.page-about {
  --page-radius-xl: 32px;
  --page-shadow: 0 12px 32px rgba(10, 20, 40, 0.18);
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
}
.page-about img {
  max-width: 100%;
  height: auto;
}
.page-about .content-wrap {
  padding-top: 0;
  padding-bottom: 0;
}

/* ========= 面包屑 ========= */
.page-about .about-breadcrumb {
  padding: 28px 0 16px;
}
.page-about .about-breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.875rem;
  font-family: var(--font-body);
}
.page-about .about-breadcrumb a {
  color: rgba(244, 239, 230, 0.72);
  text-decoration: none;
  transition: color 0.2s ease;
}
.page-about .about-breadcrumb a:hover,
.page-about .about-breadcrumb a:focus-visible {
  color: var(--gold);
  outline: none;
}
.page-about .about-breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(244, 239, 230, 0.4);
}
.page-about .about-breadcrumb span[aria-current="page"] {
  color: var(--paper);
}

/* ========= Hero ========= */
.page-about .about-hero {
  background: var(--space-900);
  color: var(--paper);
  padding-bottom: 56px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 36px), 0 100%);
}
.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
  padding-top: 12px;
}
.page-about .about-hero-tagline {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--gold);
  font-family: var(--font-data);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin: 0;
}
.page-about .about-hero-tagline::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--signal-orange);
  border-radius: 2px;
}
.page-about .about-hero h1 {
  font-family: var(--font-headline);
  font-size: clamp(2.1rem, 7vw, 3.6rem);
  line-height: 1.18;
  margin: 18px 0 16px;
  letter-spacing: 0.01em;
}
.page-about .about-hero-lead {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: rgba(244, 239, 230, 0.86);
  max-width: 540px;
  margin: 0;
}
.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 28px;
  align-items: center;
}
.page-about .about-hero-link {
  color: var(--gold);
  font-weight: 600;
  text-decoration: none;
  padding: 8px 4px;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.page-about .about-hero-link:hover,
.page-about .about-hero-link:focus-visible {
  border-bottom-color: var(--gold);
  transform: translateX(2px);
  outline: none;
}
.page-about .about-hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  font-size: 0.875rem;
  color: rgba(244, 239, 230, 0.6);
}
.page-about .about-hero-facts li {
  display: flex;
  align-items: center;
  gap: 8px;
}
.page-about .about-hero-facts li::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  flex: 0 0 auto;
}
.page-about .about-hero-figure {
  margin: 0;
  position: relative;
}
.page-about .about-hero-figure::before {
  content: "";
  position: absolute;
  inset: 12px -12px -12px 12px;
  border: 2px solid rgba(229, 182, 62, 0.5);
  border-radius: var(--radius-lg);
  z-index: 1;
  pointer-events: none;
}
.page-about .about-hero-figure img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--page-shadow);
  position: relative;
  z-index: 2;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

/* ========= 章节通用布局 ========= */
.page-about .about-section-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  padding: 64px 0;
  align-items: start;
}
.page-about .about-section-layout-dark {
  color: var(--paper);
}
.page-about .about-chapter-no {
  font-family: var(--font-data);
  font-size: 2.6rem;
  color: var(--signal-orange);
  line-height: 1;
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}
.page-about .about-chapter-no::after {
  content: "";
  width: 40px;
  height: 3px;
  background: var(--signal-orange);
  border-radius: 3px;
}
.page-about .about-chapter-no-dark {
  color: var(--gold);
}
.page-about .about-chapter-no-dark::after {
  background: var(--gold);
}
.page-about .about-section-main {
  min-width: 0;
}
.page-about .section-lead {
  margin: 8px 0 28px;
  max-width: 620px;
  line-height: 1.7;
}

/* ========= 门从哪里来 ========= */
.page-about .about-origin {
  background: var(--paper);
}
.page-about .about-origin-content {
  display: grid;
  gap: 18px;
}
.page-about .about-origin-intro {
  font-size: 1.375rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
  margin: 0;
}
.page-about .about-origin-content p {
  line-height: 1.8;
  margin: 0;
  max-width: 640px;
}
.page-about .about-origin-content strong {
  color: var(--signal-orange);
}
.page-about .about-quote {
  margin: 12px 0 0;
  padding: 24px 28px;
  background: var(--paper-dim);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--gold);
  font-family: var(--font-headline);
  font-size: 1.25rem;
  line-height: 1.5;
  max-width: 640px;
}
.page-about .about-quote p {
  margin: 0;
}
.page-about .about-text-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--signal-orange);
  font-weight: 700;
  text-decoration: none;
  width: fit-content;
  padding: 8px 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.page-about .about-text-link:hover,
.page-about .about-text-link:focus-visible {
  border-bottom-color: var(--signal-orange);
  transform: translateX(2px);
  outline: none;
}

/* ========= 关键数字 ========= */
.page-about .about-numbers {
  background: var(--space-900);
  color: var(--paper);
}
.page-about .about-numbers .content-wrap {
  padding-bottom: 56px;
}
.page-about .about-numbers-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 24px;
}
.page-about .about-number-card {
  background: var(--panel);
  border-radius: var(--radius-lg);
  padding: 22px 18px;
  border-top: 3px solid var(--signal-orange);
  position: relative;
  min-height: 150px;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.page-about .about-number-card:hover,
.page-about .about-number-card:focus-within {
  transform: translateY(-4px);
  box-shadow: 0 10px 24px rgba(10, 20, 40, 0.35);
}
.page-about .about-number-card::after {
  content: "";
  position: absolute;
  right: 14px;
  top: 14px;
  width: 10px;
  height: 10px;
  border: 2px solid var(--gold);
  border-radius: 50%;
  opacity: 0.8;
}
.page-about .about-number-value {
  font-family: var(--font-headline);
  font-size: clamp(1.9rem, 5vw, 2.8rem);
  color: var(--gold);
  margin: 0 0 6px;
  line-height: 1.1;
}
.page-about .about-number-label {
  font-weight: 700;
  margin: 0 0 8px;
  font-size: 1rem;
}
.page-about .about-number-note {
  font-size: 0.8125rem;
  color: rgba(244, 239, 230, 0.62);
  margin: 0;
  line-height: 1.55;
}

/* ========= 发展里程碑 ========= */
.page-about .about-milestones {
  background: var(--paper);
}
.page-about .about-milestones .content-wrap {
  padding-bottom: 56px;
}
.page-about .about-timeline-wrap {
  margin-top: 20px;
  overflow: hidden;
  border-radius: var(--radius-lg);
}
.page-about .about-timeline-track {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 16px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--signal-orange) var(--paper-dim);
}
.page-about .about-timeline-track::-webkit-scrollbar {
  height: 6px;
}
.page-about .about-timeline-track::-webkit-scrollbar-track {
  background: var(--paper-dim);
  border-radius: 8px;
}
.page-about .about-timeline-track::-webkit-scrollbar-thumb {
  background: var(--signal-orange);
  border-radius: 8px;
}
.page-about .about-milestone-card {
  flex: 0 0 280px;
  scroll-snap-align: start;
  background: var(--paper-dim);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  border: 1px solid transparent;
  min-height: 280px;
  position: relative;
  transition: background 0.2s ease, transform 0.2s ease;
}
.page-about .about-milestone-card:hover,
.page-about .about-milestone-card:focus-within {
  background: var(--paper);
  transform: translateY(-4px);
}
.page-about .about-milestone-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 28px;
  right: 28px;
  height: 4px;
  background: var(--gold);
  border-radius: 0 0 4px 4px;
}
.page-about .about-milestone-year {
  font-family: var(--font-data);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--signal-orange);
  margin: 0 0 12px;
  line-height: 1;
}
.page-about .about-milestone-card h3 {
  font-family: var(--font-headline);
  font-size: 1.25rem;
  margin: 0 0 12px;
  color: var(--ink);
}
.page-about .about-milestone-card p {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--ink);
  margin: 0;
}
.page-about .about-milestone-figure {
  margin: 24px 0 0;
}
.page-about .about-milestone-figure img {
  width: 100%;
  border-radius: var(--radius-lg);
  object-fit: cover;
  aspect-ratio: 4 / 3;
  box-shadow: var(--page-shadow);
}

/* ========= 技术能力 ========= */
.page-about .about-tech {
  background: var(--panel);
  color: var(--paper);
}
.page-about .about-tech .content-wrap {
  padding-bottom: 56px;
}
.page-about .about-tech-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 24px;
}
.page-about .about-tech-card {
  background: var(--space-900);
  border-radius: var(--radius-md);
  padding: 26px 24px;
  border-left: 4px solid var(--cyan);
  transition: transform 0.2s ease;
}
.page-about .about-tech-card:hover {
  transform: translateX(4px);
}
.page-about .about-tech-card-index {
  font-family: var(--font-data);
  font-size: 0.8125rem;
  color: var(--cyan);
  margin: 0 0 10px;
  letter-spacing: 0.08em;
}
.page-about .about-tech-card h3 {
  font-family: var(--font-headline);
  font-size: 1.125rem;
  margin: 0 0 10px;
  color: var(--paper);
}
.page-about .about-tech-card p {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: rgba(244, 239, 230, 0.7);
  margin: 0;
}
.page-about .about-tech-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--gold);
  font-weight: 700;
  text-decoration: none;
  margin-top: 28px;
  padding: 8px 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.page-about .about-tech-link:hover,
.page-about .about-tech-link:focus-visible {
  border-bottom-color: var(--gold);
  transform: translateX(2px);
  outline: none;
}

/* ========= 合作生态 ========= */
.page-about .about-ecosystem {
  background: var(--paper);
}
.page-about .about-ecosystem .content-wrap {
  padding-bottom: 64px;
}
.page-about .about-eco-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 24px;
}
.page-about .about-eco-card {
  background: var(--paper);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  border: 1px solid var(--paper-dim);
  border-left: 4px solid var(--signal-orange);
  box-shadow: 0 4px 12px rgba(28, 45, 58, 0.04);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.page-about .about-eco-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(28, 45, 58, 0.08);
}
.page-about .about-eco-card h3 {
  font-family: var(--font-headline);
  font-size: 1.0625rem;
  margin: 0 0 10px;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 8px;
}
.page-about .about-eco-card h3::before {
  content: "●";
  color: var(--signal-orange);
  font-size: 0.75rem;
}
.page-about .about-eco-card p {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--ink);
  margin: 0;
}

/* ========= 社区与评级 ========= */
.page-about .about-community {
  background: var(--space-900);
  color: var(--paper);
}
.page-about .about-community .content-wrap {
  padding-bottom: 80px;
}
.page-about .about-community-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 24px;
  align-items: center;
}
.page-about .about-community-copy > p {
  line-height: 1.8;
  color: rgba(244, 239, 230, 0.82);
  max-width: 560px;
}
.page-about .about-community-list {
  list-style: none;
  margin: 24px 0 28px;
  padding: 0;
}
.page-about .about-community-list li {
  padding: 14px 0;
  border-bottom: 1px solid rgba(244, 239, 230, 0.14);
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 10px;
}
.page-about .about-community-list li:last-child {
  border-bottom: none;
}
.page-about .about-community-list li::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gold);
  flex: 0 0 auto;
}
.page-about .about-community-list strong {
  color: var(--gold);
  font-family: var(--font-data);
  font-size: 1.125rem;
}
.page-about .about-community-figure {
  margin: 0;
}
.page-about .about-community-figure img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--page-shadow);
  object-fit: cover;
  aspect-ratio: 10 / 7;
}

/* ========= 桌面端：768px+ ========= */
@media (min-width: 768px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 48px;
  }
  .page-about .about-section-layout {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 44px;
    padding: 96px 0;
  }
  .page-about .about-chapter-no {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-size: 4rem;
    height: 100%;
    justify-content: flex-start;
  }
  .page-about .about-chapter-no::after {
    width: 3px;
    height: 48px;
    margin-top: 14px;
  }
  .page-about .about-numbers-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }
  .page-about .about-timeline-track {
    gap: 20px;
  }
  .page-about .about-milestone-card {
    flex-basis: 320px;
  }
  .page-about .about-tech-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
  }
  .page-about .about-eco-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
  }
  .page-about .about-community-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 48px;
  }
}

/* ========= 大屏：1024px+ ========= */
@media (min-width: 1024px) {
  .page-about .about-hero h1 {
    font-size: clamp(3rem, 6vw, 4.6rem);
  }
  .page-about .about-hero-lead {
    font-size: 1.125rem;
  }
  .page-about .about-section-layout {
    gap: 64px;
  }
  .page-about .about-section-layout {
    padding: 120px 0;
  }
  .page-about .about-origin-content {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
  .page-about .about-quote {
    grid-column: 1 / -1;
  }
  .page-about .about-text-link {
    grid-column: 1 / -1;
  }
  .page-about .about-number-card {
    padding: 30px 24px;
    min-height: 180px;
  }
  .page-about .about-number-value {
    font-size: clamp(2.2rem, 4vw, 3.2rem);
  }
  .page-about .about-eco-card {
    padding: 32px 28px;
  }
}