/* ==========================================================================
   CloudFox - Stealth-Fox Phased-Array Sonar & Optical-Cloaking Dark UI Stylesheet
   Pure Native CSS | Zero External Dependencies | Blazing Fast Performance
   Zero-Trace Nocturnal Palette: OLED Black (#000000), Carbon Slate (#0b0c0e),
   Sonar-Emerald (#10b981), Acoustic-Cyan (#0284c7), Matte-Silver (#cbd5e1)
   ========================================================================== */

:root {
  /* Day / Light Mode Palette (Default) */
  --bg-primary: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-subtle: #f1f5f9;
  --bg-glass: rgba(255, 255, 255, 0.88);
  --bg-glass-card: rgba(255, 255, 255, 0.92);
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-silver: #334155;
  --text-inverse: #ffffff;
  
  --border-light: #e2e8f0;
  --border-subtle: #cbd5e1;
  --border-focus: #10b981;

  /* Brand Accents */
  --brand-primary: #10b981; /* Sonar Emerald */
  --brand-primary-hover: #059669;
  --brand-accent: #0284c7;  /* Acoustic Cyan */
  --brand-glow: rgba(16, 185, 129, 0.2);
  --brand-cyan-glow: rgba(2, 132, 199, 0.15);
  
  --badge-bg: rgba(16, 185, 129, 0.08);
  --badge-text: #059669;
  --badge-border: rgba(16, 185, 129, 0.25);

  --grid-line: rgba(15, 23, 42, 0.04);
  --sonar-dish-bg: rgba(241, 245, 249, 0.7);
  --sonar-ring: rgba(16, 185, 129, 0.25);
  --sonar-beam: rgba(16, 185, 129, 0.18);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08);
  --shadow-emerald: 0 10px 25px -5px rgba(16, 185, 129, 0.35);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --transition-fast: 0.16s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.45s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-spring: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);

  --container-max: 1240px;
}

/* Zero-Trace Nocturnal Palette (Stealth Fox Dark UI) */
[data-theme="dark"] {
  --bg-primary: #000000;         /* True OLED Pitch Black */
  --bg-surface: #0b0c0e;         /* Stealth Carbon Slate */
  --bg-surface-elevated: #111317;
  --bg-subtle: #14171d;
  --bg-glass: rgba(11, 12, 14, 0.85);
  --bg-glass-card: rgba(11, 12, 14, 0.88);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-silver: #cbd5e1;        /* Monumental Matte-Silver */
  --text-inverse: #000000;

  --border-light: #181b22;
  --border-subtle: #242933;
  --border-focus: #10b981;

  --brand-primary: #10b981;      /* Covert Sonar-Emerald */
  --brand-primary-hover: #34d399;
  --brand-accent: #0284c7;       /* Acoustic-Cyan */
  --brand-glow: rgba(16, 185, 129, 0.28);
  --brand-cyan-glow: rgba(2, 132, 199, 0.22);

  --badge-bg: rgba(16, 185, 129, 0.12);
  --badge-text: #34d399;
  --badge-border: rgba(16, 185, 129, 0.3);

  --grid-line: rgba(255, 255, 255, 0.04);
  --sonar-dish-bg: rgba(11, 12, 14, 0.9);
  --sonar-ring: rgba(16, 185, 129, 0.35);
  --sonar-beam: rgba(16, 185, 129, 0.25);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.6);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.7);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.8);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.9);
  --shadow-emerald: 0 10px 30px -5px rgba(16, 185, 129, 0.45);
}

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

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

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 var(--transition-smooth), color var(--transition-smooth);
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* Optical-Cloaking Micro-Grid Canvas & Refraction Light */
.stealth-canvas-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  background-image: 
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 28px 28px;
}

/* Optical Cloaking Spotlight that bends over the micro-grid */
.stealth-spotlight {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  background: radial-gradient(
    circle 320px at var(--mouse-x, 50%) var(--mouse-y, 35%),
    rgba(16, 185, 129, 0.07),
    rgba(2, 132, 199, 0.04) 40%,
    transparent 80%
  );
  transition: opacity 0.3s ease;
}

[data-theme="dark"] .stealth-spotlight {
  background: radial-gradient(
    circle 360px at var(--mouse-x, 50%) var(--mouse-y, 35%),
    rgba(16, 185, 129, 0.12),
    rgba(2, 132, 199, 0.08) 45%,
    transparent 85%
  );
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
  position: relative;
  z-index: 1;
}

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

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ==========================================================================
   Navigation Bar
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
  transition: background-color var(--transition-smooth), border-color var(--transition-smooth);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.brand-logo:hover {
  opacity: 0.92;
  transform: translateY(-1px);
}

.brand-icon {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, #10b981 0%, #059669 50%, #0284c7 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.4);
  flex-shrink: 0;
}

.brand-wordmark {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 1.45rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  line-height: 1;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.8rem;
  list-style: none;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 0.45rem 0;
  transition: color var(--transition-fast);
}

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

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--brand-primary);
  transition: width var(--transition-fast);
  border-radius: 2px;
}

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

/* Special highlight for the newly added '推荐资讯' item */
.nav-link-news {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-primary);
  font-weight: 600;
}

.nav-link-news .news-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 8px #10b981;
  animation: pulse-emerald 2s infinite;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

/* Translucent Frosted Glass Day/Night Theme Toggle */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: rgba(148, 163, 184, 0.12);
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.theme-toggle-btn:hover {
  background: rgba(148, 163, 184, 0.22);
  border-color: var(--border-subtle);
  transform: translateY(-1px);
}

.theme-icon-sun,
.theme-icon-moon {
  position: absolute;
  width: 19px;
  height: 19px;
  transition: transform var(--transition-smooth), opacity var(--transition-smooth);
}

[data-theme="light"] .theme-icon-sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
  color: #d97706;
}
[data-theme="light"] .theme-icon-moon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}

[data-theme="dark"] .theme-icon-sun {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}
[data-theme="dark"] .theme-icon-moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
  color: #34d399;
}

/* Mobile Nav Toggle */
.mobile-menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: rgba(148, 163, 184, 0.1);
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  align-items: center;
  justify-content: center;
}

/* ==========================================================================
   Buttons & Stealth Micro-Interactions
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0.72rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-align: center;
  white-space: nowrap;
  transition: all var(--transition-normal);
  line-height: 1.25;
  cursor: pointer;
  text-decoration: none;
  min-height: 46px;
  position: relative;
  overflow: hidden;
}

/* Emerald Pill ("注册 / 登录") */
.btn-emerald {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: #ffffff;
  box-shadow: 0 4px 16px rgba(16, 185, 129, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn-emerald:hover {
  background: linear-gradient(135deg, #34d399 0%, #059669 100%);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(16, 185, 129, 0.45);
}

/* Shielded Pill ("匿名购买") with Biometric Shield-Lock Animation */
.btn-shielded {
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-spring);
}

.btn-shielded .shield-icon-svg {
  color: var(--brand-primary);
  transition: transform var(--transition-spring), color var(--transition-fast);
}

.btn-shielded::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(16, 185, 129, 0.15), transparent);
  transition: none;
}

.btn-shielded:hover {
  transform: translateY(-2px) scale(1.02);
  border-color: #10b981;
  box-shadow: 0 8px 22px rgba(16, 185, 129, 0.25), inset 0 0 12px rgba(16, 185, 129, 0.1);
  color: var(--brand-primary);
}

.btn-shielded:hover .shield-icon-svg {
  transform: scale(1.18) rotate(4deg);
  color: #34d399;
}

.btn-shielded:hover::after {
  left: 100%;
  transition: left 0.75s ease-in-out;
}

.btn-lg {
  padding: 0.92rem 2.2rem;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
  font-weight: 700;
  min-height: 52px;
}

.btn-full {
  width: 100%;
}

.btn-secondary {
  background: var(--bg-subtle);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
}

.btn-secondary:hover {
  background: var(--bg-surface-elevated);
  border-color: var(--border-subtle);
  transform: translateY(-1px);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 0.38rem 0.95rem;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  background: var(--badge-bg);
  color: var(--badge-text);
  border: 1px solid var(--badge-border);
  letter-spacing: 0.02em;
}

.badge-pulse::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #10b981;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulse-emerald 2s infinite;
}

@keyframes pulse-emerald {
  0% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  }
  70% {
    transform: scale(1);
    box-shadow: 0 0 0 8px rgba(16, 185, 129, 0);
  }
  100% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
  }
}

/* ==========================================================================
   Hero Section - Asymmetric Covert Telemetry Layout
   ========================================================================== */
.hero-section {
  padding: 4.5rem 0 3rem;
  position: relative;
}

.hero-grid-asym {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-left {
  text-align: left;
}

.hero-badge-wrap {
  margin-bottom: 1.5rem;
}

/* Monumental Matte-Silver Headline with Brand Name */
.hero-brand-tag {
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--brand-primary);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.hero-monumental-title {
  font-size: clamp(2.4rem, 5.2vw, 4.2rem);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.04em;
  color: var(--text-silver);
  margin-bottom: 1.35rem;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.hero-monumental-title .brand-callout {
  display: block;
  background: linear-gradient(135deg, #10b981 0%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-size: clamp(2.6rem, 5.8vw, 4.6rem);
}

.hero-desc {
  font-size: clamp(1.02rem, 1.8vw, 1.18rem);
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 580px;
  margin-bottom: 2.25rem;
}

.hero-cta-pills {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

/* ==========================================================================
   Right Canvas: Phased-Array Sonar Radar Dish
   ========================================================================== */
.sonar-canvas-card {
  position: relative;
  width: 100%;
  max-width: 440px;
  aspect-ratio: 1 / 1;
  margin: 0 auto;
  border-radius: 50%;
  background: var(--sonar-dish-bg);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-xl), inset 0 0 40px rgba(16, 185, 129, 0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* Phased-Array Concentric Pulse Rings */
.sonar-ring-elem {
  position: absolute;
  border-radius: 50%;
  border: 1px solid var(--sonar-ring);
  pointer-events: none;
}

.ring-1 { width: 30%; height: 30%; }
.ring-2 { width: 55%; height: 55%; border-style: dashed; }
.ring-3 { width: 80%; height: 80%; }
.ring-4 { width: 100%; height: 100%; border-width: 2px; }

/* Dynamic Concentric Acoustic Pulse Wave */
.sonar-pulse-wave {
  position: absolute;
  width: 20%;
  height: 20%;
  border-radius: 50%;
  border: 2px solid #10b981;
  opacity: 0.8;
  animation: acoustic-pulse 3.6s cubic-bezier(0.2, 0.8, 0.4, 1) infinite;
  pointer-events: none;
}

.pulse-wave-2 {
  animation-delay: 1.8s;
}

@keyframes acoustic-pulse {
  0% {
    width: 10%;
    height: 10%;
    opacity: 0.9;
    border-color: #10b981;
  }
  50% {
    border-color: #0284c7;
  }
  100% {
    width: 105%;
    height: 105%;
    opacity: 0;
    border-color: #0284c7;
  }
}

/* Radar Rotating Sweep Beam */
.sonar-sweep-beam {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 50%;
  height: 50%;
  transform-origin: 0% 0%;
  background: conic-gradient(
    from 0deg at 0% 0%,
    rgba(16, 185, 129, 0.35) 0deg,
    rgba(2, 132, 199, 0.15) 30deg,
    transparent 60deg
  );
  animation: radar-sweep 5s linear infinite;
  pointer-events: none;
}

@keyframes radar-sweep {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Crosshair Grid Lines */
.sonar-cross-h, .sonar-cross-v {
  position: absolute;
  background: var(--sonar-ring);
  opacity: 0.35;
  pointer-events: none;
}
.sonar-cross-h { width: 100%; height: 1px; top: 50%; left: 0; }
.sonar-cross-v { height: 100%; width: 1px; left: 50%; top: 0; }

/* Radar Node Blips */
.sonar-node {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--text-primary);
  background: var(--bg-surface-elevated);
  padding: 3px 8px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-light);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
  z-index: 2;
  white-space: nowrap;
}

.node-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 6px #10b981;
  animation: pulse-emerald 2s infinite;
}

.sonar-node-hk { top: 26%; left: 22%; }
.sonar-node-jp { top: 22%; right: 18%; }
.sonar-node-sg { bottom: 26%; left: 28%; }
.sonar-node-us { bottom: 32%; right: 15%; }

/* Sonar Center Origin Core */
.sonar-center-core {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 16px #10b981;
  z-index: 3;
}

/* ==========================================================================
   Bento Telemetry Module (Bottom Hero)
   ========================================================================== */
.bento-telemetry-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  margin-top: 2rem;
}

.bento-cell {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.35rem;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.bento-cell:hover {
  transform: translateY(-3px);
  border-color: var(--brand-primary);
  box-shadow: var(--shadow-md), 0 0 18px var(--brand-glow);
}

.bento-cell-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.bento-label {
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.bento-badge-mini {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  background: var(--badge-bg);
  color: var(--brand-primary);
}

.bento-value-huge {
  font-size: 2.2rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--brand-primary);
}

.bento-value-huge .unit {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-left: 2px;
}

.bento-subtext {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 6px;
}

/* ==========================================================================
   Section Headers
   ========================================================================== */
.section {
  padding: 5.5rem 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 3.5rem;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--brand-primary);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: clamp(1.85rem, 3.5vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  line-height: 1.25;
  margin-bottom: 1rem;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ==========================================================================
   Product Core Advantages (3 Image/Icon Cards)
   ========================================================================== */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.adv-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2.35rem 2rem;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.adv-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, #10b981, #0284c7);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.adv-card:hover {
  transform: translateY(-5px);
  border-color: var(--brand-primary);
  box-shadow: var(--shadow-xl), 0 0 25px var(--brand-glow);
}

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

.adv-icon-wrap {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  background: var(--badge-bg);
  color: var(--brand-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  transition: transform var(--transition-normal);
}

.adv-card:hover .adv-icon-wrap {
  transform: scale(1.08);
}

.adv-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.adv-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

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

.adv-specs li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.adv-specs li svg {
  color: #10b981;
  flex-shrink: 0;
}

/* ==========================================================================
   Showcase Cards: Streaming & AI Support Cards
   ========================================================================== */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.5rem;
}

.showcase-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2.75rem 2.25rem;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.showcase-card:hover {
  transform: translateY(-4px);
  border-color: var(--brand-primary);
  box-shadow: var(--shadow-xl), 0 0 25px var(--brand-glow);
}

.showcase-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.showcase-icon-badge {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.icon-streaming {
  background: rgba(239, 68, 68, 0.12);
  color: #ef4444;
}

.icon-ai {
  background: rgba(16, 185, 129, 0.12);
  color: #10b981;
}

.showcase-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.6rem;
}

.showcase-subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 2rem;
}

.service-pills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.85rem;
  margin-bottom: 2rem;
}

.service-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0.65rem 0.85rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.service-pill:hover {
  border-color: var(--brand-primary);
  background: var(--badge-bg);
  color: var(--brand-primary);
  transform: translateY(-2px);
}

.showcase-metrics {
  background: var(--bg-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: auto;
  border: 1px solid var(--border-light);
}

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

.metric-val {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--brand-primary);
}

.metric-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ==========================================================================
   Pricing Table - Real World Airport Pricing
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  align-items: stretch;
}

.price-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2.75rem 2rem 2.25rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.price-card:hover {
  transform: translateY(-6px);
  border-color: var(--brand-primary);
  box-shadow: var(--shadow-xl);
}

.price-card.featured {
  border: 2px solid var(--brand-primary);
  box-shadow: var(--shadow-xl), 0 0 32px var(--brand-glow);
  transform: scale(1.03);
  z-index: 2;
}

.price-card.featured:hover {
  transform: scale(1.03) translateY(-6px);
}

.popular-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.32rem 1.35rem;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.45);
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.plan-header {
  text-align: center;
  margin-bottom: 1.25rem;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.plan-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.plan-price-wrap {
  text-align: center;
  padding: 1.25rem 0;
  margin-bottom: 1.75rem;
  border-top: 1px dashed var(--border-light);
  border-bottom: 1px dashed var(--border-light);
}

.price-currency {
  font-size: 1.35rem;
  font-weight: 700;
  vertical-align: top;
  margin-right: 2px;
  color: var(--brand-primary);
}

.price-amount {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

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

.plan-saving-tip {
  font-size: 0.82rem;
  color: #10b981;
  font-weight: 600;
  margin-top: 6px;
}

.plan-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-bottom: 2.25rem;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.plan-features li svg {
  color: #10b981;
  flex-shrink: 0;
  margin-top: 2px;
}

.plan-features li.disabled {
  color: var(--text-muted);
  opacity: 0.6;
}

.plan-features li.disabled svg {
  color: var(--text-muted);
}

/* ==========================================================================
   User Testimonials (Reviews)
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.review-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: var(--brand-primary);
  box-shadow: var(--shadow-lg);
}

.review-stars {
  display: flex;
  gap: 4px;
  color: #fbbf24;
  margin-bottom: 1rem;
}

.review-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1.5rem;
  flex-grow: 1;
  font-style: italic;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 1rem;
  border-top: 1px solid var(--border-light);
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #10b981 0%, #0284c7 100%);
  color: #fff;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.author-info {
  display: flex;
  flex-direction: column;
}

.author-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.author-title {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ==========================================================================
   FAQ Section
   ========================================================================== */
.faq-container {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-fast);
}

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

.faq-question {
  width: 100%;
  padding: 1.35rem 1.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
  background: none;
  border: none;
}

.faq-icon {
  width: 22px;
  height: 22px;
  color: var(--text-muted);
  transition: transform var(--transition-normal);
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
  color: var(--brand-primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-smooth), padding var(--transition-smooth);
  padding: 0 1.75rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  padding-bottom: 1.35rem;
}

/* ==========================================================================
   Footer
   Strict requirement: Only the 4 specified titles!
   ========================================================================== */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-light);
  padding: 3.5rem 0 2.5rem;
  margin-top: 4rem;
  transition: background-color var(--transition-smooth), border-color var(--transition-smooth);
}

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

.footer-link {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-secondary);
  position: relative;
  padding: 0.4rem 0.2rem;
  transition: color var(--transition-fast);
}

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

.footer-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--brand-primary);
  transition: width var(--transition-fast);
}

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

.footer-bottom {
  text-align: center;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border-light);
  color: var(--text-muted);
  font-size: 0.88rem;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* Subpage Specific Layout */
.subpage-header {
  padding: 4rem 0 2rem;
  border-bottom: 1px solid var(--border-light);
  background: var(--bg-surface);
}

.subpage-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.subpage-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
}

.subpage-body {
  padding: 3.5rem 0 5rem;
  max-width: 880px;
  margin: 0 auto;
}

.subpage-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 2rem;
}

.subpage-card h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.subpage-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 1.5rem 0 0.5rem;
}

.subpage-card p {
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 1rem;
  font-size: 0.98rem;
}

.subpage-card ul, .subpage-card ol {
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

.subpage-card li {
  margin-bottom: 0.5rem;
}

.highlight-box {
  background: var(--badge-bg);
  border-left: 4px solid var(--brand-primary);
  padding: 1.25rem 1.5rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 1.5rem 0;
  color: var(--text-primary);
  font-weight: 500;
}

.warning-box {
  background: rgba(239, 68, 68, 0.08);
  border-left: 4px solid #ef4444;
  padding: 1.25rem 1.5rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 1.5rem 0;
  color: var(--text-primary);
}

.back-to-home-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--brand-primary);
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.back-to-home-link:hover {
  text-decoration: underline;
}

/* ==========================================================================
   Article & Insights Hub Specific Styles
   ========================================================================== */
.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-top: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-light);
}

.article-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* Table of Contents (TOC) */
.article-toc {
  background: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-left: 4px solid var(--brand-primary);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.75rem;
  margin: 2rem 0;
}

.article-toc-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 1rem;
}

.article-toc-list {
  list-style: none;
  padding-left: 0;
  margin-bottom: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.article-toc-link {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.article-toc-link::before {
  content: "›";
  color: var(--brand-primary);
  font-weight: 700;
  font-size: 1.1rem;
}

.article-toc-link:hover {
  color: var(--brand-primary);
  transform: translateX(4px);
}

/* In-Article Internal Link Highlighting */
.article-inline-link {
  color: var(--brand-primary);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition-fast);
}

.article-inline-link:hover {
  color: var(--brand-primary-hover);
}

/* Related Reading Section */
.related-reading-box {
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-light);
}

.related-reading-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.related-reading-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.related-reading-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.35rem;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  text-decoration: none;
}

.related-reading-card:hover {
  border-color: var(--brand-primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md), 0 0 16px var(--brand-glow);
}

.related-card-tag {
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--brand-primary);
  margin-bottom: 0.4rem;
}

.related-card-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.45;
  margin-bottom: 0.4rem;
}

.related-card-date {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: auto;
}

/* Insights Hub Grid for insights-k8f2.html */
.insights-hub-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem;
  margin-top: 2rem;
}

.insight-hub-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.insight-hub-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, #10b981, #0284c7);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.insight-hub-card:hover {
  transform: translateY(-4px);
  border-color: var(--brand-primary);
  box-shadow: var(--shadow-xl), 0 0 20px var(--brand-glow);
}

.insight-hub-card:hover::before {
  opacity: 1;
}

.insight-card-badges {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.insight-card-title {
  font-size: 1.28rem;
  font-weight: 800;
  line-height: 1.35;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.insight-card-title a {
  color: inherit;
}

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

.insight-card-excerpt {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

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

.read-more-link {
  color: var(--brand-primary);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.read-more-link:hover {
  text-decoration: underline;
}

/* ==========================================================================
   Responsive Adaptations (@media)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid-asym {
    grid-template-columns: 1fr;
    text-align: center;
  }

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

  .hero-brand-tag {
    justify-content: center;
  }

  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-cta-pills {
    justify-content: center;
  }

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

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

  .price-card.featured {
    transform: none;
    order: -1;
    grid-column: span 2;
  }

  .price-card.featured:hover {
    transform: translateY(-6px);
  }

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

@media (max-width: 768px) {
  .hero-section {
    padding: 3rem 0 2rem;
  }

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

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

  .price-card.featured {
    grid-column: span 1;
  }

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

  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-light);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1.25rem;
    box-shadow: var(--shadow-lg);
  }

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

  .mobile-menu-btn {
    display: inline-flex;
  }

  .footer-nav {
    flex-direction: column;
    gap: 1.25rem;
  }

  .btn-lg {
    width: 100%;
  }

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

  .hero-cta-pills .btn {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .service-pills-grid {
    grid-template-columns: 1fr;
  }

  .showcase-metrics {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }
}