.page-about {
  --about-line: rgba(41, 48, 61, .88);
  --about-tint: rgba(255, 138, 31, .08);
  --about-tint-cyan: rgba(69, 216, 230, .07);
  position: relative;
  overflow-x: hidden;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 3.6vw, 40px) 0 clamp(56px, 8vw, 104px);
  background:
    radial-gradient(120% 92% at 84% 0%, rgba(255, 138, 31, .13), transparent 60%),
    radial-gradient(90% 70% at 6% 100%, rgba(69, 216, 230, .07), transparent 62%),
    linear-gradient(180deg, #0A0B0F 0%, #0D1017 100%);
  border-bottom: 1px solid var(--steel);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(41, 48, 61, .32) 1px, transparent 1px),
    linear-gradient(90deg, rgba(41, 48, 61, .32) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 76%);
  opacity: .5;
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4.4vw, 52px);
  margin-top: clamp(20px, 3vw, 34px);
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: end;
  }
}

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

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(30px, 5.4vw, 56px);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--white);
  text-wrap: balance;
}

.page-about .about-hero__mark {
  color: var(--gold);
  text-shadow: 0 0 22px rgba(255, 196, 107, .28);
}

.page-about .about-hero__lead {
  margin-top: clamp(18px, 2.4vw, 26px);
  max-width: 62ch;
  color: var(--mist);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding: clamp(18px, 2.4vw, 24px) 0 0;
  border-top: 1px solid var(--about-line);
  list-style: none;
}

@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .about-fact__num {
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 700;
  color: var(--amber);
  letter-spacing: -.01em;
}

.page-about .about-fact__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist-dim);
}

.page-about .about-hero__figure {
  margin: 0;
  min-width: 0;
}

@media (min-width: 960px) {
  .page-about .about-hero__figure {
    transform: translateY(14px);
  }
}

.page-about .about-hero__figure .l8-media {
  border: 1px solid var(--steel);
}

.page-about .about-hero__figure .l8-media__caption {
  margin-top: 10px;
}

/* ============ 通用章节头 ============ */
.page-about .about-head {
  margin-bottom: clamp(30px, 4.2vw, 52px);
}

.page-about .about-head__title {
  margin: 12px 0 0;
  color: var(--white);
  text-wrap: balance;
}

.page-about .about-head__lead {
  margin-top: 16px;
  max-width: 68ch;
  color: var(--mist);
}

@media (min-width: 900px) {
  .page-about .about-head--split {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 28px 56px;
    align-items: end;
  }

  .page-about .about-head--split .about-head__lead {
    margin-top: 0;
  }
}

/* ============ 编年区块 ============ */
.page-about .about-arc {
  position: relative;
  background: linear-gradient(180deg, #0A0B0F 0%, #0C0E14 100%);
}

.page-about .about-arc__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
}

@media (min-width: 1000px) {
  .page-about .about-arc__body {
    grid-template-columns: 156px minmax(0, 1fr);
    gap: clamp(28px, 3.4vw, 54px);
  }
}

.page-about .about-arc__rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.page-about .about-arc__rail .l8-filter {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--steel);
  border-radius: 0;
  background: rgba(20, 24, 33, .8);
  color: var(--mist);
  font-family: var(--font-display);
  font-size: 14px;
  line-height: 1.4;
  white-space: nowrap;
  cursor: pointer;
  transition: border-color .22s ease, color .22s ease, background-color .22s ease;
}

.page-about .about-arc__rail .l8-filter:hover {
  border-color: var(--cyan);
  color: var(--white);
}

.page-about .about-arc__rail .l8-filter[aria-pressed="true"],
.page-about .about-arc__rail .l8-filter.is-active {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--ink);
  font-weight: 700;
}

.page-about .about-arc__rail .l8-filter__count {
  font-family: var(--font-mono);
  font-size: 11px;
  opacity: .8;
}

@media (min-width: 1000px) {
  .page-about .about-arc__rail {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
    position: sticky;
    top: 112px;
    align-self: start;
    border-left: 2px solid var(--amber);
    padding-left: 12px;
  }

  .page-about .about-arc__rail .l8-filter {
    width: 100%;
    justify-content: space-between;
  }
}

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

.page-about .about-arc__figure {
  margin: 0 0 clamp(24px, 3.2vw, 36px);
}

.page-about .about-arc__figure .l8-media {
  border: 1px solid var(--steel);
}

.page-about .about-era {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-bottom: clamp(18px, 2.4vw, 26px);
}

@media (min-width: 720px) {
  .page-about .about-era {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 22px;
  }
}

.page-about .about-era__spin {
  display: flex;
  align-items: center;
  gap: 10px;
}

@media (min-width: 720px) {
  .page-about .about-era__spin {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 6px 0 0 14px;
    border-left: 2px solid var(--amber);
  }
}

.page-about .about-era__year {
  font-size: 20px;
  font-weight: 700;
  color: var(--amber);
  letter-spacing: -.01em;
}

.page-about .about-era__badge {
  display: inline-block;
  padding: 2px 8px;
  border: 1px solid var(--about-line);
  font-size: 12px;
  color: var(--cyan);
  letter-spacing: .06em;
}

.page-about .about-era__panel {
  position: relative;
  min-width: 0;
  padding: clamp(20px, 2.6vw, 30px);
  background: linear-gradient(180deg, rgba(20, 24, 33, .96), rgba(10, 11, 15, .96));
  border: 1px solid var(--steel);
}

.page-about .about-era__panel .l8-h3 {
  margin: 10px 0 0;
  color: var(--white);
}

.page-about .about-era__panel p {
  margin: 12px 0 0;
  color: var(--mist);
}

.page-about .about-era__list {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

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

.page-about .about-era__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 8px;
  height: 1px;
  background: var(--amber);
}

/* ============ 团队区块 ============ */
.page-about .about-crew-section {
  background:
    linear-gradient(180deg, rgba(20, 24, 33, .55) 0%, rgba(10, 11, 15, 0) 60%),
    #0A0B0F;
}

.page-about .about-crew-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 44px);
}

@media (min-width: 980px) {
  .page-about .about-crew-grid {
    grid-template-columns: minmax(0, .86fr) minmax(0, 1.14fr);
    align-items: start;
  }
}

.page-about .about-crew-figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-crew-figure .l8-media {
  border: 1px solid var(--steel);
}

.page-about .about-crew-figure .l8-media__caption {
  margin-top: 10px;
}

.page-about .about-crew-list {
  min-width: 0;
}

.page-about .about-crew {
  position: relative;
  border: 1px solid var(--steel);
  background: linear-gradient(180deg, rgba(20, 24, 33, .92), rgba(10, 11, 15, .92));
  transition: border-color .24s ease, background-color .24s ease;
}

.page-about .about-crew + .about-crew {
  margin-top: 10px;
}

.page-about .about-crew:hover {
  border-color: rgba(69, 216, 230, .5);
}

.page-about .about-crew[open] {
  border-color: rgba(255, 138, 31, .5);
  background: linear-gradient(180deg, rgba(42, 26, 12, .55), rgba(10, 11, 15, .94));
}

.page-about .about-crew > summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-crew__idx {
  font-size: 13px;
  font-weight: 700;
  color: var(--amber);
  letter-spacing: .04em;
}

.page-about .about-crew__name {
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 800;
  color: var(--white);
  letter-spacing: -.01em;
}

.page-about .about-crew__arrow {
  margin-left: auto;
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  transform: rotate(45deg);
  transition: transform .26s ease;
}

.page-about .about-crew[open] .about-crew__arrow {
  transform: rotate(-135deg);
}

.page-about .about-crew__body {
  padding: 0 18px 18px;
}

.page-about .about-crew__body p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-crew__for {
  padding-left: 14px;
  border-left: 2px solid var(--steel);
  color: var(--mist-dim) !important;
  font-size: 14px !important;
}

/* ============ 同步流程 ============ */
.page-about .about-flow {
  background: #0A0B0F;
}

.page-about .about-flow__steps {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

@media (min-width: 860px) {
  .page-about .about-flow__steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }
}

.page-about .about-step {
  position: relative;
  min-width: 0;
  padding: clamp(20px, 2.6vw, 28px);
  border: 1px solid var(--steel);
  background: linear-gradient(180deg, rgba(20, 24, 33, .9), rgba(10, 11, 15, .9));
}

@media (min-width: 860px) {
  .page-about .about-flow__steps .about-step + .about-step {
    border-left: none;
  }
}

.page-about .about-step__num {
  display: block;
  font-size: 26px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: .02em;
}

.page-about .about-step .l8-h3 {
  margin: 10px 0 0;
  color: var(--white);
}

.page-about .about-step p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-flow__note {
  margin-top: clamp(18px, 2.4vw, 26px);
  padding-left: 16px;
  border-left: 2px solid var(--amber);
  color: var(--mist);
}

/* ============ 服务版图 ============ */
.page-about .about-lines-section {
  background: linear-gradient(180deg, #0A0B0F 0%, #0C0F16 100%);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-lines {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

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

@media (min-width: 1120px) {
  .page-about .about-lines {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-line {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: clamp(20px, 2.4vw, 26px);
  border: 1px solid var(--steel);
  background: linear-gradient(180deg, rgba(20, 24, 33, .92), rgba(10, 11, 15, .94));
  color: inherit;
  text-decoration: none;
  transition: border-color .24s ease, transform .24s ease, background-color .24s ease;
}

.page-about .about-line::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 22px;
  height: 22px;
  background: linear-gradient(135deg, transparent 50%, var(--steel) 50%);
  transition: background .24s ease;
}

.page-about .about-line:hover,
.page-about .about-line:focus-visible {
  border-color: var(--amber);
  transform: translateY(-3px);
}

.page-about .about-line:hover::after,
.page-about .about-line:focus-visible::after {
  background: linear-gradient(135deg, transparent 50%, var(--amber) 50%);
}

.page-about .about-line__idx {
  font-size: 12px;
  color: var(--mist-dim);
  letter-spacing: .08em;
}

.page-about .about-line .l8-h3 {
  margin: 10px 0 0;
  color: var(--white);
}

.page-about .about-line__who {
  margin: 8px 0 0;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-about .about-line p:not(.about-line__who) {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-line__go {
  margin-top: auto;
  padding-top: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--amber);
  letter-spacing: .02em;
}

/* ============ 运营做法 ============ */
.page-about .about-rules {
  background: #0A0B0F;
}

.page-about .about-rules__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

@media (min-width: 700px) {
  .page-about .about-rules__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-rule {
  position: relative;
  min-width: 0;
  padding: clamp(20px, 2.6vw, 28px);
  border: 1px solid var(--steel);
  background:
    linear-gradient(135deg, var(--about-tint) 0%, transparent 42%),
    linear-gradient(180deg, rgba(20, 24, 33, .9), rgba(10, 11, 15, .94));
}

.page-about .about-rule__key {
  display: inline-block;
  padding: 3px 10px;
  border: 1px solid var(--amber);
  font-size: 12px;
  color: var(--amber);
  letter-spacing: .1em;
}

.page-about .about-rule .l8-h3 {
  margin: 14px 0 0;
  color: var(--white);
}

.page-about .about-rule p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

/* ============ 底部行动区 ============ */
.page-about .about-cta {
  margin-top: clamp(32px, 4.6vw, 56px);
  padding: clamp(24px, 3.4vw, 40px);
  border: 1px solid var(--steel);
  background:
    radial-gradient(120% 140% at 88% 0%, var(--about-tint-cyan), transparent 60%),
    linear-gradient(180deg, rgba(20, 24, 33, .96), rgba(10, 11, 15, .96));
  display: grid;
  gap: 20px;
}

@media (min-width: 860px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
  }
}

.page-about .about-cta__text {
  margin: 0;
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.6;
  font-weight: 700;
  color: var(--white);
}

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

.page-about .about-cta__actions .l8-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-line,
  .page-about .about-crew__arrow,
  .page-about .about-crew,
  .page-about .about-arc__rail .l8-filter {
    transition: none;
  }

  .page-about .about-line:hover,
  .page-about .about-line:focus-visible {
    transform: none;
  }
}