:root {
    --void: #000505; 
    --cold: #001a1a;
    --hot: #00ff99;  
    --flash: #ffffff;
    --anchor-cyan: #00e5ff;
}

body {
    background-color: var(--void);
    margin: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
    font-family: 'Courier New', Courier, monospace;
    user-select: none;
}

/* Topology Selector */
#manifold-selector {
    position: absolute;
    top: 20px;
    left: 20px;
    color: var(--hot);
    font-size: 0.8em;
    z-index: 100;
    border-left: 2px solid var(--anchor-cyan);
    padding-left: 10px;
}

#manifold-selector select {
    background: var(--cold);
    color: var(--hot);
    border: 1px solid rgba(0, 255, 153, 0.3);
    padding: 5px;
    font-family: 'Courier New', Courier, monospace;
    margin-left: 10px;
    outline: none;
    cursor: pointer;
}

/* Dynamic Flex Container for n-nodes */
#resonance-field {
    display: flex;
    gap: 10px;
    padding: 20px;
    height: 65vh;
    width: 90vw;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap; /* Critical for 10-node Orthogonal Matrix */
}

/* Soliton Node Base Physics */
.resonance-card {
    height: 100%;
    max-height: 500px;
    background-color: var(--cold);
    position: relative;
    overflow: hidden;
    border-right: 1px solid rgba(0, 255, 153, 0.2);
    will-change: width;
}

/* Holographic Interference Pattern */
.resonance-card::after {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: repeating-linear-gradient(
        transparent,
        transparent 4px,
        rgba(0, 255, 153, 0.05) 5px
    );
    pointer-events: none;
    z-index: 2;
}

.card-face {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background-size: cover;
    background-position: center;
    opacity: 0;
    filter: grayscale(100%) contrast(150%) sepia(100%) hue-rotate(130deg);
    transition: opacity 1.5s ease-in, filter 2s ease-out;
}

.resonance-card.revealed .card-face {
    opacity: 1;
    filter: grayscale(0%) contrast(100%) sepia(0%);
}

.card-label {
    position: absolute;
    bottom: -30px;
    width: 100%;
    padding: 10px 0;
    background: rgba(0, 5, 5, 0.9);
    color: var(--hot);
    text-align: center;
    font-size: 0.7em;
    letter-spacing: 1px;
    transition: bottom 0.5s ease 0.8s;
    z-index: 3;
}

.resonance-card.revealed .card-label {
    bottom: 0;
}

/* Interstitial Ad / Loading Space */
#interstitial-layer {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background: rgba(0, 5, 5, 0.95);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 500;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.interstitial-text {
    color: var(--anchor-cyan);
    margin-top: 20px;
    letter-spacing: 2px;
}

.spinner {
    width: 50px; height: 50px;
    border: 1px solid var(--cold);
    border-top: 1px solid var(--hot);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin { 100% { transform: rotate(360deg); } }

/* Global Status Overlay */
#ui-overlay {
    position: fixed;
    bottom: 20px;
    color: var(--hot);
    letter-spacing: 2px;
    font-size: 0.8em;
    pointer-events: none;
}