:root {
  --font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

body {
  font-family: var(--font-family);
}

.icon {
  width: 1em;
  height: 1em;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  display: inline-block;
  vertical-align: -0.15em;
  flex-shrink: 0;
}

.icon-fill {
  fill: currentColor;
  stroke: none;
}

.hamburger .icon-close { display: none; }
.hamburger[aria-expanded="true"] .icon-menu { display: none; }
.hamburger[aria-expanded="true"] .icon-close { display: inline-block; }

.faq-icon {
  transition: transform 0.25s ease;
}
.faq-icon.open {
  transform: rotate(45deg);
}

.nav-active {
  color: #60a5fa !important;
}

.seo-scenarios-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.9rem;
  display: block;
  overflow-x: auto;
}
.seo-scenarios-table thead tr { background: rgba(59,130,246,.15); }
.seo-scenarios-table th {
  padding: 12px 16px;
  text-align: left;
  color: #00c8ff;
  font-weight: 600;
  border-bottom: 1px solid rgba(0,200,255,.2);
  white-space: nowrap;
}
.seo-scenarios-table td {
  padding: 12px 16px;
  color: #b0d4ff;
  border-bottom: 1px solid rgba(30,80,160,.3);
  vertical-align: top;
  line-height: 1.6;
}
.seo-scenarios-table tbody tr:hover { background: rgba(59,130,246,.07); }

.seo-features-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin: 24px 0;
}
@media (min-width: 768px) {
  .seo-features-list { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .seo-features-list { grid-template-columns: repeat(3, 1fr); }
}

.seo-feature-card {
  background: #0a1a38;
  border: 1px solid rgba(30,80,160,.4);
  border-radius: 10px;
  padding: 20px;
  transition: border-color .3s;
}
.seo-feature-card:hover { border-color: rgba(0,200,255,.4); }
.seo-feature-card h3 { color: #00c8ff; font-size: 1rem; margin: 0 0 10px; }
.seo-feature-card p { color: #b0d4ff; font-size: 0.875rem; line-height: 1.7; margin: 0; }
.seo-feature-card .feature-tag {
  display: inline-block;
  background: rgba(59,130,246,.15);
  color: #93c5fd;
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 20px;
  margin-top: 10px;
}

.seo-notice {
  background: rgba(59,130,246,.08);
  border: 1px solid rgba(59,130,246,.2);
  border-left: 3px solid #3b82f6;
  border-radius: 6px;
  padding: 12px 16px;
  margin: 16px 0;
  font-size: 0.8rem;
  color: #93c5fd;
  line-height: 1.6;
}

.latency-demo {
  background: linear-gradient(135deg, #0a1a38, #0f2440);
  border: 1px solid rgba(0,200,255,.15);
  border-radius: 12px;
  padding: 24px 32px;
  margin: 16px 0 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-around;
  gap: 16px;
}
.latency-demo .stat-item { text-align: center; padding: 8px 16px; }
.latency-demo .stat-item .number {
  font-size: 2rem;
  font-weight: 700;
  color: #00c8ff;
}
.latency-demo .stat-item .label { font-size: 0.8rem; color: #93c5fd; }
.latency-demo .stat-divider {
  width: 1px;
  height: 40px;
  background: rgba(0,200,255,.2);
}
@media (max-width: 576px) {
  .latency-demo .stat-divider { display: none; }
}

.text-link {
  color: #60a5fa;
  text-decoration: underline;
}

.page-header {
  padding: 120px 0 48px;
  text-align: center;
  background: linear-gradient(180deg, #040c1e, #021022);
}
.page-header h1 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  margin-bottom: 12px;
}
.page-header p {
  color: #93c5fd;
  max-width: 640px;
  margin: 0 auto;
}

.breadcrumb {
  padding: 16px 0;
  font-size: 0.85rem;
  color: #93c5fd;
}
.breadcrumb a { color: #60a5fa; }
.breadcrumb span { margin: 0 8px; }

.download-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin: 32px 0;
}
@media (min-width: 576px) {
  .download-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 992px) {
  .download-grid { grid-template-columns: repeat(3, 1fr); }
}

.download-card {
  background: #0a1a38;
  border: 1px solid rgba(30,80,160,.4);
  border-radius: 12px;
  padding: 28px 24px;
  text-align: center;
  transition: border-color .3s, transform .2s;
}
.download-card:hover {
  border-color: rgba(0,200,255,.4);
  transform: translateY(-2px);
}
.download-card .platform-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  color: #00c8ff;
}
.download-card h3 { color: #fff; margin-bottom: 8px; }
.download-card p { color: #93c5fd; font-size: 0.9rem; margin-bottom: 20px; }

.reviews-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin: 32px 0;
}
@media (min-width: 576px) {
  .reviews-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 992px) {
  .reviews-grid { grid-template-columns: repeat(3, 1fr); }
}

.review-card {
  background: #0a1a38;
  border: 1px solid rgba(30,80,160,.4);
  border-radius: 10px;
  padding: 24px;
}
.review-card blockquote {
  color: #fff;
  font-size: 0.9rem;
  line-height: 1.7;
  margin: 0 0 16px;
  font-style: italic;
  border-left: 3px solid #00c8ff;
  padding-left: 12px;
}
.review-card .review-user {
  display: flex;
  align-items: center;
  gap: 12px;
}
.review-card .review-user img {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
}
.review-card .review-name { font-weight: 600; font-size: 0.9rem; }
.review-card .review-role { color: #93c5fd; font-size: 0.8rem; }
.review-card .review-badge {
  margin-left: auto;
  background: rgba(0,200,255,.1);
  color: #00c8ff;
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 20px;
}

.post-content {
  max-width: 800px;
  margin: 0 auto;
  color: #b0d4ff;
  line-height: 1.8;
}
.post-content h2 {
  color: #00c8ff;
  margin: 32px 0 16px;
  font-size: 1.3rem;
}
.post-content p { margin-bottom: 16px; }
.post-meta { color: #93c5fd; font-size: 0.85rem; margin-bottom: 24px; }

.feature-detail {
  background: #0a1a38;
  border: 1px solid rgba(30,80,160,.4);
  border-radius: 12px;
  padding: 28px;
  margin-bottom: 24px;
}
.feature-detail h2 {
  color: #00c8ff;
  font-size: 1.2rem;
  margin-bottom: 12px;
}
.feature-detail p { color: #b0d4ff; line-height: 1.8; }