.page-about {
  --kb-rail: 232px;
  --kb-gap: clamp(28px, 4vw, 64px);
  background:
    radial-gradient(120% 80% at 82% -10%, rgba(18, 58, 94, .85) 0%, rgba(7, 20, 38, 0) 62%),
    linear-gradient(180deg, #071426 0%, #071426 100%);
  color: var(--ky-white);
  overflow-x: clip;
}

.page-about .kb-cover {
  position: relative;
  padding: clamp(22px, 3.6vw, 44px) 0 clamp(38px, 5vw, 76px);
  border-bottom: 1px solid var(--ky-line-faint);
}

.page-about .kb-cover::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: linear-gradient(90deg, var(--ky-orange) 0%, rgba(255, 107, 26, 0) 46%);
}

.page-about .kb-cover__inner {
  display: block;
}

.page-about .kb-cover__text {
  max-width: 42ch;
}

.page-about .ky-breadcrumb {
  margin: 0 0 clamp(20px, 3vw, 34px);
}

.page-about .kb-cover__title {
  margin: 12px 0 0;
  font-size: clamp(38px, 8.6vw, 92px);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -.02em;
  color: var(--ky-white);
}

.page-about .kb-cover__lead {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 54ch;
  font-size: clamp(15px, 1.4vw, 18px);
  line-height: 1.78;
  color: var(--ky-mist);
}

.page-about .kb-cover__facts {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 3vw, 44px);
  margin: clamp(26px, 3.6vw, 44px) 0 0;
  padding: clamp(18px, 2.4vw, 26px) 0 0;
  border-top: 1px solid var(--ky-line-faint);
}

.page-about .kb-fact {
  min-width: 108px;
}

.page-about .kb-fact dt {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--ky-mist);
  margin-bottom: 6px;
}

.page-about .kb-fact dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 5px;
  color: var(--ky-orange);
}

.page-about .kb-fact dd small {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--ky-mist);
}

.page-about .kb-cover__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.2vw, 38px);
}

.page-about .kb-cover__media {
  margin: clamp(30px, 4.4vw, 0px) 0 0;
}

.page-about .kb-cover__media .ky-media {
  border: 1px solid var(--ky-line-faint);
  background: #0D223D;
}

.page-about .kb-cover__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 4;
}

/* ---------- 主体骨架：左索引 + 右内容流 ---------- */
.page-about .kb-body {
  padding: clamp(38px, 5vw, 72px) var(--ky-gutter) clamp(56px, 8vw, 120px);
}

.page-about .kb-index {
  border-top: 2px solid var(--ky-orange);
  padding-top: 16px;
  margin-bottom: clamp(34px, 5vw, 0px);
}

.page-about .kb-index__title {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--ky-mist);
  text-transform: uppercase;
}

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

.page-about .kb-index__list li + li {
  border-top: 1px solid var(--ky-line-faint);
}

.page-about .kb-index__list a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 2px 11px 10px;
  border-left: 2px solid transparent;
  color: var(--ky-white);
  font-size: 14px;
  text-decoration: none;
  transition: border-color .25s var(--ky-ease), color .25s var(--ky-ease), background-color .25s var(--ky-ease);
}

.page-about .kb-index__list a span {
  font-family: var(--ky-font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ky-orange);
}

.page-about .kb-index__list a:hover,
.page-about .kb-index__list a:focus-visible {
  border-left-color: var(--ky-orange);
  background: rgba(13, 34, 61, .7);
  color: var(--ky-orange);
  outline: none;
}

.page-about .kb-index__note {
  margin: 18px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--ky-mist);
}

/* ---------- 章节 ---------- */
.page-about .kb-sec {
  padding-bottom: clamp(44px, 6vw, 88px);
  margin-bottom: clamp(44px, 6vw, 88px);
  border-bottom: 1px solid var(--ky-line-faint);
}

.page-about .kb-sec--last {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-about .kb-sec__head {
  margin-bottom: clamp(22px, 3vw, 38px);
}

.page-about .kb-sec__title {
  margin: 12px 0 0;
  font-size: clamp(26px, 4.4vw, 44px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -.015em;
  color: var(--ky-white);
  max-width: 22ch;
}

.page-about .kb-sec__intro {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ky-mist);
}

.page-about .kb-para {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: clamp(15px, 1.3vw, 17px);
  line-height: 1.86;
  color: var(--ky-mist);
}

.page-about .kb-para--wide {
  max-width: 74ch;
  margin-top: clamp(28px, 4vw, 44px);
  color: var(--ky-white);
  font-size: clamp(15px, 1.35vw, 18px);
}

.page-about .kb-split {
  display: block;
}

.page-about .kb-split__side {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .kb-note {
  border-left: 2px solid var(--ky-orange);
  background: rgba(13, 34, 61, .82);
}

.page-about .kb-note .ky-label {
  margin: 0 0 8px;
}

.page-about .kb-note__title {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 700;
  color: var(--ky-white);
}

.page-about .kb-note__body {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ky-mist);
}

/* ---------- 团队条形图 ---------- */
.page-about .kb-bars {
  list-style: none;
  margin: 0 0 clamp(26px, 3.6vw, 40px);
  padding: 0;
  border-top: 1px solid var(--ky-line-faint);
}

.page-about .kb-bars__row {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr) 34px;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--ky-line-faint);
}

.page-about .kb-bars__role {
  font-size: 13px;
  color: var(--ky-white);
}

.page-about .kb-bars__track {
  display: block;
  height: 8px;
  background: rgba(42, 74, 107, .38);
}

.page-about .kb-bars__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--ky-orange), var(--ky-amber));
}

.page-about .kb-bars__row:nth-child(1) .kb-bars__fill { width: 32%; }
.page-about .kb-bars__row:nth-child(2) .kb-bars__fill { width: 24%; }
.page-about .kb-bars__row:nth-child(3) .kb-bars__fill { width: 18%; }
.page-about .kb-bars__row:nth-child(4) .kb-bars__fill { width: 13%; background: linear-gradient(90deg, var(--ky-steppe), var(--ky-line)); }
.page-about .kb-bars__row:nth-child(5) .kb-bars__fill { width: 13%; background: linear-gradient(90deg, var(--ky-steppe), var(--ky-line)); }

.page-about .kb-bars__count {
  font-family: var(--ky-font-mono);
  font-size: 17px;
  font-weight: 700;
  text-align: right;
  color: var(--ky-orange);
}

/* ---------- 图 ---------- */
.page-about .kb-figure {
  margin: 0 0 clamp(28px, 4vw, 44px);
}

.page-about .kb-figure .ky-media {
  border: 1px solid var(--ky-line-faint);
  background: #0D223D;
}

.page-about .kb-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 14 / 9;
}

.page-about .kb-media--strip img {
  aspect-ratio: 8 / 3;
}

/* ---------- 角色卡 ---------- */
.page-about .kb-roles {
  gap: 1px;
  background: var(--ky-line-faint);
  border: 1px solid var(--ky-line-faint);
}

.page-about .kb-role {
  background: rgba(13, 34, 61, .72);
  padding: clamp(18px, 2.4vw, 26px);
}

.page-about .kb-role .ky-label {
  margin: 0 0 10px;
}

.page-about .kb-role h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--ky-white);
}

.page-about .kb-role p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ky-mist);
}

/* ---------- 数据工作台 ---------- */
.page-about .kb-desk {
  gap: 16px;
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-about .kb-desk__card {
  background: rgba(13, 34, 61, .82);
  display: flex;
  flex-direction: column;
}

.page-about .kb-desk__title {
  margin: 10px 0 14px;
  font-size: 20px;
  font-weight: 700;
  color: var(--ky-white);
}

.page-about .kb-desk__body {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ky-mist);
}

.page-about .kb-viz {
  position: relative;
  height: 96px;
  border: 1px solid var(--ky-line-faint);
  overflow: hidden;
  background-color: rgba(7, 20, 38, .78);
  background-image:
    linear-gradient(rgba(42, 74, 107, .48) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 74, 107, .48) 1px, transparent 1px);
  background-size: 16px 16px;
}

.page-about .kb-viz__heat {
  position: absolute;
  left: 10%;
  bottom: 0;
  width: 48%;
  height: 68%;
  background: linear-gradient(0deg, rgba(255, 59, 78, .52), rgba(255, 59, 78, 0));
}

.page-about .kb-viz__line {
  position: absolute;
  left: 10%;
  top: 58%;
  width: 76%;
  height: 2px;
  background: var(--ky-green);
  box-shadow: 0 0 0 1px rgba(57, 255, 136, .2);
}

.page-about .kb-viz__spark {
  position: absolute;
  inset: 22% 12% 24% 12%;
  border-bottom: 2px solid var(--ky-orange);
  transform: skewY(-7deg);
}

.page-about .kb-viz--list {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
  padding: 0 18px;
}

.page-about .kb-viz--list span {
  display: block;
  height: 5px;
  background: var(--ky-orange);
}

.page-about .kb-viz--list span:nth-child(1) { width: 88%; }
.page-about .kb-viz--list span:nth-child(2) { width: 66%; background: var(--ky-amber); }
.page-about .kb-viz--list span:nth-child(3) { width: 48%; background: var(--ky-green); }
.page-about .kb-viz--list span:nth-child(4) { width: 30%; background: var(--ky-line); }

.page-about .kb-metrics {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  background: var(--ky-line-faint);
  border: 1px solid var(--ky-line-faint);
}

.page-about .kb-metrics > div {
  background: rgba(18, 58, 94, .5);
  padding: 18px 20px;
}

.page-about .kb-metrics dt {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--ky-mist);
  margin-bottom: 8px;
}

.page-about .kb-metrics dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
  color: var(--ky-orange);
}

.page-about .kb-metrics dd small {
  font-size: 12px;
  color: var(--ky-mist);
}

/* ---------- 时间线 ---------- */
.page-about .kb-timeline {
  list-style: none;
  margin: 0 0 clamp(32px, 4.6vw, 56px);
  padding: 0;
  position: relative;
}

.page-about .kb-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--ky-orange) 0%, rgba(42, 74, 107, .45) 88%);
}

.page-about .kb-timeline__item {
  position: relative;
  padding-left: 32px;
}

.page-about .kb-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 11px;
  height: 11px;
  background: var(--ky-orange);
}

.page-about .kb-stage {
  border-bottom: 1px solid var(--ky-line-faint);
}

.page-about .kb-stage__sum {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 14px 2px;
  cursor: pointer;
  list-style: none;
  transition: color .25s var(--ky-ease);
}

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

.page-about .kb-stage__sum:hover,
.page-about .kb-stage__sum:focus-visible {
  outline: none;
}

.page-about .kb-stage__sum:hover .kb-stage__name,
.page-about .kb-stage__sum:focus-visible .kb-stage__name {
  color: var(--ky-orange);
}

.page-about .kb-stage__stage {
  font-family: var(--ky-font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--ky-mist);
}

.page-about .kb-stage__name {
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 700;
  color: var(--ky-white);
  transition: color .25s var(--ky-ease);
}

.page-about .kb-stage__hint {
  margin-left: auto;
  font-family: var(--ky-font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ky-orange);
}

.page-about .kb-stage__body {
  padding: 0 2px 20px;
}

.page-about .kb-stage__body p {
  margin: 0;
  max-width: 66ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ky-mist);
}

/* ---------- 合作生态 ---------- */
.page-about .kb-eco {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--ky-line-faint);
  border: 1px solid var(--ky-line-faint);
}

.page-about .kb-eco__item {
  background: rgba(7, 20, 38, .86);
  padding: clamp(20px, 2.6vw, 30px);
}

.page-about .kb-eco__no {
  display: block;
  font-family: var(--ky-font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--ky-orange);
  margin-bottom: 12px;
}

.page-about .kb-eco__item h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--ky-white);
}

.page-about .kb-eco__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--ky-mist);
}

/* ---------- 选择理由 ---------- */
.page-about .kb-why {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .kb-why__panel {
  background:
    linear-gradient(180deg, rgba(18, 58, 94, .72), rgba(13, 34, 61, .92));
  border-top: 2px solid var(--ky-orange);
}

.page-about .kb-why__panel .ky-label {
  margin: 0 0 12px;
}

.page-about .kb-why__num {
  margin: 0 0 12px;
  color: var(--ky-white);
}

.page-about .kb-why__body {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--ky-mist);
}

.page-about .kb-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(26px, 3.4vw, 40px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .kb-cover__inner {
    display: grid;
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    gap: clamp(28px, 4vw, 60px);
    align-items: center;
  }

  .page-about .kb-cover__media {
    margin-top: 0;
  }

  .page-about .kb-split {
    display: grid;
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: clamp(24px, 3vw, 44px);
    align-items: start;
  }

  .page-about .kb-split__side {
    margin-top: 0;
  }

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

  .page-about .kb-eco {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .kb-bars__row {
    grid-template-columns: 110px minmax(0, 1fr) 44px;
    gap: 18px;
  }
}

@media (min-width: 1000px) {
  .page-about .kb-body {
    display: grid;
    grid-template-columns: var(--kb-rail) minmax(0, 1fr);
    gap: var(--kb-gap);
    align-items: start;
  }

  .page-about .kb-index {
    position: sticky;
    top: calc(var(--ky-header-h) + 24px);
    margin-bottom: 0;
  }

  .page-about .kb-flow {
    min-width: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .kb-index__list a,
  .page-about .kb-stage__name,
  .page-about .kb-stage__sum {
    transition: none;
  }
}