/* ============================================================
   深常乐-sdwan 营销网站 - 主样式表
   配色: 深色科技风 (#0a0e27 + #00d4ff + #ffffff)
   ============================================================ */

/* --- Reset & Base --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-primary: #0a0e27;
  --bg-secondary: #111640;
  --bg-card: #161b44;
  --bg-card-hover: #1c2255;
  --accent: #00d4ff;
  --accent-dim: rgba(0, 212, 255, 0.15);
  --accent-glow: rgba(0, 212, 255, 0.35);
  --text-primary: #ffffff;
  --text-secondary: #a0a8c0;
  --text-muted: #6a7090;
  --border: rgba(255, 255, 255, 0.08);
  --border-light: rgba(255, 255, 255, 0.15);
  --success: #00e676;
  --warning: #ffab00;
  --danger: #ff5252;
  --radius: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
  --nav-height: 72px;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: #66e5ff; }

img { max-width: 100%; display: block; }

ul { list-style: none; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Background Effects --- */
.bg-grid {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}

.bg-glow-1 {
  position: fixed;
  top: -200px; right: -200px;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.08) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
  border-radius: 50%;
}

.bg-glow-2 {
  position: fixed;
  bottom: -200px; left: -200px;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(0, 150, 255, 0.06) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
  border-radius: 50%;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: rgba(10, 14, 39, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.nav.scrolled {
  background: rgba(10, 14, 39, 0.95);
  border-bottom-color: var(--border-light);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.nav-logo .logo-icon {
  width: 32px; height: 32px;
  background: var(--accent);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--bg-primary);
  font-weight: 800;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  position: relative;
  padding: 4px 0;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 2px;
  background: var(--accent);
  transition: width var(--transition);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-cta {
  padding: 8px 20px;
  background: var(--accent);
  color: var(--bg-primary) !important;
  border-radius: 8px;
  font-weight: 600 !important;
  font-size: 0.85rem !important;
  transition: all var(--transition) !important;
}

.nav-cta:hover {
  background: #66e5ff;
  box-shadow: 0 0 20px var(--accent-glow);
}

.nav-cta::after { display: none !important; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  overflow: hidden;
}

#particles-canvas {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--accent-dim);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 28px;
  animation: fadeInUp 0.8s ease-out;
}

.hero-badge .badge-dot {
  width: 8px; height: 8px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse-dot 2s infinite;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -1px;
  margin-bottom: 20px;
  animation: fadeInUp 0.8s ease-out 0.1s both;
}

.hero h1 .highlight {
  background: linear-gradient(135deg, var(--accent), #60a5fa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 36px;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease-out 0.3s both;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-primary);
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
}

.btn-primary:hover {
  background: #66e5ff;
  box-shadow: 0 6px 30px rgba(0, 212, 255, 0.45);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-light);
}

.btn-outline:hover {
  border-color: var(--accent);
  background: var(--accent-dim);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 16px 40px;
  font-size: 1.05rem;
  border-radius: 12px;
}

.hero-stats {
  display: flex;
  gap: 48px;
  justify-content: center;
  margin-top: 60px;
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

.hero-stat {
  text-align: center;
}

.hero-stat .stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1.2;
}

.hero-stat .stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* --- Section Common --- */
.section {
  padding: 100px 0;
  position: relative;
  z-index: 1;
}

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 60px;
}

.section-center {
  text-align: center;
}

.section-center .section-subtitle {
  margin-left: auto;
  margin-right: auto;
}

/* --- Trusted By --- */
.trusted {
  padding: 40px 0 60px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.trusted-label {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.trusted-logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
  opacity: 0.5;
}

.trusted-logo {
  height: 28px;
  filter: brightness(0) invert(1);
  opacity: 0.5;
}

/* --- Feature Cards --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(0, 212, 255, 0.25);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.feature-card:hover::before { opacity: 1; }

.feature-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
  background: var(--accent-dim);
  color: var(--accent);
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- Capability Tabs --- */
.capability-section {
  background: var(--bg-secondary);
}

.tabs-nav {
  display: flex;
  gap: 4px;
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 4px;
  margin-bottom: 40px;
  max-width: 500px;
}

.tab-btn {
  flex: 1;
  padding: 10px 20px;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition);
}

.tab-btn:hover { color: var(--text-primary); }

.tab-btn.active {
  background: var(--accent);
  color: var(--bg-primary);
  font-weight: 600;
}

.tab-panel {
  display: none;
  animation: fadeIn 0.4s ease-out;
}

.tab-panel.active { display: block; }

.tab-content {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.tab-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  transition: all var(--transition);
}

.tab-item:hover {
  border-color: rgba(0, 212, 255, 0.3);
  background: var(--bg-card-hover);
}

.tab-item .tab-item-icon {
  font-size: 1.5rem;
  margin-bottom: 10px;
}

.tab-item h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.tab-item p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --- Solution Cards --- */
.solutions-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.solution-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
  transition: all var(--transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.solution-card:hover {
  border-color: rgba(0, 212, 255, 0.3);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.solution-card .solution-icon {
  font-size: 2.2rem;
  margin-bottom: 16px;
}

.solution-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.solution-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.solution-card .solution-arrow {
  position: absolute;
  top: 36px; right: 36px;
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--accent-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  transition: all var(--transition);
  opacity: 0;
  transform: translateX(-10px);
}

.solution-card:hover .solution-arrow {
  opacity: 1;
  transform: translateX(0);
}

/* --- Pricing Section --- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
  transition: all var(--transition);
  position: relative;
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.pricing-card.featured {
  border-color: var(--accent);
  background: var(--bg-card-hover);
  box-shadow: 0 0 30px rgba(0, 212, 255, 0.1);
}

.pricing-card.featured::before {
  content: '推荐';
  position: absolute;
  top: -12px; left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: var(--bg-primary);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: 50px;
}

.pricing-name {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.pricing-price {
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 4px;
  color: var(--accent);
}

.pricing-price .currency { font-size: 1.2rem; }
.pricing-price .period {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--text-muted);
}

.pricing-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.pricing-features {
  text-align: left;
  margin-bottom: 28px;
}

.pricing-features li {
  padding: 8px 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.pricing-features li::before {
  content: '✓';
  color: var(--success);
  font-weight: 700;
  flex-shrink: 0;
}

.pricing-features li.disabled {
  opacity: 0.4;
}

.pricing-features li.disabled::before {
  content: '—';
  color: var(--text-muted);
}

.pricing-card .btn {
  width: 100%;
  justify-content: center;
}

.pricing-card.featured .btn { background: var(--accent); }
.pricing-card.featured .btn:hover { background: #66e5ff; }

/* --- Stats Bar --- */
.stats-bar {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 60px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item .stat-value {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1.2;
}

.stat-item .stat-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 8px;
}

/* --- Deploy Section --- */
.deploy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.deploy-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
  transition: all var(--transition);
}

.deploy-card:hover {
  border-color: rgba(0, 212, 255, 0.3);
  transform: translateY(-2px);
}

.deploy-icon { font-size: 2.5rem; margin-bottom: 16px; }
.deploy-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
.deploy-card p { font-size: 0.9rem; color: var(--text-secondary); }

/* --- Global Nodes Section --- */
.nodes-wrap {
  max-width: 960px;
  margin: 0 auto;
}

.nodes-group {
  margin-bottom: 0;
}

.nodes-group-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 28px;
}

.nodes-group-icon {
  font-size: 1.3rem;
}

.nodes-group-header h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.nodes-group-count {
  background: var(--accent-dim);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 50px;
  border: 1px solid rgba(0, 212, 255, 0.2);
}

.nodes-grid {
  display: grid;
  gap: 16px;
}

.nodes-grid.intl {
  grid-template-columns: repeat(4, 1fr);
}

.nodes-grid.domestic {
  grid-template-columns: repeat(4, 1fr);
}

.node-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 16px;
  text-align: center;
  transition: all var(--transition);
  position: relative;
  cursor: default;
}

.node-card:hover {
  border-color: rgba(0, 212, 255, 0.35);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 212, 255, 0.08);
}

.node-marker {
  position: relative;
  width: 14px;
  height: 14px;
  margin: 0 auto 14px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.6), 0 0 24px rgba(0, 212, 255, 0.25);
}

.node-marker.primary {
  background: var(--success);
  box-shadow: 0 0 10px rgba(0, 230, 118, 0.6), 0 0 24px rgba(0, 230, 118, 0.25);
}

.node-pulse {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 100%; height: 100%;
  background: inherit;
  border-radius: 50%;
  animation: nodePulse 2s ease-out infinite;
}

@keyframes nodePulse {
  0% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 0.8;
  }
  100% {
    transform: translate(-50%, -50%) scale(2.8);
    opacity: 0;
  }
}

.node-info {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.node-city-en {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.node-city {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.node-tag {
  display: inline-block;
  margin-top: 4px;
  padding: 2px 10px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: 50px;
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}

.node-card:hover .node-tag {
  border-color: rgba(0, 212, 255, 0.25);
  color: var(--accent);
}

/* Divider between international and domestic */
.nodes-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  padding: 24px 0;
}

.divider-line {
  width: 120px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-light), transparent);
}

.divider-dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  margin: 0 8px;
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.5);
}

.nodes-footer-text {
  margin-top: 32px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.nodes-footer-text strong {
  color: var(--accent);
  font-weight: 700;
}

/* --- Testimonials --- */
.testimonial {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.testimonial blockquote {
  font-size: 1.2rem;
  font-style: italic;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.7;
}

.testimonial blockquote::before { content: '"'; color: var(--accent); font-size: 2rem; }
.testimonial blockquote::after { content: '"'; color: var(--accent); font-size: 2rem; }

.testimonial-author {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* --- FAQ --- */
.faq-list {
  max-width: 700px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border);
}

.faq-question {
  width: 100%;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 600;
  padding: 20px 0;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  transition: color var(--transition);
}

.faq-question:hover { color: var(--accent); }

.faq-icon {
  flex-shrink: 0;
  transition: transform var(--transition);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.faq-item.open .faq-icon { transform: rotate(45deg); color: var(--accent); }

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease-out, padding 0.4s ease-out;
}

.faq-item.open .faq-answer {
  max-height: 300px;
  padding-bottom: 20px;
}

.faq-answer p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- CTA Section --- */
.cta-section {
  text-align: center;
  padding: 100px 0;
  background: var(--bg-secondary);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.cta-section h2 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-section p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
}

/* --- Footer --- */
.footer {
  padding: 60px 0 30px;
  border-top: 1px solid var(--border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 12px;
}

.footer-col h4 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
  color: var(--text-secondary);
}

.footer-col a {
  display: block;
  color: var(--text-muted);
  font-size: 0.9rem;
  padding: 4px 0;
  transition: color var(--transition);
}

.footer-col a:hover { color: var(--accent); }

/* --- 友情链接 --- */
.footer-links {
  padding-top: 25px;
  margin-top: 10px;
  border-top: 1px solid var(--border);
}

.footer-links h4 {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 14px;
  font-weight: 600;
}

.footer-links-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
}

.footer-links-grid a {
  color: #6b7280;
  font-size: 0.82rem;
  text-decoration: none;
  transition: color 0.2s;
  padding: 3px 10px;
  border-radius: 3px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
}

.footer-links-grid a:hover {
  color: var(--accent);
  border-color: rgba(0, 212, 255, 0.3);
  background: rgba(0, 212, 255, 0.05);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 30px;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* --- Page Header (Sub Pages) --- */
.page-header {
  padding: 140px 24px 60px;
  text-align: center;
  position: relative;
}

.page-header h1 {
  font-size: 2.8rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}

.page-header p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* --- Pricing Page Specific --- */
.pricing-page .pricing-grid {
  padding-bottom: 40px;
}

.pricing-faq {
  padding: 80px 0;
  background: var(--bg-secondary);
}

/* --- Features Page Specific --- */
.features-detail {
  padding: 40px 0 100px;
}

.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  padding: 60px 0;
  border-bottom: 1px solid var(--border);
}

.feature-block:last-child { border-bottom: none; }

.feature-block:nth-child(even) { direction: rtl; }
.feature-block:nth-child(even) .feature-block-text { direction: ltr; }

.feature-block-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.feature-block h3 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-block p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.feature-block ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.feature-tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--accent-dim);
  border-radius: 50px;
  font-size: 0.8rem;
  color: var(--accent);
}

.feature-block-visual {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  min-height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  color: var(--accent);
  opacity: 0.6;
}

/* --- Solutions Page --- */
.solution-detail {
  padding: 40px 0 100px;
}

.solution-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  padding: 60px 0;
  border-bottom: 1px solid var(--border);
}

.solution-block:last-child { border-bottom: none; }

.solution-block:nth-child(even) { direction: rtl; }
.solution-block:nth-child(even) .solution-block-text { direction: ltr; }

.solution-block h3 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.solution-block .solution-subtitle {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.solution-block p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 20px;
}

.solution-benefits {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.solution-benefit {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.solution-benefit .benefit-icon {
  color: var(--success);
  flex-shrink: 0;
  margin-top: 2px;
}

.solution-block-visual {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  min-height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  opacity: 0.5;
}

/* --- About Page --- */
.about-intro {
  padding: 0 0 80px;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-text h2 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.about-text p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.about-values {
  padding: 80px 0;
  background: var(--bg-secondary);
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.value-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
}

.value-card .value-icon { font-size: 2rem; margin-bottom: 16px; }
.value-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
.value-card p { font-size: 0.9rem; color: var(--text-secondary); }

/* --- Animations --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* --- Scroll Reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .tab-content { grid-template-columns: repeat(2, 1fr); }
  .solutions-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
  .feature-block { grid-template-columns: 1fr; gap: 32px; }
  .feature-block:nth-child(even) { direction: ltr; }
  .solution-block { grid-template-columns: 1fr; gap: 32px; }
  .solution-block:nth-child(even) { direction: ltr; }
  .about-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .hero h1 { font-size: 2.2rem; }
  .hero p { font-size: 1rem; }
  .section-title { font-size: 1.8rem; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }

  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0; right: 0;
    background: rgba(10, 14, 39, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-100%);
    opacity: 0;
    transition: all var(--transition);
    pointer-events: none;
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav-toggle { display: flex; }

  .features-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .tab-content { grid-template-columns: 1fr; }
  .solutions-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .deploy-grid { grid-template-columns: 1fr; }

  /* Global Nodes */
  .nodes-grid.intl,
  .nodes-grid.domestic { grid-template-columns: repeat(2, 1fr); }
  .divider-line { width: 60px; }

  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
  .values-grid { grid-template-columns: 1fr; }
  .tabs-nav { flex-wrap: wrap; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 1.8rem; }
  .section { padding: 60px 0; }
  .stats-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: center; }
  .btn { width: 100%; justify-content: center; }
}