.page-about {
  --about-line: rgba(199, 210, 222, 0.16);
  --about-line-strong: rgba(199, 210, 222, 0.34);
  --about-soft: rgba(243, 247, 251, 0.7);
  background: var(--ink);
  color: var(--ice);
  font-family: var(--font-sans);
  overflow-x: clip;
  -webkit-font-smoothing: antialiased;
}

.page-about .container {
  width: 100%;
  max-width: var(--page-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(6.5rem, 12vw, 9.5rem) clamp(3rem, 6vw, 5rem);
  background:
    radial-gradient(110% 70% at 86% 2%, rgba(255, 107, 26, 0.18), transparent 62%),
    linear-gradient(175deg, var(--ink-2) 0%, var(--ink) 58%);
  border-bottom: 2px solid var(--about-line-strong);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(42%, 400px);
  height: 5px;
  background: linear-gradient(90deg, transparent, var(--orange));
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb {
  grid-column: 1 / -1;
  margin: 0;
}

.page-about .about-hero__text {
  max-width: 44rem;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--orange);
  margin: 0 0 1.1rem;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.3rem, 7.2vw, 4.8rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 1.35rem;
}

.page-about .about-hero__title-accent {
  display: inline-block;
  color: var(--orange);
  transform: skewX(-5deg);
  transform-origin: left bottom;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 36rem;
  font-size: clamp(0.98rem, 1.5vw, 1.1rem);
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  background: var(--about-line-strong);
  border: 1px solid var(--about-line-strong);
}

.page-about .about-stat {
  background: var(--ink-2);
  padding: 0.95rem 0.8rem 1.05rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 3vw, 1.85rem);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-stat__label {
  font-size: 0.72rem;
  letter-spacing: 0.07em;
  color: var(--fog);
}

.page-about .about-hero__figure {
  margin: 0;
  border: 2px solid var(--about-line-strong);
  background: var(--ink-3);
  box-shadow: 8px 8px 0 0 rgba(255, 107, 26, 0.85), var(--shadow-brut);
  transform: skewX(-1.4deg);
}

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

.page-about .about-hero__caption {
  display: block;
  padding: 0.6rem 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: var(--fog);
  background: var(--ink);
  border-top: 2px solid var(--about-line-strong);
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 6.5fr) minmax(0, 5.5fr);
    align-items: end;
    column-gap: clamp(2rem, 5vw, 4rem);
  }
  .page-about .about-hero__text {
    grid-column: 1;
  }
  .page-about .about-hero__figure {
    grid-column: 2;
    align-self: end;
    box-shadow: 12px 12px 0 0 rgba(255, 107, 26, 0.85), var(--shadow-brut);
  }
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  position: relative;
  padding-block: clamp(3rem, 7vw, 5.75rem);
  border-bottom: 1px solid var(--about-line);
}

.page-about .chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  row-gap: clamp(1rem, 3vw, 1.6rem);
}

.page-about .chapter__aside {
  align-self: start;
}

.page-about .chapter__index {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.6rem, 8vw, 5.2rem);
  font-weight: 700;
  line-height: 0.82;
  letter-spacing: -0.05em;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--fog);
}

@supports not ((-webkit-text-stroke: 1px #000)) {
  .page-about .chapter__index {
    color: var(--ink-3);
  }
}

.page-about .chapter__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 3.4vw, 2.55rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  margin: 0 0 1.1rem;
}

.page-about .chapter__text p {
  margin: 0;
  max-width: 40rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .chapter__text p + p {
  margin-top: 1em;
}

.page-about .chapter__text--after {
  margin-top: clamp(1.2rem, 3vw, 1.75rem);
}

.page-about .about-link {
  color: var(--orange);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--ice);
  outline: none;
  background: rgba(255, 107, 26, 0.18);
}

.page-about .chapter__cta {
  margin: clamp(1.5rem, 3vw, 2rem) 0 0;
}

@media (min-width: 880px) {
  .page-about .chapter__grid {
    grid-template-columns: minmax(0, 3.1fr) minmax(0, 8.9fr);
    column-gap: clamp(2rem, 6vw, 5rem);
  }
  .page-about .chapter__aside {
    position: sticky;
    top: 6.5rem;
  }
}

/* 斜切分隔条 */
.page-about .chapter--skew::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: min(36%, 300px);
  height: 4px;
  background: var(--orange);
  transform: skewX(-40deg);
  transform-origin: left bottom;
  opacity: 0.85;
}

/* ---------- 图片 ---------- */
.page-about .chapter-figure {
  margin: clamp(1.5rem, 3vw, 2rem) 0 0;
  border: 2px solid var(--about-line-strong);
  box-shadow: 8px 8px 0 0 var(--ink-3);
}

.page-about .chapter-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
}

/* ---------- 三段式 ---------- */
.page-about .phases {
  display: grid;
  gap: 1px;
  margin-top: clamp(1.4rem, 3vw, 1.8rem);
  background: var(--about-line-strong);
  border: 1px solid var(--about-line-strong);
}

.page-about .phase {
  background: var(--ink-2);
  padding: 1.1rem 1rem 1.3rem;
}

.page-about .phase__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  color: var(--ink);
  background: var(--orange);
  padding: 0.22rem 0.5rem;
  margin-bottom: 0.7rem;
}

.page-about .phase:nth-child(2) .phase__tag {
  background: var(--silver);
}

.page-about .phase:nth-child(3) .phase__tag {
  background: var(--green);
}

.page-about .phase h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 700;
  color: var(--ice);
}

.page-about .phase p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.72;
  color: var(--fog);
}

@media (min-width: 640px) {
  .page-about .phases {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 更新节奏 ---------- */
.page-about .update-rows {
  list-style: none;
  margin: clamp(1.4rem, 3vw, 1.8rem) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-line-strong);
}

.page-about .update-row {
  display: grid;
  gap: 0.35rem;
  padding: 0.95rem 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .update-row__key {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .update-row__val {
  font-size: 0.93rem;
  line-height: 1.72;
  color: var(--about-soft);
}

@media (min-width: 720px) {
  .page-about .update-row {
    grid-template-columns: 10.5rem minmax(0, 1fr);
    align-items: baseline;
    column-gap: 1.5rem;
  }
}

/* ---------- 适配状态与步骤 ---------- */
.page-about .fit-status {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.35rem;
  margin-top: 1.3rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--fog);
}

.page-about .fit-status__item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.page-about .fit-steps {
  margin-top: clamp(1.3rem, 3vw, 1.7rem);
  border: 2px solid var(--about-line-strong);
}

.page-about .fit-step + .fit-step {
  border-top: 1px solid var(--about-line-strong);
}

.page-about .fit-step__summary {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.85rem 1rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--ice);
  background: var(--ink-2);
  transition: background 200ms var(--ease), color 200ms var(--ease);
}

.page-about .fit-step__summary::-webkit-details-marker {
  display: none;
}

.page-about .fit-step__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--orange);
}

.page-about .fit-step[open] .fit-step__summary::after {
  content: "–";
}

.page-about .fit-step__summary:hover {
  background: var(--ink-3);
}

.page-about .fit-step__summary:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--orange);
  background: var(--ink-3);
}

.page-about .fit-step__num {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .fit-step__body {
  padding: 0.85rem 1rem 1.15rem;
  background: var(--ink);
}

.page-about .fit-step__body p {
  margin: 0;
  max-width: 40rem;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--about-soft);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: clamp(1.5rem, 3vw, 2rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line-strong);
  border-block: 1px solid var(--about-line-strong);
}

.page-about .timeline__item {
  display: grid;
  gap: 0.35rem;
  padding: 1rem 1.05rem 1.15rem;
  background: var(--ink-2);
  transition: background 220ms var(--ease);
}

.page-about .timeline__item:hover,
.page-about .timeline__item:focus-within {
  background: var(--ink-3);
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .timeline__name {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 700;
  color: var(--ice);
}

.page-about .timeline__desc {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.72;
  color: var(--fog);
}

@media (min-width: 780px) {
  .page-about .timeline__item {
    grid-template-columns: 7.5rem minmax(0, 1fr);
    column-gap: 1.5rem;
    align-items: start;
    padding: 1.15rem 1.35rem;
  }
  .page-about .timeline__year {
    grid-row: 1 / span 2;
    padding-top: 0.15rem;
  }
}

/* ---------- 场馆背景章节 ---------- */
.page-about .chapter--venue {
  position: relative;
  overflow: hidden;
  border-bottom: 0;
}

.page-about .chapter--venue .chapter-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .chapter--venue .chapter-bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.24;
  filter: saturate(0.75);
}

.page-about .chapter--venue::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(180deg, rgba(6, 22, 37, 0.94) 0%, rgba(6, 22, 37, 0.74) 45%, rgba(6, 22, 37, 0.96) 100%);
}

.page-about .chapter--venue .container {
  position: relative;
  z-index: 2;
}

/* ---------- 浅色纸面章节 ---------- */
.page-about .chapter--paper {
  background: var(--paper);
  color: var(--ink);
  border-bottom-color: rgba(6, 22, 37, 0.16);
}

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

.page-about .chapter--paper .chapter__text p {
  color: var(--ink-2);
}

.page-about .chapter--paper .chapter__index {
  -webkit-text-stroke: 1.5px rgba(18, 59, 94, 0.5);
}

.page-about .chapter--paper .about-link {
  color: var(--orange-deep);
}

.page-about .chapter--paper .about-link:hover,
.page-about .chapter--paper .about-link:focus-visible {
  color: var(--ink);
  background: rgba(255, 107, 26, 0.2);
}

.page-about .chapter--paper .chapter-figure {
  border-color: rgba(6, 22, 37, 0.22);
  box-shadow: 8px 8px 0 0 rgba(18, 59, 94, 0.2);
}

.page-about .chapter--paper .fit-status {
  color: var(--ink-3);
}

.page-about .chapter--paper .fit-status__item:first-child {
  color: var(--ink-2);
}

.page-about .chapter--paper .fit-steps {
  border-color: rgba(6, 22, 37, 0.22);
}

.page-about .chapter--paper .fit-step + .fit-step {
  border-top-color: rgba(6, 22, 37, 0.16);
}

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

.page-about .chapter--paper .fit-step__summary:hover,
.page-about .chapter--paper .fit-step__summary:focus-visible {
  background: #dbe5ef;
}

.page-about .chapter--paper .fit-step__summary:focus-visible {
  box-shadow: inset 0 0 0 2px var(--orange-deep);
}

.page-about .chapter--paper .fit-step__num {
  color: var(--orange-deep);
}

.page-about .chapter--paper .fit-step__body {
  background: #f7fafd;
}

.page-about .chapter--paper .fit-step__body p {
  color: var(--ink-2);
}

/* ---------- 收尾行动带 ---------- */
.page-about .about-cta {
  position: relative;
  background: linear-gradient(135deg, var(--ink-2) 0%, var(--ink-3) 62%, var(--ink-2) 100%);
  border-top: 2px solid var(--orange);
  padding-block: clamp(2.5rem, 6vw, 4rem);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 1rem;
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.2vw, 2.2rem);
  line-height: 1.25;
  color: var(--ice);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 42rem;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 0.4rem;
}

/* ---------- 滚动显现 ---------- */
.page-about [data-reveal] {
  transition:
    opacity 380ms var(--ease) var(--reveal-delay, 0ms),
    transform 380ms var(--ease) var(--reveal-delay, 0ms);
}

.page-about [data-reveal].is-pending {
  opacity: 0;
  transform: translateY(18px);
}

.page-about [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about [data-reveal].is-pending,
  .page-about [data-reveal].is-revealed {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .page-about .timeline__item,
  .page-about .fit-step__summary,
  .page-about .about-link {
    transition: none;
  }
}
<<<END>>>