:root {
            --primary: #2c7be5;
            --secondary: #1e3a8a;
            --accent: #e67e22;
            --light: #f8f9fa;
            --dark: #212529;
        }
        
        body {
            font-family: 'Kalpurush';
            margin: 0;
            padding: 0;
            color: #333;
            line-height: 1.6;
        }
        
        .container {
            width: 90%;
            max-width: 1200px;
            margin: 0 auto;
        }
        
        /* হেডার স্টাইল */
        header {
            background-color: white;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
        }
        
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        
        .logo {
            font-size: 24px;
            font-weight: 700;
            color: var(--secondary);
        }
        
        .logo span {
            color: var(--primary);
        }
        
        nav ul {
            display: flex;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        
        nav ul li {
            margin-left: 20px;
            position: relative;
        }
        
        nav ul li a {
            text-decoration: none;
            color: var(--dark);
            font-weight: 500;
            transition: color 0.3s;
            padding: 10px 15px;
            display: block;
        }
        
        nav ul li a:hover {
            color: var(--primary);
        }
        
        /* ড্রপডাউন মেনু */
        .dropdown-menu {
            position: absolute;
            top: 100%;
            left: 0;
            background-color: white;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            border-radius: 5px;
            min-width: 250px;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
            z-index: 1000;
        }
        
        nav ul li:hover .dropdown-menu {
            opacity: 1;
            visibility: visible;
        }
        
        .dropdown-menu li {
            margin: 0;
            border-bottom: 1px solid #eee;
        }
        
        .dropdown-menu li:last-child {
            border-bottom: none;
        }
        
        .dropdown-menu li a {
            padding: 12px 20px;
            color: #555;
        }
        
        .dropdown-menu li a:hover {
            background-color: #f5f5f5;
            color: var(--primary);
        }
        
        .mobile-menu {
            display: none;
            font-size: 24px;
            cursor: pointer;
        }
        
        /* ফুল পেজ স্লাইডার */
        .hero-slider {
            width: 100%;
            height: 100vh;
            position: relative;
            margin-top: 70px;
        }
        
        .hero-slider .slide {
            width: 100%;
            height: 100%;
            position: relative;
            overflow: hidden;
        }
        
        .hero-slider .slide img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        
        .slide-content {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            text-align: center;
            color: white;
            width: 90%;
            max-width: 800px;
            z-index: 2;
        }
        
        .slide-content h1 {
            font-size: 42px;
            margin-bottom: 20px;
            text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
        }
        
        .slide-content p {
            font-size: 18px;
            margin-bottom: 30px;
            text-shadow: 1px 1px 2px rgba(0,0,0,0.5);
        }
        
        .overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0,0,0,0.5);
            z-index: 1;
        }
        
        /* স্লাইডার ডট নেভিগেশন স্টাইল */
        .slick-dots {
            position: absolute;
            bottom: 30px;
            left: 50%;
            transform: translateX(-50%);
            list-style: none;
            display: flex;
            padding: 0;
            margin: 0;
            z-index: 2;
        }
        
        .slick-dots li {
            margin: 0 5px;
        }
        
        .slick-dots li button {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            border: none;
            background: rgba(255,255,255,0.5);
            text-indent: -9999px;
            padding: 0;
            cursor: pointer;
            transition: background 0.3s;
        }
        
        .slick-dots li.slick-active button {
            background: white;
            width: 30px;
            border-radius: 6px;
        }
        
        /* কোম্পানি সেকশন */
        .companies {
            padding: 80px 0;
            background-color: var(--light);
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 50px;
        }
        
        .section-title h2 {
            font-size: 32px;
            color: var(--secondary);
            position: relative;
            display: inline-block;
            padding-bottom: 15px;
        }
        
        .section-title h2:after {
            content: '';
            position: absolute;
            width: 50px;
            height: 3px;
            background-color: var(--accent);
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
        }
        
        .company-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }
        
        .company-card {
            background-color: white;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            transition: transform 0.3s;
        }
        
        .company-card:hover {
            transform: translateY(-10px);
        }
        
        .company-img {
            height: 200px;
            overflow: hidden;
        }
        
        .company-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s;
        }
        
        .company-card:hover .company-img img {
            transform: scale(1.1);
        }
        
        .company-info {
            padding: 25px;
        }
        
        .company-info h3 {
            font-size: 22px;
            margin-bottom: 15px;
            color: var(--secondary);
        }
        
        .company-info p {
            margin-bottom: 20px;
            color: #555;
        }
        
        .btn {
            display: inline-block;
            background-color: var(--primary);
            color: white;
            padding: 12px 30px;
            border-radius: 5px;
            text-decoration: none;
            font-weight: 600;
            transition: background-color 0.3s;
            border: none;
            cursor: pointer;
        }
        
        .btn:hover {
            background-color: var(--secondary);
        }
        
        /* ফুটার */
        footer {
            background-color: var(--secondary);
            color: white;
            padding: 60px 0 20px;
        }
        
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            margin-bottom: 40px;
        }
        
        .footer-col h3 {
            font-size: 20px;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 10px;
        }
        
        .footer-col h3:after {
            content: '';
            position: absolute;
            width: 40px;
            height: 2px;
            background-color: var(--accent);
            bottom: 0;
            left: 0;
        }
        
        .footer-col p, .footer-col a {
            color: #ddd;
            margin-bottom: 15px;
            display: block;
            text-decoration: none;
        }
        
        .footer-col a:hover {
            color: white;
        }
        
        .social-links {
            display: flex;
            gap: 15px;
        }
        
        .social-links a {
            display: inline-block;
            width: 40px;
            height: 40px;
            background-color: rgba(255,255,255,0.1);
            border-radius: 50%;
            text-align: center;
            line-height: 40px;
            transition: background-color 0.3s;
            color: white;
        }
        
        .social-links a:hover {
            background-color: var(--accent);
        }
        
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #aaa;
            font-size: 14px;
        }
        
        /* রেসপনসিভ স্টাইল */
        @media (max-width: 992px) {
            nav ul li {
                margin-left: 15px;
            }
            
            .slide-content h1 {
                font-size: 36px;
            }
        }
        
        @media (max-width: 768px) {
            .header-container {
                padding: 15px;
            }
            
            nav {
                position: fixed;
                top: 70px;
                left: -100%;
                width: 80%;
                height: calc(100vh - 70px);
                background-color: white;
                box-shadow: 2px 0 5px rgba(0,0,0,0.1);
                transition: left 0.3s;
                overflow-y: auto;
            }
            
            nav.active {
                left: 0;
            }
            
            nav ul {
                flex-direction: column;
                padding: 20px;
            }
            
            nav ul li {
                margin: 10px 0;
            }
            
            .dropdown-menu {
                position: static;
                opacity: 1;
                visibility: visible;
                box-shadow: none;
                border-radius: 0;
                display: none;
                padding-left: 20px;
            }
            
            nav ul li:hover .dropdown-menu {
                display: block;
            }
            
            .mobile-menu {
                display: block;
            }
            
            .hero-slider {
                margin-top: 60px;
                height: 60vh;
            }
            
            .slide-content h1 {
                font-size: 28px;
            }
            
            .slide-content p {
                font-size: 16px;
            }
            
            .slick-dots {
                bottom: 15px;
            }
        }