.page-about {
  --story-line: #CBD5E1;
}

/* 页面头部 */
.page-about .page-about-hero {
  position: relative;
  padding-block: var(--space-2xl) var(--space-2xl);
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
  background:
    radial-gradient(160px 160px at 12% 10%, rgba(10, 102, 255, 0.07), transparent 70%),
    linear-gradient(180deg, #FFFFFF 0%, var(--color-bg) 100%);
}

.page-about .page-about-hero::before {
  content: "";
  position: absolute;
  right: -120px;
  top: -120px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 107, 44, 0.08), transparent 70%);
  pointer-events: none;
}

.page-about .page-about-hero .breadcrumb {
  margin-bottom: var(--space-2xl);
}

.page-about .page-about-hero-grid {
  display: grid;
  gap: var(--space-xl);
  align-items: center;
}

.page-about .page-about-hero-main .eyebrow {
  margin-bottom: var(--space-md);
}

.page-about .page-about-hero-main h1 {
  font-size: clamp(32px, 8vw, 56px);
  max-width: 14em;
  margin: 0 0 var(--space-lg);
}

.page-about .page-about-hero-main .lead {
  max-width: 38em;
  margin: 0 0 var(--space-xl);
  color: var(--color-text-secondary);
  font-size: var(--text-md);
}

.page-about .page-about-hero-main .status-bar {
  max-width: 540px;
  margin-top: var(--space-xl);
}

.page-about .page-about-hero-mark {
  display: none;
}

/* 章节公共 */
.page-about .page-about-chapter {
  padding-block: var(--space-2xl);
  border-bottom: 1px solid var(--color-border);
}

.page-about .page-about-chapter-grid {
  display: grid;
  gap: var(--space-xl);
}

.page-about .page-about-chapter-side {
  display: grid;
  gap: var(--space-sm);
  align-content: start;
}

.page-about .page-about-chapter-heading {
  display: flex;
  align-items: baseline;
  gap: var(--space-md);
}

.page-about .page-about-chapter-num {
  font-size: var(--text-2xl);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--color-primary);
}

.page-about .page-about-chapter-title {
  margin: 0;
  font-size: var(--text-lg);
  letter-spacing: -0.02em;
}

.page-about .page-about-chapter-meta {
  margin: 0;
  padding-top: var(--space-md);
  border-top: 3px solid var(--color-primary);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.page-about .page-about-chapter-content {
  min-width: 0;
}

.page-about .page-about-chapter-lead {
  max-width: 52em;
  margin: 0 0 var(--space-xl);
  font-size: var(--text-md);
  color: var(--color-text-secondary);
}

/* 章节色彩节奏 */
.page-about .page-about-growth {
  background: radial-gradient(300px 200px at 90% 8%, rgba(109, 40, 217, 0.06), transparent 70%);
}

.page-about .page-about-growth .page-about-chapter-meta {
  border-color: var(--color-jewel-purple);
}

.page-about .page-about-growth .page-about-chapter-num {
  color: var(--color-jewel-purple);
}

.page-about .page-about-philosophy {
  background: radial-gradient(260px 260px at 6% 88%, rgba(15, 118, 110, 0.05), transparent 70%);
}

.page-about .page-about-philosophy .page-about-chapter-meta {
  border-color: var(--color-jewel-teal);
}

.page-about .page-about-philosophy .page-about-chapter-num {
  color: var(--color-jewel-teal);
}

.page-about .page-about-local {
  background: radial-gradient(300px 220px at 92% 88%, rgba(123, 29, 59, 0.05), transparent 70%);
}

.page-about .page-about-local .page-about-chapter-meta {
  border-color: var(--color-jewel-wine);
}

.page-about .page-about-local .page-about-chapter-num {
  color: var(--color-jewel-wine);
}

.page-about .page-about-future .page-about-chapter-meta {
  border-color: var(--color-accent);
}

.page-about .page-about-future .page-about-chapter-num {
  color: var(--color-accent);
}

/* 时间轴 */
.page-about .page-about-timeline {
  list-style: none;
  margin: 0 0 var(--space-xl);
  padding: 0;
}

.page-about .page-about-milestone {
  position: relative;
  padding: 0 0 var(--space-xl) var(--space-xl);
  border-left: 2px solid var(--story-line);
}

.page-about .page-about-milestone:last-child {
  padding-bottom: 0;
}

.page-about .page-about-milestone::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 2px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-surface);
  border: 3px solid var(--color-primary);
  box-sizing: border-box;
  transition: background-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .page-about-milestone:hover::before {
  background: var(--color-primary);
  transform: scale(1.25);
}

.page-about .page-about-milestone-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
}

.page-about .page-about-milestone-year {
  font-size: var(--text-md);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-primary-dark);
}

.page-about .page-about-milestone-tag {
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: rgba(109, 40, 217, 0.08);
  color: var(--color-jewel-purple);
  font-size: var(--text-xs);
  font-weight: 600;
}

.page-about .page-about-milestone p {
  max-width: 48em;
  margin: 0;
  color: var(--color-text-secondary);
}

/* 图片与图文容器 */
.page-about .media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .page-about-figure {
  margin: var(--space-xl) 0 0;
}

.page-about .page-about-figure figcaption {
  margin-top: var(--space-sm);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-text-secondary);
}

.page-about .page-about-figure-growth {
  max-width: 480px;
}

.page-about .page-about-figure-collab {
  max-width: 360px;
}

/* 理念原则 */
.page-about .page-about-principles {
  display: grid;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.page-about .page-about-principle {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-md);
  align-items: start;
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .page-about-principle:hover {
  border-color: var(--color-jewel-teal);
  box-shadow: var(--shadow-md);
}

.page-about .page-about-principle-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 28px;
  padding-inline: 8px;
  border-radius: var(--radius-sm);
  background: rgba(15, 118, 110, 0.08);
  color: var(--color-jewel-teal);
  font-size: var(--text-xs);
  font-weight: 700;
  line-height: 1;
}

.page-about .page-about-principle h3 {
  margin: 2px 0 var(--space-xs);
  font-size: var(--text-base);
  letter-spacing: -0.01em;
}

.page-about .page-about-principle p {
  margin: 0;
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
}

/* 本地章节 */
.page-about .page-about-local-grid {
  display: grid;
  gap: var(--space-xl);
}

.page-about .page-about-local-list {
  list-style: none;
  margin: var(--space-lg) 0 0;
  padding: 0;
}

.page-about .page-about-local-list li {
  position: relative;
  padding-left: var(--space-lg);
  color: var(--color-text);
}

.page-about .page-about-local-list li + li {
  margin-top: var(--space-md);
}

.page-about .page-about-local-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--color-jewel-wine);
}

/* 底部跳转区 */
.page-about .page-about-entry {
  padding-block: var(--space-3xl);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.page-about .page-about-entry h2 {
  margin: 0 0 var(--space-md);
  font-size: var(--text-lg);
  text-align: center;
}

.page-about .page-about-entry-lead {
  margin: 0 0 var(--space-xl);
  color: var(--color-text-secondary);
  text-align: center;
}

.page-about .page-about-entry-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md);
}

@media (min-width: 760px) {
  .page-about .page-about-local-grid {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 0.85fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .page-about-hero {
    padding-block: var(--space-3xl) var(--space-3xl);
  }

  .page-about .page-about-hero-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: var(--space-3xl);
  }

  .page-about .page-about-hero-mark {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    justify-content: center;
    padding-right: var(--space-xl);
    border-right: 4px solid var(--color-accent);
    min-height: 220px;
  }

  .page-about .page-about-hero-mark span {
    font-size: clamp(96px, 12vw, 160px);
    font-weight: 700;
    line-height: 0.9;
    letter-spacing: -0.05em;
    color: var(--color-primary);
    opacity: 0.18;
    user-select: none;
  }

  .page-about .page-about-hero-mark small {
    margin-top: var(--space-sm);
    font-size: var(--text-sm);
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--color-text-secondary);
  }

  .page-about .page-about-chapter {
    padding-block: var(--space-3xl);
  }

  .page-about .page-about-chapter-grid {
    grid-template-columns: minmax(240px, 1fr) minmax(0, 2.2fr);
    gap: var(--space-3xl);
    align-items: start;
  }

  .page-about .page-about-chapter-side {
    position: sticky;
    top: calc(var(--header-safe) + var(--space-lg));
    gap: var(--space-lg);
  }

  .page-about .page-about-chapter-heading {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-xs);
  }

  .page-about .page-about-chapter-num {
    font-size: clamp(80px, 9vw, 128px);
  }

  .page-about .page-about-chapter-title {
    font-size: var(--text-xl);
  }

  .page-about .page-about-chapter-meta {
    font-size: var(--text-sm);
  }
}