#skill-tree-root {
    position: relative;
    padding: 20px 0;
}

.skill-branch {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0 10px;
}

.skill-branch-title {
    font-family: var(--font-pixel);
    font-size: 1.8rem;
    margin-bottom: 30px;
    text-shadow: 2px 2px 0px #000;
    z-index: 1;
    position: relative;
}

.skill-branch::before {
    content: '';
    position: absolute;
    top: 40px;
    bottom: 70px;
    left: 50%;
    width: 4px;
    background-color: var(--skill-connector);
    transform: translateX(-50%);
    z-index: 0;
    box-shadow: inset 1px 0 rgba(255,255,255,0.1);
}

.skill-row {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 40px;
    position: relative;
    z-index: 1;
    width: 100%;
}

.skill-row.multi-item::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 35%;
    right: 35%;
    height: 4px;
    background-color: var(--skill-connector);
    z-index: -1;
    transform: translateY(-50%);
}

.skill-node {
    width: 64px;
    height: 64px;
    background-color: var(--skill-node-bg);
    border: 4px solid var(--skill-node-border);
    border-radius: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    cursor: pointer;
    box-shadow: 4px 4px 0px var(--skill-node-shadow);
}

.skill-node i {
    font-size: 32px;
    color: var(--skill-node-icon);
    transition: color 0.3s;
}

.skill-node:hover {
    transform: scale(1.15) translateY(-5px);
    border-color: var(--accent);
    z-index: 10;
}

.skill-node:hover i {
    color: #fff;
    filter: drop-shadow(0 0 5px currentColor);
}

.branch-frontend .skill-node:hover {
    border-color: rgb(var(--bs-danger-rgb));
}

.branch-backend .skill-node:hover {
    border-color: rgb(var(--bs-success-rgb));
}

.branch-tools .skill-node:hover {
    border-color: rgb(var(--bs-primary-rgb));
}

.skill-tooltip {
    position: absolute;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%) scale(0);
    width: 200px;
    background-color: var(--skill-tooltip-bg);
    border: 2px solid var(--text-color);
    padding: 10px;
    border-radius: 0;
    opacity: 0;
    transition: all 0.2s;
    pointer-events: none;
    text-align: center;
    z-index: 1000;
    box-shadow: 0 0 10px var(--skill-tooltip-shadow);
}

.skill-node:hover .skill-tooltip {
    opacity: 1;
    transform: translateX(-50%) scale(1);
}

.tooltip-title {
    color: var(--accent);
    font-family: var(--font-pixel);
    font-size: 1.2rem;
    margin-bottom: 5px;
    display: block;
}

.tooltip-level {
    font-size: 0.9rem;
    color: var(--skill-tooltip-muted);
    margin-bottom: 5px;
    display: block;
}

.tooltip-bar {
    width: 100%;
    height: 6px;
    background: var(--skill-connector);
    border: 1px solid #fff;
    position: relative;
}

.tooltip-bar-fill {
    height: 100%;
    background-color: var(--accent);
    width: 0%;
}

[data-bs-theme="light"] .skill-branch-title {
    text-shadow: 2px 2px 0 rgba(2, 2, 2, 0.65);
}

[data-bs-theme="light"] .skill-node:hover i {
    color: #111;
    filter: none;
}