.page-about {
  --about-pad: clamp(18px, 4vw, 44px);
  --about-rule: rgba(255, 194, 75, 0.16);
  --about-line-soft: rgba(244, 242, 234, 0.10);
  --about-text: rgba(244, 242, 234, 0.86);
  --about-text-dim: rgba(244, 242, 234, 0.64);
  display: block;
  color: var(--jade);
  background:
    radial-gradient(1100px 560px at 84% -8%, rgba(255, 194, 75, 0.10), transparent 62%),
    radial-gradient(860px 480px at -6% 34%, rgba(58, 209, 255, 0.055), transparent 60%);
}

.page-about .breadcrumb {
  padding-top: clamp(16px, 3vw, 26px);
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--about-text-dim);
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: rgba(255, 194, 75, 0.45);
}

.page-about .breadcrumb__item a {
  color: var(--about-text-dim);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .breadcrumb__item a:hover,
.page-about .breadcrumb__item a:focus-visible {
  color: var(--gold-pale);
}

.page-about .breadcrumb__item[aria-current="page"] {
  color: var(--gold);
}

/* ---------- 报头 ---------- */

.page-about .about-masthead {
  padding-top: clamp(30px, 5vw, 58px);
  padding-bottom: clamp(42px, 7vw, 86px);
}

.page-about .about-masthead__title {
  margin: 14px 0 0;
  max-width: 18em;
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5.4vw, 3.7rem);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.022em;
}

.page-about .about-masthead__title span {
  display: block;
  color: var(--gold);
  text-shadow: 0 0 30px rgba(255, 194, 75, 0.28);
}

.page-about .about-masthead .lede {
  max-width: 40em;
  margin-top: clamp(16px, 2.4vw, 24px);
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  line-height: 1.85;
  color: var(--about-text);
}

.page-about .about-masthead__visual {
  position: relative;
  width: min(100% - 2 * var(--about-pad), 1600px);
  margin: clamp(28px, 4.5vw, 52px) auto 0;
  overflow: hidden;
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-l);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), calc(100% - 34px) 100%, 0 100%);
  background: var(--ink-850);
}

.page-about .about-masthead__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(10, 10, 16, 0) 44%, rgba(10, 10, 16, 0.62) 100%);
}

.page-about .about-masthead__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 20 / 9;
  object-fit: cover;
}

/* ---------- 主体骨架 ---------- */

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
  padding-bottom: clamp(56px, 8vw, 110px);
}

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

.page-about .about-toc {
  min-width: 0;
  border-top: 1px solid var(--about-rule);
  padding-top: 14px;
}

.page-about .about-toc__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(255, 194, 75, 0.66);
}

.page-about .about-toc__list {
  display: flex;
  gap: 18px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc__list li {
  flex: 0 0 auto;
}

.page-about .about-toc a {
  display: block;
  white-space: nowrap;
  font-size: 0.88rem;
  color: var(--about-text-dim);
  text-decoration: none;
  padding: 3px 0;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--gold-pale);
  border-bottom-color: rgba(255, 194, 75, 0.6);
}

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 190px) minmax(0, 1fr);
    column-gap: clamp(36px, 5vw, 72px);
  }

  .page-about .about-toc {
    position: sticky;
    top: 104px;
    align-self: start;
    border-top: 0;
    border-left: 1px solid var(--about-rule);
    padding-top: 0;
    padding-left: 18px;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-toc a {
    white-space: normal;
    line-height: 1.5;
    padding: 5px 0;
  }
}

/* ---------- 章节 ---------- */

.page-about .about-section {
  padding-block: clamp(38px, 5.5vw, 72px);
  border-top: 1px solid var(--about-rule);
}

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

.page-about .about-section__head {
  max-width: 34em;
}

.page-about .about-section__head .section-title {
  margin: 10px 0 0;
  font-family: var(--font-serif);
  font-size: clamp(1.42rem, 2.7vw, 2.05rem);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.012em;
  color: var(--jade);
}

.page-about .eyebrow {
  color: rgba(255, 194, 75, 0.78);
}

.page-about .prose {
  max-width: 38em;
  margin-top: clamp(18px, 2.6vw, 26px);
}

.page-about .prose p {
  margin: 0 0 1.05em;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--about-text);
}

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

.page-about .prose a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(58, 209, 255, 0.35);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

.page-about .about-callout {
  padding: 16px 20px;
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--radius-m) var(--radius-m) 0;
  background: linear-gradient(90deg, rgba(255, 194, 75, 0.10), rgba(255, 194, 75, 0.02));
  font-size: 0.96rem;
  line-height: 1.78;
  color: var(--about-text);
}

.page-about .about-callout strong {
  color: var(--gold-pale);
}

.page-about .about-note {
  margin-top: 22px;
  padding-top: 14px;
  border-top: 1px dashed var(--about-rule);
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--about-text-dim);
}

/* ---------- 阶段轨道 ---------- */

.page-about .stage-track {
  display: flex;
  gap: 16px;
  margin: clamp(24px, 3.5vw, 36px) 0 0;
  padding: 4px 4px 18px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
}

.page-about .stage-card {
  position: relative;
  flex: 1 0 clamp(206px, 24vw, 254px);
  scroll-snap-align: start;
  padding: 24px 20px 26px;
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-m);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.012));
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .stage-card::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 20px;
  width: 36px;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), rgba(255, 194, 75, 0));
}

.page-about .stage-card:nth-child(even) {
  margin-top: 18px;
}

.page-about .stage-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 194, 75, 0.5);
}

.page-about .stage-card__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .stage-card__title {
  margin: 10px 0 8px;
  font-size: 1.08rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--jade);
}

.page-about .stage-card__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--about-text-dim);
}

/* ---------- 双栏与图 ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.6vw, 40px);
  align-items: start;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-split .prose {
  margin-top: 0;
}

@media (min-width: 880px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 1fr);
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 1fr);
  }
}

.page-about .about-figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-m);
  background: var(--ink-850);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  transition: transform 340ms var(--ease);
}

.page-about .about-figure:hover img {
  transform: scale(1.035);
}

.page-about .about-figure__cap {
  display: block;
  padding: 10px 16px 12px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--about-text-dim);
  border-top: 1px solid var(--about-line-soft);
}

/* ---------- 机型档位 ---------- */

.page-about .tier-list {
  display: grid;
  gap: 12px;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
}

.page-about .tier-item {
  padding: 15px 18px;
  border-left: 2px solid var(--gold);
  border-radius: 0 var(--radius-m) var(--radius-m) 0;
  background: linear-gradient(90deg, rgba(255, 194, 75, 0.09), rgba(255, 194, 75, 0));
}

.page-about .tier-item dt {
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--gold-pale);
}

.page-about .tier-item dd {
  margin: 5px 0 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--about-text-dim);
}

/* ---------- 权益九宫格 ---------- */

.page-about .rights-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 640px) {
  .page-about .rights-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1040px) {
  .page-about .rights-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .rights-cell {
  position: relative;
  padding: 18px 18px 20px;
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-m);
  background: rgba(20, 20, 28, 0.74);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .rights-cell:hover,
.page-about .rights-cell:focus-within {
  border-color: rgba(255, 194, 75, 0.55);
  background: rgba(26, 26, 36, 0.92);
  transform: translateY(-3px);
}

.page-about .rights-cell__name {
  margin: 10px 0 0;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.015em;
  color: var(--jade);
}

.page-about .rights-cell__desc {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--about-text-dim);
  transition: max-height 260ms var(--ease), opacity 220ms var(--ease), margin-top 260ms var(--ease);
}

.page-about .rights-cell:hover .rights-cell__desc,
.page-about .rights-cell:focus-within .rights-cell__desc {
  margin-top: 8px;
  max-height: 8em;
  opacity: 1;
}

@media (hover: none) {
  .page-about .rights-cell__desc {
    margin-top: 8px;
    max-height: none;
    opacity: 1;
  }
}

/* ---------- 团队 ---------- */

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin: clamp(24px, 3.6vw, 36px) 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 700px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .team-cell {
  padding-top: 16px;
  border-top: 2px solid var(--about-rule);
}

.page-about .team-cell__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 3vw, 2.35rem);
  line-height: 1;
  color: var(--gold);
  letter-spacing: -0.02em;
}

.page-about .team-cell__name {
  margin: 10px 0 8px;
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--jade);
}

.page-about .team-cell__text {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.72;
  color: var(--about-text-dim);
}

/* ---------- 常用入口 ---------- */

.page-about .entry-list {
  display: grid;
  gap: 0;
  margin: clamp(22px, 3.4vw, 32px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-rule);
}

.page-about .entry-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 20px 4px;
  border-bottom: 1px solid var(--about-rule);
  transition: background var(--dur) var(--ease);
}

.page-about .entry-item:hover {
  background: linear-gradient(90deg, rgba(255, 194, 75, 0.06), rgba(255, 194, 75, 0));
}

.page-about .entry-item__no {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  color: var(--red);
  padding-top: 3px;
}

.page-about .entry-item__title {
  margin: 0 0 6px;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--jade);
}

.page-about .entry-item__body p {
  margin: 0;
  max-width: 34em;
  font-size: 0.9rem;
  line-height: 1.74;
  color: var(--about-text-dim);
}

/* ---------- 收尾 ---------- */

.page-about .about-tail {
  margin: clamp(34px, 5vw, 56px) 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--about-rule);
  font-size: 0.94rem;
  line-height: 1.9;
  color: var(--about-text-dim);
}

.page-about .about-tail a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(58, 209, 255, 0.35);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about .stage-card,
  .page-about .rights-cell,
  .page-about .about-figure img {
    transition: none;
  }

  .page-about .stage-card:hover,
  .page-about .rights-cell:hover {
    transform: none;
  }
}
<<<END>>>