.page-about {
  --about-line: #1E3A5F;
  --about-glow: rgba(0, 255, 170, 0.14);
  --about-card-bg: #11263C;
  --about-deep: #081420;
  --about-font-data: 'Roboto Mono', 'SFMono-Regular', Consolas, monospace;

  background:
    linear-gradient(180deg, transparent 0%, transparent 30%, rgba(0, 255, 170, 0.025) 50%, transparent 80%),
    var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  margin-bottom: 1rem;
}

.page-about .section {
  padding: 3rem 0;
}

.page-about .container {
  position: relative;
  z-index: 1;
}

.page-about .section__header {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 2rem;
}

.page-about .section__index {
  font-family: var(--about-font-data);
  font-size: 0.78rem;
  color: var(--color-accent);
  letter-spacing: 0.12em;
}

.page-about .section__title {
  font-family: var(--font-head);
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin: 0;
}

.page-about .section__lead {
  margin: 0;
  max-width: 60ch;
  color: var(--color-text-dim);
}

/* ===== 首屏 Hero ===== */
.page-about .about-hero {
  position: relative;
  padding: 2.5rem 0 3.5rem;
  border-bottom: 2px solid var(--color-border);
  background:
    radial-gradient(circle at 82% 20%, rgba(77, 159, 255, 0.2), transparent 44%),
    linear-gradient(145deg, #0D2240 0%, #0B1A2C 58%, #091624 100%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -4%;
  right: -14%;
  width: 60%;
  height: 150%;
  background: var(--about-glow);
  transform: skewX(-14deg);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2rem;
  align-items: center;
}

.page-about .about-hero__eyebrow {
  font-family: var(--about-font-data);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin: 0 0 12px;
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin: 0 0 16px;
}

.page-about .about-hero__lead {
  font-size: 1.12rem;
  line-height: 1.6;
  color: var(--color-text);
  font-weight: 600;
  margin: 0 0 14px;
}

.page-about .about-hero__desc {
  color: var(--color-text-dim);
  line-height: 1.8;
  margin: 0;
  max-width: 60ch;
}

.page-about .about-hero__stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-hero__stat {
  background: rgba(17, 38, 60, 0.76);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 14px 14px 12px;
  box-shadow: var(--shadow-hard);
}

.page-about .about-hero__num {
  display: block;
  font-family: var(--about-font-data);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.15;
}

.page-about .about-hero__unit {
  font-family: var(--about-font-data);
  font-size: 0.74rem;
  color: var(--color-text-dim);
}

.page-about .about-hero__label {
  display: block;
  margin-top: 6px;
  font-size: 0.8rem;
  color: var(--color-text-dim);
}

/* ===== 我们是谁 ===== */
.page-about .about-identity {
  position: relative;
}

.page-about .about-identity__grid {
  display: grid;
  gap: 18px;
}

.page-about .about-identity__card {
  background: var(--about-card-bg);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius);
  padding: 20px;
  transition: transform var(--ease), box-shadow var(--ease), border-color var(--ease);
}

.page-about .about-identity__card:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard);
  border-color: #2b5c8c;
}

.page-about .about-identity__card-title {
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin: 0 0 10px;
  color: var(--color-text);
}

.page-about .about-identity__card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--color-text-dim);
}

/* ===== 发展里程碑 ===== */
.page-about .about-timeline-section {
  background:
    linear-gradient(180deg, transparent 0%, rgba(17, 38, 60, 0.3) 100%);
}

.page-about .about-timeline-section__cover {
  margin: 2rem 0 3rem;
  background: var(--color-bg-alt);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

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

.page-about .about-timeline-section__cover figcaption {
  padding: 10px 14px;
  font-family: var(--about-font-data);
  font-size: 0.78rem;
  color: var(--color-text-dim);
  border-top: 1px solid var(--color-border);
}

.page-about .about-timeline {
  position: relative;
  max-width: 880px;
  margin: 0 auto;
}

.page-about .about-timeline__curve {
  display: none;
}

.page-about .about-milestone {
  position: relative;
  padding: 18px 0 18px 30px;
  border-left: 2px solid rgba(30, 58, 95, 0.7);
}

.page-about .about-milestone__node {
  position: absolute;
  left: -10px;
  top: 24px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow:
    0 0 0 4px rgba(0, 255, 170, 0.15),
    0 0 16px rgba(0, 255, 170, 0.35);
}

.page-about .about-milestone__node--dim {
  background: var(--color-chart-1);
  box-shadow: 0 0 0 4px rgba(77, 159, 255, 0.15);
}

.page-about .about-milestone__node--active {
  background: var(--color-alert);
  box-shadow: 0 0 0 4px rgba(255, 106, 0, 0.2), 0 0 18px rgba(255, 106, 0, 0.35);
}

.page-about .about-milestone__version {
  display: block;
  font-family: var(--about-font-data);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-accent);
}

.page-about .about-milestone__period {
  display: block;
  font-family: var(--about-font-data);
  font-size: 0.74rem;
  color: var(--color-text-dim);
  margin-top: 2px;
}

.page-about .about-milestone__title {
  margin: 0 0 8px;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-milestone__desc {
  margin: 0;
  color: var(--color-text-dim);
  line-height: 1.7;
  font-size: 0.9rem;
}

.page-about .about-milestone__details {
  margin-top: 12px;
  background: rgba(8, 20, 32, 0.55);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 10px 14px;
}

.page-about .about-milestone__details summary {
  cursor: pointer;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--about-font-data);
  font-size: 0.78rem;
  color: var(--color-text-dim);
  font-weight: 600;
}

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

.page-about .about-milestone__details summary::before {
  content: "+";
  color: var(--color-accent);
  font-weight: 700;
  font-size: 1rem;
}

.page-about .about-milestone__details[open] summary::before {
  content: "–";
}

.page-about .about-milestone__details ul {
  margin: 10px 0 0;
  padding-left: 18px;
  color: var(--color-text-dim);
  font-size: 0.86rem;
  line-height: 1.7;
}

.page-about .about-version-panel {
  margin-top: 3rem;
}

.page-about .about-version-table {
  border-top: 2px solid var(--color-border);
}

.page-about .about-version-table__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
  align-items: center;
  font-size: 0.85rem;
  color: var(--color-text-dim);
}

.page-about .about-version-table__row span:first-child {
  grid-column: 1 / -1;
}

.page-about .about-version-table__row--head {
  font-family: var(--about-font-data);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-dim);
}

.page-about .about-version-table__row--accent {
  background: rgba(0, 255, 170, 0.05);
}

.page-about .about-version-table__code {
  font-family: var(--about-font-data);
  font-weight: 700;
  color: var(--color-accent);
}

.page-about .panel__note {
  margin-top: 12px;
  font-size: 0.76rem;
  color: var(--color-text-dim);
}

.page-about .about-timeline__cta {
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}

.page-about .about-timeline__cta p {
  margin: 0;
  color: var(--color-text-dim);
  font-size: 0.9rem;
}

/* ===== 服务覆盖范围 ===== */
.page-about .about-coverage__map {
  display: grid;
  gap: 24px;
  margin: 2.5rem 0 1.5rem;
}

.page-about .about-coverage__map-figure {
  margin: 0;
  background: var(--color-bg-alt);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

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

.page-about .about-coverage__map-figure figcaption {
  padding: 10px 14px;
  font-family: var(--about-font-data);
  font-size: 0.76rem;
  color: var(--color-text-dim);
  border-top: 1px solid var(--color-border);
}

.page-about .about-coverage__map-panel {
  background: linear-gradient(160deg, #11263C, #0D1F33);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-hard);
}

.page-about .about-coverage__map-panel h3 {
  margin: 0 0 14px;
  font-family: var(--about-font-data);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
}

.page-about .about-coverage__map-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.page-about .about-coverage__map-list li {
  font-family: var(--about-font-data);
  font-size: 0.78rem;
  display: flex;
  justify-content: space-between;
  gap: 8px;
  border-bottom: 1px dashed rgba(30, 58, 95, 0.8);
  padding-bottom: 6px;
}

.page-about .about-coverage__map-list li span:first-child {
  color: var(--color-text);
}

.page-about .about-coverage__map-list li span:last-child {
  color: var(--color-text-dim);
}

.page-about .about-coverage__grid {
  display: grid;
  gap: 18px;
}

.page-about .about-league {
  position: relative;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 18px 16px;
  transition: transform var(--ease), box-shadow var(--ease), border-color var(--ease);
}

.page-about .about-league::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: var(--color-accent);
  opacity: 0.75;
  border-radius: var(--radius) 0 0 var(--radius);
}

.page-about .about-league:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard);
  border-color: #2B5C8C;
}

.page-about .about-league__name {
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.page-about .about-league__en {
  display: block;
  font-family: var(--about-font-data);
  font-size: 0.68rem;
  color: var(--color-text-dim);
  letter-spacing: 0.05em;
  margin-top: 2px;
}

.page-about .about-league .data-row {
  margin-top: 12px;
  display: flex;
  justify-content: space-between;
  font-family: var(--about-font-data);
  font-size: 0.82rem;
  color: var(--color-text-dim);
  border-bottom: 1px solid rgba(30, 58, 95, 0.6);
  padding-bottom: 8px;
}

.page-about .about-league .data-row__value {
  color: var(--color-accent);
  font-weight: 700;
}

.page-about .about-league__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.page-about .about-coverage__note {
  margin-top: 2rem;
  font-family: var(--about-font-data);
  font-size: 0.74rem;
  color: var(--color-text-dim);
}

/* ===== 设备同步理念 ===== */
.page-about .about-sync {
  background:
    linear-gradient(115deg, rgba(0, 255, 170, 0.04) 0%, transparent 40%),
    var(--color-bg);
}

.page-about .about-sync__content {
  display: grid;
  gap: 28px;
  margin-top: 2.5rem;
}

.page-about .about-sync__text p {
  margin: 0;
  color: var(--color-text-dim);
  line-height: 1.8;
  font-size: 0.92rem;
}

.page-about .about-sync__list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
}

.page-about .about-sync__list li {
  position: relative;
  padding: 10px 0 10px 22px;
  border-bottom: 1px solid rgba(30, 58, 95, 0.6);
  color: var(--color-text-dim);
  font-size: 0.88rem;
}

.page-about .about-sync__list li::before {
  content: "●";
  position: absolute;
  left: 0;
  top: 13px;
  font-size: 0.68rem;
  color: var(--color-accent);
}

.page-about .about-sync__steps {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-sync__steps li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  font-family: var(--about-font-data);
  font-size: 0.8rem;
  color: var(--color-text-dim);
  border-bottom: 1px dashed rgba(30, 58, 95, 0.8);
  padding-bottom: 10px;
}

.page-about .about-sync__step {
  color: var(--color-accent);
  font-weight: 700;
  white-space: nowrap;
}

/* ===== 品牌认证与信任 ===== */
.page-about .about-trust {
  background:
    radial-gradient(circle at 85% 30%, rgba(155, 93, 229, 0.12), transparent 46%),
    var(--color-bg-deep);
}

.page-about .about-trust__grid {
  display: grid;
  gap: 32px;
  align-items: center;
  margin-top: 2.5rem;
}

.page-about .about-trust__content {
  display: grid;
  gap: 18px;
}

.page-about .about-trust__card {
  background: rgba(17, 38, 60, 0.6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: none;
  transition: box-shadow var(--ease);
}

.page-about .about-trust__card:hover {
  box-shadow: var(--shadow-hard);
}

.page-about .about-trust__card h3 {
  margin: 0 0 8px;
  font-family: var(--about-font-data);
  font-size: 0.92rem;
  letter-spacing: 0.06em;
  color: var(--color-accent);
}

.page-about .about-trust__card p {
  margin: 0;
  color: var(--color-text-dim);
  font-size: 0.9rem;
  line-height: 1.7;
}

.page-about .about-trust__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-trust__contact {
  list-style: none;
  margin: 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--color-border);
  font-size: 0.85rem;
  color: var(--color-text-dim);
  display: grid;
  gap: 6px;
  line-height: 1.6;
}

.page-about .about-trust__badge-figure {
  margin: 0 auto;
  width: min(300px, 80vw);
}

.page-about .about-trust__badge {
  display: block;
  width: 100%;
  height: auto;
  border: 3px solid var(--color-accent);
  border-radius: 50%;
  box-shadow:
    0 0 28px rgba(0, 255, 170, 0.18),
    var(--shadow-hard);
}

.page-about .about-trust__badge-figure figcaption {
  margin-top: 10px;
  text-align: center;
  font-family: var(--about-font-data);
  font-size: 0.74rem;
  color: var(--color-text-dim);
}

/* ===== 下一步 ===== */
.page-about .about-next__banner {
  border: 2px solid var(--color-border);
  background: linear-gradient(145deg, #11263C, #0E1F33);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow-hard);
}

.page-about .about-next h2 {
  margin: 0 0 10px;
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.page-about .about-next p {
  margin: 0 auto;
  color: var(--color-text-dim);
  max-width: 46ch;
  font-size: 0.9rem;
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 22px;
}

/* ===== 平板与桌面增强 ===== */
@media (min-width: 640px) {
  .page-about .about-identity__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-next__banner {
    padding: 40px 32px;
  }
}

@media (min-width: 768px) {
  .page-about .breadcrumb {
    margin-bottom: 1.5rem;
  }

  .page-about .section {
    padding: 5rem 0;
  }

  .page-about .section__title {
    font-size: 2.4rem;
  }

  .page-about .section__header {
    margin-bottom: 2.8rem;
  }

  .page-about .about-hero {
    padding: 4rem 0 5rem;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.8fr) minmax(0, 1fr);
    gap: 3rem;
  }

  .page-about .about-hero__stats {
    gap: 14px;
  }

  .page-about .about-milestone {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 32px;
  }

  .page-about .about-milestone__side {
    text-align: right;
    padding-right: 12px;
  }

  .page-about .about-milestone__node {
    left: -10px;
    top: 26px;
  }

  .page-about .about-version-table__row {
    grid-template-columns: 0.7fr 1fr 1fr 2fr;
  }

  .page-about .about-version-table__row span:first-child {
    grid-column: auto;
  }

  .page-about .about-coverage__map {
    grid-template-columns: 1.4fr 1fr;
    align-items: center;
  }

  .page-about .about-sync__content {
    grid-template-columns: 1.2fr 1fr;
    align-items: start;
  }

  .page-about .about-trust__grid {
    grid-template-columns: 1.4fr 0.8fr;
  }
}

@media (min-width: 900px) {
  .page-about .about-timeline__curve {
    display: block;
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 46%;
    max-width: 380px;
    height: auto;
    opacity: 0.7;
    pointer-events: none;
    z-index: 0;
  }

  .page-about .about-milestone {
    position: relative;
    z-index: 1;
  }

  .page-about .about-timeline__cta {
    flex-direction: row;
    align-items: center;
    gap: 18px;
  }

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

@media (min-width: 1024px) {
  .page-about .about-hero__desc {
    font-size: 0.95rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
  }

  .page-about .about-league,
  .page-about .about-identity__card,
  .page-about .about-trust__card {
    transform: none !important;
  }
}