:root {
    --primary-color: #2D6A6A; /* AppTheme.primary based on context intuition or standard teal */
    --text-color: #333;
    --bg-color: #FDFDFD;
    --secondary-bg: #F5F7FA;
    --accent-color: #FFB74D; /* Orange/Amber for accents like lightbulb */
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    margin: 0;
    padding: 0;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
}

header {
    background-color: var(--primary-color);
    color: white;
    padding: 2rem 1rem;
    text-align: center;
}

header img.app-icon {
    width: 120px;
    height: 120px;
    border-radius: 24px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    margin-bottom: 1rem;
}

h1 {
    margin: 0.5rem 0;
    font-size: 2.5rem;
    font-weight: 700;
}

h2 {
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
    margin-top: 3rem;
    margin-bottom: 1.5rem;
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 1rem;
}

.btn-download {
    display: inline-block;
    background-color: white;
    color: var(--primary-color);
    padding: 12px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: bold;
    font-size: 1.1rem;
    margin-top: 1rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.15);
}

.section {
    padding: 2rem 0;
}

.feature {
    display: flex;
    align-items: center;
    margin-bottom: 4rem;
    flex-wrap: wrap;
}

.feature:nth-child(even) {
    flex-direction: row-reverse;
}

.feature-text {
    flex: 1;
    padding: 0 2rem;
    min-width: 300px;
}

.feature-image {
    flex: 1;
    text-align: center;
    min-width: 300px;
}

.feature-image img {
    max-width: 80%;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    border: 1px solid rgba(0,0,0,0.05);
}

.keywords {
    background-color: var(--secondary-bg);
    padding: 2rem;
    border-radius: 12px;
    font-size: 0.9rem;
    color: #666;
}

footer {
    text-align: center;
    padding: 2rem;
    margin-top: 4rem;
    border-top: 1px solid #eee;
    color: #888;
}

@media (max-width: 768px) {
    .feature {
        flex-direction: column !important;
        text-align: center;
    }
    .feature-text {
        padding: 0 0 2rem 0;
    }
    .feature-image img {
        max-width: 100%; 
        width: 280px; 
    }
}