body {
    font-family: 'Segoe UI', sans-serif;
    margin: 0;
    background: linear-gradient(to right, #eef2f7, #d9e4f5);
}

header {
    background: linear-gradient(90deg, #0a3d62, #1e5f8a);
    color: white;
    padding: 25px;
    text-align: center;
}

nav {
    background: #ffffff;
    padding: 12px;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

nav a {
    color: #0a3d62;
    margin: 0 15px;
    text-decoration: none;
    font-weight: bold;
}

nav a:hover {
    color: #1e5f8a;
}

.container {
    padding: 40px;
    max-width: 1000px;
    margin: auto;
}

.card {
    background: white;
    padding: 25px;
    margin: 20px 0;
    border-radius: 10px;
    box-shadow: 0px 8px 20px rgba(0,0,0,0.08);
}

footer {
    background: #0a3d62;
    color: white;
    text-align: center;
    padding: 15px;
}

/* Tabs */
.tabs {
    display: flex;
    flex-wrap: wrap;
    margin-bottom: 10px;
}

.tab-button {
    padding: 12px 20px;
    cursor: pointer;
    border: none;
    background: #e0e6ed;
    margin-right: 5px;
    border-radius: 5px 5px 0 0;
    font-weight: bold;
}

.tab-button.active {
    background: #1e5f8a;
    color: white;
}

.tab-content {
    display: none;
    padding: 20px;
    background: white;
    border-radius: 0 10px 10px 10px;
    box-shadow: 0px 5px 15px rgba(0,0,0,0.1);
}

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