.page-about {
  --about-index-w: 236px;
  --about-gap: clamp(24px, 3.4vw, 56px);
  --about-rule: rgba(45, 226, 230, 0.16);
  --about-soft: rgba(45, 226, 230, 0.08);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 3vw, 40px) 0 clamp(32px, 5vw, 68px);
  background:
    radial-gradient(120% 100% at 84% -10%, rgba(13, 47, 79, 0.95) 0%, rgba(7, 26, 47, 0) 62%),
    var(--ink-900);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(45, 226, 230, 0.055) 0 1px,
    transparent 1px 84px
  );
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: clamp(10px, 4vw, 60px);
  top: 0;
  width: 1px;
  height: 46px;
  background: linear-gradient(180deg, var(--ember), transparent);
  pointer-events: none;
}

.page-about .about-hero .breadcrumb {
  position: relative;
  z-index: 1;
  margin-bottom: clamp(18px, 3vw, 34px);
  font-size: 13px;
  color: var(--stone);
}

.page-about .about-hero .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-hero .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(140, 154, 155, 0.6);
}

.page-about .about-hero .breadcrumb a {
  color: var(--cyan);
  text-decoration: none;
}

.page-about .about-hero .breadcrumb a:hover,
.page-about .about-hero .breadcrumb a:focus-visible {
  text-decoration: underline;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.2vw, 44px);
  align-items: end;
}

.page-about .about-hero__text {
  min-width: 0;
}

.page-about .about-hero .kicker {
  display: inline-block;
  margin: 0 0 16px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  border: 1px solid rgba(45, 226, 230, 0.4);
  background: rgba(45, 226, 230, 0.06);
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-size: clamp(30px, 5.4vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--paper);
  max-width: 22ch;
}

.page-about .about-hero .lede {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.72;
  color: var(--text);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
  margin: 26px 0 0;
  padding: 18px 0 0;
  border-top: 1px dashed rgba(140, 154, 155, 0.3);
  list-style: none;
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-num__label {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--stone);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  background: var(--ink-700);
  border: 1px solid rgba(45, 226, 230, 0.35);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 26px 100%, 0 calc(100% - 26px));
  overflow: hidden;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 4;
  object-fit: cover;
}

.page-about .about-hero__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-950);
  background: var(--cyan);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  padding: clamp(32px, 4.5vw, 64px) 0 clamp(48px, 6vw, 96px);
}

.page-about .about-index {
  min-width: 0;
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .about-index ol {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 12px;
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-index a {
  display: block;
  padding: 11px 0 11px 12px;
  border-left: 2px solid rgba(45, 226, 230, 0.22);
  font-size: 13.5px;
  line-height: 1.45;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(45, 226, 230, 0.05);
}

.page-about .about-index__stamp {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 6px 12px;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--stone);
  border: 1px solid rgba(201, 162, 39, 0.4);
  background: rgba(201, 162, 39, 0.07);
}

.page-about .about-index__stamp .mono {
  color: var(--gold);
  font-weight: 700;
}

.page-about .about-main {
  min-width: 0;
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding: 0 0 clamp(34px, 4.6vw, 60px);
  margin: 0 0 clamp(34px, 4.6vw, 60px);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-sec:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-sec__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 20px;
}

.page-about .about-sec__num {
  flex: none;
  margin-top: 8px;
  padding: 3px 8px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  border: 1px solid rgba(45, 226, 230, 0.42);
}

.page-about .about-sec h2 {
  margin: 0;
  font-size: clamp(23px, 3.4vw, 37px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-sec p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--text);
  max-width: 64ch;
}

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

.page-about .about-sec a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(45, 226, 230, 0.45);
}

.page-about .about-sec a:hover,
.page-about .about-sec a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------- 旁注卡 ---------- */
.page-about .about-note {
  position: relative;
  margin: 24px 0 0;
  padding: 16px 18px 18px;
  max-width: 56ch;
  background: rgba(184, 107, 75, 0.14);
  border-left: 3px solid var(--clay);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.page-about .about-note__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--clay);
}

.page-about .about-note p:not(.about-note__label) {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: #EADFD8;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 26px 0 0;
  padding: 0 0 0 28px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(45, 226, 230, 0.35) 55%, rgba(45, 226, 230, 0.05) 100%);
}

.page-about .about-timeline > li {
  position: relative;
  padding: 0 0 26px;
}

.page-about .about-timeline > li:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline > li::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--ink-900);
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
}

.page-about .about-timeline__ver {
  margin: 0 0 4px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
  font-weight: 700;
}

.page-about .about-timeline h3 {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-timeline p {
  max-width: 60ch;
  font-size: 15.5px;
}

.page-about .about-timeline__figure-cell::before {
  border-color: var(--gold);
}

/* ---------- 图版 ---------- */
.page-about .about-figure {
  margin: 22px 0;
  background: var(--ink-700);
  border: 1px solid rgba(45, 226, 230, 0.2);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
  overflow: hidden;
}

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

.page-about .about-figure--tall img {
  aspect-ratio: 4 / 3;
}

.page-about .about-figure figcaption {
  padding: 10px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--stone);
  border-top: 1px solid var(--about-rule);
  background: rgba(2, 10, 18, 0.4);
}

/* ---------- 三级校验流程 ---------- */
.page-about .about-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 24px;
}

.page-about .about-flow__step {
  padding: 18px 18px 20px;
  background: var(--ink-700);
  border-top: 2px solid var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .about-flow__tag {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-flow__step h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
  max-width: none;
}

/* ---------- 适配清单 ---------- */
.page-about .about-adapt {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 22px;
}

.page-about .about-adapt__chart {
  padding: 18px;
  background: linear-gradient(160deg, rgba(13, 47, 79, 0.95) 0%, rgba(7, 26, 47, 0.95) 100%);
  border: 1px solid rgba(45, 226, 230, 0.2);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
}

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

.page-about .about-matrix__label text {
  font-family: var(--font-sans);
  font-size: 15px;
  fill: var(--muted);
}

.page-about .about-matrix__dots rect {
  fill: rgba(111, 127, 106, 0.85);
  stroke: rgba(201, 162, 39, 0.55);
  stroke-width: 1;
}

.page-about .about-adapt__total {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed rgba(140, 154, 155, 0.3);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--stone);
  max-width: none;
}

.page-about .about-adapt__total .mono {
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--moss);
}

.page-about .about-adapt__body {
  min-width: 0;
}

/* ---------- 场景卡 ---------- */
.page-about .about-scenes {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 24px;
}

.page-about .about-scene {
  position: relative;
  padding: 20px 18px 22px;
  background: rgba(13, 47, 79, 0.72);
  border-left: 3px solid rgba(255, 90, 54, 0.75);
}

.page-about .about-scene:nth-child(even) {
  border-left-color: rgba(45, 226, 230, 0.7);
}

.page-about .about-scene__tag {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ember);
}

.page-about .about-scene:nth-child(even) .about-scene__tag {
  color: var(--cyan);
}

.page-about .about-scene h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-scene p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
  max-width: none;
}

/* ---------- 可信保障 ---------- */
.page-about .about-trust {
  margin: 24px 0 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-trust__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(140, 154, 155, 0.16);
}

.page-about .about-trust dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .about-trust dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--text);
  max-width: 62ch;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-scenes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-trust__row {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 18px;
    align-items: start;
  }
}

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

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }

  .page-about .about-index ol {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-top: 0;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    align-items: start;
    gap: clamp(32px, 3.6vw, 60px);
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h, 60px) + 28px);
    align-self: start;
  }

  .page-about .about-index ol {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .page-about .about-index a {
    padding: 10px 0 10px 16px;
  }

  .page-about .about-adapt {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: clamp(24px, 3vw, 40px);
    align-items: start;
  }

  .page-about .about-sec h2 {
    max-width: 24ch;
  }
}

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