.page-about {
  background: var(--cream);
  color: var(--ink);
  overflow-x: clip;
}

.page-about .about-mark {
  display: block;
  width: 66px;
  height: 13px;
  margin-bottom: 14px;
  background:
    linear-gradient(var(--mint), var(--mint)) 0 0 / 22px 3px no-repeat,
    linear-gradient(var(--orange), var(--orange)) 22px 5px / 22px 3px no-repeat,
    linear-gradient(rgba(152, 164, 169, .55), rgba(152, 164, 169, .55)) 44px 10px / 22px 3px no-repeat;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-narrow);
  letter-spacing: -.01em;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: rgba(36, 28, 22, .55);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  margin-top: calc(var(--header-h) * -1);
  padding: calc(var(--header-h) + 36px) 0 56px;
  color: var(--cream);
  background:
    radial-gradient(120% 90% at 88% 4%, rgba(52, 224, 192, .15), transparent 58%),
    radial-gradient(90% 80% at 4% 96%, rgba(140, 46, 40, .3), transparent 60%),
    var(--night);
}

.page-about .about-hero__crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(245, 239, 226, .55);
}

.page-about .about-hero__crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(245, 239, 226, .3);
}

.page-about .about-hero__crumbs a {
  color: var(--mint);
  text-decoration: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: 34px;
}

.page-about .about-hero h1 {
  margin: 12px 0 18px;
  font-size: clamp(31px, 7.2vw, 54px);
  font-weight: 800;
  line-height: 1.16;
  color: var(--cream);
}

.page-about .about-hero .lede {
  max-width: 44ch;
  font-size: 16.5px;
  line-height: 1.8;
  color: rgba(245, 239, 226, .82);
}

.page-about .about-hero__sign {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid rgba(152, 164, 169, .28);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .02em;
  color: rgba(52, 224, 192, .9);
}

.page-about .about-hero__stage {
  position: relative;
  aspect-ratio: 5 / 4;
  border-radius: var(--radius);
  border: 1px solid rgba(152, 164, 169, .3);
  background:
    repeating-linear-gradient(to bottom, rgba(152, 164, 169, .12) 0 1px, transparent 1px 40px),
    linear-gradient(155deg, rgba(52, 224, 192, .13), rgba(6, 20, 18, .3) 62%),
    var(--charcoal);
  overflow: hidden;
}

.page-about .about-hero__board {
  position: absolute;
  left: 7%;
  top: 10%;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 13px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(52, 224, 192, .38);
  background: rgba(6, 20, 18, .74);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.page-about .board-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 6.4vw, 32px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .board-unit {
  font-size: 13px;
  color: rgba(245, 239, 226, .86);
}

.page-about .board-since {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: rgba(152, 164, 169, .95);
}

.page-about .tier-list {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: flex-end;
  gap: 8px;
  padding: 0 8% 0 6%;
}

.page-about .tier {
  flex: 1 1 0;
  height: calc(20% + var(--t));
  border-top: 2px solid var(--mint);
  border-radius: 3px 3px 0 0;
  background: linear-gradient(180deg, rgba(52, 224, 192, .4), rgba(52, 224, 192, .02));
}

/* ============ 章节索引条 ============ */
.page-about .about-index {
  position: sticky;
  top: var(--header-h);
  z-index: 20;
  background: rgba(245, 239, 226, .95);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--hairline);
}

.page-about .about-index ul {
  display: flex;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-index a {
  display: block;
  padding: 14px 12px;
  white-space: nowrap;
  font-size: 13.5px;
  text-decoration: none;
  color: rgba(36, 28, 22, .6);
  border-bottom: 2px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-index a:hover {
  color: var(--ink);
}

.page-about .about-index a.is-active {
  color: var(--night);
  border-bottom-color: var(--orange);
}

/* ============ 通用区块 ============ */
.page-about .section {
  padding-top: 54px;
  padding-bottom: 54px;
}

.page-about .prose p {
  max-width: 34em;
}

.page-about h2 {
  margin: 0 0 18px;
  font-size: clamp(24px, 4.6vw, 34px);
  font-weight: 800;
  line-height: 1.24;
}

/* ============ 为什么是看台 ============ */
.page-about .about-why {
  background: var(--cream);
}

.page-about .about-why__grid {
  display: grid;
  gap: 32px;
}

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

.page-about .about-why__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
}

.page-about .about-why__media figcaption,
.page-about .about-team__media figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .02em;
  color: rgba(36, 28, 22, .52);
}

.page-about .about-why__media figcaption {
  color: rgba(36, 28, 22, .55);
}

/* ============ 编辑与校验 ============ */
.page-about .about-team {
  color: var(--cream);
  background:
    radial-gradient(80% 60% at 92% 0%, rgba(52, 224, 192, .12), transparent 62%),
    var(--night);
}

.page-about .about-team h2 {
  color: var(--cream);
}

.page-about .about-team .eyebrow {
  color: var(--mint);
}

.page-about .about-team__lede {
  max-width: 40em;
  margin: 0;
  font-size: 16.5px;
  line-height: 1.8;
  color: rgba(245, 239, 226, .8);
}

.page-about .about-team__grid {
  display: grid;
  gap: 32px;
  margin-top: 32px;
}

.page-about .about-team__facts {
  display: grid;
}

.page-about .fact-row {
  display: grid;
  grid-template-columns: minmax(78px, auto) minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 17px 0;
  border-bottom: 1px solid rgba(152, 164, 169, .24);
}

.page-about .fact-row:first-child {
  border-top: 1px solid rgba(152, 164, 169, .24);
}

.page-about .fact-num {
  justify-self: start;
  padding-bottom: 4px;
  font-family: var(--font-mono);
  font-size: clamp(26px, 5vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
  border-bottom: 2px solid var(--mint);
}

.page-about .fact-label {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(245, 239, 226, .8);
}

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

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid rgba(152, 164, 169, .24);
}

.page-about .about-team__media figcaption {
  color: rgba(245, 239, 226, .58);
}

.page-about .about-team__prose {
  margin-top: 34px;
}

.page-about .about-team__prose p {
  max-width: 44em;
  color: rgba(245, 239, 226, .78);
}

/* ============ 版本时间轴 ============ */
.page-about .about-versions {
  background: linear-gradient(180deg, rgba(230, 220, 200, .5), rgba(245, 239, 226, 0) 40%), var(--cream);
}

.page-about .about-versions__lede {
  max-width: 42em;
  margin: 0;
  font-size: 16.5px;
  line-height: 1.8;
  color: rgba(36, 28, 22, .72);
}

.page-about .about-versions__list {
  position: relative;
  margin-top: 34px;
  padding-left: 26px;
}

.page-about .about-versions__list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--orange), rgba(152, 164, 169, .35));
}

.page-about .v-item {
  position: relative;
  margin-bottom: 12px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, .55);
  transition: border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .v-item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 22px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--steel);
  box-shadow: 0 0 0 4px var(--cream);
}

.page-about .v-item[open]::before {
  background: var(--orange);
}

.page-about .v-item[open] {
  background: #fff;
  border-color: rgba(255, 122, 41, .45);
}

.page-about .v-item > summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .v-item > summary::-webkit-details-marker {
  display: none;
}

.page-about .v-item__ver {
  flex: 0 0 auto;
  padding: 3px 9px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--night);
  background: var(--mint);
}

.page-about .v-item[open] .v-item__ver {
  background: var(--orange);
  color: #1c1206;
}

.page-about .v-item__name {
  flex: 1 1 auto;
  font-family: var(--font-narrow);
  font-size: 16.5px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .v-item__hint {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: rgba(36, 28, 22, .48);
}

.page-about .v-item__body {
  padding: 0 16px 16px;
}

.page-about .v-item__body p {
  max-width: 40em;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(36, 28, 22, .78);
}

/* ============ 观众画像 ============ */
.page-about .about-audience {
  background: var(--cream-dim);
}

.page-about .about-audience__tabs {
  margin-top: 26px;
}

.page-about .about-audience__tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-audience__tablist .tab {
  padding: 11px 17px;
  border-radius: 999px;
  border: 1px solid rgba(36, 28, 22, .16);
  background: rgba(255, 255, 255, .6);
  font: inherit;
  font-size: 14.5px;
  color: rgba(36, 28, 22, .72);
  cursor: pointer;
  transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-audience__tablist .tab:hover {
  border-color: rgba(36, 28, 22, .34);
}

.page-about .about-audience__tablist .tab[aria-selected="true"] {
  background: var(--night);
  border-color: var(--night);
  color: var(--cream);
}

.page-about .about-audience__panels {
  margin-top: 24px;
}

.page-about .about-audience__panels > [data-panel] {
  display: none;
}

.page-about .about-audience__panels > [data-panel].is-active {
  display: block;
}

.page-about .audience-panel {
  display: grid;
  gap: 20px;
  padding: 26px 22px;
  border-radius: var(--radius);
  border: 1px solid rgba(36, 28, 22, .1);
  background:
    linear-gradient(150deg, rgba(52, 224, 192, .1), rgba(245, 239, 226, 0) 58%),
    #fff;
}

.page-about .audience-panel__kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--brick);
}

.page-about .audience-panel__line {
  margin: 0;
  font-family: var(--font-narrow);
  font-size: clamp(19px, 3.4vw, 23px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .audience-panel .prose p:first-child {
  margin-top: 0;
}

/* ============ 内容合作 ============ */
.page-about .about-partners {
  background: var(--cream);
}

.page-about .about-partners__lede {
  max-width: 42em;
  margin: 0;
  font-size: 16.5px;
  line-height: 1.8;
  color: rgba(36, 28, 22, .72);
}

.page-about .about-partners__grid {
  display: grid;
  gap: 16px;
  margin-top: 30px;
}

.page-about .about-partners__card {
  padding: 26px 24px;
  background: #fff;
}

.page-about .partners-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(44px, 10vw, 64px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-partners__card h3 {
  margin: 6px 0 14px;
  font-size: 20px;
  font-weight: 700;
  color: var(--night);
}

.page-about .about-partners__card p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(36, 28, 22, .76);
}

.page-about .about-partners__prose {
  margin-top: 30px;
}

.page-about .about-partners__prose p {
  max-width: 46em;
  color: rgba(36, 28, 22, .78);
}

/* ============ 城市夜景通栏 ============ */
.page-about .about-city {
  position: relative;
  margin: 0;
  line-height: 0;
}

.page-about .about-city::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 55%;
  background: linear-gradient(180deg, rgba(20, 24, 26, 0), rgba(20, 24, 26, .92));
}

.page-about .about-city img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 360px;
  object-fit: cover;
}

/* ============ 找到我们 ============ */
.page-about .about-contact {
  padding-top: 44px;
  color: var(--cream);
  background:
    radial-gradient(70% 60% at 12% 0%, rgba(242, 193, 78, .12), transparent 62%),
    var(--charcoal);
}

.page-about .about-contact h2 {
  color: var(--cream);
}

.page-about .about-contact .eyebrow {
  color: var(--mint);
}

.page-about .about-contact__lede {
  max-width: 42em;
  margin: 0;
  font-size: 16.5px;
  line-height: 1.8;
  color: rgba(245, 239, 226, .78);
}

.page-about .about-contact__list {
  display: grid;
  margin-top: 28px;
}

.page-about .about-contact__item {
  padding: 15px 0;
  border-top: 1px solid rgba(152, 164, 169, .24);
}

.page-about .about-contact__label {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--mint);
}

.page-about .about-contact__value {
  margin: 0;
  font-size: 16px;
  line-height: 1.6;
  color: var(--cream);
  word-break: break-word;
}

.page-about .about-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 30px 0 0;
}

/* ============ 响应式 ============ */
@media (min-width: 700px) {
  .page-about .about-contact__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 44px;
  }

  .page-about .about-partners__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 900px) {
  .page-about .section {
    padding-top: 76px;
    padding-bottom: 76px;
  }

  .page-about .about-hero {
    padding-top: calc(var(--header-h) + 64px);
    padding-bottom: 88px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .about-hero__stage {
    transform: translateY(14px);
  }

  .page-about .about-why__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 60px;
    align-items: start;
  }

  .page-about .about-why__media {
    margin-top: 44px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 52px;
    align-items: start;
    margin-top: 40px;
  }

  .page-about .about-versions__list {
    padding-left: 34px;
    margin-top: 40px;
  }

  .page-about .about-versions__list::before {
    left: 6px;
  }

  .page-about .v-item::before {
    left: -34px;
  }

  .page-about .v-item > summary {
    padding: 18px 22px;
  }

  .page-about .v-item__body {
    padding: 0 22px 20px 22px;
  }

  .page-about .audience-panel {
    grid-template-columns: minmax(0, 4fr) minmax(0, 6fr);
    gap: 40px;
    padding: 34px 36px;
    align-items: start;
  }

  .page-about .about-partners__card {
    padding: 32px 30px;
  }
}

@media (min-width: 1120px) {
  .page-about .about-hero__stage {
    aspect-ratio: 16 / 13;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index a,
  .page-about .v-item,
  .page-about .about-audience__tablist .tab {
    transition: none;
  }

  .page-about .about-hero__stage {
    transform: none;
  }
}

.page-about {
  --t: 1rem;
}