.page-about {
  --about-rule: rgba(35, 26, 18, .16);
  --about-hair: rgba(183, 194, 216, .22);
  --about-cut: 18px;
  background: var(--paper);
  color: var(--brown);
  overflow-x: hidden;
}

.page-about .content-shell {
  width: var(--shell);
  margin-inline: auto;
}

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

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin: 0 0 1.6rem;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .12em;
  color: var(--silver);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: .4rem;
  color: rgba(183, 194, 216, .5);
}

.page-about .breadcrumb a {
  color: var(--silver);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 1.9rem 0 3rem;
  background:
    radial-gradient(circle at 88% 8%, rgba(122, 92, 255, .28), transparent 55%),
    linear-gradient(160deg, var(--ink) 0%, var(--ink-deep) 100%);
  color: var(--paper);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto -12% -35% auto;
  width: 62%;
  height: 130%;
  background: repeating-linear-gradient(115deg, rgba(53, 242, 208, .18) 0 1px, transparent 1px 28px);
  pointer-events: none;
}

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

.page-about .about-hero .eyebrow {
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  margin: 0 0 .9rem;
}

.page-about .hero-grid {
  display: grid;
  gap: 2rem;
}

.page-about .about-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 7.6vw, 4rem);
  line-height: 1.02;
  letter-spacing: -.02em;
  margin: 0 0 1.2rem;
  color: var(--paper-hi);
  max-width: 15em;
}

.page-about .about-lede {
  margin: 0 0 1.7rem;
  max-width: 34em;
  font-size: .98rem;
  line-height: 1.78;
  color: rgba(242, 232, 213, .82);
}

.page-about .hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem 2rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--about-hair);
}

.page-about .fact {
  min-width: 6.4rem;
}

.page-about .fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .fact__label {
  display: block;
  margin-top: .25rem;
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--silver);
}

.page-about .hero-figure {
  position: relative;
  margin: 0;
}

.page-about .hero-figure .media-frame {
  border: 1px solid var(--about-hair);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .version-plate {
  position: absolute;
  left: .9rem;
  bottom: .9rem;
  display: flex;
  align-items: baseline;
  gap: .5rem;
  padding: .45rem .75rem;
  background: rgba(8, 18, 43, .88);
  border: 1px solid rgba(53, 242, 208, .45);
}

.page-about .version-plate__num {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--cyan);
}

.page-about .version-plate__label {
  font-size: .68rem;
  letter-spacing: .12em;
  color: var(--silver);
}

/* ---------- 档案长卷 ---------- */

.page-about .about-file {
  padding: 2.4rem 0 3.4rem;
  background: var(--paper);
  color: var(--brown);
}

.page-about .about-body {
  display: grid;
  gap: 1.2rem;
}

.page-about .about-index {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  padding-bottom: .6rem;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-index a {
  display: inline-flex;
  align-items: baseline;
  gap: .34rem;
  padding: .3rem .55rem;
  border: 1px solid var(--about-rule);
  text-decoration: none;
  color: var(--brown);
  font-size: .78rem;
  letter-spacing: .06em;
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  border-color: var(--ember);
  color: var(--ember);
}

.page-about .ix-num {
  font-family: var(--font-mono);
  font-size: .7rem;
  color: var(--ember);
}

.page-about .chapter {
  padding: 2.1rem 0;
  border-bottom: 1px solid var(--about-rule);
  scroll-margin-top: 6rem;
}

.page-about .chapter--last {
  border-bottom: 0;
  padding-bottom: .6rem;
}

.page-about .chapter-head {
  display: flex;
  align-items: baseline;
  gap: .8rem;
  margin-bottom: 1.1rem;
}

.page-about .chapter-num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--ember);
  padding-top: .35rem;
}

.page-about .chapter h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 5vw, 2.15rem);
  line-height: 1.16;
  letter-spacing: -.015em;
  color: var(--ink);
}

.page-about .chapter-main p {
  margin: 0 0 1rem;
  font-size: .97rem;
  line-height: 1.8;
  color: rgba(35, 26, 18, .86);
}

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

.page-about .chapter-main a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: rgba(217, 72, 47, .55);
  text-underline-offset: .18em;
}

.page-about .chapter-main a:hover {
  color: var(--ember);
  text-decoration-color: var(--ember);
}

.page-about .chapter-lead {
  margin: 0 0 1.5rem;
  max-width: 42em;
  font-size: 1rem;
  line-height: 1.78;
  color: rgba(35, 26, 18, .72);
}

.page-about .chapter-tail {
  margin: 1.4rem 0 0;
  font-size: .92rem;
  line-height: 1.7;
  color: rgba(35, 26, 18, .7);
}

.page-about .chapter-tail a {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: .18em;
}

.page-about .chapter-cols {
  display: grid;
  gap: 1.4rem;
}

.page-about .chapter-aside {
  min-width: 0;
}

.page-about .about-note {
  background: var(--panel);
  color: var(--paper);
  padding: 1.2rem 1.1rem 1.3rem;
  border-left: 3px solid var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-note__title {
  margin: 0 0 .9rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--cyan);
}

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

.page-about .about-note__list li {
  font-size: .86rem;
  line-height: 1.6;
  color: rgba(242, 232, 213, .82);
  border-top: 1px solid rgba(183, 194, 216, .18);
  padding-top: .7rem;
}

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

.page-about .about-note__list span {
  display: block;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--paper-hi);
  letter-spacing: -.01em;
  margin-bottom: .15rem;
}

/* ---------- 团队目录卡 ---------- */

.page-about .team-grid {
  display: grid;
  gap: .9rem;
  margin-bottom: 1.6rem;
}

.page-about .team-item {
  position: relative;
  padding: 1.1rem 1.05rem 1.2rem;
  background: var(--paper-hi);
  border: 1px solid var(--about-rule);
  border-top: 3px solid var(--ink);
}

.page-about .team-item:nth-child(2) {
  border-top-color: var(--cyan);
}

.page-about .team-item:nth-child(3) {
  border-top-color: var(--orange);
}

.page-about .team-item:nth-child(4) {
  border-top-color: var(--violet);
}

.page-about .team-item__code {
  display: block;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .18em;
  color: rgba(35, 26, 18, .5);
  margin-bottom: .45rem;
}

.page-about .team-item h3 {
  margin: 0 0 .5rem;
  font-family: var(--font-display);
  font-size: 1.02rem;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .team-item p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.72;
  color: rgba(35, 26, 18, .78);
}

.page-about .chapter-figure {
  margin: 0 0 1.2rem;
}

.page-about .chapter-figure .media-frame {
  border: 1px solid var(--about-rule);
}

.page-about .chapter-cols--reverse .chapter-figure {
  margin-bottom: 1.3rem;
}

/* ---------- 流程步骤 ---------- */

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

.page-about .flow-step {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: .9rem;
  padding: .95rem 0;
  border-top: 1px dashed rgba(35, 26, 18, .22);
}

.page-about .flow-step:last-child {
  border-bottom: 1px dashed rgba(35, 26, 18, .22);
}

.page-about .flow-step__time {
  font-family: var(--font-mono);
  font-size: .74rem;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--ember);
  padding-top: .2rem;
}

.page-about .flow-step h3 {
  margin: 0 0 .3rem;
  font-size: .98rem;
  font-family: var(--font-body);
  font-weight: 700;
  color: var(--ink);
}

.page-about .flow-step p {
  margin: 0;
  font-size: .89rem;
  line-height: 1.7;
  color: rgba(35, 26, 18, .76);
}

/* ---------- 版本时间线 ---------- */

.page-about .version-banner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .4rem .9rem;
  padding: .9rem 1rem;
  margin-bottom: 1.4rem;
  background: var(--ink);
  color: var(--paper);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .version-banner__num {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 9vw, 3.4rem);
  font-weight: 600;
  line-height: .9;
  letter-spacing: -.03em;
  color: var(--cyan);
}

.page-about .version-banner__text {
  font-size: .82rem;
  line-height: 1.5;
  color: rgba(242, 232, 213, .84);
}

.page-about .timeline {
  position: relative;
  padding-left: 1rem;
  border-left: 1px solid var(--about-rule);
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 0;
  bottom: 0;
  width: 5px;
  background: repeating-linear-gradient(to bottom, var(--ember) 0 1px, transparent 1px 14px);
  opacity: .55;
}

.page-about .tl-item {
  border-bottom: 1px solid var(--about-rule);
  padding: .85rem 0;
}

.page-about .tl-item > summary {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr) 18px;
  align-items: baseline;
  gap: .7rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-item > summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--ember);
  text-align: right;
}

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

.page-about .tl-year {
  font-family: var(--font-mono);
  font-size: .76rem;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--ink);
}

.page-about .tl-title {
  font-size: .95rem;
  font-weight: 600;
  line-height: 1.5;
  color: rgba(35, 26, 18, .9);
}

.page-about .tl-item > summary:hover .tl-title {
  color: var(--ember);
}

.page-about .tl-body {
  padding: .55rem 0 .2rem;
}

.page-about .tl-body p {
  margin: 0;
  font-size: .89rem;
  line-height: 1.76;
  color: rgba(35, 26, 18, .76);
}

/* ---------- 合作生态 ---------- */

.page-about .partner-grid {
  display: grid;
  gap: 1.3rem;
}

.page-about .partner-stats {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  margin: 1.2rem 0 .2rem;
}

.page-about .partner-stat {
  flex: 1 1 6rem;
  padding: .7rem .8rem;
  background: var(--paper-hi);
  border-left: 2px solid var(--cyan);
}

.page-about .partner-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -.02em;
}

.page-about .partner-stat__label {
  display: block;
  margin-top: .2rem;
  font-size: .72rem;
  letter-spacing: .08em;
  color: rgba(35, 26, 18, .62);
}

.page-about .partner-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  margin: 1.3rem 0 0;
}

.page-about .btn {
  display: inline-block;
  padding: .62rem 1.05rem;
  font-size: .86rem;
  font-weight: 600;
  letter-spacing: .02em;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 0;
}

.page-about .btn--ink {
  background: var(--ink);
  color: var(--paper-hi);
  border-color: var(--ink);
}

.page-about .btn--ink:hover {
  background: var(--panel);
  border-color: var(--panel);
}

.page-about .btn--solid {
  background: var(--orange);
  color: var(--ink-deep);
  border-color: var(--orange);
}

.page-about .btn--solid:hover {
  filter: brightness(1.08);
}

.page-about .btn--ghost.btn--on-paper {
  background: transparent;
  color: var(--ink);
  border-color: rgba(8, 18, 43, .45);
}

.page-about .btn--ghost.btn--on-paper:hover {
  border-color: var(--ember);
  color: var(--ember);
}

/* ---------- 服务原则 ---------- */

.page-about .principles {
  display: grid;
  gap: .9rem;
}

.page-about .principle {
  padding: .95rem 1rem;
  background: var(--paper-hi);
  border: 1px solid var(--about-rule);
  border-left: 3px solid var(--ink);
}

.page-about .principle:nth-child(2) {
  border-left-color: var(--orange);
}

.page-about .principle:nth-child(3) {
  border-left-color: var(--cyan);
}

.page-about .principle h3 {
  margin: 0 0 .4rem;
  font-family: var(--font-display);
  font-size: .98rem;
  color: var(--ink);
}

.page-about .principle p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.72;
  color: rgba(35, 26, 18, .78);
}

.page-about .about-cta {
  margin-top: 1.5rem;
  padding: 1.2rem 1.1rem;
  background: var(--ink);
  color: var(--paper);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-cta p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.72;
  color: rgba(242, 232, 213, .84);
}

.page-about .about-cta__row {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  margin-top: 1rem;
}

.page-about .about-cta .btn--ink {
  background: transparent;
  color: var(--paper-hi);
  border-color: rgba(183, 194, 216, .5);
}

.page-about .about-cta .btn--ink:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

/* ---------- 断点 ---------- */

@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 2.4rem 0 3.6rem;
  }

  .page-about .about-lede {
    font-size: 1.02rem;
  }

  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: 2.4rem;
    align-items: start;
  }

  .page-about .hero-figure {
    margin-top: 2.2rem;
  }

  .page-about .about-file {
    padding: 3rem 0 4rem;
  }

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

  .page-about .chapter-cols {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, .68fr);
    gap: 2rem;
    align-items: start;
  }

  .page-about .chapter-aside {
    margin-top: 1.6rem;
  }

  .page-about .chapter-cols--reverse {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
  }

  .page-about .chapter-cols--reverse .chapter-figure {
    margin-bottom: 0;
  }

  .page-about .partner-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    gap: 2rem;
    align-items: start;
  }

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

  .page-about .tl-item > summary {
    grid-template-columns: 88px minmax(0, 1fr) 20px;
  }
}

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 8.5rem;
    display: grid;
    gap: .35rem;
    padding-bottom: 0;
    border-bottom: 0;
    border-left: 1px solid var(--about-rule);
  }

  .page-about .about-index a {
    display: flex;
    align-items: baseline;
    padding: .3rem 0 .3rem .7rem;
    border: 0;
    border-left: 2px solid transparent;
    margin-left: -1px;
  }

  .page-about .about-index a:hover {
    border-left-color: var(--ember);
  }

  .page-about .chapter {
    padding: 2.6rem 0;
  }

  .page-about .chapter-head {
    gap: 1.1rem;
  }

  .page-about .chapter h2 {
    font-size: 2.2rem;
    max-width: 22em;
  }

  .page-about .chapter-main p {
    font-size: 1rem;
  }

  .page-about .version-banner {
    padding: 1.1rem 1.3rem;
  }

  .page-about .timeline {
    padding-left: 1.4rem;
  }
}
<<<END>>>