/* 
   CryptoEdu - Modern Crypto Awareness Platform
   Theme: Dark with Neon Accents
*/

:root {
    /* Colors */
    --bg-dark: #0a0b1e;
    --bg-card: #161838;
    --bg-header: rgba(10, 11, 30, 0.95);
    
    --primary: #00f0ff; /* Neon Cyan */
    --secondary: #7000ff; /* Neon Purple */
    --accent: #00ff9d; /* Neon Green */
    --danger: #ff0055; /* Neon Red for warnings */
    
    --text-main: #ffffff;
    --text-muted: #b4b4c8;
    
    --gradient-main: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
    --gradient-glow: linear-gradient(135deg, rgba(112, 0, 255, 0.5) 0%, rgba(0, 240, 255, 0.5) 100%);
    
    /* Spacing */
    --container-width: 1200px;
    --header-height: 80px;
    
    /* Transitions */
    --transition-speed: 0.3s;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

/* Layout Utilities */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 80px 0;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    margin-bottom: 20px;
    font-weight: 700;
}

h1 { font-size: 3.5rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.8rem; }

.text-gradient {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }

/* Header & Nav */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: var(--bg-header);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    font-weight: 500;
    position: relative;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--primary);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width var(--transition-speed);
}

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

.mobile-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 50px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--gradient-main);
    color: white;
    box-shadow: 0 4px 15px rgba(0, 240, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 240, 255, 0.5);
}

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

.btn-outline:hover {
    background: rgba(0, 240, 255, 0.1);
    transform: translateY(-3px);
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: var(--header-height);
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(112, 0, 255, 0.2) 0%, rgba(0, 0, 0, 0) 70%);
    z-index: -1;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -20%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 240, 255, 0.15) 0%, rgba(0, 0, 0, 0) 70%);
    z-index: -1;
}

.hero-content {
    max-width: 600px;
}

.hero-subtitle {
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 600;
    margin-bottom: 10px;
    display: block;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    margin-top: 30px;
}

.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    position: relative;
}

.coin-float {
    animation: float 6s ease-in-out infinite;
    font-size: 15rem;
    color: rgba(255, 255, 255, 0.05);
    text-shadow: 0 0 50px rgba(0, 240, 255, 0.2);
}

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

/* Cards */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.card {
    background: var(--bg-card);
    padding: 30px;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform var(--transition-speed), border-color var(--transition-speed);
}

.card:hover {
    transform: translateY(-10px);
    border-color: var(--primary);
}

.card-icon {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 20px;
}

/* Footer */
footer {
    background: var(--bg-card);
    padding: 60px 0 20px;
    margin-top: 60px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    color: white;
    margin-bottom: 20px;
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul li a {
    color: var(--text-muted);
}

.footer-col ul li a:hover {
    color: var(--primary);
}

.disclaimer-bar {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background: var(--bg-header);
        flex-direction: column;
        padding: 20px;
        text-align: center;
    }

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

    .mobile-toggle {
        display: block;
    }

    h1 { font-size: 2.5rem; }
    
    .hero {
        flex-direction: column-reverse;
        justify-content: center;
        text-align: center;
        padding-top: 120px;
        height: auto;
        min-height: 100vh;
    }
    
    .hero-buttons {
        justify-content: center;
    }

    .hero-visual {
        margin-bottom: 40px;
    }
}