/* ===== 全域 ===== */
body {
    margin: 0;
    font-family: "Microsoft JhengHei", "Noto Sans TC", sans-serif;
    font-size: 16px;
    background-color: #fff8cc;
    text-align: center;
}

/* ===== 標題 ===== */
header {
    background-color: #0099cc;
    color: white;
    padding: 20px;
}

/* ===== 導覽列 ===== */
nav {
    display: flex;
    justify-content: center;
    background-color: #0099cc;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 15px 20px;
    font-size: 22px;
}

nav a:hover {
    background-color: #0077aa;
}

/* ===== 內容 ===== */
main {
    padding: 20px;
}

/* ===== Footer ===== */
footer {
    background-color: #333;
    color: white;
    padding: 10px;
}

/* ⭐ 手機版 */
@media (max-width: 768px) {

    nav {
        flex-direction: column;
    }

    nav a {
        border-top: 1px solid rgba(255,255,255,0.3);
        font-size: 20px;
    }

    body {
        font-size: 18px;
    }
}