/* ==========================================================================
   高速VPN - 霓虹脉冲暗夜版 官方核心样式库
   Visual Concept: 深海黑蓝 (#07111F) + 电光蓝 (#00F0FF) + 脉冲紫 (#A855F7) + 荧光绿 (#00FF88)
   ========================================================================== */

:root {
  --bg-dark: #07111F;
  --bg-card: rgba(11, 25, 44, 0.75);
  --bg-card-hover: rgba(16, 36, 64, 0.85);
  --bg-card-active: rgba(20, 45, 80, 0.95);
  --bg-glass: rgba(15, 23, 42, 0.65);
  
  --neon-blue: #00F0FF;
  --neon-blue-hover: #38BDF8;
  --neon-blue-glow: rgba(0, 240, 255, 0.25);
  --neon-blue-bright: rgba(0, 240, 255, 0.6);
  
  --neon-purple: #A855F7;
  --neon-purple-hover: #C084FC;
  --neon-purple-glow: rgba(168, 85, 247, 0.25);
  
  --neon-green: #00FF88;
  --neon-green-glow: rgba(0, 255, 136, 0.25);
  
  --neon-red: #FF3366;
  --neon-yellow: #FBBF24;
  
  --text-main: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --text-light: #E2E8F0;
  
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-neon-blue: rgba(0, 240, 255, 0.28);
  --border-neon-purple: rgba(168, 85, 247, 0.28);
  
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", Consolas, Monaco, "Courier New", monospace;
  
  --container-width: 1240px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  
  --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.65;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(168, 85, 247, 0.12) 0%, transparent 45%),
    radial-gradient(circle at 85% 30%, rgba(0, 240, 255, 0.08) 0%, transparent 40%),
    linear-gradient(to bottom, #07111F 0%, #050B14 100%);
  background-attachment: fixed;
  min-height: 100vh;
}

/* Background Cyber Grid */
.cyber-grid-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  background-size: 60px 60px;
  background-image: 
    linear-gradient(to right, rgba(0, 240, 255, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(168, 85, 247, 0.03) 1px, transparent 1px);
  mask-image: radial-gradient(ellipse at center, black 40%, transparent 90%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 40%, transparent 90%);
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* Typography Helpers */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-main);
  font-weight: 700;
  line-height: 1.25;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

.text-gradient-cyan {
  background: linear-gradient(135deg, #FFFFFF 20%, #00F0FF 80%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-gradient-purple {
  background: linear-gradient(135deg, #00F0FF 10%, #A855F7 90%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-cyan { color: var(--neon-blue); }
.text-purple { color: var(--neon-purple); }
.text-green { color: var(--neon-green); }
.text-muted { color: var(--text-muted); }

/* Navigation Bar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(7, 17, 31, 0.85);
  border-bottom: 1px solid var(--border-glass);
  transition: var(--transition);
}

.navbar.scrolled {
  border-bottom-color: var(--border-neon-blue);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.5), 0 0 15px rgba(0, 240, 255, 0.08);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.5px;
}

.logo-icon-wrap {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.2), rgba(168, 85, 247, 0.2));
  border: 1px solid var(--border-neon-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 15px var(--neon-blue-glow);
  position: relative;
  overflow: hidden;
}

.logo-icon-wrap::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(0, 240, 255, 0.4) 0%, transparent 60%);
  animation: pulse-ring 4s ease-in-out infinite;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #FFF;
}

.brand-tag {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--neon-blue);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-light);
  padding: 6px 0;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple));
  transition: width 0.25s ease;
  box-shadow: 0 0 8px var(--neon-blue);
}

.nav-link:hover {
  color: var(--neon-blue);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn-neon-glow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.9), rgba(168, 85, 247, 0.9));
  color: #07111F;
  font-weight: 700;
  font-size: 14px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.35);
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.3);
}

.btn-neon-glow:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(0, 240, 255, 0.6), 0 0 15px rgba(168, 85, 247, 0.4);
  color: #030712;
}

.btn-neon-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  background: rgba(11, 25, 44, 0.6);
  border: 1px solid var(--border-neon-blue);
  color: var(--neon-blue);
  font-weight: 600;
  font-size: 14px;
  backdrop-filter: blur(10px);
  box-shadow: inset 0 0 12px rgba(0, 240, 255, 0.1);
  transition: var(--transition);
}

.btn-neon-outline:hover {
  background: rgba(0, 240, 255, 0.12);
  border-color: var(--neon-blue);
  color: #FFF;
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.25), inset 0 0 15px rgba(0, 240, 255, 0.2);
  transform: translateY(-2px);
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 24px;
  cursor: pointer;
  padding: 6px;
}

/* Hero Section */
.hero-section {
  padding: 150px 0 90px;
  position: relative;
  overflow: hidden;
}

.hero-glow-blob {
  position: absolute;
  top: 15%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.18) 0%, rgba(0, 240, 255, 0.08) 50%, transparent 70%);
  filter: blur(60px);
  pointer-events: none;
  z-index: 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 48px;
  position: relative;
  z-index: 1;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid var(--border-neon-blue);
  font-size: 13px;
  font-weight: 600;
  color: var(--neon-blue);
  width: fit-content;
  box-shadow: 0 0 12px rgba(0, 240, 255, 0.12);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--neon-green);
  box-shadow: 0 0 10px var(--neon-green);
  animation: ping-pulse 2s cubic-bezier(0, 0, 0.2, 1) infinite;
}

.hero-title {
  font-size: 52px;
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -1px;
}

.hero-desc {
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 580px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: -6px;
}

.tag-item {
  font-size: 12px;
  color: var(--text-light);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.tag-item::before {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--neon-blue);
  display: inline-block;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  padding-top: 8px;
}

.hero-meta-stats {
  display: flex;
  align-items: center;
  gap: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--border-glass);
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-num {
  font-size: 26px;
  font-weight: 800;
  font-family: var(--font-mono);
  color: #FFF;
}

.stat-num span {
  font-size: 14px;
  color: var(--neon-blue);
  margin-left: 2px;
}

.stat-lbl {
  font-size: 12px;
  color: var(--text-muted);
}

/* Suspended Annular Network Engine Visual Widget */
.engine-container {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 440px;
}

.engine-glass-card {
  width: 100%;
  max-width: 480px;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-neon-blue);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.6), 0 0 25px rgba(0, 240, 255, 0.15);
  position: relative;
  overflow: hidden;
}

.engine-glass-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--neon-blue), var(--neon-purple), transparent);
}

.engine-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.engine-title-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}

.engine-indicator {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--neon-green);
  box-shadow: 0 0 12px var(--neon-green);
}

.engine-title {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: #FFF;
}

.protocol-chip {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--neon-purple-hover);
  background: rgba(168, 85, 247, 0.15);
  padding: 4px 10px;
  border-radius: 20px;
  border: 1px solid rgba(168, 85, 247, 0.3);
}

/* Annular Visual Core */
.annular-stage {
  position: relative;
  width: 240px;
  height: 240px;
  margin: 0 auto 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ring-outer {
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  border: 2px dashed rgba(0, 240, 255, 0.35);
  animation: spin-clockwise 24s linear infinite;
}

.ring-middle {
  position: absolute;
  width: 78%;
  height: 78%;
  border-radius: 50%;
  border: 2px solid transparent;
  border-top-color: var(--neon-purple);
  border-bottom-color: var(--neon-blue);
  box-shadow: 0 0 15px var(--neon-purple-glow);
  animation: spin-counter 12s linear infinite;
}

.ring-inner {
  position: absolute;
  width: 58%;
  height: 58%;
  border-radius: 50%;
  border: 1px solid rgba(0, 255, 136, 0.3);
  box-shadow: inset 0 0 15px rgba(0, 255, 136, 0.2);
}

.engine-core-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 2;
  text-align: center;
}

.speed-value {
  font-size: 38px;
  font-weight: 800;
  font-family: var(--font-mono);
  color: #FFF;
  line-height: 1;
  text-shadow: 0 0 18px rgba(0, 240, 255, 0.6);
}

.speed-unit {
  font-size: 12px;
  font-weight: 700;
  color: var(--neon-blue);
  letter-spacing: 1px;
  margin-top: 4px;
}

.ping-pill {
  margin-top: 8px;
  font-size: 11px;
  font-family: var(--font-mono);
  background: rgba(0, 255, 136, 0.15);
  color: var(--neon-green);
  border: 1px solid rgba(0, 255, 136, 0.4);
  padding: 2px 8px;
  border-radius: 12px;
}

/* Engine Node Grid Stats */
.engine-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  background: rgba(7, 17, 31, 0.6);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 12px;
  margin-bottom: 20px;
}

.metric-col {
  text-align: center;
}

.metric-col .m-label {
  font-size: 11px;
  color: var(--text-muted);
  display: block;
  margin-bottom: 2px;
}

.metric-col .m-val {
  font-size: 14px;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text-light);
}

.live-circuits {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.circuit-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 12px;
  transition: var(--transition);
}

.circuit-item.active {
  border-color: rgba(0, 240, 255, 0.4);
  background: rgba(0, 240, 255, 0.06);
}

.circuit-name {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-light);
}

.circuit-ping {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--neon-green);
}

.btn-speedtest {
  width: 100%;
  margin-top: 16px;
  padding: 12px;
  background: linear-gradient(90deg, rgba(0, 240, 255, 0.15), rgba(168, 85, 247, 0.15));
  border: 1px solid var(--border-neon-blue);
  color: var(--neon-blue);
  font-weight: 700;
  font-size: 13px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: var(--transition);
}

.btn-speedtest:hover {
  background: linear-gradient(90deg, rgba(0, 240, 255, 0.3), rgba(168, 85, 247, 0.3));
  border-color: var(--neon-blue);
  color: #FFF;
  box-shadow: 0 0 16px var(--neon-blue-glow);
}

/* Core Advantages Section */
.section-padding {
  padding: 90px 0;
  position: relative;
}

.section-head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px;
}

.section-badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--neon-blue);
  margin-bottom: 12px;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid var(--border-neon-blue);
}

.section-title {
  font-size: 38px;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.section-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--neon-blue), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-neon-blue);
  background: var(--bg-card-hover);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4), 0 0 20px var(--neon-blue-glow);
}

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

.feature-icon-box {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid var(--border-neon-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  color: var(--neon-blue);
  box-shadow: 0 0 16px rgba(0, 240, 255, 0.1);
  transition: var(--transition);
}

.feature-card:hover .feature-icon-box {
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.2), rgba(168, 85, 247, 0.2));
  color: #FFF;
  border-color: var(--neon-blue);
}

.feature-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  flex-grow: 1;
}

.feature-bullets {
  list-style: none;
  margin-top: 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 16px;
}

.feature-bullets li {
  font-size: 13px;
  color: var(--text-light);
  display: flex;
  align-items: center;
  gap: 8px;
}

.feature-bullets li::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--neon-green);
  display: inline-block;
  flex-shrink: 0;
}

/* Interactive Speed Test & Global Nodes Section */
.speedtest-section {
  background: rgba(11, 25, 44, 0.4);
  border-top: 1px solid var(--border-glass);
  border-bottom: 1px solid var(--border-glass);
}

.nodes-monitor-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}

.node-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 20px;
  transition: var(--transition);
  position: relative;
}

.node-card:hover {
  border-color: var(--border-neon-blue);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
}

.node-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.node-flag-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 15px;
}

.node-status-pill {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--neon-green);
  background: rgba(0, 255, 136, 0.1);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid rgba(0, 255, 136, 0.2);
}

.node-data-row {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  margin-bottom: 6px;
  color: var(--text-secondary);
}

.node-data-row span:last-child {
  font-family: var(--font-mono);
  color: var(--text-light);
  font-weight: 600;
}

.node-progress {
  height: 4px;
  width: 100%;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 2px;
  margin-top: 10px;
  overflow: hidden;
}

.node-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--neon-blue), var(--neon-green));
}

/* Pricing Section */
.pricing-toggle-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
}

.pricing-toggle {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-full);
  padding: 4px;
  display: flex;
  gap: 4px;
}

.toggle-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 600;
  padding: 8px 24px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition);
}

.toggle-btn.active {
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
  color: #07111F;
  font-weight: 700;
  box-shadow: 0 0 15px var(--neon-blue-glow);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  position: relative;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.pricing-card.popular {
  border-color: var(--neon-blue);
  background: linear-gradient(180deg, rgba(16, 36, 64, 0.9) 0%, rgba(11, 25, 44, 0.8) 100%);
  box-shadow: 0 0 35px rgba(0, 240, 255, 0.2), inset 0 0 15px rgba(0, 240, 255, 0.08);
  transform: scale(1.03);
  z-index: 2;
}

.popular-badge {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple));
  color: #07111F;
  font-size: 11px;
  font-weight: 800;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  letter-spacing: 1px;
  text-transform: uppercase;
  box-shadow: 0 0 12px var(--neon-blue);
}

.plan-name {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 13px;
  color: var(--text-secondary);
  min-height: 38px;
  margin-bottom: 20px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
}

.plan-currency {
  font-size: 20px;
  font-weight: 700;
  color: var(--neon-blue);
}

.plan-price {
  font-size: 42px;
  font-weight: 800;
  font-family: var(--font-mono);
  color: #FFF;
}

.plan-period {
  font-size: 13px;
  color: var(--text-muted);
}

.plan-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.plan-features li {
  font-size: 13px;
  color: var(--text-light);
  display: flex;
  align-items: flex-start;
  gap: 10px;
  line-height: 1.45;
}

.plan-features li .check-icon {
  color: var(--neon-green);
  font-weight: bold;
  flex-shrink: 0;
}

.plan-btn {
  width: 100%;
  text-align: center;
  padding: 12px 0;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 14px;
  transition: var(--transition);
}

/* Target Audience / Use Cases */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.audience-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: var(--transition);
}

.audience-card:hover {
  border-color: var(--border-neon-purple);
  box-shadow: 0 0 20px var(--neon-purple-glow);
  transform: translateY(-4px);
}

.audience-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.audience-icon {
  font-size: 24px;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(168, 85, 247, 0.12);
  border: 1px solid var(--border-neon-purple);
  display: flex;
  align-items: center;
  justify-content: center;
}

.audience-title {
  font-size: 18px;
  font-weight: 700;
}

.audience-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* Client Setup Guide & Tabs */
.client-tabs-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.client-tab-btn {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-glass);
  color: var(--text-light);
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
}

.client-tab-btn:hover {
  border-color: var(--border-neon-blue);
  color: #FFF;
}

.client-tab-btn.active {
  background: rgba(0, 240, 255, 0.15);
  border-color: var(--neon-blue);
  color: var(--neon-blue);
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.2);
}

.client-tab-panel {
  display: none;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 40px;
  backdrop-filter: blur(20px);
}

.client-tab-panel.active {
  display: block;
  animation: fadeIn 0.4s ease;
}

.tutorial-step-flow {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}

.step-card {
  background: rgba(7, 17, 31, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-md);
  padding: 24px;
  position: relative;
}

.step-badge {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
  color: var(--neon-blue);
  background: rgba(0, 240, 255, 0.1);
  padding: 4px 10px;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 12px;
}

.step-card h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.step-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.step-card code {
  display: block;
  margin-top: 10px;
  padding: 8px 12px;
  border-radius: 6px;
  background: #030712;
  border: 1px solid rgba(255, 255, 255, 0.08);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--neon-blue);
  word-break: break-all;
}

/* User Reviews / Testimonials */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.review-card:hover {
  border-color: var(--border-neon-blue);
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.review-stars {
  color: #FBBF24;
  font-size: 14px;
  margin-bottom: 14px;
  letter-spacing: 2px;
}

.review-text {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: 20px;
  flex-grow: 1;
}

.reviewer-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 16px;
}

.reviewer-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #07111F;
}

.reviewer-name {
  font-size: 14px;
  font-weight: 700;
}

.reviewer-role {
  font-size: 12px;
  color: var(--text-muted);
}

/* FAQ Accordion */
.faq-wrap {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: var(--border-neon-blue);
}

.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 22px 26px;
  color: var(--text-main);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.faq-icon {
  font-size: 20px;
  color: var(--neon-blue);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  color: var(--neon-purple);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 26px;
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.8;
}

.faq-item.active .faq-answer {
  max-height: 600px;
  padding-bottom: 22px;
}

/* Featured Articles Grid */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-neon-blue);
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.5), 0 0 20px var(--neon-blue-glow);
}

.article-img-wrap {
  width: 100%;
  height: 190px;
  position: relative;
  overflow: hidden;
  background: #0B192C;
}

.article-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.article-card:hover .article-img-wrap img {
  transform: scale(1.05);
}

.article-badge-category {
  position: absolute;
  top: 14px;
  left: 14px;
  background: rgba(7, 17, 31, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-neon-blue);
  color: var(--neon-blue);
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}

.article-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-date-read {
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}

.article-title {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 12px;
  color: var(--text-main);
  transition: color 0.2s ease;
}

.article-card:hover .article-title {
  color: var(--neon-blue);
}

.article-excerpt {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 18px;
  flex-grow: 1;
}

.article-link {
  font-size: 13px;
  font-weight: 700;
  color: var(--neon-blue);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.article-card:hover .article-link {
  color: var(--neon-purple-hover);
  transform: translateX(4px);
}

/* Call to Action Banner */
.cta-banner {
  background: linear-gradient(135deg, rgba(16, 36, 64, 0.95), rgba(7, 17, 31, 0.95));
  border: 1px solid var(--border-neon-blue);
  border-radius: var(--radius-lg);
  padding: 60px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 0 50px rgba(0, 240, 255, 0.15);
  margin: 60px 0;
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 240, 255, 0.15) 0%, transparent 70%);
  filter: blur(40px);
  pointer-events: none;
}

.cta-title {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.cta-desc {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 650px;
  margin: 0 auto 32px;
}

/* Footer Section */
.footer {
  background: #030712;
  border-top: 1px solid var(--border-glass);
  padding: 80px 0 36px;
  position: relative;
  z-index: 10;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 60px;
}

.footer-col h5 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 20px;
  color: #FFF;
  letter-spacing: 0.5px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col ul a {
  font-size: 13px;
  color: var(--text-secondary);
}

.footer-col ul a:hover {
  color: var(--neon-blue);
  padding-left: 4px;
}

.footer-about {
  padding-right: 20px;
}

.footer-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 16px 0 20px;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 28px;
  font-size: 12px;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 16px;
}

.footer-bottom-links {
  display: flex;
  gap: 20px;
}

.footer-bottom-links a:hover {
  color: var(--neon-blue);
}

/* SEO Article Page Styles */
.article-header {
  padding: 140px 0 50px;
  text-align: center;
  position: relative;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.breadcrumbs a {
  color: var(--text-secondary);
}

.breadcrumbs a:hover {
  color: var(--neon-blue);
}

.article-page-title {
  font-size: 42px;
  font-weight: 800;
  line-height: 1.25;
  max-width: 900px;
  margin: 0 auto 20px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  font-size: 13px;
  color: var(--text-secondary);
}

.article-content-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 48px;
  padding-bottom: 90px;
}

.article-main-body {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 48px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-light);
}

.article-main-body h2 {
  font-size: 26px;
  margin: 40px 0 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(0, 240, 255, 0.2);
  color: #FFF;
  position: relative;
}

.article-main-body h2::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 60px;
  height: 2px;
  background: var(--neon-blue);
  box-shadow: 0 0 10px var(--neon-blue);
}

.article-main-body h3 {
  font-size: 20px;
  margin: 28px 0 14px;
  color: var(--neon-blue-hover);
}

.article-main-body p {
  margin-bottom: 20px;
}

.article-main-body ul, .article-main-body ol {
  margin: 0 0 24px 24px;
}

.article-main-body li {
  margin-bottom: 8px;
}

.article-main-body blockquote {
  background: rgba(0, 240, 255, 0.05);
  border-left: 4px solid var(--neon-blue);
  padding: 16px 20px;
  border-radius: 0 8px 8px 0;
  margin: 24px 0;
  font-style: italic;
  color: #E2E8F0;
}

.article-main-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 14px;
}

.article-main-body th, .article-main-body td {
  padding: 12px 16px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  text-align: left;
}

.article-main-body th {
  background: rgba(0, 240, 255, 0.1);
  color: var(--neon-blue);
  font-weight: 700;
}

.article-main-body tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.02);
}

.article-main-body code {
  background: rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--neon-blue);
}

.article-main-body pre {
  background: #030712;
  border: 1px solid var(--border-neon-blue);
  border-radius: 8px;
  padding: 20px;
  overflow-x: auto;
  margin: 24px 0;
}

.article-main-body pre code {
  background: none;
  border: none;
  padding: 0;
  color: #E2E8F0;
}

.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 24px;
}

.sidebar-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  color: #FFF;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 13px;
}

.toc-list a {
  color: var(--text-secondary);
  display: block;
  padding: 4px 0;
}

.toc-list a:hover {
  color: var(--neon-blue);
  padding-left: 6px;
}

/* Animations */
@keyframes spin-clockwise {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes spin-counter {
  from { transform: rotate(360deg); }
  to { transform: rotate(0deg); }
}

@keyframes ping-pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0, 255, 136, 0.7); }
  70% { transform: scale(1.1); box-shadow: 0 0 0 8px rgba(0, 255, 136, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0, 255, 136, 0); }
}

@keyframes pulse-ring {
  0% { transform: scale(0.8); opacity: 0.8; }
  50% { transform: scale(1.2); opacity: 0.3; }
  100% { transform: scale(0.8); opacity: 0.8; }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-content {
    align-items: center;
  }
  .hero-meta-stats {
    justify-content: center;
  }
  .feature-grid, .pricing-grid, .audience-grid, .reviews-grid, .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .nodes-monitor-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .article-content-layout {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 72px;
    left: 0;
    width: 100%;
    background: rgba(7, 17, 31, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border-neon-blue);
    transform: translateY(-150%);
    transition: transform 0.3s ease;
  }
  .nav-links.active {
    transform: translateY(0);
  }
  .mobile-toggle {
    display: block;
  }
  .hero-title {
    font-size: 36px;
  }
  .feature-grid, .pricing-grid, .audience-grid, .reviews-grid, .articles-grid, .nodes-monitor-grid {
    grid-template-columns: 1fr;
  }
  .pricing-card.popular {
    transform: none;
  }
  .tutorial-step-flow {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
  .article-main-body {
    padding: 24px 16px;
  }
  .article-page-title {
    font-size: 28px;
  }
}