.problem{
    position: relative;
}
.problem-section{
    width: 100%;
    min-height: calc(100vh - 150px);
    padding-top: 0;
    padding-bottom: 80px;
    background: #f8f8f8;
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow-y: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
}
/* 问题页面样式 */
.problem-container {
    width: 100%;
}

.problem-wrapper {
    width: 1400px;
    margin: 0 auto;
    display: flex;
    overflow: hidden;
}

/* 左侧tab导航 */
.tab-nav {
    width: 200px;
    background: #f9f9f9;
    padding: 40px 0;
}

.tab-item {
    width: 100%;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    margin-bottom: 10px;
}

.tab-item:last-child {
    margin-bottom: 0;
}

.tab-item span {
    font-size: 24px;
    color: #808080;

    z-index: 1;
    transition: color 0.3s ease;
}


.tab-item.active {
    background: url('../images/problem-icon-bg.png') no-repeat center;
    background-size: cover;
}


.tab-item.active span {
    color: #9c825e;
    font-weight: bold;
}

/* 右侧tab内容 */
.tab-content {
    flex: 1;
    padding: 40px 30px;
    min-height: 500px;
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.main-title {
    font-size: 40px;
    color: #000;
    margin-bottom: 20px;
}

.sub-title {
    font-size: 24px;
    color: #000;
    margin-bottom: 20px;
}

.problem-image {
    width: 100%;

    height: auto;
    margin-bottom: 30px;
}

.problem-text {
    color: #000;
    line-height: 1.8;
}

.problem-text p {
    font-size: 16px;
}

.problem-text p:last-child {
    margin-bottom: 0;
}

.back{
    position: absolute;
    bottom:400px;
    right: 180px;
}