.page-about {
  --about-rail: 216px;
  --about-gap: clamp(20px, 3.4vw, 44px);
  --about-rule: rgba(199, 160, 58, 0.28);
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(26px, 4vw, 48px) 0 clamp(40px, 6vw, 78px);
  background:
    radial-gradient(115% 130% at 6% -12%, #1d2d61 0%, rgba(11, 22, 51, 0) 62%),
    var(--ink);
  border-bottom: 1px solid var(--indigo-mid);
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: center;
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
  }
}

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

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(29px, 4.5vw, 54px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-hero h1::after {
  content: "";
  display: block;
  width: 72px;
  height: 4px;
  margin-top: 22px;
  border-radius: 2px;
  background: var(--cinnabar);
}

.page-about .about-hero .lede {
  margin: 22px 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.82;
  color: rgba(244, 239, 228, 0.82);
}

.page-about .about-hero__claims {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.page-about .about-hero__media {
  margin: 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--indigo-mid);
  box-shadow: var(--shadow-float);
  background: var(--indigo-deep);
}

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

/* ---------- 主体：左锚点 + 窄列阅读 ---------- */
.page-about .about-main {
  padding: clamp(46px, 6vw, 88px) 0 clamp(26px, 3vw, 44px);
}

.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

@media (min-width: 1024px) {
  .page-about .about-grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
  }
}

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

@media (min-width: 1024px) {
  .page-about .about-rail {
    position: sticky;
    top: 104px;
    align-self: start;
    padding-left: 18px;
    border-left: 1px solid var(--about-rule);
  }
}

.page-about .about-rail__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .about-rail__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: rail;
}

@media (min-width: 1024px) {
  .page-about .about-rail__list {
    flex-direction: column;
    gap: 1px;
  }
}

.page-about .about-rail__list li {
  counter-increment: rail;
  min-width: 0;
}

.page-about .about-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 12px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  line-height: 1.5;
  color: rgba(244, 239, 228, 0.7);
  text-decoration: none;
  transition: color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .about-rail__list a::before {
  content: counter(rail, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--paper);
  background: rgba(46, 125, 116, 0.26);
}

.page-about .about-read {
  min-width: 0;
  max-width: 72ch;
}

.page-about .about-read h2 {
  margin: 0 0 18px;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(23px, 3vw, 34px);
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-read p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.82;
  color: rgba(244, 239, 228, 0.8);
}

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

/* ---------- 三条支撑 ---------- */
.page-about .claim-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 720px) {
  .page-about .claim-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .claim {
  padding: 22px 20px 24px;
  border-radius: var(--radius-card);
  border: 1px solid var(--indigo-mid);
  background: linear-gradient(165deg, rgba(31, 50, 102, 0.92), rgba(11, 22, 51, 0.72));
}

.page-about .claim-k {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 17px;
  color: var(--gold-soft);
}

.page-about .claim p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: rgba(244, 239, 228, 0.74);
}

/* ---------- 四个建设阶段 ---------- */
.page-about .about-stages {
  padding: clamp(46px, 6vw, 88px) 0;
  background: linear-gradient(180deg, var(--ink) 0%, var(--indigo-deep) 52%, var(--ink) 100%);
  border-top: 1px solid var(--indigo-mid);
  border-bottom: 1px solid var(--indigo-mid);
}

.page-about .section-head {
  max-width: 70ch;
  margin: 0 0 clamp(24px, 3.4vw, 40px);
}

.page-about .section-head .eyebrow {
  color: var(--gold);
}

.page-about .section-title {
  font-family: var(--font-serif);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .section-sub {
  color: rgba(244, 239, 228, 0.72);
}

.page-about .stage-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

@media (min-width: 900px) {
  .page-about .stage-flow {
    grid-template-columns: 1.16fr 0.9fr 1.24fr 1fr;
    gap: 16px;
    align-items: start;
  }
}

.page-about .stage {
  border: 1px solid var(--indigo-mid);
  border-radius: var(--radius-card);
  background: rgba(11, 22, 51, 0.74);
  overflow: hidden;
}

.page-about .stage::before {
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--jade-a), var(--jade-b));
}

.page-about .stage summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  gap: 10px;
  padding: 20px 18px 16px;
}

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

.page-about .stage-index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .stage-name {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .stage-toggle {
  position: relative;
  justify-self: start;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid var(--about-rule);
  transition: border-color 0.2s var(--ease);
}

.page-about .stage-toggle::before,
.page-about .stage-toggle::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 7px;
  right: 7px;
  height: 1.5px;
  background: var(--gold);
  transform: translateY(-50%);
}

.page-about .stage-toggle::after {
  transform: translateY(-50%) rotate(90deg);
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}

.page-about .stage[open] .stage-toggle::after {
  transform: translateY(-50%) rotate(0deg);
  opacity: 0;
}

.page-about .stage summary:hover .stage-toggle,
.page-about .stage summary:focus-visible .stage-toggle {
  border-color: var(--gold);
}

.page-about .stage-body {
  padding: 16px 18px 20px;
  border-top: 1px solid var(--indigo-mid);
}

.page-about .stage-body p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.74;
  color: rgba(244, 239, 228, 0.78);
}

.page-about .stage-body a {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--jade-b);
  text-decoration: none;
  border-bottom: 1px solid rgba(134, 201, 184, 0.42);
  padding-bottom: 2px;
}

.page-about .stage-body a:hover,
.page-about .stage-body a:focus-visible {
  color: var(--gold-soft);
  border-bottom-color: var(--gold-soft);
}

.page-about .stage-figure {
  margin: clamp(26px, 4vw, 44px) 0 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--indigo-mid);
  background: var(--ink);
}

.page-about .stage-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .stage-figure figcaption {
  padding: 12px 18px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--index-gray);
  background: rgba(11, 22, 51, 0.86);
}

/* ---------- 旧版本线索 ---------- */
.page-about .about-archive {
  padding: clamp(46px, 6vw, 88px) 0;
}

.page-about .about-archive__body p {
  font-size: 16px;
  line-height: 1.84;
  color: rgba(244, 239, 228, 0.8);
}

.page-about .archive-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
  gap: 1px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  background: var(--indigo-mid);
  border: 1px solid var(--indigo-mid);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.page-about .archive-stats .stat {
  display: grid;
  gap: 6px;
  padding: 20px 18px 22px;
  background: var(--indigo-deep);
}

.page-about .archive-stats .stat-value {
  font-family: var(--font-mono);
  font-size: clamp(23px, 3vw, 31px);
  line-height: 1.1;
  letter-spacing: 0.04em;
  color: var(--gold);
}

.page-about .archive-stats .stat-label {
  font-size: 13px;
  line-height: 1.62;
  color: var(--index-gray);
}

.page-about .about-archive .note {
  margin: 24px 0 0;
  font-size: 14px;
  line-height: 1.76;
}

/* ---------- 维护分工 ---------- */
.page-about .about-team {
  padding: clamp(46px, 6vw, 88px) 0;
  background: var(--indigo-deep);
  border-top: 1px solid var(--indigo-mid);
  border-bottom: 1px solid var(--indigo-mid);
}

.page-about .team-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

@media (min-width: 980px) {
  .page-about .team-split {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .team-table {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--indigo-mid);
}

.page-about .team-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 16px;
  align-items: baseline;
  padding: 18px 0;
  border-bottom: 1px solid var(--indigo-mid);
}

@media (min-width: 700px) {
  .page-about .team-row {
    grid-template-columns: 74px 168px minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .team-num {
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--gold);
}

.page-about .team-role {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .team-desc {
  font-size: 14px;
  line-height: 1.72;
  color: rgba(244, 239, 228, 0.74);
}

.page-about .team-check {
  padding: 26px 24px 28px;
  border-radius: var(--radius-card);
  border: 1px solid rgba(134, 201, 184, 0.36);
  background: linear-gradient(150deg, rgba(46, 125, 116, 0.42), rgba(134, 201, 184, 0.12));
}

.page-about .team-check h3 {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .team-check > p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: rgba(244, 239, 228, 0.8);
}

.page-about .team-check ol {
  counter-reset: check;
  display: grid;
  gap: 14px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .team-check li {
  counter-increment: check;
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(244, 239, 228, 0.9);
}

.page-about .team-check li::before {
  content: counter(check);
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--jade-b);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1;
}

/* ---------- 覆盖与更新节奏 ---------- */
.page-about .about-reach {
  padding: clamp(46px, 6vw, 88px) 0;
}

.page-about .reach-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

@media (min-width: 980px) {
  .page-about .reach-split {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: center;
  }
}

.page-about .reach-copy {
  min-width: 0;
}

.page-about .reach-lede {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.82;
  color: rgba(244, 239, 228, 0.8);
}

.page-about .rhythm-list {
  display: grid;
  gap: 0;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .rhythm-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px dashed var(--indigo-mid);
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(244, 239, 228, 0.78);
}

@media (min-width: 640px) {
  .page-about .rhythm-list li {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }
}

.page-about .rhythm-key {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .reach-media {
  margin: 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--indigo-mid);
  background: var(--indigo-deep);
}

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

.page-about .reach-media figcaption {
  padding: 12px 18px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--index-gray);
  background: rgba(11, 22, 51, 0.86);
}

/* ---------- 内容合作 ---------- */
.page-about .about-partners {
  padding: clamp(46px, 6vw, 88px) 0;
  background: linear-gradient(180deg, var(--ink) 0%, var(--indigo-deep) 100%);
  border-top: 1px solid var(--indigo-mid);
}

.page-about .partner-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 0 0 clamp(28px, 4vw, 46px);
  padding: 0;
  list-style: none;
}

@media (min-width: 700px) {
  .page-about .partner-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

.page-about .partner-tile {
  aspect-ratio: 1 / 1;
  border-radius: 10px;
  border: 1px solid rgba(31, 50, 102, 0.9);
  background: rgba(31, 50, 102, 0.55);
  transition: transform 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .partner-tile:nth-child(3n + 1) {
  background: rgba(46, 125, 116, 0.3);
}

.page-about .partner-tile:nth-child(3n + 2) {
  background: rgba(199, 160, 58, 0.16);
}

.page-about .partner-tile:nth-child(3n) {
  background: rgba(182, 59, 46, 0.18);
}

.page-about .partner-tile:hover {
  transform: translateY(-3px);
  background: rgba(134, 201, 184, 0.34);
  border-color: rgba(134, 201, 184, 0.5);
}

.page-about .partner-ways {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

@media (min-width: 780px) {
  .page-about .partner-ways {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .partner-way {
  padding: 22px 20px 24px;
  border-radius: var(--radius-card);
  border: 1px solid var(--indigo-mid);
  background: rgba(11, 22, 51, 0.72);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .partner-way:hover {
  border-color: rgba(134, 201, 184, 0.45);
  background: rgba(20, 34, 74, 0.86);
}

.page-about .partner-way h3 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
  color: var(--gold-soft);
}

.page-about .partner-way p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: rgba(244, 239, 228, 0.76);
}

.page-about .about-cta {
  display: grid;
  gap: 14px;
  margin-top: clamp(30px, 4vw, 52px);
  padding: clamp(24px, 3.4vw, 38px);
  border-radius: var(--radius-card);
  border: 1px solid rgba(134, 201, 184, 0.36);
  background: linear-gradient(140deg, rgba(46, 125, 116, 0.5), rgba(20, 34, 74, 0.92));
}

.page-about .about-cta h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.36;
  color: var(--paper);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(244, 239, 228, 0.86);
}

.page-about .about-cta .btn {
  justify-self: start;
}

/* ---------- 窄屏收口 ---------- */
@media (max-width: 560px) {
  .page-about .about-hero h1::after {
    width: 54px;
    margin-top: 18px;
  }

  .page-about .claim,
  .page-about .partner-way,
  .page-about .team-check {
    padding-left: 16px;
    padding-right: 16px;
  }

  .page-about .team-num {
    font-size: 22px;
  }
}
<<<END>>>