.page-about {
  --about-gap: clamp(52px, 8vw, 104px);
  --about-line: rgba(0, 230, 118, 0.24);
  position: relative;
  overflow-x: clip;
  color: var(--c-mist);
  font-family: var(--font-body);
  background:
    radial-gradient(120% 60% at 82% -10%, rgba(0, 217, 255, 0.10), transparent 62%),
    linear-gradient(180deg, rgba(0, 230, 118, 0.05), transparent 420px),
    var(--c-space);
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--c-rule) 1px, transparent 1px),
    linear-gradient(to bottom, var(--c-rule) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.34;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.95), transparent 78%);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.95), transparent 78%);
}

.page-about .shell {
  position: relative;
  z-index: 1;
}

.page-about .num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
}

.page-about a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 217, 255, 0.35);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about a:hover,
.page-about a:focus-visible {
  color: var(--c-mint);
  border-bottom-color: var(--c-matrix);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  z-index: 1;
  padding: clamp(104px, 15vw, 168px) 0 clamp(36px, 6vw, 72px);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(22px, 3.4vw, 36px);
  padding: 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-steel);
}

.page-about .breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  color: var(--c-rule);
}

.page-about .breadcrumb a {
  color: var(--c-steel);
  border-bottom: 0;
}

.page-about .breadcrumb a:hover {
  color: var(--c-matrix);
}

.page-about .eyebrow {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--c-steel);
}

.page-about .eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--c-matrix);
}

.page-about h1 {
  margin: 0 0 clamp(20px, 3vw, 32px);
  max-width: 16em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(36px, 8.2vw, 88px);
  line-height: 0.98;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}

.page-about h1::after {
  content: "";
  display: block;
  width: clamp(64px, 14vw, 132px);
  height: 3px;
  margin-top: clamp(20px, 3vw, 30px);
  background: linear-gradient(90deg, var(--c-matrix), rgba(0, 217, 255, 0.7));
}

.page-about .lede {
  max-width: 640px;
  margin: 0;
  font-size: clamp(16px, 1.9vw, 19px);
  line-height: 1.78;
  color: var(--c-mist);
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  margin: clamp(32px, 5vw, 52px) 0 0;
  padding: clamp(20px, 3vw, 26px) 0 0;
  list-style: none;
  border-top: 1px solid var(--c-rule);
}

.page-about .hero-facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .hero-facts .num {
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1;
  color: var(--c-matrix);
}

.page-about .fact-label {
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--c-steel);
}

/* ---------- 主体：索引 + 内容 ---------- */
.page-about .about-body {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 56px);
  padding-bottom: clamp(64px, 10vw, 128px);
}

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

.page-about .index-title {
  margin: 0 0 14px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-steel);
}

.page-about .index-list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .index-list li {
  flex: 0 0 auto;
}

.page-about .index-list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 16px;
  border: 1px solid var(--c-rule);
  border-radius: var(--radius-cap);
  font-size: 13px;
  white-space: nowrap;
  color: var(--c-mist);
  background: rgba(17, 20, 24, 0.6);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .index-list a:hover,
.page-about .index-list a:focus-visible {
  border-color: var(--c-matrix);
  color: var(--c-matrix);
}

.page-about .index-list .num {
  font-size: 11px;
  color: var(--c-steel);
}

/* ---------- 章节 ---------- */
.page-about .about-flow {
  min-width: 0;
}

.page-about .sec {
  position: relative;
  padding-top: var(--about-gap);
  scroll-margin-top: 110px;
}

.page-about .sec:first-child {
  padding-top: clamp(8px, 2vw, 20px);
}

.page-about .sec-num {
  position: absolute;
  top: 0;
  right: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(72px, 16vw, 168px);
  line-height: 0.78;
  letter-spacing: -0.04em;
  color: var(--c-matrix);
  opacity: 0.09;
  pointer-events: none;
  user-select: none;
}

.page-about .sec-kicker {
  margin: 0 0 12px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-about .sec-title {
  position: relative;
  margin: 0 0 18px;
  max-width: 20em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 4vw, 42px);
  line-height: 1.18;
  letter-spacing: 0.005em;
  color: var(--c-paper);
}

.page-about .sec-lede {
  max-width: 620px;
  margin: 0 0 clamp(24px, 3.6vw, 38px);
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.75;
  color: var(--c-steel);
}

.page-about .sec-tail {
  margin: clamp(22px, 3.4vw, 32px) 0 0;
  max-width: 640px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-steel);
}

.page-about .prose {
  max-width: 680px;
  color: var(--c-mist);
}

.page-about .prose p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.82;
}

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

/* ---------- 展签纸条 ---------- */
.page-about .paper-card {
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: clamp(22px, 3.6vw, 34px);
  border-radius: var(--radius-card);
  background: var(--c-paper);
  color: var(--c-space);
  box-shadow: var(--shadow-cap);
}

.page-about .paper-kicker {
  margin: 0 0 16px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #4a5a68;
}

.page-about .paper-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .paper-list li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.7;
}

.page-about .paper-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--c-matrix);
}

/* ---------- 时间线 ---------- */
.page-about .stages {
  position: relative;
  display: grid;
  gap: 30px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .stage {
  position: relative;
  padding-left: 28px;
}

.page-about .stage::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-matrix);
  box-shadow: 0 0 0 4px rgba(0, 230, 118, 0.12);
}

.page-about .stage::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 22px;
  bottom: -30px;
  width: 1px;
  background: var(--c-rule);
}

.page-about .stage:last-child::after {
  display: none;
}

.page-about .stage-ver {
  margin: 0 0 6px;
  font-size: clamp(22px, 3.2vw, 28px);
  line-height: 1;
  color: var(--c-matrix);
}

.page-about .stage-name {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--c-paper);
}

.page-about .stage-text {
  margin: 0;
  max-width: 640px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-steel);
}

/* ---------- 图片 ---------- */
.page-about .shot {
  margin: clamp(28px, 4vw, 44px) 0 0;
  border: 1px solid var(--c-rule);
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--c-carbon);
}

.page-about .shot img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.86) contrast(1.06);
}

.page-about .shot--band img {
  aspect-ratio: 16 / 7;
}

.page-about .shot--tall img {
  aspect-ratio: 3 / 2;
}

.page-about .shot figcaption {
  padding: 12px 16px 14px;
  font-size: 12px;
  line-height: 1.65;
  letter-spacing: 0.03em;
  color: var(--c-steel);
  border-top: 1px solid var(--c-rule);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
}

.page-about .team-grid .shot {
  margin: 0;
}

.page-about .team-split {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(24px, 3.6vw, 34px) 0 0;
  background: var(--c-rule);
  border: 1px solid var(--c-rule);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.page-about .split-item {
  padding: 16px 14px;
  background: rgba(17, 20, 24, 0.78);
}

.page-about .split-item dt {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-steel);
}

.page-about .split-item dd {
  margin: 8px 0 0;
  font-size: clamp(24px, 4vw, 32px);
  line-height: 1;
  color: var(--c-matrix);
}

/* ---------- 分区列表 ---------- */
.page-about .zones {
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--c-rule);
}

.page-about .zone {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 20px 0 22px;
  border-bottom: 1px solid var(--c-rule);
  transition: background var(--dur) var(--ease);
}

.page-about .zone-idx {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-steel);
}

.page-about .zone-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.02em;
  color: var(--c-paper);
}

.page-about .zone-desc {
  font-size: 14px;
  line-height: 1.78;
  color: var(--c-steel);
}

.page-about .zone-link {
  justify-self: start;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-matrix);
  border-bottom: 1px solid rgba(0, 230, 118, 0.4);
}

.page-about .zone:hover .zone-name {
  color: var(--c-mint);
}

/* ---------- 运营 ---------- */
.page-about .ops-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .ops-card {
  padding: 20px 18px;
  border: 1px solid var(--c-rule);
  border-left: 2px solid rgba(0, 230, 118, 0.55);
  border-radius: 12px;
  background: rgba(17, 20, 24, 0.62);
}

.page-about .ops-key {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-steel);
}

.page-about .ops-val {
  margin: 0 0 10px;
  font-size: clamp(18px, 2.6vw, 24px);
  line-height: 1.25;
  color: var(--c-matrix);
  word-break: break-word;
}

.page-about .ops-val--mail,
.page-about .ops-val--addr {
  font-family: var(--font-body);
  font-size: 15px;
  letter-spacing: 0.01em;
  color: var(--c-paper);
}

.page-about .ops-note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-steel);
}

.page-about .ops-prose {
  margin-top: clamp(22px, 3.4vw, 32px);
}

/* ---------- 数字墙 ---------- */
.page-about .sec--numbers {
  padding-bottom: 0;
}

.page-about .num-wall {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: clamp(24px, 3.6vw, 36px);
}

.page-about .plate {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px 20px;
  border: 1px solid var(--c-rule);
  border-radius: 12px;
  background: linear-gradient(180deg, rgba(17, 20, 24, 0.82), rgba(10, 22, 40, 0.55));
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .plate:hover {
  border-color: rgba(0, 230, 118, 0.42);
  transform: translateY(-3px);
}

.page-about .plate--wide {
  grid-column: span 2;
}

.page-about .plate-num {
  margin: 0;
  font-size: clamp(30px, 5.6vw, 46px);
  line-height: 1;
  color: var(--c-paper);
}

.page-about .plate--wide .plate-num {
  color: var(--c-orange);
}

.page-about .plate-unit {
  margin-left: 4px;
  font-family: var(--font-body);
  font-size: 15px;
  letter-spacing: 0;
  color: var(--c-paper);
}

.page-about .plate-label {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--c-mint);
}

.page-about .plate-note {
  margin: 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--c-steel);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 820px) {
  .page-about .stages {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
    padding-top: 34px;
    border-top: 1px solid var(--c-rule);
  }

  .page-about .stages::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: -1px;
    height: 1px;
    background: linear-gradient(90deg, var(--c-matrix), rgba(0, 217, 255, 0.5) 58%, transparent);
  }

  .page-about .stage {
    padding: 20px 20px 24px;
    border: 1px solid var(--c-rule);
    border-radius: 12px;
    background: rgba(17, 20, 24, 0.5);
    transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
  }

  .page-about .stage::before {
    top: -40px;
    left: 20px;
  }

  .page-about .stage::after {
    display: none;
  }

  .page-about .stage:hover {
    border-color: rgba(0, 230, 118, 0.5);
    transform: translateY(-4px);
  }

  .page-about .stage:hover::before {
    box-shadow: 0 0 0 6px rgba(0, 230, 118, 0.2);
  }

  .page-about .stage-text {
    font-size: 14px;
  }

  .page-about .zone {
    grid-template-columns: 34px 150px minmax(0, 1fr) auto;
    align-items: baseline;
    gap: 18px;
    padding: 24px 0;
  }

  .page-about .zone:hover {
    background: linear-gradient(90deg, rgba(0, 230, 118, 0.05), transparent 70%);
  }

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

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

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: clamp(44px, 5vw, 84px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 104px;
  }

  .page-about .index-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .index-list li {
    flex: 1 1 auto;
  }

  .page-about .index-list a {
    display: flex;
    width: 100%;
    min-height: 0;
    padding: 11px 0 11px 16px;
    border: 0;
    border-left: 1px solid var(--c-rule);
    border-radius: 0;
    background: transparent;
    font-size: 13px;
  }

  .page-about .index-list a:hover,
  .page-about .index-list a:focus-visible {
    border-left-color: var(--c-matrix);
    color: var(--c-matrix);
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.78fr);
    align-items: start;
    gap: clamp(32px, 4vw, 52px);
  }

  .page-about .team-grid .shot {
    margin-top: 6px;
  }

  .page-about .sec-num {
    right: 0;
  }
}

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

  .page-about .plate:hover,
  .page-about .stage:hover {
    transform: none;
  }
}