__scenario-title {
  font-family: var(--zb-font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--zb-text-primary);
  margin: 0;
}
.page-about__scenario-desc {
  font-family: var(--zb-font-body);
  font-size: 0.92rem;
  font-weight: 400;
  color: var(--zb-text-secondary);
  line-height: 1.65;
  margin: 0;
  max-width: 65ch;
}

/* ===== 图片容器 ===== */
.page-about__figure {
  margin: 1.5rem 0 0;
  padding: 0;
  max-width: 100%;
}
.page-about__img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--zb-border-width) solid transparent;
  border-image: var(--zb-grad-main) 1;
  background: var(--zb-bg-card);
}

/* ===== 内部链接区域 ===== */
.page-about__links-section {
  padding: 3rem 0 2.5rem;
  background: var(--page-bg-alt);
  border-top: var(--page-divider-h) solid transparent;
  border-image: var(--zb-grad-main) 1;
}
.page-about__links-heading {
  font-family: var(--zb-font-heading);
  font-size: clamp(1.4rem, 3.5vw, 2rem);
  font-weight: 800;
  color: var(--zb-text-primary);
  text-shadow: 0 0 8px rgba(123, 47, 247, 0.4);
  margin: 0 0 1.5rem;
  line-height: 1.2;
}
.page-about__links-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}
.page-about__link-item {
  flex: 0 1 auto;
  min-width: 8rem;
  text-align: center;
}

/* ===== 桌面端 ≥768px ===== */
@media (min-width: 768px) {
  .page-about__hero {
    padding: 3.5rem 0 2rem;
  }
  .page-about__chapter {
    padding: 4.5rem 0;
  }
  .page-about__chapter-inner {
    flex-direction: row;
    gap: 3rem;
  }
  .page-about__number {
    width: 7rem;
    text-align: right;
    flex-shrink: 0;
  }
  .page-about__content {
    flex: 1;
    min-width: 0;
  }
  .page-about__chapter-title {
    margin-top: -0.1em;
  }
  .page-about__capabilities {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }
  .page-about__scenarios {
    gap: 1.25rem;
  }
  .page-about__scenario {
    padding: 1.5rem 1.5rem;
  }
  .page-about__figure {
    margin-top: 2rem;
  }
  .page-about__links-section {
    padding: 4rem 0 3rem;
  }
  .page-about__links-grid {
    gap: 1.25rem;
  }
  .page-about__link-item {
    min-width: 10rem;
  }
}

/* ===== 宽屏 ≥1024px ===== */
@media (min-width: 1024px) {
  .page-about__chapter {
    padding: 5.5rem 0;
  }
  .page-about__chapter-inner {
    gap: 4.5rem;
  }
  .page-about__number {
    width: 9rem;
  }
  .page-about__capabilities {
    gap: 1.5rem;
  }
  .page-about__scenarios {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }
  .page-about__scenario {
    flex-direction: column;
    gap: 0.75rem;
    padding: 1.75rem 1.5rem;
    border-left-width: var(--zb-border-width);
    border-top: var(--zb-border-width) solid transparent;
    border-image: var(--zb-grad-main) 1;
  }
  .page-about__scenario:hover {
    transform: translateY(-4px);
  }
  .page-about__figure {
    max-width: 80%;
  }
}