.page-about {
  --about-panel: #12161C;
  --about-panel-deep: #0E1218;
  --about-edge: #262D36;
  display: block;
  min-width: 0;
}

.page-about .container,
.page-about .about-hero-grid,
.page-about .about-team-grid,
.page-about .about-night-grid,
.page-about .about-nav-map {
  min-width: 0;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding-top: 28px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 190px;
  height: 190px;
  background: linear-gradient(135deg, rgba(255, 138, 61, 0.22), rgba(255, 138, 61, 0) 70%);
  clip-path: polygon(0 0, 100% 0, 0 100%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -60px;
  top: 120px;
  width: 260px;
  height: 10px;
  background: linear-gradient(90deg, rgba(41, 224, 200, 0), rgba(41, 224, 200, 0.55));
  transform: rotate(-28deg);
  pointer-events: none;
}

.page-about .about-hero-grid {
  display: grid;
  gap: 30px;
  margin-top: 22px;
  position: relative;
  z-index: 1;
}

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

.page-about .about-hero-main h1 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-size: clamp(32px, 7vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--mist);
  max-width: 16em;
}

.page-about .about-lede {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-lede--sub {
  margin-top: 12px;
  color: var(--muted);
  font-size: 16px;
}

.page-about .about-hero-side {
  position: relative;
  background: var(--about-panel);
  border: 1px solid var(--about-edge);
  padding: 20px 20px 22px;
  overflow: hidden;
}

.page-about .about-hero-side::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 18px;
  height: 18px;
  background: var(--cut);
  border-left: 1px solid var(--about-edge);
  border-bottom: 1px solid var(--about-edge);
}

.page-about .about-side-title {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .about-stat-list {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
}

.page-about .about-stat {
  display: grid;
  grid-template-columns: 5.6em minmax(0, 1fr);
  align-items: baseline;
  gap: 12px;
  padding: 13px 0;
  border-bottom: 1px dashed var(--about-edge);
}

.page-about .about-stat:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
  text-shadow: var(--glow-amber);
  letter-spacing: -0.01em;
}

.page-about .about-stat-num small {
  font-size: 13px;
  margin-left: 2px;
  color: var(--orange);
  text-shadow: none;
}

.page-about .about-stat-label {
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 历程时间轴 ---------- */

.page-about .about-history .section-head {
  max-width: 46em;
}

.page-about .about-history-figure {
  margin-top: 28px;
  border: 1px solid var(--about-edge);
  background: var(--about-panel-deep);
}

.page-about .about-track {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
  position: relative;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 0;
  top: -18px;
  width: 84px;
  height: 2px;
  background: linear-gradient(90deg, var(--orange), rgba(255, 138, 61, 0));
}

.page-about .about-node {
  position: relative;
  padding: 20px 20px 22px;
  background: linear-gradient(180deg, var(--about-panel-deep), var(--about-panel));
  border: 1px solid var(--about-edge);
  border-top: 2px solid var(--cyan);
  transition: border-color 0.18s var(--ease), box-shadow 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .about-node:hover {
  border-color: var(--cyan);
  box-shadow: var(--glow-cyan);
}

.page-about .about-node-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--blue);
  margin-bottom: 10px;
}

.page-about .about-node-title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 20px;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .about-node-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 团队 ---------- */

.page-about .about-team-grid {
  display: grid;
  gap: 30px;
  align-items: start;
}

.page-about .about-team-visual .figure-frame {
  border: 1px solid var(--about-edge);
}

.page-about .about-team-visual .figure-cap {
  margin-top: 10px;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
}

.page-about .about-team-body .section-head {
  margin-bottom: 24px;
}

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

.page-about .about-role {
  position: relative;
  padding: 18px 18px 20px;
  background: var(--about-panel-deep);
  border: 1px solid var(--about-edge);
  border-left: 3px solid var(--graphite);
  transition: border-left-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-about .about-role:hover {
  border-left-color: var(--cyan);
  box-shadow: var(--glow-cyan);
}

.page-about .about-role-idx {
  display: block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
  margin-bottom: 10px;
}

.page-about .about-role-title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .about-role-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 导航节点图 ---------- */

.page-about .about-navmap .section-head {
  max-width: 48em;
}

.page-about .about-nav-map {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  position: relative;
}

.page-about .about-nav-map > li {
  min-width: 0;
}

.page-about .about-nav-node {
  position: relative;
  display: block;
  height: 100%;
  padding: 18px 18px 18px 24px;
  background: var(--about-panel);
  border: 1px solid var(--about-edge);
  text-decoration: none;
  transition: border-color 0.18s var(--ease), box-shadow 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .about-nav-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 3px;
  background: var(--graphite);
  transition: background 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-about .about-nav-node:hover,
.page-about .about-nav-node:focus-visible {
  border-color: var(--cyan);
  box-shadow: var(--glow-cyan);
  transform: translateY(-2px);
}

.page-about .about-nav-node:hover::before,
.page-about .about-nav-node:focus-visible::before {
  background: var(--cyan);
  box-shadow: var(--glow-cyan);
}

.page-about .about-nav-name {
  display: block;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--mist);
  margin-bottom: 8px;
}

.page-about .about-nav-desc {
  display: block;
  font-size: 14px;
  line-height: 1.68;
  color: var(--muted);
}

.page-about .about-nav-tip {
  margin-top: 26px;
  display: grid;
  gap: 16px;
  align-items: center;
}

.page-about .about-nav-tip p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 内容共建 ---------- */

.page-about .about-night-grid {
  display: grid;
  gap: 30px;
  align-items: start;
}

.page-about .about-night-body .section-head {
  margin-bottom: 22px;
}

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

.page-about .about-night-list li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-night-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 2px;
  background: var(--violet);
}

.page-about .about-pass {
  margin-top: 26px;
  padding: 22px 22px 24px;
  background: linear-gradient(160deg, rgba(255, 138, 61, 0.12), rgba(122, 91, 255, 0.08) 60%, rgba(10, 12, 16, 0));
  border: 1px solid var(--about-edge);
  border-left: 2px solid var(--orange);
}

.page-about .about-pass-title {
  margin: 12px 0 8px;
  font-family: var(--font-head);
  font-size: 22px;
  letter-spacing: -0.01em;
  color: var(--amber);
}

.page-about .about-pass-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-pass-link {
  display: inline-block;
  margin-top: 14px;
  font-size: 14px;
  font-weight: 700;
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 189, 245, 0.4);
  padding-bottom: 2px;
}

.page-about .about-pass-link:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-night-visual .figure-frame {
  border: 1px solid var(--about-edge);
}

/* ---------- 更新节奏 ---------- */

.page-about .about-cadence-list {
  margin-top: 26px;
  border-bottom: 1px solid var(--about-edge);
}

.page-about .about-cadence-row {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-top: 1px solid var(--about-edge);
}

.page-about .about-cadence-key {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-cadence-val {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-cadence-note {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--muted);
}

.page-about .about-end {
  margin-top: 34px;
  padding-top: 26px;
  border-top: 1px solid var(--about-edge);
  display: grid;
  gap: 18px;
}

.page-about .about-end-text {
  margin: 0;
  font-size: 16px;
  line-height: 1.72;
  color: var(--mist);
}

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

.page-about .about-end-actions .btn {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-role-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-nav-tip {
    grid-template-columns: minmax(0, 1fr) auto;
    justify-content: space-between;
  }

  .page-about .about-nav-tip .btn {
    justify-self: end;
  }
}

@media (min-width: 760px) {
  .page-about .about-nav-map {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-cadence-row {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }

  .page-about .about-end {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 24px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 40px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-hero-side {
    padding: 24px 24px 26px;
  }

  .page-about .about-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-node:nth-child(even) {
    margin-top: 30px;
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 48px;
  }

  .page-about .about-night-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 48px;
    align-items: center;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero-side {
    margin-right: -16px;
  }

  .page-about .about-node {
    padding: 22px 22px 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-role,
  .page-about .about-nav-node {
    transition: none;
  }

  .page-about .about-nav-node:hover,
  .page-about .about-nav-node:focus-visible {
    transform: none;
  }
}