.page-about {
  --about-pad: clamp(20px, 3.4vw, 40px);
  --about-gap: clamp(16px, 2.6vw, 30px);
  --about-edge: clamp(42px, 7vw, 88px);
  display: block;
}

.page-about > .breadcrumb {
  padding-top: clamp(18px, 4vw, 36px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 5vw, 64px) 0 clamp(30px, 5vw, 56px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -20% auto -20%;
  height: 460px;
  background:
    radial-gradient(58% 100% at 18% 0%, var(--neon-08), transparent 68%),
    radial-gradient(42% 90% at 92% 12%, var(--amber-12), transparent 72%);
  pointer-events: none;
}

.page-about .hero-inner {
  position: relative;
}

.page-about .about-hero h1 {
  margin: 14px 0 20px;
  max-width: 15em;
  font-size: clamp(2.15rem, 7.6vw, 4.4rem);
  line-height: 1.06;
  letter-spacing: -0.035em;
  font-weight: 800;
  color: var(--text);
}

.page-about .hero-lead {
  margin: 0;
  max-width: 48ch;
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .fact-row {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: clamp(18px, 2.6vw, 26px) 0 0;
  border-top: 1px solid var(--ink-600);
  display: grid;
  gap: 16px 22px;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.page-about .fact-key {
  display: block;
  margin-bottom: 6px;
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .fact-val {
  display: block;
  font-size: clamp(1rem, 2vw, 1.22rem);
  font-weight: 700;
  color: var(--text);
}

.page-about .fact-val.mono {
  color: var(--neon);
}

.page-about .anchor-rail {
  display: flex;
  gap: 10px;
  margin-top: clamp(24px, 3.4vw, 34px);
  padding: 4px 0 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .anchor-rail a {
  flex: 0 0 auto;
  padding: 9px 16px;
  border: 1px solid var(--ink-600);
  border-radius: 999px;
  color: var(--mist);
  font-size: .86rem;
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s ease, background .2s ease, border-color .2s ease, transform .2s ease;
}

.page-about .anchor-rail a:hover,
.page-about .anchor-rail a:focus-visible {
  color: var(--ink-900);
  background: var(--neon);
  border-color: var(--neon);
  transform: translateY(-2px);
}

/* ---------- 章节通用 ---------- */

.page-about .about-section {
  padding: var(--about-edge) 0;
}

.page-about .section-head {
  max-width: 62ch;
  margin-bottom: clamp(22px, 3.4vw, 36px);
}

.page-about .about-section h2 {
  margin: 12px 0 14px;
  font-size: clamp(1.5rem, 4.2vw, 2.4rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 800;
}

.page-about .section-lead {
  margin: 0;
  color: var(--mist);
  line-height: 1.85;
}

/* ---------- 定位面板 ---------- */

.page-about .scope-panel {
  display: grid;
  gap: var(--about-gap);
  padding: var(--about-pad);
}

.page-about .scope-panel p {
  margin: 0;
  color: var(--text);
  line-height: 1.85;
}

.page-about .scope-panel p + p {
  margin-top: 14px;
}

.page-about .scope-side h3 {
  margin: 0 0 14px;
  font-size: 1rem;
  letter-spacing: .04em;
  color: var(--neon);
}

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

.page-about .scope-side li {
  position: relative;
  padding-left: 18px;
  font-size: .95rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .scope-side li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 9px;
  height: 2px;
  background: var(--amber);
}

@media (min-width: 860px) {
  .page-about .scope-panel {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  }

  .page-about .scope-side {
    border-left: 1px solid var(--ink-600);
    padding-left: var(--about-gap);
  }
}

/* ---------- 版本演进 ---------- */

.page-about .version-banner {
  margin: 0 0 clamp(24px, 4vw, 40px);
}

.page-about .version-banner img {
  display: block;
  width: 100%;
  height: clamp(170px, 30vw, 300px);
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--ink-600);
}

.page-about .version-banner figcaption {
  margin-top: 10px;
}

.page-about .version-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .version-axis {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: max-content;
  gap: 10px;
  padding-bottom: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .version-axis .tab {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 11px 16px;
  border: 1px solid var(--ink-600);
  border-radius: var(--radius-sm);
  background: var(--ink-700);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: .9rem;
  letter-spacing: .02em;
  cursor: pointer;
  transition: transform .2s ease, border-color .2s ease, color .2s ease, background .2s ease, box-shadow .2s ease;
}

.page-about .version-axis .tab::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-600);
  transition: background .2s ease, box-shadow .2s ease;
}

.page-about .version-axis .tab-ver {
  font-weight: 600;
}

.page-about .version-axis .tab-note {
  font-size: .78rem;
  color: inherit;
  opacity: .78;
}

.page-about .version-axis .tab:hover {
  color: var(--text);
  border-color: var(--neon-28);
  transform: translateY(-2px);
}

.page-about .version-axis .tab:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 3px;
}

.page-about .version-axis .tab[aria-selected="true"] {
  color: var(--ink-900);
  background: var(--neon);
  border-color: var(--neon);
  box-shadow: 0 8px 22px rgba(53, 227, 224, .22);
}

.page-about .version-axis .tab[aria-selected="true"]::before {
  background: var(--ink-900);
}

@media (min-width: 900px) {
  .page-about .version-grid {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: clamp(24px, 3.4vw, 40px);
    align-items: start;
  }

  .page-about .version-axis {
    grid-auto-flow: row;
    grid-auto-columns: auto;
    align-content: start;
    position: relative;
    padding: 0 0 0 30px;
    overflow: visible;
  }

  .page-about .version-axis::before {
    content: "";
    position: absolute;
    left: 9px;
    top: 14px;
    bottom: 14px;
    width: 2px;
    background: linear-gradient(180deg, var(--neon-28), var(--ink-600) 88%);
  }

  .page-about .version-axis .tab::before {
    position: absolute;
    left: -25px;
    top: 50%;
    transform: translateY(-50%);
  }

  .page-about .version-axis .tab[aria-selected="true"]::before {
    background: var(--neon);
    box-shadow: 0 0 0 4px var(--neon-16);
  }
}

.page-about .version-panels {
  display: grid;
  gap: 14px;
}

.page-about .tab-panel[hidden] {
  display: none;
}

.page-about .version-panel {
  padding: var(--about-pad);
  border: 1px solid var(--ink-600);
  border-radius: var(--radius);
  background: linear-gradient(150deg, var(--ink-700), var(--ink-800) 72%);
  box-shadow: 0 18px 42px rgba(5, 10, 20, .34);
}

.page-about .version-panel h3 {
  margin: 0 0 12px;
  font-size: clamp(1.12rem, 2.6vw, 1.48rem);
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.page-about .version-panel p {
  margin: 0;
  color: var(--mist);
  line-height: 1.85;
}

.page-about .version-points {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .version-points li {
  padding: 12px 16px;
  border: 1px solid var(--ink-600);
  border-radius: var(--radius-sm);
  background: var(--glass);
  color: var(--text);
  font-size: .95rem;
  line-height: 1.6;
}

@media (min-width: 720px) {
  .page-about .version-points {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .version-points li:nth-child(2) {
    transform: translateY(10px);
  }

  .page-about .version-points li:nth-child(3) {
    transform: translateY(-6px);
  }
}

/* ---------- 活动中心三栏 ---------- */

.page-about .lane-track {
  list-style: none;
  margin: 0;
  padding: 0 0 14px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(250px, 84%);
  gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
}

.page-about .lane {
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(20px, 2.6vw, 28px);
  border: 1px solid var(--ink-600);
  border-top: 2px solid var(--neon-28);
  border-radius: var(--radius);
  background: linear-gradient(165deg, var(--ink-700), var(--ink-800));
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}

.page-about .lane:hover,
.page-about .lane:focus-within {
  transform: translateY(-4px);
  border-color: var(--neon-28);
  box-shadow: 0 20px 40px rgba(5, 10, 20, .45);
}

.page-about .lane-index {
  font-size: 1.55rem;
  letter-spacing: .06em;
  color: var(--amber);
}

.page-about .lane h3 {
  margin: 0;
  font-size: 1.14rem;
  line-height: 1.35;
}

.page-about .lane p {
  margin: 0;
  color: var(--mist);
  font-size: .96rem;
  line-height: 1.8;
}

.page-about .lane p.lane-meta {
  margin: auto 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--ink-600);
  font-size: .76rem;
  letter-spacing: .08em;
  color: var(--neon);
}

@media (min-width: 900px) {
  .page-about .lane-track {
    grid-auto-flow: row;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    grid-auto-columns: auto;
    padding-bottom: 0;
    overflow: visible;
  }
}

/* ---------- 专区内容体系（纸色层） ---------- */

.page-about .zone-panel {
  display: grid;
  gap: clamp(24px, 3.6vw, 44px);
  padding: var(--about-pad);
}

.page-about .about-section .zone-panel .eyebrow {
  color: var(--paper-link);
}

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

.page-about .zone-main p {
  margin: 0;
  color: var(--paper-ink);
  line-height: 1.85;
}

.page-about .zone-main p + p {
  margin-top: 14px;
}

.page-about .tag-cloud {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.page-about .tag-cloud li {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 15px;
  border: 1px solid rgba(22, 32, 46, .16);
  border-radius: 999px;
  background: rgba(255, 255, 255, .55);
  color: var(--paper-ink);
  font-weight: 600;
  transition: transform .22s ease, border-color .22s ease, box-shadow .22s ease;
}

.page-about .tag-cloud li:hover,
.page-about .tag-cloud li:focus-visible {
  transform: translateY(-3px);
  border-color: var(--amber);
  box-shadow: 0 12px 26px rgba(22, 32, 46, .16);
  outline: none;
}

.page-about .tag-xl {
  font-size: 1.14rem;
}

.page-about .tag-lg {
  font-size: 1rem;
}

.page-about .tag-md {
  font-size: .9rem;
}

.page-about .tag-sm {
  font-size: .8rem;
}

.page-about .tag-note {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--paper-link);
  opacity: .58;
  transition: opacity .22s ease;
}

.page-about .tag-cloud li:hover .tag-note,
.page-about .tag-cloud li:focus-visible .tag-note {
  opacity: 1;
}

.page-about .zone-media {
  margin: 0;
}

.page-about .zone-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.page-about .zone-media figcaption {
  margin-top: 10px;
  color: rgba(22, 32, 46, .62);
  font-size: .82rem;
  line-height: 1.6;
}

@media (min-width: 900px) {
  .page-about .zone-panel {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 更新节奏 ---------- */

.page-about .cadence-media {
  margin: 0 0 clamp(24px, 4vw, 40px);
  max-width: 760px;
}

.page-about .cadence-media img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--ink-600);
  border-radius: var(--radius);
}

.page-about .cadence {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
}

.page-about .cadence-graphic {
  position: relative;
  width: min(100%, 340px);
  aspect-ratio: 1 / 1;
  margin: 0 auto;
  display: grid;
  place-items: center;
}

.page-about .ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid var(--ink-600);
}

.page-about .ring-1 {
  inset: 0;
  border-color: var(--neon-28);
}

.page-about .ring-2 {
  inset: 13%;
}

.page-about .ring-3 {
  inset: 27%;
  border-style: dashed;
}

.page-about .cadence-graphic .core {
  width: 36%;
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
  border: 1px solid var(--neon-28);
  border-radius: 50%;
  background: radial-gradient(circle at 32% 26%, var(--neon-16), transparent 72%);
  color: var(--neon);
  font-size: clamp(.95rem, 3vw, 1.2rem);
  letter-spacing: .04em;
}

.page-about .cadence-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .cadence-list li {
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--ink-600);
  border-left: 2px solid var(--amber-38);
  border-radius: var(--radius);
  background: var(--glass);
  transition: transform .22s ease, border-left-color .22s ease;
}

.page-about .cadence-list li:hover {
  transform: translateX(4px);
  border-left-color: var(--amber);
}

.page-about .cadence-freq {
  display: inline-block;
  margin-bottom: 8px;
  font-size: .76rem;
  letter-spacing: .1em;
  color: var(--amber);
}

.page-about .cadence-list h3 {
  margin: 0 0 8px;
  font-size: 1.08rem;
  line-height: 1.4;
}

.page-about .cadence-list p {
  margin: 0;
  color: var(--mist);
  font-size: .95rem;
  line-height: 1.8;
}

@media (min-width: 900px) {
  .page-about .cadence {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
  }
}

/* ---------- 联系与响应 ---------- */

.page-about .service-panel {
  display: grid;
  gap: clamp(24px, 3.6vw, 44px);
  padding: var(--about-pad);
}

.page-about .service-copy > p {
  max-width: 52ch;
  margin: 0;
  color: var(--mist);
  line-height: 1.85;
}

.page-about .service-items {
  display: grid;
  gap: 12px;
  margin: 22px 0 26px;
}

.page-about .service-item {
  padding: 14px 18px;
  border: 1px solid var(--ink-600);
  border-radius: var(--radius-sm);
  background: var(--ink-800);
  overflow-wrap: anywhere;
}

.page-about .service-key {
  display: block;
  margin-bottom: 6px;
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .service-val {
  display: block;
  font-size: .98rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .service-val.mono {
  color: var(--neon);
}

.page-about .service-links {
  display: grid;
  gap: 10px;
}

.page-about .service-links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 16px;
  border: 1px solid var(--ink-600);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: .95rem;
  text-decoration: none;
  transition: border-color .2s ease, background .2s ease, transform .2s ease;
}

.page-about .service-links a::after {
  content: "→";
  color: var(--neon);
}

.page-about .service-links a:hover,
.page-about .service-links a:focus-visible {
  border-color: var(--neon-28);
  background: var(--neon-08);
  transform: translateX(4px);
}

@media (min-width: 620px) {
  .page-about .service-items {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .service-panel {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .service-links {
    border-left: 1px solid var(--ink-600);
    padding-left: clamp(20px, 3vw, 34px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }

  .page-about .lane:hover,
  .page-about .cadence-list li:hover,
  .page-about .service-links a:hover,
  .page-about .tag-cloud li:hover,
  .page-about .anchor-rail a:hover,
  .page-about .version-axis .tab:hover {
    transform: none;
  }

  .page-about .version-points li:nth-child(2),
  .page-about .version-points li:nth-child(3) {
    transform: none;
  }
}