.page-about {
  --about-rule: rgba(185, 138, 75, 0.42);
  --about-soft: rgba(11, 27, 43, 0.1);
  --about-card: #FBF8F2;
  background: var(--paper);
  color: var(--text);
}

/* ---------- 首屏题签 ---------- */
.page-about .about-hero {
  padding-top: clamp(1.5rem, 4vw, 3rem);
  padding-bottom: clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  margin-top: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-hero__title {
  margin: 0.6rem 0 0;
  font-size: clamp(1.9rem, 6.2vw, 3.5rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--ink-900);
  max-width: 17em;
}

.page-about .about-hero__lede {
  margin: clamp(1rem, 2.5vw, 1.4rem) 0 0;
  max-width: 34em;
  font-size: clamp(0.97rem, 1.6vw, 1.06rem);
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-hero__facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 2rem;
  margin: clamp(1.4rem, 4vw, 2rem) 0 0;
  padding: clamp(0.9rem, 2vw, 1.1rem) 0;
  border-top: 1px solid var(--about-rule);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 0.45rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.page-about .about-hero__facts .mono {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--ink-900);
  letter-spacing: -0.01em;
}

.page-about .about-hero__figure {
  margin: 0;
  border-left: 3px solid var(--copper);
  padding-left: clamp(0.75rem, 2vw, 1.25rem);
}

.page-about .about-hero__figure .figure__frame {
  border: 2px solid var(--ink-900);
  box-shadow: var(--hard-shadow);
  background: var(--cool);
  aspect-ratio: 3 / 2;
  overflow: hidden;
}

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

.page-about .about-hero__figure .figure__frame img,
.page-about .about-timeline__figure .figure__frame img,
.page-about .about-team__figure .figure__frame img {
  height: 100%;
}

.page-about .figure__caption {
  margin-top: 0.6rem;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 侧栏索引 + 内容流 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3.5rem);
  padding-top: clamp(1.5rem, 4vw, 2.5rem);
  padding-bottom: clamp(3rem, 7vw, 5rem);
}

.page-about .about-index__label {
  margin: 0 0 0.75rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--about-rule);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--copper);
}

.page-about .about-index ol {
  list-style: none;
  counter-reset: idx;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.25rem;
}

.page-about .about-index li {
  counter-increment: idx;
}

.page-about .about-index a {
  display: block;
  padding: 0.3rem 0;
  font-size: 0.9375rem;
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-index a::before {
  content: counter(idx, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  margin-right: 0.55rem;
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--ink-900);
  border-bottom-color: var(--copper-bright);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  margin-bottom: clamp(2.5rem, 6vw, 4.5rem);
  scroll-margin-top: calc(var(--bar-h) + 1rem);
}

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

.page-about .about-section__title {
  margin: 0.4rem 0 0.85rem;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.45rem, 4vw, 2.05rem);
  line-height: 1.35;
  letter-spacing: 0.01em;
  color: var(--ink-900);
}

.page-about .about-section__lede {
  margin: 0 0 clamp(1.25rem, 3vw, 2rem);
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 0.4rem;
  border-left: 2px solid var(--about-rule);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(1.6rem, 4vw, 2.4rem) clamp(1.15rem, 3vw, 1.9rem);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 0.55rem;
  width: 10px;
  height: 10px;
  background: var(--paper);
  border: 2px solid var(--copper);
  transform: rotate(45deg);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4.5vw, 2.1rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--copper);
  margin-bottom: 0.45rem;
}

.page-about .about-timeline__title {
  margin: 0 0 0.35rem;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--ink-900);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-timeline__item--figure::before {
  display: none;
}

.page-about .about-timeline__figure {
  margin: 0;
  max-width: 340px;
}

.page-about .about-timeline__figure .figure__frame {
  border: 2px solid var(--ink-900);
  box-shadow: var(--hard-shadow);
  background: var(--cool);
  aspect-ratio: 3 / 4;
  overflow: hidden;
}

/* ---------- 版本运营方法 ---------- */
.page-about .about-method {
  list-style: none;
  margin: 0 0 clamp(1.5rem, 4vw, 2rem);
  padding: 0;
  display: grid;
  gap: clamp(1rem, 2.5vw, 1.3rem);
}

.page-about .about-method__step {
  border-top: 3px solid var(--ink-900);
  padding-top: 0.85rem;
}

.page-about .about-method__num {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--copper);
}

.page-about .about-method__step h3 {
  margin: 0.4rem 0 0.4rem;
  font-size: 1.0625rem;
  color: var(--ink-900);
}

.page-about .about-method__step p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-counter {
  display: grid;
  gap: 1.1rem;
  padding: clamp(1.1rem, 3vw, 1.7rem);
  background: var(--ink-900);
  border: 2px solid var(--ink-900);
  box-shadow: var(--hard-shadow);
  color: var(--cool);
}

.page-about .about-counter__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 5vw, 2.6rem);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .about-counter__label {
  display: block;
  margin-top: 0.45rem;
  font-size: 0.875rem;
  line-height: 1.7;
  color: rgba(232, 237, 242, 0.8);
}

.page-about .about-fold {
  margin-top: clamp(1.25rem, 3vw, 1.75rem);
  border-top: 1px solid var(--about-rule);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-fold > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.95rem 0;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  color: var(--ink-900);
}

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

.page-about .about-fold > summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--copper);
  transition: color var(--dur) var(--ease);
}

.page-about .about-fold[open] > summary::after {
  content: "−";
  color: var(--copper-bright);
}

.page-about .about-fold__body {
  padding: 0 0 1rem;
  max-width: 64ch;
  font-size: 0.9375rem;
  line-height: 1.9;
  color: var(--text);
}

/* ---------- 团队与覆盖 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-team__bars {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
  display: grid;
  gap: 0.95rem;
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.3rem 0.75rem;
  font-size: 0.9375rem;
}

.page-about .about-team__label {
  color: var(--text);
}

.page-about .about-team__num {
  font-size: 0.85rem;
  color: var(--muted);
}

.page-about .about-team__track {
  grid-column: 1 / -1;
  display: block;
  height: 7px;
  background: var(--cool);
  border: 1px solid var(--about-soft);
}

.page-about .about-team__fill {
  display: block;
  height: 100%;
  width: var(--w, 0%);
  background: linear-gradient(90deg, var(--ink-700), var(--copper));
  transition: background var(--dur) var(--ease);
}

.page-about .about-cover {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.page-about .about-cover li {
  padding: 0.8rem 1rem;
  background: var(--cool);
  border-left: 3px solid var(--copper);
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--text);
}

.page-about .about-cover strong {
  display: inline-block;
  margin-right: 0.3rem;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--ink-900);
}

.page-about .about-team__figure {
  margin: 0;
}

.page-about .about-team__figure .figure__frame {
  border: 2px solid var(--ink-900);
  box-shadow: var(--hard-shadow);
  background: var(--cool);
  aspect-ratio: 2 / 1;
  overflow: hidden;
}

/* ---------- 适配与生态 ---------- */
.page-about .about-table-wrap {
  overflow-x: auto;
  border: 2px solid var(--ink-900);
  background: var(--about-card);
  box-shadow: var(--hard-shadow);
}

.page-about .about-fit table {
  width: 100%;
  min-width: 540px;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.page-about .about-fit caption {
  caption-side: top;
  text-align: left;
  padding: 0.8rem 0.95rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  border-bottom: 1px solid var(--about-soft);
}

.page-about .about-fit th,
.page-about .about-fit td {
  text-align: left;
  padding: 0.7rem 0.95rem;
  border-bottom: 1px solid var(--about-soft);
  vertical-align: top;
  line-height: 1.7;
}

.page-about .about-fit thead th {
  background: var(--cool);
  border-bottom: 2px solid var(--ink-900);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-weight: 500;
}

.page-about .about-fit tbody th {
  font-weight: 600;
  color: var(--ink-900);
  white-space: nowrap;
}

.page-about .about-fit tbody tr:last-child th,
.page-about .about-fit tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .about-fit__note {
  margin: clamp(1.1rem, 3vw, 1.6rem) 0 0;
  max-width: 62ch;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--text);
  padding-left: 0.95rem;
  border-left: 3px solid var(--copper);
}

/* ---------- 荣誉与检查 ---------- */
.page-about .about-honor {
  display: grid;
  gap: 0.75rem;
  padding: clamp(1.1rem, 3vw, 1.6rem);
  border: 2px solid var(--copper);
  background: var(--about-card);
  margin-bottom: clamp(1.5rem, 4vw, 2rem);
}

.page-about .about-honor__quote {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(1rem, 2.4vw, 1.15rem);
  line-height: 1.8;
  color: var(--ink-900);
}

.page-about .about-honor__meta {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .about-checks {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.1rem;
}

.page-about .about-checks li {
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr);
  gap: 0.75rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-checks__num {
  font-size: 1.05rem;
  color: var(--copper);
  line-height: 1.5;
}

.page-about .about-checks h3 {
  margin: 0 0 0.3rem;
  font-size: 1rem;
  color: var(--ink-900);
}

.page-about .about-checks p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  display: grid;
  gap: 0.9rem;
}

.page-about .about-next__item {
  display: block;
  padding: 1.05rem 1.15rem;
  border: 2px solid var(--ink-900);
  background: var(--paper);
  color: var(--text);
  text-decoration: none;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-next__item strong {
  display: block;
  margin-bottom: 0.3rem;
  font-size: 1.0625rem;
  color: var(--ink-900);
}

.page-about .about-next__item span {
  display: block;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-next__item:hover,
.page-about .about-next__item:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: var(--hard-shadow);
  border-color: var(--copper);
}

.page-about .about-next__contact {
  margin: clamp(1.2rem, 3vw, 1.6rem) 0 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-next__contact .mono {
  color: var(--ink-900);
  word-break: break-all;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 5.5rem minmax(0, 1fr);
    column-gap: clamp(1rem, 2.5vw, 1.75rem);
  }

  .page-about .about-timeline__year {
    margin-bottom: 0;
  }

  .page-about .about-timeline__item--figure {
    display: block;
  }

  .page-about .about-counter {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: end;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

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

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: 190px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 2rem;
  }

  .page-about .about-index ol {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
  }

  .page-about .about-index a {
    font-size: 0.9rem;
  }
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index a,
  .page-about .about-team__fill,
  .page-about .about-next__item,
  .page-about .about-fold > summary::after {
    transition: none;
  }

  .page-about .about-next__item:hover,
  .page-about .about-next__item:focus-visible {
    transform: none;
  }
}
<<<END>>>

.page-about {
  --w: 1rem;
}