.page-about {
  background: var(--sand);
  color: var(--ink);
  font-family: var(--sans);
  overflow-x: hidden;
}

.page-about .about-mast {
  padding-block: clamp(24px, 4vw, 44px) clamp(40px, 6vw, 72px);
}

.page-about .about-h1 {
  margin: 0.35em 0 0.45em;
  font-size: clamp(2.1rem, 7.2vw, 4.9rem);
  font-weight: 200;
  line-height: 1.04;
  letter-spacing: -0.02em;
  max-width: 15ch;
  color: var(--deep);
}

.page-about .about-h1 strong {
  display: inline-block;
  font-weight: 900;
  color: var(--deep);
  transform: skewX(-4deg);
  border-bottom: 8px solid var(--coral);
  padding-bottom: 0.04em;
}

.page-about .about-sub {
  margin: 0;
  max-width: 34em;
  font-size: clamp(1rem, 1.7vw, 1.16rem);
  line-height: 1.8;
  color: var(--rock);
}

.page-about .mast-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 30px;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding-top: 18px;
  border-top: 1px solid rgba(58, 74, 75, 0.22);
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--rock);
}

.page-about .mast-meta span::before {
  content: "◆";
  margin-right: 0.55em;
  font-size: 0.68em;
  vertical-align: 0.16em;
  color: var(--coral);
}

/* ---------- 章节色带 ---------- */
.page-about .about-band {
  padding-block: 0;
  position: relative;
}

.page-about .about-band--stone {
  background: var(--stone);
}

.page-about .about-band--moss {
  background: var(--moss-tint);
}

.page-about .about-band--deep {
  background: radial-gradient(130% 150% at 12% 0%, var(--deep-2), var(--deep) 62%);
  color: var(--sand);
  clip-path: polygon(0 0, 100% 52px, 100% 100%, 0 100%);
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding-block: clamp(44px, 6vw, 78px);
}

.page-about .about-band--deep .chapter {
  padding-block: clamp(92px, 9vw, 124px) clamp(56px, 7vw, 88px);
}

.page-about .chapter-num {
  display: block;
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--coral-deep);
}

.page-about .about-band--deep .chapter-num {
  color: var(--fluor);
}

.page-about .chapter-title {
  margin: 0 0 8px;
  font-size: clamp(1.42rem, 4.6vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.25;
  color: var(--deep);
}

.page-about .about-band--deep .chapter-title {
  color: var(--sand);
}

.page-about .chapter-body {
  max-width: 40em;
}

.page-about .chapter-body p {
  margin: 0 0 1em;
  font-size: clamp(0.95rem, 1.5vw, 1.02rem);
  line-height: 1.85;
  color: var(--rock);
}

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

.page-about .chapter-body a {
  color: var(--teal-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--teal);
}

.page-about .chapter-body a:hover {
  color: var(--coral-deep);
  border-bottom-color: var(--coral);
}

.page-about .about-band--deep .chapter-body p {
  color: rgba(245, 240, 230, 0.78);
}

.page-about .chapter-lead {
  font-size: clamp(1.04rem, 2.1vw, 1.28rem) !important;
  font-weight: 500;
  line-height: 1.65 !important;
  color: var(--deep) !important;
  padding-left: 16px;
  border-left: 3px solid var(--teal);
  margin-bottom: 1.4em !important;
}

.page-about .about-band--deep .chapter-lead {
  color: var(--sand) !important;
  border-left-color: var(--fluor);
}

.page-about .note-aside {
  margin-top: 24px;
  padding: 4px 0 4px 18px;
  border-left: 2px solid var(--moss);
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--rock);
  max-width: 34em;
}

/* ---------- 栏目地图 ---------- */
.page-about .map-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .map-row {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr);
  column-gap: 16px;
  row-gap: 5px;
  padding-block: clamp(16px, 2.4vw, 22px);
  border-top: 1px solid rgba(58, 74, 75, 0.18);
}

.page-about .map-row:last-child {
  border-bottom: 1px solid rgba(58, 74, 75, 0.18);
}

.page-about .map-num {
  grid-column: 1;
  grid-row: 1;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--clay);
  padding-top: 0.5em;
}

.page-about .map-name {
  grid-column: 2;
  font-size: 1.06rem;
  font-weight: 800;
  color: var(--deep);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-about a.map-name:hover {
  color: var(--teal-deep);
  border-bottom-color: var(--coral);
}

.page-about .map-name--here {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  cursor: default;
}

.page-about .map-name--here i {
  font-family: var(--mono);
  font-style: normal;
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  color: var(--teal-deep);
  border: 1px solid var(--teal);
  border-radius: 999px;
  padding: 2px 9px;
  white-space: nowrap;
}

.page-about .map-desc {
  grid-column: 2;
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.75;
  color: var(--rock);
}

/* ---------- 版本时间线 ---------- */
.page-about .ver-figure {
  margin: clamp(22px, 3vw, 34px) 0 clamp(28px, 4vw, 42px);
}

.page-about .ver-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ver-item {
  position: relative;
  padding-left: clamp(26px, 3.6vw, 42px);
}

.page-about .ver-item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 20px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--fluor);
  box-shadow: 0 0 0 3px rgba(111, 247, 228, 0.14);
}

.page-about .ver-item::after {
  content: "";
  position: absolute;
  left: 7px;
  top: 33px;
  bottom: 4px;
  width: 1px;
  background: linear-gradient(to bottom, rgba(111, 247, 228, 0.34), rgba(111, 247, 228, 0.04));
}

.page-about .ver-item:last-child::after {
  display: none;
}

.page-about .ver-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding-block: 12px;
  cursor: pointer;
  list-style: none;
  transition: transform 180ms var(--ease);
}

.page-about .ver-head::-webkit-details-marker {
  display: none;
}

.page-about .ver-head:hover {
  transform: translateX(3px);
}

.page-about .ver-num {
  font-family: var(--mono);
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  color: var(--fluor);
}

.page-about .ver-title {
  flex: 1 1 auto;
  font-size: clamp(1.04rem, 2.4vw, 1.34rem);
  font-weight: 800;
  color: var(--sand);
}

.page-about .ver-tag {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  color: var(--coral);
  border: 1px solid rgba(255, 106, 61, 0.55);
  border-radius: 999px;
  padding: 2px 10px;
}

.page-about .ver-head::after {
  content: "+";
  font-family: var(--mono);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--mist);
}

.page-about .ver[open] .ver-head::after {
  content: "–";
  color: var(--fluor);
}

.page-about .ver-body {
  padding-bottom: 16px;
  padding-right: 8px;
}

.page-about .ver-body p {
  margin: 0;
  max-width: 36em;
  font-size: 0.93rem;
  line-height: 1.85;
  color: rgba(245, 240, 230, 0.75);
}

.page-about .ver-hint {
  margin: 22px 0 0;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ---------- 图片容器 ---------- */
.page-about .media {
  margin: 0;
}

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

.page-about .figure-cap {
  margin-top: 10px;
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--rock);
}

.page-about .about-band--deep .figure-cap {
  color: rgba(245, 240, 230, 0.58);
}

.page-about .team-figure {
  margin: clamp(20px, 3vw, 32px) 0 clamp(24px, 3.6vw, 40px);
}

.page-about .device-figure {
  margin: clamp(24px, 3.6vw, 38px) 0 clamp(20px, 3vw, 30px);
}

/* ---------- 分工 ---------- */
.page-about .role-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-bottom: 1.4em;
  background: rgba(58, 74, 75, 0.16);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .role {
  background: var(--sand);
  padding: clamp(16px, 2.6vw, 26px);
}

.page-about .role-title {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--deep);
  padding-bottom: 8px;
  border-bottom: 2px solid var(--teal);
  display: inline-block;
}

.page-about .role p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--rock);
}

/* ---------- 团队与规模 ---------- */
.page-about .team-chart {
  margin: clamp(18px, 3vw, 28px) 0 clamp(20px, 3vw, 30px);
}

.page-about .team-bar {
  display: flex;
  height: 20px;
  border-radius: 999px;
  overflow: hidden;
  background: var(--paper);
}

.page-about .team-seg {
  display: block;
  height: 100%;
}

.page-about .team-seg--edit {
  flex: 6;
  background: var(--teal);
}

.page-about .team-seg--tech {
  flex: 4;
  background: var(--clay);
}

.page-about .team-seg--support {
  flex: 4;
  background: var(--moss);
}

.page-about .team-legend {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 26px;
  margin: 14px 0 0;
  padding: 0;
  font-size: 0.85rem;
  color: var(--rock);
}

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

.page-about .team-legend b {
  font-family: var(--mono);
  font-size: 0.98rem;
  color: var(--deep);
}

.page-about .legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.page-about .legend-dot--edit {
  background: var(--teal);
}

.page-about .legend-dot--tech {
  background: var(--clay);
}

.page-about .legend-dot--support {
  background: var(--moss);
}

.page-about .stat-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(14px, 2.4vw, 26px);
  margin: 0 0 clamp(24px, 4vw, 36px);
}

.page-about .stat {
  border-top: 2px solid var(--teal);
  padding-top: 12px;
}

.page-about .stat-num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--deep);
}

.page-about .stat-label {
  display: block;
  margin-top: 4px;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--rock);
}

.page-about .device-detail {
  margin-top: 20px;
  border: 1px solid rgba(58, 74, 75, 0.24);
  border-radius: var(--r-md);
  padding: 14px 18px;
  background: var(--paper);
  max-width: 36em;
}

.page-about .device-detail summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--teal-deep);
}

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

.page-about .device-detail summary::before {
  content: "▸ ";
  color: var(--coral);
}

.page-about .device-detail[open] summary::before {
  content: "▾ ";
}

.page-about .device-detail p {
  margin: 12px 0 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--rock);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding-block: clamp(46px, 6.5vw, 88px);
  border-top: 4px solid var(--teal);
  background: linear-gradient(180deg, var(--sand-2), var(--sand));
}

.page-about .cta-title {
  margin: 0 0 10px;
  font-size: clamp(1.5rem, 4.2vw, 2.2rem);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--deep);
}

.page-about .cta-text {
  margin: 0 0 26px;
  max-width: 34em;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--rock);
}

.page-about .cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

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

@media (min-width: 880px) {
  .page-about .chapter {
    grid-template-columns: minmax(0, 118px) minmax(0, 1fr);
    grid-template-areas:
      "num title"
      "num body";
    column-gap: clamp(24px, 4vw, 64px);
    row-gap: 20px;
    align-items: start;
  }

  .page-about .chapter-num {
    grid-area: num;
    font-size: clamp(2.4rem, 4.4vw, 3.8rem);
    font-weight: 200;
    line-height: 0.9;
    letter-spacing: -0.02em;
    color: rgba(58, 74, 75, 0.3);
  }

  .page-about .about-band--deep .chapter-num {
    color: rgba(111, 247, 228, 0.42);
  }

  .page-about .chapter-title {
    grid-area: title;
    margin-bottom: 0;
  }

  .page-about .chapter-body {
    grid-area: body;
  }

  .page-about .map-row {
    grid-template-columns: 3rem minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ver-head,
  .page-about .map-name {
    transition: none;
  }

  .page-about .ver-head:hover {
    transform: none;
  }

  .page-about .about-h1 strong {
    transform: none;
  }
}