:root {
            --primary: #6366f1;
            --primary-dark: #4f46e5;
            --secondary: #a855f7;
            --dark: #0f172a;
            --darker: #020617;
            --light: #f8fafc;
            --gray: #94a3b8;
            --glass: rgba(255, 255, 255, 0.03);
            --glass-border: rgba(255, 255, 255, 0.1);
            --gradient: linear-gradient(135deg, var(--primary), var(--secondary));
        }

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

        body {
            font-family: 'Inter', sans-serif;
            background-color: var(--darker);
            color: var(--light);
            line-height: 1.6;
            overflow-x: hidden;
        }

        h1, h2, h3, .logo { font-family: 'Poppins', sans-serif; }

        /* Preloader */
        #preloader {
            position: fixed; top:0; left:0; width:100%; height:100%;
            background: var(--darker); z-index: 9999;
            display: flex; justify-content: center; align-items: center;
        }
        .loader {
            width: 50px; height: 50px; border: 5px solid var(--glass);
            border-top-color: var(--primary); border-radius: 50%;
            animation: spin 1s linear infinite;
        }
        @keyframes spin { to { transform: rotate(360deg); } }

        /* Utility Classes */
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        .section-padding { padding: 100px 0; }
        .btn {
            padding: 14px 28px; border-radius: 50px; border: none;
            cursor: pointer; font-weight: 600; transition: 0.3s;
            text-decoration: none; display: inline-block;
        }
        .btn-primary { background: var(--gradient); color: white; box-shadow: 0 10px 20px rgba(99, 102, 241, 0.3); }
        .btn-primary:hover { transform: translateY(-3px); box-shadow: 0 15px 25px rgba(99, 102, 241, 0.4); }
        .btn-outline { border: 1px solid var(--glass-border); color: white; background: var(--glass); }
        .btn-outline:hover { background: white; color: var(--dark); }

        /* Navbar */
        nav {
            padding: 20px 0; transition: 0.4s;
        }
        nav.sticky { background: rgba(2, 6, 23, 0.9); backdrop-filter: blur(10px); padding: 15px 0; border-bottom: 1px solid var(--glass-border); }
        .navbar-brand { font-size: 1.5rem; font-weight: 700; color: white !important; text-decoration: none; }
        .navbar-brand span { color: var(--primary); }
        .navbar-nav .nav-link { color: var(--gray); text-decoration: none; font-size: 0.9rem; transition: 0.3s; padding: 0.5rem 1rem; }
        .navbar-nav .nav-link:hover { color: var(--primary) !important; }
        .navbar-toggler { border: none; color: white; font-size: 1.5rem; background: none; }
        .navbar-toggler:focus { box-shadow: none; }

        /* Hero Section */
        .hero { 
            height: 100vh; display: flex; align-items: center; 
            background: radial-gradient(circle at top right, rgba(99, 102, 241, 0.15), transparent);
            position: relative; overflow: hidden;
        }
        .hero-content { max-width: 700px; z-index: 2; }
        .hero h1 { font-size: 4rem; line-height: 1.1; margin-bottom: 25px; }
        .hero p { font-size: 1.2rem; color: var(--gray); margin-bottom: 35px; }
        .hero-btns { display: flex; gap: 15px; }
        
        .hero-stats {
            display: flex; gap: 50px; margin-top: 60px;
        }
        .stat-item h3 { font-size: 2.5rem; color: white; }
        .stat-item p { margin-bottom: 0; font-size: 0.9rem; }

        /* Services Grid */
        .section-title h2 { font-size: 2.5rem; margin-bottom: 15px; }
        
        .service-card {
            background: var(--glass); border: 1px solid var(--glass-border);
            padding: 40px; border-radius: 20px; transition: 0.4s;
        }
        .service-card:hover { 
            border-color: var(--primary); transform: translateY(-10px);
            background: rgba(255,255,255,0.05);
        }
        .service-card i { font-size: 2.5rem; margin-bottom: 20px; color: var(--primary); }

        /* Process Steps */
        .process-container { display: flex; justify-content: space-between; position: relative; margin-top: 50px; }
        .process-item { text-align: center; flex: 1; z-index: 1; }
        .step-num { 
            width: 60px; height: 60px; background: var(--glass); border: 2px solid var(--primary);
            border-radius: 50%; display: flex; align-items: center; justify-content: center;
            margin: 0 auto 20px; font-weight: bold; font-size: 1.2rem;
        }

        /* Portfolio */
        .filter-btns { display: flex; justify-content: center; gap: 15px; margin-bottom: 40px; }
        .filter-btn { 
            background: none; border: 1px solid var(--glass-border); color: white;
            padding: 8px 20px; border-radius: 20px; cursor: pointer;
        }
        .filter-btn.active { background: var(--primary); border-color: var(--primary); }
        
        /* .portfolio-grid { Grid handled by Bootstrap } */
        .portfolio-item { 
            position: relative; border-radius: 15px; overflow: hidden; height: 250px; margin-bottom: 0;
        }
        .portfolio-item img { width: 100%; height: 100%; object-fit: cover; transition: 0.5s; }
        .portfolio-overlay {
            position: absolute; inset: 0; background: rgba(99, 102, 241, 0.9);
            display: flex; flex-direction: column; align-items: center; justify-content: center;
            opacity: 0; transition: 0.4s;
        }
        .portfolio-item:hover .portfolio-overlay { opacity: 1; }
        .portfolio-item:hover img { transform: scale(1.1); }

        /* Pricing */
        .pricing-card {
            background: var(--glass); padding: 40px; border-radius: 24px;
            border: 1px solid var(--glass-border); text-align: center; position: relative;
        }
        .pricing-card.featured { border: 2px solid var(--primary); transform: scale(1.05); }
        .price { font-size: 3rem; font-weight: 700; margin: 20px 0; }
        .price span { font-size: 1rem; color: var(--gray); }
        .features-list { list-style: none; margin: 30px 0; color: var(--gray); text-align: left; }
        .features-list li { margin-bottom: 12px; }
        .features-list i { color: var(--primary); margin-right: 10px; }

        /* Accordion */
        .faq-item { background: var(--glass); margin-bottom: 15px; border-radius: 10px; overflow: hidden; }
        .faq-question { padding: 20px; cursor: pointer; display: flex; justify-content: space-between; font-weight: 600; }
        .faq-answer { padding: 0 20px; max-height: 0; overflow: hidden; transition: 0.3s ease-out; color: var(--gray); }

         /* Contact Form */
        .contact-form input, .contact-form select, .contact-form textarea {
            width: 100%; padding: 15px; background: var(--glass); border: 1px solid var(--glass-border);
            border-radius: 10px; color: white; margin-bottom: 20px; outline: none;
        }

        /* Option elements hover & list styling */
        .contact-form select option {
            background-color: #0b0f19; /* এখানে আপনার মূল সাইটের ব্যাকগ্রাউন্ড কালার ব্যবহার করুন */
            color: white;
        }

.contact-form input:focus { border-color: var(--primary); }

        /* Footer */
        .social-links { display: flex; gap: 15px; margin-top: 20px; }
        .social-links a { 
            width: 40px; height: 40px; background: var(--glass); border-radius: 50%;
            display: flex; align-items: center; justify-content: center; color: white; text-decoration: none;
        }

        /* Float Buttons */
        .whatsapp-float {
            position: fixed; bottom: 30px; right: 30px; background: #25d366;
            width: 60px; height: 60px; border-radius: 50%; display: flex;
            align-items: center; justify-content: center; font-size: 30px;
            color: white; z-index: 100; box-shadow: 0 5px 15px rgba(0,0,0,0.3);
        }

        /* Responsive */
        body { padding-top: 80px; }
        nav { top: 0; left: 0; width: 100%; }
        .hero { min-height: calc(100vh - 80px); }
        .hero-content { padding-top: 30px; }

        @media (max-width: 768px) {
            body { padding-top: 70px; }
            .hero h1 { font-size: 2.5rem; }
            .hero p { font-size: 1rem; }
            .hero-btns { flex-direction: column; align-items: stretch; }
            .hero-btns .btn { width: 100%; text-align: center; }
            .hero-stats { flex-direction: column; gap: 30px; }
            .hero-content { padding-top: 20px; }
            .section-title{ text-align: center; }
            .process-container { flex-direction: column; gap: 30px; }
        }