.page-about {
  --about-rail: 104px;
  --about-pad: 18px;
  display: block;
  padding-bottom: 12px;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about .breadcrumbs {
  padding: 16px 0 0;
  font-size: 12px;
  letter-spacing: 0.06em;
}

/* ---------- 首屏封面 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: 12px;
  padding: 22px 0 26px;
  border-bottom: 1px solid var(--line-strong);
  background:
    radial-gradient(circle at 88% 8%, rgba(70, 224, 210, 0.16), transparent 56%),
    radial-gradient(circle at 4% 96%, rgba(185, 111, 86, 0.16), transparent 52%);
}

.page-about .about-hero__kicker {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 8.2vw, 3.5rem);
  line-height: 1.04;
  letter-spacing: 0.01em;
  color: var(--paper);
  max-width: 22ch;
}

.page-about .about-hero__hl {
  font-style: normal;
  color: var(--cyan);
  border-bottom: 3px solid var(--signal);
  padding-bottom: 2px;
}

.page-about .about-hero__lede {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .stat-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 22px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .stat {
  min-width: 0;
  padding: 12px 12px 13px;
  background: var(--ink-800);
}

.page-about .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 19px;
  line-height: 1.2;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .stat__label {
  display: block;
  margin-top: 4px;
  font-size: 11.5px;
  line-height: 1.5;
  color: var(--stone);
}

/* ---------- 章节索引 ---------- */
.page-about .chapter-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.page-about .chapter-index a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 10px;
  font-size: 12px;
  color: var(--mist);
  text-decoration: none;
  background: rgba(15, 36, 64, 0.72);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, color 0.18s ease, transform 0.18s ease;
}

.page-about .chapter-index a .idx {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--cyan-deep);
}

.page-about .chapter-index a:hover,
.page-about .chapter-index a:focus-visible {
  transform: translateY(-2px);
  border-color: var(--cyan);
  color: var(--paper);
}

.page-about .chapter-index a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 堆叠画板 ---------- */
.page-about .about-stack {
  display: grid;
  gap: 18px;
  padding-top: 20px;
}

.page-about .chapter {
  position: relative;
  display: grid;
  gap: 6px;
  min-width: 0;
  padding: var(--about-pad) 16px calc(var(--about-pad) + 2px);
  background: var(--ink-700);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-stack);
}

.page-about .chapter__rail {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.page-about .chapter__num {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1;
  letter-spacing: 0.08em;
  color: var(--cyan);
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line-strong);
}

.page-about .chapter__tag {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--stone);
}

.page-about .chapter__body {
  min-width: 0;
}

.page-about .chapter .section-title {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.35rem, 5.4vw, 1.95rem);
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .chapter__body > p {
  margin: 10px 0 0;
  max-width: 66ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .chapter__link {
  margin-top: 18px;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 20px 0 0;
}

.page-about .about-figure img,
.page-about .reach-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .img-frame__caption {
  display: block;
  margin-top: 8px;
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--stone);
  letter-spacing: 0.02em;
}

/* ---------- 团队三栏 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 14px;
  margin-top: 16px;
}

.page-about .team-card {
  position: relative;
  min-width: 0;
  padding: 15px 14px 17px;
  background: linear-gradient(180deg, rgba(22, 54, 90, 0.96), rgba(15, 36, 64, 0.96));
  border: 1px solid var(--line);
  border-top: 3px solid var(--cyan);
  border-radius: var(--radius);
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}

.page-about .team-card:nth-child(2) {
  border-top-color: var(--moss);
}

.page-about .team-card:nth-child(3) {
  border-top-color: var(--clay);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  box-shadow: 0 8px 0 rgba(5, 11, 20, 0.36);
}

.page-about .team-card__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.2em;
  color: var(--stone);
}

.page-about .team-card__name {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.3;
  color: var(--paper);
  letter-spacing: 0.02em;
}

.page-about .team-list {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
}

.page-about .team-list li {
  position: relative;
  margin-top: 8px;
  padding-left: 14px;
  font-size: 13px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .team-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 流程三步 ---------- */
.page-about .steps {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .step {
  min-width: 0;
  padding: 2px 0 2px 14px;
  border-left: 2px solid var(--cyan-deep);
}

.page-about .step__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .step__title {
  margin: 5px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--paper);
  letter-spacing: 0.03em;
}

.page-about .step__text {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

/* ---------- 跨端对照 ---------- */
.page-about .cross {
  display: grid;
  gap: 14px;
  margin-top: 16px;
}

.page-about .cross__block {
  min-width: 0;
  padding: 16px 14px 18px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .cross__block--z9ed {
  background:
    linear-gradient(150deg, rgba(70, 224, 210, 0.12), transparent 62%),
    var(--ink-800);
  border-color: rgba(70, 224, 210, 0.34);
}

.page-about .cross__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .cross__block--z9ed .cross__eyebrow {
  color: var(--signal);
}

.page-about .cross__name {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.25;
  color: var(--paper);
}

.page-about .cross__text {
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 发展时间轴 ---------- */
.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--cyan-deep) 55%, var(--signal));
}

.page-about .stage {
  position: relative;
  min-width: 0;
  margin-left: 20px;
  padding: 12px 13px 14px;
  background: var(--ink-600);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .stage:hover {
  border-color: rgba(70, 224, 210, 0.55);
  transform: translateY(-2px);
}

.page-about .stage:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

.page-about .stage__dot {
  position: absolute;
  left: -20px;
  top: 16px;
  width: 10px;
  height: 10px;
  background: var(--ink-900);
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
}

.page-about .stage__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan-deep);
}

.page-about .stage__name {
  margin: 5px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--paper);
  letter-spacing: 0.03em;
}

.page-about .stage__text {
  margin: 6px 0 0;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 服务范围 ---------- */
.page-about .reach-grid {
  display: grid;
  gap: 16px;
  margin-top: 18px;
}

.page-about .reach-figure {
  margin: 0;
  min-width: 0;
}

.page-about .reach-svg {
  display: block;
  width: 100%;
  height: auto;
  background: rgba(8, 20, 38, 0.78);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .reach-side {
  min-width: 0;
  padding: 15px 14px 17px;
  background: linear-gradient(180deg, rgba(22, 54, 90, 0.9), rgba(8, 20, 38, 0.9));
  border: 1px solid var(--line);
  border-left: 3px solid var(--clay);
  border-radius: var(--radius);
}

.page-about .reach-side__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--paper);
  letter-spacing: 0.03em;
}

.page-about .flow {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow__step {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 5px 9px;
  font-size: 12px;
  color: var(--mist);
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
}

.page-about .flow__num {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--cyan);
}

.page-about .reach-side__note {
  margin: 12px 0 14px;
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 资质与积累 ---------- */
.page-about .cred-list {
  display: grid;
  gap: 12px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .cred {
  min-width: 0;
  padding: 13px 13px 14px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-bottom: 2px solid var(--cyan-deep);
  border-radius: var(--radius);
}

.page-about .cred__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--cyan);
  word-break: break-word;
}

.page-about .cred__text {
  margin: 7px 0 0;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 16px;
  padding: 22px 18px 24px;
  background:
    linear-gradient(135deg, rgba(255, 90, 54, 0.16), rgba(70, 224, 210, 0.12) 68%),
    var(--ink-800);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  box-shadow: var(--shadow-stack);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.3rem, 5.2vw, 1.8rem);
  line-height: 1.22;
  color: var(--paper);
}

.page-about .about-cta__lede {
  margin: 8px 0 0;
  max-width: 56ch;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 640px) {
  .page-about .stat-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-cta__actions {
    gap: 10px;
  }
}

@media (min-width: 760px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .team-card:nth-child(2) {
    margin-top: 20px;
  }

  .page-about .team-card:nth-child(3) {
    margin-top: 40px;
  }

  .page-about .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
  }

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

@media (min-width: 860px) {
  .page-about {
    --about-rail: 118px;
    --about-pad: 28px;
  }

  .page-about .about-hero {
    margin-top: 16px;
    padding: 32px 0 34px;
  }

  .page-about .about-hero__lede {
    font-size: 15.5px;
  }

  .page-about .chapter-index {
    gap: 10px;
    margin-top: 22px;
  }

  .page-about .about-stack {
    gap: 22px;
    padding-top: 24px;
  }

  .page-about .chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 26px;
    padding: var(--about-pad) 30px calc(var(--about-pad) + 4px);
  }

  .page-about .chapter__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding-top: 4px;
  }

  .page-about .chapter__num {
    font-size: 32px;
    line-height: 1;
    padding-bottom: 0;
    border-bottom: 0;
  }

  .page-about .chapter__tag {
    writing-mode: vertical-rl;
    letter-spacing: 0.3em;
    font-size: 9px;
    color: var(--stone);
  }

  .page-about .cross {
    grid-template-columns: 1.08fr 0.92fr;
    align-items: start;
    gap: 16px;
  }

  .page-about .cross__block + .cross__block {
    margin-top: 26px;
  }

  .page-about .timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
    margin-top: 26px;
    padding-top: 6px;
  }

  .page-about .timeline::before {
    left: 0;
    right: 0;
    top: 0;
    bottom: auto;
    width: auto;
    height: 2px;
    background: linear-gradient(90deg, var(--cyan), var(--cyan-deep) 55%, var(--signal));
  }

  .page-about .stage {
    margin-left: 0;
    padding: 16px 13px 16px;
  }

  .page-about .stage__dot {
    left: 0;
    top: -11px;
    width: 10px;
    height: 10px;
  }

  .page-about .reach-grid {
    grid-template-columns: 1.04fr 0.96fr;
    align-items: start;
    gap: 18px;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 22px;
    padding: 26px 28px 28px;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
    max-width: 300px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero__title {
    max-width: 26ch;
  }

  .page-about .chapter {
    gap: 34px;
  }

  .page-about .team-card {
    padding: 18px 16px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .chapter-index a,
  .page-about .team-card,
  .page-about .stage {
    transition: none;
  }

  .page-about .chapter-index a:hover,
  .page-about .team-card:hover,
  .page-about .stage:hover {
    transform: none;
  }
}