.page-about {
  --about-red: #CC2936;
  --about-black: #1A1A1A;
  --about-gold: #D4AF37;
  --about-bg-dark: #0D0D0D;
  --about-bg-light: #F5F5F0;
  --about-card-bg: #2A2A2A;
  --about-text-muted: #999999;
  --about-font-headings: 'Bebas Neue', Impact, 'Arial Black', sans-serif;
  --about-font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  --about-font-data: 'JetBrains Mono', 'Courier New', monospace;
  --about-gap: 2rem;
  --about-radius: 12px;
  --about-transition: 0.3s ease;
  display: block;
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  color: var(--about-black);
  font-family: var(--about-font-body);
  line-height: 1.6;
  background: var(--about-bg-light);
  position: relative;
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--about-text-muted);
  margin-bottom: 2.5rem;
  letter-spacing: 0.02em;
}
.page-about .breadcrumb a {
  color: var(--about-red);
  text-decoration: none;
  transition: color var(--about-transition);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--about-gold);
  text-decoration: underline;
}
.page-about .breadcrumb .separator {
  color: var(--about-text-muted);
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--about-black);
  font-weight: 500;
}

/* 通用section标签 */
.page-about .section-label {
  font-family: var(--about-font-headings);
  font-size: 2rem;
  font-weight: 700;
  color: var(--about-black);
  margin: 0 0 1.25rem;
  letter-spacing: 0.02em;
  position: relative;
  display: inline-block;
}
.page-about .section-label::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: var(--about-red);
  margin-top: 0.35rem;
  border-radius: 2px;
}
.page-about .section-label.gold-accent::after {
  background: var(--about-gold);
}
.page-about .container-narrow {
  max-width: 820px;
  margin: 0 auto;
}
.page-about .text-gold {
  color: var(--about-gold);
}

/* --- hero 左右分屏 --- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--about-gap);
  align-items: center;
  margin-bottom: 5rem;
  padding: 2rem 0;
  border-bottom: 2px dashed rgba(204, 41, 54, 0.15);
}
.page-about .hero-left {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.page-about .hero-slogan {
  font-family: var(--about-font-headings);
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 900;
  line-height: 1;
  color: var(--about-black);
  background: linear-gradient(135deg, var(--about-red) 0%, var(--about-gold) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin: 0;
  transition: background-position 0.6s ease;
  background-size: 200% 200%;
  background-position: 0% 50%;
}
.page-about .hero-slogan[data-interact="color-shift"]:hover,
.page-about .hero-slogan[data-interact="color-shift"]:focus-visible {
  background-position: 100% 50%;
}
.page-about .hero-sub {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--about-red);
  letter-spacing: 0.06em;
  margin: 0.25rem 0 0;
}
.page-about .hero-desc {
  font-size: 1rem;
  color: var(--about-text-muted);
  max-width: 32em;
  margin: 0;
}
.page-about .hero-right {
  display: flex;
  justify-content: center;
  align-items: center;
}
.page-about .hero-visual-box {
  width: 100%;
  max-width: 440px;
  border-radius: var(--about-radius);
  overflow: hidden;
  box-shadow: 0 12px 40px rgba(204, 41, 54, 0.12);
  transform: rotate(1deg);
  transition: transform var(--about-transition);
}
.page-about .hero-visual-box:hover {
  transform: rotate(0deg) scale(1.01);
}
.page-about .hero-visual-box img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

/* --- 我们的理念 --- */
.page-about .about-mission {
  margin-bottom: 5rem;
  padding: 0 0.5rem;
}
.page-about .mission-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2.5rem;
  align-items: start;
}
.page-about .mission-text p {
  font-size: 1.05rem;
  margin: 0 0 1rem;
  color: #2c2c2c;
}
.page-about .mission-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--about-card-bg);
  color: #fff;
  padding: 2rem 1.5rem;
  border-radius: var(--about-radius);
  text-align: center;
  box-shadow: 0 6px 20px rgba(0,0,0,0.08);
}
.page-about .stat-number {
  font-size: 4rem;
  line-height: 1;
  margin-bottom: 0.75rem;
  display: inline-block;
  transition: transform var(--about-transition);
}
.page-about .stat-number[data-interact="pulse"]:hover,
.page-about .stat-number[data-interact="pulse"]:focus-visible {
  transform: scale(1.2);
}
.page-about .stat-desc {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0;
  color: #ddd;
}

/* --- 数据即速度 --- */
.page-about .about-speed {
  margin-bottom: 5rem;
  background: var(--about-black);
  color: #fff;
  border-radius: var(--about-radius);
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0,0,0,0.25);
}
.page-about .speed-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  align-items: stretch;
}
.page-about .speed-content {
  padding: 3rem 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.page-about .speed-content .section-label {
  color: var(--about-gold);
}
.page-about .speed-content .section-label::after {
  background: var(--about-gold);
}
.page-about .speed-lead {
  font-size: 1.2rem;
  font-weight: 600;
  color: #e0e0e0;
  margin: 0 0 1.5rem;
}
.page-about .speed-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}
.page-about .speed-list li {
  position: relative;
  padding-left: 1.75rem;
  font-size: 0.98rem;
  color: #ccc;
}
.page-about .speed-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--about-gold);
  font-weight: 700;
}
.page-about .speed-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  background: #1a1a1a;
  padding: 2rem;
  min-height: 300px;
}
.page-about .speed-visual img {
  display: block;
  width: auto;
  height: 100%;
  max-height: 480px;
  max-width: 100%;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(212, 175, 55, 0.2);
}

/* --- 用户声音 时间线 --- */
.page-about .about-voices {
  margin-bottom: 5rem;
  padding: 0 0.5rem;
}
.page-about .voices-timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  padding-left: 2.5rem;
  margin-top: 2rem;
}
.page-about .voices-timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: repeating-linear-gradient(
    to bottom,
    var(--about-red) 0px,
    var(--about-red) 8px,
    transparent 8px,
    transparent 16px
  );
  border-radius: 2px;
}
.page-about .timeline-node {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  cursor: default;
  transition: opacity var(--about-transition);
}
.page-about .timeline-node:hover,
.page-about .timeline-node:focus-within {
  opacity: 1;
}
.page-about .node-marker {
  position: absolute;
  left: -2.5rem;
  top: 0.35rem;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--about-red);
  border: 4px solid var(--about-bg-light);
  box-shadow: 0 0 0 3px var(--about-red), 0 4px 12px rgba(204,41,54,0.3);
  transition: transform var(--about-transition), background var(--about-transition);
  z-index: 2;
}
.page-about .timeline-node:hover .node-marker,
.page-about .timeline-node:focus-within .node-marker {
  transform: scale(1.25);
  background: var(--about-gold);
  box-shadow: 0 0 0 3px var(--about-gold), 0 6px 20px rgba(212,175,55,0.4);
}
.page-about .node-card {
  background: #fff;
  border-radius: var(--about-radius);
  padding: 1.25rem 1.5rem;
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
  border-left: 4px solid var(--about-red);
  transition: transform var(--about-transition), box-shadow var(--about-transition);
  width: 100%;
}
.page-about .timeline-node:hover .node-card,
.page-about .timeline-node:focus-within .node-card {
  transform: translateX(6px);
  box-shadow: 0 8px 28px rgba(204,41,54,0.10);
}
.page-about .node-scene {
  font-weight: 700;
  font-size: 1.05rem;
  margin: 0 0 0.35rem;
  color: var(--about-black);
}
.page-about .node-answer {
  margin: 0;
  color: #555;
  font-size: 0.95rem;
}
.page-about .timeline-node[data-hover-text]::after {
  content: attr(data-hover-text);
  position: absolute;
  left: 3.5rem;
  top: -0.75rem;
  background: var(--about-black);
  color: var(--about-gold);
  font-size: 0.8rem;
  padding: 0.35rem 0.85rem;
  border-radius: 6px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--about-transition);
  z-index: 10;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  font-weight: 500;
}
.page-about .timeline-node:hover::after,
.page-about .timeline-node:focus-within::after {
  opacity: 1;
}

/* --- 团队承诺 --- */
.page-about .about-commit {
  margin-bottom: 2rem;
  background: var(--about-bg-dark);
  border-radius: var(--about-radius);
  overflow: hidden;
  box-shadow: 0 8px 30px rgba(0,0,0,0.15);
}
.page-about .commit-layout {
  display: grid;
  grid-template-columns: 1fr 1.8fr;
  gap: 0;
  align-items: center;
  color: #fff;
}
.page-about .commit-symbol {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2.5rem 2rem;
  background: #141414;
  min-height: 260px;
}
.page-about .commit-symbol img {
  display: block;
  width: 100%;
  max-width: 220px;
  height: auto;
  object-fit: contain;
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.25);
  transition: transform var(--about-transition);
}
.page-about .commit-symbol img:hover {
  transform: rotate(-6deg) scale(1.03);
}
.page-about .commit-content {
  padding: 2.5rem 2.5rem 2.5rem 2rem;
}
.page-about .commit-content .section-label {
  color: var(--about-gold);
}
.page-about .commit-content .section-label::after {
  background: var(--about-gold);
}
.page-about .commit-text {
  font-size: 1rem;
  color: #ccc;
  margin: 0 0 0.85rem;
  max-width: 36em;
}
.page-about .commit-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1.25rem 0 1.75rem;
}
.page-about .contact-chip {
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(212, 175, 55, 0.2);
  border-radius: 30px;
  padding: 0.4rem 1.1rem;
  font-size: 0.88rem;
  color: #eee;
  letter-spacing: 0.01em;
  transition: background var(--about-transition), border-color var(--about-transition);
}
.page-about .contact-chip:hover {
  background: rgba(212, 175, 55, 0.12);
  border-color: var(--about-gold);
}
.page-about .btn-gold {
  display: inline-block;
  background: var(--about-gold);
  color: var(--about-black);
  font-family: var(--about-font-headings);
  font-size: 1.1rem;
  font-weight: 700;
  padding: 0.7rem 2rem;
  border-radius: 40px;
  text-decoration: none;
  letter-spacing: 0.06em;
  transition: background var(--about-transition), transform var(--about-transition), box-shadow var(--about-transition);
  box-shadow: 0 4px 14px rgba(212, 175, 55, 0.3);
}
.page-about .btn-gold:hover,
.page-about .btn-gold:focus-visible {
  background: #e6c24b;
  transform: translateY(-3px);
  box-shadow: 0 8px 28px rgba(212, 175, 55, 0.35);
  outline: none;
}

/* ========== 移动端优先 适配窄屏 ========== */
@media (max-width: 820px) {
  .page-about {
    padding: 1.5rem 1rem 3rem;
  }
  .page-about .about-hero {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-bottom: 3rem;
    padding: 1.5rem 0;
  }
  .page-about .hero-slogan {
    font-size: clamp(2.4rem, 10vw, 3.6rem);
  }
  .page-about .hero-visual-box {
    max-width: 100%;
    transform: none;
  }
  .page-about .hero-visual-box:hover {
    transform: none;
  }
  .page-about .mission-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .page-about .mission-stat {
    padding: 1.5rem 1rem;
  }
  .page-about .speed-inner {
    grid-template-columns: 1fr;
  }
  .page-about .speed-content {
    padding: 2rem 1.5rem;
  }
  .page-about .speed-visual {
    padding: 1.5rem;
    min-height: 200px;
  }
  .page-about .speed-visual img {
    max-height: 300px;
  }
  .page-about .voices-timeline {
    padding-left: 1.8rem;
    gap: 1.75rem;
  }
  .page-about .voices-timeline::before {
    left: 8px;
  }
  .page-about .node-marker {
    left: -1.8rem;
    width: 22px;
    height: 22px;
  }
  .page-about .timeline-node[data-hover-text]::after {
    left: 1rem;
    top: -0.5rem;
    white-space: normal;
    max-width: 260px;
    font-size: 0.75rem;
  }
  .page-about .commit-layout {
    grid-template-columns: 1fr;
  }
  .page-about .commit-symbol {
    min-height: 180px;
    padding: 1.5rem;
  }
  .page-about .commit-content {
    padding: 1.5rem 1.25rem 2rem;
  }
  .page-about .commit-contact {
    flex-direction: column;
    align-items: flex-start;
  }
  .page-about .contact-chip {
    width: auto;
  }
  .page-about .section-label {
    font-size: 1.6rem;
  }
}

@media (max-width: 480px) {
  .page-about {
    padding: 1rem 0.75rem 2.5rem;
  }
  .page-about .hero-slogan {
    font-size: clamp(2rem, 12vw, 2.8rem);
  }
  .page-about .hero-sub {
    font-size: 1rem;
  }
  .page-about .speed-content {
    padding: 1.5rem 1rem;
  }
  .page-about .speed-list li {
    font-size: 0.92rem;
  }
  .page-about .node-card {
    padding: 1rem 1.25rem;
  }
  .page-about .node-scene {
    font-size: 0.95rem;
  }
  .page-about .node-answer {
    font-size: 0.88rem;
  }
  .page-about .btn-gold {
    font-size: 1rem;
    padding: 0.6rem 1.6rem;
  }
}