@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@400;500;700;900&display=swap');

body {
    font-family: 'Noto Sans TC', sans-serif;
}

.math-line {
    font-size: 28px;
    font-weight: 700;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    line-height: 1.8;
    margin: 14px 0;
}

.math,
.math-display {
    display: inline-flex;
    align-items: center;
    vertical-align: middle;
}

.math-display {
    justify-content: center;
    width: 100%;
    overflow-x: auto;
    padding: 8px 0;
}

.katex {
    font-size: 1.12em;
}

.slot {
    min-width: 58px;
    min-height: 46px;
    padding: 4px 12px;
    border: 3px solid #93c5fd;
    border-radius: 12px;
    background: #eff6ff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #1d4ed8;
    cursor: pointer;
    font-size: 26px;
    font-weight: 800;
    transition: all 0.2s ease;
}

.slot.active {
    animation: pulseSlot 1s infinite;
    background: #dbeafe;
    border-color: #2563eb;
}

.slot.correct {
    background: #dcfce7;
    border-color: #22c55e;
    color: #166534;
    cursor: default;
}

@keyframes pulseSlot {
    0% {
        box-shadow: 0 0 0 0 rgba(37, 99, 235, 0.45);
    }

    70% {
        box-shadow: 0 0 0 8px rgba(37, 99, 235, 0);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(37, 99, 235, 0);
    }
}

.no-scrollbar::-webkit-scrollbar {
    display: none;
}

.no-scrollbar {
    -ms-overflow-style: none;
    scrollbar-width: none;
}