.page-about {
  --gold: #D4A017;
  --cornflower: #3498DB;
}

/* 面包屑辅助 */
.page-about .crumb-sep {
  margin: 0 6px;
  color: var(--muted);
  font-family: var(--font-num);
}

/* 首屏 hero */
.page-about .about-hero {
  padding: 40px 0 28px;
  background: linear-gradient(135deg, #0D0D0D 0%, #1A1A1A 60%, #2C3E50 140%);
  border-bottom: 3px solid var(--violet);
  position: relative;
  overflow: hidden;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -40px;
  right: -40px;
  width: 160px;
  height: 160px;
  background: repeating-linear-gradient(45deg, rgba(230,126,34,.18) 0 12px, transparent 12px 24px);
  transform: rotate(8deg);
  pointer-events: none;
}
.page-about .about-hero-grid {
  display: grid;
  gap: 24px;
}
.page-about .about-hero-copy .hero-title {
  font-size: clamp(2rem, 6vw, 3.2rem);
  color: var(--white);
  text-shadow: 0 0 18px rgba(155,89,182,.85);
  margin: 6px 0 12px;
  text-transform: uppercase;
}
.page-about .about-lead {
  font-size: 1.02rem;
  color: var(--muted);
  line-height: 1.8;
  max-width: 60ch;
  margin: 0 0 18px;
}
.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* 统计卡 */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.page-about .stat-cell {
  background: var(--panel);
  padding: 18px 10px;
  display: grid;
  place-items: center;
  text-align: center;
  border: 1px solid var(--line);
  position: relative;
}
.page-about .stat-cell--orange { border-top: 4px solid var(--primary); }
.page-about .stat-cell--teal { border-top: 4px solid var(--teal); }
.page-about .stat-cell--violet { border-top: 4px solid var(--violet); }
.page-about .stat-cell-num {
  font-family: var(--font-num);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--white);
  line-height: 1.1;
}
.page-about .stat-cell--orange .stat-cell-num { color: var(--primary); text-shadow: 0 0 12px rgba(230,126,34,.6); }
.page-about .stat-cell--teal .stat-cell-num { color: var(--teal); text-shadow: 0 0 12px rgba(26,188,156,.6); }
.page-about .stat-cell--violet .stat-cell-num { color: var(--violet); text-shadow: 0 0 12px rgba(155,89,182,.6); }
.page-about .stat-cell-label {
  font-size: .78rem;
  color: var(--muted);
  margin-top: 4px;
}

/* 定位点 */
.page-about .position-points {
  display: grid;
  gap: 12px;
  margin-top: 28px;
}
.page-about .position-point {
  background: rgba(255,255,255,.04);
  border: 1px solid var(--line);
  padding: 16px;
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 4px 14px;
  align-items: start;
  border-left: 3px solid var(--teal);
}
.page-about .position-point:nth-child(2) { border-left-color: var(--primary); }
.page-about .position-point:nth-child(3) { border-left-color: var(--magenta); }
.page-about .position-point:nth-child(4) { border-left-color: var(--violet); }
.page-about .position-point-icon {
  font-size: 1.5rem;
  line-height: 1;
  grid-row: span 2;
  text-align: center;
  margin-top: 4px;
  color: var(--teal);
}
.page-about .position-point:nth-child(2) .position-point-icon { color: var(--primary); }
.page-about .position-point:nth-child(3) .position-point-icon { color: var(--magenta); }
.page-about .position-point:nth-child(4) .position-point-icon { color: var(--violet); }
.page-about .position-point-title {
  font-size: 1.05rem;
  font-weight: 900;
  letter-spacing: .5px;
  margin: 0;
  color: var(--white);
}
.page-about .position-point-text {
  margin: 0;
  font-size: .9rem;
  color: var(--muted);
  line-height: 1.65;
}

/* 通用 section */
.page-about .about-section { padding: 56px 0; }
.page-about .about-section--blue { background: var(--bg-blue); }
.page-about .about-section--deep { background: var(--bg-deep); }
.page-about .about-section .section-title {
  color: var(--white);
  font-size: 1.65rem;
  text-shadow: 0 0 10px currentColor;
}
.page-about .section-desc {
  color: var(--muted);
  font-size: .95rem;
  line-height: 1.7;
  max-width: 72ch;
  margin: -8px 0 26px;
}
.page-about .section-kicker { color: var(--teal); }
.page-about .about-section--blue .section-kicker { color: var(--yellow); }
.page-about .about-section--deep .section-kicker { color: var(--magenta); }

/* 维度区块 */
.page-about .dimension-grid {
  display: grid;
  gap: 28px;
}
.page-about .dimension-subhead {
  font-size: .85rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--yellow);
  margin: 0 0 14px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--line);
}
.page-about .dimension-subhead--sub { margin-top: 24px; }

.page-about .region-list { display: grid; gap: 12px; }
.page-about .region-row {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas: "name nums" "track track";
  gap: 6px 10px;
  align-items: center;
  font-family: var(--font-num);
}
.page-about .region-name {
  grid-area: name;
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: .5px;
  color: var(--white);
  font-size: .92rem;
}
.page-about .region-nums {
  grid-area: nums;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: baseline;
  justify-content: flex-end;
}
.page-about .region-num {
  font-weight: 700;
  color: var(--white);
  font-size: 1rem;
}
.page-about .region-sub {
  color: var(--archive);
  font-size: .7rem;
  font-family: var(--font-body);
}
.page-about .region-track {
  grid-area: track;
  height: 12px;
  background: rgba(255,255,255,.08);
  border-radius: 6px;
  overflow: hidden;
  display: block;
}
.page-about .region-bar {
  display: block;
  height: 100%;
  border-radius: 6px;
}
.page-about .region-bar--orange { background: var(--primary); box-shadow: 0 0 8px rgba(230,126,34,.6); }
.page-about .region-bar--yellow { background: var(--yellow); }
.page-about .region-bar--teal { background: var(--teal); }
.page-about .region-bar--magenta { background: var(--magenta); }
.page-about .region-bar--violet { background: var(--violet); }
.page-about .region-bar--cornflower { background: var(--cornflower); }
.page-about .region-bar--grey { background: var(--archive); }
.page-about .region-bar--gold { background: var(--gold); }

/* 类型与参数标签 */
.page-about .type-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.page-about .type-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 8px;
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: 1px;
  color: #fff;
  background: var(--panel);
  border: 1px solid var(--line);
  border-bottom-width: 3px;
  text-align: center;
  transition: transform .15s ease, box-shadow .15s ease;
}
.page-about .type-chip:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(0,0,0,.35);
}
.page-about .type-chip--orange { border-bottom-color: var(--primary); color: #FFE0C2; }
.page-about .type-chip--magenta { border-bottom-color: var(--magenta); color: #FFC4D8; }
.page-about .type-chip--teal { border-bottom-color: var(--teal); color: #BFF3EA; }
.page-about .type-chip--violet { border-bottom-color: var(--violet); color: #E1C9F3; }
.page-about .type-chip--yellow { border-bottom-color: var(--yellow); color: #FFF3C4; }
.page-about .type-chip--cornflower { border-bottom-color: var(--cornflower); color: #C4E0FF; }
.page-about .type-grid--sm .type-chip {
  padding: 8px 6px;
  font-size: .82rem;
}
.page-about .dimension-note {
  color: var(--muted);
  font-size: .88rem;
  line-height: 1.7;
  margin: 18px 0 0;
  padding: 12px 14px;
  background: rgba(255,255,255,.06);
  border-left: 3px solid var(--yellow);
}

/* 图占位 */
.page-about .about-figure {
  margin: 32px 0 0;
  padding: 0;
}
.page-about .about-figure-img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--panel);
}
.page-about .about-figcaption {
  color: var(--muted);
  font-size: .8rem;
  margin-top: 10px;
  text-align: center;
  letter-spacing: .3px;
}

/* 更新时间轴 */
.page-about .update-timeline {
  display: grid;
  gap: 0;
  position: relative;
  margin-top: 10px;
}
.page-about .update-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 20px;
  bottom: 20px;
  width: 2px;
  background: linear-gradient(to bottom, var(--live), var(--teal), var(--primary), var(--violet));
}
.page-about .tl-row {
  display: grid;
  grid-template-columns: 20px 1fr;
  gap: 18px;
  padding-bottom: 22px;
  position: relative;
  align-items: flex-start;
}
.page-about .tl-row:last-child { padding-bottom: 0; }
.page-about .tl-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  margin-top: 18px;
  border: 3px solid var(--bg-deep);
  box-shadow: 0 0 0 2px currentColor;
  background: currentColor;
}
.page-about .tl-dot--live { color: var(--live); }
.page-about .tl-dot--teal { color: var(--teal); }
.page-about .tl-dot--orange { color: var(--primary); }
.page-about .tl-dot--violet { color: var(--violet); }
.page-about .tl-card {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 18px;
}
.page-about .tl-card h3 {
  margin: 10px 0 6px;
  font-size: 1.05rem;
  color: var(--white);
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: .5px;
}
.page-about .tl-card p {
  margin: 0;
  color: var(--muted);
  font-size: .9rem;
  line-height: 1.7;
}
.page-about .tl-card--live { border-left: 4px solid var(--live); }
.page-about .tl-card--teal { border-left: 4px solid var(--teal); }
.page-about .tl-card--orange { border-left: 4px solid var(--primary); }
.page-about .tl-card--violet { border-left: 4px solid var(--violet); }

/* 设备卡片 */
.page-about .device-grid {
  display: grid;
  gap: 20px;
}
.page-about .device-card {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 22px 20px;
}
.page-about .device-card--tv {
  background: linear-gradient(135deg, #1E1E1E, #2C3E50);
}
.page-about .device-card-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}
.page-about .device-card-head h3 {
  margin: 0;
  font-size: 1.2rem;
  color: var(--white);
  font-weight: 900;
}
.page-about .device-icon {
  display: inline-flex;
  width: 44px;
  height: 32px;
  color: var(--teal);
  flex-shrink: 0;
}
.page-about .device-card--tv .device-icon { color: var(--primary); }
.page-about .device-icon svg {
  width: 100%;
  height: 100%;
}
.page-about .device-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.page-about .device-list li {
  position: relative;
  padding-left: 16px;
  color: var(--muted);
  font-size: .92rem;
  line-height: 1.6;
}
.page-about .device-list li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--teal);
}
.page-about .device-card--tv .device-list li::before { color: var(--primary); }

/* 页尾导航 */
.page-about .about-footer-nav {
  padding: 44px 0;
  background: var(--bg-deep);
  border-top: 2px solid var(--line);
}
.page-about .about-footer-nav .container {
  display: grid;
  gap: 14px;
}
.page-about .about-footer-link {
  display: block;
  text-decoration: none;
  padding: 18px 20px;
  border: 1px solid var(--line);
  background: var(--panel);
  transition: transform .15s ease, border-color .15s ease;
}
.page-about .about-footer-link:hover {
  transform: translateY(-2px);
  border-color: var(--line);
}
.page-about .about-footer-link--channels { border-left: 4px solid var(--primary); }
.page-about .about-footer-link--latest { border-left: 4px solid var(--magenta); }
.page-about .about-footer-link--faq { border-left: 4px solid var(--teal); }
.page-about .about-footer-link-title {
  display: block;
  color: var(--white);
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: 1px;
  font-size: 1.05rem;
}
.page-about .about-footer-link-desc {
  display: block;
  color: var(--muted);
  font-size: .85rem;
  margin-top: 4px;
}

/* 移动端增强 */
@media (min-width: 480px) {
  .page-about .stat-cell-num { font-size: 1.8rem; }
  .page-about .about-hero { padding: 52px 0 36px; }
}

/* 桌面端 */
@media (min-width: 768px) {
  .page-about .about-hero { padding: 60px 0 40px; }
  .page-about .about-hero-grid {
    grid-template-columns: 1.2fr .8fr;
    gap: 40px;
    align-items: center;
  }
  .page-about .position-points {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }
  .page-about .position-point {
    grid-template-columns: 1fr;
    padding: 20px;
  }
  .page-about .position-point-icon {
    grid-row: auto;
    text-align: left;
    margin-bottom: 8px;
    font-size: 1.8rem;
  }
  .page-about .about-section { padding: 72px 0; }
  .page-about .dimension-grid {
    grid-template-columns: 1.15fr .85fr;
    gap: 40px;
    align-items: start;
  }
  .page-about .region-row {
    grid-template-columns: 70px 1fr auto;
    grid-template-areas: "name track nums";
  }
  .page-about .type-grid { grid-template-columns: repeat(2, 1fr); }
  .page-about .device-grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
  .page-about .about-figure {
    max-width: 640px;
    margin-inline: auto;
  }
  .page-about .about-figure--wide { max-width: 760px; }
  .page-about .about-footer-nav .container {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }
  .page-about .update-timeline::before { left: 11px; }
  .page-about .tl-row { grid-template-columns: 24px 1fr; }
}