.page-about {
  --ab-rail-w: 208px;
  --ab-block-gap: clamp(52px, 7vw, 96px);
  display: block;
  padding-bottom: clamp(24px, 4vw, 56px);
}

.page-about .breadcrumb {
  padding: 18px 0 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--stone);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .breadcrumb li {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  color: var(--edge);
}

.page-about .breadcrumb a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color 0.15s ease;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  border-bottom-color: var(--cyan);
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  margin-top: 16px;
  padding: clamp(30px, 5vw, 62px) 0 clamp(36px, 6vw, 76px);
  border-top: 2px solid var(--edge);
  border-bottom: 2px solid var(--edge);
  background:
    radial-gradient(92% 84% at 88% 0%, var(--cyan-16) 0%, transparent 62%),
    linear-gradient(180deg, var(--panel-2) 0%, var(--ink) 100%);
  overflow: hidden;
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  align-items: center;
}

.page-about .hero-copy {
  min-width: 0;
}

.page-about .section-kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .hero-copy h1 {
  margin: 0;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(29px, 5.2vw, 56px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--cream);
}

.page-about .hero-lead {
  margin: 20px 0 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--stone);
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 28px 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 2px solid var(--edge);
}

.page-about .hero-facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .hf-num {
  font-family: var(--font-mono);
  font-size: clamp(21px, 3vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  letter-spacing: -0.01em;
}

.page-about .hero-facts li:nth-child(2) .hf-num {
  color: var(--cyan);
}

.page-about .hf-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--stone);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .hero-visual {
  margin: 0;
  border: 2px solid var(--edge);
  background: var(--panel-2);
  box-shadow: var(--shadow-hard);
}

.page-about .hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 主布局：索引轨道 + 内容列 ---------- */

.page-about .about-layout {
  display: grid;
  gap: 32px;
  padding-top: var(--ab-block-gap);
}

.page-about .about-rail {
  align-self: start;
  min-width: 0;
}

.page-about .rail-kicker {
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--edge);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--stone);
}

.page-about .rail-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .rail-list li {
  flex: 0 0 auto;
}

.page-about .rail-list a {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 12px;
  font-size: 14px;
  color: var(--stone);
  text-decoration: none;
  white-space: nowrap;
  background: var(--panel-2);
  border: 2px solid var(--edge);
  transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}

.page-about .rail-list a:hover,
.page-about .rail-list a:focus-visible {
  color: var(--cream);
  background: var(--cyan-08);
  border-color: var(--cyan);
}

.page-about .rail-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--orange);
}

.page-about .about-body {
  display: grid;
  gap: var(--ab-block-gap);
  min-width: 0;
}

.page-about .about-block {
  min-width: 0;
  scroll-margin-top: 108px;
}

.page-about .section-head {
  margin-bottom: clamp(24px, 3vw, 38px);
}

.page-about .section-title {
  margin: 0;
  max-width: 24ch;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 3.3vw, 35px);
  line-height: 1.28;
  color: var(--cream);
}

.page-about .section-lead {
  margin: 14px 0 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.82;
  color: var(--stone);
}

/* ---------- 01 团队构成条形图 ---------- */

.page-about .crew-compose {
  margin-bottom: clamp(22px, 3vw, 32px);
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--panel-2);
  border: 2px solid var(--edge);
}

.page-about .compose-label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--stone);
}

.page-about .compose-bar {
  display: flex;
  gap: 4px;
  height: 44px;
  border: 2px solid var(--edge);
  background: var(--ink-deep);
  padding: 3px;
}

.page-about .seg {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  transition: filter 0.15s ease;
}

.page-about .seg:hover {
  filter: brightness(1.25);
}

.page-about .seg-a {
  flex: 11 1 0;
  background: var(--cyan);
}

.page-about .seg-b {
  flex: 10 1 0;
  background: #1FA9A4;
}

.page-about .seg-c {
  flex: 9 1 0;
  background: var(--orange);
}

.page-about .seg-d {
  flex: 8 1 0;
  background: var(--clay);
}

.page-about .seg-text {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-deep);
}

.page-about .compose-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--stone);
}

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

.page-about .dot {
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
  border: 2px solid var(--edge);
}

.page-about .dot-a {
  background: var(--cyan);
}

.page-about .dot-b {
  background: #1FA9A4;
}

.page-about .dot-c {
  background: var(--orange);
}

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

.page-about .crew-stack {
  display: grid;
  gap: 14px;
}

.page-about .crew-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px 18px;
  align-items: start;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--panel);
  border: 2px solid var(--edge);
  border-left: 4px solid var(--cyan);
  box-shadow: var(--shadow-hard);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-left-color 0.15s ease;
}

.page-about .crew-row:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lift);
  border-left-color: var(--orange);
}

.page-about .crew-idx {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--orange);
  padding-top: 4px;
}

.page-about .crew-text {
  min-width: 0;
}

.page-about .crew-name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.3;
  color: var(--cream);
}

.page-about .crew-text p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

.page-about .crew-meta {
  grid-column: 1 / -1;
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 0;
  padding-top: 12px;
  border-top: 2px solid var(--edge-soft);
  font-family: var(--font-mono);
}

.page-about .crew-num {
  font-size: 22px;
  font-weight: 700;
  color: var(--cream);
  line-height: 1;
}

.page-about .crew-unit {
  font-size: 12px;
  color: var(--stone);
}

/* ---------- 02 版本时间线 ---------- */

.page-about .version-wrap {
  display: grid;
  gap: clamp(26px, 3.4vw, 44px);
}

.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 34px;
  list-style: none;
  display: grid;
  gap: 18px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 22px;
  bottom: 22px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--edge) 100%);
}

.page-about .tl-item {
  position: relative;
  min-width: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 20px;
  width: 16px;
  height: 16px;
  background: var(--ink);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px var(--ink);
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.page-about .tl-item.is-current::before {
  background: var(--orange);
  border-color: var(--orange);
}

.page-about .tl-item:hover::before {
  background: var(--cyan);
}

.page-about .tl-card {
  padding: 16px 18px 18px;
  background: var(--panel-2);
  border: 2px solid var(--edge);
  transition: border-color 0.15s ease, background-color 0.15s ease, transform 0.15s ease;
}

.page-about .tl-item:hover .tl-card,
.page-about .tl-item:focus-within .tl-card {
  transform: translateY(-2px);
  border-color: var(--cyan);
  background: var(--panel);
}

.page-about .tl-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.page-about .tl-ver {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--orange);
}

.page-about .tl-item.is-current .tl-ver {
  color: var(--cyan);
}

.page-about .tl-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.35;
  color: var(--cream);
}

.page-about .tl-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--stone);
}

.page-about .version-visual {
  margin: 0;
  border: 2px solid var(--edge);
  background: var(--panel-2);
  box-shadow: var(--shadow-hard);
}

.page-about .version-visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media-caption {
  margin: 0;
  padding: 12px 16px;
  border-top: 2px solid var(--edge);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--stone);
}

/* ---------- 03 更新节奏 ---------- */

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

.page-about .cadence-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2.2vw, 24px);
  background: var(--panel);
  border: 2px solid var(--edge);
  border-top: 4px solid var(--edge);
  transition: border-top-color 0.15s ease, transform 0.15s ease;
}

.page-about .cadence-card:hover {
  transform: translateY(-2px);
  border-top-color: var(--cyan);
}

.page-about .cadence-card.is-lead {
  border-top-color: var(--orange);
  background: linear-gradient(158deg, var(--panel) 0%, var(--panel-2) 100%);
  box-shadow: var(--shadow-hard);
}

.page-about .cadence-when {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .cadence-card.is-lead .cadence-when {
  color: var(--orange);
  font-size: 14px;
}

.page-about .cadence-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.35;
  color: var(--cream);
}

.page-about .cadence-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--stone);
}

/* ---------- 横向节拍带 ---------- */

.page-about .section-band {
  border: 2px solid var(--edge);
  border-left: 6px solid var(--orange);
  background:
    linear-gradient(100deg, var(--cyan-08) 0%, transparent 58%),
    var(--panel-2);
}

.page-about .band-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: clamp(18px, 2.6vw, 26px) clamp(18px, 2.6vw, 30px);
}

.page-about .band-line {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--cream);
  max-width: 46ch;
}

.page-about .band-tail {
  border-left-color: var(--cyan);
}

/* ---------- 04 覆盖范围 ---------- */

.page-about .kpi-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: clamp(24px, 3vw, 36px);
}

.page-about .kpi {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(16px, 2.2vw, 22px);
  background: var(--panel);
  border: 2px solid var(--edge);
  min-width: 0;
}

.page-about .kpi-value {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.6vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .kpi-value.is-cyan {
  color: var(--cyan);
}

.page-about .kpi-label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--stone);
}

.page-about .coverage-wrap {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .coverage-visual {
  margin: 0;
  border: 2px solid var(--edge);
  background: var(--panel-2);
  box-shadow: var(--shadow-hard);
}

.page-about .coverage-visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .coverage-notes {
  min-width: 0;
}

.page-about .coverage-notes h3 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.35;
  color: var(--cream);
}

.page-about .domain-list {
  display: grid;
  gap: 2px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
  border: 2px solid var(--edge);
  background: var(--edge);
}

.page-about .domain-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 14px;
  background: var(--ink-deep);
  font-size: 14.5px;
  color: var(--cream);
}

.page-about .domain-idx {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .coverage-note-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--stone);
}

/* ---------- 05 上线流程 ---------- */

.page-about .flow {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: flow;
}

.page-about .flow-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: clamp(16px, 2.2vw, 22px);
  background: var(--panel-2);
  border: 2px solid var(--edge);
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.page-about .flow-step:hover {
  background: var(--panel);
  border-color: var(--cyan);
}

.page-about .flow-num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--orange);
  padding-top: 3px;
}

.page-about .flow-text {
  min-width: 0;
}

.page-about .flow-text h3 {
  margin: 0 0 7px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.35;
  color: var(--cream);
}

.page-about .flow-text p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 06 支持渠道 ---------- */

.page-about .support-grid {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .support-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--panel);
  border: 2px solid var(--edge);
  box-shadow: var(--shadow-hard);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.page-about .support-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lift);
}

.page-about .support-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.35;
  color: var(--cream);
}

.page-about .support-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

.page-about .support-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: clamp(20px, 2.8vw, 30px);
  background:
    radial-gradient(80% 120% at 100% 0%, var(--cyan-16) 0%, transparent 62%),
    var(--panel-2);
  border: 2px solid var(--edge);
  border-left: 6px solid var(--cyan);
}

.page-about .support-cta-text {
  min-width: 0;
  flex: 1 1 320px;
}

.page-about .support-cta-text h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.35;
  color: var(--cream);
}

.page-about .support-cta-text p {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .cadence-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .support-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .crew-row {
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .crew-meta {
    grid-column: auto;
    padding-top: 0;
    padding-left: 18px;
    border-top: 0;
    border-left: 2px solid var(--edge-soft);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  }

  .page-about .version-wrap {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
  }

  .page-about .coverage-wrap {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 60px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
  }

  .page-about .rail-list {
    display: grid;
    gap: 2px;
    overflow-x: visible;
    padding-bottom: 0;
  }

  .page-about .rail-list li {
    flex: 1 1 auto;
  }

  .page-about .rail-list a {
    border-color: transparent;
    border-left: 3px solid transparent;
    background: transparent;
    padding: 9px 10px;
    white-space: normal;
  }

  .page-about .rail-list a:hover,
  .page-about .rail-list a:focus-visible {
    border-color: var(--edge);
    border-left-color: var(--cyan);
  }

  .page-about .cadence-grid {
    grid-template-columns: 1.45fr 1fr 1fr 1fr;
  }

  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}