.page-about {
  --about-line: 1px solid var(--edge);
  --about-soft: rgba(61, 245, 208, 0.12);
  display: block;
  padding-bottom: var(--space-7);
}

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

.page-about .about-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 245, 208, 0.45);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--fog);
  border-color: var(--fog);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: var(--space-5) 0 var(--space-4);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -12% -25% auto -25%;
  height: 118%;
  background:
    linear-gradient(118deg, rgba(15, 111, 120, 0.6) 0%, rgba(14, 22, 51, 0) 46%),
    linear-gradient(300deg, rgba(255, 106, 61, 0.22) 0%, rgba(7, 11, 29, 0) 58%);
  clip-path: polygon(0 0, 100% 0, 100% 76%, 0 100%);
  z-index: -1;
  pointer-events: none;
}

.page-about .about-hero__inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--space-3);
  display: grid;
  gap: var(--space-4);
}

.page-about .about-hero__copy .breadcrumb {
  margin-bottom: var(--space-2);
}

.page-about .about-hero__copy h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6.4vw, 68px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: var(--space-1) 0 var(--space-3);
  max-width: 16em;
}

.page-about .about-hero__lead {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  color: var(--fog);
  max-width: 36em;
  margin: 0 0 var(--space-2);
}

.page-about .about-hero__lead--sub {
  color: var(--metal);
  font-size: 15px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-top: var(--space-3);
}

.page-about .about-hero__media {
  margin: 0;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: var(--about-line);
  background:
    linear-gradient(140deg, rgba(15, 111, 120, 0.5), rgba(22, 35, 71, 0.9) 60%, rgba(180, 55, 44, 0.35));
  transform: rotate(-1.2deg);
  box-shadow: 0 24px 60px rgba(4, 8, 20, 0.55);
}

.page-about .about-hero__media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-hero__media figcaption {
  padding: 10px var(--space-2) 12px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--metal);
  background: rgba(7, 11, 29, 0.72);
}

.page-about .about-hero__meta {
  list-style: none;
  margin: var(--space-4) auto 0;
  padding: var(--space-2) var(--space-3);
  max-width: var(--content-max);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-3);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--metal);
  border-top: var(--about-line);
  border-bottom: var(--about-line);
}

.page-about .about-hero__meta li {
  position: relative;
  padding-left: 14px;
}

.page-about .about-hero__meta li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  margin-top: -3px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .about-hero__meta li:last-child::before {
  background: var(--orange);
}

/* ---------- 章节锚点 ---------- */

.page-about .about-jump {
  max-width: var(--content-max);
  margin: 0 auto var(--space-6);
  padding: var(--space-3);
  display: flex;
  gap: var(--space-1);
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-jump a {
  flex: 0 0 auto;
  padding: 8px 16px;
  border-radius: var(--pill);
  border: 1px solid var(--edge);
  background: rgba(14, 22, 51, 0.6);
  color: var(--metal);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  color: var(--bg);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 通用章节外壳 ---------- */

.page-about .about-section {
  max-width: var(--content-max);
  margin: 0 auto var(--space-6);
  padding: 0 var(--space-3);
}

.page-about .about-section__head {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.page-about .about-section__index {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--cyan);
  padding: 4px 10px;
  border: 1px solid rgba(61, 245, 208, 0.35);
  border-radius: var(--pill);
  flex: 0 0 auto;
}

.page-about .about-section__head .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  font-size: clamp(24px, 4vw, 44px);
  line-height: 1.15;
}

.page-about .about-panel {
  padding: var(--space-3);
  border: var(--about-line);
  border-radius: var(--radius-lg);
  background: var(--panel-1);
}

.page-about .about-panel .prose p {
  margin: 0 0 var(--space-2);
  font-size: 16px;
  line-height: 1.75;
  color: var(--fog);
}

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

/* ---------- 品牌起点 ---------- */

.page-about .about-origin__facts {
  margin: var(--space-4) 0 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
  border-top: var(--about-line);
  padding-top: var(--space-3);
}

.page-about .about-origin__facts > div {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-origin__facts dt {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--metal);
}

.page-about .about-origin__facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--fog);
  letter-spacing: 0.04em;
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

/* ---------- 内容准则 ---------- */

.page-about .about-standards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
}

.page-about .about-standard {
  position: relative;
  padding: var(--space-3);
  border-radius: var(--radius-lg);
  border: var(--about-line);
  border-top: 3px solid var(--cyan);
  background: var(--panel-2);
}

.page-about .about-standard:nth-child(2) {
  border-top-color: var(--orange);
}

.page-about .about-standard:nth-child(3) {
  border-top-color: var(--lime);
}

.page-about .about-standard__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--metal);
}

.page-about .about-standard h3 {
  margin: var(--space-1) 0 var(--space-1);
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .about-standard p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--metal);
}

/* ---------- 团队分工 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.page-about .about-team__body .prose p {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--fog);
}

.page-about .about-tree {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0 0 0 var(--space-3);
  border-left: 1px solid var(--edge);
  display: grid;
  gap: var(--space-3);
}

.page-about .about-tree__item {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-2);
  align-items: start;
}

.page-about .about-tree__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--space-3) - 5px);
  top: 12px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(61, 245, 208, 0.14);
}

.page-about .about-tree__item--hub::before {
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 61, 0.18);
}

.page-about .about-tree__node {
  min-width: 46px;
  padding: 4px 8px;
  text-align: center;
  border-radius: var(--radius-sm);
  background: var(--about-soft);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .about-tree__node--hub {
  background: rgba(255, 106, 61, 0.14);
  color: var(--orange);
}

.page-about .about-tree__text h3 {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .about-tree__text p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--metal);
}

.page-about .about-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: var(--about-line);
  background:
    linear-gradient(150deg, rgba(15, 111, 120, 0.4), rgba(22, 35, 71, 0.95) 65%, rgba(180, 55, 44, 0.3));
}

.page-about .about-figure img {
  width: 100%;
  object-fit: cover;
}

.page-about .about-team__figure img {
  aspect-ratio: 14 / 9;
}

.page-about .about-figure figcaption {
  padding: 10px var(--space-2) 12px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--metal);
  background: rgba(7, 11, 29, 0.6);
}

/* ---------- 版本演进 ---------- */

.page-about .about-versions-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.page-about .about-versions {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
  position: relative;
}

.page-about .about-version {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3) var(--space-3);
  border-radius: var(--radius-md);
  border: var(--about-line);
  background: var(--panel-1);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-version:hover,
.page-about .about-version:focus-within {
  border-color: rgba(61, 245, 208, 0.55);
  background: var(--panel-2);
}

.page-about .about-version--current {
  border-color: rgba(255, 106, 61, 0.5);
  background: linear-gradient(150deg, rgba(255, 106, 61, 0.12), rgba(14, 22, 51, 0.95) 55%);
}

.page-about .about-version__flag {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex-wrap: wrap;
}

.page-about .about-version__no {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 3px 12px;
  border-radius: var(--pill);
  color: var(--cyan);
  background: rgba(61, 245, 208, 0.12);
  border: 1px solid rgba(61, 245, 208, 0.4);
}

.page-about .about-version--current .about-version__no {
  color: var(--bg);
  background: var(--orange);
  border-color: var(--orange);
}

.page-about .about-version__name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .about-version__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--metal);
}

.page-about .about-version__more {
  margin-top: var(--space-2);
}

.page-about .about-version__more > summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--orange);
  border-bottom: 1px dashed rgba(255, 106, 61, 0.5);
  padding-bottom: 2px;
}

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

.page-about .about-version__more > summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-weight: 700;
}

.page-about .about-version__more[open] > summary::before {
  content: "−";
}

.page-about .about-version__more ul {
  margin: var(--space-2) 0 0;
  padding-left: var(--space-3);
  display: grid;
  gap: 8px;
}

.page-about .about-version__more li {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--metal);
}

.page-about .about-version__more li::marker {
  color: var(--orange);
}

.page-about .about-versions__figure img {
  aspect-ratio: 4 / 5;
}

/* ---------- 场馆网络 ---------- */

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
  padding-bottom: var(--space-3);
  border-bottom: var(--about-line);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  background: var(--panel-2);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 5vw, 38px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-stat:nth-child(2n) .about-stat__num {
  color: var(--orange);
}

.page-about .about-stat__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--metal);
}

.page-about .about-venues__body {
  padding-top: var(--space-3);
}

.page-about .about-venues__lead {
  margin: 0 0 var(--space-3);
  font-size: 16px;
  line-height: 1.75;
  color: var(--fog);
  max-width: 38em;
}

.page-about .about-tags {
  list-style: none;
  margin: 0 0 var(--space-3);
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.page-about .about-venues__note {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--metal);
  padding-top: var(--space-2);
  border-top: 1px dashed var(--edge);
}

/* ---------- 周三校准 ---------- */

.page-about .about-calibration .calibration-chip {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 var(--space-3);
  padding: 8px 16px;
  border-radius: var(--pill);
  background: rgba(255, 106, 61, 0.12);
  border: 1px solid rgba(255, 106, 61, 0.4);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--orange);
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.page-about .about-steps li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-2);
  align-items: start;
}

.page-about .about-steps__no {
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(61, 245, 208, 0.14);
  border: 1px solid rgba(61, 245, 208, 0.45);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-steps h3 {
  margin: 4px 0 4px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .about-steps p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--metal);
}

.page-about .about-calibration__data {
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: var(--about-line);
  display: grid;
  gap: var(--space-2);
}

.page-about .about-calibration__data p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--metal);
  max-width: 40em;
}

/* ---------- 结尾入口 ---------- */

.page-about .about-cta {
  max-width: var(--content-max);
  margin: var(--space-6) auto 0;
  padding: var(--space-4) var(--space-3);
  display: grid;
  gap: var(--space-3);
  border-radius: var(--radius-xl);
  border: 1px solid var(--edge);
  background:
    linear-gradient(120deg, rgba(15, 111, 120, 0.4), rgba(22, 35, 71, 0.92) 55%, rgba(180, 55, 44, 0.3));
}

.page-about .about-cta__copy h2 {
  margin: 0 0 var(--space-1);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3.6vw, 34px);
  letter-spacing: -0.02em;
  color: var(--fog);
}

.page-about .about-cta__copy p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--metal);
  max-width: 34em;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

/* ---------- 宽屏 ---------- */

@media (min-width: 720px) {
  .page-about .about-origin__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-3);
  }

  .page-about .about-standards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-panel {
    padding: var(--space-4);
  }

  .page-about .about-cta {
    grid-template-columns: 1fr auto;
    align-items: center;
    padding: var(--space-5) var(--space-4);
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding: var(--space-6) 0 var(--space-5);
  }

  .page-about .about-hero__inner {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
    gap: var(--space-5);
  }

  .page-about .about-hero__media {
    transform: rotate(-2deg) translateY(-8px);
  }

  .page-about .about-team {
    grid-template-columns: 1.08fr 0.92fr;
    align-items: start;
  }

  .page-about .about-versions-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 360px);
    align-items: start;
    gap: var(--space-5);
  }

  .page-about .about-versions__figure {
    position: sticky;
    top: calc(var(--topbar-h) + var(--space-3));
  }

  .page-about .about-version {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: var(--space-2);
    align-items: start;
    padding: var(--space-3);
  }

  .page-about .about-version__flag {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .page-about .about-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-3);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__media {
    transform: none;
  }

  .page-about .about-jump a,
  .page-about .about-version,
  .page-about .about-link {
    transition: none;
  }
}
<<<END>>>