.page-about {
  --about-wrap: 1120px;
  --about-gutter: clamp(18px, 4vw, 40px);
  --about-line: rgba(59, 240, 176, 0.24);
  --about-paper-ink: #171310;
  background: var(--k-ink);
  color: var(--k-paper);
  padding-top: clamp(12px, 2vw, 24px);
  padding-bottom: clamp(40px, 7vw, 80px);
  overflow-x: clip;
}

.page-about .about-crumb,
.page-about .about-hero,
.page-about .about-timeline,
.page-about .about-versions,
.page-about .about-coverage,
.page-about .about-next {
  width: 100%;
  max-width: var(--about-wrap);
  margin-inline: auto;
  padding-inline: var(--about-gutter);
}

.page-about a:focus-visible,
.page-about summary:focus-visible,
.page-about [tabindex]:focus-visible {
  outline: 2px solid var(--k-mint);
  outline-offset: 3px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(16px, 3vw, 32px);
  padding-bottom: clamp(30px, 5vw, 54px);
  border-bottom: 2px solid var(--about-line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: var(--about-gutter);
  right: var(--about-gutter);
  bottom: -2px;
  height: 2px;
  background: linear-gradient(90deg, var(--k-mint), rgba(59, 240, 176, 0) 64%);
}

.page-about .about-hero__title {
  font-family: var(--k-font-display);
  font-size: clamp(30px, 6.4vw, 61px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--k-paper);
  margin: 12px 0 18px;
  max-width: 18ch;
}

.page-about .about-hero__lede {
  max-width: 54ch;
  margin: 0 0 clamp(24px, 4vw, 34px);
  font-size: clamp(15px, 2.1vw, 17px);
  line-height: 1.85;
  color: rgba(242, 234, 216, 0.82);
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: var(--about-line);
  border: 2px solid var(--about-line);
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  background: var(--k-ink-2);
}

.page-about .about-stats__val {
  font-family: var(--k-font-mono);
  font-size: clamp(21px, 4vw, 29px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--k-mint);
}

.page-about .about-stats__key {
  font-size: 13px;
  line-height: 1.5;
  color: var(--k-muted);
  letter-spacing: 0.02em;
}

/* ---------- 通用标题 ---------- */
.page-about .about-h2 {
  font-family: var(--k-font-display);
  font-size: clamp(23px, 4.4vw, 39px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--k-paper);
  margin: 0 0 14px;
  max-width: 22ch;
}

.page-about .about-h2--dark {
  color: var(--k-black);
}

.page-about .about-sub {
  max-width: 56ch;
  margin: 0 0 clamp(22px, 4vw, 38px);
  font-size: 16px;
  line-height: 1.8;
  color: var(--k-muted);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  padding-top: clamp(30px, 5vw, 54px);
}

.page-about .about-timeline__figure {
  position: relative;
  margin: 0 0 clamp(24px, 4vw, 40px);
  border: 2px solid var(--about-line);
  box-shadow: var(--k-shadow-3);
  overflow: hidden;
}

.page-about .about-timeline__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, rgba(11, 31, 26, 0.74), rgba(11, 31, 26, 0.04) 62%);
  pointer-events: none;
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(24px, 4vw, 36px) 78px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 30px;
  top: 10px;
  bottom: 0;
  width: 2px;
  background: var(--about-line);
}

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

.page-about .about-timeline__item:last-child::before {
  bottom: auto;
  height: 40px;
}

.page-about .about-timeline__no {
  position: absolute;
  left: 0;
  top: 0;
  width: 62px;
  padding: 2px 0;
  text-align: center;
  font-family: var(--k-font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--k-mint);
  background: var(--k-ink);
}

.page-about .about-timeline__body {
  max-width: 60ch;
}

.page-about .about-timeline__season {
  margin: 0 0 6px;
  font-family: var(--k-font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--k-blue);
}

.page-about .about-timeline__title {
  font-family: var(--k-font-display);
  font-size: clamp(18px, 2.8vw, 25px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--k-paper);
  margin: 0 0 8px;
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(242, 234, 216, 0.78);
}

.page-about .about-timeline__details {
  margin-top: 10px;
  padding-left: 12px;
  border-left: 2px solid rgba(255, 162, 58, 0.55);
}

.page-about .about-timeline__details summary {
  cursor: pointer;
  list-style: none;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--k-muted);
  transition: color 0.18s var(--k-ease);
}

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

.page-about .about-timeline__details summary::before {
  content: "+ ";
  font-family: var(--k-font-mono);
  color: var(--k-amber);
}

.page-about .about-timeline__details[open] summary::before {
  content: "\2212 ";
}

.page-about .about-timeline__details summary:hover {
  color: var(--k-mint);
}

.page-about .about-timeline__details p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(242, 234, 216, 0.68);
}

/* ---------- 奶油纸面阅读区 ---------- */
.page-about .about-paper {
  margin-top: clamp(30px, 5vw, 56px);
  padding-block: clamp(32px, 6vw, 60px);
  background-color: var(--k-paper);
  background-image: repeating-linear-gradient(
    to bottom,
    rgba(23, 19, 16, 0) 0 33px,
    rgba(23, 19, 16, 0.055) 33px 34px
  );
  color: var(--about-paper-ink);
  border-top: 3px solid var(--k-black);
  border-bottom: 3px solid var(--k-black);
}

.page-about .about-paper__inner {
  max-width: var(--about-wrap);
  margin-inline: auto;
  padding-inline: var(--about-gutter);
}

.page-about .about-paper__tag {
  display: inline-block;
  margin: 0 0 14px;
  padding: 3px 10px;
  border: 2px solid var(--k-black);
  font-family: var(--k-font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--k-mint-dark);
}

.page-about .about-p {
  max-width: 58ch;
  margin: 0 0 22px;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(23, 19, 16, 0.82);
}

.page-about .about-team {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  margin-bottom: clamp(28px, 5vw, 46px);
}

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--k-black);
}

.page-about .about-team__list li {
  display: grid;
  gap: 4px;
  padding: 13px 0;
  border-bottom: 1px solid rgba(23, 19, 16, 0.18);
}

.page-about .about-team__list strong {
  font-family: var(--k-font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--k-black);
}

.page-about .about-team__list span {
  font-size: 14px;
  line-height: 1.75;
  color: rgba(23, 19, 16, 0.72);
}

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

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 3px solid var(--k-black);
  box-shadow: var(--k-shadow-2);
  filter: saturate(0.72) contrast(1.06);
}

.page-about .about-team__figure .k-figure__cap {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(23, 19, 16, 0.6);
}

/* ---------- 四象限 ---------- */
.page-about .about-quad-wrap {
  padding: clamp(14px, 2.6vw, 24px);
  margin-bottom: clamp(28px, 5vw, 46px);
  background: var(--k-ink);
  border: 3px solid var(--k-black);
  box-shadow: var(--k-shadow-2);
}

.page-about .about-quad-wrap h3 {
  margin: 0 0 14px;
  font-family: var(--k-font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--k-paper);
}

.page-about .about-quad {
  display: block;
  width: 100%;
  max-width: 500px;
  height: auto;
  margin-inline: auto;
}

.page-about .about-quad__cell {
  outline: none;
}

.page-about .about-quad__cell rect {
  fill: var(--k-ink-2);
  stroke: rgba(59, 240, 176, 0.42);
  stroke-width: 2;
  transition: fill 0.18s var(--k-ease), stroke 0.18s var(--k-ease);
}

.page-about .about-quad__cell:hover rect,
.page-about .about-quad__cell:focus-visible rect {
  fill: var(--k-mint-dark);
  stroke: var(--k-mint);
}

.page-about .about-quad__cell:focus-visible rect {
  stroke-width: 3;
}

.page-about .about-quad__label {
  fill: var(--k-paper);
  font-family: var(--k-font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-about .about-quad__brief {
  fill: var(--k-amber);
  font-family: var(--k-font-mono);
  font-size: 11px;
  letter-spacing: 0.02em;
  opacity: 0.5;
  transition: opacity 0.18s var(--k-ease);
}

.page-about .about-quad__cell:hover .about-quad__brief,
.page-about .about-quad__cell:focus-visible .about-quad__brief {
  opacity: 1;
}

/* ---------- 场馆校验 ---------- */
.page-about .about-rule {
  height: 0;
  margin: clamp(26px, 5vw, 44px) 0;
  border: 0;
  border-top: 2px dashed rgba(23, 19, 16, 0.3);
}

.page-about .about-check {
  border-top: 2px solid var(--k-black);
}

.page-about .about-check__item {
  padding: 16px 0;
  border-bottom: 1px solid rgba(23, 19, 16, 0.18);
}

.page-about .about-check__no {
  display: block;
  margin-bottom: 4px;
  font-family: var(--k-font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--k-mint-dark);
}

.page-about .about-check__item h3 {
  margin: 0 0 6px;
  font-family: var(--k-font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--k-black);
}

.page-about .about-check__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(23, 19, 16, 0.76);
}

/* ---------- 版本演进 ---------- */
.page-about .about-versions {
  padding-top: clamp(36px, 6vw, 66px);
  padding-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-versions__head {
  margin-bottom: clamp(22px, 4vw, 38px);
}

.page-about .about-versions__body {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

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

.page-about .about-versions__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border: 2px solid var(--about-line);
  box-shadow: var(--k-shadow-2);
}

.page-about .about-ver {
  padding-left: clamp(14px, 2.4vw, 20px);
  border-left: 3px solid rgba(255, 162, 58, 0.72);
  margin-bottom: clamp(24px, 4vw, 32px);
}

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

.page-about .about-ver__tag {
  margin: 0 0 8px;
  font-family: var(--k-font-mono);
  font-size: 12px;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--k-amber);
}

.page-about .about-ver__title {
  margin: 0 0 12px;
  font-family: var(--k-font-display);
  font-size: clamp(19px, 2.9vw, 25px);
  font-weight: 700;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--k-paper);
}

.page-about .about-ver p {
  max-width: 56ch;
  margin: 0 0 12px;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(242, 234, 216, 0.78);
}

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

.page-about .about-link {
  color: var(--k-mint);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
  transition: color 0.18s var(--k-ease);
}

.page-about .about-link:hover {
  color: #8df6cd;
}

/* ---------- 覆盖与承接 ---------- */
.page-about .about-coverage {
  padding-top: clamp(32px, 6vw, 60px);
  padding-bottom: clamp(20px, 4vw, 36px);
}

.page-about .about-cov {
  display: grid;
  border-top: 2px solid var(--about-line);
}

.page-about .about-cov__cell {
  padding: 20px 0;
  border-bottom: 1px solid rgba(59, 240, 176, 0.16);
}

.page-about .about-cov__cell:last-child {
  border-bottom: 0;
}

.page-about .about-cov__no {
  margin: 0 0 8px;
  font-family: var(--k-font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--k-blue);
}

.page-about .about-cov__cell h3 {
  margin: 0 0 10px;
  font-family: var(--k-font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--k-paper);
}

.page-about .about-cov__cell p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(242, 234, 216, 0.76);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding-top: clamp(28px, 5vw, 50px);
}

.page-about .about-next__list {
  list-style: none;
  margin: 0 0 clamp(24px, 4vw, 38px);
  padding: 0;
  display: grid;
  border-top: 2px solid var(--about-line);
}

.page-about .about-next__list li {
  padding: 18px 0;
  border-bottom: 1px solid rgba(59, 240, 176, 0.16);
}

.page-about .about-next__list li:last-child {
  border-bottom: 0;
}

.page-about .about-next__list h3 {
  margin: 0 0 8px;
  font-family: var(--k-font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--k-mint);
}

.page-about .about-next__list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(242, 234, 216, 0.76);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-hero__title {
    max-width: 16ch;
  }
}

@media (min-width: 860px) {
  .page-about .about-team {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: start;
  }

  .page-about .about-versions__body {
    grid-template-columns: 0.7fr 1.3fr;
    align-items: start;
  }

  .page-about .about-check {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-bottom: 2px solid var(--k-black);
  }

  .page-about .about-check__item {
    padding: 18px clamp(14px, 2vw, 22px);
    border-bottom: 0;
    border-left: 1px solid rgba(23, 19, 16, 0.18);
  }

  .page-about .about-check__item:first-child {
    padding-left: 0;
    border-left: 0;
  }

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

  .page-about .about-cov__cell {
    padding: 22px clamp(14px, 2vw, 24px);
    border-bottom: 0;
    border-right: 1px solid rgba(59, 240, 176, 0.16);
  }

  .page-about .about-cov__cell:first-child {
    padding-left: 0;
  }

  .page-about .about-cov__cell:last-child {
    padding-right: 0;
    border-right: 0;
  }

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

  .page-about .about-next__list li {
    padding: 22px clamp(14px, 2vw, 24px);
    border-bottom: 0;
    border-right: 1px solid rgba(59, 240, 176, 0.16);
  }

  .page-about .about-next__list li:first-child {
    padding-left: 0;
  }

  .page-about .about-next__list li:last-child {
    padding-right: 0;
    border-right: 0;
  }
}

@media (min-width: 1080px) {
  .page-about .about-timeline__item {
    padding-left: 104px;
  }

  .page-about .about-timeline__item::before {
    left: 40px;
  }

  .page-about .about-timeline__no {
    width: 82px;
    font-size: 16px;
  }

  .page-about .about-hero__title {
    font-size: clamp(44px, 5.2vw, 61px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}
<<<END>>>