.page-about {
  --about-rail: 92px;
  --flow-pad: clamp(22px, 3vw, 34px);
  position: relative;
  overflow-x: clip;
  background:
    radial-gradient(980px 540px at 94% -6%, rgba(57, 255, 136, .10), transparent 62%),
    radial-gradient(760px 520px at -8% 36%, rgba(255, 122, 26, .085), transparent 64%);
  padding-bottom: clamp(48px, 8vw, 96px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 4vw, 44px) 0 clamp(26px, 4.5vw, 48px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: clamp(90px, 18vw, 200px);
  height: 2px;
  background: linear-gradient(90deg, var(--volt), var(--arc));
  border-radius: 2px;
}

.page-about .about-hero h1 {
  margin: 0.6rem 0 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  font-size: clamp(1.9rem, 4.8vw, 3.3rem);
  line-height: 1.14;
  color: var(--ice);
}

.page-about .about-hero__lede {
  max-width: 64ch;
  margin: 1.1rem 0 0;
  font-size: clamp(1rem, 1.3vw, 1.1rem);
  line-height: 1.9;
  color: var(--steel);
}

.page-about .about-figures {
  list-style: none;
  margin: clamp(22px, 3.6vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-figure {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
  padding: clamp(14px, 2vw, 22px) clamp(14px, 2.2vw, 24px);
  background: var(--panel-blue);
}

.page-about .about-figure__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 2.8vw, 2.1rem);
  font-weight: 700;
  line-height: 1;
  color: var(--volt);
}

.page-about .about-figure:nth-child(2) .about-figure__num {
  color: var(--arc);
}

.page-about .about-figure__lab {
  font-size: 0.84rem;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--steel);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-chapter {
  padding: clamp(34px, 6vw, 76px) 0 0;
}

.page-about .about-chapter--panel {
  margin-top: clamp(34px, 6vw, 72px);
  padding: clamp(26px, 4vw, 48px) 0 clamp(30px, 4.5vw, 56px);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(15, 41, 66, 0.85), rgba(10, 27, 46, 0) 92%);
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 22px);
}

.page-about .about-chapter__rail .section-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 2.6vw, 1.95rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1;
  color: var(--arc);
}

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

.page-about .about-chapter h2 {
  margin: 0 0 0.8rem;
  max-width: 26ch;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.015em;
  font-size: clamp(1.35rem, 2.6vw, 2rem);
  line-height: 1.28;
  color: var(--ice);
}

.page-about .about-chapter__lede {
  margin: 0 0 1rem;
  max-width: 54ch;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.02rem, 1.5vw, 1.16rem);
  line-height: 1.85;
  color: var(--ice);
}

.page-about .about-chapter p {
  margin: 0 0 0.9rem;
  max-width: 68ch;
  line-height: 1.85;
  color: var(--steel);
}

.page-about .about-chapter h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1.02rem;
  line-height: 1.5;
  color: var(--ice);
}

.page-about .about-chapter__foot {
  margin-top: clamp(16px, 2.4vw, 24px);
  font-size: 0.95rem;
}

.page-about .about-chapter__foot a {
  color: var(--volt);
  text-decoration: none;
  border-bottom: 1px solid rgba(57, 255, 136, 0.45);
}

.page-about .about-chapter__foot a:hover,
.page-about .about-chapter__foot a:focus-visible {
  border-bottom-color: var(--volt);
}

/* ---------- 01 图文分栏 ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 30px);
  align-items: start;
  margin-top: clamp(10px, 1.6vw, 16px);
}

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

.page-about .about-split__media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  object-fit: cover;
}

.page-about .about-points {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-points li {
  position: relative;
  padding-left: 20px;
  line-height: 1.75;
  color: var(--steel);
}

.page-about .about-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--volt);
  transform: rotate(45deg);
}

.page-about .about-points strong {
  color: var(--ice);
  font-weight: 600;
}

/* ---------- 02 团队卡片 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(12px, 1.6vw, 18px);
  margin-top: clamp(16px, 2.4vw, 24px);
}

.page-about .about-team__card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  padding: clamp(14px, 2vw, 20px);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: linear-gradient(180deg, rgba(22, 57, 92, 0.55), rgba(15, 41, 66, 0.95));
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-team__card:hover {
  border-color: rgba(57, 255, 136, 0.6);
  transform: translateY(-3px);
}

.page-about .about-team__card p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.75;
}

/* ---------- 03 流程 ---------- */

.page-about .about-flow {
  position: relative;
  list-style: none;
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  padding: 0 0 0 var(--flow-pad);
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
}

.page-about .about-flow::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0.8em;
  bottom: 0.8em;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--volt), var(--arc), rgba(29, 78, 117, 0.25));
}

.page-about .about-flow__item {
  position: relative;
  min-width: 0;
}

.page-about .about-flow__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--flow-pad) + 5px);
  top: 0.5em;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--deck-navy);
  border: 2px solid var(--volt);
  box-shadow: 0 0 0 3px rgba(57, 255, 136, 0.12);
  transform: translateX(-50%);
}

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

/* ---------- 04 版本时间线 ---------- */

.page-about .about-timeline-wrap {
  margin-top: clamp(16px, 2.4vw, 24px);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 14px;
  display: flex;
  gap: clamp(12px, 1.6vw, 18px);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  scrollbar-color: var(--glass-blue) transparent;
}

.page-about .about-timeline:focus-visible {
  outline: 2px solid var(--volt);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

.page-about .about-timeline__item {
  flex: 0 0 min(272px, 76vw);
  min-width: 0;
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(14px, 2vw, 20px);
  border: 1px solid var(--line);
  border-top: 2px solid var(--arc);
  border-radius: var(--radius-sm);
  background: var(--panel-blue);
  transition: border-top-color 0.3s var(--ease), transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .about-timeline__item:hover,
.page-about .about-timeline__item:focus-within {
  border-top-color: var(--volt);
  transform: translateY(-4px);
  box-shadow: var(--shadow-deep);
}

.page-about .about-timeline__item.is-current {
  border-top-color: var(--volt);
  background: linear-gradient(180deg, rgba(57, 255, 136, 0.09), var(--panel-blue) 70%);
}

.page-about .about-timeline__ver {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--arc);
}

.page-about .about-timeline__item.is-current .about-timeline__ver {
  color: var(--volt);
}

.page-about .about-timeline__item h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.08rem;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .about-timeline__item p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--steel);
}

.page-about .about-timeline__hint {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.page-about .about-timeline-media {
  margin: clamp(18px, 2.8vw, 30px) 0 0;
}

.page-about .about-timeline-media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  object-fit: cover;
}

/* ---------- 05 合作 ---------- */

.page-about .about-partner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(12px, 1.8vw, 20px);
  margin-top: clamp(14px, 2vw, 20px);
}

.page-about .about-partner__item {
  min-width: 0;
  padding: clamp(14px, 2vw, 20px) clamp(16px, 2.2vw, 22px);
  border-left: 3px solid var(--arc);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: rgba(15, 41, 66, 0.75);
}

.page-about .about-partner__item p {
  margin: 0;
  font-size: 0.94rem;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 2.6vw, 26px);
}

.page-about .about-collab-media {
  margin: clamp(22px, 3.4vw, 36px) 0 0;
}

.page-about .about-collab-media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  object-fit: cover;
}

/* ---------- 06 联系 ---------- */

.page-about .about-contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 20px);
  margin-top: clamp(16px, 2.4vw, 24px);
}

.page-about .about-contact-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  min-width: 0;
  padding: clamp(18px, 2.6vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(22, 57, 92, 0.5), var(--panel-blue));
}

.page-about .about-contact-card h3 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.12rem;
  letter-spacing: -0.01em;
}

.page-about .about-contact-card p {
  margin: 0 0 4px;
}

/* ---------- 响应式 ---------- */

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

@media (min-width: 760px) {
  .page-about .about-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 780px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-chapter__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-chapter__rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }
}

@media (min-width: 1080px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.85fr);
    gap: clamp(24px, 3.4vw, 44px);
  }
}

@media (min-width: 1180px) {
  .page-about .about-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__card,
  .page-about .about-timeline__item {
    transition: none;
  }

  .page-about .about-team__card:hover,
  .page-about .about-timeline__item:hover,
  .page-about .about-timeline__item:focus-within {
    transform: none;
  }
}