.section-nav-sidebar {
    position: fixed;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 100;
    display: flex;
    flex-direction: column;
    gap: 8px;
    background: var(--bg-white);
    padding: 12px 8px;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    border: 1px solid var(--border);
}

.section-nav-item {
    width: 44px;
    height: 44px;
    border-radius: 8px;
    border: none;
    background: var(--bg-gray);
    color: var(--text-gray);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 18px;
    position: relative;
}

.section-nav-item:hover {
    background: rgba(255, 111, 15, 0.1);
    color: var(--primary);
    transform: translateX(2px);
}

.section-nav-item::before {
    content: attr(title);
    position: absolute;
    left: calc(100% + 12px);
    top: 50%;
    transform: translateY(-50%);
    background: var(--text-dark);
    color: #fff;
    padding: 6px 10px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
    white-space: nowrap;
    z-index: 1000;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s ease, transform 0.2s ease;
    transform: translateY(-50%) translateX(-4px);
}

.section-nav-item::after {
    content: '';
    position: absolute;
    left: calc(100% + 6px);
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-top: 5px solid transparent;
    border-bottom: 5px solid transparent;
    border-right: 6px solid var(--text-dark);
    z-index: 1001;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s ease, transform 0.2s ease;
    transform: translateY(-50%) translateX(-4px);
}

.section-nav-item:hover::before {
    opacity: 1;
    transform: translateY(-50%) translateX(0);
}

.section-nav-item:hover::after {
    opacity: 1;
    transform: translateY(-50%) translateX(0);
}

.section-nav-item.active {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 2px 8px rgba(255, 111, 15, 0.3);
}

.section-nav-item.active:hover {
    background: var(--primary-dark);
    color: #fff;
}

.section-nav-item.active::before {
    background: var(--primary);
}

.section-nav-item.active::after {
    border-right-color: var(--primary);
}

.section-nav-item i {
    font-size: 18px;
}

@media (max-width: 768px) {
    .section-nav-sidebar {
        display: none;
    }
}