* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    line-height: 1.5;
    background-color: #fff;
    /* 关键修改1：去掉100vw，改用100%，避免滚动条宽度冲突 */
    width: 100%;
    /* 兜底：禁止横向滚动（优先解决溢出根源，此为辅助） */
    overflow-x: hidden;
    font-family: Microsoft YaHei;
}

a {
    text-decoration: none;
}

li {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    vertical-align: middle;
    border: none;
}

.center {
    background: #F7F7F7;
}

.title {
    height: 50px;
    background-color: #fff;
    margin: 10px 0px;
    display: flex;
    align-items: center;
    margin-left: 360px;
}

.log {
    display: flex;
    align-items: center;
}

.log img {
    width: 42px;
    height: 42px;
    vertical-align: middle;
    margin-right: 10px;
}

.title span {
    font-weight: 700;
    font-style: Bold;
    font-size: 32px;
    line-height: 100%;
    color: #F57B00;
    vertical-align: middle;
}

.c_top {
    height: 1008px;
    background-image: url("./img/bg.png");
    position: relative;
    width: 100%;
    background-size: cover;
    background-position: center;
}

.c_t_left {
    position: absolute;
    width: 290px;
    height: 449px;
    top: 30%;
    left: 25%;
    gap: 20px;
}

.c_t_left p {
    font-weight: 700;
    font-size: 40px;
    font-style: Bold;
    line-height: 100%;
    letter-spacing: 0px;
    text-align: center;
    color: #FFFFFF;
}

.c_t_left img {
    border-radius: 20px;
    width: 240px;
    height: 240px;
    text-align: center;
    margin-top: 20px;
    margin-left: 25px;
}

.c_t_right {
    position: absolute;
    width: 380px;
    height: 765px;
    opacity: 1;
    top: 8%;
    left: 56%;
}

.c_center {
    margin: 30px 0px;
    position: relative;
    width: 1200px;
    height: 627px;
    justify-content: space-between;
    opacity: 1;
    left: 360px;
    border-radius: 40px;
    padding-top: 72px;
    padding-right: 72px;
    padding-bottom: 72px;
    padding-left: 120px;
    display: flex;
}

.c_c_left {
    width: 219px;
    height: 440px;

    opacity: 1;

}

.c_c_right {
    width: 707px;
    height: 483px;
    opacity: 1;
    gap: 12px;
    margin-top: 30px;
}

.guide_t {
    width: 650px
}

.guide_t h3 {
    font-weight: 700;
    font-style: Bold;
    font-size: 40px;
    color: #FC773E;
}

.guide_t p {
    font-weight: 400;
    font-size: 18px;
    margin-top: 20px;
}

.guide_b {
    width: 672px;
    margin-top: 60px;
}

.guide_b h3 {
    font-weight: 700;
    font-style: Bold;
    font-size: 40px;
    color: #FC773E;
}

.guide_b p {
    font-weight: 400;
    font-size: 18px;
    margin-top: 20px;
}

.c_bottom {
    width: 100%;
    height: 584px;
    display: flex;
    justify-content: space-between;
    opacity: 1;
    top: 1828px;
    border-radius: 20px;
    padding-top: 72px;
    padding-right: 360px;
    padding-bottom: 72px;
    padding-left: 360px;
    background: #FFFFFF;
}

.c_b_left {
    width: 544px;
    height: 383px;
    opacity: 1;
    gap: 48px;

}

.step_t h3 {
    font-weight: 700;
    font-style: Bold;
    font-size: 32px;
    line-height: 100%;
    letter-spacing: 0%;
    color: #FC773E;

}

.c_b_left p {
    font-weight: 400;
    font-style: Regular;
    font-size: 18px;
    line-height: 100%;
    letter-spacing: 0%;
    margin-top: 30px;
}

.step_b h3 {
    font-weight: 700;
    font-style: Bold;
    font-size: 32px;
    line-height: 100%;
    letter-spacing: 0%;
    color: #FC773E;

}

.step_b {
    margin-top: 70px;
}

.c_b_right {
    width: 503px;
    height: 440px;
    opacity: 1;
    position: relative;
    margin-left: 100px;
}

.c_b_right img:nth-child(1) {
    width: 190px;
    height: 393px;
    opacity: 1;
    border-radius: 29.32px;
    position: absolute;
}

.c_b_right img:nth-child(2) {
    width: 219px;
    height: 440px;
    opacity: 1;
    position: absolute;
    top: -20px;
    left: 135px;
}

.c_b_right img:nth-child(3) {
    width: 190px;
    height: 393px;
    border-radius: 29.32px;
    position: absolute;
    left: 300px;
}

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: #ffc107;
    color: #fff;
    border-radius: 50%;
    text-align: center;
    line-height: 50px;
    font-size: 20px;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 9999;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

/* 鼠标悬停效果 */
.back-to-top:hover {
    background-color: #ffb300;
    transform: scale(1.05);
    /* 轻微放大 */
}