:root {
    --neon-pink: #ff00ff;
    --neon-blue: #00ffff;
    --neon-purple: #bc13fe;
    --bg-dark: #050505;
}

body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: var(--bg-dark);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: white;
    touch-action: none;
}

#game-container {
    position: relative;
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

canvas {
    display: block;
}

/* UI Overlays */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: rgba(5, 5, 5, 0.9);
    z-index: 10;
    text-align: center;
    transition: opacity 0.5s ease;
}

.hidden {
    display: none !important;
    opacity: 0;
}

h1 {
    font-size: 2.5rem;
    color: var(--neon-blue);
    text-shadow: 0 0 10px var(--neon-blue), 0 0 20px var(--neon-purple);
    margin-bottom: 2rem;
}

.btn {
    padding: 15px 40px;
    font-size: 1.2rem;
    background: transparent;
    color: var(--neon-pink);
    border: 2px solid var(--neon-pink);
    border-radius: 50px;
    cursor: pointer;
    box-shadow: 0 0 10px var(--neon-pink);
    text-transform: uppercase;
    letter-spacing: 2px;
    transition: all 0.3s;
}

.btn:active {
    background: var(--neon-pink);
    color: white;
    box-shadow: 0 0 30px var(--neon-pink);
}

/* Sibling Mode Toggle */
.toggle-container {
    margin-top: 2rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}

.switch input { opacity: 0; width: 0; height: 0; }

.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: #333;
    transition: .4s;
    border-radius: 34px;
    border: 1px solid var(--neon-blue);
}

.slider:before {
    position: absolute;
    content: "";
    height: 26px; width: 26px;
    left: 4px; bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider { background-color: var(--neon-purple); }
input:checked + .slider:before { transform: translateX(26px); }

/* Card Popup */
#reveal-card {
    background: linear-gradient(135deg, #1a1a1a 0%, #000 100%);
    border: 3px solid var(--neon-blue);
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 0 40px var(--neon-blue);
    max-width: 80%;
    transform: scale(0.8);
    animation: popIn 0.5s forwards cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes popIn {
    to { transform: scale(1); }
}

.placeholder-img {
    width: 250px;
    height: 180px;
    background: #222;
    border: 1px dashed var(--neon-pink);
    margin: 20px auto;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    border-radius: 10px;
}

.placeholder-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.sibling-photo-container {
    position: absolute;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: 2px solid var(--neon-blue);
    overflow: hidden;
    pointer-events: none;
    z-index: 5;
    background: #222;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 0 10px var(--neon-blue);
}

.sibling-photo-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}