/* ================= 品牌历程页 ================= */
.page-about {
  --about-rail: clamp(78px, 11vw, 138px);
  --about-tl-gap: clamp(18px, 3vw, 40px);
  --about-band: clamp(56px, 8.5vw, 104px);
  --about-ink-grad: linear-gradient(152deg, rgba(18, 58, 50, 0.55), rgba(5, 14, 24, 0.9) 74%);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 4vw, 40px) 0 clamp(52px, 8vw, 96px);
  background-color: var(--c-ink);
  background-image:
    radial-gradient(72% 62% at 94% 6%, rgba(53, 224, 192, 0.13), transparent 64%),
    radial-gradient(58% 52% at 0% 100%, rgba(232, 180, 74, 0.10), transparent 62%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-gold), transparent);
}

.page-about .breadcrumb {
  margin-bottom: clamp(22px, 3.6vw, 38px);
}

.page-about .about-hero-grid {
  align-items: center;
  gap: clamp(28px, 4.5vw, 56px);
}

.page-about .about-hero-copy .eyebrow {
  margin: 0 0 14px;
}

.page-about .about-hero-copy .display-title {
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  max-width: 16ch;
}

.page-about .about-hero-copy .lede {
  margin: 0;
  max-width: 58ch;
}

.page-about .about-hero-side {
  padding: clamp(22px, 3vw, 34px);
  background: var(--about-ink-grad);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
}

.page-about .hero-mark {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .hero-mark-note {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--c-pale);
  opacity: 0.82;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  background-color: var(--c-ink);
  padding: var(--about-band) 0 calc(var(--about-band) * 0.75);
}

.page-about .about-timeline .section-head {
  max-width: 68ch;
}

.page-about .timeline {
  list-style: none;
  margin: clamp(36px, 5vw, 60px) 0 0;
  padding: 0;
}

.page-about .timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  gap: var(--about-tl-gap);
  padding-bottom: clamp(30px, 4.6vw, 56px);
}

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

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  top: 30px;
  bottom: 0;
  left: calc(var(--about-rail) + var(--about-tl-gap) / 2);
  width: 1px;
  transform: skewX(-3deg);
  transform-origin: top center;
  background: linear-gradient(180deg, var(--line-gold), rgba(232, 180, 74, 0.06) 86%, transparent);
}

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

.page-about .timeline-year {
  position: sticky;
  top: calc(var(--header-h) + 16px);
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .timeline-year-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 3.4vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: var(--track-mono);
  font-variant-numeric: tabular-nums;
  color: var(--c-gold);
  padding: 10px 0;
  border-top: 1px solid var(--line-gold);
  border-bottom: 1px solid var(--line-gold);
}

.page-about .timeline-year-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--c-pale);
  opacity: 0.78;
}

.page-about .timeline-details {
  margin: 0;
  background: var(--about-ink-grad);
  clip-path: polygon(0 0, calc(100% - var(--notch)) 0, 100% var(--notch), 100% 100%, 0 100%);
  transition: background 0.24s ease, transform 0.24s ease;
}

.page-about .timeline-details:hover {
  transform: translateY(-2px);
  background: linear-gradient(152deg, rgba(18, 58, 50, 0.72), rgba(5, 14, 24, 0.94) 74%);
}

.page-about .timeline-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  padding: clamp(18px, 2.6vw, 26px) clamp(18px, 2.8vw, 30px);
  cursor: pointer;
  list-style: none;
}

.page-about .timeline-summary::-webkit-details-marker {
  display: none;
}

.page-about .timeline-summary::after {
  content: "";
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  margin-left: auto;
  border-right: 1.5px solid var(--c-neon);
  border-bottom: 1.5px solid var(--c-neon);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
}

.page-about .timeline-details[open] .timeline-summary::after {
  transform: rotate(225deg);
}

.page-about .timeline-stage {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--c-coral);
  border: 1px solid rgba(255, 107, 74, 0.46);
  padding: 3px 9px;
  clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 6px, 100% 100%, 0 100%);
}

.page-about .timeline-heading {
  font-size: var(--fs-4);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.45;
  color: var(--c-cream);
}

.page-about .timeline-body {
  padding: 0 clamp(18px, 2.8vw, 30px) clamp(20px, 2.8vw, 30px);
}

.page-about .timeline-body p {
  margin: 0;
  max-width: 64ch;
  font-size: var(--fs-5);
  line-height: var(--lh-body);
  color: var(--c-pale);
}

.page-about .timeline-media {
  margin-top: clamp(18px, 2.4vw, 26px);
}

.page-about .timeline-facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(16px, 2.2vw, 22px) 0 0;
  padding: 0;
}

.page-about .timeline-facts li {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: var(--track-mono);
  font-variant-numeric: tabular-nums;
  color: var(--c-pale);
  border: 1px solid var(--line-mid);
  padding: 6px 12px;
  clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 6px, 100% 100%, 0 100%);
}

/* ---------- 全宽数据带 ---------- */
.page-about .about-band {
  padding: clamp(36px, 5vw, 58px) 0;
  background-color: var(--c-velvet);
  background-image: linear-gradient(96deg, rgba(11, 27, 43, 0.72), transparent 46%, rgba(11, 27, 43, 0.6));
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .band-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: clamp(22px, 3vw, 42px);
}

.page-about .band-cell {
  padding-top: 16px;
  border-top: 1px solid var(--line-gold);
}

.page-about .band-num {
  display: block;
  font-size: clamp(1.9rem, 3.8vw, 2.6rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: var(--track-mono);
  color: var(--c-gold);
  font-variant-numeric: tabular-nums;
}

.page-about .band-label {
  display: block;
  margin-top: 10px;
  max-width: 26ch;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--c-pale);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: var(--about-band) 0;
  background-color: var(--c-cream);
  color: var(--c-brown);
}

.page-about .about-team .section-head {
  max-width: 66ch;
}

.page-about .about-team .section-title--paper {
  color: var(--c-brown);
}

.page-about .about-team .lede {
  color: rgba(42, 31, 24, 0.76);
}

.page-about .about-team .eyebrow {
  color: rgba(42, 31, 24, 0.62);
}

.page-about .about-team .media-frame {
  border: 1px solid rgba(42, 31, 24, 0.16);
}

.page-about .about-media-wide {
  margin: clamp(28px, 4vw, 44px) 0 clamp(30px, 4.4vw, 52px);
}

.page-about .team-flow {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .team-flow li {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: clamp(14px, 2vw, 26px);
  align-items: start;
  padding: clamp(18px, 2.4vw, 26px) 0;
  border-bottom: 1px solid rgba(42, 31, 24, 0.14);
}

.page-about .team-flow li:first-child {
  border-top: 1px solid rgba(42, 31, 24, 0.14);
}

.page-about .flow-num {
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: var(--track-mono);
  color: var(--c-coral);
  padding-top: 3px;
}

.page-about .flow-body h3 {
  margin: 0 0 6px;
  font-size: var(--fs-4);
  letter-spacing: 0.02em;
  color: var(--c-brown);
}

.page-about .flow-body p {
  margin: 0;
  max-width: 58ch;
  font-size: var(--fs-5);
  line-height: var(--lh-body);
  color: rgba(42, 31, 24, 0.78);
}

/* ---------- 字段演进 ---------- */
.page-about .about-fields {
  padding: var(--about-band) 0;
  background-color: var(--c-ink);
}

.page-about .about-fields .section-head {
  max-width: 66ch;
}

.page-about .field-grid {
  margin-top: clamp(30px, 4vw, 48px);
  gap: clamp(22px, 3vw, 40px);
}

.page-about .field-col {
  padding: clamp(20px, 2.6vw, 28px);
  background: rgba(5, 14, 24, 0.55);
  border: 1px solid var(--line-soft);
  clip-path: polygon(0 0, calc(100% - var(--notch)) 0, 100% var(--notch), 100% 100%, 0 100%);
}

.page-about .field-col--now {
  border-color: rgba(53, 224, 192, 0.28);
  background: linear-gradient(158deg, rgba(18, 58, 50, 0.42), rgba(5, 14, 24, 0.7) 70%);
}

.page-about .field-col-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--c-pale);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-gold);
}

.page-about .field-col-title--neon {
  color: var(--c-neon);
}

.page-about .field-list {
  list-style: none;
  display: grid;
  gap: 10px;
  margin: clamp(18px, 2.4vw, 24px) 0 0;
  padding: 0;
}

.page-about .field-list li {
  display: grid;
  gap: 4px;
  padding: 10px 14px;
  border: 1px solid var(--line-soft);
  background: rgba(11, 27, 43, 0.42);
  clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 6px, 100% 100%, 0 100%);
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.page-about .field-name {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: var(--track-mono);
  color: var(--c-pale);
}

.page-about .field-note {
  font-family: var(--font-body);
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--c-gray);
}

.page-about .field-list li.is-new {
  border-color: rgba(53, 224, 192, 0.44);
  background: rgba(53, 224, 192, 0.07);
}

.page-about .field-list li.is-new .field-name {
  color: var(--c-neon);
}

.page-about .field-list li.is-new:hover,
.page-about .field-list li.is-new:focus-within {
  transform: translateY(-2px);
  border-color: var(--c-neon);
  background: rgba(53, 224, 192, 0.15);
}

.page-about .field-list li.is-new:hover .field-note,
.page-about .field-list li.is-new:focus-within .field-note {
  color: var(--c-cream);
}

/* ---------- 归档节奏 ---------- */
.page-about .about-cycles {
  padding: var(--about-band) 0;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-cycles .section-head {
  max-width: 66ch;
}

.page-about .cycle-list {
  list-style: none;
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 0;
}

.page-about .cycle-row {
  display: grid;
  grid-template-columns: clamp(72px, 10vw, 118px) minmax(0, 1fr) auto;
  gap: clamp(16px, 2.4vw, 34px);
  align-items: baseline;
  padding: clamp(20px, 2.8vw, 30px) 0;
  border-bottom: 1px solid var(--line-soft);
  transition: background 0.2s ease;
}

.page-about .cycle-row:first-child {
  border-top: 1px solid var(--line-soft);
}

.page-about .cycle-row:hover {
  background: rgba(53, 224, 192, 0.05);
}

.page-about .cycle-index {
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--c-gold);
}

.page-about .cycle-body h3 {
  margin: 0 0 6px;
  font-size: var(--fs-4);
  letter-spacing: 0.02em;
  color: var(--c-cream);
}

.page-about .cycle-body p {
  margin: 0;
  max-width: 62ch;
  font-size: var(--fs-5);
  line-height: var(--lh-body);
  color: var(--c-pale);
}

.page-about .cycle-data {
  font-size: 0.875rem;
  letter-spacing: var(--track-mono);
  font-variant-numeric: tabular-nums;
  color: var(--c-gold);
  white-space: nowrap;
}

/* ---------- 合作网络 ---------- */
.page-about .about-partners {
  padding: var(--about-band) 0;
  background-color: var(--c-ink);
}

.page-about .partner-grid {
  align-items: start;
  gap: clamp(30px, 4.4vw, 58px);
}

.page-about .partner-copy .section-title {
  margin: 12px 0 clamp(16px, 2.2vw, 24px);
  max-width: 20ch;
}

.page-about .partner-copy p {
  margin: 0 0 16px;
  max-width: 58ch;
  font-size: var(--fs-5);
  line-height: var(--lh-body);
  color: var(--c-pale);
}

.page-about .partner-points {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .partner-points li {
  position: relative;
  padding-left: 22px;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--c-pale);
}

.page-about .partner-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 12px;
  height: 1px;
  background: var(--c-gold);
}

.page-about .partner-side {
  position: relative;
}

.page-about .partner-art {
  height: clamp(96px, 16vw, 150px);
  margin-bottom: -1px;
  background-image: radial-gradient(circle, rgba(232, 180, 74, 0.45) 1.5px, transparent 1.6px);
  background-size: 22px 22px;
  background-position: 0 0;
  opacity: 0.7;
  mask-image: linear-gradient(180deg, transparent, #000 40%, #000 100%);
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 40%, #000 100%);
}

.page-about .partner-side .media-frame {
  border: 1px solid var(--line-soft);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding: var(--about-band) 0 calc(var(--about-band) * 0.9);
  background-color: var(--c-deep);
  background-image: radial-gradient(60% 60% at 88% 4%, rgba(53, 224, 192, 0.09), transparent 62%);
}

.page-about .about-next .section-head {
  max-width: 60ch;
}

.page-about .next-list {
  list-style: none;
  margin: clamp(32px, 4.4vw, 52px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: clamp(20px, 2.8vw, 32px);
}

.page-about .next-item {
  padding: clamp(20px, 2.6vw, 28px);
  background: rgba(11, 27, 43, 0.6);
  border-top: 1px solid var(--line-gold);
  clip-path: polygon(0 0, calc(100% - var(--notch)) 0, 100% var(--notch), 100% 100%, 0 100%);
  transition: transform 0.22s ease, background 0.22s ease;
}

.page-about .next-item:hover {
  transform: translateY(-2px);
  background: rgba(18, 58, 50, 0.55);
}

.page-about .next-num {
  display: block;
  font-size: 0.8125rem;
  letter-spacing: 0.18em;
  color: var(--c-coral);
  margin-bottom: 12px;
}

.page-about .next-item h3 {
  margin: 0 0 10px;
  font-size: var(--fs-4);
  letter-spacing: 0.02em;
  color: var(--c-cream);
}

.page-about .next-item p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--c-pale);
}

.page-about .next-cta {
  margin-top: clamp(36px, 5vw, 56px);
  padding-top: clamp(24px, 3vw, 34px);
  border-top: 1px solid var(--line-soft);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: clamp(18px, 3vw, 34px);
}

.page-about .next-cta p {
  margin: 0;
  max-width: 56ch;
  font-size: var(--fs-5);
  line-height: var(--lh-body);
  color: var(--c-pale);
}

.page-about .next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 行内链接 ---------- */
.page-about .inline-link {
  color: var(--c-neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 192, 0.42);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  color: var(--c-gold);
  border-bottom-color: var(--c-gold);
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .page-about .about-hero-copy,
  .page-about .about-hero-side,
  .page-about .field-col,
  .page-about .partner-copy,
  .page-about .partner-side {
    grid-column: 1 / -1;
  }

  .page-about .timeline-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
    padding-left: 22px;
  }

  .page-about .timeline-item::before {
    left: 0;
    top: 34px;
  }

  .page-about .timeline-year {
    position: static;
    flex-direction: row;
    align-items: baseline;
    gap: 12px;
  }

  .page-about .timeline-year-num {
    font-size: 1.6rem;
    padding: 6px 0;
  }

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

  .page-about .cycle-data {
    order: -1;
  }

  .page-about .about-hero-copy .display-title {
    max-width: none;
  }

  .page-about .partner-copy .section-title {
    max-width: none;
  }
}

@media (max-width: 600px) {
  .page-about .timeline-heading {
    font-size: var(--fs-5);
  }

  .page-about .timeline-summary {
    gap: 8px 12px;
  }

  .page-about .team-flow li {
    grid-template-columns: 40px minmax(0, 1fr);
  }

  .page-about .next-cta {
    flex-direction: column;
    align-items: flex-start;
  }

  .page-about .next-actions {
    width: 100%;
  }

  .page-about .next-actions .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}
</main>

/* ================= 品牌历程页 ================= */
.page-about {
  --about-rail: clamp(78px, 11vw, 138px);
  --about-tl-gap: clamp(18px, 3vw, 40px);
  --about-band: clamp(56px, 8.5vw, 104px);
  --about-ink-grad: linear-gradient(152deg, rgba(18, 58, 50, 0.55), rgba(5, 14, 24, 0.9) 74%);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 4vw, 40px) 0 clamp(52px, 8vw, 96px);
  background-color: var(--c-ink);
  background-image:
    radial-gradient(72% 62% at 94% 6%, rgba(53, 224, 192, 0.13), transparent 64%),
    radial-gradient(58% 52% at 0% 100%, rgba(232, 180, 74, 0.10), transparent 62%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-gold), transparent);
}

.page-about .breadcrumb {
  margin-bottom: clamp(22px, 3.6vw, 38px);
}

.page-about .about-hero-grid {
  align-items: center;
  gap: clamp(28px, 4.5vw, 56px);
}

.page-about .about-hero-copy .eyebrow {
  margin: 0 0 14px;
}

.page-about .about-hero-copy .display-title {
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  max-width: 16ch;
}

.page-about .about-hero-copy .lede {
  margin: 0;
  max-width: 58ch;
}

.page-about .about-hero-side {
  padding: clamp(22px, 3vw, 34px);
  background: var(--about-ink-grad);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
}

.page-about .hero-mark {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .hero-mark-note {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--c-pale);
  opacity: 0.82;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  background-color: var(--c-ink);
  padding: var(--about-band) 0 calc(var(--about-band) * 0.75);
}

.page-about .about-timeline .section-head {
  max-width: 68ch;
}

.page-about .timeline {
  list-style: none;
  margin: clamp(36px, 5vw, 60px) 0 0;
  padding: 0;
}

.page-about .timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  gap: var(--about-tl-gap);
  padding-bottom: clamp(30px, 4.6vw, 56px);
}

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

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  top: 30px;
  bottom: 0;
  left: calc(var(--about-rail) + var(--about-tl-gap) / 2);
  width: 1px;
  transform: skewX(-3deg);
  transform-origin: top center;
  background: linear-gradient(180deg, var(--line-gold), rgba(232, 180, 74, 0.06) 86%, transparent);
}

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

.page-about .timeline-year {
  position: sticky;
  top: calc(var(--header-h) + 16px);
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .timeline-year-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 3.4vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: var(--track-mono);
  font-variant-numeric: tabular-nums;
  color: var(--c-gold);
  padding: 10px 0;
  border-top: 1px solid var(--line-gold);
  border-bottom: 1px solid var(--line-gold);
}

.page-about .timeline-year-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--c-pale);
  opacity: 0.78;
}

.page-about .timeline-details {
  margin: 0;
  background: var(--about-ink-grad);
  clip-path: polygon(0 0, calc(100% - var(--notch)) 0, 100% var(--notch), 100% 100%, 0 100%);
  transition: background 0.24s ease, transform 0.24s ease;
}

.page-about .timeline-details:hover {
  transform: translateY(-2px);
  background: linear-gradient(152deg, rgba(18, 58, 50, 0.72), rgba(5, 14, 24, 0.94) 74%);
}

.page-about .timeline-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  padding: clamp(18px, 2.6vw, 26px) clamp(18px, 2.8vw, 30px);
  cursor: pointer;
  list-style: none;
}

.page-about .timeline-summary::-webkit-details-marker {
  display: none;
}

.page-about .timeline-summary::after {
  content: "";
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  margin-left: auto;
  border-right: 1.5px solid var(--c-neon);
  border-bottom: 1.5px solid var(--c-neon);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
}

.page-about .timeline-details[open] .timeline-summary::after {
  transform: rotate(225deg);
}

.page-about .timeline-stage {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--c-coral);
  border: 1px solid rgba(255, 107, 74, 0.46);
  padding: 3px 9px;
  clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 6px, 100% 100%, 0 100%);
}

.page-about .timeline-heading {
  font-size: var(--fs-4);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.45;
  color: var(--c-cream);
}

.page-about .timeline-body {
  padding: 0 clamp(18px, 2.8vw, 30px) clamp(20px, 2.8vw, 30px);
}

.page-about .timeline-body p {
  margin: 0;
  max-width: 64ch;
  font-size: var(--fs-5);
  line-height: var(--lh-body);
  color: var(--c-pale);
}

.page-about .timeline-media {
  margin-top: clamp(18px, 2.4vw, 26px);
}

.page-about .timeline-facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(16px, 2.2vw, 22px) 0 0;
  padding: 0;
}

.page-about .timeline-facts li {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: var(--track-mono);
  font-variant-numeric: tabular-nums;
  color: var(--c-pale);
  border: 1px solid var(--line-mid);
  padding: 6px 12px;
  clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 6px, 100% 100%, 0 100%);
}

/* ---------- 全宽数据带 ---------- */
.page-about .about-band {
  padding: clamp(36px, 5vw, 58px) 0;
  background-color: var(--c-velvet);
  background-image: linear-gradient(96deg, rgba(11, 27, 43, 0.72), transparent 46%, rgba(11, 27, 43, 0.6));
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .band-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: clamp(22px, 3vw, 42px);
}

.page-about .band-cell {
  padding-top: 16px;
  border-top: 1px solid var(--line-gold);
}

.page-about .band-num {
  display: block;
  font-size: clamp(1.9rem, 3.8vw, 2.6rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: var(--track-mono);
  color: var(--c-gold);
  font-variant-numeric: tabular-nums;
}

.page-about .band-label {
  display: block;
  margin-top: 10px;
  max-width: 26ch;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--c-pale);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: var(--about-band) 0;
  background-color: var(--c-cream);
  color: var(--c-brown);
}

.page-about .about-team .section-head {
  max-width: 66ch;
}

.page-about .about-team .section-title--paper {
  color: var(--c-brown);
}

.page-about .about-team .lede {
  color: rgba(42, 31, 24, 0.76);
}

.page-about .about-team .eyebrow {
  color: rgba(42, 31, 24, 0.62);
}

.page-about .about-team .media-frame {
  border: 1px solid rgba(42, 31, 24, 0.16);
}

.page-about .about-media-wide {
  margin: clamp(28px, 4vw, 44px) 0 clamp(30px, 4.4vw, 52px);
}

.page-about .team-flow {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .team-flow li {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: clamp(14px, 2vw, 26px);
  align-items: start;
  padding: clamp(18px, 2.4vw, 26px) 0;
  border-bottom: 1px solid rgba(42, 31, 24, 0.14);
}

.page-about .team-flow li:first-child {
  border-top: 1px solid rgba(42, 31, 24, 0.14);
}

.page-about .flow-num {
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: var(--track-mono);
  color: var(--c-coral);
  padding-top: 3px;
}

.page-about .flow-body h3 {
  margin: 0 0 6px;
  font-size: var(--fs-4);
  letter-spacing: 0.02em;
  color: var(--c-brown);
}

.page-about .flow-body p {
  margin: 0;
  max-width: 58ch;
  font-size: var(--fs-5);
  line-height: var(--lh-body);
  color: rgba(42, 31, 24, 0.78);
}

/* ---------- 字段演进 ---------- */
.page-about .about-fields {
  padding: var(--about-band) 0;
  background-color: var(--c-ink);
}

.page-about .about-fields .section-head {
  max-width: 66ch;
}

.page-about .field-grid {
  margin-top: clamp(30px, 4vw, 48px);
  gap: clamp(22px, 3vw, 40px);
}

.page-about .field-col {
  padding: clamp(20px, 2.6vw, 28px);
  background: rgba(5, 14, 24, 0.55);
  border: 1px solid var(--line-soft);
  clip-path: polygon(0 0, calc(100% - var(--notch)) 0, 100% var(--notch), 100% 100%, 0 100%);
}

.page-about .field-col--now {
  border-color: rgba(53, 224, 192, 0.28);
  background: linear-gradient(158deg, rgba(18, 58, 50, 0.42), rgba(5, 14, 24, 0.7) 70%);
}

.page-about .field-col-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--c-pale);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-gold);
}

.page-about .field-col-title--neon {
  color: var(--c-neon);
}

.page-about .field-list {
  list-style: none;
  display: grid;
  gap: 10px;
  margin: clamp(18px, 2.4vw, 24px) 0 0;
  padding: 0;
}

.page-about .field-list li {
  display: grid;
  gap: 4px;
  padding: 10px 14px;
  border: 1px solid var(--line-soft);
  background: rgba(11, 27, 43, 0.42);
  clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 6px, 100% 100%, 0 100%);
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.page-about .field-name {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: var(--track-mono);
  color: var(--c-pale);
}

.page-about .field-note {
  font-family: var(--font-body);
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--c-gray);
}

.page-about .field-list li.is-new {
  border-color: rgba(53, 224, 192, 0.44);
  background: rgba(53, 224, 192, 0.07);
}

.page-about .field-list li.is-new .field-name {
  color: var(--c-neon);
}

.page-about .field-list li.is-new:hover,
.page-about .field-list li.is-new:focus-within {
  transform: translateY(-2px);
  border-color: var(--c-neon);
  background: rgba(53, 224, 192, 0.15);
}

.page-about .field-list li.is-new:hover .field-note,
.page-about .field-list li.is-new:focus-within .field-note {
  color: var(--c-cream);
}

/* ---------- 归档节奏 ---------- */
.page-about .about-cycles {
  padding: var(--about-band) 0;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-cycles .section-head {
  max-width: 66ch;
}

.page-about .cycle-list {
  list-style: none;
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 0;
}

.page-about .cycle-row {
  display: grid;
  grid-template-columns: clamp(72px, 10vw, 118px) minmax(0, 1fr) auto;
  gap: clamp(16px, 2.4vw, 34px);
  align-items: baseline;
  padding: clamp(20px, 2.8vw, 30px) 0;
  border-bottom: 1px solid var(--line-soft);
  transition: background 0.2s ease;
}

.page-about .cycle-row:first-child {
  border-top: 1px solid var(--line-soft);
}

.page-about .cycle-row:hover {
  background: rgba(53, 224, 192, 0.05);
}

.page-about .cycle-index {
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--c-gold);
}

.page-about .cycle-body h3 {
  margin: 0 0 6px;
  font-size: var(--fs-4);
  letter-spacing: 0.02em;
  color: var(--c-cream);
}

.page-about .cycle-body p {
  margin: 0;
  max-width: 62ch;
  font-size: var(--fs-5);
  line-height: var(--lh-body);
  color: var(--c-pale);
}

.page-about .cycle-data {
  font-size: 0.875rem;
  letter-spacing: var(--track-mono);
  font-variant-numeric: tabular-nums;
  color: var(--c-gold);
  white-space: nowrap;
}

/* ---------- 合作网络 ---------- */
.page-about .about-partners {
  padding: var(--about-band) 0;
  background-color: var(--c-ink);
}

.page-about .partner-grid {
  align-items: start;
  gap: clamp(30px, 4.4vw, 58px);
}

.page-about .partner-copy .section-title {
  margin: 12px 0 clamp(16px, 2.2vw, 24px);
  max-width: 20ch;
}

.page-about .partner-copy p {
  margin: 0 0 16px;
  max-width: 58ch;
  font-size: var(--fs-5);
  line-height: var(--lh-body);
  color: var(--c-pale);
}

.page-about .partner-points {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .partner-points li {
  position: relative;
  padding-left: 22px;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--c-pale);
}

.page-about .partner-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 12px;
  height: 1px;
  background: var(--c-gold);
}

.page-about .partner-side {
  position: relative;
}

.page-about .partner-art {
  height: clamp(96px, 16vw, 150px);
  margin-bottom: -1px;
  background-image: radial-gradient(circle, rgba(232, 180, 74, 0.45) 1.5px, transparent 1.6px);
  background-size: 22px 22px;
  background-position: 0 0;
  opacity: 0.7;
  mask-image: linear-gradient(180deg, transparent, #000 40%, #000 100%);
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 40%, #000 100%);
}

.page-about .partner-side .media-frame {
  border: 1px solid var(--line-soft);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding: var(--about-band) 0 calc(var(--about-band) * 0.9);
  background-color: var(--c-deep);
  background-image: radial-gradient(60% 60% at 88% 4%, rgba(53, 224, 192, 0.09), transparent 62%);
}

.page-about .about-next .section-head {
  max-width: 60ch;
}

.page-about .next-list {
  list-style: none;
  margin: clamp(32px, 4.4vw, 52px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: clamp(20px, 2.8vw, 32px);
}

.page-about .next-item {
  padding: clamp(20px, 2.6vw, 28px);
  background: rgba(11, 27, 43, 0.6);
  border-top: 1px solid var(--line-gold);
  clip-path: polygon(0 0, calc(100% - var(--notch)) 0, 100% var(--notch), 100% 100%, 0 100%);
  transition: transform 0.22s ease, background 0.22s ease;
}

.page-about .next-item:hover {
  transform: translateY(-2px);
  background: rgba(18, 58, 50, 0.55);
}

.page-about .next-num {
  display: block;
  font-size: 0.8125rem;
  letter-spacing: 0.18em;
  color: var(--c-coral);
  margin-bottom: 12px;
}

.page-about .next-item h3 {
  margin: 0 0 10px;
  font-size: var(--fs-4);
  letter-spacing: 0.02em;
  color: var(--c-cream);
}

.page-about .next-item p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--c-pale);
}

.page-about .next-cta {
  margin-top: clamp(36px, 5vw, 56px);
  padding-top: clamp(24px, 3vw, 34px);
  border-top: 1px solid var(--line-soft);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: clamp(18px, 3vw, 34px);
}

.page-about .next-cta p {
  margin: 0;
  max-width: 56ch;
  font-size: var(--fs-5);
  line-height: var(--lh-body);
  color: var(--c-pale);
}

.page-about .next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 行内链接 ---------- */
.page-about .inline-link {
  color: var(--c-neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 192, 0.42);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  color: var(--c-gold);
  border-bottom-color: var(--c-gold);
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .page-about .about-hero-copy,
  .page-about .about-hero-side,
  .page-about .field-col,
  .page-about .partner-copy,
  .page-about .partner-side {
    grid-column: 1 / -1;
  }

  .page-about .timeline-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
    padding-left: 22px;
  }

  .page-about .timeline-item::before {
    left: 0;
    top: 34px;
  }

  .page-about .timeline-year {
    position: static;
    flex-direction: row;
    align-items: baseline;
    gap: 12px;
  }

  .page-about .timeline-year-num {
    font-size: 1.6rem;
    padding: 6px 0;
  }

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

  .page-about .cycle-data {
    order: -1;
  }

  .page-about .about-hero-copy .display-title {
    max-width: none;
  }

  .page-about .partner-copy .section-title {
    max-width: none;
  }
}

@media (max-width: 600px) {
  .page-about .timeline-heading {
    font-size: var(--fs-5);
  }

  .page-about .timeline-summary {
    gap: 8px 12px;
  }

  .page-about .team-flow li {
    grid-template-columns: 40px minmax(0, 1fr);
  }

  .page-about .next-cta {
    flex-direction: column;
    align-items: flex-start;
  }

  .page-about .next-actions {
    width: 100%;
  }

  .page-about .next-actions .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}