Constant MAIN_CSS_EXAMPLE 

pub const MAIN_CSS_EXAMPLE: &str = r#"
/* ── Layout ─────────────────────────────────────── */
.screen {
    flex-direction: column;
    align-items: center;
    padding: 24px;
    background: #f8f9fa;
}

/* ── Typography ──────────────────────────────────── */
.title {
    font-size: 28px;
    font-weight: bold;
    color: #1a1a2e;
    margin-bottom: 16px;
}

.label {
    font-size: 16px;
    color: #555;
    margin-bottom: 8px;
}

/* ── Buttons ─────────────────────────────────────── */
.primary-btn {
    background: #4CAF50;
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    margin-top: 12px;
}

.link-btn {
    background: transparent;
    color: #4CAF50;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 14px;
    margin-top: 8px;
}

.danger-btn {
    background: #e53935;
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    margin-top: 12px;
}

/* ── Inputs ──────────────────────────────────────── */
.text-input {
    background: white;
    border: 1.5px solid #ddd;
    border-radius: 8px;
    padding: 12px 16px;
    font-size: 16px;
    width: 100%;
    margin-top: 16px;
}

/* ── Avatar ──────────────────────────────────────── */
.avatar {
    width: 80px;
    height: 80px;
    border-radius: 40px;
    margin-bottom: 16px;
    border: 3px solid #4CAF50;
}
"#;

Bundled CSS string — embedded at compile time.

use bubba_core::css::StyleSheet;

// Embed at compile time for zero-cost access:
// static MAIN_CSS: &str = include_str!("../assets/main.css");

// Or parse inline:
let sheet = StyleSheet::parse(".title { font-size: 24px; }").unwrap();
assert_eq!(sheet.get("title", "font-size"), Some("24px"));