.page-about {
  --about-timeline-line: rgba(182, 255, 58, 0.35);
  --about-gold-soft: rgba(245, 196, 107, 0.18);
  --about-orange-soft: rgba(255, 107, 44, 0.14);
  --about-panel-soft: rgba(18, 26, 51, 0.88);
  color: var(--color-text);
  background: var(--color-bg);
}

.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding-top: calc(var(--header-h) + 1.25rem);
  padding-bottom: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-muted);
}

.page-about .breadcrumbs a {
  color: var(--color-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .breadcrumbs a:hover {
  color: var(--color-lime);
}

.page-about .breadcrumbs span[aria-current="page"] {
  color: var(--color-text);
  font-weight: 500;
}

.page-about .story-hero {
  padding: clamp(3rem, 7vw, 6rem) 0 clamp(3.5rem, 8vw, 6.5rem);
  position: relative;
  overflow: hidden;
}

.page-about .story-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(120deg, transparent 0%, transparent 38%, var(--about-gold-soft) 38.2%, transparent 38.6%),
    linear-gradient(210deg, transparent 0%, transparent 68%, var(--about-orange-soft) 68.2%, transparent 68.7%),
    radial-gradient(circle at 80% 20%, rgba(182, 255, 58, 0.06), transparent 40%);
  pointer-events: none;
}

.page-about .story-hero .container {
  position: relative;
  z-index: 1;
}

.page-about .story-hero .chapter-index {
  margin-bottom: 1.5rem;
}

.page-about .story-hero .page-title {
  margin-bottom: 1.4rem;
  font-family: var(--font-heading);
  font-weight: 900;
  font-style: oblique;
  transform: skew(var(--skew));
  font-size: clamp(2rem, 5.4vw, 4rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.page-about .story-hero .page-lead {
  max-width: 46em;
  color: var(--color-muted);
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  line-height: 1.9;
  margin-bottom: 2rem;
}

.page-about .story-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

/* ===== 时间轴 ===== */
.page-about .story-timeline-section {
  padding-block: var(--space-section);
  background:
    linear-gradient(180deg, transparent 0%, rgba(182, 255, 58, 0.02) 30%, rgba(255, 107, 44, 0.03) 100%);
}

.page-about .section-head {
  margin-bottom: clamp(2.5rem, 6vw, 4rem);
}

.page-about .timeline-layout {
  display: grid;
  gap: 2.5rem;
}

.page-about .timeline-track {
  position: relative;
  display: grid;
  gap: 2rem;
  padding-left: 1.25rem;
}

.page-about .timeline-track::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--about-timeline-line);
  border-radius: 2px;
}

.page-about .milestone {
  position: relative;
  display: grid;
  gap: 0.8rem;
}

.page-about .milestone::before {
  content: "";
  position: absolute;
  left: -1.25rem;
  top: 0.45rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-lime);
  box-shadow: 0 0 0 4px rgba(182, 255, 58, 0.14);
  transform: translateX(-50%);
}

.page-about .milestone-year {
  font-family: var(--font-data);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: -0.02em;
}

.page-about .milestone-card {
  padding: 1.25rem 1.4rem;
  border-radius: 0 14px 14px 14px;
  border-left: 3px solid var(--color-accent);
  background: var(--color-panel);
}

.page-about .milestone-card h3 {
  font-size: clamp(1.15rem, 1.6vw, 1.45rem);
  font-weight: 700;
  margin-bottom: 0.6rem;
}

.page-about .milestone-card p {
  color: var(--color-muted);
  font-size: 0.975rem;
  line-height: 1.8;
  margin-bottom: 0.6rem;
}

.page-about .milestone-card p:last-child {
  margin-bottom: 0;
}

.page-about .milestone-note {
  font-size: 0.875rem;
  color: #64708f;
  border-top: 1px dashed rgba(138, 147, 181, 0.3);
  padding-top: 0.6rem;
}

.page-about .timeline-figure {
  margin: 0;
}

.page-about .timeline-figure img,
.page-about .capability-image img,
.page-about .culture-figure img {
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 14px;
  display: block;
}

.page-about .timeline-figure figcaption,
.page-about .capability-image figcaption,
.page-about .culture-figure figcaption {
  margin-top: 0.8rem;
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.7;
  padding-left: 1rem;
  border-left: 2px solid var(--color-gold);
}

/* ===== 数据直连 ===== */
.page-about .capability-section {
  padding-block: var(--space-section);
  background: var(--color-deep);
}

.page-about .capability-grid {
  display: grid;
  gap: 3rem;
}

.page-about .pipeline-steps {
  display: grid;
  gap: 1.25rem;
}

.page-about .pipeline-step {
  padding: 1.4rem 1.5rem;
  border-radius: 14px;
  background: var(--about-panel-soft);
  border: 1px solid rgba(138, 147, 181, 0.18);
  position: relative;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .pipeline-step:hover {
  border-color: var(--color-accent);
  transform: translateX(6px);
}

.page-about .pipeline-num {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 0.9rem;
  color: var(--color-lime);
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}

.page-about .pipeline-step h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.45rem;
}

.page-about .pipeline-step p {
  color: var(--color-muted);
  font-size: 0.95rem;
  line-height: 1.75;
}

.page-about .capability-note {
  margin-top: 1.6rem;
  padding: 1.25rem 1.4rem;
  border-left: 3px solid var(--color-gold);
  background: var(--about-gold-soft);
  color: var(--color-muted);
  font-size: 0.925rem;
  line-height: 1.8;
  border-radius: 0 12px 12px 0;
}

.page-about .capability-visual {
  display: grid;
  gap: 1.8rem;
}

.page-about .topology-wrap {
  background:
    linear-gradient(var(--scanline), var(--scanline)),
    var(--color-panel);
  border-radius: 18px;
  padding: 1.2rem;
  border: 1px solid rgba(182, 255, 58, 0.14);
}

.page-about .topology-svg {
  width: 100%;
  height: auto;
  display: block;
}

.page-about .topo-links line {
  stroke-dasharray: 6 4;
  transition: stroke 0.25s ease;
}

.page-about .topology-wrap:hover .topo-links line {
  stroke: var(--color-lime);
}

.page-about .signal-dots circle {
  transition: r 0.2s ease;
}

.page-about .topology-wrap:hover .signal-dots circle {
  r: 8;
}

.page-about .capability-image {
  margin: 0;
}

.page-about .capability-image img {
  max-height: 460px;
  object-fit: cover;
}

/* ===== 合作生态 ===== */
.page-about .ecosystem-section {
  padding-block: var(--space-section);
}

.page-about .ecosystem-grid {
  gap: 1.5rem;
}

.page-about .eco-card {
  padding: 2rem 1.6rem;
  border-radius: 18px;
  background: var(--color-panel);
  border-top: 3px solid var(--color-accent);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.18);
}

.page-about .eco-card .card-kicker {
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: 0.7rem;
}

.page-about .eco-card .metric-value {
  font-family: var(--font-data);
  font-size: 2.6rem;
  font-weight: 700;
  color: var(--color-lime);
  line-height: 1;
  display: block;
  margin-bottom: 0.7rem;
}

.page-about .eco-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
}

.page-about .eco-card p:last-child {
  color: var(--color-muted);
  font-size: 0.94rem;
  line-height: 1.75;
  margin-bottom: 0;
}

.page-about .ecosystem-extra {
  margin-top: 3rem;
}

.page-about .eco-extra-title {
  font-size: 1.25rem;
  margin-bottom: 1.2rem;
  color: var(--color-text);
}

.page-about .eco-details {
  border-bottom: 1px solid rgba(138, 147, 181, 0.2);
  padding-block: 0.4rem;
}

.page-about .eco-details summary {
  cursor: pointer;
  padding: 1rem 0.5rem;
  font-weight: 600;
  font-size: 1.02rem;
  color: var(--color-text);
  list-style: none;
  position: relative;
  padding-right: 2rem;
  transition: color 0.2s ease;
}

.page-about .eco-details summary::-webkit-details-marker {
  display: none;
}

.page-about .eco-details summary::after {
  content: "+";
  position: absolute;
  right: 0.5rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-data);
  font-size: 1.4rem;
  color: var(--color-accent);
  transition: transform 0.2s ease;
}

.page-about .eco-details[open] summary {
  color: var(--color-lime);
}

.page-about .eco-details[open] summary::after {
  content: "−";
  transform: translateY(-50%);
}

.page-about .eco-details p {
  padding: 0 0.5rem 1.2rem;
  margin: 0;
  color: var(--color-muted);
  line-height: 1.75;
  font-size: 0.95rem;
}

.page-about .eco-callout {
  margin-top: 2.5rem;
  padding: 1.4rem 1.6rem;
  border-radius: 12px;
  background: linear-gradient(100deg, rgba(255, 107, 44, 0.16), rgba(182, 255, 58, 0.08));
  border-left: 4px solid var(--color-accent);
  font-size: 1rem;
  line-height: 1.8;
}

.page-about .eco-callout a {
  color: var(--color-lime);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-about .eco-callout a:hover {
  color: var(--color-text);
}

/* ===== 文化愿景 ===== */
.page-about .culture-section {
  padding-block: var(--space-section);
  background:
    repeating-linear-gradient(45deg, rgba(182, 255, 58, 0.025) 0px, rgba(182, 255, 58, 0.025) 1px, transparent 1px, transparent 12px),
    linear-gradient(180deg, var(--color-deep), var(--color-bg));
  position: relative;
  overflow: hidden;
}

.page-about .culture-section::before {
  content: "";
  position: absolute;
  width: 360px;
  height: 360px;
  right: -80px;
  top: -80px;
  background: radial-gradient(circle, var(--about-gold-soft), transparent 70%);
  pointer-events: none;
}

.page-about .culture-layout {
  display: grid;
  gap: 3rem;
}

.page-about .culture-figure {
  margin: 0;
}

.page-about .culture-figure img {
  aspect-ratio: 1/1;
  object-fit: cover;
}

.page-about .culture-copy {
  display: grid;
  gap: 1.6rem;
  align-content: start;
}

.page-about .culture-text h3 {
  font-size: clamp(1.2rem, 1.8vw, 1.6rem);
  font-weight: 700;
  margin-bottom: 0.6rem;
  padding-left: 0.9rem;
  border-left: 4px solid var(--color-gold);
}

.page-about .culture-text p {
  color: var(--color-muted);
  font-size: 1rem;
  line-height: 1.9;
}

.page-about .culture-vision {
  padding: 1.5rem 1.6rem;
  border-radius: 16px;
  background: var(--color-panel);
  border: 1px solid rgba(245, 196, 107, 0.22);
}

.page-about .culture-vision .card-kicker {
  color: var(--color-gold);
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  margin-bottom: 0.5rem;
}

.page-about .culture-vision p:last-child {
  font-size: 1.05rem;
  line-height: 1.85;
  margin-bottom: 0;
}

.page-about .culture-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0.65rem 1.5rem;
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  transform: skew(var(--skew));
  transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .btn span {
  display: inline-block;
  transform: skew(calc(-1 * var(--skew)));
}

.page-about .btn-accent {
  background: var(--color-accent);
  color: var(--color-deep);
  box-shadow: 0 8px 24px rgba(255, 107, 44, 0.26);
}

.page-about .btn-accent:hover {
  background: #ff8150;
  box-shadow: 0 10px 30px rgba(255, 107, 44, 0.35);
}

.page-about .btn-outline {
  border: 1px solid var(--color-gold);
  color: var(--color-gold);
  background: transparent;
}

.page-about .btn-outline:hover {
  background: var(--about-gold-soft);
  color: var(--color-text);
}

/* ===== 响应式 ===== */
@media (max-width: 480px) {
  .page-about .story-hero .page-title {
    transform: none;
    font-style: normal;
  }

  .page-about .timeline-track {
    padding-left: 1rem;
  }

  .page-about .milestone::before {
    left: -1rem;
  }

  .page-about .milestone-year {
    font-size: 1.3rem;
  }

  .page-about .pipeline-step {
    padding: 1.1rem 1.1rem;
  }

  .page-about .eco-card {
    padding: 1.5rem 1.2rem;
  }

  .page-about .culture-actions {
    flex-direction: column;
  }

  .page-about .btn {
    width: 100%;
  }
}

@media (min-width: 640px) {
  .page-about .timeline-layout {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: start;
  }

  .page-about .timeline-track {
    padding-right: 1rem;
  }

  .page-about .capability-grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .page-about .culture-layout {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: center;
  }

  .page-about .ecosystem-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .page-about .story-hero {
    padding: clamp(5rem, 9vw, 8rem) 0;
  }

  .page-about .story-hero .page-title {
    max-width: 13em;
  }

  .page-about .timeline-layout {
    padding-left: 2rem;
  }

  .page-about .milestone {
    grid-template-columns: 140px 1fr;
    gap: 1.5rem;
    align-items: baseline;
  }

  .page-about .milestone::before {
    left: -1.6rem;
  }

  .page-about .milestone-year {
    text-align: right;
    font-size: 1.8rem;
  }

  .page-about .pipeline-steps {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .culture-layout {
    grid-template-columns: 0.8fr 1.2fr;
    padding-left: 3rem;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .page-about .milestone-card,
  .page-about .pipeline-step,
  .page-about .eco-card,
  .page-about .culture-vision {
    animation: about-rise-in 0.6s var(--ease-cubic) both;
  }

  .page-about .milestone:nth-child(2) .milestone-card { animation-delay: 0.08s; }
  .page-about .milestone:nth-child(3) .milestone-card { animation-delay: 0.16s; }
  .page-about .milestone:nth-child(4) .milestone-card { animation-delay: 0.24s; }
  .page-about .milestone:nth-child(5) .milestone-card { animation-delay: 0.32s; }
  .page-about .milestone:nth-child(6) .milestone-card { animation-delay: 0.4s; }

  @keyframes about-rise-in {
    from {
      opacity: 0;
      transform: translateY(18px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}