.page-about {
  background: var(--c-pitch);
  color: var(--c-white);
  font-family: var(--font-sans);
}

/* ============ 首屏 ============ */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + clamp(34px, 6vw, 92px)) 0 clamp(40px, 5vw, 76px);
  border-bottom: 3px solid var(--c-steel);
  background:
    radial-gradient(1100px 460px at 84% -12%, rgba(198, 255, 61, 0.13), transparent 64%),
    radial-gradient(880px 420px at 6% 112%, rgba(255, 106, 31, 0.11), transparent 66%),
    var(--c-pitch);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(90deg, rgba(36, 52, 65, 0.6) 1px, transparent 1px);
  background-size: clamp(64px, 8vw, 108px) 100%;
  opacity: 0.85;
  pointer-events: none;
}

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

.page-about .ab-hero__crumb {
  margin-bottom: clamp(18px, 2.6vw, 30px);
}

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

.page-about .ab-hero__title {
  margin: 16px 0 0;
  max-width: 15em;
  font-size: clamp(37px, 6.1vw, 94px);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.page-about .ab-hero__hl {
  font-style: normal;
  color: var(--c-lime);
}

.page-about .ab-hero__lead {
  margin: clamp(22px, 3vw, 36px) 0 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.15vw, 18px);
  line-height: 1.78;
  color: var(--c-dim);
}

.page-about .ab-hero__meta {
  margin: clamp(32px, 4.2vw, 56px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: var(--c-steel);
  border: 2px solid var(--c-steel);
}

.page-about .ab-hero__meta li {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 20px;
  background: var(--c-panel);
}

.page-about .ab-hero__val {
  font-size: clamp(26px, 3.4vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--c-lime);
}

.page-about .ab-hero__key {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-muted);
}

/* ============ 章节索引轨 ============ */
.page-about .ab-rail {
  position: sticky;
  top: var(--header-h);
  z-index: 6;
  background: rgba(11, 15, 20, 0.94);
  border-bottom: 2px solid var(--c-steel);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.page-about .ab-rail__inner {
  display: flex;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .ab-rail__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 14px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-muted);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 3px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  color: var(--c-white);
  border-bottom-color: var(--c-lime);
}

.page-about .ab-rail__num {
  font-size: 11px;
  color: var(--c-orange);
}

/* ============ 章节通用 ============ */
.page-about .ab-sec {
  position: relative;
  padding: clamp(52px, 6.6vw, 104px) 0;
  border-bottom: 2px solid var(--c-steel);
}

.page-about .ab-flow,
.page-about .ab-timeline,
.page-about .ab-fit {
  background: linear-gradient(180deg, var(--c-panel-2), var(--c-pitch));
}

.page-about .ab-sec__head {
  max-width: 74ch;
  margin-bottom: clamp(28px, 3.8vw, 50px);
}

.page-about .ab-h2 {
  margin: 14px 0 0;
  font-size: clamp(25px, 3.2vw, 40px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.01em;
}

.page-about .ab-lead {
  margin: 16px 0 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--c-dim);
}

/* ============ 01 定位与能力 ============ */
.page-about .ab-cap {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .ab-cap__item {
  padding: clamp(20px, 2.2vw, 28px);
  background: var(--c-panel);
  border: 2px solid var(--c-steel);
  border-left: 4px solid var(--c-steel);
  transition: border-color 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}

.page-about .ab-cap__item:hover {
  border-left-color: var(--c-lime);
  transform: translate(-2px, -2px);
  box-shadow: var(--hard-shadow-sm);
}

.page-about .ab-cap__num {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--c-orange);
}

.page-about .ab-cap__title {
  margin: 10px 0 0;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.3;
}

.page-about .ab-cap__desc {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--c-muted);
}

/* ============ 02 数据流程 ============ */
.page-about .ab-flow__steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .ab-step {
  background: var(--c-panel);
  border: 2px solid var(--c-steel);
  border-left: 4px solid var(--c-steel);
  transition: border-color 180ms ease;
}

.page-about .ab-step[open] {
  border-left-color: var(--c-lime);
}

.page-about .ab-step__sum {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  font-size: 17px;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}

.page-about .ab-step__sum::-webkit-details-marker {
  display: none;
}

.page-about .ab-step__sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--c-muted);
  transition: color 180ms ease;
}

.page-about .ab-step[open] .ab-step__sum::after {
  content: "\2212";
  color: var(--c-lime);
}

.page-about .ab-step__num {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  background: var(--c-lime);
  color: var(--c-pitch);
  font-size: 15px;
  font-weight: 700;
}

.page-about .ab-step__name {
  letter-spacing: 0.02em;
}

.page-about .ab-step__body {
  padding: 0 20px 22px;
}

.page-about .ab-step__body p {
  margin: 18px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-dim);
}

.page-about .ab-step__io {
  margin: 16px 0 0;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 14px;
  font-size: 13px;
  line-height: 1.6;
}

.page-about .ab-step__io dt {
  white-space: nowrap;
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  color: var(--c-orange);
}

.page-about .ab-step__io dd {
  margin: 0;
  color: var(--c-muted);
}

/* ============ 03 团队 ============ */
.page-about .ab-team__fig,
.page-about .ab-timeline__fig,
.page-about .ab-eco__fig {
  margin: 0 0 clamp(28px, 3.6vw, 48px);
}

.page-about .ab-team__fig img,
.page-about .ab-timeline__fig img,
.page-about .ab-eco__fig img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.2vw, 42px);
}

.page-about .ab-roles {
  padding: clamp(22px, 2.6vw, 34px);
  background: var(--c-panel);
  border: 2px solid var(--c-steel);
  box-shadow: var(--hard-shadow-sm);
}

.page-about .ab-roles__title {
  margin: 0 0 22px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.page-about .ab-roles__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.page-about .ab-role {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "name val"
    "bar bar";
  align-items: baseline;
  gap: 8px 12px;
}

.page-about .ab-role__name {
  grid-area: name;
  font-size: 15px;
  color: var(--c-dim);
  transition: color 160ms ease;
}

.page-about .ab-role__val {
  grid-area: val;
  font-size: 15px;
  font-weight: 700;
}

.page-about .ab-role__bar {
  grid-area: bar;
  display: block;
  height: 12px;
  background: var(--c-pitch);
  border: 1px solid var(--c-steel);
  transition: border-color 160ms ease;
}

.page-about .ab-role__fill {
  display: block;
  height: 100%;
  transition: filter 160ms ease;
}

.page-about .ab-role--a .ab-role__fill {
  width: 32.1%;
  background: var(--c-lime);
}

.page-about .ab-role--b .ab-role__fill {
  width: 28.6%;
  background: var(--c-cyan);
}

.page-about .ab-role--c .ab-role__fill {
  width: 25%;
  background: var(--c-amber);
}

.page-about .ab-role--d .ab-role__fill {
  width: 14.3%;
  background: var(--c-blue);
}

.page-about .ab-role:hover .ab-role__name {
  color: var(--c-white);
}

.page-about .ab-role:hover .ab-role__bar {
  border-color: var(--c-lime);
}

.page-about .ab-role:hover .ab-role__fill {
  filter: brightness(1.25);
}

.page-about .ab-team__notes {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .ab-note {
  padding: 16px 20px;
  background: var(--c-panel-2);
  border: 2px solid var(--c-steel);
  border-left: 4px solid var(--c-orange);
}

.page-about .ab-note__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-orange);
}

.page-about .ab-note__text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--c-dim);
}

/* ============ 04 发展历程 ============ */
.page-about .ab-tl {
  border: 2px solid var(--c-steel);
  background: var(--c-panel);
}

.page-about .ab-tl__list {
  display: flex;
  overflow-x: auto;
  border-bottom: 2px solid var(--c-steel);
  scrollbar-width: none;
}

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

.page-about .ab-tl__node {
  flex: 1 0 auto;
  min-width: 148px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 18px 15px;
  background: transparent;
  border: none;
  border-right: 1px solid var(--c-steel);
  border-bottom: 4px solid transparent;
  color: var(--c-muted);
  font-family: var(--font-sans);
  text-align: left;
  cursor: pointer;
  transition: color 160ms ease, background 160ms ease, border-color 160ms ease;
}

.page-about .ab-tl__node:hover {
  background: var(--c-panel-2);
  color: var(--c-white);
}

.page-about .ab-tl__node[aria-selected="true"] {
  background: var(--c-panel-2);
  color: var(--c-white);
  border-bottom-color: var(--c-lime);
}

.page-about .ab-tl__num {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-orange);
}

.page-about .ab-tl__label {
  font-size: 16px;
  font-weight: 700;
}

.page-about .ab-tl__year {
  font-size: 12px;
  color: var(--c-muted);
}

.page-about .ab-tl__panel {
  padding: clamp(22px, 2.8vw, 36px);
}

.page-about .ab-tl__panel[hidden] {
  display: none;
}

.page-about .ab-tl__panel p {
  margin: 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--c-dim);
}

.page-about .ab-tl__facts {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .ab-tl__facts li {
  padding: 6px 12px;
  font-size: 13px;
  color: var(--c-white);
  border: 1px solid var(--c-steel);
}

/* ============ 05 合作生态 ============ */
.page-about .ab-eco__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .ab-eco__card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(20px, 2.4vw, 28px);
  background: var(--c-panel);
  border: 2px solid var(--c-steel);
  transition: border-color 180ms ease, transform 180ms ease;
}

.page-about .ab-eco__card:hover {
  border-color: var(--c-cyan);
  transform: translate(-2px, -2px);
}

.page-about .ab-eco__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--c-cyan);
}

.page-about .ab-eco__title {
  margin: 0;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.3;
}

.page-about .ab-eco__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--c-muted);
}

.page-about .ab-eco__badge {
  margin: clamp(26px, 3.4vw, 46px) 0 0;
  padding: clamp(22px, 2.8vw, 34px);
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--c-lime);
  color: var(--c-pitch);
  border: 3px solid var(--c-pitch);
  box-shadow: var(--hard-shadow);
}

.page-about .ab-eco__badge-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
}

.page-about .ab-eco__badge-text {
  margin: 0;
  max-width: 42ch;
  font-size: clamp(18px, 2.2vw, 26px);
  font-weight: 700;
  line-height: 1.4;
}

/* ============ 06 适合谁用 ============ */
.page-about .ab-fit__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .ab-fit__card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(20px, 2.4vw, 28px);
  background: var(--c-panel);
  border: 2px solid var(--c-steel);
  transition: border-color 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}

.page-about .ab-fit__card:hover {
  border-color: var(--c-lime);
  transform: translate(-2px, -2px);
  box-shadow: var(--hard-shadow-sm);
}

.page-about .ab-fit__tag {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-orange);
}

.page-about .ab-fit__title {
  margin: 0;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.3;
}

.page-about .ab-fit__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--c-muted);
}

/* ============ 07 继续了解 ============ */
.page-about .ab-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .ab-next__card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(24px, 3vw, 38px);
  background: var(--c-panel);
  border: 2px solid var(--c-steel);
  color: inherit;
  text-decoration: none;
  transition: border-color 200ms ease, background 200ms ease, transform 200ms ease, box-shadow 200ms ease;
}

.page-about .ab-next__card:hover,
.page-about .ab-next__card:focus-visible {
  background: var(--c-panel-2);
  border-color: var(--c-lime);
  transform: translate(-3px, -3px);
  box-shadow: var(--hard-shadow);
}

.page-about .ab-next__tag {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--c-orange);
}

.page-about .ab-next__title {
  margin: 0;
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 800;
  line-height: 1.25;
}

.page-about .ab-next__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--c-dim);
}

.page-about .ab-next__go {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-lime);
}

.page-about .ab-next__more {
  margin: clamp(24px, 3vw, 36px) 0 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-muted);
}

.page-about .ab-next__more a {
  color: var(--c-lime);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-about .ab-next__more a:hover,
.page-about .ab-next__more a:focus-visible {
  color: var(--c-white);
}

/* ============ 响应式 ============ */
@media (max-width: 620px) {
  .page-about .ab-hero__br {
    display: none;
  }
}

@media (min-width: 680px) {
  .page-about .ab-hero__meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

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

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

@media (min-width: 1000px) {
  .page-about .ab-cap {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.9fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}