.page-about {
  --about-rail: 96px;
  --about-soft: rgba(138, 92, 255, .18);
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-top: clamp(18px, 3.5vw, 36px);
  padding-bottom: clamp(34px, 6vw, 70px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -8% 35% -8%;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(56% 58% at 76% 18%, rgba(138, 92, 255, .34), transparent 70%),
    radial-gradient(42% 46% at 10% 6%, rgba(45, 226, 198, .14), transparent 72%);
  animation: about-halo 8s ease-in-out infinite;
}

@keyframes about-halo {
  0%, 100% { opacity: .7; }
  50% { opacity: 1; }
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: clamp(16px, 3vw, 30px);
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
  gap: clamp(24px, 4vw, 54px);
  align-items: center;
}

.page-about .about-hero__kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--muted);
}

.page-about .about-hero__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--cyan);
  border: 1px solid var(--line);
  padding: 3px 8px;
}

.page-about .about-hero__title {
  margin: 16px 0 18px;
  font-size: clamp(2.1rem, 5.2vw, 4.2rem);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .about-hero__lede {
  max-width: 32em;
  margin: 0;
  font-size: clamp(1rem, 1.05vw, 1.1rem);
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-2);
  box-shadow: 6px 6px 0 0 var(--about-soft);
}

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

.page-about .about-hero__media .media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 12px 14px 10px;
  font-size: 13px;
  color: var(--paper-warm);
  background: linear-gradient(to top, rgba(7, 6, 15, .94), rgba(7, 6, 15, 0));
}

.page-about .about-hero__badge {
  position: absolute;
  top: 12px;
  right: 12px;
}

/* ---------- 关键数据条 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(30px, 5vw, 56px) 0 0;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-stats__item {
  display: grid;
  gap: 8px;
  padding: 18px 20px 20px;
  background: var(--ink-2);
}

.page-about .about-stats__key {
  margin: 0;
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--muted);
}

.page-about .about-stats__val {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0;
  font-family: var(--font-mono);
  color: var(--cyan);
}

.page-about .about-stats__num {
  font-size: clamp(1.35rem, 2.4vw, 1.9rem);
  font-weight: 700;
  letter-spacing: .01em;
}

.page-about .about-stats__unit {
  font-size: .78rem;
  color: var(--muted);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  gap: clamp(18px, 3vw, 40px);
  padding-top: clamp(40px, 6vw, 76px);
  padding-bottom: clamp(40px, 6vw, 76px);
  border-top: 1px solid var(--line);
}

.page-about .about-chapter__rail {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
  padding-top: 4px;
}

.page-about .about-chapter__no {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--violet);
}

.page-about .about-chapter__rail .anno {
  writing-mode: vertical-rl;
  font-size: 12px;
  letter-spacing: .26em;
  color: var(--muted);
}

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

.page-about .about-chapter__title {
  margin: 0 0 14px;
  font-size: clamp(1.45rem, 2.9vw, 2.35rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .about-chapter__lede {
  max-width: 62ch;
  margin: 0 0 clamp(22px, 3.5vw, 36px);
  font-size: 1rem;
  line-height: 1.78;
  color: var(--muted);
  padding-bottom: clamp(16px, 2.5vw, 24px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(45, 226, 198, .45);
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

/* ---------- 三条主线 ---------- */
.page-about .about-lines {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(14px, 2vw, 22px);
}

.page-about .about-line {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px 22px 24px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-top-width: 2px;
  position: relative;
}

.page-about .about-line--violet { border-top-color: var(--violet); }
.page-about .about-line--cyan { border-top-color: var(--cyan); }
.page-about .about-line--orange { border-top-color: var(--orange); }

.page-about .about-line .tag {
  align-self: flex-start;
}

.page-about .about-line__title {
  margin: 0;
  font-size: 1.08rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .about-line__text {
  margin: 0;
  font-size: .94rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-line__goal {
  margin: auto 0 0;
  padding-top: 12px;
  font-size: .88rem;
  line-height: 1.65;
  color: var(--paper-warm);
  border-top: 1px dashed var(--line);
}

.page-about .about-line--violet .about-line__goal { color: #C9B8FF; }
.page-about .about-line--cyan .about-line__goal { color: #9BEFDF; }
.page-about .about-line--orange .about-line__goal { color: #FFC39B; }

/* ---------- 发展历程时间轴 ---------- */
.page-about .about-tl {
  list-style: none;
  margin: clamp(22px, 3.5vw, 36px) 0 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: clamp(16px, 2.4vw, 26px);
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 42px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, var(--violet), var(--cyan) 55%, var(--orange));
  opacity: .55;
}

.page-about .about-tl__item {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: clamp(14px, 2.4vw, 28px);
  align-items: start;
}

.page-about .about-tl__year {
  position: relative;
  z-index: 1;
  display: block;
  padding: 7px 0;
  text-align: center;
  font-family: var(--font-mono);
  font-size: .85rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--paper);
  background: var(--ink-2);
  border: 1px solid var(--line);
  transition: transform 240ms var(--ease), border-color 240ms var(--ease), color 240ms var(--ease);
}

.page-about .about-tl__item:hover .about-tl__year {
  transform: scale(1.08);
  border-color: var(--violet);
  color: var(--cyan);
}

.page-about .about-tl__body {
  position: relative;
  padding: 16px 20px 18px;
  background: var(--ink-2);
  border: 1px solid var(--line);
}

.page-about .about-tl__body::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 18px;
  width: 2px;
  height: 24px;
  background: var(--violet);
}

.page-about .about-tl__title {
  margin: 0 0 8px;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .about-tl__text {
  margin: 0;
  max-width: 60ch;
  font-size: .94rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-season {
  margin: clamp(26px, 4vw, 42px) 0 0;
  border: 1px solid var(--line);
  background: var(--ink-2);
  padding: 12px;
}

.page-about .about-season img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-season__cap {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: .86rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 内容生产 ---------- */
.page-about .about-process {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  gap: clamp(20px, 3vw, 36px);
  align-items: start;
}

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

.page-about .about-steps__item {
  position: relative;
  padding: 16px 0 18px 62px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-steps__no {
  position: absolute;
  left: 0;
  top: 18px;
  font-family: var(--font-mono);
  font-size: .9rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-about .about-steps__name {
  margin: 0 0 5px;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-steps__text {
  margin: 0;
  max-width: 54ch;
  font-size: .93rem;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-steps__time {
  display: inline-block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .06em;
  color: var(--violet);
}

.page-about .about-process__figure {
  margin: 0;
  padding: 10px;
  background: var(--paper-warm);
  border: 1px solid var(--line);
  box-shadow: 6px 6px 0 0 var(--about-soft);
}

.page-about .about-process__figure img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-process__figure figcaption {
  margin-top: 10px;
  font-size: .83rem;
  line-height: 1.65;
  color: #3A3550;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(14px, 2vw, 20px);
}

.page-about .about-team__role {
  padding: 20px 22px 22px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
}

.page-about .about-team__tag {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .1em;
  color: var(--muted);
  border: 1px solid var(--line);
  padding: 2px 7px;
}

.page-about .about-team__name {
  margin: 0 0 8px;
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-team__text {
  margin: 0;
  font-size: .93rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 会员权益分档 ---------- */
.page-about .about-tiers {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(14px, 2vw, 20px);
}

.page-about .about-tier {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px 22px 24px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-top-width: 2px;
}

.page-about .about-tier--entry { border-top-color: var(--cyan); }
.page-about .about-tier--plus { border-top-color: var(--violet); }
.page-about .about-tier--pro { border-top-color: var(--orange); }

.page-about .about-tier__name {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--paper);
}

.page-about .about-tier__price {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0;
  font-family: var(--font-mono);
}

.page-about .about-tier__num {
  font-size: clamp(2rem, 3.4vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
}

.page-about .about-tier--entry .about-tier__num { color: var(--cyan); }
.page-about .about-tier--plus .about-tier__num { color: var(--violet); }
.page-about .about-tier--pro .about-tier__num { color: var(--orange); }

.page-about .about-tier__unit {
  font-size: .82rem;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .about-tier__desc {
  margin: 0;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-tier__list {
  list-style: none;
  margin: auto 0 0;
  padding: 14px 0 0;
  border-top: 1px dashed var(--line);
  display: grid;
  gap: 8px;
}

.page-about .about-tier__list li {
  position: relative;
  padding-left: 16px;
  font-size: .9rem;
  line-height: 1.6;
  color: var(--paper-warm);
}

.page-about .about-tier__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 7px;
  height: 1px;
  background: var(--muted);
}

.page-about .about-tiers__foot {
  margin: clamp(18px, 2.5vw, 26px) 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: .92rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 合作参考 ---------- */
.page-about .about-partner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
  align-items: start;
}

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

.page-about .about-partner__stat {
  display: grid;
  gap: 8px;
  padding: 18px 20px;
  background: var(--ink-2);
}

.page-about .about-partner__num {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 2.3vw, 1.8rem);
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--orange);
}

.page-about .about-partner__label {
  font-size: .86rem;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-partner__note {
  padding: 22px 22px 24px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-left: 2px solid var(--violet);
}

.page-about .about-partner__sub {
  margin: 0 0 12px;
  font-size: 1.04rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-partner__note p {
  margin: 0 0 12px;
  font-size: .94rem;
  line-height: 1.78;
  color: var(--muted);
}

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

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  margin-top: clamp(40px, 6vw, 72px);
  padding: clamp(34px, 5vw, 60px) 0;
  border-top: 1px solid var(--line);
  background:
    linear-gradient(120deg, rgba(138, 92, 255, .16), transparent 58%),
    var(--ink-2);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  gap: clamp(20px, 3vw, 40px);
  align-items: center;
}

.page-about .about-cta__copy h2 {
  margin: 0 0 12px;
  font-size: clamp(1.4rem, 2.7vw, 2.1rem);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-cta__copy p {
  margin: 0;
  max-width: 52ch;
  font-size: .96rem;
  line-height: 1.78;
  color: var(--muted);
}

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

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1fr);
    gap: clamp(22px, 4vw, 34px);
  }

  .page-about .about-hero__media {
    box-shadow: 4px 4px 0 0 var(--about-soft);
  }

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

  .page-about .about-process__figure {
    order: -1;
  }

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

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

@media (max-width: 860px) {
  .page-about .about-tiers {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-tier--pro {
    grid-column: 1 / -1;
  }
}

@media (max-width: 760px) {
  .page-about .about-chapter {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }

  .page-about .about-chapter__rail {
    flex-direction: row;
    align-items: center;
    gap: 12px;
  }

  .page-about .about-chapter__rail .anno {
    writing-mode: horizontal-tb;
    letter-spacing: .2em;
  }

  .page-about .about-lines,
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr);
  }

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

@media (max-width: 620px) {
  .page-about .about-tiers {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-tier--pro {
    grid-column: auto;
  }

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

  .page-about .about-cta__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .page-about .about-cta__actions .btn {
    text-align: center;
  }
}

@media (max-width: 560px) {
  .page-about .about-tl::before {
    display: none;
  }

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

  .page-about .about-tl__year {
    justify-self: start;
    padding: 6px 14px;
  }

  .page-about .about-steps__item {
    padding-left: 44px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero::before {
    animation: none;
    opacity: .85;
  }

  .page-about .about-tl__year {
    transition: none;
  }

  .page-about .about-tl__item:hover .about-tl__year {
    transform: none;
  }
}