.page-about {
  background: var(--ink);
  color: var(--white);
  overflow-x: clip;
}

.page-about .breadcrumb {
  padding-top: 26px;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 32px 0 clamp(44px, 6vw, 88px);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -180px;
  right: -14%;
  width: min(860px, 108vw);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 50% 50%, rgba(123, 77, 255, 0.44), rgba(58, 31, 112, 0.2) 46%, rgba(7, 7, 15, 0) 72%);
  filter: blur(12px);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  padding: clamp(26px, 4vw, 56px) clamp(20px, 4vw, 56px) clamp(26px, 4vw, 48px);
  border: 1px solid var(--line);
  background: linear-gradient(155deg, rgba(17, 19, 39, 0.88) 0%, rgba(7, 7, 15, 0.45) 64%, rgba(7, 7, 15, 0) 100%);
}

.page-about .about-hero__inner::before,
.page-about .about-hero__inner::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border: 1px solid var(--cyan);
  opacity: 0.7;
}

.page-about .about-hero__inner::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-hero__inner::after {
  right: -1px;
  bottom: -1px;
  border-top: 0;
  border-left: 0;
}

.page-about .about-hero h1 {
  margin: 18px 0 0;
  max-width: 16ch;
  font-family: var(--font-display);
  font-size: clamp(33px, 6vw, 74px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--white);
  background: linear-gradient(98deg, var(--white) 34%, #d9cdff 74%, var(--cyan) 132%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 64ch;
  font-size: var(--step-3);
  line-height: 1.8;
  color: rgba(247, 248, 255, 0.8);
}

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

.page-about .about-hero__marks {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(112px, 1fr));
  gap: 18px;
  max-width: 620px;
  margin: 32px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__marks dt {
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.16em;
  color: var(--paper-grey);
}

.page-about .about-hero__marks dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: var(--step-5);
  line-height: 1;
  color: var(--amber);
  letter-spacing: -0.01em;
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  position: relative;
  padding: clamp(44px, 6vw, 96px) 0;
  border-top: 1px solid var(--line);
}

.page-about .chapter__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-about .chapter__rail {
  display: flex;
  align-items: baseline;
  gap: 14px;
  font-family: var(--font-mono);
  text-transform: uppercase;
}

.page-about .chapter__num {
  font-size: 30px;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--violet);
}

.page-about .chapter__year {
  font-size: var(--step-1);
  letter-spacing: 0.22em;
  color: var(--paper-grey);
}

.page-about .chapter__title {
  margin: 0 0 20px;
  max-width: 24ch;
  font-family: var(--font-display);
  font-size: clamp(25px, 3.4vw, 42px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.01em;
}

.page-about .chapter__body p {
  max-width: 68ch;
  margin: 0 0 16px;
  font-size: var(--step-3);
  line-height: 1.78;
  color: rgba(247, 248, 255, 0.78);
}

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

.page-about .chapter__split {
  display: grid;
  gap: 28px;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 6px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--line-strong);
}

.page-about .about-figure--wide img {
  aspect-ratio: 16 / 9;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.08em;
  color: var(--paper-grey);
}

/* ---------- 三个决定 ---------- */
.page-about .chapter--dim {
  background: linear-gradient(180deg, rgba(17, 19, 39, 0.82), rgba(7, 7, 15, 0));
}

.page-about .decisions {
  display: grid;
  gap: 16px;
  margin-top: 30px;
}

.page-about .decision {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px 22px 20px;
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--radius);
  box-shadow: 0 20px 44px rgba(7, 7, 15, 0.5);
}

.page-about .decisions .decision p {
  max-width: none;
  margin: 0;
  color: rgba(7, 7, 15, 0.74);
}

.page-about .decision__no {
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.2em;
  color: var(--violet-deep);
}

.page-about .decision__title {
  margin: 0;
  font-size: var(--step-4);
  font-weight: 700;
  line-height: 1.32;
  color: var(--ink);
}

.page-about .decision__figure {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0;
  font-family: var(--font-mono);
}

.page-about .decisions .decision .decision__figure {
  margin-top: 2px;
}

.page-about .decision__figure b {
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  color: var(--violet-deep);
  letter-spacing: -0.02em;
}

.page-about .decision__figure span {
  font-size: var(--step-2);
  color: rgba(7, 7, 15, 0.58);
  letter-spacing: 0.08em;
}

.page-about .decision__more {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid rgba(7, 7, 15, 0.16);
}

.page-about .decision__more summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.12em;
  color: var(--violet-deep);
}

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

.page-about .decision__more summary::after {
  content: "+";
  font-size: var(--step-3);
  line-height: 1;
}

.page-about .decision__more[open] summary::after {
  content: "−";
}

.page-about .decision__more dl {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 8px 12px;
  margin: 14px 0 0;
  font-size: var(--step-2);
}

.page-about .decision__more dt {
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.1em;
  color: rgba(7, 7, 15, 0.5);
  padding-top: 2px;
}

.page-about .decision__more dd {
  margin: 0;
  line-height: 1.6;
  color: rgba(7, 7, 15, 0.82);
}

/* ---------- 团队（纸面章节） ---------- */
.page-about .chapter--paper {
  background: var(--paper);
  color: var(--ink);
}

.page-about .team-grid {
  display: grid;
  gap: 0;
  margin-top: 26px;
}

.page-about .team-item {
  padding: 20px 0 18px;
  border-top: 1px solid rgba(7, 7, 15, 0.18);
}

.page-about .team-item__tag {
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.2em;
  color: var(--violet-deep);
}

.page-about .team-item__title {
  margin: 8px 0 8px;
  font-size: var(--step-4);
  font-weight: 700;
  line-height: 1.3;
  color: var(--ink);
}

/* ---------- 规模 ---------- */
.page-about .chapter--figures {
  background: linear-gradient(180deg, rgba(17, 19, 39, 0.9), rgba(7, 7, 15, 0.5));
}

.page-about .figures {
  display: grid;
  gap: 20px;
  margin-top: 30px;
}

.page-about .figure-cell {
  padding-top: 14px;
  border-top: 2px solid var(--violet);
}

.page-about .figure-cell b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(32px, 4.2vw, 52px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--amber);
}

.page-about .figure-cell span {
  display: block;
  margin-top: 10px;
  font-size: var(--step-2);
  letter-spacing: 0.04em;
  color: var(--paper-grey);
}

.page-about .chapter__body .figure-note {
  margin-top: 26px;
  color: rgba(247, 248, 255, 0.66);
  font-size: var(--step-2);
  line-height: 1.8;
}

.page-about .scene-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .scene-tag {
  padding: 7px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: var(--step-2);
  letter-spacing: 0.04em;
  color: rgba(247, 248, 255, 0.86);
}

/* ---------- 唯一入口 ---------- */
.page-about .promise {
  display: grid;
  gap: 22px;
  margin-top: 28px;
  padding: 22px 20px;
  border-left: 2px solid var(--cyan);
  background: linear-gradient(100deg, rgba(57, 230, 255, 0.08), rgba(57, 230, 255, 0));
}

.page-about .promise__cell {
  display: grid;
  gap: 10px;
  justify-items: start;
}

.page-about .promise__tag {
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .chapter__body .promise__cell p {
  margin: 0;
  font-size: var(--step-2);
  line-height: 1.75;
  color: rgba(247, 248, 255, 0.74);
}

/* ---------- 年表 ---------- */
.page-about .chapter--timeline {
  isolation: isolate;
  overflow: hidden;
}

.page-about .about-timeline-bg {
  position: absolute;
  z-index: -1;
  top: 0;
  right: 0;
  width: min(760px, 72%);
  margin: 0;
  opacity: 0.3;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(to left, #000 20%, transparent 100%);
  mask-image: linear-gradient(to left, #000 20%, transparent 100%);
}

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

.page-about .timeline {
  position: relative;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 26px;
}

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

.page-about .timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--step-4);
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-about .timeline__title {
  margin: 8px 0 8px;
  font-size: var(--step-4);
  font-weight: 700;
  line-height: 1.32;
  color: var(--white);
}

.page-about .timeline__item--key .timeline__title {
  color: var(--cyan);
}

.page-about .chapter__body .timeline__body p {
  margin: 0;
  font-size: var(--step-2);
  line-height: 1.78;
  color: rgba(247, 248, 255, 0.72);
}

.page-about .timeline__more {
  margin-top: 12px;
  padding: 10px 14px;
  border: 1px solid var(--line-strong);
  background: rgba(17, 19, 39, 0.7);
}

.page-about .timeline__more summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.12em;
  color: var(--cyan);
}

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

.page-about .timeline__more summary::after {
  content: " +";
}

.page-about .timeline__more[open] summary::after {
  content: " −";
}

.page-about .timeline__more ul {
  margin: 12px 0 0;
  padding-left: 18px;
  display: grid;
  gap: 6px;
}

.page-about .timeline__more li {
  font-size: var(--step-2);
  line-height: 1.7;
  color: rgba(247, 248, 255, 0.76);
}

/* ---------- 收尾 ---------- */
.page-about .chapter--cta {
  border-top: 1px solid var(--line-strong);
  background: radial-gradient(120% 140% at 12% 0%, rgba(123, 77, 255, 0.22), rgba(7, 7, 15, 0) 62%);
}

.page-about .about-cta {
  max-width: 780px;
}

.page-about .about-cta__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.8vw, 46px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-cta__text {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: var(--step-3);
  line-height: 1.8;
  color: rgba(247, 248, 255, 0.76);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.page-about .about-cta__links a {
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.12em;
  color: var(--paper-grey);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .about-cta__links a:hover,
.page-about .about-cta__links a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 纸面章节文字覆盖 ---------- */
.page-about .chapter--paper .chapter__title {
  color: var(--ink);
}

.page-about .chapter--paper .chapter__body p {
  color: rgba(7, 7, 15, 0.76);
}

.page-about .chapter--paper .chapter__num {
  color: rgba(58, 31, 112, 0.55);
}

.page-about .chapter--paper .chapter__year {
  color: rgba(7, 7, 15, 0.45);
}

.page-about .chapter--paper .about-figure img {
  border-color: rgba(7, 7, 15, 0.22);
}

.page-about .chapter--paper .about-figure figcaption {
  color: rgba(7, 7, 15, 0.55);
}

/* ---------- 焦点可见 ---------- */
.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .figures {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 48px;
  }

  .page-about .promise {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px;
    padding: 26px 24px;
  }
}

@media (min-width: 900px) {
  .page-about .chapter__grid {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: clamp(28px, 5vw, 72px);
    align-items: start;
  }

  .page-about .chapter__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding-top: 6px;
  }

  .page-about .chapter__num {
    font-size: 38px;
  }

  .page-about .chapter__split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.68fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-about .decisions {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    align-items: stretch;
  }

  .page-about .timeline::before {
    content: "";
    position: absolute;
    left: 96px;
    top: 10px;
    bottom: 12px;
    width: 1px;
    background: linear-gradient(180deg, var(--violet), rgba(57, 230, 255, 0.4), rgba(201, 191, 174, 0.08));
  }

  .page-about .timeline__item {
    display: grid;
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 28px;
    padding-bottom: 32px;
  }

  .page-about .timeline__item::before {
    content: "";
    position: absolute;
    top: 12px;
    left: 92px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--ink);
    border: 1px solid var(--cyan);
    box-shadow: 0 0 0 4px rgba(7, 7, 15, 0.95);
  }

  .page-about .timeline__year {
    text-align: right;
    padding-right: 4px;
    font-size: var(--step-3);
    padding-top: 6px;
  }
}

@media (min-width: 1060px) {
  .page-about .figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 899px) {
  .page-about .about-timeline-bg {
    position: static;
    width: 100%;
    margin-top: 28px;
    opacity: 0.6;
    -webkit-mask-image: none;
    mask-image: none;
  }

  .page-about .about-timeline-bg img {
    aspect-ratio: 2 / 1;
  }
}

@media (max-width: 560px) {
  .page-about .about-hero__marks dd {
    font-size: var(--step-4);
  }

  .page-about .decision__figure b {
    font-size: 34px;
  }

  .page-about .decision__more dl {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .page-about .decision__more dt {
    padding-top: 8px;
  }
}
<<<PAGE_CSS_END>>>