.page-about {
  --ab-rule: 2px;
  --ab-gutter: clamp(18px, 4vw, 40px);
  --ab-shadow-hard: 6px 6px 0 rgba(10, 26, 51, 0.16);
  --ab-shadow-hover: 8px 8px 0 rgba(10, 26, 51, 0.22);
  background: var(--paper);
  color: var(--graphite);
  overflow-x: clip;
}

/* ---------- 面包屑条 ---------- */
.page-about .ab-topbar {
  background: var(--ink);
  border-bottom: var(--ab-rule) solid var(--lava);
  padding: 9px 0;
}

.page-about .ab-crumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
}

.page-about .ab-crumb li + li::before {
  content: "/";
  margin-right: 10px;
  color: var(--lava);
}

.page-about .ab-crumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) linear, border-color var(--t-fast) linear;
}

.page-about .ab-crumb a:hover,
.page-about .ab-crumb a:focus-visible {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

.page-about .ab-crumb [aria-current="page"] {
  color: var(--paper-lite);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(38px, 7vw, 84px) 0 clamp(42px, 6vw, 76px);
  background:
    radial-gradient(1120px 540px at 82% -12%, rgba(255, 90, 31, 0.3), transparent 62%),
    radial-gradient(760px 460px at 8% 112%, rgba(31, 211, 232, 0.18), transparent 60%),
    var(--ink);
  color: var(--paper-lite);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    -45deg,
    rgba(243, 235, 221, 0.055) 0 2px,
    transparent 2px 15px
  );
  pointer-events: none;
}

.page-about .ab-hero__frame {
  position: relative;
  z-index: 1;
  border: var(--ab-rule) solid rgba(243, 235, 221, 0.22);
  padding: clamp(22px, 4vw, 46px);
}

.page-about .ab-hero__title {
  margin: 14px 0 18px;
  font-size: clamp(1.9rem, 5.6vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  max-width: 18em;
}

.page-about .ab-hero__lead {
  margin: 0 0 26px;
  max-width: 46ch;
  font-size: var(--fs-17);
  line-height: 1.8;
  color: rgba(243, 235, 221, 0.86);
}

.page-about .ab-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 14px;
  margin: 0 0 30px;
  padding-top: 22px;
  border-top: 1px solid rgba(243, 235, 221, 0.18);
}

.page-about .ab-fact {
  border-left: var(--ab-rule) solid var(--lava);
  padding-left: 12px;
  min-width: 0;
}

.page-about .ab-fact__num {
  display: block;
  font-size: var(--fs-30);
  font-weight: 700;
  line-height: 1;
  color: var(--signal);
}

.page-about .ab-fact__label {
  display: block;
  margin-top: 6px;
  font-size: var(--fs-12);
  line-height: 1.5;
  color: var(--mist);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 章节通用 ---------- */
.page-about .ab-chapter {
  position: relative;
  padding: clamp(46px, 7vw, 90px) 0;
}

.page-about .ab-chapter--ink {
  background: var(--ink);
  color: var(--paper);
  border-top: var(--ab-rule) solid var(--lava);
}

.page-about .ab-chapter--paper {
  background: var(--paper);
  color: var(--graphite);
  border-top: var(--ab-rule) solid var(--ink);
}

.page-about .ab-chapter--band {
  background: var(--ink-deep);
  color: var(--paper);
  border-top: var(--ab-rule) solid var(--cyan);
}

.page-about .ab-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .ab-body {
  order: 1;
  min-width: 0;
}

.page-about .ab-note {
  order: 2;
  min-width: 0;
}

.page-about .ab-coord {
  order: 3;
  min-width: 0;
}

.page-about .ab-title {
  margin: 10px 0 20px;
  font-size: clamp(1.7rem, 4.6vw, 2.75rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
}

.page-about .ab-text {
  margin: 0 0 18px;
  max-width: 38em;
  font-size: var(--fs-17);
  line-height: 1.8;
}

.page-about .ab-text--tight {
  margin-top: 24px;
  font-size: var(--fs-14);
  line-height: 1.8;
}

.page-about .ab-chapter--ink .ab-text,
.page-about .ab-chapter--band .ab-text {
  color: rgba(243, 235, 221, 0.84);
}

.page-about .ab-chapter--paper .ab-text {
  color: var(--graphite);
}

/* ---------- 旁注轨 ---------- */
.page-about .ab-note {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  line-height: 1.75;
  border-top: var(--ab-rule) solid var(--lava);
  padding-top: 10px;
}

.page-about .ab-chapter--paper .ab-note {
  color: var(--graphite);
}

.page-about .ab-chapter--ink .ab-note,
.page-about .ab-chapter--band .ab-note {
  color: var(--mist);
}

.page-about .ab-note__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--lava);
}

.page-about .ab-chapter--ink .ab-note__summary,
.page-about .ab-chapter--band .ab-note__summary {
  color: var(--signal);
}

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

.page-about .ab-note__summary::after {
  content: "+";
  font-weight: 700;
}

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

.page-about .ab-note__body {
  padding-top: 8px;
}

.page-about .ab-note__body p {
  margin: 0;
}

/* ---------- 坐标索引 ---------- */
.page-about .ab-coord {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  border-left: var(--ab-rule) solid var(--mist);
  padding-left: 12px;
}

.page-about .ab-coord__k {
  margin: 0 0 2px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .ab-coord__v {
  margin: 0 0 14px;
  font-weight: 700;
  color: var(--lava-deep);
}

.page-about .ab-chapter--ink .ab-coord__v,
.page-about .ab-chapter--band .ab-coord__v {
  color: var(--lava);
}

/* ---------- 媒体区 ---------- */
.page-about .ab-media-wrap {
  margin-top: clamp(28px, 5vw, 52px);
}

.page-about .ab-media-wrap .bd-media {
  border: var(--ab-rule) solid var(--ink-deep);
  box-shadow: var(--ab-shadow-hard);
}

.page-about .ab-chapter--ink .ab-media-wrap .bd-media,
.page-about .ab-chapter--band .ab-media-wrap .bd-media {
  border-color: rgba(243, 235, 221, 0.24);
  box-shadow: 6px 6px 0 var(--lava-deep);
}

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

/* ---------- 生产流程 ---------- */
.page-about .ab-flow {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .ab-flow__step {
  position: relative;
  padding: 20px 0 20px 55px;
  border-top: 1px solid rgba(57, 65, 90, 0.2);
}

.page-about .ab-flow__step:last-child {
  border-bottom: 1px solid rgba(57, 65, 90, 0.2);
}

.page-about .ab-flow__no {
  position: absolute;
  left: 0;
  top: 21px;
  font-size: var(--fs-22);
  font-weight: 700;
  line-height: 1;
  color: var(--lava-deep);
}

.page-about .ab-flow__title {
  margin: 0 0 6px;
  font-size: var(--fs-22);
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .ab-flow__text {
  margin: 0;
  max-width: 36em;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--graphite);
}

/* ---------- 覆盖版图 ---------- */
.page-about .ab-map {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: clamp(26px, 5vw, 46px);
  border: var(--ab-rule) solid var(--cyan-deep);
  background: linear-gradient(142deg, #061223 0%, #0a1a33 54%, #11243f 100%);
  box-shadow: 6px 6px 0 rgba(255, 90, 31, 0.35);
}

.page-about .ab-map__visual {
  position: relative;
  overflow: hidden;
  border-bottom: var(--ab-rule) solid var(--cyan-deep);
}

.page-about .ab-map__visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 100%;
  min-height: 220px;
  object-fit: cover;
  opacity: 0.9;
}

.page-about .ab-map__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(31, 211, 232, 0.16), rgba(255, 90, 31, 0.18));
  pointer-events: none;
}

.page-about .ab-map__panel {
  padding: 20px 18px 22px;
  background-image: radial-gradient(circle, rgba(31, 211, 232, 0.3) 1.4px, transparent 1.5px);
  background-size: 24px 24px;
  background-position: 6px 8px;
}

.page-about .ab-map__title {
  margin: 0 0 14px;
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--signal);
}

.page-about .ab-map__legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px 20px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  line-height: 1.5;
}

.page-about .ab-map__legend li {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--paper);
}

.page-about .ab-map__legend li::before {
  content: "";
  flex: none;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(31, 211, 232, 0.18);
}

.page-about .ab-map__legend li[data-tone="lava"]::before {
  background: var(--lava);
  box-shadow: 0 0 0 3px rgba(255, 90, 31, 0.22);
}

.page-about .ab-map__legend li[data-tone="signal"]::before {
  background: var(--signal);
  box-shadow: 0 0 0 3px rgba(255, 197, 49, 0.22);
}

.page-about .ab-map__foot {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px dashed rgba(199, 192, 178, 0.4);
  font-size: var(--fs-12);
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 栏目结构 ---------- */
.page-about .ab-columns {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about .ab-columns__item {
  padding: 16px 0 16px 16px;
  border-left: var(--ab-rule) solid var(--mist);
  border-bottom: 1px solid rgba(57, 65, 90, 0.18);
}

.page-about .ab-columns__item:first-child {
  border-top: 1px solid rgba(57, 65, 90, 0.18);
}

.page-about .ab-columns__name {
  margin: 0 0 6px;
  font-size: var(--fs-17);
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .ab-columns__item:hover {
  border-left-color: var(--lava);
}

.page-about .ab-columns__desc {
  margin: 0;
  max-width: 40em;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--graphite);
}

/* ---------- 版本刻度 ---------- */
.page-about .ab-track {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-track__item {
  position: relative;
  padding-left: 26px;
  border-left: var(--ab-rule) solid rgba(243, 235, 221, 0.32);
}

.page-about .ab-track__item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 20px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--lava);
  box-shadow: 0 0 0 4px rgba(255, 90, 31, 0.16);
}

.page-about .ab-ver {
  background: var(--paper-lite);
  border: var(--ab-rule) solid var(--ink-deep);
  box-shadow: 6px 6px 0 var(--lava-deep);
}

.page-about .ab-ver__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-ver__tag {
  flex: none;
  padding: 3px 8px;
  background: var(--ink);
  color: var(--signal);
  font-size: var(--fs-14);
  font-weight: 700;
}

.page-about .ab-ver__name {
  font-weight: 700;
  font-size: var(--fs-17);
  color: var(--ink);
}

.page-about .ab-ver__hint {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--lava-deep);
}

.page-about .ab-ver:not([open]) .ab-ver__hint::after {
  content: " +";
}

.page-about .ab-ver[open] .ab-ver__hint::after {
  content: " –";
}

.page-about .ab-ver__body {
  padding: 0 16px 16px;
  border-top: 1px solid rgba(10, 26, 51, 0.14);
  padding-top: 12px;
}

.page-about .ab-ver__body p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--graphite);
}

/* ---------- 团队 ---------- */
.page-about .ab-crew {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 26px;
}

.page-about .ab-crew__card {
  background: var(--paper-lite);
  border: var(--ab-rule) solid var(--ink);
  border-top: 6px solid var(--lava);
  padding: 18px 18px 20px;
  box-shadow: var(--ab-shadow-hard);
  transition: box-shadow var(--t-fast) linear, transform var(--t-fast) linear;
}

.page-about .ab-crew__card:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--ab-shadow-hover);
}

.page-about .ab-crew__n {
  display: block;
  font-size: var(--fs-44);
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
}

.page-about .ab-crew__role {
  margin: 10px 0 8px;
  font-size: var(--fs-17);
  color: var(--ink);
}

.page-about .ab-crew__desc {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--graphite);
}

/* ---------- 更正机制 ---------- */
.page-about .ab-mail {
  font-family: var(--font-mono);
  font-size: 0.95em;
  font-weight: 700;
  color: var(--signal);
  border-bottom: 1px solid rgba(255, 197, 49, 0.5);
  word-break: break-all;
}

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

/* ---------- 合作生态 ---------- */
.page-about .ab-eco {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .ab-eco__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 18px;
  background: var(--paper-lite);
  border: var(--ab-rule) solid var(--ink);
  border-left: 6px solid var(--cyan-deep);
}

.page-about .ab-eco__n {
  font-size: var(--fs-44);
  font-weight: 700;
  line-height: 0.95;
  color: var(--lava-deep);
}

.page-about .ab-eco__name {
  margin: 0 0 6px;
  font-size: var(--fs-17);
  color: var(--ink);
}

.page-about .ab-eco__desc {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--graphite);
}

/* ---------- 收束 ---------- */
.page-about .ab-coda {
  padding: clamp(48px, 7vw, 88px) 0 clamp(40px, 6vw, 72px);
  background:
    linear-gradient(-90deg, rgba(255, 90, 31, 0.16), transparent 55%),
    var(--ink-deep);
  color: var(--paper);
  border-top: var(--ab-rule) solid var(--lava);
}

.page-about .ab-coda__title {
  margin: 12px 0 18px;
  font-size: clamp(1.6rem, 4.4vw, 2.5rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--paper-lite);
}

.page-about .ab-coda__text {
  margin: 0;
  max-width: 40em;
  font-size: var(--fs-17);
  line-height: 1.8;
  color: rgba(243, 235, 221, 0.84);
}

.page-about .ab-coda__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0 0;
}

.page-about .ab-coda__legal {
  margin: 26px 0 0;
  padding-top: 16px;
  border-top: 1px solid rgba(243, 235, 221, 0.18);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--mist);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .ab-map__legend {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .ab-grid {
    grid-template-columns: 180px minmax(0, 1fr) 126px;
    column-gap: 34px;
  }

  .page-about .ab-note {
    order: 1;
  }

  .page-about .ab-body {
    order: 2;
  }

  .page-about .ab-coord {
    order: 3;
    position: sticky;
    top: 84px;
    align-self: start;
  }

  .page-about .ab-note {
    position: sticky;
    top: 84px;
    align-self: start;
  }

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

  .page-about .ab-note > .ab-note__body {
    display: block !important;
  }

  .page-about .ab-map {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }

  .page-about .ab-map__visual {
    border-bottom: none;
    border-right: var(--ab-rule) solid var(--cyan-deep);
  }

  .page-about .ab-flow__step {
    padding-left: 72px;
  }

  .page-about .ab-flow__no {
    font-size: var(--fs-30);
  }

  .page-about .ab-eco {
    gap: 22px;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-grid {
    grid-template-columns: 200px minmax(0, 1fr) 140px;
    column-gap: 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-crew__card {
    transition: none;
  }

  .page-about .ab-crew__card:hover {
    transform: none;
  }
}