html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: Arial, "Microsoft JhengHei", sans-serif;
    background: skyblue;
    color: #111;
}

/* 左側選單 */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 220px;
    height: 100vh;
    background: #ffffffcc;
    padding: 30px 20px;
    box-sizing: border-box;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.15);
}

    .sidebar h2 {
        margin-top: 0;
        margin-bottom: 25px;
        border-left: none;
        padding-left: 0;
        color: #111;
    }

    .sidebar nav {
        display: flex;
        flex-direction: column;
        gap: 12px;
    }

    .sidebar a {
        color: #111;
        text-decoration: none;
        font-weight: bold;
        padding: 10px 12px;
        border-radius: 8px;
    }

        .sidebar a:hover {
            background: #ff8c00;
            color: #111;
        }

/* 右側內容 */
.content {
    max-width: 900px;
    margin-left: 260px;
    padding: 40px 30px;
}

section {
    margin-bottom: 60px;
    scroll-margin-top: 30px;
}

h1 {
    font-size: 48px;
    margin-bottom: 20px;
}

h2 {
    margin-top: 40px;
    border-left: 5px solid #ff8c00;
    padding-left: 12px;
}

p {
    line-height: 1.8;
}

ul {
    line-height: 1.8;
}

img {
    max-width: 100%;
    margin: 12px 0;
    border-radius: 8px;
    display: block;
}

.video-box {
    position: relative;
    width: 100%;
    max-width: 900px;
    aspect-ratio: 16 / 9;
    margin: 20px 0;
}

    .video-box iframe {
        width: 100%;
        height: 100%;
        border: 0;
        border-radius: 8px;
    }

.download-button {
    display: inline-block;
    padding: 14px 24px;
    background: #ff8c00;
    color: #111;
    text-decoration: none;
    font-weight: bold;
    border-radius: 8px;
    margin-top: 10px;
}

    .download-button:hover {
        background: #ffaa33;
    }

/* 手機或小螢幕時，選單改到上方 */
@media (max-width: 768px) {
    .sidebar {
        position: static;
        width: 100%;
        height: auto;
        box-shadow: none;
    }

        .sidebar nav {
            flex-direction: row;
            flex-wrap: wrap;
            gap: 8px;
        }

        .sidebar a {
            background: #ffffffaa;
        }

    .content {
        margin-left: 0;
        padding: 30px 20px;
    }

    h1 {
        font-size: 38px;
    }
}