.page-about {
  --ab-paper-ink: #1A2420;
  --ab-paper-muted: #4A5A52;
  --ab-hair: rgba(217, 205, 180, 0.16);
  --ab-hair-dark: rgba(26, 36, 32, 0.14);
  --ab-max: 780px;
  color: var(--text);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  margin: 0 0 18px;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--muted);
}

.page-about .breadcrumb__item {
  color: var(--muted);
  text-decoration: none;
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 6px;
  color: rgba(157, 176, 166, 0.5);
}

.page-about .breadcrumb__item[aria-current="page"] {
  color: var(--lime-soft);
}

.page-about .breadcrumb__item:hover,
.page-about .breadcrumb__item:focus-visible {
  color: var(--lime);
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 5vw, 52px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--ab-hair);
  background:
    radial-gradient(120% 94% at 100% 0%, rgba(184, 255, 60, 0.18), transparent 58%),
    radial-gradient(96% 84% at 0% 100%, rgba(255, 122, 61, 0.14), transparent 62%),
    var(--ink);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(232, 241, 234, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(232, 241, 234, 0.07) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: linear-gradient(140deg, rgba(0, 0, 0, 0.85), transparent 70%);
  opacity: 0.7;
}

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

.page-about .ab-hero .eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-about .ab-hero h1 {
  margin: 0;
  max-width: 22ch;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(28px, 6.2vw, 50px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: #FFFFFF;
}

.page-about .ab-hero__lede {
  margin: 18px 0 0;
  max-width: 60ch;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.85;
  color: rgba(232, 241, 234, 0.82);
}

.page-about .ab-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-hero__facts li {
  padding-left: 12px;
  border-left: 2px solid var(--orange);
}

.page-about .ab-hero__facts li:first-child {
  border-left-color: var(--lime);
}

.page-about .ab-hero__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 4.4vw, 27px);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.2;
  color: var(--lime-soft);
}

.page-about .ab-hero__label {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 主体双栏 ---------- */

.page-about .ab-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  margin-top: 30px;
}

.page-about .ab-rail {
  min-width: 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--ab-hair);
  background: rgba(16, 20, 22, 0.72);
  padding: 12px 14px;
}

.page-about .ab-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
  text-transform: uppercase;
}

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

.page-about .ab-rail__list li {
  flex: 0 0 auto;
}

.page-about .ab-rail__item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px solid var(--ab-hair);
  background: transparent;
  font-size: 13.5px;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 180ms var(--ease), background 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .ab-rail__item .num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--lime);
}

.page-about .ab-rail__item:hover,
.page-about .ab-rail__item:focus-visible {
  border-color: var(--lime-soft);
  background: rgba(184, 255, 60, 0.09);
  transform: translateY(-2px);
}

.page-about .ab-rail__item:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

.page-about .ab-main {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 26px;
}

/* ---------- 通用章节 ---------- */

.page-about .ab-section {
  min-width: 0;
  padding: clamp(20px, 4vw, 34px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--ab-hair);
  background:
    linear-gradient(168deg, rgba(28, 74, 59, 0.34), rgba(10, 31, 25, 0.1) 62%),
    var(--ink);
}

.page-about .ab-section--paper {
  position: relative;
  overflow: hidden;
  border-color: var(--ab-hair-dark);
  background:
    repeating-linear-gradient(0deg, rgba(26, 36, 32, 0.035) 0 1px, transparent 1px 5px),
    var(--paper);
  color: var(--ab-paper-ink);
}

.page-about .ab-section__head {
  margin-bottom: 18px;
}

.page-about .ab-section__head .eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--lime);
}

.page-about .ab-section--paper .ab-section__head .eyebrow {
  color: #2E6B4E;
}

.page-about .ab-section h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(23px, 4.4vw, 36px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: #FFFFFF;
}

.page-about .ab-section--paper h2 {
  color: var(--ink);
}

.page-about .lede {
  margin: 12px 0 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .ab-prose p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(232, 241, 234, 0.86);
}

.page-about .ab-prose p:last-child {
  margin-bottom: 0;
}

.page-about .ab-section--paper .ab-prose p {
  color: var(--ab-paper-ink);
}

.page-about .ab-prose a,
.page-about .ab-section__link a,
.page-about .ab-node__body a,
.page-about .ab-cta__more a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .ab-section--paper .ab-prose a {
  color: #1F5E42;
}

.page-about .ab-prose a:hover,
.page-about .ab-prose a:focus-visible,
.page-about .ab-node__body a:hover,
.page-about .ab-node__body a:focus-visible {
  color: var(--orange);
}

.page-about .ab-prose a:focus-visible,
.page-about .ab-rail__item:focus-visible,
.page-about .ab-node__head:focus-visible,
.page-about .ab-cta__more a:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
  border-radius: 4px;
}

.page-about .ab-section__link {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ab-paper-muted);
}

/* ---------- 引用块 ---------- */

.page-about .ab-quote {
  position: relative;
  margin: 20px 0 0;
  padding: 18px 18px 18px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--ab-hair-dark);
  border-left: 3px solid var(--orange);
  background: rgba(10, 31, 25, 0.055);
}

.page-about .ab-quote__tag {
  display: inline-block;
  margin-bottom: 8px;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--ink);
  color: var(--lime-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.page-about .ab-quote p {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink);
}

/* ---------- 主题带 ---------- */

.page-about .ab-band {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  padding: clamp(22px, 4.6vw, 38px);
}

.page-about .ab-band--lime {
  background: linear-gradient(118deg, var(--lime) 0%, var(--lime-soft) 46%, var(--orange) 132%);
  color: var(--ink);
}

.page-about .ab-band--lime::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(115deg, rgba(10, 31, 25, 0.08) 0 1px, transparent 1px 14px);
  pointer-events: none;
}

.page-about .ab-band--lime .ab-band__text {
  position: relative;
  margin: 0;
  max-width: 30ch;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(19px, 3.8vw, 28px);
  line-height: 1.45;
  color: var(--ink);
}

.page-about .ab-band--lime .ab-band__meta {
  position: relative;
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(10, 31, 25, 0.7);
}

.page-about .ab-band--dark {
  border: 1px solid var(--ab-hair);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(255, 122, 61, 0.24), transparent 58%),
    var(--coal);
}

.page-about .ab-band__big {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 6vw, 44px);
  letter-spacing: 0.02em;
  color: var(--lime);
}

.page-about .ab-band--dark .ab-band__text {
  margin: 8px 0 0;
  max-width: 40ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(232, 241, 234, 0.84);
}

/* ---------- 图片 ---------- */

.page-about .ab-figure,
.page-about .ab-source__figure,
.page-about .ab-timeline__figure {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--ab-hair);
  background: var(--forest);
}

.page-about .ab-figure {
  margin-bottom: 20px;
}

.page-about .ab-figure img,
.page-about .ab-source__figure img,
.page-about .ab-timeline__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .ab-figure figcaption,
.page-about .ab-source__figure figcaption,
.page-about .ab-timeline__figure figcaption {
  padding: 10px 14px 12px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
  background: rgba(16, 20, 22, 0.55);
}

/* ---------- 三道手 ---------- */

.page-about .ab-steps {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.page-about .ab-step {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 12px;
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--ab-hair);
  background: rgba(18, 53, 43, 0.55);
  transition: border-color 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .ab-step:hover {
  border-color: var(--lime-soft);
  transform: translateY(-2px);
}

.page-about .ab-step__no {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--lime);
  padding-top: 2px;
}

.page-about .ab-step h3 {
  margin: 0 0 6px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 16.5px;
  letter-spacing: -0.01em;
  color: #FFFFFF;
}

.page-about .ab-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(232, 241, 234, 0.8);
}

/* ---------- 分工 ---------- */

.page-about .ab-crew {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .ab-crew__item {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .ab-crew__ring {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  border: 1px solid var(--ab-hair);
  background:
    radial-gradient(circle at 50% 36%, rgba(184, 255, 60, 0.16), transparent 62%),
    var(--forest);
  text-align: center;
  transition: border-color 180ms var(--ease), transform 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .ab-crew__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 6vw, 36px);
  letter-spacing: 0.02em;
  line-height: 1.1;
  color: var(--lime);
}

.page-about .ab-crew__role {
  font-size: 12.5px;
  line-height: 1.4;
  color: rgba(232, 241, 234, 0.78);
}

.page-about .ab-crew__item:hover .ab-crew__ring,
.page-about .ab-crew__item:focus-within .ab-crew__ring {
  border-color: var(--lime-soft);
  transform: translateY(-2px);
  box-shadow: 0 0 0 4px rgba(184, 255, 60, 0.08);
}

.page-about .ab-crew__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
  transition: color 180ms var(--ease);
}

.page-about .ab-crew__item:hover .ab-crew__note,
.page-about .ab-crew__item:focus-within .ab-crew__note {
  color: rgba(232, 241, 234, 0.94);
}

/* ---------- 时间轴 ---------- */

.page-about .ab-timeline {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

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

.page-about .ab-timeline__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
}

.page-about .ab-node {
  border-radius: var(--radius-md);
  border: 1px solid var(--ab-hair);
  background: rgba(18, 53, 43, 0.6);
  overflow: hidden;
  transition: border-color 180ms var(--ease);
}

.page-about .ab-node[open] {
  border-color: rgba(184, 255, 60, 0.4);
  background: rgba(28, 74, 59, 0.62);
}

.page-about .ab-node__head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-sans);
  font-size: 15.5px;
  font-weight: 700;
  color: #FFFFFF;
  transition: background 180ms var(--ease);
}

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

.page-about .ab-node__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--lime);
}

.page-about .ab-node[open] .ab-node__head::after {
  content: "−";
}

.page-about .ab-node__head:hover {
  background: rgba(184, 255, 60, 0.07);
}

.page-about .ab-node__year {
  flex: 0 0 auto;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--orange);
  color: #16100C;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

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

.page-about .ab-node__body {
  padding: 0 16px 16px;
}

.page-about .ab-node__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.9;
  color: rgba(232, 241, 234, 0.84);
}

/* ---------- 数据来源 ---------- */

.page-about .ab-source {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

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

/* ---------- 三条坚持 ---------- */

.page-about .ab-principles {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-principle {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--ab-hair);
  background: linear-gradient(150deg, rgba(28, 74, 59, 0.6), rgba(10, 31, 25, 0.2));
  transition: border-color 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .ab-principle:hover {
  border-color: var(--lime-soft);
  transform: translateY(-2px);
}

.page-about .ab-principle__no {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid rgba(255, 122, 61, 0.55);
  background: rgba(255, 122, 61, 0.12);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 15px;
  color: var(--orange);
}

.page-about .ab-principle h3 {
  margin: 4px 0 6px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.5;
  letter-spacing: -0.01em;
  color: #FFFFFF;
}

.page-about .ab-principle p {
  grid-column: 2;
  margin: 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: rgba(232, 241, 234, 0.78);
}

/* ---------- 结尾 ---------- */

.page-about .ab-cta {
  padding: clamp(22px, 4.6vw, 38px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(184, 255, 60, 0.32);
  background:
    radial-gradient(110% 120% at 0% 0%, rgba(184, 255, 60, 0.16), transparent 56%),
    radial-gradient(90% 110% at 100% 100%, rgba(255, 122, 61, 0.18), transparent 60%),
    var(--forest);
}

.page-about .ab-cta .eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--lime);
}

.page-about .ab-cta h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(22px, 4.2vw, 32px);
  line-height: 1.35;
  color: #FFFFFF;
}

.page-about .ab-cta p {
  margin: 14px 0 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.9;
  color: rgba(232, 241, 234, 0.84);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .ab-cta__more {
  font-size: 13.5px;
  color: var(--muted);
}

.page-about .ab-cta .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  border-radius: 999px;
  font-family: var(--font-sans);
  font-size: 14.5px;
  font-weight: 700;
  text-decoration: none;
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .ab-cta .btn--primary {
  background: var(--lime);
  color: #0A1F19;
  border: 1px solid var(--lime);
}

.page-about .ab-cta .btn--ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid rgba(232, 241, 234, 0.34);
}

.page-about .ab-cta .btn:hover,
.page-about .ab-cta .btn:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(10, 31, 25, 0.5);
}

.page-about .ab-cta .btn--ghost:hover,
.page-about .ab-cta .btn--ghost:focus-visible {
  border-color: var(--lime-soft);
}

.page-about .ab-cta .btn:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

/* ---------- 断点 ---------- */

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

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

  .page-about .ab-source {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .ab-timeline {
    grid-template-columns: minmax(0, 260px) minmax(0, 1fr);
    align-items: start;
    gap: 20px;
  }

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

  .page-about .ab-step {
    grid-template-columns: 56px minmax(0, 1fr);
    padding: 18px 20px;
  }
}

@media (min-width: 1080px) {
  .page-about .ab-shell {
    grid-template-columns: var(--index) minmax(0, 1fr);
    gap: 34px;
    align-items: start;
  }

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

  .page-about .ab-rail__list {
    flex-direction: column;
    overflow: visible;
  }

  .page-about .ab-rail__list li {
    flex: 1 1 auto;
  }

  .page-about .ab-rail__item {
    width: 100%;
    justify-content: flex-start;
    padding: 9px 13px;
  }

  .page-about .ab-main {
    max-width: var(--ab-max);
    gap: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-rail__item,
  .page-about .ab-step,
  .page-about .ab-principle,
  .page-about .ab-crew__ring,
  .page-about .ab-cta .btn {
    transition: none;
  }

  .page-about .ab-rail__item:hover,
  .page-about .ab-step:hover,
  .page-about .ab-principle:hover,
  .page-about .ab-crew__item:hover .ab-crew__ring,
  .page-about .ab-cta .btn:hover {
    transform: none;
  }
}