.page-about {
  --about-shadow: 8px 8px 0 rgba(7, 19, 15, .9);
  --about-border: 1px solid rgba(184, 199, 190, .22);
  color-scheme: dark;
}

.page-about .breadcrumbs {
  padding-top: 16px;
}

.page-about .about-sec,
.page-about .version-entry {
  scroll-margin-top: 96px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4vw, 44px) 0 clamp(40px, 6vw, 76px);
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(44, 40, 86, .55) 0%, rgba(7, 19, 15, 0) 58%),
    radial-gradient(90% 70% at 0% 100%, rgba(18, 58, 51, .75) 0%, rgba(7, 19, 15, 0) 62%);
}

.page-about .hero-grid {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  align-items: start;
}

.page-about .hero-narrative .eyebrow {
  margin: 0;
}

.page-about .hero-narrative h1 {
  margin: 10px 0 18px;
  line-height: .98;
  letter-spacing: -.015em;
}

.page-about .hero-narrative .lede {
  max-width: 58ch;
  margin: 0;
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 1px;
  margin-top: clamp(24px, 4vw, 36px);
  background: rgba(184, 199, 190, .22);
  border: var(--about-border);
}

.page-about .hero-stat {
  background: var(--ink);
  padding: 15px 13px 17px;
  transition: background .25s var(--ease);
}

.page-about .hero-stat:hover,
.page-about .hero-stat:focus-visible {
  background: var(--charcoal);
}

.page-about .hero-stat:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -2px;
}

.page-about .hero-stat .num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1;
  color: var(--lime);
  letter-spacing: -.02em;
}

.page-about .hero-stat .caption {
  display: block;
  margin-top: 9px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--steel);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .hero-visual {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid rgba(184, 199, 190, .3);
  background: var(--charcoal);
  box-shadow: 10px 10px 0 rgba(74, 35, 51, .5);
}

.page-about .hero-visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  filter: brightness(.6) saturate(.82) contrast(1.06);
}

.page-about .hero-visual::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background-image: repeating-linear-gradient(0deg, rgba(200, 255, 61, .07) 0 1px, transparent 1px 4px);
}

.page-about .hero-visual::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  z-index: 3;
  background: linear-gradient(90deg, var(--lime) 0 46%, var(--orange) 46% 100%);
}

.page-about .hero-badge {
  position: absolute;
  left: 14px;
  bottom: 18px;
  z-index: 4;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 12px;
  background: rgba(7, 19, 15, .82);
  border: 1px solid rgba(200, 255, 61, .45);
  font-size: 12px;
  color: var(--mist);
}

.page-about .hero-badge strong {
  font-family: var(--font-num);
  font-size: 14px;
  color: var(--lime);
}

/* ---------- 页内目录 ---------- */
.page-about .about-jump {
  background: var(--charcoal);
  border-top: var(--hair);
  border-bottom: var(--hair);
}

.page-about .jump-scroll {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-top: 12px;
  padding-bottom: 12px;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .jump-link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 13px;
  border: 1px solid rgba(184, 199, 190, .28);
  color: var(--body-dim);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}

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

.page-about .jump-num {
  font-family: var(--font-num);
  font-size: 11px;
  opacity: .72;
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding: clamp(44px, 6vw, 88px) 0;
}

.page-about .about-sec .section-head .lede {
  max-width: 62ch;
}

/* ---------- 三条主线 ---------- */
.page-about .thread-grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .thread {
  position: relative;
  padding: 26px 20px 22px;
  background: var(--charcoal);
  border: var(--about-border);
  box-shadow: 6px 6px 0 rgba(7, 19, 15, .95);
  transition: transform .25s var(--ease), border-color .25s var(--ease);
}

.page-about .thread:hover {
  transform: translateY(-3px);
  border-color: rgba(200, 255, 61, .45);
}

.page-about .thread::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 54px;
  height: 3px;
  background: var(--lime);
}

.page-about .thread:nth-child(2)::after {
  background: var(--orange);
}

.page-about .thread:nth-child(3)::after {
  background: var(--steel);
}

.page-about .thread-idx {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-num);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--steel);
}

.page-about .thread h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.4vw, 26px);
  letter-spacing: .01em;
  color: var(--mist);
}

.page-about .thread p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--body-dim);
}

.page-about .thread-foot {
  margin: 0 !important;
  padding-top: 12px;
  border-top: 1px dashed rgba(184, 199, 190, .26);
  font-family: var(--font-num);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--lime);
}

/* ---------- 复核节奏 ---------- */
.page-about .cadence {
  background: linear-gradient(180deg, rgba(22, 27, 26, 0) 0%, rgba(22, 27, 26, .85) 100%);
  border-top: var(--hair);
  border-bottom: var(--hair);
}

.page-about .cadence-grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
}

.page-about .cadence-figure {
  margin: 0;
  overflow: hidden;
  background: var(--pen, var(--deep));
  border: 1px solid rgba(184, 199, 190, .28);
  box-shadow: 8px 8px 0 rgba(74, 35, 51, .5);
}

.page-about .cadence-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: brightness(.78) saturate(.9);
}

.page-about .cadence-body .lede {
  max-width: 56ch;
}

.page-about .cadence-list {
  list-style: none;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(184, 199, 190, .22);
  border: var(--about-border);
}

.page-about .cadence-row {
  display: grid;
  gap: 5px;
  padding: 14px 16px;
  background: var(--ink);
}

.page-about .cadence-time {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--orange);
}

.page-about .cadence-row p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--body-dim);
}

/* ---------- 团队 Bento ---------- */
.page-about .team-bento {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .team-card {
  position: relative;
  padding: 20px 18px 22px;
  background: var(--charcoal);
  border: 1px solid rgba(184, 199, 190, .2);
  transition: background .25s var(--ease), border-color .25s var(--ease), transform .25s var(--ease);
}

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

.page-about .team-card--a { background: var(--deep); }
.page-about .team-card--b { background: var(--wine); }
.page-about .team-card--c { background: var(--indigo); }
.page-about .team-card--d { background: var(--charcoal); }

.page-about .team-count {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(36px, 5vw, 58px);
  line-height: .95;
  color: var(--lime);
  letter-spacing: -.03em;
}

.page-about .team-role {
  display: block;
  margin-top: 8px;
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: .05em;
  color: var(--mist);
}

.page-about .team-duty {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--body-dim);
}

/* ---------- 版本阶段 ---------- */
.page-about .versions {
  position: relative;
  overflow: hidden;
  border-top: var(--hair);
  border-bottom: var(--hair);
}

.page-about .versions-tex {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: cover;
  opacity: .16;
  pointer-events: none;
}

.page-about .versions-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-about .versions-rail .lede {
  max-width: 42ch;
}

.page-about .version-index {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0 0 0 16px;
  border-left: 1px solid rgba(184, 199, 190, .3);
  display: grid;
  gap: 2px;
}

.page-about .version-index a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0;
  font-size: 13.5px;
  color: var(--body-dim);
  text-decoration: none;
  transition: color .2s var(--ease), padding-left .2s var(--ease);
}

.page-about .version-index a:hover,
.page-about .version-index a:focus-visible {
  color: var(--lime);
  padding-left: 6px;
}

.page-about .v-idx {
  font-family: var(--font-num);
  font-size: 11px;
  color: var(--steel);
}

.page-about .version-log {
  display: grid;
  gap: 14px;
}

.page-about .version-entry {
  background: var(--charcoal);
  border: var(--about-border);
  box-shadow: 6px 6px 0 rgba(143, 179, 201, .14);
}

.page-about .version-entry .disclosure-trigger {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 17px 18px;
  background: transparent;
  border: 0;
  color: var(--mist);
  text-align: left;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 15px;
  transition: background .2s var(--ease);
}

.page-about .version-entry .disclosure-trigger:hover,
.page-about .version-entry .disclosure-trigger:focus-visible {
  background: rgba(200, 255, 61, .08);
}

.page-about .v-tag {
  flex: 0 0 auto;
  padding: 4px 8px;
  border: 1px solid rgba(200, 255, 61, .55);
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--lime);
}

.page-about .v-title {
  flex: 1 1 auto;
  font-family: var(--font-display);
  font-size: clamp(16px, 2vw, 21px);
  letter-spacing: .02em;
  line-height: 1.35;
}

.page-about .version-entry .disclosure-panel {
  padding: 2px 18px 18px;
}

.page-about .version-entry .disclosure-panel p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--body-dim);
}

.page-about .version-entry .disclosure-panel ul {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 6px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 覆盖范围斜切带 ---------- */
.page-about .coverage {
  margin: clamp(12px, 3vw, 28px) 0;
  padding: clamp(58px, 9vw, 104px) 0;
  background:
    linear-gradient(132deg, rgba(74, 35, 51, .92) 0%, rgba(44, 40, 86, .95) 52%, rgba(18, 58, 51, .96) 100%);
  clip-path: polygon(0 2.4%, 100% 0, 100% 97.6%, 0 100%);
}

.page-about .coverage-inner .lede {
  max-width: 66ch;
}

.page-about .coverage-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(138px, 1fr));
  gap: 10px;
  margin-top: clamp(24px, 4vw, 38px);
}

.page-about .cov-item {
  padding: 15px 13px;
  background: rgba(7, 19, 15, .45);
  border: 1px solid rgba(234, 242, 230, .18);
}

.page-about .cov-num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1;
  color: var(--lime);
}

.page-about .cov-label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--mist);
  opacity: .88;
}

/* ---------- 合作方式 ---------- */
.page-about .join-grid {
  display: grid;
  gap: clamp(24px, 4vw, 42px);
  align-items: start;
}

.page-about .join-main .lede {
  max-width: 58ch;
}

.page-about .join-list {
  list-style: none;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .join-item {
  display: grid;
  gap: 6px;
  padding: 15px 17px;
  background: var(--charcoal);
  border-left: 3px solid var(--lime);
}

.page-about .join-item:nth-child(2) { border-left-color: var(--orange); }
.page-about .join-item:nth-child(3) { border-left-color: var(--steel); }

.page-about .join-item strong {
  font-family: var(--font-display);
  font-size: 17px;
  letter-spacing: .04em;
  color: var(--mist);
}

.page-about .join-item span {
  font-size: 14px;
  line-height: 1.7;
  color: var(--body-dim);
}

.page-about .join-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(20px, 3vw, 28px) 0 0;
}

.page-about .join-card {
  padding: clamp(20px, 3vw, 28px);
  background: var(--deep);
  border: 1px solid rgba(200, 255, 61, .32);
  box-shadow: 8px 8px 0 rgba(7, 19, 15, .95);
}

.page-about .join-card h3 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: .05em;
  color: var(--mist);
}

.page-about .join-contact {
  margin: 0;
  display: grid;
  gap: 12px;
}

.page-about .join-row {
  display: grid;
  gap: 3px;
  padding-bottom: 11px;
  border-bottom: 1px dashed rgba(184, 199, 190, .24);
}

.page-about .join-row dt {
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--steel);
}

.page-about .join-row dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--mist);
  word-break: break-word;
}

.page-about .join-note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--body-dim);
}

.page-about .join-icp {
  margin: 10px 0 0;
  font-family: var(--font-num);
  font-size: 11.5px;
  color: var(--steel);
}

.page-about .join-more {
  margin: 14px 0 0;
  font-size: 13.5px;
}

.page-about .join-more a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 255, 61, .45);
}

.page-about .join-more a:hover,
.page-about .join-more a:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* ---------- 媒体查询 ---------- */
@media (min-width: 620px) {
  .page-about .cadence-row {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }
}

@media (min-width: 760px) {
  .page-about .team-bento {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .team-card--a { grid-column: span 7; }
  .page-about .team-card--b { grid-column: span 5; }
  .page-about .team-card--c { grid-column: span 5; }
  .page-about .team-card--d { grid-column: span 7; }
}

@media (min-width: 780px) {
  .page-about .thread-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .cadence-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .join-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 940px) {
  .page-about .versions-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  }

  .page-about .versions-rail {
    position: sticky;
    top: 96px;
  }
}

@media (min-width: 760px) and (hover: hover) {
  .page-about .team-duty {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height .38s var(--ease), opacity .3s var(--ease), margin-top .3s var(--ease);
  }

  .page-about .team-card:hover .team-duty,
  .page-about .team-card:focus-within .team-duty,
  .page-about .team-card:focus .team-duty {
    max-height: 260px;
    margin-top: 12px;
    opacity: 1;
  }

  .page-about .team-card:hover {
    transform: translateY(-2px);
  }
}

@media (min-width: 1024px) {
  .page-about .hero-narrative .lede {
    font-size: 17px;
  }
}

@media (max-width: 420px) {
  .page-about .coverage {
    clip-path: polygon(0 1.2%, 100% 0, 100% 98.8%, 0 100%);
  }

  .page-about .hero-badge {
    left: 10px;
    bottom: 14px;
    font-size: 11px;
  }
}

.page-about {
  --pen: transparent;
}