.page-about {
  --about-rail-w: 108px;
  --about-gap: 28px;
  background: var(--ink-900);
  color: var(--paper);
}

.page-about .about-hero {
  padding-bottom: clamp(40px, 6vw, 80px);
  position: relative;
  overflow: hidden;
}

.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  margin: 0 0 clamp(28px, 5vw, 56px);
  padding: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--haze);
  text-transform: uppercase;
}

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

.page-about .about-crumb li + li::before {
  content: "/";
  color: rgba(147, 166, 188, 0.5);
}

.page-about .about-crumb a {
  color: var(--haze);
  text-decoration: none;
  transition: color var(--dur-hover) var(--ease);
}

.page-about .about-crumb a:hover {
  color: var(--cyan);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 56px);
}

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

.page-about .about-title {
  margin: 14px 0 clamp(20px, 3vw, 32px);
  font-family: var(--font-body);
  font-weight: 900;
  font-size: clamp(44px, 9vw, 116px);
  line-height: 0.94;
  letter-spacing: -0.035em;
  color: var(--paper-bright);
}

.page-about .about-title em {
  display: inline-block;
  font-style: normal;
  color: var(--orange);
  transform: skewX(-5deg);
  transform-origin: left bottom;
}

.page-about .about-lede {
  max-width: 42ch;
  margin: 0 0 clamp(24px, 3vw, 36px);
  font-size: 16px;
  line-height: 1.85;
  color: rgba(251, 246, 236, 0.76);
}

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

.page-about .about-hero-track {
  display: grid;
  gap: 18px;
  padding-left: 20px;
  border-left: 2px solid var(--orange);
}

.page-about .about-track-item {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-track-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-track-item:nth-child(2) .about-track-num {
  color: var(--amber);
}

.page-about .about-track-item:nth-child(3) .about-track-num {
  color: var(--cyan);
}

.page-about .about-track-label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--haze);
}

/* ---- 主体布局 ---- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding-top: clamp(36px, 5vw, 64px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .about-index {
  display: flex;
  align-items: center;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-dark);
  scrollbar-width: none;
}

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

.page-about .about-index-cap {
  display: none;
}

.page-about .about-rail {
  display: flex;
  flex-wrap: nowrap;
  gap: 6px;
}

.page-about .about-rail .index-link {
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
  padding: 7px 13px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--haze);
  text-decoration: none;
  transition: color var(--dur-hover) var(--ease),
    border-color var(--dur-hover) var(--ease),
    background-color var(--dur-hover) var(--ease);
}

.page-about .about-rail .index-link:hover {
  color: var(--paper-bright);
  border-color: var(--line-dark);
}

.page-about .about-rail .index-link.is-active {
  color: var(--ink-900);
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(20px, 3vw, 32px);
  min-width: 0;
}

/* ---- 内容块 ---- */
.page-about .about-block {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  padding: clamp(32px, 5vw, 64px) clamp(20px, 4vw, 52px);
}

.page-about .about-block--paper {
  background: var(--paper);
  color: var(--ink-900);
}

.page-about .about-block--bright {
  background: var(--paper-bright);
  color: var(--ink-900);
}

.page-about .about-block--ink {
  background: var(--ink-800);
  color: var(--paper);
}

.page-about .about-block--night {
  background: var(--ink-900);
  color: var(--paper);
  border: 1px solid var(--line-dark);
}

.page-about .about-ghost {
  position: absolute;
  top: -0.16em;
  right: 10px;
  font-family: var(--font-mono);
  font-size: clamp(110px, 20vw, 220px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.05em;
  color: currentColor;
  opacity: 0.07;
  pointer-events: none;
  user-select: none;
}

.page-about .about-h2 {
  position: relative;
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  font-size: clamp(26px, 4.4vw, 44px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.02em;
  max-width: 22em;
}

.page-about .about-lead {
  margin: 0 0 20px;
  font-size: 16px;
  line-height: 1.85;
  max-width: 62ch;
}

.page-about .about-block--paper .about-lead {
  color: rgba(10, 20, 36, 0.78);
}

.page-about .about-block--bright .about-lead {
  color: rgba(10, 20, 36, 0.78);
}

.page-about .about-block--ink .about-lead,
.page-about .about-block--night .about-lead {
  color: rgba(243, 235, 221, 0.76);
}

.page-about .about-prose p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  max-width: 62ch;
}

.page-about .about-block--paper .about-prose p {
  color: rgba(10, 20, 36, 0.78);
}

.page-about .about-block--ink .about-prose p {
  color: rgba(243, 235, 221, 0.76);
}

.page-about .about-note {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.8;
  max-width: 64ch;
}

.page-about .about-block--paper .about-note,
.page-about .about-block--bright .about-note {
  color: rgba(10, 20, 36, 0.62);
}

.page-about .about-block--ink .about-note,
.page-about .about-block--night .about-note {
  color: rgba(243, 235, 221, 0.6);
}

/* ---- 图片 ---- */
.page-about .about-figure {
  position: relative;
  margin: 28px 0 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--ink-800);
}

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

.page-about .about-caption {
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--haze);
  background: var(--ink-900);
  border-top: 1px solid var(--line-dark);
}

/* ---- 四级筛选 ---- */
.page-about .about-steps {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-step-idx {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--amber);
  margin-bottom: 4px;
}

.page-about .about-steps strong {
  display: block;
  font-size: 17px;
  color: var(--paper-bright);
  margin-bottom: 6px;
}

.page-about .about-steps p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(243, 235, 221, 0.7);
}

.page-about .about-compare {
  display: grid;
  gap: 14px;
  margin-top: 26px;
  padding-top: 24px;
  border-top: 1px solid var(--line-dark);
}

.page-about .about-compare-item p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(243, 235, 221, 0.72);
}

.page-about .about-compare .tag {
  font-size: 11px;
  letter-spacing: 0.1em;
}

/* ---- 数据带 ---- */
.page-about .about-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 16px;
  padding: clamp(24px, 3.5vw, 36px) clamp(20px, 3.5vw, 40px);
  border-radius: var(--radius-lg);
  background: linear-gradient(115deg, var(--ink-800), var(--ink-700));
  border: 1px solid var(--line-dark);
}

.page-about .about-band .stat-value {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3.6vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-band .stat-label {
  display: block;
  margin-top: 8px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--haze);
}

.page-about .about-band .stat:nth-child(2) .stat-value {
  color: var(--amber);
}

.page-about .about-band .stat:nth-child(3) .stat-value {
  color: var(--cyan);
}

.page-about .about-band .stat:nth-child(4) .stat-value {
  color: var(--paper-bright);
}

/* ---- 三道流程 ---- */
.page-about .about-pipeline {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-pipe {
  position: relative;
  padding: 22px 20px 20px 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line-paper);
  background: rgba(255, 255, 255, 0.42);
}

.page-about .about-pipe::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  width: 3px;
  height: 30px;
  border-radius: 0 3px 3px 0;
  background: var(--orange);
}

.page-about .about-pipe:nth-child(2)::before {
  background: var(--cyan);
}

.page-about .about-pipe:nth-child(3)::before {
  background: var(--ember);
}

.page-about .about-pipe-num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: rgba(10, 20, 36, 0.48);
}

.page-about .about-pipe h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--ink-900);
}

.page-about .about-pipe p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(10, 20, 36, 0.7);
}

/* ---- 集锦 ---- */
.page-about .about-video-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-about .about-video-copy {
  min-width: 0;
}

.page-about .about-six {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-six li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: rgba(251, 246, 236, 0.06);
  border: 1px solid var(--line-dark-soft);
  font-size: 14px;
  color: var(--paper);
  transition: border-color var(--dur-hover) var(--ease),
    background-color var(--dur-hover) var(--ease);
}

.page-about .about-six li:hover {
  background: rgba(45, 212, 232, 0.1);
  border-color: var(--cyan);
}

.page-about .about-six li span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--amber);
}

.page-about .about-video-grid .about-figure {
  margin-top: 0;
}

/* ---- 团队 ---- */
.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  margin-top: 24px;
}

.page-about .about-bars {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  min-width: 0;
}

.page-about .about-bar {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr) 48px;
  gap: 10px;
  align-items: center;
  font-size: 13px;
}

.page-about .about-bar-name {
  color: rgba(10, 20, 36, 0.8);
  white-space: nowrap;
}

.page-about .about-bar-track {
  display: block;
  height: 12px;
  border-radius: var(--radius-pill);
  background: rgba(10, 20, 36, 0.08);
  overflow: hidden;
}

.page-about .about-bar-fill {
  display: block;
  height: 100%;
  border-radius: var(--radius-pill);
  background: var(--orange);
  transition: filter var(--dur-hover) var(--ease);
}

.page-about .about-bar:hover .about-bar-fill {
  filter: brightness(1.12);
}

.page-about .about-bar-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  text-align: right;
  color: rgba(10, 20, 36, 0.75);
}

.page-about .about-bars li:nth-child(1) .about-bar-fill {
  width: 33.3%;
  background: var(--orange);
}

.page-about .about-bars li:nth-child(2) .about-bar-fill {
  width: 21.4%;
  background: var(--cyan);
}

.page-about .about-bars li:nth-child(3) .about-bar-fill {
  width: 19%;
  background: var(--ember);
}

.page-about .about-bars li:nth-child(4) .about-bar-fill {
  width: 14.3%;
  background: var(--amber);
}

.page-about .about-bars li:nth-child(5) .about-bar-fill {
  width: 11.9%;
  background: var(--haze);
}

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

/* ---- 时间线 ---- */
.page-about .about-timeline {
  list-style: none;
  margin: 28px 0 0;
  padding: 0 0 0 26px;
  display: grid;
  gap: 22px;
  border-left: 1px dashed var(--line-dark);
}

.page-about .about-tl-item {
  position: relative;
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 77, 28, 0.16);
  transition: box-shadow var(--dur-hover) var(--ease);
}

.page-about .about-tl-item:hover::before {
  box-shadow: 0 0 0 7px rgba(255, 77, 28, 0.22);
}

.page-about .about-tl-year {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 18px;
  font-weight: 700;
  color: var(--amber);
}

.page-about .about-tl-item strong {
  display: block;
  font-size: 16px;
  color: var(--paper-bright);
  margin-bottom: 6px;
}

.page-about .about-tl-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(243, 235, 221, 0.7);
  max-width: 58ch;
}

.page-about .about-partners {
  margin-top: 32px;
  padding-top: 26px;
  border-top: 1px solid var(--line-dark);
}

.page-about .about-partners-title {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--paper-bright);
}

.page-about .about-partners p {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(243, 235, 221, 0.72);
  max-width: 64ch;
}

.page-about .about-partner-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-partner-tags .tag {
  font-size: 11px;
  letter-spacing: 0.1em;
}

/* ---- 尾段 ---- */
.page-about .about-next {
  border-radius: var(--radius-lg);
  padding: clamp(30px, 4.5vw, 52px) clamp(20px, 4vw, 52px);
  background: linear-gradient(118deg, var(--orange), var(--ember));
  color: var(--paper-bright);
}

.page-about .about-next-title {
  margin: 0 0 12px;
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 900;
  letter-spacing: -0.02em;
}

.page-about .about-next p {
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.8;
  max-width: 56ch;
  color: rgba(251, 246, 236, 0.88);
}

.page-about .about-next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-next-link {
  display: inline-flex;
  align-items: center;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(251, 246, 236, 0.5);
  background: transparent;
  color: var(--paper-bright);
  font-size: 14px;
  text-decoration: none;
  transition: background-color var(--dur-hover) var(--ease),
    color var(--dur-hover) var(--ease),
    border-color var(--dur-hover) var(--ease);
}

.page-about .about-next-link:hover,
.page-about .about-next-link:focus-visible {
  background: var(--ink-900);
  border-color: var(--ink-900);
  color: var(--paper-bright);
}

/* ---- 响应式 ---- */
@media (min-width: 560px) {
  .page-about .about-six {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-compare {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }
}

@media (min-width: 720px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 24px;
  }

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

  .page-about .about-pipeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-caption {
    font-size: 12px;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.8fr);
    align-items: end;
  }

  .page-about .about-video-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    align-items: start;
    gap: 36px;
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: center;
    gap: 36px;
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px 40px;
    border-left: 0;
    padding-left: 0;
    border-top: 1px dashed var(--line-dark);
    padding-top: 26px;
  }

  .page-about .about-tl-item::before {
    left: 0;
    top: -32px;
  }

  .page-about .about-tl-item {
    padding-left: 0;
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-gap);
  }

  .page-about .about-index {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
    overflow: visible;
    padding-bottom: 0;
    border-bottom: 0;
  }

  .page-about .about-index-cap {
    display: block;
    margin-bottom: 14px;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.18em;
    color: var(--haze);
  }

  .page-about .about-rail {
    flex-direction: column;
    gap: 4px;
  }

  .page-about .about-rail .index-link {
    border-radius: var(--radius-sm);
    padding: 8px 10px;
    font-size: 11px;
    letter-spacing: 0.06em;
  }
}

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

  .page-about .about-rail .index-link,
  .page-about .about-six li,
  .page-about .about-next-link,
  .page-about .about-bar-fill,
  .page-about .about-tl-item::before {
    transition: none;
  }
}