:root {
            --bg-white: #ffffff;
            --bg-placeholder: #f4f5f8;
            --border-light: #f1f1f4;
            --text-dark: #181c32;
            --text-gray: #5e6278;
            --text-muted: #a1a5b7;
            --primary: #3e97ff;
            
            /* Sidebar Dark Theme variables */
            --side-bg: #0f1015; /* Very dark background */
            --side-bg-hover: rgba(255,255,255,0.06);
            --side-text: #8c8f9b;
            --side-text-active: #ffffff;
            --side-border: rgba(255,255,255,0.08);
            
            --radius-lg: 12px;
            --sidebar-width: 280px;
        }

        * {
            box-sizing: border-box;
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
            margin: 0;
            padding: 0;
        }

        body {
            background-color: var(--bg-white);
            color: var(--text-dark);
            height: 100vh;
            display: flex;
            overflow: hidden;
        }

        /* Sidebar Styling */
        .sidebar {
            width: var(--sidebar-width);
            background-color: var(--side-bg);
            display: flex;
            flex-direction: column;
            flex-shrink: 0;
            transition: all 0.2s;
            border-right: 1px solid #1c1c24;
        }

        /* Brand & Logo */
        .brand {
            height: 70px;
            display: flex;
            align-items: center;
            padding: 0 25px;
            justify-content: space-between;
        }
        
        .brand-info {
            display: flex;
            align-items: center;
            gap: 12px;
            text-decoration: none;
        }

        .logo-box {
            width: 28px;
            height: 28px;
            background: rgba(30, 215, 120, 0.1); 
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .logo-box svg {
            width: 16px;
            height: 16px;
            color: #1ed778; /* Glowing green M */
        }

        .brand-name {
            font-size: 16px;
            font-weight: 600;
            color: white;
            letter-spacing: -0.2px;
        }

        .brand-actions {
            color: var(--side-text);
            display: flex;
            gap: 5px;
            font-size: 12px;
        }

        /* Add New Button Group */
        .sidebar-action-box {
            padding: 0 25px 20px 25px;
            display: flex;
            gap: 8px;
        }

        .btn-add-new {
            flex: 1;
            background-color: #1f202a;
            border: 1px solid #2a2b36;
            color: white;
            font-size: 12px;
            font-weight: 500;
            padding: 10px;
            border-radius: 6px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            transition: 0.2s;
        }
        .btn-add-new:hover {
            background-color: #2a2b36;
        }

        .btn-add-icon {
            background-color: #1f202a;
            border: 1px solid #2a2b36;
            color: var(--side-text);
            width: 38px;
            border-radius: 6px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            font-size: 12px;
        }

        /* Navigation Menu */
        .sidebar-nav {
            flex: 1;
            overflow-y: auto;
            padding: 0 15px;
        }
        .sidebar-nav::-webkit-scrollbar { display: none; }

        .menu-section {
            font-size: 11px;
            font-weight: 600;
            color: #4b4d5a;
            letter-spacing: 0.5px;
            text-transform: uppercase;
            padding: 15px 10px 10px 10px;
        }

        .nav-item {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 10px 10px;
            text-decoration: none;
            color: var(--side-text);
            font-size: 13px;
            font-weight: 500;
            border-radius: 6px;
            margin-bottom: 2px;
            transition: all 0.2s;
        }

        .nav-item-left {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .nav-item i.nav-icon {
            font-size: 14px;
            width: 16px;
            text-align: center;
        }

        .nav-item:hover {
            color: var(--side-text-active);
        }

        .nav-item.active {
            background-color: var(--side-bg-hover);
            color: var(--side-text-active);
        }

        .nav-arrow {
            font-size: 9px;
            opacity: 0.5;
            transition: transform 0.2s ease;
        }

        /* Dropdown specific styles */
        .nav-wrapper.has-dropdown {
            display: flex;
            flex-direction: column;
            width: 100%;
        }

        .sub-menu {
            display: none;
            flex-direction: column;
            padding-left: 36px;
            margin-top: 2px;
            margin-bottom: 5px;
        }

        .nav-wrapper.expanded .sub-menu {
            display: flex;
        }

        .nav-wrapper.expanded .nav-arrow {
            transform: rotate(90deg);
        }

        .sub-nav-link {
            padding: 8px 10px;
            color: var(--side-text);
            font-size: 13px;
            font-weight: 500;
            text-decoration: none;
            border-radius: 6px;
            transition: all 0.2s;
        }

        .sub-nav-link:hover {
            color: var(--side-text-active);
            background: var(--side-bg-hover);
        }

        /* Outline specific list */
        .outline-icon {
            font-size: 14px;
            width: 16px;
            text-align: center;
        }

        /* Sidebar Footer */
        .sidebar-footer {
            padding: 15px 25px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-top: 1px solid #1c1c24;
        }

        .user-avatar {
            width: 34px;
            height: 34px;
            border-radius: 50%;
            object-fit: cover;
        }

        .footer-actions {
            display: flex;
            gap: 10px;
            color: var(--side-text);
            font-size: 13px;
        }

        /* Main Content wrapper */
        .main-wrapper {
            flex: 1;
            display: flex;
            flex-direction: column;
            overflow: hidden;
            background-color: var(--bg-white);
        }

        /* Toolbar / Sub Header */
        .toolbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 35px;
            background-color: var(--bg-white);
            flex-shrink: 0;
            height: 80px;
        }

        .page-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 6px;
            letter-spacing: -0.2px;
        }

        .breadcrumbs {
            font-size: 12px;
            color: var(--text-muted);
            font-weight: 500;
        }

        .breadcrumbs a {
            color: var(--text-muted);
            text-decoration: none;
            transition: color 0.2s;
        }

        .breadcrumbs a:hover {
            color: var(--primary);
        }

        .breadcrumbs span {
            margin: 0 4px;
            color: var(--text-muted);
            opacity: 0.6;
        }

        .toolbar-actions {
            display: flex;
            gap: 12px;
        }

        .btn-secondary {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            color: var(--text-gray);
            padding: 8px 14px;
            border-radius: 6px;
            font-size: 12px;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 8px;
            box-shadow: 0px 1px 2px rgba(0,0,0,0.01);
            transition: all 0.2s;
        }

        .btn-secondary i {
            color: var(--text-muted);
            font-size: 12px;
        }

        .btn-secondary:hover {
            background: #fdfdfd;
            border-color: #d8d8e5;
            color: var(--text-dark);
        }

        /* Surface Body */
        .content {
            flex: 1;
            padding: 0px 35px 35px 35px;
            display: flex;
            flex-direction: column;
            overflow: auto;
        }

        .large-card {
            background: var(--bg-placeholder);
            border-radius: var(--radius-lg);
            width: 100%;
            min-height: calc(100vh - 120px);
            /* Matching the seamless look from image */
        }
    
/* === Global Responsive Boilerplate === */
.mobile-header { display: none; }
.mobile-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 999; backdrop-filter: blur(2px); }
.mobile-overlay.active { display: block; }

@media (max-width: 900px) {
    body { flex-direction: column; }
    
    .mobile-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        background: var(--side-bg);
        height: 60px;
        padding: 0 20px;
        flex-shrink: 0;
    }
    
    .mobile-menu-btn {
        color: var(--side-text);
        font-size: 1.1rem;
        cursor: pointer;
        padding: 6px 10px;
        border: 1px solid var(--side-border);
        border-radius: 6px;
        background: rgba(255,255,255,0.02);
    }
    
    .sidebar {
        position: fixed;
        left: -320px;
        top: 0;
        height: 100vh;
        z-index: 1000;
        transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: 4px 0 15px rgba(0,0,0,0.3);
    }
    .sidebar.active { left: 0; }
    
    .main-wrapper {
        width: 100%;
        overflow-y: auto;
    }
    
    .toolbar {
        flex-direction: column;
        align-items: flex-start;
        height: auto;
        padding: 20px;
        gap: 15px;
    }
    
    .toolbar-actions { width: 100%; justify-content: space-between; flex-wrap: wrap; }
    
    .content { padding: 0 20px 20px 20px; }
    
    .large-card { min-height: calc(100vh - 180px); }
}