:root {
            --primary-color: #3498db;
            --sidebar-bg: #f8f9fa;
            --text-color: #2c3e50;
            --success-color: #2ecc71;
        }

        body {
            font-family: 'Inter', sans-serif;
            color: var(--text-color);
            line-height: 1.6;
            scroll-behavior: smooth;
        }

        /* Sidebar Design */
        .sidebar {
            height: 100vh;
            position: fixed;
            top: 0;
            left: 0;
            width: 280px;
            background: var(--sidebar-bg);
            border-right: 1px solid #e0e0e0;
            padding: 2rem 1rem;
            overflow-y: auto;
            z-index: 1000;
        }

        .logo-box {
            padding-bottom: 2rem;
            text-align: center;
            border-bottom: 1px solid #ddd;
            margin-bottom: 1.5rem;
        }

        .sidebar .nav-link {
            color: #555;
            padding: 10px 15px;
            border-radius: 6px;
            margin-bottom: 5px;
            font-weight: 500;
            transition: 0.3s;
        }

        .sidebar .nav-link:hover,
        .sidebar .nav-link.active {
            background-color: var(--primary-color);
            color: #fff !important;
        }

        /* Main Content */
        .main-content {
            margin-left: 280px;
            padding: 3rem;
            max-width: 1100px;
        }

        section {
            padding-top: 60px;
            margin-bottom: 40px;
        }

        .page-header {
            border-bottom: 2px solid var(--primary-color);
            display: inline-block;
            margin-bottom: 20px;
            padding-bottom: 5px;
            font-weight: 700;
            color: #1a2a3a;
        }

        .img-placeholder {
            width: 100%;
            min-height: 400px;
            background: #f9f9f9;
            margin: 30px 0;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-direction: column;
            border: 2px dashed #ccc;
            border-radius: 12px;
            color: #888;
        }

        .tech-badge {
            background: #e1f0fa;
            color: var(--primary-color);
            padding: 5px 15px;
            border-radius: 20px;
            font-size: 0.9rem;
            margin-right: 8px;
            display: inline-block;
            margin-bottom: 10px;
            font-weight: 600;
        }

        .step-card {
            background: #fff;
            border-left: 4px solid var(--primary-color);
            padding: 15px 20px;
            margin-bottom: 15px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
            border-radius: 0 8px 8px 0;
        }

        .important-box {
            background-color: #fff3cd;
            border-left: 5px solid #ffc107;
            padding: 15px;
            margin: 20px 0;
        }

        .code-block {
            background: #2c3e50;
            color: #ecf0f1;
            padding: 15px;
            border-radius: 8px;
            font-family: monospace;
            margin: 10px 0;
        }

        @media (max-width: 992px) {
            .sidebar {
                width: 100%;
                height: auto;
                position: relative;
            }

            .main-content {
                margin-left: 0;
                padding: 1.5rem;
            }
        }