:root {
            --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
            --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
            --success-gradient: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
            --warning-gradient: linear-gradient(135deg, #ff9a9e 0%, #fecfef 100%);
            
            --white-bg: #ffffff;
            --light-bg: #f8fafc;
            --card-bg: #ffffff;
            --border-light: rgba(0, 0, 0, 0.08);
            --border-medium: rgba(0, 0, 0, 0.12);
            --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.04);
            --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.08);
            --shadow-heavy: 0 8px 32px rgba(0, 0, 0, 0.12);
            
            --text-primary: #1a1a1a;
            --text-secondary: #6b7280;
            --text-muted: #9ca3af;
            --accent-blue: #337ab7;
        }

        body {
            background: var(--light-bg);
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
            color: var(--text-primary);
            line-height: 1.6;
            padding: 40px 20px;
        }

        /* Modern Sidebar Container */
        .modern-sidebar {
            background: var(--card-bg);
            border-radius: 24px;
            overflow: hidden;
            box-shadow: var(--shadow-medium);
            border: 1px solid var(--border-light);
            position: relative;
            height: fit-content;
        }

        .modern-sidebar::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: 
                radial-gradient(circle at 20% 20%, rgba(102, 126, 234, 0.02) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(240, 147, 251, 0.02) 0%, transparent 50%);
            pointer-events: none;
            z-index: 1;
        }

        .sidebar-content {
            position: relative;
            z-index: 2;
        }

        /* Navigation Section */
        .nav-section {
            padding: 35px 30px;
            border-bottom: 1px solid var(--border-light);
        }

        .section-title {
            font-size: 1.4rem;
            font-weight: 700;
            text-align: center;
            margin-bottom: 30px;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            position: relative;
        }

        .section-title::after {
            content: '';
            position: absolute;
            bottom: -25px;
            left: 50%;
            transform: translateX(-50%);
            width: 50px;
            height: 3px;
            background: var(--primary-gradient);
            border-radius: 2px;
        }

        .nav-menu {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .nav-item {
            margin-bottom: 8px;
        }

        .nav-l {
            display: flex;
            align-items: center;
            gap: 15px;
            padding: 16px 20px;
            color: var(--text-secondary);
            text-decoration: none;
            border-radius: 16px;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            font-weight: 500;
            font-size: 1rem;
            position: relative;
            overflow: hidden;
        }

        .nav-l::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            height: 100%;
            width: 4px;
            background: var(--primary-gradient);
            transform: scaleY(0);
            transition: transform 0.3s ease;
            border-radius: 0 2px 2px 0;
        }

        .nav-l::after {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.1), transparent);
            transition: left 0.5s;
        }

        .nav-l:hover {
            color: var(--text-primary);
            background: rgba(102, 126, 234, 0.08);
            transform: translateX(8px);
            text-decoration: none;
        }

        .nav-l:hover::before {
            transform: scaleY(1);
        }

        .nav-l:hover::after {
            left: 100%;
        }

        .nav-icon {
            width: 20px;
            height: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(102, 126, 234, 0.1);
            border-radius: 8px;
            color: var(--accent-blue);
            font-size: 0.9rem;
            transition: all 0.3s ease;
        }

        .nav-l:hover .nav-icon {
            background: var(--primary-gradient);
            color: white;
            transform: scale(1.1);
        }

        /* Promo Banner Section */
        .promo-section {
            padding: 30px;
            border-bottom: 1px solid var(--border-light);
        }

        .promo-banner {
            background: var(--accent-gradient);
            border-radius: 20px;
            padding: 25px 20px;
            text-align: center;
            color: white;
            position: relative;
            overflow: hidden;
            transition: all 0.3s ease;
            cursor: pointer;
        }

        .promo-banner::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="dots" width="20" height="20" patternUnits="userSpaceOnUse"><circle cx="10" cy="10" r="1.5" fill="rgba(255,255,255,0.2)"/></pattern></defs><rect width="100" height="100" fill="url(%23dots)"/></svg>');
            opacity: 0.3;
        }

        .promo-banner:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-heavy);
        }

        .promo-content {
            position: relative;
            z-index: 2;
        }

        .promo-image {
            width: 100%;
            height: 150px;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 15px;
            font-size: 3rem;
            backdrop-filter: blur(10px);
        }

        .promo-text {
            font-size: 0.9rem;
            opacity: 0.9;
            margin: 0;
        }

        /* Contact Section */
        .contact-section {
            padding: 35px 30px;
        }

        .contact-title {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--accent-blue);
            margin-bottom: 25px;
            text-align: center;
            position: relative;
        }

        .contact-title::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 50%;
            transform: translateX(-50%);
            width: 40px;
            height: 2px;
            background: var(--accent-blue);
            border-radius: 1px;
        }

        .contact-info {
            margin-bottom: 30px;
        }

        .contact-item {
            display: flex;
            align-items: center;
            gap: 15px;
            padding: 12px 16px;
            margin-bottom: 10px;
            color: var(--text-secondary);
            text-decoration: none;
            border-radius: 12px;
            transition: all 0.3s ease;
            font-weight: 500;
        }

        .contact-item:hover {
            color: var(--text-primary);
            background: rgba(102, 126, 234, 0.05);
            text-decoration: none;
            transform: translateX(5px);
        }

        .contact-icon {
            width: 40px;
            height: 40px;
            border-radius: 12px;
            background: var(--primary-gradient);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1rem;
            transition: all 0.3s ease;
            flex-shrink: 0;
        }

        .contact-item:hover .contact-icon {
            transform: scale(1.1);
            box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
        }

        /* CTA Button */
        .cta-button {
            width: 100%;
            padding: 16px 24px;
            background: var(--secondary-gradient);
            color: white;
            border: none;
            border-radius: 16px;
            font-weight: 700;
            font-size: 1.1rem;
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            position: relative;
            overflow: hidden;
            box-shadow: 0 8px 25px rgba(240, 147, 251, 0.3);
        }

        .cta-button::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
            transition: left 0.6s;
        }

        .cta-button:hover {
            transform: translateY(-3px);
            box-shadow: 0 15px 40px rgba(240, 147, 251, 0.4);
        }

        .cta-button:hover::before {
            left: 100%;
        }

        .cta-icon {
            margin-right: 8px;
            font-size: 1rem;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .modern-sidebar {
                margin-bottom: 30px;
            }

            .nav-section,
            .contact-section {
                padding: 25px 20px;
            }

            .promo-section {
                padding: 20px;
            }

            .section-title,
            .contact-title {
                font-size: 1.2rem;
            }

            .nav-l {
                padding: 14px 16px;
                font-size: 0.95rem;
            }
        }

        

        /* Floating Animation */
        .floating {
            animation: float 4s ease-in-out infinite;
        }

        @keyframes float {
            0%, 100% { transform: translateY(0px); }
            50% { transform: translateY(-8px); }
        }

        /* Pulse Animation for CTA */
        .pulse {
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0% { box-shadow: 0 8px 25px rgba(240, 147, 251, 0.3); }
            50% { box-shadow: 0 8px 25px rgba(240, 147, 251, 0.6); }
            100% { box-shadow: 0 8px 25px rgba(240, 147, 251, 0.3); }
        }