.page-about {
  --about-edge: rgba(242, 238, 230, 0.10);
  --about-rail: rgba(58, 70, 88, 0.62);
  --about-text: rgba(242, 238, 230, 0.80);
  --about-text-soft: rgba(242, 238, 230, 0.58);
  --about-glass: rgba(30, 58, 95, 0.32);
  background-color: var(--c-void);
  color: var(--c-cream);
}

.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.page-about [data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
}

.page-about section[id],
.page-about .stage-card[id] {
  scroll-margin-top: 112px;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(18px, 3.4vw, 32px);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--about-text-soft);
}

.page-about .about-crumbs a {
  color: var(--about-text-soft);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .about-crumbs a:hover {
  color: var(--c-neon);
}

.page-about .about-crumbs [aria-current="page"] {
  color: var(--c-amber);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(84px, 12vw, 128px) 0 clamp(32px, 5vw, 56px);
  background:
    radial-gradient(58% 52% at 88% 2%, rgba(245, 184, 75, 0.17), transparent 68%),
    radial-gradient(52% 48% at 0% 96%, rgba(56, 242, 208, 0.09), transparent 70%),
    var(--c-void);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(242, 238, 230, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(242, 238, 230, 0.05) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(74% 62% at 50% 16%, #000 0%, transparent 78%);
  mask-image: radial-gradient(74% 62% at 50% 16%, #000 0%, transparent 78%);
  opacity: 0.55;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
}

.page-about .about-hero__title {
  margin: 0.3em 0 0.45em;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2.55rem, 9vw, 5.4rem);
  line-height: 1.02;
  letter-spacing: -0.038em;
  color: var(--c-cream);
}

.page-about .about-hero__title em {
  display: block;
  font-style: normal;
  color: var(--c-amber);
  text-shadow: 0 0 46px rgba(245, 184, 75, 0.26);
}

.page-about .about-hero__copy {
  max-width: 54ch;
  margin: 0 0 clamp(20px, 3vw, 28px);
  font-size: var(--fs-16);
  line-height: 1.78;
  color: var(--about-text);
}

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

/* 概况卡 */
.page-about .about-facts {
  padding: clamp(20px, 3.2vw, 28px);
  border-radius: var(--r-l);
  border: 1px solid var(--about-edge);
  background: linear-gradient(160deg, rgba(30, 58, 95, 0.52), rgba(26, 34, 48, 0.72));
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  box-shadow: var(--sh-float);
}

.page-about .about-facts__cap {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-amber);
}

.page-about .about-facts__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .fact-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.55rem, 5vw, 2.05rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-cream);
}

.page-about .fact-label {
  display: block;
  margin-top: 8px;
  font-size: var(--fs-12);
  letter-spacing: 0.03em;
  color: var(--about-text-soft);
}

.page-about .about-facts__note {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--about-edge);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--c-neon);
}

/* ---------- 主体双栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(20px, 3.4vw, 40px);
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-about .stage-index {
  padding: 16px 0 0;
  border-top: 1px solid var(--about-rail);
}

.page-about .stage-index__cap {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--about-text-soft);
}

.page-about .stage-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .stage-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 4px 0;
  font-size: var(--fs-14);
  color: var(--about-text);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .stage-index__list a span {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--c-amber);
}

.page-about .stage-index__list a:hover {
  color: var(--c-amber);
  border-bottom-color: var(--c-amber);
}

/* ---------- 章节 ---------- */
.page-about .about-flow {
  display: grid;
  gap: clamp(38px, 6vw, 72px);
  min-width: 0;
}

.page-about .about-sec {
  padding-top: clamp(30px, 5vw, 44px);
  border-top: 1px solid var(--about-edge);
}

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

.page-about .sec-head {
  margin-bottom: clamp(16px, 2.6vw, 24px);
}

.page-about .sec-num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-amber);
}

.page-about .sec-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.5rem, 4.6vw, 2.35rem);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--c-cream);
}

.page-about .about-p {
  margin: 0 0 1.1em;
  max-width: 62ch;
  font-size: var(--fs-16);
  line-height: 1.78;
  color: var(--about-text);
}

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

/* ---------- 三根支柱 ---------- */
.page-about .pillar-list {
  display: grid;
  gap: 1px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  border-radius: var(--r-m);
  overflow: hidden;
  background: var(--about-rail);
}

.page-about .pillar {
  padding: 18px 20px;
  background: var(--c-rock);
}

.page-about .pillar__k {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--c-neon);
}

.page-about .pillar p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.72;
  color: var(--about-text);
}

/* ---------- 场景卡 ---------- */
.page-about .use-grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .use-card {
  padding: 20px;
  border-radius: var(--r-m);
  border: 1px solid var(--about-rail);
  background: linear-gradient(170deg, rgba(26, 34, 48, 0.96), rgba(26, 34, 48, 0.66));
  transition: border-color 0.22s ease, transform 0.22s ease;
}

.page-about .use-card:hover {
  border-color: rgba(245, 184, 75, 0.5);
  transform: translateY(-2px);
}

.page-about .use-card__tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--c-amber);
}

.page-about .use-card__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: var(--fs-20);
  font-weight: 700;
  line-height: 1.3;
  color: var(--c-cream);
}

.page-about .use-card p:last-child {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.72;
  color: var(--about-text);
}

/* ---------- 图片 ---------- */
.page-about .about-media {
  margin: clamp(22px, 3.4vw, 32px) 0 0;
  border-radius: var(--r-m);
  overflow: hidden;
  border: 1px solid var(--about-rail);
  background: var(--c-rock);
}

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

.page-about .about-media figcaption {
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--about-text-soft);
  border-top: 1px solid var(--about-rail);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(142px, 1fr);
  gap: 0;
  margin: clamp(18px, 3vw, 26px) 0 clamp(22px, 3.4vw, 32px);
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .timeline__item {
  position: relative;
  border-top: 1px solid var(--about-rail);
  padding: 18px 16px 0 0;
}

.page-about .timeline__link {
  display: block;
  color: inherit;
  text-decoration: none;
}

.page-about .timeline__dot {
  position: absolute;
  top: -5.5px;
  left: 0;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-amber);
  box-shadow: 0 0 0 4px rgba(245, 184, 75, 0.16);
  transition: box-shadow 0.22s ease;
}

.page-about .timeline__link:hover .timeline__dot {
  box-shadow: 0 0 0 6px rgba(245, 184, 75, 0.26);
}

.page-about .timeline__tag {
  display: block;
  font-family: var(--font-head);
  font-size: var(--fs-16);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-cream);
}

.page-about .timeline__link:hover .timeline__tag {
  color: var(--c-amber);
}

.page-about .timeline__meta {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--about-text-soft);
}

/* ---------- 阶段卡 ---------- */
.page-about .stage-list {
  display: grid;
  gap: 12px;
}

.page-about .stage-card {
  padding: 18px 20px;
  border-radius: var(--r-m);
  border-left: 2px solid var(--c-stone);
  background: rgba(26, 34, 48, 0.72);
}

.page-about .stage-card--now {
  border-left-color: var(--c-amber);
  background: linear-gradient(120deg, rgba(245, 184, 75, 0.10), rgba(26, 34, 48, 0.8) 62%);
}

.page-about .stage-card__idx {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--c-amber);
}

.page-about .stage-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: var(--fs-20);
  font-weight: 700;
  line-height: 1.32;
  color: var(--c-cream);
}

.page-about .stage-card p:last-child {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.74;
  color: var(--about-text);
}

/* ---------- 数据带 ---------- */
.page-about .stat-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(18px, 3vw, 28px) 0;
  padding: 0;
  list-style: none;
  border-radius: var(--r-m);
  overflow: hidden;
  background: var(--about-rail);
}

.page-about .stat-band__cell {
  padding: clamp(16px, 2.6vw, 22px);
  background: var(--c-rock);
}

.page-about .stat-band__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4.6vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--c-neon);
}

.page-about .stat-band__label {
  display: block;
  margin-top: 8px;
  font-size: var(--fs-12);
  letter-spacing: 0.03em;
  color: var(--about-text-soft);
}

/* ---------- 生态 ---------- */
.page-about .eco-grid {
  display: grid;
  gap: 12px;
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .eco-card {
  padding: 18px 20px;
  border-radius: var(--r-m);
  border: 1px solid var(--about-rail);
  background: rgba(26, 34, 48, 0.6);
}

.page-about .eco-card__k {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--c-amber);
}

.page-about .eco-card p:last-child {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.72;
  color: var(--about-text);
}

.page-about .honor {
  margin-top: clamp(18px, 3vw, 26px);
  padding: 22px;
  border-radius: var(--r-m);
  border: 1px solid rgba(245, 184, 75, 0.34);
  background: linear-gradient(135deg, rgba(245, 184, 75, 0.13), rgba(7, 11, 20, 0.5) 70%);
}

.page-about .honor__tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--c-amber);
}

.page-about .honor__text {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.78;
  color: var(--about-text);
}

/* ---------- 咨询入口 ---------- */
.page-about .help-grid {
  display: grid;
  gap: 12px;
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .help-card {
  display: block;
  padding: 20px;
  border-radius: var(--r-m);
  border: 1px solid var(--about-rail);
  background: rgba(26, 34, 48, 0.68);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.22s ease, background 0.22s ease, transform 0.22s ease;
}

.page-about .help-card:hover {
  border-color: rgba(56, 242, 208, 0.55);
  background: rgba(30, 58, 95, 0.4);
  transform: translateY(-2px);
}

.page-about .help-card__idx {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--c-neon);
}

.page-about .help-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: var(--fs-20);
  font-weight: 700;
  color: var(--c-cream);
}

.page-about .help-card p {
  margin: 0 0 12px;
  font-size: var(--fs-14);
  line-height: 1.72;
  color: var(--about-text);
}

.page-about .help-card__go {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--c-amber);
}

/* ---------- 结尾召唤 ---------- */
.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-top: clamp(24px, 4vw, 36px);
  padding: clamp(20px, 3.4vw, 30px);
  border-radius: var(--r-l);
  border: 1px solid rgba(255, 106, 42, 0.3);
  background: linear-gradient(120deg, rgba(255, 106, 42, 0.14), rgba(26, 34, 48, 0.85) 60%);
}

.page-about .about-cta__text {
  flex: 1 1 320px;
  min-width: 0;
}

.page-about .about-cta__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: var(--fs-20);
  font-weight: 700;
  color: var(--c-cream);
}

.page-about .about-cta__sub {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--about-text);
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .use-grid,
  .page-about .eco-grid,
  .page-about .help-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 760px) {
  .page-about .timeline {
    grid-auto-flow: row;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    overflow: visible;
  }

  .page-about .timeline__item {
    padding-right: 20px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.72fr);
    gap: clamp(32px, 4vw, 60px);
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 60px);
    align-items: start;
  }

  .page-about .stage-index {
    position: sticky;
    top: 108px;
    padding-top: 4px;
  }

  .page-about .stage-index__list {
    display: grid;
    gap: 2px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .use-card,
  .page-about .help-card,
  .page-about .timeline__dot {
    transition: none;
  }
}