.page-about {
  background: var(--bg-deep);
  color: var(--ice-white);
  position: relative;
}

.page-about .page-container {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--page-gutter);
}

/* ---------- 首屏拼贴 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(88px, 14vh, 152px);
  padding-bottom: clamp(48px, 8vh, 88px);
  background:
    radial-gradient(120% 90% at 82% 6%, rgba(142, 123, 242, 0.22), transparent 58%),
    radial-gradient(90% 70% at 8% -10%, rgba(61, 155, 240, 0.2), transparent 62%),
    var(--bg-deep);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--crack-blue) 18%, var(--ice-blue) 58%, rgba(142, 123, 242, 0.5) 78%, transparent);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(36px, 6vw, 68px);
  align-items: end;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--frost-silver);
  margin-bottom: 30px;
}

.page-about .breadcrumb a {
  color: var(--frost-silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .breadcrumb a:hover {
  color: var(--ice-blue);
  border-bottom-color: var(--ice-blue);
}

.page-about .about-hero-lead .eyebrow {
  display: block;
  margin-bottom: 18px;
  color: var(--frost-silver);
  font-family: var(--font-mono);
  letter-spacing: 0.18em;
}

.page-about .about-hero-lead h1 {
  margin: 0 0 24px;
  max-width: 20ch;
  color: var(--ice-white);
}

.page-about .about-hero-lead .lede {
  max-width: 56ch;
  color: rgba(243, 248, 255, 0.8);
  line-height: 1.9;
  margin: 0;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.page-about .about-hero-tiles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-tile {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 20px 18px;
  border: 1px solid var(--crack-blue);
  border-radius: 2px;
  background: linear-gradient(158deg, rgba(61, 155, 240, 0.14), rgba(11, 21, 38, 0.92) 62%);
  box-shadow: 0 18px 40px rgba(5, 11, 24, 0.45);
  position: relative;
}

.page-about .about-tile::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 42px;
  height: 2px;
  background: var(--neon-cyan);
  opacity: 0.85;
}

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

.page-about .about-tile-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--frost-silver);
}

.page-about .about-tile-value {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(30px, 4.4vw, 44px);
  line-height: 1.05;
  letter-spacing: 0.01em;
  color: var(--ice-white);
}

.page-about .about-tile-note {
  font-size: 13px;
  color: var(--frost-silver);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

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

.page-about .chapter-rail.about-rail {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  margin-bottom: 22px;
  padding: 14px 0 10px;
  scrollbar-width: none;
}

.page-about .about-rail::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail-title {
  display: none;
}

.page-about .chapter-link {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--frost-silver);
  text-decoration: none;
  white-space: nowrap;
  padding: 5px 11px;
  border: 1px solid transparent;
  border-radius: 999px;
  transition: color 0.24s ease, border-color 0.24s ease, background-color 0.24s ease;
}

.page-about .chapter-link.is-active,
.page-about .chapter-link:hover {
  color: var(--ice-white);
  border-color: var(--ice-blue);
  background: rgba(61, 155, 240, 0.12);
}

.page-about .about-chapter {
  padding: clamp(38px, 6vw, 84px) 0;
}

.page-about .about-crack {
  position: relative;
  height: 1px;
  margin-bottom: clamp(28px, 4vw, 46px);
  background: linear-gradient(90deg, var(--crack-blue), rgba(61, 155, 240, 0.55) 34%, rgba(142, 123, 242, 0.42) 60%, transparent);
}

.page-about .about-crack::after {
  content: "";
  position: absolute;
  left: 34%;
  top: -1px;
  width: 54px;
  height: 3px;
  background: var(--neon-cyan);
  opacity: 0.85;
}

.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 40px);
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--frost-silver);
  margin: 0 0 14px;
}

.page-about .about-col h2 {
  margin: 0 0 20px;
  max-width: 24ch;
  color: var(--ice-white);
}

.page-about .about-col p {
  max-width: var(--text-max);
  margin: 0 0 18px;
  color: rgba(243, 248, 255, 0.78);
  line-height: 1.9;
}

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

.page-about .about-col a,
.page-about .about-linkline a {
  color: var(--ice-blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 155, 240, 0.4);
}

.page-about .about-col a:hover,
.page-about .about-linkline a:hover {
  color: var(--neon-cyan);
  border-bottom-color: var(--neon-cyan);
}

.page-about .about-mail {
  font-family: var(--font-mono);
  font-size: 0.95em;
  color: var(--neon-cyan);
  word-break: break-all;
}

.page-about .about-aside-note {
  max-width: 62ch;
  margin: 4px 0 0;
  padding-left: 16px;
  border-left: 1px solid var(--ice-blue);
  color: var(--frost-silver);
  font-size: 14px;
  line-height: 1.85;
}

.page-about .about-linkline {
  max-width: var(--text-max);
  margin: 4px 0 0;
  color: var(--frost-silver);
  line-height: 1.9;
}

/* ---------- 图片 ---------- */
.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about .about-suspend,
.page-about .about-wide-figure,
.page-about .about-bleed {
  margin: 0;
}

.page-about .about-suspend img,
.page-about .about-wide-figure img,
.page-about .about-bleed img {
  width: 100%;
  border-radius: 2px;
  border: 1px solid var(--crack-blue);
  box-shadow: 0 26px 64px rgba(5, 11, 24, 0.55);
}

.page-about .about-bleed {
  margin-right: calc(-1 * var(--page-gutter));
  margin-block: clamp(28px, 4vw, 44px);
}

.page-about .about-bleed img {
  border-right: 0;
  border-radius: 2px 0 0 2px;
}

.page-about .image-caption {
  margin-top: 12px;
  font-size: 13px;
  color: var(--frost-silver);
  line-height: 1.7;
}

.page-about .about-wide-figure {
  margin-top: clamp(30px, 4vw, 48px);
}

/* ---------- 团队浅色区块 ---------- */
.page-about .about-chapter--mist {
  margin-right: calc(-1 * var(--page-gutter));
  margin-block: clamp(20px, 3vw, 32px);
  padding-inline: clamp(20px, 4vw, 54px);
  background: var(--mist-face);
  color: #0a1526;
  border-radius: 2px 0 0 2px;
}

.page-about .about-chapter--mist .about-crack {
  background: linear-gradient(90deg, rgba(27, 42, 68, 0.28), rgba(61, 155, 240, 0.65) 34%, rgba(142, 123, 242, 0.45) 60%, transparent);
}

.page-about .about-chapter--mist .about-num {
  color: #4a5d7a;
}

.page-about .about-chapter--mist h2,
.page-about .about-chapter--mist .heading-3 {
  color: #0a1526;
}

.page-about .about-chapter--mist .about-col p,
.page-about .about-chapter--mist .about-card p,
.page-about .about-chapter--mist .about-aside-note {
  color: rgba(10, 21, 38, 0.76);
}

.page-about .about-chapter--mist .about-aside-note {
  border-left-color: var(--ice-blue);
  color: rgba(10, 21, 38, 0.62);
}

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

.page-about .about-card {
  padding: 24px 22px;
  background: #ffffff;
  border: 1px solid rgba(27, 42, 68, 0.12);
  border-radius: 2px;
  box-shadow: 0 12px 30px rgba(11, 21, 38, 0.07);
}

.page-about .about-card .heading-3 {
  margin: 0 0 12px;
}

.page-about .about-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
}

/* ---------- 节奏时间线 ---------- */
.page-about .about-beats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 6px;
}

.page-about .about-beat {
  padding-left: 20px;
  border-left: 1px solid var(--crack-blue);
  position: relative;
}

.page-about .about-beat::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 6px;
  width: 1px;
  height: 26px;
  background: var(--ice-blue);
}

.page-about .about-beat-tag {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--neon-cyan);
}

.page-about .about-beat .heading-3 {
  margin: 0 0 10px;
  color: var(--ice-white);
}

.page-about .about-beat p {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(243, 248, 255, 0.72);
}

/* ---------- 合作横向浏览 ---------- */
.page-about .about-drag {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  padding: 4px 0 16px;
  margin-top: clamp(26px, 4vw, 40px);
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-drag:focus-visible {
  outline: 1px solid var(--ice-blue);
  outline-offset: 4px;
}

.page-about .about-drag-item {
  flex: 0 0 min(76vw, 304px);
  scroll-snap-align: start;
  padding: 22px 20px;
  border: 1px solid var(--crack-blue);
  border-radius: 2px;
  background: linear-gradient(168deg, rgba(11, 21, 38, 0.95), rgba(5, 11, 24, 0.95));
}

.page-about .about-drag-tag {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--aurora-purple);
}

.page-about .about-drag-item .heading-3 {
  margin: 0 0 10px;
  font-size: 19px;
  color: var(--ice-white);
}

.page-about .about-drag-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(243, 248, 255, 0.72);
}

/* ---------- 数据条 ---------- */
.page-about .about-facts {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--crack-blue);
  border: 1px solid var(--crack-blue);
  border-radius: 2px;
  overflow: hidden;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 20px;
  background: var(--bg-night);
}

.page-about .about-fact-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--frost-silver);
}

.page-about .about-fact-val {
  font-size: 15px;
  line-height: 1.7;
  color: var(--ice-white);
  word-break: break-word;
}

/* ---------- 收束 ---------- */
.page-about .about-close {
  margin-top: clamp(30px, 5vw, 56px);
  padding: clamp(34px, 5vw, 60px) clamp(22px, 4vw, 56px);
  border: 1px solid var(--crack-blue);
  border-radius: 2px;
  background:
    radial-gradient(120% 120% at 88% 0%, rgba(142, 123, 242, 0.24), transparent 58%),
    linear-gradient(160deg, rgba(61, 155, 240, 0.16), rgba(11, 21, 38, 0.95) 55%);
}

.page-about .about-close .eyebrow {
  display: block;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  letter-spacing: 0.18em;
  color: var(--frost-silver);
}

.page-about .about-close h2 {
  margin: 0 0 18px;
  max-width: 26ch;
  color: var(--ice-white);
}

.page-about .about-close p {
  max-width: var(--text-max);
  margin: 0;
  color: rgba(243, 248, 255, 0.78);
  line-height: 1.9;
}

.page-about .about-close-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 720px) {
  .page-about .about-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
  }

  .page-about .about-grid--suspend {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
  }

  .page-about .about-suspend {
    transform: translateY(-38px);
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: 96px minmax(0, 1fr);
    column-gap: clamp(26px, 4vw, 58px);
  }

  .page-about .chapter-rail.about-rail {
    position: sticky;
    top: calc(var(--header-h) + 30px);
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    overflow: visible;
    padding: 0;
    margin-bottom: 0;
    height: max-content;
  }

  .page-about .about-rail-title {
    display: block;
    margin-bottom: 6px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.22em;
    color: var(--frost-silver);
    opacity: 0.66;
  }

  .page-about .chapter-link {
    border: 0;
    border-left: 1px solid var(--crack-blue);
    border-radius: 0;
    padding: 3px 0 3px 13px;
    background: none;
  }

  .page-about .chapter-link.is-active,
  .page-about .chapter-link:hover {
    border-left-color: var(--neon-cyan);
    background: none;
    color: var(--ice-white);
  }

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

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

@media (min-width: 1240px) {
  .page-about .about-suspend {
    transform: translateY(-52px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-suspend {
    transform: none;
  }

  .page-about .chapter-link {
    transition: none;
  }
}