body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f4f7fa;
    color: #222;
}

header {
    background: #0077c2;
    color: white;
    padding: 15px;
    text-align: center;
}

nav a {
    margin: 0 10px;
    color: white;
    text-decoration: none;
    font-weight: bold;
}

.container {
    width: 90%;
    max-width: 800px;
    margin: 30px auto;
    background: white;
    padding: 20px;
    border-radius: 8px;
}

.tips li, .session ul li {
    margin: 8px 0;
}

.session {
    margin-bottom: 20px;
}

form label {
    display: block;
    margin: 10px 0;
}

input {
    width: 100%;
    padding: 8px;
    margin-top: 5px;
}

button {
    padding: 10px 15px;
    background: #0077c2;
    color: white;
    border: none;
    cursor: pointer;
    border-radius: 4px;
}

button:hover {
    opacity: 0.9;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

th, td {
    border: 1px solid #ccc;
    padding: 8px;
    text-align: center;
}

footer {
    text-align: center;
    margin: 40px 0 20px;
    color: #555;
}