.page-about {
  --about-text: rgba(244, 247, 242, .86);
  --about-rail: 220px;
  color: var(--mist-100);
  background:
    radial-gradient(1100px 520px at 84% -8%, rgba(200, 255, 61, .12), transparent 62%),
    radial-gradient(900px 460px at 4% 14%, rgba(31, 107, 79, .26), transparent 60%),
    var(--ink-900);
  padding-bottom: clamp(48px, 8vw, 96px);
  overflow-x: clip;
}

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

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 800;
}

.page-about p {
  margin: 0 0 1em;
  line-height: 1.78;
  color: var(--about-text);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(104px, 13vw, 158px);
  padding-bottom: clamp(28px, 4vw, 48px);
  position: relative;
}

.page-about .breadcrumbs {
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--sage-400);
}

.page-about .breadcrumbs a {
  color: var(--sage-400);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover {
  color: var(--lime-500);
}

.page-about .hero-frame {
  position: relative;
  margin-top: clamp(20px, 3vw, 36px);
  padding: clamp(26px, 4vw, 56px);
  border: 1px solid var(--line-700);
  border-radius: var(--radius-lg);
  background: linear-gradient(158deg, rgba(18, 63, 52, .78), rgba(7, 26, 43, .92));
  box-shadow: var(--shadow-island);
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .hero-frame::before {
  content: "";
  position: absolute;
  top: 12px;
  left: clamp(26px, 4vw, 56px);
  right: clamp(26px, 4vw, 56px);
  height: 10px;
  background-image: repeating-linear-gradient(90deg, var(--line-700) 0 1px, transparent 1px 22px);
  pointer-events: none;
}

.page-about h1 {
  margin: 12px 0 0;
  font-size: clamp(36px, 6.4vw, 82px);
  line-height: .96;
  letter-spacing: -.02em;
  max-width: 12em;
}

.page-about .lede {
  margin-top: clamp(16px, 2.4vw, 24px);
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.72;
  color: var(--about-text);
  max-width: 46em;
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: clamp(22px, 3vw, 32px) 0 0;
}

.page-about .hero-stats div {
  border-top: 1px solid var(--line-700);
  padding-top: 10px;
  min-width: 0;
}

.page-about .hero-stats dt {
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--sage-400);
}

.page-about .hero-stats dd {
  margin: 6px 0 0;
  font-size: clamp(17px, 2.2vw, 24px);
  color: var(--lime-500);
  letter-spacing: -.01em;
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .hero-figure {
  margin: 0;
  min-width: 0;
}

.page-about .media {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  border: 1px solid var(--line-700);
  background: var(--ink-800);
}

.page-about .media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .media-cap {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.65;
  color: var(--sage-400);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
  padding-top: clamp(30px, 5vw, 64px);
}

.page-about .chapter-rail {
  border-top: 1px solid var(--line-700);
  padding-top: 14px;
  min-width: 0;
}

.page-about .rail-title {
  margin: 0;
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--sage-400);
}

.page-about .rail-list {
  list-style: none;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  margin: 12px 0 0;
  padding: 0 0 6px;
  scrollbar-width: thin;
}

.page-about .chapter-link {
  display: block;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  padding: 8px 13px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  color: var(--sage-400);
  text-decoration: none;
  transition: color .18s var(--ease), background-color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .chapter-link:hover {
  color: var(--mist-100);
  border-color: var(--line-700);
}

.page-about .chapter-link[data-active="true"] {
  color: var(--ink-900);
  background: var(--lime-500);
  border-color: var(--lime-500);
  font-weight: 700;
}

.page-about .rail-note {
  display: none;
}

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

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding: clamp(30px, 5vw, 62px) 0;
  border-top: 1px solid var(--line-700);
  scroll-margin-top: clamp(92px, 12vh, 130px);
}

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

.page-about .sec-head {
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 2vw, 20px);
  flex-wrap: wrap;
}

.page-about .chapter-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(38px, 6.6vw, 72px);
  line-height: .82;
  letter-spacing: -.04em;
  color: rgba(31, 107, 79, .35);
  -webkit-text-stroke: 1px var(--pitch-500);
}

.page-about .about-section h2 {
  margin: 0;
  font-size: clamp(23px, 3.3vw, 38px);
  line-height: 1.18;
  letter-spacing: -.01em;
  color: var(--mist-100);
}

.page-about .sec-lede {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  font-size: clamp(15px, 1.7vw, 17px);
  max-width: 44em;
}

.page-about .sec-grid {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  margin-top: clamp(18px, 2.6vw, 30px);
  align-items: start;
}

.page-about .sec-grid .lede {
  margin: 0;
  font-size: clamp(16px, 1.9vw, 19px);
  line-height: 1.7;
  color: var(--mist-100);
}

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

/* ---------- 筛选条 ---------- */
.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: clamp(18px, 2.6vw, 28px);
}

.page-about .filter-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line-700);
  background: transparent;
  color: var(--sage-400);
  cursor: pointer;
  transition: background-color .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .filter-btn:hover {
  color: var(--mist-100);
  border-color: var(--pitch-500);
}

.page-about .filter-btn[aria-pressed="true"] {
  background: var(--lime-500);
  border-color: var(--lime-500);
  color: var(--ink-900);
  font-weight: 700;
}

.page-about .filter-note {
  margin: 0 0 0 auto;
  font-size: 12px;
  color: var(--sage-400);
}

.page-about .filter-note .mono {
  color: var(--lime-500);
  font-size: 14px;
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  position: relative;
  display: grid;
  gap: 14px;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding-left: 30px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--lime-500), var(--pitch-500) 52%, var(--line-700));
}

.page-about .tl-item {
  position: relative;
  border: 1px solid var(--line-700);
  border-radius: var(--radius-md);
  background: rgba(18, 63, 52, .5);
  transition: border-color .18s var(--ease);
}

.page-about .tl-item:hover {
  border-color: var(--pitch-500);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 22px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--pitch-500);
  transition: background-color .18s var(--ease), border-color .18s var(--ease), box-shadow .18s var(--ease);
}

.page-about .tl-item[open] {
  border-color: var(--lime-500);
  background: rgba(18, 63, 52, .8);
}

.page-about .tl-item[open]::before {
  background: var(--lime-500);
  border-color: var(--lime-500);
  box-shadow: 0 0 0 5px rgba(200, 255, 61, .14);
}

.page-about .tl-summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
  border-radius: var(--radius-md);
}

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

.page-about .tl-summary:focus-visible {
  outline: 2px solid var(--lime-500);
  outline-offset: 2px;
}

.page-about .tl-year {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--lime-500);
  white-space: nowrap;
}

.page-about .tl-title {
  font-weight: 700;
  font-size: clamp(15px, 1.9vw, 17px);
  color: var(--mist-100);
}

.page-about .tl-hint {
  flex: none;
}

.page-about .tl-hint::before {
  content: "+";
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1px solid var(--line-700);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1;
  color: var(--lime-500);
}

.page-about .tl-item[open] .tl-hint::before {
  content: "−";
  border-color: var(--lime-500);
}

.page-about .tl-body {
  margin: 0;
  padding: 0 18px 18px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-text);
}

/* ---------- 团队 ---------- */
.page-about .team-figure,
.page-about .place-figure {
  margin: 0;
  min-width: 0;
}

.page-about .crew {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .crew-item {
  border: 1px solid var(--line-700);
  border-radius: var(--radius-md);
  padding: clamp(18px, 2.4vw, 26px);
  background: linear-gradient(165deg, rgba(18, 63, 52, .9), rgba(11, 43, 36, .68));
}

.page-about .crew-num {
  display: block;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--orange-500);
  margin-bottom: 10px;
}

.page-about .crew-item h3 {
  margin: 0 0 8px;
  font-size: 17px;
  color: var(--mist-100);
}

.page-about .crew-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
}

/* ---------- 流程 ---------- */
.page-about .flow {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .flow li {
  padding: clamp(16px, 2.2vw, 22px);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--lime-500);
  background: rgba(18, 63, 52, .48);
}

.page-about .flow li:nth-child(2) {
  border-left-color: var(--pitch-500);
}

.page-about .flow li:nth-child(3) {
  border-left-color: var(--orange-500);
}

.page-about .flow-time {
  display: block;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--sage-400);
  margin-bottom: 8px;
}

.page-about .flow h3 {
  margin: 0 0 8px;
  font-size: 16px;
  color: var(--mist-100);
}

.page-about .flow p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
}

/* ---------- 规模 ---------- */
.page-about .scale {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  margin-top: clamp(20px, 3vw, 32px);
  align-items: start;
}

.page-about .scale-main {
  border: 1px solid var(--line-700);
  border-radius: var(--radius-lg);
  padding: clamp(22px, 3.2vw, 34px);
  background: radial-gradient(420px 220px at 100% 0%, rgba(200, 255, 61, .16), transparent 70%), rgba(11, 43, 36, .7);
}

.page-about .scale-num {
  display: block;
  font-size: clamp(46px, 8vw, 92px);
  line-height: .88;
  letter-spacing: -.04em;
  color: var(--lime-500);
  margin-bottom: 14px;
}

.page-about .scale-main p {
  font-size: 15px;
  line-height: 1.75;
}

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

.page-about .scale-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-700);
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-text);
}

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

.page-about .scale-list .mono {
  font-size: 18px;
  color: var(--white);
  white-space: nowrap;
}

.page-about .scale-tail {
  margin-top: clamp(22px, 3vw, 32px);
  padding-left: clamp(14px, 2vw, 20px);
  border-left: 2px solid var(--pitch-500);
  font-size: 15px;
}

/* ---------- 共建 ---------- */
.page-about .join {
  border: 1px solid var(--line-700);
  border-radius: var(--radius-lg);
  padding: clamp(24px, 4vw, 48px);
  background: linear-gradient(142deg, rgba(200, 255, 61, .16), rgba(255, 122, 61, .1) 56%, rgba(18, 63, 52, .66));
}

.page-about .join .chapter-num {
  color: rgba(200, 255, 61, .2);
  -webkit-text-stroke: 1px var(--lime-500);
}

.page-about .join h2 {
  margin-top: 10px;
}

.page-about .join p {
  margin-top: 14px;
  max-width: 48em;
  font-size: 15px;
}

.page-about .join-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .crew {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .crew-item:nth-child(2) {
    margin-top: 18px;
  }

  .page-about .crew-item:nth-child(3) {
    margin-top: 36px;
  }

  .page-about .scale {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .hero-frame {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: center;
  }

  .page-about .sec-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  }

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

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .chapter-rail {
    position: sticky;
    top: clamp(94px, 12vh, 128px);
  }

  .page-about .rail-list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .chapter-link {
    white-space: normal;
  }

  .page-about .rail-note {
    display: block;
    writing-mode: vertical-rl;
    margin-top: 22px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: .32em;
    color: var(--lime-500);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .chapter-link,
  .page-about .filter-btn,
  .page-about .tl-item,
  .page-about .tl-item::before {
    transition: none;
  }
}
<<<END>>>