.page-about {
  --about-notch: 20px;
  --about-bar-track: rgba(242, 237, 226, .12);
  --about-slate: #6E7A70;
}

/* ---------- 顶部上下文条 ---------- */
.page-about .about-topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .6rem 1rem;
  padding-block: 1.25rem .5rem;
}

.page-about .about-stamp {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--bone-dim);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(1.5rem, 4vw, 2.5rem) clamp(2rem, 5vw, 3.75rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(115% 85% at 6% 0%, rgba(91, 122, 86, .42), transparent 64%),
    linear-gradient(112deg, transparent 52%, rgba(121, 215, 242, .10) 52%, rgba(121, 215, 242, .10) 58%, transparent 58%);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 76%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  display: grid;
  gap: var(--gap);
}

.page-about .about-hero-copy h1 {
  margin: .35rem 0 .9rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5.4vw, 3.4rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -.012em;
  color: var(--bone);
  max-width: 20ch;
}

.page-about .about-lede {
  margin: 0 0 1.5rem;
  max-width: 58ch;
  font-size: clamp(1rem, 1.6vw, 1.06rem);
  line-height: 1.85;
  color: var(--bone-dim);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .85rem 1.25rem;
}

.page-about .about-hero-stats {
  padding: clamp(1rem, 2.5vw, 1.35rem);
  background: rgba(17, 22, 20, .86);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--about-notch)) 0, 100% var(--about-notch), 100% 100%, 0 100%);
}

.page-about .stat-row {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
}

.page-about .stat-row li {
  background: var(--ink-900);
  padding: .85rem .8rem;
}

.page-about .stat-row .stat {
  display: flex;
  flex-direction: column;
  gap: .25rem;
}

.page-about .stat-row .stat-value {
  font-family: var(--font-mono);
  font-size: clamp(1.45rem, 3.4vw, 2.1rem);
  font-weight: 600;
  line-height: 1;
  color: var(--gold);
}

.page-about .stat-row .stat-label {
  font-size: .77rem;
  letter-spacing: .04em;
  color: var(--bone-dim);
}

.page-about .about-hero-note {
  margin: 1rem 0 0;
  font-size: .84rem;
  line-height: 1.72;
  color: var(--bone-dim);
}

.page-about .about-hero-note strong {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--bone);
}

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  padding-block: clamp(2.5rem, 6vw, 4.25rem);
}

.page-about .about-block .section-title {
  margin: .3rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.4vw, 2.2rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -.005em;
  color: var(--bone);
}

.page-about .about-block .section-note {
  margin: .75rem 0 0;
  max-width: 64ch;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--bone-dim);
}

.page-about .about-subtitle {
  margin: 0 0 .9rem;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--bone);
}

.page-about .media-frame {
  margin: 0;
  overflow: hidden;
  background: var(--ink-800);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-notch)), calc(100% - var(--about-notch)) 100%, 0 100%);
}

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

.page-about .media-caption {
  display: block;
  padding: .7rem 1rem;
  font-size: .78rem;
  line-height: 1.65;
  color: var(--bone-dim);
  border-top: 1px solid var(--line);
}

/* ---------- 起点与定位 ---------- */
.page-about .about-origin-grid {
  display: grid;
  gap: var(--gap);
}

.page-about .about-origin-rail {
  padding-top: 1rem;
  border-top: 2px solid var(--moss);
}

.page-about .about-origin-body p {
  margin: 0 0 1rem;
  max-width: 66ch;
  font-size: .95rem;
  line-height: 1.88;
  color: var(--bone-dim);
}

.page-about .about-origin-body p:first-child {
  font-size: 1.03rem;
  color: var(--bone);
}

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

/* ---------- 团队与轮值 ---------- */
.page-about .about-team-head {
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-team-media {
  margin-bottom: var(--gap);
}

.page-about .about-team-grid {
  display: grid;
  gap: var(--gap);
}

.page-about .about-bars {
  display: grid;
  gap: .7rem;
}

.page-about .about-bar {
  padding: .85rem 1rem;
  background: var(--ink-800);
  border-left: 3px solid var(--rock);
  transition: border-color var(--ease), background var(--ease), transform var(--ease);
}

.page-about .about-bar:hover,
.page-about .about-bar:focus-within {
  border-left-color: var(--lime);
  background: var(--ink-700);
  transform: translateX(2px);
}

.page-about .about-bar-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.page-about .about-bar-name {
  font-size: .95rem;
  font-weight: 600;
  color: var(--bone);
}

.page-about .about-bar-num {
  font-family: var(--font-mono);
  font-size: .9rem;
  color: var(--bone-dim);
}

.page-about .about-bar-track {
  margin: .55rem 0 .45rem;
  height: 6px;
  background: var(--about-bar-track);
}

.page-about .about-bar-fill {
  display: block;
  height: 100%;
  width: var(--bar-w, 50%);
  background: var(--bar-color, var(--moss));
}

.page-about .about-bar-desc {
  margin: 0;
  font-size: .79rem;
  line-height: 1.62;
  color: var(--bone-dim);
}

.page-about .about-bar--data {
  --bar-w: 34.6%;
  --bar-color: var(--moss);
}

.page-about .about-bar--writer {
  --bar-w: 26.9%;
  --bar-color: var(--ice);
}

.page-about .about-bar--product {
  --bar-w: 23.1%;
  --bar-color: var(--clay);
}

.page-about .about-bar--ops {
  --bar-w: 15.4%;
  --bar-color: var(--about-slate);
}

.page-about .about-shifts {
  padding: clamp(1rem, 2.5vw, 1.5rem);
  background: var(--ink-800);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-notch)), calc(100% - var(--about-notch)) 100%, 0 100%);
}

.page-about .about-shift-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .65rem;
}

.page-about .about-shift-list li {
  display: grid;
  gap: .12rem;
  padding-bottom: .65rem;
  border-bottom: 1px dashed var(--line);
  font-size: .86rem;
  line-height: 1.7;
  color: var(--bone-dim);
}

.page-about .about-shift-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-shift-time {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .05em;
  color: var(--gold);
}

.page-about .about-shift-note {
  margin: 1rem 0 0;
  padding-top: .9rem;
  border-top: 1px solid var(--line);
  font-size: .84rem;
  line-height: 1.78;
  color: var(--bone-dim);
}

.page-about .about-shift-note strong {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--ice);
}

/* ---------- 版本演进 ---------- */
.page-about .about-versions-grid {
  display: grid;
  gap: var(--gap);
  margin-top: clamp(1.25rem, 3vw, 2rem);
}

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

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: .55rem;
  bottom: 1rem;
  width: 2px;
  background: linear-gradient(180deg, var(--gold), var(--line-strong) 58%, transparent);
}

.page-about .timeline-item {
  position: relative;
  padding-left: 2.35rem;
  padding-bottom: clamp(1.1rem, 2.6vw, 1.6rem);
}

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

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: .3rem;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--gold);
  box-shadow: 0 0 0 4px rgba(231, 180, 95, .12);
}

.page-about .timeline-year {
  display: block;
  margin-bottom: .22rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .09em;
  color: var(--gold);
}

.page-about .timeline-item h3 {
  margin: 0 0 .32rem;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--bone);
}

.page-about .timeline-item p {
  margin: 0;
  font-size: .87rem;
  line-height: 1.78;
  color: var(--bone-dim);
}

/* ---------- 运营标准 ---------- */
.page-about .about-audit {
  display: grid;
  gap: .7rem;
  margin-top: clamp(1.25rem, 3vw, 1.75rem);
}

.page-about .audit-step {
  padding: 1rem 1.15rem;
  background: var(--ink-800);
  border-top: 2px solid var(--rock);
  clip-path: polygon(0 0, calc(100% - var(--about-notch)) 0, 100% var(--about-notch), 100% 100%, 0 100%);
  transition: border-color var(--ease), background var(--ease);
}

.page-about .audit-step[open] {
  border-top-color: var(--lime);
  background: var(--ink-700);
}

.page-about .audit-step summary {
  display: flex;
  align-items: baseline;
  gap: .6rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: .97rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--bone);
}

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

.page-about .audit-no {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .07em;
  color: var(--lime);
}

.page-about .audit-step p {
  margin: .7rem 0 0;
  font-size: .85rem;
  line-height: 1.8;
  color: var(--bone-dim);
}

.page-about .about-partners {
  display: grid;
  gap: 1.1rem;
  margin-top: clamp(1.5rem, 4vw, 2.4rem);
  padding-top: clamp(1.25rem, 3vw, 1.75rem);
  border-top: 1px solid var(--line);
}

.page-about .about-partners p {
  margin: 0;
  font-size: .89rem;
  line-height: 1.85;
  color: var(--bone-dim);
}

.page-about .about-partners p + p {
  margin-top: .8rem;
}

.page-about .about-partner-tags {
  list-style: none;
  margin: 0 0 .9rem;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

/* ---------- 区域根基 ---------- */
.page-about .about-region-grid {
  display: grid;
  gap: var(--gap);
}

.page-about .about-region-text {
  margin: .8rem 0 0;
  max-width: 62ch;
  font-size: .93rem;
  line-height: 1.85;
  color: var(--bone-dim);
}

.page-about .about-contact {
  margin: 1.25rem 0 1.35rem;
  padding: .35rem 1.1rem;
  display: grid;
  gap: 0;
  background: var(--ink-800);
  border-left: 3px solid var(--moss);
}

.page-about .about-contact div {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: .3rem 1rem;
  padding: .55rem 0;
  border-bottom: 1px dashed var(--line);
}

.page-about .about-contact div:last-child {
  border-bottom: 0;
}

.page-about .about-contact dt {
  font-size: .79rem;
  letter-spacing: .03em;
  color: var(--bone-dim);
}

.page-about .about-contact dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .84rem;
  line-height: 1.6;
  color: var(--bone);
  word-break: break-word;
}

.page-about .about-region-note {
  margin: 0 0 1.35rem;
  font-size: .85rem;
  line-height: 1.78;
  color: var(--bone-dim);
}

.page-about .about-region-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .85rem 1.25rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-bar {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr);
    grid-template-areas:
      "head track"
      "desc track";
    column-gap: 1.25rem;
    align-items: center;
  }

  .page-about .about-bar-head {
    grid-area: head;
  }

  .page-about .about-bar-track {
    grid-area: track;
    margin: 0;
  }

  .page-about .about-bar-desc {
    grid-area: desc;
  }
}

@media (min-width: 820px) {
  .page-about .about-audit {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .about-partners {
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
    gap: clamp(1.5rem, 4vw, 3rem);
    align-items: start;
  }
}

@media (min-width: 920px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    align-items: end;
    gap: clamp(1.5rem, 4vw, 3rem);
  }

  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, .72fr) minmax(0, 1.28fr);
    gap: clamp(1.5rem, 4vw, 3.5rem);
    align-items: start;
  }

  .page-about .about-versions-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.12fr);
    gap: clamp(1.5rem, 4vw, 3rem);
    align-items: start;
  }

  .page-about .about-region-grid {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
    align-items: center;
    gap: clamp(1.5rem, 4vw, 3.5rem);
  }
}

@media (min-width: 960px) {
  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
    align-items: start;
    gap: clamp(1.5rem, 4vw, 2.75rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-bar,
  .page-about .audit-step {
    transition: none;
  }

  .page-about .about-bar:hover,
  .page-about .about-bar:focus-within {
    transform: none;
  }
}