.page-about {
  --tl-x: 7px;
  --tl-pad: 40px;
  position: relative;
  overflow-x: clip;
}

@media (min-width: 900px) {
  .page-about {
    --tl-x: 31px;
    --tl-pad: 72px;
  }
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(16px, 2.6vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4.5vw, 56px) 0 clamp(32px, 5.5vw, 72px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -35% -20% -12%;
  background:
    radial-gradient(46% 42% at 14% 24%, rgba(124, 60, 255, 0.26), transparent 68%),
    radial-gradient(42% 36% at 88% 8%, rgba(35, 211, 238, 0.16), transparent 70%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--grad-brand);
  opacity: 0.45;
}

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

.page-about .about-eyebrow {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-cyan);
  margin: 0 0 18px;
}

.page-about .about-hero h1 {
  font-family: var(--f-display);
  font-size: clamp(38px, 8vw, 88px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  font-weight: 700;
  color: var(--c-text);
  margin: 0 0 clamp(24px, 4vw, 40px);
  max-width: 20em;
}

.page-about .about-hero h1 .hl {
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-hero-lower {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

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

.page-about .about-lead {
  margin: 0;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.8;
  color: var(--c-muted);
  max-width: 34em;
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}

@media (min-width: 760px) {
  .page-about .about-figures {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-figures > div {
  background: var(--c-panel);
  padding: 14px 16px 16px;
}

.page-about .about-figures dt {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--c-muted);
  margin-bottom: 8px;
}

.page-about .about-figures dd {
  margin: 0;
  font-family: var(--f-display);
  font-size: 24px;
  letter-spacing: -0.01em;
  color: var(--c-text);
}

.page-about .about-figures dd .num {
  font-family: var(--f-mono);
  font-size: 26px;
  color: var(--c-lime);
  font-variant-numeric: tabular-nums;
}

/* ---------- 纵向时间轴 ---------- */
.page-about .about-flow {
  position: relative;
  display: grid;
  gap: clamp(48px, 7vw, 92px);
  padding: clamp(36px, 5.5vw, 72px) 0 clamp(48px, 7vw, 96px);
}

.page-about .about-flow::before {
  content: "";
  position: absolute;
  left: var(--tl-x);
  top: clamp(40px, 6vw, 80px);
  bottom: clamp(40px, 6vw, 80px);
  width: 1px;
  background: linear-gradient(
    180deg,
    transparent,
    rgba(124, 60, 255, 0.55) 5%,
    rgba(35, 211, 238, 0.5) 55%,
    rgba(166, 255, 60, 0.35) 88%,
    transparent
  );
}

.page-about .about-chapter {
  position: relative;
  padding-left: var(--tl-pad);
}

.page-about .about-chapter::before {
  content: "";
  position: absolute;
  left: calc(var(--tl-x) - 4px);
  top: 13px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-bg);
  border: 2px solid var(--c-cyan);
  box-shadow: 0 0 0 4px rgba(35, 211, 238, 0.08);
}

.page-about .about-node {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-muted);
  margin: 0 0 12px;
}

.page-about .about-chapter h2 {
  font-family: var(--f-display);
  font-size: clamp(26px, 4.6vw, 40px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--c-text);
  margin: 0 0 18px;
  max-width: 17em;
}

.page-about .about-chapter > p,
.page-about .about-split p {
  color: var(--c-muted);
  font-size: 16px;
  line-height: 1.8;
  margin: 0 0 16px;
  max-width: 36em;
}

.page-about .about-link {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(35, 211, 238, 0.35);
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--c-lime);
  border-color: rgba(166, 255, 60, 0.6);
}

/* ---------- 非对称分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

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

  .page-about .about-split--flip {
    grid-template-columns: 5fr 7fr;
  }
}

.page-about .about-figure {
  margin: 0;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--c-line);
  background: var(--c-panel);
}

.page-about .about-figure::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 2px;
  background: var(--grad-brand);
  opacity: 0.7;
}

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

.page-about .about-figure--team {
  aspect-ratio: 14 / 9;
}

.page-about .about-figure--stage {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--season {
  aspect-ratio: 2 / 1;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-figure figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 10px 14px;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--c-muted);
  background: linear-gradient(180deg, transparent, rgba(10, 12, 20, 0.9));
}

/* ---------- 角色分工 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--c-line);
}

.page-about .about-roles li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 10px 16px 0;
  border-bottom: 1px solid var(--c-line);
  transition: background 0.2s ease, padding-left 0.2s ease;
}

.page-about .about-roles li:hover,
.page-about .about-roles li:focus-within {
  background: rgba(35, 211, 238, 0.05);
  padding-left: 10px;
}

.page-about .role-idx {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-lime);
  padding-top: 4px;
}

.page-about .role-body h3 {
  font-family: var(--f-body);
  font-size: 17px;
  font-weight: 700;
  color: var(--c-text);
  margin: 0 0 6px;
}

.page-about .role-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--c-muted);
}

/* ---------- 三阶段 ---------- */
.page-about .about-stages {
  display: grid;
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
  margin: 10px 0 20px;
}

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

.page-about .about-stage {
  background: var(--c-panel);
  padding: 20px 18px 22px;
}

.page-about .stage-tag {
  display: inline-block;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-purple);
  border: 1px solid rgba(124, 60, 255, 0.45);
  padding: 2px 8px;
  margin-bottom: 14px;
}

.page-about .about-stage h3 {
  font-family: var(--f-body);
  font-size: 18px;
  font-weight: 700;
  color: var(--c-text);
  margin: 0 0 10px;
}

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

.page-about .about-note {
  margin: 0 !important;
  font-size: 15px !important;
}

/* ---------- 来源 ---------- */
.page-about .about-sources {
  list-style: none;
  margin: 22px 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

@media (min-width: 820px) {
  .page-about .about-sources {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

.page-about .about-sources li {
  border-left: 2px solid var(--c-cyan);
  padding: 4px 4px 4px 16px;
  background: linear-gradient(90deg, rgba(35, 211, 238, 0.05), transparent 70%);
}

.page-about .about-sources strong {
  display: block;
  font-family: var(--f-body);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 8px;
}

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

.page-about .about-quote {
  margin: 24px 0 0;
  padding: 18px 20px;
  border: 1px solid rgba(35, 211, 238, 0.38);
  border-left-width: 2px;
  background: rgba(35, 211, 238, 0.04);
}

.page-about .about-quote p {
  margin: 0 0 10px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-text);
  max-width: 38em;
}

.page-about .about-quote cite {
  font-family: var(--f-mono);
  font-style: normal;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-muted);
}

/* ---------- S1–S5 步骤条 ---------- */
.page-about .about-steps {
  list-style: none;
  display: flex;
  gap: 8px;
  margin: 8px 0 24px;
  padding: 0 0 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

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

.page-about .about-steps a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--c-line);
  background: var(--c-panel);
  color: var(--c-text);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.18s ease, background 0.18s ease;
}

.page-about .about-steps a .mono {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--c-lime);
}

.page-about .about-steps a:hover,
.page-about .about-steps a:focus-visible {
  border-color: var(--c-cyan);
  background: rgba(35, 211, 238, 0.08);
}

.page-about .about-seasons {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--c-line);
}

.page-about .about-seasons li {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--c-line);
  scroll-margin-top: 96px;
}

.page-about .about-seasons li:hover {
  background: rgba(124, 60, 255, 0.05);
}

.page-about .season-idx {
  font-family: var(--f-mono);
  font-size: 18px;
  letter-spacing: 0.04em;
  color: var(--c-lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-seasons p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-muted);
  max-width: 42em;
}

/* ---------- 合作方向 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

@media (min-width: 760px) {
  .page-about .about-partners {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 1100px) {
  .page-about .about-partners {
    grid-template-columns: 1fr;
  }
}

.page-about .about-partners li {
  border: 1px solid var(--c-line);
  background: var(--c-panel);
  padding: 16px 18px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-partners li:hover {
  border-color: rgba(35, 211, 238, 0.5);
  transform: translateX(3px);
}

.page-about .about-partners h3 {
  font-family: var(--f-body);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-text);
  margin: 0 0 8px;
}

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

.page-about .about-cta-line {
  margin: 26px 0 0 !important;
  font-size: 16px !important;
  color: var(--c-text) !important;
  border-left: 2px solid var(--c-purple);
  padding-left: 16px;
  max-width: 42em !important;
}

/* ---------- 窄屏收敛 ---------- */
@media (max-width: 600px) {
  .page-about .about-chapter h2 {
    font-size: 26px;
  }

  .page-about .about-hero h1 {
    font-size: clamp(30px, 9vw, 46px);
  }

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

  .page-about .about-figures dd {
    font-size: 20px;
  }

  .page-about .about-figures dd .num {
    font-size: 22px;
  }

  .page-about .about-steps {
    padding-bottom: 12px;
  }

  .page-about .about-seasons li {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 12px;
  }
}
<<<END>>>