.page-about {
  position: relative;
  background: var(--bg-space);
  color: var(--text);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.page-about .muted {
  color: var(--muted);
}

/* ============ 面包屑 ============ */
.page-about .breadcrumb {
  padding-block: 88px 0;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .breadcrumb-link {
  color: var(--muted);
  text-decoration: none;
  transition: color 180ms var(--ease);
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--mint);
}

.page-about .breadcrumb-sep {
  color: var(--daiqing);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  padding-block: 20px 8px;
}

.page-about .hero-wrap {
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: 20px;
}

.page-about .hero-stage {
  position: relative;
  isolation: isolate;
  display: flex;
  align-items: flex-end;
  min-height: clamp(460px, 74vh, 660px);
  overflow: hidden;
  border-radius: var(--r-glass);
  background: var(--bg-panel);
}

.page-about .hero-img {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 38%;
  filter: saturate(0.82) contrast(1.06);
}

.page-about .hero-veil {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(120% 70% at 82% 12%, rgba(43, 227, 176, 0.1), transparent 62%),
    linear-gradient(180deg, rgba(5, 7, 12, 0.18) 0%, rgba(5, 7, 12, 0.42) 38%, rgba(5, 7, 12, 0.95) 92%);
}

.page-about .hero-stage::after {
  content: "";
  position: absolute;
  inset: 13px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: calc(var(--r-glass) - 6px);
  pointer-events: none;
}

.page-about .hero-copy {
  position: relative;
  width: 100%;
  padding: 28px 22px 30px;
}

.page-about .page-eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--liuli);
}

.page-about .hero-title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(2rem, 8.4vw, 4rem);
  line-height: 1.04;
  letter-spacing: 0.06em;
  color: var(--text);
  text-shadow: 0 2px 24px rgba(5, 7, 12, 0.6);
}

.page-about .page-lede {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.78;
  color: #CFD9E4;
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 20px;
  margin: 26px 0 0;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.page-about .hero-stat {
  display: flex;
  flex-direction: column-reverse;
  gap: 4px;
  margin: 0;
}

.page-about .hero-stat-value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--orange);
}

.page-about .hero-stat-label {
  margin: 0;
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

/* ============ 通用章节 ============ */
.page-about .section {
  padding-block: 56px;
}

.page-about .section-head {
  max-width: 62ch;
  margin-bottom: 32px;
}

.page-about .section-index {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.page-about .section-title {
  position: relative;
  margin: 0 0 14px;
  padding-bottom: 14px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.5rem, 5.2vw, 2.3rem);
  line-height: 1.16;
  letter-spacing: 0.045em;
  color: var(--text);
}

.page-about .section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 46px;
  height: 2px;
  background: var(--orange);
}

.page-about .section-note {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

/* ============ 起点 ============ */
.page-about .origin-grid {
  display: grid;
  gap: 32px;
}

.page-about .origin-main p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.82;
  color: #D6DEE8;
}

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

.page-about .origin-side {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  align-content: start;
}

.page-about .pull-figure {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 16px;
  background: var(--bg-panel);
  border: 1px solid var(--hair);
  border-left: 2px solid var(--daiqing);
  border-radius: var(--r-solid);
}

.page-about .pull-num {
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 7vw, 2.6rem);
  font-weight: 500;
  line-height: 1;
  color: var(--mint);
}

.page-about .pull-plus {
  font-size: 0.55em;
  margin-left: 2px;
  color: var(--orange);
}

.page-about .pull-label {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

/* ============ 团队 ============ */
.page-about .about-team {
  background: linear-gradient(180deg, transparent 0%, rgba(11, 17, 28, 0.5) 22%, rgba(11, 17, 28, 0.5) 78%, transparent 100%);
}

.page-about .team-lead {
  display: grid;
  gap: 24px;
  margin-bottom: 30px;
}

.page-about .team-figure {
  margin: 0;
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--r-solid);
  border: 1px solid var(--hair);
}

.page-about .team-figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .team-lead-copy p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: #D6DEE8;
}

.page-about .big-num-wrap {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 14px !important;
}

.page-about .big-num {
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(3.4rem, 16vw, 5.6rem);
  line-height: 0.86;
  letter-spacing: 0.02em;
  color: var(--text);
}

.page-about .big-num-unit {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .team-rail {
  margin-top: 4px;
}

.page-about .team-rail:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 4px;
  border-radius: var(--r-solid);
}

.page-about .team-track {
  display: flex;
  gap: 14px;
  padding-bottom: 16px;
}

.page-about .team-item {
  flex: 0 0 78%;
  max-width: 300px;
  padding: 22px 20px;
  background: var(--bg-panel);
  border: 1px solid var(--hair);
  border-top: 3px solid var(--daiqing);
  border-radius: var(--r-solid);
}

.page-about .team-item--data {
  border-top-color: var(--orange);
}

.page-about .team-item--edit {
  border-top-color: var(--mint);
}

.page-about .team-item--care {
  border-top-color: var(--liuli);
}

.page-about .team-num {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 500;
  line-height: 1;
  color: var(--text);
}

.page-about .team-name {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text);
}

.page-about .team-desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--muted);
}

/* ============ 版本时间轴 ============ */
.page-about .v-timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-left: 30px;
}

.page-about .v-timeline::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 7px;
  width: 1px;
  background: linear-gradient(180deg, var(--daiqing) 0%, var(--orange) 42%, var(--mint) 72%, var(--daiqing) 100%);
  opacity: 0.55;
}

.page-about .v-card {
  position: relative;
  background: var(--bg-panel);
  border: 1px solid var(--hair);
  border-radius: var(--r-solid);
  transition: border-color 200ms var(--ease);
}

.page-about .v-card::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 24px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 26, 0.14);
}

.page-about .v-card[open] {
  border-color: rgba(255, 107, 26, 0.36);
}

.page-about .v-card summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 18px 18px;
  list-style: none;
  cursor: pointer;
  min-height: 44px;
}

.page-about .v-card summary::-webkit-details-marker {
  display: none;
}

.page-about .v-card summary:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: -2px;
  border-radius: var(--r-solid);
}

.page-about .v-index {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--liuli);
}

.page-about .v-name {
  flex: 1 1 auto;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.5;
  color: var(--text);
}

.page-about .v-caret {
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  border-right: 1.5px solid var(--muted);
  border-bottom: 1.5px solid var(--muted);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform 220ms var(--ease), border-color 200ms var(--ease);
}

.page-about .v-card[open] .v-caret {
  transform: rotate(-135deg) translate(-2px, -2px);
  border-color: var(--orange);
}

.page-about .v-body {
  padding: 0 18px 20px;
}

.page-about .v-body p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.82;
  color: var(--muted);
}

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

.page-about .v-band {
  margin: 4px 0;
}

.page-about .v-band img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--r-solid);
  border: 1px solid var(--hair);
  filter: saturate(0.9) contrast(1.05);
}

/* ============ 跟队日常 ============ */
.page-about .day-grid {
  display: grid;
  gap: 14px;
}

.page-about .day-card {
  padding: 22px 20px;
  background: var(--glass);
  border: 1px solid var(--glass-edge);
  border-radius: var(--r-glass);
  backdrop-filter: blur(6px);
}

.page-about .day-tag {
  display: inline-block;
  margin: 0 0 12px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: var(--bg-space);
  background: var(--mint);
  border-radius: 999px;
}

.page-about .day-card--quiet .day-tag {
  background: var(--liuli);
}

.page-about .day-card--close .day-tag {
  background: var(--orange);
  color: var(--text);
}

.page-about .day-title {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--text);
}

.page-about .day-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .day-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ============ 运营 ============ */
.page-about .ops-grid {
  display: grid;
  gap: 30px;
}

.page-about .ops-copy p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.82;
  color: #D6DEE8;
}

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

.page-about .ops-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--hair);
}

.page-about .ops-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 0;
  border-bottom: 1px solid var(--hair);
}

.page-about .ops-key {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .ops-val {
  font-size: 14px;
  text-align: right;
  color: var(--text);
}

/* ============ 分隔带 ============ */
.page-about .about-band {
  height: 2px;
  margin-block: 6px 0;
  background: linear-gradient(90deg, transparent 0%, var(--daiqing) 18%, var(--orange) 50%, var(--daiqing) 82%, transparent 100%);
  opacity: 0.75;
}

/* ============ 承诺 ============ */
.page-about .pledge-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .pledge-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  padding: 20px 18px;
  background: var(--bg-panel);
  border: 1px solid var(--hair);
  border-radius: var(--r-solid);
  transition: border-color 200ms var(--ease), background-color 200ms var(--ease);
}

.page-about .pledge-item:hover,
.page-about .pledge-item:focus-within {
  border-color: rgba(43, 227, 176, 0.4);
  background: #0D1420;
}

.page-about .pledge-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
  padding-top: 3px;
}

.page-about .pledge-title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--text);
}

.page-about .pledge-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .pledge-foot {
  margin-top: 30px;
  padding-top: 24px;
  border-top: 1px solid var(--hair);
}

.page-about .pledge-foot p {
  margin: 0 0 18px;
  font-size: 13.5px;
  line-height: 1.78;
}

/* ============ 开关与状态 ============ */
.page-about a.btn,
.page-about a.btn-ghost,
.page-about a.btn-quiet {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  text-decoration: none;
}

/* ============ 平板 ============ */
@media (min-width: 700px) {
  .page-about .hero-copy {
    padding: 36px 40px 40px;
  }

  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px 28px;
  }

  .page-about .origin-side {
    gap: 16px;
  }

  .page-about .team-lead {
    grid-template-columns: 1.25fr 1fr;
    align-items: start;
    gap: 32px;
  }

  .page-about .day-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .ops-grid {
    grid-template-columns: 7fr 5fr;
    gap: 40px;
    align-items: start;
  }

  .page-about .team-item {
    flex-basis: 44%;
  }

  .page-about .pledge-item {
    grid-template-columns: 56px 1fr;
    padding: 24px 24px;
  }
}

/* ============ 桌面：时间轴交错 ============ */
@media (min-width: 900px) {
  .page-about .section {
    padding-block: 76px;
  }

  .page-about .origin-grid {
    grid-template-columns: 7fr 5fr;
    gap: 48px;
    align-items: start;
  }

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

  .page-about .v-timeline {
    padding-left: 0;
    gap: 30px;
  }

  .page-about .v-timeline::before {
    left: 50%;
    transform: translateX(-0.5px);
  }

  .page-about .v-card {
    width: calc(50% - 46px);
  }

  .page-about .v-card:nth-of-type(odd) {
    margin-right: auto;
    margin-left: 0;
  }

  .page-about .v-card:nth-of-type(even) {
    margin-left: auto;
    margin-right: 0;
  }

  .page-about .v-card:nth-of-type(odd)::before {
    left: auto;
    right: -48px;
  }

  .page-about .v-card:nth-of-type(even)::before {
    left: -48px;
  }

  .page-about .v-band {
    width: calc(50% - 46px);
    margin-left: auto;
    margin-right: 0;
  }

  .page-about .v-band img {
    aspect-ratio: 16 / 10;
  }

  .page-about .team-item {
    flex-basis: 30%;
    max-width: none;
  }

  .page-about .team-track {
    gap: 18px;
  }

  .page-about .pledge-list {
    gap: 14px;
  }

  .page-about .pledge-foot {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 40px;
  }

  .page-about .pledge-foot p {
    margin-bottom: 0;
    max-width: 52ch;
  }
}

/* ============ 动效降级 ============ */
@media (prefers-reduced-motion: reduce) {
  .page-about .v-caret,
  .page-about .v-card,
  .page-about .pledge-item,
  .page-about .breadcrumb-link {
    transition: none;
  }
}