.page-about {
  --about-gap: 18px;
  --about-card-radius: var(--ke-radius-md);
  background: var(--ke-ink);
  color: var(--ke-cream);
  overflow-x: clip;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  padding: 96px 0 52px;
  background:
    radial-gradient(120% 78% at 88% 4%, rgba(79, 240, 208, 0.10), transparent 56%),
    radial-gradient(100% 72% at 2% 0%, rgba(255, 107, 44, 0.15), transparent 54%);
}

.page-about .about-hero .ke-crumbs {
  margin-bottom: 28px;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-size: clamp(32px, 7.4vw, 60px);
  line-height: 1.07;
  letter-spacing: -0.025em;
  font-weight: 900;
  text-wrap: balance;
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 33em;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(243, 233, 210, 0.82);
}

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

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 34px;
  margin: 30px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--ke-line);
}

.page-about .about-hero__meta div {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .about-hero__meta dt {
  font-family: var(--ke-font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ke-mist);
}

.page-about .about-hero__meta dd {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-about .about-hero__trace {
  margin: 0;
  padding: 20px 16px 14px;
  border: 1px solid var(--ke-line);
  border-radius: var(--ke-radius-lg);
  background: linear-gradient(180deg, rgba(21, 27, 66, 0.94), rgba(11, 16, 48, 0.66));
  box-shadow: 0 26px 64px -34px rgba(0, 0, 0, 0.92);
}

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

.page-about .about-hero__trace-grid line {
  stroke: rgba(138, 147, 184, 0.22);
  stroke-width: 1;
}

.page-about .about-hero__trace-line {
  fill: none;
  stroke: var(--ke-orange);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.page-about .about-hero__trace-dots circle {
  fill: var(--ke-ink);
  stroke: var(--ke-cyan);
  stroke-width: 2.5;
}

.page-about .about-hero__trace-axis {
  display: flex;
  justify-content: space-between;
  margin: 6px 8px 0;
  font-family: var(--ke-font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--ke-mist);
}

.page-about .about-hero__trace-cap {
  margin: 14px 4px 0;
  padding-top: 12px;
  border-top: 1px solid var(--ke-line-soft);
  font-size: 12.5px;
  line-height: 1.6;
  color: rgba(243, 233, 210, 0.66);
}

/* ============ 章节索引 ============ */
.page-about .about-index {
  padding: 0 0 8px;
}

.page-about .about-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 16px 0 20px;
  border-top: 1px solid var(--ke-line-soft);
  border-bottom: 1px solid var(--ke-line-soft);
}

.page-about .about-index__item {
  list-style: none;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--ke-line);
  border-radius: var(--ke-pill);
  font-size: 13px;
  color: rgba(243, 233, 210, 0.78);
  text-decoration: none;
  transition: border-color 0.22s var(--ke-ease), color 0.22s var(--ke-ease), background-color 0.22s var(--ke-ease);
}

.page-about .about-index__link .ke-mono {
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--ke-gold);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--ke-cyan);
  color: var(--ke-cyan);
  background: rgba(79, 240, 208, 0.07);
}

/* ============ 通用章节 ============ */
.page-about .about-section {
  padding: 62px 0 10px;
  scroll-margin-top: 96px;
}

.page-about .about-section__head {
  max-width: 40em;
  margin-bottom: 30px;
}

.page-about .about-section__head .ke-h2 {
  margin: 10px 0 0;
  font-size: clamp(25px, 4.4vw, 38px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  font-weight: 800;
  text-wrap: balance;
}

.page-about .about-section__head .ke-lede {
  margin: 14px 0 0;
  max-width: 32em;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(243, 233, 210, 0.72);
}

/* ============ 起点 ============ */
.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-about .about-origin__text p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.84;
  color: rgba(243, 233, 210, 0.84);
}

.page-about .about-origin__text p:first-child {
  font-size: 16.5px;
  color: var(--ke-cream);
}

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

.page-about .about-origin__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: var(--about-card-radius);
  border: 1px solid var(--ke-line);
}

.page-about .about-origin__figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ke-mist);
}

.page-about .about-origin__note {
  margin-top: 18px;
  padding: 16px 18px;
  border-left: 3px solid var(--ke-orange);
  background: rgba(21, 27, 66, 0.72);
  border-radius: 0 var(--ke-radius-sm) var(--ke-radius-sm) 0;
}

.page-about .about-origin__note p:first-child {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ke-gold);
}

.page-about .about-origin__note p:last-child {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(243, 233, 210, 0.8);
}

/* ============ 时间线 ============ */
.page-about .about-timeline__texture {
  margin: 0 0 34px;
}

.page-about .about-timeline__texture img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 12 / 5;
  object-fit: cover;
  border-radius: var(--about-card-radius);
  border: 1px solid var(--ke-line);
  opacity: 0.86;
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 4px 0 4px 30px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 16px;
  width: 2px;
  background: linear-gradient(180deg, var(--ke-orange), rgba(79, 240, 208, 0.5) 62%, rgba(138, 147, 184, 0.1));
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 30px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 7px;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--ke-ink);
  border: 2px solid var(--ke-orange);
}

.page-about .about-timeline__item:nth-child(n + 5)::before {
  border-color: var(--ke-cyan);
}

.page-about .about-timeline__era {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ke-cyan);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.35;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 34em;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(243, 233, 210, 0.74);
}

/* ============ 团队 ============ */
.page-about .about-team__figure {
  margin: 0 0 26px;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--about-card-radius);
  border: 1px solid var(--ke-line);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-team__card {
  padding: 22px 20px;
  border: 1px solid var(--ke-line);
  border-radius: var(--about-card-radius);
  background: rgba(21, 27, 66, 0.62);
  transition: border-color 0.24s var(--ke-ease), background-color 0.24s var(--ke-ease);
}

.page-about .about-team__card:nth-child(2) {
  background: rgba(21, 27, 66, 0.42);
}

.page-about .about-team__card:hover {
  border-color: rgba(79, 240, 208, 0.5);
  background: rgba(21, 27, 66, 0.82);
}

.page-about .about-team__no {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ke-gold);
}

.page-about .about-team__role {
  margin: 0 0 10px;
  font-size: 19px;
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ke-cream);
}

.page-about .about-team__card p:last-child {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: rgba(243, 233, 210, 0.76);
}

/* ============ 维护方法（奶油纸面） ============ */
.page-about .about-method {
  padding: 30px 22px 26px;
  border-radius: var(--ke-radius-lg);
  background: var(--ke-cream);
  color: var(--ke-brown);
  box-shadow: 0 30px 70px -44px rgba(0, 0, 0, 0.95);
}

.page-about .about-method .ke-eyebrow {
  color: #8d4a1d;
}

.page-about .about-method .ke-h2 {
  margin: 10px 0 0;
  font-size: clamp(24px, 4.2vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--ke-brown);
  text-wrap: balance;
}

.page-about .about-method__lede {
  margin: 14px 0 0;
  max-width: 32em;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(29, 24, 20, 0.72);
}

.page-about .about-method__list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: method;
}

.page-about .about-method__item {
  counter-increment: method;
  position: relative;
  padding: 16px 0 16px 40px;
  border-top: 1px solid var(--ke-cream-line);
}

.page-about .about-method__item::before {
  content: counter(method, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 17px;
  font-family: var(--ke-font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ke-orange);
}

.page-about .about-method__item h3 {
  margin: 0 0 7px;
  font-size: 16.5px;
  line-height: 1.35;
  font-weight: 800;
  color: var(--ke-brown);
}

.page-about .about-method__item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(29, 24, 20, 0.78);
}

/* ============ 数据源与合作 ============ */
.page-about .about-sources__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-sources__col {
  padding: 24px 20px;
  border: 1px solid var(--ke-line);
  border-radius: var(--about-card-radius);
  background: linear-gradient(160deg, rgba(21, 27, 66, 0.9), rgba(11, 16, 48, 0.55));
}

.page-about .about-sources__col--alt {
  border-color: rgba(255, 107, 44, 0.42);
  background: linear-gradient(160deg, rgba(255, 107, 44, 0.12), rgba(11, 16, 48, 0.6));
}

.page-about .about-sources__title {
  margin: 0 0 12px;
  font-size: 18px;
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-sources__col p {
  margin: 0 0 12px;
  font-size: 13.5px;
  line-height: 1.82;
  color: rgba(243, 233, 210, 0.78);
}

.page-about .about-sources__num {
  margin: 0 !important;
  font-size: 12px !important;
  letter-spacing: 0.18em;
  color: var(--ke-cyan) !important;
}

.page-about .about-sources__link {
  display: inline-block;
  font-size: 13.5px;
  font-weight: 700;
  color: var(--ke-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 240, 208, 0.45);
  padding-bottom: 2px;
  transition: color 0.2s var(--ke-ease), border-color 0.2s var(--ke-ease);
}

.page-about .about-sources__link:hover,
.page-about .about-sources__link:focus-visible {
  color: var(--ke-cream);
  border-color: var(--ke-cream);
}

/* ============ 覆盖数据 ============ */
.page-about .about-reach__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-reach__card {
  padding: 20px 16px 18px;
  border: 1px solid var(--ke-line);
  border-radius: var(--about-card-radius);
  background: rgba(21, 27, 66, 0.55);
}

.page-about .about-reach__num {
  margin: 0;
  font-family: var(--ke-font-mono);
  font-size: clamp(30px, 8vw, 44px);
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--ke-orange);
  transition: transform 0.26s var(--ke-ease);
  transform-origin: left bottom;
}

.page-about .about-reach__num span {
  font-size: 0.5em;
  margin-left: 2px;
  color: var(--ke-gold);
}

.page-about .about-reach__card:hover .about-reach__num {
  transform: scale(1.07);
}

.page-about .about-reach__label {
  margin: 10px 0 6px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ke-cream);
}

.page-about .about-reach__note {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.65;
  color: rgba(243, 233, 210, 0.6);
}

.page-about .about-reach__strip {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
  margin-top: 22px;
  padding: 20px;
  border-radius: var(--about-card-radius);
  border: 1px dashed var(--ke-line);
  background: rgba(11, 16, 48, 0.55);
}

.page-about .about-reach__strip p {
  margin: 0;
  max-width: 36em;
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(243, 233, 210, 0.76);
}

/* ============ 收尾 CTA ============ */
.page-about .about-cta {
  padding: 56px 0 72px;
}

.page-about .about-cta__panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  padding: 30px 22px;
  border-radius: var(--ke-radius-lg);
  border: 1px solid rgba(79, 240, 208, 0.32);
  background:
    radial-gradient(90% 120% at 92% 0%, rgba(79, 240, 208, 0.14), transparent 60%),
    linear-gradient(160deg, rgba(21, 27, 66, 0.95), rgba(11, 16, 48, 0.8));
}

.page-about .about-cta__panel .ke-h2 {
  margin: 10px 0 0;
  font-size: clamp(23px, 4.4vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 900;
  text-wrap: balance;
}

.page-about .about-cta__text {
  margin: 14px 0 0;
  max-width: 34em;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(243, 233, 210, 0.76);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ============ 进场动画 ============ */
@keyframes about-rise {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-about [data-reveal] {
  animation: about-rise 0.55s var(--ke-ease) both;
  animation-delay: var(--ke-delay, 0ms);
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    animation: none;
  }
  .page-about .about-reach__card:hover .about-reach__num {
    transform: none;
  }
}

/* ============ 中等屏 ============ */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding: 104px 0 58px;
  }
  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-reach__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-reach__strip {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
  .page-about .about-cta__panel {
    align-items: center;
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

/* ============ 桌面 ============ */
@media (min-width: 940px) {
  .page-about .about-hero {
    padding: 128px 0 64px;
  }
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 56px;
  }
  .page-about .about-hero__trace {
    padding: 24px 22px 18px;
  }
  .page-about .about-section {
    padding: 82px 0 16px;
  }
  .page-about .about-section__head {
    margin-bottom: 40px;
  }
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 52px;
    align-items: start;
  }
  .page-about .about-timeline {
    max-width: 760px;
  }
  .page-about .about-team__grid {
    gap: 20px;
    padding-bottom: 24px;
  }
  .page-about .about-team__card:nth-child(2) {
    transform: translateY(24px);
  }
  .page-about .about-team__card:nth-child(4) {
    transform: translateY(24px);
  }
  .page-about .about-method {
    padding: 48px 46px 42px;
  }
  .page-about .about-method__list {
    margin-top: 34px;
  }
  .page-about .about-sources__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 22px;
  }
  .page-about .about-sources__col {
    padding: 30px 26px;
  }
  .page-about .about-reach__grid {
    gap: 16px;
  }
  .page-about .about-reach__card:nth-child(2) {
    margin-top: 26px;
  }
  .page-about .about-reach__card:nth-child(4) {
    margin-top: 12px;
  }
  .page-about .about-cta {
    padding: 72px 0 92px;
  }
  .page-about .about-cta__panel {
    padding: 44px 44px;
  }
}

.page-about {
  --ke-delay: var(--ke-shell);
}