.page-about {
  --about-line: var(--c-border);
  background: var(--c-midnight);
  color: var(--c-white);
  font-family: var(--font-body);
  padding-bottom: clamp(48px, 8vw, 96px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(40px, 8vw, 96px) 0 clamp(34px, 6vw, 64px);
  background:
    radial-gradient(90% 70% at 88% -12%, rgba(139, 92, 246, 0.30), transparent 62%),
    radial-gradient(80% 60% at -8% 6%, rgba(46, 242, 208, 0.16), transparent 60%),
    var(--c-ink);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto -12% -38% 44%;
  height: 64%;
  z-index: -1;
  transform: skewX(-14deg);
  border-radius: var(--radius-lg);
  background: linear-gradient(120deg, rgba(139, 92, 246, 0.34), rgba(46, 242, 208, 0.08));
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  margin: clamp(16px, 3vw, 24px) 0 0;
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-cyan);
  border: 1px solid rgba(46, 242, 208, 0.4);
  border-radius: var(--radius-pill);
}

.page-about .about-h1 {
  margin: clamp(16px, 3vw, 26px) 0 0;
  max-width: 16ch;
  font-family: var(--font-display);
  font-size: clamp(32px, 7.4vw, 72px);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--c-white);
}

.page-about .about-h1 em {
  display: block;
  margin-top: 0.12em;
  font-style: normal;
  color: var(--c-cyan);
}

.page-about .about-lead {
  margin: clamp(18px, 3vw, 26px) 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: var(--c-grey);
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  background: rgba(10, 16, 38, 0.88);
}

.page-about .fact-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--c-grey);
}

.page-about .fact-val {
  font-family: var(--font-display);
  font-size: clamp(18px, 2.6vw, 24px);
  line-height: 1.1;
  color: var(--c-white);
}

.page-about .fact-val i {
  font-style: normal;
  font-size: 0.62em;
  color: var(--c-cyan);
}

/* ---------- 主体双栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 5vw, 48px);
  align-items: start;
  padding-top: clamp(34px, 6vw, 76px);
}

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

.page-about .rail-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-grey);
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .rail-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 12px;
  font-size: 13px;
  color: var(--c-grey);
  text-decoration: none;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-pill);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--c-cyan);
  border-color: var(--c-cyan);
}

.page-about .rail-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-cyan);
}

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

/* ---------- 章节头 ---------- */
.page-about .about-sec {
  scroll-margin-top: 92px;
}

.page-about .about-sec + .about-sec {
  margin-top: clamp(46px, 8vw, 92px);
}

.page-about .sec-head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: clamp(16px, 3vw, 26px);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .sec-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 4.6vw, 38px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-cyan);
}

.page-about .sec-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 3.4vw, 30px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--c-white);
}

.page-about .sec-year {
  margin-left: auto;
  padding: 4px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-grey);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-pill);
}

/* ---------- 正文 ---------- */
.page-about .about-prose {
  max-width: 68ch;
}

.page-about .about-prose p {
  margin: 0 0 1.05em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--c-grey);
}

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

.page-about .about-prose strong {
  font-weight: 600;
  color: var(--c-white);
}

.page-about .about-figure {
  margin: clamp(22px, 4vw, 34px) 0 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--about-line);
}

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

.page-about .about-figure .media-frame__caption {
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-grey);
  background: rgba(5, 7, 15, 0.7);
}

/* ---------- 方法四格 ---------- */
.page-about .method-list {
  list-style: none;
  margin: clamp(22px, 4vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .method-item {
  padding: clamp(16px, 2.6vw, 24px);
  background: linear-gradient(160deg, rgba(27, 42, 74, 0.92), rgba(10, 16, 38, 0.96));
  transition: background 0.25s var(--ease);
}

.page-about .method-item:hover {
  background: linear-gradient(160deg, rgba(37, 52, 90, 0.98), rgba(13, 20, 45, 0.98));
}

.page-about .method-key {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-cyan);
  border: 1px solid rgba(46, 242, 208, 0.36);
  border-radius: var(--radius-pill);
}

.page-about .method-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--c-grey);
}

/* ---------- 团队 ---------- */
.page-about .team-list {
  list-style: none;
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
}

.page-about .team-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "name count"
    "track track"
    "desc desc";
  gap: 10px 12px;
  padding: 18px 0;
  border-top: 1px solid var(--about-line);
  outline-offset: 4px;
  transition: transform 0.2s var(--ease);
}

.page-about .team-row:last-child {
  border-bottom: 1px solid var(--about-line);
}

.page-about .team-row:hover {
  transform: translateX(3px);
}

.page-about .team-name {
  grid-area: name;
  font-size: 16px;
  font-weight: 600;
  color: var(--c-white);
}

.page-about .team-count {
  grid-area: count;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-cyan);
}

.page-about .team-track {
  grid-area: track;
  height: 6px;
  border-radius: var(--radius-pill);
  background: rgba(37, 52, 90, 0.72);
  overflow: hidden;
}

.page-about .team-fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-violet));
}

.page-about .team-fill--a { width: 35%; }
.page-about .team-fill--b { width: 47%; }
.page-about .team-fill--c { width: 18%; }

.page-about .team-desc {
  grid-area: desc;
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--c-grey);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: clamp(20px, 4vw, 32px) 0 0;
  padding: 0 0 0 22px;
  border-left: 1px solid var(--about-line);
}

.page-about .tl-node {
  position: relative;
  padding-bottom: clamp(22px, 4vw, 34px);
}

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

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-cyan);
  box-shadow: 0 0 0 4px rgba(46, 242, 208, 0.14);
  transition: transform 0.2s var(--ease);
}

.page-about .tl-node:hover::before {
  transform: scale(1.3);
}

.page-about .tl-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.6vw, 28px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-white);
  transition: color 0.2s var(--ease);
}

.page-about .tl-node:hover .tl-year {
  color: var(--c-cyan);
}

.page-about .tl-body h3 {
  margin: 8px 0 6px;
  font-size: 16px;
  font-weight: 600;
  color: var(--c-white);
}

.page-about .tl-body p {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--c-grey);
}

.page-about .tl-note {
  display: block;
  margin-top: 8px;
  padding-left: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-grey);
  border-left: 2px solid var(--c-violet);
}

.page-about .tl-link {
  display: inline-flex;
  margin-top: 10px;
  font-size: 13px;
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 242, 208, 0.42);
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .tl-link:hover,
.page-about .tl-link:focus-visible {
  transform: translateX(2px);
  border-color: var(--c-cyan);
}

/* ---------- 规模数据 ---------- */
.page-about .stat-grid {
  list-style: none;
  margin: clamp(20px, 4vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(16px, 2.6vw, 24px);
  background: rgba(10, 16, 38, 0.9);
  transition: background 0.2s var(--ease);
}

.page-about .stat:hover {
  background: rgba(27, 42, 74, 0.88);
}

.page-about .stat-num {
  font-family: var(--font-display);
  font-size: clamp(26px, 4.6vw, 40px);
  line-height: 1;
  color: var(--c-white);
}

.page-about .stat-unit {
  margin-left: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-cyan);
}

.page-about .stat-label {
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-grey);
}

/* ---------- 协作品质 ---------- */
.page-about .quality-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 28px);
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .quality-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .quality-item {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--about-line);
}

.page-about .quality-item:last-child {
  border-bottom: 1px solid var(--about-line);
}

.page-about .quality-key {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-cyan);
}

.page-about .quality-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--c-grey);
}

.page-about .award-panel {
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid rgba(139, 92, 246, 0.34);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(155deg, rgba(139, 92, 246, 0.26), rgba(46, 242, 208, 0.08) 58%, rgba(10, 16, 38, 0.92));
}

.page-about .award-panel h3 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--c-white);
}

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

.page-about .award-item {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-grey);
}

.page-about .award-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  border-radius: 2px;
  background: var(--c-orange);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(46px, 8vw, 92px);
  padding: clamp(24px, 4vw, 44px);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(46, 242, 208, 0.20), transparent 55%),
    linear-gradient(140deg, rgba(27, 42, 74, 0.95), rgba(5, 7, 15, 0.98));
}

.page-about .cta-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.22;
  color: var(--c-white);
}

.page-about .cta-text {
  margin: 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--c-grey);
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.page-about .cta-contact {
  display: grid;
  gap: 4px;
  padding-top: clamp(16px, 3vw, 0px);
  border-top: 1px solid var(--about-line);
}

.page-about .cta-contact-key {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-grey);
}

.page-about .cta-contact-val {
  font-size: 14px;
  line-height: 1.6;
  color: var(--c-white);
  word-break: break-word;
}

/* ---------- 渐进增强：悬停展开分工说明 ---------- */
@media (hover: hover) and (pointer: fine) {
  .page-about .team-desc {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.25s var(--ease), opacity 0.25s var(--ease);
  }

  .page-about .team-row:hover .team-desc,
  .page-about .team-row:focus-within .team-desc {
    max-height: 10em;
    opacity: 1;
  }
}

/* ---------- 断点 ---------- */
@media (min-width: 680px) {
  .page-about .method-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .about-facts {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .timeline {
    padding-left: 28px;
  }

  .page-about .tl-node {
    display: grid;
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 4px 24px;
  }

  .page-about .tl-year {
    grid-column: 1;
  }

  .page-about .tl-body {
    grid-column: 2;
  }
}

@media (min-width: 860px) {
  .page-about .quality-grid {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: start;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) 260px;
    align-items: center;
  }

  .page-about .cta-contact {
    padding-top: 0;
    padding-left: clamp(0px, 2vw, 24px);
    border-top: 0;
    border-left: 1px solid var(--about-line);
  }
}

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: clamp(40px, 5vw, 80px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 92px;
  }

  .page-about .rail-list {
    flex-direction: column;
    gap: 0;
    padding-bottom: 0;
    overflow: visible;
    border-left: 1px solid var(--about-line);
  }

  .page-about .rail-link {
    position: relative;
    padding: 9px 0 9px 16px;
    border: 0;
    border-radius: 0;
    background: transparent;
  }

  .page-about .rail-link::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 6px;
    bottom: 6px;
    width: 2px;
    background: transparent;
    transition: background 0.2s var(--ease);
  }

  .page-about .rail-link:hover::before,
  .page-about .rail-link:focus-visible::before {
    background: var(--c-cyan);
  }
}
<<<END>>>