/* Section Base */
.levels-section {
    padding: 100px 0;
    background-color: var(--bg);
    overflow: hidden;
}

/* Tabs Navigation */
.tabs-container {
    margin-bottom: 2rem;
    position: relative;
}

.levels-tabs {
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    padding: 10px 0;
    scrollbar-width: none; /* Firefox */
    border-bottom: 1px solid var(--border);
}

.levels-tabs::-webkit-scrollbar { display: none; } /* Chrome/Safari */

.tab-item {
    white-space: nowrap;
    padding: 0.8rem 1.5rem;
    background: transparent;
    border: none;
    color: var(--muted);
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    border-bottom: 3px solid transparent;
}

.tab-item:hover { color: var(--primary); }

.tab-item.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

/* Content Cards */
.level-content-wrapper {
    position: relative;
    min-height: 350px;
}

.levels-card {
    display: none;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 3rem;
    box-shadow: var(--shadow);
}

.levels-card.active {
    display: block;
    animation: fadeInUp 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.level-name { font-size: 2.5rem; font-weight: 800; margin-bottom: 0.5rem; }
.level-duration { color: var(--secondary); font-weight: 600; display: flex; align-items: center; gap: 8px; }

.level-badge {
    background: var(--bg-soft);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    color: var(--primary);
}

.level-description {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--text);
    margin-bottom: 2rem;
}

/* Skills List */
.skills-title { font-size: 0.9rem; text-transform: uppercase; letter-spacing: 1px; color: var(--muted); margin-bottom: 1rem; }
.skills-list { display: flex; flex-wrap: wrap; gap: 0.8rem; }

.skill-tag {
    background: var(--bg-soft);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.skill-tag i { color: var(--success); font-size: 0.7rem; }

/* Timeline Roadmap */
.timeline-section {
    margin-top: 5rem;
    padding-top: 3rem;
    border-top: 1px solid var(--border);
}

.timeline-title { font-size: 1.2rem; margin-bottom: 2rem; text-align: center; }

.timeline-scroll {
    overflow-x: auto;
    padding: 20px 0;
    scrollbar-width: thin;
}

.timeline-track {
    display: flex;
    min-width: 1200px;
    justify-content: space-between;
    position: relative;
    padding: 0 40px;
}

.timeline-track::before {
    content: '';
    position: absolute;
    top: 10px;
    left: 40px;
    right: 40px;
    height: 2px;
    background: var(--border);
    z-index: 1;
}

.timeline-item {
    position: relative;
    z-index: 2;
    text-align: center;
    flex: 1;
}

.timeline-dot {
    width: 20px;
    height: 20px;
    background: var(--card);
    border: 4px solid var(--primary);
    border-radius: 50%;
    margin: 0 auto 15px;
}

.tl-name { display: block; font-weight: 700; font-size: 0.9rem; }
.tl-time { display: block; font-size: 0.75rem; color: var(--muted); }

.timeline-footer {
    text-align: center;
    margin-top: 3rem;
    color: var(--muted);
    font-size: 0.9rem;
}

/* Mobile Adjustments */
@media (max-width: 768px) {
    .level-card { padding: 1.5rem; }
    .level-name { font-size: 1.8rem; }
    .level-description { font-size: 1rem; }
    .card-header { flex-direction: column; gap: 1rem; }
}