.page-about {
  --about-wine: var(--wine-900);
  --about-indigo: var(--indigo-900);
  --about-gap: clamp(22px, 3.5vw, 40px);
  background: var(--ink-900);
  color: var(--text-primary);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-top {
  padding-top: clamp(20px, 4vw, 42px);
  padding-bottom: clamp(30px, 5vw, 52px);
}

.page-about .about-kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.page-about .about-kicker::before {
  content: "";
  width: 34px;
  height: 1px;
  background: var(--cyan-400);
}

.page-about .about-h1 {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 7.6vw, 82px);
  line-height: 0.98;
  letter-spacing: -0.01em;
  max-width: 16em;
}

.page-about .about-lede {
  margin: 0;
  max-width: 34em;
  font-size: clamp(15px, 2.1vw, 18px);
  line-height: 1.85;
  color: var(--text-muted);
}

.page-about .chapter-rail {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(22px, 3vw, 34px);
  padding-top: clamp(14px, 2vw, 20px);
  border-top: 1px solid var(--line-soft);
}

.page-about .rail-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-pill);
  color: var(--text-primary);
  font-size: 13px;
  text-decoration: none;
  transition: border-color 160ms var(--ease), background 160ms var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  border-color: var(--cyan-400);
  background: rgba(47, 240, 211, 0.08);
  outline: none;
}

.page-about .rail-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan-400);
}

.page-about .hero-figure {
  margin: clamp(24px, 4vw, 44px) 0 0;
}

.page-about .hero-figure .media-frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line-soft);
}

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

.page-about .media-caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--text-muted);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: clamp(38px, 6vw, 84px) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-chapter--band {
  background: var(--ink-800);
}

.page-about .about-chapter--wine {
  background: var(--about-wine);
}

.page-about .about-chapter--indigo {
  background: var(--about-indigo);
}

.page-about .chapter-head {
  display: flex;
  align-items: flex-start;
  gap: clamp(14px, 3vw, 28px);
  margin-bottom: clamp(20px, 3.4vw, 38px);
}

.page-about .chapter-no {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.6vw, 44px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan-400);
  opacity: 0.85;
}

.page-about .about-chapter .section-title {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 4.4vw, 44px);
  line-height: 1.08;
}

.page-about .about-chapter .label {
  color: var(--cyan-400);
}

.page-about .prose {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-primary);
}

.page-about .about-chapter--wine .prose,
.page-about .about-chapter--indigo .prose {
  color: rgba(232, 245, 240, 0.86);
}

/* ---------- 01 主张 ---------- */
.page-about .stance-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  margin-top: clamp(18px, 3vw, 32px);
}

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

.page-about .stance-item {
  display: flex;
  gap: 14px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .stance-mark {
  flex: 0 0 auto;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--orange-500);
}

.page-about .stance-item h3 {
  margin: 0 0 6px;
  font-size: 16px;
  line-height: 1.5;
  color: var(--text-primary);
}

.page-about .stance-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-muted);
}

.page-about .data-panel {
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid rgba(47, 240, 211, 0.18);
  border-radius: var(--radius-lg);
  background: var(--teal-700);
}

.page-about .data-panel .label {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.page-about .data-list {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .data-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px dashed rgba(156, 189, 177, 0.28);
}

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

.page-about .data-num {
  font-family: var(--font-mono);
  font-size: clamp(21px, 3vw, 30px);
  line-height: 1;
  color: var(--score-cream);
  font-variant-numeric: tabular-nums;
}

.page-about .data-name {
  font-size: 12.5px;
  line-height: 1.6;
  text-align: right;
  color: var(--text-muted);
}

/* ---------- 02 三段节奏 ---------- */
.page-about .phase-svg {
  display: block;
  width: 100%;
  height: auto;
  margin: 0 0 clamp(20px, 3vw, 32px);
}

.page-about .phase-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .phase-card {
  padding: 20px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: var(--ink-900);
  transition: border-color 160ms var(--ease), transform 160ms var(--ease);
}

.page-about .phase-card[data-tone="pre"] {
  border-top: 3px solid var(--cyan-400);
}

.page-about .phase-card[data-tone="live"] {
  border-top: 3px solid var(--mint-400);
}

.page-about .phase-card[data-tone="post"] {
  border-top: 3px solid var(--orange-500);
}

.page-about .phase-card:hover,
.page-about .phase-card:focus-within {
  border-color: var(--cyan-400);
  transform: translateY(-3px);
}

.page-about .phase-card .label {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.page-about .phase-title {
  margin: 10px 0 8px;
  font-size: 17px;
  line-height: 1.45;
  color: var(--text-primary);
}

.page-about .phase-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-muted);
}

.page-about .field-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .field-chips li {
  padding: 5px 10px;
  border: 1px solid rgba(47, 240, 211, 0.28);
  border-radius: var(--radius-pill);
  background: rgba(47, 240, 211, 0.1);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--text-primary);
}

/* ---------- 03 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
}

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

.page-about .team-figure .media-frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line-soft);
}

.page-about .role-list {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .role-card {
  padding: 16px 18px;
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--mint-400);
  border-radius: var(--radius-sm);
  background: var(--ink-800);
}

.page-about .role-name {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mint-400);
}

.page-about .role-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-muted);
}

/* ---------- 04 时间线 ---------- */
.page-about .version-timeline {
  margin-top: clamp(18px, 3vw, 30px);
  padding-left: 28px;
  border-left: 1px solid rgba(255, 231, 204, 0.26);
}

.page-about .version-node {
  position: relative;
  padding-bottom: 26px;
}

.page-about .version-node:last-child {
  padding-bottom: 0;
}

.page-about .version-node::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 12px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--about-wine);
  border: 2px solid var(--orange-500);
}

.page-about .version-node > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 4px 0;
  cursor: pointer;
  list-style: none;
  outline-offset: 4px;
}

.page-about .version-node > summary::-webkit-details-marker {
  display: none;
}

.page-about .version-node > summary:focus-visible {
  outline: 2px solid var(--cyan-400);
}

.page-about .version-year {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1;
  color: var(--score-cream);
  font-variant-numeric: tabular-nums;
}

.page-about .version-title {
  font-size: 15.5px;
  line-height: 1.5;
  color: var(--text-primary);
}

.page-about .version-toggle {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--orange-500);
}

.page-about .version-toggle::after {
  content: "＋";
}

.page-about .version-node[open] .version-toggle::after {
  content: "－";
}

.page-about .version-body {
  max-width: 34em;
  padding-top: 10px;
}

.page-about .version-body p {
  margin: 0 0 8px;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(232, 245, 240, 0.82);
}

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

/* ---------- 05 发布与稳定 ---------- */
.page-about .release-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
}

.page-about .release-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: clamp(18px, 2.6vw, 26px);
}

.page-about .release-stat {
  padding: 14px 16px;
  border: 1px solid rgba(47, 240, 211, 0.16);
  border-radius: var(--radius-md);
  background: rgba(6, 23, 19, 0.5);
}

.page-about .rstat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.6vw, 26px);
  line-height: 1.1;
  color: var(--mint-400);
  font-variant-numeric: tabular-nums;
}

.page-about .rstat-name {
  display: block;
  margin-top: 6px;
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

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

.page-about .release-figure .media-frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line-soft);
}

/* ---------- 06 下一步 ---------- */
.page-about .next-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .next-card {
  padding: 20px;
  border: 1px solid rgba(47, 240, 211, 0.18);
  border-radius: var(--radius-md);
  background: var(--teal-700);
}

.page-about .next-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan-400);
}

.page-about .next-card h3 {
  margin: 8px 0 8px;
  font-size: 17px;
  line-height: 1.45;
  color: var(--text-primary);
}

.page-about .next-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(232, 245, 240, 0.82);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-actions .btn,
.page-about .closing-inner .btn {
  text-decoration: none;
}

.page-about .about-actions .btn:focus-visible,
.page-about .closing-inner .btn:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 3px;
}

/* ---------- 收束 ---------- */
.page-about .closing-band {
  background: var(--ink-800);
  border-top: 1px solid var(--line-soft);
  padding: clamp(28px, 4vw, 44px) 0;
}

.page-about .closing-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.page-about .closing-text {
  margin: 0;
  max-width: 30em;
  font-size: clamp(15px, 2vw, 18px);
  line-height: 1.75;
  color: var(--text-primary);
}

/* ---------- 断点 ---------- */
@media (min-width: 820px) {
  .page-about .phase-grid,
  .page-about .next-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .stance-grid {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: 5fr 7fr;
    align-items: start;
  }

  .page-about .release-grid {
    grid-template-columns: 7fr 5fr;
    align-items: center;
  }
}

@media (min-width: 1080px) {
  .page-about .about-h1 {
    max-width: 14em;
  }

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

@media (max-width: 520px) {
  .page-about .chapter-rail {
    gap: 6px;
  }

  .page-about .rail-link {
    padding: 7px 11px;
    font-size: 12px;
  }

  .page-about .data-row {
    align-items: flex-start;
  }

  .page-about .data-name {
    text-align: left;
  }

  .page-about .release-stats {
    grid-template-columns: 1fr;
  }

  .page-about .about-actions .btn {
    flex: 1 1 100%;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .phase-card,
  .page-about .rail-link {
    transition: none;
  }

  .page-about .phase-card:hover,
  .page-about .phase-card:focus-within {
    transform: none;
  }
}