.page-about {
  --about-rail: 132px;
  --about-gap: clamp(24px, 3.6vw, 56px);
  --about-ink-soft: rgba(245, 242, 234, .78);
  background: var(--navy);
  color: var(--ink);
}

.page-about .kb-wrap {
  width: 100%;
  max-width: var(--wide);
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

.page-about .kb-panel {
  padding-block: clamp(52px, 6.6vw, 100px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-top: calc(var(--head-h) + clamp(46px, 7vw, 96px));
  padding-bottom: clamp(52px, 7vw, 96px);
  background:
    radial-gradient(110% 80% at 92% 4%, rgba(200, 162, 39, .22), transparent 60%),
    radial-gradient(80% 70% at 0% 100%, rgba(255, 107, 44, .14), transparent 62%),
    linear-gradient(158deg, #0B1B33 0%, #16304F 58%, #0B1B33 100%);
  color: var(--paper);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto -12% -58% 42%;
  height: 62%;
  background: radial-gradient(closest-side, rgba(63, 191, 160, .18), transparent 72%);
  z-index: -1;
  pointer-events: none;
}

.page-about .about-hero .kb-crumbs {
  color: rgba(245, 242, 234, .6);
}

.page-about .about-hero .kb-crumbs a {
  color: var(--gold-lt);
}

.page-about .about-hero__kicker {
  margin-top: clamp(26px, 4vw, 46px);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .3em;
  text-transform: uppercase;
}

.page-about .about-hero .kb-h1 {
  margin: 16px 0 0;
  max-width: 20ch;
  color: var(--paper);
  font-size: clamp(29px, 5.2vw, 56px);
  line-height: 1.16;
  letter-spacing: -.01em;
}

.page-about .about-hero__lede {
  margin-top: 22px;
  max-width: 40em;
  color: var(--about-ink-soft);
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.85;
}

.page-about .about-hero__metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: clamp(36px, 5vw, 58px);
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.page-about .about-metric {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-metric__value {
  display: inline-block;
  color: var(--gold-lt);
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.6vw, 46px);
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.page-about .about-metric__unit {
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  margin-top: -4px;
}

.page-about .about-metric__label {
  color: rgba(245, 242, 234, .62);
  font-size: 12px;
  letter-spacing: .16em;
}

/* ---------- 编号章节骨架 ---------- */
.page-about .kb-chapter {
  display: block;
}

.page-about .kb-rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 20px;
}

.page-about .kb-rail__num {
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 38px);
  font-weight: 700;
  line-height: 1;
}

.page-about .kb-rail__note {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .24em;
}

.page-about .kb-chapter__title {
  margin: 0 0 18px;
  font-size: clamp(22px, 3.2vw, 36px);
  line-height: 1.28;
  letter-spacing: -.005em;
}

.page-about .kb-prose {
  margin: 0 0 16px;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.85;
}

/* 深色面板内的文字与分割线 */
.page-about .kb-panel--deep,
.page-about .kb-panel--teal,
.page-about .kb-panel--wine,
.page-about .kb-panel--navy2 {
  color: var(--paper);
}

.page-about .kb-panel--deep .kb-rail__note,
.page-about .kb-panel--teal .kb-rail__note,
.page-about .kb-panel--wine .kb-rail__note,
.page-about .kb-panel--navy2 .kb-rail__note {
  color: rgba(245, 242, 234, .58);
}

.page-about .kb-panel--deep .kb-prose,
.page-about .kb-panel--teal .kb-prose,
.page-about .kb-panel--wine .kb-prose {
  color: var(--about-ink-soft);
}

/* ---------- 01 客户与业务 ---------- */
.page-about .about-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: clamp(26px, 3.4vw, 40px);
}

.page-about .about-card {
  position: relative;
  padding: 24px 22px 22px;
  background: #FFFFFF;
  border: 1px solid rgba(200, 162, 39, .34);
  border-left: 2px solid var(--gold);
  border-radius: var(--r);
  box-shadow: 0 1px 0 rgba(124, 138, 160, .18);
  transition: border-color .24s var(--ease), box-shadow .24s var(--ease);
}

.page-about .about-card:hover {
  border-color: rgba(200, 162, 39, .7);
  box-shadow: 0 6px 20px rgba(11, 27, 51, .1);
}

.page-about .about-card__title {
  margin: 0 0 12px;
  font-size: 19px;
  line-height: 1.4;
}

.page-about .about-card__text {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--soft);
}

.page-about .about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .kb-tag {
  display: inline-block;
  padding: 4px 10px;
  border: 1px solid rgba(200, 162, 39, .45);
  border-radius: 999px;
  color: #8A6C10;
  font-size: 12px;
  letter-spacing: .06em;
  line-height: 1.5;
}

.page-about .about-tags--light .kb-tag {
  border-color: rgba(231, 204, 106, .48);
  color: var(--gold-lt);
}

/* ---------- 02 产品线 ---------- */
.page-about .about-band {
  margin: 0 0 clamp(34px, 5vw, 64px);
}

.page-about .about-band .kb-media__frame {
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
  background: linear-gradient(150deg, #0B1B33 0%, #16304F 70%);
}

.page-about .about-band img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-band .kb-caption {
  margin-top: 12px;
  color: rgba(245, 242, 234, .56);
  font-size: 12px;
  letter-spacing: .08em;
}

.page-about .about-series {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: clamp(24px, 3.4vw, 40px);
}

.page-about .about-series__item {
  position: relative;
  padding: 22px 20px;
  background: linear-gradient(160deg, rgba(22, 48, 79, .95), rgba(11, 27, 51, .95));
  border: 1px solid rgba(200, 162, 39, .28);
  border-radius: var(--r);
  transition: border-color .24s var(--ease), transform .24s var(--ease);
}

.page-about .about-series__item:hover {
  border-color: rgba(231, 204, 106, .62);
  transform: translateY(-3px);
}

.page-about .about-series__no {
  display: block;
  color: var(--gold-lt);
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.page-about .about-series__title {
  margin: 12px 0 10px;
  color: var(--paper);
  font-size: 18px;
}

.page-about .about-series__text {
  margin: 0 0 14px;
  color: rgba(245, 242, 234, .74);
  font-size: 14px;
  line-height: 1.78;
}

.page-about .about-series__scene {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid rgba(200, 162, 39, .24);
  color: var(--mint);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
}

/* ---------- 03 产能 ---------- */
.page-about .about-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(26px, 3.6vw, 42px);
  background: rgba(245, 242, 234, .16);
  border: 1px solid rgba(245, 242, 234, .16);
  border-radius: var(--r);
  overflow: hidden;
}

.page-about .about-strip__cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px;
  background: rgba(11, 27, 51, .35);
}

.page-about .about-strip__num {
  color: var(--gold-lt);
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 36px);
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.page-about .about-strip__label {
  color: rgba(245, 242, 234, .66);
  font-size: 12px;
  letter-spacing: .14em;
}

.page-about .about-follow {
  margin-top: 24px;
  padding-left: 16px;
  border-left: 2px solid var(--orange);
  color: var(--about-ink-soft);
}

/* ---------- 04 / 06 图文分栏 ---------- */
.page-about .about-section--deep-teal {
  background-image: linear-gradient(180deg, rgba(11, 27, 51, .34), rgba(11, 27, 51, 0));
}

.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.4vw, 44px);
  align-items: start;
}

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

.page-about .about-split__media .kb-media__frame {
  border: 1px solid rgba(231, 204, 106, .34);
  border-radius: var(--r);
  overflow: hidden;
  background: linear-gradient(150deg, #0B1B33 0%, #16304F 70%);
}

.page-about .about-split__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-split__media .kb-caption {
  margin-top: 10px;
  color: rgba(245, 242, 234, .54);
  font-size: 12px;
  letter-spacing: .08em;
}

/* ---------- 05 资质 ---------- */
.page-about .about-cert {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(24px, 3.4vw, 38px);
}

.page-about .about-cert__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 18px 20px;
  border: 1px solid rgba(231, 204, 106, .3);
  border-radius: var(--r);
  background: rgba(11, 27, 51, .3);
}

.page-about .about-cert__mark {
  color: var(--gold-lt);
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .04em;
}

.page-about .about-cert__desc {
  color: rgba(245, 242, 234, .76);
  font-size: 14px;
  line-height: 1.75;
}

/* ---------- 07 阶段 ---------- */
.page-about .about-phases {
  position: relative;
  margin-top: clamp(24px, 3.4vw, 38px);
  padding-left: 20px;
}

.page-about .about-phases::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 14px;
  left: 5px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold), rgba(200, 162, 39, .12));
}

.page-about .about-phase {
  position: relative;
  margin-bottom: 12px;
  border: 1px solid rgba(200, 162, 39, .3);
  border-radius: var(--r);
  background: #FFFFFF;
  overflow: hidden;
}

.page-about .about-phase::before {
  content: "";
  position: absolute;
  top: 26px;
  left: -20px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(200, 162, 39, .18);
}

.page-about .about-phase .kb-fold__head {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 18px 18px;
  border: 0;
  background: transparent;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
  font-family: inherit;
}

.page-about .about-phase__no {
  flex: none;
  color: #8A6C10;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
}

.page-about .about-phase__title {
  flex: 1 1 auto;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .about-phase__x {
  flex: none;
  color: var(--gold);
  font-size: 18px;
  line-height: 1;
  transition: transform .24s var(--ease);
}

.page-about .about-phase[data-open] .about-phase__x {
  transform: rotate(45deg);
}

.page-about .about-phase .kb-fold__body {
  padding: 0 18px 18px;
}

.page-about .about-phase .kb-prose {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid rgba(124, 138, 160, .28);
  color: var(--soft);
  font-size: 15px;
}

/* ---------- 下一步 ---------- */
.page-about .about-next__title {
  margin: 0 0 14px;
  color: var(--paper);
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.3;
}

.page-about .about-next__lede {
  margin: 0;
  color: var(--about-ink-soft);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .about-next__links {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(26px, 3.6vw, 42px);
}

.page-about .about-next__card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px;
  border: 1px solid rgba(200, 162, 39, .34);
  border-radius: var(--r);
  background: rgba(11, 27, 51, .42);
  text-decoration: none;
  transition: border-color .24s var(--ease), background-color .24s var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  border-color: var(--gold-lt);
  background: rgba(200, 162, 39, .1);
}

.page-about .about-next__card-t {
  color: var(--gold-lt);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .04em;
}

.page-about .about-next__card-d {
  color: rgba(245, 242, 234, .72);
  font-size: 13px;
  line-height: 1.72;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero__metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 960px) {
  .page-about .kb-chapter {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about .kb-rail {
    position: sticky;
    top: calc(var(--head-h) + 30px);
    display: block;
    margin-bottom: 0;
    padding-right: 4px;
  }

  .page-about .kb-rail__num {
    display: block;
    font-size: 54px;
  }

  .page-about .kb-rail__note {
    display: block;
    margin-top: 18px;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: .3em;
    font-size: 11px;
    line-height: 1;
    white-space: nowrap;
  }

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

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

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

  .page-about .about-split--reverse .about-split__media {
    order: 2;
  }

  .page-about .about-split--reverse .about-split__body {
    order: 1;
  }
}

@media (min-width: 1180px) {
  .page-about .about-chapter--media {
    margin-top: -18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .kb-reveal,
  .page-about .about-card,
  .page-about .about-series__item,
  .page-about .about-next__card,
  .page-about .about-phase__x {
    transition: none !important;
    transform: none !important;
    animation: none !important;
  }
}