:root {
    --primary-color: #4F46E5;
    --secondary-color: #818CF8;
    --text-color: #1F2937;
    --background-color: #F9FAFB;
    --white: #FFFFFF;
}

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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.5;
    color: var(--text-color);
    background-color: var(--background-color);
}

/* Header & Navigation */
header {
    background-color: var(--white);
    padding: 1rem 2rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-links a {
    margin-left: 2rem;
    text-decoration: none;
    color: var(--text-color);
}

/* Main Content */
main {
    margin-top: 4rem;
    padding: 2rem;
}

.hero {
    text-align: center;
    padding: 4rem 1rem;
    max-width: 800px;
    margin: 0 auto;
}

h1 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.subtitle {
    font-size: 1.25rem;
    color: #4B5563;
    margin-bottom: 2rem;
}

/* Buttons */
.cta-button, .primary-button, .secondary-button {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 0.375rem;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s;
}

.cta-button, .primary-button {
    background-color: var(--primary-color);
    color: var(--white);
}

.secondary-button {
    background-color: var(--white);
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    margin-left: 1rem;
}

/* Features Section */
.features {
    padding: 4rem 1rem;
    background-color: var(--white);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 2rem auto;
}

.feature-card {
    padding: 2rem;
    background-color: var(--background-color);
    border-radius: 0.5rem;
    text-align: center;
}

/* Demo Section */
.demo {
    padding: 4rem 1rem;
}

.video-container {
    max-width: 800px;
    margin: 2rem auto;
    aspect-ratio: 16/9;
    background-color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 0.5rem;
}

.video-placeholder {
    color: #9CA3AF;
    font-size: 1.25rem;
}

/* Download Section */
.download {
    padding: 4rem 1rem;
    text-align: center;
    background-color: var(--white);
}

.download-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

.download-button {
    padding: 1rem 2rem;
    border-radius: 0.375rem;
    text-decoration: none;
    font-weight: 500;
    color: var(--white);
    background-color: var(--primary-color);
}

/* Footer */
footer {
    background-color: var(--text-color);
    color: var(--white);
    padding: 4rem 2rem 2rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
}

.footer-section a {
    color: #9CA3AF;
    text-decoration: none;
    display: block;
    margin-bottom: 0.5rem;
}

.footer-bottom {
    text-align: center;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid #374151;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .cta-group {
        display: flex;
        flex-direction: column;
        gap: 1rem;
    }
    
    .secondary-button {
        margin-left: 0;
    }
}