.page-about {
  --ab-rail: clamp(196px, 17vw, 248px);
  --ab-gap: clamp(1.5rem, 4vw, 3.25rem);
  display: block;
  background: var(--bg);
  color: var(--ink);
  overflow-x: hidden;
}

/* ============ 首屏主题声明 ============ */
.page-about .about-open {
  position: relative;
  overflow: hidden;
  border-bottom: var(--line);
  background:
    radial-gradient(120% 80% at 8% -20%, rgba(25, 245, 208, .10), transparent 62%),
    radial-gradient(90% 70% at 92% 0%, rgba(0, 217, 255, .07), transparent 60%),
    var(--bg);
}

.page-about .about-open::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-soft) 1px, transparent 1px);
  background-size: 84px 84px;
  opacity: .28;
  pointer-events: none;
}

.page-about .about-open-inner {
  position: relative;
  padding-block: clamp(1.5rem, 4vw, 2.75rem) clamp(2rem, 5vw, 3.75rem);
}

.page-about .about-open .breadcrumb {
  margin-bottom: clamp(1.5rem, 3vw, 2.25rem);
}

.page-about .about-open h1 {
  font-family: var(--font-head);
  font-size: clamp(2.2rem, 7.5vw, 4.8rem);
  line-height: .98;
  letter-spacing: .015em;
  text-transform: uppercase;
  margin: .55rem 0 0;
  max-width: 22ch;
}

.page-about .about-open-body {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.5rem);
  margin-top: clamp(1.25rem, 3vw, 2rem);
}

@media (min-width: 980px) {
  .page-about .about-open-body {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }
}

.page-about .about-lede {
  font-size: clamp(1rem, 1.35vw, 1.15rem);
  line-height: 1.8;
  color: var(--ink);
  max-width: 60ch;
  margin: 0;
}

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

@media (min-width: 620px) {
  .page-about .open-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .open-stat {
  background: var(--bg-2);
  padding: 1rem 1.05rem 1.1rem;
}

.page-about .open-stat b {
  display: block;
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 3.2vw, 2.3rem);
  line-height: 1;
  color: var(--cyan);
}

.page-about .open-stat span {
  display: block;
  margin-top: .5rem;
  font-size: .76rem;
  letter-spacing: .08em;
  color: var(--ink-2);
}

/* ============ 侧栏 + 画布骨架 ============ */
.page-about .about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--ab-gap);
  padding-block: clamp(1.75rem, 4vw, 3rem);
}

@media (min-width: 1000px) {
  .page-about .about-grid {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: clamp(2rem, 3.5vw, 3.5rem);
  }
}

.page-about .about-rail {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  min-width: 0;
}

@media (min-width: 1000px) {
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--rail-top) + .85rem);
    align-self: start;
    max-height: calc(100vh - var(--rail-top) - 2rem);
    overflow: auto;
    padding-right: .35rem;
  }
}

.page-about .about-nav {
  border: var(--line);
  background: var(--bg-2);
  padding: 1rem 1.05rem 1.1rem;
}

.page-about .about-nav-title {
  margin: 0 0 .75rem;
  font-family: var(--font-head);
  font-size: .82rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-2);
}

.page-about .about-nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: .5rem;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-about .about-nav-list li {
  flex: 0 0 auto;
}

.page-about .about-nav-list a {
  display: block;
  padding: .45rem .7rem;
  border: 1px solid var(--grid);
  color: var(--ink);
  font-size: .82rem;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color .18s var(--ease), color .18s var(--ease), background-color .18s var(--ease);
}

.page-about .about-nav-list a:hover,
.page-about .about-nav-list a:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(25, 245, 208, .07);
}

@media (min-width: 1000px) {
  .page-about .about-nav-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }

  .page-about .about-nav-list li {
    flex: none;
    border-bottom: var(--line);
  }

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

  .page-about .about-nav-list a {
    border: 0;
    padding: .6rem 0;
    white-space: normal;
    line-height: 1.45;
  }

  .page-about .about-nav-list a:hover,
  .page-about .about-nav-list a:focus-visible {
    background: transparent;
    padding-left: .5rem;
  }
}

.page-about .about-axis {
  display: flex;
  gap: .55rem;
  overflow-x: auto;
  scrollbar-width: none;
  border-top: var(--line);
  padding-top: .85rem;
}

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

.page-about .about-axis span {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: .82rem;
  letter-spacing: .08em;
  color: var(--ink-2);
  border-left: 2px solid var(--grid);
  padding-left: .55rem;
  flex: 0 0 auto;
  line-height: 1.2;
}

.page-about .about-axis .axis-y1 { color: var(--ink-2); }
.page-about .about-axis .axis-y2 { color: var(--blue); border-color: var(--blue); }
.page-about .about-axis .axis-y3 { color: var(--amber); border-color: var(--amber); }
.page-about .about-axis .axis-y4 { color: var(--rose); border-color: var(--rose); }
.page-about .about-axis .axis-y5 { color: var(--cyan); border-color: var(--cyan); }

@media (min-width: 1000px) {
  .page-about .about-axis {
    flex-direction: column;
    gap: .7rem;
    overflow: visible;
  }

  .page-about .about-axis span {
    flex: none;
  }
}

/* ============ 章节通用 ============ */
.page-about .about-canvas {
  min-width: 0;
}

.page-about .about-section {
  padding-block: clamp(1.85rem, 4.5vw, 3.25rem);
  border-top: var(--line);
}

.page-about .about-canvas > .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec-head {
  max-width: 74ch;
  margin-bottom: clamp(1.4rem, 3vw, 2.25rem);
}

.page-about .about-section h2 {
  font-family: var(--font-head);
  font-size: clamp(1.65rem, 3.6vw, 2.8rem);
  line-height: 1.05;
  letter-spacing: .02em;
  text-transform: uppercase;
  margin: .5rem 0 0;
}

.page-about .about-sec-lede {
  margin: .9rem 0 0;
  color: var(--ink-2);
  line-height: 1.8;
  font-size: .98rem;
}

.page-about .about-section h3 {
  font-family: var(--font-head);
  font-size: 1.12rem;
  letter-spacing: .045em;
  text-transform: uppercase;
  margin: 0 0 .5rem;
  color: var(--ink);
}

.page-about .about-section p {
  line-height: 1.78;
}

/* ============ 时间线 ============ */
.page-about .arc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--line);
}

.page-about .arc-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: .6rem;
  padding: 1.35rem 0;
  border-bottom: var(--line);
}

@media (min-width: 720px) {
  .page-about .arc-item {
    grid-template-columns: clamp(88px, 11vw, 148px) minmax(0, 1fr);
    gap: clamp(1rem, 2.5vw, 2rem);
    align-items: start;
  }
}

.page-about .arc-year {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--blue);
}

.page-about .arc-item:nth-child(2) .arc-year { color: var(--blue); }
.page-about .arc-item:nth-child(3) .arc-year { color: var(--amber); }
.page-about .arc-item:nth-child(4) .arc-year { color: var(--rose); }
.page-about .arc-item--now .arc-year { color: var(--cyan); }

.page-about .arc-item--now {
  background: linear-gradient(90deg, rgba(25, 245, 208, .07), transparent 70%);
  border-left: 3px solid var(--cyan);
  padding-left: clamp(.85rem, 2vw, 1.5rem);
}

.page-about .arc-body p {
  margin: 0;
  color: var(--ink-2);
  font-size: .96rem;
  max-width: 66ch;
}

/* ============ 团队 ============ */
.page-about .team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.25rem, 3vw, 2.25rem);
  margin-bottom: clamp(1.5rem, 3vw, 2.25rem);
}

@media (min-width: 900px) {
  .page-about .team-layout {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }
}

.page-about .team-facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--grid);
  border: var(--line);
}

@media (min-width: 560px) {
  .page-about .team-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .team-fact {
  background: var(--bg-2);
  padding: 1rem 1.05rem 1.15rem;
}

.page-about .team-fact b {
  display: block;
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1;
  color: var(--cyan);
}

.page-about .team-fact span {
  display: block;
  margin-top: .35rem;
  font-size: .82rem;
  letter-spacing: .05em;
  color: var(--ink);
}

.page-about .team-fact p {
  margin: .55rem 0 0;
  font-size: .84rem;
  line-height: 1.65;
  color: var(--ink-2);
}

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

@media (min-width: 780px) {
  .page-about .wf-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1240px) {
  .page-about .wf-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .wf-step {
  background: var(--bg-2);
  padding: 1.15rem 1.15rem 1.3rem;
  border-top: 3px solid transparent;
}

.page-about .wf-step:nth-child(1) { border-top-color: var(--cyan); }
.page-about .wf-step:nth-child(2) { border-top-color: var(--blue); }
.page-about .wf-step:nth-child(3) { border-top-color: var(--amber); }
.page-about .wf-step:nth-child(4) { border-top-color: var(--rose); }

.page-about .wf-num {
  display: block;
  font-family: var(--font-data);
  font-size: .78rem;
  letter-spacing: .16em;
  color: var(--ink-2);
  margin-bottom: .5rem;
}

.page-about .wf-step h3 {
  font-size: 1rem;
}

.page-about .wf-step p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.7;
  color: var(--ink-2);
}

/* ============ 更新节奏 ============ */
.page-about .cadence-matrix {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--grid);
  border: var(--line);
}

@media (min-width: 720px) {
  .page-about .cadence-matrix {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .cadence-cell {
  background: var(--bg-2);
  padding: clamp(1.15rem, 2.5vw, 1.65rem);
}

.page-about .cadence-cell--amber {
  background: linear-gradient(150deg, rgba(255, 176, 32, .10), var(--bg-2) 65%);
}

.page-about .cad-fig {
  display: block;
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.1rem, 5.4vw, 3.4rem);
  line-height: 1;
  color: var(--cyan);
}

.page-about .cadence-cell--amber .cad-fig {
  color: var(--amber);
}

.page-about .cad-fig em,
.page-about .reach-fig em {
  font-style: normal;
  font-size: .48em;
  margin-left: .12em;
  vertical-align: super;
}

.page-about .cad-label {
  display: block;
  margin-top: .6rem;
  font-size: .86rem;
  letter-spacing: .06em;
  color: var(--ink);
}

.page-about .cadence-cell p {
  margin: .6rem 0 0;
  font-size: .88rem;
  line-height: 1.7;
  color: var(--ink-2);
}

/* ============ 合作生态 ============ */
.page-about .tag-row {
  list-style: none;
  margin: 0 0 1.35rem;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .55rem;
}

.page-about .partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--grid);
  border: var(--line);
}

@media (min-width: 820px) {
  .page-about .partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .partner-item {
  background: var(--bg-2);
  padding: 1.15rem 1.15rem 1.3rem;
}

.page-about .partner-item p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.72;
  color: var(--ink-2);
}

.page-about .honor-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--grid);
  border: var(--line);
  border-top: 3px solid var(--amber);
  margin-top: 1.5rem;
}

@media (min-width: 720px) {
  .page-about .honor-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .honor-item {
  background: var(--bg);
  padding: 1.1rem 1.15rem;
  display: flex;
  gap: .9rem;
  align-items: baseline;
}

.page-about .honor-year {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--amber);
  flex: 0 0 auto;
}

.page-about .honor-item p {
  margin: 0;
  font-size: .9rem;
  color: var(--ink);
  line-height: 1.6;
}

/* ============ 服务地区 ============ */
.page-about .reach-stats {
  list-style: none;
  margin: clamp(1.35rem, 3vw, 2rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--grid);
  border: var(--line);
}

@media (min-width: 860px) {
  .page-about .reach-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .reach-stats li {
  background: var(--bg-2);
  padding: 1.1rem 1.05rem 1.2rem;
}

.page-about .reach-fig {
  display: block;
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  line-height: 1;
  color: var(--blue);
}

.page-about .reach-stats li:nth-child(2) .reach-fig { color: var(--cyan); }
.page-about .reach-stats li:nth-child(3) .reach-fig { color: var(--rose); }
.page-about .reach-stats li:nth-child(4) .reach-fig { color: var(--amber); }

.page-about .reach-label {
  display: block;
  margin-top: .55rem;
  font-size: .8rem;
  line-height: 1.6;
  color: var(--ink-2);
}

/* ============ 场馆 ============ */
.page-about .venue-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--grid);
  border: var(--line);
  margin-top: clamp(1.25rem, 3vw, 1.85rem);
}

@media (min-width: 780px) {
  .page-about .venue-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .venue-item {
  background: var(--bg-2);
  padding: 1.15rem 1.15rem 1.3rem;
}

.page-about .venue-item h3 {
  color: var(--cyan);
}

.page-about .venue-item p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--ink-2);
}

.page-about .field-list {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  border-top: var(--line);
}

.page-about .field-list li {
  display: grid;
  grid-template-columns: 1fr;
  gap: .3rem;
  padding: .9rem 0;
  border-bottom: var(--line);
}

@media (min-width: 680px) {
  .page-about .field-list li {
    grid-template-columns: clamp(96px, 14vw, 150px) minmax(0, 1fr);
    gap: 1.25rem;
    align-items: baseline;
  }
}

.page-about .field-list span {
  font-family: var(--font-head);
  font-size: .95rem;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--ink);
}

.page-about .field-list p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--ink-2);
}

/* ============ 媒体块 ============ */
.page-about .about-media {
  margin: 0;
  border: var(--line);
  background: var(--bg-2);
  overflow: hidden;
}

.page-about .about-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.88) contrast(1.06) brightness(.94);
}

.page-about .about-media--10x7 img { aspect-ratio: 10 / 7; }
.page-about .about-media--3x2 img { aspect-ratio: 3 / 2; }
.page-about .about-media--2x1 img { aspect-ratio: 2 / 1; }

.page-about .about-media figcaption {
  padding: .7rem .95rem .8rem;
  border-top: var(--line);
  font-size: .78rem;
  line-height: 1.6;
  color: var(--ink-2);
}

.page-about #venues .about-media {
  margin-bottom: clamp(1.25rem, 3vw, 1.85rem);
}

/* ============ 收尾 ============ */
.page-about .about-section--cta {
  border-top: 0;
  padding-top: clamp(1.5rem, 3vw, 2rem);
}

.page-about .about-cta {
  border: 3px solid var(--grid);
  background:
    linear-gradient(140deg, rgba(0, 217, 255, .08), transparent 55%),
    var(--bg-2);
  box-shadow: var(--hard-shadow);
  padding: clamp(1.5rem, 4vw, 2.75rem);
}

.page-about .about-cta h2 {
  font-size: clamp(1.6rem, 3.4vw, 2.5rem);
}

.page-about .about-cta p {
  margin: .9rem 0 0;
  color: var(--ink-2);
  max-width: 62ch;
  font-size: .96rem;
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: clamp(1.25rem, 3vw, 1.85rem);
}

.page-about .cta-actions .btn {
  text-decoration: none;
}

/* ============ 动效 ============ */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about [data-reveal].is-visible {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .about-nav-list a {
    transition: none;
  }
}