.page-about {
  --about-gold-soft: rgba(212, 175, 55, 0.08);
  --about-line-soft: rgba(212, 175, 55, 0.16);
  --about-pad: clamp(56px, 8vw, 100px);
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(ellipse 70% 45% at 92% 6%, rgba(212, 175, 55, 0.05), transparent 65%),
    radial-gradient(ellipse 55% 40% at 4% 42%, rgba(10, 17, 40, 0.7), transparent 70%);
}

/* 面包屑 */
.page-about .about-crumb {
  padding-top: 28px;
}

.page-about .breadcrumb {
  gap: 6px;
}

.page-about .breadcrumb-item a {
  color: var(--color-gray);
  text-decoration: none;
  transition: color 0.3s ease;
}

.page-about .breadcrumb-item a:hover,
.page-about .breadcrumb-item a:focus-visible {
  color: var(--color-gold);
}

.page-about .breadcrumb-item[aria-current="page"] {
  color: var(--color-gold);
}

/* Hero 首屏 */
.page-about .about-hero {
  padding: clamp(36px, 7vw, 80px) 0 clamp(48px, 8vw, 96px);
}

.page-about .about-hero-grid {
  display: grid;
  gap: 36px;
}

.page-about .about-kicker {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: 14px;
}

.page-about .about-hero h1 {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(2rem, 5vw, 3.8rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--color-white);
  margin-bottom: 22px;
}

.page-about .about-hero-desc {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 1.02rem;
  line-height: 1.75;
  color: var(--color-gray);
  max-width: 560px;
  margin-bottom: 30px;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-hero-visual {
  position: relative;
}

.page-about .about-hero-visual::before {
  content: "";
  position: absolute;
  inset: 12px -12px -12px 12px;
  border: 1px solid var(--about-line-soft);
  border-radius: var(--radius);
  pointer-events: none;
}

.page-about .about-hero-img {
  position: relative;
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--color-gold-line);
  object-fit: cover;
}

/* 品牌起点与使命 */
.page-about .about-mission {
  padding: var(--about-pad) 0;
  background: linear-gradient(120deg, rgba(0, 0, 0, 0.28), transparent 70%);
}

.page-about .about-mission-layout {
  display: grid;
  gap: 36px;
  margin-top: 36px;
}

.page-about .about-mission-text p {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-gray);
  margin-bottom: 18px;
}

.page-about .about-mission-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-stat {
  background: var(--color-card);
  border: 1px solid var(--about-line-soft);
  border-radius: var(--radius);
  padding: 22px 14px;
  text-align: center;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-stat:hover {
  border-color: var(--color-gold-line);
  box-shadow: 0 0 28px var(--color-gold-glow);
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  font-weight: 700;
  color: var(--color-gold);
  line-height: 1.2;
}

.page-about .about-stat-label {
  display: block;
  margin-top: 8px;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--color-gray);
}

/* 发展里程碑 */
.page-about .about-milestones {
  padding: clamp(64px, 10vw, 120px) 0;
}

.page-about .about-milestones .section-head {
  margin-bottom: 40px;
}

.page-about .about-timeline-wrap {
  position: relative;
}

.page-about .about-timeline-bg {
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translateX(-50%);
  width: min(960px, 92%);
  height: auto;
  opacity: 0.15;
  border-radius: var(--radius);
  pointer-events: none;
  z-index: 0;
  filter: saturate(0.6);
}

.page-about .about-timeline {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 12px 0 0 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 11px;
  width: 1px;
  background: linear-gradient(to bottom, transparent, var(--color-gold-line) 12%, var(--color-gold-line) 88%, transparent);
}

.page-about .about-timeline-item {
  position: relative;
  padding-bottom: 44px;
}

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 6px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 2px solid var(--color-gold);
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.14);
  transition: background 0.35s ease, box-shadow 0.35s ease, transform 0.35s ease;
}

.page-about .about-timeline-item.is-visible::before {
  background: var(--color-gold);
  box-shadow: 0 0 0 8px rgba(212, 175, 55, 0.2);
}

.page-about .about-timeline-item:hover::before,
.page-about .about-timeline-item:focus-within::before {
  background: var(--color-gold);
  box-shadow: 0 0 0 8px rgba(212, 175, 55, 0.22);
  transform: scale(1.15);
}

.page-about .about-timeline-node {
  background: rgba(28, 35, 51, 0.72);
  border: 1px solid var(--about-line-soft);
  border-left: 2px solid var(--color-gold);
  border-radius: var(--radius);
  padding: 22px 24px;
  transition: border-color 0.35s ease, box-shadow 0.35s ease, background 0.35s ease;
}

.page-about .about-timeline-item:hover .about-timeline-node,
.page-about .about-timeline-item:focus-within .about-timeline-node {
  border-color: var(--color-gold-line);
  background: rgba(28, 35, 51, 0.95);
  box-shadow: 0 0 36px var(--color-gold-glow);
}

.page-about .about-timeline-phase {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-bottom: 10px;
}

.page-about .about-timeline-node h3 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-white);
  margin-bottom: 10px;
}

.page-about .about-timeline-node p {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-gray);
  margin: 0;
}

/* 透明化机制 */
.page-about .about-transparency {
  padding: var(--about-pad) 0;
  background: linear-gradient(90deg, rgba(0, 0, 0, 0.35) 0%, rgba(10, 17, 40, 0.2) 100%);
}

.page-about .about-transparency-grid {
  display: grid;
  gap: 32px;
  margin-top: 36px;
}

.page-about .about-trans-lead {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 1.02rem;
  line-height: 1.8;
  color: var(--color-gray);
  margin-bottom: 24px;
}

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

.page-about .about-trans-list li {
  position: relative;
  padding: 12px 0 12px 26px;
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 0.96rem;
  line-height: 1.6;
  color: var(--color-gray);
  border-bottom: 1px solid rgba(138, 148, 166, 0.12);
}

.page-about .about-trans-list li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 20px;
  width: 8px;
  height: 8px;
  background: var(--color-gold);
  transform: rotate(45deg);
}

.page-about .about-trans-card {
  background: linear-gradient(145deg, var(--color-card), var(--color-bg-dark));
  border: 1px solid var(--color-gold-line);
  border-radius: var(--radius);
  padding: 32px 28px;
  position: relative;
  overflow: hidden;
}

.page-about .about-trans-card::after {
  content: "";
  position: absolute;
  top: -40px;
  right: -40px;
  width: 120px;
  height: 120px;
  background: radial-gradient(circle, rgba(212, 175, 55, 0.18), transparent 70%);
}

.page-about .about-trans-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--color-gold);
  border: 1px solid var(--color-gold-line);
  border-radius: 99px;
  padding: 5px 14px;
  margin-bottom: 20px;
}

.page-about .about-trans-quote {
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 1.12rem;
  line-height: 1.66;
  color: var(--color-white);
  margin-bottom: 18px;
}

.page-about .about-trans-sign {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--color-gray);
}

/* 服务能力体系 */
.page-about .about-services {
  padding: var(--about-pad) 0;
}

.page-about .about-services-grid {
  display: grid;
  gap: 36px;
  margin-top: 36px;
}

.page-about .about-services-list {
  display: grid;
  gap: 18px;
}

.page-about .about-service-item {
  background: var(--color-card);
  border: 1px solid transparent;
  border-left: 2px solid var(--color-gold);
  border-radius: var(--radius);
  padding: 24px 26px;
  transition: background 0.35s ease, box-shadow 0.35s ease;
}

.page-about .about-service-item:hover {
  background: linear-gradient(145deg, var(--color-card), var(--color-bg-dark));
  box-shadow: 0 0 32px var(--color-gold-glow);
}

.page-about .about-service-code {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--color-gold);
  margin-bottom: 8px;
}

.page-about .about-service-item h3 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-white);
  margin-bottom: 8px;
}

.page-about .about-service-item p {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-gray);
  margin: 0;
}

.page-about .about-services-visual {
  position: relative;
}

.page-about .about-services-img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--color-gold-line);
  object-fit: cover;
}

/* 荣誉与认证 */
.page-about .about-honors {
  padding: var(--about-pad) 0 clamp(72px, 10vw, 120px);
}

.page-about .about-honors-grid {
  display: grid;
  gap: 20px;
  margin-top: 36px;
}

.page-about .about-honor-card {
  padding: 30px 26px;
  transition: box-shadow 0.35s ease, transform 0.35s ease;
}

.page-about .about-honor-card:hover {
  box-shadow: 0 0 40px var(--color-gold-glow);
  transform: translateY(-4px);
}

.page-about .about-honor-card h3 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-white);
  margin: 16px 0 12px;
}

.page-about .about-honor-card p {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-gray);
  margin: 0;
}

.page-about .about-honors-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 40px;
}

/* 小屏增强：统计与荣誉卡多列 */
@media (min-width: 620px) {
  .page-about .about-mission-stats {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .page-about .about-honors-cta {
    justify-content: flex-start;
  }
}

/* 桌面断点 */
@media (min-width: 860px) {
  .page-about .about-hero-grid {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
    gap: 64px;
  }

  .page-about .about-hero-copy {
    padding-right: 24px;
  }

  .page-about .about-hero h1 {
    font-size: clamp(2.6rem, 5vw, 4.2rem);
  }

  .page-about .about-hero-desc {
    font-size: 1.08rem;
  }

  .page-about .about-mission-layout {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 64px;
    align-items: start;
  }

  .page-about .about-mission-stats {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .page-about .about-stat {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    text-align: left;
    padding: 18px 22px;
  }

  .page-about .about-stat-num {
    font-size: 2.1rem;
  }

  /* 时间轴桌面错位叙事 */
  .page-about .about-timeline {
    padding: 24px 0 0;
  }

  .page-about .about-timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about .about-timeline-item {
    width: 50%;
    padding-right: 56px;
    padding-bottom: 56px;
    text-align: right;
  }

  .page-about .about-timeline-item:nth-child(even) {
    margin-left: 50%;
    padding-right: 0;
    padding-left: 56px;
    text-align: left;
  }

  .page-about .about-timeline-item::before {
    left: auto;
    right: -6.5px;
  }

  .page-about .about-timeline-item:nth-child(even)::before {
    right: auto;
    left: -6.5px;
  }

  .page-about .about-timeline-node {
    background: var(--color-card);
  }

  .page-about .about-timeline-item:nth-child(odd) .about-timeline-node {
    border-left: 1px solid var(--about-line-soft);
    border-right: 2px solid var(--color-gold);
  }

  .page-about .about-transparency-grid {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 64px;
    align-items: center;
  }

  .page-about .about-services-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 56px;
    align-items: center;
  }

  .page-about .about-honors-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
}