.page-about {
  --about-h1: clamp(34px, 7.2vw, 68px);
  --about-h2: clamp(25px, 4.4vw, 40px);
  --about-ink-a: rgba(11, 30, 58, .74);
  --about-snow-a: rgba(255, 255, 255, .76);
  --about-line: rgba(255, 255, 255, .09);
  background: var(--ink);
  color: var(--snow);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: clip;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
}

/* ---------- 通用排版件 ---------- */

.page-about .about-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--lake-2);
}

.page-about .about-eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
}

.page-about .about-eyebrow--dark {
  color: var(--lake);
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--about-h2);
  line-height: 1.06;
  letter-spacing: -.01em;
  margin-bottom: 14px;
  color: var(--snow);
}

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

.page-about .about-sub {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-snow-a);
  max-width: 62ch;
}

.page-about .about-body {
  margin: 0 0 24px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-ink-a);
}

.page-about .about-sec-head {
  max-width: 720px;
  margin-bottom: 40px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 30px 0 62px;
  background:
    radial-gradient(120% 92% at 88% -8%, rgba(28, 124, 140, .38), transparent 58%),
    linear-gradient(180deg, #0B1E3A 0%, #0A1A32 100%);
}

.page-about .about-hero__ridge {
  position: absolute;
  inset: 0 0 auto 0;
  height: 96px;
  color: var(--lake);
  opacity: .45;
  pointer-events: none;
}

.page-about .about-hero__ridge svg {
  display: block;
  width: 100%;
  height: 100%;
}

.page-about .about-hero__ridge path {
  stroke: currentColor;
}

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

.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 30px;
  font-size: 13px;
  color: var(--glacier);
}

.page-about .about-crumb a {
  color: var(--glacier);
  text-decoration: none;
  transition: color .16s var(--ease);
}

.page-about .about-crumb a:hover {
  color: var(--lake-2);
}

.page-about .about-crumb__sep {
  opacity: .5;
}

.page-about .about-crumb__here {
  color: var(--snow);
}

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

.page-about .about-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--about-h1);
  line-height: .96;
  letter-spacing: -.02em;
  margin-bottom: 20px;
  color: var(--snow);
}

.page-about .about-lead {
  margin: 0;
  max-width: 48ch;
  font-size: clamp(15.5px, 1.6vw, 18.5px);
  line-height: 1.82;
  color: rgba(255, 255, 255, .82);
}

.page-about .about-caps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-caps li {
  display: grid;
  gap: 4px;
  padding: 16px 18px;
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, .055);
  border: 1px solid var(--about-line);
}

.page-about .about-caps b {
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--flame);
}

.page-about .about-caps span {
  font-size: 14.5px;
  line-height: 1.68;
  color: rgba(255, 255, 255, .84);
}

/* ---------- 时间轴 ---------- */

.page-about .about-tl-section {
  padding: 68px 0 76px;
  background: var(--ink);
  border-top: 1px solid rgba(28, 124, 140, .22);
}

.page-about .about-tl-layout {
  display: grid;
  gap: 38px;
}

.page-about .about-tl {
  position: relative;
  display: grid;
  gap: 6px;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 33px;
  top: 20px;
  bottom: 20px;
  width: 1px;
  background: linear-gradient(180deg, rgba(28, 124, 140, .55), rgba(28, 124, 140, .1));
}

.page-about .about-tl__item {
  position: relative;
  z-index: 1;
  border-radius: var(--r-lg);
  border: 1px solid var(--about-line);
  background: rgba(255, 255, 255, .03);
  transition: border-color .18s var(--ease), background .18s var(--ease);
}

.page-about .about-tl__item[open] {
  border-color: rgba(28, 124, 140, .58);
  background: rgba(28, 124, 140, .1);
}

.page-about .about-tl__summary {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 17px 20px;
  list-style: none;
  cursor: pointer;
}

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

.page-about .about-tl__summary:focus-visible {
  outline: 2px solid var(--lake-2);
  outline-offset: 3px;
  border-radius: var(--r-lg);
}

.page-about .about-tl__node {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--lake);
}

.page-about .about-tl__item[open] .about-tl__node {
  color: var(--lake-2);
}

.page-about .about-tl__item.is-current .about-tl__node {
  color: var(--flame);
}

.page-about .about-tl__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  min-width: 0;
}

.page-about .about-tl__ver {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--lake-2);
}

.page-about .about-tl__item.is-current .about-tl__ver {
  color: var(--flame);
}

.page-about .about-tl__name {
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--snow);
}

.page-about .about-tl__hint {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .05em;
  padding: 3px 10px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(200, 211, 224, .26);
  color: var(--glacier);
  white-space: nowrap;
}

.page-about .about-tl__item.is-current .about-tl__hint {
  border-color: rgba(255, 107, 53, .5);
  color: var(--flame);
}

.page-about .about-tl__body {
  margin: 0 20px 20px;
  padding: 14px 18px;
  border-left: 3px solid var(--lake);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: rgba(11, 30, 58, .5);
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(255, 255, 255, .74);
}

.page-about .about-tl__body p {
  margin: 0 0 10px;
}

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

.page-about .about-tl-figure {
  margin: 0;
}

.page-about .about-tl-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--r-xl);
  filter: saturate(.92) contrast(1.05);
}

.page-about .about-tl-figure figcaption {
  margin-top: 12px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--glacier);
}

.page-about .about-jump {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 34px;
  padding: 12px 26px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(28, 124, 140, .55);
  color: var(--lake-2);
  font-size: 14.5px;
  text-decoration: none;
  transition: background .16s var(--ease), color .16s var(--ease);
}

.page-about .about-jump:hover {
  background: rgba(28, 124, 140, .18);
  color: var(--snow);
}

.page-about .about-jump:focus-visible {
  outline: 2px solid var(--lake-2);
  outline-offset: 3px;
}

/* ---------- 场馆网络 ---------- */

.page-about .about-venues {
  padding: 66px 0 70px;
  background: var(--snow-2);
  color: var(--ink);
}

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

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

.page-about .about-venues__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 5;
  object-fit: cover;
  border-radius: var(--r-xl);
}

.page-about .about-venues__figure figcaption {
  margin-top: 12px;
  font-size: 12.5px;
  line-height: 1.7;
  color: rgba(11, 30, 58, .6);
}

.page-about .about-stack {
  display: flex;
  gap: 3px;
  height: 22px;
  margin-bottom: 14px;
}

.page-about .about-stack__seg {
  position: relative;
  flex: 1 1 0;
  transition: filter .16s var(--ease);
}

.page-about .about-stack__seg:nth-child(1) {
  background: #1C7C8C;
  border-radius: var(--r-pill) 0 0 var(--r-pill);
}

.page-about .about-stack__seg:nth-child(2) {
  background: #25899A;
}

.page-about .about-stack__seg:nth-child(3) {
  background: #2E96A8;
}

.page-about .about-stack__seg:nth-child(4) {
  background: #37A3B6;
}

.page-about .about-stack__seg:nth-child(5) {
  background: #42B0C4;
  border-radius: 0 var(--r-pill) var(--r-pill) 0;
}

.page-about .about-stack__seg:hover {
  filter: brightness(1.12);
}

.page-about .about-stack__tip {
  position: absolute;
  bottom: calc(100% + 9px);
  left: 50%;
  z-index: 4;
  padding: 5px 11px;
  border-radius: var(--r-pill);
  background: var(--ink);
  color: var(--snow);
  font-size: 12px;
  line-height: 1.5;
  white-space: nowrap;
  opacity: 0;
  transform: translateX(-50%) translateY(4px);
  pointer-events: none;
  transition: opacity .16s var(--ease), transform .16s var(--ease);
}

.page-about .about-stack__seg:hover .about-stack__tip {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.page-about .about-legend {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin: 0;
  padding: 0;
  font-size: 13px;
  color: rgba(11, 30, 58, .7);
}

.page-about .about-legend li {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.page-about .about-legend i {
  display: inline-block;
  width: 9px;
  height: 9px;
  border-radius: 2px;
}

.page-about .about-legend li:nth-child(1) i {
  background: #1C7C8C;
}

.page-about .about-legend li:nth-child(2) i {
  background: #25899A;
}

.page-about .about-legend li:nth-child(3) i {
  background: #2E96A8;
}

.page-about .about-legend li:nth-child(4) i {
  background: #37A3B6;
}

.page-about .about-legend li:nth-child(5) i {
  background: #42B0C4;
}

.page-about .about-facts {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 36px 0 0;
  padding: 0;
}

.page-about .about-facts li {
  padding: 14px 16px;
  border-radius: var(--r-md);
  background: var(--snow);
  border: 1px solid rgba(11, 30, 58, .08);
}

.page-about .about-facts b {
  display: block;
  font-family: var(--font-mono);
  font-size: 23px;
  line-height: 1.2;
  letter-spacing: .02em;
  color: var(--ink);
  margin-bottom: 2px;
}

.page-about .about-facts span {
  font-size: 12.5px;
  line-height: 1.5;
  color: rgba(11, 30, 58, .62);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  padding: 68px 0 72px;
  background: linear-gradient(180deg, #0B1E3A 0%, #0A1A32 100%);
}

.page-about .about-roles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .about-role {
  padding: 20px 18px 22px;
  border-radius: var(--r-lg);
  background: rgba(255, 255, 255, .045);
  border: 1px solid var(--about-line);
  border-top: 2px solid var(--lake);
}

.page-about .about-role__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 29px;
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--snow);
  margin-bottom: 4px;
}

.page-about .about-role h3 {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--lake-2);
  margin-bottom: 8px;
}

.page-about .about-role p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: rgba(255, 255, 255, .66);
}

.page-about .about-check {
  margin-top: 22px;
  padding: 22px 22px 24px;
  border-radius: var(--r-lg);
  background: rgba(28, 124, 140, .12);
  border: 1px solid rgba(28, 124, 140, .34);
  border-left: 3px solid var(--flame);
}

.page-about .about-check p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(255, 255, 255, .8);
}

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

/* ---------- 版本 ---------- */

.page-about .about-version {
  padding: 66px 0 70px;
  background: var(--mist);
  color: var(--ink);
}

.page-about .about-version__grid {
  display: grid;
  gap: 32px;
  align-items: center;
}

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

.page-about .about-version__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--r-xl);
}

.page-about .about-list {
  list-style: none;
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
}

.page-about .about-list li {
  position: relative;
  padding-left: 22px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--about-ink-a);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--flame);
}

/* ---------- 合作 ---------- */

.page-about .about-coop {
  padding: 68px 0 84px;
  background:
    radial-gradient(90% 130% at 100% 0%, rgba(255, 107, 53, .14), transparent 58%),
    var(--ink-2);
  scroll-margin-top: 80px;
}

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

.page-about .about-coop__list {
  list-style: none;
  display: grid;
  gap: 14px;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-coop__list li {
  padding: 16px 18px;
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, .05);
  border-left: 3px solid var(--lake);
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(255, 255, 255, .76);
}

.page-about .about-coop__list b {
  display: block;
  margin-bottom: 4px;
  font-size: 15px;
  color: var(--snow);
}

.page-about .about-coop__aside {
  display: grid;
  gap: 20px;
  align-content: start;
}

.page-about .about-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 15px 30px;
  border-radius: var(--r-pill);
  background: var(--flame);
  color: var(--ink);
  font-size: 15.5px;
  font-weight: 700;
  text-decoration: none;
  transition: transform .16s var(--ease), filter .16s var(--ease);
}

.page-about .about-cta:hover {
  transform: translateY(-2px);
  filter: brightness(1.08);
}

.page-about .about-cta:focus-visible {
  outline: 2px solid var(--snow);
  outline-offset: 3px;
}

.page-about .about-coop__note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(255, 255, 255, .6);
}

.page-about .about-coop__note a {
  color: var(--lake-2);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 163, 179, .4);
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

.page-about .about-coop__note a:hover {
  color: var(--snow);
  border-color: var(--snow);
}

/* ---------- 断点 ---------- */

@media (max-width: 599px) {
  .page-about .about-tl__hint {
    display: none;
  }

  .page-about .about-tl__summary {
    grid-template-columns: 28px minmax(0, 1fr);
    padding: 15px 16px;
  }

  .page-about .about-tl::before {
    left: 29px;
  }

  .page-about .about-tl__body {
    margin: 0 16px 16px;
    padding: 13px 15px;
  }

  .page-about .about-hero {
    padding: 26px 0 52px;
  }
}

@media (min-width: 700px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 38px 0 78px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, 1fr);
    align-items: end;
    gap: 52px;
  }

  .page-about .about-venues {
    padding: 84px 0 88px;
  }

  .page-about .about-venues__grid {
    grid-template-columns: minmax(0, .94fr) minmax(0, 1.06fr);
    gap: 48px;
    align-items: center;
  }

  .page-about .about-version {
    padding: 84px 0 88px;
  }

  .page-about .about-version__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: 52px;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-coop {
    padding: 84px 0 96px;
  }

  .page-about .about-coop__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .5fr);
    gap: 64px;
    align-items: end;
  }

  .page-about .about-team {
    padding: 84px 0 88px;
  }
}

@media (min-width: 980px) {
  .page-about .about-tl-section {
    padding: 84px 0 92px;
  }

  .page-about .about-tl-layout {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}