:root {
        --primary-color: #0f172a;
        --primary-dark: #1e293b;
        --secondary-color: #94a3b8;
        --accent-color: #22c55e;
        --success-color: #10b981;
        --warning-color: #facc15;
        --danger-color: #ef4444;
        --dark-color: #1e293b;
        --light-color: #f1f5f9;
        --sidebar-width: 280px;
    }

    * {
        font-family: 'Inter', system-ui, -apple-system, sans-serif;
    }

    body {
        background-color: var(--light-color);
        color: var(--dark-color);
        overflow-x: hidden;
    }

    /* Sidebar */
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        height: 100vh;
        width: var(--sidebar-width);
        background: var(--primary-color);
        color: white;
        z-index: 1050;
        box-shadow: 4px 0 20px rgba(0,0,0,0.1);
    }

    .sidebar-header {
        padding: 1.5rem;
        border-bottom: 1px solid rgba(255,255,255,0.05);
        background: rgba(255,255,255,0.02);
    }

    .sidebar-brand {
        font-size: 1.5rem;
        font-weight: 700;
        color: white;
        text-decoration: none;
        display: flex;
        align-items: center;
        gap: 0.75rem;
    }

    .sidebar-brand img {
        height: 60px;
        width: 60px;
        border-radius: 50%;
        object-fit: cover;
        border: 2px solid var(--accent-color);
        transition: all 0.3s ease;
    }

    .sidebar-brand:hover img {
        transform: scale(1.05);
    }

    .sidebar-nav {
        padding: 1rem 0;
        height: calc(100vh - 100px);
        overflow-y: auto;
    }

    .sidebar-nav .nav-link {
        color: rgba(255,255,255,0.75);
        padding: 0.75rem 1.5rem;
        display: flex;
        align-items: center;
        gap: 0.75rem;
        font-weight: 500;
        border-left: 4px solid transparent;
        transition: all 0.2s ease;
    }

    .sidebar-nav .nav-link:hover {
        background: rgba(34,197,94,0.08);
        color: white;
        border-left-color: var(--accent-color);
    }

    .sidebar-nav .nav-link.active {
        background: rgba(34,197,94,0.15);
        color: white;
        border-left-color: var(--accent-color);
    }

    .sidebar-nav .nav-link i {
        width: 20px;
        text-align: center;
    }

    /* Top Navigation */
    .top-nav {
        background: white;
        box-shadow: 0 2px 10px rgba(0,0,0,0.08);
        padding: 1rem 0;
        position: sticky;
        top: 0;
        z-index: 1040;
        margin-left: var(--sidebar-width);
    }

    .top-nav .navbar-brand {
        font-weight: 700;
        color: var(--primary-color);
        font-size: 1.5rem;
    }

    /* User Dropdown */
    .user-dropdown {
        background: white;
        border: 1px solid #e2e8f0;
        border-radius: 12px;
        padding: 0.5rem;
        display: flex;
        align-items: center;
        gap: 0.5rem;
        cursor: pointer;
        transition: all 0.3s ease;
    }

    .user-dropdown:hover {
        background: var(--light-color);
        border-color: var(--accent-color);
    }

    .user-avatar {
        width: 40px;
        height: 40px;
        border-radius: 50%;
        background: linear-gradient(135deg, var(--accent-color), var(--success-color));
        display: flex;
        align-items: center;
        justify-content: center;
        color: white;
        font-weight: 600;
    }

    /* Main Content */
    .main-content {
        margin-left: var(--sidebar-width);
        min-height: 100vh;
        padding: 2rem;
        padding-top: 1rem;
    }

    /* Cards */
    .card {
        border: none;
        border-radius: 12px;
        box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
        transition: all 0.3s ease;
    }

    .card:hover {
        box-shadow: 0 10px 25px -5px rgba(0,0,0,0.05);
        transform: translateY(-2px);
    }

    .card-header {
        background: var(--primary-dark);
        color: white;
        border-radius: 12px 12px 0 0;
        padding: 1rem 1.5rem;
        font-weight: 600;
    }

    /* Buttons */
    .btn-primary-custom {
        background: linear-gradient(135deg, var(--accent-color), var(--success-color));
        border: none;
        color: white;
        padding: 0.5rem 1.5rem;
        border-radius: 8px;
        font-weight: 500;
        transition: all 0.3s ease;
    }

    .btn-primary-custom:hover {
        background: linear-gradient(135deg, var(--success-color), var(--accent-color));
        transform: translateY(-1px);
        box-shadow: 0 4px 12px rgba(34, 197, 94, 0.4);
    }

    .btn-success-custom {
        background: linear-gradient(135deg, var(--success-color), #059669);
        border: none;
        color: white;
        padding: 0.5rem 1.5rem;
        border-radius: 8px;
        font-weight: 500;
        transition: all 0.3s ease;
    }

    .btn-success-custom:hover {
        background: linear-gradient(135deg, #059669, var(--success-color));
        transform: translateY(-1px);
        box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
    }

    /* Table */
    .table {
        background: white;
        border-radius: 12px;
        overflow: hidden;
        box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
    }

    .table thead th {
        background: var(--primary-dark);
        color: white;
        padding: 1rem;
        border: none;
        font-weight: 600;
    }

    .table tbody tr:hover {
        background: rgba(15, 23, 42, 0.05);
    }

    /* Logout */
    .logout-btn {
        border: none;
        background: none;
        color: rgba(255,255,255,0.75);
        padding: 0.75rem 1.5rem;
        width: 100%;
        text-align: left;
        display: flex;
        align-items: center;
        gap: 0.75rem;
        font-weight: 500;
        border-left: 4px solid transparent;
        transition: all 0.2s ease;
    }

    .logout-btn:hover {
        background: rgba(239, 68, 68, 0.1);
        color: white;
        border-left-color: var(--danger-color);
    }

    /* Breadcrumb */
    .breadcrumb-custom {
        background: white;
        border-radius: 12px;
        padding: 1rem 1.5rem;
        margin-bottom: 2rem;
        box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    }

    .breadcrumb-custom .breadcrumb-item + .breadcrumb-item::before {
        content: "›";
        color: var(--secondary-color);
    }

    /* Text Utility */
    .text-primary-custom {
        color: var(--accent-color) !important;
    }

    .bg-primary-custom {
        background: var(--primary-dark) !important;
    }

    .text-gradient {
        background: linear-gradient(135deg, var(--accent-color), var(--success-color));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }

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

    .sidebar-nav::-webkit-scrollbar-track {
        background: rgba(255,255,255,0.05);
    }

    .sidebar-nav::-webkit-scrollbar-thumb {
        background: rgba(255,255,255,0.2);
        border-radius: 3px;
    }

    .sidebar-nav::-webkit-scrollbar-thumb:hover {
        background: rgba(255,255,255,0.35);
    }