/* Month Index Navigation */
.month-index-list {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    overflow-x: auto;
    scrollbar-width: none;
    /* Firefox */
    -ms-overflow-style: none;
    /* IE/Edge */
    white-space: nowrap;
    padding: 0.25rem;
    mask-image: linear-gradient(to right, transparent, black 10px, black 90%, transparent);
    /* Fade edges if needed, but maybe confusing for buttons */
    -webkit-mask-image: linear-gradient(to right, transparent 0%, black 10%, black 90%, transparent 100%);
    max-width: 400px;
    /* Limit width on desktop */
}

.month-index-list::-webkit-scrollbar {
    display: none;
}

.month-btn {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-secondary);
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s;
    flex-shrink: 0;
    font-family: var(--font-family);
}

.month-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.month-btn.active {
    background: var(--accent-primary);
    color: #fff;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

/* Tiny Icon Btn */
.icon-btn.tiny {
    padding: 0.1rem;
    width: 24px;
    height: 24px;
    font-size: 0.75rem;
}

/* Mobile Adjustments */
@media (max-width: 768px) {
    .month-index-list {
        max-width: 60vw;
        /* Allow scrolling on mobile */
        -webkit-mask-image: linear-gradient(to right, transparent 0%, black 5%, black 95%, transparent 100%);
    }
}