/* ==========================================================================
   赛博云 (guanwang.saibo-yun.homes) - 亮底极简现代化原生样式表
   Design: Modern Clean Light Theme / Ultra High Performance / Mobile-First Responsive
   ========================================================================== */

:root {
  --bg-main: #f8fafc;
  --bg-subtle: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --bg-elevated: #f8fafc;
  --border-color: #e2e8f0;
  --border-card: #e2e8f0;
  --border-focus: #0284c7;
  
  --text-main: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  
  --primary: #0284c7;
  --primary-hover: #0369a1;
  --primary-glow: rgba(2, 132, 199, 0.18);
  --accent: #2563eb;
  --accent-gradient: linear-gradient(135deg, #0284c7 0%, #2563eb 100%);
  --accent-gradient-hover: linear-gradient(135deg, #0369a1 0%, #1d4ed8 100%);
  --success: #16a34a;
  --warning: #d97706;
  --danger: #dc2626;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  
  --container-max: 1200px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  --shadow-card: 0 4px 16px -2px rgba(15, 23, 42, 0.05), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
  --shadow-card-hover: 0 12px 28px -4px rgba(15, 23, 42, 0.1), 0 4px 10px -2px rgba(15, 23, 42, 0.04);
  --shadow-glow: 0 4px 20px rgba(2, 132, 199, 0.25);
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);

  /* Cyberpunk High-Tech Accents (Tailored for Bright Theme) */
  --cyber-cyan: #00f0ff;
  --cyber-blue: #0284c7;
  --cyber-neon: #0ea5e9;
  --cyber-magenta: #ec4899;
  --cyber-emerald: #10b981;
  --cyber-border: rgba(14, 165, 233, 0.25);
  --cyber-glow-cyan: 0 0 16px rgba(0, 240, 255, 0.35);
  --cyber-glow-blue: 0 4px 20px rgba(2, 132, 199, 0.35), 0 0 12px rgba(14, 165, 233, 0.2);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  width: 100%;
}

body {
  line-height: 1.65;
  background-color: var(--bg-main);
  background-image: 
    linear-gradient(to right, rgba(2, 132, 199, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(2, 132, 199, 0.04) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  width: 100%;
  -webkit-tap-highlight-color: transparent;
}

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

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

img, svg {
  vertical-align: middle;
  max-width: 100%;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.85rem 0;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 800;
  font-size: 1.35rem;
  color: #0f172a;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

.logo-icon-img {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  display: block;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(2, 132, 199, 0.25);
  transition: var(--transition);
}

.brand-logo:hover .logo-icon-img {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.35);
}

.logo-text {
  color: #0f172a;
}

.logo-badge {
  background: var(--accent-gradient);
  color: #ffffff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  box-shadow: 0 2px 6px rgba(2, 132, 199, 0.3);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
  margin: 0 auto;
}

.nav-link {
  color: var(--text-secondary);
  font-size: 0.93rem;
  font-weight: 500;
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
  background: #f1f5f9;
}

.header-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-gradient);
  color: #ffffff !important;
  font-weight: 600;
  font-size: 0.88rem;
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-full);
  box-shadow: 0 2px 8px rgba(2, 132, 199, 0.3);
  transition: var(--transition);
  white-space: nowrap;
  flex-shrink: 0;
}

.header-cta-btn:hover {
  background: var(--accent-gradient-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.4);
}

/* ==========================================================================
   Hero Section - Cyberpunk High-Tech Airport Edition (亮底大气 / 极速雷达)
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 3.5rem 0 3.25rem;
  text-align: center;
  background: radial-gradient(circle at 50% 12%, rgba(14, 165, 233, 0.12) 0%, rgba(248, 250, 252, 0.98) 65%);
  border-bottom: 1px solid var(--border-color);
  overflow: hidden;
}

.hero-cyber-grid-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  background-image: 
    linear-gradient(to right, rgba(2, 132, 199, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(2, 132, 199, 0.05) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse at center, rgba(0,0,0,1) 40%, rgba(0,0,0,0) 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, rgba(0,0,0,1) 40%, rgba(0,0,0,0) 80%);
}

.hero-container {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* 1. Cyber HUD Live Status Ribbon */
.hero-hud-bar {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.65rem;
  background: #ffffff;
  border: 1px solid #bae6fd;
  padding: 0.35rem 1rem;
  border-radius: var(--radius-full);
  box-shadow: 0 2px 12px rgba(2, 132, 199, 0.08);
  margin-bottom: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.hud-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 600;
  color: #0f172a;
}

.hud-label {
  color: var(--text-muted);
  font-weight: 500;
}

.hud-sep {
  color: var(--cyber-neon);
  opacity: 0.7;
  font-weight: 700;
}

.hud-dot.live-blink {
  width: 8px;
  height: 8px;
  background-color: var(--cyber-emerald);
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.8);
  animation: hudPulse 2s infinite ease-in-out;
}

@keyframes hudPulse {
  0%, 100% {
    transform: scale(1);
    opacity: 1;
    box-shadow: 0 0 8px rgba(16, 185, 129, 0.8);
  }
  50% {
    transform: scale(1.25);
    opacity: 0.6;
    box-shadow: 0 0 14px rgba(16, 185, 129, 0.4);
  }
}

/* 2. Brand Tag */
.hero-brand-wrap {
  margin-bottom: 0.85rem;
}

.hero-brand-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--primary);
  background: #e0f2fe;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 0.3rem 0.95rem;
  border-radius: var(--radius-full);
  border: 1px solid #bae6fd;
  font-family: var(--font-mono);
}

.cyber-bracket {
  color: var(--cyber-neon);
  font-weight: 800;
}

/* 3. Main Title & Subtitle */
.hero-title {
  font-size: clamp(1.85rem, 3.8vw, 2.75rem);
  font-weight: 800;
  line-height: 1.28;
  color: #0f172a;
  max-width: 900px;
  margin: 0 auto 1rem;
  letter-spacing: -0.02em;
}

.cyber-gradient-text {
  background: linear-gradient(135deg, #0284c7 0%, #0ea5e9 50%, #2563eb 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 760px;
  margin: 0 auto 1.85rem;
  line-height: 1.7;
}

/* 4. Action Buttons */
.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.hero-cta-cyber {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  background: linear-gradient(135deg, #0284c7 0%, #0284c7 40%, #2563eb 100%);
  color: #ffffff !important;
  font-size: 1.05rem;
  font-weight: 700;
  padding: 0.82rem 2.5rem;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 20px rgba(2, 132, 199, 0.35), 0 0 15px rgba(14, 165, 233, 0.2);
  transition: var(--transition);
  border: 1px solid rgba(255, 255, 255, 0.3);
  text-decoration: none;
}

.hero-cta-cyber:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(2, 132, 199, 0.45), 0 0 25px rgba(14, 165, 233, 0.4);
  background: linear-gradient(135deg, #0369a1 0%, #0284c7 40%, #1d4ed8 100%);
}

.cta-cyber-icon {
  font-size: 1.15rem;
  transition: transform 0.2s ease;
}

.hero-cta-cyber:hover .cta-cyber-icon {
  transform: translateX(3px) scale(1.15);
}

.hero-cta-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: #ffffff;
  color: var(--text-main) !important;
  font-size: 0.98rem;
  font-weight: 600;
  padding: 0.8rem 1.85rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
  transition: var(--transition);
}

.hero-cta-secondary:hover {
  border-color: var(--primary);
  color: var(--primary) !important;
  background: #f8fafc;
  transform: translateY(-1px);
}

/* 5. Trust Badges */
.hero-trust-badges {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2.25rem;
}

.trust-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.trust-icon {
  font-size: 0.9rem;
}

/* 6. Live Cyber Node Radar HUD Card */
.cyber-radar-card {
  width: 100%;
  max-width: 920px;
  background: #ffffff;
  border: 1px solid #bae6fd;
  border-radius: var(--radius-lg);
  box-shadow: 0 12px 35px -8px rgba(2, 132, 199, 0.12), 0 0 0 1px rgba(14, 165, 233, 0.1);
  overflow: hidden;
  text-align: left;
  position: relative;
}

.cyber-radar-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #0284c7 0%, #00f0ff 50%, #ec4899 100%);
}

.radar-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.35rem;
  background: #f8fafc;
  border-bottom: 1px solid #e2e8f0;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.radar-brand-info {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.radar-live-signal {
  width: 9px;
  height: 9px;
  background: #0284c7;
  border-radius: 50%;
  box-shadow: 0 0 10px #00f0ff;
  animation: radarSignal 1.8s infinite ease-out;
}

@keyframes radarSignal {
  0% { transform: scale(0.9); opacity: 1; }
  50% { transform: scale(1.3); opacity: 0.6; }
  100% { transform: scale(0.9); opacity: 1; }
}

.radar-mono-label {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: #0f172a;
  letter-spacing: 0.02em;
}

.radar-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--primary);
  background: #e0f2fe;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  border: 1px solid #bae6fd;
}

.radar-node-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.85rem;
  padding: 1.25rem 1.35rem;
}

@media (max-width: 680px) {
  .radar-node-list {
    grid-template-columns: 1fr;
  }
}

.radar-node-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  transition: var(--transition);
}

.radar-node-item:hover {
  background: #ffffff;
  border-color: #38bdf8;
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(14, 165, 233, 0.15);
}

.node-badge-flag {
  font-size: 1.5rem;
  line-height: 1;
  flex-shrink: 0;
}

.node-main-meta {
  flex: 1;
  min-width: 0;
}

.node-title {
  display: block;
  font-weight: 700;
  font-size: 0.92rem;
  color: #0f172a;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.node-spec {
  color: var(--primary);
  font-size: 0.8rem;
  font-family: var(--font-mono);
  font-weight: 600;
}

.node-sub {
  display: block;
  font-size: 0.76rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.node-status-box {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  background: #ffffff;
  border: 1px solid #bbf7d0;
  padding: 0.25rem 0.55rem;
  border-radius: 6px;
  flex-shrink: 0;
}

.ping-number {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: #15803d;
}

.ping-signal-bars {
  display: inline-flex;
  align-items: flex-end;
  gap: 2px;
  height: 11px;
}

.ping-signal-bars span {
  width: 3px;
  background: #22c55e;
  border-radius: 1px;
}

.ping-signal-bars span:nth-child(1) { height: 4px; }
.ping-signal-bars span:nth-child(2) { height: 7px; }
.ping-signal-bars span:nth-child(3) { height: 11px; }

.radar-footer-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 0.75rem 1.35rem;
  background: #f1f5f9;
  border-top: 1px solid #e2e8f0;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.rf-item {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

/* Pricing Section - 4 Columns in One Row */
.pricing-section {
  padding: 3.5rem 0;
  background: #ffffff;
  border-bottom: 1px solid var(--border-color);
}

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 2.25rem;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--primary);
  background: #e0f2fe;
  padding: 0.25rem 0.85rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 1px solid #bae6fd;
}

.section-title {
  font-size: clamp(1.5rem, 2.5vw, 2.1rem);
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.section-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* Pricing Grid - 4 columns in one row */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.75rem 1.35rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: var(--transition);
  box-shadow: var(--shadow-card);
}

.pricing-card:hover {
  transform: translateY(-4px);
  border-color: #38bdf8;
  box-shadow: var(--shadow-card-hover);
}

.pricing-card.featured {
  border-color: #0284c7;
  background: linear-gradient(180deg, #f0f9ff 0%, #ffffff 100%);
  box-shadow: 0 10px 30px -4px rgba(2, 132, 199, 0.15);
}

.featured-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-gradient);
  color: #ffffff;
  font-size: 0.72rem;
  font-weight: 800;
  padding: 0.2rem 0.85rem;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  white-space: nowrap;
  box-shadow: 0 2px 8px rgba(2, 132, 199, 0.3);
}

.plan-header {
  margin-bottom: 0.75rem;
}

.plan-name {
  font-size: 1.25rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 0.35rem;
}

.plan-desc {
  font-size: 0.83rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.plan-price-wrap {
  margin: 1.1rem 0 1.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.plan-price {
  display: flex;
  align-items: baseline;
  gap: 0.2rem;
}

.currency {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--primary);
}

.amount {
  font-size: 2.3rem;
  font-weight: 800;
  color: #0f172a;
  line-height: 1;
}

.period {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.price-subtext {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.4rem;
}

.plan-features {
  list-style: none;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.6rem;
  line-height: 1.45;
}

.plan-feature-item strong {
  color: #0f172a;
}

.feature-check {
  color: var(--success);
  font-weight: 800;
  flex-shrink: 0;
}

.plan-btn {
  display: block;
  text-align: center;
  background: #f8fafc;
  color: #0f172a;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.plan-btn:hover {
  background: var(--accent-gradient);
  color: #ffffff !important;
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.35);
}

.pricing-card.featured .plan-btn {
  background: var(--accent-gradient);
  color: #ffffff !important;
  border: none;
}

.pricing-card.featured .plan-btn:hover {
  background: var(--accent-gradient-hover);
}

.pricing-note {
  margin-top: 1.75rem;
  font-size: 0.84rem;
  color: var(--text-secondary);
  text-align: center;
  background: #f8fafc;
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px dashed var(--border-color);
}

/* Feature 3-Card Section */
.features-section {
  padding: 4rem 0;
  background: var(--bg-main);
}

.feature-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.feature-card {
  background: #ffffff;
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 2.25rem 1.85rem;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-card);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: #38bdf8;
  box-shadow: var(--shadow-card-hover);
}

.feature-icon-box {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: #e0f2fe;
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 1.25rem;
}

.feature-card-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 0.75rem;
}

.feature-card-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1.25rem;
}

.feature-link {
  margin-top: auto;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.feature-link:hover {
  color: var(--accent);
}

/* Media & AI Support Showcase */
.showcase-section {
  padding: 4rem 0;
  background: #ffffff;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.showcase-card {
  background: #f8fafc;
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  box-shadow: var(--shadow-card);
}

.showcase-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.showcase-icon {
  font-size: 1.8rem;
}

.showcase-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: #0f172a;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag-item {
  background: #ffffff;
  color: #1e293b;
  border: 1px solid var(--border-color);
  padding: 0.35rem 0.8rem;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.showcase-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* Content Navigation Section */
.nav-grid-section {
  padding: 4rem 0;
  background: var(--bg-main);
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.topic-card {
  background: #ffffff;
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 1.6rem;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.topic-card:hover {
  border-color: #38bdf8;
  transform: translateY(-3px);
  box-shadow: 0 10px 25px -4px rgba(2, 132, 199, 0.15), 0 0 15px rgba(14, 165, 233, 0.12);
}

.topic-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.topic-num::before {
  content: "//";
  color: var(--cyber-neon);
}

.topic-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 0.5rem;
}

.topic-desc {
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1rem;
  flex-grow: 1;
}

.topic-arrow {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--primary);
}

/* SEO Articles Section */
.articles-section {
  padding: 4rem 0;
  background: #ffffff;
  border-top: 1px solid var(--border-color);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.article-card {
  background: #ffffff;
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  box-shadow: var(--shadow-card);
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: #38bdf8;
  box-shadow: 0 12px 30px -4px rgba(2, 132, 199, 0.18), 0 0 16px rgba(14, 165, 233, 0.14);
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 0.75rem;
  line-height: 1.45;
}

.article-card-title a {
  color: #0f172a;
}

.article-card-title a:hover {
  color: var(--primary);
}

.article-card-excerpt {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.article-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.kw-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--primary);
  background: #f0f9ff;
  border: 1px solid #bae6fd;
  padding: 0.18rem 0.55rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
}

/* FAQ Section */
.faq-section {
  padding: 4rem 0;
  background: var(--bg-main);
  border-top: 1px solid var(--border-color);
}

.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 1.6rem;
  box-shadow: var(--shadow-card);
}

.faq-question {
  font-size: 1.05rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 0.6rem;
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
}

.faq-q-badge {
  color: var(--primary);
  font-weight: 800;
}

.faq-answer {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  padding-left: 1.6rem;
}

/* Testimonials / User Experience */
.testimonials-section {
  padding: 4rem 0;
  background: #ffffff;
  border-top: 1px solid var(--border-color);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.testimonial-card {
  background: #f8fafc;
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.85rem;
  box-shadow: var(--shadow-card);
}

.testimonial-user {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.user-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #ffffff;
  font-size: 1rem;
  box-shadow: 0 2px 8px rgba(2, 132, 199, 0.3);
}

.user-info h4 {
  font-size: 0.98rem;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 0.15rem;
}

.user-info p {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.testimonial-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* Bottom CTA */
.bottom-cta-section {
  padding: 4.5rem 0;
  text-align: center;
  background: radial-gradient(circle at 50% 50%, #e0f2fe 0%, #f8fafc 80%);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.bottom-cta-title {
  font-size: clamp(1.8rem, 3.2vw, 2.4rem);
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 0.75rem;
  letter-spacing: -0.01em;
}

.bottom-cta-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 650px;
  margin: 0 auto 1.8rem;
}

.bottom-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-gradient);
  color: #ffffff !important;
  font-size: 1.1rem;
  font-weight: 700;
  padding: 0.85rem 2.5rem;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 20px rgba(2, 132, 199, 0.35);
  transition: var(--transition);
}

.bottom-cta-btn:hover {
  background: var(--accent-gradient-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(2, 132, 199, 0.45);
}

/* Footer - Strictly 4 Titles */
.site-footer {
  background: #ffffff;
  border-top: 1px solid var(--border-color);
  padding: 3rem 0 2rem;
  margin-top: auto;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 2.5rem;
  margin-bottom: 2rem;
}

.footer-link {
  font-size: 1.02rem;
  font-weight: 600;
  color: #475569;
  transition: var(--transition);
  position: relative;
}

.footer-link:hover {
  color: var(--primary);
}

.footer-bottom {
  text-align: center;
  border-top: 1px solid var(--border-color);
  padding-top: 1.75rem;
  font-size: 0.84rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Breadcrumbs */
.breadcrumbs {
  padding: 1rem 0;
  font-size: 0.85rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-color);
}

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

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

.breadcrumbs span.current {
  color: var(--text-main);
  font-weight: 600;
}

/* Article & Content Page Layout */
.content-wrapper {
  padding: 3rem 0 4rem;
}

.article-container {
  max-width: 860px;
  margin: 0 auto;
}

.article-header {
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 2rem;
}

.article-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--primary);
  background: #e0f2fe;
  padding: 0.25rem 0.95rem;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
  border: 1px solid #bae6fd;
  letter-spacing: 0.04em;
}

.article-title {
  font-size: clamp(1.8rem, 3.2vw, 2.5rem);
  font-weight: 800;
  color: #0f172a;
  line-height: 1.3;
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
}

.article-meta-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* Summary Box */
.summary-box {
  background: linear-gradient(135deg, rgba(240, 249, 255, 0.95) 0%, #ffffff 100%);
  border-left: 4px solid var(--primary);
  padding: 1.25rem 1.6rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-bottom: 1.75rem;
  border-top: 1px solid #bae6fd;
  border-right: 1px solid #bae6fd;
  border-bottom: 1px solid #bae6fd;
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.05);
}

.summary-title {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 0.4rem;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.summary-title::before {
  content: "⚡ [SUMMARY_DECRYPTED]";
  color: var(--cyber-neon);
  font-size: 0.75rem;
}

.summary-text {
  font-size: 0.95rem;
  color: #334155;
  line-height: 1.65;
}

/* Inline CTA Box */
.inline-cta-box {
  background: #ffffff;
  border: 1px solid #bae6fd;
  border-radius: var(--radius-md);
  padding: 1.35rem 1.6rem;
  margin: 2rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  box-shadow: 0 4px 16px rgba(2, 132, 199, 0.08);
  transition: var(--transition);
}

.inline-cta-box:hover {
  border-color: #38bdf8;
  box-shadow: 0 8px 24px rgba(2, 132, 199, 0.15), 0 0 12px rgba(14, 165, 233, 0.12);
}

.inline-cta-text h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 0.25rem;
}

.inline-cta-text p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.inline-cta-btn {
  background: var(--accent-gradient);
  color: #ffffff !important;
  font-weight: 700;
  font-size: 0.88rem;
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius-full);
  white-space: nowrap;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(2, 132, 199, 0.3);
  transition: var(--transition);
}

.inline-cta-btn:hover {
  background: var(--accent-gradient-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.4);
}

/* Article Body Typography */
.article-body {
  font-size: 1.02rem;
  line-height: 1.85;
  color: #334155;
}

.article-body h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: #0f172a;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
  letter-spacing: -0.01em;
}

.article-body h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: #0f172a;
  margin: 1.75rem 0 0.75rem;
}

.article-body p {
  margin-bottom: 1.25rem;
}

.article-body ul, .article-body ol {
  margin: 1rem 0 1.5rem 1.5rem;
}

.article-body li {
  margin-bottom: 0.5rem;
}

.article-body strong {
  color: #0f172a;
}

.article-body blockquote {
  background: #f8fafc;
  border-left: 4px solid var(--accent);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 1.5rem 0;
  color: #475569;
  font-style: italic;
  border-top: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.data-table-wrap {
  overflow-x: auto;
  margin: 1.75rem 0;
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
  background: #ffffff;
}

.data-table th {
  background: #f1f5f9;
  color: #0f172a;
  padding: 0.85rem 1.2rem;
  font-weight: 700;
  border-bottom: 1px solid var(--border-color);
}

.data-table td {
  padding: 0.85rem 1.2rem;
  border-bottom: 1px solid var(--border-color);
  color: #334155;
}

.data-table tr:last-child td {
  border-bottom: none;
}

.data-table tr:hover td {
  background: #f8fafc;
}

/* Related Articles / Links */
.related-box {
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.related-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 1.25rem;
}

.related-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  list-style: none;
}

.related-item a {
  display: block;
  background: #ffffff;
  border: 1px solid var(--border-card);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  color: #0f172a;
  font-weight: 600;
  font-size: 0.92rem;
  transition: var(--transition);
  box-shadow: var(--shadow-card);
}

.related-item a:hover {
  border-color: var(--primary);
  background: #f0f9ff;
  color: var(--primary);
}

/* ==========================================================================
   Mobile-First & Comprehensive Responsive Rules (iOS & Android Optimized)
   ========================================================================== */

/* Tablet & Smaller Laptops (<= 1024px) */
@media (max-width: 1024px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }
  .feature-cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .topic-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Tablet & Mobile Header Navigation (<= 960px) */
@media (max-width: 960px) {
  .site-header {
    padding: 0.65rem 0 0.45rem;
  }
  .header-inner {
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "logo cta"
      "nav nav";
    gap: 0.65rem 0.75rem;
    align-items: center;
  }
  .brand-logo {
    grid-area: logo;
  }
  .header-cta-btn {
    grid-area: cta;
    padding: 0.42rem 1.05rem;
    font-size: 0.84rem;
  }
  .nav-menu {
    grid-area: nav;
    display: flex;
    overflow-x: auto;
    white-space: nowrap;
    padding: 0.25rem 0 0.5rem;
    gap: 0.45rem;
    -webkit-overflow-scrolling: touch;
    width: 100%;
    margin: 0;
    scrollbar-width: none;
    -ms-overflow-style: none;
  }
  .nav-menu::-webkit-scrollbar {
    display: none;
  }
  .nav-link {
    font-size: 0.84rem;
    padding: 0.35rem 0.75rem;
    background: #f1f5f9;
    border-radius: var(--radius-full);
    flex-shrink: 0;
  }
  .nav-link.active {
    background: var(--primary);
    color: #ffffff !important;
  }
}

/* Mobile Devices (<= 768px) */
@media (max-width: 768px) {
  /* Tighter Section Vertical Spacing */
  .hero-section {
    padding: 2.75rem 0 2.25rem;
  }
  .pricing-section,
  .feature-section,
  .nav-grid-section,
  .showcase-section,
  .articles-section,
  .faq-section,
  .testimonials-section {
    padding: 2.75rem 0;
  }
  .bottom-cta-section {
    padding: 3rem 0;
  }
  .section-head {
    margin-bottom: 1.75rem;
  }

  /* 1-Column Responsive Grids */
  .pricing-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
  .feature-cards-grid {
    grid-template-columns: 1fr;
    gap: 1.15rem;
  }
  .showcase-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
  .topic-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .articles-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
  .testimonials-grid {
    grid-template-columns: 1fr;
    gap: 1.15rem;
  }
  .related-list {
    grid-template-columns: 1fr;
  }

  /* Hero Section Mobile Tuning */
  .hero-hud-bar {
    font-size: 0.72rem;
    padding: 0.35rem 0.75rem;
    gap: 0.4rem 0.55rem;
  }
  .hero-title {
    font-size: clamp(1.5rem, 5.5vw, 2.1rem);
    line-height: 1.32;
    margin-bottom: 0.85rem;
  }
  .hero-subtitle {
    font-size: 0.95rem;
    line-height: 1.62;
    margin-bottom: 1.5rem;
    padding: 0 0.25rem;
  }
  .hero-trust-badges {
    gap: 0.45rem;
    margin-bottom: 1.75rem;
  }
  .trust-pill {
    font-size: 0.75rem;
    padding: 0.25rem 0.6rem;
  }

  /* Radar Card Mobile */
  .cyber-radar-card {
    border-radius: var(--radius-md);
  }
  .radar-top-bar {
    padding: 0.75rem 1rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.4rem;
  }
  .radar-node-list {
    grid-template-columns: 1fr;
    padding: 0.85rem 1rem;
    gap: 0.65rem;
  }
  .radar-node-item {
    padding: 0.65rem 0.85rem;
  }
  .radar-footer-bar {
    padding: 0.65rem 1rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
    font-size: 0.74rem;
  }

  /* Pricing Cards Mobile */
  .pricing-card {
    padding: 1.5rem 1.25rem;
  }
  .pricing-card.featured {
    order: -1;
  }

  /* Blog & Guide Content */
  .article-header {
    margin-bottom: 1.75rem;
    padding-bottom: 1.25rem;
  }
  .article-title {
    font-size: clamp(1.45rem, 5vw, 2rem);
  }
  .article-meta-bar {
    gap: 0.5rem 0.85rem;
    font-size: 0.78rem;
  }
  .inline-cta-box {
    flex-direction: column;
    text-align: center;
    padding: 1.25rem;
    gap: 1rem;
  }
  .inline-cta-btn {
    width: 100%;
    max-width: 280px;
    text-align: center;
  }
  .article-body {
    font-size: 0.98rem;
    line-height: 1.8;
  }
  .article-body h2 {
    font-size: 1.35rem;
    margin: 2rem 0 0.85rem;
  }
  .article-body h3 {
    font-size: 1.15rem;
    margin: 1.5rem 0 0.65rem;
  }

  /* Mobile Tables */
  .data-table-wrap {
    margin: 1.25rem 0;
    -webkit-overflow-scrolling: touch;
  }
  .data-table {
    min-width: 520px;
    font-size: 0.84rem;
  }
  .data-table th, .data-table td {
    padding: 0.65rem 0.85rem;
  }

  /* Footer & Breadcrumbs */
  .footer-nav {
    gap: 1.25rem 1.75rem;
  }
  .breadcrumbs {
    overflow-x: auto;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding: 0.75rem 0;
  }
  .breadcrumbs::-webkit-scrollbar {
    display: none;
  }
}

/* Compact Mobile Screens (<= 480px, iPhone SE, Android compact) */
@media (max-width: 480px) {
  .container {
    padding: 0 0.95rem;
  }

  /* Header Branding */
  .brand-logo {
    font-size: 1.18rem;
    gap: 0.45rem;
  }
  .logo-icon-img {
    width: 28px;
    height: 28px;
  }
  .logo-badge {
    font-size: 0.65rem;
    padding: 0.15rem 0.4rem;
  }
  .header-cta-btn {
    padding: 0.35rem 0.85rem;
    font-size: 0.8rem;
  }

  /* Hero Section */
  .hero-section {
    padding: 2.25rem 0 1.75rem;
  }
  .hero-hud-bar {
    font-size: 0.68rem;
    padding: 0.3rem 0.6rem;
    line-height: 1.5;
  }
  .hero-brand-badge {
    font-size: 0.75rem;
    padding: 0.22rem 0.7rem;
  }
  .hero-title {
    font-size: 1.45rem;
  }
  .hero-subtitle {
    font-size: 0.88rem;
  }
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
    gap: 0.65rem;
  }
  .hero-cta-cyber,
  .hero-cta-secondary {
    width: 100%;
    max-width: 100%;
    text-align: center;
    justify-content: center;
    padding: 0.78rem 1.5rem;
    font-size: 0.95rem;
  }

  /* Radar Nodes */
  .node-title {
    font-size: 0.84rem;
  }
  .node-sub {
    font-size: 0.7rem;
  }
  .node-badge-flag {
    font-size: 1.3rem;
  }
  .ping-number {
    font-size: 0.72rem;
  }

  /* Bottom CTA */
  .bottom-cta-title {
    font-size: 1.45rem;
  }
  .bottom-cta-desc {
    font-size: 0.9rem;
  }
  .bottom-cta-btn {
    width: 100%;
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
  }

  /* FAQ */
  .faq-item {
    padding: 1.25rem 1rem;
  }
  .faq-question {
    font-size: 0.96rem;
  }
  .faq-answer {
    padding-left: 1.25rem;
    font-size: 0.88rem;
  }

  /* Testimonials */
  .testimonial-card {
    padding: 1.35rem 1rem;
  }
}