@import url('https://fonts.googleapis.com/css2?family=Hind+Siliguri:wght@400;600;700&family=Inter:wght@300;400;600;700&display=swap');

:root {
    --primary-gradient: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
    --accent-color: #0072ff;
    --accent-gradient: linear-gradient(135deg, #00c6ff, #0072ff);
    --secondary-color: #ff6a00;
    --secondary-gradient: linear-gradient(135deg, #ffb300, #ff6a00);
    --dark-blue: #0a192f;
    --light-bg: #f4f7f6;
    --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

body {
    font-family: 'Inter', 'Hind Siliguri', sans-serif;
    color: #333;
    background-color: #ffffff;
    overflow-x: hidden;
}

.container { width: 88%; max-width: 1200px; margin: 0 auto; }

/* টপ বার */
.top-bar { background-color: var(--dark-blue); color: #a8b2d1; font-size: 0.85rem; padding: 8px 0; border-bottom: 1px solid rgba(255,255,255,0.05); }
.top-bar-content { display: flex; justify-content: space-between; align-items: center; }
.top-links a { color: #fff; text-decoration: none; margin-left: 20px; background: rgba(255,255,255,0.1); padding: 3px 10px; border-radius: 4px; transition: var(--transition); }
.top-links a:hover { background: var(--accent-color); }

/* নেভিগেশন বার */
header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 2000; /* মেনু যেন সবার উপরে থাকে */
    box-shadow: 0 2px 20px rgba(0,0,0,0.05);
}
.navbar { display: flex; justify-content: space-between; align-items: center; padding: 18px 0; }
.logo-img { height: 55px; width: auto; display: block; object-fit: contain; }

.nav-links { display: flex; list-style: none; gap: 30px; }
.nav-links a { text-decoration: none; color: #44566c; font-weight: 600; font-size: 0.95rem; transition: var(--transition); position: relative; padding: 5px 0; }
.nav-links a:hover, .nav-links a.active { color: var(--accent-color); }
.nav-links a::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px; background: var(--accent-gradient); transition: var(--transition); }
.nav-links a:hover::after { width: 100%; }

/* বাটনস */
.btn { padding: 10px 24px; border-radius: 30px; font-weight: 600; text-decoration: none; display: inline-flex; align-items: center; gap: 8px; transition: var(--transition); cursor: pointer; }
.btn-primary { background: var(--accent-gradient); color: #fff; box-shadow: 0 4px 15px rgba(0, 114, 255, 0.3); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0, 114, 255, 0.4); }
.btn-secondary { background: var(--secondary-gradient); color: #fff; box-shadow: 0 4px 15px rgba(255, 106, 0, 0.3); }
.btn-secondary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(255, 106, 0, 0.4); }
.btn-outline { border: 2px solid var(--accent-color); color: var(--accent-color); background: transparent; }
.btn-outline:hover { background: var(--accent-gradient); color: #fff; }
.btn-full { width: 100%; justify-content: center; }

/* প্রিমিয়াম হিরো সেকশন */
.hero { background: #f9fbfd; padding: 100px 0 120px 0; position: relative; }
.hero-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(450px, 1fr)); align-items: center; gap: 50px; }
.badge-tech { background: rgba(0, 114, 255, 0.1); color: var(--accent-color); padding: 6px 16px; border-radius: 20px; font-size: 0.85rem; font-weight: 700; display: inline-block; margin-bottom: 20px; }
.hero-text h1 { font-size: 3.5rem; color: var(--dark-blue); line-height: 1.2; margin-bottom: 20px; }
.hero-text h1 span { background: var(--accent-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero-text p { font-size: 1.1rem; color: #616e7c; margin-bottom: 35px; }
.hero-btns { display: flex; gap: 15px; }
.hero-image { position: relative; }
.hero-image img { width: 100%; border-radius: 20px; box-shadow: 0 20px 40px rgba(0,0,0,0.15); z-index: 2; position: relative; }
.glow-bg { position: absolute; top: -10%; right: -10%; width: 80%; height: 80%; background: radial-gradient(circle, rgba(0,114,255,0.2) 0%, transparent 70%); z-index: 1; }

/* মুভিং লোগো স্লাইডার */
.happy-customers { background: #fff; padding: 60px 0; overflow: hidden; }
.small-header h2 { font-size: 1.8rem; color: var(--dark-blue); text-align: center; margin-bottom: 35px; font-weight: 700; position: relative; }
.logo-slider { width: 100%; overflow: hidden; padding: 10px 0; }
.logo-track { display: flex; width: calc(250px * 10); animation: scroll 25s linear infinite; gap: 60px; }
.slide { width: 180px; display: flex; align-items: center; justify-content: center; }
.slide img { width: 100%; height: auto; max-height: 55px; object-fit: contain; opacity: 0.6; transition: 0.3s; }
.slide img:hover { opacity: 1; }
@keyframes scroll { 0% { transform: translateX(0); } 100% { transform: translateX(calc(-250px * 5)); } }

/* ফিচার্স বার */
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 30px; margin-top: -60px; position: relative; z-index: 5; }
.feature-box { background: #fff; padding: 25px; border-radius: 12px; box-shadow: var(--card-shadow); display: flex; align-items: center; gap: 20px; border-bottom: 3px solid transparent; transition: var(--transition); }
.feature-box:hover { transform: translateY(-5px); border-color: var(--accent-color); }
.feature-box i { font-size: 2.5rem; color: var(--accent-color); }
.feature-box h3 { font-size: 1.1rem; color: var(--dark-blue); margin-bottom: 5px; }
.feature-box p { font-size: 0.9rem; color: #666; }

/* সেকশন হেডার */
.section-header { text-align: center; max-width: 600px; margin: 0 auto 50px auto; }
.section-header h2 { font-size: 2.2rem; color: var(--dark-blue); margin-bottom: 15px; }
.section-header p { color: #666; }

/* সেবাসমূহ সেকশন */
.services { background: var(--light-bg); padding: 100px 0; margin-top: 50px; }
.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 30px; }
.service-card { background: #fff; padding: 40px 30px; border-radius: 16px; box-shadow: var(--card-shadow); transition: var(--transition); }
.service-card:hover { transform: translateY(-10px); box-shadow: 0 15px 35px rgba(0,0,0,0.12); }
.icon-wrapper { width: 70px; height: 70px; background: rgba(0, 114, 255, 0.08); color: var(--accent-color); border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 2rem; margin-bottom: 25px; transition: var(--transition); }
.service-card:hover .icon-wrapper { background: var(--accent-gradient); color: #fff; }
.service-card h3 { margin-bottom: 15px; color: var(--dark-blue); }

/* প্যাকেজ বা প্রাইসিং সেকশন */
.packages { padding: 100px 0; }
.package-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; align-items: center; margin-bottom: 40px; }
.package-card { background: #fff; border: 1px solid #e1e8ed; padding: 40px 30px; border-radius: 16px; text-align: center; transition: var(--transition); position: relative; }
.package-card:hover { box-shadow: 0 20px 40px rgba(0,0,0,0.08); border-color: transparent; }
.package-card.popular { border: 2px solid var(--secondary-color); box-shadow: 0 15px 35px rgba(255, 106, 0, 0.15); }
.popular-tag { position: absolute; top: -15px; left: 50%; transform: translateX(-50%); background: var(--secondary-gradient); color: #fff; padding: 4px 15px; font-size: 0.8rem; font-weight: 700; border-radius: 20px; }
.package-card h3 { font-size: 1.3rem; color: var(--dark-blue); margin-bottom: 15px; }
.speed { font-size: 3rem; font-weight: 700; color: var(--accent-color); line-height: 1; }
.speed span { font-size: 1.2rem; font-weight: 600; }
.price { font-size: 1.4rem; font-weight: 600; margin: 15px 0 25px 0; color: #444; }
.price span { font-size: 0.9rem; color: #777; }
.package-card hr { border: 0; height: 1px; background: #e1e8ed; margin-bottom: 25px; }
.package-card ul { list-style: none; text-align: left; margin-bottom: 35px; }
.package-card ul li { margin-bottom: 12px; font-size: 0.95rem; display: flex; align-items: center; gap: 10px; }
.package-card ul i { color: #2ed573; }

.category-title { font-size: 1.6rem; color: var(--dark-blue); margin-bottom: 25px; padding-bottom: 10px; border-bottom: 2px solid #e1e8ed; display: flex; align-items: center; gap: 10px; }
.category-title i { color: var(--accent-color); }
.package-card.premium-corp { border: 2px solid var(--accent-color); box-shadow: 0 15px 35px rgba(0, 114, 255, 0.15); }

/* কন্টাক্ট সেকশন */
.contact { background: var(--primary-gradient); color: #fff; padding: 100px 0; }
.contact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(400px, 1fr)); gap: 50px; }
.contact-info h2 { font-size: 2.5rem; margin-bottom: 20px; }
.info-item { display: flex; align-items: flex-start; gap: 20px; margin-top: 30px; }
.info-item i { font-size: 1.8rem; color: var(--secondary-color); background: rgba(255,255,255,0.05); padding: 15px; border-radius: 12px; }
.info-item h4 { font-size: 1.1rem; margin-bottom: 5px; }
.info-item p { color: #ccc; }
.contact-card { background: #fff; color: #333; padding: 40px; border-radius: 16px; box-shadow: 0 15px 35px rgba(0,0,0,0.2); }
.contact-card h3 { margin-bottom: 25px; color: var(--dark-blue); font-size: 1.4rem; }
.form-group { margin-bottom: 20px; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 14px; border: 1px solid #ddd; border-radius: 8px; background: #f8fafc; font-family: inherit; font-size: 0.95rem; transition: var(--transition); }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--accent-color); background: #fff; box-shadow: 0 0 0 4px rgba(0, 114, 255, 0.1); }

/* ফুটার সেকশন (সম্পূর্ণ ফিক্সড) */
footer { background: #07111e; color: #a8b2d1; padding: 70px 0 30px 0; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 40px; border-bottom: 1px solid rgba(255,255,255,0.05); padding-bottom: 40px; text-align: left; }
.footer-about h3 { color: #fff; font-size: 1.5rem; margin-bottom: 15px; }
.footer-about h3 span { color: var(--accent-color); }
.footer-links h4, .footer-social h4 { color: #fff; margin-bottom: 20px; }
.footer-links ul { list-style: none; }
.footer-links ul li { margin-bottom: 12px; }
.footer-links ul a { color: #a8b2d1; text-decoration: none; transition: var(--transition); }
.footer-links ul a:hover { color: var(--accent-color); padding-left: 5px; }
.social-icons { display: flex; gap: 15px; }
.social-icons a { width: 45px; height: 45px; background: rgba(255,255,255,0.05); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; text-decoration: none; transition: var(--transition); }
.social-icons a:hover { background: var(--accent-gradient); transform: translateY(-3px); }
.footer-bottom { text-align: center; padding-top: 30px; font-size: 0.9rem; border-top: 1px solid rgba(255,255,255,0.02); }

/* রেসপন্সিভ মিডিয়া কোয়েরি ও মোবাইল অপ্টিমাইজেশন */
.menu-toggle { display: none; background: none; border: none; font-size: 1.6rem; color: var(--dark-blue); cursor: pointer; }
.mobile-only-btn { display: none; }

@media (max-width: 992px) {
    .hero-text h1 { font-size: 2.8rem; }
    .hero-grid { grid-template-columns: 1fr; text-align: center; gap: 40px; }
    .hero-btns { justify-content: center; }
}

@media (max-width: 768px) {
    .top-bar-content { flex-direction: column; gap: 10px; text-align: center; font-size: 0.8rem; }
    .top-links a { margin: 0 10px; }
    .menu-toggle { display: block; }
    
    /* প্রিমিয়াম ব্লার ইফেক্টযুক্ত ড্রপডাউন মোবাইল মেনু */
    nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: rgba(255, 255, 255, 0.98);
        box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        padding: 25px 0;
    }
    nav.active { display: block; }
    .nav-links { flex-direction: column; gap: 20px; width: 88%; margin: 0 auto; text-align: center; }
    .nav-links a { display: block; padding: 10px 0; font-size: 1rem; }
    .nav-links a::after { display: none; }
    
    .mobile-only-btn { display: block; width: 100%; margin-top: 10px; }
    .mobile-only-btn .btn { width: 100%; justify-content: center; }
    .desktop-only { display: none; }
    
    .hero { padding: 60px 0; }
    .hero-text h1 { font-size: 2.4rem; }
    .features { margin-top: 30px; }
    .contact-grid { grid-template-columns: 1fr; gap: 40px; }
    .footer-grid { grid-template-columns: 1fr; text-align: center; gap: 30px; }
    .social-icons { justify-content: center; }
}