.page-about {
  --about-side: 320px;
  --about-rule: var(--line-soft);
  display: block;
}

/* ---------- 索引行 ---------- */
.page-about .about-index {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}
.page-about .about-index-num {
  color: var(--cyan);
  font-size: 13px;
}
.page-about .about-index-num::after {
  content: "";
  display: inline-block;
  width: 48px;
  height: 1px;
  margin-left: 12px;
  vertical-align: middle;
  background: linear-gradient(90deg, var(--cyan), rgba(79, 227, 208, 0));
}
.page-about .about-index-label {
  text-transform: uppercase;
  letter-spacing: 0.18em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(28px, 5vw, 64px) clamp(48px, 8vw, 104px);
  overflow: hidden;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(34, 48, 90, 0.38) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(34, 48, 90, 0.38) 1px, transparent 1px);
  background-size: var(--grid) var(--grid);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 18% 0%, #000 0%, transparent 72%);
  mask-image: radial-gradient(ellipse 90% 70% at 18% 0%, #000 0%, transparent 72%);
}
.page-about .about-hero .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-split {
  display: grid;
  gap: 40px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-title {
  margin: 20px 0 0;
  font-size: clamp(2.05rem, 7.4vw, 4.2rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--text);
  max-width: 15ch;
}
.page-about .about-lede {
  margin: 24px 0 0;
  max-width: 46ch;
  font-size: clamp(1rem, 2.3vw, 1.125rem);
  line-height: 1.85;
  color: var(--text-soft);
}
.page-about .about-lede--tight {
  margin-top: 18px;
  max-width: 52ch;
  font-size: 1rem;
  color: var(--muted);
}
.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

/* ---------- 首屏侧栏 ---------- */
.page-about .about-side {
  display: grid;
  gap: 18px;
  align-content: start;
  min-width: 0;
}
.page-about .about-side-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--ink-800);
  padding: 24px 22px 18px;
}
.page-about .about-side-title {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}
.page-about .about-side-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-side-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 2px;
  border-bottom: 1px solid var(--line-soft);
  color: var(--text);
  text-decoration: none;
  font-size: 0.9375rem;
  transition: color 0.22s ease, padding-left 0.22s ease;
}
.page-about .about-side-link:hover,
.page-about .about-side-link:focus-visible {
  color: var(--cyan-soft);
  padding-left: 10px;
}
.page-about .about-side-link .mono {
  color: var(--muted);
  font-size: 12px;
}
.page-about .about-side-list li:last-child .about-side-link {
  border-bottom: none;
}
.page-about .about-side-note {
  margin: 14px 0 0;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted);
}

/* ---------- 数据侧栏 ---------- */
.page-about .about-side--facts {
  gap: 16px;
}
.page-about .about-fact {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(150deg, var(--ink-800), var(--ink-900));
  padding: 22px 22px 20px;
}
.page-about .about-fact-num {
  font-size: 2.25rem;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.03em;
}
.page-about .about-fact-unit {
  margin-left: 8px;
  font-size: 0.875rem;
  color: var(--text-soft);
}
.page-about .about-fact-note {
  margin: 12px 0 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 常规区块 ---------- */
.page-about .about-section {
  padding-block: clamp(56px, 9vw, 104px);
  border-top: 1px solid var(--about-rule);
}
.page-about .about-section--timeline {
  background: linear-gradient(180deg, rgba(19, 28, 58, 0.55) 0%, rgba(10, 16, 36, 0) 55%);
}
.page-about .about-h2 {
  margin: 16px 0 0;
  font-size: clamp(1.55rem, 4.6vw, 2.5rem);
  line-height: 1.24;
  letter-spacing: -0.015em;
  font-weight: 800;
  color: var(--text);
  max-width: 22ch;
}
.page-about .about-copy {
  margin-top: 22px;
}
.page-about .about-copy p {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-soft);
}
.page-about .about-copy p:last-child {
  margin-bottom: 0;
}

/* ---------- 团队条形 ---------- */
.page-about .about-bars {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}
.page-about .about-bar {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--ink-800);
  padding: 22px 22px 20px;
  transition: border-color 0.25s ease, transform 0.25s ease;
}
.page-about .about-bar:hover,
.page-about .about-bar:focus-within {
  border-color: var(--cyan);
  transform: translateY(-2px);
}
.page-about .about-bar-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
}
.page-about .about-bar-name {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}
.page-about .about-bar-num {
  font-size: 1.75rem;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}
.page-about .about-bar-unit {
  margin-left: 4px;
  font-size: 0.8125rem;
  color: var(--muted);
}
.page-about .about-bar-track {
  margin-top: 16px;
  height: 6px;
  border-radius: var(--pill);
  background: var(--ink-850);
  overflow: hidden;
}
.page-about .about-bar-fill {
  display: block;
  height: 100%;
  width: var(--fill, 50%);
  border-radius: var(--pill);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--cyan), var(--cyan-soft));
}
.page-about .about-bar--dev {
  --fill: 60%;
}
.page-about .about-bar--content {
  --fill: 22%;
}
.page-about .about-bar--support {
  --fill: 18%;
}
.page-about .about-bar.is-visible .about-bar-fill {
  animation: about-grow 0.9s cubic-bezier(0.2, 0.7, 0.2, 1) both;
}
.page-about .about-bar-detail {
  margin: 14px 0 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--muted);
  transition: max-height 0.35s ease, opacity 0.3s ease, margin-top 0.3s ease;
}
.page-about .about-bar:hover .about-bar-detail,
.page-about .about-bar:focus-within .about-bar-detail {
  max-height: 200px;
  opacity: 1;
}
@keyframes about-grow {
  from {
    transform: scaleX(0);
  }
  to {
    transform: scaleX(1);
  }
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--ink-850);
  overflow: hidden;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-figure--doc img {
  aspect-ratio: 880 / 560;
}
.page-about .about-figure--badge img {
  aspect-ratio: 760 / 520;
}
.page-about .about-figure--wide img {
  aspect-ratio: 1000 / 620;
}
.page-about .about-figure--lead {
  margin-top: 36px;
}
.page-about .media-caption {
  display: block;
  padding: 14px 18px;
  border-top: 1px solid var(--line-soft);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 服务区块 ---------- */
.page-about .about-service-grid {
  display: grid;
  gap: 32px;
  grid-template-columns: minmax(0, 1fr);
  margin-top: 26px;
}
.page-about .about-service-copy {
  margin-top: 0;
}
.page-about .about-service-copy .btn {
  margin-top: 8px;
}
.page-about .about-caps {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.page-about .about-cap {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--ink-850);
  padding: 18px 16px;
  min-width: 0;
}
.page-about .about-cap-value {
  font-size: clamp(1.05rem, 3vw, 1.35rem);
  color: var(--cyan);
  letter-spacing: -0.01em;
  overflow-wrap: anywhere;
}
.page-about .about-cap-label {
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--muted);
}
.page-about .about-cap--warn {
  border-color: rgba(255, 138, 61, 0.45);
  background: linear-gradient(150deg, var(--orange-dim), var(--ink-850));
}
.page-about .about-cap--warn .about-cap-value {
  color: var(--orange);
}

/* ---------- 标签 ---------- */
.page-about .about-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 26px 0 0;
  padding: 0;
}
.page-about .about-tag {
  display: inline-flex;
  align-items: center;
  height: 28px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: var(--ink-850);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan-soft);
}
.page-about .about-tag--warm {
  border-color: rgba(255, 138, 61, 0.5);
  background: var(--orange-dim);
  color: var(--orange-soft);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 44px 0 0;
  padding: 0;
  counter-reset: none;
}
.page-about .about-mile {
  position: relative;
  padding: 0 0 44px 44px;
}
.page-about .about-mile::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 26px;
  bottom: 0;
  width: 1px;
  background: var(--line);
}
.page-about .about-mile:last-child {
  padding-bottom: 0;
}
.page-about .about-mile:last-child::before {
  display: none;
}
.page-about .about-node {
  position: absolute;
  left: 0;
  top: 4px;
  width: 21px;
  height: 21px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--ink-900);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.page-about .about-mile[data-state="active"] .about-node {
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 6px var(--cyan-dim);
}
.page-about .about-stage {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}
.page-about .about-mile[data-state="active"] .about-stage {
  color: var(--cyan-soft);
}
.page-about .about-mile-title {
  margin: 0;
  font-size: clamp(1.05rem, 3vw, 1.25rem);
  line-height: 1.45;
  font-weight: 700;
  color: var(--text);
}
.page-about .about-mile-text {
  margin: 12px 0 0;
  max-width: 58ch;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--text-soft);
}
.page-about .about-mile .accordion {
  margin-top: 16px;
}
.page-about .accordion-body ul {
  margin: 0;
  padding-left: 18px;
}
.page-about .accordion-body li {
  margin: 6px 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding-block: clamp(48px, 8vw, 96px);
}
.page-about .about-cta-panel {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: linear-gradient(160deg, var(--ink-800) 0%, var(--ink-900) 72%);
  padding: clamp(26px, 5vw, 52px);
}
.page-about .about-cta-panel::after {
  content: "";
  position: absolute;
  right: -80px;
  top: -80px;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  border: 1px solid rgba(79, 227, 208, 0.22);
  pointer-events: none;
}
.page-about .about-cta-lede {
  margin: 20px 0 0;
  max-width: 56ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-soft);
}
.page-about .about-cta-links {
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(0, 1fr);
  margin-top: 30px;
}
.page-about .about-cta-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 18px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(14, 22, 48, 0.7);
  text-decoration: none;
  transition: border-color 0.24s ease, transform 0.24s ease, background 0.24s ease;
}
.page-about .about-cta-link .mono {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.14em;
}
.page-about .about-cta-link-name {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}
.page-about .about-cta-link-note {
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--muted);
}
.page-about .about-cta-link:hover,
.page-about .about-cta-link:focus-visible {
  border-color: var(--cyan);
  background: rgba(19, 28, 58, 0.95);
  transform: translateY(-2px);
}
.page-about .about-cta-link:hover .about-cta-link-name {
  color: var(--cyan-soft);
}

/* ---------- 焦点可见性 ---------- */
.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: var(--radius-md);
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 720px) {
  .page-about .about-caps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-cta-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) var(--about-side);
    gap: 64px;
    align-items: start;
  }
  .page-about .about-service-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }
  .page-about .about-caps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-cta-links {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-mile {
    padding: 0 0 56px 132px;
  }
  .page-about .about-mile::before {
    left: 82px;
  }
  .page-about .about-node {
    left: 72px;
  }
  .page-about .about-stage {
    position: absolute;
    left: 0;
    top: 6px;
    width: auto;
    margin: 0;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: 0.24em;
  }
}

@media (min-width: 1240px) {
  .page-about .about-section {
    padding-block: clamp(72px, 8vw, 120px);
  }
}

/* ---------- 触屏与动效偏好 ---------- */
@media (hover: none) {
  .page-about .about-bar-detail {
    max-height: none;
    opacity: 1;
    overflow: visible;
  }
  .page-about .about-bar:hover {
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation: none !important;
    transition: none !important;
  }
  .page-about .about-bar-fill {
    transform: none;
  }
  .page-about .about-bar-detail {
    max-height: none;
    opacity: 1;
  }
  .page-about .about-bar:hover,
  .page-about .about-cta-link:hover {
    transform: none;
  }
}