.page-about {
  --about-gap: 18px;
  --about-radius: var(--radius-lg);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 26px;
  padding: 22px 0 6px;
}

.page-about .about-hero h1 {
  margin: 10px 0 14px;
  font-size: clamp(28px, 5.4vw, 48px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.18;
  color: var(--text);
}

.page-about .about-lead {
  margin: 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
  opacity: 0.86;
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .hero-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px;
  background: var(--ink-800);
}

.page-about .hero-fact-num {
  font-family: var(--font-mono);
  font-size: clamp(19px, 4.4vw, 26px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .hero-fact:nth-child(3) .hero-fact-num {
  color: var(--yellow);
}

.page-about .hero-fact:nth-child(4) .hero-fact-num {
  color: var(--violet);
}

.page-about .hero-fact-label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 章节通用 ---------- */
.page-about .sec {
  padding: 42px 0;
}

.page-about .sec-head {
  margin-bottom: 22px;
}

.page-about .sec-kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .sec-title {
  margin: 0 0 10px;
  font-size: clamp(21px, 4vw, 32px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.28;
  color: var(--text);
}

.page-about .sec-note {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 三类使用者 ---------- */
.page-about .who-grid {
  display: grid;
  gap: 14px;
}

.page-about .who-card {
  padding: 20px 18px;
  background: linear-gradient(180deg, var(--ink-800), var(--ink-900));
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius-md);
}

.page-about .who-card:nth-child(2) {
  border-left-color: var(--orange);
}

.page-about .who-card:nth-child(3) {
  border-left-color: var(--violet);
}

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

.page-about .who-card:nth-child(2) .who-time {
  color: var(--orange);
}

.page-about .who-card:nth-child(3) .who-time {
  color: var(--violet);
}

.page-about .who-card:nth-child(1) .who-time {
  color: var(--cyan);
}

.page-about .who-title {
  margin: 8px 0 10px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}

.page-about .who-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 覆盖范围 ---------- */
.page-about .scope-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  overflow: hidden;
}

.page-about .scope-cell {
  padding: 20px 16px;
  background: var(--ink-800);
}

.page-about .scope-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 6vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .scope-cell:nth-child(2) .scope-num {
  color: var(--violet);
}

.page-about .scope-cell:nth-child(3) .scope-num {
  color: var(--yellow);
}

.page-about .scope-cell:nth-child(4) .scope-num {
  color: var(--orange);
}

.page-about .scope-label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .scope-foot {
  margin: 18px 0 0;
  max-width: 68ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .scope-clock {
  font-family: var(--font-mono);
  color: var(--cyan);
  font-weight: 700;
}

/* ---------- 能力表 ---------- */
.page-about .cap-list {
  border-top: 1px solid var(--line);
}

.page-about .cap-row {
  display: grid;
  gap: 8px;
  padding: 16px 12px 16px 14px;
  border-bottom: 1px solid var(--line);
  border-left: 2px solid transparent;
  text-decoration: none;
  color: inherit;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease), opacity 0.2s var(--ease);
}

.page-about .cap-row:hover,
.page-about .cap-row:focus-visible {
  background: var(--ink-800);
  border-left-color: var(--cyan);
}

.page-about .cap-list:hover .cap-row:not(:hover) {
  opacity: 0.52;
}

.page-about .cap-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.page-about .cap-desc {
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .cap-link {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

/* ---------- 团队与流程 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 24px;
  margin-bottom: 30px;
}

.page-about .team-flow {
  padding: 18px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
}

.page-about .flow-svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .flow-svg .flow-node {
  fill: var(--cyan);
}

.page-about .flow-svg .flow-node--end {
  fill: var(--violet);
}

.page-about .flow-svg text {
  fill: var(--muted);
  font-family: var(--font-mono);
  font-size: 26px;
  text-anchor: middle;
}

.page-about .flow-note {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .team-figure,
.page-about .source-figure {
  margin: 0;
}

.page-about .team-figure .media-frame img,
.page-about .source-figure .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.page-about .team-figure .media-caption,
.page-about .source-figure .media-caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 岗位筛选 ---------- */
.page-about .role-filter {
  padding-top: 8px;
  border-top: 1px solid var(--line-soft);
}

.page-about .role-grid {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.page-about .role-card {
  padding: 16px 16px 18px;
  background: var(--ink-700);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

.page-about .role-card[hidden] {
  display: none;
}

.page-about .role-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin: 0 0 10px;
}

.page-about .role-rank,
.page-about .role-count {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--yellow);
}

.page-about .role-name {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--text);
}

.page-about .role-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .tl-wrap {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .tl-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.16;
  pointer-events: none;
}

.page-about .tl-track {
  position: relative;
  display: flex;
  gap: 14px;
  margin: 0;
  padding: 24px 18px 10px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .tl-item {
  flex: 0 0 244px;
  scroll-snap-align: start;
}

.page-about .tl-node {
  height: 100%;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(11, 20, 18, 0.84);
  backdrop-filter: blur(6px);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .tl-node:hover {
  border-color: var(--line);
  transform: translateY(-2px);
}

.page-about .tl-node[open] {
  border-color: rgba(52, 224, 200, 0.55);
}

.page-about .tl-node summary {
  display: grid;
  gap: 8px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(52, 224, 200, 0.14), 0 0 14px rgba(52, 224, 200, 0.65);
  animation: about-pulse 2.4s ease-in-out infinite;
}

.page-about .tl-dot--warm {
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 138, 61, 0.14), 0 0 14px rgba(255, 138, 61, 0.6);
}

.page-about .tl-dot--violet {
  background: var(--violet);
  box-shadow: 0 0 0 4px rgba(124, 107, 255, 0.16), 0 0 14px rgba(124, 107, 255, 0.6);
}

.page-about .tl-dot--yellow {
  background: var(--yellow);
  box-shadow: 0 0 0 4px rgba(242, 201, 76, 0.16), 0 0 14px rgba(242, 201, 76, 0.6);
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .tl-name {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.42;
  color: var(--text);
}

.page-about .tl-body {
  margin: 12px 0 0;
  padding-top: 10px;
  border-top: 1px solid var(--line);
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .tl-hint {
  position: relative;
  margin: 0;
  padding: 0 18px 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

/* ---------- 内容来源 ---------- */
.page-about .source-grid {
  display: grid;
  gap: 24px;
}

.page-about .source-list {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .source-item {
  display: grid;
  gap: 4px;
  padding: 13px 0 13px 14px;
  border-bottom: 1px solid var(--line);
  border-left: 2px solid var(--line);
}

.page-about .source-item:first-child {
  border-top: 1px solid var(--line);
}

.page-about .source-item-title {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--text);
}

.page-about .source-item-text {
  font-size: 13.8px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 结尾召唤 ---------- */
.page-about .about-cta {
  padding: 26px 20px 28px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: linear-gradient(135deg, var(--ink-700), var(--ink-800) 62%, var(--ink-900));
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  font-size: clamp(20px, 3.6vw, 28px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.3;
  color: var(--text);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

@keyframes about-pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.45;
  }
}

/* ---------- 中等屏 ---------- */
@media (min-width: 700px) {
  .page-about .who-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--about-gap);
  }

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

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

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 0.88fr);
    gap: 46px;
    align-items: end;
    padding: 34px 0 10px;
  }

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

  .page-about .sec-head {
    margin-bottom: 28px;
  }

  .page-about .cap-row {
    grid-template-columns: 190px minmax(0, 1fr) 104px;
    align-items: center;
    gap: 20px;
    padding: 18px 16px 18px 18px;
  }

  .page-about .cap-link {
    text-align: right;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: 32px;
    align-items: start;
  }

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

  .page-about .tl-item {
    flex-basis: 268px;
  }

  .page-about .tl-track {
    padding: 30px 24px 12px;
  }

  .page-about .source-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .about-cta {
    padding: 36px 34px 38px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-dot {
    animation: none;
  }

  .page-about .tl-node,
  .page-about .cap-row {
    transition: none;
  }

  .page-about .tl-node:hover {
    transform: none;
  }
}
<<<END>>>