.page-about {
  --page-orange: #FF6B00;
  --page-cyan: #00D1FF;
  --page-green: #39FF14;
  --page-panel: #111827;
  --page-line: #1E2A38;
  --page-text-sub: #A0B0C0;
}

/* ===== 页面区块通用 ===== */
.page-about .section-head {
  margin-bottom: 36px;
}

.page-about .section-head h2 {
  margin-top: 12px;
  font-family: var(--font-head);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.page-about .inline-head {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .section-note {
  color: var(--page-text-sub);
  font-size: 0.9375rem;
  line-height: 1.7;
  max-width: 42ch;
}

/* ===== 首屏 Hero ===== */
.page-about .about-hero {
  position: relative;
  padding: 48px 0 64px;
  background:
    radial-gradient(ellipse 55% 45% at 88% 8%, rgba(0, 209, 255, 0.1), transparent 60%),
    linear-gradient(180deg, #0A0E17 0%, #0D1420 100%);
  border-bottom: 1px solid var(--page-line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 12%;
  left: -80px;
  width: 220px;
  height: 2px;
  background: linear-gradient(90deg, rgba(255, 107, 0, 0.6), transparent);
  transform: skewX(-22deg);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -1px;
  width: 46%;
  height: 2px;
  background: linear-gradient(90deg, var(--page-cyan), var(--page-green));
  transform: skewX(-45deg);
  transform-origin: right;
}

.page-about .about-hero-grid {
  display: grid;
  gap: 44px;
  margin-top: 36px;
}

.page-about .about-hero-copy {
  max-width: 46rem;
}

.page-about .about-hero-copy h1 {
  margin: 14px 0 18px;
  font-family: var(--font-head);
  font-size: clamp(2rem, 5.6vw, 3.25rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.18;
}

.page-about .about-hero-lead {
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--page-text-sub);
  max-width: 56ch;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* hero 数据面板 */
.page-about .about-hero-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  align-self: start;
}

.page-about .hero-meta-item {
  background: rgba(17, 24, 39, 0.86);
  border: 1px solid rgba(0, 209, 255, 0.16);
  padding: 18px 14px;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
}

.page-about .hero-meta-item:first-child {
  border-top: 2px solid var(--page-cyan);
}

.page-about .hero-meta-item:nth-child(2) {
  border-top: 2px solid var(--page-green);
}

.page-about .hero-meta-item:nth-child(3) {
  border-top: 2px solid var(--page-orange);
}

.page-about .hero-meta-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  font-weight: 700;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  color: #FFFFFF;
}

.page-about .hero-meta-label {
  display: block;
  margin-top: 6px;
  font-size: 0.8125rem;
  color: var(--page-text-sub);
}

/* ===== 品牌起源 ===== */
.page-about .about-origin {
  padding: 72px 0 64px;
}

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

.page-about .origin-copy h2 {
  margin: 12px 0 20px;
  font-family: var(--font-head);
  font-size: clamp(1.75rem, 4vw, 2.375rem);
  font-weight: 900;
  letter-spacing: -0.02em;
}

.page-about .origin-copy p {
  color: var(--page-text-sub);
  line-height: 1.85;
  margin-bottom: 1rem;
}

.page-about .origin-evidence {
  align-self: start;
  color: var(--page-text-sub);
  border: 1px solid var(--page-line);
  background: linear-gradient(135deg, rgba(17, 24, 39, 1) 0%, rgba(10, 14, 23, 1) 100%);
}

.page-about .origin-evidence blockquote {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.0625rem;
  color: #FFFFFF;
  line-height: 1.6;
  margin: 14px 0 18px;
  padding-left: 16px;
  border-left: 3px solid var(--page-orange);
}

.page-about .evidence-note {
  font-size: 0.875rem;
  border-top: 1px solid var(--page-line);
  padding-top: 14px;
  margin-bottom: 0;
}

/* ===== 大事记 ===== */
.page-about .about-milestones {
  padding: 72px 0 64px;
  background: var(--page-panel);
  border-top: 1px solid var(--page-line);
  border-bottom: 1px solid var(--page-line);
}

.page-about .milestone-figure {
  margin: 0 0 52px;
}

.page-about .milestone-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--page-line);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
}

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

.page-about .timeline-item {
  position: relative;
  padding-left: 32px;
  padding-bottom: 36px;
}

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

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 32px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, rgba(0, 209, 255, 0.6), rgba(0, 209, 255, 0.1));
}

.page-about .timeline-item:last-child::before {
  display: none;
}

.page-about .timeline-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--page-cyan);
  background: rgba(0, 209, 255, 0.08);
  border: 1px solid rgba(0, 209, 255, 0.22);
  padding: 3px 12px;
  margin-bottom: 10px;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
}

.page-about .timeline-marker {
  position: absolute;
  left: 0;
  top: 4px;
  width: 16px;
  height: 16px;
  background: var(--page-cyan);
  border: 3px solid var(--page-panel);
  box-shadow: 0 0 0 2px rgba(0, 209, 255, 0.55);
  transform: rotate(45deg);
}

.page-about .timeline-item:hover .timeline-year {
  color: #FFFFFF;
  background: rgba(0, 209, 255, 0.18);
  border-color: var(--page-cyan);
}

.page-about .timeline-content strong {
  display: block;
  font-family: var(--font-head);
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.page-about .timeline-content p {
  color: var(--page-text-sub);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-bottom: 0;
}

/* ===== 服务能力 ===== */
.page-about .about-capability {
  padding: 72px 0 64px;
}

.page-about .capability-dashboard {
  background: linear-gradient(135deg, rgba(0, 209, 255, 0.05), rgba(17, 24, 39, 0.9));
  border: 1px solid var(--page-line);
  border-left: 3px solid var(--page-cyan);
  padding: 28px 24px;
  margin-bottom: 48px;
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

.page-about .dashboard-stats {
  display: grid;
  gap: 36px;
  margin: 0;
}

.page-about .dash-stat dt {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--page-cyan);
  letter-spacing: 0.06em;
  margin-bottom: 10px;
}

.page-about .dash-stat dd {
  margin: 0;
}

.page-about .dash-num {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 6vw, 3.375rem);
  font-weight: 700;
  line-height: 1.1;
  color: #FFFFFF;
  font-variant-numeric: tabular-nums;
}

.page-about .dash-unit {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--page-text-sub);
  margin-left: 4px;
}

.page-about .dash-desc {
  color: var(--page-text-sub);
  font-size: 0.875rem;
  margin-top: 8px !important;
}

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

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

.page-about .capability-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--page-line);
  box-shadow: 0 24px 60px -30px rgba(0, 209, 255, 0.25);
}

.page-about .capability-list h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0 0 16px;
}

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

.page-about .capability-list li {
  position: relative;
  color: var(--page-text-sub);
  line-height: 1.7;
  padding-left: 20px;
  margin-bottom: 12px;
}

.page-about .capability-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  background: var(--page-orange);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
  transform: rotate(45deg);
}

/* ===== 术语表 ===== */
.page-about .about-terms {
  padding: 72px 0 64px;
  border-top: 1px solid var(--page-line);
  background: linear-gradient(180deg, #0A0E17 0%, #0E1623 100%);
}

.page-about .glossary-grid {
  display: grid;
  gap: 16px;
  margin: 0;
}

.page-about .glossary-item {
  background: rgba(17, 24, 39, 0.75);
  border: 1px solid var(--page-line);
  padding: 20px 24px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .glossary-item:hover {
  border-color: rgba(0, 209, 255, 0.45);
  transform: translateX(4px);
}

.page-about .glossary-item dt {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.0625rem;
  color: #FFFFFF;
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 8px;
}

.page-about .glossary-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--page-cyan);
}

.page-about .glossary-item dd {
  margin: 0;
  color: var(--page-text-sub);
  font-size: 0.9375rem;
  line-height: 1.7;
}

/* ===== 团队与资质 ===== */
.page-about .about-team {
  padding: 72px 0 64px;
}

.page-about .team-layout {
  display: grid;
  gap: 36px;
  margin-bottom: 40px;
}

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

.page-about .team-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--page-line);
  filter: saturate(1.1);
}

.page-about .team-content {
  align-self: center;
}

.page-about .team-stat-card {
  padding: 28px;
  border: 1px solid var(--page-line);
  background: linear-gradient(135deg, rgba(0, 209, 255, 0.06), rgba(17, 24, 39, 0.9));
  color: var(--page-text-sub);
}

.page-about .team-stat-card p {
  margin-bottom: 14px;
  line-height: 1.7;
}

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

.page-about .team-stat-card .dash-num {
  color: var(--page-cyan);
  font-size: 1.75rem;
  margin-right: 4px;
}

.page-about .credential-row {
  display: grid;
  gap: 16px;
}

.page-about .credential-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: rgba(17, 24, 39, 0.75);
  border: 1px solid var(--page-line);
  border-left: 3px solid var(--page-green);
  padding: 20px 24px;
}

.page-about .credential-card:nth-child(2) {
  border-left-color: var(--page-cyan);
}

.page-about .credential-card:nth-child(3) {
  border-left-color: var(--page-orange);
}

.page-about .credential-icon {
  font-size: 1.25rem;
  line-height: 1;
  color: var(--page-green);
}

.page-about .credential-card strong {
  display: block;
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 4px;
}

.page-about .credential-card p {
  margin: 0;
  color: var(--page-text-sub);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* ===== 延伸阅读 ===== */
.page-about .about-extended {
  padding: 72px 0 64px;
  border-top: 1px solid var(--page-line);
  background: var(--page-panel);
}

.page-about .extended-grid {
  display: grid;
  gap: 14px;
}

.page-about .extended-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 22px;
  background: rgba(10, 14, 23, 0.5);
  border: 1px solid var(--page-line);
  color: #FFFFFF;
  text-decoration: none;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about .extended-card:hover {
  border-color: rgba(0, 209, 255, 0.5);
  background: rgba(10, 14, 23, 0.8);
}

.page-about .extended-index {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--page-cyan);
}

.page-about .extended-title {
  font-weight: 500;
  font-size: 0.9375rem;
  color: var(--page-text-sub);
}

.page-about .extended-card:hover .extended-title {
  color: #FFFFFF;
}

/* ===== 平板与桌面端 ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 64px 0 80px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: 1.7fr 1fr;
    align-items: center;
    gap: 48px;
  }

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

  .page-about .about-origin-layout {
    grid-template-columns: 3fr 2fr;
    gap: 56px;
  }

  /* 水平时间轴 */
  .page-about .timeline-list {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
    position: relative;
  }

  .page-about .timeline-list::before {
    content: "";
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, rgba(0, 209, 255, 0.15), var(--page-cyan) 50%, rgba(0, 209, 255, 0.15));
  }

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

  .page-about .timeline-item::before {
    display: none;
  }

  .page-about .timeline-year {
    position: absolute;
    top: 0;
    left: 12px;
    margin-bottom: 0;
  }

  .page-about .timeline-marker {
    left: 20px;
    top: 52px;
  }

  .page-about .timeline-content {
    margin-top: 76px;
    padding: 0 12px;
  }

  .page-about .capability-dashboard {
    padding: 40px 36px;
  }

  .page-about .dashboard-stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
  }

  .page-about .capability-detail {
    grid-template-columns: 1.2fr 1fr;
    align-items: center;
    gap: 48px;
  }

  .page-about .glossary-grid {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  .page-about .team-layout {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
  }

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

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