:root {
            --primary: #f97316;
            --primary-light: #fb923c;
            --dark-900: #0f172a;
            --dark-800: #1e293b;
            --dark-700: #334155;
            --light-100: #f8fafc;
            --light-200: #e2e8f0;
        }
        
        body {
            font-family: 'Inter', sans-serif;
            background: linear-gradient(to bottom, var(--dark-900), var(--dark-800));
            color: var(--light-100);
            scroll-behavior: smooth;
        }
        
        .gradient-text {
            background: linear-gradient(45deg, var(--primary), var(--primary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        
        .card {
            background: rgba(30, 41, 59, 0.5);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.05);
            border-radius: 16px;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            overflow: hidden;
            position: relative;
        }
        
        .card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--primary-light));
            opacity: 0;
            transition: opacity 0.3s ease;
        }
        
        .card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 25px -5px rgba(249, 115, 22, 0.15);
            border-color: rgba(249, 115, 22, 0.3);
        }
        
        .card:hover::before {
            opacity: 1;
        }
        
        .nav-link {
            position: relative;
            transition: color 0.2s ease;
        }
        
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--primary), var(--primary-light));
            transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        
        .nav-link:hover::after {
            width: 100%;
        }
        
        .btn-primary {
            background: linear-gradient(45deg, var(--primary), var(--primary-light));
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            position: relative;
            overflow: hidden;
            z-index: 1;
        }
        
        .btn-primary::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(45deg, var(--primary-light), var(--primary));
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            z-index: -1;
        }
        
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 15px -3px rgba(249, 115, 22, 0.4);
        }
        
        .btn-primary:hover::before {
            left: 0;
        }
        
        .feature-icon {
            background: rgba(249, 115, 22, 0.1);
            width: 56px;
            height: 56px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 16px;
            margin-bottom: 16px;
            transition: all 0.3s ease;
        }
        
        .feature-icon i {
            transition: transform 0.3s ease;
        }
        
        .card:hover .feature-icon {
            background: rgba(249, 115, 22, 0.2);
        }
        
        .card:hover .feature-icon i {
            transform: scale(1.1);
        }
        
        .tariff-selector {
            transition: all 0.3s ease;
            border: 2px solid var(--dark-700);
        }
        
        .tariff-selector.active {
            background: rgba(249, 115, 22, 0.1);
            border-color: var(--primary);
            box-shadow: 0 0 0 1px var(--primary);
        }
        
        .tariff-selector:hover {
            border-color: rgba(249, 115, 22, 0.5);
        }
        
        .progress-bar {
            height: 6px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 3px;
            overflow: hidden;
        }
        
        .progress-fill {
            height: 100%;
            background: linear-gradient(90deg, var(--primary), var(--primary-light));
            border-radius: 3px;
            transition: width 0.5s ease;
        }
        
        @keyframes float {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-10px); }
        }
        
        .floating {
            animation: float 6s ease-in-out infinite;
        }
        
        @keyframes pulse {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.5; }
        }
        
        .pulse {
            animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
        }
        
        /* Hero section glow */
        .hero-glow {
            position: absolute;
            width: 100%;
            height: 100%;
            top: 0;
            left: 0;
            background: radial-gradient(circle at center, rgba(249, 115, 22, 0.15) 0%, transparent 70%);
            z-index: 0;
        }
        
        /* Modern scrollbar */
        ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }
        
        ::-webkit-scrollbar-track {
            background: var(--dark-800);
        }
        
        ::-webkit-scrollbar-thumb {
            background: var(--primary);
            border-radius: 4px;
        }
        
        ::-webkit-scrollbar-thumb:hover {
            background: var(--primary-light);
        }
        
        /* Mobile menu */
        .mobile-menu {
            transform: translateX(100%);
            transition: transform 0.3s ease;
        }
        
        .mobile-menu.open {
            transform: translateX(0);
        }
        
        /* Tooltip */
        .tooltip {
            position: relative;
        }
        
        .tooltip-text {
            visibility: hidden;
            width: 200px;
            background-color: var(--dark-700);
            color: #fff;
            text-align: center;
            border-radius: 6px;
            padding: 8px;
            position: absolute;
            z-index: 1;
            bottom: 125%;
            left: 50%;
            transform: translateX(-50%);
            opacity: 0;
            transition: opacity 0.3s;
            font-size: 14px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }
        
        .tooltip:hover .tooltip-text {
            visibility: visible;
            opacity: 1;
        }
        
        /* Floating action button */
        .fab {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: linear-gradient(45deg, var(--primary), var(--primary-light));
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            box-shadow: 0 4px 20px rgba(249, 115, 22, 0.3);
            z-index: 50;
            transition: all 0.3s ease;
        }
        
        .fab:hover {
            transform: translateY(-3px) scale(1.05);
            box-shadow: 0 8px 25px rgba(249, 115, 22, 0.4);
        }
        
        /* Loading spinner */
        .spinner {
            width: 24px;
            height: 24px;
            border: 3px solid rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            border-top-color: var(--primary);
            animation: spin 1s ease-in-out infinite;
        }
        
        @keyframes spin {
            to { transform: rotate(360deg); }
        }
        
        /* Language dropdown */
        .language-dropdown {
            display: none;
            position: absolute;
            right: 0;
            top: 100%;
            background-color: var(--dark-800);
            min-width: 120px;
            box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
            z-index: 1;
            border-radius: 8px;
            overflow: hidden;
            border: 1px solid var(--dark-700);
        }
        
        .language-dropdown a {
            color: var(--light-200);
            padding: 8px 12px;
            text-decoration: none;
            display: block;
            transition: background-color 0.2s;
        }
        
        .language-dropdown a:hover {
            background-color: var(--dark-700);
        }
        
        .show-dropdown {
            display: block;
        }
        
        /* Responsive adjustments */
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
                line-height: 1.2;
            }
            
            .card {
                border-radius: 12px;
            }
            
            .language-dropdown {
                right: auto;
                left: 0;
            }
        }