body {
    font-family: 'Segoe UI', Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f5f7fa;
    color: #333;
}
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #0078d7;
    color: #fff;
    padding: 10px 20px;
}
.menu {
    display: flex;
    gap: 20px;
}
.menu a {
    color: white;
    text-decoration: none;
    padding: 8px 12px;
    transition: background 0.3s ease;
}
.menu a:hover, .menu a.active {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
}
.menu-toggle {
    display: none;
    font-size: 24px;
    background: none;
    border: none;
    color: white;
}
.content {
    text-align: center;
    padding: 20px;
}
.round-image {
    width: 180px;
    height: 180px;
    object-fit: cover;
    border-radius: 50%;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    margin-bottom: 10px;
}
.btn {
    background: #0078d7;
    color: white;
    padding: 10px 20px;
    border: none;
    cursor: pointer;
    border-radius: 6px;
}
.btn:hover {
    background: #005bb5;
}
.table-container {
    overflow-x: auto;
}
table {
    width: 100%;
    border-collapse: collapse;
}
table, th, td {
    border: 1px solid #ccc;
}
th, td {
    padding: 10px;
    text-align: left;
}
.certificates-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}
.certificate-item {
    text-align: center;
    background: #fff;
    padding: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    border-radius: 6px;
}
.certificate-item img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
}

/* Mobile view */
@media (max-width: 768px) {
    .menu {
        flex-direction: column;
        position: absolute;
        top: 60px;
        right: 0;
        background: #0078d7;
        width: 200px;
        transform: translateX(100%);
        transition: transform 0.3s ease;
    }
    .menu.active {
        transform: translateX(0);
    }
    .menu-toggle {
        display: block;
    }
}