.page-about {
  --about-text-dim: rgba(242, 245, 236, 0.74);
  --about-glass-bg: rgba(255, 255, 255, 0.028);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(22px, 4vw, 40px);
  padding-bottom: clamp(28px, 5vw, 56px);
}

.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  list-style: none;
  margin: 0 0 clamp(20px, 4vw, 32px);
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--blue);
}

.page-about .about-crumb li + li::before {
  content: "/";
  margin-right: 10px;
  color: var(--line-strong);
}

.page-about .about-crumb [aria-current="page"] {
  color: var(--lime);
}

.page-about .about-crumb .tac-breadcrumb__link {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-about .about-crumb .tac-breadcrumb__link:hover,
.page-about .about-crumb .tac-breadcrumb__link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--lime);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 11vw, 92px);
  line-height: 0.95;
  letter-spacing: -0.01em;
  margin: 0 0 clamp(16px, 3vw, 24px);
  max-width: 16ch;
}

.page-about .about-hero__lede {
  max-width: 58ch;
  margin: 0 0 clamp(18px, 3vw, 26px);
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-text-dim);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 0;
  padding: 12px 0 0;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--blue);
}

.page-about .about-hero__figure {
  position: relative;
  margin: clamp(24px, 4vw, 40px) 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-2);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  max-width: 100%;
}

.page-about .about-hero__tag {
  position: absolute;
  left: 14px;
  bottom: 14px;
  padding: 5px 11px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(7, 19, 15, 0.74);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--lime);
}

/* ---------- 章节索引条 ---------- */
.page-about .about-index {
  background: var(--ink-2);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-index__inner {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 10px 0;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__inner::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__link {
  flex: 0 0 auto;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--blue);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.24s var(--ease), background-color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  padding: clamp(36px, 7vw, 76px) 0;
}

.page-about .about-chapter::before {
  content: "";
  display: block;
  width: min(220px, 46%);
  height: 6px;
  margin-bottom: clamp(24px, 4vw, 40px);
  border-radius: 3px;
  background: linear-gradient(
    90deg,
    var(--lime) 0 58%,
    var(--orange) 58% 80%,
    rgba(143, 166, 184, 0.28) 80% 100%
  );
}

.page-about .about-chapter__head {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(20px, 3.5vw, 34px);
}

@media (min-width: 780px) {
  .page-about .about-chapter__head {
    grid-template-columns: 92px minmax(0, 1fr);
    align-items: start;
    gap: 24px;
  }
}

.page-about .about-chapter__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.2vw, 26px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--lime);
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 5vw, 42px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.01em;
}

.page-about .about-prose p {
  margin: 0 0 1.05em;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-text-dim);
}

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

.page-about .about-prose strong {
  color: var(--paper);
  font-weight: 500;
}

.page-about .about-statement {
  margin: clamp(22px, 4vw, 34px) 0 0;
  padding-left: clamp(14px, 3vw, 22px);
  border-left: 3px solid var(--orange);
  max-width: 30ch;
  font-family: var(--font-display);
  font-size: clamp(21px, 3.8vw, 32px);
  font-weight: 700;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--paper);
}

/* ---------- 覆盖矩阵 ---------- */
.page-about .about-matrix {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 6px;
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 14px;
  padding: 0;
}

@media (min-width: 560px) {
  .page-about .about-matrix {
    grid-template-columns: repeat(10, minmax(0, 1fr));
    max-width: 640px;
  }
}

@media (min-width: 900px) {
  .page-about .about-matrix {
    grid-template-columns: repeat(17, minmax(0, 1fr));
    max-width: 760px;
    gap: 7px;
  }
}

.page-about .about-matrix__cell {
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(143, 166, 184, 0.05);
  font-family: var(--font-mono);
  font-size: 10px;
  color: rgba(143, 166, 184, 0.6);
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease),
    color 0.24s var(--ease), background-color 0.24s var(--ease);
}

.page-about .about-matrix__cell--main {
  background: rgba(200, 244, 90, 0.1);
  border-color: var(--lime-dim);
  color: var(--lime);
}

.page-about .about-matrix__cell:hover {
  transform: translateY(-2px);
  border-color: var(--orange);
  color: var(--paper);
  background: rgba(255, 138, 61, 0.12);
}

.page-about .about-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--blue);
}

.page-about .about-legend__key {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-legend__swatch {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 3px;
  flex: 0 0 auto;
}

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

.page-about .about-legend__swatch--blue {
  background: rgba(143, 166, 184, 0.35);
  border: 1px solid var(--line-strong);
}

/* ---------- 数字条 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(20px, 3.5vw, 32px) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.page-about .about-stat {
  background: var(--ink-2);
  padding: clamp(14px, 2.4vw, 20px);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 4.6vw, 32px);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--lime);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.55;
  color: var(--blue);
}

/* ---------- 值班表 ---------- */
.page-about .about-shifts {
  display: grid;
  gap: 10px;
  margin-top: clamp(20px, 3.5vw, 30px);
}

@media (min-width: 860px) {
  .page-about .about-shifts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-shift {
  position: relative;
  padding: 20px 16px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--about-glass-bg);
  overflow: hidden;
}

.page-about .about-shift::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--lime), rgba(200, 244, 90, 0) 72%);
}

.page-about .about-shift__slot {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .about-shift__name {
  margin: 8px 0 8px;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-shift__desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.68;
  color: var(--about-text-dim);
}

/* ---------- 版本演进 ---------- */
.page-about .about-era {
  display: grid;
  gap: clamp(24px, 4vw, 36px);
  margin-top: clamp(22px, 4vw, 32px);
}

.page-about .about-era__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-2);
}

.page-about .about-era__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--lime), rgba(143, 166, 184, 0.18));
}

.page-about .about-node {
  position: relative;
  padding: 0 0 26px 34px;
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--orange);
  z-index: 1;
}

.page-about .about-node--current::before {
  border-color: var(--lime);
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(200, 244, 90, 0.16);
}

.page-about .about-node__era {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .about-node--current .about-node__era {
  color: var(--lime);
}

.page-about .about-node__title {
  margin: 6px 0 6px;
  font-size: 16px;
  font-weight: 500;
  line-height: 1.38;
  color: var(--paper);
}

.page-about .about-node__desc {
  margin: 0;
  max-width: 46ch;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--about-text-dim);
}

@media (min-width: 980px) {
  .page-about .about-era {
    grid-template-columns: 300px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-timeline::before {
    left: 50%;
    top: 10px;
    bottom: 10px;
    transform: translateX(-1px);
  }

  .page-about .about-node {
    width: 50%;
    padding: 0 42px 32px 0;
    text-align: right;
  }

  .page-about .about-node:nth-child(even) {
    margin-left: 50%;
    padding: 0 0 32px 42px;
    text-align: left;
  }

  .page-about .about-node::before {
    left: auto;
    right: -8px;
    top: 4px;
  }

  .page-about .about-node:nth-child(even)::before {
    left: -8px;
    right: auto;
  }

  .page-about .about-node__desc {
    margin-left: auto;
  }

  .page-about .about-node:nth-child(even) .about-node__desc {
    margin-left: 0;
  }

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

  .page-about .about-node:nth-child(even):last-child {
    padding-bottom: 0;
  }
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(22px, 4vw, 36px);
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }
}

.page-about .about-roles {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-role {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-role__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--lime);
}

.page-about .about-role__name {
  margin: 0 0 5px;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .about-role__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--about-text-dim);
}

.page-about .about-team__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-2);
}

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

/* ---------- 来源与合作 ---------- */
.page-about .about-sources {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.page-about .about-source {
  background: var(--ink-2);
  padding: clamp(16px, 2.6vw, 22px);
  transition: background-color 0.24s var(--ease);
}

.page-about .about-source:hover {
  background: var(--ink-3);
}

.page-about .about-source__tag {
  display: inline-block;
  margin-bottom: 9px;
  padding-bottom: 2px;
  border-bottom: 1px solid rgba(255, 138, 61, 0.45);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .about-source__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--about-text-dim);
}

/* ---------- 收尾入口 ---------- */
.page-about .about-cta {
  margin: clamp(36px, 6vw, 64px) 0 clamp(40px, 7vw, 80px);
  padding: clamp(24px, 4.5vw, 44px);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 140% at 0% 0%, rgba(200, 244, 90, 0.14), rgba(200, 244, 90, 0) 58%),
    var(--ink-2);
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(24px, 4.4vw, 36px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.01em;
}

.page-about .about-cta__text {
  margin: 0 0 clamp(16px, 3vw, 24px);
  max-width: 52ch;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-text-dim);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 减少动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-matrix__cell,
  .page-about .about-source,
  .page-about .about-index__link,
  .page-about .about-crumb .tac-breadcrumb__link {
    transition: none;
  }

  .page-about .about-matrix__cell:hover {
    transform: none;
  }
}