.page-about {
  --about-rail: 116px;
  --about-dot: 11px;
  --about-line: var(--line-blue);
  --about-max: 68ch;
  color: var(--ink-text);
}

/* ============ 面包屑 ============ */
.page-about .breadcrumb {
  margin: 28px 0 20px;
}

/* ============ 首屏：酒红斜切到深空底 ============ */
.page-about .about-hero {
  position: relative;
  background:
    radial-gradient(120% 140% at 12% 0%, rgba(139, 92, 246, 0.22) 0%, transparent 58%),
    linear-gradient(180deg, var(--wine) 0%, #2A0C1A 62%, var(--ink-void) 100%);
  padding: 40px 0 96px;
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 78px;
  background: var(--ink-void);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .eyebrow {
  color: var(--alert-orange);
}

.page-about .about-hero .h-display {
  margin: 14px 0 20px;
  font-size: clamp(34px, 8.4vw, 76px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.page-about .about-hero .lede {
  max-width: var(--about-max);
  color: var(--ink-mist);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 34px 0 0;
  padding: 0;
}

.page-about .about-hero__stat {
  border-top: 1px solid rgba(232, 238, 247, 0.18);
  padding-top: 12px;
}

.page-about .about-hero__stat dt {
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-mist);
}

.page-about .about-hero__stat dd {
  margin: 8px 0 0;
  font-size: 24px;
  line-height: 1.1;
  color: var(--ink-text);
}

/* ============ 章节目录 ============ */
.page-about .about-toc {
  position: sticky;
  top: 0;
  z-index: 6;
  background: rgba(5, 11, 24, 0.92);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--line-blue);
  border-bottom: 1px solid var(--line-blue);
}

.page-about .about-toc__list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 10px var(--pad-x);
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-about .about-toc__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--line-blue);
  font-size: 13px;
  color: var(--ink-mist);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-toc__list a .mono {
  font-size: 11px;
  color: var(--neon-violet);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--ink-text);
  border-color: var(--electric-cyan);
  background: rgba(34, 211, 238, 0.08);
}

/* ============ 通用区块 ============ */
.page-about .about-block {
  padding: 56px 0 8px;
}

.page-about .about-block .section__head {
  max-width: 76ch;
}

.page-about .about-block .h2 {
  margin: 12px 0 18px;
  font-size: clamp(24px, 5.4vw, 36px);
  line-height: 1.18;
  text-wrap: balance;
}

.page-about .about-block__intro {
  max-width: var(--about-max);
  color: var(--ink-mist);
  font-size: 16px;
  line-height: 1.85;
}

/* ============ 时间轴 ============ */
.page-about .about-timeline {
  list-style: none;
  margin: 44px 0 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 34px 28px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 30px;
  bottom: -6px;
  width: 1px;
  background: linear-gradient(180deg, var(--neon-violet) 0%, var(--line-blue) 60%, transparent 100%);
}

.page-about .about-timeline__item:last-child::before {
  display: none;
}

.page-about .about-timeline__dust {
  position: absolute;
  left: 0;
  top: 20px;
  width: var(--about-dot);
  height: var(--about-dot);
  border-radius: 50%;
  background: var(--neon-violet);
  box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.16);
  transition: box-shadow 0.25s ease, background-color 0.25s ease;
}

.page-about .about-timeline__year {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 10px;
}

.page-about .about-timeline__year .mono {
  font-size: 22px;
  line-height: 1;
  color: var(--electric-cyan);
  letter-spacing: -0.01em;
}

.page-about .about-timeline__phase {
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-mist);
}

.page-about .about-timeline__body {
  padding: 20px 20px 22px;
  border-radius: var(--radius);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-timeline__item:hover .about-timeline__dust,
.page-about .about-timeline__item:focus-within .about-timeline__dust {
  background: var(--alert-orange);
  box-shadow: 0 0 0 6px rgba(255, 122, 26, 0.18);
}

.page-about .about-timeline__item:hover .about-timeline__body,
.page-about .about-timeline__item:focus-within .about-timeline__body {
  transform: translateY(-2px);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.42);
}

.page-about .about-timeline__body .h3 {
  margin: 0 0 10px;
  font-size: 19px;
  line-height: 1.35;
}

.page-about .about-timeline__body > p {
  margin: 0;
  max-width: var(--about-max);
  color: var(--ink-mist);
  font-size: 15px;
  line-height: 1.82;
}

.page-about .about-timeline__points {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .about-timeline__points li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-text);
}

.page-about .about-timeline__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 1px;
  background: var(--electric-cyan);
}

/* ============ 图片 ============ */
.page-about .about-figure {
  margin: 40px 0 0;
}

.page-about .about-figure figcaption {
  margin-top: 12px;
  max-width: var(--about-max);
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-mist);
}

.page-about .media-frame {
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line-blue);
  background: var(--ink-hull);
}

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

/* ============ 团队分工折叠表 ============ */
.page-about .about-roles {
  margin: 40px 0 0;
  border-top: 1px solid var(--line-blue);
}

.page-about .about-roles__row {
  border-bottom: 1px solid var(--line-blue);
}

.page-about .about-roles__row .fold__head {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 0;
}

.page-about .about-roles__row .fold__index {
  font-size: 12px;
  color: var(--neon-violet);
  letter-spacing: 0.08em;
  flex: 0 0 auto;
}

.page-about .about-roles__row .h3 {
  margin: 0;
  flex: 1 1 auto;
  font-size: 18px;
  line-height: 1.3;
}

.page-about .about-roles__row .h3 .mono {
  color: var(--alert-orange);
  font-size: 16px;
}

.page-about .about-roles__row .fold__trigger {
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--line-blue);
  background: transparent;
  color: var(--electric-cyan);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-roles__row .fold__trigger:hover,
.page-about .about-roles__row .fold__trigger:focus-visible {
  border-color: var(--electric-cyan);
  background: rgba(34, 211, 238, 0.1);
  transform: translateY(-2px);
}

.page-about .about-roles__row .fold__body {
  padding: 0 0 24px 0;
}

.page-about .about-roles__row .fold__body ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-roles__row .fold__body li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-mist);
  max-width: var(--about-max);
}

.page-about .about-roles__row .fold__body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 9px;
  height: 1px;
  background: var(--neon-violet);
}

/* ============ 校对节奏：靛紫斜切带 ============ */
.page-about .about-band {
  position: relative;
  margin-top: 56px;
  padding: 92px 0 60px;
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(139, 92, 246, 0.18) 0%, transparent 60%),
    var(--indigo);
}

.page-about .about-band::before {
  content: "";
  position: absolute;
  inset: -1px 0 auto 0;
  height: 76px;
  background: var(--ink-void);
  clip-path: polygon(0 0, 100% 0, 0 100%);
  pointer-events: none;
}

.page-about .about-band .section__head {
  max-width: 76ch;
}

.page-about .about-band .eyebrow {
  color: var(--electric-cyan);
}

.page-about .about-band .h2 {
  margin: 12px 0 18px;
  font-size: clamp(24px, 5.4vw, 36px);
  line-height: 1.18;
  text-wrap: balance;
}

.page-about .about-band .about-block__intro {
  max-width: var(--about-max);
  color: var(--ink-mist);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .about-rhythm {
  list-style: none;
  margin: 42px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-blue);
  border: 1px solid var(--line-blue);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-rhythm__slot {
  background: var(--ink-hull);
  padding: 22px 20px 24px;
  transition: background-color 0.25s ease;
}

.page-about .about-rhythm__slot:hover {
  background: #101F36;
}

.page-about .about-rhythm__time {
  margin: 0;
  font-size: 26px;
  line-height: 1;
  color: var(--alert-orange);
  letter-spacing: -0.01em;
}

.page-about .about-rhythm__slot .h3 {
  margin: 12px 0 8px;
  font-size: 17px;
  line-height: 1.35;
}

.page-about .about-rhythm__slot p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-mist);
}

.page-about .about-band__note {
  max-width: var(--about-max);
  margin: 32px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--neon-violet);
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-text);
}

/* ============ 协同生态 ============ */
.page-about .about-net-wrap {
  margin-top: 40px;
  display: grid;
  gap: 32px;
}

.page-about .about-net {
  width: 100%;
  max-width: 380px;
  height: auto;
  margin: 0 auto;
  display: block;
}

.page-about .about-net-legend {
  display: grid;
  gap: 22px;
}

.page-about .about-net-legend__item .h3 {
  margin: 10px 0 8px;
  font-size: 17px;
  line-height: 1.35;
}

.page-about .about-net-legend__item p {
  margin: 0;
  max-width: var(--about-max);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-mist);
}

/* ============ 品类覆盖 ============ */
.page-about .about-genres {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-blue);
  border: 1px solid var(--line-blue);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-genres__item {
  background: var(--ink-void);
  padding: 20px 18px 22px;
  transition: background-color 0.25s ease;
}

.page-about .about-genres__item:hover {
  background: #08111F;
}

.page-about .about-genres__item .h3 {
  margin: 0 0 8px;
  font-size: 16px;
  line-height: 1.3;
  color: var(--ink-text);
}

.page-about .about-genres__item .h3::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 10px;
  border-radius: 50%;
  background: var(--ok-green);
  vertical-align: middle;
}

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

/* ============ 结尾行动区 ============ */
.page-about .about-cta {
  margin-top: 64px;
  padding: 52px 0 64px;
  background:
    linear-gradient(135deg, rgba(139, 92, 246, 0.16) 0%, transparent 52%),
    var(--ink-hull);
  border-top: 1px solid var(--line-blue);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 28px;
}

.page-about .about-cta__text .eyebrow {
  color: var(--neon-violet);
}

.page-about .about-cta__text .h2 {
  margin: 12px 0 14px;
  font-size: clamp(23px, 5.2vw, 32px);
  line-height: 1.2;
  text-wrap: balance;
}

.page-about .about-cta__text p:last-child {
  margin: 0;
  max-width: var(--about-max);
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-mist);
}

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

/* ============ 平板 ============ */
@media (min-width: 640px) {
  .page-about .about-genres {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .about-net-wrap {
    grid-template-columns: minmax(0, 320px) minmax(0, 1fr);
    align-items: start;
    gap: 40px;
  }

  .page-about .about-net {
    margin: 0;
  }

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

/* ============ 桌面：左侧时间轴 + 右侧叙述 ============ */
@media (min-width: 900px) {
  .page-about {
    --about-rail: 108px;
  }

  .page-about .about-hero {
    padding: 60px 0 116px;
  }

  .page-about .about-hero::after {
    height: 104px;
  }

  .page-about .about-block {
    padding: 72px 0 12px;
  }

  .page-about .about-timeline {
    margin-top: 56px;
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 0;
    padding: 0 0 52px 0;
  }

  .page-about .about-timeline__item::before {
    left: calc(var(--about-rail) - 1px);
    top: 14px;
    bottom: -10px;
  }

  .page-about .about-timeline__dust {
    left: calc(var(--about-rail) - 6px);
    top: 8px;
  }

  .page-about .about-timeline__year {
    flex-direction: column;
    align-items: flex-end;
    gap: 6px;
    margin: 0;
    padding-right: 34px;
    padding-top: 4px;
    text-align: right;
  }

  .page-about .about-timeline__year .mono {
    font-size: 26px;
  }

  .page-about .about-timeline__body {
    padding: 24px 28px 26px;
  }

  .page-about .about-timeline__body .h3 {
    font-size: 21px;
  }

  .page-about .about-timeline__body > p {
    font-size: 15.5px;
  }

  .page-about .about-timeline__points {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 28px;
  }

  .page-about .about-figure {
    margin-top: 48px;
  }

  .page-about .about-roles {
    margin-top: 48px;
  }

  .page-about .about-roles__row .fold__head {
    padding: 24px 0;
    gap: 28px;
  }

  .page-about .about-roles__row .h3 {
    font-size: 20px;
  }

  .page-about .about-roles__row .fold__body {
    padding: 0 0 30px 0;
  }

  .page-about .about-roles__row .fold__body ul {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 36px;
  }

  .page-about .about-band {
    margin-top: 72px;
    padding: 116px 0 76px;
  }

  .page-about .about-band::before {
    height: 96px;
  }

  .page-about .about-rhythm {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 48px;
  }

  .page-about .about-genres {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-top: 48px;
  }

  .page-about .about-net-wrap {
    grid-template-columns: minmax(0, 400px) minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .about-cta {
    margin-top: 84px;
    padding: 68px 0 76px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__dust,
  .page-about .about-timeline__body,
  .page-about .about-roles__row .fold__trigger {
    transition: none;
  }

  .page-about .about-timeline__item:hover .about-timeline__body,
  .page-about .about-timeline__item:focus-within .about-timeline__body {
    transform: none;
  }
}
<<<END>>>