.page-about {
  --about-panel: rgba(13, 31, 63, 0.66);
  --about-panel-strong: rgba(16, 38, 69, 0.9);
  background: var(--ink-900);
  color: var(--paper);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 5vw, 52px) 0 clamp(40px, 7vw, 76px);
  background:
    radial-gradient(90% 70% at 88% 4%, rgba(76, 141, 255, 0.2), transparent 62%),
    radial-gradient(70% 60% at 6% 96%, rgba(40, 224, 185, 0.1), transparent 60%),
    linear-gradient(168deg, var(--ink-800), var(--ink-900) 68%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(to right, rgba(143, 161, 189, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(143, 161, 189, 0.07) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(150deg, #000 0%, transparent 74%);
  mask-image: linear-gradient(150deg, #000 0%, transparent 74%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: 0;
  left: 46%;
  top: -18%;
  width: 76%;
  height: 78%;
  background: linear-gradient(122deg, rgba(255, 90, 54, 0.3), rgba(167, 139, 250, 0.1) 58%, transparent 78%);
  transform: rotate(-13deg);
  border-radius: 44% 56% 40% 60% / 56% 42% 58% 44%;
  pointer-events: none;
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
}

.page-about .about-title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 7vw, 3.8rem);
  line-height: 1.04;
  letter-spacing: -0.025em;
  color: var(--paper);
}

.page-about .about-title em {
  font-style: normal;
  color: var(--flame);
}

.page-about .about-lede {
  margin: clamp(14px, 2.4vw, 20px) 0 0;
  max-width: 38rem;
  font-family: var(--font-serif);
  font-size: clamp(1rem, 2.4vw, 1.08rem);
  line-height: 1.85;
  color: rgba(247, 250, 255, 0.82);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .about-hero-index {
  display: grid;
  gap: 12px;
  border-left: 2px solid var(--line);
  padding-left: clamp(14px, 2.4vw, 22px);
}

.page-about .index-head {
  margin: 0;
  font-family: var(--font-label);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mist);
}

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

.page-about .index-link {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr);
  align-items: baseline;
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line-soft);
  color: var(--paper);
  text-decoration: none;
  transition: color 180ms ease, padding-left 180ms ease;
}

.page-about .index-link:hover,
.page-about .index-link:focus-visible {
  color: var(--flame);
  padding-left: 6px;
}

.page-about .index-k {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .index-link:hover .index-k,
.page-about .index-link:focus-visible .index-k {
  color: var(--flame);
}

.page-about .index-t {
  font-size: 0.95rem;
  letter-spacing: 0.01em;
}

.page-about .about-live {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--live);
}

.page-about .about-live-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--live);
  animation: page-about-pulse 2.4s ease-in-out infinite;
}

@keyframes page-about-pulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(40, 224, 185, 0.16); }
  50% { box-shadow: 0 0 0 9px rgba(40, 224, 185, 0.03); }
}

.page-about .about-hero-media {
  margin: clamp(26px, 4.4vw, 44px) 0 0;
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: clamp(44px, 7vw, 84px) 0;
}

.page-about .about-chapter + .about-chapter {
  border-top: 1px solid var(--line-soft);
}

.page-about .chapter-head {
  display: grid;
  gap: 12px;
  max-width: 48rem;
  margin-bottom: clamp(22px, 3.6vw, 36px);
}

.page-about .chapter-num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.24em;
  color: var(--flame);
}

.page-about .chapter-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.42rem, 4.2vw, 2.15rem);
  line-height: 1.18;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .chapter-quote {
  margin: 0;
  padding-left: 16px;
  border-left: 2px solid var(--violet);
  font-family: var(--font-serif);
  font-size: clamp(0.98rem, 2.3vw, 1.08rem);
  line-height: 1.85;
  color: rgba(247, 250, 255, 0.78);
}

/* ---------- 01 场景 ---------- */
.page-about .scene-grid {
  display: grid;
  gap: 14px;
}

.page-about .scene-card {
  position: relative;
  padding: clamp(18px, 2.6vw, 26px);
  background: linear-gradient(160deg, var(--about-panel), rgba(7, 19, 43, 0.35));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .scene-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(to bottom, var(--flame), var(--violet));
}

.page-about .scene-tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 9px;
  border-radius: 999px;
  background: rgba(167, 139, 250, 0.16);
  font-family: var(--font-label);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--violet);
}

.page-about .scene-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .scene-text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.78;
  color: rgba(247, 250, 255, 0.74);
}

@media (min-width: 720px) {
  .page-about .scene-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 02 原则 ---------- */
.page-about .principle-grid {
  display: grid;
  gap: 22px;
}

.page-about .split-demo {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  padding: 12px;
  background: var(--about-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .split-col {
  padding: 14px 12px;
  border: 1px dashed var(--line);
  border-radius: var(--radius-sm);
  background: rgba(7, 19, 43, 0.5);
}

.page-about .split-home {
  border-color: rgba(255, 90, 54, 0.45);
}

.page-about .split-away {
  border-color: rgba(76, 141, 255, 0.45);
}

.page-about .split-tag {
  display: inline-block;
  margin-bottom: 12px;
  padding: 3px 9px;
  border-radius: 999px;
  font-family: var(--font-label);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
}

.page-about .split-home .split-tag {
  background: rgba(255, 90, 54, 0.18);
  color: var(--flame-soft);
}

.page-about .split-away .split-tag {
  background: rgba(76, 141, 255, 0.18);
  color: var(--paper);
}

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

.page-about .split-list li {
  position: relative;
  padding-left: 14px;
  font-size: 0.87rem;
  line-height: 1.5;
  color: rgba(247, 250, 255, 0.8);
}

.page-about .split-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--mist);
}

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

.page-about .principle-copy p {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.85;
  color: rgba(247, 250, 255, 0.78);
}

.page-about .about-textlink {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  padding-bottom: 2px;
  border-bottom: 1px solid rgba(40, 224, 185, 0.4);
  font-family: var(--font-label);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  color: var(--live);
  text-decoration: none;
  transition: color 160ms ease, border-color 160ms ease;
}

.page-about .about-textlink:hover,
.page-about .about-textlink:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

@media (min-width: 900px) {
  .page-about .principle-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: clamp(24px, 3.6vw, 40px);
  }
}

/* ---------- 03 校验 ---------- */
.page-about .checks-layout {
  display: grid;
  gap: clamp(20px, 3.4vw, 36px);
}

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

.page-about .checks-list li {
  position: relative;
  padding: 16px 18px 16px 20px;
  background: var(--about-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  transition: border-color 180ms ease;
}

.page-about .checks-list li:hover {
  border-color: rgba(255, 90, 54, 0.45);
}

.page-about .check-no {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.2em;
  color: var(--live);
}

.page-about .check-title {
  margin: 6px 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--paper);
}

.page-about .checks-list p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: rgba(247, 250, 255, 0.74);
}

@media (min-width: 940px) {
  .page-about .checks-layout {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }
}

/* ---------- 04 时间线 ---------- */
.page-about .about-timeline {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(248px, 82%);
  gap: 14px;
  padding: 4px 4px 18px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
}

.page-about .about-timeline > * {
  scroll-snap-align: start;
}

.page-about .tl-node {
  position: relative;
  padding: 18px 18px 16px;
  background: linear-gradient(180deg, var(--about-panel-strong), rgba(7, 19, 43, 0.5));
  border: 1px solid var(--line);
  border-top: 2px solid rgba(40, 224, 185, 0.55);
  border-radius: var(--radius);
}

.page-about .tl-node summary {
  display: grid;
  gap: 6px;
  padding-right: 26px;
  list-style: none;
  cursor: pointer;
}

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

.page-about .tl-node summary::after {
  content: "＋";
  position: absolute;
  right: 16px;
  top: 16px;
  font-size: 0.9rem;
  line-height: 1;
  color: var(--mist);
}

.page-about .tl-node[open] summary::after {
  content: "－";
  color: var(--live);
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
  color: var(--flame);
}

.page-about .tl-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.97rem;
  color: var(--paper);
}

.page-about .tl-body {
  margin: 12px 0 0;
  font-size: 0.91rem;
  line-height: 1.8;
  color: rgba(247, 250, 255, 0.75);
}

@media (min-width: 900px) {
  .page-about .about-timeline {
    grid-auto-flow: row;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    grid-auto-columns: auto;
    gap: 16px;
    padding: 0;
    overflow: visible;
  }
}

/* ---------- 05 团队 ---------- */
.page-about .team-layout {
  display: grid;
  gap: clamp(20px, 3.4vw, 36px);
}

.page-about .team-text {
  margin: 0 0 14px;
  font-size: 0.96rem;
  line-height: 1.85;
  color: rgba(247, 250, 255, 0.78);
}

.page-about .team-text:last-of-type {
  margin-bottom: 0;
}

.page-about .team-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(126px, 1fr));
  gap: 1px;
  margin-top: clamp(24px, 3.6vw, 38px);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .stat {
  display: grid;
  gap: 4px;
  padding: 16px 14px;
  background: var(--ink-900);
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.22rem, 3.2vw, 1.6rem);
  font-weight: 600;
  line-height: 1.12;
  font-variant-numeric: tabular-nums;
  color: var(--flame);
}

.page-about .stat-label {
  font-family: var(--font-label);
  font-size: 0.71rem;
  letter-spacing: 0.14em;
  color: var(--mist);
}

@media (min-width: 940px) {
  .page-about .team-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

/* ---------- 06 收尾 ---------- */
.page-about .about-chapter--closing {
  overflow: hidden;
}

.page-about .about-chapter--closing::before {
  content: "";
  position: absolute;
  z-index: 0;
  right: -16%;
  top: -22%;
  width: min(560px, 80%);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 36% 34%, rgba(255, 90, 54, 0.34), rgba(167, 139, 250, 0.14) 56%, transparent 74%);
  border-radius: 46% 54% 38% 62% / 58% 42% 58% 42%;
  pointer-events: none;
}

.page-about .about-chapter--closing::after {
  content: "";
  position: absolute;
  z-index: 0;
  left: -12%;
  bottom: -34%;
  width: min(420px, 66%);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 60% 40%, rgba(40, 224, 185, 0.2), transparent 68%);
  border-radius: 58% 42% 52% 48% / 44% 58% 42% 56%;
  pointer-events: none;
}

.page-about .closing-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 14px;
  max-width: 56rem;
}

.page-about .closing-lede {
  margin: 0;
  max-width: 44rem;
  font-family: var(--font-serif);
  font-size: clamp(0.98rem, 2.3vw, 1.08rem);
  line-height: 1.85;
  color: rgba(247, 250, 255, 0.8);
}

.page-about .closing-contacts {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .closing-contacts li {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  background: rgba(13, 31, 63, 0.6);
  border: 1px solid var(--line);
  border-left: 2px solid var(--flame);
  border-radius: var(--radius-sm);
}

.page-about .closing-label {
  font-family: var(--font-label);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .closing-value {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--paper);
  word-break: break-word;
}

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

@media (min-width: 720px) {
  .page-about .closing-contacts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 380px) {
  .page-about .split-demo {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-live-dot {
    animation: none;
  }
  .page-about .index-link,
  .page-about .checks-list li,
  .page-about .about-textlink {
    transition: none;
  }
}
<<<END>>>