.page-about {
  --about-pad: clamp(40px, 7vw, 88px);
  --about-gap: clamp(24px, 4vw, 48px);
  display: block;
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: clamp(16px, 3vw, 28px) 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-mute);
}

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

.page-about .breadcrumb a:hover {
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-bottom: var(--about-pad);
  border-bottom: var(--rule);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -90px;
  right: -12%;
  width: min(780px, 74vw);
  height: 470px;
  background: linear-gradient(135deg, rgba(53, 240, 216, 0.18), rgba(53, 240, 216, 0) 64%);
  clip-path: polygon(24% 0, 100% 0, 100% 74%, 0 100%);
  pointer-events: none;
  z-index: 0;
}

.page-about .hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  padding-top: clamp(12px, 2.4vw, 24px);
}

.page-about .hero-copy h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 5.6vw, 58px);
  line-height: 1.14;
  letter-spacing: 0.01em;
}

.page-about .hero-copy .lede {
  max-width: 44ch;
  margin-top: 18px;
}

.page-about .hero-meta {
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 20px 0 0;
  border-top: var(--rule);
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .hero-meta li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink-dim);
}

.page-about .hero-num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
  color: var(--c-cyan);
}

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

.page-about .hero-media img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border: var(--rule);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-block {
  padding: var(--about-pad) 0;
  border-bottom: var(--rule);
}

.page-about .block-head {
  max-width: 62ch;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .block-head .section-title {
  margin: 10px 0 0;
}

.page-about .block-head .lede {
  margin-top: 16px;
}

.page-about .split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.5vw, 44px);
}

.page-about .split-main p {
  font-size: 17px;
  line-height: 1.85;
}

.page-about .split-side {
  display: flex;
  flex-direction: column;
  gap: 18px;
  align-self: start;
}

/* ---------- 边注 ---------- */
.page-about .side-card {
  border: var(--rule);
  border-left: 2px solid var(--c-cyan);
  background: var(--c-steel);
  padding: 18px 20px;
}

.page-about .side-title {
  margin: 0 0 12px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-about .side-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  font-size: 15px;
  line-height: 1.65;
  color: var(--ink-dim);
}

.page-about .side-list li {
  position: relative;
  padding-left: 14px;
}

.page-about .side-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 1px;
  background: var(--c-cyan);
}

.page-about .contact-lines li {
  padding-left: 0;
}

.page-about .contact-lines li::before {
  display: none;
}

.page-about .contact-lines .mono {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--c-ink);
  word-break: break-word;
}

.page-about .cadence {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .cadence li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--ink-dim);
}

.page-about .cadence .mono {
  flex: 0 0 auto;
  min-width: 56px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-cyan);
}

/* ---------- 折叠术语与勘误 ---------- */
.page-about .term {
  border-top: var(--rule);
  padding: 12px 0 0;
}

.page-about .term summary,
.page-about .errata-detail summary {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-cyan);
  list-style: none;
}

.page-about .term summary::-webkit-details-marker,
.page-about .errata-detail summary::-webkit-details-marker {
  display: none;
}

.page-about .term summary::before,
.page-about .errata-detail summary::before {
  content: "+";
  font-size: 14px;
  line-height: 1;
  color: var(--c-cyan);
}

.page-about .term[open] summary::before,
.page-about .errata-detail[open] summary::before {
  content: "–";
}

.page-about .term summary:focus-visible,
.page-about .errata-detail summary:focus-visible {
  outline: 1px solid var(--c-cyan);
  outline-offset: 3px;
}

.page-about .term > p {
  margin: 10px 0 0;
  font-size: 14px;
  font-weight: 300;
  line-height: 1.75;
  color: var(--ink-mute);
}

.page-about .errata-detail {
  margin-top: 24px;
  border: var(--rule);
  background: var(--c-trench);
  padding: 16px 18px;
}

.page-about .errata-detail div {
  padding-top: 12px;
}

.page-about .errata-detail p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-dim);
}

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

/* ---------- 三层信息层级 ---------- */
.page-about .layer-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .layer-list li {
  border-left: 2px solid var(--c-grid);
  padding: 2px 0 2px 18px;
}

.page-about .layer-list li:first-child {
  border-left-color: var(--c-cyan);
}

.page-about .layer-list h3 {
  margin: 0 0 8px;
  font-family: var(--font-body);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--c-ink);
}

.page-about .layer-list p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-dim);
}

.page-about .layer-figure,
.page-about .scale-figure {
  margin: clamp(28px, 4vw, 44px) 0 0;
}

.page-about .layer-figure img,
.page-about .scale-figure img {
  width: 100%;
  aspect-ratio: 5 / 3;
  object-fit: cover;
  border: var(--rule);
}

.page-about .scale-figure img {
  aspect-ratio: 3 / 2;
}

/* ---------- 赛季年表 ---------- */
.page-about .season-scale {
  margin-top: clamp(24px, 4vw, 40px);
  display: grid;
  grid-template-columns: 1fr;
  border-top: var(--rule);
}

.page-about .scale-item {
  padding: 20px 0;
  border-bottom: var(--rule);
}

.page-about .scale-item::before {
  content: "";
  display: block;
  width: 26px;
  height: 2px;
  margin-bottom: 14px;
  background: var(--c-cyan);
}

.page-about .scale-item--now::before {
  background: var(--c-coral);
  width: 40px;
}

.page-about .scale-tag {
  display: inline-block;
  padding: 3px 8px;
  border: 1px solid var(--c-grid);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-cyan);
}

.page-about .scale-item--now .scale-tag {
  border-color: var(--c-coral);
  color: var(--c-coral);
}

.page-about .scale-item h3 {
  margin: 14px 0 8px;
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 600;
  color: var(--c-ink);
}

.page-about .scale-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-mute);
}

/* ---------- 纸白规范分区 ---------- */
.page-about .paper-block {
  background: var(--c-paper);
  border: var(--rule);
  padding: clamp(24px, 4.5vw, 52px);
}

.page-about .paper-block .block-head {
  max-width: 68ch;
  margin-bottom: clamp(18px, 3vw, 32px);
}

.page-about .paper-block .eyebrow {
  color: #0B6F62;
}

.page-about .paper-block .section-title {
  color: var(--ink-dark);
  margin: 10px 0 0;
}

.page-about .paper-block .lede {
  margin-top: 14px;
  color: #22384A;
}

.page-about .spec-list {
  margin: 0;
  display: grid;
}

.page-about .spec-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 18px 0;
  border-top: 1px solid #D3DCE1;
}

.page-about .spec-row dt {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: #0B6F62;
}

.page-about .spec-row dd {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: #24384A;
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  margin-top: clamp(26px, 4vw, 44px);
  padding-top: clamp(20px, 3vw, 30px);
  border-top: var(--rule);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 16px;
}

.page-about .about-cta p {
  flex: 1 1 100%;
  margin: 0 0 4px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-mute);
}

/* ---------- 锚点导轨 ---------- */
.page-about .anchor-rail {
  position: fixed;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  display: none;
  flex-direction: column;
  gap: 10px;
  z-index: 20;
}

.page-about .anchor-rail a {
  padding: 3px 10px 3px 0;
  border-right: 1px solid var(--c-grid);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-align: right;
  text-decoration: none;
  color: var(--ink-mute);
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .anchor-rail a:hover {
  color: var(--c-ink);
}

.page-about .anchor-rail a[aria-current="true"] {
  color: var(--c-cyan);
  border-right-color: var(--c-cyan);
}

/* ---------- 浮现动效 ---------- */
.page-about [data-reveal] {
  transition: opacity 320ms var(--ease), transform 320ms var(--ease);
}

.page-about [data-reveal][data-reveal-init="true"] {
  opacity: 0;
  transform: translateY(20px);
}

.page-about [data-reveal][data-reveal-init="true"][data-visible="true"] {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .hero-meta {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .spec-row {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
  }
}

@media (min-width: 760px) {
  .page-about .season-scale {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    border-bottom: var(--rule);
  }

  .page-about .scale-item {
    padding: 22px 16px;
    border-bottom: 0;
    border-right: var(--rule);
  }

  .page-about .scale-item:last-child {
    border-right: 0;
  }
}

@media (min-width: 960px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
  }

  .page-about .hero-media img {
    aspect-ratio: 3 / 4;
  }
}

@media (min-width: 980px) {
  .page-about .split {
    grid-template-columns: minmax(0, 1.58fr) minmax(0, 1fr);
  }
}

@media (min-width: 1400px) {
  .page-about .anchor-rail {
    display: flex;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about .anchor-rail a {
    transition: none;
  }

  .page-about [data-reveal][data-reveal-init="true"] {
    transform: none;
  }
}
<<<END>>>