/* ==========================================================================
   TNTCloud - High-Altitude Cloudburst Kinetic UI Stylesheet
   Stratospheric Twilight Palette:
   - Dark horizon navy: #0b1325
   - Turbulent cloud-vapor white: #f8fafc
   - Flash-charge amber: #f59e0b
   - Piercing cryogenic sky-cyan: #00f2fe
   Zero generic AI sparks. Aerodynamic titanium airfoil composition.
   ========================================================================== */

:root {
  /* Daytime Mode (Default) - Crisp High-Altitude Cirrus Atmosphere */
  --navy-deep: #0b1325;
  --cloud-white: #f8fafc;
  --amber-charge: #d97706;
  --amber-glow: rgba(217, 119, 6, 0.25);
  --cyan-glow: #0284c7;
  --cyan-piercing: #00f2fe;
  --cyan-halo: rgba(0, 242, 254, 0.18);
  
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-tertiary: #e2e8f0;
  --card-bg: rgba(255, 255, 255, 0.88);
  --card-border: rgba(11, 19, 37, 0.1);
  --card-hover-border: #0284c7;
  --text-primary: #0b1325;
  --text-secondary: #334155;
  --text-muted: #64748b;
  
  --airfoil-gradient: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(241, 245, 249, 0.8) 100%);
  --airfoil-border: linear-gradient(135deg, rgba(2, 132, 199, 0.35) 0%, rgba(217, 119, 6, 0.25) 50%, rgba(11, 19, 37, 0.1) 100%);
  --accent-gradient: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  --kinetic-slipstream: radial-gradient(circle at 50% 0%, rgba(2, 132, 199, 0.12) 0%, transparent 65%);
  
  --nav-bg: rgba(248, 250, 252, 0.85);
  --nav-border: rgba(203, 213, 225, 0.8);
  --header-shadow: 0 4px 20px -2px rgba(11, 19, 37, 0.06);
  --shadow-sm: 0 1px 3px rgba(11, 19, 37, 0.05);
  --shadow-md: 0 6px 16px -2px rgba(11, 19, 37, 0.08);
  --shadow-lg: 0 14px 28px -5px rgba(11, 19, 37, 0.1);
  --shadow-xl: 0 24px 38px -6px rgba(11, 19, 37, 0.14);
  --btn-shadow: 0 8px 24px -4px rgba(2, 132, 199, 0.4);
  --theme-btn-bg: rgba(241, 245, 249, 0.85);
  --theme-btn-border: #cbd5e1;
  --theme-btn-hover: #e2e8f0;
  
  --telemetry-bg: #eff6ff;
  --telemetry-text: #0369a1;
  --telemetry-border: #bae6fd;
  
  --footer-bg: #0b1325;
  --footer-text: #94a3b8;
  --footer-link: #e2e8f0;
  --footer-border: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] {
  /* Nighttime Mode - Stratospheric Twilight Horizon Navy & Cryogenic Sky-Cyan */
  --navy-deep: #0b1325;
  --cloud-white: #f8fafc;
  --amber-charge: #f59e0b;
  --amber-glow: rgba(245, 158, 11, 0.35);
  --cyan-glow: #00f2fe;
  --cyan-piercing: #00f2fe;
  --cyan-halo: rgba(0, 242, 254, 0.28);
  
  --bg-primary: #070c18;
  --bg-secondary: #0b1325;
  --bg-tertiary: #121e38;
  --card-bg: rgba(11, 19, 37, 0.76);
  --card-border: rgba(0, 242, 254, 0.18);
  --card-hover-border: #00f2fe;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #8493ad;
  
  --airfoil-gradient: linear-gradient(135deg, rgba(16, 29, 56, 0.85) 0%, rgba(11, 19, 37, 0.7) 100%);
  --airfoil-border: linear-gradient(135deg, rgba(0, 242, 254, 0.5) 0%, rgba(245, 158, 11, 0.35) 50%, rgba(0, 242, 254, 0.15) 100%);
  --accent-gradient: linear-gradient(135deg, #00f2fe 0%, #0284c7 100%);
  --kinetic-slipstream: radial-gradient(circle at 50% 0%, rgba(0, 242, 254, 0.2) 0%, rgba(11, 19, 37, 0.05) 75%);
  
  --nav-bg: rgba(7, 12, 24, 0.88);
  --nav-border: rgba(0, 242, 254, 0.2);
  --header-shadow: 0 4px 30px -2px rgba(0, 0, 0, 0.5);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 6px 18px -2px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 16px 32px -5px rgba(0, 0, 0, 0.6);
  --shadow-xl: 0 28px 45px -6px rgba(0, 0, 0, 0.7);
  --btn-shadow: 0 8px 28px -4px rgba(0, 242, 254, 0.45);
  --theme-btn-bg: rgba(18, 30, 56, 0.75);
  --theme-btn-border: rgba(0, 242, 254, 0.35);
  --theme-btn-hover: rgba(0, 242, 254, 0.2);
  
  --telemetry-bg: rgba(0, 242, 254, 0.1);
  --telemetry-text: #00f2fe;
  --telemetry-border: rgba(0, 242, 254, 0.3);
  
  --footer-bg: #040812;
  --footer-text: #718096;
  --footer-link: #cbd5e1;
  --footer-border: rgba(0, 242, 254, 0.15);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 86px;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color 0.35s ease, color 0.35s ease;
  overflow-x: hidden;
  position: relative;
}

/* High-Altitude Cloudburst Kinetic Background & Slipstream Canvas */
.bg-mesh {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
  background: 
    radial-gradient(circle at 20% 15%, var(--cyan-halo) 0%, transparent 45%),
    radial-gradient(circle at 80% 40%, var(--amber-glow) 0%, transparent 40%),
    radial-gradient(circle at 50% 90%, rgba(11, 19, 37, 0.08) 0%, transparent 60%);
  transition: opacity 0.4s ease;
}

#slipstreamCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
  opacity: 0.65;
}

/* Container */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Aerodynamic Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 1000;
  background-color: var(--nav-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--nav-border);
  box-shadow: var(--header-shadow);
  transition: background-color 0.35s ease, border-color 0.35s ease;
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.brand-icon {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--cyan-piercing) 0%, #0284c7 100%);
  color: #0b1325;
  border-radius: 10px;
  box-shadow: 0 4px 14px var(--cyan-halo);
}

.brand-highlight {
  background: linear-gradient(135deg, var(--cyan-piercing) 0%, var(--amber-charge) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.6rem;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0.4rem 0.2rem;
  position: relative;
  transition: color 0.25s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--cyan-glow);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--cyan-piercing);
  box-shadow: 0 0 8px var(--cyan-piercing);
  transition: width 0.25s ease;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

/* Theme Toggle Button - Refined, Transparent Glass, Smooth Transitions */
.theme-toggle-btn {
  background: var(--theme-btn-bg);
  border: 1px solid var(--theme-btn-border);
  color: var(--text-primary);
  cursor: pointer;
  border-radius: 50%;
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.theme-toggle-btn:hover {
  background: var(--theme-btn-hover);
  border-color: var(--cyan-glow);
  transform: translateY(-1px) scale(1.05);
  box-shadow: 0 0 12px var(--cyan-halo);
}

.theme-icon-sun,
.theme-icon-moon {
  width: 20px;
  height: 20px;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.25s ease;
}

[data-theme="dark"] .theme-icon-sun {
  display: block;
  color: var(--amber-charge);
}

[data-theme="dark"] .theme-icon-moon {
  display: none;
}

.theme-icon-sun {
  display: none;
}

.theme-icon-moon {
  display: block;
  color: var(--cyan-glow);
}

.mobile-menu-btn {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 0.5rem;
}

/* Streamlined Titanium Airfoil Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.75rem 1.6rem;
  font-size: 0.96rem;
  font-weight: 700;
  border-radius: 12px;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  text-align: center;
  cursor: pointer;
  border: none;
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--cyan-piercing) 0%, #0284c7 100%);
  color: #0b1325 !important;
  box-shadow: var(--btn-shadow);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px -2px var(--cyan-glow);
  filter: brightness(1.08);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--card-bg);
  color: var(--text-primary) !important;
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: var(--bg-tertiary);
  border-color: var(--cyan-glow);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px var(--cyan-halo);
}

.btn-lg {
  padding: 1rem 2.2rem;
  font-size: 1.08rem;
  border-radius: 14px;
}

.btn-block {
  width: 100%;
}

/* Hero Section: High-Altitude Atmospheric Slipstream Composition */
.hero-section {
  padding: 5.5rem 0 4.5rem;
  position: relative;
  text-align: center;
}

.hero-airfoil-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.45rem 1.25rem;
  background: var(--telemetry-bg);
  border: 1px solid var(--telemetry-border);
  border-radius: 9999px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--telemetry-text);
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.5rem;
  backdrop-filter: blur(10px);
}

.ping-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--cyan-piercing);
  position: relative;
}

.ping-indicator::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background-color: var(--cyan-piercing);
  animation: ping 1.5s cubic-bezier(0, 0, 0.2, 1) infinite;
}

@keyframes ping {
  75%, 100% {
    transform: scale(2.4);
    opacity: 0;
  }
}

.hero-headline {
  font-size: clamp(1.4rem, 3.1vw, 2.75rem);
  font-weight: 900;
  line-height: 1.35;
  letter-spacing: -0.02em;
  margin-bottom: 1.4rem;
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  text-align: center;
}

.headline-line {
  display: inline-block;
  white-space: nowrap;
  max-width: 100%;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: var(--text-secondary);
  max-width: 820px;
  margin: 0 auto 1.5rem;
  line-height: 1.7;
}

.hero-intro-text {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto 2.5rem;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}

/* Telemetry Stats Grid (Airfoil Floating Panel) */
.hero-telemetry-panel {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  max-width: 1020px;
  margin: 0 auto;
  padding: 1.8rem;
  background: var(--airfoil-gradient);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  position: relative;
  overflow: hidden;
}

.hero-telemetry-panel::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan-piercing), transparent);
}

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

.stat-value {
  font-size: 2.1rem;
  font-weight: 900;
  color: var(--cyan-glow);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.88rem;
  color: var(--text-muted);
  font-weight: 600;
  margin-top: 0.35rem;
}

/* Generic Section Styles */
.section {
  padding: 5.5rem 0;
  position: relative;
}

.section-alt {
  background-color: var(--bg-secondary);
}

.section-header {
  text-align: center;
  max-width: 740px;
  margin: 0 auto 3.8rem;
}

.section-tag {
  display: inline-block;
  font-size: 0.84rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--cyan-glow);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: clamp(2rem, 3.8vw, 2.7rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1.25;
  margin-bottom: 1rem;
}

.section-desc {
  font-size: 1.08rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Aerodynamic Titanium Airfoil Cards with 3D Z-Axis Tilt & Cryogenic Illumination */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  perspective: 1000px;
}

.adv-card {
  background: var(--airfoil-gradient);
  border: 1px solid var(--card-border);
  border-radius: 24px;
  padding: 2.4rem 2rem;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transform-style: preserve-3d;
  transition: transform 0.3s cubic-bezier(0.2, 0, 0.2, 1), box-shadow 0.3s ease, border-color 0.3s ease;
}

.adv-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border-radius: 24px;
  pointer-events: none;
  box-shadow: inset 0 0 25px transparent;
  transition: box-shadow 0.3s ease;
}

.adv-card:hover {
  transform: translateY(-8px) scale(1.02);
  border-color: var(--cyan-piercing);
  box-shadow: 0 20px 40px -10px var(--cyan-halo), var(--shadow-xl);
}

.adv-card:hover::after {
  box-shadow: inset 0 0 25px var(--cyan-halo);
}

.adv-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.4rem;
}

.adv-card-icon {
  width: 58px;
  height: 58px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--telemetry-bg);
  color: var(--cyan-glow);
  border: 1px solid var(--telemetry-border);
}

.telemetry-pill {
  font-size: 0.76rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: 6px;
  background: var(--telemetry-bg);
  color: var(--telemetry-text);
  border: 1px solid var(--telemetry-border);
}

.adv-card-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.85rem;
}

.adv-card-desc {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.6rem;
  flex-grow: 1;
}

.adv-features-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  list-style: none;
  border-top: 1px solid var(--card-border);
  padding-top: 1.25rem;
}

.adv-feature-row {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.adv-feature-check {
  width: 16px;
  height: 16px;
  color: var(--cyan-glow);
  flex-shrink: 0;
}

/* Spotlight Dual Acceleration Engine (Streaming & AI) */
.spotlight-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.4rem;
}

.spotlight-card {
  background: var(--airfoil-gradient);
  border: 1px solid var(--card-border);
  border-radius: 26px;
  padding: 2.8rem 2.4rem;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
  transition: all 0.3s ease;
}

.spotlight-card:hover {
  transform: translateY(-6px);
  border-color: var(--cyan-piercing);
  box-shadow: 0 16px 36px var(--cyan-halo), var(--shadow-xl);
}

.spotlight-header {
  display: flex;
  align-items: flex-start;
  gap: 1.4rem;
  margin-bottom: 1.6rem;
}

.spotlight-icon-box {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--cyan-piercing) 0%, #0284c7 100%);
  color: #0b1325;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 6px 16px var(--cyan-halo);
}

.spotlight-title {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.spotlight-desc {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.brand-chips-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.85rem;
  margin: 1.8rem 0;
}

.brand-chip {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.8rem 0.95rem;
  background: var(--bg-secondary);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  transition: all 0.2s ease;
}

.brand-chip:hover {
  background: var(--bg-tertiary);
  border-color: var(--cyan-glow);
  transform: scale(1.03);
}

.brand-chip-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
}

.feature-check-list {
  list-style: none;
  margin-top: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.feature-check-item {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-size: 0.94rem;
  color: var(--text-secondary);
}

.feature-check-icon {
  width: 18px;
  height: 18px;
  color: #10b981;
  flex-shrink: 0;
}

/* Realistic Airport / Accelerator Pricing Table */
.pricing-billing-switch {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin: 0 auto 3rem;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  padding: 0.4rem;
  border-radius: 9999px;
  width: fit-content;
}

.billing-toggle-btn {
  padding: 0.6rem 1.4rem;
  border-radius: 9999px;
  font-size: 0.92rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  transition: all 0.25s ease;
}

.billing-toggle-btn.active {
  background: var(--cyan-glow);
  color: #ffffff;
  box-shadow: 0 4px 12px var(--cyan-halo);
}

.discount-badge {
  background: var(--amber-charge);
  color: #ffffff;
  font-size: 0.74rem;
  padding: 0.2rem 0.6rem;
  border-radius: 9999px;
  margin-left: 0.35rem;
  font-weight: 800;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.2rem;
  align-items: stretch;
}

.pricing-card {
  background: var(--airfoil-gradient);
  border: 1px solid var(--card-border);
  border-radius: 26px;
  padding: 2.8rem 2.2rem;
  box-shadow: var(--shadow-md);
  position: relative;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.pricing-card.featured {
  border: 2px solid var(--cyan-piercing);
  box-shadow: 0 16px 36px var(--cyan-halo), var(--shadow-lg);
  background: linear-gradient(180deg, var(--card-bg) 0%, rgba(0, 242, 254, 0.08) 100%);
}

.pricing-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--cyan-piercing) 0%, var(--amber-charge) 100%);
  color: #0b1325;
  font-size: 0.8rem;
  font-weight: 800;
  padding: 0.35rem 1.25rem;
  border-radius: 9999px;
  letter-spacing: 0.06em;
  box-shadow: 0 4px 14px var(--cyan-halo);
  white-space: nowrap;
}

.pricing-tier {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.45rem;
}

.pricing-subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1.6rem;
}

.pricing-price-box {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
  margin-bottom: 1.8rem;
  padding-bottom: 1.6rem;
  border-bottom: 1px solid var(--card-border);
}

.pricing-currency {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--cyan-glow);
}

.pricing-amount {
  font-size: 3.2rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  line-height: 1;
}

.pricing-period {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.pricing-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  margin-bottom: 2.4rem;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.94rem;
  color: var(--text-secondary);
}

.pricing-feature-icon {
  width: 18px;
  height: 18px;
  color: #10b981;
  flex-shrink: 0;
}

.pricing-feature-item.muted {
  color: var(--text-muted);
  opacity: 0.55;
}

/* User Reviews */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.testimonial-card {
  background: var(--airfoil-gradient);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
}

.testimonial-card:hover {
  transform: translateY(-5px);
  border-color: var(--cyan-glow);
  box-shadow: var(--shadow-lg);
}

.testimonial-stars {
  display: flex;
  gap: 0.25rem;
  color: var(--amber-charge);
  margin-bottom: 1rem;
}

.testimonial-text {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.testimonial-user {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  border-top: 1px solid var(--card-border);
  padding-top: 1.1rem;
}

.user-avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.05rem;
  color: #ffffff;
  flex-shrink: 0;
}

.user-avatar-1 { background: linear-gradient(135deg, #0284c7, #0369a1); }
.user-avatar-2 { background: linear-gradient(135deg, #10b981, #047857); }
.user-avatar-3 { background: linear-gradient(135deg, #8b5cf6, #6d28d9); }
.user-avatar-4 { background: linear-gradient(135deg, #f59e0b, #b45309); }
.user-avatar-5 { background: linear-gradient(135deg, #ec4899, #be185d); }
.user-avatar-6 { background: linear-gradient(135deg, #06b6d4, #0e7490); }

.user-meta-name {
  font-size: 0.96rem;
  font-weight: 800;
  color: var(--text-primary);
}

.user-meta-role {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* FAQ Section */
.faq-wrap {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.faq-item {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  overflow: hidden;
  transition: all 0.25s ease;
}

.faq-item:hover {
  border-color: var(--cyan-glow);
}

.faq-item[open] {
  border-color: var(--cyan-piercing);
  box-shadow: 0 4px 16px var(--cyan-halo);
}

.faq-summary {
  list-style: none;
  padding: 1.4rem 1.8rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-primary);
  user-select: none;
}

.faq-summary::-webkit-details-marker {
  display: none;
}

.faq-chevron {
  width: 22px;
  height: 22px;
  color: var(--text-muted);
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

.faq-item[open] .faq-chevron {
  transform: rotate(180deg);
  color: var(--cyan-glow);
}

.faq-answer {
  padding: 0 1.8rem 1.5rem;
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* Bottom CTA Banner */
.cta-banner-section {
  padding: 5rem 0;
}

.cta-banner-card {
  background: linear-gradient(135deg, #0b1325 0%, #102347 100%);
  border: 1px solid rgba(0, 242, 254, 0.3);
  border-radius: 30px;
  padding: 4.5rem 2.5rem;
  text-align: center;
  color: #ffffff;
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 45px rgba(0, 242, 254, 0.2);
}

.cta-banner-title {
  font-size: clamp(2.1rem, 4.2vw, 3rem);
  font-weight: 900;
  margin-bottom: 1.1rem;
}

.cta-banner-desc {
  font-size: 1.2rem;
  max-width: 680px;
  margin: 0 auto 2.4rem;
  color: #cbd5e1;
}

/* Footer - Strictly displays only the 4 required titles */
.site-footer {
  background-color: var(--footer-bg);
  color: var(--footer-text);
  border-top: 1px solid var(--footer-border);
  padding: 3.8rem 0 2.8rem;
  transition: background-color 0.35s ease, border-color 0.35s ease;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 2.2rem;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2.8rem;
  flex-wrap: wrap;
}

.footer-link-title {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--footer-link);
  transition: color 0.2s ease, transform 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 0.85rem;
  border-radius: 10px;
}

.footer-link-title:hover {
  color: var(--cyan-piercing);
  transform: translateY(-2px);
  background: rgba(255, 255, 255, 0.06);
}

.footer-copy {
  font-size: 0.9rem;
  color: var(--footer-text);
  border-top: 1px solid var(--footer-border);
  width: 100%;
  padding-top: 2rem;
}

/* Secondary Page Layouts */
.page-header {
  padding: 5rem 0 2.8rem;
  text-align: center;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--card-border);
}

.page-title {
  font-size: clamp(2.2rem, 4vw, 3rem);
  font-weight: 900;
  margin-bottom: 0.85rem;
  color: var(--text-primary);
}

.page-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 720px;
  margin: 0 auto;
}

.content-box {
  background: var(--airfoil-gradient);
  border: 1px solid var(--card-border);
  border-radius: 24px;
  padding: 3.2rem;
  margin: 3rem auto;
  max-width: 940px;
  box-shadow: var(--shadow-lg);
}

.content-section {
  margin-bottom: 2.8rem;
}

.content-section:last-child {
  margin-bottom: 0;
}

.content-heading {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 1.1rem;
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.content-body {
  font-size: 1.02rem;
  color: var(--text-secondary);
  line-height: 1.85;
}

.content-body p {
  margin-bottom: 1.1rem;
}

.content-body ul {
  padding-left: 1.6rem;
  margin-bottom: 1.1rem;
}

.content-body li {
  margin-bottom: 0.55rem;
}

.back-home-wrap {
  margin-top: 2.8rem;
  text-align: center;
}

/* Responsive Media Queries */
@media (max-width: 992px) {
  .advantages-grid,
  .pricing-grid,
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .spotlight-grid {
    grid-template-columns: 1fr;
  }

  .hero-telemetry-panel {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.4rem;
  }
}

@media (max-width: 768px) {
  .site-header {
    height: auto;
  }

  .nav-wrapper {
    height: 66px;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 66px;
    left: 0;
    width: 100%;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--card-border);
    flex-direction: column;
    padding: 1.6rem 1.6rem 2.2rem;
    gap: 1.25rem;
    box-shadow: var(--shadow-xl);
  }

  .nav-links.active {
    display: flex;
  }

  .mobile-menu-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .advantages-grid,
  .pricing-grid,
  .testimonials-grid {
    grid-template-columns: 1fr;
  }

  .brand-chips-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-section {
    padding: 3.6rem 0 3rem;
  }

  .hero-headline {
    font-size: clamp(1.15rem, 4.3vw, 1.8rem);
    gap: 0.25rem;
  }

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }

  .hero-cta-group .btn {
    width: 100%;
    min-height: 50px;
  }

  .footer-nav {
    flex-direction: column;
    gap: 1.3rem;
  }

  .content-box {
    padding: 2rem 1.4rem;
    margin: 2rem 1rem;
  }

  .btn {
    min-height: 48px;
  }
}

@media (max-width: 480px) {
  .hero-headline {
    font-size: clamp(0.96rem, 4.2vw, 1.25rem);
    gap: 0.2rem;
  }

  .hero-telemetry-panel {
    grid-template-columns: 1fr;
  }

  .brand-chips-grid {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   In-Depth SEO Article Typography & Layout Components
   ========================================================================== */

.article-container {
  max-width: 920px;
  margin: 2.5rem auto 5rem;
  padding: 0 1.5rem;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

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

.breadcrumb a:hover {
  color: var(--cyan-glow);
}

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

.article-title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 900;
  line-height: 1.3;
  color: var(--text-primary);
  margin-bottom: 1.2rem;
  letter-spacing: -0.02em;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.article-meta-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* Table of Contents (TOC) Component */
.article-toc {
  background: var(--airfoil-gradient);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 1.8rem 2rem;
  margin: 2rem 0 3rem;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.article-toc::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--cyan-piercing);
}

.toc-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  padding-left: 0;
}

.toc-item a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all 0.2s ease;
}

.toc-item a:hover {
  color: var(--cyan-glow);
  transform: translateX(4px);
}

/* Article Body Typography */
.article-body {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-secondary);
}

.article-body h2 {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 3rem 0 1.2rem;
  padding-bottom: 0.6rem;
  border-bottom: 2px solid var(--card-border);
  scroll-margin-top: 90px;
}

.article-body h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 2rem 0 1rem;
  scroll-margin-top: 90px;
}

.article-body p {
  margin-bottom: 1.4rem;
}

.article-body ul, .article-body ol {
  padding-left: 1.8rem;
  margin-bottom: 1.5rem;
}

.article-body li {
  margin-bottom: 0.6rem;
}

.article-callout {
  background: var(--telemetry-bg);
  border: 1px solid var(--telemetry-border);
  border-left: 4px solid var(--cyan-glow);
  border-radius: 12px;
  padding: 1.4rem 1.6rem;
  margin: 2rem 0;
  font-size: 0.98rem;
}

.article-callout-amber {
  background: rgba(245, 158, 11, 0.1);
  border-color: rgba(245, 158, 11, 0.3);
  border-left-color: var(--amber-charge);
}

.internal-link {
  color: var(--cyan-glow);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.internal-link:hover {
  color: var(--amber-charge);
}

/* Comparison Table */
.article-table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 2rem 0;
  border-radius: 14px;
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-sm);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.94rem;
  background: var(--card-bg);
}

.article-table th {
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-weight: 700;
  padding: 1rem 1.2rem;
  border-bottom: 2px solid var(--card-border);
  white-space: nowrap;
}

.article-table td {
  padding: 1rem 1.2rem;
  border-bottom: 1px solid var(--card-border);
  color: var(--text-secondary);
}

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

.article-table tr:hover td {
  background: var(--bg-tertiary);
}

/* Code Snippet Block */
.article-code-box {
  background: #0b1325;
  color: #00f2fe;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  padding: 1.2rem 1.4rem;
  border-radius: 12px;
  font-size: 0.9rem;
  line-height: 1.6;
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid rgba(0, 242, 254, 0.2);
}

/* Article In-Page FAQ Block */
.article-faq-section {
  margin: 3.5rem 0 2rem;
  padding: 2.2rem;
  background: var(--airfoil-gradient);
  border: 1px solid var(--card-border);
  border-radius: 20px;
}

/* Related Reading Grid */
.related-posts-section {
  margin: 4rem 0 2rem;
  border-top: 1px solid var(--card-border);
  padding-top: 2.5rem;
}

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

.related-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 1.5rem;
  transition: all 0.25s ease;
  display: flex;
  flex-direction: column;
}

.related-card:hover {
  transform: translateY(-4px);
  border-color: var(--cyan-glow);
  box-shadow: var(--shadow-md);
}

.related-card-title {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.6rem;
  line-height: 1.4;
}

@media (max-width: 768px) {
  .related-posts-grid {
    grid-template-columns: 1fr;
  }
  .article-container {
    padding: 0 1rem;
    margin: 1.8rem auto 3.5rem;
  }
}