/* বেসিক রিসেট */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f4f7f6;
    color: #333;
    line-height: 1.6;
}

/* নেভিগেশন বার */
header {
    background: #2c3e50;
    color: #fff;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1100px;
    margin: auto;
    padding: 0 20px;
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 20px;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
}

nav ul li a:hover {
    color: #1abc9c;
}

/* হিরো সেকশন */
.hero {
    background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('https://images.unsplash.com/photo-1506126613408-eca07ce68773?ixlib=rb-1.2.1&auto=format&fit=crop&w=1350&q=80');
    background-size: cover;
    background-position: center;
    height: 300px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: white;
    text-align: center;
}

/* কন্টেইনার এবং কার্ড */
.container {
    max-width: 1100px;
    margin: 2rem auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    padding: 0 20px;
}

.card {
    background: #fff;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
}

.card h2 {
    color: #2c3e50;
    margin-bottom: 1rem;
    border-bottom: 2px solid #1abc9c;
    display: inline-block;
}

/* ফুটার */
footer {
    text-align: center;
    padding: 2rem;
    background: #2c3e50;
    color: white;
    margin-top: 2rem;
}

/* মোবাইল রেসপনসিভ */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
    }
    nav ul {
        margin-top: 10px;
    }
}