/* ========================================
   ELITE VPN LANDING PAGE
   Personal Internet Access
   ======================================== */

/* ========================================
   CSS VARIABLES & DESIGN TOKENS
   ======================================== */
:root {
    /* Colors - Elite Neon Green Theme */
    --neon-green: #39FF14;
    --neon-green-glow: rgba(57, 255, 20, 0.4);
    --dark-bg: #0a0e27;
    --dark-bg-secondary: #0f1b2c;
    --dark-bg-tertiary: #1a2332;
    
    /* Glassmorphism */
    --glass-bg: rgba(26, 35, 50, 0.5);
    --glass-border: rgba(255, 255, 255, 0.1);
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #b8c5d6;
    --text-tertiary: #8895a7;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 30px var(--neon-green-glow);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ========================================
   RESET & BASE STYLES
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--dark-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ========================================
   ANIMATED BACKGROUND
   ======================================== */
.background-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.gradient-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(
        ellipse at top,
        rgba(57, 255, 20, 0.15) 0%,
        rgba(15, 27, 44, 0.8) 50%,
        var(--dark-bg) 100%
    );
    animation: gradientShift 20s ease infinite;
}

@keyframes gradientShift {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

.continents-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('../images/continents.svg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0.03;
    filter: blur(1px);
    animation: float 30s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-20px) scale(1.02); }
}

.scanlines {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(57, 255, 20, 0.02) 2px,
        rgba(57, 255, 20, 0.02) 4px
    );
    pointer-events: none;
    animation: scan 10s linear infinite;
}

@keyframes scan {
    0% { transform: translateY(0); }
    100% { transform: translateY(20px); }
}

/* ========================================
   UTILITY CLASSES
   ======================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.glass-effect {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-lg);
}

.gradient-text {
    background: linear-gradient(135deg, var(--neon-green) 0%, #00ff88 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ========================================
   NAVIGATION
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition-base);
}

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

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-logo {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
}

.nav-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
}

.btn-primary {
    padding: 10px 24px;
    background: var(--neon-green);
    color: #000;
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 14px;
    transition: var(--transition-base);
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 40px var(--neon-green-glow);
}

/* ========================================
   HERO SECTION
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 0 80px;
}

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

.hero-icon-wrapper {
    position: relative;
    display: inline-block;
    margin-bottom: 40px;
}

.glow-circle {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, var(--neon-green-glow) 0%, transparent 70%);
    border-radius: 50%;
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.5; }
    50% { transform: translate(-50%, -50%) scale(1.2); opacity: 0.8; }
}

.hero-icon {
    width: 120px;
    height: 120px;
    border-radius: var(--radius-xl);
    position: relative;
    z-index: 1;
    filter: drop-shadow(0 0 20px var(--neon-green-glow));
}

.hero-title {
    font-size: clamp(48px, 8vw, 80px);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: clamp(18px, 3vw, 24px);
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    margin-bottom: 60px;
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 18px 40px;
    background: var(--neon-green);
    color: #000;
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 18px;
    transition: var(--transition-base);
    box-shadow: 0 0 30px var(--neon-green-glow);
}

.btn-download:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 40px var(--neon-green-glow);
}

.btn-download.large {
    padding: 20px 48px;
    font-size: 20px;
}

.apple-icon {
    width: 24px;
    height: 24px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    max-width: 800px;
    margin: 0 auto;
}

.stat-card {
    padding: 32px;
    border-radius: var(--radius-lg);
    transition: var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-8px);
    border-color: var(--neon-green);
}

.stat-number {
    font-size: 48px;
    font-weight: 900;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 16px;
    color: var(--text-secondary);
    font-weight: 600;
}

/* ========================================
   FEATURES SECTION
   ======================================== */
.features {
    padding: 100px 0;
}

.section-title {
    font-size: clamp(36px, 5vw, 56px);
    font-weight: 900;
    text-align: center;
    margin-bottom: 64px;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.feature-card {
    padding: 40px;
    border-radius: var(--radius-xl);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--neon-green), transparent);
    opacity: 0;
    transition: var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: var(--neon-green);
}

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

.feature-icon-wrapper {
    width: 64px;
    height: 64px;
    background: rgba(57, 255, 20, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}

.feature-icon {
    width: 32px;
    height: 32px;
    color: var(--neon-green);
}

.feature-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-description {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ========================================
   DOWNLOAD SECTION
   ======================================== */
.download {
    padding: 100px 0;
}

.download-card {
    padding: 80px 60px;
    border-radius: var(--radius-xl);
    text-align: center;
}

.download-title {
    font-size: clamp(36px, 5vw, 48px);
    font-weight: 900;
    margin-bottom: 16px;
}

.download-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.download-note {
    margin-top: 24px;
    font-size: 14px;
    color: var(--text-tertiary);
}

/* ========================================
   FOOTER
   ======================================== */
.footer {
    padding: 80px 0 40px;
    border-top: 1px solid var(--glass-border);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.footer-logo {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
}

.footer-tagline {
    color: var(--text-secondary);
    font-size: 16px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 40px;
}

.footer-column {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-heading {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--neon-green);
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition-fast);
}

.footer-link:hover {
    color: var(--neon-green);
    padding-left: 4px;
}

.footer-bottom {
    text-align: center;
    padding-top: 40px;
    border-top: 1px solid var(--glass-border);
}

.footer-copyright {
    color: var(--text-tertiary);
    font-size: 14px;
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */
@media (max-width: 1024px) {
    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-title {
        font-size: 16px;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        max-width: 300px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .download-card {
        padding: 60px 32px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .btn-download.large {
        padding: 16px 32px;
        font-size: 18px;
        width: 100%;
    }
    
    .stat-card {
        padding: 24px;
    }
    
    .feature-card {
        padding: 32px 24px;
    }
}

/* ========================================
   PERFORMANCE OPTIMIZATIONS
   ======================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}