/* ==========================================================================
   Proton VPN - Global Stylesheet
   Domain: protondvpn.com.cn
   Version: 1.0.0
   ========================================================================== */

/* ---------- CSS Custom Properties (Design Tokens) ---------- */
:root {
  /* Brand Colors */
  --color-primary: #6D4AFF;
  --color-primary-hover: #5a38e0;
  --color-primary-light: #8b6fff;
  --color-accent: #1FC5C9;
  --color-gradient-start: #6D4AFF;
  --color-gradient-end: #1FC5C9;

  /* Dark Theme */
  --color-dark-bg: #1C1B22;
  --color-dark-card: #25242E;
  --color-dark-text: #EAEAEA;
  --color-dark-text-muted: #A0A0A8;
  --color-dark-border: #3A3944;

  /* Light Theme */
  --color-light-bg: #FFFFFF;
  --color-light-card: #F7F7FA;
  --color-light-text: #1C1B22;
  --color-light-text-muted: #6B6B76;
  --color-light-border: #E5E5EA;

  /* Semantic Colors */
  --color-success: #1EA885;
  --color-error: #E5484D;
  --color-warning: #F5A623;
  --color-info: #3B82F6;

  /* Typography */
  --font-family: 'Inter', 'SF Pro Text', 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;

  /* Spacing */
  --max-width: 1200px;
  --padding-desktop: 32px;
  --padding-mobile: 20px;
  --section-spacing: 80px;
  --section-spacing-lg: 120px;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;

  /* Z-index */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 300;
  --z-modal: 400;
}

/* ---------- Reset & Base ---------- */
*,
*::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: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-light-text);
  background-color: var(--color-light-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

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

a:focus-visible,
button:focus-visible,
summary:focus-visible,
details:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 700;
  color: inherit;
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

p {
  margin-bottom: 1rem;
}

/* ---------- Utility Classes ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--padding-mobile);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.text-center { text-align: center; }
.text-gradient {
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: var(--font-size-base);
  font-weight: 600;
  line-height: 1.4;
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: all var(--transition-base);
  cursor: pointer;
  border: 2px solid transparent;
  white-space: nowrap;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  color: #FFFFFF;
  border-color: transparent;
  box-shadow: 0 4px 14px rgba(109, 74, 255, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(109, 74, 255, 0.45);
  color: #FFFFFF;
}

.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-secondary:hover {
  background: var(--color-primary);
  color: #FFFFFF;
  transform: translateY(-2px);
}

.btn-white {
  background: #FFFFFF;
  color: var(--color-primary);
  border-color: #FFFFFF;
}

.btn-white:hover {
  background: transparent;
  color: #FFFFFF;
  border-color: #FFFFFF;
  transform: translateY(-2px);
}

.btn-outline-white {
  background: transparent;
  color: #FFFFFF;
  border-color: rgba(255, 255, 255, 0.5);
}

.btn-outline-white:hover {
  background: #FFFFFF;
  color: var(--color-primary);
  border-color: #FFFFFF;
}

.btn-sm {
  padding: 8px 20px;
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: 16px 36px;
  font-size: var(--font-size-lg);
}

/* ---------- Sticky Navigation ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  transition: all var(--transition-base);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 16px;
}

.site-logo {
  font-size: var(--font-size-xl);
  font-weight: 800;
  color: var(--color-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.site-logo:hover {
  color: var(--color-primary-hover);
}

.site-logo .logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  font-weight: 900;
  font-size: var(--font-size-sm);
}

.main-nav {
  display: none;
}

.main-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
}

.main-nav a {
  display: block;
  padding: 8px 16px;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-light-text);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.main-nav a:hover {
  color: var(--color-primary);
  background: rgba(109, 74, 255, 0.06);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.lang-switcher {
  display: none;
  padding: 6px 12px;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-light-text-muted);
  border: 1px solid var(--color-light-border);
  border-radius: var(--radius-md);
  text-decoration: none;
}

.lang-switcher:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.header-cta {
  display: none;
}

.header-cta .btn {
  font-size: var(--font-size-sm);
  padding: 8px 18px;
}

/* Mobile menu toggle */
.mobile-menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  background: none;
  cursor: pointer;
  border-radius: var(--radius-md);
}

.mobile-menu-toggle:hover {
  background: var(--color-light-card);
}

.mobile-menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-light-text);
  position: relative;
}

.mobile-menu-toggle span::before,
.mobile-menu-toggle span::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 2px;
  background: var(--color-light-text);
  left: 0;
}

.mobile-menu-toggle span::before { top: -6px; }
.mobile-menu-toggle span::after { top: 6px; }

/* ---------- Hero Section ---------- */
.hero {
  position: relative;
  background: linear-gradient(135deg, #1C1B22 0%, #2D1B69 30%, #6D4AFF 60%, #1FC5C9 100%);
  padding: 100px 0 80px;
  overflow: hidden;
  color: #FFFFFF;
}

/* Decorative particle/network effect using CSS gradients */
.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(109, 74, 255, 0.3) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(31, 197, 201, 0.25) 0%, transparent 40%),
    radial-gradient(circle at 50% 70%, rgba(109, 74, 255, 0.2) 0%, transparent 45%),
    radial-gradient(circle at 10% 80%, rgba(31, 197, 201, 0.15) 0%, transparent 35%),
    radial-gradient(circle at 90% 60%, rgba(109, 74, 255, 0.2) 0%, transparent 30%),
    radial-gradient(circle 2px at 30% 20%, rgba(255, 255, 255, 0.4) 0%, transparent 100%),
    radial-gradient(circle 2px at 70% 40%, rgba(255, 255, 255, 0.3) 0%, transparent 100%),
    radial-gradient(circle 2px at 50% 60%, rgba(255, 255, 255, 0.35) 0%, transparent 100%),
    radial-gradient(circle 2px at 20% 70%, rgba(255, 255, 255, 0.25) 0%, transparent 100%),
    radial-gradient(circle 2px at 85% 80%, rgba(255, 255, 255, 0.3) 0%, transparent 100%),
    radial-gradient(circle 1px at 40% 15%, rgba(255, 255, 255, 0.5) 0%, transparent 100%),
    radial-gradient(circle 1px at 60% 85%, rgba(255, 255, 255, 0.4) 0%, transparent 100%),
    radial-gradient(circle 1px at 15% 50%, rgba(255, 255, 255, 0.45) 0%, transparent 100%),
    radial-gradient(circle 1px at 90% 30%, rgba(255, 255, 255, 0.35) 0%, transparent 100%);
  pointer-events: none;
  z-index: 0;
}

/* Network lines effect */
.hero::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    linear-gradient(45deg, transparent 48%, rgba(255, 255, 255, 0.03) 49%, rgba(255, 255, 255, 0.03) 51%, transparent 52%),
    linear-gradient(-30deg, transparent 48%, rgba(255, 255, 255, 0.02) 49%, rgba(255, 255, 255, 0.02) 51%, transparent 52%),
    linear-gradient(70deg, transparent 48%, rgba(31, 197, 201, 0.03) 49%, rgba(31, 197, 201, 0.03) 51%, transparent 52%);
  background-size: 200px 200px, 300px 300px, 250px 250px;
  pointer-events: none;
  z-index: 0;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.hero h1 {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  margin-bottom: 24px;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 40px;
  line-height: 1.7;
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta-group {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
  margin-bottom: 40px;
}

.hero-cta-group .btn {
  min-width: 220px;
}

.hero-trust {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.7);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 20px;
}

.hero-trust span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.hero-trust span::before {
  content: '·';
  color: rgba(255, 255, 255, 0.4);
}

.hero-trust span:first-child::before {
  display: none;
}

/* ---------- Trust Badge Bar ---------- */
.trust-badge-bar {
  background: var(--color-light-card);
  border-top: 1px solid var(--color-light-border);
  border-bottom: 1px solid var(--color-light-border);
  padding: 32px 0;
}

.trust-badges {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  text-align: center;
}

.trust-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.trust-badge-icon {
  font-size: 2rem;
  line-height: 1;
}

.trust-badge-text {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-light-text);
}

/* ---------- Section Common ---------- */
.section {
  padding: var(--section-spacing) 0;
}

.section-dark {
  background: var(--color-dark-bg);
  color: var(--color-dark-text);
}

.section-alt {
  background: var(--color-light-card);
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 48px;
}

.section-header h2 {
  margin-bottom: 16px;
}

.section-header p {
  color: var(--color-light-text-muted);
  font-size: var(--font-size-lg);
}

.section-dark .section-header p {
  color: var(--color-dark-text-muted);
}

/* ---------- Feature Cards Grid ---------- */
.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.feature-card {
  background: var(--color-light-card);
  border: 1px solid var(--color-light-border);
  border-radius: var(--radius-xl);
  padding: 32px;
  transition: all var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: rgba(109, 74, 255, 0.2);
}

.feature-card-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, rgba(109, 74, 255, 0.1), rgba(31, 197, 201, 0.1));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: var(--font-size-xl);
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--color-light-text-muted);
  font-size: var(--font-size-sm);
  line-height: 1.7;
  margin-bottom: 16px;
}

.feature-card .card-link {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.feature-card .card-link:hover {
  gap: 8px;
}

/* ---------- Global Server Network Section ---------- */
.server-network {
  position: relative;
  overflow: hidden;
}

.server-map-visual {
  position: relative;
  width: 100%;
  max-width: 900px;
  height: 300px;
  margin: 0 auto 48px;
  border-radius: var(--radius-xl);
  background:
    radial-gradient(ellipse at 50% 50%, rgba(109, 74, 255, 0.08) 0%, transparent 70%),
    linear-gradient(180deg, var(--color-dark-bg) 0%, #1a1925 100%);
  border: 1px solid var(--color-dark-border);
  overflow: hidden;
}

/* Decorative world map dots */
.server-map-visual::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80%;
  height: 70%;
  background:
    /* Americas */
    radial-gradient(circle 4px at 20% 40%, rgba(109, 74, 255, 0.8) 0%, transparent 100%),
    radial-gradient(circle 3px at 22% 55%, rgba(31, 197, 201, 0.7) 0%, transparent 100%),
    radial-gradient(circle 3px at 25% 35%, rgba(109, 74, 255, 0.6) 0%, transparent 100%),
    radial-gradient(circle 4px at 18% 60%, rgba(31, 197, 201, 0.8) 0%, transparent 100%),
    /* Europe */
    radial-gradient(circle 4px at 48% 30%, rgba(109, 74, 255, 0.9) 0%, transparent 100%),
    radial-gradient(circle 3px at 52% 28%, rgba(31, 197, 201, 0.7) 0%, transparent 100%),
    radial-gradient(circle 3px at 50% 35%, rgba(109, 74, 255, 0.6) 0%, transparent 100%),
    radial-gradient(circle 4px at 55% 32%, rgba(31, 197, 201, 0.8) 0%, transparent 100%),
    /* Asia */
    radial-gradient(circle 3px at 70% 35%, rgba(109, 74, 255, 0.7) 0%, transparent 100%),
    radial-gradient(circle 4px at 75% 40%, rgba(31, 197, 201, 0.8) 0%, transparent 100%),
    radial-gradient(circle 3px at 80% 45%, rgba(109, 74, 255, 0.6) 0%, transparent 100%),
    radial-gradient(circle 3px at 65% 50%, rgba(31, 197, 201, 0.7) 0%, transparent 100%),
    /* Africa */
    radial-gradient(circle 3px at 50% 55%, rgba(109, 74, 255, 0.6) 0%, transparent 100%),
    radial-gradient(circle 3px at 53% 65%, rgba(31, 197, 201, 0.5) 0%, transparent 100%),
    /* Oceania */
    radial-gradient(circle 3px at 82% 70%, rgba(109, 74, 255, 0.7) 0%, transparent 100%),
    radial-gradient(circle 3px at 85% 65%, rgba(31, 197, 201, 0.6) 0%, transparent 100%);
}

/* Pulsing glow effect */
.server-map-visual::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60%;
  height: 60%;
  background: radial-gradient(circle, rgba(109, 74, 255, 0.15) 0%, transparent 60%);
  border-radius: 50%;
}

.server-stats {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.server-stat-number {
  font-size: var(--font-size-5xl);
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.server-stat-label {
  font-size: var(--font-size-lg);
  color: var(--color-dark-text-muted);
}

.server-description {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 32px;
  color: var(--color-dark-text-muted);
}

/* ---------- Multi-Platform Support ---------- */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}

.platform-item {
  background: var(--color-light-card);
  border: 1px solid var(--color-light-border);
  border-radius: var(--radius-lg);
  padding: 24px 16px;
  text-align: center;
  transition: all var(--transition-base);
}

.platform-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.platform-icon {
  font-size: 2rem;
  margin-bottom: 8px;
}

.platform-name {
  font-weight: 600;
  font-size: var(--font-size-sm);
  color: var(--color-light-text);
}

.platform-extra {
  text-align: center;
  color: var(--color-light-text-muted);
  font-size: var(--font-size-sm);
  margin-bottom: 24px;
}

/* ---------- Deep Security Section ---------- */
.security-section {
  background: var(--color-dark-bg);
  color: var(--color-dark-text);
}

.security-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}

.security-features {
  list-style: none;
}

.security-features li {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-dark-border);
}

.security-features li:last-child {
  border-bottom: none;
}

.security-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, rgba(109, 74, 255, 0.2), rgba(31, 197, 201, 0.2));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.2rem;
}

.security-text h4 {
  font-size: var(--font-size-base);
  margin-bottom: 4px;
  color: var(--color-dark-text);
}

.security-text p {
  font-size: var(--font-size-sm);
  color: var(--color-dark-text-muted);
  margin-bottom: 0;
}

.security-visual {
  position: relative;
  height: 250px;
  background: linear-gradient(135deg, rgba(109, 74, 255, 0.1), rgba(31, 197, 201, 0.1));
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-dark-border);
  display: flex;
  align-items: center;
  justify-content: center;
}

.security-visual::before {
  content: '🔐';
  font-size: 4rem;
}

/* ---------- Use Cases Section ---------- */
.use-cases-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.use-case-card {
  background: var(--color-light-card);
  border: 1px solid var(--color-light-border);
  border-radius: var(--radius-xl);
  padding: 32px;
  text-align: center;
  transition: all var(--transition-base);
}

.use-case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.use-case-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.use-case-card h3 {
  font-size: var(--font-size-xl);
  margin-bottom: 12px;
}

.use-case-card p {
  color: var(--color-light-text-muted);
  font-size: var(--font-size-sm);
  line-height: 1.7;
}

/* ---------- Pricing Section ---------- */
.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background: var(--color-light-card);
  border: 2px solid var(--color-light-border);
  border-radius: var(--radius-xl);
  padding: 36px 28px;
  position: relative;
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.pricing-card.popular {
  border-color: var(--color-primary);
  background: #FFFFFF;
  box-shadow: 0 8px 30px rgba(109, 74, 255, 0.15);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  color: #FFFFFF;
  padding: 4px 20px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.pricing-card-header {
  text-align: center;
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-light-border);
}

.pricing-card-header h3 {
  font-size: var(--font-size-xl);
  margin-bottom: 8px;
}

.pricing-price {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  color: var(--color-primary);
}

.pricing-price .currency {
  font-size: var(--font-size-xl);
  vertical-align: top;
}

.pricing-price .period {
  font-size: var(--font-size-sm);
  color: var(--color-light-text-muted);
  font-weight: 400;
}

.pricing-price.free {
  color: var(--color-success);
}

.pricing-features {
  list-style: none;
  flex-grow: 1;
  margin-bottom: 28px;
}

.pricing-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 0;
  font-size: var(--font-size-sm);
  color: var(--color-light-text);
}

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

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

.pricing-note {
  text-align: center;
  margin-top: 32px;
  font-size: var(--font-size-sm);
  color: var(--color-light-text-muted);
}

/* ---------- Reviews & Media Section ---------- */
.media-logos {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 32px;
  margin-bottom: 48px;
  opacity: 0.6;
}

.media-logo {
  font-size: var(--font-size-xl);
  font-weight: 800;
  color: var(--color-light-text-muted);
  letter-spacing: -0.5px;
}

.testimonials-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.testimonial-card {
  background: var(--color-light-card);
  border: 1px solid var(--color-light-border);
  border-radius: var(--radius-xl);
  padding: 28px;
}

.testimonial-stars {
  color: #F5A623;
  font-size: var(--font-size-lg);
  margin-bottom: 12px;
}

.testimonial-text {
  font-size: var(--font-size-base);
  line-height: 1.7;
  color: var(--color-light-text);
  margin-bottom: 16px;
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.testimonial-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  font-weight: 700;
  font-size: var(--font-size-sm);
}

.testimonial-name {
  font-weight: 600;
  font-size: var(--font-size-sm);
}

.testimonial-role {
  font-size: var(--font-size-xs);
  color: var(--color-light-text-muted);
}

/* ---------- FAQ Section ---------- */
.faq-section {
  background: var(--color-light-card);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

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

.faq-item:first-child {
  border-top: 1px solid var(--color-light-border);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-light-text);
  cursor: pointer;
  list-style: none;
  transition: color var(--transition-fast);
  gap: 16px;
}

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

.faq-item summary::marker {
  display: none;
  content: '';
}

.faq-item summary::after {
  content: '+';
  font-size: var(--font-size-xl);
  font-weight: 300;
  color: var(--color-primary);
  flex-shrink: 0;
  transition: transform var(--transition-base);
  width: 24px;
  text-align: center;
}

.faq-item[open] summary::after {
  content: '−';
}

.faq-item summary:hover {
  color: var(--color-primary);
}

.faq-answer {
  padding: 0 0 24px;
  color: var(--color-light-text-muted);
  font-size: var(--font-size-sm);
  line-height: 1.8;
}

.faq-answer ol,
.faq-answer ul {
  padding-left: 20px;
  margin: 12px 0;
}

.faq-answer ol {
  list-style: decimal;
}

.faq-answer ul {
  list-style: disc;
}

.faq-answer li {
  margin-bottom: 8px;
}

.faq-answer p {
  margin-bottom: 12px;
}

.faq-bottom-link {
  text-align: center;
  margin-top: 40px;
}

/* ---------- Final CTA Section ---------- */
.final-cta {
  background: linear-gradient(135deg, #1C1B22 0%, #2D1B69 50%, #1C1B22 100%);
  color: #FFFFFF;
  text-align: center;
  padding: 80px 0;
  position: relative;
  overflow: hidden;
}

.final-cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(circle at 30% 50%, rgba(109, 74, 255, 0.2) 0%, transparent 50%),
    radial-gradient(circle at 70% 50%, rgba(31, 197, 201, 0.15) 0%, transparent 50%);
  pointer-events: none;
}

.final-cta .container {
  position: relative;
  z-index: 1;
}

.final-cta h2 {
  font-size: var(--font-size-3xl);
  margin-bottom: 16px;
}

.final-cta-desc {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 36px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.final-cta-buttons {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
  margin-bottom: 32px;
}

.app-store-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

.app-store-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-md);
  color: #FFFFFF;
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: all var(--transition-base);
}

.app-store-badge:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.4);
  color: #FFFFFF;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-dark-bg);
  color: var(--color-dark-text-muted);
  padding: 64px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--color-dark-border);
}

.footer-column h4 {
  color: var(--color-dark-text);
  font-size: var(--font-size-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 20px;
}

.footer-column ul {
  list-style: none;
}

.footer-column li {
  margin-bottom: 12px;
}

.footer-column a {
  color: var(--color-dark-text-muted);
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
}

.footer-column a:hover {
  color: #FFFFFF;
}

.footer-bottom {
  padding: 24px 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
  text-align: center;
}

.footer-bottom-left {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
}

.footer-copyright {
  font-size: var(--font-size-xs);
  color: var(--color-dark-text-muted);
}

.footer-bottom-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-bottom-links a {
  font-size: var(--font-size-xs);
  color: var(--color-dark-text-muted);
}

.footer-bottom-links a:hover {
  color: #FFFFFF;
}

.footer-social {
  display: flex;
  gap: 16px;
}

.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: var(--color-dark-card);
  color: var(--color-dark-text-muted);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.footer-social a:hover {
  background: var(--color-primary);
  color: #FFFFFF;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */

/* ---------- Tablet: 768px+ ---------- */
@media (min-width: 768px) {
  .container {
    padding: 0 var(--padding-desktop);
  }

  h1 { font-size: var(--font-size-5xl); }
  h2 { font-size: var(--font-size-4xl); }

  /* Navigation */
  .main-nav {
    display: block;
  }

  .lang-switcher {
    display: inline-flex;
  }

  .header-cta {
    display: flex;
    gap: 8px;
  }

  .mobile-menu-toggle {
    display: none;
  }

  /* Hero */
  .hero {
    padding: 140px 0 100px;
  }

  .hero h1 {
    font-size: var(--font-size-5xl);
  }

  .hero-cta-group {
    flex-direction: row;
    justify-content: center;
  }

  /* Trust Badges */
  .trust-badges {
    grid-template-columns: repeat(3, 1fr);
  }

  /* Features Grid */
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Server Map */
  .server-map-visual {
    height: 400px;
  }

  .server-stats {
    flex-direction: row;
    justify-content: center;
    gap: 48px;
  }

  /* Platform Grid */
  .platform-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  /* Security */
  .security-content {
    grid-template-columns: 1fr 1fr;
  }

  /* Use Cases */
  .use-cases-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Pricing */
  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  /* Testimonials */
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Final CTA */
  .final-cta-buttons {
    flex-direction: row;
    justify-content: center;
  }

  /* Footer */
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

/* ---------- Desktop: 1024px+ ---------- */
@media (min-width: 1024px) {
  .section {
    padding: var(--section-spacing-lg) 0;
  }

  .hero {
    padding: 160px 0 120px;
  }

  .hero h1 {
    font-size: var(--font-size-6xl);
  }

  /* Trust Badges */
  .trust-badges {
    grid-template-columns: repeat(5, 1fr);
  }

  .trust-badge {
    flex-direction: row;
    gap: 12px;
  }

  /* Features Grid */
  .features-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  /* Platform Grid */
  .platform-grid {
    grid-template-columns: repeat(6, 1fr);
  }

  /* Use Cases */
  .use-cases-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  /* Testimonials */
  .testimonials-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  /* Footer */
  .footer-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ---------- Large Desktop: 1440px+ ---------- */
@media (min-width: 1440px) {
  :root {
    --max-width: 1280px;
  }

  .hero h1 {
    font-size: 4rem;
  }
}

/* ---------- Small Mobile: 360px ---------- */
@media (max-width: 360px) {
  html {
    font-size: 14px;
  }

  .hero {
    padding: 60px 0;
  }

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

  .pricing-card {
    padding: 24px 16px;
  }
}

/* ---------- Accessibility & Print ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

@media print {
  .site-header,
  .hero::before,
  .hero::after,
  .final-cta,
  .site-footer {
    display: none;
  }

  body {
    color: #000;
    background: #fff;
  }

  a {
    color: #000;
    text-decoration: underline;
  }
}

/* ---------- Skip Link ---------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  background: var(--color-primary);
  color: #FFFFFF;
  padding: 12px 24px;
  z-index: var(--z-modal);
  font-weight: 600;
  border-radius: 0 0 var(--radius-md) 0;
}

.skip-link:focus {
  top: 0;
}