.page-about{
  --about-timeline-width: 300px;
  --about-radius-lg: 28px;
  position: relative;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.7;
  overflow-x: hidden;
}

/* ===== Hero ===== */
.page-about .about-hero{
  position: relative;
  padding: 72px 20px 48px;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 82% 18%, rgba(0,204,255,0.16) 0%, transparent 46%),
    linear-gradient(135deg, rgba(0,255,136,0.06) 0%, transparent 60%),
    var(--bg);
}
.page-about .about-hero::before{
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,204,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,204,255,0.05) 1px, transparent 1px);
  background-size: 36px 36px;
  pointer-events: none;
}
.page-about .about-hero::after{
  content: '';
  position: absolute;
  right: -12%;
  bottom: -12px;
  width: 46%;
  height: 26px;
  background: var(--gradient);
  transform: skewX(-18deg);
  opacity: 0.7;
  pointer-events: none;
}
.page-about .about-hero-inner{
  position: relative;
  max-width: 1280px;
  margin: 0 auto;
}

/* 面包屑 */
.page-about .breadcrumb{
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--text-dim);
  margin-bottom: 36px;
}
.page-about .breadcrumb-link{
  color: var(--blue);
  text-decoration: none;
  transition: color 0.2s ease;
}
.page-about .breadcrumb-link:hover{
  color: var(--accent);
}
.page-about .breadcrumb-sep{
  color: var(--border);
}
.page-about .breadcrumb-current{
  color: var(--text-dim);
}

/* Hero 文本 */
.page-about .about-hero-kicker{
  color: var(--accent);
  font-family: var(--font-display);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  font-size: 0.8rem;
  margin-bottom: 12px;
}
.page-about .about-hero-title{
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.8rem, 5vw, 3rem);
  line-height: 1.18;
  max-width: 14em;
  margin: 0 0 18px;
}
.page-about .about-hero-lead{
  color: var(--text-dim);
  font-size: 1rem;
  max-width: 56ch;
  margin: 0 0 28px;
}
.page-about .about-hero-meta{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .about-hero-meta span{
  display: inline-block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
  font-family: var(--font-display);
  font-size: 0.78rem;
  color: var(--text);
}

/* ===== 分屏容器 ===== */
.page-about .story-split{
  max-width: 1280px;
  margin: 0 auto;
  padding: 56px 20px 80px;
}

/* ===== 左侧时间轴 ===== */
.page-about .story-timeline{
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--about-radius-lg);
  padding: 28px 24px;
  margin-bottom: 56px;
}
.page-about .timeline-title{
  font-family: var(--font-display);
  font-size: 1.2rem;
  letter-spacing: 0.14em;
  margin: 0 0 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.page-about .timeline-title::before{
  content: '';
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: var(--shadow-accent);
}
.page-about .timeline-rail{
  position: relative;
  padding-left: 36px;
}
.page-about .timeline-svg{
  position: absolute;
  left: 8px;
  top: 0;
  width: 40px;
  height: 100%;
  pointer-events: none;
}
.page-about .timeline-list{
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  z-index: 1;
}
.page-about .timeline-node{
  position: relative;
  padding-bottom: 28px;
}
.page-about .timeline-node:last-child{
  padding-bottom: 0;
}
.page-about .timeline-dot{
  position: absolute;
  left: -22px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg);
  box-shadow: var(--shadow-accent);
  z-index: 2;
}
.page-about .timeline-year{
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  color: var(--accent);
  background: rgba(0,255,136,0.08);
  border: 1px solid rgba(0,255,136,0.2);
  border-radius: var(--radius-pill);
  padding: 2px 10px;
  margin-bottom: 6px;
}
.page-about .timeline-node-title{
  font-size: 1rem;
  margin: 0 0 6px;
  color: var(--text);
}
.page-about .timeline-node-text{
  margin: 0;
  color: var(--text-dim);
  font-size: 0.88rem;
  line-height: 1.6;
}
.page-about .timeline-node-detail{
  margin: 6px 0 0;
  color: var(--text-dim);
  font-size: 0.82rem;
  line-height: 1.6;
}
.page-about .timeline-figure{
  margin: 32px 0 0;
  text-align: center;
}
.page-about .timeline-figure img{
  width: 100%;
  max-width: 300px;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  display: block;
}
.page-about .timeline-figcaption{
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-top: 10px;
  letter-spacing: 0.08em;
}

/* ===== 右侧叙事 ===== */
.page-about .story-section{
  margin-bottom: 72px;
  scroll-margin-top: 96px;
}
.page-about .story-section:last-child{
  margin-bottom: 0;
}
.page-about .section-head{
  margin-bottom: 28px;
}
.page-about .section-kicker{
  color: var(--blue);
  font-family: var(--font-display);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  margin-bottom: 8px;
}
.page-about .section-title{
  font-family: var(--font-display);
  font-size: 1.7rem;
  line-height: 1.25;
  margin: 0 0 10px;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.page-about .section-subtitle{
  color: var(--text-dim);
  margin: 0;
  max-width: 60ch;
}

/* 起源 */
.page-about .origin-body{
  display: grid;
  gap: 16px;
}
.page-about .origin-lead{
  font-size: 1.15rem;
  color: var(--text);
  border-left: 4px solid var(--accent);
  padding-left: 16px;
  margin: 0;
}
.page-about .origin-body p{
  margin: 0;
  color: var(--text-dim);
}

/* ===== 版本演进 ===== */
.page-about .version-shell{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--about-radius-lg);
  padding: 24px;
}
.page-about .filter-wrap{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 24px;
}
.page-about .filter-hint{
  color: var(--text-dim);
  font-size: 0.88rem;
  margin: 0;
}
.page-about .filter-bar{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .filter-btn{
  appearance: none;
  border: 1px solid var(--border);
  background: var(--surface-highlight);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}
.page-about .filter-btn:hover{
  border-color: var(--accent);
}
.page-about .filter-btn[aria-pressed="true"]{
  background: var(--gradient);
  color: var(--bg);
  border-color: transparent;
  box-shadow: var(--shadow-accent);
}
.page-about .version-grid{
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}
.page-about .version-card{
  flex: 1 1 320px;
  background: var(--surface-highlight);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.page-about .version-card:hover{
  border-color: rgba(0,255,136,0.4);
  box-shadow: var(--shadow-accent);
}
.page-about .version-name{
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin: 0 0 16px;
}
.page-about .version-figure{
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
  margin: 0 0 16px;
  background: #0d131b;
}
.page-about .version-figure img{
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 4;
  object-fit: cover;
  display: block;
}
.page-about .version-figure::before{
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 4px;
  background: var(--gradient);
  z-index: 2;
}
.page-about .version-figure::after{
  content: attr(data-label);
  position: absolute;
  right: 10px;
  bottom: 10px;
  z-index: 2;
  background: rgba(10,14,20,0.85);
  border: 1px solid var(--border);
  color: var(--blue);
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
}
.page-about .version-list{
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}
.page-about .version-list li{
  position: relative;
  padding-left: 20px;
  font-size: 0.92rem;
  color: var(--text-dim);
  line-height: 1.6;
}
.page-about .version-list li::before{
  content: '';
  position: absolute;
  left: 2px;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 2px;
  background: var(--blue);
}

/* ===== 移动端优先 ===== */
.page-about .mobile-grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.page-about .mobile-feature{
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--about-radius-lg);
  text-decoration: none;
  color: var(--text);
  transition: color 0.2s, border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
.page-about .mobile-feature:hover,
.page-about .mobile-feature:focus-visible{
  border-color: rgba(0,204,255,0.45);
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(0,204,255,0.12);
}
.page-about .mobile-feature-title{
  font-size: 1.05rem;
  margin: 0;
  color: var(--text);
}
.page-about .mobile-feature-text{
  font-size: 0.9rem;
  line-height: 1.65;
  margin: 0;
  color: var(--text-dim);
}
.page-about .mobile-icon{
  width: 56px;
  height: 56px;
  border-radius: 18px;
  background: var(--surface-highlight);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}
.page-about .mobile-feature:active .mobile-icon,
.page-about .mobile-feature:focus-within .mobile-icon{
  transform: scale(1.06);
  border-color: var(--accent);
  box-shadow: 0 0 24px rgba(0,255,136,0.35);
}
.page-about .mobile-icon-menu{
  flex-direction: column;
  gap: 5px;
}
.page-about .mobile-icon-menu i{
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
}
.page-about .mobile-icon-search{
  position: relative;
}
.page-about .mobile-icon-search::before{
  content: '';
  width: 14px;
  height: 14px;
  border: 2px solid var(--blue);
  border-radius: 50%;
}
.page-about .mobile-icon-search::after{
  content: '';
  position: absolute;
  right: 13px;
  bottom: 16px;
  width: 8px;
  height: 2px;
  border-radius: 2px;
  background: var(--blue);
  transform: rotate(45deg);
}
.page-about .mobile-icon-archive{
  position: relative;
}
.page-about .mobile-icon-archive::before{
  content: '';
  width: 22px;
  height: 20px;
  border: 2px solid var(--accent);
  border-radius: 6px;
  position: absolute;
  top: 16px;
  left: 16px;
}
.page-about .mobile-icon-archive::after{
  content: '';
  position: absolute;
  top: 27px;
  left: 22px;
  right: 22px;
  height: 2px;
  background: var(--accent);
  box-shadow: 0 5px 0 var(--accent);
  border-radius: 2px;
}

/* ===== 品牌承诺 ===== */
.page-about .commitment-list{
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 14px;
}
.page-about .commitment-item{
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 22px;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.page-about .commitment-item:hover{
  border-color: rgba(0,255,136,0.35);
  box-shadow: var(--shadow-accent);
}
.page-about .commitment-num{
  font-family: var(--font-display);
  color: var(--accent);
  font-size: 1.4rem;
  font-weight: 800;
  line-height: 1;
  padding-right: 16px;
  border-right: 1px solid var(--border);
}
.page-about .commitment-body{
  flex: 1;
  min-width: 0;
}
.page-about .commitment-title{
  font-size: 1rem;
  margin: 0 0 6px;
  color: var(--text);
}
.page-about .commitment-desc{
  margin: 0;
  color: var(--text-dim);
  font-size: 0.88rem;
  line-height: 1.6;
}

/* ===== 底部内链 ===== */
.page-about .story-next{
  max-width: 1280px;
  margin: 0 auto;
  padding: 56px 20px 88px;
}
.page-about .story-next-inner{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: calc(var(--about-radius-lg) + 12px);
  padding: 36px 28px;
}
.page-about .story-next-grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 24px;
}
.page-about .next-card{
  position: relative;
  display: block;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px 24px 24px;
  text-decoration: none;
  color: var(--text);
  overflow: hidden;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
.page-about .next-card::after{
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: var(--gradient);
  opacity: 0;
  transition: opacity 0.2s;
}
.page-about .next-card:hover,
.page-about .next-card:focus-visible{
  transform: translateY(-4px);
  border-color: rgba(0,255,136,0.4);
  box-shadow: 0 12px 36px rgba(0,255,136,0.1);
}
.page-about .next-card:hover::after{
  opacity: 1;
}
.page-about .next-num{
  font-family: var(--font-display);
  color: var(--blue);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
}
.page-about .next-title{
  font-size: 1.15rem;
  margin: 8px 0 4px;
  color: var(--text);
}
.page-about .next-desc{
  margin: 0;
  color: var(--text-dim);
  font-size: 0.88rem;
  line-height: 1.6;
}

/* ===== 平板断点 ===== */
@media (min-width: 760px){
  .page-about .mobile-grid{
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .commitment-list{
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .commitment-item:last-child{
    grid-column: 1 / -1;
  }
  .page-about .story-next-grid{
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ===== 桌面断点 ===== */
@media (min-width: 1024px){
  .page-about .about-hero{
    padding: 96px 40px 64px;
  }
  .page-about .story-split{
    display: grid;
    grid-template-columns: var(--about-timeline-width) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
    padding: 64px 40px 96px;
  }
  .page-about .story-timeline{
    position: sticky;
    top: 96px;
    margin-bottom: 0;
  }
  .page-about .story-content{
    min-width: 0;
  }
  .page-about .timeline-node-detail{
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, opacity 0.3s ease;
  }
  .page-about .timeline-node:hover .timeline-node-detail,
  .page-about .timeline-node:focus-within .timeline-node-detail{
    max-height: 200px;
    opacity: 1;
  }
  .page-about .story-next{
    padding: 64px 40px 96px;
  }
}