:root {
    --cg-ink: #1f2328;
    --cg-bg: #fff;
    --cg-dim: rgba(0,0,0,.55);
    --cg-line: #e7dfd6;
}

#cg-howto {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: none;
}

    #cg-howto[aria-hidden="false"] {
        display: block;
    }

    /* backdrop + panel */
    #cg-howto .cg-backdrop {
        position: absolute;
        inset: 0;
        background: var(--cg-dim);
    }

    #cg-howto .cg-panel {
        position: absolute;
        left: 50%;
        top: 8vh;
        transform: translateX(-50%);
        width: min(860px, calc(100% - 2rem));
        max-height: 84vh;
        overflow: auto;
        background: var(--cg-bg);
        color: var(--cg-ink);
        border: 1px solid var(--cg-line);
        border-radius: 14px;
        box-shadow: 0 20px 60px rgba(0,0,0,.35);
        padding: 1rem 1.25rem 1.25rem;
    }

    /* basic typography */
    #cg-howto h2 {
        margin: .1rem 0 .75rem;
        font-size: 1.6rem;
        line-height: 1.2;
    }

    #cg-howto h3 {
        margin: 1rem 0 .4rem;
        font-size: 1.2rem;
        line-height: 1.25;
    }

    #cg-howto p {
        margin: .65rem 0;
    }

    #cg-howto ul {
        margin: .4rem 0 .6rem 1.25rem;
    }

    /* close button */
    #cg-howto .cg-close {
        position: absolute;
        top: .5rem;
        right: .5rem;
        border: 1px solid var(--cg-line);
        background: #fff;
        color: inherit;
        border-radius: 10px;
        padding: .35rem .6rem;
        font-size: 1.1rem;
        line-height: 1;
        cursor: pointer;
    }

        #cg-howto .cg-close:hover {
            background: #fff7ee;
            border-color: #efd8c2;
        }

/* optional helper if you want a small inline button */
.cg-btn {
    border: 1px solid var(--cg-line);
    background: #fff;
    border-radius: 10px;
    padding: .45rem .7rem;
    cursor: pointer;
}