.page-about {
  --ab-line: rgba(14, 43, 36, .16);
  --ab-line-soft: rgba(14, 43, 36, .08);
  --ab-line-light: rgba(244, 239, 228, .16);
  --ab-ink-soft: rgba(14, 43, 36, .78);
  --ab-paper-soft: rgba(244, 239, 228, .74);
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
}

.page-about p {
  margin: 0 0 14px;
  line-height: 1.8;
  font-size: 15.5px;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(18px, 3vw, 28px) 0 clamp(40px, 7vw, 84px);
  background:
    repeating-linear-gradient(180deg, transparent 0 26px, rgba(200, 255, 61, .045) 26px 27px),
    var(--ink);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(to right, rgba(244, 239, 228, .06) 1px, transparent 1px);
  background-size: 96px 100%;
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  align-items: end;
}

.page-about .about-hero .eyebrow {
  color: var(--lime);
  letter-spacing: .14em;
}

.page-about .about-hero .title-xl {
  margin: 10px 0 18px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2rem, 7vw, 3.6rem);
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-hero .lead {
  max-width: 34em;
  color: var(--ab-paper-soft);
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(22px, 3vw, 32px);
  background: var(--ab-line-light);
  border-top: 1px solid var(--ab-line-light);
  border-bottom: 1px solid var(--ab-line-light);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 10px;
  background: var(--ink);
}

.page-about .about-fact__label {
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--mute);
}

.page-about .about-fact__value {
  font-family: var(--font-mono);
  font-size: 17px;
  letter-spacing: .04em;
  color: var(--paper);
}

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

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - 44px) 0, 100% 44px, 100% 100%, 0 100%);
  filter: saturate(.85) contrast(1.05);
}

.page-about .about-hero__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--mute);
}

/* ---------- 档案主体 ---------- */
.page-about .about-deck {
  background: var(--paper);
  color: var(--ink);
  border-top: 2px solid var(--lime);
}

.page-about .about-deck__grid {
  display: grid;
  gap: 0;
  padding-top: clamp(26px, 4vw, 48px);
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-about .about-index {
  border-bottom: 1px solid var(--ab-line);
  padding-bottom: 14px;
  margin-bottom: 8px;
}

.page-about .about-index__cap {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--mute);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 8px;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 5px 9px;
  border: 1px solid var(--ab-line);
  color: var(--ink);
  text-decoration: none;
  font-size: 13px;
  transition: background .16s ease, border-color .16s ease, color .16s ease;
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .1em;
  color: var(--mute);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  background: var(--lime);
  border-color: var(--lime-ink);
  color: var(--lime-ink);
}

.page-about .about-index__link:hover .about-index__num,
.page-about .about-index__link:focus-visible .about-index__num {
  color: var(--lime-ink);
}

.page-about .about-index__foot {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--ink);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-index__foot span {
  color: var(--mute);
}

/* ---------- 章节 ---------- */
.page-about .achapter {
  padding: clamp(28px, 4vw, 46px) 0;
  border-top: 1px solid var(--ab-line-soft);
}

.page-about .about-chapters > .achapter:first-child {
  border-top: 0;
  padding-top: 8px;
}

.page-about .achapter__head {
  margin-bottom: 16px;
}

.page-about .achapter .spec-tag {
  display: inline-block;
  border: 1px solid var(--ab-line);
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .12em;
  color: var(--mute);
}

.page-about .achapter__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.38rem, 3.4vw, 2rem);
  line-height: 1.26;
  letter-spacing: -.01em;
  max-width: 20em;
}

.page-about .achapter > p {
  color: var(--ab-ink-soft);
  max-width: 36em;
}

.page-about .achapter__note {
  margin-top: 16px;
  padding-left: 14px;
  border-left: 3px solid var(--lime);
  color: var(--ink) !important;
  font-size: 15px;
}

/* 深色章节 */
.page-about .achapter--dark {
  background: var(--ink);
  color: var(--paper);
  border-top: 0;
  padding: clamp(26px, 4vw, 40px) clamp(16px, 3vw, 30px);
  margin: clamp(18px, 3vw, 30px) 0;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .achapter--dark .spec-tag {
  border-color: var(--ab-line-light);
  color: var(--mute);
}

.page-about .achapter--dark .achapter__title {
  color: var(--paper);
}

.page-about .achapter--dark p {
  color: var(--ab-paper-soft);
}

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

/* ---------- 版本时间轴 ---------- */
.page-about .vtl {
  list-style: none;
  margin: 24px 0 6px;
  padding: 0 0 0 24px;
  position: relative;
}

.page-about .vtl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--lime), rgba(200, 255, 61, .12));
}

.page-about .vnode {
  position: relative;
  padding: 2px 0 22px;
  outline: none;
}

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

.page-about .vnode::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 10px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(200, 255, 61, .14);
  transition: transform .16s ease, box-shadow .16s ease;
}

.page-about .vnode:hover::before,
.page-about .vnode:focus-within::before,
.page-about .vnode:focus::before {
  transform: scale(1.3);
  box-shadow: 0 0 0 6px rgba(200, 255, 61, .2);
}

.page-about .vnode:focus-visible {
  box-shadow: 0 0 0 2px var(--lime);
  box-shadow: 0 0 0 2px var(--lime);
  outline: 2px solid var(--lime);
  outline-offset: 4px;
}

.page-about .vnode__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  padding: 3px 10px;
  background: var(--lime);
  color: var(--lime-ink);
  clip-path: polygon(0 0, calc(100% - 7px) 0, 100% 7px, 100% 100%, 0 100%);
}

.page-about .vnode__title {
  margin: 8px 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .vnode__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ab-paper-soft);
  max-width: 32em;
}

.page-about .vnode__extra {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--teal);
  border-left: 2px solid var(--teal);
  padding-left: 0;
  transition: max-height .2s ease, opacity .2s ease, padding .2s ease, margin .2s ease;
}

.page-about .vnode:hover .vnode__extra,
.page-about .vnode:focus-within .vnode__extra,
.page-about .vnode:focus .vnode__extra {
  max-height: 140px;
  opacity: 1;
  margin-top: 8px;
  padding-left: 10px;
}

/* ---------- 图文容器 ---------- */
.page-about .about-figure {
  margin: clamp(20px, 3vw, 30px) 0 0;
}

.page-about .about-figure__frame {
  position: relative;
  background:
    linear-gradient(to right, rgba(95, 211, 196, .12) 1px, transparent 1px) 0 0 / 40px 100%,
    linear-gradient(to bottom, rgba(95, 211, 196, .12) 1px, transparent 1px) 0 0 / 100% 40px,
    var(--panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
  overflow: hidden;
}

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

.page-about .about-figure__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--mute);
}

/* ---------- 流程 ---------- */
.page-about .flow {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}

.page-about .flow__step {
  position: relative;
  padding: 16px 16px 18px;
  background: rgba(255, 255, 255, .58);
  border: 1px solid var(--ab-line);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
  transition: transform .16s ease, border-color .16s ease, background .16s ease;
}

.page-about .flow__step:hover {
  transform: translateY(-3px);
  border-color: var(--lime);
  background: #fff;
}

.page-about .flow__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  padding: 2px 7px;
  background: var(--ink);
  color: var(--lime);
}

.page-about .flow__title {
  margin: 10px 0 6px;
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .flow__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ab-ink-soft);
}

/* ---------- 团队折叠 ---------- */
.page-about .team {
  margin-top: 18px;
  border-bottom: 1px solid var(--ab-line);
}

.page-about .team-fold {
  border-top: 1px solid var(--ab-line);
}

.page-about .team-fold summary {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 15.5px;
  font-weight: 700;
  color: var(--ink);
  transition: color .16s ease, padding .16s ease;
}

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

.page-about .team-fold summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--mute);
}

.page-about .team-fold[open] summary::after {
  content: "–";
  color: var(--ink);
}

.page-about .team-fold summary:hover,
.page-about .team-fold summary:focus-visible {
  padding-left: 8px;
  color: var(--ink);
  box-shadow: inset 3px 0 0 var(--lime);
}

.page-about .team-fold__body {
  padding: 0 0 16px 12px;
  border-left: 2px solid var(--lime);
  margin-bottom: 4px;
}

.page-about .team-fold__body p {
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ab-ink-soft);
  max-width: 34em;
}

/* ---------- 栏目地图 ---------- */
.page-about .map {
  margin-top: 16px;
  border-top: 1px solid var(--ab-line);
}

.page-about .maprow {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 15px 6px;
  border-bottom: 1px solid var(--ab-line);
  text-decoration: none;
  color: var(--ink);
  transition: background .16s ease, padding-left .16s ease;
}

.page-about .maprow:hover,
.page-about .maprow:focus-visible {
  background: rgba(200, 255, 61, .2);
  padding-left: 14px;
}

.page-about .maprow__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--mute);
}

.page-about .maprow__body {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.page-about .maprow__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
}

.page-about .maprow__desc {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ab-ink-soft);
}

.page-about .maprow__arrow {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--mute);
  transition: transform .16s ease, color .16s ease;
}

.page-about .maprow:hover .maprow__arrow,
.page-about .maprow:focus-visible .maprow__arrow {
  transform: translateX(4px);
  color: var(--ink);
}

.page-about .maprow--current {
  background: rgba(200, 255, 61, .12);
}

.page-about .maprow__arrow--mark {
  font-size: 11px;
  letter-spacing: .1em;
  padding: 2px 8px;
  background: var(--lime-ink);
  color: var(--lime);
}

/* ---------- 节奏与联系 ---------- */
.page-about .rhythm {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
  margin-top: 20px;
}

.page-about .rhythm__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--ab-line-light);
}

.page-about .rhythm__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--ab-line-light);
}

.page-about .rhythm__time {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--lime);
}

.page-about .rhythm__what {
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ab-paper-soft);
}

.page-about .contact-plate {
  background: var(--panel-lift);
  padding: 18px 16px 20px;
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
}

.page-about .contact-plate__cap {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .contact-plate__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
  padding: 9px 0;
  border-top: 1px solid var(--ab-line-light);
}

.page-about .contact-plate__label {
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--mute);
  min-width: 32px;
}

.page-about .contact-plate__value {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .03em;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.page-about .contact-plate .copy-btn {
  margin-left: auto;
  background: transparent;
  border: 1px solid var(--ab-line-light);
  color: var(--paper);
  font-size: 12px;
  padding: 3px 10px;
  cursor: pointer;
  transition: background .16s ease, color .16s ease, border-color .16s ease;
}

.page-about .contact-plate .copy-btn:hover,
.page-about .contact-plate .copy-btn:focus-visible {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--lime-ink);
}

.page-about .contact-plate__note {
  margin: 12px 0 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ab-paper-soft);
}

.page-about .contact-plate .btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.page-about .contact-plate .btn:hover .btn__arrow {
  transform: translateX(3px);
}

.page-about .contact-plate .btn__arrow {
  transition: transform .16s ease;
}

.page-about :where(a, button, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

.page-about .about-deck :where(a, button, summary, [tabindex]):focus-visible {
  outline-color: var(--ink);
}

.page-about .achapter--dark :where(a, button, summary, [tabindex]):focus-visible {
  outline-color: var(--lime);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .rhythm__item {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }
}

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

  .page-about .about-hero .title-xl {
    font-size: clamp(2.4rem, 4.4vw, 3.7rem);
  }

  .page-about .rhythm {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-deck__grid {
    grid-template-columns: 168px minmax(0, 1fr);
    column-gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--bar-h) + 24px);
    align-self: start;
    border-bottom: 0;
    border-right: 1px solid var(--ab-line);
    padding: 4px 18px 4px 0;
    margin-bottom: 0;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 4px;
  }

  .page-about .about-index__link {
    width: 100%;
    border-color: transparent;
    border-left: 2px solid transparent;
    padding: 6px 8px;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    border-left-color: var(--lime-ink);
  }

  .page-about .about-index__foot {
    flex-direction: column;
    gap: 2px;
    border-top: 1px solid var(--ab-line);
    padding-top: 10px;
  }

  .page-about .about-chapters > .achapter:first-child {
    padding-top: 4px;
  }

  .page-about .achapter--dark {
    padding: clamp(30px, 4vw, 44px) clamp(24px, 3vw, 40px);
  }

  .page-about .vnode__title {
    font-size: 18px;
  }

  .page-about .maprow {
    padding: 17px 10px;
  }
}

@media (hover: none) {
  .page-about .vnode__extra {
    max-height: 200px;
    opacity: 1;
    margin-top: 8px;
    padding-left: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }

  .page-about .flow__step:hover {
    transform: none;
  }
}
<<<END>>>