/* Sheen theme – original Gemini-style: very subtle lilac + icy-blue, no animation, no noise */
:root[data-theme="sheen"] {
    --primary-orange: #ffb3a7;
    --primary-red: #ff9f9f;
    --accent-orange: #ff8c7a;
    --accent-red: #ff7a7a;
    --dark-orange: #d97757;
    --title-gradient: linear-gradient(135deg, var(--accent-orange), var(--accent-red));
    --sheen-lilac: #ede6ff;
    --sheen-icy-blue: #dbf0ff;
}

/* Sheen background: soft base + subtle lilac and icy-blue only (static, no overlay) */
body[data-theme="sheen"]:not(.dark-mode) {
    background-color: #f9f8f7;
    background-image:
        radial-gradient(at 0% 0%, rgba(237, 230, 255, 0.35) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(219, 240, 255, 0.3) 0px, transparent 50%),
        linear-gradient(135deg, #f9f8f7 0%, #fcfbfa 55%, #f6f5f4 100%);
    background-size: 100% 100%;
    background-position: 0% 0%;
}