/* ========================================
   USDT Hub - Global Styles
   Dark Theme with Neon & Glassmorphism
   ======================================== */

/* CSS Variables */
:root {
    /* Colors */
    --bg-primary: #0a0a0f;
    --bg-secondary: #121218;
    --bg-tertiary: #1a1a24;
    
    /* Neon Colors */
    --neon-cyan: #00f0ff;
    --neon-purple: #b24bf3;
    --neon-pink: #ff3366;
    --neon-blue: #4d7fff;
    --neon-green: #00ff88;
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #b8b9c0;
    --text-muted: #6b6c7e;
    
    /* Glassmorphism */
    --glass-bg: rgba(26, 26, 36, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    
    /* Shadows */
    --shadow-cyan: 0 0 30px rgba(0, 240, 255, 0.3);
    --shadow-purple: 0 0 30px rgba(178, 75, 243, 0.3);
    --shadow-pink: 0 0 30px rgba(255, 51, 102, 0.3);
    
    /* Fonts */
    --font-primary: 'Inter', sans-serif;
    --font-heading: 'Orbitron', monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 30px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

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

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
}

.gradient-text {
    background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple), var(--neon-pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.neon-text {
    color: var(--neon-cyan);
    text-shadow: 0 0 20px var(--neon-cyan),
                 0 0 40px var(--neon-cyan),
                 0 0 60px var(--neon-cyan);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    padding: 1rem 0;
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
}

.logo-icon {
    font-size: 2rem;
    filter: drop-shadow(0 0 10px var(--neon-cyan));
}

.logo-text {
    background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--neon-cyan);
    transition: width 0.3s ease;
}

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

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

.nav-actions {
    display: flex;
    gap: 1rem;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: transparent;
    border: none;
    cursor: pointer;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: var(--neon-cyan);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
    color: white;
    box-shadow: var(--shadow-cyan);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 40px rgba(0, 240, 255, 0.5);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--neon-cyan);
    color: var(--neon-cyan);
}

.btn-outline:hover {
    background: var(--neon-cyan);
    color: var(--bg-primary);
    box-shadow: var(--shadow-cyan);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-block {
    width: 100%;
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 8rem 0 4rem;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(0, 240, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(178, 75, 243, 0.1) 0%, transparent 50%);
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-title {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.highlight {
    color: var(--neon-cyan);
    font-weight: 700;
}

.hero-stats {
    display: flex;
    gap: 3rem;
    margin-bottom: 2rem;
}

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

.stat-value {
    font-size: 2.5rem;
    font-weight: 800;
    font-family: var(--font-heading);
    background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.hero-cta {
    display: flex;
    gap: 1rem;
}

/* Floating Cards Animation */
.hero-visual {
    position: relative;
    height: 500px;
}

.floating-card {
    position: absolute;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    animation: float 3s ease-in-out infinite;
}

.floating-card.card-1 {
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.floating-card.card-2 {
    top: 50%;
    right: 10%;
    animation-delay: 1s;
}

.floating-card.card-3 {
    bottom: 10%;
    left: 20%;
    animation-delay: 2s;
}

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

.card-icon {
    font-size: 3rem;
    filter: drop-shadow(0 0 10px var(--neon-cyan));
}

.card-title {
    font-family: var(--font-heading);
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.card-value {
    color: var(--neon-cyan);
    font-weight: 700;
}

/* Section Styles */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

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

/* Features Section */
.features {
    padding: 6rem 0;
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    border-color: var(--neon-cyan);
    box-shadow: var(--shadow-cyan);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    filter: drop-shadow(0 0 10px var(--neon-cyan));
}

.feature-title {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

.feature-text {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Assets Preview Section */
.assets-preview {
    padding: 6rem 0;
}

.assets-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.asset-card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 2px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
}

.asset-card:hover {
    transform: translateY(-10px);
    border-color: var(--neon-cyan);
    box-shadow: var(--shadow-cyan);
}

.asset-card.featured {
    border-color: var(--neon-purple);
    box-shadow: var(--shadow-purple);
}

.featured-badge {
    position: absolute;
    top: -12px;
    right: 20px;
    background: linear-gradient(135deg, var(--neon-purple), var(--neon-pink));
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
}

.asset-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    filter: drop-shadow(0 0 15px var(--neon-cyan));
}

.asset-name {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

.asset-badge {
    display: inline-block;
    background: rgba(0, 240, 255, 0.1);
    color: var(--neon-cyan);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-bottom: 1rem;
}

.asset-price {
    font-size: 2rem;
    font-weight: 800;
    font-family: var(--font-heading);
    color: var(--neon-cyan);
    margin-bottom: 1rem;
}

.asset-income {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    margin-bottom: 0.5rem;
}

.income-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.income-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--neon-green);
}

.asset-percent {
    font-size: 1rem;
    color: var(--neon-purple);
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.section-cta {
    text-align: center;
}

/* Stats Section */
.stats-section {
    padding: 6rem 0;
    background: var(--bg-secondary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.stat-box {
    text-align: center;
    padding: 2rem;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    transition: all 0.3s ease;
}

.stat-box:hover {
    transform: translateY(-5px);
    border-color: var(--neon-cyan);
    box-shadow: var(--shadow-cyan);
}

.stat-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    font-family: var(--font-heading);
    color: var(--neon-cyan);
    margin-bottom: 0.5rem;
}

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

/* CTA Section */
.cta-section {
    padding: 6rem 0;
    background: linear-gradient(135deg, rgba(0, 240, 255, 0.05), rgba(178, 75, 243, 0.05));
}

.cta-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.cta-title {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.cta-text {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    padding: 4rem 0 2rem;
    border-top: 1px solid var(--glass-border);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-brand {
    max-width: 300px;
}

.footer-text {
    color: var(--text-secondary);
    margin-top: 1rem;
}

.footer-title {
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.footer-column ul li {
    margin-bottom: 0.75rem;
}

.footer-column ul li a {
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.footer-column ul li a:hover {
    color: var(--neon-cyan);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--glass-border);
    color: var(--text-secondary);
}

.demo-notice {
    margin-top: 0.5rem;
    color: var(--neon-pink);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
    }
    
    .hero-visual {
        display: none;
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 1rem;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .cta-title {
        font-size: 2rem;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}