.page-about {
  counter-reset: board;
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
}

.page-about .breadcrumbs {
  padding-top: clamp(1rem, 3vw, 1.75rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.25rem, 4vw, 2.5rem) 0 clamp(2rem, 5vw, 3.25rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -12%;
  width: min(560px, 78vw);
  height: min(560px, 78vw);
  background: radial-gradient(circle at center, rgba(198, 241, 53, 0.14), transparent 68%);
  pointer-events: none;
}

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

.page-about .about-hero h1 {
  margin: 0.6rem 0 0;
  font-size: clamp(2rem, 6.2vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  max-width: 20em;
}

.page-about .about-hero .lede {
  margin-top: 1.25rem;
  max-width: 34em;
  font-size: clamp(1rem, 1.7vw, 1.0625rem);
  line-height: 1.75;
  color: var(--fog);
}

.page-about .about-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.75rem;
  margin: 1.75rem 0 0;
  padding-top: 1.15rem;
  border-top: 1px solid var(--line-soft);
  list-style: none;
  font-size: var(--fs-sm);
  color: var(--fog);
}

.page-about .about-hero-meta li {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}

.page-about .about-hero-meta li::before {
  content: "";
  width: 14px;
  height: 2px;
  background: var(--lime);
  border-radius: 1px;
}

/* ---------- 画板骨架 ---------- */
.page-about .about-board {
  counter-increment: board;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
  margin: 0 0 1.15rem;
  padding: clamp(1.25rem, 3.5vw, 2rem) clamp(1.1rem, 3vw, 1.9rem);
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  box-shadow: var(--shadow-panel);
}

.page-about .about-board::before {
  content: counter(board, decimal-leading-zero);
  grid-column: 1;
  grid-row: 1;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.14em;
  color: var(--lime);
  padding-top: 0.15rem;
}

.page-about .about-board-body {
  grid-column: 1;
  grid-row: 2;
  min-width: 0;
}

.page-about .about-board-body > h2 {
  margin: 0.5rem 0 0;
  font-size: clamp(1.35rem, 3vw, 1.95rem);
  line-height: 1.25;
}

.page-about .about-board-lede {
  margin: 0.85rem 0 0;
  max-width: 38em;
  color: var(--fog);
  line-height: 1.75;
}

.page-about .about-board-body h3 {
  margin: 0 0 0.35rem;
  font-size: var(--fs-h3);
  color: var(--paper);
}

.page-about .about-board-body p {
  line-height: 1.75;
}

.page-about .about-note {
  margin: 1.25rem 0 0;
  padding-top: 0.9rem;
  border-top: 1px dashed var(--line);
  font-size: var(--fs-sm);
  color: var(--fog);
  line-height: 1.75;
}

.page-about .about-board .btn {
  margin-top: 1.15rem;
}

/* ---------- 分栏 ---------- */
.page-about .about-board-split {
  margin-top: 1.25rem;
}

.page-about .about-board-split > * + * {
  margin-top: 1.5rem;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  border-left: 1px dashed var(--line);
  padding-left: 1.15rem;
}

.page-about .about-milestone {
  position: relative;
  padding-bottom: 1.4rem;
}

.page-about .about-milestone:last-child {
  padding-bottom: 0;
}

.page-about .about-milestone::before {
  content: "";
  position: absolute;
  left: calc(-1.15rem - 4px);
  top: 0.42rem;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 3px rgba(198, 241, 53, 0.14);
}

.page-about .about-milestone-key {
  margin: 0 0 0.3rem;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .about-milestone p:last-child {
  margin: 0;
  color: var(--fog);
  font-size: var(--fs-sm);
  line-height: 1.75;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--panel-2);
  box-shadow: var(--shadow-panel);
}

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

.page-about .about-figure--wide {
  margin-top: 1.5rem;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), 0 100%);
}

/* ---------- 四道工序 ---------- */
.page-about .about-flow-wrap {
  margin: 1.4rem 0 1.1rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-flow {
  display: block;
  width: 100%;
  min-width: 560px;
  height: auto;
}

.page-about .about-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-step {
  padding: 1rem 1.1rem;
  background: var(--panel-2);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
}

.page-about .about-step-num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.14em;
  color: var(--electric);
  margin-bottom: 0.4rem;
}

.page-about .about-step p {
  margin: 0;
  font-size: var(--fs-sm);
  color: var(--fog);
  line-height: 1.7;
}

/* ---------- 横向标签带 ---------- */
.page-about .about-band {
  margin: 1.5rem 0;
  padding: 1.05rem clamp(1rem, 4vw, 2rem);
  background: linear-gradient(90deg, var(--panel-2), var(--panel) 55%, var(--panel-2));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-band-track {
  display: flex;
  align-items: center;
  gap: 1.85rem;
  width: max-content;
  min-width: 100%;
}

.page-about .about-sport {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--fs-sm);
  color: var(--paper);
  white-space: nowrap;
}

.page-about .about-sport::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--electric);
}

.page-about .about-sport:nth-child(4n + 1)::before {
  background: var(--lime);
}

.page-about .about-sport:nth-child(4n + 3)::before {
  background: var(--orange);
}

.page-about .about-slot {
  display: inline-flex;
  align-items: baseline;
  gap: 0.55rem;
  font-size: var(--fs-sm);
  color: var(--fog);
  white-space: nowrap;
}

.page-about .about-slot .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.05rem;
  color: var(--lime);
}

/* ---------- 三层标签结构 ---------- */
.page-about .about-layers {
  margin: 1.3rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1rem;
}

.page-about .about-layer {
  padding-left: 0.95rem;
  border-left: 2px solid var(--line);
}

.page-about .about-layer:nth-child(1) {
  border-left-color: var(--lime);
}

.page-about .about-layer:nth-child(2) {
  border-left-color: var(--orange);
}

.page-about .about-layer:nth-child(3) {
  border-left-color: var(--electric);
}

.page-about .about-layer-key {
  display: block;
  font-size: var(--fs-xs);
  color: var(--fog);
  letter-spacing: 0.08em;
  margin-bottom: 0.2rem;
}

.page-about .about-layer strong {
  display: block;
  font-size: var(--fs-h3);
  color: var(--paper);
  font-weight: 600;
}

.page-about .about-layer p {
  margin: 0.35rem 0 0;
  font-size: var(--fs-sm);
  color: var(--fog);
  line-height: 1.7;
}

/* ---------- 团队名册 ---------- */
.page-about .about-roster {
  margin: 1.25rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.85rem;
}

.page-about .about-roster li {
  display: grid;
  grid-template-columns: 3.4rem 1fr;
  gap: 0.25rem 0.9rem;
  padding: 0.85rem 0;
  border-top: 1px solid var(--line-soft);
  align-items: baseline;
}

.page-about .about-roster-num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 2rem;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-roster-label {
  font-size: var(--fs-body);
  color: var(--paper);
  font-weight: 500;
}

.page-about .about-roster-desc {
  font-size: var(--fs-sm);
  color: var(--fog);
  line-height: 1.6;
}

/* ---------- 规模数据 ---------- */
.page-about .about-stats {
  margin-top: 1.35rem;
  display: grid;
  grid-template-columns: 1fr;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel-2);
}

.page-about .about-stat + .about-stat {
  border-top: 1px solid var(--line);
}

.page-about .about-stat summary {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 1.35rem clamp(1rem, 3vw, 1.6rem);
  padding-right: 3rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-stat summary::after {
  content: "+";
  position: absolute;
  top: 1.15rem;
  right: clamp(1rem, 3vw, 1.6rem);
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--fog);
}

.page-about .about-stat[open] summary::after {
  content: "−";
  color: var(--lime);
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2rem, 5.5vw, 3.2rem);
  line-height: 1;
  color: var(--lime);
}

.page-about .about-stat-unit {
  font-family: var(--font-sans);
  font-size: var(--fs-sm);
  color: var(--fog);
  margin-left: 0.3rem;
  letter-spacing: 0;
}

.page-about .about-stat-label {
  font-size: var(--fs-sm);
  color: var(--fog);
}

.page-about .about-stat-detail {
  margin: 0;
  padding: 0.9rem clamp(1rem, 3vw, 1.6rem) 1.3rem;
  border-top: 1px dashed var(--line);
  font-size: var(--fs-sm);
  color: var(--fog);
  line-height: 1.75;
}

/* ---------- 合作 ---------- */
.page-about .about-coop {
  margin: 0.9rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.65rem;
}

.page-about .about-coop li {
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--panel-2);
  font-size: var(--fs-sm);
  color: var(--fog);
  line-height: 1.65;
}

.page-about .about-coop strong {
  color: var(--paper);
  font-weight: 500;
  margin-right: 0.35rem;
}

/* ---------- 收尾 ---------- */
.page-about .about-board--cta {
  border-color: rgba(198, 241, 53, 0.28);
  background: linear-gradient(140deg, var(--panel-2), var(--panel) 70%);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.4rem;
}

.page-about .about-cta-actions .btn {
  margin-top: 0;
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.1rem;
  }

  .page-about .about-layers {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.2rem;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-board {
    grid-template-columns: 56px minmax(0, 1fr);
    column-gap: 1.25rem;
    padding: clamp(1.75rem, 3vw, 2.5rem) clamp(1.5rem, 3vw, 2.5rem);
  }

  .page-about .about-board::before {
    grid-column: 1;
    grid-row: 1;
    font-size: var(--fs-sm);
  }

  .page-about .about-board-body {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-board-split {
    display: grid;
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(1.5rem, 3vw, 2.75rem);
    align-items: start;
  }

  .page-about .about-board-split > * + * {
    margin-top: 0;
  }

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

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

  .page-about .about-stat + .about-stat {
    border-top: 0;
    border-left: 1px solid var(--line);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-board,
  .page-about .about-figure,
  .page-about .about-band-track {
    transition: none;
  }
}
<<<END>>>