:root { 
            --primary: #2563eb; 
            --dark: #0f172a; 
            --slate: #64748b;
            --nav-height: 80px;
            /* Global Shape Radius */
            --global-shape: 30px 10px 30px 10px;
        }

        body { 
            font-family: 'Anek Bangla', sans-serif; 
            background-color: #ffffff; 
            color: var(--dark);
            margin: 0;
            padding: 0;
        }

        /* --- Custom Shape Navbar --- */
        .navbar {
            min-height: var(--nav-height);
            background: rgba(255, 255, 255, 0.95) !important;
            backdrop-filter: blur(15px);
            border-bottom: 1px solid rgba(0, 0, 0, 0.03);
            padding: 0.6rem 0;
            transition: 0.3s;
        }

        .navbar-brand {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .navbar-brand img {
            height: clamp(35px, 5vw, 50px);
            width: auto;
            border-radius: 12px 5px; /* Tiny version of the global shape */
        }
        
        .brand-text {
            font-family: 'Montserrat', sans-serif;
            font-weight: 800;
            font-size: clamp(1.2rem, 1.8vw, 1.5rem);
            color: var(--dark);
            letter-spacing: -0.8px;
        }

        .nav-link {
            font-weight: 600;
            color: var(--dark) !important;
            font-size: 1rem;
            padding: 0.5rem 1.2rem !important;
            transition: 0.2s;
        }

        .nav-link:hover {
            color: var(--primary) !important;
        }

        /* Unique Shape Premium Button */
        .btn-premium-nav { 
            background: var(--primary); 
            color: white !important; 
            border-radius: 20px 5px 20px 5px; 
            padding: 10px 25px; 
            font-weight: 700; 
            font-size: 0.95rem;
            transition: 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            border: none;
            text-decoration: none;
        }

        .btn-premium-nav:hover { 
            border-radius: 5px 20px 5px 20px;
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(37, 99, 235, 0.2);
            color: white !important;
        }

       /* Mobile Sidebar Logic */
@media (max-width: 991.98px) {
    .navbar-collapse {
        position: fixed;
        top: 0;
        right: -100%; /* শুরুতে স্ক্রিনের বাইরে থাকবে */
        width: 280px; /* সাইডবারের প্রস্থ */
        height: 100vh;
        background: white;
        margin-top: 0 !important;
        padding: 80px 2rem 2rem !important; /* ওপরে একটু জায়গা রাখা হয়েছে ব্র্যান্ড লোগোর জন্য */
        border-radius: 0; /* সাইডবারের জন্য রেডিয়াস ০ বা একপাশে রাখা ভালো */
        box-shadow: -10px 0 40px rgba(0,0,0,0.1);
        transition: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        display: block !important;
        z-index: 1050;
    }

    /* যখন মেনু ওপেন হবে (Bootstrap 'show' class যোগ করলে) */
    .navbar-collapse.show {
        right: 0;
    }

    .nav-link { 
        border-bottom: 1px solid #f1f5f9; 
        padding: 1.2rem 0 !important; 
        font-size: 1.1rem;
    }

    .btn-premium-nav { 
        width: 100%; 
        margin-top: 2rem; 
        text-align: center; 
        display: block; 
        border-radius: var(--global-shape); /* আপনার গ্লোবাল শেপ বজায় থাকবে */
    }

    /* মেনু ওপেন থাকা অবস্থায় বডির পেছনে হালকা অন্ধকার ইফেক্ট (Optional) */
    .navbar-toggler {
        z-index: 1100; /* টগলার বাটনটি যেন সাইডবারের ওপরে থাকে */
    }
}

        /* --- Creative Footer --- */
        footer {
            background: var(--dark);
            color: #f8fafc;
            padding: 80px 0 40px;
            margin-top: auto;
            /* Curved top for footer */
            clip-path: ellipse(120% 100% at 50% 100%);
            position: relative;
        }

        .footer-logo img {
            height: 50px;
            filter: brightness(0) invert(1);
            margin-bottom: 25px;
        }

        .footer-link {
            color: #94a3b8;
            text-decoration: none;
            font-size: 0.95rem;
            display: block;
            margin-bottom: 12px;
            transition: 0.3s;
        }

        .footer-link:hover { color: #60a5fa; transform: translateX(5px); }

        .social-icon {
            width: 45px;
            height: 45px;
            background: rgba(255,255,255,0.05);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 12px 4px;
            margin-right: 10px;
            transition: 0.3s;
            color: #94a3b8;
            text-decoration: none;
        }

        .social-icon:hover {
            background: var(--primary);
            color: white;
            transform: rotate(-5deg);
        }

        .copyright {
            border-top: 1px solid rgba(255,255,255,0.05);
            margin-top: 50px;
            padding-top: 30px;
            font-size: 0.9rem;
            color: #475569;
        }

        /* Custom Alert Shape */
        .alert-custom {
            border: none;
            border-radius: 20px 5px;
            background: white;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
            border-left: 5px solid var(--primary);
        }
        .whatsapp-float {
        position: fixed;
        width: 60px;
        height: 60px;
        bottom: 30px;
        right: 30px;
        background-color: #25d366;
        color: #fff;
        border-radius: 50px;
        text-align: center;
        font-size: 32px;
        box-shadow: 0 10px 25px rgba(37, 211, 102, 0.3);
        z-index: 1000;
        display: flex;
        align-items: center;
        justify-content: center;
        text-decoration: none;
        transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    }

    .whatsapp-float:hover {
        transform: scale(1.1) rotate(5deg);
        color: #fff;
        background-color: #20ba5a;
        box-shadow: 0 15px 30px rgba(37, 211, 102, 0.4);
    }

    /* Pulse Animation */
    .whatsapp-float::before {
        content: '';
        position: absolute;
        width: 100%;
        height: 100%;
        background-color: #25d366;
        border-radius: 50px;
        z-index: -1;
        animation: pulse-green 2s infinite;
    }

    @keyframes pulse-green {
        0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.7); }
        70% { transform: scale(1); box-shadow: 0 0 0 15px rgba(37, 211, 102, 0); }
        100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(37, 211, 102, 0); }
    }

    @media screen and (max-width: 767px) {
        .whatsapp-float {
            width: 50px;
            height: 50px;
            bottom: 20px;
            right: 20px;
            font-size: 25px;
        }
    }