.sidebar {
    width: var(--sidebar-width);
    background-color: #0F172A;
    color: #E2E8F0;
    display: flex;
    flex-direction: column;
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    z-index: 100;
    transition: width 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
    border-right: 1px solid #1E293B;
}

.sidebar.collapsed {
    width: var(--sidebar-collapsed);
}

.sidebar-header {
    padding: 12px 16px;
    border-bottom: 1px solid #1E293B;
    display: flex;
    align-items: center;
    height: var(--topnav-height);
    flex-shrink: 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
}

.logo-image {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    object-fit: contain;
    flex-shrink: 0;
}

.logo-text {
    font-size: 16px;
    font-weight: 700;
    color: #FFFFFF;
    letter-spacing: -0.5px;
    flex-shrink: 0;
}

.sidebar.collapsed .logo-text {
    display: none;
}

.sidebar.collapsed .logo {
    justify-content: center;
    padding-left: 0;
}

.sidebar-nav {
    flex: 1;
    padding: 8px 0;
    overflow-y: auto;
    overflow-x: hidden;
}

.sidebar-nav::-webkit-scrollbar {
    width: 6px;
}

.sidebar-nav::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar-nav::-webkit-scrollbar-thumb {
    background: #334155;
    border-radius: 3px;
}

.sidebar-nav::-webkit-scrollbar-thumb:hover {
    background: #475569;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 20px;
    border-radius: 0 8px 8px 0;
    cursor: pointer;
    transition: all 0.15s ease;
    margin: 2px 0;
    position: relative;
}

.nav-item:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.nav-item-active {
    background-color: rgba(0, 163, 196, 0.12);
    color: var(--primary-color);
}

.nav-item-active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 20px;
    background-color: var(--primary-color);
    border-radius: 0 2px 2px 0;
}

.nav-icon {
    font-size: 18px;
    width: 24px;
    text-align: center;
    flex-shrink: 0;
}

.nav-label {
    font-size: 14px;
    font-weight: 500;
    flex-shrink: 0;
}

.sidebar.collapsed .nav-label {
    display: none;
}

.sidebar.collapsed .nav-item {
    padding: 10px 0;
    justify-content: center;
    border-radius: 8px;
}

.sidebar.collapsed .nav-item-active::before {
    display: none;
}

.nav-divider {
    height: 1px;
    background-color: #1E293B;
    margin: 12px 16px;
}

.l1-group {
    margin-bottom: 2px;
}

.l1-title {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 20px;
    font-size: 11px;
    font-weight: 600;
    color: #64748B;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: color 0.15s ease;
}

.l1-title:hover {
    color: #94A3B8;
}

.l1-arrow {
    font-size: 10px;
    transition: transform 0.2s ease;
    flex-shrink: 0;
}

.l1-title.expanded .l1-arrow {
    transform: rotate(90deg);
}

.sidebar.collapsed .l1-title {
    display: none;
}

.l2-items {
    display: none;
    padding-left: 4px;
}

.l1-group.expanded .l2-items {
    display: block;
}

.l2-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 20px;
    padding-left: 44px;
    border-radius: 0 8px 8px 0;
    cursor: pointer;
    transition: all 0.15s ease;
    font-size: 13px;
    color: #94A3B8;
    position: relative;
}

.l2-item:hover {
    background-color: rgba(255, 255, 255, 0.03);
    color: #E2E8F0;
    padding-left: 46px;
}

.l2-item.active {
    background-color: rgba(0, 163, 196, 0.1);
    color: var(--primary-color);
}

.l2-item.active::before {
    content: '';
    position: absolute;
    left: 32px;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    background-color: var(--primary-color);
    border-radius: 50%;
}

.sidebar.collapsed .l2-items {
    display: none;
}

.sidebar.collapsed .nav-item:hover .nav-tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateX(8px);
}

.nav-tooltip {
    position: absolute;
    left: 100%;
    top: 50%;
    transform: translateY(-50%) translateX(4px);
    background-color: #1E293B;
    color: #F1F5F9;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.15s ease;
    pointer-events: none;
    z-index: 1000;
    border: 1px solid #334155;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.nav-tooltip::before {
    content: '';
    position: absolute;
    right: 100%;
    top: 50%;
    transform: translateY(-50%);
    border: 5px solid transparent;
    border-right-color: #1E293B;
}

@media (max-width: 1024px) {
    .sidebar {
        width: var(--sidebar-collapsed);
    }
    .sidebar-header {
        padding: 16px 0;
    }
    .logo-text {
        display: none;
    }
    .nav-label {
        display: none;
    }
    .l1-title {
        display: none;
    }
    .nav-item {
        padding: 10px 0;
        justify-content: center;
        border-radius: 8px;
    }
    .nav-item-active::before {
        display: none;
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }
    .sidebar.open {
        transform: translateX(0);
    }
}