.page-about {
  --ab-panel: rgba(18, 53, 43, 0.5);
  --ab-panel-soft: rgba(31, 90, 69, 0.24);
  --ab-body: rgba(244, 247, 245, 0.8);
  --ab-body-soft: rgba(244, 247, 245, 0.72);
  display: block;
  overflow-x: clip;
  color: var(--rb-white);
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  padding-block: clamp(20px, 4vw, 40px) clamp(34px, 6vw, 70px);
}

.page-about .ab-crumb {
  margin-bottom: clamp(14px, 2.6vw, 26px);
}

.page-about .ab-crumb ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.07em;
  color: var(--rb-slate);
}

.page-about .ab-crumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--rb-line-strong);
}

.page-about .ab-crumb a {
  color: var(--rb-slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.24s var(--rb-ease), border-color 0.24s var(--rb-ease);
}

.page-about .ab-crumb a:hover {
  color: var(--rb-cyan);
  border-bottom-color: var(--rb-cyan);
}

.page-about .ab-hero__frame {
  position: relative;
  isolation: isolate;
  border: 1px solid var(--rb-line-strong);
  padding: clamp(26px, 4.6vw, 56px) clamp(20px, 4.4vw, 58px) clamp(22px, 3.6vw, 40px);
  background:
    radial-gradient(120% 130% at 4% 0%, rgba(31, 90, 69, 0.5) 0%, rgba(18, 53, 43, 0.28) 42%, rgba(11, 18, 16, 0.9) 100%);
  overflow: hidden;
}

.page-about .ab-hero__frame::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--rb-grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--rb-grid) 1px, transparent 1px);
  background-size: 64px 64px;
}

.page-about .ab-hero__edge {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  z-index: 2;
  background: linear-gradient(180deg, var(--rb-red) 0 34%, var(--rb-yellow) 34% 67%, var(--rb-cyan) 67% 100%);
}

.page-about .ab-hero__note {
  display: none;
}

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

.page-about .ab-hero__title {
  margin: 10px 0 0;
  font-size: clamp(34px, 7.6vw, 68px);
  line-height: 1.05;
  letter-spacing: -0.025em;
  font-weight: 900;
}

.page-about .ab-hero__lead {
  margin: clamp(16px, 2.6vw, 26px) 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: var(--rb-body);
}

.page-about .ab-hero__actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3.4vw, 34px);
}

.page-about .ab-hero__stats {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--rb-line);
}

.page-about .ab-hero__stats li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--rb-line);
}

.page-about .ab-hero__num {
  font-family: var(--rb-font-num);
  font-size: clamp(26px, 4.4vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--rb-yellow);
  min-width: 3.4ch;
}

.page-about .ab-hero__lbl {
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--rb-slate);
}

/* ---------- 通用区块 ---------- */

.page-about .ab-sec {
  padding-block: clamp(34px, 6vw, 74px);
}

.page-about .ab-sec:first-of-type {
  border-top: 1px solid var(--rb-line);
}

.page-about .ab-h2 {
  margin: 10px 0 0;
  font-size: clamp(23px, 3.6vw, 38px);
  line-height: 1.24;
  letter-spacing: -0.018em;
  font-weight: 800;
}

.page-about .ab-p {
  margin: 14px 0 0;
  max-width: 70ch;
  font-size: 15px;
  line-height: 1.86;
  color: var(--ab-body);
}

.page-about .ab-intro {
  margin-top: clamp(12px, 2vw, 18px);
}

/* ---------- 图片 ---------- */

.page-about .ab-fig {
  margin: 0;
}

.page-about .ab-fig__frame {
  position: relative;
  border: 1px solid var(--rb-line);
  background: var(--rb-ink);
  overflow: hidden;
  aspect-ratio: 3 / 2;
  box-shadow: 0 18px 46px rgba(0, 0, 0, 0.45);
}

.page-about .ab-fig__frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .ab-fig__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.55;
  background-image:
    linear-gradient(to right, var(--rb-grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--rb-grid) 1px, transparent 1px);
  background-size: 32px 32px;
}

.page-about .ab-fig figcaption {
  margin-top: 10px;
  padding-left: 10px;
  border-left: 2px solid var(--rb-yellow);
  font-size: 12.5px;
  line-height: 1.65;
  letter-spacing: 0.04em;
  color: var(--rb-slate);
}

/* ---------- 起点与重心 ---------- */

.page-about .ab-origin__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .ab-list {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 12px 14px;
  border-left: 2px solid var(--rb-turf);
  background: var(--ab-panel-soft);
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ab-body);
}

.page-about .ab-list__num {
  font-family: var(--rb-font-num);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--rb-cyan);
}

/* ---------- 服务对象 ---------- */

.page-about .ab-personas__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2.4vw, 20px);
  margin-top: clamp(24px, 3.6vw, 38px);
}

.page-about .ab-persona {
  position: relative;
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--rb-line);
  border-top: 3px solid var(--rb-turf);
  background: linear-gradient(180deg, var(--ab-panel), rgba(11, 18, 16, 0.82));
}

.page-about .ab-persona--red {
  border-top-color: var(--rb-red);
}

.page-about .ab-persona--yellow {
  border-top-color: var(--rb-yellow);
}

.page-about .ab-persona--cyan {
  border-top-color: var(--rb-cyan);
}

.page-about .ab-persona__tag {
  display: inline-block;
  padding: 4px 9px;
  border: 1px solid var(--rb-line-strong);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--rb-slate);
}

.page-about .ab-persona--red .ab-persona__tag {
  border-color: rgba(226, 59, 46, 0.55);
  color: #f3a29a;
}

.page-about .ab-persona--yellow .ab-persona__tag {
  border-color: rgba(245, 197, 66, 0.55);
  color: var(--rb-yellow);
}

.page-about .ab-persona--cyan .ab-persona__tag {
  border-color: rgba(95, 211, 179, 0.5);
  color: var(--rb-cyan);
}

.page-about .ab-persona__title {
  margin: 14px 0 0;
  font-size: clamp(17px, 2.3vw, 21px);
  font-weight: 700;
  line-height: 1.4;
}

.page-about .ab-persona__text {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ab-body-soft);
}

.page-about .ab-persona__what {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--rb-line);
  font-size: 13px;
  color: var(--rb-mist);
}

.page-about .ab-persona__what span {
  display: inline-block;
  margin-right: 8px;
  font-family: var(--rb-font-num);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--rb-yellow);
}

/* ---------- 数据方法 ---------- */

.page-about .ab-method__head {
  display: grid;
  gap: 14px;
}

.page-about .ab-method__note {
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid var(--rb-red);
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--rb-slate);
}

.page-about .ab-steps {
  list-style: none;
  margin: clamp(24px, 3.8vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(10px, 1.6vw, 14px);
  counter-reset: ab-step;
}

.page-about .ab-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(12px, 2.4vw, 24px);
  align-items: start;
  padding: clamp(16px, 2.6vw, 24px);
  border: 1px solid var(--rb-line);
  border-left: 3px solid var(--rb-yellow);
  background: linear-gradient(180deg, rgba(18, 53, 43, 0.5), rgba(11, 18, 16, 0.66));
}

.page-about .ab-step:nth-child(1) {
  border-left-color: var(--rb-red);
}

.page-about .ab-step:nth-child(3) {
  border-left-color: var(--rb-cyan);
}

.page-about .ab-step:nth-child(4) {
  border-left-color: var(--rb-turf);
}

.page-about .ab-step__idx {
  font-family: var(--rb-font-num);
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 700;
  line-height: 1;
  min-width: 2.4ch;
  color: var(--rb-yellow);
  opacity: 0.92;
}

.page-about .ab-step:nth-child(1) .ab-step__idx {
  color: var(--rb-red);
}

.page-about .ab-step:nth-child(3) .ab-step__idx {
  color: var(--rb-cyan);
}

.page-about .ab-step:nth-child(4) .ab-step__idx {
  color: var(--rb-cyan);
}

.page-about .ab-step__title {
  margin: 0;
  font-size: clamp(16px, 2.1vw, 19px);
  font-weight: 700;
  line-height: 1.4;
}

.page-about .ab-step__text {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ab-body-soft);
  max-width: 68ch;
}

/* ---------- 发展历程时间轴 ---------- */

.page-about .ab-timeline {
  list-style: none;
  position: relative;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 3vw, 30px);
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--rb-red), var(--rb-yellow) 46%, var(--rb-cyan));
  opacity: 0.5;
}

.page-about .ab-tl {
  position: relative;
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 0 clamp(12px, 2.4vw, 24px);
}

.page-about .ab-tl__mark {
  position: relative;
  display: flex;
  justify-content: center;
}

.page-about .ab-tl__dot {
  position: relative;
  z-index: 1;
  margin-top: 5px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--rb-night);
  border: 2px solid var(--rb-yellow);
  box-shadow: 0 0 0 4px rgba(11, 18, 16, 0.9);
}

.page-about .ab-tl__dot--red {
  border-color: var(--rb-red);
}

.page-about .ab-tl__dot--cyan {
  border-color: var(--rb-cyan);
}

.page-about .ab-tl__dot--turf {
  border-color: var(--rb-turf);
}

.page-about .ab-tl__stage {
  margin: 0;
  font-family: var(--rb-font-num);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--rb-cyan);
}

.page-about .ab-tl__title {
  margin: 8px 0 0;
  font-size: clamp(16px, 2.2vw, 20px);
  font-weight: 700;
  line-height: 1.45;
}

.page-about .ab-tl__text {
  margin: 8px 0 0;
  max-width: 66ch;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--ab-body-soft);
}

.page-about .ab-history .ab-fig {
  margin-top: clamp(26px, 4vw, 44px);
}

/* ---------- 团队与基地 ---------- */

.page-about .ab-team__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .ab-roles {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-role {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 12px 14px;
  border-left: 2px solid var(--rb-cyan);
  background: var(--ab-panel-soft);
  font-size: 14px;
  line-height: 1.72;
}

.page-about .ab-role__k {
  font-weight: 700;
  color: var(--rb-white);
}

.page-about .ab-role__v {
  color: var(--ab-body-soft);
}

/* ---------- 协作生态 ---------- */

.page-about .ab-eco__list {
  list-style: none;
  margin: clamp(24px, 3.8vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(12px, 2vw, 18px);
}

.page-about .ab-eco__item {
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 2vw, 20px);
  padding: clamp(16px, 2.4vw, 24px);
  border: 1px solid var(--rb-line);
  background: linear-gradient(135deg, var(--ab-panel-soft), rgba(11, 18, 16, 0.6));
}

.page-about .ab-eco__num {
  font-family: var(--rb-font-num);
  font-size: clamp(30px, 5vw, 46px);
  font-weight: 700;
  line-height: 1;
  color: var(--rb-yellow);
}

.page-about .ab-eco__lbl {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ab-body);
}

.page-about .ab-eco__tail {
  margin-top: clamp(20px, 3vw, 28px);
}

/* ---------- 结尾入口 ---------- */

.page-about .ab-cta__box {
  position: relative;
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  padding: clamp(22px, 4vw, 44px) clamp(20px, 4vw, 48px);
  border: 1px solid var(--rb-line-strong);
  background: linear-gradient(135deg, rgba(226, 59, 46, 0.16) 0%, rgba(18, 53, 43, 0.62) 46%, rgba(11, 18, 16, 0.9) 100%);
}

.page-about .ab-cta__box::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--rb-red), var(--rb-yellow));
}

.page-about .ab-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 560px) {
  .page-about .ab-hero__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(18px, 3vw, 44px);
  }

  .page-about .ab-role {
    grid-template-columns: 6.6em minmax(0, 1fr);
    gap: 12px;
    align-items: baseline;
  }
}

@media (min-width: 760px) {
  .page-about .ab-eco__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-eco__item {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
}

@media (min-width: 860px) {
  .page-about .ab-method__head {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: end;
    gap: clamp(20px, 4vw, 56px);
  }

  .page-about .ab-cta__box {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .ab-cta__links {
    justify-content: flex-end;
  }
}

@media (min-width: 900px) {
  .page-about .ab-origin__grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
    align-items: start;
    gap: clamp(28px, 4.4vw, 56px);
  }

  .page-about .ab-fig--origin {
    margin-top: clamp(20px, 4vw, 56px);
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    align-items: center;
    gap: clamp(28px, 4.4vw, 56px);
  }
}

@media (min-width: 1024px) {
  .page-about .ab-hero__note {
    display: block;
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%) rotate(90deg);
    transform-origin: center;
    font-family: var(--rb-font-num);
    font-size: 11px;
    letter-spacing: 0.34em;
    color: var(--rb-slate);
    white-space: nowrap;
    z-index: 2;
  }

  .page-about .ab-personas__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(18px, 2.6vw, 28px) clamp(20px, 3vw, 36px);
  }

  .page-about .ab-persona:nth-child(2),
  .page-about .ab-persona:nth-child(4) {
    margin-top: clamp(12px, 2vw, 26px);
  }

  .page-about .ab-step {
    padding: clamp(20px, 2.4vw, 28px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tl__dot {
    box-shadow: none;
  }
}

.page-about {
  --rb-body: currentColor;
}