.page-about {
  --pa-panel-line: rgba(127, 211, 247, .16);
  --pa-panel-num: rgba(127, 211, 247, .34);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
}

/* ---------- 页首：协议声明 ---------- */
.page-about .pa-masthead {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(120% 90% at 80% 6%, rgba(53, 214, 164, .11), transparent 58%),
    radial-gradient(90% 70% at 8% 0%, rgba(127, 211, 247, .13), transparent 62%),
    var(--night);
  color: var(--night-text);
  padding: calc(var(--header-h) + 3.25rem) 0 clamp(2.25rem, 6vw, 3.5rem);
}

.page-about .pa-masthead::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(to right, rgba(127, 211, 247, .06) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(to bottom, rgba(127, 211, 247, .05) 0 1px, transparent 1px 64px);
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .9), transparent 88%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .9), transparent 88%);
}

.page-about .pa-mast-inner {
  position: relative;
  z-index: 1;
}

.page-about .pa-crumbs {
  margin-bottom: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .pa-masthead .crumb {
  color: var(--night-muted);
}

.page-about .pa-masthead .crumb[aria-current="page"] {
  color: var(--ice);
}

.page-about .pa-masthead a.crumb:hover {
  color: var(--ice);
}

.page-about .pa-mast-grid {
  display: grid;
  gap: 2.25rem;
  align-items: center;
}

.page-about .pa-masthead .eyebrow {
  color: var(--ice);
}

.page-about .pa-masthead .h-display {
  color: var(--paper);
  margin: .6rem 0 1rem;
}

.page-about .pa-masthead .lede {
  color: var(--night-text);
  max-width: 54ch;
  margin: 0;
}

.page-about .pa-facts {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .6rem 1rem;
  margin: 1.6rem 0 0;
  font-size: .76rem;
  letter-spacing: .06em;
  color: var(--ice);
}

.page-about .pa-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--pulse);
  display: inline-block;
}

.page-about .pa-mast-visual {
  display: none;
}

.page-about .pa-mast-visual svg {
  display: block;
  width: 100%;
  height: auto;
}

@keyframes pa-pulse {
  0%, 100% { opacity: .38; transform: scale(.88); }
  50% { opacity: 1; transform: scale(1.16); }
}

.page-about .pa-ring-dot {
  transform-box: fill-box;
  transform-origin: center;
  animation: pa-pulse 2.6s ease-in-out infinite;
}

.page-about .pa-ring-dot--ice { animation-delay: .8s; }
.page-about .pa-ring-dot--gold { animation-delay: 1.6s; }

/* ---------- 主体布局 ---------- */
.page-about .pa-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2.5rem;
  padding-top: clamp(2.25rem, 6vw, 4rem);
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

.page-about .pa-body {
  min-width: 0;
}

/* ---------- 章节索引 ---------- */
.page-about .pa-index {
  border-top: 1px solid var(--hair);
  padding-top: 1rem;
}

.page-about .chapter-index-title {
  margin: 0 0 .7rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.page-about .pa-index-list {
  list-style: none;
  margin: 0;
  padding: 0 0 .35rem;
  display: flex;
  gap: .5rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .chapter-link {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  white-space: nowrap;
  padding: .4rem .85rem;
  border: 1px solid var(--hair);
  border-radius: var(--radius-pill);
  font-size: .85rem;
  color: var(--ink-muted);
  text-decoration: none;
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}

.page-about .chapter-link:hover {
  color: var(--ink);
}

.page-about .chapter-link[aria-current="true"] {
  color: var(--pulse-ink);
  border-color: var(--pulse);
  background: rgba(53, 214, 164, .1);
}

.page-about .chapter-idx {
  font-family: var(--font-mono);
  font-size: .7rem;
  opacity: .8;
}

/* ---------- 章节通用 ---------- */
.page-about .pa-chapter {
  padding-block: clamp(1.75rem, 4vw, 2.9rem);
  border-top: 1px solid var(--hair);
}

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

.page-about .pa-chapter-head {
  display: flex;
  align-items: baseline;
  gap: 1rem 1.25rem;
  margin-bottom: 1.25rem;
}

.page-about .pa-chapter .chapter-num {
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 6vw, 3.4rem);
  font-weight: 700;
  line-height: .85;
  letter-spacing: -.03em;
  color: var(--hair);
}

.page-about .pa-chapter .h-section {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 3.4vw, 2.1rem);
  line-height: 1.16;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .pa-chapter .eyebrow {
  margin: 0 0 .3rem;
  color: var(--ice-ink);
}

.page-about .pa-chapter p {
  max-width: 68ch;
  margin: 0 0 1.15em;
}

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

.page-about .pa-chapter a {
  color: var(--ice-ink);
  text-underline-offset: 3px;
}

.page-about .pa-chapter a:hover {
  color: var(--pulse-ink);
}

.page-about .pa-sub {
  margin: 1.9rem 0 .7rem;
  font-family: var(--font-display);
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .muted {
  font-size: .9rem;
  color: var(--ink-muted);
}

/* ---------- 图片框架 ---------- */
.page-about .pa-figure {
  margin: 0 0 clamp(1.25rem, 3vw, 2rem);
}

.page-about .pa-frame {
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--black);
}

.page-about .pa-frame--32 {
  aspect-ratio: 3 / 2;
}

.page-about .pa-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 职责范围两组清单 ---------- */
.page-about .pa-scope {
  display: grid;
  gap: 1.75rem;
  margin: 1.75rem 0 1.5rem;
}

.page-about .pa-scope-col .h-sub {
  margin: 0 0 .25rem;
  font-family: var(--font-display);
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .pa-list {
  list-style: none;
  margin: .6rem 0 0;
  padding: 0;
}

.page-about .pa-list li {
  position: relative;
  padding: .68rem 0 .68rem 1.5rem;
  border-bottom: 1px solid var(--hair);
  font-size: .94rem;
  line-height: 1.65;
}

.page-about .pa-list li:last-child {
  border-bottom: 0;
}

.page-about .pa-list li::before {
  content: "";
  position: absolute;
  left: .15rem;
  top: 1.2rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
}

.page-about .pa-list--keep li::before {
  background: var(--pulse-ink);
  box-shadow: 0 0 0 4px rgba(15, 122, 95, .12);
}

.page-about .pa-list--drop li::before {
  background: transparent;
  border: 1.5px solid var(--ridge);
}

/* ---------- 参数条 ---------- */
.page-about .pa-param {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .4rem 1.35rem;
  margin: 1.6rem 0 0;
  padding: .85rem 1.15rem;
  border-radius: var(--radius-md);
  border-left: 3px solid var(--gold-ink);
  background: var(--paper-2);
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .03em;
  color: var(--ink-muted);
  max-width: none;
}

.page-about .pa-param > span {
  display: inline-block;
}

.page-about .pa-param-num {
  color: var(--gold-ink);
  font-weight: 600;
}

/* ---------- 深色终端面板 ---------- */
.page-about .pa-panel {
  position: relative;
  overflow: hidden;
  margin-block: clamp(1.5rem, 3.5vw, 2.25rem);
  padding: clamp(1.5rem, 4vw, 3rem);
  border-top: 0;
  border-radius: var(--radius-lg);
  background: var(--night);
  color: var(--night-text);
  box-shadow: var(--shadow-night);
}

.page-about .pa-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(80% 60% at 88% 0%, rgba(53, 214, 164, .1), transparent 62%);
}

.page-about .pa-panel > * {
  position: relative;
}

.page-about .pa-panel .h-section,
.page-about .pa-panel .pa-sub {
  color: var(--paper);
}

.page-about .pa-panel p {
  color: var(--night-text);
}

.page-about .pa-panel .chapter-num {
  color: var(--pa-panel-num);
}

.page-about .pa-panel .eyebrow {
  color: var(--ice);
}

.page-about .pa-panel .muted {
  color: var(--night-muted);
}

.page-about .pa-panel a {
  color: var(--ice);
}

.page-about .pa-panel a:hover {
  color: var(--pulse);
}

.page-about .pa-param--night {
  background: rgba(4, 7, 15, .72);
  border-left-color: var(--gold);
  color: var(--night-muted);
}

.page-about .pa-param--night .pa-param-num {
  color: var(--gold);
}

/* ---------- 四节点轨道 ---------- */
.page-about .pa-track {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .75rem;
  margin: 1.75rem 0 .5rem;
}

.page-about .pa-track .step {
  padding: 1rem 1.1rem;
  border: 1px solid var(--night-line);
  border-radius: var(--radius-md);
  background: rgba(4, 7, 15, .55);
}

.page-about .pa-track .step-num {
  display: block;
  margin-bottom: .35rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .12em;
  color: var(--pulse);
}

.page-about .pa-track .step-body {
  font-size: .9rem;
  line-height: 1.6;
  color: var(--night-text);
}

.page-about .pa-track .step-body strong {
  display: block;
  margin-bottom: .2rem;
  font-family: var(--font-display);
  font-size: .98rem;
  letter-spacing: 0;
  color: var(--paper);
}

/* ---------- 仓库与核对路径 ---------- */
.page-about .pa-repo-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
  margin: 1.5rem 0 0;
}

.page-about .pa-figure--side {
  margin: 0;
}

.page-about .pa-repo-layout .h-sub {
  margin: 0;
  font-family: var(--font-display);
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .pa-steps {
  list-style: none;
  counter-reset: pa-step;
  margin: .6rem 0 1.4rem;
  padding: 0;
}

.page-about .pa-steps li {
  position: relative;
  display: flex;
  gap: .9rem;
  align-items: flex-start;
  padding: .8rem 0;
  border-bottom: 1px solid var(--hair);
  font-size: .94rem;
}

.page-about .pa-steps li:last-child {
  border-bottom: 0;
}

.page-about .pa-step-n {
  flex: none;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1.5px solid var(--pulse-ink);
  color: var(--pulse-ink);
  font-family: var(--font-mono);
  font-size: .76rem;
  line-height: 24px;
  text-align: center;
  margin-top: .15rem;
}

/* ---------- 折叠参数表 ---------- */
.page-about .pa-folds {
  margin: 1.6rem 0 1.4rem;
}

.page-about .pa-folds details.collapse {
  border-top: 1px solid var(--night-line);
}

.page-about .pa-folds details.collapse:last-of-type {
  border-bottom: 1px solid var(--night-line);
}

.page-about .pa-folds summary {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: .95rem .1rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: .86rem;
  color: var(--ice);
}

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

.page-about .pa-folds summary::after {
  content: "展开";
  flex: none;
  font-size: .68rem;
  letter-spacing: .12em;
  color: var(--ridge);
}

.page-about .pa-folds details[open] summary::after {
  content: "收起";
}

.page-about .pa-fold-title {
  flex: 1 1 auto;
}

.page-about .pa-fold-val {
  flex: none;
  color: var(--gold);
  font-size: .8rem;
}

.page-about .pa-folds .collapse-body {
  padding: 0 .1rem 1.1rem;
  font-size: .9rem;
  color: var(--night-text);
}

.page-about .pa-folds .collapse-body p {
  margin: 0;
  max-width: 62ch;
}

/* ---------- 协作结构 ---------- */
.page-about .pa-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  margin: 1.6rem 0 1.6rem;
}

.page-about .pa-role {
  padding: 1.1rem 1.25rem 1.15rem;
  border-radius: var(--radius-md);
  background: var(--paper-2);
  border-top: 3px solid var(--ice-ink);
}

.page-about .pa-role p {
  margin: 0;
  font-size: .93rem;
}

.page-about .pa-role-name {
  margin: 0 0 .4rem;
  font-size: .74rem;
  letter-spacing: .12em;
  color: var(--ice-ink);
}

/* ---------- 里程碑时间线 ---------- */
.page-about .pa-milestones {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
}

.page-about .pa-milestones li {
  display: grid;
  grid-template-columns: clamp(56px, 14vw, 92px) minmax(0, 1fr);
  gap: 0 1.25rem;
  align-items: start;
  padding: 1.15rem 0;
  border-top: 1px solid var(--night-line);
}

.page-about .pa-milestones li:first-child {
  border-top: 0;
  padding-top: .3rem;
}

.page-about .pa-ms-tag {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 3.6vw, 1.9rem);
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1;
  color: var(--gold);
}

.page-about .pa-milestones h3 {
  margin: 0 0 .35rem;
  font-family: var(--font-display);
  font-size: 1.02rem;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .pa-milestones p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.65;
  color: var(--night-muted);
  max-width: 58ch;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .pa-scope {
    grid-template-columns: 1fr 1fr;
    gap: 1.75rem 2.5rem;
  }

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

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

  .page-about .pa-frame {
    aspect-ratio: 5 / 2;
  }

  .page-about .pa-frame--32 {
    aspect-ratio: 3 / 2;
  }
}

@media (min-width: 900px) {
  .page-about .pa-mast-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(2rem, 5vw, 4.5rem);
  }

  .page-about .pa-mast-visual {
    display: block;
    justify-self: end;
    width: min(320px, 100%);
  }

  .page-about .pa-repo-layout {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(1.5rem, 4vw, 3rem);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .pa-layout {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: clamp(2.5rem, 5vw, 5rem);
    align-items: start;
  }

  .page-about .pa-index {
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
    border-top: 0;
    padding-top: 0;
  }

  .page-about .pa-index-list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .pa-index-list li + li {
    margin-top: .1rem;
  }

  .page-about .chapter-link {
    display: flex;
    width: 100%;
    padding: .42rem .7rem;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0 10px 10px 0;
    font-size: .87rem;
  }

  .page-about .chapter-link[aria-current="true"] {
    border-left-color: var(--pulse);
    background: var(--paper-2);
    color: var(--pulse-ink);
  }

  .page-about .pa-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .pa-chapter-head {
    gap: 1.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .pa-ring-dot {
    animation: none;
    opacity: 1;
  }

  .page-about [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .page-about .chapter-link,
  .page-about .pa-panel,
  .page-about .pa-frame img {
    transition: none;
  }
}
<<<END>>>