.page-about {
  --about-ink: rgba(0, 230, 118, 0.6);
  --about-ink-soft: rgba(0, 230, 118, 0.15);
  --about-ink-faint: rgba(0, 230, 118, 0.06);
  --about-gold-soft: rgba(255, 215, 0, 0.22);
  --about-grid-line: rgba(30, 58, 95, 0.45);
  background: var(--bg-main);
  color: var(--text-light);
  overflow-x: hidden;
}

/* ===== 面包屑 ===== */
.page-about .about-breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.55rem;
  max-width: var(--container);
  margin: 0 auto;
  padding: 1.5rem var(--space-4) 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-dim);
}

.page-about .about-breadcrumb a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.25s ease;
}

.page-about .about-breadcrumb a:hover {
  color: var(--accent-green);
}

.page-about .about-breadcrumb-arrow {
  color: var(--border-color);
}

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

/* ===== 首屏 ===== */
.page-about .about-hero {
  position: relative;
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(3rem, 7vw, 5.5rem) var(--space-4) clamp(3.5rem, 7vw, 5rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 62%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-green), transparent);
  transform: skewX(-32deg);
  opacity: 0.7;
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: stretch;
}

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

.page-about .about-hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  margin: 0 0 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-green);
}

.page-about .about-hero-kicker::before {
  content: "";
  display: inline-block;
  width: 2.2rem;
  height: 2px;
  background: var(--accent-green);
}

.page-about .about-hero h1 {
  margin: 0 0 1.6rem;
  font-family: var(--font-sans);
  font-size: clamp(2.25rem, 5.2vw, 4.4rem);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: 0.01em;
  color: var(--text-white);
  position: relative;
  width: fit-content;
}

.page-about .about-hero h1::after {
  content: "";
  position: absolute;
  right: -1.1rem;
  top: 0.18em;
  width: 0.6rem;
  height: 0.6rem;
  background: var(--accent-gold);
  clip-path: polygon(100% 0, 100% 100%, 0 0);
}

.page-about .about-hero-lead {
  margin: 0 0 1.2rem;
  max-width: 36rem;
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--text-light);
  padding-left: 1.2rem;
  border-left: 3px solid var(--accent-green);
}

.page-about .about-hero-note {
  margin: 0;
  max-width: 36rem;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--text-dim);
  padding-left: 1.2rem;
  border-left: 1px solid var(--border-color);
}

.page-about .about-hero-panel {
  position: relative;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
  padding: 1.6rem 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
  min-height: 230px;
}

.page-about .about-hero-panel-top {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--text-dim);
}

.page-about .about-hero-panel-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-green);
  box-shadow: 0 0 12px var(--accent-green);
  animation: about-pulse 1.8s ease-in-out infinite;
}

@keyframes about-pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.45;
    transform: scale(0.8);
  }
}

.page-about .about-hero-panel-stats {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.page-about .about-hero-panel-stat {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
}

.page-about .about-hero-panel-num {
  font-family: var(--font-mono);
  font-size: 1.9rem;
  font-weight: 800;
  color: var(--text-white);
  line-height: 1;
}

.page-about .about-hero-panel-suffix {
  font-size: 1rem;
  color: var(--accent-green);
  margin-left: 0.15rem;
}

.page-about .about-hero-panel-desc {
  font-size: 0.85rem;
  color: var(--text-dim);
}

.page-about .about-hero-panel-line {
  height: 1px;
  background: linear-gradient(90deg, var(--border-color), var(--accent-gold), transparent);
}

.page-about .about-hero-panel-footer {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  padding-top: 0.5rem;
  border-top: 1px dashed var(--border-color);
}

/* ===== 章节通用 ===== */
.page-about .about-section {
  position: relative;
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(3rem, 6vw, 5rem) var(--space-4);
}

.page-about .about-section + .about-section {
  border-top: 1px solid var(--border-color);
}

.page-about .about-section-head {
  display: flex;
  align-items: baseline;
  gap: 1.1rem;
  margin-bottom: clamp(2rem, 4vw, 3.2rem);
}

.page-about .about-section-index {
  font-family: var(--font-mono);
  font-size: 1.55rem;
  font-weight: 800;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--accent-green);
}

.page-about .about-section-title {
  margin: 0;
  font-family: var(--font-sans);
  font-size: clamp(1.4rem, 2.8vw, 2.15rem);
  font-weight: 800;
  color: var(--text-white);
  letter-spacing: 0.02em;
}

.page-about .about-section-title::after {
  content: "";
  display: inline-block;
  width: 1.5rem;
  height: 3px;
  margin-left: 0.9rem;
  vertical-align: middle;
  background: var(--accent-gold);
}

/* ===== 图片注脚通用 ===== */
.page-about .about-figure-note {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  margin-top: 0.7rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.page-about .about-figure-note::before {
  content: "";
  width: 1.4rem;
  height: 1px;
  background: var(--accent-green);
}

/* ===== 01 品牌使命 ===== */
.page-about .about-mission-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.2rem;
  align-items: center;
}

.page-about .about-mission-copy {
  max-width: 44rem;
}

.page-about .about-mission-p {
  margin: 0 0 1.15rem;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--text-light);
}

.page-about .about-mission-figure {
  margin: 0;
  position: relative;
}

.page-about .about-mission-figure img {
  display: block;
  max-width: 100%;
  height: auto;
  filter: saturate(0.9) contrast(1.1);
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 0 100%);
  border: 1px solid var(--border-color);
}

.page-about .about-mission-figure::after {
  content: "";
  position: absolute;
  right: -8px;
  bottom: -8px;
  width: 56px;
  height: 56px;
  border-right: 2px solid var(--accent-green);
  border-bottom: 2px solid var(--accent-green);
  opacity: 0.7;
}

/* ===== 02 发展里程碑 ===== */
.page-about .about-milestone-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.8rem;
  align-items: start;
}

.page-about .about-timeline {
  position: relative;
  display: flex;
  flex-direction: column;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6.4rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--accent-green), var(--border-color) 55%, transparent);
  opacity: 0.75;
}

.page-about .about-timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 6rem 2.2rem 1fr;
  gap: 0;
  padding-bottom: 2.2rem;
}

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

.page-about .about-timeline-year {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--accent-green);
  line-height: 1.4;
  text-align: right;
  padding-right: 0.6rem;
}

.page-about .about-timeline-bar {
  position: relative;
  display: flex;
  justify-content: center;
}

.page-about .about-timeline-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--accent-green);
  border: 2px solid var(--bg-main);
  box-shadow: 0 0 0 2px var(--accent-green), 0 0 14px var(--accent-green);
  margin-top: 0.35rem;
  z-index: 1;
}

.page-about .about-timeline-content {
  padding-left: 0.2rem;
}

.page-about .about-timeline-content h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-sans);
  font-size: 1.08rem;
  font-weight: 800;
  color: var(--text-white);
}

.page-about .about-timeline-content p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--text-light);
  max-width: 32rem;
}

.page-about .about-milestone-figure {
  margin: 0;
  position: relative;
}

.page-about .about-milestone-figure img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--border-color);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
}

.page-about .about-milestone-figure::before {
  content: "";
  position: absolute;
  top: -10px;
  left: 18px;
  right: 18px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-gold), transparent);
  opacity: 0.7;
}

/* ===== 03 技术实力 ===== */
.page-about .about-tech-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.6rem;
}

.page-about .about-tech-copy {
  max-width: 48rem;
}

.page-about .about-tech-lead {
  margin: 0 0 2rem;
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1.85;
  color: var(--text-white);
  border-left: 3px solid var(--accent-gold);
  padding-left: 1.1rem;
}

.page-about .about-tech-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.page-about .about-tech-list li {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  background: var(--bg-secondary);
  border-left: 2px solid var(--border-color);
  padding: 1rem 1.2rem;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  transition: border-color 0.3s ease, background 0.3s ease;
}

.page-about .about-tech-list li:hover {
  border-left-color: var(--accent-green);
  background: var(--bg-highlight);
}

.page-about .about-tech-tag {
  display: inline-block;
  width: fit-content;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--accent-green);
  text-transform: uppercase;
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--accent-green);
  clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 6px, 100% 100%, 0 100%);
}

.page-about .about-tech-desc {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-light);
}

.page-about .about-tech-figure {
  margin: 0;
}

.page-about .about-tech-figure img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--border-color);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
  background: var(--bg-secondary);
}

/* ===== 04 资质认证 ===== */
.page-about .about-cert-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.4rem;
}

.page-about .about-cert-card {
  position: relative;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 2rem 1.6rem 1.7rem;
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.page-about .about-cert-card:hover {
  background: var(--bg-highlight);
  border-color: rgba(0, 230, 118, 0.4);
}

.page-about .about-cert-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3.4rem;
  height: 3.4rem;
  margin-bottom: 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--bg-main);
  background: var(--accent-green);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
}

.page-about .about-cert-card:nth-child(2) .about-cert-icon {
  background: var(--accent-gold);
}

.page-about .about-cert-card:nth-child(3) .about-cert-icon {
  background: var(--text-light);
}

.page-about .about-cert-card h3 {
  margin: 0 0 0.7rem;
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-white);
  letter-spacing: 0.02em;
}

.page-about .about-cert-card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--text-light);
}

/* ===== 05 团队规模 ===== */
.page-about .about-team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

.page-about .about-team-copy {
  max-width: 48rem;
}

.page-about .about-team-highlight {
  margin: 0 0 1.4rem;
  font-family: var(--font-sans);
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-white);
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.page-about .about-team-highlight-num {
  font-family: var(--font-mono);
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--accent-green);
  text-shadow: 0 0 24px var(--about-ink-soft);
}

.page-about .about-team-p {
  margin: 0 0 1.1rem;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--text-light);
}

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

.page-about .about-metric-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 1.3rem 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  transition: border-color 0.3s ease;
}

.page-about .about-metric-card:hover {
  border-color: var(--accent-green);
}

.page-about .about-metric-num {
  font-family: var(--font-mono);
  font-size: 1.85rem;
  font-weight: 900;
  color: var(--text-white);
  line-height: 1;
}

.page-about .about-metric-card:nth-child(2) .about-metric-num,
.page-about .about-metric-card:nth-child(4) .about-metric-num {
  color: var(--accent-green);
}

.page-about .about-metric-label {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.5;
}

.page-about .about-team-cta {
  margin-top: 3rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
}

.page-about .about-team-cta .btn {
  border-radius: 0;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 700;
  padding: 0.75rem 1.6rem;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
  transition: transform 0.25s ease, background 0.25s ease, color 0.25s ease;
}

.page-about .about-team-cta .btn:hover {
  transform: translateY(-2px);
}

.page-about .about-team-cta .btn-primary {
  background: var(--accent-green);
  color: var(--bg-main);
  border: 2px solid var(--accent-green);
}

.page-about .about-team-cta .btn-primary:hover {
  background: transparent;
  color: var(--accent-green);
}

.page-about .about-team-cta .btn-ghost {
  background: transparent;
  color: var(--accent-green);
  border: 2px solid var(--accent-green);
}

.page-about .about-team-cta .btn-ghost:hover {
  background: var(--accent-green);
  color: var(--bg-main);
}

/* ===== 桌面端断点 ===== */
@media (min-width: 640px) {
  .page-about .about-team-metrics {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: 1.35fr 0.9fr;
    gap: 3rem;
    align-items: stretch;
  }

  .page-about .about-hero-panel {
    margin-top: 1.2rem;
  }

  .page-about .about-mission-grid {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 3.2rem;
  }

  .page-about .about-milestone-layout {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 3.5rem;
  }

  .page-about .about-tech-grid {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
  }

  .page-about .about-cert-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.6rem;
  }

  .page-about .about-team-layout {
    grid-template-columns: 1fr 1fr;
    gap: 3.5rem;
    align-items: center;
  }

  .page-about .about-tech-list li {
    flex-direction: row;
    align-items: baseline;
    gap: 1rem;
  }

  .page-about .about-tech-tag {
    flex-shrink: 0;
    min-width: 6.2rem;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero::after {
    content: "";
    position: absolute;
    right: -4%;
    bottom: 8%;
    width: 220px;
    height: 220px;
    background:
      linear-gradient(135deg, transparent 0 48%, var(--about-grid-line) 49% 50%, transparent 51%),
      linear-gradient(45deg, transparent 0 48%, var(--about-grid-line) 49% 50%, transparent 51%);
    background-size: 34px 34px;
    opacity: 0.4;
    pointer-events: none;
  }

  .page-about .about-section-head {
    padding-left: 1.2rem;
  }
}