.page-about {
  background: var(--c-paper);
  color: var(--c-ink);
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(120% 90% at 82% 4%, var(--c-lime-soft), transparent 58%),
    linear-gradient(178deg, var(--c-night) 0%, var(--c-stand) 100%);
  color: var(--c-ice);
  padding: clamp(20px, 4vw, 34px) 0 clamp(38px, 6vw, 72px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    90deg,
    rgba(184, 255, 60, 0.05) 0 1px,
    transparent 1px 72px
  );
  -webkit-mask-image: linear-gradient(180deg, transparent 4%, #000 55%, transparent 96%);
  mask-image: linear-gradient(180deg, transparent 4%, #000 55%, transparent 96%);
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .crumbs {
  color: var(--c-mist);
  font-size: 12px;
  letter-spacing: 0.08em;
  margin-bottom: clamp(22px, 4vw, 44px);
}

.page-about .about-hero .crumbs__link {
  color: var(--c-mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-hero .crumbs__link:hover,
.page-about .about-hero .crumbs__link:focus-visible {
  color: var(--c-lime);
  border-bottom-color: var(--c-lime);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(18px, 3vw, 34px);
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-lime);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(34px, 7.4vw, 86px);
  line-height: 1.02;
  letter-spacing: -0.012em;
  text-wrap: balance;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(14px, 1.05vw, 16px);
  line-height: 1.85;
  color: var(--c-ice);
  opacity: 0.86;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-about .about-hero__actions--foot {
  margin-top: clamp(24px, 3vw, 34px);
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: end;
    gap: clamp(28px, 4vw, 60px);
  }
}

/* ---------- 数据条 ---------- */

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(26px, 4vw, 46px);
  background: rgba(184, 255, 60, 0.16);
  border: 1px solid rgba(184, 255, 60, 0.16);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-figures__item {
  background: var(--c-night);
  padding: 14px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .about-figures__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(19px, 2.5vw, 28px);
  color: var(--c-lime);
  letter-spacing: -0.01em;
}

.page-about .about-figures__label {
  font-size: 11.5px;
  line-height: 1.5;
  letter-spacing: 0.06em;
  color: var(--c-mist);
}

@media (min-width: 780px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 章节索引条 ---------- */

.page-about .about-map {
  background: var(--c-stand);
  border-top: 1px solid var(--c-rail);
  border-bottom: 1px solid var(--c-rail);
}

.page-about .about-map__track {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding: 12px 0;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-about .about-map__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--c-rail);
  border-radius: var(--radius);
  color: var(--c-mist);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .about-map__link b {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--c-lime);
  font-size: 11px;
}

.page-about .about-map__link:hover,
.page-about .about-map__link:focus-visible {
  color: var(--c-ice);
  border-color: var(--c-lime);
  background: var(--c-lime-soft);
}

/* ---------- 章节骨架 ---------- */

.page-about .chapter {
  padding: clamp(44px, 7vw, 96px) 0;
  scroll-margin-top: 78px;
}

.page-about .chapter--paper {
  background: var(--c-paper);
  color: var(--c-ink);
}

.page-about .chapter--night {
  background: var(--c-night);
  color: var(--c-ice);
}

.page-about .chapter--stand {
  background: var(--c-stand);
  color: var(--c-ice);
}

.page-about .chapter__inner {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

@media (min-width: 920px) {
  .page-about .chapter__inner {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.35fr);
    gap: clamp(28px, 4.5vw, 72px);
  }
}

.page-about .chapter__lead {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .chapter__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(52px, 9.5vw, 116px);
  line-height: 0.8;
  letter-spacing: -0.03em;
}

.page-about .chapter--paper .chapter__num {
  color: var(--c-whistle);
  opacity: 0.5;
}

.page-about .chapter--night .chapter__num,
.page-about .chapter--stand .chapter__num {
  color: var(--c-lime);
  opacity: 0.62;
}

.page-about .chapter__title {
  margin: 0;
  padding-top: 12px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.34;
  letter-spacing: 0.005em;
  text-wrap: balance;
}

.page-about .chapter--paper .chapter__title {
  border-top: 1px solid var(--c-paperline);
}

.page-about .chapter--night .chapter__title,
.page-about .chapter--stand .chapter__title {
  border-top: 1px solid var(--c-rail);
}

.page-about .chapter__body p {
  margin: 0 0 1em;
  max-width: 64ch;
  font-size: clamp(14px, 1.02vw, 15.5px);
  line-height: 1.88;
}

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

.page-about .chapter__note {
  margin-top: clamp(18px, 2.6vw, 26px) !important;
  font-size: 13.5px !important;
  line-height: 1.8 !important;
  opacity: 0.82;
}

.page-about .inline-link {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid var(--c-lime);
  padding-bottom: 1px;
  transition: color 0.25s var(--ease);
}

.page-about .chapter--paper .inline-link {
  border-bottom-color: var(--c-whistle);
}

.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  color: var(--c-lime);
}

.page-about .chapter--paper .inline-link:hover,
.page-about .chapter--paper .inline-link:focus-visible {
  color: var(--c-whistle);
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--c-paperline);
  border-radius: var(--radius);
  background: var(--c-paper-soft);
}

.page-about .chapter--night .about-figure,
.page-about .chapter--stand .about-figure {
  border-color: var(--c-rail);
  background: var(--c-stand);
}

.page-about .chapter__body > .about-figure {
  margin-top: clamp(22px, 3vw, 36px);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.92);
  transition: transform 0.6s var(--ease), filter 0.4s var(--ease);
}

.page-about .about-figure:hover img {
  transform: scale(1.02);
  filter: saturate(1);
}

.page-about .about-figure__tag {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 6px 12px;
  background: var(--c-night);
  color: var(--c-lime);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
}

/* ---------- 图例式角色表 ---------- */

.page-about .legend {
  margin-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid var(--c-rail);
}

.page-about .legend__row {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto;
  grid-template-areas:
    "dot name count"
    ". text text";
  gap: 6px 12px;
  align-items: center;
  padding: 16px 0;
  border-bottom: 1px solid var(--c-rail);
  transition: background 0.3s var(--ease);
}

.page-about .legend__row:hover,
.page-about .legend__row:focus-within {
  background: rgba(184, 255, 60, 0.045);
}

.page-about .legend__dot {
  grid-area: dot;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-lime);
  box-shadow: 0 0 10px rgba(184, 255, 60, 0.5);
}

.page-about .legend__row:nth-child(2) .legend__dot {
  background: var(--c-whistle);
  box-shadow: 0 0 10px rgba(255, 106, 42, 0.45);
}

.page-about .legend__row:nth-child(3) .legend__dot {
  background: var(--c-ice);
  box-shadow: none;
}

.page-about .legend__row:nth-child(4) .legend__dot {
  background: var(--c-mist);
  box-shadow: none;
}

.page-about .legend__name {
  grid-area: name;
  font-family: var(--font-display);
  font-size: 17px;
  letter-spacing: 0.08em;
  color: var(--c-ice);
}

.page-about .legend__count {
  grid-area: count;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--c-lime);
}

.page-about .legend__text {
  grid-area: text;
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--c-mist);
}

.page-about .legend__footnote {
  margin-top: clamp(16px, 2.4vw, 24px) !important;
  font-size: 13.5px !important;
  line-height: 1.8 !important;
  color: var(--c-mist);
  max-width: 62ch;
}

@media (min-width: 840px) {
  .page-about .legend__row {
    grid-template-columns: 12px minmax(0, 132px) 76px minmax(0, 1fr);
    grid-template-areas: "dot name count text";
    gap: 18px;
    padding: 15px 0;
  }
}

/* ---------- 工作流 ---------- */

.page-about .flow {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
}

.page-about .flow__step {
  position: relative;
  padding: 0 0 clamp(20px, 3vw, 28px) 34px;
  border-left: 1px solid var(--c-paperline);
}

.page-about .flow__step:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .flow__step::before {
  content: attr(data-step);
  position: absolute;
  left: -11px;
  top: -2px;
  width: 21px;
  height: 21px;
  display: grid;
  place-items: center;
  background: var(--c-paper);
  border: 1px solid var(--c-ink);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1;
  color: var(--c-ink);
}

.page-about .flow__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  letter-spacing: 0.05em;
}

.page-about .flow__text {
  margin: 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.82;
  opacity: 0.8;
}

/* ---------- 场馆四步 ---------- */

.page-about .venue-steps {
  display: grid;
  gap: 1px;
  margin-top: clamp(22px, 3vw, 32px);
  background: var(--c-rail);
  border: 1px solid var(--c-rail);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .venue-step {
  background: var(--c-night);
  padding: clamp(16px, 2.4vw, 24px);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .venue-step__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--c-whistle);
}

.page-about .venue-step__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  letter-spacing: 0.05em;
  color: var(--c-ice);
}

.page-about .venue-step__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--c-mist);
}

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

@media (min-width: 1080px) {
  .page-about .venue-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 里程碑 ---------- */

.page-about .milestones {
  margin-top: clamp(20px, 3vw, 30px);
  border-top: 1px solid var(--c-paperline);
}

.page-about .milestone {
  border-bottom: 1px solid var(--c-paperline);
}

.page-about .milestone summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .milestone summary:focus-visible {
  outline: 2px solid var(--c-whistle);
  outline-offset: 3px;
}

.page-about .milestone__year {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-whistle);
}

.page-about .milestone__title {
  flex: 1 1 auto;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(15.5px, 1.9vw, 19px);
  line-height: 1.5;
}

.page-about .milestone__mark {
  position: relative;
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  border: 1px solid currentColor;
  border-radius: 50%;
  opacity: 0.45;
  transition: opacity 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .milestone__mark::before,
.page-about .milestone__mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: currentColor;
  transform: translate(-50%, -50%);
}

.page-about .milestone__mark::before {
  width: 8px;
  height: 1px;
}

.page-about .milestone__mark::after {
  width: 1px;
  height: 8px;
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}

.page-about .milestone[open] .milestone__mark {
  opacity: 0.9;
  border-color: var(--c-whistle);
  color: var(--c-whistle);
}

.page-about .milestone[open] .milestone__mark::after {
  transform: translate(-50%, -50%) scaleY(0);
  opacity: 0;
}

.page-about .milestone__body {
  padding: 0 0 18px 0;
}

.page-about .milestone__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.85;
  opacity: 0.8;
}

/* ---------- 联系方式 ---------- */

.page-about .reach {
  margin: clamp(20px, 3vw, 30px) 0 0;
  border-top: 1px solid var(--c-rail);
}

.page-about .reach__row {
  display: grid;
  gap: 4px;
  padding: 15px 0;
  border-bottom: 1px solid var(--c-rail);
}

.page-about .reach__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-mist);
}

.page-about .reach__val {
  margin: 0;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.6;
  color: var(--c-ice);
  word-break: break-word;
}

.page-about .reach__note {
  margin-top: clamp(16px, 2.4vw, 22px) !important;
  max-width: 62ch;
  font-size: 13.5px !important;
  line-height: 1.82 !important;
  color: var(--c-mist);
}

@media (min-width: 760px) {
  .page-about .reach__row {
    grid-template-columns: 132px minmax(0, 1fr);
    align-items: baseline;
    gap: 18px;
  }
}

/* ---------- 动效偏好 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-figure img,
  .page-about .about-map__link,
  .page-about .legend__row,
  .page-about .milestone__mark,
  .page-about .milestone__mark::after {
    transition: none;
  }

  .page-about .about-figure:hover img {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>