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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f2f3f4;
    color: #333;
    line-height: 1.6;
    padding: 10px;
}

header {
    background: #2196F3;
    color: white;
    padding: 20px 10px;
    text-align: center;
}

header h1 {
    margin-bottom: 10px;
}

nav ul.tabs {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

nav ul.tabs li.tab-link {
    cursor: pointer;
    padding: 10px 15px;
    margin: 0 5px;
    background: #1976D2;
    border-radius: 5px 5px 0 0;
    color: white;
    transition: background 0.3s;
}

nav ul.tabs li.tab-link:hover,
nav ul.tabs li.tab-link.active {
    background: #43A047;
}

main {
    background: white;
    max-width: 1000px;
    margin: 20px auto;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(33, 150, 243, 0.3);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.tab-content h2 {
    color: #1976D2;
    margin-bottom: 15px;
}

.tab-content ul {
    list-style: disc;
    margin-left: 20px;
}

.tab-content ul li {
    margin-bottom: 10px;
}

.tab-content ul li a {
    color: #FF9800;
    text-decoration: none;
}

.tab-content ul li a:hover {
    text-decoration: underline;
}

footer {
    text-align: center;
    padding: 15px 10px;
    background: #1976D2;
    color: white;
    margin-top: 20px;
    border-radius: 0 0 8px 8px;
}

/* Responsive */
@media (max-width: 768px) {
    nav ul.tabs {
        flex-direction: column;
        align-items: center;
    }

    nav ul.tabs li.tab-link {
        margin: 5px 0;
        width: 90%;
        text-align: center;
    }
}