/* 主版面：左側選單 + 右側課程內容 */
.lesson-layout { 
    display: flex;
    flex-direction: row;
    gap: 24px;
    max-width: 100%;
    margin-top: 20px;
}

/* 側邊欄樣式 */
.lesson-sidebar {
    width: 220px;
    padding: 20px;
    background-color: #ffe4ec;
    border-radius: 16px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* 側邊欄標題 */
.lesson-sidebar h3 {
    font-size: 20px;
    font-weight: bold;
    color: #d33669;
    margin-bottom: 12px;
}

/* 側邊欄列表 */
.lesson-sidebar ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
}

.lesson-sidebar li {
    margin: 10px 0;
}

/* 側邊欄連結 */
.lesson-sidebar a {
    text-decoration: none;
    color: #d33669;
    font-weight: 600;
    padding: 8px 12px;
    display: block;
    border-radius: 10px;
    transition: background-color 0.3s, color 0.3s;
}

.lesson-sidebar a:hover {
    background-color: #ffcde3;
    color: #fff;
}

/* 右側課程內容 */
.lesson-content {
    flex-grow: 1;
}

/* 課程卡片容器：使用 Grid 兩欄式排列 */
.lesson-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
    padding: 20px;
    max-width: 800px;
    margin: auto;
}

/* 單一課程卡片 */
.lesson-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: #fef4f8;
    border-radius: 16px;
    padding: 20px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
}

.lesson-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.15);
}

/* 課程標題樣式 */
.lesson-container h1 {
    text-align: center; /* 文字置中 */
    margin: 0; /* 去除外邊距 */
    padding-top: 5px; /* 上邊距 */
    font-size: 4rem; /* 字型大小 */
    color: #4DBBC1; /* 顏色 */
    font-weight: bold;
}

/* 圖片容器 */
.lesson-image-container {
    width: 100%;        /* 讓容器寬度可以自適應 */
    max-width: 300px;   /* 最大寬度350px */
    margin-top: 10px;
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    background-color: #fff0f5;
    border: 2px solid #f8c1d6;
    padding: 12px;
    transition: transform 0.3s ease-in-out, box-shadow 0.3s ease-in-out;
}


.lesson-image-container img {
    width: 100%;
    max-width: 300px;  /* 最大寬度300 */
    height: auto;
    border-radius: 12px;
    display: block;
    margin: 0 auto;  /* 水平置中 */
}


.lesson-image-container:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* 課程影片容器 */
.lesson-video-container {
    width: 80%;
    max-width: 600px;
    margin-top: 20px;
}

/* 影片元素樣式 */
video {
    width: 80%;
    height: auto;
    max-height: 80vh;
    border-radius: 12px;
    display: block;
    margin: 0 auto;
}

/* 搜尋表單樣式 */
.search-form {
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

/* 搜尋輸入框 */
.search-form input[type="text"] {
    width: 100%;
    height: 42px;
    font-size: 16px;
    padding: 8px 12px;
    border-radius: 10px;
    border: 1px solid #ccc;
    box-sizing: border-box;
    outline: none;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.search-form input[type="text"]:focus {
    border-color: #f397af;
    box-shadow: 0 0 5px rgba(243, 151, 175, 0.5);
}

/* 搜尋按鈕 */
.search-form button {
    width: 100%;
    height: 42px;
    background-color: #d33669;
    color: white;
    font-size: 16px;
    font-weight: bold;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
}

.search-form button:hover {
    background-color: #b92c58;
    transform: scale(1.02);
}

/* 圖片容器 */
.lesson-image-container {
    width: 100%;           /* 寬度自適應卡片 */
    max-width: 300px;      /* 卡片最大寬度 */
    margin-top: 10px;
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    background-color: #fff0f5;
    border: 2px solid #f8c1d6;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: transform 0.3s ease-in-out, box-shadow 0.3s ease-in-out;
}

/* 圖片樣式 */
.lesson-image-container img {
    width: 100%;           /* 寬度填滿容器 */
    height: auto;          /* 高度自動，保持比例 */
    display: block;
}