.collage-container {
    display: grid;
    gap: 2px;
    width: 100%;
    aspect-ratio: 1 / 1;
    background-color: #f8f9fa;
    overflow: hidden;
}
.collage-grid-1 { grid-template-columns: 1fr; grid-template-rows: 1fr; }
.collage-grid-2 { grid-template-columns: 1fr 1fr; grid-template-rows: 1fr 1fr; }
.collage-grid-3 { grid-template-columns: repeat(3, 1fr); grid-template-rows: repeat(3, 1fr); }
.collage-grid-4 { grid-template-columns: repeat(4, 1fr); grid-template-rows: repeat(4, 1fr); }

.collage-item {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.collage-fallback {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #6c757d;
    color: white;
    font-weight: bold;
    text-transform: uppercase;
    font-size: clamp(1rem, 2vw, 2rem);
}

.station-check-overlay {
    position: absolute;
    top: 10px;
    right: 10px;
    font-size: 2rem;
    color: #0d6efd;
    background-color: white;
    border-radius: 50%;
    line-height: 1;
    opacity: 0;
    transition: opacity 0.2s ease-in-out;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    z-index: 10;
}

.btn-check:checked + label .station-check-overlay {
    opacity: 1;
}

.btn-check:checked + label .card {
    border: 2px solid #0d6efd !important;
}
.cursor-pointer { cursor: pointer; }

.discover-plus-circle {
    width: 120px;
    height: 120px;
    background-color: #dee2e6; /* Soft grey circle */
    transition: all 0.2s ease-in-out;
    cursor: pointer;
}

.discover-plus-circle i {
    font-size: 3.5rem;
    color: #6c757d; /* Medium grey icon color */
    transition: all 0.2s ease-in-out;
}

/* Hover effects for a big friendly feel */
.discover-plus-circle:hover {
    background-color: #6c757d; /* Darker grey background on hover */
    transform: scale(1.08); /* Gently pops out */
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15) !important;
}

.discover-plus-circle:hover i {
    color: #ffffff; /* White plus symbol on hover */
}