/* ===== 品牌价值页 · page-about ===== */
.page-about {
  --about-cut: 20px;
  --about-body: rgba(244, 240, 230, .8);
  --about-body-dim: rgba(244, 240, 230, .6);
  --about-card: rgba(18, 61, 46, .42);
  background: var(--lb-night);
  color: var(--lb-rice);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(1.5rem, 3.5vw, 2.5rem) 0 clamp(2rem, 5vw, 3.25rem);
  background:
    radial-gradient(115% 85% at 8% -12%, rgba(46, 242, 210, .2), transparent 58%),
    radial-gradient(85% 70% at 96% 4%, rgba(255, 122, 26, .14), transparent 60%),
    linear-gradient(176deg, var(--lb-night) 0%, var(--lb-pitch) 70%, var(--lb-night) 100%);
  border-bottom: 1px solid var(--lb-line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--lb-cyan), rgba(46, 242, 210, 0) 42%, rgba(255, 122, 26, 0) 58%, var(--lb-orange));
  opacity: .65;
}

.page-about .about-crumbs {
  margin-bottom: clamp(1.1rem, 2.6vw, 1.9rem);
}

.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  margin: 0;
  font-family: var(--lb-font-mono);
  font-size: .74rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--lb-cyan);
}

.page-about .about-hero__eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--lb-orange);
}

.page-about .about-hero__title {
  margin: clamp(.55rem, 1.4vw, .95rem) 0 clamp(.7rem, 1.8vw, 1.1rem);
  font-family: var(--lb-font-display);
  font-weight: 900;
  font-size: clamp(1.95rem, 6.4vw, 4.15rem);
  line-height: 1.06;
  letter-spacing: -.02em;
  max-width: 18ch;
}

.page-about .about-hero__lede {
  max-width: 60ch;
  margin: 0;
  font-size: clamp(1rem, 1.6vw, 1.1rem);
  line-height: 1.78;
  color: var(--about-body);
}

/* ---------- 首屏数字 ---------- */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(1.6rem, 4vw, 2.6rem);
  background: var(--lb-line);
  border: 1px solid var(--lb-line);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}

.page-about .about-metric {
  display: grid;
  align-content: start;
  gap: .35rem;
  padding: clamp(.9rem, 2.4vw, 1.4rem);
  background: rgba(11, 31, 23, .9);
}

.page-about .about-metric__value {
  font-family: var(--lb-font-mono);
  font-weight: 700;
  font-size: clamp(1.35rem, 4vw, 2.15rem);
  line-height: 1;
  color: var(--lb-cyan);
}

.page-about .about-metric__label {
  font-size: .95rem;
  font-weight: 500;
  color: var(--lb-rice);
}

.page-about .about-metric__meta {
  font-size: .78rem;
  line-height: 1.5;
  color: var(--lb-cyan-gray);
}

/* ---------- 主体两栏布局 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
  padding-top: clamp(1.75rem, 4.5vw, 3rem);
  padding-bottom: clamp(2.5rem, 6vw, 4.5rem);
}

/* ---------- 左侧目录 ---------- */
.page-about .about-index {
  border-top: 2px solid var(--lb-line-strong);
  padding-top: .9rem;
}

.page-about .about-index__title {
  margin: 0 0 .7rem;
  font-family: var(--lb-font-mono);
  font-size: .72rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--lb-cyan-gray);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .15rem;
}

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

.page-about .about-index__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .6rem;
  align-items: baseline;
  padding: .5rem .55rem;
  border-left: 2px solid transparent;
  color: var(--lb-rice);
  text-decoration: none;
  font-size: .9rem;
  line-height: 1.45;
  transition: background-color .22s ease, border-color .22s ease, color .22s ease;
}

.page-about .about-index__num {
  font-family: var(--lb-font-mono);
  font-size: .72rem;
  color: var(--lb-cyan-gray);
  transition: color .22s ease;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-left-color: var(--lb-orange);
  background: var(--about-card);
  color: var(--lb-cyan);
}

.page-about .about-index__link:hover .about-index__num,
.page-about .about-index__link:focus-visible .about-index__num {
  color: var(--lb-orange);
}

/* ---------- 内容流 ---------- */
.page-about .about-flow {
  min-width: 0;
}

.page-about .about-block {
  padding-block: clamp(1.5rem, 3.6vw, 2.4rem);
  border-top: 1px solid var(--lb-line-soft);
}

.page-about .about-block:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-block__tag {
  display: inline-block;
  margin: 0 0 .55rem;
  font-family: var(--lb-font-mono);
  font-size: .72rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--lb-orange);
}

.page-about .about-block__title {
  margin: 0 0 .85rem;
  font-family: var(--lb-font-display);
  font-weight: 800;
  font-size: clamp(1.35rem, 3.4vw, 2.05rem);
  line-height: 1.18;
  letter-spacing: -.015em;
  max-width: 22ch;
}

.page-about .about-block__intro {
  margin: 0 0 1.1rem;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--about-body);
}

.page-about .about-split__text p {
  margin: 0 0 .9rem;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--about-body);
}

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

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.1rem, 3vw, 1.9rem);
}

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--lb-pitch);
  border: 1px solid var(--lb-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-figure__cap {
  margin-top: .6rem;
  font-size: .8rem;
  line-height: 1.65;
  color: var(--lb-cyan-gray);
}

.page-about .about-figure--flow {
  margin-top: clamp(1.2rem, 3vw, 1.9rem);
}

/* ---------- 校验步骤 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 1.1rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--lb-line);
  border: 1px solid var(--lb-line);
}

.page-about .about-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .2rem .85rem;
  align-items: baseline;
  padding: clamp(.85rem, 2vw, 1.15rem);
  background: rgba(11, 31, 23, .86);
}

.page-about .about-step__num {
  grid-row: 1 / span 2;
  font-family: var(--lb-font-mono);
  font-size: .82rem;
  font-weight: 700;
  color: var(--lb-cyan);
}

.page-about .about-step__title {
  font-family: var(--lb-font-display);
  font-weight: 800;
  font-size: 1.02rem;
  color: var(--lb-rice);
}

.page-about .about-step__text {
  font-size: .9rem;
  line-height: 1.7;
  color: var(--about-body-dim);
}

/* ---------- 可视化卡片 ---------- */
.page-about .about-cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  margin-top: 1.1rem;
}

.page-about .about-card {
  padding: clamp(.95rem, 2.3vw, 1.35rem);
  background: linear-gradient(162deg, var(--lb-pitch), var(--lb-night));
  border: 1px solid var(--lb-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
  transition: border-color .22s ease, transform .22s ease;
}

.page-about .about-card:hover,
.page-about .about-card:focus-within {
  border-color: var(--lb-line-strong);
  transform: translateY(-2px);
}

.page-about .about-card__title {
  margin: 0 0 .5rem;
  font-family: var(--lb-font-display);
  font-weight: 800;
  font-size: 1.08rem;
  color: var(--lb-rice);
}

.page-about .about-card__text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.72;
  color: var(--about-body-dim);
}

.page-about .about-spark {
  display: grid;
  gap: 5px;
  margin-top: .95rem;
}

.page-about .about-spark__bar {
  display: block;
  width: var(--w, 50%);
  height: 6px;
  background: linear-gradient(90deg, var(--lb-cyan), rgba(46, 242, 210, .18));
  border-radius: 1px;
}

.page-about .about-spark__bar--alt {
  background: linear-gradient(90deg, var(--lb-orange), rgba(255, 122, 26, .18));
}

.page-about .about-note {
  display: grid;
  gap: .35rem;
  margin-top: 1.3rem;
  padding: .95rem 1.05rem;
  border-left: 3px solid var(--lb-clay);
  background: rgba(185, 106, 75, .1);
}

.page-about .about-note__label {
  font-family: var(--lb-font-mono);
  font-size: .7rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--lb-clay);
}

.page-about .about-note p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.72;
  color: var(--about-body);
}

/* ---------- 团队角色 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: 0 0 1.2rem;
  padding: 0;
  display: grid;
  gap: .7rem;
}

.page-about .about-role {
  display: grid;
  gap: .3rem;
  padding: .85rem 1rem;
  background: var(--about-card);
  border-left: 2px solid var(--lb-moss);
}

.page-about .about-role__name {
  font-family: var(--lb-font-display);
  font-weight: 800;
  font-size: 1rem;
  color: var(--lb-cyan);
}

.page-about .about-role__desc {
  font-size: .89rem;
  line-height: 1.72;
  color: var(--about-body-dim);
}

.page-about .about-partner {
  padding: 1rem 1.1rem;
  border: 1px dashed var(--lb-line-strong);
}

.page-about .about-partner__title {
  margin: 0 0 .5rem;
  font-family: var(--lb-font-display);
  font-weight: 800;
  font-size: 1.02rem;
  color: var(--lb-rice);
}

.page-about .about-partner p {
  margin: 0 0 .7rem;
  font-size: .89rem;
  line-height: 1.74;
  color: var(--about-body-dim);
}

.page-about .about-link {
  display: inline-block;
  font-family: var(--lb-font-mono);
  font-size: .84rem;
  color: var(--lb-orange);
  text-decoration: none;
  border-bottom: 1px solid var(--lb-line-orange);
  padding-bottom: 2px;
  transition: color .22s ease, border-color .22s ease;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--lb-cyan);
  border-color: var(--lb-line-strong);
}

/* ---------- 里程碑时间线 ---------- */
.page-about .about-miles {
  list-style: none;
  margin: 1.2rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.1rem;
}

.page-about .about-mile {
  position: relative;
  padding: .15rem 0 .15rem 1.6rem;
  border-left: 1px solid var(--lb-line);
  outline: none;
}

.page-about .about-mile::before {
  content: "";
  position: absolute;
  left: -5px;
  top: .55rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--lb-cyan);
  box-shadow: 0 0 0 3px rgba(46, 242, 210, .16);
  transition: background-color .22s ease, box-shadow .22s ease;
}

.page-about .about-mile:last-child::before {
  background: var(--lb-orange);
  box-shadow: 0 0 0 3px rgba(255, 122, 26, .18);
}

.page-about .about-mile:hover::before,
.page-about .about-mile:focus-within::before {
  background: var(--lb-orange);
  box-shadow: 0 0 0 4px rgba(255, 122, 26, .24);
}

.page-about .about-mile__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .3rem .7rem;
}

.page-about .about-mile__year {
  font-family: var(--lb-font-mono);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--lb-cyan);
}

.page-about .about-mile__title {
  margin: 0;
  font-family: var(--lb-font-display);
  font-weight: 800;
  font-size: 1.02rem;
  line-height: 1.35;
  color: var(--lb-rice);
}

.page-about .about-mile__text {
  margin: .35rem 0 0;
  font-size: .9rem;
  line-height: 1.72;
  color: var(--about-body);
}

.page-about .about-mile__more {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: .86rem;
  line-height: 1.72;
  color: var(--lb-cyan-gray);
  transition: max-height .3s ease, opacity .28s ease, margin-top .3s ease;
}

.page-about .about-mile:hover .about-mile__more,
.page-about .about-mile:focus-within .about-mile__more {
  max-height: 14rem;
  opacity: 1;
  margin-top: .5rem;
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  margin-top: clamp(1.6rem, 4vw, 2.6rem);
  padding: clamp(1.4rem, 3.4vw, 2.3rem);
  background: linear-gradient(138deg, var(--lb-pitch), var(--lb-night) 72%);
  border: 1px solid var(--lb-line-strong);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .about-cta__title {
  margin: 0 0 .6rem;
  font-family: var(--lb-font-display);
  font-weight: 800;
  font-size: clamp(1.25rem, 3vw, 1.8rem);
  line-height: 1.2;
  letter-spacing: -.015em;
  color: var(--lb-rice);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 56ch;
  font-size: .95rem;
  line-height: 1.75;
  color: var(--about-body);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.15rem;
}

/* ---------- 断点：宽屏 ---------- */
@media (min-width: 780px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: start;
  }

  .page-about .about-split--flip {
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  }

  .page-about .about-split--flip > .about-figure {
    order: 1;
  }

  .page-about .about-split--flip > .about-split__text {
    order: 2;
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: minmax(190px, 230px) minmax(0, 1fr);
    gap: clamp(2.4rem, 4.5vw, 4rem);
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--lb-header-h) + 1.5rem);
    align-self: start;
  }

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

  .page-about .about-hero__title {
    max-width: 16ch;
  }
}

/* ---------- 无障碍：减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-card,
  .page-about .about-index__link,
  .page-about .about-mile::before,
  .page-about .about-mile__more,
  .page-about .about-link {
    transition: none;
  }

  .page-about .about-card:hover,
  .page-about .about-card:focus-within {
    transform: none;
  }
}

.page-about {
  --w: 1rem;
}