.page-about {
  background: var(--nb-cream);
  color: var(--nb-body);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: calc(var(--nb-head-h) + 30px) 0 clamp(44px, 8vw, 84px);
  color: var(--nb-cream);
  background:
    radial-gradient(120% 92% at 88% 4%, rgba(232, 255, 90, .14), transparent 58%),
    linear-gradient(158deg, var(--nb-black) 0%, var(--nb-green-900) 48%, var(--nb-green-700) 100%);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  right: -16%;
  bottom: -26%;
  width: 82%;
  height: 96%;
  pointer-events: none;
  background: linear-gradient(206deg, rgba(226, 65, 47, .34), rgba(226, 65, 47, 0) 68%);
  clip-path: polygon(18% 0, 100% 0, 100% 100%, 0 76%);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0;
  pointer-events: none;
  opacity: .55;
  background-image: repeating-linear-gradient(
    0deg,
    rgba(237, 233, 225, .035) 0 1px,
    transparent 1px 4px
  );
}

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

.page-about .ab-hero__crumb,
.page-about .ab-hero__crumb a {
  color: rgba(237, 233, 225, .68);
}

.page-about .ab-hero__crumb a:hover {
  color: var(--nb-yellow);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 30px;
  margin-top: 20px;
}

.page-about .ab-hero__eyebrow {
  color: var(--nb-yellow);
  margin: 0;
}

.page-about .ab-hero .nb-h1 {
  margin: 12px 0 0;
  max-width: 15em;
  color: var(--nb-cream);
  font-size: clamp(30px, 7.4vw, 58px);
  line-height: 1.1;
  font-weight: 900;
  letter-spacing: -0.012em;
}

.page-about .ab-hero__lead {
  margin: 16px 0 0;
  max-width: 40em;
  font-size: clamp(15px, 2.4vw, 17px);
  line-height: 1.78;
  color: rgba(237, 233, 225, .86);
}

.page-about .ab-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about .ab-hero__side {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--nb-line-dark);
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 15px 12px 15px 0;
  border-bottom: 1px solid var(--nb-line-dark);
}

.page-about .ab-stat:nth-child(even) {
  padding-left: 16px;
  border-left: 1px solid var(--nb-line-dark);
}

.page-about .ab-stat .nb-num {
  color: var(--nb-yellow);
  line-height: 1;
}

.page-about .ab-stat em {
  font-style: normal;
  font-size: .42em;
  letter-spacing: .02em;
  margin-left: 3px;
  color: rgba(237, 233, 225, .78);
}

.page-about .ab-stat .nb-index {
  color: rgba(237, 233, 225, .58);
  line-height: 1.4;
}

.page-about .ab-hero__pulse {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
}

@media (min-width: 1000px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    column-gap: clamp(36px, 5vw, 76px);
    align-items: end;
    margin-top: 34px;
  }
}

/* ---------- 章节标题组 ---------- */
.page-about .ab-sec-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px 28px;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .ab-sec-head__no {
  order: -1;
  margin: 0;
  font-family: var(--nb-font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--nb-red);
}

.page-about .ab-sec-head__main .nb-h2 {
  margin: 0;
  max-width: 22em;
}

.page-about .ab-sec-head__main .nb-lead {
  margin: 12px 0 0;
  max-width: 44em;
}

@media (min-width: 900px) {
  .page-about .ab-sec-head {
    grid-template-columns: minmax(0, 1fr) minmax(96px, 180px);
    align-items: start;
  }

  .page-about .ab-sec-head__no {
    order: 0;
    text-align: right;
    padding-top: 6px;
  }
}

/* ---------- 01 品牌主张 ---------- */
.page-about .ab-why__rows {
  display: grid;
  border-top: 1px solid var(--nb-line-strong);
}

.page-about .ab-why__row {
  display: grid;
  gap: 6px 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--nb-line);
  transition: background-color .18s ease-out;
}

.page-about .ab-why__k {
  margin: 0;
  font-size: 17px;
  font-weight: 800;
  color: var(--nb-green-900);
}

.page-about .ab-why__v {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--nb-body);
}

@media (min-width: 860px) {
  .page-about .ab-why__row {
    grid-template-columns: minmax(0, 190px) minmax(0, 1fr);
    align-items: baseline;
    padding: 24px 14px 24px 0;
  }

  .page-about .ab-why__row:hover {
    background: rgba(62, 107, 79, .06);
  }
}

.page-about .ab-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: clamp(28px, 4vw, 46px);
  border-top: 1px solid var(--nb-line-strong);
}

.page-about .ab-metric {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 16px 12px 16px 0;
}

.page-about .ab-metric .nb-num {
  color: var(--nb-red);
  line-height: 1;
}

.page-about .ab-metric em {
  font-style: normal;
  font-size: .42em;
  margin-left: 3px;
  color: var(--nb-muted);
}

.page-about .ab-metric .nb-index {
  color: var(--nb-muted);
  line-height: 1.4;
}

.page-about .ab-metric:nth-child(even) {
  padding-left: 16px;
  border-left: 1px solid var(--nb-line);
}

@media (min-width: 720px) {
  .page-about .ab-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-metric {
    padding: 20px 18px 20px 0;
  }

  .page-about .ab-metric + .ab-metric {
    padding-left: 20px;
    border-left: 1px solid var(--nb-line);
  }
}

/* ---------- 02 校验流程 ---------- */
.page-about .ab-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  border-top: 1px solid var(--nb-line-strong);
}

.page-about .ab-step {
  position: relative;
  padding: 22px 0;
  border-bottom: 1px solid var(--nb-line);
}

.page-about .ab-step__no {
  display: block;
  font-family: var(--nb-font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--nb-blue);
  margin-bottom: 8px;
}

.page-about .ab-step .nb-h3 {
  margin: 0 0 8px;
  color: var(--nb-green-900);
}

.page-about .ab-step .nb-text {
  margin: 0;
}

@media (min-width: 900px) {
  .page-about .ab-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-bottom: 1px solid var(--nb-line-strong);
  }

  .page-about .ab-step {
    border-bottom: 0;
    padding: 26px 28px 8px 0;
  }

  .page-about .ab-step + .ab-step {
    padding-left: 28px;
    border-left: 1px solid var(--nb-line);
  }
}

.page-about .ab-chain-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 42px;
  margin-top: clamp(26px, 4vw, 42px);
  padding: 20px 22px;
  background: var(--nb-card);
  border: 1px solid var(--nb-line-strong);
  border-left: 3px solid var(--nb-red);
  border-radius: var(--nb-radius);
  box-shadow: var(--nb-shadow);
}

.page-about .ab-chain-bar__item {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .ab-chain-bar__item .nb-num {
  color: var(--nb-red);
  line-height: 1;
}

.page-about .ab-chain-bar__item .nb-index {
  color: var(--nb-muted);
}

.page-about .ab-chain-bar__note {
  flex: 1 1 220px;
}

.page-about .ab-chain-bar__note .nb-index {
  color: var(--nb-green-700);
  letter-spacing: .06em;
}

/* ---------- 03 团队 ---------- */
.page-about .ab-team__grid {
  row-gap: 30px;
}

.page-about .ab-team__media {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--nb-line-dark);
  border-radius: var(--nb-radius);
}

.page-about .ab-team__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(.9) contrast(1.04);
}

.page-about .ab-roster {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--nb-line-dark);
}

.page-about .ab-roster__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 5px 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--nb-line-dark);
  transition: background-color .18s ease-out;
}

.page-about .ab-roster__row:hover {
  background: rgba(232, 255, 90, .05);
}

.page-about .ab-roster__role {
  font-size: 16px;
  font-weight: 800;
  color: var(--nb-cream);
  align-self: end;
}

.page-about .ab-roster__num {
  font-family: var(--nb-font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--nb-yellow);
  text-align: right;
  white-space: nowrap;
  align-self: end;
}

.page-about .ab-roster__num small {
  font-size: 11px;
  letter-spacing: .08em;
  margin-left: 3px;
  color: rgba(237, 233, 225, .55);
}

.page-about .ab-roster__desc {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(237, 233, 225, .72);
}

@media (min-width: 900px) {
  .page-about .ab-roster__row {
    grid-template-columns: 150px 62px minmax(0, 1fr);
    align-items: baseline;
    column-gap: 20px;
  }

  .page-about .ab-roster__desc {
    grid-column: 3;
  }
}

/* ---------- 04 发展历程 ---------- */
.page-about .ab-hist__grid {
  row-gap: 32px;
}

.page-about .ab-timeline {
  position: relative;
  padding-left: 30px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(
    180deg,
    var(--nb-red) 0%,
    var(--nb-yellow) 34%,
    var(--nb-blue) 70%,
    var(--nb-rock) 100%
  );
}

.page-about .ab-tl__item {
  position: relative;
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 24px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--nb-cream);
  border: 2px solid var(--nb-red);
  z-index: 1;
}

.page-about .ab-tl__btn {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 26px;
  grid-template-areas:
    "no icon"
    "title icon";
  align-items: center;
  column-gap: 14px;
  row-gap: 4px;
  width: 100%;
  padding: 18px 6px 18px 0;
  text-align: left;
  border-bottom: 1px solid var(--nb-line);
}

.page-about .ab-tl__no {
  grid-area: no;
  font-family: var(--nb-font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--nb-red);
}

.page-about .ab-tl__title {
  grid-area: title;
  font-size: 16px;
  font-weight: 800;
  line-height: 1.45;
  color: var(--nb-green-900);
}

.page-about .ab-tl__icon {
  grid-area: icon;
  justify-self: end;
  position: relative;
  width: 22px;
  height: 22px;
  border: 1px solid var(--nb-line-strong);
  border-radius: 50%;
  transition: transform .18s ease-out, border-color .18s ease-out;
}

.page-about .ab-tl__icon::before,
.page-about .ab-tl__icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--nb-red);
  transform: translate(-50%, -50%);
  transition: opacity .18s ease-out;
}

.page-about .ab-tl__icon::before {
  width: 9px;
  height: 1.5px;
}

.page-about .ab-tl__icon::after {
  width: 1.5px;
  height: 9px;
}

.page-about .ab-tl__item[data-open] .ab-tl__icon {
  transform: rotate(90deg);
  border-color: var(--nb-yellow);
}

.page-about .ab-tl__item[data-open] .ab-tl__icon::after {
  opacity: 0;
}

.page-about .ab-tl__panel {
  padding: 2px 0 20px;
}

.page-about .ab-tl__panel .nb-text {
  margin: 0;
  padding-left: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--nb-body);
}

@media (min-width: 760px) {
  .page-about .ab-tl__btn {
    grid-template-columns: 112px minmax(0, 1fr) 26px;
    grid-template-areas: "no title icon";
    align-items: baseline;
    padding: 20px 6px 20px 0;
  }
}

.page-about .ab-hist__media {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--nb-line);
  border-radius: var(--nb-radius);
}

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

@media (min-width: 900px) {
  .page-about .ab-hist__media {
    position: sticky;
    top: calc(var(--nb-head-h) + 24px);
  }
}

/* ---------- 05 覆盖体系 ---------- */
.page-about .ab-cov__grid {
  row-gap: 30px;
}

.page-about .ab-league-list {
  display: grid;
  gap: 1px;
  background: var(--nb-line);
  border: 1px solid var(--nb-line);
  border-radius: var(--nb-radius);
}

.page-about .ab-league-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 20px 20px 22px;
  background: var(--nb-card);
}

.page-about .ab-league-row__num {
  font-family: var(--nb-font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--nb-green-700);
}

.page-about .ab-league-row .nb-h3 {
  margin: 0 0 8px;
  color: var(--nb-green-900);
}

.page-about .ab-league-row .nb-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
}

.page-about .ab-fields {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  border-top: 1px solid var(--nb-line-strong);
}

.page-about .ab-field {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--nb-line);
  transition: background-color .18s ease-out;
}

.page-about .ab-field:hover {
  background: rgba(92, 127, 163, .07);
}

.page-about .ab-field__no {
  font-family: var(--nb-font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--nb-blue);
  padding-top: 5px;
}

.page-about .ab-field .nb-h3 {
  margin: 0 0 6px;
  color: var(--nb-green-900);
}

.page-about .ab-field .nb-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
}

.page-about .ab-views {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  margin-top: clamp(26px, 4vw, 40px);
  padding: 18px 20px;
  border: 1px solid var(--nb-line);
  border-radius: var(--nb-radius);
  background: var(--nb-card);
}

.page-about .ab-views__label {
  font-family: var(--nb-font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--nb-muted);
  text-transform: uppercase;
}

.page-about .ab-views__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
}

.page-about .ab-views__list .nb-pill {
  border-color: var(--nb-line-strong);
  color: var(--nb-green-900);
}

.page-about .ab-views__note {
  flex: 1 1 240px;
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--nb-muted);
}

.page-about .ab-cov__links {
  margin: clamp(22px, 3vw, 32px) 0 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--nb-body);
  padding-left: 14px;
  border-left: 3px solid var(--nb-yellow);
}

.page-about .ab-cov__links a {
  color: var(--nb-red-700);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid rgba(168, 35, 26, .32);
  transition: border-color .18s ease-out, color .18s ease-out;
}

.page-about .ab-cov__links a:hover {
  color: var(--nb-red);
  border-bottom-color: var(--nb-red);
}

/* ---------- 06 合作生态 ---------- */
.page-about .ab-partners__grid {
  row-gap: 30px;
}

.page-about .ab-partners__copy {
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.82;
}

.page-about .ab-awards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  border-top: 1px solid var(--nb-line-dark);
  padding-top: 18px;
}

.page-about .ab-awards li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
}

.page-about .ab-awards__num {
  font-family: var(--nb-font-mono);
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  color: var(--nb-yellow);
}

.page-about .ab-awards__txt {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(237, 233, 225, .74);
}

.page-about .ab-partner-list {
  border-top: 1px solid var(--nb-line-dark);
}

.page-about .ab-partner__btn {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 26px;
  align-items: center;
  column-gap: 16px;
  width: 100%;
  padding: 18px 6px 18px 0;
  text-align: left;
  border-bottom: 1px solid var(--nb-line-dark);
}

.page-about .ab-partner__name {
  font-size: 16px;
  font-weight: 800;
  color: var(--nb-cream);
}

.page-about .ab-partner__icon {
  justify-self: end;
  position: relative;
  width: 22px;
  height: 22px;
  border: 1px solid var(--nb-line-dark);
  border-radius: 50%;
  transition: transform .18s ease-out, border-color .18s ease-out;
}

.page-about .ab-partner__icon::before,
.page-about .ab-partner__icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--nb-yellow);
  transform: translate(-50%, -50%);
  transition: opacity .18s ease-out;
}

.page-about .ab-partner__icon::before {
  width: 9px;
  height: 1.5px;
}

.page-about .ab-partner__icon::after {
  width: 1.5px;
  height: 9px;
}

.page-about .ab-partner[data-open] .ab-partner__icon {
  transform: rotate(90deg);
  border-color: var(--nb-yellow);
}

.page-about .ab-partner[data-open] .ab-partner__icon::after {
  opacity: 0;
}

.page-about .ab-partner .nb-disclose__panel .nb-disclose__body .nb-text {
  margin: 0;
  padding: 14px 0 18px;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(237, 233, 225, .76);
}

.page-about .ab-partners__media {
  margin: clamp(32px, 5vw, 54px) 0 0;
  overflow: hidden;
  border: 1px solid var(--nb-line-dark);
  border-radius: var(--nb-radius);
  aspect-ratio: 3 / 2;
}

.page-about .ab-partners__media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: .86;
}

@media (min-width: 860px) {
  .page-about .ab-partners__media {
    aspect-ratio: 21 / 8;
  }
}

/* ---------- 07 联系 ---------- */
.page-about .ab-doors {
  row-gap: 24px;
}

.page-about .ab-door {
  padding-top: 18px;
  border-top: 2px solid var(--nb-green-900);
}

.page-about .ab-door__tag {
  color: var(--nb-red);
  margin: 0 0 8px;
  display: block;
}

.page-about .ab-door .nb-h3 {
  margin: 0 0 8px;
  color: var(--nb-green-900);
}

.page-about .ab-door .nb-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.74;
}

.page-about .ab-contact__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(28px, 4vw, 42px);
  padding-top: clamp(24px, 3vw, 34px);
  border-top: 1px solid var(--nb-line);
}

/* ---------- 焦点态与动效偏好 ---------- */
.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--nb-yellow);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(232, 255, 90, .28);
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
}