.page-about {
  --about-measure: 64ch;
  color: var(--paper);
  background-color: var(--ink-900);
  background-image:
    linear-gradient(rgba(147, 167, 188, .055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(147, 167, 188, .055) 1px, transparent 1px);
  background-size: 48px 48px, 48px 48px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 112px 0 44px;
  border-bottom: 1px solid var(--ink-700);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(55, 230, 178, .12), transparent 62%),
    radial-gradient(90% 80% at 0% 100%, rgba(124, 92, 255, .10), transparent 60%);
}

.page-about .about-hero .db-crumbs {
  margin-bottom: 28px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-hero__kicker {
  color: var(--mint);
  margin: 0 0 14px;
}

.page-about .about-hero__title {
  font-size: clamp(34px, 6.4vw, 66px);
  line-height: 1.08;
  letter-spacing: -.02em;
  font-weight: 900;
  margin: 0 0 20px;
  max-width: 16ch;
}

.page-about .about-hero__lead {
  max-width: 52ch;
  color: var(--paper);
  font-size: 16px;
  line-height: 1.85;
  margin: 0 0 22px;
}

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

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

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  clip-path: polygon(0 5%, 100% 0, 100% 95%, 0 100%);
  border-radius: var(--radius);
}

.page-about .about-hero__note {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--stone);
}

/* ---------- 主体布局 ---------- */
.page-about .about-body {
  display: grid;
  gap: 36px;
  padding: 40px 0 72px;
}

.page-about .about-toc {
  border: 1px solid var(--ink-700);
  background: var(--ink-800);
  border-radius: var(--radius);
  padding: 16px 18px;
}

.page-about .about-toc .db-label {
  color: var(--stone);
  margin: 0;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-toc__link {
  display: inline-block;
  padding: 5px 10px;
  font-size: 13px;
  color: var(--stone);
  text-decoration: none;
  border: 1px solid var(--ink-700);
  border-radius: 999px;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--ink-900);
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .about-main {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding-top: 6px;
  margin-bottom: 64px;
}

.page-about .about-section__num {
  display: block;
  color: var(--mint);
  margin: 0 0 10px;
}

.page-about .about-section__title {
  font-size: clamp(25px, 3.6vw, 36px);
  line-height: 1.22;
  letter-spacing: -.01em;
  margin: 0 0 22px;
  max-width: 20ch;
}

.page-about .about-intro {
  max-width: var(--about-measure);
  color: var(--stone);
  font-size: 15px;
  line-height: 1.8;
  margin: 0 0 22px;
}

.page-about .about-prose p {
  max-width: var(--about-measure);
  font-size: 16px;
  line-height: 1.88;
  margin: 0 0 18px;
  color: var(--paper);
}

.page-about .about-prose--lede p:first-of-type::first-letter {
  float: left;
  font-size: 3.5em;
  line-height: .84;
  padding: .06em .1em 0 0;
  font-weight: 900;
  color: var(--lime);
}

.page-about .about-prose--after {
  margin: 26px 0 0;
  max-width: var(--about-measure);
  font-size: 15px;
  line-height: 1.85;
  color: var(--stone);
  border-left: 3px solid var(--ink-600);
  padding-left: 16px;
}

/* ---------- 内容线 Bento ---------- */
.page-about .about-lines {
  display: grid;
  gap: 14px;
}

.page-about .about-line {
  background: var(--ink-700);
  border: 1px solid var(--ink-800);
  border-left: 4px solid var(--mint);
  border-radius: var(--radius);
  padding: 20px 20px 18px;
}

.page-about .about-line--d {
  border-left-color: var(--lime);
  background: linear-gradient(155deg, var(--ink-600), var(--ink-700) 75%);
}

.page-about .about-line .db-h3 {
  font-size: 19px;
  margin: 0 0 10px;
  color: var(--paper);
}

.page-about .about-line p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.8;
  color: #D6E2ED;
}

.page-about .about-line__link {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 255, 61, .45);
  padding-bottom: 2px;
}

.page-about .about-line__link:hover,
.page-about .about-line__link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 24px;
}

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

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--ink-700);
}

.page-about .about-roles {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: flex-start;
}

.page-about .about-role {
  flex: 1 1 100%;
  background: var(--ink-800);
  border: 1px solid var(--ink-700);
  border-radius: var(--radius);
  padding: 16px 18px 18px;
  transition: transform .22s var(--ease), border-color .22s var(--ease);
}

.page-about .about-role--1 { border-color: rgba(200, 255, 61, .45); transform: rotate(-.7deg); }
.page-about .about-role--2 { border-color: rgba(55, 230, 178, .40); transform: rotate(.5deg); }
.page-about .about-role--3 { border-color: rgba(124, 92, 255, .45); transform: rotate(-.4deg); }
.page-about .about-role--4 { border-color: rgba(255, 138, 61, .45); transform: rotate(.8deg); }

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  transform: rotate(0deg) translateY(-4px);
  border-color: var(--lime);
}

.page-about .about-role__num {
  font-size: 30px;
  line-height: 1;
  margin: 0 0 8px;
  color: var(--lime);
  font-weight: 700;
}

.page-about .about-role .db-h3 {
  font-size: 16px;
  margin: 0 0 8px;
}

.page-about .about-role__daily {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--stone);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-versionart {
  margin: 0 0 22px;
}

.page-about .about-versionart img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--ink-700);
  clip-path: polygon(0 0, 100% 0, 100% 92%, 0 100%);
}

.page-about .about-track {
  list-style: none;
  margin: 0;
  padding: 0 0 16px;
  display: flex;
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  border-bottom: 1px solid var(--ink-700);
}

.page-about .about-vcard {
  flex: 0 0 78%;
  scroll-snap-align: start;
  background: var(--ink-800);
  border: 1px solid var(--ink-700);
  border-top: 3px solid var(--ink-600);
  border-radius: var(--radius);
  padding: 14px 16px 16px;
}

.page-about .about-vcard.is-current {
  border-top-color: var(--lime);
  background: linear-gradient(170deg, var(--ink-600), var(--ink-800) 80%);
}

.page-about .about-vcard summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "node num"
    "node stage"
    "node name";
  gap: 2px 10px;
  align-items: start;
}

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

.page-about .about-vcard summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

.page-about .about-vnode {
  grid-area: node;
  width: 12px;
  height: 12px;
  margin-top: 6px;
  border-radius: 50%;
  border: 2px solid var(--mint);
  background: transparent;
}

.page-about .is-current .about-vnode {
  background: var(--lime);
  border-color: var(--lime);
  box-shadow: 0 0 0 4px rgba(200, 255, 61, .18);
}

.page-about .about-vnum {
  grid-area: num;
  font-size: 20px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-vstage {
  grid-area: stage;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--stone);
}

.page-about .about-vname {
  grid-area: name;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--mint);
  line-height: 1.5;
}

.page-about .about-vcard p {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: #C7D5E2;
}

.page-about .about-note {
  margin: 12px 0 0;
  font-size: 12.5px;
  color: var(--stone);
}

/* ---------- 三线加权 ---------- */
.page-about .about-weight {
  display: grid;
  gap: 24px;
  align-items: center;
}

.page-about .about-weight__art {
  border: 1px solid var(--ink-700);
  background: var(--ink-800);
  border-radius: var(--radius);
  padding: 14px;
}

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

.page-about .about-weight__grid line {
  stroke: var(--ink-700);
  stroke-width: 1;
}

.page-about .about-weight__path {
  fill: none;
  stroke-width: 3;
  stroke-linecap: round;
  stroke-dasharray: 1200;
}

.page-about .about-weight__l1 { stroke: var(--lime); }
.page-about .about-weight__l2 { stroke: var(--mint); }
.page-about .about-weight__l3 { stroke: var(--orange); }

.page-about .about-weight__dot {
  fill: var(--lime);
}

.page-about .about-weight__stem {
  stroke: var(--lime);
  stroke-width: 3;
  stroke-linecap: round;
}

.page-about .about-weight__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-weight__item {
  border-left: 3px solid var(--ink-600);
  padding-left: 14px;
}

.page-about .about-weight__item--l1 { border-left-color: var(--lime); }
.page-about .about-weight__item--l2 { border-left-color: var(--mint); }
.page-about .about-weight__item--l3 { border-left-color: var(--orange); }

.page-about .about-weight__item .db-h3 {
  font-size: 16px;
  margin: 0 0 6px;
}

.page-about .about-weight__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--stone);
}

/* ---------- 协作生态 ---------- */
.page-about .about-eco {
  display: grid;
  gap: 24px;
}

.page-about .about-eco__copy p {
  max-width: var(--about-measure);
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--paper);
}

.page-about .about-eco__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 14px;
}

.page-about .about-eco__stat {
  background: var(--ink-800);
  border: 1px solid var(--ink-700);
  border-radius: var(--radius);
  padding: 16px 14px;
}

.page-about .about-eco__statnum {
  margin: 0 0 6px;
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  color: var(--mint);
}

.page-about .about-eco__statlabel {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--stone);
}

/* ---------- 收束 ---------- */
.page-about .about-talk {
  background: var(--lime);
  color: var(--ink-900);
  border-radius: var(--radius);
  padding: 28px 22px;
}

.page-about .about-talk .db-label {
  color: var(--ink-800);
  margin: 0 0 10px;
}

.page-about .about-talk__title {
  font-size: clamp(23px, 3.4vw, 32px);
  line-height: 1.2;
  margin: 0 0 12px;
  color: var(--ink-900);
}

.page-about .about-talk__text {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-800);
}

.page-about .about-talk__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-talk__btn {
  display: inline-flex;
  align-items: center;
  padding: 12px 24px;
  border-radius: var(--radius);
  background: var(--ink-900);
  color: var(--paper);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  border: 1px solid var(--ink-900);
  transition: background-color .2s var(--ease), color .2s var(--ease);
}

.page-about .about-talk__btn:hover,
.page-about .about-talk__btn:focus-visible {
  background: var(--ink-700);
}

.page-about .about-talk__btn--ghost {
  background: transparent;
  color: var(--ink-900);
}

.page-about .about-talk__btn--ghost:hover,
.page-about .about-talk__btn--ghost:focus-visible {
  background: rgba(8, 24, 43, .12);
  color: var(--ink-900);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding-top: 124px;
  }

  .page-about .about-role {
    flex: 1 1 calc(50% - 14px);
  }

  .page-about .about-role--1 { flex-basis: 58%; }
  .page-about .about-role--2 { flex-basis: 38%; }
  .page-about .about-role--3 { flex-basis: 38%; }
  .page-about .about-role--4 { flex-basis: 58%; }

  .page-about .about-vcard {
    flex: 0 0 300px;
  }

  .page-about .about-talk {
    padding: 36px 32px;
  }
}

@media (min-width: 820px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.12fr .88fr;
    align-items: end;
    gap: 48px;
  }

  .page-about .about-lines {
    grid-template-columns: repeat(12, 1fr);
    gap: 16px;
  }

  .page-about .about-line--a { grid-column: span 7; }
  .page-about .about-line--b { grid-column: span 5; }
  .page-about .about-line--c { grid-column: span 5; }
  .page-about .about-line--d { grid-column: span 7; }

  .page-about .about-team {
    grid-template-columns: .85fr 1.15fr;
    align-items: start;
    gap: 28px;
  }

  .page-about .about-weight {
    grid-template-columns: 1.05fr .95fr;
    gap: 32px;
  }

  .page-about .about-eco {
    grid-template-columns: 1.15fr .85fr;
    gap: 32px;
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 1fr) 216px;
    gap: 56px;
    padding-top: 48px;
  }

  .page-about .about-toc {
    order: 2;
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-main {
    order: 1;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 2px;
  }

  .page-about .about-toc__link {
    display: block;
    border: 0;
    border-left: 2px solid var(--ink-700);
    border-radius: 0;
    padding: 7px 0 7px 12px;
    background: transparent;
  }

  .page-about .about-toc__link:hover,
  .page-about .about-toc__link:focus-visible {
    background: transparent;
    color: var(--lime);
    border-left-color: var(--lime);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-talk__btn,
  .page-about .about-toc__link {
    transition: none;
  }

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