.page-about {
  background: var(--c-bg);
  color: var(--c-ink);
  overflow-x: clip;
}

/* ============ 01 首屏品牌宣言 ============ */
.page-about .about-hero {
  position: relative;
  padding: 40px 0 72px;
  background: linear-gradient(118deg, #1A1A1A 0%, #2D2D2D 68%, #3a3a3a 100%);
  color: var(--c-white);
}
.page-about .about-hero::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: min(38vw, 420px);
  height: 120px;
  background: repeating-linear-gradient(-45deg, transparent 0 14px, rgba(122, 199, 79, .16) 14px 16px);
  pointer-events: none;
}
.page-about .about-hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  color: var(--c-primary);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .18em;
  text-transform: uppercase;
}
.page-about .about-hero-tag::before {
  content: '';
  display: block;
  width: 30px;
  height: 4px;
  background: var(--c-accent);
}
.page-about .about-hero-copy h1 {
  font-family: var(--font-head);
  font-size: clamp(2.3rem, 6vw, 4.9rem);
  line-height: 1.02;
  letter-spacing: .02em;
  margin: 0 0 24px;
  text-transform: uppercase;
  text-shadow: 4px 4px 0 rgba(0, 0, 0, .35);
}
.page-about .about-hero-lead {
  max-width: 560px;
  margin: 0 0 32px;
  font-size: 1rem;
  line-height: 1.75;
  color: rgba(244, 241, 234, .88);
}
.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
.page-about .about-hero-visual {
  position: relative;
  margin-top: 38px;
  overflow: hidden;
  height: 260px;
  border: 1px solid rgba(255, 255, 255, .16);
  clip-path: polygon(0 2%, 100% 0, 100% 100%, 0 96%);
}
.page-about .about-hero-visual img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ============ 02 品牌起源与使命 ============ */
.page-about .about-origin {
  position: relative;
  padding: 88px 0 80px;
}
.page-about .about-origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}
.page-about .about-sec-tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  color: var(--c-accent);
  font-size: .76rem;
  font-weight: 800;
  letter-spacing: .2em;
  text-transform: uppercase;
}
.page-about .about-sec-tag::before {
  content: '';
  display: block;
  width: 36px;
  height: 2px;
  background: var(--c-primary);
}
.page-about .about-origin-head h2 {
  font-family: var(--font-head);
  font-size: clamp(1.9rem, 3.6vw, 3.2rem);
  line-height: 1.08;
  text-transform: uppercase;
  margin: 0 0 14px;
}
.page-about .about-origin-note {
  margin: 0;
  padding-left: 16px;
  border-left: 3px solid var(--c-primary);
  color: var(--c-gray);
  font-size: .9rem;
  line-height: 1.6;
}
.page-about .about-origin-body p {
  margin: 0 0 16px;
  font-size: .96rem;
  line-height: 1.8;
  color: #3A3A3A;
}
.page-about .about-origin-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 38px;
  padding-top: 28px;
  border-top: 3px solid var(--c-ink);
}
.page-about .about-origin-stat {
  padding: 8px 0 8px 14px;
  border-left: 4px solid var(--c-primary);
  min-width: 0;
  transition: transform .18s ease;
}
.page-about .about-origin-stat:hover {
  transform: translateX(4px);
}
.page-about .about-origin-stat .data-num {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(1.4rem, 8vw, 2.6rem);
  font-weight: 800;
  line-height: 1;
  color: var(--c-ink);
  white-space: nowrap;
}
.page-about .about-origin-stat-label {
  display: block;
  margin-top: 8px;
  font-size: .78rem;
  color: var(--c-gray);
  letter-spacing: .04em;
}

/* ============ 03 发展历程里程碑 ============ */
.page-about .about-timeline {
  position: relative;
  overflow: hidden;
  padding: 96px 0 88px;
  background: radial-gradient(ellipse at 85% 0%, rgba(122, 199, 79, .18) 0%, transparent 42%), var(--c-dark);
  color: var(--c-white);
}
.page-about .about-timeline-stripes {
  position: absolute;
  inset: auto 0 0 0;
  height: 12px;
  background: repeating-linear-gradient(115deg, var(--c-primary) 0 46px, transparent 46px 62px);
  opacity: .5;
  pointer-events: none;
}
.page-about .about-timeline-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 44px;
  margin-top: 48px;
}
.page-about .about-timeline-track {
  position: relative;
  padding-left: 24px;
}
.page-about .about-timeline-track::before {
  content: '';
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--c-primary), var(--c-accent) 68%, transparent);
}
.page-about .about-milestone {
  position: relative;
  padding: 0 0 46px;
}
.page-about .about-milestone:last-child {
  padding-bottom: 0;
}
.page-about .about-milestone::before {
  content: '';
  position: absolute;
  top: 10px;
  right: calc(100% + 6px);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--c-white);
  border: 4px solid var(--c-primary);
  box-shadow: 0 0 0 4px rgba(255, 255, 255, .08);
}
.page-about .about-milestone-meta {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 12px;
}
.page-about .about-milestone-year {
  font-family: var(--font-data);
  font-size: clamp(1.7rem, 3vw, 2.5rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--c-primary);
}
.page-about .about-milestone-phase {
  padding: 4px 10px;
  background: rgba(255, 111, 0, .12);
  color: var(--c-accent);
  font-size: .74rem;
  font-weight: 800;
  letter-spacing: .2em;
  text-transform: uppercase;
}
.page-about .about-milestone-card {
  padding: 18px 20px;
  background: rgba(255, 255, 255, .055);
  border: 1px solid rgba(255, 255, 255, .1);
  border-left: 4px solid var(--c-accent);
}
.page-about .about-milestone-card h3 {
  font-family: var(--font-head);
  font-size: 1.16rem;
  letter-spacing: .02em;
  text-transform: uppercase;
  margin: 0 0 10px;
  color: var(--c-white);
}
.page-about .about-milestone-card p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.7;
  color: rgba(244, 241, 234, .82);
}
.page-about .about-timeline-aside {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 20px;
}
.page-about .about-timeline-visual {
  width: 100%;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, .14);
  clip-path: polygon(0 0, 100% 4%, 100% 100%, 0 94%);
}
.page-about .about-timeline-visual img {
  display: block;
  width: 100%;
  height: auto;
}

/* ============ 04 技术架构与全球节点 ============ */
.page-about .about-tech {
  position: relative;
  padding: 96px 0;
  background: var(--c-ink);
  color: var(--c-white);
}
.page-about .about-tech-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 44px;
  margin-top: 48px;
}
.page-about .about-tech-map {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(122, 199, 79, .36);
  background: #222;
}
.page-about .about-tech-map::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(142deg, rgba(122, 199, 79, .1) 0%, transparent 36%, rgba(255, 111, 0, .16) 100%);
}
.page-about .about-tech-map img {
  display: block;
  width: 100%;
  height: auto;
  transition: transform .4s ease;
}
.page-about .about-tech-map:hover img {
  transform: scale(1.02);
}
.page-about .about-tech-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.page-about .about-tech-region {
  padding: 22px 22px 22px 30px;
  background: rgba(255, 255, 255, .04);
  border-left: 5px solid var(--c-primary);
}
.page-about .about-tech-region-tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 10px;
  background: var(--c-primary);
  color: #1A1A1A;
  font-size: .68rem;
  font-weight: 900;
  letter-spacing: .22em;
}
.page-about .about-tech-region h3 {
  font-family: var(--font-head);
  font-size: 1.06rem;
  text-transform: uppercase;
  margin: 0 0 10px;
  color: var(--c-white);
}
.page-about .about-tech-region p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.7;
  color: rgba(244, 241, 234, .78);
}
.page-about .about-tech-wall {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  margin-top: 56px;
  background: rgba(255, 255, 255, .08);
  border: 1px solid rgba(255, 255, 255, .08);
}
.page-about .about-tech-wall-item {
  padding: 26px 16px;
  text-align: center;
  background: rgba(45, 45, 45, .95);
  transition: background .2s ease;
}
.page-about .about-tech-wall-item:hover {
  background: rgba(122, 199, 79, .12);
}
.page-about .about-tech-wall-item .data-num {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(2rem, 5vw, 3.6rem);
  font-weight: 800;
  line-height: 1;
  color: var(--c-primary);
}
.page-about .about-tech-wall-label {
  display: block;
  margin-top: 10px;
  font-size: .76rem;
  letter-spacing: .12em;
  color: rgba(244, 241, 234, .88);
}

/* ============ 05 团队与组织 ============ */
.page-about .about-team {
  padding: 96px 0;
  background: var(--c-bg);
}
.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  margin-top: 48px;
}
.page-about .about-team-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.page-about .about-team-stat {
  position: relative;
  overflow: hidden;
  padding: 28px 20px;
  background: var(--c-white);
  border: 1px solid var(--c-line);
}
.page-about .about-team-stat::after {
  content: '';
  position: absolute;
  right: -28px;
  bottom: -28px;
  width: 88px;
  height: 88px;
  background: var(--c-primary-soft);
  transform: skewX(-14deg);
}
.page-about .about-team-stat .data-num {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(2.6rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1;
  color: var(--c-ink);
}
.page-about .about-team-stat-label {
  display: block;
  margin-top: 14px;
  font-size: .86rem;
  font-weight: 800;
  letter-spacing: .04em;
  color: var(--c-dark);
}
.page-about .about-team-copy p {
  margin: 0 0 16px;
  font-size: .96rem;
  line-height: 1.8;
  color: #3A3A3A;
}
.page-about .about-team-directions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 44px;
  padding-top: 28px;
  border-top: 3px solid var(--c-ink);
}
.page-about .about-team-direction {
  padding: 9px 15px;
  background: var(--c-white);
  border: 1px solid var(--c-line);
  font-family: var(--font-data);
  font-size: .84rem;
  font-weight: 700;
  color: var(--c-ink);
}
.page-about .about-team-direction:first-child {
  background: var(--c-primary);
  border-color: var(--c-primary);
  color: #1A1A1A;
  font-weight: 800;
}

/* ============ 06 资质与荣誉 ============ */
.page-about .about-accreditation {
  padding: 96px 0;
  background: radial-gradient(ellipse at 15% 0%, rgba(255, 111, 0, .14) 0%, transparent 42%), var(--c-dark);
  color: var(--c-white);
}
.page-about .about-cred-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 48px;
}
.page-about .about-cred-card {
  padding: 28px 24px;
  background: rgba(244, 241, 234, .05);
  border: 1px solid rgba(255, 255, 255, .1);
  border-top: 4px solid var(--c-primary);
  transition: transform .2s ease, background .2s ease, border-top-color .2s ease;
}
.page-about .about-cred-card:hover {
  transform: translateY(-5px);
  background: rgba(122, 199, 79, .1);
  border-top-color: var(--c-accent);
}
.page-about .about-cred-kicker {
  margin: 0 0 12px;
  font-size: .72rem;
  font-weight: 900;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--c-accent);
}
.page-about .about-cred-card h3 {
  font-family: var(--font-head);
  font-size: 1.16rem;
  line-height: 1.3;
  text-transform: uppercase;
  margin: 0 0 12px;
  color: var(--c-white);
}
.page-about .about-cred-card p:last-child {
  margin: 0;
  font-size: .9rem;
  line-height: 1.72;
  color: rgba(244, 241, 234, .8);
}
.page-about .about-cred-cta {
  margin-top: 44px;
}

/* ============ 桌面端布局增强 ============ */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 56px 0 96px;
  }
  .page-about .about-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.12fr) minmax(340px, .88fr);
    gap: 64px;
    align-items: end;
  }
  .page-about .about-hero-visual {
    margin-top: 0;
    height: auto;
    min-height: 360px;
    clip-path: polygon(0 5%, 100% 0, 100% 100%, 0 92%);
  }
  .page-about .about-origin {
    padding: 112px 0 88px;
  }
  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.6fr);
    gap: 68px;
    align-items: start;
  }
  .page-about .about-origin-head {
    position: sticky;
    top: 130px;
  }
  .page-about .about-origin-stats {
    gap: 20px;
  }
  .page-about .about-timeline {
    padding: 120px 0 104px;
  }
  .page-about .about-timeline-layout {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, .75fr);
    gap: 72px;
    align-items: start;
    margin-top: 56px;
  }
  .page-about .about-timeline-track {
    padding-left: 34px;
  }
  .page-about .about-milestone-card {
    max-width: 640px;
  }
  .page-about .about-timeline-visual {
    max-width: 420px;
  }
  .page-about .about-tech {
    padding: 120px 0;
  }
  .page-about .about-tech-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: 56px;
    align-items: start;
  }
  .page-about .about-tech-wall {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .about-team {
    padding: 120px 0;
  }
  .page-about .about-team-grid {
    grid-template-columns: minmax(0, .7fr) minmax(0, 1.3fr);
    gap: 64px;
    align-items: start;
  }
  .page-about .about-team-directions {
    margin-top: 56px;
  }
  .page-about .about-accreditation {
    padding: 120px 0;
  }
  .page-about .about-cred-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
  .page-about .about-cred-cta {
    margin-top: 56px;
    text-align: right;
  }
}