/* 顶部导航 */
.header {
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 480px;
    background-color: #fff;
    border-bottom: 1px solid #e5e5e5;
    border-top: none;
    z-index: 100;
    height: 56px;
}

.header-content {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 0 16px;
}

.back-btn {
    position: absolute;
    left: 16px;
    background: none;
    border: none;
    color: #d4af37;
    cursor: pointer;
    padding: 8px;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.back-btn:hover {
    background-color: #f5f5f5;
}

.header-title {
    font-size: 18px;
    font-weight: 600;
    color: #d4af37;
    text-align: center;
}

/* 底部导航 */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 480px;
    height: 60px;
    background-color: #fff;
    border-top: 1px solid #e5e5e5;
    display: flex;
    justify-content: space-around;
    align-items: center;
    z-index: 100;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    height: 100%;
    cursor: pointer;
    transition: color 0.2s;
    color: #999;
    padding: 8px 4px;
}

.nav-item.active {
    color: #d4af37;
}

.nav-item:hover {
    background-color: #f9f9f9;
}

.nav-icon {
    font-size: 20px;
    margin-bottom: 2px;
}

.nav-text {
    font-size: 10px;
    line-height: 1;
    text-align: center;
}

/* 小屏幕适配 */
@media (max-width: 360px) {
    .header-title {
        font-size: 16px;
    }
    
    .nav-text {
        font-size: 9px;
    }
    
    .nav-icon {
        font-size: 18px;
    }
    
    .bottom-nav {
        height: 55px;
    }
}