.page-about {
  --about-gap: clamp(22px, 4vw, 40px);
  --about-pad: clamp(20px, 3.4vw, 36px);
  --about-glow: rgba(61, 255, 193, 0.14);
  --about-soft: rgba(11, 31, 26, 0.6);
  position: relative;
  background: var(--lb-bg);
  color: var(--lb-warm);
  font-family: var(--lb-font-body);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 4.5vw, 40px) 0 clamp(32px, 5.5vw, 60px);
  border-bottom: 1px solid var(--lb-line);
  background:
    radial-gradient(115% 85% at 88% -12%, var(--about-glow), transparent 62%),
    radial-gradient(85% 65% at -12% 18%, rgba(255, 122, 26, 0.09), transparent 60%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(to right, rgba(30, 74, 63, 0.32) 1px, transparent 1px);
  background-size: 72px 100%;
  opacity: 0.45;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  max-width: 20ch;
  font-family: var(--lb-font-display);
  font-weight: 800;
  font-size: clamp(34px, 7.4vw, 76px);
  line-height: 1.03;
  letter-spacing: 0.015em;
  color: var(--lb-white);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--lb-accent);
}

.page-about .about-hero__lead {
  margin: clamp(16px, 2.6vw, 26px) 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--lb-muted);
}

.page-about .about-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(18px, 3vw, 26px);
}

/* 章节索引 */
.page-about .about-body {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding-top: clamp(26px, 4.5vw, 52px);
}

.page-about .about-index {
  border-top: 1px solid var(--lb-line);
  border-bottom: 1px solid var(--lb-line);
  padding: 12px 0 10px;
}

.page-about .about-index__title {
  margin: 0 0 10px 4px;
  font-family: var(--lb-font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--lb-muted);
  text-transform: uppercase;
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 2px 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 15px;
  border: 1px solid var(--lb-line);
  border-radius: var(--lb-pill);
  font-size: 13px;
  line-height: 1.2;
  white-space: nowrap;
  color: var(--lb-muted);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-index__num {
  font-family: var(--lb-font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--lb-accent);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--lb-white);
  border-color: var(--lb-accent-dim);
  background: rgba(61, 255, 193, 0.08);
}

/* 章节面板 */
.page-about .about-chapters {
  display: grid;
  gap: var(--about-gap);
  min-width: 0;
}

.page-about .about-ch {
  position: relative;
  min-width: 0;
  padding: var(--about-pad);
  border: 1px solid var(--lb-line);
  border-radius: var(--lb-radius-l);
  background: linear-gradient(180deg, rgba(18, 48, 42, 0.94), rgba(10, 27, 23, 0.94));
  scroll-margin-top: calc(var(--lb-mast-h) + var(--lb-nav-h) + 20px);
}

.page-about .about-ch:nth-child(even) {
  background: linear-gradient(180deg, rgba(10, 27, 23, 0.96), rgba(18, 48, 42, 0.9));
}

.page-about .about-ch__num {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--lb-font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--lb-orange);
}

.page-about .about-ch__title {
  margin: 0;
  font-family: var(--lb-font-display);
  font-weight: 750;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.16;
  letter-spacing: 0.01em;
  color: var(--lb-white);
}

.page-about .about-copy p {
  margin: 14px 0 0;
  font-size: clamp(14.5px, 1.5vw, 16px);
  line-height: 1.86;
  color: var(--lb-muted);
}

.page-about .about-split {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
  margin-top: 6px;
}

/* 图片容器 */
.page-about .about-media {
  position: relative;
  margin: 20px 0 0;
  border: 1px solid var(--lb-line);
  border-radius: var(--lb-radius-m);
  overflow: hidden;
  background: var(--lb-panel-deep);
}

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

.page-about .about-media--wide img {
  aspect-ratio: 14 / 9;
}

.page-about .about-media--tall img {
  aspect-ratio: 4 / 3;
}

.page-about .about-media__cap {
  position: absolute;
  left: 12px;
  bottom: 12px;
  padding: 5px 11px;
  border: 1px solid var(--lb-line);
  border-radius: var(--lb-pill);
  background: rgba(11, 31, 26, 0.82);
  font-family: var(--lb-font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--lb-warm);
}

/* 数据条 */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 22px 0 0;
  border-radius: var(--lb-radius-m);
  overflow: hidden;
  background: var(--lb-line);
}

.page-about .about-stat {
  padding: 18px 16px 20px;
  background: var(--lb-panel-deep);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--lb-font-display);
  font-weight: 800;
  font-size: clamp(30px, 6vw, 48px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--lb-accent);
}

.page-about .about-stat--alt .about-stat__num {
  color: var(--lb-orange);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 9px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--lb-muted);
}

/* 流程 */
.page-about .about-flow {
  display: grid;
  gap: 14px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow__item {
  position: relative;
  padding: 16px 18px 18px 20px;
  border-left: 2px solid var(--lb-line);
  border-radius: 0 var(--lb-radius-m) var(--lb-radius-m) 0;
  background: var(--about-soft);
  transition: border-color 0.22s ease, background 0.22s ease;
}

.page-about .about-flow__item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 22px;
  width: 12px;
  height: 12px;
  background: var(--lb-bg);
  border: 2px solid var(--lb-accent-dim);
  transform: rotate(45deg);
}

.page-about .about-flow__item:hover {
  border-left-color: var(--lb-accent);
  background: rgba(61, 255, 193, 0.07);
}

.page-about .about-flow__num {
  display: block;
  font-family: var(--lb-font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--lb-mist);
}

.page-about .about-flow__title {
  margin: 8px 0 0;
  font-size: 17px;
  font-weight: 650;
  line-height: 1.3;
  color: var(--lb-white);
}

.page-about .about-flow__text {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--lb-muted);
}

/* 时间线 */
.page-about .about-tl {
  margin: 22px 0 0;
  padding: 0 0 0 22px;
  list-style: none;
  border-left: 2px solid var(--lb-line);
}

.page-about .about-tl__item {
  position: relative;
  padding: 0 0 26px;
}

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

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 4px;
  width: 12px;
  height: 12px;
  background: var(--lb-panel-deep);
  border: 2px solid var(--lb-accent);
  transform: rotate(45deg);
  transition: background 0.22s ease, box-shadow 0.22s ease;
}

.page-about .about-tl__item:hover::before {
  background: var(--lb-accent);
  box-shadow: 0 0 0 6px var(--about-glow);
}

.page-about .about-tl__year {
  display: inline-block;
  padding: 4px 13px;
  border-radius: 4px;
  background: var(--lb-accent);
  font-family: var(--lb-font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--lb-bg);
  transform: skewX(-8deg);
}

.page-about .about-tl__year > span {
  display: inline-block;
  transform: skewX(8deg);
}

.page-about .about-tl__item:nth-child(2n) .about-tl__year {
  background: var(--lb-orange);
  color: var(--lb-white);
}

.page-about .about-tl__title {
  margin: 10px 0 0;
  font-size: 17px;
  font-weight: 650;
  line-height: 1.3;
  color: var(--lb-white);
  transition: color 0.22s ease;
}

.page-about .about-tl__item:hover .about-tl__title {
  color: var(--lb-accent);
}

.page-about .about-tl__text {
  margin: 7px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--lb-muted);
}

/* 团队 */
.page-about .about-roles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-role {
  padding: 15px 16px 16px;
  border: 1px solid var(--lb-line);
  border-radius: var(--lb-radius-s);
  background: var(--about-soft);
}

.page-about .about-role__num {
  display: block;
  font-family: var(--lb-font-display);
  font-weight: 800;
  font-size: clamp(26px, 4.6vw, 34px);
  line-height: 1;
  color: var(--lb-accent);
}

.page-about .about-role:nth-child(3) .about-role__num {
  color: var(--lb-orange);
}

.page-about .about-role__label {
  display: block;
  margin-top: 8px;
  font-family: var(--lb-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--lb-muted);
}

/* 服务对象 */
.page-about .about-aud {
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-aud__item {
  display: grid;
  gap: 8px;
  padding: 20px 0;
  border-top: 1px solid var(--lb-line);
}

.page-about .about-aud__name {
  margin: 0;
  font-family: var(--lb-font-display);
  font-weight: 750;
  font-size: clamp(19px, 2.4vw, 23px);
  line-height: 1.25;
  letter-spacing: 0.01em;
  color: var(--lb-white);
}

.page-about .about-aud__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--lb-muted);
}

.page-about .about-link {
  color: var(--lb-accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 255, 193, 0.4);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--lb-white);
  border-bottom-color: var(--lb-white);
}

.page-about .about-aud__item .about-link {
  justify-self: start;
  font-family: var(--lb-font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
}

.page-about .about-inline-link {
  margin: 20px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--lb-muted);
}

.page-about .about-contactline {
  margin: 18px 0 0;
  padding: 14px 16px;
  border: 1px dashed var(--lb-line);
  border-radius: var(--lb-radius-s);
  font-size: 14px;
  line-height: 1.75;
  color: var(--lb-muted);
}

/* 收束区 */
.page-about .about-cta {
  position: relative;
  padding: clamp(24px, 4vw, 44px);
  border-radius: var(--lb-radius-l);
  border: 1px solid var(--lb-line);
  overflow: hidden;
  background:
    radial-gradient(90% 120% at 92% 0%, rgba(61, 255, 193, 0.18), transparent 58%),
    linear-gradient(160deg, rgba(18, 48, 42, 0.98), rgba(10, 27, 23, 0.98));
}

.page-about .about-cta__title {
  margin: 0;
  max-width: 22ch;
  font-family: var(--lb-font-display);
  font-weight: 800;
  font-size: clamp(24px, 4vw, 40px);
  line-height: 1.14;
  letter-spacing: 0.015em;
  color: var(--lb-white);
}

.page-about .about-cta__text {
  margin: 14px 0 0;
  max-width: 52ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--lb-muted);
}

.page-about .about-cta__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-toplink {
  display: inline-block;
  margin-top: 22px;
  font-family: var(--lb-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--lb-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-toplink:hover,
.page-about .about-toplink:focus-visible {
  color: var(--lb-accent);
  border-bottom-color: var(--lb-accent);
}

@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-aud__item {
    grid-template-columns: minmax(0, 210px) minmax(0, 1fr);
    align-items: start;
    column-gap: 20px;
  }

  .page-about .about-aud__item .about-link {
    grid-column: 2;
  }
}

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about .about-split--rev {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .about-media {
    margin-top: 22px;
  }
}

@media (min-width: 900px) {
  .page-about .about-body {
    grid-template-columns: minmax(180px, 250px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--lb-mast-h) + var(--lb-nav-h) + 18px);
    border-bottom: none;
    padding-bottom: 0;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
  }

  .page-about .about-index__link {
    width: 100%;
    border-color: transparent;
    border-radius: var(--lb-radius-s);
    border-left: 2px solid var(--lb-line);
    padding: 10px 12px;
    white-space: normal;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    border-left-color: var(--lb-accent);
    background: rgba(61, 255, 193, 0.07);
  }

  .page-about .about-ch:nth-child(even) {
    margin-left: clamp(0px, 1.6vw, 22px);
  }

  .page-about .about-hero__title {
    max-width: 18ch;
  }
}

@media (min-width: 1100px) {
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-cta__title {
    max-width: 24ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-flow__item,
  .page-about .about-tl__item::before,
  .page-about .about-tl__title,
  .page-about .about-link,
  .page-about .about-toplink {
    transition: none;
  }
}