/* ===== 品牌俯瞰页面专属样式 ===== */
.page-about {
  --about-gold: #FFD700;
  --about-red: #DC143C;
  --about-blue: #00BFFF;
  --about-bg-card: #1A1A1A;
  --about-border-light: #333333;
  --about-stack-shadow: 0 6px 12px rgba(0, 0, 0, 0.5), 0 2px 4px rgba(0, 0, 0, 0.3);
  --about-stack-shadow-hover: 0 10px 20px rgba(220, 20, 60, 0.15), 0 4px 8px rgba(0, 0, 0, 0.4);
  --about-skew-angle: 2deg;

  display: flex;
  flex-direction: column;
  gap: 0;
  background-color: var(--color-bg, #0A0A0A);
  color: var(--color-text, #FFFFFF);
  font-family: var(--font-body, 'Inter', sans-serif);
  line-height: 1.6;
  overflow-x: hidden;
}

/* 容器与通用间距 */
.page-about .container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--container-padding, 20px);
}

/* 面包屑 */
.about-breadcrumb {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px var(--container-padding, 20px) 0;
  font-size: 0.8rem;
  color: var(--color-text-secondary, #B0B0B0);
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body, 'Inter', sans-serif);
}
.about-breadcrumb a {
  color: var(--about-gold);
  text-decoration: none;
  transition: color 0.2s;
}
.about-breadcrumb a:hover {
  color: var(--about-red);
}
.about-breadcrumb__sep {
  color: var(--color-border, #333);
  user-select: none;
}

/* ===== HERO ===== */
.about-hero {
  position: relative;
  overflow: hidden;
  padding: 60px 0 50px;
  text-align: center;
  background: linear-gradient(160deg, #0A0A0A 0%, #1A1A1A 100%);
  border-bottom: 2px solid var(--about-red);
}
.about-hero__bg-text {
  position: absolute;
  top: -10%;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-heading, 'Oswald', sans-serif);
  font-size: clamp(6rem, 20vw, 16rem);
  font-weight: 900;
  color: rgba(220, 20, 60, 0.06);
  white-space: nowrap;
  pointer-events: none;
  user-select: none;
  letter-spacing: 0.05em;
  line-height: 1;
}
.about-hero__inner {
  position: relative;
  z-index: 2;
}
.about-hero__logo-wrap {
  display: inline-block;
  margin-bottom: 24px;
  padding: 8px;
  border: 2px solid var(--about-gold);
  border-radius: 50%;
  background: rgba(255, 215, 0, 0.05);
  box-shadow: 0 0 30px rgba(255, 215, 0, 0.1);
}
.about-hero__logo {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 50%;
  object-fit: cover;
}
.about-hero__title {
  font-family: var(--font-heading, 'Oswald', sans-serif);
  font-size: clamp(2rem, 5vw, 3.6rem);
  font-weight: 700;
  color: var(--color-text, #FFFFFF);
  margin: 0 0 16px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.about-hero__desc {
  max-width: 680px;
  margin: 0 auto;
  font-size: 1rem;
  color: var(--color-text-secondary, #B0B0B0);
  line-height: 1.7;
  padding: 0 20px;
}

/* ===== 章节通用 ===== */
.page-about .section {
  padding: 60px 0 50px;
  position: relative;
}
.page-about .section__header {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 48px;
  position: relative;
}
.page-about .section__number {
  font-family: var(--font-heading, 'Oswald', sans-serif);
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 900;
  color: var(--about-red);
  line-height: 1;
  opacity: 0.25;
  user-select: none;
  flex-shrink: 0;
}
.page-about .section__heading {
  font-family: var(--font-heading, 'Oswald', sans-serif);
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  font-weight: 700;
  color: var(--color-text, #FFFFFF);
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  border-left: 4px solid var(--about-gold);
  padding-left: 16px;
}

/* ===== 纸张叠层共用 ===== */
.page-about .paper-stack {
  background: var(--about-bg-card);
  border: 1px solid var(--about-border-light);
  box-shadow: var(--about-stack-shadow);
  transition: box-shadow 0.3s, transform 0.3s, border-color 0.3s;
  position: relative;
}
.page-about .paper-stack:hover {
  box-shadow: var(--about-stack-shadow-hover);
  border-color: rgba(255, 215, 0, 0.3);
}

/* ===== 标签 ===== */
.page-about .tag {
  display: inline-block;
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 4px 12px;
  border-radius: 2px;
  text-transform: uppercase;
  background: transparent;
}
.page-about .tag--gold {
  color: var(--about-gold);
  border: 1px solid var(--about-gold);
}
.page-about .tag--blue {
  color: var(--about-blue);
  border: 1px solid var(--about-blue);
}

/* ===== 01 品牌叙事 ===== */
.about-narrative {
  position: relative;
}
.about-narrative::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--about-red), transparent);
  opacity: 0.4;
}
.about-narrative__grid {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 40px;
}
.about-narrative__card {
  padding: 32px 28px;
  border-radius: 0;
  position: relative;
  transform: none;
  transition: transform 0.4s, box-shadow 0.4s;
  /* 纸张叠层增强：多层背景 */
  background-image: 
    linear-gradient(135deg, rgba(255, 215, 0, 0.02) 0%, transparent 50%),
    linear-gradient(45deg, rgba(220, 20, 60, 0.02) 100%, transparent 50%),
    var(--about-bg-card);
}
.about-narrative__card::after {
  content: '';
  position: absolute;
  right: 12px;
  bottom: 12px;
  width: 40px;
  height: 40px;
  border-right: 2px solid var(--about-gold);
  border-bottom: 2px solid var(--about-gold);
  opacity: 0.15;
  pointer-events: none;
}
.about-narrative__card-title {
  font-family: var(--font-heading, 'Oswald', sans-serif);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--color-text, #FFFFFF);
  margin: 12px 0 8px;
  letter-spacing: 0.01em;
}
.about-narrative__card-text {
  font-size: 0.9rem;
  color: var(--color-text-secondary, #B0B0B0);
  margin: 0 0 16px;
  line-height: 1.7;
}
.about-narrative__code {
  font-family: var(--font-mono, 'Fira Code', monospace);
  color: var(--about-blue);
  background: rgba(0, 191, 255, 0.08);
  padding: 2px 6px;
  border-radius: 2px;
  font-size: 0.85em;
}
.about-narrative__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--about-gold);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s, color 0.2s;
}
.about-narrative__link:hover {
  border-bottom-color: var(--about-gold);
  color: var(--about-red);
}
.about-narrative__figure {
  margin: 0;
  text-align: center;
}
.about-narrative__img {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--about-border-light);
  box-shadow: var(--about-stack-shadow);
  object-fit: cover;
}

/* ===== 02 内容架构（网络关系图） ===== */
.about-architecture {
  background: linear-gradient(180deg, #0A0A0A 0%, #0F0F0F 100%);
  border-top: 1px solid var(--about-border-light);
  border-bottom: 1px solid var(--about-border-light);
}
.about-architecture__network {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 40px 24px 32px;
  margin-bottom: 32px;
  min-height: 320px;
  /* 纸张叠层 */
  background-image: 
    radial-gradient(circle at 20% 30%, rgba(255, 215, 0, 0.02) 0%, transparent 60%),
    var(--about-bg-card);
}
/* 中心节点 */
.network__center {
  position: relative;
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: var(--about-red);
  border: 3px solid var(--about-gold);
  box-shadow: 0 0 30px rgba(220, 20, 60, 0.25), 0 0 60px rgba(255, 215, 0, 0.08);
  flex-shrink: 0;
  margin: 0 0 16px;
}
.network__label {
  font-family: var(--font-heading, 'Oswald', sans-serif);
  font-size: 0.9rem;
  font-weight: 700;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  line-height: 1.2;
}
.network__sub-label {
  font-size: 0.6rem;
  color: rgba(255, 255, 255, 0.7);
  font-weight: 400;
}
/* SVG连接线 */
.network__lines {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
  opacity: 0.5;
}
/* 周围节点 */
.network__node {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 12px 16px;
  background: rgba(26, 26, 26, 0.9);
  border: 1px solid var(--about-border-light);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
  cursor: default;
  transition: border-color 0.3s, background 0.3s, transform 0.3s;
  min-width: 90px;
  text-align: center;
}
.network__node:hover {
  border-color: var(--about-gold);
  background: rgba(26, 26, 26, 1);
  transform: translateY(-2px);
}
.network__node-icon {
  font-size: 1.3rem;
  line-height: 1;
}
.network__node-name {
  font-family: var(--font-heading, 'Oswald', sans-serif);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text, #FFFFFF);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.network__node-detail {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: #111;
  border: 1px solid var(--about-gold);
  padding: 6px 12px;
  font-size: 0.7rem;
  color: var(--color-text-secondary, #B0B0B0);
  white-space: nowrap;
  z-index: 10;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.6);
}
.network__node:hover .network__node-detail {
  display: block;
}
/* 为支持渐进增强，默认隐藏detail，hover显示 */
.about-architecture__figure {
  margin: 0 0 20px;
  text-align: center;
}
.about-architecture__img {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--about-border-light);
  box-shadow: var(--about-stack-shadow);
  object-fit: cover;
}
.about-architecture__footnote {
  font-size: 0.85rem;
  color: var(--color-text-secondary, #B0B0B0);
  text-align: center;
  margin: 0;
  padding-top: 8px;
  border-top: 1px solid var(--about-border-light);
}
.about-architecture__link {
  color: var(--about-gold);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s;
}
.about-architecture__link:hover {
  color: var(--about-red);
}

/* ===== 03 数据索引逻辑 ===== */
.about-index {
  position: relative;
}
.about-index__content {
  display: flex;
  flex-direction: column;
  gap: 32px;
  padding: 36px 28px;
  /* 纸张叠层增强 */
  background-image: 
    linear-gradient(135deg, rgba(0, 191, 255, 0.02) 0%, transparent 50%),
    linear-gradient(45deg, rgba(220, 20, 60, 0.02) 100%, transparent 50%),
    var(--about-bg-card);
}
.about-index__text {
  flex: 1;
}
.about-index__text p {
  font-size: 0.95rem;
  color: var(--color-text-secondary, #B0B0B0);
  margin: 0 0 16px;
  line-height: 1.8;
}
.about-index__highlight {
  color: var(--about-red);
  font-weight: 600;
}
.about-index__code {
  font-family: var(--font-mono, 'Fira Code', monospace);
  color: var(--about-blue);
  background: rgba(0, 191, 255, 0.08);
  padding: 2px 8px;
  border-radius: 2px;
  font-size: 0.85em;
}
.about-index__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 24px;
}
.about-index__btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: var(--about-red);
  color: #fff;
  font-family: var(--font-heading, 'Oswald', sans-serif);
  font-size: 0.95rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background 0.3s, transform 0.2s;
  box-shadow: 0 4px 12px rgba(220, 20, 60, 0.25);
}
.about-index__btn:hover {
  background: var(--color-primary-hover, #FF4500);
  transform: translateY(-1px);
}
.about-index__chart {
  flex: 1;
  min-width: 0;
}
.about-index__svg {
  width: 100%;
  height: auto;
  display: block;
  max-width: 360px;
  margin: 0 auto;
  filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.4));
}
.about-index__chart-caption {
  font-size: 0.7rem;
  color: var(--color-text-secondary, #B0B0B0);
  text-align: center;
  margin: 8px 0 0;
  letter-spacing: 0.02em;
}

/* ===== 内部链接导航 ===== */
.about-links {
  padding: 40px 0 60px;
  border-top: 1px solid var(--about-border-light);
}
.about-links__inner {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.about-links__item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  text-decoration: none;
  color: var(--color-text, #FFFFFF);
  border-left: 4px solid var(--about-red);
  transition: border-left-color 0.3s, background 0.3s, transform 0.2s;
  /* 纸张叠层继承 .paper-stack */
}
.about-links__item:hover {
  border-left-color: var(--about-gold);
  background: rgba(255, 215, 0, 0.03);
  transform: translateX(4px);
}
.about-links__item-num {
  font-family: var(--font-heading, 'Oswald', sans-serif);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--about-red);
  line-height: 1;
  flex-shrink: 0;
  width: 36px;
  text-align: center;
  transition: color 0.3s;
}
.about-links__item:hover .about-links__item-num {
  color: var(--about-gold);
}
.about-links__item-label {
  font-family: var(--font-heading, 'Oswald', sans-serif);
  font-size: 1.1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.about-links__item-desc {
  font-size: 0.8rem;
  color: var(--color-text-secondary, #B0B0B0);
  margin-left: auto;
  text-align: right;
}

/* ===== 响应式：桌面端 ===== */
@media (min-width: 768px) {
  .about-hero {
    padding: 80px 0 70px;
  }
  .about-hero__title {
    font-size: 3.6rem;
  }

  /* 品牌叙事：三栏斜切 */
  .about-narrative__grid {
    flex-direction: row;
    gap: 20px;
  }
  .about-narrative__card {
    flex: 1;
    transform: skewX(calc(var(--about-skew-angle) * -1));
    padding: 36px 32px 40px;
  }
  .about-narrative__card > * {
    transform: skewX(var(--about-skew-angle));
  }
  .about-narrative__card--skew-left {
    transform: skewX(calc(var(--about-skew-angle) * -1));
  }
  .about-narrative__card--skew-left > * {
    transform: skewX(var(--about-skew-angle));
  }
  .about-narrative__card--skew-center {
    transform: skewX(0deg);
    margin-top: -8px;
    margin-bottom: -8px;
  }
  .about-narrative__card--skew-center > * {
    transform: skewX(0deg);
  }
  .about-narrative__card--skew-right {
    transform: skewX(var(--about-skew-angle));
  }
  .about-narrative__card--skew-right > * {
    transform: skewX(calc(var(--about-skew-angle) * -1));
  }
  .about-narrative__card:hover {
    transform: skewX(calc(var(--about-skew-angle) * -1)) translateY(-4px);
  }
  .about-narrative__card--skew-center:hover {
    transform: translateY(-4px);
  }
  .about-narrative__card--skew-right:hover {
    transform: skewX(var(--about-skew-angle)) translateY(-4px);
  }

  /* 内容架构：网络图水平布局 */
  .about-architecture__network {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    gap: 24px 40px;
    padding: 50px 32px 40px;
  }
  .network__center {
    width: 120px;
    height: 120px;
    margin: 0 0 8px;
    flex-basis: 100%;
  }
  .network__center .network__label {
    font-size: 1.1rem;
  }
  .network__node {
    padding: 14px 20px;
    min-width: 100px;
  }
  .network__lines {
    opacity: 0.7;
  }

  /* 数据索引逻辑：并排 */
  .about-index__content {
    flex-direction: row;
    align-items: flex-start;
    gap: 40px;
    padding: 48px 40px;
  }
  .about-index__text {
    flex: 0 0 55%;
  }
  .about-index__chart {
    flex: 0 0 40%;
    padding-top: 12px;
  }
  .about-index__svg {
    max-width: 100%;
  }

  /* 链接导航：三栏 */
  .about-links__inner {
    flex-direction: row;
    gap: 20px;
  }
  .about-links__item {
    flex: 1;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
    padding: 28px 24px;
  }
  .about-links__item-desc {
    margin-left: 0;
    text-align: left;
  }
}

/* 桌面大屏微调 */
@media (min-width: 1024px) {
  .about-narrative__grid {
    gap: 28px;
  }
  .about-architecture__network {
    gap: 32px 56px;
    padding: 60px 48px 48px;
  }
  .network__center {
    width: 140px;
    height: 140px;
  }
  .network__center .network__label {
    font-size: 1.3rem;
  }
  .network__node {
    padding: 16px 24px;
    min-width: 120px;
  }
  .network__node-name {
    font-size: 0.9rem;
  }
}

/* 确保所有图片响应 */
.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* 页码章节间隔微调 */
.page-about .section + .section {
  padding-top: 20px;
}

/* 高亮文本与选中色 */
.page-about ::selection {
  background: var(--about-red);
  color: #fff;
}
</main>