* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --primary-color: #6c5ce7;
            --secondary-color: #a29bfe;
            --accent-color: #fd79a8;
            --bg-color: #ffffff;
            --sidebar-bg: #2d3436;
            --text-color: #2d3436;
            --text-light: #636e72;
            --border-color: #e9ecef;
            --hover-color: #74b9ff;
            --active-color: #0984e3;
            --header-height: 70px;
            --sidebar-width: 280px;
        }

        [data-theme="dark"] {
            --bg-color: #2d3436;
            --sidebar-bg: #1e2124;
            --text-color: #ffffff;
            --text-light: #b2bec3;
            --border-color: #4a5568;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: var(--bg-color);
            color: var(--text-color);
            line-height: 1.6;
            transition: all 0.3s ease;
        }

        /* Header Styles */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-height);
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 20px;
            z-index: 1000;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            transition: all 0.3s ease;
        }

        .header.scrolled {
            box-shadow: 0 4px 20px rgba(0,0,0,0.15);
            backdrop-filter: blur(10px);
        }

        .header-left {
            display: flex;
            align-items: center;
            gap: 20px;
        }

        .logo {
            font-size: 1.5rem;
            font-weight: bold;
            color: white;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .logo i {
            font-size: 1.8rem;
            color: var(--accent-color);
        }

        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
            padding: 10px;
            border-radius: 5px;
            transition: all 0.3s ease;
        }

        .hamburger:hover {
            background-color: rgba(255,255,255,0.1);
        }

        .search-container {
            flex: 1;
            max-width: 500px;
            margin: 0 20px;
            position: relative;
        }

        .search-bar {
            width: 100%;
            padding: 12px 20px 12px 50px;
            border: none;
            border-radius: 25px;
            background: rgba(255,255,255,0.2);
            color: white;
            font-size: 1rem;
            backdrop-filter: blur(10px);
            transition: all 0.3s ease;
        }

        .search-bar::placeholder {
            color: rgba(255,255,255,0.8);
        }

        .search-bar:focus {
            outline: none;
            background: rgba(255,255,255,0.3);
            box-shadow: 0 0 0 2px rgba(255,255,255,0.3);
        }

        .search-icon {
            position: absolute;
            left: 18px;
            top: 50%;
            transform: translateY(-50%);
            color: rgba(255,255,255,0.8);
            font-size: 1.1rem;
        }

        .header-right {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .theme-toggle {
            background: none;
            border: none;
            color: white;
            font-size: 1.2rem;
            cursor: pointer;
            padding: 8px;
            border-radius: 50%;
            transition: all 0.3s ease;
        }

        .theme-toggle:hover {
            background-color: rgba(255,255,255,0.1);
            transform: scale(1.1);
        }

        .mobile-search-btn {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.2rem;
            cursor: pointer;
            padding: 8px;
            border-radius: 50%;
            transition: all 0.3s ease;
        }

        .mobile-search-btn:hover {
            background-color: rgba(255,255,255,0.1);
            transform: scale(1.1);
        }

        /* Mobile Search Bar */
        .mobile-search-container {
            position: fixed;
            top: var(--header-height);
            left: 0;
            right: 0;
            background: white;
            padding: 15px 20px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            transform: translateY(-100%);
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            z-index: 999;
        }

        .mobile-search-container.active {
            transform: translateY(0);
            opacity: 1;
            visibility: visible;
        }

        .mobile-search-bar {
            width: 100%;
            padding: 12px 20px 12px 50px;
            border: 2px solid var(--border-color);
            border-radius: 25px;
            background: var(--bg-color);
            color: var(--text-color);
            font-size: 1rem;
            transition: all 0.3s ease;
        }

        .mobile-search-bar:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.1);
        }

        .mobile-search-icon {
            position: absolute;
            left: 18px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-light);
            font-size: 1.1rem;
        }

        /* Sidebar Styles */
        .sidebar {
            position: fixed;
            left: 0;
            top: var(--header-height);
            width: var(--sidebar-width);
            height: calc(100vh - var(--header-height));
            background: var(--sidebar-bg);
            overflow-y: auto;
            transform: translateX(0);
            transition: all 0.3s ease;
            z-index: 999;
        }

        .sidebar.hidden {
            transform: translateX(-100%);
        }

        .sidebar-section {
            padding: 20px 0;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }

        .sidebar-title {
            color: var(--accent-color);
            font-size: 0.9rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 1px;
            padding: 0 20px 10px;
            margin-bottom: 10px;
        }

        .sidebar-item {
            display: flex;
            align-items: center;
            gap: 15px;
            padding: 12px 20px;
            color: #b2bec3;
            text-decoration: none;
            transition: all 0.3s ease;
            position: relative;
        }

        .sidebar-item:hover {
            background-color: rgba(255,255,255,0.1);
            color: white;
            transform: translateX(5px);
        }

        .sidebar-item.active {
            background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
            color: white;
            box-shadow: 0 2px 10px rgba(108, 92, 231, 0.3);
        }

        .sidebar-item.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 4px;
            background: var(--accent-color);
        }

        .sidebar-item i {
            font-size: 1.1rem;
            width: 20px;
            text-align: center;
        }

        .social-icons {
            display: flex;
            justify-content: center;
            gap: 15px;
            padding: 20px;
        }

        .social-icon {
            color: #b2bec3;
            font-size: 1.2rem;
            transition: all 0.3s ease;
            padding: 8px;
            border-radius: 50%;
        }

        .social-icon:hover {
            color: var(--accent-color);
            transform: translateY(-2px);
        }

        .sidebar-footer {
            padding: 20px;
            text-align: center;
            border-top: 1px solid rgba(255,255,255,0.1);
        }

        .footer-links {
            display: flex;
            justify-content: center;
            gap: 15px;
            flex-wrap: wrap;
        }

        .footer-link {
            color: #b2bec3;
            text-decoration: none;
            font-size: 0.9rem;
            transition: all 0.3s ease;
        }

        .footer-link:hover {
            color: var(--accent-color);
        }

        /* Main Content */
        .main-content {
            margin-left: var(--sidebar-width);
            margin-top: var(--header-height);
            padding: 0px;
            min-height: calc(100vh - var(--header-height));
            transition: all 0.3s ease;
        }

        .main-content.expanded {
            margin-left: 0;
        }

        .welcome-section {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 40px;
            border-radius: 20px;
            text-align: center;
            margin-bottom: 40px;
            box-shadow: 0 10px 30px rgba(108, 92, 231, 0.3);
        }

        .welcome-section h1 {
            font-size: 2.5rem;
            margin-bottom: 10px;
            font-weight: 700;
        }

        .welcome-section p {
            font-size: 1.2rem;
            opacity: 0.9;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }

            .search-container {
                display: none;
            }

            .mobile-search-btn {
                display: block;
            }

            .sidebar {
                transform: translateX(-100%);
            }

            .sidebar.active {
                transform: translateX(0);
            }

            .main-content {
                margin-left: 0;
                padding: 0px;
            }

            .main-content.search-active {
                margin-top: calc(var(--header-height) + 80px);
            }

            .welcome-section {
                padding: 30px 20px;
            }

            .welcome-section h1 {
                font-size: 2rem;
            }
        }

        @media (max-width: 480px) {
            .header {
                padding: 0 15px;
            }

            .logo {
                font-size: 1.3rem;
            }

            .main-content {
                padding: 0px;
            }

            .welcome-section h1 {
                font-size: 1.8rem;
            }
        }

        /* Overlay for mobile */
        .overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0,0,0,0.5);
            z-index: 998;
        }

        .overlay.active {
            display: block;
        }

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

        .sidebar::-webkit-scrollbar-track {
            background: rgba(255,255,255,0.1);
        }

        .sidebar::-webkit-scrollbar-thumb {
            background: var(--accent-color);
            border-radius: 3px;
        }