.page-about {
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-block: 14px 6px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(16px, 2.6vw, 30px) clamp(34px, 5vw, 62px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    114deg,
    rgba(42, 54, 70, 0.42) 0 1px,
    transparent 1px 72px
  );
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 46px);
  align-items: start;
}

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

.page-about .about-hero__title {
  margin: 12px 0 16px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2rem, 5.6vw, 3.5rem);
  line-height: 1.08;
  letter-spacing: 0.01em;
  color: var(--text);
  transform: skewX(-3deg);
  transform-origin: left center;
  max-width: 20ch;
}

.page-about .about-hero__title .hl {
  color: var(--green);
}

.page-about .about-hero__note {
  margin-top: 14px;
  color: var(--text-2);
  font-size: 0.9375rem;
  max-width: 56ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* 关键数据卡组 */
.page-about .about-hero__deck {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

.page-about .deck-card {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 15px 18px;
  background: linear-gradient(122deg, var(--panel) 0%, var(--panel-2) 100%);
  border: 1px solid var(--line);
  border-left: 3px solid var(--silver);
  clip-path: var(--chamfer-sm);
}

.page-about .deck-card:nth-child(1) { margin-right: 10%; }
.page-about .deck-card:nth-child(2) { margin-left: 10%; }
.page-about .deck-card:nth-child(3) { margin-right: 5%; }

.page-about .deck-card--green { border-left-color: var(--green); }
.page-about .deck-card--orange { border-left-color: var(--orange); }
.page-about .deck-card--blue { border-left-color: var(--blue); }

.page-about .deck-card__no {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.4vw, 2.05rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--silver);
}

.page-about .deck-card--green .deck-card__no { color: var(--green); }
.page-about .deck-card--orange .deck-card__no { color: var(--orange); }
.page-about .deck-card--blue .deck-card__no { color: var(--blue); }

.page-about .deck-card__label {
  color: var(--text-2);
  font-size: 0.875rem;
  line-height: 1.5;
}

/* ---------- 时间轴区块 ---------- */
.page-about .about-track-section {
  padding-block: clamp(34px, 5vw, 66px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-track-head {
  max-width: 60ch;
  margin-bottom: clamp(26px, 4vw, 46px);
}

.page-about .story-track {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: clamp(24px, 3.6vw, 48px);
}

.page-about .story-track::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 19px;
  width: 2px;
  background: linear-gradient(180deg, var(--green) 0%, var(--orange) 48%, var(--line) 100%);
  opacity: 0.6;
}

.page-about .story-node {
  position: relative;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  column-gap: 14px;
  align-items: start;
}

.page-about .story-node__marker {
  grid-column: 1;
  grid-row: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding-top: 6px;
}

.page-about .story-node__dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--green);
  box-shadow: 0 0 0 4px rgba(157, 255, 58, 0.13);
  flex: none;
}

.page-about .story-node--orange .story-node__dot {
  border-color: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 138, 30, 0.15);
}

.page-about .story-node__num {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--text-2);
}

.page-about .story-node__panel {
  grid-column: 2;
  min-width: 0;
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: var(--chamfer-md);
}

.page-about .story-node__year {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--green);
}

.page-about .story-node--orange .story-node__year {
  color: var(--orange);
}

.page-about .story-node__title {
  margin: 8px 0 12px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.25rem, 2.6vw, 1.75rem);
  line-height: 1.22;
  color: var(--text);
}

.page-about .story-node__text {
  color: var(--text-2);
  margin: 0 0 10px;
}

.page-about .story-node__text--tight {
  margin-bottom: 0;
}

/* 数字条 */
.page-about .stat-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 1px;
  margin: 18px 0 20px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .stat-strip__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 12px;
  background: var(--ink);
}

.page-about .stat-strip__num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--green);
}

.page-about .stat-strip__label {
  font-size: 0.8125rem;
  color: var(--text-2);
}

/* 密集索引 */
.page-about .index-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .index-row {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 12px;
  padding: 12px 14px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-left: 2px solid var(--blue);
}

.page-about .index-row__no {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--blue);
  letter-spacing: 0.08em;
  padding-top: 2px;
}

.page-about .index-row__main {
  min-width: 0;
}

.page-about .index-row__title {
  margin: 0 0 3px;
  color: var(--text);
  font-weight: 600;
  font-size: 0.9375rem;
}

.page-about .index-row__desc {
  margin: 0;
  color: var(--text-2);
  font-size: 0.875rem;
  line-height: 1.6;
}

/* 版本对比卡 */
.page-about .pick-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 18px;
}

.page-about .pick-card {
  position: relative;
  padding: 18px;
  background: linear-gradient(150deg, var(--panel-2) 0%, var(--ink) 100%);
  border: 1px solid var(--line);
  border-top: 3px solid var(--silver);
  clip-path: var(--chamfer-sm);
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.page-about .pick-card--green { border-top-color: var(--green); }
.page-about .pick-card--blue { border-top-color: var(--blue); }

.page-about .pick-card:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
}

.page-about .pick-card__tag {
  display: inline-block;
  margin: 0 0 10px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--text);
  background: rgba(195, 203, 214, 0.12);
  border: 1px solid var(--line);
}

.page-about .pick-card--green .pick-card__tag {
  color: var(--green);
  border-color: rgba(157, 255, 58, 0.4);
}

.page-about .pick-card--blue .pick-card__tag {
  color: var(--blue);
  border-color: rgba(63, 169, 255, 0.45);
}

.page-about .pick-card__title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--text);
}

.page-about .pick-card__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .pick-card__list li {
  position: relative;
  padding-left: 16px;
  color: var(--text-2);
  font-size: 0.9rem;
  line-height: 1.65;
}

.page-about .pick-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  background: var(--silver);
  transform: skewX(-18deg);
}

.page-about .pick-card--green .pick-card__list li::before { background: var(--green); }
.page-about .pick-card--blue .pick-card__list li::before { background: var(--blue); }

.page-about .pick-card__more {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  color: var(--silver);
  font-size: 0.8125rem;
  line-height: 1.6;
}

/* 数据表 */
.page-about .data-table {
  width: 100%;
  margin: 18px 0;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.page-about .data-table th,
.page-about .data-table td {
  padding: 11px 12px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.page-about .data-table thead th {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--green);
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.page-about .data-table tbody tr:nth-child(odd) {
  background: rgba(26, 35, 48, 0.55);
}

.page-about .data-table td {
  color: var(--text-2);
}

.page-about .data-table td:first-child {
  color: var(--text);
  white-space: nowrap;
}

/* 团队分工 */
.page-about .team-split {
  list-style: none;
  margin: 16px 0 18px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .team-split__item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 13px 14px;
  background: var(--panel-2);
  border: 1px solid var(--line);
}

.page-about .team-split__num {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .team-split__body {
  min-width: 0;
}

.page-about .team-split__role {
  margin: 0 0 3px;
  color: var(--text);
  font-weight: 600;
  font-size: 0.9375rem;
}

.page-about .team-split__desc {
  margin: 0;
  color: var(--text-2);
  font-size: 0.875rem;
  line-height: 1.6;
}

/* 折叠面板组 */
.page-about .about-miles {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-miles .accordion {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-left: 2px solid var(--orange);
}

.page-about .about-miles .accordion__title {
  cursor: pointer;
  padding: 13px 16px;
  color: var(--text);
  font-size: 0.9375rem;
  font-weight: 600;
}

.page-about .about-miles .accordion__body {
  padding: 0 16px 14px;
  color: var(--text-2);
  font-size: 0.875rem;
  line-height: 1.7;
}

.page-about .about-miles .accordion__body p {
  margin: 0;
}

/* 图片容器 */
.page-about .media-frame {
  display: block;
  margin: 18px 0 0;
  background: var(--panel-2);
  border: 1px solid var(--line);
  clip-path: var(--chamfer-sm);
  overflow: hidden;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .media-frame--wide img {
  aspect-ratio: 16 / 10;
}

.page-about .media-frame__cap {
  display: block;
  margin: 0;
  padding: 10px 14px;
  color: var(--text-2);
  font-size: 0.8125rem;
  line-height: 1.6;
  border-top: 1px solid var(--line);
}

/* ---------- 收尾入口 ---------- */
.page-about .about-next {
  padding-block: clamp(34px, 5vw, 66px) clamp(46px, 6vw, 84px);
  border-top: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(18, 24, 33, 0.6) 0%, transparent 100%);
}

.page-about .about-next .section-head {
  max-width: 56ch;
  margin-bottom: clamp(20px, 3vw, 32px);
}

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

.page-about .about-next__card {
  display: block;
  padding: 20px 18px;
  text-decoration: none;
  color: inherit;
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: var(--chamfer-sm);
  transition: border-color 0.25s ease, background 0.25s ease;
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  border-color: rgba(157, 255, 58, 0.55);
  background: var(--panel-2);
  outline: none;
}

.page-about .about-next__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--green);
  margin-bottom: 10px;
}

.page-about .about-next__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--text);
}

.page-about .about-next__desc {
  margin: 0;
  color: var(--text-2);
  font-size: 0.875rem;
  line-height: 1.65;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 4vw, 60px);
  }

  .page-about .about-hero__deck {
    padding-top: 12px;
  }

  .page-about .story-track::before {
    left: 50%;
    margin-left: -1px;
  }

  .page-about .story-node {
    grid-template-columns: minmax(0, 1fr) 64px minmax(0, 1fr);
    column-gap: 0;
  }

  .page-about .story-node__marker {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .story-node:nth-child(odd) .story-node__panel {
    grid-column: 3;
    grid-row: 1;
    margin-left: 30px;
  }

  .page-about .story-node:nth-child(even) .story-node__panel {
    grid-column: 1;
    grid-row: 1;
    margin-right: 30px;
  }

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

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

@media (min-width: 1100px) {
  .page-about .story-node__panel {
    padding: 26px 30px 30px;
  }
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .pick-card:hover {
    transform: translateY(-4px);
    border-color: rgba(63, 169, 255, 0.45);
  }

  .page-about .pick-card--green:hover {
    border-color: rgba(157, 255, 58, 0.5);
  }

  .page-about .pick-card__more {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
    transition: max-height 0.3s ease, opacity 0.3s ease, margin-top 0.3s ease,
      padding-top 0.3s ease;
  }

  .page-about .pick-card:hover .pick-card__more,
  .page-about .pick-card:focus-within .pick-card__more {
    max-height: 140px;
    opacity: 1;
    margin-top: 14px;
    padding-top: 12px;
    border-top-color: var(--line);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .pick-card,
  .page-about .about-next__card,
  .page-about .pick-card__more {
    transition: none;
    transform: none;
  }
}