.page-about {
  --about-rail-w: 208px;
  --about-sec-pad: 36px;
  background: var(--paper);
  color: var(--graphite);
  font-family: var(--font-struct);
  padding-bottom: 72px;
  overflow-x: clip;
}

.page-about .about-hero {
  padding: 8px 0 30px;
  border-bottom: 2px solid var(--ink);
}

.page-about h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 6.4vw, 46px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 18px 0 0;
  max-width: 20ch;
  text-wrap: balance;
}

.page-about .about-lead {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--graphite);
}

.page-about .about-figures {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 32px;
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
}

.page-about .about-figure {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .about-figure b {
  font-family: var(--font-data);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--ink);
}

.page-about .about-figure span {
  font-family: var(--font-struct);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--rule);
}

.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding-top: 30px;
}

/* 左侧窄轨 */
.page-about .about-rail {
  min-width: 0;
  display: grid;
  gap: 24px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-rail .eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-struct);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--rule);
}

.page-about .toc ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
  border-left: 2px solid var(--rule);
}

.page-about .toc a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-left: -2px;
  padding: 7px 0 7px 12px;
  border-left: 2px solid transparent;
  font-size: 13px;
  line-height: 1.4;
  color: var(--graphite);
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .toc a .toc-idx {
  font-family: var(--font-data);
  font-size: 11px;
  color: var(--rule);
  transition: color 0.2s var(--ease);
}

.page-about .toc a:hover,
.page-about .toc a.is-active {
  color: var(--ink);
  border-left-color: var(--teal);
  background: color-mix(in srgb, var(--teal) 8%, transparent);
}

.page-about .toc a:hover .toc-idx,
.page-about .toc a.is-active .toc-idx {
  color: var(--teal);
}

.page-about .about-scale {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-scale li {
  position: relative;
  padding-left: 22px;
}

.page-about .about-scale li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 2px solid var(--teal);
  background: var(--paper);
}

.page-about .about-scale li::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 16px;
  bottom: -14px;
  width: 1px;
  background: var(--rule);
}

.page-about .about-scale li:last-child::after {
  display: none;
}

.page-about .about-scale a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--graphite);
  text-decoration: none;
}

.page-about .about-scale a span {
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-scale a:hover {
  color: var(--teal);
}

/* 右侧正文 */
.page-about .about-body {
  min-width: 0;
}

.page-about .about-sec {
  padding: var(--about-sec-pad) 0;
  border-top: 1px solid var(--rule);
}

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

.page-about .sec-head {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.page-about .sec-figure {
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.02em;
  color: var(--rule);
}

.page-about .about-sec h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(21px, 3.6vw, 30px);
  line-height: 1.24;
  letter-spacing: -0.015em;
  color: var(--ink);
  margin: 14px 0 0;
  max-width: 24ch;
}

.page-about .sec-lead {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--graphite);
}

.page-about .prose {
  margin-top: 16px;
  font-size: 16px;
  line-height: 1.8;
  max-width: 62ch;
}

.page-about .prose p {
  margin: 0 0 14px;
}

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

.page-about .prose a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid var(--teal);
  padding-bottom: 1px;
  transition: background-color 0.2s var(--ease);
}

.page-about .prose a:hover {
  background: color-mix(in srgb, var(--teal) 18%, transparent);
}

/* 图文错位 */
.page-about .sec-split {
  display: grid;
  gap: 20px;
  margin-top: 18px;
  align-items: start;
}

.page-about .sec-split .prose {
  margin-top: 0;
  max-width: none;
}

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

.page-about .media-frame {
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-soft);
  background: var(--paper-2);
  overflow: hidden;
}

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

.page-about .media-frame__caption {
  display: block;
  padding: 8px 12px;
  border-top: 1px solid var(--rule);
  background: var(--paper-2);
  font-family: var(--font-struct);
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--rule);
}

/* 赛段筛选与条目 */
.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
}

.page-about .season-cases {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 18px;
}

.page-about .season-case {
  position: relative;
  min-width: 0;
  padding: 18px 18px 20px;
  background: var(--paper-2);
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-soft);
}

.page-about .season-case::before {
  content: "";
  display: block;
  height: 6px;
  margin: -18px -18px 14px;
  background: var(--rule);
}

.page-about .season-case.is-spring::before { background: var(--spring); }
.page-about .season-case.is-summer::before { background: var(--summer); }
.page-about .season-case.is-autumn::before { background: var(--autumn); }
.page-about .season-case.is-winter::before { background: var(--winter); }

.page-about .season-case h3 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
  margin: 10px 0 8px;
}

.page-about .season-case p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--graphite);
}

/* 版本时间轴 */
.page-about .vlog {
  position: relative;
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .vlog::before {
  content: "";
  position: absolute;
  left: 22px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: var(--rule);
}

.page-about .vlog-item {
  position: relative;
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 16px;
  padding-bottom: 26px;
}

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

.page-about .vlog-node {
  position: relative;
  z-index: 1;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 2px solid var(--ink);
  background: var(--paper);
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .vlog-item.is-current .vlog-node {
  background: var(--teal);
  box-shadow: var(--shadow-soft);
}

.page-about .vlog-body {
  min-width: 0;
  padding-top: 2px;
}

.page-about .vlog-body h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
  margin: 8px 0 6px;
}

.page-about .vlog-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--graphite);
}

.page-about .vlog-body a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid var(--teal);
}

.page-about .vlog-body a:hover {
  background: color-mix(in srgb, var(--teal) 18%, transparent);
}

/* 引用块 */
.page-about .about-quote {
  margin: 24px 0 0;
  padding: 16px 18px;
  background: var(--paper-2);
  border: 2px solid var(--ink);
  border-left: 8px solid var(--teal);
  box-shadow: var(--shadow-soft);
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ink);
}

/* 通栏图与按钮 */
.page-about .about-wide-frame {
  margin: 24px 0 0;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 2px solid var(--ink);
}

.page-about .about-actions .btn {
  font-family: var(--font-struct);
}

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

@media (min-width: 900px) {
  .page-about .about-grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 52px;
    padding-top: 36px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 28px;
    align-self: start;
    max-height: calc(100vh - 56px);
    overflow-y: auto;
    padding-bottom: 0;
    border-bottom: 0;
  }

  .page-about .about-sec {
    --about-sec-pad: 44px;
  }

  .page-about .sec-split {
    gap: 30px;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .sec-split--reverse {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  }

  .page-about .about-figures {
    gap: 18px 44px;
  }

  .page-about .about-figure b {
    font-size: 30px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .toc a,
  .page-about .prose a {
    transition: none;
  }
}
<<<END>>>