.page-about {
  --ab-rule: 1px solid var(--jk-line);
  --ab-rule-gold: 1px solid rgba(201, 162, 39, 0.45);
  background: var(--jk-ink);
  color: var(--jk-text);
  font-family: var(--jk-font-sans);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  border-bottom: var(--ab-rule);
}

.page-about .ab-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .ab-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: brightness(0.3) saturate(0.5);
}

.page-about .ab-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(31, 94, 78, 0.34) 1px, transparent 1px),
    linear-gradient(90deg, rgba(31, 94, 78, 0.34) 1px, transparent 1px);
  background-size: 64px 64px;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 140px;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(transparent, var(--jk-ink));
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 2;
  padding-block: clamp(36px, 7vw, 88px) clamp(48px, 8vw, 96px);
}

.page-about .ab-crumbs {
  font-family: var(--jk-font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--jk-muted);
  margin-bottom: clamp(20px, 4vw, 40px);
}

.page-about .ab-hero__frame {
  position: relative;
  border: var(--ab-rule-gold);
  padding: clamp(22px, 4.5vw, 52px);
  background: rgba(6, 23, 19, 0.55);
}

.page-about .ab-hero__frame::before,
.page-about .ab-hero__frame::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border: 2px solid var(--jk-gold);
  pointer-events: none;
}

.page-about .ab-hero__frame::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .ab-hero__frame::after {
  bottom: -1px;
  right: -1px;
  border-left: 0;
  border-top: 0;
}

.page-about .ab-hero__kicker {
  margin: 0 0 18px;
  font-family: var(--jk-font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--jk-gold);
}

.page-about .ab-hero__title {
  margin: 0;
  font-size: clamp(2rem, 5.6vw, 4.2rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 800;
  max-width: 18em;
}

.page-about .ab-hero__lede {
  margin: clamp(18px, 3vw, 30px) 0 0;
  max-width: 40em;
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  line-height: 1.8;
  color: var(--jk-text);
}

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--jk-line);
  border: var(--ab-rule);
}

.page-about .ab-stat {
  background: rgba(6, 23, 19, 0.8);
  padding: 14px 16px;
}

.page-about .ab-stat__num {
  display: block;
  font-family: var(--jk-font-mono);
  font-size: clamp(1.25rem, 2.4vw, 1.75rem);
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--jk-gold);
}

.page-about .ab-stat__label {
  display: block;
  margin-top: 6px;
  font-family: var(--jk-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--jk-muted);
}

/* ---------- 主体两栏 ---------- */
.page-about .ab-body {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  padding-block: clamp(36px, 6vw, 80px);
}

.page-about .ab-rail__title {
  margin: 0 0 10px;
  font-family: var(--jk-font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--jk-muted);
}

.page-about .ab-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .ab-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: var(--ab-rule);
  color: var(--jk-muted);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: color var(--jk-ease), border-color var(--jk-ease), background-color var(--jk-ease);
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  color: var(--jk-gold-lite);
  border-color: var(--jk-gold);
}

.page-about .ab-rail__link.is-current {
  color: var(--jk-gold);
  border-color: var(--jk-gold);
  background: rgba(201, 162, 39, 0.08);
}

.page-about .ab-rail__num {
  font-family: var(--jk-font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--jk-vermilion);
}

/* ---------- 章节 ---------- */
.page-about .ab-sec {
  padding-block: clamp(32px, 5vw, 60px);
  border-top: var(--ab-rule);
}

.page-about .ab-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

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

.page-about .ab-sec__head {
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .ab-sec__head .jk-sec-num {
  font-family: var(--jk-font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--jk-vermilion);
  margin: 0 0 10px;
}

.page-about .ab-sec__head .jk-sec-title {
  margin: 0;
  font-size: clamp(1.5rem, 3.2vw, 2.25rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  font-weight: 800;
}

.page-about .ab-lede {
  margin: 0 0 clamp(20px, 3vw, 32px);
  max-width: 44em;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--jk-text);
}

.page-about .ab-prose p {
  margin: 0 0 1.1em;
  line-height: 1.8;
}

.page-about .ab-prose a {
  color: var(--jk-gold-lite);
  text-decoration: none;
  border-bottom: 1px solid rgba(227, 197, 103, 0.5);
}

.page-about .ab-prose a:hover {
  color: var(--jk-gold);
}

.page-about .ab-cols {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

.page-about .ab-note {
  border: var(--ab-rule);
  border-left: 3px solid var(--jk-gold);
  background: var(--jk-panel);
  padding: 20px 22px;
}

.page-about .ab-note__k {
  margin: 0 0 10px;
  font-family: var(--jk-font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--jk-gold);
}

.page-about .ab-note__v {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--jk-text);
}

.page-about .ab-note__m {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: var(--ab-rule);
  font-family: var(--jk-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--jk-muted);
}

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

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--jk-line);
}

.page-about .ab-tl {
  position: relative;
  padding: 0 0 clamp(20px, 3vw, 30px);
  outline: none;
}

.page-about .ab-tl__dot {
  position: absolute;
  left: -30px;
  top: 6px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--jk-gold);
  background: var(--jk-ink);
}

.page-about .ab-tl__dot::after {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: 50%;
  background: var(--jk-vermilion);
}

.page-about .ab-tl:hover .ab-tl__dot,
.page-about .ab-tl:focus-within .ab-tl__dot {
  border-color: var(--jk-gold-lite);
  box-shadow: 0 0 0 4px rgba(201, 162, 39, 0.14);
}

.page-about .ab-tl__year {
  margin: 0 0 4px;
  font-family: var(--jk-font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--jk-gold);
}

.page-about .ab-tl__name {
  margin: 0 0 6px;
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-about .ab-tl__desc {
  margin: 0;
  max-width: 40em;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--jk-muted);
}

.page-about .ab-tl__more {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--jk-text);
  transition: max-height var(--jk-ease), opacity var(--jk-ease), margin var(--jk-ease);
}

.page-about .ab-tl:hover .ab-tl__more,
.page-about .ab-tl:focus-within .ab-tl__more {
  max-height: 120px;
  opacity: 1;
  margin-top: 10px;
}

.page-about .ab-tl--now .ab-tl__year {
  color: var(--jk-vermilion);
}

.page-about .ab-tl--now .ab-tl__dot {
  border-color: var(--jk-vermilion);
}

/* ---------- 团队 ---------- */
.page-about .ab-cols--team {
  align-items: start;
}

.page-about .ab-team__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--ab-rule);
}

.page-about .ab-team__item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 12px;
  padding: 18px 0;
  border-bottom: var(--ab-rule);
}

.page-about .ab-team__num {
  font-family: var(--jk-font-mono);
  font-size: 1.25rem;
  letter-spacing: 0.04em;
  color: var(--jk-line);
}

.page-about .ab-team__name {
  margin: 0 0 6px;
  font-size: 1.0625rem;
  font-weight: 700;
}

.page-about .ab-team__tag {
  display: inline-block;
  margin: 0 0 10px;
  padding: 3px 8px;
  border: 1px solid rgba(201, 162, 39, 0.5);
  font-family: var(--jk-font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--jk-gold);
}

.page-about .ab-team__desc {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--jk-muted);
}

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

.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 坐标体系 ---------- */
.page-about .ab-atlas__figure {
  margin: 0;
  border: var(--ab-rule);
  background: var(--jk-panel);
  padding: 16px;
}

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

.page-about .ab-svg__grid line {
  stroke: var(--jk-line);
  stroke-width: 1;
  opacity: 0.5;
}

.page-about .ab-svg__links path {
  fill: none;
  stroke: var(--jk-line);
  stroke-width: 1;
  stroke-dasharray: 4 6;
}

.page-about .ab-dot {
  fill: var(--jk-gold);
  transition: fill var(--jk-ease), r var(--jk-ease);
}

.page-about .ab-dot:hover {
  fill: var(--jk-vermilion);
  r: 9;
}

/* ---------- 数据来源 ---------- */
.page-about .ab-data {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--jk-line);
  border: var(--ab-rule);
}

.page-about .ab-data__item {
  background: var(--jk-panel);
  padding: 20px 22px;
}

.page-about .ab-data__k {
  margin: 0;
  font-family: var(--jk-font-mono);
  font-size: 1.9rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--jk-gold);
}

.page-about .ab-data__t {
  margin: 8px 0 10px;
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .ab-data__d {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--jk-muted);
}

/* ---------- 更新节奏 ---------- */
.page-about .ab-cadence {
  border-top: var(--ab-rule);
}

.page-about .ab-cadence__row {
  display: grid;
  gap: 4px;
  padding: 18px 0;
  border-bottom: var(--ab-rule);
}

.page-about .ab-cadence__label {
  margin: 0;
  font-family: var(--jk-font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--jk-muted);
}

.page-about .ab-cadence__value {
  margin: 0;
  font-family: var(--jk-font-mono);
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--jk-gold);
}

.page-about .ab-cadence__desc {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--jk-text);
}

.page-about .ab-cadence__desc a {
  color: var(--jk-gold-lite);
  text-decoration: none;
  border-bottom: 1px solid rgba(227, 197, 103, 0.5);
}

.page-about .ab-case {
  margin-top: clamp(22px, 3vw, 34px);
  padding: 22px 24px;
  border: var(--ab-rule);
  border-left: 3px solid var(--jk-vermilion);
  background: rgba(6, 23, 19, 0.7);
}

.page-about .ab-case__k {
  margin: 0 0 8px;
  font-family: var(--jk-font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--jk-vermilion);
}

.page-about .ab-case__t {
  margin: 0 0 10px;
  font-size: 1.0625rem;
  font-weight: 700;
}

.page-about .ab-case__d {
  margin: 0;
  max-width: 46em;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--jk-muted);
}

/* ---------- 合作 ---------- */
.page-about .ab-partner {
  border: var(--ab-rule-gold);
  background: linear-gradient(160deg, var(--jk-panel), rgba(11, 43, 36, 0.9));
  padding: clamp(24px, 5vw, 48px);
}

.page-about .ab-partner__kicker {
  margin: 0 0 12px;
  font-family: var(--jk-font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--jk-gold);
}

.page-about .ab-partner__title {
  margin: 0 0 16px;
  font-size: clamp(1.5rem, 3.4vw, 2.125rem);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .ab-partner__lede {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 42em;
  font-size: 1rem;
  line-height: 1.8;
}

.page-about .ab-partner__list {
  display: grid;
  gap: 14px;
  margin: 0 0 clamp(22px, 3vw, 32px);
  padding: 0;
  list-style: none;
}

.page-about .ab-partner__item {
  padding: 16px 18px;
  border: var(--ab-rule);
  background: rgba(6, 23, 19, 0.5);
}

.page-about .ab-partner__name {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--jk-gold-lite);
}

.page-about .ab-partner__desc {
  margin: 0;
  font-size: 0.9125rem;
  line-height: 1.75;
  color: var(--jk-muted);
}

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

.page-about .ab-partner__meta {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding-top: 16px;
  border-top: var(--ab-rule);
  font-family: var(--jk-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--jk-muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .ab-cols {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-cols--team {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }

  .page-about .ab-cols--atlas {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

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

  .page-about .ab-cadence__row {
    grid-template-columns: 140px 180px minmax(0, 1fr);
    align-items: baseline;
    gap: 18px;
  }

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

@media (min-width: 1000px) {
  .page-about .ab-body {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }

  .page-about .ab-rail {
    position: sticky;
    top: 96px;
  }

  .page-about .ab-rail__list {
    flex-direction: column;
    gap: 6px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .ab-rail__link {
    width: 100%;
    box-sizing: border-box;
  }

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

@media (max-width: 999px) {
  .page-about .ab-tl__more {
    max-height: none;
    opacity: 1;
    margin-top: 10px;
  }

  .page-about .ab-hero::after {
    height: 90px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-rail__link,
  .page-about .ab-tl__more,
  .page-about .ab-dot {
    transition: none;
  }
}