:root {
    --primary-color: #4CAF50;
    --primary-dark: #388E3C;
    --secondary-color: #2196F3;
    --text-color: #333;
    --text-light: #666;
    --bg-color: #ffffff;
    --bg-secondary: #f8f9fa;
    --border-color: #e0e0e0;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
}

@media (prefers-color-scheme: dark) {
    :root {
        --text-color: #e0e0e0;
        --text-light: #b0b0b0;
        --bg-color: #1a1a1a;
        --bg-secondary: #2a2a2a;
        --border-color: #404040;
        --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.4);
    }
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: linear-gradient(135deg, var(--bg-color) 0%, var(--bg-secondary) 100%);
    min-height: 100vh;
}

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

/* Header */
.header {
    text-align: center;
    padding: 60px 0 40px;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 16px;
}

.logo-img {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    box-shadow: var(--shadow);
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-color);
}

.tagline {
    font-size: 1.2rem;
    color: var(--text-light);
    margin-top: 8px;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 60px 0;
}

.hero h2 {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 24px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.3;
}

.hero-description {
    font-size: 1.2rem;
    color: var(--text-light);
    margin-bottom: 40px;
    line-height: 1.8;
}

.download-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 16px 32px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Features Section */
.features {
    padding: 80px 0;
}

.features h3 {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 60px;
    color: var(--text-color);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    margin-top: 40px;
}

.feature-card {
    background: var(--bg-color);
    padding: 32px;
    border-radius: 16px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.feature-card h4 {
    font-size: 1.4rem;
    margin-bottom: 12px;
    color: var(--text-color);
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.6;
}

/* Screenshots Section */
.screenshots {
    padding: 80px 0;
    background: var(--bg-secondary);
    border-radius: 24px;
    margin: 40px 0;
}

.screenshots h3 {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 60px;
    color: var(--text-color);
}

.screenshot-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
    padding: 0 40px;
}

.screenshot-placeholder {
    aspect-ratio: 9/16;
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.1) 0%, rgba(33, 150, 243, 0.1) 100%);
    border: 2px dashed var(--border-color);
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--text-light);
    font-weight: 500;
}

/* CTA Section */
.cta {
    text-align: center;
    padding: 80px 0;
}

.cta h3 {
    font-size: 2.2rem;
    margin-bottom: 16px;
    color: var(--text-color);
}

.cta p {
    font-size: 1.2rem;
    color: var(--text-light);
    margin-bottom: 40px;
}

/* Footer */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 40px 0;
    margin-top: 80px;
}

.footer-content {
    text-align: center;
}

.footer-links {
    display: flex;
    gap: 32px;
    justify-content: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

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

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

.copyright {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .header h1 {
        font-size: 2rem;
    }

    .hero h2 {
        font-size: 2rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .features h3,
    .screenshots h3,
    .cta h3 {
        font-size: 1.8rem;
    }

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

    .screenshot-grid {
        grid-template-columns: 1fr;
        padding: 0 20px;
    }

    .footer-links {
        flex-direction: column;
        gap: 16px;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.5rem;
    }

    .hero h2 {
        font-size: 1.6rem;
    }

    .btn {
        padding: 14px 24px;
        font-size: 1rem;
    }
}