:root {
    /* Brand Palette - Material 3 */
    --md-sys-color-primary: #4F6A61;
    --md-sys-color-on-primary: #FFFFFF;
    --md-sys-color-primary-container: #DDE7E1;
    --md-sys-color-on-primary-container: #243B34;
    
    --md-sys-color-secondary: #2E7D5C;
    --md-sys-color-on-secondary: #FFFFFF;
    --md-sys-color-secondary-container: #CBE9D9;
    
    --md-sys-color-surface: #F4F7F2; /* App Background */
    --md-sys-color-surface-container: #FFFFFF; /* Cards */
    --md-sys-color-on-surface: #18211D;
    --md-sys-color-on-surface-variant: #48534E;
    
    --md-sys-color-outline: #C7D1C9;
    --md-sys-color-error: #B56B6B;

    /* Spacing & Layout */
    --radius-l: 24px;
    --radius-m: 16px;
    --radius-s: 8px;
    
    --spacing-xs: 4px;
    --spacing-s: 8px;
    --spacing-m: 16px;
    --spacing-l: 24px;
    --spacing-xl: 48px;
}

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

body {
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    background-color: var(--md-sys-color-surface);
    color: var(--md-sys-color-on-surface);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4 {
    color: var(--md-sys-color-on-surface);
    font-weight: 500; /* Medium, typical for M3 headers */
}

h1 { font-size: 3rem; line-height: 1.1; letter-spacing: -0.02em; }
h2 { font-size: 2rem; margin-bottom: var(--spacing-m); }
h3 { font-size: 1.25rem; margin-bottom: var(--spacing-s); font-weight: 600; }
p { margin-bottom: var(--spacing-m); color: var(--md-sys-color-on-surface-variant); font-size: 1.05rem; }

a { color: var(--md-sys-color-primary); text-decoration: none; font-weight: 500; }
a:hover { text-decoration: underline; }

/* Layout Containers */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 var(--spacing-l);
}

header {
    padding: var(--spacing-l) 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--md-sys-color-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-s);
}

nav a {
    margin-left: var(--spacing-l);
    color: var(--md-sys-color-on-surface-variant);
    font-size: 0.9rem;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 80px 0 60px;
}

.hero h1 {
    margin-bottom: var(--spacing-m);
    color: var(--md-sys-color-primary);
}

.hero .tagline {
    font-size: 1.25rem;
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
}

.cta-button {
    display: inline-block;
    background-color: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
    padding: 12px 32px;
    border-radius: 100px; /* Fully rounded M3 buttons */
    font-weight: 600;
    font-size: 1rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

.cta-button:hover {
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

/* Feature Grid */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-l);
    margin: var(--spacing-xl) 0;
}

.feature-card {
    background-color: var(--md-sys-color-surface-container);
    padding: var(--spacing-l);
    border-radius: var(--radius-m);
    border: 1px solid var(--md-sys-color-outline);
    transition: background-color 0.2s;
}

/* Badge / Icon placeholders */
.icon-box {
    width: 48px;
    height: 48px;
    background-color: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
    border-radius: var(--radius-s);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-m);
    font-weight: bold;
    font-size: 1.2rem;
}

/* Document Page Styles (Privacy/Terms) */
.doc-content {
    background: var(--md-sys-color-surface-container);
    padding: 40px;
    border-radius: var(--radius-l);
    border: 1px solid var(--md-sys-color-outline);
    margin-bottom: 60px;
}

.doc-content h2 { margin-top: 32px; color: var(--md-sys-color-secondary); }
.doc-content ul { margin-bottom: 16px; padding-left: 24px; color: var(--md-sys-color-on-surface-variant); }
.doc-content li { margin-bottom: 8px; }

/* Footer */
footer {
    text-align: center;
    padding: 40px 0;
    color: var(--md-sys-color-on-surface-variant);
    font-size: 0.9rem;
    border-top: 1px solid var(--md-sys-color-outline);
    margin-top: auto;
}

footer a { color: var(--md-sys-color-secondary); }

/* Utility */
.highlight { color: var(--md-sys-color-secondary); }