.tutorial-container {
    font-family: '华文楷体', serif;
    width: 80%;
    margin: 0 auto; /* 关键修改：添加水平居中 */
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 0 15px rgba(0,0,0,0.1);
    text-align: justify;
    margin-top: 8rem;
}

h1 {
    color: #282727;
    font-size: 200%;
    font-weight: bold;
    border-bottom: 2px solid #7e5e4b;
    padding-bottom: 10px;
    margin-bottom: 30px;
}

.step-box {
    margin: 25px 0;
    padding: 20px;
    border-left: 5px solid #634c3e;
    background: #fffaf0;
    position: relative;
}

.step-box p{
    color: #8a643e;
}

.step-number {
    position: absolute;
    left: -30px;
    top: -15px;
    background: #7e5e4b;
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

h2 {
    font-size: 150%;
    color: #3f3f3f;
    margin-top: 0;
    margin-bottom: 15px;
}

.image-placeholder {
    display: flex; /* 父级成为 flex 容器 */
    justify-content: center; /* 主轴居中 */
    margin: 15px 0;
}

.image-placeholder img{
    width: 60%;
    height: auto;
    max-width: 600px;
    border-radius: 5px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    margin: 15px 0;
}

.highlight {
    color: #b22222;
    font-weight: bold;
}

/* 视频居中样式 */
.video video {
    display: block;
    margin: 0 auto;
}