.page-about {
  --about-cut: 18px;
  --about-soft-cyan: rgba(61, 232, 255, 0.08);
  --about-soft-violet: rgba(140, 92, 255, 0.1);
}

.page-about .about-crumb-sep {
  margin: 0 0.55em;
  color: var(--c-steel);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 18px 0 52px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -18%;
  width: min(560px, 86vw);
  height: min(560px, 86vw);
  background: radial-gradient(circle, rgba(61, 232, 255, 0.15), transparent 66%);
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  max-width: 880px;
}

.page-about .about-hero .display-title {
  margin: 12px 0 18px;
  color: var(--c-white);
  font-size: clamp(30px, 7.2vw, 66px);
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.page-about .about-hero-lede {
  max-width: 60ch;
  margin: 0;
  color: var(--c-mist);
  font-size: 16px;
  line-height: 1.82;
}

.page-about .about-hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 14px;
  margin: 30px 0 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-hero-facts li {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .about-fact-num {
  color: var(--c-cyan);
  font-size: 26px;
  line-height: 1;
  letter-spacing: 0.02em;
}

.page-about .about-fact-label {
  color: var(--c-steel);
  font-size: 12px;
  letter-spacing: 0.04em;
}

/* ---------- 历程年表 ---------- */
.page-about .about-era {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-era-grid {
  display: grid;
  gap: 26px;
}

.page-about .about-era-rail-title {
  margin: 0;
}

.page-about .about-era-nav {
  display: flex;
  gap: 8px;
  margin: 12px 0 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-era-nav li {
  flex: 0 0 auto;
}

.page-about .about-era-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 2px;
  color: var(--c-mist);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 180ms var(--ease), color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .about-era-link .mono {
  color: var(--c-steel);
  font-size: 12px;
}

.page-about .about-era-link:hover,
.page-about .about-era-link:focus-visible {
  border-color: var(--c-cyan);
  background: var(--about-soft-cyan);
  color: var(--c-white);
}

.page-about .about-era-link:hover .mono,
.page-about .about-era-link:focus-visible .mono {
  color: var(--c-cyan);
}

.page-about .about-era-main > .section-heading {
  margin: 0 0 8px;
}

.page-about .about-era-item {
  position: relative;
  padding: 22px 0 22px 18px;
  border-left: 1px solid var(--line-soft);
  transition: border-color 200ms var(--ease), background 200ms var(--ease);
}

.page-about .about-era-item:hover {
  border-left-color: var(--c-steel);
}

.page-about .about-era-item:target {
  border-left-color: var(--c-cyan);
  background: linear-gradient(90deg, rgba(61, 232, 255, 0.07), transparent 72%);
}

.page-about .about-era-year {
  margin: 0 0 4px;
  color: var(--c-steel);
  font-size: clamp(30px, 8vw, 46px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  opacity: 0.55;
  transition: color 200ms var(--ease), opacity 200ms var(--ease);
}

.page-about .about-era-item:target .about-era-year {
  color: var(--c-cyan);
  opacity: 1;
}

.page-about .about-era-item h3 {
  margin: 0 0 10px;
  color: var(--c-white);
  font-family: var(--f-struct);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.page-about .about-era-text {
  margin: 0;
  color: var(--c-mist);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .about-era-figure {
  margin: 22px 0 0;
}

.page-about .about-era-figure img {
  width: 100%;
  object-fit: cover;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-team-lede {
  max-width: 66ch;
  margin: 12px 0 0;
}

.page-about .about-team-grid {
  display: grid;
  gap: 24px;
  margin-top: 30px;
}

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

.page-about .about-team-figure img {
  width: 100%;
  object-fit: cover;
}

.page-about .about-org {
  display: grid;
  gap: 12px;
}

.page-about .about-role {
  position: relative;
  padding: 15px 16px 16px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--about-band, var(--c-cyan));
  background: rgba(18, 33, 58, 0.78);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
  outline: none;
  transition: background 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-visible {
  background: rgba(18, 33, 58, 1);
  border-color: var(--about-band, var(--c-cyan));
}

.page-about .about-role-code {
  margin: 0 0 4px;
  color: var(--about-band, var(--c-cyan));
  font-size: 11px;
  letter-spacing: 0.12em;
}

.page-about .about-role-title {
  margin: 0;
  color: var(--c-white);
  font-family: var(--f-struct);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-role-duty {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  color: var(--c-mist);
  font-size: 13px;
  line-height: 1.7;
  transition: max-height 220ms var(--ease), opacity 220ms var(--ease), margin-top 220ms var(--ease);
}

.page-about .about-role:hover .about-role-duty,
.page-about .about-role:focus-visible .about-role-duty {
  max-height: 8em;
  margin-top: 8px;
  opacity: 1;
}

.page-about .about-role--data { --about-band: var(--c-cyan); }
.page-about .about-role--east { --about-band: var(--c-region-east); }
.page-about .about-role--south { --about-band: var(--c-region-south); }
.page-about .about-role--north { --about-band: var(--c-region-north); }
.page-about .about-role--central { --about-band: var(--c-region-central); }
.page-about .about-role--southwest { --about-band: var(--c-region-southwest); }

@media (hover: none) {
  .page-about .about-role-duty {
    max-height: none;
    margin-top: 8px;
    opacity: 1;
  }
}

/* ---------- 生产流程 ---------- */
.page-about .about-flow-section {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-flow-lede {
  max-width: 62ch;
  margin: 12px 0 0;
}

.page-about .about-flow {
  display: grid;
  gap: 12px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow-step {
  position: relative;
  padding: 20px 18px 22px;
  background: linear-gradient(152deg, rgba(18, 33, 58, 0.96), rgba(11, 20, 36, 0.94));
  border-top: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
  transition: background 180ms var(--ease);
}

.page-about .about-flow-step:hover {
  background: linear-gradient(152deg, rgba(23, 41, 70, 0.98), rgba(11, 20, 36, 0.96));
}

.page-about .about-flow-node {
  display: inline-block;
  margin-bottom: 8px;
  color: var(--c-cyan);
  font-size: 12px;
  letter-spacing: 0.14em;
}

.page-about .about-flow-step h3 {
  margin: 0 0 8px;
  color: var(--c-white);
  font-family: var(--f-struct);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-flow-step p {
  margin: 0;
  color: var(--c-mist);
  font-size: 14px;
  line-height: 1.75;
}

.page-about .about-flow-step details {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
}

.page-about .about-flow-step summary {
  color: var(--c-violet);
  font-size: 12px;
  letter-spacing: 0.04em;
  cursor: pointer;
  list-style: none;
}

.page-about .about-flow-step summary::-webkit-details-marker {
  display: none;
}

.page-about .about-flow-step summary::before {
  content: "+";
  display: inline-block;
  width: 1em;
  color: var(--c-violet);
}

.page-about .about-flow-step details[open] summary::before {
  content: "−";
}

.page-about .about-flow-step summary:hover {
  color: var(--c-cyan);
}

.page-about .about-flow-step details p {
  margin-top: 8px;
  color: var(--c-steel);
  font-size: 13px;
}

.page-about .about-flow-figure {
  margin: 26px 0 0;
}

.page-about .about-flow-figure img {
  width: 100%;
  object-fit: cover;
}

/* ---------- 规模 Bento ---------- */
.page-about .about-scale {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-scale-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-scale-cell {
  padding: 18px 16px 20px;
  background: rgba(18, 33, 58, 0.72);
}

.page-about .about-scale-code {
  margin: 0 0 10px;
  color: var(--c-steel);
  font-size: 11px;
  letter-spacing: 0.1em;
}

.page-about .about-scale-num {
  margin: 0;
  color: var(--c-white);
  font-size: clamp(34px, 9vw, 60px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
}

.page-about .about-scale-num span {
  margin-left: 2px;
  color: var(--c-cyan);
  font-size: 0.48em;
}

.page-about .about-scale-label {
  margin: 10px 0 0;
  color: var(--c-mist);
  font-size: 13px;
  line-height: 1.6;
}

.page-about .about-scale-cell--xl {
  grid-column: 1 / -1;
  border-left: 2px solid var(--c-cyan);
}

.page-about .about-scale-cell--pulse {
  border-left: 2px solid var(--c-amber);
}

.page-about .about-column-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-column-list li {
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 2px;
  color: var(--c-mist);
  font-size: 12px;
  letter-spacing: 0.04em;
}

/* ---------- 合作与认可 ---------- */
.page-about .about-partners {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-partners-grid {
  display: grid;
  gap: 24px;
}

.page-about .about-partners-lede {
  max-width: 56ch;
  margin: 12px 0 0;
  color: var(--c-mist);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .about-partner-list {
  display: grid;
  gap: 16px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-partner-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-soft);
  color: var(--c-mist);
  font-size: 15px;
  line-height: 1.75;
}

.page-about .about-partner-num {
  color: var(--c-cyan);
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
}

.page-about .about-award {
  padding: 22px 20px 24px;
  border-left: 2px solid var(--c-violet);
  background: linear-gradient(160deg, var(--about-soft-violet), rgba(18, 33, 58, 0.5) 62%);
}

.page-about .about-award-year {
  margin: 0 0 8px;
  color: var(--c-violet);
  font-size: 12px;
  letter-spacing: 0.14em;
}

.page-about .about-award-title {
  margin: 0 0 12px;
  color: var(--c-white);
  font-family: var(--f-display);
  font-size: clamp(22px, 4vw, 28px);
  font-weight: 700;
  line-height: 1.24;
  letter-spacing: -0.01em;
}

.page-about .about-award-text {
  margin: 0;
  color: var(--c-mist);
  font-size: 14px;
  line-height: 1.78;
}

/* ---------- 固定战队观众 ---------- */
.page-about .about-audience {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-audience-grid {
  display: grid;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-audience-card {
  position: relative;
  padding: 22px 18px 24px;
  border: 1px solid var(--line);
  background: rgba(11, 20, 36, 0.82);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .about-audience-card:hover {
  border-color: var(--c-violet);
  background: rgba(18, 33, 58, 0.9);
}

.page-about .about-audience-code {
  margin: 0 0 10px;
  color: var(--c-violet);
  font-size: 11px;
  letter-spacing: 0.12em;
}

.page-about .about-audience-card h3 {
  margin: 0 0 10px;
  color: var(--c-white);
  font-family: var(--f-struct);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.34;
  letter-spacing: -0.01em;
}

.page-about .about-audience-card p {
  margin: 0;
  color: var(--c-mist);
  font-size: 14px;
  line-height: 1.78;
}

.page-about .about-audience-link {
  display: inline-block;
  margin-top: 14px;
  color: var(--c-cyan);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-decoration: none;
}

.page-about .about-audience-note {
  margin: 22px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
  color: var(--c-steel);
  font-size: 14px;
  line-height: 1.8;
}

/* ---------- 收口 ---------- */
.page-about .about-cta-panel {
  display: grid;
  gap: 22px;
  padding: 26px 20px 28px;
  background: linear-gradient(140deg, rgba(18, 33, 58, 0.96), rgba(11, 20, 36, 0.96) 68%);
}

.page-about .about-cta-title {
  margin: 0 0 10px;
  color: var(--c-white);
  font-family: var(--f-display);
  font-size: clamp(24px, 5vw, 34px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.page-about .about-cta-text p {
  margin: 0;
  max-width: 52ch;
  color: var(--c-mist);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 中等屏 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-role--data {
    grid-column: 1 / -1;
  }

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

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 28px 0 72px;
  }

  .page-about .about-era-grid {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-era-rail {
    position: sticky;
    top: 140px;
  }

  .page-about .about-era-nav {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-era-nav li {
    flex: 1 1 auto;
  }

  .page-about .about-era-link {
    width: 100%;
    box-sizing: border-box;
  }

  .page-about .about-era-item {
    padding: 26px 0 26px 26px;
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 10px;
  }

  .page-about .about-flow-step {
    padding: 24px 18px 26px;
    clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
  }

  .page-about .about-scale-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-scale-cell--xl { grid-column: span 4; }
  .page-about .about-scale-cell--lg { grid-column: span 2; }
  .page-about .about-scale-cell--md { grid-column: span 2; }
  .page-about .about-scale-cell--wide { grid-column: span 3; }

  .page-about .about-partners-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 40px;
    align-items: start;
  }

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

  .page-about .about-cta-panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 34px 32px 36px;
  }

  .page-about .about-cta-actions {
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-era-link,
  .page-about .about-era-item,
  .page-about .about-era-year,
  .page-about .about-role,
  .page-about .about-role-duty,
  .page-about .about-flow-step,
  .page-about .about-audience-card {
    transition: none;
  }
}