.page-about {
  --rail: 240px;
  --rail-gap: 24px;
  position: relative;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(36px, 6vw, 64px) 0 clamp(44px, 7vw, 84px);
  background: linear-gradient(180deg, var(--pitch-ink) 0%, #0a1a13 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__slash {
  position: absolute;
  top: -16%;
  right: -8%;
  width: min(780px, 82%);
  height: 132%;
  background: linear-gradient(155deg, var(--panel-deep) 0%, rgba(30, 92, 63, 0.55) 58%, rgba(11, 31, 23, 0) 100%);
  clip-path: polygon(28% 0, 100% 0, 100% 100%, 0 100%);
  opacity: 0.88;
  pointer-events: none;
}

.page-about .about-hero__spark {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 46%;
  height: 4px;
  background: linear-gradient(90deg, var(--score), rgba(255, 106, 43, 0));
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  max-width: 20ch;
  font-size: clamp(30px, 5.2vw, 58px);
  font-weight: 200;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--warm);
}

.page-about .about-hero__title-strong {
  display: block;
  margin-top: 6px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--warm);
}

.page-about .about-hero__deck {
  margin: 22px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(243, 236, 221, 0.76);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 36px;
  margin: 30px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__meta li {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-hero__meta strong {
  font-size: 15px;
  font-weight: 700;
  color: var(--warm);
  letter-spacing: 0.01em;
}

/* ---------- 页面骨架 ---------- */
.page-about .about-shell {
  padding-top: clamp(44px, 7vw, 88px);
  padding-bottom: clamp(56px, 9vw, 110px);
}

.page-about .about-rail {
  margin-bottom: 28px;
}

.page-about .about-rail > .index-label {
  margin: 0 0 10px;
}

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

.page-about .about-rail a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 10px;
  border-left: 1px solid var(--line-soft);
  color: var(--stone);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .about-rail a span {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--stone);
}

.page-about .about-rail a:hover {
  color: var(--warm);
  border-left-color: var(--neon);
}

.page-about .about-rail a[aria-current="true"] {
  color: var(--warm);
  border-left-color: var(--neon);
  background: linear-gradient(90deg, rgba(47, 179, 122, 0.14), rgba(47, 179, 122, 0));
}

.page-about .about-body {
  display: grid;
  gap: clamp(36px, 5.5vw, 68px);
  min-width: 0;
}

/* ---------- 面板与章节头 ---------- */
.page-about .about-panel {
  padding: clamp(22px, 3.2vw, 40px);
  min-width: 0;
}

.page-about .about-panel p {
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(243, 236, 221, 0.78);
}

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

.page-about .sec-head {
  position: relative;
  margin: 0 0 20px;
  padding-top: clamp(34px, 5vw, 52px);
}

.page-about .sec-num {
  position: absolute;
  left: -2px;
  top: 0;
  font-family: var(--mono);
  font-size: clamp(52px, 8vw, 92px);
  font-weight: 200;
  line-height: 1;
  letter-spacing: -0.03em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(243, 236, 221, 0.24);
  pointer-events: none;
  user-select: none;
}

.page-about .sec-title {
  position: relative;
  margin: 0;
  font-size: clamp(21px, 3vw, 30px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--warm);
}

/* ---------- 01 固定位置 ---------- */
.page-about .fix-list {
  display: grid;
  gap: 18px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .fix-list li {
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .fix-list b {
  display: block;
  margin-bottom: 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--warm);
}

.page-about .fix-list span {
  display: block;
  font-size: 14px;
  line-height: 1.75;
  color: var(--stone);
}

/* ---------- 02 团队 ---------- */
.page-about .crew {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.page-about .crew__card {
  border: 1px solid var(--line);
  background: rgba(18, 58, 42, 0.55);
  padding: 18px 18px 16px;
  min-width: 0;
}

.page-about .crew__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.page-about .crew__name {
  margin: 0;
  font-size: 16px;
  font-weight: 800;
  color: var(--warm);
}

.page-about .crew__count {
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 500;
  line-height: 1;
  color: var(--neon);
}

.page-about .crew__card p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(243, 236, 221, 0.72);
}

.page-about .crew details {
  margin-top: 14px;
  padding-top: 10px;
  border-top: 1px solid var(--line-soft);
}

.page-about .crew summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

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

.page-about .crew summary::after {
  content: " +";
}

.page-about .crew details[open] summary::after {
  content: " −";
}

.page-about .crew ul {
  margin: 10px 0 0;
  padding-left: 16px;
}

.page-about .crew li {
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(243, 236, 221, 0.7);
}

.page-about .scoreband {
  margin-top: 22px;
}

.page-about .team-figure {
  margin: 26px 0 0;
}

/* ---------- 03 时间轴（横向打断） ---------- */
.page-about .about-timeline {
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, #0e2b20 0%, #0b1f17 100%);
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.16;
  pointer-events: none;
}

.page-about .about-timeline__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.35) contrast(1.05);
}

.page-about .about-timeline__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-timeline__deck {
  max-width: 62ch;
  color: rgba(243, 236, 221, 0.78);
}

.page-about .tl-track {
  display: grid;
  gap: 0;
  margin-top: 30px;
}

.page-about .tl-node {
  position: relative;
  padding: 0 0 28px 22px;
  border-left: 1px solid var(--line-strong);
  outline: none;
}

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

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 0 4px rgba(47, 179, 122, 0.14);
  transition: background 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-about .tl-node:hover::before,
.page-about .tl-node:focus-visible::before {
  background: var(--score);
  box-shadow: 0 0 0 5px rgba(255, 106, 43, 0.18);
}

.page-about .tl-node:focus-visible {
  box-shadow: inset 0 0 0 1px rgba(47, 179, 122, 0.4);
}

.page-about .tl-time {
  display: block;
  font-family: var(--mono);
  font-size: 19px;
  letter-spacing: 0.02em;
  color: var(--score);
}

.page-about .tl-title {
  margin: 8px 0 10px;
  font-size: 16px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--warm);
}

.page-about .tl-node p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(243, 236, 221, 0.74);
}

.page-about .tl-list {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .tl-list li {
  position: relative;
  padding-left: 14px;
  margin-bottom: 6px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--stone);
}

.page-about .tl-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 6px;
  height: 1px;
  background: var(--amber);
}

/* ---------- 04 内容准则 ---------- */
.page-about .rule-list {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .rule-list li {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 12px;
  padding: 16px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .rule-list__tag {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber);
  padding-top: 3px;
}

.page-about .rule-list h3 {
  margin: 0 0 6px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--warm);
}

.page-about .rule-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(243, 236, 221, 0.72);
}

/* ---------- 05 覆盖 ---------- */
.page-about .cov-figure {
  margin: 24px 0 8px;
}

.page-about .cov-grid {
  display: grid;
  gap: 0;
  margin: 20px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .cov-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .cov-item dt {
  font-size: 15px;
  font-weight: 700;
  color: var(--warm);
}

.page-about .cov-item dd {
  margin: 0;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--stone);
  white-space: nowrap;
}

.page-about .cov-note {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 06 演进 ---------- */
.page-about .evo {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .evo li {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .evo__tag {
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: 0.08em;
  color: var(--amber);
  padding-top: 3px;
}

.page-about .evo__body h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--warm);
}

.page-about .evo__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(243, 236, 221, 0.72);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta .sec-head {
  padding-top: 0;
  margin-bottom: 14px;
}

.page-about .about-cta .sec-title {
  color: var(--pitch-ink);
}

.page-about .about-cta p {
  color: rgba(11, 31, 23, 0.78);
  max-width: 52ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .fix-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .cov-grid {
    grid-template-columns: 1fr 1fr;
    column-gap: 36px;
  }
}

@media (min-width: 820px) {
  .page-about .crew {
    grid-template-columns: 2fr 1fr 1fr;
    gap: 16px;
  }

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

  .page-about .tl-node {
    padding: 26px 30px 0 0;
    border-left: 0;
    border-top: 1px solid var(--line-strong);
  }

  .page-about .tl-node::before {
    left: 0;
    top: -5px;
    width: 10px;
    height: 10px;
  }
}

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

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--bar-h) + var(--strip-h) + 32px);
    margin-bottom: 0;
    display: block;
  }

  .page-about .about-rail ol {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail a {
    white-space: normal;
    padding: 9px 10px;
  }

  .page-about .about-panel--break {
    margin-left: calc(-1 * (var(--rail) + var(--rail-gap)));
    width: calc(100% + var(--rail) + var(--rail-gap));
    padding-left: calc(var(--pad) + 24px);
    padding-right: calc(var(--pad) + 24px);
  }
}

@media (min-width: 1100px) {
  .page-about .about-timeline .sec-title {
    font-size: 34px;
  }

  .page-about .evo li {
    grid-template-columns: 96px 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail a,
  .page-about .tl-node::before {
    transition: none;
  }
}
<<<PAGE_CSS_END>>>