:root {
    --bg-color: #0f0c1d;
    --text-color: #ffffff;
    --accent-primary: #9d00ff;
    --accent-secondary: #00ffcc;
    --card-bg: #1a162b;
    --font-main: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

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

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

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 40px;
    background: rgba(15, 12, 29, 0.9);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    background: linear-gradient(45deg, var(--accent-secondary), var(--accent-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

nav a {
    color: var(--text-color);
    text-decoration: none;
    margin-left: 20px;
    font-size: 0.9rem;
    opacity: 0.8;
    transition: opacity 0.3s;
}

nav a:hover {
    opacity: 1;
}

/* Hero Section */
.hero {
    height: 80vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 20px;
    position: relative;
    overflow: hidden;
}

/* Abstract Background */
.hero::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(157,0,255,0.2) 0%, rgba(0,0,0,0) 70%);
    transform: translate(-50%, -50%);
    z-index: -1;
    filter: blur(60px);
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    line-height: 1.2;
}

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

.btn-download {
    display: inline-block;
    padding: 15px 30px;
    background: linear-gradient(90deg, var(--accent-primary), #6a00ff);
    color: white;
    text-decoration: none;
    border-radius: 30px;
    font-weight: bold;
    font-size: 1.1rem;
    box-shadow: 0 0 20px rgba(157, 0, 255, 0.5);
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(157, 0, 255, 0.7);
}

/* Features Section */
.features {
    padding: 80px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.feature-card {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 20px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform 0.3s;
}

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

.icon {
    font-size: 3rem;
    margin-bottom: 20px;
    color: var(--accent-secondary);
}

.feature-card h3 {
    margin-bottom: 15px;
    font-size: 1.5rem;
}

.feature-card p {
    color: #aaa;
}

/* Energy Circle Visual */
.energy-circle-container {
    padding: 60px 0;
    text-align: center;
}

.energy-visual {
    width: 200px;
    height: 200px;
    margin: 0 auto 30px;
    border-radius: 50%;
    border: 2px solid var(--accent-secondary);
    box-shadow: 0 0 20px var(--accent-secondary), inset 0 0 20px var(--accent-secondary);
    position: relative;
    animation: pulse 3s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 0.8; }
    50% { transform: scale(1.1); opacity: 1; box-shadow: 0 0 40px var(--accent-secondary), inset 0 0 40px var(--accent-secondary); }
    100% { transform: scale(1); opacity: 0.8; }
}

/* Footer */
footer {
    text-align: center;
    padding: 40px;
    color: #666;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    margin-top: 60px;
}

footer a {
    color: #888;
    text-decoration: none;
    margin: 0 10px;
    font-size: 0.9rem;
}

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