.page-about {
  --about-contour: rgba(56, 214, 255, 0.07);
  --about-shadow: 0 20px 50px rgba(6, 26, 47, 0.45);
  display: block;
  background: var(--ink);
  color: var(--silver);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--sans);
  color: var(--ice);
  letter-spacing: -0.015em;
}

.page-about p {
  margin: 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 4vw, 36px) 0 clamp(44px, 7vw, 84px);
  background:
    repeating-radial-gradient(circle at 88% 12%, var(--about-contour) 0 1px, transparent 1px 34px),
    radial-gradient(circle at 82% 0%, rgba(184, 255, 60, 0.14), transparent 58%),
    linear-gradient(160deg, #061a2f 0%, #0a2440 62%, #061a2f 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 3px;
  background: linear-gradient(90deg, var(--lime), var(--cyan) 55%, var(--signal));
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
  margin-top: clamp(22px, 4vw, 40px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(30px, 6.4vw, 66px);
  line-height: 1.1;
  font-weight: 900;
  max-width: 19em;
}

.page-about .about-hero__lead {
  margin-top: clamp(16px, 2.4vw, 26px);
  max-width: 44em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--silver);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-hero__aside {
  position: relative;
  padding: 22px 20px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(13, 43, 74, 0.92), rgba(6, 26, 47, 0.7));
  box-shadow: var(--about-shadow);
}

.page-about .about-hero__note {
  position: absolute;
  top: 10px;
  right: -14px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--lime);
}

.page-about .about-hero__stats {
  display: grid;
  gap: 18px;
  margin: 22px 0 0;
}

.page-about .about-hero__stats .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--line);
}

.page-about .about-hero__stats .stat:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-hero__stats .stat__label {
  order: 2;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--rock);
}

.page-about .about-hero__stats .stat__value {
  order: 1;
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 800;
  line-height: 1;
  color: var(--lime);
  letter-spacing: -0.02em;
}

.page-about .about-unit {
  margin-left: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--silver);
  letter-spacing: 0;
}

/* ---------- 导读索引带 ---------- */
.page-about .about-index {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
}

.page-about .about-index__inner {
  display: flex;
  align-items: center;
  gap: 18px;
  padding-top: 14px;
  padding-bottom: 14px;
}

.page-about .about-index__label {
  flex: none;
  font-size: 11px;
  letter-spacing: 0.26em;
  color: var(--signal);
}

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

.page-about .about-index__list a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--silver);
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  border-color: var(--lime);
  color: var(--ink);
  background: var(--lime);
}

.page-about .about-index__num {
  font-size: 11px;
  color: var(--lime);
}

.page-about .about-index__list a:hover .about-index__num,
.page-about .about-index__list a:focus-visible .about-index__num {
  color: var(--ink);
}

/* ---------- 品牌起点 ---------- */
.page-about .about-origin {
  padding: clamp(46px, 7vw, 92px) 0;
  background: var(--ice);
  color: var(--coal);
}

.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 54px);
  align-items: start;
}

.page-about .about-origin__media {
  border: 1px solid rgba(10, 17, 24, 0.1);
  box-shadow: 0 24px 48px rgba(6, 26, 47, 0.18);
}

.page-about .about-origin__caption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: #5c6b7a;
}

.page-about .about-origin h2 {
  margin: 12px 0 0;
  font-size: clamp(24px, 3.6vw, 42px);
  line-height: 1.2;
  color: var(--coal);
}

.page-about .about-origin__copy p:not(.eyebrow) {
  margin-top: 16px;
  font-size: 15.5px;
  line-height: 1.82;
  color: #24313d;
}

.page-about .about-origin .eyebrow {
  color: #8a5200;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  padding: clamp(46px, 7vw, 92px) 0;
  background:
    radial-gradient(circle at 0% 40%, rgba(56, 214, 255, 0.1), transparent 46%),
    linear-gradient(180deg, #061a2f, #082036 70%, #061a2f);
}

.page-about .about-timeline__intro {
  margin-top: 12px;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--silver);
}

.page-about .about-timeline .section-head h2 {
  margin: 10px 0 0;
  font-size: clamp(24px, 3.6vw, 42px);
  line-height: 1.2;
}

.page-about .tl {
  position: relative;
  display: grid;
  gap: clamp(16px, 2.6vw, 26px);
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 15px;
  width: 2px;
  background: linear-gradient(180deg, var(--lime), var(--cyan) 48%, rgba(201, 215, 228, 0.12));
  border-radius: 2px;
}

.page-about .tl__item {
  position: relative;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
}

.page-about .tl__rail {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding-top: 16px;
}

.page-about .tl__year {
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--lime);
  writing-mode: horizontal-tb;
}

.page-about .tl__dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--lime);
  box-shadow: 0 0 0 4px rgba(184, 255, 60, 0.12);
}

.page-about .tl__card {
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: linear-gradient(145deg, rgba(13, 43, 74, 0.94), rgba(6, 26, 47, 0.86));
  overflow: hidden;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .tl__card:hover {
  border-color: var(--line-strong);
}

.page-about .tl__card[open] {
  border-color: rgba(184, 255, 60, 0.5);
}

.page-about .tl__card summary {
  display: grid;
  gap: 7px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
}

.page-about .tl__card summary::-webkit-details-marker {
  display: none;
}

.page-about .tl__card summary::marker {
  content: "";
}

.page-about .tl__card summary h3 {
  margin: 0;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 800;
  line-height: 1.35;
}

.page-about .tl__card summary p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--silver);
}

.page-about .tl__card summary .tag {
  justify-self: start;
}

.page-about .tl__card[open] summary h3 {
  color: var(--lime);
}

.page-about .tl__body {
  padding: 0 20px 20px;
  border-top: 1px solid var(--line);
  margin-top: 2px;
  padding-top: 16px;
}

.page-about .tl__body p {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--silver);
}

/* ---------- 数据实验室 ---------- */
.page-about .about-lab {
  padding: clamp(46px, 7vw, 92px) 0;
  background: var(--panel);
}

.page-about .about-lab__head h2 {
  margin: 10px 0 0;
  font-size: clamp(24px, 3.6vw, 42px);
  line-height: 1.2;
}

.page-about .about-lab__head > p:last-child {
  margin-top: 14px;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--silver);
}

.page-about .about-lab__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-lab__media {
  border: 1px solid var(--line);
}

.page-about .about-lab__caption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--rock);
}

.page-about .about-roles {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-roles__item {
  position: relative;
  padding: 18px 18px 18px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  background: rgba(6, 26, 47, 0.55);
  transition: border-left-color 0.3s var(--ease), background 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-roles__item:hover,
.page-about .about-roles__item:focus-within {
  border-left-color: var(--lime);
  background: rgba(6, 26, 47, 0.82);
  transform: translateX(4px);
}

.page-about .about-roles__num {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-about .about-roles__item h3 {
  margin: 6px 0 0;
  font-size: 18px;
  font-weight: 800;
}

.page-about .about-roles__item p {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--silver);
}

.page-about .about-roles__link {
  color: var(--rock) !important;
  border-top: 1px dashed var(--line);
  padding-top: 9px;
  transition: color 0.3s var(--ease);
}

.page-about .about-roles__item:hover .about-roles__link,
.page-about .about-roles__item:focus-within .about-roles__link {
  color: var(--cyan) !important;
}

/* ---------- 工作方法 ---------- */
.page-about .about-practice {
  padding: clamp(46px, 7vw, 92px) 0;
  background: var(--mint);
  color: var(--coal);
}

.page-about .about-practice__head h2 {
  margin: 10px 0 0;
  font-size: clamp(24px, 3.6vw, 42px);
  line-height: 1.2;
  color: var(--coal);
}

.page-about .about-practice__head > p:last-child {
  margin-top: 12px;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.75;
  color: #2b3a20;
}

.page-about .about-practice .eyebrow {
  color: #3d5a12;
}

.page-about .practice-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .practice {
  position: relative;
  padding: 22px 20px;
  border-radius: var(--radius-md) var(--radius-lg) var(--radius-md) var(--radius-lg);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(10, 17, 24, 0.1);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .practice:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 34px rgba(6, 26, 47, 0.16);
}

.page-about .practice__num {
  position: absolute;
  top: 16px;
  right: 18px;
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: rgba(10, 17, 24, 0.14);
}

.page-about .practice h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 800;
  color: var(--coal);
  padding-right: 34px;
}

.page-about .practice p {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.78;
  color: #2b3a20;
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  padding: clamp(46px, 7vw, 92px) 0;
  background:
    radial-gradient(circle at 100% 0%, rgba(184, 255, 60, 0.1), transparent 52%),
    var(--ink);
}

.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-about .about-eco__copy h2 {
  margin: 10px 0 0;
  font-size: clamp(24px, 3.6vw, 42px);
  line-height: 1.2;
}

.page-about .about-eco__copy p {
  margin-top: 16px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver);
}

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

.page-about .eco-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .eco-facts__item {
  padding: 16px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(13, 43, 74, 0.7);
}

.page-about .eco-facts__num {
  display: block;
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  line-height: 1;
  color: var(--lime);
  letter-spacing: -0.02em;
}

.page-about .eco-facts__text {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--silver);
}

/* ---------- 品牌视觉 ---------- */
.page-about .about-visual {
  padding: clamp(46px, 7vw, 92px) 0;
  background: linear-gradient(200deg, #0d2b4a, #061a2f 70%);
}

.page-about .about-visual__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
}

.page-about .about-visual__copy h2 {
  margin: 10px 0 0;
  font-size: clamp(24px, 3.6vw, 42px);
  line-height: 1.2;
}

.page-about .about-visual__copy p {
  margin-top: 16px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--silver);
}

.page-about .about-visual__media {
  border: 1px solid var(--line-strong);
}

.page-about .about-visual__caption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  padding: clamp(40px, 6vw, 76px) 0 clamp(52px, 7vw, 96px);
  background: var(--ink);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  align-items: center;
  padding: clamp(24px, 4vw, 40px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(184, 255, 60, 0.34);
  background:
    linear-gradient(120deg, rgba(184, 255, 60, 0.12), rgba(56, 214, 255, 0.06) 60%, transparent),
    var(--panel);
}

.page-about .about-cta__inner h2 {
  margin: 0;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.25;
}

.page-about .about-cta__inner p {
  margin-top: 12px;
  max-width: 42em;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--silver);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: clamp(30px, 4vw, 56px);
  }

  .page-about .about-origin__figure {
    position: sticky;
    top: 96px;
  }

  .page-about .about-lab__grid {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    align-items: start;
  }

  .page-about .about-lab__figure {
    position: sticky;
    top: 96px;
  }

  .page-about .practice-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: clamp(30px, 4vw, 56px);
  }

  .page-about .about-visual__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(30px, 4vw, 56px);
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 28px;
  }
}

@media (min-width: 980px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) 280px;
    align-items: end;
  }

  .page-about .tl {
    gap: clamp(18px, 2.2vw, 28px);
  }

  .page-about .tl__item {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: 20px;
  }

  .page-about .tl::before {
    left: 63px;
  }

  .page-about .tl__rail {
    flex-direction: row;
    justify-content: flex-end;
    align-items: center;
    gap: 14px;
    padding-top: 26px;
  }

  .page-about .tl__year {
    order: 1;
    font-size: 13px;
    letter-spacing: 0.06em;
  }

  .page-about .tl__dot {
    order: 2;
  }

  /* 沿等高线起伏：交替偏移 */
  .page-about .tl__item:nth-child(even) {
    transform: translateX(clamp(0px, 2.2vw, 30px));
  }

  .page-about .tl__item:nth-child(odd) .tl__card {
    margin-right: clamp(0px, 2vw, 26px);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__item:nth-child(even),
  .page-about .about-roles__item:hover,
  .page-about .practice:hover {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>
<<<END>>>