.page-about {
  --ab-axis-w: 132px;
  --ab-ink: #0A111C;
  --ab-paper-ink: #3F4C5C;
  position: relative;
  color: var(--bp-gray);
  background: var(--bp-void);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: 28px 0 52px;
  border-bottom: 1px solid var(--bp-line);
  background:
    radial-gradient(120% 88% at 86% -12%, rgba(37, 230, 216, 0.10), transparent 58%),
    radial-gradient(88% 68% at 2% 0%, rgba(255, 90, 43, 0.08), transparent 60%);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(18, 58, 94, 0.55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(18, 58, 94, 0.55) 1px, transparent 1px);
  background-size: 68px 68px;
  opacity: 0.45;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 94%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 94%);
}

.page-about .ab-hero > .bp-shell {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 30px;
  margin-top: 28px;
  align-items: end;
}

.page-about .ab-hero__panel {
  position: relative;
  padding: 26px 22px 32px;
  background: var(--bp-paper);
  color: var(--ab-ink);
  border-radius: var(--bp-r);
  box-shadow: 0 26px 64px -34px rgba(0, 0, 0, 0.9);
}

.page-about .ab-hero__panel::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--bp-hot), var(--bp-amber) 62%, var(--bp-cyan));
  border-radius: 0 0 var(--bp-r) var(--bp-r);
}

.page-about .ab-hero__kicker {
  color: #58697C;
  letter-spacing: 0.14em;
}

.page-about .ab-hero__title {
  margin: 14px 0 0;
  font-family: var(--bp-sans);
  font-weight: 900;
  font-size: clamp(30px, 7.4vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.022em;
  color: var(--ab-ink);
}

.page-about .ab-hero__side .bp-lead {
  margin: 0;
  color: var(--bp-mist);
}

.page-about .ab-hero__index {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  border-top: 1px solid var(--bp-line);
}

.page-about .ab-hero__index li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 2px;
  border-bottom: 1px solid var(--bp-line);
  font-size: 14px;
  color: var(--bp-gray);
}

.page-about .ab-hero__index .bp-num {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--bp-cyan);
}

.page-about .ab-hero__media {
  margin: 32px 0 0;
  border: 1px solid var(--bp-line);
  border-radius: var(--bp-r);
  overflow: hidden;
  background: var(--bp-panel);
  aspect-ratio: 3 / 2;
}

.page-about .ab-hero__media .bp-media__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .ab-hero__media .bp-media__caption {
  padding: 10px 14px;
  font-size: 12px;
  color: var(--bp-mute);
  background: rgba(5, 11, 24, 0.88);
  border-top: 1px solid var(--bp-line);
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-sec {
  position: relative;
  padding: 54px 0;
  border-bottom: 1px solid var(--bp-line);
}

.page-about .ab-sec--last {
  border-bottom: 0;
}

.page-about .ab-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 14px;
  margin-bottom: 26px;
  border-bottom: 1px solid var(--bp-line);
}

.page-about .ab-sec__index {
  flex: 0 0 auto;
  display: inline-block;
  padding: 3px 8px;
  font-family: var(--bp-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ab-ink);
  background: var(--bp-paper);
  border-radius: 2px;
}

.page-about .ab-sec__title {
  margin: 0;
  font-family: var(--bp-sans);
  font-weight: 800;
  font-size: clamp(23px, 4.6vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.018em;
  color: var(--bp-paper);
}

.page-about .ab-sec__intro {
  margin: 0 0 26px;
  max-width: 46em;
}

.page-about .ab-split {
  display: grid;
  gap: 26px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .ab-split__main {
  min-width: 0;
}

.page-about .ab-split__side {
  min-width: 0;
}

/* ---------- 侧栏说明卡 ---------- */
.page-about .ab-panel-card {
  background: var(--bp-panel);
  border-color: var(--bp-line);
}

.page-about .ab-panel-card__list {
  list-style: none;
  margin: 0;
  padding: 4px 0 0;
}

.page-about .ab-panel-card__list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 0;
  border-top: 1px solid var(--bp-line);
  font-size: 14px;
  line-height: 1.65;
  color: var(--bp-mist);
}

.page-about .ab-panel-card__list .bp-tag {
  flex: 0 0 auto;
  margin-top: 2px;
}

/* ---------- 数据条 ---------- */
.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 34px;
  border-top: 1px solid var(--bp-line);
  border-left: 1px solid var(--bp-line);
}

.page-about .ab-stat {
  padding: 18px 16px;
  border-right: 1px solid var(--bp-line);
  border-bottom: 1px solid var(--bp-line);
  background: linear-gradient(180deg, rgba(11, 23, 41, 0.7), rgba(5, 11, 24, 0.2));
}

.page-about .ab-stat__num {
  display: block;
  font-family: var(--bp-mono);
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--bp-cyan);
}

.page-about .ab-stat__unit {
  margin-left: 3px;
  font-size: 14px;
  letter-spacing: 0;
  color: var(--bp-mist);
}

.page-about .ab-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--bp-mute);
}

/* ---------- 团队标签页 ---------- */
.page-about .ab-tabs {
  position: relative;
  border: 1px solid var(--bp-line);
  border-radius: var(--bp-r);
  background: var(--bp-panel);
  overflow: hidden;
}

.page-about .ab-tabs__input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .ab-tabs__nav {
  display: flex;
  border-bottom: 1px solid var(--bp-line);
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .ab-tabs__label {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 46px;
  padding: 12px 18px;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  color: var(--bp-mute);
  border-right: 1px solid var(--bp-line);
  cursor: pointer;
  transition: background 0.22s ease, color 0.22s ease;
}

.page-about .ab-tabs__label .bp-num {
  font-size: 14px;
  color: var(--bp-anno);
  transition: color 0.22s ease;
}

.page-about .ab-tabs__label:hover {
  color: var(--bp-paper);
}

.page-about #ab-team-1:focus-visible ~ .ab-tabs__nav .ab-tabs__label[for="ab-team-1"],
.page-about #ab-team-2:focus-visible ~ .ab-tabs__nav .ab-tabs__label[for="ab-team-2"],
.page-about #ab-team-3:focus-visible ~ .ab-tabs__nav .ab-tabs__label[for="ab-team-3"],
.page-about #ab-team-4:focus-visible ~ .ab-tabs__nav .ab-tabs__label[for="ab-team-4"] {
  outline: 2px solid var(--bp-cyan);
  outline-offset: -4px;
}

.page-about #ab-team-1:checked ~ .ab-tabs__nav .ab-tabs__label[for="ab-team-1"],
.page-about #ab-team-2:checked ~ .ab-tabs__nav .ab-tabs__label[for="ab-team-2"],
.page-about #ab-team-3:checked ~ .ab-tabs__nav .ab-tabs__label[for="ab-team-3"],
.page-about #ab-team-4:checked ~ .ab-tabs__nav .ab-tabs__label[for="ab-team-4"] {
  background: var(--bp-cyan);
  color: var(--bp-void);
}

.page-about #ab-team-1:checked ~ .ab-tabs__nav .ab-tabs__label[for="ab-team-1"] .bp-num,
.page-about #ab-team-2:checked ~ .ab-tabs__nav .ab-tabs__label[for="ab-team-2"] .bp-num,
.page-about #ab-team-3:checked ~ .ab-tabs__nav .ab-tabs__label[for="ab-team-3"] .bp-num,
.page-about #ab-team-4:checked ~ .ab-tabs__nav .ab-tabs__label[for="ab-team-4"] .bp-num {
  color: var(--bp-void);
}

.page-about .ab-tab-panel {
  display: none;
  padding: 24px 20px 28px;
  animation: ab-fade-in 0.32s ease both;
}

.page-about #ab-team-1:checked ~ .ab-tabs__panels .ab-tab-panel--1,
.page-about #ab-team-2:checked ~ .ab-tabs__panels .ab-tab-panel--2,
.page-about #ab-team-3:checked ~ .ab-tabs__panels .ab-tab-panel--3,
.page-about #ab-team-4:checked ~ .ab-tabs__panels .ab-tab-panel--4 {
  display: block;
}

.page-about .ab-tab-panel__role {
  margin: 0 0 12px;
  font-family: var(--bp-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--bp-hot);
}

.page-about .ab-tab-panel__list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  border-top: 1px solid var(--bp-line);
}

.page-about .ab-tab-panel__list li {
  position: relative;
  padding: 11px 0 11px 18px;
  border-bottom: 1px solid var(--bp-line);
  font-size: 14px;
  line-height: 1.65;
  color: var(--bp-mist);
}

.page-about .ab-tab-panel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 19px;
  width: 7px;
  height: 7px;
  border: 1px solid var(--bp-cyan);
  transform: rotate(45deg);
}

@keyframes ab-fade-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 横向流程带 ---------- */
.page-about .ab-flow {
  margin-top: 6px;
  border-top: 1px solid var(--bp-line);
  border-bottom: 1px solid var(--bp-line);
  background: linear-gradient(180deg, rgba(11, 23, 41, 0.92), rgba(5, 11, 24, 0.35));
}

.page-about .ab-flow__list {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-flow__step {
  position: relative;
  flex: 0 0 auto;
  width: 248px;
  padding: 22px 20px 26px;
  border-right: 1px solid var(--bp-line);
}

.page-about .ab-flow__step::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--bp-cyan), transparent);
  opacity: 0.5;
}

.page-about .ab-flow__no {
  font-family: var(--bp-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--bp-hot);
}

.page-about .ab-flow__step h3 {
  margin: 10px 0 8px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--bp-paper);
}

.page-about .ab-flow__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--bp-mute);
}

.page-about .ab-verify__note {
  margin-top: 26px;
  padding: 18px 20px;
  border-left: 3px solid var(--bp-hot);
  background: rgba(255, 90, 43, 0.06);
}

.page-about .ab-verify__note .bp-prose {
  margin: 0;
}

/* ---------- 版本轴 ---------- */
.page-about .ab-timeline {
  margin-top: 4px;
}

.page-about .ab-axis {
  position: relative;
  display: flex;
  gap: 16px;
  padding: 2px 0 16px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .ab-axis__node {
  position: relative;
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 2px;
  font-size: 13px;
  color: var(--bp-mute);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .ab-axis__node::before {
  content: "";
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  background: var(--bp-void);
  border: 1px solid var(--bp-cyan);
  transform: rotate(45deg);
}

.page-about .ab-axis__node .bp-num {
  font-size: 13px;
  letter-spacing: 0.06em;
}

.page-about .ab-axis__node:hover,
.page-about .ab-axis__node:focus-visible {
  color: var(--bp-paper);
  outline: none;
}

.page-about .ab-axis__node:focus-visible::before {
  background: var(--bp-cyan);
}

.page-about .ab-axis__body {
  min-width: 0;
}

.page-about .ab-rel {
  padding-bottom: 26px;
  margin-bottom: 26px;
  border-bottom: 1px solid var(--bp-line);
  scroll-margin-top: 130px;
}

.page-about .ab-rel p {
  max-width: 40em;
}

.page-about .ab-rel .bp-annot {
  display: block;
  color: var(--bp-anno);
  letter-spacing: 0.16em;
}

.page-about .ab-rel__ver {
  margin: 8px 0 12px;
  font-family: var(--bp-mono);
  font-size: clamp(26px, 5vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--bp-hot);
}

.page-about .ab-rel p + p {
  margin-top: 12px;
}

.page-about .ab-tlmedia {
  margin: 6px 0 0;
  max-width: 420px;
  border: 1px solid var(--bp-line);
  border-radius: var(--bp-r);
  overflow: hidden;
  background: var(--bp-panel);
}

.page-about .ab-tlmedia .bp-media__img {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 资质 ---------- */
.page-about .ab-credits {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--bp-line);
  border-left: 1px solid var(--bp-line);
}

.page-about .ab-credits__item {
  padding: 16px 14px;
  border-right: 1px solid var(--bp-line);
  border-bottom: 1px solid var(--bp-line);
}

.page-about .ab-credits__num {
  display: block;
  font-family: var(--bp-mono);
  font-size: 26px;
  line-height: 1.1;
  color: var(--bp-amber);
}

.page-about .ab-credits__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--bp-mute);
}

.page-about .ab-credits__media {
  margin: 0;
  border: 1px solid var(--bp-line);
  border-radius: var(--bp-r);
  overflow: hidden;
  background: var(--bp-panel);
}

.page-about .ab-credits__media .bp-media__img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .ab-credits__media .bp-media__caption {
  padding: 10px 14px;
  font-size: 12px;
  color: var(--bp-mute);
  border-top: 1px solid var(--bp-line);
}

/* ---------- 服务标准 ---------- */
.page-about .ab-std {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--bp-line);
}

.page-about .ab-std__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 0;
  border-bottom: 1px solid var(--bp-line);
}

.page-about .ab-std__no {
  font-family: var(--bp-mono);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--bp-cyan);
  padding-top: 3px;
}

.page-about .ab-std__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--bp-paper);
}

.page-about .ab-std__body p {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--bp-gray);
}

.page-about .ab-std__body a {
  color: var(--bp-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 结尾引导 ---------- */
.page-about .ab-cta {
  padding: 52px 0 64px;
  border-top: 1px solid var(--bp-line);
  background:
    radial-gradient(100% 120% at 88% 100%, rgba(37, 230, 216, 0.12), transparent 62%),
    linear-gradient(180deg, rgba(5, 11, 24, 0.2), rgba(11, 23, 41, 0.75));
}

.page-about .ab-cta__inner {
  border-left: 3px solid var(--bp-cyan);
  padding-left: 20px;
}

.page-about .ab-cta__kicker {
  display: block;
  color: var(--bp-anno);
  letter-spacing: 0.18em;
}

.page-about .ab-cta__title {
  margin: 10px 0 14px;
  font-family: var(--bp-sans);
  font-weight: 800;
  font-size: clamp(22px, 4.4vw, 34px);
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--bp-paper);
}

.page-about .ab-cta__text {
  margin: 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--bp-gray);
}

.page-about .ab-cta__text a {
  color: var(--bp-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .ab-flow__step {
    width: 300px;
    padding: 26px 24px 32px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-sec {
    padding: 76px 0;
  }

  .page-about .ab-hero {
    padding: 36px 0 64px;
  }

  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 52px;
    margin-top: 44px;
  }

  .page-about .ab-hero__panel {
    padding: 34px 32px 42px;
  }

  .page-about .ab-hero__media {
    margin-top: 52px;
    aspect-ratio: 16 / 7;
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .ab-tab-panel {
    padding: 30px 30px 34px;
  }

  .page-about .ab-cta {
    padding: 72px 0 88px;
  }

  .page-about .ab-cta__inner {
    padding-left: 30px;
  }
}

@media (min-width: 920px) {
  .page-about .ab-timeline {
    display: grid;
    grid-template-columns: var(--ab-axis-w) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-axis {
    position: sticky;
    top: 132px;
    display: block;
    padding: 0 0 0 0;
    overflow: visible;
  }

  .page-about .ab-axis::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 12px;
    bottom: 12px;
    width: 1px;
    background: linear-gradient(180deg, var(--bp-cyan), var(--bp-line) 70%, transparent);
  }

  .page-about .ab-axis__node {
    padding: 10px 0 10px 26px;
  }

  .page-about .ab-axis__node::before {
    position: absolute;
    left: 0;
    top: 50%;
    margin-top: -4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tab-panel {
    animation: none;
  }

  .page-about .ab-tabs__label {
    transition: none;
  }
}