.page-about {
  --about-rail: 92px;
  --about-glow: rgba(47, 243, 214, 0.14);
  --about-warm: rgba(255, 122, 47, 0.12);
}

/* 首屏框景 */
.page-about .about-hero {
  padding-block: clamp(20px, 4vw, 40px) clamp(36px, 6vw, 72px);
}

.page-about .about-hero__frame {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: clamp(20px, 3.4vw, 44px);
  overflow: hidden;
  background:
    radial-gradient(120% 90% at 84% -12%, var(--about-glow), transparent 58%),
    radial-gradient(90% 80% at 0% 112%, rgba(42, 27, 77, 0.72), transparent 62%),
    rgba(10, 20, 36, 0.55);
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan) 20%, var(--orange) 64%, transparent);
  opacity: 0.9;
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  inset: 12px;
  pointer-events: none;
  background-image:
    linear-gradient(var(--cyan), var(--cyan)),
    linear-gradient(var(--cyan), var(--cyan)),
    linear-gradient(var(--cyan), var(--cyan)),
    linear-gradient(var(--cyan), var(--cyan));
  background-repeat: no-repeat;
  background-size: 26px 1px, 1px 26px, 26px 1px, 1px 26px;
  background-position: left top, left top, right bottom, right bottom;
  opacity: 0.5;
}

.page-about .about-hero__crumb {
  position: relative;
  z-index: 1;
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .about-hero__crumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .about-hero__crumb a {
  color: var(--muted);
  text-decoration: none;
}

.page-about .about-hero__crumb a:hover,
.page-about .about-hero__crumb a:focus-visible {
  color: var(--cyan);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 6vw, 3.5rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-hero__title span {
  color: var(--cyan);
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 40em;
  color: var(--text);
  font-size: clamp(0.98rem, 1.4vw, 1.08rem);
  line-height: 1.85;
}

.page-about .about-hero__facts {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 18px;
  margin: 26px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-hero__facts .mono {
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  letter-spacing: 0.04em;
  color: var(--white);
  line-height: 1.2;
}

.page-about .about-hero__facts em {
  font-style: normal;
  font-size: 0.8rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

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

.page-about .about-hero__media {
  margin: 0;
  width: 100%;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(14, 59, 58, 0.85), rgba(42, 27, 77, 0.6));
}

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

/* 章节骨架 */
.page-about .about-chapter {
  position: relative;
  padding-block: clamp(48px, 8vw, 96px);
}

.page-about .about-chapter--jade {
  background:
    radial-gradient(90% 70% at 0% 0%, var(--about-glow), transparent 56%),
    linear-gradient(155deg, var(--jade), rgba(14, 59, 58, 0.55) 58%, var(--ink-900));
}

.page-about .about-chapter--night {
  background:
    radial-gradient(80% 60% at 100% 0%, rgba(47, 243, 214, 0.07), transparent 60%),
    var(--ink-800);
}

.page-about .about-chapter--indigo {
  background:
    radial-gradient(80% 70% at 92% 8%, var(--about-warm), transparent 56%),
    linear-gradient(160deg, var(--indigo), rgba(42, 27, 77, 0.52) 60%, var(--ink-900));
}

.page-about .about-chapter--wine {
  background:
    radial-gradient(90% 70% at 8% 100%, var(--about-warm), transparent 60%),
    linear-gradient(150deg, var(--wine), rgba(62, 21, 38, 0.55) 55%, var(--ink-900));
}

.page-about .about-chapter__inner {
  display: grid;
  gap: clamp(14px, 2.4vw, 26px);
}

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

.page-about .about-chapter__rail::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--line), transparent);
}

.page-about .about-chapter__rail .index-num {
  font-size: clamp(1.05rem, 2vw, 1.45rem);
  line-height: 1;
}

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

.page-about .about-chapter__title {
  margin: 12px 0 clamp(18px, 3vw, 28px);
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.4vw, 2.35rem);
  line-height: 1.22;
  letter-spacing: -0.015em;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-chapter__main {
  min-width: 0;
  color: var(--text);
}

.page-about .about-chapter__main p {
  margin: 0 0 1em;
}

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

.page-about .about-split {
  display: grid;
  gap: clamp(20px, 3.4vw, 32px);
}

.page-about .about-split--tight {
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .about-note {
  align-self: start;
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  border-radius: var(--radius-md);
  background: rgba(18, 32, 58, 0.72);
  padding: clamp(16px, 2.6vw, 24px);
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.8;
}

.page-about .about-note p {
  margin: 0;
}

.page-about .about-note__key {
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  color: var(--cyan);
  font-size: 0.78rem;
  margin-bottom: 10px !important;
}

/* 时间线 */
.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(22px, 3.2vw, 34px);
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 30px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(47, 243, 214, 0.32) 42%, rgba(255, 122, 47, 0.55));
  opacity: 0.6;
}

.page-about .timeline::after {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  bottom: 30px;
  width: 11px;
  background: repeating-linear-gradient(to bottom, rgba(143, 161, 191, 0.5) 0 1px, transparent 1px 9px);
  opacity: 0.5;
}

.page-about .timeline__item {
  position: relative;
  padding-left: 34px;
  min-width: 0;
}

.page-about .timeline__marker {
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 12px rgba(47, 243, 214, 0.55);
  transition: transform 0.3s var(--ease), background-color 0.3s var(--ease);
}

.page-about .timeline__item:hover .timeline__marker,
.page-about .timeline__item:focus-within .timeline__marker {
  background: var(--cyan);
  transform: scale(1.2);
}

.page-about .timeline__body {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(18, 32, 58, 0.78), rgba(10, 20, 36, 0.58));
  padding: clamp(15px, 2.4vw, 24px);
  transition: border-color 0.35s var(--ease), transform 0.35s var(--ease);
}

.page-about .timeline__item:hover .timeline__body {
  border-color: rgba(47, 243, 214, 0.55);
  transform: translateX(3px);
}

.page-about .timeline__year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  letter-spacing: 0.06em;
  color: var(--orange);
  line-height: 1.2;
}

.page-about .timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .timeline__text {
  margin: 0;
  color: var(--text);
  font-size: 0.95rem;
  line-height: 1.8;
}

.page-about .timeline__more {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
}

.page-about .timeline__more summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.05em;
  color: var(--muted);
  outline: none;
}

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

.page-about .timeline__more summary::before {
  content: "+ ";
  color: var(--cyan);
}

.page-about .timeline__more[open] summary::before {
  content: "− ";
}

.page-about .timeline__more summary:hover,
.page-about .timeline__more summary:focus-visible {
  color: var(--cyan);
}

.page-about .timeline__more p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.8;
}

/* 流程 */
.page-about .about-flow-media {
  margin: 0 0 clamp(22px, 3.4vw, 34px);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(120deg, rgba(42, 27, 77, 0.8), rgba(14, 59, 58, 0.5));
}

.page-about .about-flow-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .flow__step {
  position: relative;
  min-width: 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: rgba(10, 20, 36, 0.6);
  padding: clamp(15px, 2.2vw, 20px);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .flow__step:hover {
  border-color: rgba(47, 243, 214, 0.55);
  transform: translateY(-4px);
}

.page-about .flow__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--orange);
  margin-bottom: 10px;
}

.page-about .flow__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .flow__text {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--muted);
}

/* 团队 */
.page-about .about-team {
  position: relative;
  isolation: isolate;
}

.page-about .about-team__bg {
  position: absolute;
  inset: -6% -4%;
  z-index: 0;
  opacity: 0.22;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(70% 70% at 50% 40%, #000 30%, transparent 78%);
  mask-image: radial-gradient(70% 70% at 50% 40%, #000 30%, transparent 78%);
}

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

.page-about .about-team__list {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-team__card {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(18, 32, 58, 0.88), rgba(10, 20, 36, 0.62));
  padding: clamp(16px, 2.4vw, 24px);
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .about-team__card:hover {
  border-color: rgba(255, 122, 47, 0.55);
  box-shadow: var(--shadow-raise);
}

.page-about .about-team__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 3.4vw, 2.2rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--white);
  margin-bottom: 10px;
}

.page-about .about-team__name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.78;
  color: var(--text);
}

.page-about .about-team__meta {
  position: relative;
  z-index: 1;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 0.86rem;
  line-height: 1.8;
  color: var(--muted);
}

/* 指标 */
.page-about .metrics {
  list-style: none;
  margin: 0 0 clamp(22px, 3.4vw, 34px);
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .metrics__item {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(18, 32, 58, 0.86), rgba(10, 20, 36, 0.52));
  padding: clamp(18px, 2.6vw, 26px);
}

.page-about .metrics__item::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  opacity: 0.7;
}

.page-about .metrics__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 4.2vw, 2.8rem);
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .metrics__unit {
  font-size: 0.42em;
  color: var(--cyan);
  margin-left: 5px;
  letter-spacing: 0.04em;
}

.page-about .metrics__label {
  margin: 12px 0 0;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--muted);
}

/* 接下来的方向 */
.page-about .about-next {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-next__item {
  min-width: 0;
  border: 1px solid rgba(47, 243, 214, 0.22);
  border-radius: var(--radius-md);
  padding: clamp(16px, 2.6vw, 24px);
  background: rgba(5, 7, 13, 0.5);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-next__item:hover {
  border-color: rgba(47, 243, 214, 0.6);
  transform: translateY(-4px);
}

.page-about .about-next__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--ink-900);
  background: var(--cyan);
  border-radius: var(--pill);
  padding: 3px 10px;
  margin-bottom: 12px;
}

.page-about .about-next__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-next__item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--text);
}

/* 收尾通道 */
.page-about .about-cta {
  padding-block: clamp(44px, 7vw, 84px);
  background:
    radial-gradient(80% 70% at 88% 0%, rgba(255, 122, 47, 0.12), transparent 58%),
    radial-gradient(70% 60% at 0% 100%, var(--about-glow), transparent 60%),
    var(--ink-800);
  border-top: 1px solid var(--line);
}

.page-about .about-cta__inner {
  display: grid;
  gap: clamp(22px, 3.4vw, 36px);
}

.page-about .about-cta__title {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 3.2vw, 2.1rem);
  line-height: 1.24;
  letter-spacing: -0.015em;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-cta__text {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.8;
}

.page-about .about-cta__links {
  display: grid;
  gap: 12px;
}

.page-about .about-cta__link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
  padding: clamp(16px, 2.4vw, 22px);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(18, 32, 58, 0.6);
  text-decoration: none;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease), background-color 0.3s var(--ease);
}

.page-about .about-cta__link:hover,
.page-about .about-cta__link:focus-visible {
  border-color: var(--cyan);
  transform: translateY(-4px);
  background: rgba(18, 32, 58, 0.9);
}

.page-about .about-cta__link-title {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-cta__link-desc {
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--muted);
}

/* 响应式 */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 0.68fr);
    align-items: end;
  }

  .page-about .about-chapter__inner {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: clamp(20px, 3vw, 40px);
  }

  .page-about .about-chapter__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    position: sticky;
    top: 140px;
    align-self: start;
  }

  .page-about .about-chapter__rail::after {
    width: 1px;
    flex: 0 0 64px;
    height: 64px;
    background: linear-gradient(180deg, var(--line), transparent);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .timeline__item {
    padding-left: 42px;
  }

  .page-about .metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(16px, 2.4vw, 24px);
  }

  .page-about .about-next {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(16px, 2.4vw, 24px);
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: center;
  }

  .page-about .about-cta__links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .flow__step {
    border-radius: var(--radius-md);
    margin-right: 14px;
    padding-inline: 16px;
  }

  .page-about .flow__step:last-child {
    margin-right: 0;
  }

  .page-about .flow__step::after {
    content: "";
    position: absolute;
    right: -14px;
    top: 26px;
    width: 14px;
    height: 1px;
    background: linear-gradient(90deg, var(--cyan), transparent);
    opacity: 0.8;
  }

  .page-about .flow__step:last-child::after {
    display: none;
  }

  .page-about .about-team__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__marker,
  .page-about .timeline__body,
  .page-about .flow__step,
  .page-about .about-team__card,
  .page-about .about-next__item,
  .page-about .about-cta__link {
    transition: none;
  }

  .page-about .timeline__item:hover .timeline__body,
  .page-about .flow__step:hover,
  .page-about .about-next__item:hover,
  .page-about .about-cta__link:hover,
  .page-about .about-cta__link:focus-visible {
    transform: none;
  }
}