.page-about {
  background: var(--ink-900);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(24px, 4vw, 44px);
  padding-bottom: clamp(36px, 6vw, 72px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -110px;
  right: -160px;
  width: min(640px, 78%);
  height: 460px;
  background: linear-gradient(135deg, rgba(0, 229, 199, 0.13), rgba(139, 92, 246, 0.09) 58%, transparent 88%);
  transform: rotate(-8deg);
  transform-origin: top right;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero .tb-shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
  margin-top: 22px;
}

.page-about .about-hero__lead h1 {
  margin: 12px 0 0;
  max-width: 20ch;
}

.page-about .about-hero__lead .tb-lede {
  margin-top: 18px;
  max-width: 62ch;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(26px, 3vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-hero__facts li {
  border-top: 2px solid var(--line);
  padding-top: 12px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 8px;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.6vw, 46px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-fact__unit {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-fact__label {
  flex: 1 0 100%;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
}

.page-about .about-hero__peek {
  border: 2px solid var(--line);
  background: var(--ink-800);
  box-shadow: var(--shadow-2);
  padding: clamp(18px, 2.4vw, 28px);
}

.page-about .about-hero__peek-title {
  margin: 0 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--line);
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-axis-svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-axis-svg__track {
  stroke: var(--line);
  stroke-width: 2;
  stroke-dasharray: 7 7;
}

.page-about .about-axis-svg__node {
  fill: var(--cyan);
}

.page-about .about-axis-svg__node--last {
  fill: var(--orange);
}

.page-about .about-axis-svg__year {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  fill: var(--text);
}

.page-about .about-axis-svg__desc {
  font-family: var(--font-body);
  font-size: 12px;
  fill: var(--muted);
}

/* ---------- 赛季轴主干 ---------- */
.page-about .about-spine {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  padding-bottom: clamp(48px, 7vw, 88px);
}

.page-about .about-spine__nav {
  position: relative;
  z-index: 2;
}

.page-about .about-spine__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

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

.page-about .about-spine__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 14px;
  border: 2px solid var(--line);
  background: var(--ink-800);
  color: var(--muted);
  font-size: 14px;
  white-space: nowrap;
  text-decoration: none;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .about-spine__link:hover {
  color: var(--cyan);
  border-color: var(--cyan);
  background: var(--ink-700);
}

.page-about .about-spine__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-spine__body {
  min-width: 0;
}

/* ---------- 阶段块 ---------- */
.page-about .about-stage {
  padding-top: clamp(30px, 5vw, 56px);
  margin-top: clamp(30px, 5vw, 56px);
  border-top: 2px solid var(--line);
  scroll-margin-top: calc(var(--main-h) + 28px);
}

.page-about .about-stage:first-child {
  padding-top: 0;
  margin-top: 0;
  border-top: 0;
}

.page-about .about-stage__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .about-badge {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 46px;
  height: 46px;
  border: 2px solid var(--cyan);
  background: rgba(0, 229, 199, 0.08);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.04em;
  box-shadow: var(--shadow-1);
}

.page-about .about-stage__head h2 {
  margin: 0;
  padding-top: 2px;
}

.page-about .about-stage .tb-prose {
  max-width: 68ch;
}

.page-about .about-stage__media {
  margin: 22px 0 0;
  border: 2px solid var(--line);
}

.page-about .about-stage__media img,
.page-about .about-band img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--ink-700);
}

.page-about .about-stage__media .tb-media__cap,
.page-about .about-band .tb-media__cap {
  border-top: 2px solid var(--line);
  background: var(--ink-800);
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 赛季阶段清单 ---------- */
.page-about .about-era {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  border-top: 2px solid var(--line);
}

.page-about .about-era__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 2px solid var(--line);
}

.page-about .about-era__year {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-era__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: 0.01em;
  color: var(--text);
}

.page-about .about-era__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--muted);
  max-width: 62ch;
}

/* ---------- 四道工序 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-flow__step {
  position: relative;
  border: 2px solid var(--line);
  background: var(--ink-700);
  padding: 18px 18px 20px;
  box-shadow: var(--shadow-1);
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-about .about-flow__step:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
  box-shadow: var(--shadow-2);
}

.page-about .about-flow__step:focus-visible {
  border-color: var(--violet);
}

.page-about .about-flow__idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 26px;
  margin-bottom: 12px;
  border: 2px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
}

.page-about .about-flow__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 21px;
  letter-spacing: 0.01em;
  color: var(--text);
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-flow__sla {
  margin: 14px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--muted);
  transition: color 0.18s var(--ease);
}

.page-about .about-flow__step:hover .about-flow__sla,
.page-about .about-flow__step:focus-visible .about-flow__sla {
  color: var(--cyan);
}

.page-about .about-pipeline-media {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 30px;
}

.page-about .about-pipeline-media .about-stage__media {
  margin: 0;
}

.page-about .about-pipeline-note {
  border-left: 4px solid var(--orange);
  padding: 2px 0 2px 18px;
}

.page-about .about-pipeline-note__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: 0.01em;
  color: var(--orange);
}

.page-about .about-pipeline-note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--muted);
  max-width: 60ch;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 26px;
}

.page-about .about-team__figures {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-team__figure {
  border: 2px solid var(--line);
  background: var(--ink-800);
  padding: 20px;
  box-shadow: var(--shadow-1);
}

.page-about .about-team__figure--alt {
  border-left: 4px solid var(--violet);
}

.page-about .about-team__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(44px, 7vw, 64px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .about-team__cap {
  display: block;
  margin-top: 8px;
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-team__figure p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-team__roles {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--line);
}

.page-about .about-team__roles li {
  position: relative;
  padding: 14px 0 14px 20px;
  border-bottom: 2px solid var(--line);
  font-size: 15px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-team__roles li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  width: 10px;
  height: 2px;
  background: var(--cyan);
}

.page-about .about-team__roles strong {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-display);
  font-size: 17px;
  letter-spacing: 0.01em;
  color: var(--text);
}

/* ---------- 赛季资产 ---------- */
.page-about .about-assets {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 26px;
}

.page-about .about-asset {
  border: 2px solid var(--line);
  border-top: 4px solid var(--cyan);
  background: var(--ink-800);
  padding: 22px 20px;
}

.page-about .about-asset__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(36px, 5.4vw, 52px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--text);
}

.page-about .about-asset__cap {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-asset p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-band {
  margin: clamp(30px, 5vw, 48px) 0 0;
  border: 2px solid var(--line);
}

/* ---------- 合作与认可 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 26px;
}

.page-about .about-partners .tb-card__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: 0.01em;
}

.page-about .about-partners .tb-card__body {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 季票档案 ---------- */
.page-about .about-ticket {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-top: 24px;
  border: 2px solid var(--line);
  background: var(--ink-800);
}

.page-about .about-ticket__cell {
  padding: 20px;
  border-bottom: 2px solid var(--line);
}

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

.page-about .about-ticket__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: 0.01em;
  color: var(--cyan);
}

.page-about .about-ticket__cell p {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-ticket__more {
  margin: 18px 0 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .about-inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 2px solid rgba(0, 229, 199, 0.4);
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

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

/* ---------- 页尾引导 ---------- */
.page-about .about-cta {
  border-top: 2px solid var(--line);
  background: var(--ink-800);
}

.page-about .about-cta__head h2 {
  margin: 10px 0 0;
}

.page-about .about-cta__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 28px;
}

.page-about .about-cta__card {
  display: block;
  text-decoration: none;
  color: inherit;
}

.page-about .about-cta__kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-cta__title {
  display: block;
  margin-top: 10px;
  font-family: var(--font-display);
  font-size: 22px;
  line-height: 1.25;
  color: var(--text);
}

.page-about .about-cta__note {
  display: block;
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-cta__arrow {
  display: block;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--cyan);
  transition: transform 0.18s var(--ease);
}

.page-about .about-cta__card:hover .about-cta__arrow {
  transform: translateX(4px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

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

@media (min-width: 760px) {
  .page-about .about-era__item {
    grid-template-columns: 108px minmax(0, 1fr);
    align-items: baseline;
    gap: 0 22px;
  }

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

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

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

  .page-about .about-ticket__cell {
    border-bottom: 0;
    border-right: 2px solid var(--line);
  }

  .page-about .about-ticket__cell:last-child {
    border-right: 0;
  }
}

@media (min-width: 860px) {
  .page-about .about-pipeline-media {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: center;
    gap: 32px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 32px;
  }

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

@media (min-width: 900px) {
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 26px;
  }

  .page-about .about-flow__step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 44px;
    right: -26px;
    width: 26px;
    height: 2px;
    background: var(--line);
  }

  .page-about .about-flow__step:not(:last-child)::before {
    content: "";
    position: absolute;
    top: 40px;
    right: -26px;
    width: 9px;
    height: 9px;
    border-top: 2px solid var(--line);
    border-right: 2px solid var(--line);
    transform: rotate(45deg);
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.9fr);
    align-items: start;
    gap: clamp(32px, 4vw, 64px);
  }
}

@media (min-width: 1024px) {
  .page-about .about-spine {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-spine__nav {
    position: sticky;
    top: calc(var(--main-h) + 26px);
  }

  .page-about .about-spine__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-left: 2px solid var(--line);
  }

  .page-about .about-spine__link {
    border: 0;
    border-left: 2px solid transparent;
    margin-left: -2px;
    background: transparent;
    padding: 10px 0 10px 16px;
    white-space: normal;
  }

  .page-about .about-spine__link:hover {
    background: transparent;
    border-left-color: var(--cyan);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-flow__step,
  .page-about .about-spine__link,
  .page-about .about-cta__arrow,
  .page-about .about-flow__sla {
    transition: none;
  }

  .page-about .about-flow__step:hover {
    transform: none;
  }

  .page-about .about-cta__card:hover .about-cta__arrow {
    transform: none;
  }
}