.page-about {
  --about-gold-soft: rgba(245, 201, 107, 0.12);
  --about-gold-glow: rgba(245, 201, 107, 0.28);
  --about-line-fade: linear-gradient(90deg, rgba(245, 201, 107, 0.7) 0%, rgba(245, 201, 107, 0.12) 100%);
  --about-doc-bg: rgba(255, 255, 255, 0.03);
  --about-rail-w: 224px;
  background: transparent;
}

.page-about .container {
  max-width: var(--content-max);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.page-about .section-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold-halo);
  margin-bottom: 16px;
  display: inline-block;
  border-left: 3px solid var(--gold-deep);
  padding-left: 12px;
}

.page-about .serif-accent {
  font-family: var(--font-serif);
  color: var(--muted-blue);
  font-size: 1rem;
  line-height: 1.8;
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding: 100px 0 56px;
  background:
    radial-gradient(480px 240px at 82% 18%, rgba(21, 36, 90, 0.55), transparent 70%),
    radial-gradient(620px 320px at 8% 76%, rgba(21, 36, 90, 0.35), transparent 72%);
  border-bottom: 1px solid var(--glass-line);
}

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

.page-about .hero-copy {
  margin-bottom: 40px;
}

.page-about .hero-copy h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.2rem, 5.4vw, 4.2rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--star-white);
  margin: 0 0 24px;
}

.page-about .hero-lede {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--muted-blue);
  max-width: 640px;
  margin: 0 0 32px;
}

.page-about .hero-meta {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--muted-blue);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.page-about .hero-meta .mono-num {
  font-family: var(--font-mono);
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--gold-halo);
}

.page-about .meta-sep {
  color: var(--gold-deep);
  font-size: 0.875rem;
}

.page-about .hero-visual {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--glass-line);
  box-shadow: 0 24px 80px rgba(5, 7, 20, 0.6);
}

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

/* 档案夹布局 */
.page-about .about-layout {
  display: block;
  position: relative;
  padding-top: 48px;
  padding-bottom: 96px;
}

.page-about .about-rail {
  display: none;
}

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

.page-about .about-section {
  position: relative;
  padding-top: 72px;
  border-top: 1px solid var(--glass-line);
  margin-top: 48px;
}

.page-about .about-section:first-child {
  border-top: none;
  margin-top: 0;
}

.page-about .section-head {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 40px;
}

.page-about .section-index {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 600;
  color: transparent;
  -webkit-text-stroke: 1px var(--gold-deep);
  line-height: 1;
  flex-shrink: 0;
  margin-top: 4px;
  min-width: 44px;
}

.page-about .section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.2vw, 2.4rem);
  line-height: 1.2;
  color: var(--star-white);
  margin: 0 0 8px;
}

.page-about .section-desc {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--muted-blue);
  line-height: 1.6;
  margin: 0;
}

.page-about .glass-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-line);
  border-radius: var(--radius);
  backdrop-filter: blur(12px);
}

/* 平台档案 */
.page-about .profile-card {
  padding: 28px 24px;
}

.page-about .profile-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px 32px;
  margin: 0;
}

.page-about .profile-item {
  border-bottom: 1px solid var(--glass-line);
  padding-bottom: 16px;
}

.page-about .profile-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .profile-item dt {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold-halo);
  margin-bottom: 8px;
}

.page-about .profile-item dd {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--star-white);
  margin: 0;
}

/* 时间线 */
.page-about .timeline-list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .timeline-list::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, rgba(245, 201, 107, 0.7), rgba(245, 201, 107, 0.1));
}

.page-about .timeline-item {
  position: relative;
  padding-left: 40px;
  padding-bottom: 40px;
}

.page-about .timeline-item:last-child {
  padding-bottom: 0;
}

.page-about .timeline-dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: rgba(245, 201, 107, 0.16);
  border: 1px solid var(--gold-deep);
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .dot-core {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gold-halo);
  box-shadow: 0 0 12px var(--gold-halo);
}

.page-about .timeline-content {
  background: var(--glass-bg);
  border: 1px solid var(--glass-line);
  border-radius: 14px;
  padding: 20px;
  transition: border-color 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}

.page-about .timeline-item:hover .timeline-content {
  border-color: rgba(245, 201, 107, 0.4);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.24);
}

.page-about .timeline-year {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--gold-halo);
  letter-spacing: 0.08em;
  margin: 0 0 8px;
}

.page-about .timeline-heading {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--star-white);
  margin: 0 0 10px;
}

.page-about .timeline-content p:last-child {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--muted-blue);
  margin: 0;
}

/* 数据保障 */
.page-about .data-feature {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-bottom: 48px;
}

.page-about .data-visual {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--glass-line);
}

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

.page-about .data-points {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .data-point {
  padding: 22px 20px;
  position: relative;
}

.page-about .point-num {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gold-halo);
  display: block;
  margin-bottom: 8px;
}

.page-about .data-point h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.0625rem;
  color: var(--star-white);
  margin: 0 0 8px;
}

.page-about .data-point p {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--muted-blue);
  margin: 0;
}

.page-about .data-stats-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.page-about .stat-block {
  background: var(--about-gold-soft);
  border: 1px solid var(--about-gold-glow);
  border-radius: 14px;
  padding: 22px 16px;
  text-align: center;
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--gold-halo);
  display: block;
  margin-bottom: 6px;
}

.page-about .stat-label {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  color: var(--muted-blue);
  display: block;
}

/* 团队与资质 */
.page-about .team-visual {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--glass-line);
  margin-bottom: 32px;
}

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

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 40px;
}

.page-about .team-card {
  padding: 24px;
}

.page-about .team-card h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--star-white);
  margin: 0 0 10px;
}

.page-about .team-card p {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--muted-blue);
  margin: 0;
}

.page-about .cert-block {
  border-top: 1px solid var(--glass-line);
  padding-top: 32px;
}

.page-about .cert-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.125rem;
  color: var(--star-white);
  margin: 0 0 24px;
  position: relative;
  padding-left: 14px;
}

.page-about .cert-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 4px;
  height: 16px;
  background: linear-gradient(180deg, var(--gold-halo), transparent);
  border-radius: 4px;
}

.page-about .cert-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .cert-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-line);
  border-radius: 14px;
  padding: 20px 18px;
  transition: border-color 0.3s;
}

.page-about .cert-item:hover {
  border-color: rgba(245, 201, 107, 0.4);
}

.page-about .cert-icon {
  flex: 0 0 40px;
  width: 40px;
  height: 40px;
}

.page-about .cert-copy h4 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  color: var(--star-white);
  margin: 0 0 6px;
}

.page-about .cert-copy p {
  font-family: var(--font-body);
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--muted-blue);
  margin: 0;
}

/* 合规与联系 */
.page-about .compliance-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 32px;
}

.page-about .compliance-card {
  padding: 24px;
}

.page-about .compliance-card h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.0625rem;
  color: var(--star-white);
  margin: 0 0 14px;
}

.page-about .compliance-card p {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--muted-blue);
  margin: 0 0 12px;
}

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

.page-about .compliance-card a {
  color: var(--gold-halo);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(245, 201, 107, 0.4);
}

.page-about .contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .contact-list li {
  padding: 8px 0;
  border-bottom: 1px solid var(--glass-line);
  font-size: 0.9375rem;
  color: var(--star-white);
}

.page-about .contact-list li:last-child {
  border-bottom: none;
}

.page-about .contact-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted-blue);
  margin-right: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.page-about .contact-list a {
  color: var(--star-white);
  text-decoration: none;
  transition: color 0.2s;
}

.page-about .contact-list a:hover {
  color: var(--gold-halo);
}

.page-about .compliance-card .mono-num {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--gold-halo);
}

.page-about .compliance-card .footer-icp {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--gold-halo);
  letter-spacing: 0.05em;
  margin-top: 12px;
}

.page-about .compliance-footer-note {
  border-left: 3px solid var(--gold-deep);
  padding: 20px 24px;
  background: var(--about-gold-soft);
  border-radius: 0 14px 14px 0;
  display: grid;
  gap: 12px;
}

.page-about .compliance-footer-note p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--muted-blue);
  line-height: 1.8;
}

.page-about .compliance-footer-note a {
  color: var(--gold-halo);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(245, 201, 107, 0.35);
}

/* ===== 桌面端媒体查询 ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 140px 0 80px;
  }

  .page-about .hero-inner {
    display: grid;
    grid-template-columns: 7fr 5fr;
    gap: 48px;
    align-items: center;
  }

  .page-about .hero-copy {
    margin-bottom: 0;
  }

  .page-about .hero-visual {
    min-height: 260px;
  }

  .page-about .profile-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .data-feature {
    grid-template-columns: 5fr 7fr;
    align-items: stretch;
  }

  .page-about .data-points {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }

  .page-about .data-point {
    padding: 20px 18px;
  }

  .page-about .team-grid.grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .tech-stack {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .page-about .compliance-card:first-child {
    grid-column: span 2;
  }
}

@media (min-width: 1100px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 88px;
    align-self: start;
    padding-top: 48px;
  }

  .page-about .rail-caption {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--gold-deep);
    margin: 0 0 16px;
    padding-left: 14px;
  }

  .page-about .rail-list {
    list-style: none;
    margin: 0 0 24px;
    padding: 0;
    border-left: 1px solid var(--glass-line);
  }

  .page-about .rail-link {
    display: block;
    font-family: var(--font-body);
    font-size: 0.875rem;
    color: var(--muted-blue);
    text-decoration: none;
    padding: 9px 0 9px 14px;
    border-left: 2px solid transparent;
    margin-left: -1px;
    transition: color 0.2s, border-color 0.2s;
    line-height: 1.4;
  }

  .page-about .rail-link:hover {
    color: var(--gold-halo);
    border-left-color: rgba(245, 201, 107, 0.5);
  }

  .page-about .rail-notes {
    padding-left: 14px;
  }

  .page-about .rail-notes .status-pill {
    font-size: 0.75rem;
    color: var(--muted-blue);
    margin-bottom: 16px;
  }

  .page-about .rail-quote {
    font-size: 0.875rem;
    font-style: italic;
    color: var(--gold-deep);
  }

  .page-about .about-docs {
    padding-right: 8px;
  }

  .page-about .about-section {
    scroll-margin-top: 84px;
  }

  .page-about .profile-item dt {
    font-size: 0.6875rem;
  }

  .page-about .profile-item dd {
    font-size: 1.0625rem;
  }

  .page-about .data-stats-row {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }

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

  .page-about .cert-item {
    flex-direction: column;
    padding: 24px 20px;
  }

  .page-about .cert-copy h4 {
    font-size: 1.0625rem;
  }
}