:root {
    --bg-dark: #121212;
    --bg-light: #f8f9fa;
    --text-dark: #e0e0e0;
    --text-light: #333;
    --accent: #646cff;
    --card-bg-dark: #1e1e1e;
    --card-bg-light: #fff;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-dark);
    color: var(--text-dark);
    transition: var(--transition);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

body.light-mode {
    background-color: var(--bg-light);
    color: var(--text-light);
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    cursor: pointer;
    font-size: 1.5rem;
    z-index: 100;
    transition: var(--transition);
}

.theme-toggle:hover {
    transform: rotate(30deg);
}

.live-clock {
    position: fixed;
    top: 20px;
    left: 20px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    opacity: 0.7;
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.hero {
    margin-bottom: 3rem;
}

.gradient-text {
    background: linear-gradient(90deg, #646cff, #61dafb, #646cff);
    background-size: 200% auto;
    color: transparent;
    -webkit-background-clip: text;
    background-clip: text;
    font-size: 4rem;
    font-weight: 800;
    margin: 0;
    animation: gradient 3s linear infinite;
}

@keyframes gradient {
    0% { background-position: 0% center; }
    100% { background-position: 200% center; }
}

.tagline {
    font-size: 1.2rem;
    opacity: 0.8;
    margin-top: 0.5rem;
}

.features {
    display: flex;
    gap: 2rem;
    margin: 2rem 0;
    flex-wrap: wrap;
    justify-content: center;
}

.feature-card {
    background-color: var(--card-bg-dark);
    border-radius: 12px;
    padding: 2rem;
    width: 280px;
    transition: var(--transition);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.light-mode .feature-card {
    background-color: var(--card-bg-light);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(100, 108, 255, 0.2);
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    margin: 0 0 1rem 0;
    color: var(--accent);
}

.feature-card p {
    margin: 0;
    opacity: 0.8;
    line-height: 1.5;
}

.cta-button {
    background-color: var(--accent);
    color: white;
    border: none;
    padding: 1rem 2rem;
    font-size: 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
    margin-top: 2rem;
}

.cta-button:hover {
    transform: scale(1.05);
    box-shadow: 0 0 15px rgba(100, 108, 255, 0.5);
}

@media (max-width: 768px) {
    .gradient-text {
        font-size: 3rem;
    }
    
    .features {
        flex-direction: column;
        align-items: center;
    }
}