.page-about {
  background-color: var(--ink-900);
  color: var(--cream-100);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .container {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ---------- 报头 ---------- */
.page-about .about-masthead {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: 124px 0 60px;
  background-color: var(--ink-900);
}

.page-about .about-masthead__bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 32%;
  opacity: 0.42;
}

.page-about .about-masthead__veil {
  position: absolute;
  inset: 0;
  z-index: -1;
  display: block;
  background:
    radial-gradient(120% 80% at 82% 6%, rgba(122, 75, 208, 0.42), rgba(122, 75, 208, 0) 62%),
    linear-gradient(180deg, rgba(11, 10, 15, 0.62) 0%, rgba(11, 10, 15, 0.94) 58%, var(--ink-900) 100%);
}

.page-about .about-masthead__inner .breadcrumbs {
  margin: 0 0 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--violet-muted);
}

.page-about .about-masthead__inner .breadcrumbs li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--line-400);
}

.page-about .about-masthead__inner .breadcrumbs a {
  color: var(--gold-300);
  text-decoration: none;
}

.page-about .about-masthead__inner .breadcrumbs a:hover {
  color: var(--gold-500);
}

.page-about .about-masthead h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 8vw, 4.4rem);
  line-height: 1.1;
  letter-spacing: 0.05em;
  max-width: 20em;
  color: var(--cream-100);
  text-shadow: 0 2px 24px rgba(11, 10, 15, 0.7);
}

.page-about .about-masthead__lede {
  margin: 22px 0 0;
  max-width: 54ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: rgba(243, 235, 218, 0.8);
}

.page-about .about-masthead__meta {
  margin: 34px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line-400);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--violet-muted);
}

.page-about .about-meta__item {
  position: relative;
  padding-left: 14px;
}

.page-about .about-meta__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  margin-top: -3px;
  border-radius: 50%;
  background: var(--gold-500);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: 62px 0;
  position: relative;
}

.page-about .about-section--raised {
  background-color: var(--ink-700);
}

.page-about .about-section--purple {
  background: linear-gradient(180deg, var(--ink-700) 0%, #191231 55%, var(--ink-900) 100%);
}

.page-about .about-section--purple::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.55;
  background-image: radial-gradient(rgba(243, 235, 218, 0.06) 1px, transparent 1px);
  background-size: 5px 5px;
}

.page-about .about-section--purple > .container {
  position: relative;
  z-index: 1;
}

.page-about .about-section__head {
  max-width: 62ch;
}

.page-about .about-section__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.7rem, 5vw, 2.75rem);
  line-height: 1.2;
  letter-spacing: 0.04em;
  color: var(--cream-100);
}

.page-about .about-section__note {
  margin: 16px 0 0;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(243, 235, 218, 0.72);
}

.page-about .about-lede {
  margin: 0;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: rgba(243, 235, 218, 0.82);
}

/* ---------- 四类内容 ---------- */
.page-about .genre-list {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background-color: var(--line-400);
  border-top: 1px solid var(--line-400);
  border-bottom: 1px solid var(--line-400);
}

.page-about .genre {
  background-color: var(--ink-900);
  padding: 22px 18px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .genre__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.page-about .genre__idx {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--line-400);
}

.page-about .genre__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  line-height: 1.4;
  color: var(--gold-300);
  letter-spacing: 0.03em;
}

.page-about .genre__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(243, 235, 218, 0.74);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  --tl-pad: 34px;
  position: relative;
  list-style: none;
  margin: 36px 0 0;
  padding: 0 0 0 var(--tl-pad);
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold-500) 0%, rgba(201, 162, 39, 0.5) 55%, rgba(201, 162, 39, 0.12) 100%);
}

.page-about .timeline__item {
  position: relative;
  margin-bottom: 18px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--tl-pad) + 1px);
  top: 24px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--ink-700);
  border: 2px solid var(--gold-500);
  box-shadow: 0 0 0 4px rgba(201, 162, 39, 0.1);
}

.page-about .stage {
  background-color: var(--panel-600);
  border: 1px solid var(--line-400);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .stage__summary {
  position: relative;
  cursor: pointer;
  list-style: none;
  padding: 18px 46px 18px 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  transition: background-color 0.2s var(--ease-out);
}

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

.page-about .stage__summary::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--gold-500), var(--purple-500));
  transition: width 0.32s var(--ease-out);
}

.page-about .stage__summary:hover::before,
.page-about .stage[open] .stage__summary::before {
  width: 100%;
}

.page-about .stage__summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 17px;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--gold-500);
  transition: color 0.2s var(--ease-out);
}

.page-about .stage[open] .stage__summary::after {
  content: "\2212";
  color: var(--purple-500);
}

.page-about .stage__summary:hover {
  background-color: rgba(122, 75, 208, 0.08);
}

.page-about .stage__period {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gold-500);
}

.page-about .stage__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.0625rem;
  line-height: 1.5;
  color: var(--cream-100);
  letter-spacing: 0.02em;
}

.page-about .stage__body {
  padding: 4px 20px 22px;
}

.page-about .stage__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(243, 235, 218, 0.78);
}

.page-about .stage__points {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .stage__points li {
  position: relative;
  padding-left: 18px;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--violet-muted);
}

.page-about .stage__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 1px;
  background-color: var(--gold-500);
}

/* ---------- 内容生产 ---------- */
.page-about .craft {
  margin-top: 32px;
  display: grid;
  gap: 30px;
}

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

.page-about .team-list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .team {
  border-left: 2px solid var(--line-400);
  padding-left: 16px;
  transition: border-color 0.24s var(--ease-out);
}

.page-about .team:hover {
  border-left-color: var(--gold-500);
}

.page-about .team__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: 0.03em;
  color: var(--cream-100);
}

.page-about .team__desc {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(243, 235, 218, 0.72);
}

.page-about .step-row {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px 14px;
}

.page-about .step {
  border-top: 2px solid var(--purple-500);
  padding-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .step__num {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--gold-500);
}

.page-about .step__label {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: 0.06em;
  color: var(--cream-100);
}

/* ---------- 合作 ---------- */
.page-about .partners {
  margin-top: 32px;
  display: grid;
  gap: 30px;
}

.page-about .partner-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .partner {
  background-color: var(--panel-600);
  border-radius: var(--radius-md);
  padding: 16px 18px;
}

.page-about .partner__label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--emerald-500);
}

.page-about .partner__desc {
  margin: 8px 0 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(243, 235, 218, 0.74);
}

.page-about .partners__link {
  margin: 22px 0 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--violet-muted);
}

.page-about .partners__link a {
  color: var(--gold-300);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 162, 39, 0.4);
}

.page-about .partners__link a:hover {
  color: var(--gold-500);
  border-bottom-color: var(--gold-500);
}

.page-about .stat-strip {
  margin-top: 36px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background-color: var(--line-400);
  border-top: 1px solid var(--line-400);
  border-bottom: 1px solid var(--line-400);
}

.page-about .stat {
  background-color: var(--ink-900);
  padding: 22px 18px 24px;
}

.page-about .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.6rem, 5vw, 2.15rem);
  letter-spacing: 0.02em;
  color: var(--gold-300);
}

.page-about .stat__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--violet-muted);
}

/* ---------- 三件事 ---------- */
.page-about .tenets {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 26px;
}

.page-about .tenet {
  border-top: 1px solid var(--line-400);
  padding-top: 20px;
  position: relative;
}

.page-about .tenet::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 46px;
  height: 1px;
  background-color: var(--gold-500);
}

.page-about .tenet__index {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--purple-500);
}

.page-about .tenet__title {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  line-height: 1.45;
  letter-spacing: 0.03em;
  color: var(--cream-100);
}

.page-about .tenet__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(243, 235, 218, 0.74);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding: 56px 0 72px;
  background: linear-gradient(180deg, var(--ink-900) 0%, #150f27 100%);
  border-top: 1px solid var(--line-400);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 26px;
}

.page-about .about-cta__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 4.6vw, 2.2rem);
  line-height: 1.28;
  letter-spacing: 0.04em;
  color: var(--cream-100);
}

.page-about .about-cta__text {
  margin: 14px 0 0;
  max-width: 48ch;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(243, 235, 218, 0.76);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .genre-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .step-row {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .stat-strip {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-masthead {
    padding: 168px 0 96px;
  }

  .page-about .about-section {
    padding: 92px 0;
  }

  .page-about .timeline {
    --tl-pad: 64px;
    margin-top: 48px;
  }

  .page-about .timeline__item:nth-child(odd) {
    width: 74%;
  }

  .page-about .timeline__item:nth-child(even) {
    width: 58%;
    margin-left: auto;
  }

  .page-about .craft {
    grid-template-columns: 5fr 7fr;
    align-items: start;
    gap: 52px;
  }

  .page-about .partners {
    grid-template-columns: 7fr 5fr;
    align-items: start;
    gap: 52px;
  }

  .page-about .tenets {
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: 7fr 5fr;
    align-items: center;
    gap: 48px;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1180px) {
  .page-about .genre {
    padding: 30px 28px 32px;
  }

  .page-about .stat {
    padding: 28px 26px 30px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stage__summary::before,
  .page-about .stage__summary::after,
  .page-about .team {
    transition: none;
  }
}