.page-about {
  --about-rail-width: 180px;
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-section {
  scroll-margin-top: 92px;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: 24px 0 52px;
  color: var(--text-hi);
  background:
    radial-gradient(120% 88% at 88% -12%, rgba(122, 60, 255, 0.38), rgba(7, 26, 47, 0) 58%),
    radial-gradient(85% 62% at 4% 106%, rgba(38, 224, 208, 0.18), rgba(7, 26, 47, 0) 64%),
    var(--ink-deep);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(38, 224, 208, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(38, 224, 208, 0.08) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(82% 72% at 68% 24%, #000 0%, transparent 78%);
  mask-image: radial-gradient(82% 72% at 68% 24%, #000 0%, transparent 78%);
}

.page-about .breadcrumbs-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .breadcrumbs-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-hero-grid {
  display: grid;
  gap: 28px;
  margin-top: 26px;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.6vw, 60px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text-hi);
}

.page-about .about-hero-lead {
  margin: 20px 0 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-mid);
}

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

.page-about .about-hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid rgba(38, 224, 208, 0.28);
  border-radius: var(--radius-m);
  background: rgba(38, 224, 208, 0.26);
}

.page-about .about-fact {
  padding: 16px 14px;
  background: rgba(11, 39, 67, 0.94);
}

.page-about .about-fact-value {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 22px;
  line-height: 1.2;
  color: var(--cyan);
}

.page-about .about-fact:nth-child(2) .about-fact-value,
.page-about .about-fact:nth-child(4) .about-fact-value {
  color: var(--orange-soft);
}

.page-about .about-fact-label {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--rock);
}

/* ---------- 章节胶囊带 ---------- */
.page-about .about-jump {
  background: var(--ink-mid);
  border-top: 1px solid rgba(38, 224, 208, 0.18);
  border-bottom: 1px solid rgba(38, 224, 208, 0.18);
  padding: 14px 0;
}

.page-about .about-jump-inner {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 2px;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-jump-inner::-webkit-scrollbar {
  display: none;
}

.page-about .about-jump-link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid rgba(38, 224, 208, 0.26);
  border-radius: var(--radius-pill);
  font-size: 14px;
  color: var(--text-hi);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .about-jump-link:hover,
.page-about .about-jump-link:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(38, 224, 208, 0.09);
}

.page-about .about-jump-link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .about-jump-idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

/* ---------- 通用章节骨架 ---------- */
.page-about .about-section {
  padding: 52px 0;
}

.page-about .about-section--paper {
  background: var(--paper);
}

.page-about .about-section--paper-light {
  background: var(--paper-light);
}

.page-about .about-section--dark {
  background:
    radial-gradient(100% 80% at 96% 0%, rgba(58, 27, 107, 0.55), rgba(7, 26, 47, 0) 62%),
    var(--ink-deep);
  color: var(--text-hi);
}

.page-about .about-split {
  display: grid;
  gap: 20px;
}

.page-about .about-rail {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 12px;
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .about-rail-label {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--ink);
}

.page-about .about-section--dark .about-rail-label {
  color: var(--text-hi);
}

.page-about .about-rail-note {
  flex: 1 1 100%;
  margin: 0;
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.75;
  color: var(--rock);
}

.page-about .about-heading {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.6vw, 38px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-section--dark .about-heading {
  color: var(--text-hi);
}

.page-about .about-body p {
  margin: 0 0 18px;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink-mid-text);
}

.page-about .about-body p:last-child {
  margin-bottom: 0;
}

.page-about .about-section--dark .about-body p {
  color: var(--text-mid);
}

.page-about .about-body .about-intro {
  max-width: 34em;
  margin-bottom: 24px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 17.5px;
  line-height: 1.9;
  color: var(--ink);
}

.page-about .about-section--dark .about-body .about-intro {
  color: var(--text-hi);
}

.page-about .about-body .about-quote {
  margin: 24px 0;
  max-width: 30em;
  padding-left: 18px;
  border-left: 3px solid var(--clay);
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 18px;
  line-height: 1.85;
  color: var(--ink);
}

/* ---------- 图片框 ---------- */
.page-about .about-figure {
  margin: 26px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-m);
  border: 1px solid var(--edge-paper);
  object-fit: cover;
  background: var(--ink-mid);
}

.page-about .about-figure--on-dark img {
  border-color: rgba(38, 224, 208, 0.22);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--rock);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .about-stage {
  position: relative;
  padding: 0 0 30px 40px;
}

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

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 7px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink-deep);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(38, 224, 208, 0.12);
}

.page-about .about-stage--key::before {
  border-color: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 42, 0.16);
}

.page-about .about-stage::after {
  content: "";
  position: absolute;
  left: 11px;
  top: 28px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, rgba(38, 224, 208, 0.5), rgba(38, 224, 208, 0.12));
}

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

.page-about .about-stage-when {
  display: inline-block;
  padding: 3px 9px;
  border-radius: var(--radius-s);
  background: rgba(38, 224, 208, 0.12);
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-stage--key .about-stage-when {
  background: rgba(255, 106, 42, 0.16);
  color: var(--orange-soft);
}

.page-about .about-stage-title {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  line-height: 1.4;
  color: var(--text-hi);
}

.page-about .about-stage-text {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-mid);
}

/* ---------- 内容板块 ---------- */
.page-about .about-groups {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-group {
  padding: 18px;
  border: 1px solid var(--edge-paper);
  border-radius: var(--radius-m);
  background: var(--paper-light);
  box-shadow: 7px 7px 0 -2px rgba(110, 139, 107, 0.16);
}

.page-about .about-group--note {
  background: rgba(244, 239, 230, 0.9);
  box-shadow: 7px 7px 0 -2px rgba(38, 224, 208, 0.24);
}

.page-about .about-group-name {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  color: var(--ink);
}

.page-about .about-body .about-group-text {
  margin: 0;
  max-width: none;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-mid-text);
}

/* ---------- 合作要点 ---------- */
.page-about .about-points {
  display: grid;
  gap: 12px;
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-point {
  padding: 16px 18px;
  border: 1px solid rgba(38, 224, 208, 0.2);
  border-radius: var(--radius-m);
  background: rgba(11, 39, 67, 0.78);
}

.page-about .about-point-title {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 15.5px;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-body .about-point-text {
  margin: 0;
  max-width: none;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-mid);
}

/* ---------- 服务能力 ---------- */
.page-about .about-caps {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid rgba(10, 13, 18, 0.14);
}

.page-about .about-cap {
  display: grid;
  gap: 6px;
  padding: 20px 0;
  border-bottom: 1px solid rgba(10, 13, 18, 0.14);
}

.page-about .about-cap-name {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  color: var(--ink);
}

.page-about .about-cap-idx {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .about-body .about-cap-text {
  margin: 0;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-mid-text);
}

/* ---------- 场景筛选 ---------- */
.page-about .about-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 4px 0 14px;
}

.page-about .about-filter-count {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--rock);
}

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

.page-about .about-scene {
  padding: 18px;
  border: 1px solid var(--edge-paper);
  border-radius: var(--radius-m);
  background: var(--paper-light);
  box-shadow: 0 2px 0 rgba(10, 13, 18, 0.05);
}

.page-about [data-filter-item][hidden] {
  display: none;
}

.page-about .about-scene-title {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 16.5px;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-body .about-scene-text {
  margin: 0;
  max-width: none;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-mid-text);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  padding: 54px 0 62px;
  color: var(--text-hi);
  background:
    radial-gradient(95% 120% at 100% 0%, rgba(122, 60, 255, 0.42), rgba(58, 27, 107, 0) 62%),
    radial-gradient(80% 80% at 0% 100%, rgba(38, 224, 208, 0.14), rgba(7, 26, 47, 0) 66%),
    var(--ink-deep);
}

.page-about .about-cta-title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.6vw, 40px);
  line-height: 1.22;
  color: var(--text-hi);
}

.page-about .about-cta-lead {
  margin: 0 0 28px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-mid);
}

.page-about .about-cta-links {
  display: grid;
  gap: 12px;
}

.page-about .about-cta-link {
  display: block;
  min-height: 44px;
  padding: 18px;
  border: 1px solid rgba(38, 224, 208, 0.28);
  border-radius: var(--radius-m);
  background: rgba(11, 39, 67, 0.74);
  color: var(--text-hi);
  text-decoration: none;
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .about-cta-link:hover {
  border-color: var(--cyan);
  background: rgba(38, 224, 208, 0.1);
  transform: translateY(-2px);
}

.page-about .about-cta-link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .about-cta-link-title {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 16px;
  color: var(--cyan);
}

.page-about .about-cta-link-text {
  display: block;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-mid);
}

/* ---------- 媒体查询 ---------- */
@media (min-width: 720px) {
  .page-about .about-groups {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 30px 0 68px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 56px;
    align-items: end;
    margin-top: 34px;
  }

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

  .page-about .about-hero-facts {
    align-self: end;
  }

  .page-about .about-fact {
    padding: 18px 16px;
  }

  .page-about .about-fact-value {
    font-size: 25px;
  }

  .page-about .about-section {
    padding: 84px 0;
  }

  .page-about .about-split {
    grid-template-columns: var(--about-rail-width) minmax(0, 1fr);
    gap: 60px;
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 96px;
    padding-left: 18px;
    border-left: 2px solid rgba(38, 224, 208, 0.4);
  }

  .page-about .about-num {
    display: block;
    margin-bottom: 8px;
  }

  .page-about .about-rail-label {
    display: block;
    margin-bottom: 10px;
    font-size: 16px;
  }

  .page-about .about-rail-note {
    font-size: 13.5px;
    line-height: 1.8;
  }

  .page-about .about-section--dark .about-rail {
    border-left-color: rgba(38, 224, 208, 0.45);
  }

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

  .page-about .about-cap {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
  }

  .page-about .about-cta {
    padding: 82px 0 90px;
  }

  .page-about .about-cta-links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-stage {
    padding-bottom: 34px;
  }

  .page-about .about-stage-title {
    font-size: 19px;
  }
}

@media (min-width: 1080px) {
  .page-about {
    --about-rail-width: 200px;
  }

  .page-about .about-figure {
    margin-top: 30px;
  }
}

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

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