body, html {
    overscroll-behavior: none;
    font-family: 'Inter', sans-serif;
}
#game-wrapper {
    height: 100vh; /* Fallback for browsers */
    height: calc(var(--vh, 1vh) * 100);
}
.btn {
    font-weight: bold;
    padding-top: 1rem;
    padding-bottom: 1rem;
    padding-left: 2rem;
    padding-right: 2rem;
    border-radius: 0.5rem;
    font-size: 1.25rem;
    transition-property: transform;
    transform: scale(1);
}
.btn:hover {
    transform: scale(1.05);
}
.card {
    transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.3s ease, background-color 0.2s ease, border-color 0.2s ease;
    position: relative; /* Needed for tooltip positioning */
}
.card.selected {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}
.card.matched {
    animation: match-animation 0.5s ease-out;
}
.card.incorrect {
    animation: incorrect-animation 0.5s ease;
}
.card[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 105%;
    left: 50%;
    transform: translateX(-50%);
    background-color: #374151;
    color: #fff;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1.25;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, visibility 0.2s;
    z-index: 10;
}
.card[data-tooltip]:hover::after {
    opacity: 1;
    visibility: visible;
}
@keyframes match-animation {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); background-color: #4ade80; }
    100% { transform: scale(1); opacity: 0; }
}
@keyframes incorrect-animation {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}
.progress-bar-inner {
    transition: width 0.5s ease-in-out;
}