.page-about {
  --about-gap: clamp(46px, 7vw, 96px);
  --about-side-card: rgba(30, 43, 39, 0.78);
  display: block;
}

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--jk-cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

/* 面包屑 */
.page-about .about-crumb {
  padding-block: 18px 4px;
}

/* 首屏 */
.page-about .about-hero {
  display: grid;
  gap: 30px;
  padding-block: clamp(18px, 4vw, 40px) clamp(34px, 6vw, 74px);
}

.page-about .about-hero__main {
  min-width: 0;
}

.page-about .about-hero h1 {
  font-family: var(--jk-font-display);
  font-weight: 900;
  font-size: clamp(38px, 9vw, 84px);
  line-height: 0.96;
  letter-spacing: -0.04em;
  color: var(--jk-white);
  margin: 10px 0 0;
}

.page-about .about-hero__sub {
  display: block;
  margin-top: 16px;
  font-size: clamp(15px, 3.4vw, 21px);
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: 0.01em;
  color: var(--jk-cyan);
}

.page-about .about-hero__lede {
  margin-top: 20px;
  max-width: 46ch;
  color: var(--jk-fg-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__panel {
  border: 1px solid var(--jk-line);
  border-top: 2px solid var(--jk-gold);
  background: linear-gradient(180deg, rgba(30, 43, 39, 0.9), rgba(11, 31, 26, 0.9));
  box-shadow: var(--jk-shadow);
  padding: 20px 20px 8px;
}

.page-about .about-hero__panel-title {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--jk-gold);
  margin: 0 0 12px;
}

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

.page-about .about-stat__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--jk-line);
}

.page-about .about-stat__row:last-child {
  border-bottom: 0;
}

.page-about .about-stat__k {
  font-size: 13px;
  color: var(--jk-mist);
  margin: 0;
}

.page-about .about-stat__v {
  font-family: var(--jk-font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 22px;
  color: var(--jk-cyan);
  margin: 0;
  letter-spacing: -0.02em;
}

/* 章节索引 */
.page-about .about-index {
  padding-bottom: clamp(20px, 4vw, 40px);
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 15px;
  border: 1px solid var(--jk-line);
  border-radius: var(--jk-radius);
  color: var(--jk-fg-soft);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: border-color var(--jk-dur-fast) var(--jk-ease), color var(--jk-dur-fast) var(--jk-ease),
    background-color var(--jk-dur-fast) var(--jk-ease);
}

.page-about .about-index__link .jk-num {
  font-family: var(--jk-font-mono);
  font-size: 12px;
  color: var(--jk-orange);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--jk-cyan-line);
  color: var(--jk-white);
  background-color: rgba(47, 243, 208, 0.08);
}

/* 章节通用 */
.page-about .about-chapter {
  padding-block: var(--about-gap);
}

.page-about .about-chapter__head {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 16px;
  align-items: start;
  padding-bottom: 22px;
  margin-bottom: clamp(24px, 4vw, 44px);
  border-bottom: 1px solid var(--jk-line);
}

.page-about .about-chapter__num {
  grid-row: 1 / span 2;
  font-family: var(--jk-font-display);
  font-weight: 900;
  font-size: clamp(40px, 10vw, 108px);
  line-height: 0.78;
  letter-spacing: -0.05em;
  color: rgba(47, 243, 208, 0.22);
  -webkit-text-stroke: 1px rgba(47, 243, 208, 0.6);
}

.page-about .about-chapter__title {
  font-family: var(--jk-font-display);
  font-weight: 900;
  font-size: clamp(23px, 4.6vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.03em;
  margin: 0;
  color: var(--jk-white);
}

.page-about .about-chapter__note {
  margin: 10px 0 0;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--jk-mist);
}

.page-about .about-prose {
  color: var(--jk-fg-soft);
  max-width: 60ch;
}

.page-about .about-prose p {
  margin: 0 0 16px;
}

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

.page-about .about-prose--wide {
  max-width: 68ch;
  margin-bottom: 30px;
}

/* 品牌起点侧栏 */
.page-about .about-side-card {
  border-left: 2px solid var(--jk-cyan-line);
  padding: 4px 0 4px 18px;
}

.page-about .about-side-card__label {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--jk-gold);
  margin: 0 0 14px;
}

.page-about .about-audience {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-audience li {
  position: relative;
  padding: 9px 0 9px 18px;
  font-size: 15px;
  color: var(--jk-fg);
  border-bottom: 1px solid var(--jk-line);
}

.page-about .about-audience li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 17px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--jk-orange);
}

.page-about .about-side-card__foot {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--jk-mist);
}

/* 时间线 */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 10px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(180deg, var(--jk-cyan) 0%, rgba(201, 162, 39, 0.55) 58%, rgba(174, 185, 179, 0.14) 100%);
}

.page-about .about-node {
  position: relative;
  padding-left: 38px;
  padding-bottom: 30px;
}

.page-about .about-node:last-child {
  padding-bottom: 0;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--jk-ink);
  border: 2px solid var(--jk-cyan);
  transition: background-color var(--jk-dur-fast) var(--jk-ease), box-shadow var(--jk-dur-fast) var(--jk-ease);
}

.page-about .about-node:hover::before {
  background: var(--jk-cyan);
  box-shadow: 0 0 0 5px rgba(47, 243, 208, 0.16);
}

.page-about .about-node__meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.page-about .about-node__year {
  font-family: var(--jk-font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--jk-mist);
}

.page-about .about-node__title {
  margin: 0 0 8px;
  font-family: var(--jk-font-display);
  font-size: clamp(19px, 3.4vw, 25px);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: var(--jk-white);
}

.page-about .about-node__text {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--jk-fg-soft);
}

.page-about .about-node__more {
  margin-top: 12px;
  border: 1px solid var(--jk-line);
  background: rgba(5, 7, 6, 0.28);
  transition: border-color var(--jk-dur-fast) var(--jk-ease), transform var(--jk-dur-fast) var(--jk-ease);
}

.page-about .about-node__more:hover {
  border-color: var(--jk-cyan-line);
  transform: translateY(-2px);
}

.page-about .about-node__more summary {
  cursor: pointer;
  list-style: none;
  padding: 10px 14px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--jk-cyan);
}

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

.page-about .about-node__more summary::before {
  content: "+";
  display: inline-block;
  width: 14px;
  margin-right: 6px;
  font-family: var(--jk-font-mono);
  color: var(--jk-orange);
}

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

.page-about .about-node__more ul {
  margin: 0;
  padding: 0 14px 14px 32px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--jk-mist);
}

/* 图片 */
.page-about .about-figure {
  margin: 0;
  aspect-ratio: auto;
  overflow: hidden;
  border: 1px solid var(--jk-line);
  border-radius: var(--jk-radius-md);
  background: rgba(5, 7, 6, 0.4);
}

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

.page-about .about-figure .jk-media__caption {
  padding: 12px 14px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--jk-mist);
  border-top: 1px solid var(--jk-line);
}

/* 指标条 */
.page-about .about-metrics {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(26px, 4vw, 46px);
}

.page-about .about-metric {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 16px;
  border-left: 3px solid var(--jk-orange);
  background: rgba(11, 31, 26, 0.07);
}

.page-about .about-metric__v {
  font-family: var(--jk-font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(26px, 6vw, 38px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--jk-ink);
}

.page-about .about-metric__k {
  font-size: 13px;
  line-height: 1.5;
  color: rgba(11, 31, 26, 0.72);
}

/* 流程 */
.page-about .about-flow {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-flow__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 14px 16px;
  border-left: 3px solid var(--jk-orange);
  background: rgba(11, 31, 26, 0.06);
  transition: background-color var(--jk-dur-fast) var(--jk-ease), transform var(--jk-dur-fast) var(--jk-ease);
}

.page-about .about-flow__item:hover {
  background: rgba(11, 31, 26, 0.11);
  transform: translateX(3px);
}

.page-about .about-flow__step {
  font-family: var(--jk-font-mono);
  font-weight: 700;
  font-size: 14px;
  color: var(--jk-orange);
}

.page-about .about-flow__body {
  font-size: 15px;
  line-height: 1.7;
  color: var(--jk-ink);
}

/* 团队 */
.page-about .about-team {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
  border-top: 1px solid var(--jk-line);
}

.page-about .about-team__item {
  padding: 20px 0;
  border-bottom: 1px solid var(--jk-line);
  transition: padding-left var(--jk-dur-fast) var(--jk-ease), border-color var(--jk-dur-fast) var(--jk-ease);
}

.page-about .about-team__item:hover {
  padding-left: 10px;
  border-bottom-color: var(--jk-cyan-line);
}

.page-about .about-team__idx {
  font-family: var(--jk-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--jk-gold);
}

.page-about .about-team__role {
  margin: 6px 0 6px;
  font-family: var(--jk-font-display);
  font-size: 20px;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--jk-white);
}

.page-about .about-team__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--jk-fg-soft);
  max-width: 42ch;
}

/* 合作 */
.page-about .about-partners {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-partner {
  padding-top: 14px;
  border-top: 1px solid var(--jk-line-strong);
}

.page-about .about-partner__name {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--jk-cyan);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--jk-fg-soft);
  max-width: 44ch;
}

.page-about .about-partners__foot {
  margin: 14px 0 0;
  font-size: 13px;
  color: var(--jk-mist);
}

.page-about .about-partners__foot a {
  color: var(--jk-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 体验标准 */
.page-about .about-standard {
  padding: 2px 0 0 16px;
  border-left: 2px solid var(--jk-orange);
  margin-bottom: 24px;
  color: var(--jk-ink);
}

.page-about .about-standard__title {
  margin: 0 0 8px;
  font-family: var(--jk-font-display);
  font-size: 19px;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--jk-ink);
}

.page-about .about-standard p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(11, 31, 26, 0.78);
}

.page-about .about-award {
  display: grid;
  gap: 10px;
  margin-top: 10px;
  padding: 20px;
  border: 2px solid rgba(11, 31, 26, 0.16);
  background: rgba(201, 162, 39, 0.14);
}

.page-about .about-award__tag {
  justify-self: start;
  background: var(--jk-ink);
  color: var(--jk-paper);
}

.page-about .about-award__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--jk-ink);
  max-width: 62ch;
}

/* 行动区块 */
.page-about .about-cta {
  padding-block: clamp(44px, 7vw, 88px);
  background:
    radial-gradient(circle at 12% 0%, rgba(47, 243, 208, 0.14), transparent 58%),
    linear-gradient(160deg, var(--jk-char), var(--jk-ink));
  border-top: 1px solid var(--jk-line);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 26px;
}

.page-about .about-cta__title {
  margin: 10px 0 12px;
  font-family: var(--jk-font-display);
  font-weight: 900;
  font-size: clamp(26px, 5.4vw, 44px);
  line-height: 1.12;
  letter-spacing: -0.03em;
  color: var(--jk-white);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--jk-fg-soft);
}

.page-about .about-cta__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.page-about .about-cta__back {
  color: var(--jk-mist);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid var(--jk-line);
  padding-bottom: 2px;
  transition: color var(--jk-dur-fast) var(--jk-ease), border-color var(--jk-dur-fast) var(--jk-ease);
}

.page-about .about-cta__back:hover,
.page-about .about-cta__back:focus-visible {
  color: var(--jk-cyan);
  border-color: var(--jk-cyan);
}

/* 响应式 */
@media (min-width: 700px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-metric {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 30px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.55fr) minmax(300px, 0.85fr);
    align-items: end;
    gap: clamp(36px, 5vw, 64px);
  }

  .page-about .about-hero__panel {
    padding: 24px 24px 10px;
  }

  .page-about .about-chapter__note {
    writing-mode: vertical-rl;
    position: absolute;
    right: 0;
    top: 2px;
    margin: 0;
    padding-left: 6px;
  }

  .page-about .about-chapter__head {
    padding-right: 40px;
  }

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

  .page-about .about-team {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    column-gap: 22px;
  }

  .page-about .about-team__item {
    padding: 22px 8px 22px 0;
    border-top: 2px solid rgba(47, 243, 208, 0.24);
    border-bottom: 0;
  }

  .page-about .about-team__item:hover {
    padding-left: 0;
    border-top-color: var(--jk-cyan);
    border-bottom-color: transparent;
  }

  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }

  .page-about .about-award {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
    gap: 18px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.8fr);
    align-items: center;
    gap: 40px;
  }

  .page-about .about-cta__links {
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-flow__item,
  .page-about .about-team__item,
  .page-about .about-node__more,
  .page-about .about-index__link {
    transition: none;
  }

  .page-about .about-flow__item:hover,
  .page-about .about-node__more:hover {
    transform: none;
  }
}
<<<END>>>