.page-about {
  --about-rail: 150px;
  --about-gap: clamp(28px, 5vw, 72px);
  --about-section-pad: clamp(44px, 7vw, 84px);
  --about-num-stroke: rgba(126, 151, 173, 0.7);
}

.page-about .breadcrumbs {
  padding-top: clamp(14px, 2.2vw, 26px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  padding-block: clamp(20px, 3vw, 36px) clamp(36px, 6vw, 72px);
}

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

.page-about .about-hero__title {
  margin: 14px 0 0;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.2rem, 7vw, 4.5rem);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero .lede {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 56ch;
  color: var(--sand);
  font-size: clamp(0.98rem, 1.4vw, 1.08rem);
  line-height: 1.75;
}

.page-about .hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .hero-facts li {
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  background: var(--ink-800);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.02em;
  color: var(--sand);
}

.page-about .about-hero__media {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-xl);
  border: 1px solid var(--line-strong);
  background: var(--ink-800);
  box-shadow: var(--shadow-lift);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
  padding-block: var(--about-section-pad);
  border-top: 1px solid var(--line);
  scroll-margin-top: 90px;
}

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

.page-about .chapter-num {
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--mist);
}

@supports ((-webkit-text-stroke: 1px red) or (text-stroke: 1px red)) {
  .page-about .chapter-num {
    color: transparent;
    -webkit-text-stroke: 1px var(--about-num-stroke);
  }

  .page-about .about-chapter:target .chapter-num {
    color: var(--cyan);
    -webkit-text-stroke-color: var(--cyan);
  }
}

.page-about .chapter-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .chapter-body {
  min-width: 0;
}

.page-about .chapter-body > .section-title {
  margin: 0 0 clamp(14px, 2vw, 20px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 4.4vw, 2.55rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .chapter-body p {
  margin: 0 0 14px;
  max-width: 66ch;
  color: var(--sand);
  line-height: 1.75;
}

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

.page-about .chapter-body a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .chapter-link {
  margin-top: clamp(16px, 2.4vw, 22px);
  font-size: 0.94rem;
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  display: grid;
  gap: 14px;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan), rgba(54, 226, 208, 0.16) 55%, var(--gold));
}

.page-about .tl-item {
  position: relative;
  padding: clamp(15px, 2.2vw, 22px) clamp(16px, 2.4vw, 24px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(11, 30, 54, 0.92), rgba(6, 17, 31, 0.6));
  outline: none;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 24px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  transition: box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .tl-item:hover,
.page-about .tl-item:focus-visible {
  transform: translateY(-3px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow-lift);
}

.page-about .tl-item:hover::before,
.page-about .tl-item:focus-visible::before {
  border-color: var(--cyan);
  box-shadow: 0 0 0 5px var(--cyan-soft), 0 0 14px rgba(54, 226, 208, 0.7);
}

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

.page-about .tl-item--current {
  border-color: rgba(246, 185, 74, 0.42);
  background: linear-gradient(160deg, rgba(16, 42, 71, 0.96), rgba(11, 30, 54, 0.7));
}

.page-about .tl-item--current::before {
  border-color: var(--gold);
}

.page-about .tl-item--current:hover::before,
.page-about .tl-item--current:focus-visible::before {
  box-shadow: 0 0 0 5px var(--gold-soft), 0 0 14px rgba(246, 185, 74, 0.6);
}

.page-about .tl-version {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .tl-item--current .tl-version {
  color: var(--gold);
}

.page-about .tl-item h3 {
  margin: 6px 0 6px;
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  font-weight: 700;
  color: var(--paper);
}

.page-about .tl-summary {
  margin: 0;
  font-size: 0.91rem;
  line-height: 1.7;
  color: var(--sand);
  opacity: 0.82;
  transition: opacity var(--dur) var(--ease);
}

.page-about .tl-item:hover .tl-summary,
.page-about .tl-item:focus-visible .tl-summary {
  opacity: 1;
}

/* ---------- 维护节奏列表 ---------- */
.page-about .maintain-list {
  display: grid;
  gap: 14px;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .maintain-list li {
  display: grid;
  gap: 6px;
  padding-left: 16px;
  border-left: 2px solid var(--line-strong);
  transition: border-color var(--dur) var(--ease);
}

.page-about .maintain-list li:hover {
  border-left-color: var(--cyan);
}

.page-about .maintain-list__when {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .maintain-list li p {
  margin: 0;
  font-size: 0.93rem;
  color: var(--sand);
}

/* ---------- 横向主题带 ---------- */
.page-about .about-band {
  margin-block: clamp(16px, 3vw, 36px);
  padding-block: clamp(40px, 6vw, 76px);
  border-block: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 12% 0%, rgba(201, 195, 182, 0.16), transparent 62%),
    linear-gradient(180deg, rgba(16, 42, 71, 0.86), rgba(6, 17, 31, 0.16));
}

.page-about .about-band__inner {
  display: grid;
  gap: clamp(22px, 3.6vw, 36px);
}

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

.page-about .about-band__head .section-title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 4.4vw, 2.55rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .flow {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: flow;
}

.page-about .flow__step {
  counter-increment: flow;
  padding: 16px 18px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(6, 17, 31, 0.58);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.page-about .flow__step:hover {
  transform: translateY(-3px);
  border-color: rgba(54, 226, 208, 0.45);
  background: rgba(11, 30, 54, 0.85);
}

.page-about .flow__step::before {
  content: "0" counter(flow);
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .flow__step h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  color: var(--paper);
}

.page-about .flow__step p {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.65;
  color: var(--sand);
}

.page-about .about-band__media {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-xl);
  border: 1px solid var(--line);
  background: var(--ink-800);
}

.page-about .about-band__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 12px;
  margin: clamp(18px, 3vw, 26px) 0 0;
}

.page-about .team-card {
  padding: clamp(16px, 2.4vw, 22px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--ink-800);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .team-card:hover {
  transform: translateY(-3px);
  border-color: rgba(54, 226, 208, 0.45);
}

.page-about .team-card__count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  height: 42px;
  padding: 0 10px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(54, 226, 208, 0.45);
  background: var(--cyan-soft);
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .team-card h3 {
  margin: 12px 0 6px;
  font-size: 1.02rem;
  color: var(--paper);
}

.page-about .team-card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.68;
  color: var(--sand);
}

.page-about .about-team__media {
  margin: clamp(20px, 3vw, 28px) 0 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--ink-800);
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .promise-list {
  display: grid;
  gap: 12px;
  margin: clamp(20px, 3vw, 26px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .promise-list li {
  position: relative;
  padding-left: 24px;
  font-size: 0.93rem;
  line-height: 1.7;
  color: var(--sand);
}

.page-about .promise-list li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 0.66em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(54, 226, 208, 0.65);
}

/* ---------- 内容协作 ---------- */
.page-about .eco-list {
  display: grid;
  gap: 14px;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .eco-list li {
  padding: 2px 0 2px 16px;
  border-left: 2px solid var(--gold);
}

.page-about .eco-list h3 {
  margin: 0 0 4px;
  font-size: 0.99rem;
  color: var(--paper);
}

.page-about .eco-list p {
  margin: 0;
  font-size: 0.91rem;
  line-height: 1.68;
  color: var(--sand);
}

/* ---------- 使用场景 ---------- */
.page-about .scene-list {
  display: grid;
  gap: 14px;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .scene-list li {
  padding: clamp(16px, 2.4vw, 22px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(11, 30, 54, 0.92), rgba(6, 17, 31, 0.68));
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .scene-list li:hover {
  transform: translateY(-3px);
  border-color: var(--line-strong);
}

.page-about .scene-list h3 {
  margin: 0 0 8px;
  font-size: 1.02rem;
  color: var(--paper);
}

.page-about .scene-list p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--sand);
}

/* ---------- 收束与数据胶囊 ---------- */
.page-about .about-outro {
  padding-block: clamp(40px, 6vw, 80px) clamp(48px, 7vw, 88px);
  border-top: 1px solid var(--line);
}

.page-about .about-outro .section-title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 4.4vw, 2.55rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-stats {
  display: grid;
  gap: 12px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .stat-pill {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 10px;
  padding: 16px 20px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--ink-800);
  outline: none;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.page-about .stat-pill:hover,
.page-about .stat-pill:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(246, 185, 74, 0.55);
  background: linear-gradient(150deg, rgba(246, 185, 74, 0.13), rgba(11, 30, 54, 0.92));
}

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

.page-about .stat-pill__num {
  font-family: var(--font-mono);
  font-size: clamp(1.55rem, 3vw, 2.05rem);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-about .stat-pill__label {
  font-size: 0.94rem;
  color: var(--paper);
}

.page-about .stat-pill__note {
  flex-basis: 100%;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--mist);
  transition: color var(--dur) var(--ease);
}

.page-about .stat-pill:hover .stat-pill__note,
.page-about .stat-pill:focus-visible .stat-pill__note {
  color: var(--sand);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 30px);
}

@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 760px) {
  .page-about .eco-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 26px;
  }
}

@media (min-width: 900px) {
  .page-about .about-chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
  }

  .page-about .chapter-rail {
    position: sticky;
    top: 92px;
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .page-about .about-band__media {
    margin-top: 4px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    align-items: center;
  }

  .page-about .about-hero__title {
    max-width: 18ch;
  }
}

@media (min-width: 1080px) {
  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-item,
  .page-about .flow__step,
  .page-about .team-card,
  .page-about .scene-list li,
  .page-about .stat-pill {
    transition: opacity var(--dur) var(--ease), border-color var(--dur) var(--ease);
  }

  .page-about .tl-item:hover,
  .page-about .tl-item:focus-visible,
  .page-about .flow__step:hover,
  .page-about .team-card:hover,
  .page-about .scene-list li:hover,
  .page-about .stat-pill:hover,
  .page-about .stat-pill:focus-visible {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>
<<<END>>>