.page-about {
  --about-cut: 14px;
  --about-line: rgba(201, 162, 39, 0.22);
  --about-line-soft: rgba(201, 162, 39, 0.10);
  padding-bottom: clamp(56px, 7vw, 112px);
  overflow-x: hidden;
}

/* ---------- 报头 ---------- */
.page-about .about-head {
  padding-top: clamp(26px, 3.6vw, 54px);
}

.page-about .crumbs {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--grey);
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .crumbs a {
  color: var(--grey);
  text-decoration: none;
}

.page-about .crumbs a:hover {
  color: var(--gold-lt);
}

.page-about .crumbs__sep {
  color: rgba(201, 162, 39, 0.5);
}

.page-about .about-head__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 48px);
  margin-top: clamp(26px, 3.6vw, 48px);
  align-items: start;
}

.page-about .about-wordmark {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  line-height: 1;
}

.page-about .about-wordmark__brand {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(44px, 8.6vw, 88px);
  letter-spacing: -0.04em;
  color: var(--gold);
  display: block;
}

.page-about .about-wordmark__sub {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(14px, 1.5vw, 18px);
  letter-spacing: 0.44em;
  color: var(--cream);
  opacity: 0.72;
  display: block;
  padding-left: 4px;
}

.page-about .about-head__copy p {
  margin: 0 0 16px;
  color: var(--cream);
  font-size: var(--fs-body);
  line-height: 1.85;
  max-width: 62ch;
}

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

.page-about .about-head__copy .lede {
  font-size: clamp(16px, 1.3vw, 18.5px);
  color: #F6EFE0;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(30px, 4vw, 56px) 0 0;
  background: var(--about-line-soft);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-stats__cell {
  background: var(--ink);
  padding: clamp(18px, 2.4vw, 26px) clamp(12px, 1.8vw, 22px);
  position: relative;
}

.page-about .about-stats__cell::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22%;
  bottom: 22%;
  width: 2px;
  background: linear-gradient(180deg, var(--gold), rgba(53, 224, 214, 0.7));
}

.page-about .about-stats__key {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--grey);
}

.page-about .about-stats__val {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 2.2vw, 26px);
  color: var(--cream);
  letter-spacing: -0.01em;
}

.page-about .about-stats__val .mono {
  font-family: var(--font-mono);
  color: var(--cyan);
  font-weight: 500;
}

/* ---------- 横幅图 ---------- */
.page-about .about-banner {
  margin: clamp(38px, 5vw, 76px) auto 0;
}

.page-about .about-banner .figure__frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
  background: var(--ink-2);
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  filter: saturate(0.86) contrast(1.06) brightness(0.86);
}

.page-about .about-banner .figure__watermark {
  position: absolute;
  right: 18px;
  bottom: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  color: rgba(232, 199, 102, 0.62);
}

.page-about .about-banner .figure__caption {
  margin-top: 12px;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--grey);
}

/* ---------- 分栏 ---------- */
.page-about .about-stage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 4vw, 56px);
  margin-top: clamp(54px, 7vw, 104px);
  align-items: start;
}

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

.page-about .about-dir {
  border-left: 1px solid var(--about-line);
  padding-left: 18px;
  margin-bottom: 34px;
}

.page-about .about-dir .rail__title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.26em;
  color: var(--grey);
  margin: 0 0 12px;
}

.page-about .about-dir .rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.page-about .about-dir .rail__link {
  display: inline-block;
  font-size: 14px;
  color: var(--cream);
  opacity: 0.7;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color var(--dur) var(--ease), opacity var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-dir .rail__link:hover {
  opacity: 1;
  color: var(--gold-lt);
}

.page-about .about-dir .rail__link.is-active {
  opacity: 1;
  color: var(--gold-lt);
  border-bottom-color: var(--line-strong);
}

/* ---------- 时间轴 ---------- */
.page-about .about-tl .eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.26em;
  color: var(--grey);
  margin: 0 0 18px;
}

.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 0;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(201, 162, 39, 0.34) 55%, rgba(53, 224, 214, 0.55) 100%);
}

.page-about .tl__item {
  position: relative;
  padding-left: 34px;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 13px;
  height: 13px;
  background: var(--ink);
  border: 1px solid var(--gold);
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
}

.page-about .tl__item:nth-child(1) { margin-bottom: 8px; }
.page-about .tl__item:nth-child(2) { margin-bottom: 12px; }
.page-about .tl__item:nth-child(3) { margin-bottom: 18px; }
.page-about .tl__item:nth-child(4) { margin-bottom: 26px; }
.page-about .tl__item:nth-child(5) { margin-bottom: 36px; }
.page-about .tl__item:nth-child(6) { margin-bottom: 48px; }

.page-about .tl__node summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 0;
}

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

.page-about .tl__node summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  color: rgba(201, 162, 39, 0.66);
}

.page-about .tl__node[open] summary::after {
  content: "–";
}

.page-about .tl__ver {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan);
  letter-spacing: 0.08em;
}

.page-about .tl__when {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--grey);
}

.page-about .tl__body {
  margin-top: 10px;
  padding-left: 12px;
  border-left: 1px solid var(--about-line);
}

.page-about .tl__body p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(242, 232, 213, 0.78);
}

.page-about .tl__node summary:hover .tl__ver {
  color: var(--gold-lt);
}

/* ---------- 正文章节 ---------- */
.page-about .about-flow {
  min-width: 0;
}

.page-about .about-sec {
  position: relative;
  padding-top: clamp(28px, 3.4vw, 44px);
  margin-bottom: clamp(54px, 7vw, 96px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-sec__num {
  position: absolute;
  top: clamp(24px, 3vw, 38px);
  right: 0;
  font-family: var(--font-mono);
  font-size: clamp(38px, 6vw, 64px);
  line-height: 1;
  letter-spacing: -0.04em;
  color: rgba(201, 162, 39, 0.14);
  pointer-events: none;
  user-select: none;
}

.page-about .about-sec h2 {
  margin: 0 0 18px;
  color: var(--gold-lt);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-h2);
  letter-spacing: -0.01em;
  max-width: 22ch;
}

.page-about .about-sec p {
  margin: 0 0 16px;
  color: var(--cream);
  font-size: var(--fs-body);
  line-height: 1.85;
  max-width: 62ch;
}

.page-about .about-inline {
  color: var(--gold-lt);
  text-decoration: none;
  border-bottom: 1px solid rgba(232, 199, 102, 0.4);
}

.page-about .about-inline:hover {
  border-bottom-color: var(--gold-lt);
}

.page-about .about-plate {
  margin-top: 22px;
  padding: 18px 20px;
  background: var(--panel);
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
  max-width: 62ch;
}

.page-about .about-plate .tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  padding: 3px 10px;
  margin-bottom: 10px;
}

.page-about .about-plate p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(242, 232, 213, 0.8);
}

/* ---------- 内容线 ---------- */
.page-about .tracks {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin: 26px 0 30px;
}

.page-about .track {
  padding: 20px 20px 22px;
  background: var(--ink-2);
  border: 1px solid var(--about-line-soft);
  border-left: 2px solid var(--gold);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .track--violet { border-left-color: var(--violet); }
.page-about .track--cyan { border-left-color: var(--cyan); }

.page-about .track__tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--gold-lt);
}

.page-about .track--violet .track__tag { color: #A98CFF; }
.page-about .track--cyan .track__tag { color: var(--cyan); }

.page-about .track h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-h3);
  color: var(--cream);
}

.page-about .track p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
}

/* ---------- 配图 ---------- */
.page-about .about-fig {
  margin: 30px 0 0;
}

.page-about .about-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--about-line);
  background: var(--ink-2);
  clip-path: polygon(var(--about-cut) 0, 100% 0, 100% 100%, 0 100%, 0 var(--about-cut));
}

.page-about .about-frame--3x2 {
  aspect-ratio: 3 / 2;
}

.page-about .about-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.05) brightness(0.84);
}

.page-about .about-fig .figure__caption {
  margin-top: 11px;
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--grey);
}

/* ---------- 团队 ---------- */
.page-about .crew {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 26px 0 0;
}

.page-about .crew__card {
  padding: 20px;
  background: var(--panel);
  border: 1px solid var(--about-line-soft);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut-sm, 12px)), calc(100% - var(--about-cut-sm, 12px)) 100%, 0 100%);
}

.page-about .crew__role {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--gold-lt);
  letter-spacing: 0.02em;
}

.page-about .crew__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(242, 232, 213, 0.82);
}

.page-about .crew__facts {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: 26px 0 0;
  border-top: 1px dashed rgba(201, 162, 39, 0.24);
}

.page-about .crew__fact {
  padding: 16px 0;
  border-bottom: 1px dashed rgba(201, 162, 39, 0.24);
}

.page-about .crew__fact-key {
  margin: 0 0 7px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .crew__fact p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
}

/* ---------- 合作生态 ---------- */
.page-about .eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 26px;
  align-items: center;
}

.page-about .eco__ring {
  max-width: 240px;
  width: 100%;
  margin: 0 auto;
  aspect-ratio: 1 / 1;
}

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

.page-about .eco__lead {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.24em;
  color: var(--gold-lt);
}

.page-about .eco__steps {
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
  counter-reset: eco;
}

.page-about .eco__steps li {
  counter-increment: eco;
  position: relative;
  padding-left: 34px;
  margin-bottom: 12px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--cream);
}

.page-about .eco__steps li::before {
  content: counter(eco, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--violet);
}

.page-about .eco__note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--grey);
}

/* ---------- 节奏 ---------- */
.page-about .cadence {
  margin-top: 26px;
  border-top: 1px solid var(--about-line-soft);
}

.page-about .cadence__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 18px 0 18px 16px;
  border-bottom: 1px solid var(--about-line-soft);
  border-left: 2px solid rgba(201, 162, 39, 0.6);
}

.page-about .cadence__row--violet { border-left-color: var(--violet); }
.page-about .cadence__row--cyan { border-left-color: var(--cyan); }
.page-about .cadence__row--gold { border-left-color: var(--gold-lt); }

.page-about .cadence__key {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold-lt);
}

.page-about .cadence__row--violet .cadence__key { color: #A98CFF; }
.page-about .cadence__row--cyan .cadence__key { color: var(--cyan); }

.page-about .cadence__val {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--cream);
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  margin-top: clamp(40px, 5vw, 72px);
  padding: clamp(24px, 3.2vw, 38px);
  background: var(--ink-2);
  border: 1px solid var(--about-line);
  border-top: 2px solid var(--gold);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .about-next h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-h3);
  color: var(--gold-lt);
}

.page-about .about-next p {
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(242, 232, 213, 0.84);
  max-width: 62ch;
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-next__links .btn {
  text-decoration: none;
  display: inline-block;
  padding: 11px 20px;
  font-size: 14px;
  letter-spacing: 0.04em;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .cadence__row {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-head__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .tracks {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

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

  .page-about .crew__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 24px;
  }

  .page-about .eco {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 40px;
  }

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

@media (min-width: 1025px) {
  .page-about .about-stage {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(36px, 4.4vw, 72px);
  }

  .page-about .about-aside {
    position: sticky;
    top: var(--rail-top);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-dir .rail__link,
  .page-about .about-inline {
    transition: none;
  }
}
<<<END>>>

.page-about {
  --about-cut-sm: var(--about-cut);
}