.page-about {
  --about-line: 2px;
  --about-card-pad: 1.25rem;
  padding-bottom: 5rem;
  color: var(--c-text);
  font-family: var(--font-body);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding: 1.25rem 0 0;
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  display: grid;
  gap: 1.5rem;
  padding: 2.25rem 0 3rem;
  border-bottom: 1px solid var(--c-rule);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 92px;
  height: 2px;
  background: var(--c-lime);
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 18ch;
  font-family: var(--font-display);
  font-size: clamp(2.125rem, 8.5vw, 4.5rem);
  font-weight: 700;
  line-height: 1.04;
  letter-spacing: 0.02em;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 44ch;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--c-muted);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1.25rem;
  margin-top: 0.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--c-rule);
}

.page-about .about-fact {
  display: grid;
  gap: 0.4rem;
}

.page-about .about-fact .num {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--c-lime);
}

.page-about .about-fact__label {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--c-muted);
}

/* ---------- 主布局 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 2.25rem;
  padding-top: 2.5rem;
}

.page-about .about-toc {
  border-left: var(--about-line) solid var(--c-rule);
  padding-left: 1rem;
}

.page-about .about-toc .toc__title {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-muted);
}

.page-about .about-toc .toc__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-toc .toc__link {
  padding-bottom: 2px;
  font-size: 0.8125rem;
  letter-spacing: 0.03em;
  color: var(--c-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-toc .toc__link:hover {
  color: var(--c-text);
}

.page-about .about-toc .toc__link[aria-current="location"] {
  color: var(--c-lime);
  border-bottom-color: var(--c-lime);
}

.page-about .about-body > * + * {
  margin-top: 2.5rem;
}

/* ---------- 章节标题 ---------- */
.page-about .section-head {
  margin-bottom: 1.5rem;
}

.page-about .section-title {
  margin: 0.5rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4.6vw, 2.25rem);
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: 0.02em;
}

.page-about .about-panel {
  padding: 2rem 1.25rem 2.25rem;
  border-radius: var(--radius-panel);
  border: 1px solid var(--c-rule);
}

.page-about .about-lead {
  max-width: 46ch;
  margin: 0 0 1.75rem;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--c-muted);
}

/* ---------- 正文 ---------- */
.page-about .prose p {
  max-width: 40ch;
  margin: 0 0 1rem;
  font-size: 0.9375rem;
  line-height: 1.85;
}

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

.page-about .prose a {
  color: var(--c-lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 242, 77, 0.45);
}

.page-about .prose a:hover {
  border-bottom-color: var(--c-lime);
}

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: 1.75rem;
}

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

.page-about .figure__media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--c-rule);
  border-radius: var(--radius-soft);
  background: var(--c-ink-deep);
}

.page-about .figure__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: grayscale(0.6) contrast(1.06) brightness(0.84);
}

.page-about .figure__media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(155deg, rgba(14, 42, 43, 0.5), rgba(30, 24, 54, 0.42));
}

.page-about .figure figcaption {
  margin-top: 0.625rem;
  font-size: 0.75rem;
  line-height: 1.6;
  letter-spacing: 0.05em;
  color: var(--c-muted);
}

/* ---------- 纵向时间轴 ---------- */
.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0.25rem 0 0 1.75rem;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.35rem;
  bottom: 0.5rem;
  width: var(--about-line);
  background: linear-gradient(180deg, var(--c-lime) 0%, var(--c-rule) 40%, var(--c-rule) 100%);
}

.page-about .timeline__item {
  position: relative;
  margin-bottom: 2.75rem;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1.75rem - 4px);
  top: 0.7rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--c-ink);
  border: var(--about-line) solid var(--c-lime);
}

.page-about .timeline__card {
  padding: var(--about-card-pad) var(--about-card-pad) calc(var(--about-card-pad) + 0.25rem);
  border: 1px solid var(--c-rule);
  border-radius: var(--radius-soft);
}

.page-about .timeline__item:nth-child(odd) .timeline__card {
  background: rgba(14, 42, 43, 0.5);
}

.page-about .timeline__item:nth-child(even) .timeline__card {
  background: rgba(30, 24, 54, 0.45);
}

.page-about .timeline__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 7vw, 3.25rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--c-lime);
}

.page-about .timeline__title {
  margin: 0.625rem 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  letter-spacing: 0.05em;
  color: var(--c-text);
}

.page-about .timeline__text {
  margin: 0;
  max-width: 44ch;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--c-muted);
}

.page-about .about-aisle {
  margin-top: 2.5rem;
}

/* ---------- 两条主线 ---------- */
.page-about .lines {
  display: grid;
  gap: 1.25rem;
}

.page-about .line-card {
  padding: 1.5rem 1.25rem;
  border: 1px solid var(--c-rule);
  border-radius: var(--radius-soft);
  background: rgba(10, 14, 12, 0.4);
}

.page-about .line-card__mark {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.24em;
  color: var(--c-orange);
}

.page-about .line-card__title {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  letter-spacing: 0.05em;
}

.page-about .line-card__intro {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--c-text);
}

.page-about .line-card__list {
  display: grid;
  gap: 0.5rem;
  margin: 1.125rem 0 0;
  padding-left: 1.1rem;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--c-muted);
}

.page-about .line-card__list li::marker {
  color: var(--c-lime);
}

/* ---------- 协作来源 ---------- */
.page-about .eco {
  display: grid;
  gap: 1.75rem;
}

.page-about .eco__item {
  padding-top: 1.25rem;
  border-top: var(--about-line) solid var(--c-rule);
}

.page-about .eco__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.75rem, 10vw, 4rem);
  line-height: 0.95;
  letter-spacing: 0.02em;
  color: var(--c-orange);
}

.page-about .eco__title {
  margin: 0.625rem 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  letter-spacing: 0.06em;
}

.page-about .eco__text {
  margin: 0;
  max-width: 40ch;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--c-muted);
}

/* ---------- 本赛季计划 ---------- */
.page-about .plan-copy {
  margin-bottom: 1.75rem;
}

.page-about .series {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .series li {
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--c-rule);
  border-radius: 999px;
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
  color: var(--c-text);
  background: rgba(17, 32, 26, 0.6);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 1.5rem;
  padding: 2rem 1.25rem;
  border: 1px solid var(--c-rule);
  border-radius: var(--radius-panel);
  background: linear-gradient(140deg, var(--c-zone-deep) 0%, var(--c-zone-indigo) 100%);
}

.page-about .about-cta__title {
  margin: 0 0 0.625rem;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 4vw, 1.75rem);
  line-height: 1.25;
  letter-spacing: 0.03em;
}

.page-about .about-cta__note {
  margin: 0;
  max-width: 44ch;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--c-muted);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 768px) {
  .page-about {
    padding-bottom: 6rem;
  }

  .page-about .about-hero {
    padding: 3.25rem 0 3.75rem;
  }

  .page-about .about-panel {
    padding: 2.5rem 2.25rem 3rem;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 2.25rem;
    align-items: start;
  }

  .page-about .about-split--flip > .about-split__text {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-split--flip > .about-split__media {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .lines {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.75rem;
  }

  .page-about .eco {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2.5rem;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 2rem;
    padding: 2.5rem 2.75rem;
  }
}

/* ---------- 桌面：侧栏目录 + 时间轴走廊 ---------- */
@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 200px) minmax(0, 1fr);
    gap: 3.5rem;
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 6.5rem;
    border-left: none;
    border-top: var(--about-line) solid var(--c-rule);
    padding: 1rem 0 0;
  }

  .page-about .about-toc .toc__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0.55rem;
  }

  .page-about .timeline {
    padding-left: 3.25rem;
  }

  .page-about .timeline__item {
    max-width: 82%;
  }

  .page-about .timeline__item:nth-child(2) {
    max-width: 78%;
    margin-bottom: 2.35rem;
  }

  .page-about .timeline__item:nth-child(3) {
    max-width: 74%;
    margin-bottom: 1.95rem;
  }

  .page-about .timeline__item:nth-child(4) {
    max-width: 70%;
    margin-bottom: 1.6rem;
  }

  .page-about .timeline__item:nth-child(5) {
    max-width: 66%;
    margin-bottom: 0;
  }

  .page-about .timeline__item::before {
    left: calc(-3.25rem - 4px);
  }

  .page-about .about-aisle {
    max-width: 62%;
    margin-left: auto;
  }
}
<<<END>>>