:root {
    --primary-color: #2196F3;
    --secondary-color: #1976D2;
    --background-color: #121212;
    --surface-color: #1E1E1E;
    --text-color: #FFFFFF;
    --text-secondary: #B0B0B0;
    --spacing-unit: 1rem;
}

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

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

/* Navigation */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-unit);
    background-color: var(--surface-color);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.logo img {
    height: 40px;
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    margin-left: var(--spacing-unit);
    transition: color 0.3s ease;
}

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

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: calc(var(--spacing-unit) * 4) var(--spacing-unit);
    background: linear-gradient(to bottom, var(--surface-color), var(--background-color));
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-unit);
}

.tagline {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-unit);
}

.value-prop {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-unit) * 2;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2rem;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

.cta-button:hover {
    background-color: var(--secondary-color);
}

.hero-image img {
    max-width: 100%;
    height: auto;
    margin-top: var(--spacing-unit) * 2;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

/* Features Section */
.features {
    padding: calc(var(--spacing-unit) * 4) var(--spacing-unit);
    background-color: var(--surface-color);
}

.features h2 {
    text-align: center;
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-unit) * 2;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background-color: var(--background-color);
    padding: var(--spacing-unit) * 2;
    border-radius: 8px;
    text-align: center;
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-card .material-icons {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: var(--spacing-unit);
}

/* Showcase Section */
.showcase {
    padding: calc(var(--spacing-unit) * 4) var(--spacing-unit);
}

.showcase h2 {
    text-align: center;
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.screenshot-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-unit) * 2;
    max-width: 1200px;
    margin: 0 auto;
}

.screenshot {
    text-align: center;
}

.screenshot img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    margin-bottom: var(--spacing-unit);
}

/* Download Section */
.download {
    padding: calc(var(--spacing-unit) * 4) var(--spacing-unit);
    background-color: var(--surface-color);
    text-align: center;
}

.download-content {
    max-width: 800px;
    margin: 0 auto;
}

.app-benefits {
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.app-benefits ul {
    list-style: none;
    text-align: left;
    max-width: 400px;
    margin: var(--spacing-unit) auto;
}

.app-benefits li {
    margin-bottom: var(--spacing-unit);
}

.play-store-button img {
    height: 60px;
    transition: transform 0.3s ease;
}

.play-store-button:hover img {
    transform: scale(1.05);
}

/* Footer */
footer {
    background-color: var(--background-color);
    padding: calc(var(--spacing-unit) * 3) var(--spacing-unit);
}

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

.footer-section h4 {
    margin-bottom: var(--spacing-unit);
    color: var(--primary-color);
}

.footer-section a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: var(--text-color);
}

.social-links {
    display: flex;
    gap: var(--spacing-unit);
}

.social-links .material-icons {
    font-size: 24px;
}

.copyright {
    text-align: center;
    margin-top: calc(var(--spacing-unit) * 2);
    color: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .tagline {
        font-size: 1.2rem;
    }

    .nav-links {
        display: none;
    }

    .feature-grid,
    .screenshot-grid {
        grid-template-columns: 1fr;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --background-color: #121212;
        --surface-color: #1E1E1E;
        --text-color: #FFFFFF;
        --text-secondary: #B0B0B0;
    }
}

/* Mobile Menu Styles */
.mobile-menu-button {
    display: none;
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 60px;
    left: 0;
    width: 100%;
    background-color: var(--surface-color);
    padding: var(--spacing-unit);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

.mobile-menu a {
    display: block;
    padding: var(--spacing-unit);
    color: var(--text-color);
    text-decoration: none;
    text-align: center;
    border-bottom: 1px solid var(--background-color);
}

.mobile-menu a:last-child {
    border-bottom: none;
}

@media (max-width: 768px) {
    .mobile-menu-button {
        display: block;
    }

    .mobile-menu.active {
        display: block;
    }
}