.page-about {
  --about-glow-orange: rgba(255,106,0,.16);
  --about-glow-cyan: rgba(0,168,181,.12);
  --about-section-gap: 64px;
  position: relative;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--body-font);
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(720px 300px at 85% 8%, var(--about-glow-orange), transparent 70%),
    radial-gradient(560px 360px at 10% 32%, var(--about-glow-cyan), transparent 72%);
  pointer-events: none;
}

.page-about > * {
  position: relative;
  z-index: 1;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--heading-font);
}

/* ===== Hero ===== */
.page-about .about-hero {
  padding: 72px 20px 64px;
  max-width: var(--container-w);
  margin-inline: auto;
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 40px;
  letter-spacing: .08em;
}

.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  transition: color var(--transition);
}

.page-about .breadcrumb a:hover {
  color: var(--orange);
}

.page-about .breadcrumb .sep {
  color: var(--border);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
}

.page-about .about-hero-copy {
  max-width: 680px;
}

.page-about .about-hero-kicker {
  display: inline-flex;
  align-items: center;
  margin: 0 0 16px;
  padding: 6px 14px;
  border: 1px solid rgba(255,106,0,.35);
  background: rgba(255,106,0,.08);
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .28em;
  color: var(--orange-bright);
}

.page-about .about-hero h1 {
  margin: 0 0 16px;
  font-size: clamp(42px, 9vw, 84px);
  line-height: .96;
  letter-spacing: .01em;
  color: var(--text);
  text-wrap: balance;
}

.page-about .about-hero .lead {
  margin: 0 0 20px;
  font-size: clamp(18px, 3vw, 28px);
  font-weight: 600;
  color: var(--orange);
}

.page-about .about-hero-desc {
  margin: 0;
  max-width: 560px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

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

.page-about .about-hero-svg {
  width: 100%;
  max-width: 340px;
  height: auto;
}

/* ===== 通用区块 ===== */
.page-about .about-section {
  padding: var(--about-section-gap) 20px;
  border-top: 1px solid var(--border);
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.page-about .about-section-inner {
  max-width: var(--container-w);
  margin-inline: auto;
}

.page-about .about-story-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
}

.page-about .about-story-figure,
.page-about .about-tech-figure {
  position: relative;
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-story-figure::after,
.page-about .about-tech-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255,106,0,.25);
  pointer-events: none;
}

.page-about .about-story-img,
.page-about .about-tech-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.page-about .about-story-img {
  aspect-ratio: 3 / 4;
}

.page-about .about-story-copy h2,
.page-about .about-tech-copy h2 {
  margin: 0 0 20px;
  font-size: clamp(28px, 5vw, 46px);
  line-height: 1.1;
  color: var(--text);
}

.page-about .about-story-copy p,
.page-about .about-tech-copy p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-story-copy p + p {
  margin-top: 14px;
}

.page-about .about-story-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ===== 核心数据 ===== */
.page-about .about-stats-head {
  display: grid;
  gap: 6px;
  margin-bottom: 36px;
}

.page-about .about-stats-head h2 {
  margin: 0;
  font-size: clamp(28px, 5vw, 52px);
  line-height: 1.05;
  color: var(--text);
}

.page-about .about-stats-head p {
  margin: 0;
  font-size: 15px;
  color: var(--muted);
}

.page-about .about-stats-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .about-stat-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow: hidden;
  padding: 34px 28px;
  background: linear-gradient(160deg, var(--panel-2), var(--panel) 74%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.page-about .about-stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--orange), var(--cyan));
  opacity: .4;
}

.page-about .about-stat-card:hover {
  transform: translateY(-8px);
  border-color: rgba(255,106,0,.55);
  box-shadow: var(--shadow-1), 0 16px 40px rgba(255,106,0,.12);
}

.page-about .about-stat-card--accent {
  background: linear-gradient(155deg, rgba(255,106,0,.18), var(--panel) 62%);
  border-color: rgba(255,106,0,.5);
}

.page-about .about-stat-value {
  font-family: var(--data-font);
  font-size: 54px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .about-stat-card--accent .about-stat-value {
  color: var(--orange-bright);
}

.page-about .about-stat-label {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-stat-note {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-stats-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.page-about .about-strip-item {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  background: var(--glass);
  font-size: 13px;
  color: var(--muted);
  white-space: nowrap;
}

.page-about .about-strip-item::before {
  content: "";
  width: 6px;
  height: 6px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--orange-bright);
}

/* ===== 技术架构 ===== */
.page-about .about-tech {
  background: linear-gradient(180deg, rgba(255,106,0,.06), transparent 60%);
}

.page-about .about-tech-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}

.page-about .tech-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 10px;
  margin-top: 28px;
}

.page-about .tech-flow-step {
  flex: 1 1 100%;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 20px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition), transform var(--transition);
}

.page-about .tech-flow-step:hover {
  transform: translateY(-2px);
  border-color: rgba(0,168,181,.6);
}

.page-about .tech-step-num {
  font-family: var(--data-font);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .tech-flow-step strong {
  font-family: var(--heading-font);
  font-size: 24px;
  letter-spacing: .04em;
  color: var(--text);
}

.page-about .tech-flow-step:first-child strong {
  color: var(--orange-bright);
}

.page-about .tech-flow-step:last-child strong {
  color: var(--cyan-light);
}

.page-about .tech-flow-step small {
  font-size: 12px;
  color: var(--muted);
}

.page-about .tech-flow-arrow {
  display: none;
}

/* ===== 发展里程碑 ===== */
.page-about .about-milestones-head {
  display: grid;
  justify-items: center;
  gap: 6px;
  margin-bottom: 36px;
  text-align: center;
}

.page-about .about-milestones-head h2 {
  margin: 0;
  font-size: clamp(36px, 7vw, 64px);
  line-height: 1;
  letter-spacing: .04em;
  color: var(--text);
}

.page-about .about-milestones-head p {
  margin: 0;
  font-size: 15px;
  color: var(--muted);
}

.page-about .about-milestone-cover {
  position: relative;
  max-width: 440px;
  margin: 0 auto 52px;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-milestone-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid rgba(0,168,181,.3);
  border-radius: var(--radius-lg);
  pointer-events: none;
}

.page-about .about-milestone-cover img {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.page-about .timeline {
  position: relative;
  display: grid;
  gap: 32px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(to bottom, var(--orange), var(--cyan-light));
  opacity: .45;
}

.page-about .timeline-item {
  position: relative;
  display: grid;
  padding-left: 34px;
}

.page-about .timeline-dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--panel-2);
  border: 3px solid var(--orange);
  box-shadow: 0 0 0 5px rgba(255,106,0,.13);
}

.page-about .timeline-body {
  padding: 22px 24px;
  background: linear-gradient(160deg, var(--panel), var(--panel));
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: transform var(--transition), border-color var(--transition);
}

.page-about .timeline-item:hover .timeline-body {
  transform: translateX(6px);
  border-color: rgba(255,106,0,.6);
}

.page-about .timeline-year {
  display: inline-block;
  margin-bottom: 12px;
  padding: 4px 12px;
  border: 1px solid rgba(255,106,0,.28);
  border-radius: var(--radius-pill);
  background: rgba(255,106,0,.1);
  font-family: var(--data-font);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--orange-bright);
}

.page-about .timeline-body h3 {
  margin: 0 0 6px;
  font-size: 22px;
  letter-spacing: .03em;
  color: var(--text);
}

.page-about .timeline-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ===== 收尾CTA ===== */
.page-about .about-cta {
  text-align: center;
  background: linear-gradient(180deg, transparent, rgba(255,106,0,.05));
}

.page-about .about-cta h2 {
  margin: 0 0 12px;
  font-size: clamp(28px, 5vw, 48px);
  color: var(--text);
}

.page-about .about-cta p {
  max-width: 560px;
  margin: 0 auto 28px;
  font-size: 15px;
  color: var(--muted);
}

.page-about .about-cta-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

/* ===== 平板与桌面 ===== */
@media (min-width: 720px) {
  .page-about .about-stats-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-stats-strip {
    justify-content: center;
  }

  .page-about .tech-flow-step {
    flex-basis: 180px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 96px 24px 96px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 64px;
  }

  .page-about .about-hero-visual {
    display: flex;
    justify-content: center;
  }

  .page-about .about-story-grid {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
    gap: 60px;
  }

  .page-about .about-tech-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 60px;
  }

  .page-about .about-tech-figure {
    order: 2;
  }

  .page-about .tech-flow {
    display: grid;
    grid-template-columns: 1fr 20px 1fr 20px 1fr 20px 1fr;
    align-items: stretch;
    gap: 0;
  }

  .page-about .tech-flow-step {
    flex: none;
  }

  .page-about .tech-flow-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--orange);
  }

  /* 桌面时间轴 */
  .page-about .timeline {
    row-gap: 48px;
    padding-top: 8px;
  }

  .page-about .timeline::before {
    left: 50%;
    top: 4px;
    bottom: 4px;
    transform: translateX(-1px);
  }

  .page-about .timeline-item {
    width: calc(50% - 56px);
    padding-left: 0;
  }

  .page-about .timeline-item:nth-child(odd) {
    margin-right: auto;
    margin-left: 0;
  }

  .page-about .timeline-item:nth-child(even) {
    margin-left: auto;
    margin-right: 0;
  }

  .page-about .timeline-dot {
    left: auto;
    right: -64px;
  }

  .page-about .timeline-item:nth-child(even) .timeline-dot {
    right: auto;
    left: -64px;
  }

  .page-about .timeline-item:hover .timeline-body {
    transform: translateY(-4px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
  }
}