.page-about {
  --about-panel: var(--ink-800);
  --about-panel-soft: rgba(18, 59, 49, 0.55);
  --about-hair: rgba(29, 74, 63, 0.9);
  --about-line: rgba(53, 242, 200, 0.22);
  --about-glow: rgba(53, 242, 200, 0.1);
  --about-pad: clamp(16px, 3vw, 30px);
  --about-cut: 26px;

  background:
    radial-gradient(120% 70% at 88% -8%, rgba(53, 242, 200, 0.1), transparent 62%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-900) 58%, var(--ink-800) 100%);
  color: var(--text);
  font-family: var(--font-body);
  padding-block: 0 clamp(56px, 9vw, 118px);
  overflow-x: clip;
}

.page-about .breadcrumb {
  padding-top: clamp(12px, 2vw, 20px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  padding-block: clamp(20px, 3.4vw, 44px) clamp(38px, 6vw, 76px);
  align-items: end;
}

.page-about .about-eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-hero h1 {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(36px, 6.6vw, 82px);
  line-height: 1.02;
  letter-spacing: 0.02em;
  color: var(--cyan-soft);
  text-wrap: balance;
}

.page-about .about-hero .lede {
  max-width: 60ch;
  margin: 0;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 40px) 0 0;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .about-metrics > div {
  background: var(--ink-900);
  padding: 14px 16px 16px;
}

.page-about .about-metrics dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin: 0 0 8px;
}

.page-about .about-metrics dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.page-about .metric-num {
  font-family: var(--font-data);
  font-size: clamp(24px, 3.4vw, 32px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .metric-unit {
  font-size: 12px;
  color: var(--muted);
}

.page-about .about-hero-visual {
  position: relative;
  margin: 0;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--ink-700);
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-hero-visual img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.05);
}

.page-about .about-hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(90deg, rgba(53, 242, 200, 0.09) 0 1px, transparent 1px 46px),
    linear-gradient(200deg, transparent 40%, rgba(6, 26, 21, 0.85) 100%);
  pointer-events: none;
}

/* ---------- 通用章节 ---------- */

.page-about .section {
  padding-block: clamp(38px, 6vw, 76px);
  border-top: 1px solid var(--about-hair);
}

.page-about .chapter {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 0 16px;
  margin-bottom: 18px;
}

.page-about .chapter-index {
  grid-row: span 2;
  font-family: var(--font-data);
  font-size: clamp(40px, 7vw, 76px);
  line-height: 0.9;
  color: transparent;
  -webkit-text-stroke: 1px var(--ink-600);
}

.page-about .chapter-kicker {
  margin: 0 0 6px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--amber);
  text-transform: uppercase;
}

.page-about .chapter-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(24px, 3.6vw, 42px);
  line-height: 1.14;
  letter-spacing: 0.01em;
  color: var(--cyan-soft);
  text-wrap: balance;
}

.page-about .about-lede {
  max-width: 64ch;
  margin: 0 0 clamp(24px, 4vw, 40px);
}

/* ---------- 时间线 ---------- */

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

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 18px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(53, 242, 200, 0.35) 55%, rgba(53, 242, 200, 0.03) 100%);
}

.page-about .timeline-item {
  position: relative;
  padding: 0 0 clamp(24px, 4vw, 38px) clamp(38px, 5vw, 62px);
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 242, 200, 0.12);
}

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

.page-about .timeline-year {
  margin: 0 0 10px;
  font-family: var(--font-data);
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1;
  color: var(--amber);
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .timeline-tag {
  font-size: 11px;
  letter-spacing: 0.14em;
  padding: 3px 8px;
  color: var(--cyan);
  border: 1px solid var(--about-line);
  background: rgba(53, 242, 200, 0.07);
}

.page-about .timeline-title {
  margin: 0 0 8px;
  font-size: clamp(17px, 1.5vw, 20px);
  font-weight: 600;
  color: var(--text);
}

.page-about .timeline-text {
  margin: 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 服务范围 ---------- */

.page-about .about-scope .segment {
  margin-bottom: clamp(22px, 3.4vw, 34px);
}

.page-about .about-scope .segment-panel h3 {
  margin: 0 0 16px;
  font-size: clamp(17px, 1.6vw, 21px);
  font-weight: 600;
  color: var(--cyan-soft);
}

.page-about .scope-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .scope-list li {
  position: relative;
  padding: 14px 16px 14px 34px;
  background: var(--about-panel-soft);
  border-left: 2px solid var(--about-line);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .scope-list li::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 22px;
  width: 7px;
  height: 7px;
  background: var(--cyan);
  transform: rotate(45deg);
}

.page-about .scope-list strong {
  color: var(--text);
  font-weight: 600;
  margin-right: 4px;
}

.page-about .scope-strip {
  list-style: none;
  margin: 0;
  padding: 0 0 14px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(196px, 1fr);
  gap: 10px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  border-top: 1px dashed var(--about-line);
  padding-top: 18px;
  margin-top: 8px;
}

.page-about .scope-strip li {
  scroll-snap-align: start;
  display: grid;
  gap: 6px;
  padding: 14px 16px;
  background: linear-gradient(160deg, rgba(11, 59, 70, 0.55), rgba(10, 36, 30, 0.7));
  border: 1px solid var(--about-hair);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

.page-about .scope-strip-idx {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .scope-strip strong {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.page-about .scope-strip span:last-child {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 更新节奏 ---------- */

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

.page-about .rhythm-card {
  position: relative;
  padding: var(--about-pad);
  background: var(--about-panel-soft);
  border: 1px solid var(--about-hair);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

.page-about .rhythm-num {
  margin: 0 0 12px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
  text-transform: uppercase;
}

.page-about .rhythm-card h3 {
  margin: 0 0 10px;
  font-size: clamp(17px, 1.6vw, 20px);
  font-weight: 600;
  color: var(--text);
}

.page-about .rhythm-card p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 团队 ---------- */

.page-about .about-team-grid {
  align-items: start;
}

.page-about .team-quad {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .team-card {
  position: relative;
  padding: 18px 18px 18px 22px;
  background: var(--ink-900);
  border: 1px solid var(--about-hair);
  transition: border-color 0.32s var(--ease), background 0.32s var(--ease), transform 0.32s var(--ease);
}

.page-about .team-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--about-line);
  transition: background 0.32s var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  border-color: var(--about-line);
  background: var(--about-panel-soft);
  transform: translateX(4px);
}

.page-about .team-card:hover::before,
.page-about .team-card:focus-within::before {
  background: var(--cyan);
}

.page-about .team-idx {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .team-card h3 {
  margin: 6px 0 10px;
  font-size: 17px;
  font-weight: 600;
  color: var(--cyan-soft);
}

.page-about .team-card p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .team-card .team-meta {
  margin: 0;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: rgba(143, 184, 173, 0.75);
}

.page-about .about-team-visual {
  margin: 0;
  position: relative;
  border: 1px solid var(--about-hair);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
  background: var(--ink-900);
  overflow: hidden;
}

.page-about .about-team-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  filter: saturate(0.8);
}

.page-about .about-team-visual figcaption {
  padding: 12px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
  border-top: 1px solid var(--about-hair);
}

/* ---------- 昆明节点 ---------- */

.page-about .node-layout {
  display: grid;
  gap: clamp(20px, 3.4vw, 40px);
  align-items: start;
}

.page-about .node-copy .lede {
  max-width: 60ch;
  margin: 0 0 20px;
}

.page-about .node-list {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .node-list li {
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
  padding-left: 18px;
  position: relative;
}

.page-about .node-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 8px;
  height: 1px;
  background: var(--cyan);
}

.page-about .node-list strong {
  color: var(--text);
  font-weight: 600;
  margin-right: 4px;
}

.page-about .node-visual {
  margin: 0;
  border: 1px solid var(--about-line);
  background: var(--deep-blue);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .node-visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  opacity: 0.92;
}

/* ---------- 长期使用 ---------- */

.page-about .why-grid {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-about .why-card {
  padding: 18px;
  border-top: 2px solid var(--about-hair);
  background: linear-gradient(180deg, rgba(11, 59, 70, 0.32), transparent);
  transition: border-color 0.3s var(--ease);
}

.page-about .why-card:hover {
  border-top-color: var(--amber);
}

.page-about .why-card h3 {
  margin: 0 0 10px;
  font-size: 16.5px;
  font-weight: 600;
  color: var(--cyan-soft);
}

.page-about .why-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--muted);
}

.page-about .about-cta {
  display: grid;
  gap: 18px;
  padding: clamp(20px, 3.4vw, 34px);
  background:
    linear-gradient(120deg, rgba(53, 242, 200, 0.12), rgba(255, 178, 77, 0.08) 70%, transparent);
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
}

.page-about .about-cta h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.16;
  color: var(--cyan-soft);
}

.page-about .about-cta p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 56ch;
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .rhythm-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .why-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .team-quad {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-hero-visual {
    aspect-ratio: 5 / 6;
  }

  .page-about .rhythm-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .rhythm-grid .rhythm-card:nth-child(2) {
    margin-top: 28px;
  }

  .page-about .rhythm-grid .rhythm-card:nth-child(3) {
    margin-top: 14px;
  }

  .page-about .node-layout {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .about-cta-actions {
    justify-content: flex-end;
  }

  .page-about .scope-strip {
    grid-auto-columns: auto;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    overflow-x: visible;
  }
}

@media (min-width: 1080px) {
  .page-about .timeline-item {
    padding-bottom: clamp(30px, 3.4vw, 46px);
  }

  .page-about .about-hero .lede {
    font-size: 16.5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .team-card::before,
  .page-about .why-card {
    transition: none;
  }

  .page-about .team-card:hover,
  .page-about .team-card:focus-within {
    transform: none;
  }
}