<style>
    #favicon-preview {
        width: 24px;
        height: 24px;
        border-radius: 4px;
        background-color: #333;
        display: inline-block;
        vertical-align: middle;
        margin-left: 8px;
    }

    .concept {
        width: 64px;
        height: 64px;
        display: flex;
        justify-content: center;
        align-items: center;
        flex-direction: column;
        /*gap: 16px;*/
    }

    .icon {
        width: 64px;
        height: 64px;
        display: flex;
        justify-content: center;
        align-items: center;
        font-size: 48px;
        user-select: none;
    }

    /* 1. Deep Dive Lambda */
    .deep-dive {
        background-color: #0A192F;
        border-radius: 8px;
        color: #00CED1;
        font-weight: 700;
        box-shadow:
            0 0 4px #00CED1,
            0 0 12px #00CED1;
    }

    /* 2. Ghost Lambda */
    .ghost {
        background-color: #F0F8FFCC;
        /* semi-transparent AliceBlue */
        border-radius: 8px;
        color: #008B8B;
        font-weight: 800;
        text-shadow:
            0 0 1px rgba(0, 0, 0, 0.2);
    }

    /* 3. Circle of Logic */
    .circle {
        background-color: #1E90FF;
        border-radius: 50%;
        color: #E0FFFF;
        font-weight: 600;
    }

    .label {
        font-size: 0.875rem;
        text-align: center;
        max-width: 128px;
        line-height: 1.2;
        user-select: none;
    }

    div.concept {
        display: none;
    }

    div.concept#favicon1 {
        display: inline-block;
    }
</style>
<section id="favicon-preview">
    <div class="concept" id="favicon1">
        <div class="icon deep-dive">λ</div>
        <!-- div class="label">Deep Dive Lambda<br><small>Dark navy background, glowing cyan λ</small></div -->
    </div>

    <div class="concept" id="favicon2">
        <div class="icon ghost">λ</div>
        <!-- div class="label">Ghost Lambda<br><small>Light transparent background, solid cyan λ</small></div -->
    </div>

    <div class="concept" id="favicon3">
        <div class="icon circle">λ</div>
        <!-- div class="label">Circle of Logic<br><small>Blue circle, white/light cyan λ</small></div -->
    </div>
</section>