.page-about {
  --about-rail: 54px;
  --about-gap: clamp(12px, 2.6vw, 24px);
}

.page-about .about-crumbs-wrap {
  padding: clamp(14px, 3vw, 24px) 0 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 4vw, 48px) 0 clamp(38px, 6vw, 76px);
  border-bottom: 1px solid var(--rail);
  background:
    radial-gradient(130% 100% at 92% 0%, rgba(198, 255, 0, 0.09), transparent 58%),
    repeating-linear-gradient(90deg, rgba(44, 47, 54, 0.5) 0 1px, transparent 1px 88px);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .about-hero-main h1 {
  margin: 10px 0 0;
  font-size: clamp(29px, 7vw, 54px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-hero-main .lede {
  margin: 18px 0 0;
  max-width: 62ch;
  color: var(--steel);
  line-height: 1.85;
}

.page-about .about-hero-actions {
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-pod {
  background: linear-gradient(160deg, var(--panel-2), var(--panel) 72%);
  border: 1px solid var(--rail);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.55);
  padding: clamp(18px, 3vw, 26px);
}

.page-about .about-pod-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.page-about .about-pod-list {
  margin: 16px 0 0;
  padding: 0;
}

.page-about .about-pod-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 14px;
  padding: 11px 0;
  border-top: 1px dashed var(--rail);
}

.page-about .about-pod-item dt {
  font-size: 13px;
  color: var(--steel);
}

.page-about .about-pod-item dd {
  margin: 0;
  font-family: var(--mono);
  font-size: 17px;
  font-weight: 700;
  color: var(--lime);
  white-space: nowrap;
}

/* ---------- 通用标题组 ---------- */
.page-about .section-head {
  max-width: 72ch;
}

.page-about .section-head h2 {
  margin: 8px 0 0;
  font-size: clamp(23px, 4.4vw, 36px);
  line-height: 1.12;
  color: var(--white);
}

.page-about .section-head .lede {
  margin: 14px 0 0;
  color: var(--steel);
  line-height: 1.85;
}

.page-about .eyebrow {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(22px, 3.5vw, 36px) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--rail);
  background: var(--panel);
}

.page-about .about-figure--team {
  max-width: 780px;
}

/* ---------- 起点 ---------- */
.page-about .about-origin-grid {
  margin-top: clamp(24px, 4vw, 44px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 38px);
}

.page-about .about-origin-text p {
  margin: 0 0 16px;
  color: var(--steel);
  line-height: 1.85;
}

.page-about .about-origin-lead {
  color: var(--white) !important;
  font-weight: 500;
}

.page-about .about-inline-link {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-inline-link:hover {
  color: var(--lime-hi);
}

.page-about .about-origin-notes {
  list-style: none;
  margin: 0;
  padding: clamp(14px, 2.4vw, 22px);
  background: var(--panel);
  border: 1px solid var(--rail);
  counter-reset: onote;
}

.page-about .about-origin-notes li {
  counter-increment: onote;
  position: relative;
  padding: 12px 0 12px 42px;
  border-bottom: 1px solid var(--rail);
  color: var(--white);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .about-origin-notes li:last-child {
  border-bottom: 0;
}

.page-about .about-origin-notes li::before {
  content: counter(onote, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 13px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--lime);
}

/* ---------- 团队 ---------- */
.page-about .about-team-list {
  margin-top: clamp(26px, 4vw, 46px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 30px);
}

.page-about .about-team-item {
  padding: 4px 0 4px clamp(14px, 2.4vw, 24px);
  border-left: 2px solid var(--rail);
}

.page-about .about-team-item:nth-child(1) { border-left-color: var(--lime); }
.page-about .about-team-item:nth-child(2) { border-left-color: var(--cyan); }
.page-about .about-team-item:nth-child(3) { border-left-color: var(--purple); }

.page-about .about-team-code {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.page-about .about-team-item h3 {
  margin: 8px 0 10px;
  font-size: clamp(19px, 3vw, 24px);
  color: var(--white);
}

.page-about .about-team-item p {
  margin: 0;
  max-width: 60ch;
  color: var(--steel);
  line-height: 1.85;
}

.page-about .about-team-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team-tags li {
  padding: 3px 9px;
  border: 1px solid var(--rail);
  font-family: var(--mono);
  font-size: 12px;
  color: var(--cyan);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(24px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2.4vw, 22px);
}

.page-about .about-stage {
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-stage--c1 { --stage-accent: var(--lime); }
.page-about .about-stage--c2 { --stage-accent: var(--cyan); }
.page-about .about-stage--c3 { --stage-accent: var(--purple); }
.page-about .about-stage--c4 { --stage-accent: var(--red); }
.page-about .about-stage--c5 { --stage-accent: var(--lime-hi); }

.page-about .about-stage-marker {
  position: relative;
  display: flex;
  justify-content: center;
}

.page-about .about-stage-marker::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 36px;
  bottom: calc(-1 * clamp(14px, 2.4vw, 22px) - 2px);
  width: 2px;
  transform: translateX(-50%);
  background: var(--rail);
}

.page-about .about-stage:last-child .about-stage-marker::before {
  display: none;
}

.page-about .about-stage-idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 34px;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
  background: var(--stage-accent, var(--lime));
}

.page-about .about-stage-body {
  padding: clamp(16px, 2.6vw, 24px);
  background: var(--panel);
  border: 1px solid var(--rail);
  border-left: 3px solid var(--stage-accent, var(--lime));
  transition: background 0.3s ease, border-color 0.3s ease;
}

.page-about .about-stage.is-current .about-stage-body {
  background: var(--panel-2);
  border-color: var(--stage-accent, var(--lime));
}

.page-about .about-stage-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

.page-about .about-stage-body h3 {
  margin: 10px 0 8px;
  font-size: clamp(18px, 2.8vw, 23px);
  color: var(--white);
}

.page-about .about-stage-body p {
  margin: 0;
  color: var(--steel);
  line-height: 1.85;
}

/* ---------- 覆盖场景 ---------- */
.page-about .about-scene-grid {
  margin-top: clamp(24px, 4vw, 42px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
}

.page-about .about-scene-index-title {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.page-about .about-scene-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-scene-index-list a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--rail);
  background: var(--panel);
  color: var(--white);
  font-weight: 700;
  text-decoration: none;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-scene-index-list a span {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--lime);
}

.page-about .about-scene-index-list a:hover,
.page-about .about-scene-index-list a:focus-visible {
  border-color: var(--lime);
  background: var(--panel-2);
}

.page-about .about-scene-panels {
  display: grid;
  gap: clamp(16px, 2.6vw, 24px);
}

.page-about .about-scene {
  scroll-margin-top: 92px;
  padding-top: 16px;
  border-top: 2px solid var(--rail);
}

.page-about .about-scene--cn { border-top-color: var(--lime); }
.page-about .about-scene--desktop { border-top-color: var(--cyan); }
.page-about .about-scene--deep { border-top-color: var(--purple); }

.page-about .about-scene h3 {
  margin: 0 0 10px;
  font-size: clamp(18px, 2.8vw, 23px);
  color: var(--white);
}

.page-about .about-scene p {
  margin: 0;
  color: var(--steel);
  line-height: 1.85;
}

/* ---------- 选择理由 ---------- */
.page-about .about-why-grid {
  margin-top: clamp(24px, 4vw, 42px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 36px);
}

.page-about .about-why-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.6vw, 22px);
  counter-reset: why;
}

.page-about .about-why-list li {
  counter-increment: why;
  display: grid;
  grid-template-columns: 3ch minmax(0, 1fr);
  gap: 14px;
  padding-bottom: clamp(14px, 2.4vw, 20px);
  border-bottom: 1px solid var(--rail);
}

.page-about .about-why-list li::before {
  content: counter(why, decimal-leading-zero);
  padding-top: 3px;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--lime);
}

.page-about .about-why-body h3 {
  margin: 0 0 8px;
  font-size: clamp(17px, 2.5vw, 21px);
  color: var(--white);
}

.page-about .about-why-body p {
  margin: 0;
  color: var(--steel);
  line-height: 1.82;
}

.page-about .about-faq {
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-faq details {
  padding: 14px 16px;
  border: 1px solid var(--rail);
  background: var(--panel);
  transition: border-color 0.2s ease;
}

.page-about .about-faq details[open] {
  border-color: var(--lime);
}

.page-about .about-faq summary {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  list-style: none;
  cursor: pointer;
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-faq summary::-webkit-details-marker {
  display: none;
}

.page-about .about-faq summary::before {
  content: "+";
  font-family: var(--mono);
  color: var(--lime);
}

.page-about .about-faq details[open] summary::before {
  content: "–";
}

.page-about .about-faq details p {
  margin: 12px 0 0;
  font-size: 14px;
  color: var(--steel);
  line-height: 1.8;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta-inner {
  padding: clamp(24px, 4vw, 46px);
  border: 2px solid var(--lime);
  background:
    linear-gradient(135deg, rgba(198, 255, 0, 0.09), transparent 58%),
    var(--panel);
}

.page-about .about-cta-inner h2 {
  margin: 10px 0 0;
  font-size: clamp(22px, 3.8vw, 32px);
  line-height: 1.15;
  color: var(--white);
}

.page-about .about-cta-inner p {
  margin: 14px 0 0;
  max-width: 62ch;
  color: var(--steel);
  line-height: 1.82;
}

.page-about .about-cta-inner .btn-row {
  margin-top: clamp(20px, 3vw, 28px);
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 860px) {
  .page-about {
    --about-rail: 82px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(300px, 0.78fr);
    gap: clamp(30px, 4vw, 62px);
  }

  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  }

  .page-about .about-team-list {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .about-team-item:nth-child(1) {
    grid-column: 1 / span 3;
  }

  .page-about .about-team-item:nth-child(2) {
    grid-column: 4 / span 3;
    margin-top: 46px;
  }

  .page-about .about-team-item:nth-child(3) {
    grid-column: 2 / span 3;
  }

  .page-about .about-scene-grid {
    grid-template-columns: minmax(220px, 280px) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 52px);
  }

  .page-about .about-why-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.85fr);
    gap: clamp(30px, 4vw, 56px);
  }
}