/* Global Styles */
:root {
    --primary-color: #64ffda;
    /* Bright Cyan/Teal for accents */
    --secondary-color: #112240;
    /* Lighter Deep Blue for cards/sections */
    --bg-color: #0a192f;
    /* Deep Navy Blue Background */
    --text-color: #e6f1ff;
    /* Off-white for text */
    --heading-color: #ccd6f6;
    /* Slighter lighter white for headings */
    --nav-bg: rgba(10, 25, 47, 0.95);
    --font-stack: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Roboto", "Helvetica Neue", Arial, sans-serif;
}

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

body {
    font-family: var(--font-stack);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

ul {
    list-style: none;
}

/* Utilities */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 4px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 1px solid var(--primary-color);
}

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

.btn-primary:hover {
    background-color: rgba(100, 255, 218, 0.1);
}

.btn-filled {
    background-color: var(--primary-color);
    color: var(--bg-color);
}

.btn-filled:hover {
    opacity: 0.9;
}

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

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: 1px;
}

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

.nav-links a {
    font-size: 0.95rem;
    color: var(--heading-color);
}

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

/* Hero Section */
.hero {
    padding: 180px 0 100px;
    min-height: 80vh;
    display: flex;
    align-items: center;
    background: radial-gradient(circle at 50% 50%, #112240 0%, #0a192f 100%);
    position: relative;
    overflow: hidden;
}

/* Abstract background shape */
.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(100, 255, 218, 0.05) 0%, transparent 70%);
    border-radius: 50%;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero h1 {
    font-size: 3.5rem;
    color: var(--heading-color);
    margin-bottom: 20px;
    line-height: 1.1;
}

.hero h1 span {
    color: var(--primary-color);
}

.hero-desc {
    font-size: 1.2rem;
    color: #8892b0;
    margin-bottom: 40px;
    max-width: 600px;
}

.hero-cta {
    display: flex;
    gap: 20px;
}

/* Features Section */
.features {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    color: var(--heading-color);
    margin-bottom: 15px;
}

.section-header p {
    color: #8892b0;
    font-size: 1.1rem;
}

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

.feature-card {
    background-color: var(--secondary-color);
    padding: 40px 30px;
    border-radius: 6px;
    transition: transform 0.3s ease;
    border: 1px solid transparent;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

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

.feature-card h3 {
    font-size: 1.5rem;
    color: var(--heading-color);
    margin-bottom: 15px;
}

.feature-card p {
    color: #8892b0;
    font-size: 1rem;
}

/* Stats Section */
.stats {
    padding: 80px 0;
    background-color: var(--secondary-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    text-align: center;
    gap: 20px;
}

.stat-item h3 {
    font-size: 2.5rem;
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: 10px;
}

.stat-item p {
    color: var(--heading-color);
    font-size: 1rem;
}

/* Footer */
footer {
    padding: 50px 0;
    text-align: center;
    background-color: #020c1b;
    color: #8892b0;
    font-size: 0.9rem;
}

footer a {
    color: #8892b0;
}

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

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

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