.page-about {
  --ab-pad: clamp(48px, 7vw, 96px);
  --ab-gap: clamp(20px, 3vw, 40px);
  background: var(--ink-green-900);
  color: var(--paper-050);
  font-family: var(--font-body);
  overflow-x: hidden;
}

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

/* ---------- 首屏框景 ---------- */
.page-about .ab-hero {
  padding: clamp(20px, 3.5vw, 44px) 0 clamp(36px, 5vw, 72px);
}

.page-about .ab-hero__frame {
  position: relative;
  border: var(--bw-3) solid var(--line-600);
  padding: clamp(26px, 5vw, 64px);
  background:
    radial-gradient(115% 95% at 88% -10%, rgba(255, 90, 43, .16), transparent 58%),
    linear-gradient(180deg, rgba(16, 36, 29, .85) 0%, rgba(11, 26, 22, .96) 100%);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-hero__frame::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 14px;
  background-image: repeating-linear-gradient(to right, var(--lime-500) 0 1px, transparent 1px 28px);
  opacity: .32;
  pointer-events: none;
}

.page-about .ab-hero__title {
  margin: clamp(14px, 2vw, 22px) 0 0;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(52px, 12vw, 128px);
  line-height: .9;
  letter-spacing: -.03em;
  color: var(--paper-050);
}

.page-about .ab-hero__sub {
  margin: clamp(10px, 1.6vw, 18px) 0 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(16px, 2.2vw, 24px);
  letter-spacing: .04em;
  color: var(--lime-500);
}

.page-about .ab-hero__lede {
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.78;
  color: var(--paper-050);
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: clamp(28px, 4vw, 48px);
  padding-top: clamp(16px, 2.4vw, 24px);
  border-top: var(--bw) solid var(--line-600);
}

.page-about .ab-hero__stat-v {
  display: block;
  font-family: var(--font-data);
  font-weight: 800;
  font-size: clamp(24px, 4.4vw, 42px);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--paper-050);
}

.page-about .ab-hero__stat:first-child .ab-hero__stat-v {
  color: var(--ember-500);
}

.page-about .ab-hero__stat-k {
  display: block;
  margin-top: 8px;
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist-400);
}

/* ---------- 章节容器 ---------- */
.page-about .ab-section {
  padding: var(--ab-pad) 0;
}

.page-about .ab-section--alt {
  background: var(--ink-green-800);
  border-top: var(--bw) solid var(--line-600);
  border-bottom: var(--bw) solid var(--line-600);
}

/* ---------- 横向主题带 ---------- */
.page-about .ab-band {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 18px;
  padding: 14px 0;
  border-top: var(--bw-3) solid var(--line-600);
  border-bottom: var(--bw) solid var(--line-600);
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist-400);
}

.page-about .ab-band__no {
  color: var(--lime-500);
  font-weight: 700;
}

.page-about .ab-band__num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 3.2vw, 34px);
  letter-spacing: -.02em;
  text-transform: none;
  color: var(--lime-500);
}

.page-about .ab-band__note {
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: .06em;
  text-transform: none;
  color: var(--mist-400);
}

/* ---------- 标题与导语 ---------- */
.page-about .ab-h2 {
  margin: clamp(24px, 3.6vw, 44px) 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(30px, 5.6vw, 62px);
  line-height: 1.04;
  letter-spacing: -.02em;
  color: var(--paper-050);
}

.page-about .ab-h2--tight {
  margin-top: 0;
  font-size: clamp(26px, 4vw, 42px);
}

.page-about .ab-lead {
  margin: clamp(16px, 2.2vw, 24px) 0 0;
  max-width: 58ch;
  font-size: clamp(16px, 1.85vw, 18px);
  line-height: 1.78;
  color: var(--mist-400);
}

/* ---------- 双栏对照 ---------- */
.page-about .ab-cols {
  display: grid;
  gap: var(--ab-gap);
  margin-top: clamp(18px, 2.6vw, 32px);
}

.page-about .ab-cols__side {
  align-self: start;
}

.page-about .ab-side-note {
  margin: 0;
  border-left: 3px solid var(--lime-500);
  padding: 6px 0 6px clamp(14px, 1.8vw, 20px);
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist-400);
}

/* ---------- 图片与说明 ---------- */
.page-about .ab-figure {
  margin: clamp(26px, 3.6vw, 44px) 0 0;
}

.page-about .ab-figure__cap {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist-400);
}

.page-about .ab-role-figure {
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  max-width: 520px;
}

/* ---------- 团队分工 ---------- */
.page-about .ab-roles {
  display: grid;
  gap: 0;
  margin-top: clamp(26px, 3.6vw, 44px);
  border-top: var(--bw) solid var(--line-600);
  border-left: var(--bw) solid var(--line-600);
}

.page-about .ab-role {
  position: relative;
  border-right: var(--bw) solid var(--line-600);
  border-bottom: var(--bw) solid var(--line-600);
  padding: clamp(20px, 3vw, 32px);
  background: var(--charcoal-900);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .ab-role:hover,
.page-about .ab-role:focus-within {
  background: var(--ink-green-800);
  box-shadow: var(--shadow-hard-sm);
}

.page-about .ab-role__num {
  display: block;
  font-family: var(--font-data);
  font-weight: 800;
  font-size: clamp(44px, 7vw, 72px);
  line-height: .9;
  letter-spacing: -.05em;
  color: var(--paper-050);
  transition: color var(--dur) var(--ease);
}

.page-about .ab-role:hover .ab-role__num,
.page-about .ab-role:focus-within .ab-role__num {
  color: var(--ember-500);
}

.page-about .ab-role__name {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(18px, 2.2vw, 24px);
  letter-spacing: -.01em;
  color: var(--paper-050);
}

.page-about .ab-role__brief {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist-400);
}

.page-about .ab-role__more {
  overflow: hidden;
  max-height: none;
  opacity: 1;
  margin-top: 12px;
}

.page-about .ab-role__more p {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line-600);
  font-size: 14px;
  line-height: 1.75;
  color: var(--paper-050);
}

.page-about .ab-role__hint {
  display: none;
  margin-top: 12px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--lime-500);
}

@media (hover: hover) and (pointer: fine) {
  .page-about .ab-role__more {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease), margin-top var(--dur) var(--ease);
  }

  .page-about .ab-role:hover .ab-role__more,
  .page-about .ab-role:focus-within .ab-role__more {
    max-height: 260px;
    opacity: 1;
    margin-top: 12px;
  }

  .page-about .ab-role__hint {
    display: block;
  }

  .page-about .ab-role:hover .ab-role__hint,
  .page-about .ab-role:focus-within .ab-role__hint {
    visibility: hidden;
  }
}

/* ---------- 年份带与版本 ---------- */
.page-about .ab-years {
  list-style: none;
  margin: clamp(26px, 3.6vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: var(--bw-3) solid var(--line-600);
  border-left: var(--bw) solid var(--line-600);
}

.page-about .ab-years > li {
  display: block;
  min-width: 0;
}

.page-about .ab-year {
  display: block;
  position: relative;
  min-height: 100%;
  padding: 20px clamp(14px, 2vw, 22px) 22px;
  border-right: var(--bw) solid var(--line-600);
  border-bottom: var(--bw) solid var(--line-600);
  text-decoration: none;
  color: inherit;
  transition: background var(--dur-fast) var(--ease);
}

.page-about .ab-year::before {
  content: "";
  position: absolute;
  left: clamp(14px, 2vw, 22px);
  top: 27px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--lime-500);
  box-shadow: 0 0 0 3px rgba(201, 242, 74, .16);
}

.page-about .ab-year__y,
.page-about .ab-year__t {
  display: block;
  margin-left: 22px;
}

.page-about .ab-year__y {
  font-family: var(--font-data);
  font-weight: 800;
  font-size: clamp(20px, 2.6vw, 28px);
  letter-spacing: -.03em;
  color: var(--paper-050);
  transition: color var(--dur-fast) var(--ease);
}

.page-about .ab-year__t {
  margin-top: 8px;
  font-size: 13px;
  color: var(--mist-400);
}

.page-about .ab-year:hover,
.page-about .ab-year:focus-visible {
  background: var(--ink-green-800);
}

.page-about .ab-year:hover .ab-year__y,
.page-about .ab-year:focus-visible .ab-year__y {
  color: var(--lime-500);
}

.page-about .ab-versions {
  display: grid;
  gap: clamp(16px, 2.2vw, 26px);
  margin-top: clamp(26px, 3.6vw, 44px);
}

.page-about .ab-ver {
  border-left: var(--bw-3) solid var(--line-600);
  padding: 4px 0 4px clamp(16px, 2.4vw, 28px);
  scroll-margin-top: 140px;
  transition: border-color var(--dur) var(--ease);
}

.page-about .ab-ver:target {
  border-left-color: var(--lime-500);
}

.page-about .ab-ver__year {
  display: block;
  font-family: var(--font-data);
  font-weight: 800;
  font-size: 13px;
  letter-spacing: .2em;
  color: var(--ember-500);
}

.page-about .ab-ver__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(20px, 2.4vw, 28px);
  letter-spacing: -.01em;
  color: var(--paper-050);
}

.page-about .ab-ver__text {
  margin: 10px 0 0;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist-400);
}

/* ---------- 覆盖与伙伴 ---------- */
.page-about .ab-cities {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
}

.page-about .ab-city {
  border: var(--bw) solid var(--line-600);
  padding: 7px 14px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--paper-050);
  transition: border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}

.page-about .ab-city:hover {
  border-color: var(--lime-500);
  color: var(--lime-500);
}

.page-about .ab-partners {
  display: grid;
  gap: 0;
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  border-top: var(--bw) solid var(--line-600);
  border-left: var(--bw) solid var(--line-600);
}

.page-about .ab-partner {
  border-right: var(--bw) solid var(--line-600);
  border-bottom: var(--bw) solid var(--line-600);
  padding: clamp(18px, 2.4vw, 26px);
}

.page-about .ab-partner dt {
  font-family: var(--font-data);
  font-weight: 800;
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--lime-500);
}

.page-about .ab-partner dd {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--paper-050);
}

/* ---------- 服务准则 ---------- */
.page-about .ab-criteria {
  margin-top: clamp(26px, 3.6vw, 44px);
  border-top: var(--bw) solid var(--line-600);
}

.page-about .ab-criteria__item {
  border-bottom: var(--bw) solid var(--line-600);
}

.page-about .ab-criteria__item > summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  cursor: pointer;
  list-style: none;
  padding: clamp(16px, 2.4vw, 24px) 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(19px, 2.5vw, 28px);
  letter-spacing: -.01em;
  color: var(--paper-050);
  transition: color var(--dur-fast) var(--ease);
}

.page-about .ab-criteria__item > summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-criteria__item > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-data);
  font-weight: 400;
  font-size: 22px;
  color: var(--lime-500);
}

.page-about .ab-criteria__item[open] > summary::after {
  content: "–";
}

.page-about .ab-criteria__item > summary:hover,
.page-about .ab-criteria__item > summary:focus-visible {
  color: var(--lime-500);
}

.page-about .ab-criteria__idx {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--mist-400);
}

.page-about .ab-criteria__body {
  padding: 0 0 clamp(18px, 2.6vw, 28px);
}

.page-about .ab-criteria__body p {
  margin: 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist-400);
}

/* ---------- 引用与认可 ---------- */
.page-about .ab-quote {
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  border-left: 3px solid var(--ember-500);
  padding: 4px 0 4px clamp(16px, 2.4vw, 28px);
  max-width: 46ch;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(19px, 2.6vw, 28px);
  line-height: 1.55;
  letter-spacing: .01em;
  color: var(--paper-050);
}

.page-about .ab-recog__grid {
  display: grid;
  gap: clamp(14px, 2vw, 22px);
  margin-top: clamp(26px, 3.6vw, 44px);
}

.page-about .panel {
  color: var(--paper-050);
}

.page-about .panel__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(18px, 2.1vw, 22px);
  letter-spacing: -.01em;
}

.page-about .panel__meta {
  margin: 10px 0 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--lime-500);
}

.page-about .panel p:last-child {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist-400);
}

/* ---------- 收束行动区 ---------- */
.page-about .ab-next {
  border: var(--bw-3) solid var(--line-600);
  padding: clamp(22px, 3.6vw, 44px);
  background: linear-gradient(135deg, var(--ink-green-800) 0%, var(--charcoal-900) 100%);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-next p {
  margin: clamp(16px, 2.2vw, 22px) 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist-400);
}

.page-about .ab-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 2.8vw, 30px);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .ab-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 940px) {
  .page-about .ab-cols {
    grid-template-columns: minmax(0, 1fr) 300px;
  }

  .page-about .ab-versions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(20px, 2.6vw, 34px) clamp(24px, 3.2vw, 48px);
  }
}

@media (max-width: 719px) {
  .page-about .ab-band__note {
    flex-basis: 100%;
  }

  .page-about .ab-hero__frame {
    box-shadow: var(--shadow-hard-sm);
  }

  .page-about .ab-next {
    box-shadow: var(--shadow-hard-sm);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-role,
  .page-about .ab-role__num,
  .page-about .ab-year,
  .page-about .ab-year__y,
  .page-about .ab-city,
  .page-about .ab-ver,
  .page-about .ab-criteria__item > summary {
    transition: none;
  }
}