.page-about {
  --about-shell: 48rem;
  --about-fill-ops: 53%;
  --about-fill-edit: 29%;
  --about-fill-link: 18%;
  padding-block: clamp(1.6rem, 5vw, 3.5rem) clamp(3rem, 8vw, 6.5rem);
  background:
    radial-gradient(110% 48% at 50% -6%, rgba(36, 224, 224, 0.10), transparent 62%),
    radial-gradient(80% 40% at 100% 30%, rgba(255, 90, 31, 0.05), transparent 70%),
    var(--ds-night);
  color: var(--ds-ice);
  overflow-x: clip;
}

.page-about .about-shell {
  width: 100%;
  max-width: var(--about-shell);
  margin-inline: auto;
  padding-inline: var(--ds-gutter);
}

/* 首屏 */
.page-about .about-hero {
  padding-bottom: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .about-hero .ds-breadcrumb {
  margin-bottom: clamp(1.4rem, 4vw, 2.2rem);
}

.page-about .about-hero .ds-eyebrow {
  margin: 0 0 0.7rem;
  color: var(--ds-cyan);
}

.page-about .about-hero__title {
  margin: 0 0 1rem;
  font-family: var(--ds-font-display);
  font-size: clamp(2rem, 7vw, 3.4rem);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--ds-ice);
}

.page-about .about-hero__lede {
  max-width: 34em;
  margin: 0 0 clamp(1.6rem, 4vw, 2.4rem);
  font-size: 1.06rem;
  line-height: 1.85;
  color: rgba(232, 237, 247, 0.82);
}

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

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.9rem 1rem;
  background: var(--ds-night);
}

.page-about .about-hero__facts .ds-num {
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--ds-ice);
}

.page-about .about-hero__facts em {
  font-style: normal;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--ds-mist);
}

/* 章节导航 */
.page-about .about-toc {
  border-top: 1px solid var(--ds-line);
  border-bottom: 1px solid var(--ds-line);
  padding-block: 0.75rem;
  margin-bottom: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .about-toc ol {
  display: flex;
  gap: 0.45rem;
  margin: 0;
  padding: 0 0 0.15rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc a {
  display: inline-block;
  white-space: nowrap;
  padding: 0.32rem 0.7rem;
  border: 1px solid var(--ds-line);
  border-radius: 999px;
  font-family: var(--ds-font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--ds-mist);
  text-decoration: none;
  transition: color 0.18s var(--ds-ease), border-color 0.18s var(--ds-ease), background-color 0.18s var(--ds-ease);
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--ds-cyan);
  border-color: var(--ds-cyan);
  background: var(--ds-cyan-soft);
}

/* 章节骨架 */
.page-about .about-chapter {
  padding-block: clamp(2rem, 5.5vw, 3.4rem);
  border-top: 1px solid var(--ds-line);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-chapter__head {
  margin-bottom: clamp(1.2rem, 3.5vw, 1.8rem);
}

.page-about .about-chapter__num {
  display: block;
  margin-bottom: 0.35rem;
  font-family: var(--ds-font-mono);
  font-size: clamp(2.8rem, 11vw, 4.6rem);
  font-weight: 700;
  line-height: 0.92;
  letter-spacing: -0.05em;
  color: var(--ds-indigo-lift);
  -webkit-text-stroke: 1.4px rgba(36, 224, 224, 0.42);
}

.page-about .about-chapter__title {
  margin: 0 0 0.6rem;
  font-family: var(--ds-font-display);
  font-size: clamp(1.5rem, 4.4vw, 2.2rem);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--ds-ice);
}

.page-about .about-chapter__sum {
  max-width: 34em;
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ds-mist);
}

.page-about .about-chapter__text {
  max-width: 34em;
}

.page-about .about-chapter__text p {
  margin: 0 0 1.1em;
  font-size: 1.02rem;
  line-height: 1.9;
  color: rgba(232, 237, 247, 0.86);
}

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

.page-about .about-chapter__text a {
  color: var(--ds-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(36, 224, 224, 0.4);
}

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

.page-about .about-subtitle {
  margin: 0;
  font-family: var(--ds-font-display);
  font-size: 1.08rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ds-ice);
}

/* 第一章 图文 */
.page-about .about-split {
  display: grid;
  gap: 1.5rem;
  margin-bottom: clamp(1.8rem, 5vw, 2.8rem);
}

.page-about .about-split__media {
  margin: 0;
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid var(--ds-line);
}

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

/* 时间轴 */
.page-about .about-timeline-wrap {
  padding-top: clamp(1.2rem, 3.5vw, 1.8rem);
  border-top: 1px dashed var(--ds-line);
}

.page-about .about-timeline-head {
  display: grid;
  gap: 0.9rem;
  margin-bottom: 1.4rem;
}

.page-about .about-timeline {
  margin: 0;
  padding: 0 0 0 1.35rem;
  list-style: none;
  border-left: 1px solid var(--ds-line-strong);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 1.6rem;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -1.35rem;
  top: 0.5rem;
  width: 7px;
  height: 7px;
  margin-left: -4px;
  border-radius: 50%;
  background: var(--ds-cyan);
}

.page-about .about-timeline__tag {
  display: inline-block;
  margin-bottom: 0.35rem;
  font-family: var(--ds-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--ds-amber);
}

.page-about .about-timeline__item h4 {
  margin: 0 0 0.35rem;
  font-family: var(--ds-font-display);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--ds-ice);
}

.page-about .about-timeline__item p {
  max-width: 34em;
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--ds-mist);
}

/* 数据链路 */
.page-about .about-flow {
  margin: clamp(1.6rem, 4.5vw, 2.4rem) 0;
  padding: clamp(1rem, 3vw, 1.6rem);
  border: 1px solid var(--ds-line);
  border-radius: 4px;
  background: linear-gradient(180deg, rgba(22, 34, 77, 0.5), rgba(14, 22, 51, 0.35));
}

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

.page-about .about-flow__label {
  display: none;
  fill: var(--ds-mist);
  font-family: var(--ds-font-body);
  font-size: 15px;
}

.page-about .about-flow__label--join {
  fill: var(--ds-cyan);
  font-size: 14px;
  letter-spacing: 0.06em;
}

.page-about .about-flow__line {
  fill: none;
  stroke: var(--ds-quiet);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-dasharray: 1;
  stroke-dashoffset: 0;
}

.page-about .about-flow__line--out {
  stroke: rgba(36, 224, 224, 0.55);
}

.page-about .about-flow__node {
  fill: var(--ds-quiet);
}

.page-about .about-flow__join {
  fill: var(--ds-cyan);
}

.page-about .about-flow__out {
  fill: var(--ds-amber);
}

.page-about [data-reveal].is-in .about-flow__line {
  animation: about-draw 1.3s var(--ds-ease) both;
}

.page-about [data-reveal].is-in .about-flow__join,
.page-about [data-reveal].is-in .about-flow__out {
  animation: about-pulse 1.6s var(--ds-ease) 1.1s 3;
}

@keyframes about-draw {
  from { stroke-dashoffset: 1; }
  to { stroke-dashoffset: 0; }
}

@keyframes about-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.page-about .about-flow__legend {
  display: grid;
  gap: 0.5rem;
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow__legend li {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.86rem;
  color: var(--ds-mist);
}

.page-about .about-flow__dot {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ds-quiet);
}

.page-about .about-flow__dot--join {
  background: var(--ds-cyan);
}

.page-about .about-flow__dot--c {
  background: rgba(36, 224, 224, 0.5);
}

.page-about .about-flow__caption {
  margin-top: 0.9rem;
  padding-top: 0.8rem;
  border-top: 1px solid var(--ds-line);
  font-size: 0.82rem;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--ds-mist);
}

.page-about .about-inline-media {
  margin: clamp(1.6rem, 4.5vw, 2.4rem) 0;
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid var(--ds-line);
}

/* 规模数字 */
.page-about .about-figures {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ds-line);
}

.page-about .about-figures__row {
  display: grid;
  gap: 0.4rem;
  padding-block: 1.1rem;
  border-bottom: 1px solid var(--ds-line);
}

.page-about .about-figures__value {
  font-family: var(--ds-font-mono);
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  color: var(--ds-cyan);
}

.page-about .about-figures__value .ds-num {
  font-size: 1.9rem;
  font-weight: 700;
  line-height: 1;
  color: var(--ds-ice);
}

.page-about .about-figures__desc {
  max-width: 34em;
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--ds-mist);
}

.page-about .about-figures__desc a {
  color: var(--ds-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(36, 224, 224, 0.4);
}

/* 团队 */
.page-about .about-team {
  margin: clamp(1.4rem, 4vw, 2rem) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1.1rem;
}

.page-about .about-team__item {
  padding: 1rem 1.1rem;
  border: 1px solid var(--ds-line);
  border-left: 2px solid var(--ds-cyan);
  border-radius: 4px;
  background: rgba(14, 22, 51, 0.55);
}

.page-about .about-team__meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.65rem;
}

.page-about .about-team__name {
  font-family: var(--ds-font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--ds-ice);
}

.page-about .about-team__count {
  font-family: var(--ds-font-mono);
  font-size: 0.84rem;
  letter-spacing: 0.04em;
  color: var(--ds-mist);
}

.page-about .about-team__count .ds-num {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--ds-ice);
}

.page-about .about-team__track {
  height: 6px;
  border-radius: 999px;
  background: var(--ds-quiet);
  overflow: hidden;
}

.page-about .about-team__fill {
  display: block;
  height: 100%;
  width: var(--w, 0);
  border-radius: 999px;
  background: linear-gradient(90deg, var(--ds-cyan-press), var(--ds-cyan));
}

.page-about .about-team__fill--ops { --w: var(--about-fill-ops); }
.page-about .about-team__fill--edit { --w: var(--about-fill-edit); }
.page-about .about-team__fill--link { --w: var(--about-fill-link); }

.page-about .about-team__note {
  margin: 0.6rem 0 0;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--ds-mist);
}

/* 合作生态 */
.page-about .about-eco {
  display: grid;
  gap: 1rem;
  margin-top: clamp(1.4rem, 4vw, 2rem);
}

.page-about .about-eco__card {
  padding: 1.2rem 1.15rem;
  border-radius: 4px;
  background: rgba(22, 34, 77, 0.62);
  border: 1px solid var(--ds-line);
}

.page-about .about-eco__card .ds-chip {
  margin-bottom: 0.7rem;
}

.page-about .about-eco__card h3 {
  margin: 0 0 0.5rem;
  font-family: var(--ds-font-display);
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ds-ice);
}

.page-about .about-eco__card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--ds-mist);
}

.page-about .about-honors {
  margin-top: clamp(1.6rem, 4.5vw, 2.4rem);
  padding-top: clamp(1.2rem, 3.5vw, 1.8rem);
  border-top: 1px dashed var(--ds-line);
}

.page-about .about-honors__list {
  display: grid;
  gap: 0.75rem;
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-honors__list li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.95rem;
  line-height: 1.7;
  color: rgba(232, 237, 247, 0.84);
}

/* 下一步 */
.page-about .about-next__list {
  display: grid;
  gap: 1.1rem;
  margin: 0 0 clamp(1.8rem, 5vw, 2.6rem);
  padding: 0;
  list-style: none;
  counter-reset: about-next;
}

.page-about .about-next__list li {
  position: relative;
  padding-left: 2.6rem;
  counter-increment: about-next;
}

.page-about .about-next__list li::before {
  content: counter(about-next, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.1rem;
  font-family: var(--ds-font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ds-signal);
}

.page-about .about-next__list h3 {
  margin: 0 0 0.35rem;
  font-family: var(--ds-font-display);
  font-size: 1.04rem;
  font-weight: 700;
  color: var(--ds-ice);
}

.page-about .about-next__list p {
  max-width: 34em;
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--ds-mist);
}

.page-about .about-next__list a {
  color: var(--ds-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(36, 224, 224, 0.4);
}

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

.page-about .about-outro {
  padding: clamp(1.2rem, 3.5vw, 1.8rem);
  border: 1px solid var(--ds-line);
  border-left: 2px solid var(--ds-signal);
  border-radius: 4px;
  background: linear-gradient(120deg, rgba(14, 22, 51, 0.85), rgba(22, 34, 77, 0.45));
}

.page-about .about-outro p {
  max-width: 34em;
  margin: 0 0 1.1rem;
  font-size: 0.98rem;
  line-height: 1.85;
  color: rgba(232, 237, 247, 0.86);
}

.page-about .about-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.page-about .about-outro__actions .ds-btn {
  text-decoration: none;
}

.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--ds-cyan);
  outline-offset: 2px;
}

/* 断点 */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-toc ol {
    flex-wrap: wrap;
    overflow-x: visible;
  }

  .page-about .about-figures__row {
    grid-template-columns: 8.5rem minmax(0, 1fr);
    align-items: baseline;
    gap: 0.4rem 1.5rem;
  }

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

@media (min-width: 780px) {
  .page-about .about-flow__label {
    display: block;
  }

  .page-about .about-flow__legend {
    display: none;
  }
}

@media (min-width: 900px) {
  .page-about .about-chapter__head {
    display: grid;
    grid-template-columns: 5.5rem minmax(0, 1fr);
    column-gap: 1.6rem;
    align-items: start;
  }

  .page-about .about-chapter__num {
    grid-row: 1 / span 3;
    margin-bottom: 0;
    font-size: clamp(3.4rem, 6vw, 4.6rem);
  }

  .page-about .about-chapter__title,
  .page-about .about-chapter__sum {
    grid-column: 2;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) 16rem;
    gap: 2.4rem;
    align-items: start;
  }

  .page-about .about-split__media {
    margin-top: 0.4rem;
  }
}

@media (min-width: 1100px) {
  .page-about {
    --about-shell: 52rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation: none !important;
    transition: none !important;
  }
}