.page-about {
  --about-edge: rgba(35, 211, 238, 0.30);
  --about-edge-gold: rgba(245, 166, 35, 0.32);
  --about-card: rgba(16, 38, 58, 0.86);
  color: var(--snow);
  padding-bottom: clamp(40px, 7vw, 84px);
  background:
    radial-gradient(820px 480px at 8% -4%, rgba(35, 211, 238, 0.10), transparent 64%),
    radial-gradient(680px 460px at 96% 6%, rgba(245, 166, 35, 0.07), transparent 62%);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist);
  padding: clamp(20px, 4vw, 34px) var(--pad-x) 0;
  max-width: var(--maxw);
  margin: 0 auto;
}

.page-about .breadcrumb a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(124, 231, 247, 0.4);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 0 var(--pad-x) clamp(44px, 7vw, 88px);
  max-width: var(--maxw);
  margin: 0 auto;
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 5vw, 56px);
  align-items: center;
  margin-top: clamp(22px, 4vw, 40px);
}

.page-about .about-hero-copy h1 {
  font-size: clamp(36px, 7.2vw, 78px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  font-weight: 700;
  margin: 16px 0 0;
  max-width: 15em;
  background: linear-gradient(120deg, var(--snow) 34%, var(--cyan-soft) 88%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-hero-copy .lede {
  margin-top: 20px;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.75;
  color: var(--mist);
  max-width: 34em;
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .about-hero-stats li {
  background: var(--about-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(26px, 4.4vw, 38px);
  line-height: 1;
  color: var(--snow);
  text-shadow: 0 0 14px rgba(35, 211, 238, 0.5);
}

.page-about .about-stat-unit {
  font-size: 0.5em;
  margin-left: 2px;
  color: var(--cyan-soft);
}

.page-about .about-stat-label {
  font-size: 13px;
  color: var(--mist);
  letter-spacing: 0.04em;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

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

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: clamp(40px, 7vw, 84px) var(--pad-x);
  max-width: var(--maxw);
  margin: 0 auto;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-chapter::before {
  content: attr(data-no);
  position: absolute;
  top: clamp(18px, 3vw, 34px);
  right: var(--pad-x);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(72px, 15vw, 168px);
  line-height: 0.78;
  color: var(--cyan);
  opacity: 0.08;
  pointer-events: none;
  user-select: none;
}

.page-about .about-chapter-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 3vw, 30px);
}

.page-about .about-mark {
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-about .about-no {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: 0.04em;
}

.page-about .about-vnote {
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--mist);
  writing-mode: horizontal-tb;
}

.page-about .about-title {
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  font-weight: 700;
  margin: 0 0 18px;
}

.page-about .about-body p {
  font-size: 16px;
  line-height: 1.75;
  color: var(--mist);
  max-width: 40em;
  margin: 0 0 16px;
}

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

/* ---------- 时间线 ---------- */
.page-about .about-chapter--timeline {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-rail {
  margin-top: clamp(24px, 4vw, 44px);
  display: flex;
  gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  padding: 6px max(var(--pad-x), calc((100% - var(--maxw)) / 2 + var(--pad-x))) 26px;
  -webkit-overflow-scrolling: touch;
  scrollbar-color: rgba(35, 211, 238, 0.4) transparent;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-rail:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .about-rail-track {
  display: flex;
  gap: 16px;
  list-style: none;
  margin: 0;
  padding: 22px 0 0;
}

.page-about .about-node {
  position: relative;
  scroll-snap-align: start;
  flex: 0 0 min(272px, 76vw);
  background: var(--about-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 22px 22px 26px;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  top: 0;
  left: 22px;
  width: 46px;
  height: 3px;
  border-radius: 999px;
  background: var(--cyan);
  transform: translateY(-1px);
}

.page-about .about-node--gold::before {
  background: var(--gold);
}

.page-about .about-node-no {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--cyan-soft);
}

.page-about .about-node--gold .about-node-no {
  color: var(--gold);
}

.page-about .about-node h3 {
  font-size: 19px;
  font-weight: 600;
  margin: 12px 0 10px;
  letter-spacing: -0.01em;
}

.page-about .about-node p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
  margin: 0;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 40px);
  margin-top: 8px;
}

.page-about .about-tree {
  width: 100%;
  height: auto;
  display: block;
  max-width: 640px;
}

.page-about .about-tree path {
  fill: none;
  stroke: var(--about-edge);
  stroke-width: 1.5;
}

.page-about .about-tree rect {
  fill: rgba(16, 38, 58, 0.94);
  stroke: var(--about-edge);
  stroke-width: 1.2;
}

.page-about .about-tree text {
  fill: var(--snow);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  text-anchor: middle;
}

.page-about .about-tree .tree-sub {
  fill: var(--cyan-soft);
  font-family: var(--font-mono);
  font-size: 13px;
}

.page-about .about-tree .tree-root rect {
  stroke: rgba(35, 211, 238, 0.62);
}

.page-about .about-tree .tree-leaf--b rect {
  stroke: var(--about-edge-gold);
}

.page-about .about-tree .tree-leaf--b .tree-sub {
  fill: var(--gold);
}

.page-about .about-tree .tree-leaf--c rect {
  stroke: rgba(169, 188, 205, 0.36);
}

.page-about .about-tree .tree-leaf--c .tree-sub {
  fill: var(--mist);
}

.page-about .about-role-list {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-role {
  background: var(--about-card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius-md);
  padding: 18px 20px;
}

.page-about .about-role:nth-child(2) {
  border-left-color: var(--gold);
}

.page-about .about-role:nth-child(3) {
  border-left-color: var(--crimson);
}

.page-about .about-role dt {
  font-size: 16px;
  font-weight: 600;
  color: var(--snow);
  margin-bottom: 8px;
}

.page-about .about-role dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 通栏配图 ---------- */
.page-about .about-wide-media {
  margin: clamp(28px, 5vw, 52px) auto 0;
  max-width: var(--maxw);
}

/* ---------- 人群 ---------- */
.page-about .about-crowd {
  list-style: none;
  padding: 0;
  margin: 10px 0 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-crowd-card {
  background: var(--about-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 22px 22px 24px;
  position: relative;
  overflow: hidden;
}

.page-about .about-crowd-card::after {
  content: "";
  position: absolute;
  inset: auto -30% -60% auto;
  width: 190px;
  height: 190px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(35, 211, 238, 0.16), transparent 68%);
  pointer-events: none;
}

.page-about .about-crowd-card:nth-child(even)::after {
  background: radial-gradient(circle, rgba(245, 166, 35, 0.14), transparent 68%);
}

.page-about .about-crowd-tag {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan-soft);
  border: 1px solid var(--about-edge);
  border-radius: var(--pill);
  padding: 4px 12px;
}

.page-about .about-crowd-card:nth-child(even) .about-crowd-tag {
  color: var(--gold);
  border-color: var(--about-edge-gold);
}

.page-about .about-crowd-card h3 {
  font-size: 19px;
  font-weight: 600;
  margin: 14px 0 10px;
}

.page-about .about-crowd-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
  margin-top: 12px;
}

.page-about .about-rings {
  width: 100%;
  height: auto;
  max-width: 460px;
  justify-self: center;
  display: block;
}

.page-about .about-rings .ring {
  fill: none;
}

.page-about .about-rings .ring--a {
  stroke: var(--gold);
  stroke-width: 1.6;
  opacity: 0.85;
}

.page-about .about-rings .ring--b {
  stroke: var(--cyan);
  stroke-width: 1.4;
  opacity: 0.7;
}

.page-about .about-rings .ring--c {
  stroke: var(--mist);
  stroke-width: 1.2;
  opacity: 0.5;
  stroke-dasharray: 5 9;
}

.page-about .about-rings .ring-core {
  fill: rgba(35, 211, 238, 0.10);
  stroke: rgba(35, 211, 238, 0.35);
  stroke-width: 1;
}

.page-about .about-eco-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-eco-item {
  background: var(--about-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 18px 20px;
}

.page-about .about-eco-item--a {
  border-left: 3px solid var(--gold);
}

.page-about .about-eco-item--b {
  border-left: 3px solid var(--cyan);
}

.page-about .about-eco-item--c {
  border-left: 3px solid var(--mist);
}

.page-about .about-eco-value {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(28px, 4vw, 38px);
  line-height: 1;
  color: var(--snow);
  text-shadow: 0 0 12px rgba(35, 211, 238, 0.42);
}

.page-about .about-eco-unit {
  font-size: 0.48em;
  margin-left: 2px;
  color: var(--cyan-soft);
}

.page-about .about-eco-item strong {
  display: inline-block;
  margin-left: 10px;
  font-size: 15px;
  font-weight: 600;
  color: var(--snow);
}

.page-about .about-eco-item p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 节奏 ---------- */
.page-about .about-rhythm {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-rhythm-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 16px 4px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-rhythm-key {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .about-rhythm-text {
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  max-width: var(--maxw);
  margin: clamp(30px, 5vw, 56px) auto 0;
  padding: 0 var(--pad-x);
}

.page-about .about-next-inner {
  position: relative;
  background: linear-gradient(150deg, rgba(14, 58, 74, 0.72), rgba(16, 38, 58, 0.92));
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: clamp(28px, 5vw, 48px);
  overflow: hidden;
}

.page-about .about-next-band {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--cyan), var(--gold) 62%, var(--crimson));
}

.page-about .about-next-inner h2 {
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  margin: 0 0 14px;
  letter-spacing: -0.01em;
}

.page-about .about-next-inner p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
  max-width: 42em;
}

.page-about .about-next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

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

  .page-about .about-rhythm-row {
    grid-template-columns: 132px minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: 1.04fr 0.96fr;
  }

  .page-about .about-chapter-inner {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 64px);
  }

  .page-about .about-mark {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
    position: sticky;
    top: 108px;
    align-self: start;
  }

  .page-about .about-vnote {
    writing-mode: vertical-rl;
    letter-spacing: 0.32em;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
  }

  .page-about .about-eco {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  }

  .page-about .about-rings {
    justify-self: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail {
    scroll-behavior: auto;
  }
}