/* ===== 品牌概况 · 页面专属样式 ===== */
.page-about {
  --about-grid-line: rgba(69, 162, 158, 0.07);
  --about-grid-strong: rgba(69, 162, 158, 0.18);
  --about-glow-purple: rgba(176, 38, 255, 0.18);
  --about-glow-yellow: rgba(254, 228, 64, 0.14);
  position: relative;
  background-color: #0B0C10;
  background-image:
    linear-gradient(rgba(69, 162, 158, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(69, 162, 158, 0.045) 1px, transparent 1px);
  background-size: 44px 44px;
  color: #FFFFFF;
  line-height: 1.6;
}

/* 面包屑 */
.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 24px 0 6px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--gray);
}
.page-about .breadcrumbs a {
  color: var(--blue);
  text-decoration: none;
  transition: color 0.2s ease;
}
.page-about .breadcrumbs a:hover {
  color: var(--yellow);
}

/* 区块索引 */
.page-about .section-index {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.1em;
  color: var(--blue);
  text-transform: uppercase;
}
.page-about .section-index::after {
  content: "";
  width: 44px;
  height: 1px;
  background: var(--border);
}
.page-about .section-heading-row {
  margin-bottom: 36px;
}
.page-about .section-heading-row h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.8vw, 2.3rem);
  line-height: 1.2;
}

/* 首屏头部 */
.page-about .about-hero {
  position: relative;
  padding: 30px 0 56px;
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-line) 1px, transparent 1px);
  background-size: 28px 28px;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 180px;
  height: 180px;
  background: linear-gradient(135deg, transparent 44%, var(--about-glow-purple) 100%);
  clip-path: polygon(100% 0, 0 0, 100% 100%);
  pointer-events: none;
}
.page-about .about-hero > * {
  position: relative;
  z-index: 1;
}
.page-about .about-hero h1 {
  margin: 14px 0 18px;
  max-width: 820px;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 5vw, 3.4rem);
  line-height: 1.12;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  text-shadow: 0 0 30px var(--about-glow-purple);
}
.page-about .about-hero__lead {
  max-width: 720px;
  margin-bottom: 22px;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--gray);
}
.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 品牌故事 */
.page-about .about-story {
  position: relative;
  padding: 64px 0;
}
.page-about .about-story__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: start;
}
.page-about .about-story__text h2 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.8vw, 2.2rem);
  line-height: 1.2;
}
.page-about .about-story__text p {
  margin: 0 0 16px;
  color: var(--gray);
  font-size: 0.95rem;
}
.page-about .about-story__text a {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s ease;
}
.page-about .about-story__text a:hover {
  color: var(--yellow);
}
.page-about .about-story__points {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .about-story__points li {
  position: relative;
  padding-left: 22px;
  font-size: 0.92rem;
  color: var(--white);
}
.page-about .about-story__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 8px;
  height: 8px;
  background: var(--blue);
  transform: rotate(45deg);
}
.page-about .about-story__points li strong {
  color: var(--yellow);
  font-weight: 600;
}
.page-about .about-story__figure {
  margin: 0;
  position: relative;
}
.page-about .about-story__figure img {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--border);
  background: var(--bg-1);
}
.page-about .about-story__figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--gray);
  letter-spacing: 0.08em;
}

/* 量化数据区 */
.page-about .about-stats {
  position: relative;
  padding: 64px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background-color: rgba(31, 40, 51, 0.35);
}
.page-about .stats-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}
.page-about .stats-grid__left {
  display: grid;
  gap: 22px;
}
.page-about .stats-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 16px;
  align-items: baseline;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
}
.page-about .stats-item__num {
  grid-row: 1;
  font-family: var(--font-mono);
  font-size: 3rem;
  line-height: 1;
  color: var(--yellow);
  text-shadow: 0 0 22px var(--about-glow-yellow);
}
.page-about .stats-item__unit {
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--gray);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.page-about .stats-item__desc {
  grid-column: 2;
  margin: 0;
  color: var(--gray);
  font-size: 0.9rem;
}
.page-about .stats-grid__right {
  display: grid;
  gap: 18px;
}
.page-about .stats-card {
  position: relative;
  padding: 22px 24px;
  border: 1px solid var(--border);
  background: linear-gradient(135deg, var(--bg-1), rgba(31, 40, 51, 0.6));
}
.page-about .stats-card--blue {
  border-top: 3px solid var(--blue);
}
.page-about .stats-card__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--gray);
  text-transform: uppercase;
}
.page-about .stats-card__num {
  font-family: var(--font-mono);
  font-size: 2.6rem;
  line-height: 1.1;
  color: var(--blue);
}
.page-about .stats-card__suffix {
  font-size: 1.3rem;
  color: var(--gray);
  margin-left: 4px;
}
.page-about .stats-card__note {
  margin: 10px 0 0;
  color: var(--gray);
  font-size: 0.88rem;
  line-height: 1.6;
}
.page-about .stats-grid__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 18px 24px;
  border: 1px dashed var(--border);
  font-size: 0.92rem;
  color: var(--white);
  letter-spacing: 0.04em;
}
.page-about .stats-grid__brand .mono {
  color: var(--purple);
}

/* 发展里程碑 */
.page-about .about-milestones {
  position: relative;
  padding: 64px 0;
}
.page-about .milestone-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}
.page-about .milestone-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
  position: relative;
}
.page-about .milestone-timeline::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 5px;
  width: 2px;
  background: linear-gradient(180deg, var(--blue) 0%, var(--purple) 70%, transparent 100%);
}
.page-about .timeline-item {
  position: relative;
  padding: 0 0 32px 20px;
}
.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-0);
  border: 3px solid var(--blue);
  box-shadow: 0 0 14px rgba(69, 162, 158, 0.6);
}
.page-about .timeline-item:last-child {
  padding-bottom: 0;
}
.page-about .timeline-item__year {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--yellow);
  letter-spacing: 0.12em;
  margin-bottom: 4px;
}
.page-about .timeline-item__card {
  padding: 16px 18px;
  border: 1px solid var(--border);
  background: rgba(31, 40, 51, 0.5);
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}
.page-about .timeline-item__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}
.page-about .timeline-item__card p {
  margin: 0 0 12px;
  color: var(--gray);
  font-size: 0.9rem;
  line-height: 1.65;
}
.page-about .timeline-item:hover .timeline-item__card {
  border-color: var(--blue);
  box-shadow: 0 0 24px var(--about-grid-strong), 0 0 6px var(--blue);
  transform: translateX(4px);
}
.page-about .milestone-aside img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--border);
}
.page-about .milestone-aside__caption {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--gray);
  letter-spacing: 0.08em;
}

/* 团队与文化 */
.page-about .about-team {
  position: relative;
  padding: 64px 0;
  border-top: 1px solid var(--border);
}
.page-about .team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}
.page-about .team-layout__figure {
  margin: 0;
}
.page-about .team-layout__figure img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--border);
  background: var(--bg-1);
}
.page-about .team-layout__figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--gray);
  letter-spacing: 0.08em;
}
.page-about .team-layout__content > p {
  margin: 0 0 16px;
  color: var(--gray);
  font-size: 0.95rem;
}
.page-about .team-layout__content .accordion {
  margin-top: 20px;
}
.page-about .team-layout__content .accordion__handle {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--white);
}
.page-about .team-layout__content .accordion__handle .mono {
  color: var(--blue);
  margin-right: 12px;
}

/* 资质与合作 */
.page-about .about-credential {
  padding: 64px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background-color: rgba(31, 40, 51, 0.25);
}
.page-about .credential-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}
.page-about .credential-card {
  position: relative;
  padding: 24px;
  border: 1px solid var(--border);
  background: var(--bg-0);
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.page-about .credential-card:hover {
  border-color: var(--blue);
  box-shadow: 0 0 22px var(--about-grid-strong);
}
.page-about .credential-card__icon {
  display: block;
  font-size: 1.8rem;
  margin-bottom: 14px;
  color: var(--purple);
}
.page-about .credential-card h3 {
  margin: 0 0 10px;
  font-size: 1.15rem;
  line-height: 1.3;
}
.page-about .credential-card p {
  margin: 0;
  color: var(--gray);
  font-size: 0.9rem;
  line-height: 1.65;
}
.page-about .credential-partners {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}
.page-about .credential-partners__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--gray);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.page-about .credential-partners__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .credential-note {
  margin: 28px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  color: var(--gray);
  font-size: 0.88rem;
  line-height: 1.7;
}
.page-about .credential-note a {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s ease;
}
.page-about .credential-note a:hover {
  color: var(--yellow);
}

/* 下一步 CTA */
.page-about .about-next {
  padding: 56px 0 72px;
}
.page-about .about-next__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding: 36px;
  border: 1px solid var(--border);
  background:
    linear-gradient(135deg, rgba(69, 162, 158, 0.12), transparent 60%),
    var(--bg-1);
  overflow: hidden;
}
.page-about .about-next__inner::after {
  content: "NEXT ▸";
  position: absolute;
  right: 16px;
  top: 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--blue);
  letter-spacing: 0.14em;
  opacity: 0.6;
}
.page-about .about-next__inner h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 2.4vw, 1.9rem);
  line-height: 1.2;
}
.page-about .about-next__inner p {
  margin: 0;
  color: var(--gray);
  font-size: 0.92rem;
}
.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 平板及以上 */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 48px 0 72px;
  }
  .page-about .about-story__grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
  }
  .page-about .stats-grid {
    grid-template-columns: 1.25fr 1fr;
    gap: 56px;
  }
  .page-about .stats-item__num {
    font-size: 3.6rem;
  }
  .page-about .milestone-layout {
    grid-template-columns: 1fr 320px;
    gap: 48px;
  }
  .page-about .team-layout {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
  }
  .page-about .credential-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }
  .page-about .about-next__inner {
    grid-template-columns: 1.2fr 1fr;
    align-items: center;
    padding: 40px 44px;
  }
}

/* 桌面 */
@media (min-width: 1024px) {
  .page-about .about-hero {
    padding: 64px 0 88px;
  }
  .page-about .about-hero__lead {
    font-size: 1.08rem;
  }
  .page-about .about-story,
  .page-about .about-stats,
  .page-about .about-milestones,
  .page-about .about-team,
  .page-about .about-credential {
    padding: 88px 0;
  }
  .page-about .stats-item__num {
    font-size: 4rem;
  }
}