body {
    margin: 0;
    font-family: 'SolaimanLipi', Arial, sans-serif;
    background-color: #f0f4f8;
}

.header { background: #0288d1; color: white; padding: 25px; text-align: center; }
.header-center-wrapper { display: flex; align-items: center; justify-content: center; gap: 15px; }
.logo img { width: 70px; height: auto; }

.titles h1 { margin: 0; font-size: 26px; }
.titles h3 { margin: 5px 0 0; font-size: 18px; color: #ffd700; }

.navbar { background: #01579b; text-align: center; padding: 15px; position: sticky; top: 0; z-index: 1000; }
.navbar a { color: white; text-decoration: none; padding: 0 15px; font-weight: bold; }

.main-container {
    max-width: 1100px;
    margin: 40px auto;
    padding: 0 20px;
}

.page-title { text-align: center; margin-bottom: 30px; }

.activities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
}

.activity-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.activity-card:hover { transform: translateY(-10px); }

.activity-img img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-bottom: 3px solid #01579b;
}

.activity-content { padding: 20px; text-align: center; }
.activity-content h3 { color: #01579b; margin: 0 0 10px 0; font-size: 22px; }
.activity-content p { color: #555; font-size: 15px; line-height: 1.6; }

.footer {
    background: #01579b;
    color: white;
    text-align: center;
    padding: 20px;
    margin-top: 50px;
}

@media (max-width: 600px) {
    .header-center-wrapper { flex-direction: column; }
    /* মোবাইলে বাটন মাঝখানে থাকবে */
    div[style*="justify-content: flex-end"] { justify-content: center !important; }
}