.page-about {
  --about-accent: #FF6B35;
  --about-accent-soft: #FF9A6C;
  --about-card-bg: #0E2A42;
  --about-border: #1E3A5F;
  --about-muted: #B0C4DE;
  background: #0A192F;
  color: #F5F7FA;
  overflow-x: hidden;
}

.page-about .crumb-nav {
  padding-top: 2.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--line-blue);
}

.page-about .crumb-link {
  color: var(--blue-gray);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .crumb-link:hover {
  color: var(--orange-main);
}

.page-about .crumb-sep {
  color: var(--blue-gray);
  margin: 0 0.5rem;
}

/* ===== Hero区域 ===== */
.about-hero {
  position: relative;
  padding: 3rem 0 4rem;
}

.about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 60%;
  height: 72%;
  background: linear-gradient(150deg, #143A5C 0%, transparent 72%);
  clip-path: polygon(18% 0, 100% 0, 100% 100%, 0 100%);
  z-index: 0;
  opacity: 0.8;
}

.about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

.about-hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--about-accent);
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 0.8125rem;
  margin-bottom: 1.5rem;
}

.about-hero-eyebrow::before {
  content: "";
  width: 2rem;
  height: 2px;
  background: var(--about-accent);
}

.about-hero-main h1 {
  font-family: var(--font-head);
  font-size: var(--h1-size);
  line-height: 0.95;
  text-transform: uppercase;
  margin: 0 0 1.75rem;
  letter-spacing: -0.01em;
}

.about-hero-accent {
  color: var(--about-accent);
}

.about-hero-lead {
  font-size: var(--body-size);
  line-height: 1.75;
  color: var(--about-muted);
  max-width: 35rem;
  margin-bottom: 1.75rem;
}

.about-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.about-hero-tag {
  display: inline-block;
  padding: 0.375rem 1rem;
  border: 1px solid var(--about-border);
  border-radius: 999px;
  background: rgba(20, 58, 92, 0.35);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--about-muted);
}

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

.about-hero-actions .btn-solid,
.about-hero-actions .btn-line {
  min-width: 10rem;
  text-align: center;
}

/* 右侧索引卡片 */
.about-index-card {
  position: relative;
  background: var(--about-card-bg);
  border: 1px solid var(--about-border);
  border-radius: 18px;
  padding: 1.75rem 1.5rem;
  box-shadow: 12px 12px 0 rgba(20, 58, 92, 0.35);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
}

.about-index-tag {
  display: inline-block;
  background: var(--about-accent);
  color: #0A192F;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.25rem 0.85rem;
  border-radius: 8px;
  margin-bottom: 1.25rem;
}

.about-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.375rem;
}

.about-index-list a {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 0.75rem;
  border-radius: 10px;
  color: #F5F7FA;
  text-decoration: none;
  font-weight: 600;
  transition: background 0.25s ease, color 0.25s ease;
}

.about-index-list a:hover {
  background: rgba(20, 58, 92, 0.75);
  color: var(--about-accent);
}

.about-index-no {
  font-family: var(--font-head);
  color: var(--about-accent);
  font-size: 0.875rem;
  width: 1.5rem;
}

.about-index-foot {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--about-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--about-muted);
  font-size: 0.875rem;
}

.about-index-year,
.about-index-now {
  font-family: var(--font-head);
  font-size: 1rem;
  color: var(--about-accent);
}

.about-index-line {
  flex: 1;
  height: 1px;
  background: var(--about-border);
  margin: 0 1rem;
}

/* ===== 通用区块头 ===== */
.about-who,
.about-milestone,
.about-team,
.about-trust {
  padding: 3.5rem 0;
}

.about-section-head {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.about-section-no {
  font-family: var(--font-head);
  font-size: 2.5rem;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--about-accent);
  flex-shrink: 0;
}

.about-section-head-text h2 {
  font-family: var(--font-head);
  font-size: var(--h2-size);
  line-height: 1;
  text-transform: uppercase;
  margin: 0 0 0.5rem;
}

.about-section-intro {
  color: var(--about-muted);
  font-size: 1rem;
  line-height: 1.6;
  margin: 0;
}

/* ===== 我们是谁 ===== */
.about-who-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

.about-who-copy p {
  color: var(--about-muted);
  line-height: 1.8;
  margin-bottom: 1rem;
  font-size: var(--body-size);
}

.about-who-copy strong {
  color: var(--about-accent);
}

.about-who-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.about-stat-item {
  background: var(--about-card-bg);
  border: 1px solid var(--about-border);
  border-radius: 18px;
  padding: 1.5rem 1.25rem;
  position: relative;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.about-stat-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.25);
  border-color: var(--about-accent);
}

.about-stat-item .data-num {
  display: block;
  font-family: var(--font-head);
  font-size: 2.25rem;
  line-height: 1;
  color: var(--about-accent);
  margin-bottom: 0.5rem;
}

.about-stat-label {
  color: var(--about-muted);
  font-size: 0.875rem;
  font-weight: 600;
}

/* ===== 发展里程碑 ===== */
.about-milestone {
  background: linear-gradient(180deg, rgba(14, 42, 66, 0.35) 0%, transparent 100%);
}

.about-timeline {
  position: relative;
  padding-left: 1.5rem;
  display: grid;
  gap: 2rem;
}

.about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75rem;
  bottom: 0.75rem;
  width: 3px;
  background: linear-gradient(180deg, var(--about-accent) 0%, var(--about-accent-soft) 62%, rgba(255, 107, 53, 0) 100%);
}

.about-timeline-media {
  position: relative;
}

.about-timeline-media img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 18px;
  border: 1px solid var(--about-border);
}

.about-timeline-caption {
  display: inline-block;
  margin-top: 0.75rem;
  font-size: 0.875rem;
  color: var(--about-muted);
  letter-spacing: 0.08em;
}

.about-timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 4rem 1fr;
  gap: 1rem;
  align-items: start;
}

.about-timeline-dot {
  position: absolute;
  left: calc(-1.5rem + 2px);
  top: 0.625rem;
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
  background: var(--about-accent);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.2);
}

.about-timeline-year {
  font-family: var(--font-head);
  font-size: 1.5rem;
  line-height: 1.2;
  color: var(--about-accent);
  text-align: right;
  padding-top: 0.375rem;
}

.about-timeline-card {
  background: var(--about-card-bg);
  border: 1px solid var(--about-border);
  border-radius: 18px;
  padding: 1.375rem 1.5rem 1.5rem;
  position: relative;
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.about-timeline-card:hover {
  border-color: var(--about-accent);
  transform: translateX(4px);
}

.about-timeline-card h3 {
  font-family: var(--font-head);
  font-size: 1.25rem;
  line-height: 1.2;
  margin: 0 0 0.5rem;
  color: #F5F7FA;
}

.about-timeline-card p {
  color: var(--about-muted);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin: 0;
}

/* ===== 专业团队 ===== */
.about-team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.about-team-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
  margin-bottom: 1.5rem;
}

.about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.about-team-card {
  background: var(--about-card-bg);
  border: 1px solid var(--about-border);
  border-radius: 18px;
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.about-team-card::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 3rem;
  height: 3rem;
  background: linear-gradient(135deg, transparent 45%, var(--about-accent) 45%);
  opacity: 0.4;
}

.about-team-card:hover {
  background: rgba(20, 58, 92, 0.45);
  border-color: var(--about-accent);
}

.about-team-num {
  display: inline-block;
  font-family: var(--font-head);
  font-size: 1rem;
  color: var(--about-accent);
  margin-bottom: 0.75rem;
}

.about-team-card h3 {
  font-family: var(--font-head);
  font-size: 1.25rem;
  margin: 0 0 0.5rem;
  color: #F5F7FA;
}

.about-team-card p {
  color: var(--about-muted);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin: 0;
}

.about-team-side img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 18px;
  border: 1px solid var(--about-border);
}

.about-team-ratio {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.about-team-ratio-item {
  background: rgba(14, 42, 66, 0.6);
  border: 1px solid var(--about-border);
  border-radius: 12px;
  padding: 0.75rem;
  text-align: center;
}

.about-team-ratio-item strong {
  display: block;
  font-family: var(--font-head);
  font-size: 1.5rem;
  color: var(--about-accent);
}

.about-team-ratio-item span {
  font-size: 0.75rem;
  color: var(--about-muted);
}

.about-team-note {
  color: var(--about-muted);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin: 1.25rem 0 0;
}

/* ===== 资质与信任 ===== */
.about-trust {
  background: linear-gradient(180deg, transparent 0%, rgba(14, 42, 66, 0.4) 100%);
}

.about-trust-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

.about-trust-list {
  display: grid;
  gap: 1rem;
}

.about-trust-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  padding: 1.5rem;
  background: rgba(14, 42, 66, 0.6);
  border: 1px solid var(--about-border);
  border-radius: 18px;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.about-trust-item:hover {
  background: rgba(20, 58, 92, 0.5);
  border-color: var(--about-accent);
}

.about-trust-mark {
  font-family: var(--font-head);
  font-size: 1.375rem;
  color: var(--about-accent);
  line-height: 1;
}

.about-trust-item h3 {
  font-size: 1.125rem;
  margin: 0 0 0.375rem;
  color: #F5F7FA;
  font-weight: 700;
}

.about-trust-item p {
  color: var(--about-muted);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin: 0;
}

.about-trust-side {
  text-align: center;
}

.about-trust-side img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 24px;
  border: 3px solid var(--about-border);
  margin: 0 auto;
}

.about-trust-slogan {
  margin-top: 1.5rem;
  font-family: var(--font-head);
  font-size: 1.75rem;
  text-transform: uppercase;
  line-height: 1.2;
  color: var(--about-accent);
}

.about-trust-note {
  color: var(--about-muted);
  font-size: 0.875rem;
  line-height: 1.6;
  max-width: 24rem;
  margin: 1rem auto 0;
}

/* ===== CTA ===== */
.about-cta {
  padding: 3.5rem 0 4.5rem;
}

.about-cta-inner {
  position: relative;
  border: 1px solid var(--about-border);
  border-radius: 24px;
  background: linear-gradient(135deg, rgba(14, 42, 66, 0.9) 0%, rgba(20, 58, 92, 0.7) 100%);
  padding: 2.5rem 1.5rem;
  text-align: center;
  overflow: hidden;
}

.about-cta-inner::before {
  content: "";
  position: absolute;
  width: 220px;
  height: 220px;
  right: -80px;
  top: -80px;
  border-radius: 50%;
  background: var(--about-accent);
  opacity: 0.16;
}

.about-cta-inner h2 {
  position: relative;
  z-index: 1;
  font-family: var(--font-head);
  font-size: var(--h2-size);
  line-height: 1.05;
  text-transform: uppercase;
  margin: 0 0 1rem;
  color: #F5F7FA;
}

.about-cta-inner p {
  position: relative;
  z-index: 1;
  color: var(--about-muted);
  max-width: 40rem;
  margin: 0 auto 2rem;
  line-height: 1.7;
}

.about-cta-links {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

.about-cta-links .btn-solid,
.about-cta-links .btn-line {
  min-width: 10.5rem;
  text-align: center;
}

/* ===== 桌面布局 ===== */
@media (min-width: 900px) {
  .about-hero {
    padding: 4.5rem 0 5.5rem;
  }

  .about-hero-grid {
    grid-template-columns: 1.4fr 0.6fr;
    gap: 4rem;
    align-items: center;
  }

  .about-hero-index {
    position: sticky;
    top: 7rem;
  }

  .about-who,
  .about-milestone,
  .about-team,
  .about-trust {
    padding: 5rem 0;
  }

  .about-section-head {
    gap: 1.5rem;
    margin-bottom: 3rem;
  }

  .about-section-no {
    font-size: 3.5rem;
  }

  .about-who-grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
    align-items: start;
  }

  .about-who-stats {
    gap: 1.25rem;
  }

  .about-timeline {
    padding-left: 2.5rem;
    gap: 2.25rem;
  }

  .about-timeline-item {
    grid-template-columns: 6rem 1fr;
    gap: 1.75rem;
  }

  .about-timeline-year {
    font-size: 2rem;
  }

  .about-timeline-dot {
    left: calc(-2.5rem + 2px);
  }

  .about-team-layout {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 2.5rem;
    align-items: start;
  }

  .about-team-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
  }

  .about-team-side {
    position: sticky;
    top: 7rem;
  }

  .about-trust-layout {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
    align-items: start;
  }

  .about-trust-side {
    position: sticky;
    top: 7rem;
  }

  .about-cta {
    padding: 4rem 0 5.5rem;
  }

  .about-cta-inner {
    padding: 3.5rem;
  }
}