/* --- AVAILABLE SUBJECTS (Modern Chip Design) --- */
.subject-highlight-box {
    margin-bottom: 24px;
    padding: 0;
    position: relative;
    z-index: 10;
    mask-image: linear-gradient(to right, black 90%, transparent 100%);
    -webkit-mask-image: linear-gradient(to right, black 90%, transparent 100%);
}

.subject-highlight-box h4 {
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--text-dim);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    display: flex;
    align-items: center;
    gap: 8px;
}
.subject-highlight-box h4::before {
    content: "";
    display: inline-block;
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--accent);
}

.subject-tags {
    display: flex;
    flex-wrap: nowrap;
    gap: 10px;
    overflow-x: auto;
    padding: 10px 0; 
    scrollbar-width: none; 
    -ms-overflow-style: none;
    cursor: grab;
}
.subject-tags::-webkit-scrollbar {
    display: none; 
}

@media (max-width: 768px) {
    .subject-highlight-box {
        display: none;
    }
}

.subject-tag {
    flex: 0 0 auto;
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    color: var(--text-muted);
    padding: 4px 12px;
    border-radius: 999px; /* Pill design */
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid rgba(255,255,255,0.08);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    user-select: none;
}

.subject-tag:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-main);
    border-color: rgba(255,255,255,0.2);
    transform: translateY(-2px);
}

.subject-tag.active {
    background: rgba(168, 85, 247, 0.1);
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: 0 0 12px rgba(168, 85, 247, 0.15);
}