/* 全域字型與背景 */
html, body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f7f9;
    color: #333;
}

/* 導覽列 */
.top {
    background-color: #00aaff;
    padding: 1rem 2rem;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

.top nav {
    display: flex;
    justify-content: center;
    gap: 2rem;
}

.top a {
    color: white;
    text-decoration: none;
    font-weight: bold;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: background-color 0.3s;
}

.top a:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

/* 主內容 */
.Index {
    max-width: 800px;
    margin: 80px auto;
    text-align: center;
    padding: 2rem;
    background-color: white;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.Index h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.Index .highlight {
    color: #00aaff;
}

.Index p {
    font-size: 1.25rem;
    color: #555;
}