.page-about {
  --about-gap: clamp(1rem, 2.6vw, 2rem);
  --about-pad: clamp(2.5rem, 6vw, 4.75rem);
  --about-text: rgba(244, 247, 242, 0.84);
  --about-index-w: 210px;
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.25rem, 3.5vw, 2.25rem) 0 var(--about-pad);
  border-bottom: 2px solid var(--line);
  background:
    radial-gradient(120% 84% at 86% 0%, rgba(43, 245, 196, 0.13), transparent 62%),
    linear-gradient(180deg, var(--carbon) 0%, var(--ink) 76%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--neon), var(--lime) 34%, var(--amber) 68%, transparent);
  opacity: 0.75;
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: clamp(1.1rem, 3vw, 1.9rem);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.4rem, 3.6vw, 2.6rem);
  align-items: start;
}

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

.page-about .about-hero__copy .meta-line {
  margin: 0 0 0.9rem;
  color: var(--mist);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
}

.page-about .about-hero__copy h1 {
  margin: 0 0 1rem;
  font-size: var(--fs-h1);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.18;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 0 0 0.9rem;
  max-width: 48ch;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--about-text);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.4rem;
}

.page-about .about-hero__figure {
  margin: 0;
  min-width: 0;
}

/* ---------- 规模数字条 ---------- */
.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(1.6rem, 4vw, 2.6rem) 0 0;
  padding: 0;
  background: var(--line);
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
}

.page-about .about-figure {
  background: var(--carbon);
  padding: 0.95rem 1rem 1.05rem;
}

.page-about .about-figure__label {
  margin: 0 0 0.3rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .about-figure__num {
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.45rem, 4vw, 2.05rem);
  line-height: 1.1;
  color: var(--neon);
}

.page-about .about-figure:nth-child(2) .about-figure__num { color: var(--paper); }
.page-about .about-figure:nth-child(3) .about-figure__num { color: var(--amber); }
.page-about .about-figure:nth-child(4) .about-figure__num { color: var(--lime); }

.page-about .about-figure__unit {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: var(--about-pad) 0;
  border-bottom: 2px solid var(--line);
  background: var(--ink);
}

.page-about .about-chapter--carbon {
  background: linear-gradient(180deg, var(--carbon) 0%, var(--ink) 100%);
}

.page-about .about-chapter__grid {
  display: grid;
  gap: clamp(1.1rem, 3vw, 2rem);
}

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

.page-about .about-index {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding-left: 0.8rem;
  border-left: 3px solid var(--neon);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--lime);
}

.page-about .about-index__label {
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--mist);
  white-space: nowrap;
}

.page-about .about-chapter__title {
  margin: 0 0 0.9rem;
  font-size: var(--fs-h2);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.24;
  color: var(--paper);
}

.page-about .about-chapter__body > p {
  margin: 0 0 1rem;
  max-width: 68ch;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--about-text);
}

.page-about .about-chapter__body a {
  color: var(--neon);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 图文容器 ---------- */
.page-about .media-frame {
  margin: 1.4rem 0 0;
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

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

.page-about .media-frame--wide .media-frame__media {
  aspect-ratio: 16 / 9;
}

/* ---------- 01 要点列表 ---------- */
.page-about .about-points {
  list-style: none;
  display: grid;
  gap: 0.55rem;
  margin: 1.3rem 0 0;
  padding: 0;
}

.page-about .about-points__item {
  position: relative;
  padding: 0.7rem 0.9rem 0.7rem 2.15rem;
  border: 2px solid var(--line);
  background: var(--carbon);
  font-size: 0.96rem;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .about-points__item::before {
  content: "";
  position: absolute;
  left: 0.85rem;
  top: 1.2rem;
  width: 8px;
  height: 8px;
  background: var(--neon);
  box-shadow: 0 0 0 3px rgba(43, 245, 196, 0.16);
}

/* ---------- 02 筛选与时间线 ---------- */
.page-about .about-path .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.3rem 0 1.6rem;
}

.page-about .about-path .filter-btn {
  border: 2px solid var(--line);
  border-radius: 0;
  background: var(--carbon);
  color: var(--mist);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 0.45rem 0.85rem;
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .about-path .filter-btn:hover {
  color: var(--paper);
  border-color: var(--neon);
}

.page-about .about-path .filter-btn[aria-pressed="true"] {
  background: var(--neon);
  border-color: var(--neon);
  color: var(--ink);
}

.page-about .about-path .filter-empty {
  margin: 1rem 0 0;
  font-size: 0.9rem;
  color: var(--mist);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.7rem;
  border-left: 2px solid var(--line);
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 1.55rem;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -1.7rem;
  margin-left: -7px;
  top: 0.5rem;
  width: 13px;
  height: 13px;
  border: 2px solid var(--neon);
  border-radius: 50%;
  background: var(--ink);
  box-shadow: 0 0 0 4px rgba(43, 245, 196, 0.1);
}

.page-about .timeline__item--milestone::before {
  border-color: var(--amber);
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 138, 61, 0.14);
}

.page-about .timeline__phase {
  display: inline-block;
  margin-bottom: 0.3rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-about .timeline__title {
  margin: 0 0 0.35rem;
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .timeline__text {
  margin: 0;
  max-width: 62ch;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--about-text);
}

/* ---------- 03 资料库图例 ---------- */
.page-about .coverage-map {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: 1.4rem 0 0;
  padding: 0;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .coverage-map__item {
  background: var(--carbon);
  border-left: 3px solid var(--neon);
  padding: 1rem 1.05rem 1.15rem;
}

.page-about .coverage-map__coord {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .coverage-map__value {
  display: block;
  margin: 0.25rem 0 0.1rem;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.7rem, 4.4vw, 2.3rem);
  line-height: 1.05;
  color: var(--neon);
}

.page-about .coverage-map__label {
  display: block;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .coverage-map__note {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .cadence {
  list-style: none;
  display: grid;
  gap: 0.8rem;
  margin: 1.4rem 0 0;
  padding: 1.1rem 1.15rem;
  border: 2px dashed var(--line);
  background: rgba(27, 36, 32, 0.55);
}

.page-about .cadence__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.6rem;
}

.page-about .cadence__time {
  min-width: 6.5rem;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--amber);
}

.page-about .cadence__what {
  font-size: 0.95rem;
  color: var(--about-text);
}

/* ---------- 04 团队 ---------- */
.page-about .team-roster {
  list-style: none;
  display: grid;
  gap: 1rem;
  margin: 1.4rem 0 0;
  padding: 0;
}

.page-about .team-roster__item {
  position: relative;
  padding: 1.15rem 1.1rem 1.25rem;
  border: 2px solid var(--line);
  background: var(--carbon);
  box-shadow: var(--shadow-hard);
}

.page-about .team-roster__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.8rem, 4.5vw, 2.4rem);
  line-height: 1;
  color: var(--paper);
}

.page-about .team-roster__role {
  display: block;
  margin: 0.45rem 0 0.5rem;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--neon);
}

.page-about .team-roster__text {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 05 合作生态 ---------- */
.page-about .eco-legend {
  list-style: none;
  display: grid;
  gap: 0.75rem;
  margin: 1.4rem 0 0;
  padding: 0;
}

.page-about .eco-legend__item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.5rem 0.8rem;
  padding: 0.85rem 1rem;
  border: 2px solid var(--line);
  background: var(--carbon);
  outline: none;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .eco-legend__item:hover,
.page-about .eco-legend__item:focus-visible {
  border-color: var(--neon);
  transform: translateX(4px);
}

.page-about .eco-legend__swatch {
  display: block;
  width: 12px;
  height: 12px;
}

.page-about .eco-legend__swatch--neon { background: var(--neon); }
.page-about .eco-legend__swatch--amber { background: var(--amber); }
.page-about .eco-legend__swatch--lime { background: var(--lime); }

.page-about .eco-legend__name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--paper);
}

.page-about .eco-legend__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1rem;
  color: var(--mist);
  transition: color 0.2s var(--ease);
}

.page-about .eco-legend__item:hover .eco-legend__value,
.page-about .eco-legend__item:focus-visible .eco-legend__value {
  color: var(--neon);
}

.page-about .eco-legend__tip {
  grid-column: 2 / -1;
  font-size: 0.83rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .honor-strip {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: 1.4rem 0 0;
  padding: 0;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .honor-item {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 1.1rem 1.15rem;
  background: var(--panel);
}

.page-about .honor-item__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 4vw, 2rem);
  line-height: 1;
  color: var(--amber);
}

.page-about .honor-item__text {
  font-size: 0.93rem;
  line-height: 1.7;
  color: var(--about-text);
}

/* ---------- 06 读者规模与收束 ---------- */
.page-about .reach-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 1.4rem 0 0;
  padding: 0;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .reach-cell {
  background: var(--carbon);
  padding: 1rem;
}

.page-about .reach-cell__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 4vw, 2rem);
  line-height: 1.05;
  color: var(--neon);
}

.page-about .reach-cell__label {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1.6rem;
  padding: 1.35rem 1.25rem;
  border: 2px solid var(--neon);
  background: linear-gradient(135deg, rgba(43, 245, 196, 0.11), rgba(255, 138, 61, 0.08));
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 56ch;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--paper);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 760px) {
  .page-about .team-roster {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(1.6rem, 4vw, 3.2rem);
  }
}

@media (min-width: 960px) {
  .page-about .about-chapter__grid {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    gap: clamp(1.6rem, 4vw, 3.2rem);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-offset) + 1.5rem);
    flex-direction: column;
    align-items: flex-start;
    gap: 0.3rem;
    padding-left: 0.9rem;
    border-left-width: 4px;
  }
}

@media (min-width: 1100px) {
  .page-about .coverage-map {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (max-width: 520px) {
  .page-about .about-figures {
    grid-template-columns: 1fr;
  }

  .page-about .reach-grid {
    grid-template-columns: 1fr;
  }

  .page-about .team-roster__item,
  .page-about .about-figures,
  .page-about .media-frame {
    box-shadow: 4px 4px 0 0 rgba(0, 0, 0, 0.5);
  }
}