.page-about {
  background: var(--void);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--white);
}

.page-about p {
  margin: 0 0 14px;
}

.page-about a {
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 20px 0 40px;
  background:
    radial-gradient(circle at 84% 6%, rgba(0, 227, 233, 0.12), transparent 46%),
    radial-gradient(circle at 6% 92%, rgba(255, 106, 26, 0.09), transparent 42%),
    var(--void);
}

.page-about .hero-frame {
  position: relative;
  margin-top: 20px;
  padding: 26px 20px 30px;
  border: 1px solid var(--grid);
  border-radius: var(--radius-card);
  background: linear-gradient(180deg, rgba(10, 21, 38, 0.9), rgba(5, 9, 18, 0.96));
}

.page-about .hero-tick {
  position: absolute;
  width: 18px;
  height: 18px;
  border: 0 solid var(--cyan);
  pointer-events: none;
}

.page-about .hero-tick--tl { top: -1px; left: -1px; border-top-width: 2px; border-left-width: 2px; }
.page-about .hero-tick--tr { top: -1px; right: -1px; border-top-width: 2px; border-right-width: 2px; }
.page-about .hero-tick--bl { bottom: -1px; left: -1px; border-bottom-width: 2px; border-left-width: 2px; }
.page-about .hero-tick--br { bottom: -1px; right: -1px; border-bottom-width: 2px; border-right-width: 2px; }

.page-about .hero-kicker {
  color: var(--cyan);
  letter-spacing: 0.18em;
  font-size: 12px;
  margin: 0 0 14px;
}

.page-about .about-hero h1 {
  font-size: clamp(30px, 7.4vw, 88px);
  max-width: 20ch;
  margin-bottom: 18px;
}

.page-about .hero-lede {
  max-width: 62ch;
  color: var(--mist);
  font-size: 15px;
  margin-bottom: 22px;
}

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

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 26px 0 0;
  padding: 0;
  background: var(--grid);
  border: 1px solid var(--grid);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.page-about .about-stat {
  background: var(--night);
  padding: 14px 16px;
}

.page-about .about-stat__label {
  margin: 0 0 6px;
  color: var(--mist);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.page-about .about-stat__num {
  margin: 0;
  font-size: clamp(22px, 5vw, 32px);
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.page-about .about-stat__num .unit {
  font-size: 13px;
  color: var(--mist);
  margin-left: 4px;
  font-family: var(--font-body);
}

/* ---------- 章节索引 ---------- */

.page-about .about-index {
  position: sticky;
  top: 8px;
  z-index: 20;
  background: linear-gradient(180deg, rgba(5, 9, 18, 0.96), rgba(5, 9, 18, 0.72) 70%, transparent);
  padding: 4px 0 8px;
}

.page-about .about-index-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 6px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index-list::-webkit-scrollbar { display: none; }

.page-about .about-index-link {
  display: inline-block;
  padding: 6px 12px;
  border: 1px solid var(--grid);
  border-radius: var(--radius-capsule);
  color: var(--mist);
  font-size: 12px;
  white-space: nowrap;
  text-decoration: none;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-about .about-index-link:hover,
.page-about .about-index-link:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .about-index-link[aria-current="true"] {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(0, 227, 233, 0.08);
}

/* ---------- 章节通用 ---------- */

.page-about .about-section {
  padding: 44px 0;
}

.page-about .section-head {
  margin-bottom: 26px;
}

.page-about .section-index {
  display: inline-block;
  color: var(--cyan);
  font-size: 12px;
  letter-spacing: 0.2em;
  margin-bottom: 10px;
}

.page-about .section-title {
  font-size: clamp(23px, 4.6vw, 44px);
  margin-bottom: 10px;
  max-width: 24ch;
}

.page-about .section-note {
  margin: 0;
  color: var(--mist);
  font-size: 15px;
  max-width: 60ch;
}

/* ---------- 三条业务线 ---------- */

.page-about .line-list {
  display: grid;
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.page-about .line-item {
  display: grid;
  gap: 14px;
  padding: 24px 20px;
  background: var(--night);
}

.page-about .line-item__key {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .line-item__code {
  color: var(--mist);
  font-size: 12px;
  letter-spacing: 0.14em;
}

.page-about .line-item__body h3 {
  font-size: clamp(19px, 3.2vw, 24px);
  margin-bottom: 10px;
}

.page-about .line-item__body > p {
  color: var(--mist);
  font-size: 15px;
  margin-bottom: 12px;
}

.page-about .line-item__body .list-tick {
  margin: 0 0 14px;
}

.page-about .line-link {
  display: inline-block;
  font-size: 14px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 227, 233, 0.35);
  padding-bottom: 2px;
}

.page-about .line-link:hover,
.page-about .line-link:focus-visible {
  color: var(--cyan-deep);
  border-bottom-color: var(--cyan-deep);
}

/* ---------- 发展历程 ---------- */

.page-about .timeline-grid {
  display: grid;
  gap: 30px;
}

.page-about .timeline-visual .media-frame {
  margin: 0;
}

.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 6px 0 0 26px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--grid) 46%, var(--grid));
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 28px;
}

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

.page-about .tl-dot {
  position: absolute;
  left: -26px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--void);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(0, 227, 233, 0.12);
}

.page-about .tl-year {
  display: block;
  font-size: clamp(26px, 5.4vw, 44px);
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 8px;
  font-variant-numeric: tabular-nums;
}

.page-about .tl-item h3 {
  font-size: clamp(17px, 2.8vw, 21px);
  margin-bottom: 8px;
}

.page-about .tl-item p {
  margin: 0;
  color: var(--mist);
  font-size: 15px;
  max-width: 58ch;
}

/* ---------- 团队 ---------- */

.page-about .team-grid {
  display: grid;
  gap: 28px;
}

.page-about .team-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--grid);
}

.page-about .team-row {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--grid);
}

.page-about .team-num {
  font-size: clamp(26px, 5vw, 34px);
  line-height: 1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .team-body h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.page-about .team-body p {
  margin: 0;
  color: var(--mist);
  font-size: 14px;
}

.page-about .note-card {
  margin: 20px 0 0;
  padding: 16px 18px;
  border: 1px solid var(--grid);
  border-left: 2px solid var(--amber);
  border-radius: var(--radius-panel);
  background: var(--night);
  color: var(--mist);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .team-visual .media-frame {
  margin: 0;
}

/* ---------- 内容来源 ---------- */

.page-about .flow {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .flow-step {
  padding: 20px 18px;
  border: 1px solid var(--grid);
  border-radius: var(--radius-card);
  background: var(--steel);
}

.page-about .flow-num {
  display: inline-block;
  color: var(--cyan);
  font-size: 12px;
  letter-spacing: 0.18em;
  margin-bottom: 10px;
}

.page-about .flow-step h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.page-about .flow-step p {
  margin: 0;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .source-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 24px;
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--grid);
}

.page-about .source-foot p {
  margin: 0;
  flex: 1 1 320px;
  color: var(--mist);
  font-size: 14px;
}

/* ---------- 服务地区 ---------- */

.page-about .reach-grid {
  display: grid;
  gap: 26px;
}

.page-about .reach-visual .media-frame {
  margin: 0;
}

.page-about .reach-copy > p {
  color: var(--mist);
  font-size: 15px;
}

.page-about .reach-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--grid);
  border: 1px solid var(--grid);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.page-about .reach-stats li {
  background: var(--night);
  padding: 14px 16px;
}

.page-about .reach-num {
  display: block;
  color: var(--cyan);
  font-size: clamp(19px, 4vw, 26px);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  margin-bottom: 6px;
}

.page-about .reach-label {
  display: block;
  color: var(--mist);
  font-size: 12px;
  line-height: 1.5;
}

/* ---------- 长期做法 ---------- */

.page-about .practice-grid {
  display: grid;
  gap: 22px;
}

.page-about .practice-card {
  position: relative;
  padding: 22px 20px 24px;
  border: 1px solid var(--grid);
  border-radius: var(--radius-card);
  background: var(--steel);
  box-shadow:
    6px 6px 0 -1px var(--void),
    6px 6px 0 0 var(--grid),
    12px 12px 0 -1px var(--void),
    12px 12px 0 0 var(--grid);
}

.page-about .practice-card h3 {
  font-size: 18px;
  margin: 12px 0 10px;
}

.page-about .practice-card p {
  color: var(--mist);
  font-size: 14px;
  margin-bottom: 14px;
}

.page-about .practice-card .line-link {
  font-size: 13px;
}

/* ---------- 页尾行动 ---------- */

.page-about .about-cta {
  padding: 40px 0 56px;
  background: linear-gradient(180deg, rgba(5, 9, 18, 0) 0%, rgba(10, 21, 38, 0.9) 40%, var(--night) 100%);
}

.page-about .about-cta__title {
  font-size: clamp(21px, 3.8vw, 32px);
  margin-bottom: 22px;
}

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

.page-about .cta-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--grid);
  border-radius: var(--radius-card);
  background: var(--steel);
  color: var(--white);
  font-size: 15px;
  text-decoration: none;
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .cta-link:hover,
.page-about .cta-link:focus-visible {
  border-color: var(--cyan);
  transform: translateX(4px);
}

.page-about .cta-code {
  color: var(--orange);
  font-size: 12px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 28px 0 52px;
  }

  .page-about .hero-frame {
    padding: 40px 38px 44px;
  }

  .page-about .hero-lede {
    font-size: 17px;
  }

  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-section {
    padding: 60px 0;
  }

  .page-about .line-item {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 24px;
    padding: 32px 30px;
  }

  .page-about .line-item__key {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .page-about .flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .flow-step:nth-child(2) {
    margin-top: 30px;
  }

  .page-about .flow-step:nth-child(3) {
    margin-top: 60px;
  }

  .page-about .practice-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }

  .page-about .practice-card:nth-child(2) {
    transform: translateY(18px);
  }

  .page-about .cta-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }
}

@media (min-width: 980px) {
  .page-about .about-index {
    top: 88px;
  }

  .page-about .timeline-grid {
    grid-template-columns: 340px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: 7fr 5fr;
    gap: 46px;
    align-items: start;
  }

  .page-about .reach-grid {
    grid-template-columns: 8fr 4fr;
    gap: 44px;
    align-items: center;
  }

  .page-about .about-cta {
    padding: 52px 0 72px;
  }

  .page-about .cta-links {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .cta-link {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index-link,
  .page-about .cta-link,
  .page-about .line-link {
    transition: none;
  }

  .page-about .cta-link:hover,
  .page-about .cta-link:focus-visible {
    transform: none;
  }

  .page-about .practice-card:nth-child(2) {
    transform: none;
  }
}