.page-about {
  --about-rail-w: 196px;
  --about-muted: rgba(192, 155, 221, 0.8);
  --about-muted-dark: var(--gray-500);
  background: var(--ink-900);
  color: var(--paper-050);
}

.page-about .mono {
  font-family: var(--font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.page-about .text-link {
  color: var(--blue-700);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
}

.page-about .about-hero .text-link,
.page-about .story-text .text-link,
.page-about .team-note .text-link,
.page-about .season-note__text .text-link {
  color: var(--green-500);
}

.page-about .text-link:hover,
.page-about .text-link:focus-visible {
  color: var(--blue-500);
  outline: none;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 28px 0 clamp(40px, 6vw, 76px);
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(107, 46, 138, 0.62), transparent 62%),
    radial-gradient(80% 70% at 0% 100%, rgba(46, 107, 230, 0.12), transparent 60%),
    linear-gradient(180deg, var(--grape-950) 0%, var(--ink-900) 72%);
  border-bottom: 1px solid var(--line-dark);
}

.page-about .breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(24px, 4vw, 44px);
  padding: 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--about-muted);
}

.page-about .breadcrumb li::after {
  content: "/";
  margin-left: 8px;
  color: var(--line-dark);
}

.page-about .breadcrumb li:last-child::after {
  content: none;
}

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

.page-about .breadcrumb a:hover {
  color: var(--paper-050);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--gold-400);
}

.page-about .hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
}

.page-about .hero-anchor {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .hero-anchor__label {
  font-size: 12px;
  color: var(--about-muted);
}

.page-about .hero-year {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(72px, 16vw, 160px);
  line-height: 0.84;
  letter-spacing: -0.05em;
  background: linear-gradient(160deg, var(--paper-050) 20%, var(--gold-400) 70%, var(--grape-300));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .hero-anchor__note {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--about-muted);
  border-left: 2px solid var(--grape-700);
  padding-left: 10px;
}

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

.page-about .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--green-500);
}

.page-about .eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--green-500);
}

.page-about .hero-copy h1 {
  margin: 0 0 18px;
  font-size: clamp(30px, 5.4vw, 54px);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--paper-050);
}

.page-about .hero-lede {
  max-width: 34em;
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(247, 244, 250, 0.86);
}

.page-about .hero-facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 26px;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .hero-facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--about-muted);
}

.page-about .hero-facts b {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--gold-400);
}

.page-about .hero-ruler {
  margin-top: clamp(28px, 5vw, 56px);
  height: 16px;
  border-top: 1px solid var(--line-dark);
  background-image: repeating-linear-gradient(90deg, var(--line-dark) 0 1px, transparent 1px 26px);
  background-size: 100% 9px;
  background-repeat: no-repeat;
}

/* ---------- 布局与章节索引 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 48px);
  padding-top: clamp(20px, 3vw, 36px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .about-rail {
  position: sticky;
  top: 0;
  z-index: 6;
  margin-inline: calc(var(--shell-x) * -1);
  padding: 10px var(--shell-x);
  background: var(--ink-900);
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-rail__label {
  display: none;
  margin: 0 0 12px;
  font-size: 11px;
  color: var(--about-muted);
}

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

.page-about .about-toc::-webkit-scrollbar {
  display: none;
}

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

.page-about .about-toc__link {
  display: flex;
  align-items: center;
  gap: 7px;
  min-height: 44px;
  padding: 8px 12px;
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  color: var(--about-muted);
  background: rgba(192, 155, 221, 0.08);
  border-bottom: 2px solid transparent;
  transition: color 180ms var(--ease), background 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-toc__num {
  font-size: 11px;
  color: var(--grape-300);
}

.page-about .about-toc__link.is-active,
.page-about .about-toc__link[aria-current="true"] {
  color: var(--paper-050);
  font-weight: 700;
  background: rgba(107, 46, 138, 0.5);
  border-bottom-color: var(--green-500);
}

.page-about .about-toc__link.is-active .about-toc__num,
.page-about .about-toc__link[aria-current="true"] .about-toc__num {
  color: var(--gold-400);
}

.page-about .about-toc__link:hover {
  color: var(--paper-050);
}

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

.page-about .about-section {
  padding-block: clamp(36px, 5vw, 68px);
  border-top: 1px solid var(--line-dark);
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: clamp(16px, 3vw, 30px);
}

/* ---------- 章节头 ---------- */
.page-about .about-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(22px, 3vw, 34px);
  border-left: 1px solid var(--grape-700);
  padding-left: 16px;
}

.page-about .about-head__num {
  font-size: 12px;
  color: var(--gold-400);
}

.page-about .about-head__title {
  margin: 0;
  font-size: clamp(23px, 3.6vw, 34px);
  line-height: 1.24;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.page-about .about-head__lede {
  max-width: 34em;
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-muted);
}

.page-about .about-head--dark {
  border-left-color: var(--grape-700);
}

.page-about .about-head--dark .about-head__num {
  color: var(--grape-700);
}

.page-about .about-head--dark .about-head__lede {
  color: var(--about-muted-dark);
}

/* ---------- 章节一 ---------- */
.page-about .story-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 34px);
}

.page-about .story-text p {
  max-width: 34em;
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(247, 244, 250, 0.86);
}

.page-about .story-link {
  margin-top: 20px;
}

.page-about .story-media .media__caption,
.page-about .timeline-media .media__caption,
.page-about .process-media .media__caption {
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  margin-top: 10px;
  color: var(--about-muted);
}

.page-about .media__frame {
  overflow: hidden;
  border: 1px solid var(--line-dark);
}

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

/* ---------- 纸面面板 ---------- */
.page-about .about-paper {
  background: var(--paper-050);
  color: var(--ink-900);
  border: 1px solid var(--line-light);
  padding: clamp(22px, 4vw, 44px);
}

.page-about .about-paper .media__frame {
  border-color: var(--line-light);
}

.page-about .about-paper .media__caption {
  color: var(--about-muted-dark);
}

/* ---------- 时间线 ---------- */
.page-about .timeline-media {
  margin: 0 0 clamp(24px, 3vw, 36px);
}

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

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 10px;
  width: 1px;
  background: var(--line-light);
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 clamp(20px, 3vw, 30px) 34px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 13px;
  height: 13px;
  background: var(--paper-050);
  border: 1px solid var(--grape-700);
  transition: background 200ms var(--ease), border-color 200ms var(--ease);
}

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

.page-about .tl-year {
  display: block;
  margin-bottom: 6px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--grape-700);
}

.page-about .tl-title {
  margin: 0 0 6px;
  font-size: 16px;
  line-height: 1.5;
  font-weight: 700;
  color: var(--ink-900);
}

.page-about .tl-text {
  max-width: 34em;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--gray-500);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
}

.page-about .team-cell {
  background: var(--ink-900);
  padding: 24px 20px;
}

.page-about .team-num {
  display: block;
  font-size: clamp(40px, 7vw, 62px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold-400);
}

.page-about .team-role {
  margin: 12px 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper-050);
}

.page-about .team-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--about-muted);
}

.page-about .team-note {
  margin: 20px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--about-muted);
}

/* ---------- 流程 ---------- */
.page-about .process-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
}

.page-about .process-steps {
  display: grid;
  gap: 10px;
  min-width: 0;
}

.page-about .step {
  border: 1px solid var(--line-dark);
  background: rgba(42, 14, 56, 0.4);
  transition: border-color 200ms var(--ease), background 200ms var(--ease);
}

.page-about .step[open] {
  border-color: var(--grape-300);
  background: rgba(42, 14, 56, 0.82);
}

.page-about .step__head {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .step__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--green-500);
}

.page-about .step[open] .step__head::after {
  content: "\2212";
}

.page-about .step__num {
  font-size: 11px;
  color: var(--grape-300);
}

.page-about .step__title {
  font-size: 16px;
  font-weight: 700;
  color: var(--paper-050);
}

.page-about .step__body {
  padding: 0 16px 18px;
  border-top: 1px solid var(--line-dark-soft);
}

.page-about .step__body p {
  margin: 14px 0 10px;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(247, 244, 250, 0.82);
}

.page-about .step__body ul {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 6px;
}

.page-about .step__body li {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--about-muted);
}

.page-about .step__body li::marker {
  color: var(--green-500);
}

.page-about .process-media {
  margin: 0;
}

/* ---------- 原则 ---------- */
.page-about .principles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-light);
  border-top: 1px solid var(--line-light);
}

.page-about .principle {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 12px;
  background: var(--paper-050);
  padding: 18px 0;
}

.page-about .principle__num {
  font-size: 12px;
  font-weight: 700;
  color: var(--grape-700);
  padding-top: 3px;
}

.page-about .principle__title {
  margin: 0 0 6px;
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink-900);
}

.page-about .principle__text {
  max-width: 34em;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--gray-500);
}

.page-about .principles-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin: 26px 0 0;
}

.page-about .principles-hint {
  font-size: 13px;
  color: var(--gray-500);
}

/* ---------- 术语与赛季 ---------- */
.page-about .terms-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .term-card {
  border: 1px solid var(--line-dark);
  border-left: 3px solid var(--grape-700);
  padding: 20px 18px;
  background: rgba(192, 155, 221, 0.05);
}

.page-about .term-card__tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 9px;
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--green-500);
  border: 1px solid rgba(139, 195, 74, 0.5);
}

.page-about .term-card__title {
  margin: 0 0 8px;
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper-050);
}

.page-about .term-card__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--about-muted);
}

.page-about .season-note {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 20px;
  padding: 22px 20px;
  border: 1px solid var(--line-dark);
  background: linear-gradient(120deg, rgba(107, 46, 138, 0.32), rgba(42, 14, 56, 0.2));
}

.page-about .season-note__num {
  font-size: clamp(30px, 5vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold-400);
}

.page-about .season-note__title {
  margin: 0 0 8px;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--paper-050);
}

.page-about .season-note__text {
  max-width: 34em;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(247, 244, 250, 0.84);
}

/* ---------- 改版成果 ---------- */
.page-about .about-grape {
  border: 1px solid rgba(192, 155, 221, 0.32);
  background:
    radial-gradient(110% 80% at 100% 0%, rgba(46, 107, 230, 0.24), transparent 62%),
    linear-gradient(150deg, rgba(107, 46, 138, 0.55), rgba(42, 14, 56, 0.9));
  padding: clamp(22px, 4vw, 44px);
}

.page-about .result-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: rgba(192, 155, 221, 0.2);
  border: 1px solid rgba(192, 155, 221, 0.2);
  margin-bottom: 22px;
}

.page-about .result-cell {
  background: rgba(10, 7, 16, 0.55);
  padding: 18px 16px;
}

.page-about .result-num {
  display: block;
  font-size: clamp(26px, 4.4vw, 36px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--gold-400);
}

.page-about .result-label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--about-muted);
}

.page-about .result-text {
  max-width: 34em;
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(247, 244, 250, 0.86);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(30px, 4vw, 52px);
  padding: clamp(24px, 4vw, 42px);
  border: 1px solid var(--line-dark);
  border-top: 3px solid var(--green-500);
  background: linear-gradient(160deg, rgba(107, 46, 138, 0.28), rgba(10, 7, 16, 0.6));
}

.page-about .about-cta__eyebrow {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--green-500);
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.28;
  font-weight: 900;
  color: var(--paper-050);
}

.page-about .about-cta__text {
  max-width: 34em;
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-muted);
}

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

.page-about .about-cta__actions .btn {
  min-height: 44px;
}

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

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

@media (min-width: 768px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.5fr);
    align-items: end;
  }

  .page-about .story-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
    align-items: start;
  }

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

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

  .page-about .season-note {
    grid-template-columns: 132px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .principle {
    grid-template-columns: 64px minmax(0, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .process-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    align-items: start;
  }

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

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    align-items: start;
    gap: clamp(32px, 4vw, 60px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 20px;
    margin-inline: 0;
    padding: 0;
    background: transparent;
    border-bottom: 0;
    border-left: 1px solid var(--line-dark);
  }

  .page-about .about-rail__label {
    display: block;
    padding-left: 14px;
  }

  .page-about .about-toc {
    display: block;
    overflow: visible;
  }

  .page-about .about-toc li {
    margin-bottom: 2px;
  }

  .page-about .about-toc__link {
    display: flex;
    width: 100%;
    padding: 10px 12px 10px 14px;
    background: transparent;
    border-bottom: 0;
    border-left: 2px solid transparent;
    margin-left: -1px;
  }

  .page-about .about-toc__link.is-active,
  .page-about .about-toc__link[aria-current="true"] {
    background: rgba(107, 46, 138, 0.35);
    border-left-color: var(--green-500);
    border-bottom-color: transparent;
  }
}

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