/* Skill Tree */
.skill-tree {
    display: flex;
    flex-direction: column;
    gap: 0;
    max-width: 600px;
    margin: 0 auto;
    position: relative;
    padding: 1rem 0;
}

.skill-node {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    padding: 0.5rem 0;
}

.skill-node.align-start { align-self: flex-start; margin-left: 5%; }
.skill-node.align-end { align-self: flex-end; margin-right: 5%; }

.skill-node .skill-card {
    width: 280px;
    max-width: 90vw;
    border-left: 3px solid var(--node-color, var(--teletraan-border));
    transition: all 0.2s;
}

.skill-node.locked .skill-card {
    opacity: 0.4;
    border-left-color: var(--teletraan-text-dim);
    cursor: not-allowed;
    filter: grayscale(0.5);
}
.skill-node.locked .skill-card:hover {
    transform: none;
    box-shadow: none;
}

.skill-node.completed .skill-card {
    border-left-color: var(--teletraan-cyan);
    box-shadow: 0 0 8px rgba(43, 166, 179, 0.1);
}

/* Path connector */
.skill-path {
    position: absolute;
    bottom: -10px;
    left: 50%;
    width: 2px;
    height: 20px;
    background: var(--teletraan-border);
    z-index: 0;
}
.skill-path.path-complete {
    background: var(--teletraan-cyan);
    box-shadow: 0 0 4px rgba(43, 166, 179, 0.4);
}

.module-title {
    font-family: 'Rajdhani', sans-serif;
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}

/* Daily challenge card */
.daily-card {
    border-color: var(--streak-color) !important;
    animation: dailyGlow 2s ease-in-out infinite alternate;
}
@keyframes dailyGlow {
    from { box-shadow: 0 0 0 rgba(255, 179, 0, 0); }
    to { box-shadow: 0 0 16px rgba(255, 179, 0, 0.15), 0 0 4px rgba(255, 179, 0, 0.1); }
}

@media (max-width: 576px) {
    .skill-node.align-start,
    .skill-node.align-end {
        align-self: center;
        margin-left: 0;
        margin-right: 0;
    }
    .skill-node .skill-card { width: 100%; }
}