body {
    font-family: 'Roboto', sans-serif;
    background-color: #0c1a1e;
    background-image: 
        linear-gradient(rgba(12, 26, 30, 0.8), rgba(12, 26, 30, 0.95)),
        url('https://placehold.co/1200x800/0c1a1e/FFFFFF?text=Mystical+Forest');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}
.app-container {
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    background-color: rgba(0, 29, 36, 0.6);
    border: 1px solid rgba(13, 177, 125, 0.2);
}
.title-font {
    font-family: 'Cormorant Garamond', serif;
}
.card {
    width: 150px;
    height: 225px;
    perspective: 1000px;
    position: relative;
    background-color: transparent;
    border-radius: 12px;
}
.card-inner {
    position: absolute;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.8s;
    transform-style: preserve-3d;
    border-radius: 12px;
}
.card.flipped .card-inner {
    transform: rotateY(180deg);
}
.card-front, .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 1rem;
}
.card-front {
    background-color: #0d3c3f;
    color: #e0f2f1;
    border: 2px solid #0db17d;
    background-image:
        radial-gradient(circle at top left, rgba(13, 177, 125, 0.3), transparent 60%),
        radial-gradient(circle at bottom right, rgba(20, 83, 110, 0.3), transparent 70%);
}
.card-back {
    background-color: #e0f2f1;
    color: #0c1a1e;
    transform: rotateY(180deg);
    border: 2px solid #a0a0a0;
    flex-direction: column;
}
.btn-primary {
    background-color: #0db17d;
    color: #ffffff;
    transition: background-color 0.3s, transform 0.2s;
}
.btn-primary:hover {
    background-color: #0aa16f;
    transform: translateY(-2px);
}
.mode-btn {
     background-color: rgba(13, 177, 125, 0.2);
     border: 1px solid rgba(13, 177, 125, 0.4);
     color: #a3e0d2;
}
.mode-btn.active {
    background-color: #0db17d;
    color: white;
    font-weight: bold;
}

/* Styles for the new card count buttons */
.count-btn {
    background-color: rgba(13, 177, 125, 0.1);
    border: 1px solid transparent;
    color: #a3e0d2;
    margin: 0 4px; /* Slight spacing between buttons */
    transition: all 0.2s;
}
.count-btn.active {
    background-color: #0db17d;
    color: white;
    font-weight: bold;
    border-color: #0db17d;
}

.custom-select {
    background-color: rgba(12, 26, 30, 0.7);
    border: 1px solid rgba(13, 177, 125, 0.3);
    color: white;
}
.loader {
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top: 4px solid #0db17d;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}