/* --- Variables & Reset --- */
:root {
    --primary-blue: #3b82f6;
    --dark-bg: #0f172a;
    --footer-bg: #1e293b;
    --white: #ffffff;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --popup-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

* {
    margin: 0; padding: 0; box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    scroll-behavior: smooth;
}

body { background-color: #f8fafc; overflow-x: hidden; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* --- Header & Navigation --- */
header {
    background-color: var(--dark-bg);
    padding: 15px 0;
    position: sticky; top: 0; z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.nav-container { display: flex; justify-content: space-between; align-items: center; }
.logo { color: var(--white); font-size: 1.5rem; font-weight: bold; text-decoration: none; }

.nav-links { display: flex; list-style: none; align-items: center; }
.nav-links li { margin-left: 15px; }

/* টপ মেনু বাটন অ্যানিমেশন (Home, Service, Contact) */
.nav-links a {
    color: var(--white); 
    text-decoration: none; 
    font-weight: 500;
    transition: var(--transition);
    display: inline-block;
    padding: 8px 18px; /* বাটনের মতো প্যাডিং */
    border-radius: 50px; /* রাউন্ডেড বাটন */
}

.nav-links a:hover {
    color: var(--white) !important; /* টেক্সট সাদা থাকবে */
    background-color: var(--primary-blue); /* মাউস নিলে ব্যাকগ্রাউন্ড নীল হবে */
    transform: translateY(-3px) scale(1.05); /* পপআপ অ্যানিমেশন */
    box-shadow: 0 5px 15px rgba(59,130,246,0.4);
}

.menu-icon, .close-icon { display: none; color: var(--white); cursor: pointer; }

/* --- Hero Section --- */
.hero {
    height: 85vh;
    background: linear-gradient(rgba(15,23,42,0.85), rgba(15,23,42,0.85)), url('https://images.unsplash.com/photo-1531297484001-80022131f5a1?auto=format&fit=crop&w=1350&q=80');
    background-size: cover; background-position: center;
    display: flex; align-items: center; justify-content: center; text-align: center; color: var(--white);
}

.hero-content { margin-top: -60px; }
.hero h1 { font-size: 3.5rem; margin-bottom: 15px; font-weight: 800; }
.hero-desc { font-size: 1.2rem; margin-bottom: 30px; max-width: 700px; margin-left: auto; margin-right: auto; opacity: 0.95; }

.btn {
    display: inline-block; padding: 14px 35px; border-radius: 50px;
    text-decoration: none; font-weight: bold;
    transition: var(--transition);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    background: var(--primary-blue); color: white;
}

.btn:hover {
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 15px 30px rgba(59,130,246,0.4);
}

/* --- Services --- */
.services-section { padding: 80px 0; text-align: center; }
.section-title { font-size: 2.2rem; margin-bottom: 50px; position: relative; display: inline-block; }
.section-title::after { content: ''; width: 50%; height: 3px; background: var(--primary-blue); position: absolute; bottom: -10px; left: 25%; }

.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 30px; }
.service-card {
    background: white; padding: 40px; border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    transition: var(--transition);
    border: 1px solid #eee;
}
.service-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: var(--popup-shadow);
    border-color: var(--primary-blue);
}
.icon-box { font-size: 2.5rem; color: var(--primary-blue); margin-bottom: 15px; }

/* --- Contact Section --- */
.contact-section { padding: 80px 0; background: #e2e8f0; text-align: center; }
.contact-wrapper { display: flex; justify-content: center; flex-wrap: wrap; gap: 20px; }
.contact-card { padding: 25px; border-radius: 12px; width: 320px; color: white; transition: var(--transition); }
.whatsapp-card { background: linear-gradient(135deg, #25D366, #128C7E); }
.email-card { background: linear-gradient(135deg, #ef4444, #b91c1c); }

.contact-card:hover { transform: translateY(-5px); box-shadow: var(--popup-shadow); }

.copy-box { background: rgba(255,255,255,0.25); padding: 8px 12px; border-radius: 8px; display: flex; justify-content: space-between; align-items: center; margin-top: 15px; }
.copy-btn {
    background: white; color: var(--dark-bg); border: none;
    padding: 8px 12px; border-radius: 6px; cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}
.copy-btn:hover {
    transform: translateY(-3px) scale(1.1);
    background-color: var(--primary-blue);
    color: white;
}

/* --- Footer (LinkedIn & Social Icons Support) --- */
footer { 
    background: var(--footer-bg); 
    padding: 40px 0; 
    text-align: center; 
    color: var(--white); 
}

.social-links { 
    margin-top: 20px; 
    display: flex; 
    justify-content: center; 
    gap: 15px; 
}

.social-links a {
    color: white; 
    font-size: 1.1rem; 
    text-decoration: none;
    transition: var(--transition);
    display: inline-flex; 
    align-items: center; 
    justify-content: center;
    background: rgba(255,255,255,0.08); 
    width: 38px; 
    height: 38px;
    border-radius: 50%; 
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.social-links a:hover { 
    transform: translateY(-3px) scale(1.1); 
    background: var(--primary-blue); 
    box-shadow: 0 5px 15px rgba(37,99,235,0.3);
}

/* LinkedIn Specific Color Hover */
.social-links a[title="LinkedIn"]:hover {
    background: #0077b5;
}

/* --- Mobile View Adjustments --- */
@media (max-width: 768px) {
    .menu-icon { 
        display: block !important; 
        font-size: 2.2rem; 
        position: absolute;
        right: 20px; top: 15px;
    }

    .nav-links {
        position: fixed; right: -100%; top: 0; height: 100vh; width: 260px;
        background-color: var(--dark-bg); flex-direction: column; 
        align-items: center; padding-top: 100px; 
        transition: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: -10px 0 20px rgba(0,0,0,0.5);
    }

    .nav-links.active { right: 0; }
    .nav-links li { margin: 15px 0; width: 100%; text-align: center; }
    .nav-links a { font-size: 1.3rem; padding: 10px 30px; }

    .close-icon { 
        display: block !important; 
        position: absolute; top: 25px; right: 25px; 
        font-size: 2.2rem;
    }

    .hero h1 { font-size: 2.4rem; }
}