.page-about {
  --about-copy: #d3e4df;
  --about-glow: rgba(0, 229, 168, 0.16);
  background: var(--ink);
  color: var(--text);
  overflow-x: clip;
}

/* 面包屑 */
.page-about .breadcrumbs {
  padding-block: 1rem 0.5rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--line);
}

.page-about .breadcrumbs a {
  color: var(--pulse);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--pulse-hi);
  text-decoration: underline;
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 100% 0%, var(--about-glow), transparent 62%),
    radial-gradient(80% 70% at 0% 100%, rgba(217, 255, 61, 0.06), transparent 60%),
    var(--ink);
}

.page-about .about-hero-grid {
  display: grid;
  gap: 2rem;
  padding-block: 1.5rem 3rem;
}

.page-about .about-hero h1 {
  font-family: var(--cond);
  font-weight: 900;
  font-size: clamp(2.1rem, 7.4vw, 4.25rem);
  line-height: 1.02;
  letter-spacing: -0.01em;
  margin: 0.65rem 0 1rem;
}

.page-about .about-hero .lede {
  max-width: 46ch;
  color: var(--about-copy);
  font-size: 1rem;
  line-height: 1.8;
  margin: 0;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.page-about .about-hero-media,
.page-about .about-principle-media,
.page-about .about-rail .media-frame {
  margin: 2rem 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--steel);
}

.page-about .about-rail .media-frame {
  margin-top: 0;
}

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

/* 首屏侧栏 */
.page-about .about-hero-side {
  position: relative;
  padding: 1.75rem 1.5rem 1.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(0, 229, 168, 0.09), rgba(210, 255, 240, 0.03));
  backdrop-filter: blur(6px);
  overflow: hidden;
}

.page-about .about-hero-side::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--pulse), var(--volt), transparent);
}

.page-about .about-scope {
  position: relative;
  width: 168px;
  height: 168px;
  margin: 0 auto 1.1rem;
  display: grid;
  place-items: center;
}

.page-about .about-scope-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1px solid rgba(0, 229, 168, 0.32);
}

.page-about .about-scope-ring--b {
  inset: 15%;
  border-color: rgba(0, 229, 168, 0.24);
}

.page-about .about-scope-ring--c {
  inset: 31%;
  border-color: rgba(217, 255, 61, 0.34);
  animation: about-ring 3.2s ease-in-out infinite;
}

.page-about .about-scope-core {
  font-family: var(--mono);
  font-size: 1.9rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--volt);
}

@keyframes about-ring {
  0%, 100% { transform: scale(1); opacity: 0.85; }
  50% { transform: scale(1.06); opacity: 1; }
}

.page-about .about-scope-caption {
  margin: 0 0 1.25rem;
  text-align: center;
  font-family: var(--cond);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.04em;
  color: var(--pulse-hi);
}

.page-about .about-hero-stats {
  list-style: none;
  margin: 0;
  padding: 1rem 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 0.7rem;
}

.page-about .about-hero-stats li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
}

.page-about .about-stat-value {
  font-family: var(--mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.02em;
}

.page-about .about-stat-label {
  font-size: 0.8125rem;
  color: var(--muted);
  text-align: right;
}

/* 章节外壳 */
.page-about .about-section {
  padding-block: 3.25rem;
  border-bottom: 1px solid var(--line);
}

.page-about .about-section--dark {
  background: var(--ink-2);
}

.page-about .about-head {
  position: relative;
  display: grid;
  gap: 0.5rem;
  margin-bottom: 2rem;
  padding-bottom: 1.1rem;
  border-bottom: 1px solid var(--line);
}

.page-about .about-head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 76px;
  height: 2px;
  background: linear-gradient(90deg, var(--pulse), transparent);
  transition: width 0.35s ease;
}

.page-about .about-section:hover .about-head::after {
  width: 160px;
}

.page-about .about-index {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--pulse);
}

.page-about .about-title {
  font-family: var(--cond);
  font-weight: 900;
  font-size: clamp(1.55rem, 4.8vw, 2.6rem);
  line-height: 1.12;
  margin: 0;
}

.page-about .about-sub {
  margin: 0;
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.6;
}

.page-about .about-lead {
  margin: 0;
  max-width: 64ch;
  color: var(--about-copy);
  font-size: 1rem;
  line-height: 1.8;
}

/* 双栏 */
.page-about .about-columns {
  display: grid;
  gap: 2rem;
}

.page-about .about-rail {
  border-left: 2px solid rgba(0, 229, 168, 0.35);
  padding-left: 1.15rem;
}

.page-about .about-rail-lead {
  font-family: var(--cond);
  font-weight: 700;
  font-size: 1.2rem;
  line-height: 1.35;
  margin: 0 0 1.25rem;
  color: var(--pulse-hi);
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.page-about .about-facts li {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.page-about .about-fact-num {
  font-family: var(--mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--volt);
}

.page-about .about-fact-label {
  font-size: 0.8125rem;
  color: var(--muted);
  line-height: 1.5;
}

.page-about .about-body p {
  margin: 0 0 1.1rem;
  color: var(--about-copy);
  font-size: 1rem;
  line-height: 1.85;
}

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

/* 横向主题带 */
.page-about .about-band {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-band-item {
  position: relative;
  display: grid;
  gap: 0.6rem;
  align-content: start;
  padding: 1.5rem 1.25rem;
  background: var(--ink);
  transition: background 0.25s ease;
}

.page-about .about-band-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--pulse), var(--volt));
  transition: width 0.35s ease;
}

.page-about .about-band-item:hover,
.page-about .about-band-item:focus-within {
  background: var(--steel);
}

.page-about .about-band-item:hover::before,
.page-about .about-band-item:focus-within::before {
  width: 100%;
}

.page-about .about-band-tag {
  justify-self: start;
}

.page-about .about-band-item h3 {
  margin: 0;
  font-family: var(--cond);
  font-weight: 900;
  font-size: 1.25rem;
  line-height: 1.25;
  color: var(--text);
}

.page-about .about-band-item p {
  margin: 0;
  color: var(--about-copy);
  font-size: 0.9375rem;
  line-height: 1.75;
}

/* 控制栏示意 */
.page-about .about-console {
  margin-top: 1.5rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(210, 255, 240, 0.05);
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-console:hover,
.page-about .about-console:focus-visible {
  outline: none;
  border-color: rgba(0, 229, 168, 0.55);
  box-shadow: 0 0 0 1px rgba(0, 229, 168, 0.22), 0 16px 34px -22px rgba(0, 229, 168, 0.75);
}

.page-about .about-console-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px dashed var(--line);
}

.page-about .about-console-brand {
  font-family: var(--cond);
  font-weight: 900;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  color: var(--text);
}

.page-about .about-console-status {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.22rem 0.6rem;
  border: 1px solid rgba(0, 229, 168, 0.4);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  color: var(--pulse-hi);
}

.page-about .about-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--pulse);
  box-shadow: 0 0 0 3px rgba(0, 229, 168, 0.16);
  animation: about-dot-pulse 2.4s ease-in-out infinite;
}

@keyframes about-dot-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.page-about .about-console-nav {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-left: auto;
}

.page-about .about-console-item {
  padding: 0.22rem 0.6rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-console-item.is-on {
  color: var(--volt);
  border-color: rgba(217, 255, 61, 0.4);
  background: rgba(217, 255, 61, 0.08);
}

.page-about .about-console:hover .about-console-item,
.page-about .about-console:focus-within .about-console-item {
  border-color: var(--line);
}

.page-about .about-console:hover .about-console-item.is-on,
.page-about .about-console:focus-within .about-console-item.is-on {
  border-color: rgba(217, 255, 61, 0.6);
}

.page-about .about-console-hint {
  margin: 0.85rem 0 0;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* 覆盖范围 */
.page-about .about-coverage {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-coverage li {
  display: grid;
  gap: 0.35rem;
  align-content: start;
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--pulse);
  border-radius: var(--radius);
  background: var(--steel);
}

.page-about .about-coverage-num {
  font-family: var(--mono);
  font-size: 1.9rem;
  font-weight: 700;
  line-height: 1;
  color: var(--volt);
}

.page-about .about-coverage-name {
  font-family: var(--cond);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
}

.page-about .about-coverage-desc {
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--muted);
  overflow-wrap: anywhere;
}

/* 版本时间轴 */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.75rem;
  border-left: 1px solid var(--line);
  display: grid;
  gap: 1.75rem;
}

.page-about .about-tl-item {
  position: relative;
  padding-top: 0.15rem;
  outline: none;
  border-radius: var(--radius);
}

.page-about .about-tl-node {
  position: absolute;
  left: -1.75rem;
  top: 0.5rem;
  width: 10px;
  height: 10px;
  margin-left: -5.5px;
  border-radius: 50%;
  background: var(--steel);
  border: 2px solid var(--pulse);
  transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-tl-item:hover .about-tl-node,
.page-about .about-tl-item:focus-visible .about-tl-node {
  background: var(--volt);
  border-color: var(--volt);
  box-shadow: 0 0 0 5px rgba(217, 255, 61, 0.16);
}

.page-about .about-tl-item:focus-visible {
  box-shadow: 0 0 0 1px var(--pulse);
}

.page-about .about-tl-ver {
  display: block;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--pulse);
  margin-bottom: 0.3rem;
}

.page-about .about-tl-title {
  margin: 0 0 0.35rem;
  font-family: var(--cond);
  font-weight: 900;
  font-size: 1.15rem;
  line-height: 1.25;
  color: var(--text);
}

.page-about .about-tl-desc {
  margin: 0;
  color: var(--about-copy);
  font-size: 0.9375rem;
  line-height: 1.75;
}

/* 团队 */
.page-about .about-team {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-team-item {
  background: var(--ink);
  padding: 1.4rem 1.25rem;
}

.page-about .about-team-key {
  display: block;
  margin-bottom: 0.55rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--cond);
  font-weight: 900;
  font-size: 1.2rem;
  color: var(--pulse-hi);
}

.page-about .about-team-item p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--about-copy);
}

/* 收束区 */
.page-about .about-section--cta {
  background:
    radial-gradient(90% 120% at 0% 0%, var(--about-glow), transparent 62%),
    var(--ink);
  border-bottom: none;
}

.page-about .about-cta-inner {
  display: grid;
  gap: 1rem;
  max-width: 64ch;
}

.page-about .about-value-list {
  list-style: none;
  margin: 0.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.page-about .about-value-list li {
  position: relative;
  padding-left: 1.4rem;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--about-copy);
}

.page-about .about-value-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 9px;
  height: 2px;
  background: var(--volt);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

/* 响应式 */
@media (min-width: 700px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

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

@media (min-width: 960px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 3.25rem;
    padding-block: 2.5rem 4.5rem;
    align-items: start;
  }

  .page-about .about-section {
    padding-block: 5rem;
  }

  .page-about .about-columns {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr);
    gap: 3.25rem;
  }

  .page-about .about-timeline {
    padding-left: 2.5rem;
  }

  .page-about .about-tl-node {
    left: -2.5rem;
  }
}

@media (min-width: 1080px) {
  .page-about .about-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-scope-ring--c,
  .page-about .about-dot {
    animation: none;
  }

  .page-about .about-band-item::before,
  .page-about .about-head::after,
  .page-about .about-console,
  .page-about .about-tl-node {
    transition: none;
  }
}