:root {
    --md-sys-color-primary: #6750A4;
    --md-sys-color-on-primary: #FFFFFF;
    --md-sys-color-primary-container: #EADDFF;
    --md-sys-color-on-primary-container: #21005D;
    --md-sys-color-secondary: #625B71;
    --md-sys-color-on-secondary: #FFFFFF;
    --md-sys-color-secondary-container: #E8DEF8;
    --md-sys-color-on-secondary-container: #1D192B;
    --md-sys-color-background: #FFFBFE;
    --md-sys-color-on-background: #1C1B1F;
    --md-sys-color-surface: #FFFBFE;
    --md-sys-color-on-surface: #1C1B1F;
    --md-sys-color-surface-variant: #E7E0EC;
    --md-sys-color-on-surface-variant: #49454F;
    --md-sys-color-outline: #79747E;

    /* Expressive Customizations */
    --md-ref-typeface-brand: 'Roboto', sans-serif;
    --md-ref-typeface-plain: 'Roboto', sans-serif;
    --border-radius-large: 24px;
    --border-radius-medium: 12px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --md-sys-color-primary: #D0BCFF;
        --md-sys-color-on-primary: #381E72;
        --md-sys-color-primary-container: #4F378B;
        --md-sys-color-on-primary-container: #EADDFF;
        --md-sys-color-secondary: #CCC2DC;
        --md-sys-color-on-secondary: #332D41;
        --md-sys-color-secondary-container: #4A4458;
        --md-sys-color-on-secondary-container: #E8DEF8;
        --md-sys-color-background: #1C1B1F;
        --md-sys-color-on-background: #E6E1E5;
        --md-sys-color-surface: #1C1B1F;
        --md-sys-color-on-surface: #E6E1E5;
        --md-sys-color-surface-variant: #49454F;
        --md-sys-color-on-surface-variant: #CAC4D0;
        --md-sys-color-outline: #938F99;
    }
}

body {
    background-color: var(--md-sys-color-background);
    color: var(--md-sys-color-on-background);
    font-family: var(--md-ref-typeface-plain);
    margin: 0;
    padding: 0;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3 {
    margin: 0;
    font-weight: 500;
}

h1 {
    font-size: 3.5rem; /* Display Small/Medium for impact */
    line-height: 1.1;
    margin-bottom: 1rem;
}

h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--md-sys-color-primary);
}

p {
    font-size: 1.1rem;
    color: var(--md-sys-color-on-surface-variant);
    max-width: 60ch;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Hero Section */
.hero {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: radial-gradient(circle at top right, var(--md-sys-color-primary-container), transparent 40%);
    padding: 4rem 1rem;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.app-icon {
    width: 120px;
    height: 120px;
    background-color: var(--md-sys-color-primary);
    border-radius: 32px; /* Super-ellipse ish */
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--md-sys-color-on-primary);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.download-btn {
    display: inline-flex;
    align-items: center;
    background-color: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
    padding: 1rem 2rem;
    border-radius: 100px;
    text-decoration: none;
    font-weight: 500;
    font-size: 1.2rem;
    transition: transform 0.2s, box-shadow 0.2s;
    margin-top: 2rem;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.2);
}

/* Features Grid */
.features {
    padding: 6rem 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-top: 3rem;
}

.feature-card {
    background-color: var(--md-sys-color-surface-variant);
    padding: 2rem;
    border-radius: var(--border-radius-large);
    transition: background-color 0.2s;
}

.feature-card h3 {
    margin-bottom: 0.5rem;
    color: var(--md-sys-color-on-surface);
}

.feature-card p {
    font-size: 1rem;
    margin: 0;
}

/* Footer */
footer {
    text-align: center;
    padding: 4rem 0;
    color: var(--md-sys-color-on-surface-variant);
    border-top: 1px solid var(--md-sys-color-outline);
    background-color: var(--md-sys-color-surface);
}

footer a {
    color: var(--md-sys-color-primary);
    text-decoration: none;
    margin: 0 1rem;
}