.page-about {
  --about-index-w: 208px;
  --about-head-w: 224px;
  --ink-line: rgba(217, 207, 188, 0.22);
  --ink-text: rgba(246, 241, 231, 0.82);
  --ink-text-dim: rgba(246, 241, 231, 0.6);
  color: var(--text);
}

/* ---------- 封面 ---------- */

.page-about .about-cover {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: calc(var(--header-h) + clamp(28px, 6vw, 64px)) 0 clamp(52px, 8vw, 104px);
}

.page-about .about-cover::before {
  content: "";
  position: absolute;
  z-index: 0;
  top: -160px;
  right: -130px;
  width: min(560px, 82vw);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(circle at 38% 38%, rgba(23, 162, 214, 0.34), rgba(23, 162, 214, 0) 68%);
  pointer-events: none;
}

.page-about .about-cover::after {
  content: "";
  position: absolute;
  z-index: 1;
  left: -6%;
  bottom: 34px;
  width: min(620px, 68%);
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--brand) 52%, var(--pulse));
  transform: skewX(-26deg);
  opacity: 0.9;
  pointer-events: none;
}

.page-about .about-cover__inner {
  position: relative;
  z-index: 2;
}

.page-about .about-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5em;
  align-items: baseline;
  font-size: 13px;
  color: var(--brand-soft);
}

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

.page-about .about-breadcrumb a:hover,
.page-about .about-breadcrumb a:focus-visible {
  text-decoration: underline;
}

.page-about .about-cover__eyebrow {
  margin: clamp(18px, 3.4vw, 30px) 0 0;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--brand-soft);
}

.page-about .about-cover__title {
  margin: clamp(14px, 2.6vw, 24px) 0 0;
  font-size: clamp(40px, 11.4vw, 100px);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-cover__shift {
  display: inline-block;
  padding-left: clamp(0px, 9vw, 104px);
}

.page-about .about-cover__lede {
  margin: clamp(20px, 3.6vw, 34px) 0 0;
  max-width: 44ch;
  font-size: clamp(16px, 2.3vw, 18px);
  line-height: 1.8;
  color: var(--ink-text);
}

.page-about .about-cover__stats {
  list-style: none;
  margin: clamp(32px, 5.5vw, 58px) 0 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .about-cover__stats .about-stat > p {
  margin: 0;
}

.page-about .about-stat__num {
  font-size: clamp(36px, 8vw, 56px);
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
}

.page-about .about-stat__unit {
  margin-left: 0.32em;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--brand-soft);
}

.page-about .about-stat__label {
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-text-dim);
}

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

@media (min-width: 720px) {
  .page-about .about-cover__stats {
    grid-template-columns: 0.85fr 1fr 1.2fr;
    gap: 0;
  }

  .page-about .about-stat {
    padding: 0 clamp(16px, 2.4vw, 30px);
    border-left: 1px solid var(--ink-line);
  }

  .page-about .about-stat:first-child {
    padding-left: 0;
    border-left: 0;
  }
}

@media (min-width: 1080px) {
  .page-about .about-cover__vnote {
    display: block;
    position: absolute;
    z-index: 3;
    top: calc(var(--header-h) + 96px);
    right: var(--gutter);
    writing-mode: vertical-rl;
    font-size: 12px;
    letter-spacing: 0.24em;
    color: var(--ink-text-dim);
    transform: rotate(4deg);
    animation: about-note-settle 320ms var(--ease-out) both;
  }
}

@keyframes about-note-settle {
  from { transform: rotate(12deg); opacity: 0; }
  to { transform: rotate(4deg); opacity: 1; }
}

/* ---------- 正文骨架与目录 ---------- */

.page-about .about-body {
  padding: clamp(32px, 6vw, 88px) 0 clamp(56px, 8vw, 116px);
}

.page-about .about-layout {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-index {
  position: sticky;
  top: var(--header-h);
  z-index: 4;
  margin-inline: calc(var(--gutter) * -1);
  padding: 10px var(--gutter) 12px;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
}

.page-about .about-index__label {
  display: none;
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--muted);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 2px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 9px 15px;
  border: 1px solid var(--rule);
  border-radius: var(--pill);
  font-size: 14px;
  line-height: 1.2;
  white-space: nowrap;
  color: var(--text);
  text-decoration: none;
  transition: border-color 160ms var(--ease-out), color 160ms var(--ease-out), background-color 160ms var(--ease-out);
}

.page-about .about-index__list a:hover {
  border-color: var(--brand);
  color: var(--brand);
}

.page-about .about-index__list a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.page-about .about-index__list a[aria-current="true"] {
  border-color: var(--brand);
  background: rgba(23, 162, 214, 0.08);
  color: var(--brand);
  font-weight: 700;
}

.page-about .about-index__list a[aria-current="true"]::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--pulse);
  box-shadow: 0 0 0 0 rgba(180, 255, 87, 0.85);
  animation: about-pulse 2.2s var(--ease-out) infinite;
}

@keyframes about-pulse {
  0% { box-shadow: 0 0 0 0 rgba(180, 255, 87, 0.85); }
  70% { box-shadow: 0 0 0 8px rgba(180, 255, 87, 0); }
  100% { box-shadow: 0 0 0 0 rgba(180, 255, 87, 0); }
}

.page-about .about-index__num {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-index__list a[aria-current="true"] .about-index__num {
  color: var(--brand);
}

@media (min-width: 1080px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    gap: clamp(44px, 5vw, 76px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 40px);
    margin-inline: 0;
    padding: 0 0 0 18px;
    background: none;
    border-bottom: 0;
    border-left: 1px solid var(--rule);
  }

  .page-about .about-index__label {
    display: block;
  }

  .page-about .about-index__list {
    display: block;
    overflow: visible;
  }

  .page-about .about-index__list li + li {
    margin-top: 4px;
  }

  .page-about .about-index__list a {
    display: flex;
    min-height: 0;
    padding: 7px 0;
    border: 0;
    border-radius: 0;
    font-size: 14px;
    color: var(--muted);
    white-space: normal;
  }

  .page-about .about-index__list a[aria-current="true"] {
    background: none;
    color: var(--brand);
  }
}

/* ---------- 章节 ---------- */

.page-about .chapter {
  display: grid;
  gap: clamp(14px, 3vw, 26px);
  padding: clamp(36px, 6.5vw, 72px) 0;
  border-top: 1px solid var(--rule);
  scroll-margin-top: calc(var(--header-h) + 78px);
}

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

.page-about .chapter__idx {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--muted);
}

.page-about .chapter__title {
  margin: 10px 0 0;
  font-size: clamp(26px, 5vw, 38px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .chapter__body > * + * {
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .chapter__body .prose p {
  margin: 0;
}

.page-about .chapter__body .prose p + p {
  margin-top: 1.1em;
}

.page-about .chapter__lead {
  margin: 0;
  font-size: 17px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .chapter__foot {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .chapter__foot a {
  color: var(--brand);
}

.page-about .chapter--ink {
  border-top: 0;
  border-radius: var(--r-lg);
  background: var(--ink);
  padding: clamp(28px, 5vw, 52px) clamp(20px, 4vw, 46px);
  margin: clamp(6px, 2vw, 18px) 0;
  color: var(--paper);
}

.page-about .chapter--ink .chapter__idx {
  color: var(--pulse);
}

.page-about .chapter--ink .chapter__title {
  color: var(--paper);
}

.page-about .chapter--ink .chapter__lead,
.page-about .chapter--ink .chapter__foot {
  color: var(--ink-text-dim);
}

.page-about .chapter--ink .prose,
.page-about .chapter--ink .prose p {
  color: var(--ink-text);
}

@media (min-width: 900px) {
  .page-about .chapter {
    grid-template-columns: var(--about-head-w) minmax(0, 1fr);
    gap: clamp(28px, 3.6vw, 52px);
    align-items: start;
  }

  .page-about .chapter__head {
    position: sticky;
    top: calc(var(--header-h) + 120px);
  }
}

/* ---------- 登记范围 ---------- */

.page-about .scope-list {
  margin: clamp(24px, 3.4vw, 34px) 0 0;
}

.page-about .scope-row {
  display: grid;
  gap: 8px;
  padding: 20px 0;
  border-top: 1px solid var(--rule);
}

.page-about .scope-row:last-child {
  border-bottom: 1px solid var(--rule);
}

.page-about .scope-row dt {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 800;
  color: var(--text);
}

.page-about .scope-row__tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: var(--pill);
  background: var(--brand);
  color: var(--paper);
  font-size: 12px;
}

.page-about .scope-row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

@media (min-width: 720px) {
  .page-about .scope-row {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 24px;
  }
}

/* ---------- 三道校验 ---------- */

.page-about .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .steps__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  padding: 18px 18px 18px 16px;
  border: 1px solid var(--ink-line);
  border-left: 3px solid var(--brand);
  border-radius: var(--r-md);
  background: rgba(246, 241, 231, 0.03);
  transition: transform 160ms var(--ease-out), border-color 160ms var(--ease-out);
}

.page-about .steps__item:hover {
  transform: translateX(4px);
  border-left-color: var(--accent);
}

.page-about .steps__num {
  font-size: 15px;
  font-weight: 700;
  color: var(--pulse);
}

.page-about .steps__text h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .steps__text p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-text);
}

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

.page-about .about-fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--r-md);
  object-fit: cover;
}

.page-about .about-fig .figure__cap {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .chapter--ink .about-fig .figure__cap {
  color: var(--ink-text-dim);
}

.page-about .about-fig--check {
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--ink-line);
  padding: 10px;
}

.page-about .about-fig--check img {
  aspect-ratio: 3 / 2;
}

/* ---------- 团队分工 ---------- */

.page-about .roles {
  list-style: none;
  margin: clamp(24px, 3.4vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .role {
  padding: 18px 18px 20px;
  border: 1px solid var(--rule);
  border-radius: var(--r-md);
}

.page-about .role__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 8px;
}

.page-about .role__num {
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
}

.page-about .role__name {
  font-size: 17px;
  font-weight: 800;
  color: var(--text);
}

.page-about .role__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--muted);
}

@media (min-width: 720px) {
  .page-about .roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 20px;
  }

  .page-about .role:nth-child(2n) {
    border-color: rgba(23, 162, 214, 0.5);
  }
}

/* ---------- 时间轴 ---------- */

.page-about .about-fig--night {
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-fig--night img {
  aspect-ratio: 2 / 1;
}

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

.page-about .timeline__item {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 14px;
  padding: 22px 0;
  border-top: 1px solid var(--ink-line);
  transition: border-color 160ms var(--ease-out);
}

.page-about .timeline__item:last-child {
  border-bottom: 1px solid var(--ink-line);
}

.page-about .timeline__item:hover {
  border-top-color: var(--brand);
}

.page-about .timeline__year {
  margin: 0;
  font-size: clamp(22px, 4vw, 28px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--brand-soft);
  transition: color 160ms var(--ease-out);
}

.page-about .timeline__item:hover .timeline__year {
  color: var(--pulse);
}

.page-about .timeline__text h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .timeline__text p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--ink-text);
}

@media (min-width: 720px) {
  .page-about .timeline__item {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 28px;
  }
}

/* ---------- 本地服务 ---------- */

.page-about .about-fig--local {
  border-radius: var(--r-md);
  overflow: hidden;
  padding: 8px;
  border: 1px solid var(--rule);
  background: var(--paper-raise);
}

.page-about .about-fig--local img {
  aspect-ratio: 14 / 9;
}

/* ---------- 口径与边界 ---------- */

.page-about .bounds-list {
  margin: 0;
}

.page-about .bounds-row {
  padding: 20px 0;
  border-top: 1px solid var(--rule);
}

.page-about .bounds-row:last-child {
  border-bottom: 1px solid var(--rule);
}

.page-about .bounds-row dt {
  font-size: 16px;
  font-weight: 800;
  color: var(--text);
}

.page-about .bounds-row dd {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

@media (min-width: 720px) {
  .page-about .bounds-row {
    display: grid;
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 24px;
  }

  .page-about .bounds-row dd {
    margin-top: 0;
  }
}

/* ---------- 收尾 ---------- */

.page-about .about-outro {
  position: relative;
  padding: clamp(48px, 8vw, 96px) 0 clamp(52px, 8vw, 92px);
}

.page-about .about-outro::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: min(420px, 62%);
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--brand-soft));
  transform: skewX(-26deg);
}

.page-about .about-outro__quote {
  margin: 0;
  max-width: 22ch;
  font-size: clamp(26px, 5.4vw, 46px);
  font-weight: 900;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-outro__sub {
  margin: clamp(22px, 3.6vw, 34px) 0 0;
  font-size: 15px;
  color: var(--ink-text-dim);
}

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.page-about .about-links .btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__list a[aria-current="true"]::before,
  .page-about .about-cover__vnote {
    animation: none;
  }

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